Injection molding process of high-load-bearing impact-resistant plastic dustbin for construction waste treatment

Abstract

The invention discloses an injection molding process of a high-load-bearing impact-resistant plastic garbage can for construction waste treatment, relates to the technical field of garbage can injection molding processes, and aims at solving the technical problems that when a current garbage can faces steel pipe type construction waste, a stress dispersion structure is lacked, and the damage rate of a can body is high. Compared with an existing injection molding technology, through composite injection molding of the apron units, the double-layer structure of the upper apron, the lower apron, the supporting piece and the elastic material is adopted, the limitation of traditional single-layer injection molding is broken through, the apron units are obliquely stacked, stress is effectively dispersed, the impact resistance, the steel pipe puncture resistance and the bearing capacity of the dustbin are improved, and the service life of the dustbin is prolonged. And the requirements of construction waste treatment are met. Through the rigid-flexible double-layer structure formed by composite injection molding of the apron units and the supporting and inclined stacking design of the supporting pieces, the impact resistance and the steel pipe puncture resistance of the dustbin are improved, the structural stability and the bearing capacity are enhanced, and the construction waste treatment requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding processes for trash bins, and more specifically, to an injection molding process for a high-load-bearing and impact-resistant plastic trash bin for construction waste treatment. Background Art

[0002] With the acceleration of the urbanization process, the generation volume of construction waste has increased sharply. According to statistics, the annual generation volume of construction waste in China exceeds 2 billion tons. Its composition is complex, including sharp or heavy materials such as waste concrete blocks, steel bars, bricks and tiles, steel pipes, etc., which pose strict requirements on the impact resistance and wear resistance of the trash bins for storage.

[0003] When the trash bins produced by the existing injection molding technology are used to handle construction waste such as steel pipes, there are significant problems of insufficient impact resistance. The bottom structure of the existing trash bins often adopts a design of vertical stacking or planar strengthening baffles. When the steel pipes are thrown into the trash bin, the sharp ends of the steel pipes will face the bottom end of the trash bin. In the face of the continuous vertical impact and pressure of the sharp ends of the steel pipes, the traditional structure lacks a buffering and stress dispersion mechanism, and relies entirely on the structural strength to resist the impact, resulting in the impact force being concentrated on a local area, and the stress cannot be effectively dispersed, easily causing situations such as rupture at the connection and piercing of the structure, greatly shortening the service life of the box body, and being difficult to meet the requirements of high-intensity use in the construction waste treatment scenario, restricting its actual application effect. In view of this, we propose an injection molding process for a high-load-bearing and impact-resistant plastic trash bin for construction waste treatment. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the existing technology, adapt to the actual needs, and provide an injection molding process for a high-load-bearing and impact-resistant plastic trash bin for construction waste treatment, so as to solve the technical problem that the current trash bin lacks a stress dispersion structure and has a high box body damage rate when facing construction waste such as steel pipes.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: An injection molding process for a high-load-bearing and impact-resistant plastic trash bin for construction waste treatment, including the following steps: S1. Composite injection molding of the scale plate unit: Simultaneously inject the upper scale plate and the lower scale plate through the upper scale plate injection structure and the lower scale plate injection structure in the injection molding component, and then inject the support member through the secondary injection structure. Inject the elastic material for buffering between the upper scale plate, the lower scale plate and the support member to form a single scale plate unit with a scale plate structure; S2. Rotational molding of the trash bin box body: Rotationally mold the trash bin box body through the rotational molding component; S3. Stacking of the scale plate units and overall assembly of the box body: Insert the scale plate units in an inclined state and stacked in sequence onto the support plate, and then clamp the support plate into the trash bin box body to complete the production of the trash bin.

[0006] Preferably, the rotational molding assembly includes a production mold for the box body, and the rotational molding assembly is used to produce a dustbin box body through the production mold for the box body.

[0007] Preferably, the injection molding assembly includes a housing, an upper scale plate injection molding structure installed at the lower part of the housing, a lower scale plate injection molding structure installed in the middle of the housing, a secondary injection molding structure installed at the upper part of the housing, and an injection molding driving structure installed on the housing; The upper scale plate injection molding structure includes a first upper mold and a first lower mold, and the upper scale plate injection molding structure is used to produce an upper scale plate; The lower scale plate injection molding structure includes a second upper mold and a second lower mold, and the lower scale plate injection molding structure is used to produce a lower scale plate; The secondary injection molding structure includes a secondary injection mold, a mounting plate, a first cylinder, and an inner mold for injecting a support member. The mounting plate is installed on the housing, the first cylinder is installed on the mounting plate, and the output end of the first cylinder is connected to the secondary injection mold. The inner mold for injecting the support member is arranged in the cavity of the secondary injection mold; The injection molding driving structure is used to drive the upper scale plate injection molding structure and the lower scale plate injection molding structure to work.

[0008] Preferably, the injection molding driving structure further includes a lifting structure, a handling structure, a flipping structure, an ejection structure, a lifting structure, and a positioning structure; The lifting structure is used to drive the first upper mold and the second upper mold to move up and down. The handling structure is used to drive the upper scale plate to move to the flipping structure and drive the lower scale plate to move to the lifting structure. The flipping structure is used to flip the upper scale plate and snap the upper scale plate onto the lower scale plate. The ejection structure is used to eject the completed upper scale plate, lower scale plate, and scale unit. The lifting structure is used to lift the lower scale plate to the same height as the upper scale plate. The positioning structure is used to fix the lifting component of the lifting structure so that the lower scale plate will not move downward.

[0009] Preferably, the secondary injection molding structure includes a rotary demolding component, and the rotary demolding component includes a rotary driving device, a sleeve rod, and a rotary demolding cover; The rotary driving device is installed in the secondary injection mold. The sleeve rod is rotatably connected to the output end of the rotary driving device. The rotary demolding cover is rotatably connected to the middle of the inner mold for injecting the support member, and the rotary demolding cover is installed outside the sleeve rod.

[0010] Preferably, the secondary injection molding structure further includes a jacking demolding component, and the jacking demolding component includes a jacking rod and a second cam; The jacking rod is slidably connected in the sleeve rod. The second cam is installed at the end of the jacking rod, and the second cam is in contact with a first cam. The first cam is installed inside the sleeve rod. The first cam and the second cam are used to move the jacking rod up and down when the sleeve rod rotates.

[0011] Preferably, the secondary injection molding structure further includes a side demolding component, which includes a driving rod, a linkage rod, a side demolding block, a guiding disk, and a guiding rod; The driving rod is installed on the ejector rod, the linkage rod is rotatably connected to the driving rod, the other end of the linkage rod is rotatably connected to the side demolding block, the side demolding block is movably connected in a through groove on the side of the support piece injection mold, the guiding disk is installed on the support piece injection mold, and the guiding disk is slidably connected to the ejector rod. A plurality of the guiding rods are equidistantly and annularly installed on the guiding disk, and the other ends of the plurality of guiding rods are all connected to the side demolding block.

[0012] Preferably, an air inlet hole is formed in the support piece injection mold, the air inlet hole is connected to an external air source, and after the side demolding block moves, an air outlet hole is formed in the through groove on the side of the support piece injection mold.

[0013] Preferably, the trash can includes a trash can body, a scale plate structure, and a support plate; The scale plate structure includes an upper scale plate, a lower scale plate, and a support piece. The upper scale plate and the lower scale plate form a scale plate unit. The front ends of a plurality of scale plate units are staggeredly stacked upward and obliquely above the support plate. A plurality of the support pieces are arranged at the bottom end of the upper scale plate, and a plurality of the support pieces are fixed in through grooves of the lower scale plate by an elastic material.

[0014] Preferably, the support piece includes an upper support portion, a transition portion, and a lower support portion; The upper support portion is a variable cross-section hexagonal structure, and the variable cross-section hexagonal structure gradually shrinks from the bottom to the top. The transition portion is an outwardly curved arc surface structure, and the lower support portion is an equal cross-section hexagonal prism structure.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Compared with the existing injection molding technology, the present invention, through the composite injection molding of scale plate units, adopts a double-layer structure of an upper scale plate, a lower scale plate, a support piece and an elastic material, breaks through the limitations of traditional single-layer injection molding, and with the inclined stacking design of scale plate units, further optimizes the force, reduces the direct surface impact, effectively disperses stress, improves the impact resistance, the force resistance of steel pipe puncture, and the load-bearing capacity of the trash can, and meets the requirements of construction waste treatment. Through the rigid-flexible double-layer structure of the composite injection molding of scale plate units, the support of the support piece and the inclined stacking design, the present invention improves the impact resistance and the steel pipe puncture resistance of the trash can, enhances the structural stability and the load-bearing capacity, and meets the requirements of construction waste treatment.

[0016] 2. After the injection molding process is completed, the rotary demolding cover of the present invention rotates. The rotary drive device is activated, and the internal servo motor outputs to drive the sleeve rod to rotate. The rotary demolding cover outside the sleeve rod rotates synchronously under the drive of the sleeve rod. Through the combined action of centrifugal force and friction, the support member adhered to the inner injection mold of the support member gradually loosens, separating the product from the mold side wall, and avoiding damage to the just-processed support member caused by directly using vertical pulling force for demolding. Through the rotary demolding cover, after the support member is produced, the support member can be loosened on the inner injection mold of the support member through the horizontal rotational force, making it easier for the support member to be demolded. 3. Through the jacking demolding component and the side demolding structure, during the rotation of the sleeve rod, the first cam of the jacking demolding component cooperates with the second cam. When the sleeve rod rotates, the second cam rolls along the spiral surface of the first cam, driving the ejector rod to perform regular up-and-down reciprocating movements inside the sleeve rod, further loosening the adhesion between the product and the inner injection mold of the support member. The side demolding component drives the driving rod to move up and down through the ejector rod, and the driving rod then converts the linear motion into the horizontal telescopic motion of the side demolding block through the linkage rod. Twelve guide rods and the guide disk form a stable guiding system to ensure that the side demolding block slides smoothly in the side through groove of the inner injection mold of the support member. When the ejector rod rises, the side demolding block extends synchronously and inserts between the product and the mold side wall, using the lateral force generated by the wedge-shaped structure to separate the product from the mold side wall; when the ejector rod descends, the side demolding block retracts and resets. Through the linkage operation of the jacking demolding component and the side demolding structure, vertical and horizontal multi-directional forces are applied to the product, enabling the product to be demolded with higher efficiency.

[0017] 4. Through the setting of the air inlet hole, a pneumatic-assisted demolding system is constructed, which cooperates with the mechanical demolding structure to further improve the demolding efficiency and product integrity. After the side demolding block is driven by the ejector rod to move out of the side through groove of the inner injection mold of the support member, the originally closed through groove is transformed into an air outlet hole, forming a through airflow channel with the air inlet hole. The external high-pressure air source injects compressed air into the mold through the air inlet hole, and the high-speed airflow rapidly flows along the gap between the product and the mold inner wall, forming a uniform air film layer between the two. This air film layer can not only significantly reduce the friction between the product and the mold, but also use the air pressure difference to generate an outward thrust to assist in loosening the adhered parts. The buffering effect of the air film avoids the direct rigid contact between the mechanical components and the product during the demolding process, effectively preventing scratches on the surface of the scale plate or local damage to the elastic connecting body. By setting the air inlet hole, the present invention constructs a pneumatic-assisted demolding system, reduces the friction between the product and the mold, and generates an outward thrust through the air pressure difference to assist in demolding.

[0018] 5. The present invention improves the structure of the garbage bin by adding a scale plate structure. In the scale plate structure, the scale plate unit composed of the upper scale plate and the lower scale plate realizes the protection against the impact of garbage. The receiving groove of the upper scale plate scale and the convex block of the lower scale plate scale form a precise fitting structure. After injecting an elastic material into the connection channel between the two, a connection system with both rigidity and flexibility is formed. This elastic material, such as polyurethane elastomer, can produce a certain amount of deformation when absorbing the impact force. By setting the scale plate structure in the garbage bin structure and through the elastic connection of the scale plate structure, the impact energy of the steel pipe can be converted into elastic potential energy, avoiding stress concentration.

[0019] 6. The present invention sets a support member below the upper scale plate. The support member adopts a composite form design. The variable cross-section hexagonal structure of the upper support part evenly disperses the top load to the transition part through the gradual change of the cross-sectional area along the inclined edges of the hexagonal structure; the arc surface structure of the transition part is like an elastic buffer layer, which can absorb and redistribute the stress from the upper support part, avoiding stress mutation; the hexagonal prism of the lower support part has improved compressive strength while maintaining light weight, and its hexagonal geometric configuration can make the stress conduct evenly in all directions, ensuring that the box body does not deform under long-term loading. By the composite improvement of the support member structure, the scale plate structure can have higher compressive strength when bearing a large weight, making the box body not easy to deform. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the rotational molding assembly of the present invention; Figure 2 is a schematic structural diagram of the injection molding assembly of the present invention; Figure 3 is a schematic internal structure diagram of the secondary injection mold of the present invention; Figure 4 is a schematic structural diagram of the injection mold inner mold of the support member of the present invention and its connection structure; Figure 5 is a schematic cross-sectional structural diagram of the injection mold inner mold of the support member of the present invention and its connection structure; Figure 6 is a schematic structural diagram of the side demolding component of the present invention; Figure 7 is a schematic structural diagram of the injection molding assembly of the present invention with the housing removed; Figure 8 For the present invention Figure 7 The enlarged schematic diagram at A in Figure 9 is a schematic internal structure diagram of the injection molding assembly of the present invention when producing the scale unit; Figure 10 is a schematic structural diagram of the flipping structure of the present invention; Figure 11 is a schematic structural diagram of the ejection structure of the present invention; Figure 12 Schematic diagram of the lifting structure of the present invention; Figure 13 Schematic diagram of the garbage bin body of the present invention; Figure 14 Schematic diagram of the present invention when installing the scale plate structure on the support plate; Figure 15 Schematic diagram of the scale plate unit of the present invention; Figure 16 Schematic diagram of the support member of the present invention.

[0021] Explanation of the reference numerals in the figure: 1, rotational molding assembly; 2, injection molding assembly; 3, upper scale plate injection molding structure; 4, lower scale plate injection molding structure; 5, secondary injection molding structure; 6, injection molding drive structure; 7, garbage bin body; 8, scale plate structure; 9, support plate; 201, housing; 301, first upper mold; 302, first lower mold; 401, second upper mold; 402, second lower mold; 501, secondary injection mold; 502, mounting plate; 503, first cylinder; 504, support member injection inner mold; 505, rotary demolding member; 506, jacking demolding member; 507, side demolding member; 5041, air inlet hole; 5051, rotary drive device; 5052, sleeve rod; 5053, rotary demolding cover; 5054, first cam; 5061, ejector rod; 5062, second cam; 5071, drive rod; 5072, linkage rod; 5073, side demolding block; 5074, guide disk; 5075, guide rod; 601, lifting structure; 602, handling structure; 603, flipping structure; 604, ejecting structure; 605, lifting structure; 606, positioning structure; 6011, second cylinder; 6012, first guide member; 6021, slide rail; 6022, rail trolley; 6023, auxiliary rod; 6031, adjustable jaw structure; 6032, fixing plate; 6033, flipping shaft; 6034, gear; 6035, rack; 6036, chute; 6037, drive plate; 6038, third cylinder; 6041, mounting frame; 6042, ejecting hole; 6043, ejecting plate; 6044, ejecting rod; 6045, reset elastic member; 6051. Insert block; 6052. Lifting block; 6053. Suction cup structure; 6054. Fourth cylinder; 6055. Second guide 6061. Fifth cylinder; 6062. Positioning plate; 6063. Positioning hole 801. Upper scale plate; 802. Lower scale plate; 803. Support member; 804. Upper support portion; 805. Transition portion; 806. Lower support portion Detailed implementation mode

[0022] Example 1, as Figures 1 to 16 shown, an injection molding process for a high-load and impact-resistant plastic trash can for construction waste treatment according to the present invention includes the following steps: S1. Composite injection molding of the scale plate unit: The upper scale plate 801 and the lower scale plate 802 are simultaneously injection molded through the upper scale plate injection structure 3 and the lower scale plate injection structure 4 in the injection molding assembly 2, and then the support member 803 is secondarily injection molded through the secondary injection structure 5. An elastic material for buffering is injection molded between the upper scale plate 801, the lower scale plate 802, and the support member 803 to form a single scale plate unit of the scale plate structure 8.

[0023] During operation here, the injection-molded upper scale plate 801 and lower scale plate 802 are demolded to the first lower mold 302 and the second upper mold 401 through the ejection structure 604. The handling structure 602 drives the first lower mold 302 to move to the flipping structure 603 and drives the second lower mold 402 to move to the lifting structure 605. The lifting structure 605 drives the second lower mold 402 to move up to the same horizontal plane as the first lower mold 302, and fixes the lifted second lower mold 402 through the positioning structure 606. The flipping structure 603 clamps the upper scale plate 801 demolded on the first lower mold 302, drives the upper scale plate 801 to flip 180° and then cover it on the lower scale plate 802. Subsequently, the secondary injection mold 501 cooperates with the second lower mold 402 to form a structure for secondarily injecting the upper scale plate 801 and the lower scale plate 802.

[0024] S2. Rotational molding of the trash can body 7: The trash can body 7 is formed by rotational molding through the rotational molding assembly 1.

[0025] S3. Stacking of scale plate units and general assembly of the box body: The scale plate units are inserted into the support plate 9 in an inclined state and stacked in sequence. Subsequently, the support plate 9 is placed into the trash can body, and the support plate 9 is clamped tightly into the trash can body 7 by pressing to complete the production of the trash can.

[0026] Compared with the existing injection molding technology, the present invention uses a double-layer structure of an upper scale plate 801, a lower scale plate 802, a support member 803 and an elastic material through composite injection molding of the scale plate unit, breaking through the limitations of traditional single-layer injection molding. Moreover, the inclined stacked design of the scale plate unit further optimizes the force, reduces direct surface impact, effectively disperses stress, improves the anti-impact performance, the anti-steel pipe puncture force performance and the load-bearing capacity of the garbage bin, and meets the needs of construction waste treatment. Through the rigid-flexible double-layer structure of composite injection molding of the scale plate unit, the support of the support member 803 and the inclined stacked design, the present invention improves the anti-impact and anti-steel pipe puncture performance of the garbage bin, enhances the structural stability and the load-bearing capacity, and meets the needs of construction waste treatment.

[0027] Specifically, as Figures 1 to 12 shown, the rotational molding assembly 1 involved in the present invention includes a box body production mold, and the rotational molding assembly 1 is used to produce a garbage bin box body 7 through the box body production mold.

[0028] The injection molding assembly 2 includes a housing 201, an upper scale plate injection molding structure 3 installed at the lower part of the housing 201, a lower scale plate injection molding structure 4 installed in the middle of the housing 201, a secondary injection molding structure 5 installed at the upper part of the housing 201, and an injection molding driving structure 6 installed on the housing 201; The upper scale plate injection molding structure 3 includes a first upper mold 301 and a first lower mold 302, and the upper scale plate injection molding structure 3 is used to produce the upper scale plate 801; The lower scale plate injection molding structure 4 includes a second upper mold 401 and a second lower mold 402, and the lower scale plate injection molding structure 4 is used to produce the lower scale plate 802; The secondary injection molding structure 5 includes a secondary injection mold 501, a mounting plate 502, a first cylinder 503, and a support member injection inner mold 504. The mounting plate 502 is installed on the housing 201, the first cylinder 503 is installed on the mounting plate 502, and the output end of the first cylinder 503 is connected to the secondary injection mold 501. The support member injection inner mold 504 is arranged in the cavity of the secondary injection mold 501; The injection molding driving structure 6 is used to drive the upper scale plate injection molding structure 3 and the lower scale plate injection molding structure 4 to work.

[0029] The lifting structure 601 includes a second cylinder 6011 and a first guide member 6012; both the second cylinder 6011 and the first guide member 6012 are installed on the housing 201. One side of the first upper mold 301 and the second upper mold 401 are respectively connected to the output ends of the two second cylinders 6011, and the other sides of the first upper mold 301 and the second upper mold 401 are respectively installed on the first guide member 6012.

[0030] The conveying structure 602 includes a slide rail 6021, a rail trolley 6022 and an auxiliary rod 6023; the slide rail 6021 is installed on the housing 201, the rail trolley 6022 is slidably connected to the slide rail 6021, one side of the first lower die 302 and the second lower die 402 are respectively installed on the two rail trolleys 6022, the auxiliary rod 6023 is installed on the housing 201, and the other side of the first lower die 302 and the second lower die 402 are respectively attached to one side of the two auxiliary rods 6023.

[0031] The flipping structure 603 includes an adjustable jaw structure 6031, a fixing plate 6032, a flipping shaft 6033, a gear 6034, a rack 6035, a chute 6036, a driving plate 6037, and a third cylinder 6038; the adjustable jaw structure 6031 is arranged in the middle of the housing 201, and the adjustable jaw structure 6031 is rotatably installed on the fixing plate 6032, the flipping shaft 6033 is connected to the adjustable jaw structure 6031, the gear 6034 is installed on the flipping shaft 6033, and the gear 6034 is meshed and connected to the rack 6035, the rack 6035 is slidably connected to the chute 6036, the driving plate 6037 is installed on the rack 6035, and the driving plate 6037 is installed on the output end of the third cylinder 6038, both the chute 6036 and the third cylinder 6038 are installed in the middle of the housing 201, and the adjustable jaw structure 6031 is used to clamp the upper scale plate 801 and drive the upper scale plate 801 to perform a 180° flip and be clamped together with the lower scale plate 802.

[0032] The ejecting structure 604 includes a mounting frame 6041, an ejecting hole 6042, an ejecting plate 6043, an ejecting rod 6044, and a reset elastic member 6045; the two mounting frames 6041 are respectively installed on the tops of the first upper die 301 and the second upper die 401, the ejecting hole 6042 is opened at the top of the mounting frame 6041, the ejecting plate 6043 is arranged below the mounting frame 6041, the ejecting rod 6044 is installed on the ejecting plate 6043, and the two groups of ejecting rods 6044 respectively penetrate into the first upper die 301 and the second upper die 401, the reset elastic member 6045 is sleeved on the ejecting rod 6044, and the two groups of reset elastic members 6045 are respectively connected between the two groups of ejecting plates 6043 and the first upper die 301 and the second upper die 401.

[0033] The lifting structure 605 includes an insert block 6051, a lifting block 6052, a suction cup structure 6053, a fourth cylinder 6054, and a second guide member 6055; the insert block 6051 is connected to a rail trolley 6022, the lifting block 6052 is installed on one side of the second lower die 402, and the lifting block 6052 is inserted and connected to the insert block 6051. The suction cup structure 6053 is located above the lifting block 6052, and the suction cup structure 6053 is installed at the output end of the fourth cylinder 6054. Both the fourth cylinder 6054 and the second guide member 6055 are installed at the lower part of the housing 201, and the second guide member 6055 is installed on the other side of the second lower die 402.

[0034] The positioning structure 606 includes a fifth cylinder 6061, a positioning plate 6062, and a positioning hole 6063; the fifth cylinder 6061 is installed in the middle of the housing 201, the positioning plate 6062 is installed at the output end of the fifth cylinder 6061, the positioning hole 6063 is opened on one side of the second lower die 402, and the positioning hole 6063 is adapted to a plug rod protruding from the positioning plate 6062.

[0035] When the present invention is working, two second cylinders 6011 drive the first upper die 301 and the second upper die 401 to move downward along the two first guide members 6012, and the first lower die 302 and the second lower die 402 complete mold closing, and the upper scale plate 801 and the lower scale plate 802 are injection-molded. After the injection molding is completed, an external ejecting device drives the ejecting plate 6043 to move through the ejecting hole 6042, the ejecting plate 6043 drives the ejecting rod 6044 to move, and the ejecting rod 6044 ejects the upper scale plate 801 and the lower scale plate 802 onto the first lower die 302 and the second lower die 402. After ejecting the molded part, the rail trolley 6022 drives the insert block 6051 to move, the insert block 6051 drives the lifting block 6052 to move, the lifting block 6052 drives the first lower die 302 and the second lower die 402 to move along the slide rail 6021, and the straight line of the first lower die 302 and the second lower die 402 is assisted by the auxiliary rod 6023, so that the first lower die 302 moves to the lifting structure 605, and the second lower die 402 moves to the handling structure 602. When the second lower die 402 moves to the lifting structure 605, the fourth cylinder 6054 drives the suction cup structure 6053 to adsorb on the lifting block 6052, so that the lifting block 6052 moves upward, and the lifting block 6052 drives the second lower die 402 to move upward to be on the same plane as the first lower die 302. At this time, the fifth cylinder 6061 drives the positioning plate 6062 to extend, and the plug rod on the positioning plate 6062 is inserted into the positioning hole 6063 to fix the position of the second lower die 402. After the second lower die 402 is lifted, the upper scale plate 801 is clamped by the adjustable jaw structure 6031. The third cylinder 6038 drives the rack 6035 to move along the chute 6036 through the driving plate 6037. When the rack 6035 moves, it rotates the gear 6034 to drive the turning shaft 6033 to rotate. The turning shaft 6033 drives the adjustable jaw structure 6031 to perform a 180° flip, so that the upper scale plate 801 is clamped to the lower scale plate 802.

[0036] Further, as Figures 3 to 5 shown, the secondary injection molding structure 5 of the present invention includes a rotary demolding member 505. The rotary demolding member 505 includes a rotary driving device 5051, a sleeve rod 5052, and a rotary demolding cover 5053. The rotary driving device 5051 is installed in the secondary injection mold 501. The sleeve rod 5052 is rotatably connected to the output end of the rotary driving device 5051. The rotary demolding cover 5053 is rotatably connected to the middle of the support member injection inner mold 504, and the rotary demolding cover 5053 is installed outside the sleeve rod 5052.

[0037] With the rotary demolding cover 5053 of the present invention, after the injection molding process is completed, the rotary driving device 5051 is started, and its internal servo motor outputs to drive the sleeve rod 5052 to rotate. The rotary demolding cover 5053 outside the sleeve rod 5052 rotates synchronously under the drive of the sleeve rod 5052. Through the combined action of centrifugal force and friction, the support member 803 adhered to the support member injection inner mold 504 is gradually loosened, and the product is separated from the mold side wall, avoiding damage to the just processed support member 803 caused by directly using vertical pulling force for demolding. With the rotary demolding cover 5053 of the present invention, after the support member 803 is produced, the support member 803 can be loosened on the support member injection inner mold 504 by the horizontal rotational force, so that the support member 803 is easier to demold.

[0038] Even further, as Figures 3 to 5 shown, the secondary injection molding structure 5 of the present invention further includes a jacking demolding member 506. The jacking demolding member 506 includes a jacking rod 5061 and a second cam 5062. The jacking rod 5061 is slidably connected inside the sleeve rod 5052. The second cam 5062 is installed at the end of the jacking rod 5061, and the second cam 5062 is in contact with a first cam 5054. The first cam 5054 is installed inside the sleeve rod 5052. The first cam 5054 and the second cam 5062 are used to move the jacking rod 5061 up and down when the sleeve rod 5052 rotates.

[0039] The secondary injection molding structure 5 further includes a side demolding component 507, and the side demolding component 507 includes a driving rod 5071, a linkage rod 5072, a side demolding block 5073, a guide disk 5074, and a guide rod 5075; the driving rod 5071 is installed on the ejector rod 5061, the linkage rod 5072 is rotatably connected to the driving rod 5071, the other end of the linkage rod 5072 is rotatably connected to the side demolding block 5073, the side demolding block 5073 is movably connected in a through groove on the side of the support part injection inner mold 504, the guide disk 5074 is installed on the support part injection inner mold 504, and the guide disk 5074 is slidably connected to the ejector rod 5061. Twelve guide rods 5075 are equidistantly and annularly installed on the guide disk 5074, and the other ends of the twelve guide rods 5075 are all connected to the side demolding block 5073.

[0040] In the present invention, through the jacking demolding component 506 and the side demolding structure, during the rotation of the sleeve rod 5052, the first cam 5054 of the jacking demolding component 506 cooperates with the second cam 5062. When the sleeve rod 5052 rotates, the second cam 5062 rolls along the spiral surface of the first cam 5054, driving the ejector rod 5061 to make regular up-and-down reciprocating movements within the sleeve rod 5052, further loosening the adhesion between the product and the support part injection inner mold 504. The side demolding component 507 drives the driving rod 5071 to move up and down through the ejector rod 5061, and the driving rod 5071 then converts the linear motion into the horizontal telescopic motion of the side demolding block 5073 through the linkage rod 5072. The twelve guide rods 5075 and the guide disk 5074 form a stable guiding system to ensure the smooth sliding of the side demolding block 5073 in the through groove on the side of the support part injection inner mold 504. When the ejector rod 5061 rises, the side demolding block 5073 synchronously extends and inserts between the product and the mold side wall, and uses the lateral force generated by the wedge-shaped structure to separate the product from the mold side wall; when the ejector rod 5061 descends, the side demolding block 5073 retracts and resets. Through the linkage operation of the jacking demolding component 506 and the side demolding structure, the present invention applies forces in the vertical direction and multiple horizontal directions to the product, enabling the product to be demolded with high efficiency.

[0041] Furthermore, as Figures 3 to 6 shown, an air inlet hole 5041 is provided on the support part injection inner mold 504 involved in the present invention, the air inlet hole 5041 is connected to an external air source, and after the side demolding block 5073 moves, an air outlet hole is formed in the through groove on the side of the support part injection inner mold 504.

[0042] Through the provision of the air inlet hole 5041, the present invention constructs a pneumatic-assisted demolding system, which acts in synergy with the mechanical demolding structure to further improve the demolding efficiency and the integrity of the product. When the side demolding block 5073 is driven by the ejector rod 5061 to move out of the side through groove of the support piece injection mold inner mold 504, the originally closed through groove is transformed into an air outlet hole, forming a through airflow channel with the air inlet hole 5041. The external high-pressure air source injects compressed air into the mold interior through the air inlet hole 5041, and the high-speed airflow rapidly flows along the gap between the product and the mold inner wall, forming a uniform air film layer between the two. This air film layer can not only significantly reduce the friction force between the product and the mold, but also generate an outward thrust using the air pressure difference to assist in loosening the adhered parts. The buffering effect of the air film avoids the direct rigid contact between mechanical components and the product during the demolding process, effectively preventing scratches on the surface of the scale plate or local damage to the elastic connection body. The present invention constructs a pneumatic-assisted demolding system by providing the air inlet hole 5041, reduces the friction force between the product and the mold, and generates an outward thrust through the air pressure difference to assist in demolding.

[0043] Furthermore, as Figures 13 to 16 shown, the trash can involved in the present invention includes a trash can body 7, a scale plate structure 8, and a support plate 9; the scale plate structure 8 includes an upper scale plate 801, a lower scale plate 802, and a support piece 803. The upper scale plate 801 and the lower scale plate 802 form a scale plate unit, and the front ends of twenty scale plate units are stacked in a staggered manner with an upward inclination above the support plate 9. Three support pieces 803 are provided at the bottom end of the upper scale plate 801, and the three support pieces 803 are fixed in the through grooves of the lower scale plate 802 through an elastic material.

[0044] The support piece 803 includes an upper support portion 804, a transition portion 805, and a lower support portion 806; the upper support portion 804 is a variable cross-section hexagonal structure, and the variable cross-section hexagonal structure gradually shrinks from the bottom to the top. The transition portion 805 is an outwardly curved arc surface structure, and the lower support portion 806 is an equal cross-section hexagonal prism structure.

[0045] By improving the trash can structure, the present invention adds a scale plate structure 8. In the scale plate structure 8, the scale plate unit composed of the upper scale plate 801 and the lower scale plate 802 realizes the protection against the impact of garbage. The receiving groove of the scale of the upper scale plate 801 and the convex block of the scale of the lower scale plate 802 form a precise fitting structure. After injecting an elastic material into the connection channel between the two, a connection system with both rigidity and flexibility is formed. This elastic material, such as polyurethane elastomer, can generate a certain amount of deformation when absorbing the impact force. By providing the scale plate structure 8 in the trash can structure, the present invention can convert the impact energy of the steel pipe into elastic potential energy through the elastic connection of the scale plate structure 8, avoiding stress concentration.

[0046] In the present invention, a support member 803 is provided below the upper scale plate 801. The support member 803 adopts a composite form design. The variable cross-section hexagonal structure of the upper support portion 804 gradually changes the cross-sectional area, and distributes the top load evenly to the transition portion 805 through the inclined edges of the hexagonal structure. The arc surface structure of the transition portion 805 is like an elastic buffer layer, which can absorb and redistribute the stress from the upper support portion 804 to avoid stress mutation. The hexagonal prism of the lower support portion 806 has improved compressive strength while maintaining light weight. Its hexagonal geometric configuration can conduct stress evenly in all directions to ensure that the box does not deform under long-term loading. Through the composite improvement of the structure of the support member 803, the present invention enables the scale plate structure 8 to have higher compressive strength when bearing a large weight, making the box less likely to deform.

[0047] The embodiments disclosed in the present invention are preferred embodiments, but not limited thereto. Those of ordinary skill in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not depart from the spirit of the present invention, they are within the protection scope of the present invention.

Claims

1. An injection molding process for a high-load-bearing and impact-resistant plastic garbage bin used for construction waste treatment, characterized in that, It includes the following steps: S1. Composite injection molding of the scale plate unit: The upper scale plate and the lower scale plate are simultaneously injection-molded through the upper scale plate injection structure and the lower scale plate injection structure in the injection molding assembly, and then the support is secondarily injection-molded through the secondary injection structure. An elastic material for buffering is injection-molded between the upper scale plate, the lower scale plate and the support to form a single scale plate unit of the scale plate structure; S2. Rotational molding of the trash bin body: The trash bin body is formed by rotational molding through the rotational molding assembly; S3. Stacking of scale plate units and general assembly of the box body: The scale plate units are inserted onto the support plate in an inclined state and stacked in sequence, and then the support plate is clamped into the trash bin body to complete the production of the trash bin.

2. The injection molding process of a high-load-bearing and impact-resistant plastic garbage bin for construction waste treatment according to claim 1, characterized in that, The rotational molding assembly includes a box body production mold, and the rotational molding assembly is used to produce the trash bin body through the box body production mold.

3. The injection molding process of a high-load-bearing and impact-resistant plastic garbage bin for construction waste treatment according to claim 2, characterized in that, The injection molding assembly includes a housing, an upper scale plate injection structure installed at the lower part of the housing, a lower scale plate injection structure installed in the middle of the housing, a secondary injection structure installed at the upper part of the housing, and an injection molding drive structure installed on the housing; The upper scale plate injection structure includes a first upper mold and a first lower mold, and the upper scale plate injection structure is used to produce the upper scale plate; The lower scale plate injection structure includes a second upper mold and a second lower mold, and the lower scale plate injection structure is used to produce the lower scale plate; The secondary injection structure includes a secondary injection mold, a mounting plate, a first cylinder, and an inner support injection mold for the support. The mounting plate is installed on the housing, the first cylinder is installed on the mounting plate, and the output end of the first cylinder is connected to the secondary injection mold. The inner support injection mold for the support is arranged in the cavity of the secondary injection mold; The injection molding drive structure is used to drive the upper scale plate injection structure and the lower scale plate injection structure to work.

4. The injection molding process of a high-load-bearing and impact-resistant plastic garbage bin for construction waste treatment according to claim 3, characterized in that, The injection molding drive structure further includes a lifting structure, a handling structure, a flipping structure, an ejection structure, a lifting structure, and a positioning structure; The lifting structure is used to drive the first upper mold and the second upper mold to move up and down. The handling structure is used to drive the upper scale plate to move to the flipping structure and drive the lower scale plate to move to the lifting structure. The flipping structure is used to flip the upper scale plate and clamp the upper scale plate onto the lower scale plate. The ejection structure is used to eject the completed upper scale plate, lower scale plate, and scale unit. The lifting structure is used to lift the lower scale plate to the same height as the upper scale plate. The positioning structure is used to fix the lifting component of the lifting structure so that the lower scale plate will not move downward.

5. The injection molding process of a high-load-bearing and impact-resistant plastic garbage bin for construction waste treatment according to claim 3, characterized in that, The secondary injection structure includes a rotary demolding component, and the rotary demolding component includes a rotary drive device, a sleeve rod, and a rotary demolding cover; The rotary drive device is installed in the secondary injection mold. The sleeve rod is rotatably connected to the output end of the rotary drive device. The rotary demolding cover is rotatably connected to the middle of the inner support injection mold for the support, and the rotary demolding cover is installed outside the sleeve rod.

6. The injection molding process of a high-load-bearing and impact-resistant plastic garbage bin for construction waste treatment according to claim 3, characterized in that, The secondary injection structure further includes a jacking demolding component, and the jacking demolding component includes a jacking rod and a second cam; The jacking rod is slidably connected in the sleeve rod. The second cam is installed at the end of the jacking rod, and the second cam is in contact with a first cam. The first cam is installed inside the sleeve rod. The first cam and the second cam are used to move the jacking rod up and down when the sleeve rod rotates.

7. The injection molding process of a high-load-bearing and impact-resistant plastic garbage bin for construction waste treatment according to claim 3, characterized in that, The secondary injection molding structure further includes a side demolding component, and the side demolding component includes a driving rod, a linkage rod, a side demolding block, a guide disk, and a guide rod; The driving rod is installed on the ejector rod, the linkage rod is rotatably connected to the driving rod, the other end of the linkage rod is rotatably connected to the side demolding block, the side demolding block is movably connected in a through groove on the side of the support piece injection mold inner mold, the guide disk is installed on the support piece injection mold inner mold, and the guide disk is slidably connected to the ejector rod. A plurality of the guide rods are installed on the guide disk at equal intervals in a circular shape, and the other ends of the plurality of guide rods are all connected to the side demolding block.

8. The injection molding process of a high-load-bearing and impact-resistant plastic garbage bin for construction waste treatment according to claim 7, characterized in that, An air inlet hole is formed in the support piece injection mold inner mold, the air inlet hole is connected to an external air source, and after the side demolding block moves, an air outlet hole is formed in the through groove on the side of the support piece injection mold inner mold.

9. The injection molding process of a high-load-bearing and impact-resistant plastic garbage bin for construction waste treatment according to claim 8, characterized in that, The garbage bin includes a garbage bin body, a scale plate structure, and a support plate; The scale plate structure includes an upper scale plate, a lower scale plate, and a support piece. The upper scale plate and the lower scale plate form a scale plate unit. The front ends of a plurality of scale plate units are stacked staggeredly upward and obliquely above the support plate. A plurality of the support pieces are arranged at the bottom end of the upper scale plate, and a plurality of the support pieces are fixed in through grooves of the lower scale plate through an elastic material.

10. The injection molding process of a high-load-bearing and impact-resistant plastic garbage bin for construction waste treatment according to claim 9, characterized in that, The support piece includes an upper support portion, a transition portion, and a lower support portion; The upper support portion is a variable cross-section hexagonal structure, and the variable cross-section hexagonal structure gradually shrinks from the bottom to the top. The transition portion is an outwardly curved arc surface structure, and the lower support portion is an equal cross-section hexagonal prism structure.

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