Injection mold and forming method for high-impact-resistance wear-resistant folding logistics box

Abstract

The invention discloses an injection mold and a forming method for a high-impact-resistance wear-resistant folding logistics box, relates to the technical field of injection molds, and aims to solve the technical problems that when an existing injection mold is used for forming a logistics box side plate with a complex structure, the flow speed of molten plastic is low due to a narrow cavity, and the forming effect is affected. Comprising a supporting base, a fixed mold and a movable mold, the fixed mold is arranged at the top of the supporting base, the fixed mold is connected with the side wall of the supporting base through a plurality of guide rods, the movable mold is movably arranged on the guide rods, an outer side male mold is arranged on the side wall of the fixed mold, an extrusion cavity is formed in the side wall of the fixed mold, and an injection molding hole is formed in the side wall of the extrusion cavity; the top of the inner side groove extends to the top of the movable mold, and an extrusion insertion plate is movably arranged in the inner side groove. The injection mold has the advantage that the logistics box side plate with a complex structure can still be subjected to injection molding without molten plastic passing through a narrow cavity with many paths.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molds, and more specifically, to an injection mold and a molding method for a high-impact-resistant and wear-resistant folding logistics box. Background Art

[0002] At present, with the booming development of the logistics industry, the performance requirements for logistics boxes are becoming increasingly stringent. High-impact-resistant and wear-resistant folding logistics boxes are favored by the market due to their excellent physical properties and convenient storage characteristics; As shown in the attached drawings of the specification Figures 1 - 2 , Figure 1 is a schematic diagram of the overall structure of a high-impact-resistant and wear-resistant folding logistics box, Figure 2 is a schematic diagram of the side plate structure of the logistics box. The logistics box includes a base and four side plates. The side plates are connected to the base through a hinge structure. The side plates of the logistics box are of a multi-layer structure. The outer layer is a grid-like structure composed of regularly arranged grids. This grid-like structure helps to reduce the weight while ensuring a certain strength. The inner layer connected to the outer layer grid-like structure is a flat plate. The interior of the flat plate is a hollow structure. A plurality of connecting ribs are arranged in the hollow structure. The connecting ribs enhance the stability of the hollow structure. The flat plate forms a double-layer plate structure through the hollow structure. Even if one layer of the plate is cracked by impact, the other layer of the plate can still maintain normal use functions, and the associated damage caused by impact between the two is small, so that the side plate of the logistics box has better impact resistance and wear resistance.

[0003] Existing injection molds usually consist of a fixed mold and a movable mold. After the fixed mold and the movable mold are clamped together, a cavity in the shape of the product is formed. The injection molding machine is used to inject molten plastic into the cavity. After the molten plastic cools and forms, operations such as mold opening and demolding are carried out to obtain the produced product. However, when the above-mentioned side plate of the logistics box is molded by a conventional injection mold, due to the special shape of the side plate of the logistics box, the grid-like structure on the outer layer and the hollow structure inside the flat plate will both cause the cavity channels formed by the mold to be relatively narrow and have many flow paths. This narrow multi-path channel is likely to cause the flow rate of the molten plastic to be slow, and then local cooling and forming of the molten plastic that has not been fully circulated may occur, affecting the forming effect. In view of this, we propose an injection mold and a molding method for a high-impact-resistant and wear-resistant folding logistics box. Summary of the Invention

[0004] The purpose of the present invention is to provide an injection mold and a molding method for a high-impact-resistant and wear-resistant folding logistics box to solve the technical problem that when the existing injection mold molds the side plate of the logistics box with a complex structure, the flow rate of the molten plastic is likely to be slow due to the narrow cavity, affecting the molding effect.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: An injection mold for a high impact-resistant and wear-resistant folding logistics box, comprising a support base, a fixed mold and a movable mold. The fixed mold is arranged on the top of the support base, and the fixed mold and the side wall of the support base are connected by a plurality of guide rods. The movable mold is movably arranged on the guide rods. An outer convex mold is arranged on the side wall of the fixed mold, and the outer convex mold is used to form the outer grid structure of the side plate of the logistics box. An extrusion cavity is opened on the side wall of the fixed mold, and an injection hole is opened on the side wall of the extrusion cavity. An inner mold groove is opened on the side wall of the movable mold, and the inner mold groove is used to form the inner plane structure of the side plate of the logistics box. The top of the inner mold groove extends to the top of the movable mold, and an extrusion plug is movably arranged in the inner mold groove. The extrusion plug includes an inner cavity template, and the inner cavity template is used to form the hollow layer of the side plate of the logistics box. When the movable mold and the fixed mold are closed, the inner mold groove and the outer convex mold form an appearance cavity, and an extrusion channel is formed between the upper end of the inner mold groove and the extrusion cavity. The appearance cavity is used to form the outer shape of the side plate of the logistics box, and the extrusion plug can move in the extrusion channel. When the extrusion plug is pressed down, it can drive the inner cavity template to insert into the molten plastic in the appearance cavity, forming a hollow layer for the molten plastic. The inner cavity template and the appearance cavity form the structural shape of the side plate of the logistics box.

[0006] Preferably, a first cylinder is arranged on the support base, and the output end of the first cylinder is connected to the side wall of the movable mold. An injection molding machine is arranged on the top of the support base, and the output end of the barrel of the injection molding machine is communicated with the injection hole. The injection molding machine is used to heat the plastic raw material into a molten plastic with fluidity in the barrel and inject the molten plastic into the appearance cavity through the injection hole.

[0007] Preferably, the bottom of the movable mold is slidably connected to the top of the support base. A plurality of L-shaped grooves are opened on the side wall of the movable mold. A recycling chute is arranged on the other side wall of the movable mold. A plurality of fixing plates are arranged on the top of the movable mold. A sliding convex strip is connected to the side wall of the fixing plate. A second cylinder is also arranged on the top of the movable mold.

[0008] Preferably, the extrusion plug includes a sliding frame. The bottom of the sliding frame is connected to the inner cavity template. The sliding frame is movably sleeved on the fixing plate. A first sliding groove is arranged on the inner side wall of the sliding frame, and the first sliding groove is slidably matched with the sliding convex strip. The output end of the second cylinder is connected to the sliding frame. An inclined pressing plate is connected to the side wall of the sliding frame. The top surface and the bottom surface of the inclined pressing plate are set as mutually parallel inclined plane structures. A plurality of plastic discharging holes are opened in the inclined pressing plate from top to bottom, and the plastic discharging holes are used to discharge the redundant molten plastic in the appearance cavity.

[0009] Preferably, a second recycling chute is arranged on the side wall of the fixed mold. When the moving mold and the fixed mold are clamped, the first recycling chute and the second recycling chute are combined to form a plastic recycling channel.

[0010] Preferably, a sloping plate is arranged on the side wall of the fixed mold. The top of the sloping plate is of an inclined surface structure, and the inclination angle of the top of the sloping plate is the same as that of the top of the inclined pressing plate. By moving the extrusion plug upward in the extrusion channel, the top of the inclined pressing plate can be aligned with the top of the sloping plate; a pushing plate is arranged above the sloping plate. One side wall of the pushing plate is connected with a plurality of sliders and driving blocks. The bottom of the pushing plate is of an inclined surface structure and is in fit with the inclined surface of the top of the sloping plate. The other side wall of the pushing plate is connected with a pushing pull rod, and the end of the pushing pull rod is connected with a piston; a plurality of second sliding grooves and strip-shaped holes are formed in the upper side wall of the extrusion cavity. The sliders are slidably arranged in the second sliding grooves, and the driving blocks movably penetrate through the strip-shaped holes.

[0011] Preferably, a third cylinder and an air cylinder are further arranged on the top of the fixed mold; the output end of the third cylinder is connected with the driving block; the inner cavity of the air cylinder includes an air storage cavity and an air outlet cavity. The output end of the air storage cavity is communicated with the air outlet cavity. The pushing pull rod movably penetrates through the side wall of the air cylinder and extends into the air storage cavity. The piston is in sliding fit with the circumferential inner wall of the air storage cavity; wherein, the air outlet cavity is of a gradually shrinking slender channel structure, and the output end of the air outlet cavity is connected with an air spraying pipe, and the output end of the air spraying pipe is arranged above the second recycling chute.

[0012] Preferably, the bottom of the extrusion cavity is of an inclined surface structure, and the slope of the inclined surface structure is the same as that of the bottom inclined surface structure of the inclined pressing plate. A plurality of top holes are formed in the inclined surface structure at the bottom of the extrusion cavity. A plurality of L-shaped grooves II communicated with the bottoms of the top holes are formed in the lower end of the side wall of the fixed mold. A top material ventilation rod is movably arranged in the top holes, and the bottoms of the plurality of top material ventilation rods are connected through a lifting block; the top of the top material ventilation rod is of an inclined surface structure, and the slope of the inclined surface structure is the same as that of the inclined surface structure at the bottom of the extrusion cavity. A ventilation groove is formed in the side wall of the top material ventilation rod, and the ventilation groove is communicated with the L-shaped groove II; wherein, the lifting block can perform lifting activities. When the lifting block descends to the lowest position, the top of the top material ventilation rod and the top of the top hole form a planar structure, and the ventilation groove is located in the inner cavity of the top hole, so that a closed state is formed between the inner cavity of the top hole and the extrusion cavity; when the lifting block ascends to the highest position, the top of the top material ventilation rod penetrates through the plastic discharging hole of the inclined pressing plate to eject the plastic in the plastic discharging hole. At the same time, the ventilation groove is located above the top hole, so that a communicating state is formed between the inner cavity of the top hole and the extrusion cavity.

[0013] Preferably, a support plate is connected to the bottom of the fixed mold. A motor is arranged above the support plate. A lead screw is rotatably arranged between the top of the support plate and the bottom of the fixed mold. The output end of the motor is connected to a first gear. The bottom of the lead screw is connected to a second gear. The first gear is meshed with the second gear. A moving block is threadedly connected to the lead screw. The moving block is connected to the side wall of the lifting block. The lifting block is slidably arranged on the lower side wall of the fixed mold.

[0014] A molding method for an injection mold of a high impact-resistant and wear-resistant folding logistics box includes the following steps: S1. In the first-stage mold closing operation, the moving mold is driven by a first cylinder to slide on multiple guide rods, so that the moving mold and the fixed mold form a mold closing state. The inner mold cavity and the outer convex mold form an appearance cavity. An extrusion channel is formed between the upper end of the inner mold cavity and the extrusion cavity. S2. Injection molding operation. The plastic raw material is heated to a molten state by the barrel of an injection molding machine, and the molten plastic is injected into the appearance cavity through an injection hole until the appearance cavity is filled with the molten plastic. S3. In the second-stage mold closing operation, the carriage is driven by a second cylinder to move downward along the sliding rib, driving the inner cavity template to insert into the appearance cavity until the inclined pressing plate presses down on the bottom of the extrusion cavity. At this time, the inner cavity template and the appearance cavity form the structural shape of the side plate of the logistics box. During the process of the inner cavity template inserting into the appearance cavity, the molten plastic in the appearance cavity can be extruded. The extruded molten plastic can fully fill the outer convex mold. The excess molten plastic is discharged from the plastic discharge hole of the inclined pressing plate. S4. Remaining material cleaning operation. After the molten plastic is cooled and molded and before the mold is opened, first, the lifting block rises, driving multiple ejector vent rods to respectively insert upward from the top holes, penetrate the plastic discharge holes of the inclined pressing plate, and eject the solidified plastic in the plastic discharge holes until the lifting block rises to the highest position and stops. At this time, one end of the vent groove on the side wall of the ejector vent rod is communicated with the second L-shaped groove, and the other end is located in the plastic discharge hole of the inclined pressing plate above the top hole, preventing the remaining material on the top of the inclined pressing plate from entering the vent groove. Then, the carriage rises, separating the vent groove from the plastic discharge hole, and the inner cavity of the top hole is communicated with the extrusion cavity through the vent groove, preventing negative pressure from forming in the mold cavity and making it difficult for the carriage to rise. Until the top of the inclined pressing plate is aligned with the top of the inclined plate, the carriage stops moving. At this time, the plastic remaining material remains on the top of the inclined pressing plate. The plastic remaining material is pushed out by a push plate for collection and reuse. After the remaining material is cleaned, the moving mold and the fixed mold are opened, and the product is taken out.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. Through the clamping of the moving mold and the fixed mold in the present invention, the inner groove and the outer convex mold form an appearance cavity, which is only the outer surface shape of the side plate of the logistics box. Thus, the appearance cavity is similar to a directional notch with a relatively spacious interior, facilitating the rapid inflow of molten plastic. At this time, by injecting the molten plastic into the appearance cavity, the molten plastic can fill the entire appearance cavity while maintaining good fluidity. Then, by pressing down the extrusion plate, the inner cavity template is inserted into the molten plastic in the appearance cavity, forming a hollow layer for the molten plastic. Moreover, under the extrusion of the inner cavity template and in its state of good fluidity, the molten plastic can fully fill the grid-like channels of the entire outer convex mold, forming the outer grid structure of the side plate of the logistics box. After the molten plastic gradually cools, the side plate of the logistics box with a hollow layer is finally formed. By changing the traditional molding method of the injection mold and adopting the method of first injection molding and then shaping, the present invention greatly avoids the phenomenon that the molten plastic needs to flow through a relatively narrow cavity with many paths, which easily leads to local premature cooling and molding failure.

[0016] 2. In the present invention, the air cylinder three drives the driving block to move forward, and the driving block drives the pushing plate to move forward. The pushing plate pushes the excess plastic at the top of the inclined pressing plate forward, and the excess plastic is pushed into the plastic recycling channel for collection and reuse. When the air cylinder three pulls the driving block back, it drives the pushing plate to move back to its original position. The pushing plate drives the piston to move in the air storage cavity through the push rod. The piston compresses the air in the air storage cavity, causing the air to flow into the air outlet cavity. Since the air outlet cavity is a gradually shrinking slender channel structure, the cross-section of the air flow gradually shrinks. With the air flow rate unchanged and under the push of the piston, the air flow velocity increases. The rapidly flowing air is ejected from the air injection pipe to clean the small particle plastics that may remain on the plastic recycling channel, preventing the small particle plastics from falling into the formed side plate of the logistics box during mold opening and affecting the product quality. Through the push-and-pull action of the air cylinder three on the driving block, the pushing plate can be driven to push out the excess plastic, and the air cylinder can be driven to output rapidly flowing gas from the air injection pipe to clean the small particle plastics, effectively cleaning the excess plastic.

[0017] 3. In the present invention, by designing the ejector vent rod and controlling the position of the ejector vent rod by the lifting of the lifting block, when the lifting block descends to the lowest position, the top of the ejector vent rod and the top of the ejector hole form a planar structure. At this time, the vent groove is located in the inner cavity of the ejector hole, making the inner cavity of the ejector hole and the extrusion cavity in a closed state. In this state, the sealing state of the appearance cavity can be guaranteed. When injecting molten plastic into the appearance cavity, it is difficult for the molten plastic to enter the ejector hole. Moreover, as the inner cavity template is inserted into the molten plastic in the appearance cavity, the molten plastic is extruded and rises, and the excess molten plastic can smoothly discharge from the multiple plastic discharge holes of the inclined pressing plate and enter the top of the inclined pressing plate, ensuring the reliability of the injection process and the clamping process between the inner cavity template and the appearance cavity.

[0018] 4. The present invention designs a knockout vent rod. After the molten plastic cools and forms, the lifting block rises to the highest position, causing the top of the knockout vent rod to penetrate through the plastic discharge hole of the inclined pressing plate, and pushing out the plastic in the plastic discharge hole, solving the problem that it is difficult to clean the solidified plastic in the plastic discharge hole. As the carriage rises, it drives the inclined pressing plate to rise. During the rising process of the inclined pressing plate, the knockout vent rod always remains in the plastic discharge hole, keeping the excess plastic on the top of the inclined pressing plate all the time, avoiding the situation that small pieces of plastic fall through the plastic discharge hole. Moreover, the top of the ventilation groove is located above the top hole, forming a communication state between the inner cavity of the top hole and the extrusion cavity. The bottom of the ventilation groove is still connected to the second L-shaped groove. The connected first L-shaped groove and second L-shaped groove ensure the connection between the ventilation groove and the outside air, and further enable the appearance cavity to communicate with the outside air, making it difficult to form negative pressure in the appearance cavity, and solving the problem that it is difficult for the carriage to rise due to the easy generation of negative pressure in the appearance cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall structural schematic diagram of a high impact resistance and wear-resistant folding logistics box of the present invention; Figure 2 is the side plate structural schematic diagram of the logistics box of the present invention; Figure 3 is the overall structural schematic diagram of the injection mold of the present invention; Figure 4 is the combined mold state structural schematic diagram of the fixed mold and the moving mold of the present invention; Figure 5 is the split mold state structural schematic diagram of the fixed mold and the moving mold of the present invention; Figure 6 is the structural schematic diagram of the moving mold and the extrusion plug plate of the present invention; Figure 7 is the split structural schematic diagram of the moving mold and the extrusion plug plate of the present invention; Figure 8 is the structural schematic diagram of the extrusion plug plate of the present invention; Figure 9 is the structural schematic diagram of the fixed mold of the present invention; Figure 10 is the sectional structural schematic diagram of the air cylinder of the present invention; Figure 11 is the structural schematic diagram of the pushing plate of the present invention; Figure 12 is the structural schematic diagram of the top hole and the second L-shaped groove of the present invention; Figure 13 is the structural schematic diagram of the screw drive of the present invention; Figure 14 is the structural schematic diagram of the ventilation groove of the present invention; Figure 15 is the structural schematic diagram of the lifting block of the present invention; Figure 16 Schematic cross-sectional structure diagram of the moving mold and the fixed mold of the present invention in the mold closing state; Figure 17 Schematic cross-sectional structure diagram of the inner cavity template and the outer cavity of the present invention in the mold closing state; Figure 18 Schematic cross-sectional structure diagram of a use state of the ejector vent rod of the present invention.

[0020] Explanation of the reference numerals in the figure: 1, side plate of the logistics box; 2, support seat; 3, fixed mold; 5, guide rod; 4, moving mold; 6, extrusion insert; 201, cylinder one; 301, outer convex mold; 302, extrusion cavity; 303, injection hole; 304, recycling chute two; 305, inclined plate; 306, pushing plate; 307, slider; 308, push-pull rod; 309, piston; 310, driving block; 311, sliding groove two; 312, strip-shaped hole; 313, cylinder three; 314, air cylinder; 315, air storage cavity; 316, air outlet cavity; 317, air injection pipe; 318, top hole; 319, ejector vent rod; 320, lifting block; 321, L-shaped groove two; 322, support plate; 323, motor; 324, lead screw; 325, gear one; 326, gear two; 327, moving block; 328, ventilation groove; 401, inner cavity groove; 402, L-shaped groove one; 403, recycling chute one; 404, fixing plate; 405, sliding convex strip; 406, cylinder two; 601, inner cavity template; 602, sliding frame; 603, sliding groove one; 604, inclined pressing plate; 605, plastic discharging hole. Detailed implementation manner

[0021] Example 1, as Figures 1 to 18 shown, this embodiment provides an injection mold for a high-impact-resistant and wear-resistant folding logistics box, including a support seat 2, a fixed mold 3 and a moving mold 4. The fixed mold 3 is arranged on the top of the support seat 2, and the side wall of the fixed mold 3 is connected to the side wall of the support seat 2 through a plurality of guide rods 5. The moving mold 4 is movably arranged on the guide rods 5; Specifically, as Figure 9 shown, the side wall of the fixed mold 3 is provided with an outer convex mold 301. The outer convex mold 301 is composed of a plurality of protruding structures, and the channels between the plurality of protruding structures form a grid-like structure. The outer convex mold 301 is used to form the outer grid structure of the side plate 1 of the logistics box. An extrusion cavity 302 is opened on the side wall of the fixed mold 3, and an injection hole 303 is opened on the side wall of the extrusion cavity 302; Further, as Figure 6As shown, an inner mold cavity 401 is formed on the side wall of the moving mold 4. The inner mold cavity 401 is used to form the inner planar structure of the side plate 1 of the logistics box; the top of the inner mold cavity 401 extends to the top of the moving mold 4, and an extrusion plug plate 6 is movably arranged in the inner mold cavity 401; further, as Figure 8 shown, the extrusion plug plate 6 includes an inner cavity template 601, and the inner cavity template 601 is used to form the hollow layer of the side plate 1 of the logistics box; It should be noted that when the moving mold 4 is clamped with the fixed mold 3, the inner mold cavity 401 and the outer convex mold 301 form an appearance cavity, and the upper end of the inner mold cavity 401 and the extrusion cavity 302 form an extrusion channel; the appearance cavity is used to form the outer surface shape of the side plate 1 of the logistics box, and the extrusion plug plate 6 can move in the extrusion channel; when the extrusion plug plate 6 is pressed down, it can drive the inner cavity template 601 to insert into the molten plastic in the appearance cavity, forming a hollow layer for the molten plastic, and the inner cavity template 601 and the appearance cavity form the structural shape of the side plate 1 of the logistics box.

[0022] In the present invention, by clamping the moving mold 4 and the fixed mold 3, the inner mold cavity 401 and the outer convex mold 301 form an appearance cavity, and the appearance cavity is only the outer surface shape of the side plate 1 of the logistics box, so that the appearance cavity is similar to a directional notch and is relatively spacious inside, facilitating the rapid inflow of molten plastic. At this time, by injecting the molten plastic into the appearance cavity, the molten plastic can fill the entire appearance cavity while maintaining good fluidity. Then, by pressing down the extrusion plug plate 6, the inner cavity template 601 is inserted into the molten plastic in the appearance cavity to form a hollow layer for the molten plastic. Moreover, under the extrusion action of the inner cavity template 601, the molten plastic can fully fill the grid-like channels of the entire outer convex mold 301 in its state of good fluidity, forming the outer grid structure of the side plate 1 of the logistics box. When the molten plastic gradually cools, the side plate 1 of the logistics box with a hollow layer is finally formed. By changing the traditional molding method of the injection mold and adopting the method of first injection molding and then shaping, the present invention greatly avoids the phenomenon that the molten plastic needs to flow through a relatively narrow cavity with many paths, which is likely to cause local premature cooling and molding failure.

[0023] In the embodiment of the present invention, a first cylinder 201 is arranged on the support seat 2, and the output end of the first cylinder 201 is connected to the side wall of the moving mold 4; an injection molding machine is arranged on the top of the support seat 2. The injection molding machine is an existing technology in the example and will not be elaborated. The output end of the barrel of the injection molding machine is communicated with the injection hole 303. The injection molding machine is used to heat the plastic raw material into a fluid molten plastic in the barrel and inject the molten plastic into the appearance cavity through the injection hole 303.

[0024] In an embodiment of the present invention, the bottom of the moving mold 4 is slidably connected to the top of the support base 2. A chute is provided at the bottom of the moving mold 4, and corresponding sliders are arranged on the top of the support base 2. The moving mold 4 slides on the sliders at the top of the support base 2 through the chute at its bottom. A plurality of L-shaped grooves 402 are provided on the side wall of the moving mold 4, and a recycling chute 403 is arranged on the other side wall of the moving mold 4. A plurality of fixing plates 404 are arranged on the top of the moving mold 4, a sliding rib 405 is connected to the side wall of the fixing plate 404, and a cylinder two 406 is further arranged on the top of the moving mold 4.

[0025] As another embodiment of the present invention, the extrusion insert plate 6 includes a sliding frame 602. The bottom of the sliding frame 602 is connected to the inner cavity template 601. The sliding frame 602 is movably sleeved on the fixing plate 404. A sliding groove 603 is arranged on the inner side wall of the sliding frame 602, and the sliding groove 603 is slidably matched with the sliding rib 405. The output end of the cylinder two 406 is connected to the sliding frame 602. The lifting of the sliding frame 602 is controlled by the cylinder two 406, so as to control the insertion and separation of the inner cavity template 601 into and from the outer appearance cavity. An inclined pressing plate 604 is connected to the side wall of the sliding frame 602. The top surface and the bottom surface of the inclined pressing plate 604 are set as mutually parallel inclined plane structures. A plurality of plastic discharging holes 605 are provided in the inclined pressing plate 604 from top to bottom. The plastic discharging holes 605 are used to discharge the redundant molten plastic in the outer appearance cavity. When the sliding frame 602 drives the inner cavity template 601 to insert into the outer appearance cavity, as the sliding frame 602 descends, the air above the outer appearance cavity is squeezed out from the plurality of plastic discharging holes 605 of the inclined pressing plate 604. And, along with the molten plastic into which the inner cavity template 601 inserts into the outer appearance cavity, the molten plastic is squeezed and rises, that is, redundant molten plastic is generated. As the sliding frame 602 continues to press down, the redundant molten plastic will gradually be discharged from the plurality of plastic discharging holes 605 of the inclined pressing plate 604 and enter the top of the inclined pressing plate 604.

[0026] In an embodiment of the present invention, a recycling chute two 304 is arranged on the side wall of the fixed mold 3. When the moving mold 4 and the fixed mold 3 are clamped, the recycling chute one 403 and the recycling chute two 304 are combined to form a plastic recycling channel.

[0027] In an embodiment of the present invention, an inclined plate 305 is provided on the side wall of the fixed mold 3. The top of the inclined plate 305 is an inclined plane structure, and the inclination angle of the top of the inclined plate 305 is the same as the inclination angle of the top of the inclined pressing plate 604. By moving the extrusion insert plate 6 upward in the extrusion channel, the top of the inclined pressing plate 604 can be aligned with the top of the inclined plate 305 to form a channel for cleaning redundant plastic; Specifically, a pusher plate 306 is arranged above the inclined plate 305. A plurality of sliders 307 and driving blocks 310 are connected to one side wall of the pusher plate 306. The bottom of the pusher plate 306 is provided with an inclined surface structure and is fitted with the inclined surface at the top of the inclined plate 305. Another side wall of the pusher plate 306 is connected with a push-pull rod 308, and the end of the push-pull rod 308 is connected with a piston 309. A plurality of sliding grooves II 311 and strip holes 312 are formed in the upper side wall of the extrusion cavity 302. The sliders 307 are slidably arranged in the sliding grooves II 311, and the driving blocks 310 movably penetrate through the strip holes 312. Further, a cylinder III 313 and an air cylinder 314 are also arranged on the top of the fixed mold 3. The output end of the cylinder III 313 is connected with the driving block 310. An air inlet hole is formed in the side wall of the air cylinder 314. The inner cavity of the air cylinder 314 includes an air storage cavity 315 and an air outlet cavity 316. The output end of the air storage cavity 315 is communicated with the air outlet cavity 316. The push-pull rod 308 movably penetrates through the side wall of the air cylinder 314 and extends into the air storage cavity 315. The piston 309 is slidably matched with the circumferential inner wall of the air storage cavity 315. Among them, the air outlet cavity 316 is a gradually shrinking slender channel structure. The output end of the air outlet cavity 316 is connected with a jet pipe 317. The output end of the jet pipe 317 is arranged above the recycling chute II 304, and the output direction of the jet pipe 317 is aligned with the plastic recycling channel formed by the merger of the recycling chute I 403 and the recycling chute II 304. In the present invention, after the molten plastic is cooled and molded, the inner cavity template 601 is driven to leave the hollow layer of the formed side plate 1 of the logistics box by the rising of the carriage 602 until the carriage 602 rises to the top, so that the top of the inclined pressing plate 604 is aligned with the top of the inclined plate 305. Then, the cylinder III 313 is used to push the driving block 310 forward. The driving block 310 drives the pusher plate 306 to move forward. The pusher plate 306 pushes the redundant plastic at the top of the inclined pressing plate 604 forward and pushes the redundant plastic into the plastic recycling channel for collection and recycling. When the cylinder III 313 pulls the driving block 310 to move back, it drives the pusher plate 306 to move back to the reset position. When the pusher plate 306 moves back, the pusher plate 306 pushes the piston 309 to move in the air storage cavity 315 through the push-pull rod 308. The piston 309 compresses the air in the air storage cavity 315, so that the air flows into the air outlet cavity 316. Since the air outlet cavity 316 is a gradually shrinking slender channel structure, the cross-section of the air flow gradually shrinks. Under the condition that the air flow rate remains unchanged, driven by the piston 309, the air flow velocity is accelerated. The fast-flowing air is ejected from the jet pipe 317 to clean the small particle plastics that may remain on the plastic recycling channel, avoiding the small particle plastics from falling into the formed side plate 1 of the logistics box during mold opening and affecting the product quality. Through the pushing and pulling actions of the cylinder III 313 on the driving block 310, the pusher plate 306 can be driven to push out the redundant plastic, and the air cylinder 314 can be driven to output fast-flowing gas from the jet pipe 317 to clean the small particle plastics, effectively cleaning the redundant plastic.

[0028] In an embodiment of the present invention, the bottom of the extrusion cavity 302 is provided with an inclined surface structure, and the slope of the inclined surface structure is the same as that of the bottom inclined surface structure of the inclined pressing plate 604. The inclined surface structure at the bottom of the extrusion cavity 302 can guide the molten plastic injected from the injection hole 303 to flow into the appearance cavity, and at the same time prevent the molten plastic from staying in the extrusion cavity 302. A plurality of top holes 318 are formed in the inclined surface structure at the bottom of the extrusion cavity 302, and a plurality of L-shaped grooves II 321 communicating with the bottoms of the top holes 318 are formed in the lower end of the side wall of the fixed mold 3. When the moving mold 4 and the fixed mold 3 are clamped, the L-shaped groove I 402 and the L-shaped groove II 321 are in a communicating state, which can ensure that the L-shaped groove I 402 and the L-shaped groove II 321 in the communicating state are communicated with the outside air. A top material ventilation rod 319 is movably arranged in the top hole 318, and the bottoms of the plurality of top material ventilation rods 319 are connected through a lifting block 320; the top of the top material ventilation rod 319 is provided with an inclined surface structure, and the slope of the inclined surface structure is the same as that of the inclined surface structure at the bottom of the extrusion cavity 302. A ventilation groove 328 is formed in the side wall of the top material ventilation rod 319, and the ventilation groove 328 is communicated with the L-shaped groove II 321; Among them, the lifting block 320 can perform lifting activities. When the lifting block 320 descends to the lowest position, the top of the top material ventilation rod 319 and the top of the top hole 318 form a flat structure, and the ventilation groove 328 is located in the inner cavity of the top hole 318, so that a closed state is formed between the inner cavity of the top hole 318 and the extrusion cavity 302; when the lifting block 320 ascends to the highest position, the top of the top material ventilation rod 319 penetrates through the plastic discharge hole 605 of the inclined pressing plate 604 to eject the plastic in the plastic discharge hole 605. At the same time, the ventilation groove 328 is located above the top hole 318, so that a communicating state is formed between the inner cavity of the top hole 318 and the extrusion cavity 302.

[0029] In the present invention, by designing a knockout vent rod 319 and using the lifting of a lifting block 320 to control the position of the knockout vent rod 319, when the lifting block 320 descends to the lowest position, the top of the knockout vent rod 319 and the top of a knockout hole 318 form a planar structure. At this time, a vent groove 328 is located in the inner cavity of the knockout hole 318, so that a closed state is formed between the inner cavity of the knockout hole 318 and an extrusion cavity 302. In this state, when injecting molten plastic into an appearance cavity, it is difficult for the molten plastic to enter the knockout hole 318. And as the inner cavity template 601 is inserted into the molten plastic in the appearance cavity, the molten plastic is squeezed and rises, and the excess molten plastic can smoothly discharge through a plurality of plastic discharge holes 605 of an inclined pressing plate 604 and enter the top of the inclined pressing plate 604. When the molten plastic cools and solidifies, by lifting the lifting block 320 to the highest position, the top of the knockout vent rod 319 penetrates through the plastic discharge holes 605 of the inclined pressing plate 604 to eject the plastic in the plastic discharge holes 605, solving the problem that it is difficult to clean the solidified plastic in the plastic discharge holes 605. As a carriage 602 rises, it drives the inclined pressing plate 604 to rise. During the rising process of the inclined pressing plate 604, the knockout vent rod 319 always remains in the plastic discharge holes 605, so that the excess plastic always remains at the top of the inclined pressing plate 604, avoiding the situation where small pieces of plastic fall through the plastic discharge holes 605. Moreover, the top of the vent groove 328 is located above the knockout hole 318, so that a communicating state is formed between the inner cavity of the knockout hole 318 and the extrusion cavity 302. The bottom of the vent groove 328 is still connected to an L-shaped groove two 321. The L-shaped groove one 402 and the L-shaped groove two in the communicating state ensure the connection between the vent groove 328 and the outside air, and further enable the appearance cavity to communicate with the outside air, making it difficult to form a negative pressure in the appearance cavity and solving the problem that it is difficult for the carriage 602 to rise due to the easy generation of negative pressure in the appearance cavity.

[0030] As another embodiment of the present invention, a support plate 322 is connected to the bottom of a fixed mold 3. A motor 323 is arranged above the support plate 322. A lead screw 324 is rotatably arranged between the top of the support plate 322 and the bottom of the fixed mold 3. The output end of the motor 323 is connected to a gear one 325. The bottom of the lead screw 324 is connected to a gear two 326. The gear one 325 is meshed and connected with the gear two 326. A moving block 327 is threadedly connected to the lead screw 324. The moving block 327 is connected to the side wall of the lifting block 320. The lifting block 320 is slidably arranged on the lower side wall of the fixed mold 3. A chute is arranged on the side wall of the lifting block 320. A slider is arranged on the lower side wall of the fixed mold 3. The lifting block 320 slides on the slider through the chute. In the present invention, the motor 323 drives the gear one 325 to rotate, driving the gear two 326 to rotate, and further driving the lead screw 324 to rotate. By using the rotation of the lead screw 324 to drive the moving block 327 to move along the direction of the lead screw 324, the lifting of the lifting block 320 is controlled.

[0031] Embodiment two. This embodiment provides a molding method for an injection mold of a high impact-resistant and wear-resistant folding logistics box, including the following steps: S1. First-stage mold clamping operation: The moving mold 4 is driven by the cylinder 1 201 to slide on multiple guide rods 5, so that the moving mold 4 and the fixed mold 3 form a mold clamping state. The inner mold cavity 401 and the outer punch 301 form an appearance cavity, and the upper end of the inner mold cavity 401 and the extrusion cavity 302 form an extrusion channel. S2. Injection molding operation: The plastic raw material is heated to a molten state by the barrel of the injection molding machine, and the molten plastic is injected into the appearance cavity through the injection hole 303 until the appearance cavity is filled with the molten plastic. S3. Second-stage mold clamping operation: The carriage 602 is driven by the cylinder 2 406 to move downward along the sliding rib 405, driving the inner cavity template 601 to insert into the appearance cavity until the inclined pressing plate 604 presses down on the inner bottom of the extrusion cavity 302. At this time, the inner cavity template 601 and the appearance cavity form the structural shape of the side plate 1 of the logistics box. During the process of the inner cavity template 601 inserting into the appearance cavity, the molten plastic in the appearance cavity can be extruded. The extruded molten plastic can fully fill the outer punch 301, and the excess molten plastic is discharged from the plastic discharge hole 605 of the inclined pressing plate 604. S4. Remaining material cleaning operation: After the molten plastic is cooled and molded, before the mold opening operation, first, the lifting block 320 rises, driving the plurality of ejector vent rods 319 to respectively insert upward from the top holes 318, penetrate through the plastic discharge hole 605 of the inclined pressing plate 604, and eject the solidified plastic in the plastic discharge hole 605 until the lifting block 320 rises to the highest position and stops. At this time, one end of the vent groove 328 on the side wall of the ejector vent rod 319 is communicated with the L-shaped groove 2 321, and the other end is located in the plastic discharge hole 605 of the inclined pressing plate 604 above the top hole 318, preventing the remaining material on the top of the inclined pressing plate 604 from entering the vent groove 328. Then, the carriage 602 rises, separating the vent groove 328 from the plastic discharge hole 605, and the inner cavity of the top hole 318 and the extrusion cavity 302 are in a communicated state through the vent groove 328, preventing negative pressure from being formed in the mold cavity and making it difficult for the carriage 602 to rise. Until the top of the inclined pressing plate 604 and the top of the inclined plate 305 are aligned, the carriage 602 stops moving. At this time, the plastic remaining material remains on the top of the inclined pressing plate 604, and the plastic remaining material is pushed out by the push plate 306 for collection and reuse. After the remaining material is cleaned, the mold opening operation is performed to take out the product.

[0032] The embodiments disclosed in the present invention are preferred embodiments, but are 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 mold for a high impact and wear-resistant foldable logistics box, characterized in that: It includes a support seat, a fixed mold and a movable mold, wherein the fixed mold is arranged on the top of the support seat, the fixed mold is connected to the side wall of the support seat through a plurality of guide rods, and the movable mold is movably arranged on the guide rods; The side wall of the fixed mold is provided with an outer convex mold, and the outer convex mold is used to form the outer grid structure of the side plate of the logistics box; the side wall of the fixed mold is provided with an extrusion cavity, and the side wall of the extrusion cavity is provided with an injection hole; The side wall of the movable mold is provided with an inner groove, and the inner groove is used to form the inner plane structure of the side plate of the logistics box; the top of the inner groove extends to the top of the movable mold, and an extrusion insert is movably arranged in the inner groove; The extruded insert plate includes an inner cavity template, and the inner cavity template is used to form a hollow layer of the logistics box side plate; When the movable mold and the fixed mold are molded together, the inner groove and the outer punch form an appearance cavity, and the upper end of the inner groove and the extrusion cavity form an extrusion channel; The appearance cavity is used to form the outer shape of the side panel of the logistics box, and the extrusion plug can move in the extrusion channel; when the extrusion plug is pressed down, it can drive the inner cavity template to insert into the molten plastic in the appearance cavity to form a hollow layer for the molten plastic. The inner cavity template and the appearance cavity form the structural shape of the side panel of the logistics box.

2. The injection mold of a high impact and wear-resistant foldable logistics box according to claim 1, characterized in that: A cylinder 1 is arranged on the support seat, and the output end of the cylinder 1 is connected to the side wall of the movable mold; an injection molding machine is arranged on the top of the support seat, and the output end of the barrel of the injection molding machine is connected to the injection hole. The injection molding machine is used to heat the plastic raw material in the barrel into a molten plastic with fluidity, and inject the molten plastic into the appearance cavity through the injection hole.

3. The injection mold of a high impact and wear-resistant foldable logistics box according to claim 2, characterized in that: The bottom of the movable mold is slidably connected to the top of the support seat, the side wall of the movable mold is provided with a plurality of L-shaped grooves, the other side wall of the movable mold is provided with a return slide groove, a plurality of fixed plates are arranged on the top of the movable mold, the side walls of the fixed plates are connected with sliding convex strips, and a cylinder is also arranged on the top of the movable mold.

4. The injection mold of a high impact and wear-resistant foldable logistics box according to claim 3, characterized in that: The extrusion plug plate includes a slide, the bottom of the slide is connected to the inner cavity template, the slide is movably mounted on the fixed plate, the inner side wall of the slide is arranged with a sliding groove 1, the sliding groove 1 is slidably matched with the sliding convex strip, the output end of the second cylinder is connected to the slide, the side wall of the slide is connected with an inclined pressure plate, the top and bottom surfaces of the inclined pressure plate are set to be inclined structures parallel to each other, and the inclined pressure plate is opened with a plurality of plastic discharge holes from top to bottom, and the plastic discharge holes are used to discharge excess molten plastic in the appearance cavity.

5. The injection mold of a high impact and wear-resistant foldable logistics box according to claim 4, characterized in that: The side wall of the fixed mold is arranged with a second recycling chute. When the movable mold and the fixed mold are molded together, the first recycling chute and the second recycling chute are combined to form a plastic recycling channel.

6. The injection mold of a high impact and wear-resistant foldable logistics box according to claim 5, characterized in that: The fixed mold side wall is provided with an inclined plate, the top of the inclined plate is an inclined surface structure, the inclination angle of the top of the inclined plate is the same as the inclination angle of the top of the inclined pressing plate, and the top of the inclined pressing plate can be aligned with the top of the inclined plate by the extrusion plug plate moving upward in the extrusion channel; A push plate is arranged above the inclined plate, a side wall of the push plate is connected to a plurality of sliders and a driving block, the bottom of the push plate is set as an inclined surface structure and fits with the inclined surface of the top of the inclined plate, the other side wall of the push plate is connected to a push-pull rod, and the end of the push-pull rod is connected to a piston; The upper side wall of the extrusion cavity is provided with a plurality of sliding grooves 2 and strip holes, the sliding block is slidably arranged in the sliding grooves 2, and the driving block movably passes through the strip holes.

7. The injection mold of a high impact and wear-resistant foldable logistics box according to claim 6, characterized in that: The top of the fixed mold is also provided with a cylinder and an air cylinder; The third output end of the cylinder is connected to the driving block; The inner cavity of the gas cylinder includes an air storage cavity and an air outlet cavity, the output end of the air storage cavity is connected to the air outlet cavity, the push-pull rod movably penetrates the side wall of the gas cylinder and extends into the air storage cavity, and the piston is slidably matched with the circumferential inner wall of the air storage cavity; The air outlet cavity is a gradually shrinking elongated channel structure, the output end of the air outlet cavity is connected to an air jet pipe, and the output end of the air jet pipe is arranged above the second recycling chute.

8. The injection mold of a high impact and wear-resistant foldable logistics box according to claim 7, characterized in that: The bottom of the extrusion chamber is set as an inclined surface structure, and the inclination of the inclined surface structure is consistent with the inclination of the bottom inclined surface structure of the inclined pressing plate. A plurality of top holes are opened on the inclined surface structure at the bottom of the extrusion chamber, and a plurality of L-shaped grooves connected to the bottom of the top holes are opened at the lower end of the fixed mold side wall. A top material ventilation rod is movably arranged in the top hole, and the bottoms of the plurality of top material ventilation rods are connected by a lifting block. The top of the ejector vent rod is configured as an inclined surface structure, and the inclination of the inclined surface structure is consistent with the inclination of the inclined surface structure at the bottom of the extrusion chamber. A vent groove is provided on the side wall of the ejector vent rod, and the vent groove is connected to the second L-shaped groove; Among them, the lifting block can perform lifting activities. When the lifting block descends to the lowest position, the top of the ejecting vent rod and the top of the top hole form a planar structure, and the vent groove is located in the inner cavity of the top hole, so that a closed state is formed between the inner cavity of the top hole and the extrusion cavity; when the lifting block rises to the highest position, the top of the ejecting vent rod passes through the plastic discharge hole of the inclined pressing plate to eject the plastic in the plastic discharge hole. At the same time, the vent groove is located above the top hole, so that a connected state is formed between the inner cavity of the top hole and the extrusion cavity.

9. The injection mold of a high impact and wear-resistant foldable logistics box according to claim 8, characterized in that: The bottom of the fixed mold is connected to a support plate, a motor is arranged above the support plate, a screw is rotatably arranged between the top of the support plate and the bottom of the fixed mold, the output end of the motor is connected to gear 1, the bottom of the screw is connected to gear 2, the gear 1 is meshed with the gear 2, a moving block is threadedly connected to the screw, the moving block is connected to the side wall of the lifting block, and the lifting block is slidably arranged on the lower side wall of the fixed mold.

10. The molding method of the injection mold of the high impact-resistant and wear-resistant foldable logistics box according to claim 9, characterized in that: The following steps are involved: S1, one-stage mold closing operation, the movable mold is driven by cylinder 1 to slide on multiple guide rods, so that the movable mold and the fixed mold are in a mold closing state, the inner groove and the outer punch form an appearance cavity, and the upper end of the inner groove and the extrusion cavity form an extrusion channel; S2, injection molding operation, heating the plastic raw material to a molten state through the barrel of the injection molding machine, and injecting the molten plastic into the appearance cavity through the injection hole until the appearance cavity is filled with the molten plastic; S3, two-stage mold closing operation, the slide is driven by the second cylinder to move downward along the sliding convex strip, driving the inner cavity template to be inserted into the outer cavity until the inclined pressing plate is pressed down on the bottom of the extrusion cavity. At this time, the inner cavity template and the outer cavity form the structural shape of the logistics box side plate. During the insertion of the inner cavity template into the outer cavity, the molten plastic in the outer cavity can be squeezed out. The squeezed molten plastic can fully fill the outer punch, and the excess molten plastic is discharged from the plastic discharge hole of the inclined pressing plate; S4, residual material cleaning operation, after the molten plastic is cooled and formed, before the mold opening operation is carried out, the lifting block is first raised to drive multiple ejector vent rods to be inserted upward from the top hole respectively, and penetrate the plastic discharge hole of the inclined pressing plate to eject the solidified plastic in the plastic discharge hole until the lifting block rises to the highest position and stops. At this time, one end of the vent groove on the side wall of the ejector vent rod is connected with the L-shaped groove 2, and the other end is located in the plastic discharge hole of the inclined pressing plate above the top hole, so as to prevent the residual material on the top of the inclined pressing plate from entering the vent groove, and then the slide is raised to separate the vent groove from the plastic discharge hole, and the inner cavity of the top hole and the extrusion cavity are connected through the vent groove to prevent the formation of negative pressure in the mold cavity, which makes it difficult for the slide to rise, until the top of the inclined pressing plate is aligned with the top of the inclined plate, and the slide stops moving. At this time, the residual plastic material is retained on the top of the inclined pressing plate, and the residual plastic material is pushed out by the push plate for collection and reuse. After the residual material cleaning is completed, the movable mold and the fixed mold are opened to take out the product.

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