U-bend tube injection mold with insert

Abstract

The application relates to a U-shaped bent pipe injection mold with an insert, which comprises a fixed mold, a movable mold, an insert and a positioning piece. The fixed mold comprises a fixed mold fixed plate, a fixed mold base plate and a mold cavity plate which are sequentially and fixedly arranged. The positioning piece comprises a core-pulling rod, a driving piece one, a driving piece two, a moving rod, at least one locking block and at least two positioning blocks. The core-pulling rod is fixedly arranged in the mold cavity plate, the positioning blocks are fixed on the top wall of the forming cavity of the mold cavity plate, two positioning grooves are arranged on the top surface of the insert, and the two positioning blocks are in interference fit with the two positioning grooves. The circumferential inner wall of the insert is provided with a convex ring in interference fit with the core-pulling rod. The driving piece one drives the moving rod to slide in the core-pulling rod, the driving piece two drives the locking block to slide on the moving rod, and a locking groove in cooperation with the locking block is arranged on the inner wall of the convex ring. By changing the position of the locking block, the position of the insert in the mold opening direction is changed, the positioning of different positions of the insert is realized, and the bent pipes with different states of the insert can be conveniently formed.

Description

Technical Field

[0001] This invention relates to the field of molds, and in particular to a U-shaped bend injection mold with inserts. Background Technology

[0002] Insert injection molding is a one-piece molding process in which inserts (usually metal, fiber or other prefabricated parts) are pre-placed in an injection mold, and then the inserts are firmly bonded to the plastic after molten plastic is injected and cooled to solidify.

[0003] bends, such as Figure 1 As shown, insert 3 needs to be integrally molded at the inlet of bend 8. For example... Figure 2 As shown, the insert 3 is formed in two states: After the insert 3 shown in Figure A is integrally formed with the bend 8, it directly serves as the inner wall of the bend 8 inlet, serving both functional and structural support purposes; The insert 3 shown in Figure B is similar to a sheath structure, mainly used to enhance the structural strength of the bend 8 inlet, while the bend 8 inlet itself can be reliably connected to other pipes through a hot-melt process.

[0004] When forming two types of bent pipes with different insert states, different positioning components are usually required to fix the position of the inserts. In actual production, if two sets of molds equipped with different positioning components are used for production, the mold development cost will be significantly increased; if the same set of molds is used and the positioning components are replaced by disassembling the mold to achieve the production of different bent pipes, the disassembly and assembly will be time-consuming and the production efficiency will be low. Summary of the Invention

[0005] To facilitate the molding of bent pipes with different insert states, this application provides a U-shaped bent pipe injection mold with inserts.

[0006] The technical solution of the U-shaped bend injection mold with insert provided in this application is as follows:

[0007] A U-shaped bend injection mold with an insert includes a fixed mold, a moving mold, an insert, and a positioning element disposed on the fixed mold to limit the position of the insert. The fixed mold includes a fixed mold fixing plate, a fixed mold base plate, and a mold cavity plate that are fixedly disposed in sequence. The positioning element includes a core-pulling rod, a first driving element, a second driving element, an adaptive element, a moving rod, at least one locking block, and at least two positioning blocks.

[0008] The core-pulling rod is fixedly arranged in the mold cavity plate, the positioning blocks are fixedly arranged on the inner top wall of the forming cavity of the mold cavity plate in the direction parallel to the opening and closing of the mold, two positioning blocks are symmetrically arranged on the two sides of the core-pulling rod respectively, two positioning grooves are arranged on the top surface of the insert, and the two positioning blocks are in interference fit with the two positioning grooves respectively; a gap is left between the inner wall of the insert and the core-pulling rod, and a convex ring is coaxially integrally formed on the circumferential inner wall of the insert; the convex ring is sleeved on the core-pulling rod and is in interference fit with the core-pulling rod.

[0009] The first sliding groove is arranged in the core-pulling rod, the driving member one drives the moving rod to slide in the first sliding groove in the direction of the opening and closing of the mold, the locking block slides on the moving rod in the direction perpendicular to the opening and closing of the mold, the driving member two drives the locking block to move, the movable groove for the locking block to move is arranged on the side wall of the first sliding groove towards the side of the protruding block, the locking groove matched with the locking block is arranged on the inner wall of the convex ring, and the self-adapting member is used to automatically adjust the position of the insert in the direction of the opening and closing of the mold in the process that the locking block enters the locking groove.

[0010] By adopting the above technical scheme, the positioning blocks in the positioning member and the positioning grooves of the insert are in interference fit, and the core-pulling rod and the convex ring of the insert are in interference fit, so that the insert can be preliminarily positioned before injection molding, and the movement of the insert in the horizontal direction is limited; the locking block extends into the locking groove of the convex ring, so that the locking of the insert in the direction of the opening and closing of the mold is realized; by changing the position of the locking block, the position of the insert in the direction of the opening and closing of the mold is changed, the positioning of different positions of the insert is realized, and the curved pipe with different states of the insert can be conveniently molded.

[0011] Preferably, the movable rod is arranged to pass through the through slot arranged on the fixed mold plate and the fixed mold base plate, the top end of the movable rod extends out of the fixed mold plate, the side wall of the movable rod is provided with a limiting block, and the limiting block is movable only in the through slot of the fixed mold base plate; when the limiting block abuts against the fixed mold plate, the top surface of the insert abuts against the inner top wall of the forming cavity of the mold cavity plate; and when the limiting block abuts against the core-pulling rod, a gap is left between the top surface of the insert and the inner top wall of the forming cavity of the mold cavity plate for the molten plastic to pass through.

[0012] By adopting the above technical scheme, the movement range of the movable rod is limited by the limiting block, and the two limit positions of the movement of the movable rod are exactly the two state positions required after the positioning of the insert, so that the reliable adjustment and positioning of the position of the insert are realized.

[0013] Preferably, the driving member one comprises an electric cylinder, a first spring and a first pressing block, the first spring is located in a first sliding groove, two ends of the first spring abut on the bottom end of the first sliding groove and the bottom end of the moving rod respectively, and the first spring always drives the moving rod to move upward; the electric cylinder is fixedly arranged on the fixed plate of the fixed mold, a piston rod of the electric cylinder extends to the side of the moving rod in a direction perpendicular to the mold opening and closing, the first pressing block is fixed on the piston rod of the electric cylinder, a first chamfer is formed on the top end of the moving rod in a circumferential direction, and a first inclined surface matched with the first chamfer is formed on the side surface of the side of the first pressing block facing the moving rod; when the first pressing block is away from the moving rod, the limiting block abuts on the fixed plate of the fixed mold, and when the first pressing block completely abuts on the top surface of the moving rod, the limiting block abuts on the core pulling rod.

[0014] By adopting the technical scheme, the first spring always drives the moving rod to move upward, so that the limiting block abuts on the fixed plate of the fixed mold in the initial state, and the insert is ensured to be in the first position state; when the electric cylinder drives the first pressing block to move, the first inclined surface of the first pressing block is matched with the first chamfer of the moving rod to push the moving rod to move downward against the elastic force of the first spring, until the first pressing block completely abuts on the top surface of the moving rod and the limiting block abuts on the core pulling rod, the adjustment of the position of the insert is completed, and the insert is in the second position state; the position conversion of the insert in different states can be stably realized, and the reliability of the injection mold is ensured.

[0015] Preferably, the driving member two comprises a driving rod, a second spring and a second pressing block, a second sliding groove is formed in the moving rod in the mold opening and closing direction, the driving rod slides in the second sliding groove, the top end of the driving rod always extends above the moving rod, two ends of the second spring abut on the bottom wall of the second sliding groove and the bottom wall of the driving rod respectively, and the second spring is used for driving the driving rod to move upward; the bottom end of the driving rod and the end of the locking block away from the locking groove are connected to each other in an inclined direction through the cooperation of the wedge-shaped block and the wedge-shaped groove, a third sliding groove is formed in the moving rod for the sliding of the locking block; the second pressing block is fixedly arranged on the first pressing block through a screw, the second pressing block is located directly above the driving rod, an isosceles trapezoidal groove is formed on the bottom surface of the second pressing block, the top end of the driving rod is located in the isosceles trapezoidal groove, and a second chamfer is formed on the top end of the driving rod in a circumferential direction and matched with the inclined groove wall of the isosceles trapezoidal groove.

[0016] By adopting the technical scheme, the second spring drives the driving rod to move upwards, and the locking block is located in the core pulling rod in the initial state; when the first pressing block drives the second pressing block to move, the isosceles trapezoidal groove of the second pressing block is matched with the second chamfer of the driving rod, the driving rod is pushed to move downwards to overcome the elastic force of the second spring, the locking block is driven to move along the direction perpendicular to the mold opening and closing direction and extend into the locking groove of the convex ring, and the locking of the insert is realized. The isosceles trapezoidal groove of the second pressing block can press the driving rod in the process that the first pressing block presses or moves away from the moving rod, and the second pressing block can also prevent the driving rod from being separated from the moving rod, so that the switching of the two states is realized by using the same mechanism.

[0017] Preferably, the self-adapting part comprises a tapered chamfer opened at one end of the locking block towards the locking groove and a gradually expanding chamfer opened at the slot opening of the locking groove.

[0018] By adopting the technical scheme, the position of the insert in the mold opening and closing direction can be automatically fine-tuned in the process that the locking block enters the locking groove; when there is a certain position deviation between the locking block and the locking groove, the chamfer design can make the locking block push the insert to adaptively adjust during the insertion process, so that the locking block can smoothly enter the locking groove and reliable locking is realized. The insert only needs to be roughly installed on the positioning block and the core pulling rod, the requirement for the installation position precision of the insert is reduced, and the fault tolerance and installation efficiency of the mold positioning of the insert are improved.

[0019] Preferably, the number and distribution direction of the locking blocks are the same as those of the positioning blocks.

[0020] By adopting the technical scheme, the main purpose is to facilitate the installation of the insert. As long as the insert can be installed on the positioning block and the core pulling rod, the plurality of locking blocks must be aligned with the plurality of locking grooves.

[0021] Preferably, when the positioning block enters the positioning groove, the convex ring always blocks the movable groove.

[0022] By adopting the technical scheme, no matter what state the installation of the insert is in, the molten plastic can be effectively prevented from entering the inside of the core pulling rod from the movable groove during the injection molding process, the sliding groove of the driving part one, the driving part two and the locking block and other components can work normally, the normal mold opening and closing and the positioning and locking functions of the insert are prevented from being affected by the plastic, the service life of the mold is prolonged, and the continuity and stability of the injection molding production are ensured.

[0023] Preferably, an I-shaped groove is opened on the fixed plate of the stationary mold along the sliding direction of the first pressing block, one end of the I-shaped groove is communicated with the through slot of the fixed plate of the stationary mold, a I-shaped block is fixed at the bottom of the first pressing block, the I-shaped block slides in the I-shaped groove, and the through slot of the fixed plate of the stationary mold can be used for the I-shaped block to enter and be installed in the I-shaped groove.

[0024] By adopting the technical scheme, the cooperation of the I-shaped groove on the fixed plate of the stationary mold and the I-shaped block at the bottom of the first pressing block provides a stable guide and limiting structure for the sliding of the first pressing block, and the main purpose is to prevent the first pressing block from moving away from the stationary mold fixed plate under the action of the moving rod and the first spring, so as to lose the effective pressing displacement of the moving rod and affect the position fixing of the insert. Meanwhile, the slot of the stationary mold fixed plate is provided for the I-shaped block to enter and install the I-shaped groove, which facilitates the installation and disassembly of the first pressing block, facilitates the maintenance and repair of the related parts of the mold, and improves the practicability and maintenance convenience of the mold.

[0025] The technical effects of the present application mainly embody in the following aspects:

[0026] 1. The interference fit between the positioning block in the positioning piece and the positioning groove of the insert, and the interference fit between the core pulling rod and the convex ring of the insert, can preliminarily position the insert before injection molding, and limit the movement of the insert in the horizontal direction; the locking block extends into the locking groove of the convex ring, which can realize the locking of the insert in the opening and closing mold direction, and by changing the position of the locking block, the position of the insert in the opening and closing mold direction can be changed, so that the positioning of the insert at different positions is realized, thereby the bending pipe with different states of the insert can be conveniently formed;

[0027] 2. The second spring drives the driving rod to move upwards, so that the locking block is located in the core pulling rod in the initial state; when the first pressing block drives the second pressing block to move, the second pressing block isosceles trapezoidal groove cooperates with the second chamfer of the driving rod, the driving rod is pushed to move downwards against the elastic force of the second spring, the locking block is driven to move along the direction perpendicular to the opening and closing mold direction and extend into the locking groove of the convex ring, and the locking of the insert is realized; wherein, the isosceles trapezoidal groove of the second pressing block can press the driving rod in the process that the first pressing block presses or moves away from the moving rod, and at the same time, the second pressing block can prevent the driving rod from being separated from the moving rod, so that the switching of the two states is realized by the same mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structure schematic view of the bending pipe of the embodiment of the present application.

[0029] Figure 2 is a schematic view of two states of the insert in the bending pipe of the embodiment of the present application.

[0030] Figure 3 is a structure schematic view of the bending pipe of the embodiment of the present application.

[0031] Figure 4 is a schematic view of the bending pipe after the mold is opened.

[0032] Figure 5 is Figure 3 the sectional view of C-C line in FIG.

[0033] Figure 6 is Figure 5 is an enlarged view of D in

[0034] Figure 7 is Figure 5 is an enlarged view of E in

[0035] Figure 8 is Figure 5 is an enlarged view of F in

[0036] BRIEF DESCRIPTION OF DRAWINGS 1, fixed mold; 11, fixed mold fixed plate; 111, I-shaped groove; 12, fixed mold seat plate; 13, mold cavity plate; 131, forming cavity; 14, through slot; 2, movable mold; 3, insert; 31, positioning groove; 32, protruding ring; 33, locking groove; 4, positioning piece; 41, core pulling rod; 411, first sliding groove; 412, movable groove; 42, moving rod; 421, first chamfer; 422, limiting block; 423, second sliding groove; 424, third sliding groove; 43, locking block; 431, wedge-shaped block; 44, positioning block; 51, electric cylinder; 52, first spring; 53, first pressing block; 531, first inclined surface; 532, I-shaped block; 61, driving rod; 611, second chamfer; 612, wedge-shaped groove; 62, second spring; 63, second pressing block; 631, isosceles trapezoidal groove; 7, self-adapting piece; 71, tapered chamfer; 72, gradually expanding chamfer; 8, elbow. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings Figures 1-8 The application is further described in detail to make the technical scheme of the application easier to understand and master.

[0038] The embodiment of the application discloses a U-shaped elbow injection mold with an insert.

[0039] Referring to Figures 1-6 , the U-shaped elbow injection mold with an insert of the embodiment comprises a fixed mold 1, a movable mold 2, an insert 3 and a positioning piece 4 arranged on the fixed mold 1 for limiting the position of the insert 3, the fixed mold 1 comprises a fixed mold fixed plate 11, a fixed mold seat plate 12 and a mold cavity plate 13 arranged in sequence and fixed to each other, the positioning piece 4 comprises a core pulling rod 41, a driving piece one, a driving piece two, a self-adapting piece 7, a moving rod 42, at least one locking block 43 and at least two positioning blocks 44.

[0040] Referring to Figures 5-7The core pulling rod 41 is fixedly arranged in the mold cavity plate 13, the positioning blocks 44 are fixedly arranged on the top wall of the forming cavity 131 of the mold cavity plate 13 in the direction parallel to the opening and closing of the mold, the two positioning blocks 44 are symmetrically arranged on the two sides of the core pulling rod 41 respectively, two positioning grooves 31 are arranged on the top surface of the insert 3, and the two positioning blocks 44 are in interference fit with the two positioning grooves 31 respectively; a gap is left between the inner wall of the insert 3 and the core pulling rod 41, and the circumferential inner wall of the insert 3 is coaxially integrally formed with a protruding ring 32, the protruding ring 32 is sleeved on the core pulling rod 41 and is in interference fit with the core pulling rod 41.

[0041] With reference to Figures 5-7 The first sliding groove 411 is arranged in the core pulling rod 41, the driving moving rod 42 is driven to slide in the first sliding groove 411 in the direction of opening and closing of the mold, the locking block 43 slides on the moving rod 42 in the direction perpendicular to the opening and closing of the mold, the second driving element drives the locking block 43 to move, the movable groove 412 for the locking block 43 to move is arranged in the side wall of the first sliding groove 411 and faces the side of the protruding block, the locking groove 33 matched with the locking block 43 is arranged on the inner wall of the protruding ring 32, and the self-adapting element 7 is used for automatically adjusting the position of the insert 3 in the direction of opening and closing of the mold in the process that the locking block 43 enters the locking groove 33.

[0042] With reference to Figures 5-7 The interference fit between the positioning blocks 44 in the positioning element 4 and the positioning grooves 31 of the insert 3 and the interference fit between the core pulling rod 41 and the protruding ring 32 of the insert 3 can preliminarily position the insert 3 before injection molding and limit the movement of the insert 3 in the horizontal direction, the locking block 43 extends into the locking groove 33 of the protruding ring 32 and can lock the insert 3 in the direction of opening and closing of the mold, the position of the insert 3 in the direction of opening and closing of the mold is changed by changing the position of the locking block 43, the positioning of the insert 3 at different positions is realized, and thus the bent pipe 8 with different states of the insert 3 can be conveniently molded.

[0043] With reference to Figures 5-7 The through grooves 14 for the moving rod 42 to pass through are arranged on the fixed die plate 11 and the fixed die seat plate 12, the top end of the moving rod 42 extends out of the fixed die plate 11, the limiting block 422 is arranged on the side wall of the moving rod 42, and the limiting block 422 only moves in the through groove 14 of the fixed die seat plate 12; when the limiting block 422 abuts against the fixed die plate 11, the top surface of the insert 3 abuts against the top wall of the forming cavity 131 of the mold cavity plate 13, and when the limiting block 422 abuts against the core pulling rod 41, a gap is left between the top surface of the insert 3 and the top wall of the forming cavity 131 of the mold cavity plate 13 for the molten plastic to pass through.

[0044] With reference to Figure 5 The limiting block 422 limits the movement range of the moving rod 42, and the two limit positions of the movement of the moving rod 42 are exactly the two state positions required after the positioning of the insert 3, and reliable adjustment and positioning of the position of the insert 3 are realized.

[0045] With reference to Figures 5-8 , the driving member one includes the electric cylinder 51, the first spring 52 and the first pressing block 53, the first spring 52 is located in the first sliding groove 411, the two ends of the first spring 52 abut on the bottom end of the first sliding groove 411 and the bottom end of the moving rod 42 respectively, the first spring 52 always drives the moving rod 42 to move upwards; the electric cylinder 51 is fixedly arranged on the fixed mold plate 11, the piston rod of the electric cylinder 51 extends to the side of the moving rod 42 along the direction perpendicular to the opening and closing of the mold, the first pressing block 53 is fixed on the piston rod of the electric cylinder 51, the top end of the moving rod 42 is provided with the first chamfer 421 in the circumferential direction, the side surface of the side of the first pressing block 53 facing the moving rod 42 is provided with the first inclined surface 531 matched with the first chamfer 421; when the first pressing block 53 is away from the moving rod 42, the limiting block 422 abuts on the fixed mold plate 11, when the first pressing block 53 completely abuts on the top surface of the moving rod 42, the limiting block 422 abuts on the core pulling rod 41.

[0046] With reference to Figures 5-8 , the first spring 52 always drives the moving rod 42 to move upwards, so that the limiting block 422 abuts on the fixed mold plate 11 in the initial state, ensuring that the insert 3 is in the first position state; when the electric cylinder 51 drives the first pressing block 53 to move, the first inclined surface 531 of the first pressing block 53 is matched with the first chamfer 421 of the moving rod 42, the moving rod 42 is pushed to move downwards against the elastic force of the first spring 52, until the first pressing block 53 completely abuts on the top surface of the moving rod 42, the limiting block 422 abuts on the core pulling rod 41, the adjustment of the position of the insert 3 is completed, and the insert 3 is in the second position state; the position conversion of the insert 3 in different states can be stably realized, and the reliability of the injection mold work can be ensured.

[0047] With reference to Figures 5-8 , the driving member two includes the driving rod 61, the second spring 62 and the second pressing block 63, the second sliding groove 423 is arranged in the moving rod 42 along the opening and closing direction of the mold, the driving rod 61 slides in the second sliding groove 423, the top end of the driving rod 61 always extends above the moving rod 42, the two ends of the second spring 62 abut on the bottom wall of the second sliding groove 423 and the bottom wall of the driving rod 61 respectively, for driving the driving rod 61 to move upwards; the bottom end of the driving rod 61 and the end of the locking block 43 away from the locking groove 33 are connected to each other in the inclined direction through the cooperation of the wedge-shaped block 431 and the wedge-shaped groove 612, the third sliding groove 424 for the sliding of the locking block 43 is arranged on the moving rod 42; the second pressing block 63 is fixedly arranged on the first pressing block 53 through the screw, the second pressing block 63 is located directly above the driving rod 61, the isosceles trapezoidal groove 631 is arranged on the bottom surface of the second pressing block 63, the top end of the driving rod 61 is located in the isosceles trapezoidal groove 631, and the second chamfer 611 matched with the inclined groove wall of the isosceles trapezoidal groove 631 is arranged on the top end of the driving rod 61 in the circumferential direction.

[0048] With reference to Figures 5-8, the second spring 62 drives the driving rod 61 to move upward, so that the locking block 43 is initially located in the core pulling rod 41, when the first pressing block 53 drives the second pressing block 63 to move, the isosceles trapezoidal groove 631 of the second pressing block 63 cooperates with the second chamfer 611 of the driving rod 61, so that the driving rod 61 is pushed to move downward against the elastic force of the second spring 62, drives the locking block 43 to move along the direction perpendicular to the mold opening and closing direction and extends into the locking groove 33 of the convex ring 32, and the locking of the insert 3 is realized. Wherein, the isosceles trapezoidal groove 631 of the second pressing block 63 can press the driving rod 61 downward when the first pressing block 53 presses or moves away from the moving rod 42, and at the same time, the second pressing block 63 can prevent the driving rod 61 from being separated from the moving rod 42, so that the switching of the two states is realized by using the same mechanism.

[0049] With reference to Figures 4-8 In the mold opening process, the position of the moving rod 42 remains unchanged, the driving rod 61 moves upward, so that the locking block 43 is separated from the locking groove 33, at this time, the electric cylinder 51 can accurately control the moving distance of the first pressing block 53 and the second pressing block 63, so as to ensure that the state between the first pressing block 53 and the moving rod 42 remains unchanged, and the state between the second pressing block 63 and the driving rod 61 changes, and the second spring 62 can drive the driving rod 61 to reset. Then the movable mold 2 moves, so that the positioning block 44 is separated from the positioning groove 31, and the core pulling rod 41 is separated from the elbow pipe 8 and the insert 3, at this time, the inlet of the elbow pipe 8 realizes complete demolding.

[0050] With reference to Figures 5-8 The elastic force of the second spring 62 is smaller than that of the first spring 52, when the first pressing block 53 moves away from the moving rod 42 and the second pressing block 63 presses the driving rod 61 downward, under the action of the first spring 52, the position of the moving rod 42 will not change.

[0051] With reference to Figures 5-7 The adaptive part 7 comprises a tapered chamfer 71 formed at one end of the locking block 43 towards the locking groove 33 and a tapered chamfer 72 formed at the opening of the locking groove 33.

[0052] With reference to Figures 5-7 In the process that the locking block 43 enters the locking groove 33, the position of the insert 3 in the mold opening and closing direction can be automatically adjusted; when there is a certain position deviation between the locking block 43 and the locking groove 33, the chamfer design can make the locking block 43 push the insert 3 to adaptively adjust during the insertion process, so as to ensure that the locking block 43 smoothly enters the locking groove 33 and realizes reliable locking, and the operator only needs to roughly install the insert 3 on the positioning block 44 and the core pulling rod 41, which reduces the requirement for the installation position accuracy of the insert 3 and improves the fault tolerance and installation efficiency of the mold positioning of the insert 3.

[0053] With reference to Figures 5-7The number and distribution of the locking blocks 43 are the same as those of the positioning blocks 44. The main purpose is to facilitate the installation of the insert 3. As long as the insert 3 can be installed on the positioning blocks 44 and the core-pulling rod 41, the plurality of locking blocks 43 must be aligned with the plurality of locking grooves 33.

[0054] With reference to Figures 5-7 When the positioning blocks 44 enter the positioning grooves 31, the convex ring 32 always blocks the movable groove 412. Regardless of the installation state of the insert 3, the molten plastic can be effectively prevented from entering the inside of the core-pulling rod 41 from the movable groove 412 during the injection molding process, the plastic is prevented from blocking the sliding groove of the core-pulling rod 41, the normal sliding work of the driving member one, the driving member two and the locking block 43 and other components is ensured, the normal mold opening and closing and the positioning and locking functions of the insert 3 are prevented from being affected by the plastic, the service life of the mold is prolonged, and the continuity and stability of the injection molding production are ensured.

[0055] With reference to Figure 5 And Figure 8 The I-shaped groove 111 is formed on the fixed plate 11 along the sliding direction of the first pressing block 53, one end of the I-shaped groove 111 is communicated with the through groove 14 of the fixed plate 11, the I-shaped block 532 is fixed at the bottom of the first pressing block 53, the I-shaped block 532 slides in the I-shaped groove 111, and the through groove 14 of the fixed plate 11 can be used for the installation of the I-shaped block 532 into the I-shaped groove 111.

[0056] With reference to Figure 5 And Figure 8 The cooperation between the I-shaped groove 111 on the fixed plate 11 and the I-shaped block 532 at the bottom of the first pressing block 53 provides a stable guide and limiting structure for the sliding of the first pressing block 53. The main purpose is to prevent the first pressing block 53 from moving away from the fixed plate 11 under the action of the moving rod 42 and the first spring 52, thereby losing the effective pressing displacement of the moving rod 42 and affecting the position fixing of the insert 3. At the same time, the through groove 14 of the fixed plate 11 is used for the installation of the I-shaped block 532 into the I-shaped groove 111, which facilitates the installation and disassembly of the first pressing block 53 and facilitates the maintenance and repair of the related components of the mold, thereby improving the practicability and maintenance convenience of the mold.

[0057] Of course, the above is only a typical example of the present application, in addition to which the present application can have other various specific embodiments, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of the present application.

Claims

1. A U-bend tube injection mold with insert, characterized by: The injection mold comprises a fixed mold (1), a movable mold (2), an insert (3), and a positioning member (4) arranged on the fixed mold (1) to limit the position of the insert (3), wherein the fixed mold (1) comprises a fixed mold fixing plate (11), a fixed mold base plate (12), and a mold cavity plate (13) arranged in sequence and fixed to each other, and the positioning member (4) comprises a core-pulling rod (41), a driving member one, a driving member two, a self-adapting member (7), a moving rod (42), at least one locking block (43), and at least two positioning blocks (44). The core-pulling rod (41) is fixedly arranged in the mold cavity plate (13), the positioning blocks (44) are fixedly arranged on the top wall of a forming cavity (131) of the mold cavity plate (13) in a direction parallel to mold opening and closing, two positioning blocks (44) are symmetrically arranged on the two sides of the core-pulling rod (41) respectively, two positioning grooves (31) are arranged on the top surface of the insert (3), and the two positioning blocks (44) are in interference fit with the two positioning grooves (31) respectively; a gap is left between the inner wall of the insert (3) and the core-pulling rod (41), and a convex ring (32) is coaxially and integrally formed on the circumferential inner wall of the insert (3), the convex ring (32) is sleeved on the core-pulling rod (41) and is in interference fit with the core-pulling rod (41). A first sliding groove (411) is arranged in the core-pulling rod (41), the driving member one drives the moving rod (42) to slide in the first sliding groove (411) in the direction of mold opening and closing, the locking block (43) slides on the moving rod (42) in a direction perpendicular to the direction of mold opening and closing, the driving member two drives the locking block (43) to move, the movable groove (412) for the movement of the locking block (43) is arranged on the side wall of the first sliding groove (411) and faces the side of the protruding block, the locking groove (33) matched with the locking block (43) is arranged on the inner wall of the convex ring (32), and the self-adapting member (7) is used to automatically adjust the position of the insert (3) in the direction of mold opening and closing during the process that the locking block (43) enters the locking groove (33). The moving rod (42) is arranged to pass through the through slot (14) arranged on the fixed mold fixing plate (11) and the fixed mold base plate (12), the top end of the moving rod (42) extends out of the fixed mold fixing plate (11), the limiting block (422) is arranged on the side wall of the moving rod (42), and the limiting block (422) only moves in the through slot (14) of the fixed mold base plate (12); when the limiting block (422) abuts against the fixed mold fixing plate (11), the top surface of the insert (3) abuts against the top wall of the forming cavity (131) of the mold cavity plate (13), and when the limiting block (422) abuts against the core-pulling rod (41), a gap is left between the top surface of the insert (3) and the top wall of the forming cavity (131) of the mold cavity plate (13) for the passage of molten plastic.

2. The U-bend insert-molded tube injection mold according to claim 1, characterized in that: The driving member one includes an electric cylinder (51), a first spring (52) and a first pressing block (53), the first spring (52) is located in the first sliding groove (411), the two ends of the first spring (52) are respectively abutted on the bottom end of the first sliding groove (411) and the bottom end of the moving rod (42), and the first spring (52) always drives the moving rod (42) to move upwards; the electric cylinder (51) is fixedly arranged on the fixed mold fixed plate (11), the piston rod of the electric cylinder (51) extends to the side of the moving rod (42) in the direction perpendicular to the mold opening and closing, the first pressing block (53) is fixed on the piston rod of the electric cylinder (51), and the top end of the moving rod (42) is provided with a first chamfer (421) in the circumferential direction; when the first pressing block (53) is away from the moving rod (42), the limiting block (422) is abutted on the fixed mold fixed plate (11), and when the first pressing block (53) is completely abutted on the top surface of the moving rod (42), the limiting block (422) is abutted on the core pulling rod (41).

3. The U-bend insert-molded tube injection mold of claim 2, wherein: The driving member two includes a driving rod (61), a second spring (62) and a second pressing block (63), the moving rod (42) is provided with a second sliding groove (423) in the direction of the mold opening and closing, the driving rod (61) slides in the second sliding groove (423), the top end of the driving rod (61) always extends above the moving rod (42), and the two ends of the second spring (62) are respectively abutted on the bottom wall of the second sliding groove (423) and the bottom wall of the driving rod (61) and used for driving the driving rod (61) to move upwards; the bottom end of the driving rod (61) and one end of the locking block (43) away from the locking groove (33) are connected in the inclined direction through the cooperation of the wedge-shaped block (431) and the wedge-shaped groove (612), and the moving rod (42) is provided with a third sliding groove (424) for sliding of the locking block (43); the second pressing block (63) is fixedly arranged on the first pressing block (53) through a screw, the second pressing block (63) is located directly above the driving rod (61), the bottom surface of the second pressing block (63) is provided with an isosceles trapezoidal groove (631), the top end of the driving rod (61) is located in the isosceles trapezoidal groove (631), and the top end of the driving rod (61) is provided with a second chamfer (611) in the circumferential direction and matched with the inclined groove wall of the isosceles trapezoidal groove (631).

4. The U-bend tube injection mold with insert of claim 1, wherein: The self-adapting member (7) includes a tapered chamfer (71) provided on one end of the locking block (43) towards the locking groove (33) and a tapered chamfer (72) provided on the slot opening of the locking groove (33).

5. The U-bend insert-molded tube injection mold of claim 1, wherein: The number and distribution direction of the locking block (43) and the positioning block (44) are the same.

6. The U-bend insert-molded tube injection mold of claim 1, wherein: When the positioning block (44) enters the positioning groove (31), the convex ring (32) always blocks the movable groove (412).

7. The U-bend tube insert-molding die according to claim 2, wherein: The fixed plate (11) is provided with an I-shaped slot (111) along the sliding direction of the first pressing block (53), one end of the I-shaped slot (111) is communicated with the through slot (14) of the fixed plate (11), the bottom of the first pressing block (53) is fixed with an I-shaped block (532), the I-shaped block (532) slides in the I-shaped slot (111), and the through slot (14) of the fixed plate (11) can be used for the I-shaped block (532) to enter and be installed with the I-shaped slot (111).

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