Segmented core-pulling structure of long socket bend injection mold

Abstract

The utility model provides a sectional core-pulling structure of long bell and elbow injection mold belongs to mould technical field. It solved how to reduce the problem of the rate of waste. In the sectional core-pulling structure of long bell and elbow injection mold, the mold includes core and movable plate with recess, the recess long strip is curved and both ends penetrate movable plate side wall, the core includes two sliding connections in recess, and the side core body of end portion is abutted, and two root stretch into recess, and the inclined ejector rod of end portion is abutted and is slidingly connected with side core body, the core-pulling structure includes movable plate side wall corresponding to the both ends of recess and is equipped with support, the support is equipped with cylinder, the support sliding connection and the sliding plate of cylinder drive end fixed link, and the side core body is fixed to the sliding plate, and the one end of inclined ejector rod passes through the sliding plate, and the support is hinged to the guide block, and the other end of inclined ejector rod is fixedly connected with it, and the cylinder pulls the sliding plate and can pull the side core body, and the sliding plate can also push the guide block and rotate and make inclined ejector rod along the side core body side wall and pull out. The sectional core-pulling structure of long bell and elbow injection mold can reduce the rate of waste.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to a segmented core-pulling structure for a long socket elbow injection mold. Background Technology

[0002] Injection molds are tools used in existing technology to produce plastic products. Specifically, they are made by injecting molten material under high pressure into a mold cavity, and the product is obtained after the material cools and solidifies. In terms of the type of product being molded, existing injection molds can be divided into many different types.

[0003] For commonly used elbow pipe fitting molds, such as the linear rack core-pulling mechanism for a plastic pipe bending mold disclosed in Chinese Patent (Authorization Announcement No.: CN202412535U), the mold has a lower cavity and a core. A support plate is installed at the bottom of the lower cavity, and the support plate is mounted on the mold foot, which is mounted on a base plate. The core includes an elbow core and a straight core. A guide post is installed at the outer end of the elbow core. A bracket is installed on one side of the support plate. The guide post passes through the straight core and connects to the bracket. The key feature is that the outer end of the straight core is connected to an outer slider. The guide post passes through the outer slider. A linear rack is installed at the bottom of the outer slider. A hydraulic motor is installed at the bottom of the bracket. A gear is installed on the rotating shaft of the hydraulic motor, and the gear meshes with the linear rack. This is in conjunction with paragraph 0009 of the prior art specification and the appendix. Figure 1-2 It can be seen that the comparative document uses a hydraulic motor as the driving source, and through the cooperation of a linear rack and a gear on the hydraulic motor, it controls the outer slider to slide along the axial direction of the guide post, thereby enabling the outer slider to pull out the linear core and the elbow core together.

[0004] Due to the shape of the bent core and the end of the molded product, the outer wall of the bent core will obviously interfere violently with the end of the molded product during the actual core pulling process. This will cause the end of the molded product to deform or even crack due to excessive compression, resulting in a high scrap rate. Summary of the Invention

[0005] The purpose of this utility model is to address the aforementioned problems in existing technologies by proposing a segmented core-pulling structure for injection molds of long socket elbows. The technical problem to be solved by this utility model is: how to reduce the scrap rate in product manufacturing.

[0006] The objective of this utility model can be achieved through the following technical solution: a segmented core-pulling structure for a long socket elbow injection mold, the long socket elbow injection mold including a core and a movable template with a groove, the groove being elongated and curved, and both ends of the groove penetrating the side wall of the movable template, characterized in that the core includes two side core bodies slidably connected within the groove and abutting at their ends, and two inclined ejector rods extending into the groove and abutting at their ends, and each of the inclined ejector rods is slidably connected to the corresponding side core body, the segmented core-pulling structure including a core fixed to the side wall of the movable template and corresponding to the core body. The structure includes brackets at both ends of the groove and cylinders fixed on each bracket. Each bracket has a sliding plate connected to and fixed to the driving end of the cylinder. Each side core is fixed on the corresponding sliding plate, and one end of each inclined push rod passes through the corresponding sliding plate. The segmented core-pulling structure also includes a guide block hinged to the bracket. The other end of each inclined push rod is fixed to the corresponding guide block. The cylinder can pull the sliding plate to slide, causing the side core to be pulled outward. The sliding plate can push the guide block to rotate, causing the inclined push rod to be pulled outward along the side wall of the side core.

[0007] The working principle of the segmented core-pulling structure of this long socket elbow injection mold is as follows: After the injection molding is completed and the product is shaped, and in the mold-open state, a cylinder is used as the driving source to pull the slide plate backward on the support. At this time, the side cores fixed on the slide plate can retract with the slide plate, so that the main core is pulled out of the product first relative to the inclined ejector. After the slide plate slides backward a certain distance, all the side cores have been pulled out of the product. At this time, the cylinder continues to work to pull the slide plate backward. In this state, the slide plate can push the guide block to rotate. At this time, the guide block is driven to swing around the hinge, so that the guide block drives the inclined ejector to move. Since the movement of the guide block is a swinging motion, the inclined ejector connected to the guide block will also move at a certain angle with the rotation of the hinge plate. The oscillation of the angled ejector rod ensures that it remains in contact with the side wall of the side core. Furthermore, the guide block pulls the angled ejector rod backward during the oscillation, thus removing it from the product. Compared to existing technologies, this application first assembles a complete core structure using two angled ejector rods and two side cores. Then, using a cylinder as the drive end, the side core and angled ejector rods are sequentially pulled outward through the cooperation of the sliding plate and side core, and the angled ejector rod and guide block. That is, the side core is pulled out first, and then the angled ejector rod is pulled out through the cooperation of the sliding plate and guide block, ensuring a smooth core-pulling process. This also avoids excessive interference between the core and the inner wall of the product during core-pulling operations, which can cause deformation or even cracks in the inner wall of the product, effectively reducing the scrap rate.

[0008] In the segmented core-pulling structure of the aforementioned long-socket elbow injection mold, each bracket includes two long rods and a plate fixed to one end of the two rods. The other ends of the two rods are fixed to the outer wall of the moving template. The cylinder is fixed to the plate, and the sliding plate is slidably connected between the two rods. Each sliding plate is fixed with a positioning plate. The outer end of the side core is pressed against the sliding plate by the positioning plate, and the inclined push rod passes through the positioning plate. Through this arrangement, the two rods guide the sliding plate, and the plate acts as a carrier to stably support the cylinder, thereby ensuring accurate core-pulling direction. Furthermore, by fixing the positioning plate to the side wall of the sliding plate, and with the cooperation of the positioning plate and the sliding plate, the side core is pressed, ensuring stable installation while allowing the side core to be detached.

[0009] In the segmented core-pulling structure of the aforementioned long socket elbow injection mold, each of the positioning plates has a core-through opening. The core-through opening penetrates both sides of the positioning plate, and the side core and the inclined ejector rod pass through the core-through opening together. A limiting groove is formed on the inner wall of the port of the core-through opening facing away from the moving template. A limiting protrusion is formed on the outer side wall of the side core, and the limiting protrusion is embedded in the limiting groove. This design prevents interference between the inclined ejector plate and the positioning plate, ensuring the inclined ejector rod can be properly positioned. Furthermore, the limiting groove structure in the core-through opening and the limiting protrusion on the outer side wall of the side core cooperate to allow the side core to be embedded and positioned in the core-through opening. After the positioning plate is fixed to the sliding plate, the side core can be pressed and positioned on the sliding plate.

[0010] In the segmented core-pulling structure of the aforementioned long socket elbow injection mold, positioning seats are fixed on adjacent rods of both sets of brackets, and guide blocks are hinged to each positioning seat. This arrangement uses the positioning seats as hinged support points to avoid interference between the arrangement of the guide blocks and the rods.

[0011] In the segmented core-pulling structure of the aforementioned long socket elbow injection mold, each plate is slidably connected to a reset rod along the axial direction of the inclined ejector rod. The front end of the reset rod has a column head that abuts against the guide block. A spring is sleeved on the reset rod, and the spring elastically acts between the column head and the plate surface. The reset rod and the spring cooperate to form a reset structure. After core pulling is completed and before the next injection, the cylinder can drive the slide plate forward to re-embed the side core into the groove. When the slide plate moves forward, the force acting on the guide block disappears. At this time, the spring sleeved on the reset rod can push the column head with the side of the plate as the fulcrum, so that the reset rod pushes the guide block to rotate back to its original position. During this process, the inclined ejector rod, which is fixed to the guide block, can be driven by the guide block to pass through the core opening and extend into the groove.

[0012] In the segmented core-pulling structure of the aforementioned long socket elbow injection mold, a strip-shaped limiting groove is provided on the side wall of the guide block. The column head is embedded in the limiting groove and abuts against the bottom wall of the limiting groove. This ensures a tight fit between the column head of the reset rod and the guide block, preventing slippage that could cause the reset function of the guide block to fail.

[0013] In the segmented core-pulling structure of the aforementioned long-socket elbow injection mold, each of the side cores has a wedge-shaped tenon along its length on its sidewall, and each of the inclined ejector pins has a wedge-shaped mortise along its length on its sidewall. Each inclined ejector pin and its corresponding side core are slidably connected through the tenon and mortise. This design allows the side core and the inclined ejector pin to mutually restrain each other during sliding, effectively ensuring that the core-pulling direction remains unchanged.

[0014] Compared with existing technologies, the segmented core-pulling structure of this long socket elbow injection mold has the following advantages: by dividing the complete core into two side cores and two inclined ejector rods, and each side core is slidably connected to one inclined ejector rod, the cylinder is used as the driving source to pull the slide plate. The slide plate pulls the corresponding side core, so that the side core is pulled out relative to the inclined ejector rod first. Then, the slide plate pushes the guide block to pull out the inclined ejector rod later. This avoids the excessive interference between the core and the inner wall of the product during the core-pulling operation in existing technologies, which can cause deformation or even cracks in the inner wall of the product, and effectively reduces the scrap rate of the product. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the segmented core-pulling structure of the injection mold for the long socket elbow.

[0016] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0017] Figure 3 This is a schematic diagram of the support structure.

[0018] Figure 4 It is a sectional view of the skateboard, positioning plate, and core, along with enlarged views of some parts.

[0019] Figure 5 This is a structural diagram of the positioning plate.

[0020] Figure 6 This is a structural schematic diagram of any one of the side cores.

[0021] Figure 7 This is a structural diagram of any inclined top rod.

[0022] In the diagram, 1 is the core; 11 is the side core; 111 is the limiting protrusion; 112 is the tenon; 12 is the inclined push rod; 121 is the tenon groove; 2 is the moving template; 21 is the groove; 3 is the bracket; 31 is the cylinder; 32 is the sliding plate; 321 is the positioning plate; 3211 is the core opening; 32111 is the limiting groove; 33 is the guide block; 331 is the limiting groove; 34 is the rod; 341 is the positioning seat; 35 is the plate; 351 is the reset rod; 3511 is the column head; and 3512 is the spring. Detailed Implementation

[0023] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0024] like Figure 1 and Figure 2 As shown, in the segmented core-pulling structure of this long socket elbow injection mold, the long socket elbow injection mold includes a moving template 2 and a core 1. The moving template 2 is specifically a square plate, and a curved groove 21 is formed on the moving template 2, with both ends penetrating the side wall of the moving template 2. This groove 21 is used to cooperate with the fixed template and the core 1 in the mold-closed state to form a cavity. Specifically, the curved shape can be L-shaped or V-shaped, etc. The core 1 specifically includes two side core bodies 11 and two inclined ejector rods 12 that are slidably connected in the groove 21 along its length. The inner ends of the two side core bodies 11 abut against each other, and the inner ends of the two inclined ejector rods 12 abut against each other. Thus, the two side core bodies 11 and the two inclined ejector rods 12 cooperate to form the completed core 1. Simply put, it can be regarded as splitting the complete core 1 into four parts, where the side core bodies 11 and the inclined ejector rods 12 located at the same end are slidably connected. Figure 6 and Figure 7 On the side wall of the side core 11, tenons 112 are formed along the length direction and extend to the edges of both ends. On the side wall of the inclined top rod 12, mortises 121 are formed along the length direction and penetrate both ends. Both tenons 112 and mortises 121 are wedge-shaped grooves. In simple terms, the side core 11 and the inclined top rod 12 located at the same end are a group, and the side core 11 and the inclined top rod 12 of the same group are slidably connected by the cooperation of tenons 112 and mortises 121, so that the side core 11 and the inclined top rod 12 of the same group can achieve radial limiting between each other.

[0025] Combination Figure 3-5On the side wall of the moving template 2, brackets 3 are installed at both ends of the groove 21. Each bracket 3 includes two long rods 34 and a plate 35 fixed to one end of the two rods 34. The other ends of the two rods 34 are fixed to the side wall of the moving template 2 by screws. A clearance notch is provided on the plate 35. A cylinder 31 is installed on each bracket 3. Specifically, the main body of the cylinder 31 is fixed on the plate 35 and the drive shaft is set to pass through the clearance notch on the plate 35. An L-shaped plate 32 is slidably connected to each bracket 3. A positioning plate 321 is fixed on one side of the plate 32 by bolts. A slot is opened on the other edge of the plate 32, and the drive shaft of the cylinder 31 is engaged in the slot.

[0026] Each side core 11 has a limiting protrusion 111 on its outer end sidewall. Each positioning plate 321 has a core-passing opening 3211 corresponding to the side core 11 and the inclined push rod 12. Each sliding plate 32 has a clearance opening that is directly opposite to the core-passing opening 3211. The side core 11 and the inclined push rod 12 of the same group pass through the corresponding clearance opening and core-passing opening 3211. Next, a limiting groove 32111 is opened on the inner sidewall of the end of each core-passing opening 3211 facing away from the moving template 2. After the side core 11 passes through the corresponding core-passing opening 3211, it is embedded into the limiting groove 32111 through the limiting protrusion 111. Through the fixed cooperation between the positioning plate 321 and the sliding plate 32, the side core 11 is pressed onto the sliding plate 32 by the positioning plate 321.

[0027] In the two sets of brackets 3, positioning seats 341 are fixed on the outer side walls of the middle of two adjacent rods 34. Each positioning seat 341 is vertically hinged with a guide block 33. The rear end of each inclined push rod 12 passes through the clearance opening and is engaged with a snap-fit ​​groove opened on one side wall of the guide block 33. Based on the above structure, the plate 35 of the bracket 3 is provided with guide holes that penetrate its two sides. A long strip-shaped reset rod 351 is slidably connected in the guide holes. The front end of the reset rod 351 has a column head 3511. The outer diameter of 11 is larger than the outer diameter of the reset rod 351. A long strip-shaped limiting groove 331 is provided on the other side wall of the guide block 33. The column head 3511 at the front end of the guide rod is embedded in the limiting groove 331 and abuts against the bottom wall of the limiting groove 331. Next, a spring 3512 is provided on the guide rod. One end of the spring 3512 abuts against the plate 35, and the other end abuts against the column head 3511. Under the elastic action of the spring 3512, the column head 3511 has the ability to move forward and abut against the bottom wall of the limiting groove 331.

[0028] Operating principle: After injection molding is completed and fully cooled, the cylinders 31 on the two supports 3 are activated, using the drive shaft to pull the corresponding slide plates 32 to slide relative to each other along the length of the two rods 34. This causes the slide plates 32 and the positioning plate 321 to pull the corresponding side cores 11 backward relative to the inclined push rod 12. With the cooperation of the tenon 112 and the mortise 121, the extraction direction of the side cores 11 is maintained until the two side cores 11 are completely extracted from the molded product. At this time, the cylinders 31 continue the above stroke. In this state, the slide plates 32 and the guide blocks 33... The slide plate 32 is already in a state of mutual contact. When the slide plate 32 continues to move backward, the slide plate 32 can push the guide plate to rotate around the hinge. Thus, the hinge plate drives the corresponding inclined ejector rod 12 to move. It is worth noting that when the guide block 33 rotates around the hinge, it can pull the inclined ejector rod 12 to make it close to the corresponding side core 11. Secondly, it can also make each inclined ejector rod 12 be continuously pulled outward until it is separated from the end of the product. In this state, the core pulling work at both ends of the product is completed. The demolding work can be completed simply by pushing the product out of the groove 21. After this, the mold needs to be prepared for the next injection molding. At this time, the cylinder 31 needs to control the drive shaft to extend forward, so that the corresponding side core 11 is pushed back into the groove 21 by the cooperation of the slide plate 32 and the positioning plate 321. In this state, the cylinder 31 will not generate any driving force on the reset rod 351. That is to say, the reset action of the inclined ejector rod 12 cannot be achieved by the drive of the cylinder 31. However, in actual operation, when the slide plate 32 moves forward, the force acting on the guide block 33 fails. At this time, the spring 3512 can push the column head 3511 with the plate surface of the plate 35 as support, thereby passing through the reset rod 3511. 51 drives the guide block 33 to rotate around the hinge to reset, thereby causing the guide block 33 to drive the inclined push rod 12 to perform a reset action. It should be noted that although the guide block 33 achieves the extraction action of the inclined push rod 12 by rotating around the hinge, the actual extraction distance of the inclined push rod 12 is relatively short. Therefore, there will be no interference between the inclined push rod 12 and the side core 11, the core through port 3211, and the clearance port. Furthermore, the rotation range of the guide block 33 is only between 30° and 45°, which will not cause the post head 3511 of the reset rod 351 to detach from the bottom wall of the limiting groove 331.

[0029] Based on the above solution, core pulling at both ends of the same product requires the cooperation of two adjacent sets of brackets 3 and the various components on the brackets 3. Given sufficient space on the moving template 2, as many grooves 21 as possible can be created, and the brackets 3 can be arranged accordingly, such as... Figure 1As shown, four grooves 21 are actually opened on the surface of the moving template 2, and brackets 3 are installed on the four side walls of the moving template 2. Each bracket 3 and the component installed on the bracket 3 are used to perform core pulling work on one end of the product in two grooves 21, thereby achieving the advantage of producing more products in one mold opening, which greatly improves the production efficiency of the mold.

[0030] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0031] Although this document frequently uses terms such as core 1, side core 11, limiting protrusion 111, tenon 112, inclined push rod 12, tenon groove 121, moving template 2, groove 21, bracket 3, cylinder 31, sliding plate 32, positioning plate 321, core through opening 3211, limiting groove 32111, guide block 33, limiting groove 331, rod 34, positioning seat 341, plate 35, reset rod 351, column head 3511, and spring 3512, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A segmented core-pulling structure for an injection mold of a long socket elbow, the injection mold of the long socket elbow comprising a core (1) and a movable template (2) having a groove (21), wherein the groove (21) is elongated and curved, and both ends of the groove (21) penetrate the sidewall of the movable template (2), characterized in that, The core (1) includes two side core bodies (11) slidably connected in the groove (21) and abutting each other at their ends, and two inclined push rods (12) extending into the groove (21) and abutting each other at their ends. Each inclined push rod (12) is slidably connected to the corresponding side core body (11). The segmented core-pulling structure includes a bracket (3) fixed on the side wall of the moving template (2) and provided at the two ends of the groove (21), and a cylinder (31) fixed on each bracket (3). Each bracket (3) is slidably connected to a sliding plate (32) that is fixed to the driving end of the cylinder (31). The side core (11) is fixed on the corresponding slide plate (32), and one end of each of the inclined push rods (12) passes through the corresponding slide plate (32). The segmented core-pulling structure also includes a guide block (33) hinged to the bracket (3). The other end of each of the inclined push rods (12) is fixedly connected to the corresponding guide block (33). The cylinder (31) can pull the slide plate (32) to slide, causing the side core (11) to be pulled outward. The slide plate (32) can push the guide block (33) to rotate, causing the inclined push rod (12) to be pulled outward along the side wall of the side core (11).

2. The segmented core-pulling structure of the injection mold for the long socket elbow according to claim 1, characterized in that, Each of the brackets (3) includes two long rods (34) and a plate (35) fixed to one end of the two rods (34). The other end of the two rods (34) is fixed to the outer wall of the moving template (2). The cylinder (31) is fixed on the plate (35). The slide plate (32) is slidably connected between the two rods (34). Each slide plate (32) is fixed with a positioning plate (321). The outer end of the side core (11) is pressed against the slide plate (32) by the positioning plate (321). The inclined top rod (12) passes through the positioning plate (321).

3. The segmented core-pulling structure of the injection mold for the long socket elbow according to claim 1 or 2, characterized in that, Each of the positioning plates (321) is provided with a through-hole (3211). The through-hole (3211) is provided through both sides of the positioning plate (321). The side core (11) and the inclined top rod (12) are together inserted into the through-hole (3211). A limiting groove (32111) is provided on the inner wall of the through-hole (3211) facing away from the moving template (2). The outer end side wall of the side core (11) has a limiting protrusion (111), which is embedded in the limiting groove (32111).

4. The segmented core-pulling structure of the injection mold for the long socket elbow according to claim 2, characterized in that, Each of the two sets of brackets (3) has a positioning seat (341) fixed on the adjacent rod (34), and each positioning seat (341) has a guide block (33) hinged to it.

5. The segmented core-pulling structure of the injection mold for the long socket elbow according to claim 2 or 4, characterized in that, Each of the plates (35) is slidably connected to a reset rod (351) along the axial direction of the inclined rod (12). The front end of the reset rod (351) has a column head (3511) that abuts against the guide block (33). The reset rod (351) is fitted with a spring (3512), which elastically acts between the column head (3511) and the plate surface of the plate (35).

6. The segmented core-pulling structure of the injection mold for the long socket elbow according to claim 5, characterized in that, The guide block (33) has a strip-shaped limiting groove (331) on its side wall, and the column head (3511) is embedded in the limiting groove (331) and abuts against the bottom wall of the limiting groove (331).

7. The segmented core-pulling structure of the injection mold for the long socket elbow according to claim 6, characterized in that, Each of the side cores (11) has a wedge-shaped tenon (112) along the length direction on its side wall, and each of the inclined push rods (12) has a wedge-shaped mortise (121) along the length direction on its side wall. Each of the inclined push rods (12) and the corresponding side core (11) are slidably connected by the tenon (112) and the mortise (121).

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