Integrated roll-molding mold for septic tank and integrated roll-molding manufacturing process thereof

Abstract

The present application relates to the technical field of rotational molding, in particular to an integrated rotational molding mold for a septic tank and an integrated molding manufacturing process thereof, characterized in that: the mold comprises an upper mold and a lower mold which are assembled in sequence from top to bottom, a rotational molding cavity is formed between the upper mold and the lower mold, and the two are locked and fixed by a mold closing bolt assembly, two intervally arranged partition nets are arranged in the rotational molding cavity, and the rotational molding cavity is divided into three chambers, the upper part of the partition net is provided with a through hole, the inner sides of the two partition nets are fixedly connected by a connecting rod mechanism, and the outer sides of the two partition nets are both provided with a ejector rod mechanism, which is arranged on the upper mold and used for positioning and fixing the partition net. The septic tank with a partition plate is directly integrally molded, which is beneficial to reducing the overall production energy consumption and labor cost, and makes the overall manufacturing of the septic tank relatively time-saving and labor-saving, and is also beneficial to improving the overall structural strength and pressure resistance, and effectively ensuring the overall sealing performance.

Description

Technical Field

[0001] This invention relates to the field of rotational molding technology, specifically to an integral rotational molding mold for septic tanks and its integral molding manufacturing process. Background Technology

[0002] A septic tank is a primary treatment structure that uses sedimentation and anaerobic fermentation to remove suspended organic matter from domestic sewage. It contains a sedimentation chamber, a filtration chamber, and a clarification chamber. Domestic sewage enters the sedimentation chamber through the inlet pipe, settles, then enters the filtration chamber for filtration, and finally enters the clarification chamber to be purified into clean water before being discharged through the drain pipe. Existing plastic septic tanks are typically manufactured in a split-type configuration, where the outer shell and partitions are separately formed using a rotational molding process. The two partitions are then welded to the outer shell using a hot-melt gun, thus creating the sedimentation, filtration, and clarification chambers within the septic tank. However, split-type plastic septic tanks have the following drawbacks: Disadvantages: 1. Since the outer shell and partitions of the septic tank need to be manufactured separately by rotational molding, the overall production energy consumption is relatively high, which increases the overall production cost of the septic tank; 2. Since the partitions need to be welded to the outer shell manually, the overall labor cost is increased. Moreover, during welding, workers need to crawl into the confined space of the outer shell to weld, which is inconvenient, time-consuming and labor-intensive; 3. Welding the partitions inside the outer shell also requires relatively high welding skills from the workers. If there are welding quality problems, it will affect the sealing between the partitions and the outer shell, and leakage problems will easily occur between the various chambers in the septic tank during use. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a septic tank with a partition through direct one-piece molding, which is conducive to reducing the overall production energy consumption and labor costs, and makes the overall production of the septic tank relatively time-saving and labor-saving. It is also conducive to improving the overall structural strength and compressive strength, and effectively ensuring the overall sealing performance. This invention provides a one-piece rotational molding mold and its one-piece molding process for septic tanks.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an integrally molded rotational molding mold for septic tanks, comprising an upper mold and a lower mold assembled sequentially, wherein the upper mold and the lower mold together form a rotational molding cavity and are locked and fixed together by a mold clamping bolt assembly, wherein two spaced partitions are provided in the rotational molding cavity, dividing the rotational molding cavity into three chambers, wherein the upper part of the partitions is provided with through holes, and the inner sides of the two partitions are fixedly connected by a linkage mechanism, wherein the outer sides of the two partitions are provided with a push rod mechanism, the push rod mechanism being provided on the upper mold and used to position and fix the partitions.

[0005] Furthermore, the linkage mechanism includes multiple links, which are evenly spaced along the circumference of the mesh, and the two ends of the links are fixedly connected to the mesh on the corresponding side.

[0006] Furthermore, the push rod mechanism includes an L-shaped push rod, one end of which abuts against the outside of the partition mesh and a snap-fit ​​assembly is provided between them, and the other end of the push rod is locked and fixed to the vent hole of the upper mold by a locking assembly.

[0007] Furthermore, the snap-fit ​​assembly includes a snap-fit ​​block and a snap-fit ​​groove. The snap-fit ​​block is cross-shaped and fixedly mounted on one end of the push rod. The snap-fit ​​groove is adapted to the snap-fit ​​block and is mounted on a fixed block. The fixed block is fixedly mounted at the center of the outer surface of the mesh. The snap-fit ​​block can be detachably snapped into the snap-fit ​​groove. The locking assembly includes two locking nuts and two locking plates. The outer surface of the other end of the push rod is provided with an external thread section. The two locking plates are respectively located on the inner and outer sides of the vent hole of the upper mold. The locking plates are provided with annular protrusions adapted to the vent hole. The annular protrusions are embedded in the vent hole. The center of the locking plate is provided with a circular hole through which the push rod can pass. The locking plate is also provided with multiple vents. The two locking nuts are threadedly connected to the external thread section and are respectively located on the outer side of the two locking plates.

[0008] Furthermore, the push rod includes an L-shaped first rod and a straight second rod. A tightening fine-tuning assembly is provided between the second rod and the first rod. The tightening fine-tuning assembly includes an adjusting screw and an adjusting nut. The adjusting nut is fixedly sleeved in the middle of the adjusting screw. A first threaded hole is provided in one end of the first rod, and a second threaded hole is provided in one end of the second rod. One end of the adjusting screw is threaded into the first threaded hole, and the other end is threaded into the second threaded hole. The threads at both ends of the adjusting screw have opposite directions of rotation.

[0009] Furthermore, the mesh size of the separator is 5-10mm.

[0010] Furthermore, a reinforcing structural component is fixedly provided on one side surface of the mesh. The reinforcing structural component includes a central plate, an inner ring plate, and an outer ring plate arranged sequentially from the inside to the outside. The central plate, the inner ring plate, and the outer ring plate are fixedly connected by multiple strip plates, which are evenly spaced along the circumference of the central plate.

[0011] Furthermore, a gap is provided between the outer circumferential surface of the partition mesh and the inner circumferential surface of the rotational molding cavity, and an annular plastic block adapted to the gap is fixed on the outer circumferential surface of the partition mesh.

[0012] Furthermore, the upper mold has an upper annular groove, and the lower mold has a lower annular groove. The upper annular groove of the upper mold can be closed with the lower annular groove of the lower mold to form an annular groove. The four edges of the partition mesh extend into the annular groove, and the edges of both sides of the partition mesh are fitted with the annular groove with a gap.

[0013] The one-piece molding manufacturing process of septic tanks utilizes any of the above-mentioned one-piece rotational molding molds for septic tanks, and includes the following process steps:

[0014] Step 1: Prepare plastic raw materials;

[0015] Step 2: Apply release agent to the inner walls of the upper and lower molds;

[0016] Step 3: Fix the two meshes together using a linkage mechanism, then place the fixed meshes into the upper mold and position and fix them using two push rod mechanisms;

[0017] Step 4: Load the plastic raw material into the lower mold according to the required weight, and then assemble the upper mold with the partition net into the lower mold using the mold clamping bolt assembly to form a rotational molding mold.

[0018] Step 5: Install the rotational molding mold on the rotational molding machine and send it into the burner for heating and firing. During the heating and firing process, the rotational molding machine will drive the rotational molding mold to rotate, so that the plastic raw material in the rotational molding mold will gradually melt and adhere to the inner wall of the rotational molding mold and the two sides of the mesh under the action of gravity and heat.

[0019] Step 6: Remove the rotational molding mold and rotational molding machine from the burner and stop heating. Continue to rotate the rotational molding mold through the rotational molding machine to cool and shape it.

[0020] Step 7: After cooling and molding, stop the rotation of the rotational molding machine and remove the rotational molding mold from the machine. Then, disassemble and separate the rotational molding mold, and demold the septic tank with partitions after rotational molding.

[0021] Step 8: Drill inspection holes in the septic tank and remove the top rod mechanism from the septic tank.

[0022] As described above, the integrated rotational molding mold for septic tanks and its integrated molding process provided by this invention, through the setting of the linkage mechanism, facilitate the fixed connection of two mesh screens into a whole, and can provide good support for the inner sides of the two mesh screens. Simultaneously, with the use of the top rod mechanism, the mesh screens can be well supported from the outside, thereby providing good positioning and fixing of the mesh screens, ensuring that the two mesh screens are stably placed within the rotational molding cavity, and effectively ensuring the stability of the mesh screen installation position during the rotational molding process. Thus, during the rotational molding process, the molten plastic raw material adheres to and coats the inner walls of the upper and lower molds simultaneously... It also adheres to and wraps around the mesh, allowing for the direct one-piece molding of a septic tank with partitions. This eliminates the need for separate rotational molding of the outer shell and partitions, reducing overall production energy consumption and costs. Furthermore, the elimination of partition welding reduces labor costs, making the overall production of the septic tank more time- and labor-saving. In addition, the one-piece molding of the septic tank with partitions improves overall structural strength and compressive resistance, effectively ensuring the seal between the partitions and the outer shell. This prevents leakage between the various chambers during use, effectively guaranteeing the quality of the finished septic tank. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the internal structure of the integrally molded rotational molding die for septic tanks according to the present invention.

[0024] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0025] Figure 3 for Figure 1 A magnified view of a portion of point B in the middle.

[0026] Figure 4 for Figure 1 A magnified view of a portion of point C.

[0027] Figure 5 for Figure 1 A magnified view of a portion of point D.

[0028] Figure 6 This is a three-dimensional structural diagram of the integral molding rotational molding die for septic tanks according to the present invention.

[0029] Figure 7 This is a three-dimensional exploded view of the push rod mechanism.

[0030] Figure 8 for Figure 7 A magnified view of a portion of point E in the middle.

[0031] Figure 9 for Figure 7 A magnified view of a portion of point F in the middle.

[0032] Figure 10 A three-dimensional structural diagram showing the connection between the partition net, reinforcing structural components, and ring-shaped plastic block.

[0033] Figure 11 This invention relates to an integrally molded septic tank manufactured using an integrally molded rotational molding die for septic tanks.

[0034] In the diagram: 1-Upper mold; 11-Upper annular groove; 12-Ventilation hole; 2-Lower mold; 21-Lower annular groove; 3-Mold closing bolt assembly; 4-Rotomolding cavity; 5-Partition mesh; 51-Through hole; 52-Annular plastic block; 6-Linkage mechanism; 61-Linkage rod; 62-Fixing nut; 7-Push rod mechanism; 71-Push rod; 711-First rod body; 7111-External threaded section; 7112-First threaded hole; 712-Second rod body; 7121-Second threaded hole; 713-Tightening fine adjustment Components; 7131-Adjusting screw; 7132-Adjusting nut; 72-Snap-fit ​​assembly; 721-Snap block; 722-Snap groove; 73-Locking assembly; 731-Locking nut; 732-Locking plate; 7321-Annular protrusion; 7322-Round hole; 7323-Ventilation port; 74-Fixing block; 8-Reinforcing structural component; 81-Center plate; 82-Inner ring plate; 83-Outer ring plate; 84-Strip plate; 9-Septic tank; 91-Baffle plate; 911-Overflow hole; 92-Inspection hole. Detailed Implementation

[0035] The present invention will be further described below through specific embodiments.

[0036] like Figures 1 to 11 As shown, the integral molding rotational molding mold for septic tanks of the present invention includes an upper mold 1 and a lower mold 2 assembled sequentially. The upper mold 1 and the lower mold 2 together form a rotational molding cavity 4, and the two are locked and fixed by a mold clamping bolt assembly 3. The rotational molding cavity 4 is provided with two spaced partitions 5, which divide the rotational molding cavity 4 into three chambers. The upper part of the partition 5 is provided with a through hole 51. The inner sides of the two partitions 5 are fixedly connected by a connecting rod mechanism 6. The outer sides of the two partitions 5 are provided with a top rod mechanism 7. The top rod mechanism 7 is provided on the upper mold 1 and is used to position and fix the partitions 5.

[0037] The linkage mechanism 6 facilitates the fixed connection of the two partitions 5 into a whole, providing excellent support for the inner sides of the two partitions 5. Simultaneously, in conjunction with the push rod mechanism 7, it effectively supports the partitions 5 from the outside, thus providing good positioning and fixation. This ensures the two partitions 5 remain stably within the rotational molding cavity 4, effectively guaranteeing the stability of their installation position during the rotational molding process. Consequently, during rotational molding, the molten plastic material adheres to and wraps around the inner walls of the upper mold 1 and the lower mold 2, while also adhering to and wrapping around the partitions 5. This allows for the direct one-piece molding of the septic tank 9 with partition 91, eliminating the need for separate rotational molding of the outer shell and partition 91 of the septic tank 9. This reduces overall production energy consumption and costs. Furthermore, the elimination of welding of the partition 91 reduces labor costs and makes the overall production of the septic tank 9 more time- and labor-saving. In addition, the one-piece molding of the septic tank 9 with partition 91 improves the overall structural strength and compressive strength, and effectively ensures the sealing between the partition 91 and the outer shell. As a result, leakage is less likely to occur between the various chambers of the septic tank 9 during use, effectively ensuring the quality of the finished product.

[0038] Preferably, the partition 5 is made of steel wire mesh, and the shape of the partition 5 can be made according to the actual shape of the rotational molding mold, such as a round shape or a square shape.

[0039] like Figure 1 and Figure 3 As shown, specifically, the linkage mechanism 6 includes multiple connecting rods 61, which are evenly spaced along the circumference of the partition 5. The two ends of each connecting rod 61 are fixedly connected to the corresponding side of the partition 5. Correspondingly, each connecting rod 61 can be a fixing screw, with two fixing nuts 62 threaded to both ends. The end of the fixing screw passes through a fixing hole on the partition 5, and the two fixing nuts 62 are located on opposite sides of the partition 5. This facilitates the fixed connection between the connecting rod 61 and the partition 5, while also providing good support for the inner sides of the two partitions 5. Preferably, the number of connecting rods 61 is 3-5. Furthermore, in other embodiments, the connecting rods 61 can be fixedly connected to the partition 5 by welding.

[0040] like Figure 1 , Figure 2 and Figure 3As shown, specifically, the push rod mechanism 7 includes an L-shaped push rod 71. One end of the push rod 71 abuts against the outside of the partition net 5, and a snap-fit ​​assembly 72 is provided between the two. The other end of the push rod 71 is locked and fixed to the vent hole 12 of the upper mold 1 by a locking assembly 73. By adopting this method, the locking assembly 73 can lock and fix the push rod 71 well to the upper mold 1, effectively ensuring the stability of the installation position of the push rod 71. At the same time, through the setting of the snap-fit ​​assembly 72, while the push rod 71 abuts against the outside of the partition net 5, the partition net 5 is also stably hung on the push rod 71. The push rod 71 can play a good role in positioning and fixing the partition net 5 from the outside. In conjunction with the setting of the connecting rod mechanism 6, the two partition nets 5 can be stably placed in the rotational molding cavity 4. In addition, through the setting of the snap-fit ​​assembly 72, it is also convenient to separate the push rod 71 from the partition net 5 when it is necessary to disassemble the push rod 71 later.

[0041] like Figure 3 and Figure 9 As shown, specifically, the snap-fit ​​assembly 72 includes a snap-fit ​​block 721 and a snap-fit ​​groove 722. The snap-fit ​​block 721 is cross-shaped and fixedly mounted on one end of the push rod 71. The snap-fit ​​groove 722 is adapted to the snap-fit ​​block 721 and is mounted on a fixing block 74. The fixing block 74 is fixedly mounted at the center of the outer surface of the partition net 5. The snap-fit ​​block 721 can be detachably snapped into the snap-fit ​​groove 722. This facilitates quick snap-fitting and separation between the push rod 71 and the partition net 5. When one end of each of the two push rods 71 ​​presses against the outer side of the two partition nets 5, the two partition nets 5 can be stably hung between the two push rods 71. During the rotational molding process, the partition net 5 will not rotate relative to the rotational molding mold in the rotational molding cavity 4. This provides good positioning and fixing for the outer side of the partition net 5, and prevents the partition net 5 from contacting the inner walls of the upper mold 1 and the lower mold 2, allowing it to be stably positioned in the rotational molding cavity 4.

[0042] like Figure 2 , Figure 7 and Figure 8As shown, specifically, the locking assembly 73 includes two locking nuts 731 and two locking plates 732. The outer surface of the other end of the push rod 71 is provided with an external thread section 7111. The two locking plates 732 are respectively located on the inner and outer sides of the vent hole 12 of the upper mold 1. Each locking plate 732 has an annular protrusion 7321 adapted to the vent hole 12, which is embedded within the vent hole 12. The locking plate 732 has a central hole 7322 through which the push rod 71 can pass. The locking plate 732 also has multiple vents 7323. The two locking nuts 731 are threaded... The threads are connected to the external thread section 7111 and are respectively located on the outside of the two locking plates 732. Preferably, there are 2-4 vents 7323. By tightening the two locking nuts 731, the push rod 71 can be locked and fixed to the upper mold 1. At the same time, the vents 7323 on the locking plates 732 can ensure the unobstructed flow of the vent holes 12. By making the annular protrusion 7321 embedded in the vent holes 12, the stability of the installation position of the locking plates 732 is effectively ensured, thereby further ensuring the stability of the installation position of the push rod 71.

[0043] like Figure 3 , Figure 7 and Figure 9 As shown, specifically, the push rod 71 includes an L-shaped first rod body 711 and a straight second rod body 712. A tightening fine-tuning assembly 713 is provided between the second rod body 712 and the first rod body 711. The tightening fine-tuning assembly 713 includes an adjusting screw 7131 and an adjusting nut 7132. The adjusting nut 7132 is fixedly sleeved on the middle of the adjusting screw 7131. A first threaded hole 7112 is provided in one end of the first rod body 711, and a second threaded hole 7121 is provided in one end of the second rod body 712. One end of the adjusting screw 7131 is threadedly connected to the first rod body 711. One end of the adjusting screw 7131 is threaded into the second threaded hole 7121, and the other end is threaded into the second threaded hole 7121. The threads at both ends of the adjusting screw 7131 turn in opposite directions. This allows the adjusting nut 7132 to be easily turned with a wrench, thereby rotating the adjusting screw 7131 to adjust the distance between the second rod 712 and the first rod 711. This facilitates the two push rods 71 ​​to more stably support the two spacers 5 from the outside of the two spacers 5. It also facilitates fine-tuning the installation position of the two spacers 5 in the rotational molding cavity 4, making the installation of the spacers 5 more accurate.

[0044] Preferably, the mesh size of the spacer 5 is 5-10 mm. This mesh size allows the molten plastic material to flow freely between the three chambers during the early stages of rotational molding, facilitating a more uniform distribution of the molten plastic material on the inner wall of the rotational molding cavity 4 and on both sides of the spacer 5. Furthermore, during the middle and later stages of rotational molding, as the molten plastic material gradually adheres, the mesh size of the spacer 5 decreases until it eventually covers the mesh size, thus... The mesh 5 forms a partition 91 under the adhesion and encapsulation of the molten plastic material. Furthermore, the diameter of the through hole 51 is 100-150mm. Since the diameter of the through hole 51 is set relatively large, the molten plastic material will flow directly through the through hole 51 and will not be able to encapsulate the through hole 51. Thus, after the mesh 5 forms the partition 91 under the adhesion and encapsulation of the molten plastic material, an overflow hole 911 can be formed at the through hole 51, so that the overflow hole 911 does not need to be processed separately on the partition 91 later.

[0045] like Figure 10 As shown, in addition, a reinforcing structural member 8 is fixedly provided on one side surface of the partition 5. The reinforcing structural member 8 includes a central plate 81, an inner ring plate 82, and an outer ring plate 83 arranged sequentially from the inside to the outside. The central plate 81, the inner ring plate 82, and the outer ring plate 83 are fixedly connected by a plurality of strip plates 84. The plurality of strip plates 84 are evenly spaced along the circumference of the central plate 81. Preferably, the number of strip plates 84 is 3-5. By adopting this structure, the overall structural strength of the partition 5 can be further strengthened. When the molten plastic raw material adheres to the partition 5 and increases the weight of the partition 5, the bending phenomenon of the partition 5 during the rotational molding process is further effectively avoided, thereby better ensuring the finished quality of the septic tank 9 after molding.

[0046] like Figure 4 and Figure 5As shown, a gap is provided between the outer peripheral surface of the partition mesh 5 and the inner peripheral surface of the rotational molding cavity 4. Preferably, the gap is 2-3 mm. This ensures that after the septic tank 9 is formed, the outer peripheral surface of the partition mesh 5 will not be exposed on the outer surface of the septic tank 9, which helps to improve the overall structural strength and finished product quality. In addition, an annular plastic block 52 that matches the gap is fixed on the outer peripheral surface of the partition mesh 5. Preferably, the material of the annular plastic block 52 is LLDPE. This allows the annular plastic block 52 to be installed during the installation of the partition mesh 5. The material block 52 can abut against the gap, which is conducive to the quick and accurate installation of the partition 5 in the rotational molding mold, and effectively ensures that the central axis of the partition 5 coincides with the central axis of the rotational molding cavity 4 after installation, and maintains the consistency of the distance between the outer peripheral surface of the partition 5 and the inner wall of the rotational molding mold. This can further ensure the finished quality of the septic tank 9. In addition, during the rotational molding process, the annular plastic block 52 will be heated and melted together with the added plastic raw materials, which can ensure the integral molding of the outer shell of the septic tank 9 at the gap after rotational molding.

[0047] like Figure 4 and Figure 5 As shown, the upper mold 1 has an upper annular groove 11, and the lower mold 2 has a lower annular groove 21. The upper annular groove 11 of the upper mold 1 and the lower annular groove 21 of the lower mold 2 can surround each other to form an annular groove. The four peripheral edges of the partition mesh 5 extend into the annular groove, and the edges of both sides of the partition mesh 5 are in clearance fit with the annular groove. The annular groove facilitates the quick and accurate installation of the partition mesh 5, further ensuring the stability of the installation position of the partition mesh 5 in the rotational molding cavity 4. It can provide auxiliary limiting and support for the four perimeters of the partition 5, and also provide some auxiliary reinforcement to the structural strength of the partition 5. Thus, during the rotational molding process, when the molten plastic material adheres to the partition 5 and increases the weight of the partition 5, it can further effectively prevent the partition 5 from bending during the rotational molding process. In addition, after the septic tank 9 is formed, it is beneficial to improve the connection strength between the four perimeters of the partition 91 of the septic tank 9 and the outer shell of the septic tank 9, thereby further improving the overall structural strength of the septic tank 9.

[0048] The one-piece molding manufacturing process of the septic tank, using any one of the above-mentioned one-piece rotational molding molds for the septic tank 9, includes the following process steps:

[0049] Step 1: Prepare plastic raw materials. Preferably, LLDPE can be used as the material for the plastic raw materials.

[0050] Step 2: Apply a release agent to the inner walls of the upper mold 1 and the lower mold 2 to facilitate the demolding of the septic tank 9 after it is formed. Preferably, the release agent can be methyl silicone oil release agent.

[0051] Step 3: The two partition nets 5 are fixedly connected via a connecting rod mechanism 6. The two fixedly connected partition nets 5 are then placed into the upper mold 1 and positioned and fixed using two push rod mechanisms 7. Correspondingly, a reinforcing structural member 8 is fixedly provided on one side surface of the partition net 5, and an annular plastic block 52 is fixedly fitted onto the outer circumference of the partition net 5. Specifically, both ends of the connecting rod 61 can pass through the fixing holes on the two partition nets 5 respectively, and the partition nets 5 are locked and fixed by fixing nuts 62 located on both sides of the partition nets 5, thereby allowing the two ends of the connecting rod 61 to respectively engage with the two partition nets 5. After fixing the connection, the two meshes 5 are simultaneously placed into the upper mold 1. Then, the locking block 721 on one end of the push rod 71 is locked into the slot 722 of the fixing block 74, so that one end of the push rod 71 presses against the outside of the mesh 5, and the other end of the push rod 71 is locked and fixed to the vent hole 12 of the upper mold 1 by the locking nut 731 and the locking block. Then, the adjusting nut 7132 is turned with a wrench, so that the push rod 71 presses against the mesh 5 more stably from the outside of the mesh 5, thereby achieving the positioning and fixing of the mesh 5.

[0052] Step 4: Load the plastic raw material into the lower mold 2 according to the required weight, and then assemble the upper mold 1 with the partition net 5 to the lower mold 2 through the mold clamping bolt assembly 3 to form a rotational molding mold.

[0053] Step 5: Install the rotational molding mold on the rotational molding machine and send it into the burner for heating and firing. During the heating and firing process, the rotational molding machine will drive the rotational molding mold to rotate, so that the plastic raw material in the rotational molding mold will gradually and evenly melt and adhere to the inner wall of the rotational molding mold and the two sides of the partition 5 under the action of gravity and heat. Preferably, the firing temperature of the burner is 200 degrees and the firing time is half an hour.

[0054] Step 6: Remove the rotational molding mold and rotational molding machine from the burner and stop heating. Continue to rotate the rotational molding mold through the rotational molding machine to cool and shape it. Preferably, the cooling time is half an hour. At the same time, a blower can be used to blow air onto the rotational molding mold to achieve air cooling.

[0055] Step 7: After cooling and molding, stop the rotation of the rotational molding machine and remove the rotational molding mold from the rotational molding machine. Then, disassemble and separate the rotational molding mold, and demold the septic tank 9 with partition 91 after rotational molding.

[0056] Step 8: Machine inspection holes 92 on the septic tank 9 and remove the top rod mechanism 7 from the septic tank 9. The connecting rod 61 will remain in the septic tank 9. Since the diameter of the connecting rod 61 is small, it will not affect the normal use of the septic tank 9. Specifically, after cutting three inspection holes 92 into the septic tank 9, the plastic covering between the top rod 71 and the fixing block 74 can be easily cut through the inspection holes 92, thereby separating the top rod 71 from the formed partition 91 and removing the top rod 71 from the septic tank 9.

[0057] The above are merely some specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. An integrally molded rotational molding mold for septic tanks, comprising an upper mold and a lower mold assembled sequentially, wherein the upper mold and the lower mold together form a rotational molding cavity and are locked and fixed together by a mold clamping bolt assembly, characterized in that: The rotational molding cavity is provided with two spaced partitions that divide the cavity into three chambers. The upper part of the partitions has through holes. The inner sides of the two partitions are fixedly connected by a linkage mechanism. The outer sides of the two partitions are provided with push rod mechanisms. The push rod mechanisms are located on the upper mold and are used to position and fix the partitions.

2. The integral molding rotational molding die for septic tanks according to claim 1, characterized in that: The linkage mechanism includes multiple links, which are evenly spaced along the circumference of the mesh, and the two ends of each link are fixedly connected to the mesh on a corresponding side.

3. The integral molding rotational molding die for septic tanks according to claim 1, characterized in that: The push rod mechanism includes an L-shaped push rod, one end of which abuts against the outside of the partition net and a snap-fit ​​assembly is provided between them, and the other end of the push rod is locked and fixed to the vent hole of the upper mold by a locking assembly.

4. The integral molding rotational molding die for septic tanks according to claim 3, characterized in that: The snap-fit ​​assembly includes a snap-fit ​​block and a snap-fit ​​groove. The snap-fit ​​block is cross-shaped and fixedly mounted on one end of the push rod. The snap-fit ​​groove is adapted to the snap-fit ​​block and mounted on a fixing block. The fixing block is fixedly mounted at the center of the outer surface of the partition mesh. The snap-fit ​​block is detachably snapped into the snap-fit ​​groove. The locking assembly includes two locking nuts and two locking plates. The outer surface of the other end of the push rod is provided with an external thread section. The two locking plates are respectively located on the inner and outer sides of the vent hole of the upper mold. The locking plates are provided with annular protrusions adapted to the vent hole. The annular protrusions are embedded in the vent hole. The center of the locking plate is provided with a circular hole through which the push rod can pass. The locking plate is also provided with multiple vents. The two locking nuts are threadedly connected to the external thread section and are respectively located on the outer sides of the two locking plates.

5. The integral molding rotational molding die for septic tanks according to claim 3, characterized in that: The top rod includes an L-shaped first rod and a straight second rod. A tightening fine-tuning assembly is provided between the second rod and the first rod. The tightening fine-tuning assembly includes an adjusting screw and an adjusting nut. The adjusting nut is fixedly sleeved on the middle of the adjusting screw. A first threaded hole is provided in one end of the first rod, and a second threaded hole is provided in one end of the second rod. One end of the adjusting screw is threaded into the first threaded hole, and the other end is threaded into the second threaded hole. The threads at both ends of the adjusting screw have opposite directions of rotation.

6. The integral molding rotational molding die for septic tanks according to claim 1, characterized in that: The mesh size of the partition net is 5-10mm.

7. The integral molding rotational molding die for septic tanks according to claim 1, characterized in that: A reinforcing structural member is fixedly provided on one side surface of the mesh. The reinforcing structural member includes a central plate, an inner ring plate, and an outer ring plate arranged sequentially from the inside to the outside. The central plate, the inner ring plate, and the outer ring plate are fixedly connected by a plurality of strip plates, which are evenly spaced along the circumference of the central plate.

8. The integral molding rotational molding die for septic tanks according to claim 1, characterized in that: A gap is provided between the outer peripheral surface of the partition mesh and the inner peripheral surface of the rotational molding cavity, and an annular plastic block adapted to the gap is fixed on the outer peripheral surface of the partition mesh.

9. The integral molding rotational molding die for septic tanks according to claim 1, characterized in that: The upper mold has an upper annular groove, and the lower mold has a lower annular groove. The upper annular groove of the upper mold and the lower annular groove of the lower mold can surround each other to form an annular groove. The four peripheral edges of the partition mesh extend into the annular groove, and the edges of both sides of the partition mesh are in clearance fit with the annular groove.

10. The one-piece molding manufacturing process of septic tanks, characterized in that: The septic tank is manufactured using the integral rotational molding mold described in any one of claims 1-9, comprising the following process steps: Step 1: Prepare plastic raw materials; Step 2: Apply release agent to the inner walls of the upper and lower molds; Step 3: Fix the two meshes together using a linkage mechanism, then place the fixed meshes into the upper mold and position and fix them using two push rod mechanisms; Step 4: Load the plastic raw material into the lower mold according to the required weight, and then assemble the upper mold with the partition net into the lower mold using the mold clamping bolt assembly to form a rotational molding mold. Step 5: Install the rotational molding mold on the rotational molding machine and send it into the burner for heating and firing. During the heating and firing process, the rotational molding machine will drive the rotational molding mold to rotate, so that the plastic raw material in the rotational molding mold will gradually melt and adhere to the inner wall of the rotational molding mold and the two sides of the mesh under the action of gravity and heat. Step 6: Remove the rotational molding mold and rotational molding machine from the burner and stop heating. Continue to rotate the rotational molding mold through the rotational molding machine to cool and shape it. Step 7: After cooling and molding, stop the rotation of the rotational molding machine and remove the rotational molding mold from the machine. Then, disassemble and separate the rotational molding mold, and demold the septic tank with partitions after rotational molding. Step 8: Drill inspection holes in the septic tank and remove the top rod mechanism from the septic tank.

Images