U-shaped elbow injection mold with insert

Abstract

The U-shaped bent pipe injection mold comprises a fixed mold body, a movable mold body, the insert and positioning pieces, the fixed mold body comprises a fixed mold fixing plate, a fixed mold base plate and a mold cavity plate which are fixedly arranged in sequence, and the positioning pieces comprise a core pulling rod, a first driving piece, a second driving piece, a movable 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 inner top wall of a forming cavity of the mold cavity plate, two positioning grooves are formed in the top surface of the insert, and the two positioning blocks are respectively in interference fit with the two positioning grooves; a convex ring in interference fit with the core-pulling rod is arranged on the circumferential inner wall of the insert; the first driving piece drives the moving rod to slide in the core pulling rod, the second driving piece drives the locking block to slide on the moving rod, and a locking groove matched with the locking block is formed in the inner wall of the convex ring. The position of the insert in the mold opening and closing direction is changed by changing the position of the locking block, positioning of different positions of the insert is achieved, and therefore bent pipes with different insert states can be conveniently formed.

Description

Technical Field

[0001] The present invention relates to the field of molds, and particularly to an injection mold for a U-shaped bent pipe with inserts. Background Art

[0002] Insert injection molding is an integrated molding process in which inserts (usually metals, fibers or other prefabricated parts) are pre-placed in an injection mold, and then, after molten plastic is injected and cooled and solidified, the inserts are firmly bonded to the plastic.

[0003] For a bent pipe as Figure 1 shown, the insert 3 needs to be integrally formed at the inlet of the bent pipe 8. As Figure 2 shown, there are two states for the formation of the insert 3: after the insert 3 shown in Figure A is integrally formed with the bent pipe 8, it directly serves as the inner wall of the inlet of the bent pipe 8, serving both functional and structural support functions; the insert 3 shown in Figure B is similar to a sheath structure, mainly used to enhance the structural strength of the inlet of the bent pipe 8, and the inlet of the bent pipe 8 itself can be reliably docked with other pipes through a hot melt process.

[0004] When forming two bent pipes with different insert states as above, different positioning members are usually required to fix the position of the insert. In actual production, if two molds equipped with different positioning members are used for separate production, the mold development cost will be significantly increased; if the same set of molds is used and the production of different bent pipes is achieved by disassembling the mold to replace the positioning members, it will result in a long disassembly and assembly time and low production efficiency. Summary of the Invention

[0005] In order to facilitate the formation of bent pipes with different insert states, the present application provides an injection mold for a U-shaped bent pipe with inserts.

[0006] The injection mold for a U-shaped bent pipe with inserts provided by the present application adopts the following technical solutions: An injection mold for a U-shaped bent pipe with inserts, comprising a fixed mold, a movable mold, an insert, and a positioning member arranged on the fixed mold for restricting the position of the insert. The fixed mold comprises a fixed mold fixing plate, a fixed mold base plate, and a mold cavity plate which are fixedly arranged with each other in sequence. The positioning member comprises a core pulling rod, a driving member I, a driving member II, an adaptive member, 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 fixedly arranged on the top wall of the forming cavity of the mold cavity plate along the direction parallel to the mold opening and closing. The two positioning blocks are symmetrically arranged on both sides of the core pulling rod respectively. Two positioning grooves are formed 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. A convex ring is integrally formed coaxially on the circumferential inner wall of the insert, and the convex ring is sleeved on the core pulling rod and is in interference fit with the core pulling rod; A first chute is formed in the core-pulling rod. The first driving member drives the moving rod to slide in the first chute along the mold-closing and mold-opening direction. The locking block slides on the moving rod along a direction perpendicular to the mold-closing and mold-opening direction. The second driving member drives the locking block to move. An activity slot for the locking block to move is formed through the side wall of the first chute towards the bump side. A locking slot matching with the locking block is formed on the inner wall of the convex ring. The adaptive member is used to automatically adjust the position of the insert in the mold-closing and mold-opening direction during the process of the locking block entering the locking slot.

[0007] By adopting the above technical solution, the interference fit between the positioning block in the positioning member and the positioning slot of the insert, as well as 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 its movement in the horizontal direction. The locking block extends into the locking slot of the convex ring, which can lock the insert in the mold-closing and mold-opening direction. By changing the position of the locking block, the position of the insert in the mold-closing and mold-opening direction can be changed, so as to realize the positioning of different positions of the insert, and thus it is convenient to mold the bent pipe with different insert states.

[0008] Preferably, through slots for the moving rod to pass through are formed on both the fixed mold fixing plate and the fixed mold base plate. The top end of the moving rod extends out of the fixed mold fixing plate. A limiting block is arranged on the side wall of the moving rod, and the limiting block only moves in the through slot of the fixed mold base plate. When the limiting block abuts against the fixed mold fixing plate, the top surface of the insert body tightly abuts against the top wall of the forming cavity of the mold cavity plate. When the limiting block abuts against the core-pulling rod, a gap for molten plastic to pass through is left between the top surface of the insert body and the top wall of the forming cavity of the mold cavity plate.

[0009] By adopting the above technical solution, the limiting block limits the moving range of the moving rod. The two extreme positions of the moving rod are exactly the two state positions required after the insert is positioned, realizing reliable adjustment and positioning of the insert position.

[0010] Preferably, the first driving member includes an electric cylinder, a first spring and a first pressing block. The first spring is located in the first chute. The two ends of the first spring respectively abut against the bottom end of the first chute and the bottom end of the moving rod. The first spring always drives the moving rod to move upward. The electric cylinder is fixedly arranged on the fixed mold fixing plate. The piston rod of the electric cylinder extends towards the moving rod along a direction perpendicular to the mold-closing and mold-opening direction. 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 along the circumferential direction. A first inclined surface matching with the first chamfer is formed on the side surface of the first pressing block facing the moving rod. When the first pressing block moves away from the moving rod, the limiting block abuts against the fixed mold fixing plate. When the first pressing block completely abuts against the top surface of the moving rod, the limiting block abuts against the core-pulling rod.

[0011] By adopting the above technical solution, the first spring always drives the moving rod to move upward, so that the limiting block abuts against the fixed mold fixing plate in the initial state, ensuring that the insert is in the first position state; when the electric cylinder drives the first pressing block to move, by using the cooperation between the first inclined surface of the first pressing block and the first chamfer of the moving rod, the moving rod is pushed to move downward against the elastic force of the first spring until the first pressing block completely abuts against the top surface of the moving rod, and the limiting block abuts against the core pulling rod, completing the adjustment of the position of the insert, and the insert is in the second position state; the position conversion of the insert in different states can be stably realized, ensuring the reliability of the injection mold during operation.

[0012] Preferably, the second driving member includes a driving rod, a second spring and a second pressing block. A second sliding groove is formed in the moving rod along the mold opening and closing direction. The driving rod slides in the second sliding groove, and the top end of the driving rod always extends above the moving rod. Two ends of the second spring respectively abut against the bottom wall of the second sliding groove and the bottom wall of the driving rod, and are 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 slidably connected to each other along an inclined direction through the cooperation of a wedge block and a wedge groove. A third sliding groove for the locking block to slide is formed in the moving rod; the second pressing block is fixedly arranged on the first pressing block through screws. The second pressing block is located directly above the driving rod. An isosceles trapezoidal groove is formed in 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 in the circumferential direction of the top end of the driving rod to cooperate with the inclined groove wall of the isosceles trapezoidal groove.

[0013] By adopting the above technical solution, the second spring drives the driving rod to move upward, so that the locking block is initially located in the core pulling rod. When the first pressing block drives the second pressing block to move, by using the cooperation between the isosceles trapezoidal groove of the second pressing block and the second chamfer of the driving rod, the driving rod is pushed to move downward against the elastic force of the second spring, driving the locking block to move in a direction perpendicular to the mold opening and closing direction and extending into the locking groove of the convex ring, realizing the locking of the insert. Among them, the isosceles trapezoidal groove of the second pressing block can play a role in pressing down the driving rod both when the first pressing block presses on or moves away from the moving rod, and at the same time, the second pressing block can also prevent the driving rod from detaching from the moving rod, realizing the switching of two states by using the same mechanism.

[0014] Preferably, the self-adaptive member includes a gradually shrinking chamfer formed at one end of the locking block facing the locking groove and a gradually expanding chamfer formed at the notch of the locking groove.

[0015] By adopting the above technical solution, during the process of the locking block entering the locking groove, the position of the insert in the mold opening and closing direction can be automatically fine-tuned; when there is a certain positional deviation between the locking block and the locking groove, this chamfer design enables the locking block to push the insert for adaptive adjustment during the insertion process, ensuring that the locking block smoothly enters the locking groove and achieving reliable locking. The operator only needs to roughly install the insert on the positioning block and the core-pulling rod, which reduces the requirement for the installation position accuracy of the insert, improves the fault tolerance of the mold for insert positioning, and increases the installation efficiency.

[0016] Preferably, the number and distribution orientation of the locking blocks and the positioning blocks are the same.

[0017] By adopting the above technical solution, it is mainly to facilitate the installation of the insert. As long as the insert can be installed on the positioning block and the core-pulling rod, multiple locking blocks will surely align with multiple locking grooves.

[0018] Preferably, when the positioning block enters the positioning groove, the convex ring always blocks the movable groove.

[0019] By adopting the above technical solution, no matter what state the insert installation is in, it can effectively prevent the molten plastic from entering the inside of the core-pulling rod from the movable groove during the injection molding process, avoid the plastic from blocking the sliding groove of the core-pulling rod, ensure the normal sliding operation of components such as the first driving part, the second driving part, and the locking block, prevent the normal mold opening and closing and the positioning and locking functions of the insert from being affected due to the plastic entering, extend the service life of the mold, and ensure the continuity and stability of the injection molding production.

[0020] Preferably, an I-shaped groove is formed on the fixed mold fixing plate along the sliding direction of the first pressing block. One end of the I-shaped groove communicates with the through groove of the fixed mold fixing plate. An I-shaped block is fixed at the bottom of the first pressing block, and the I-shaped block slides in the I-shaped groove. The through groove of the fixed mold fixing plate can allow the I-shaped block to enter and be installed with the I-shaped groove.

[0021] By adopting the above technical solution, the cooperation between the I-shaped groove on the fixed mold fixing plate and the I-shaped block at the bottom of the first pressing block provides a stable guiding and limiting structure for the sliding of the first pressing block. The main purpose is to prevent the first pressing block from moving towards the side away from the fixed mold fixing plate under the action of the moving rod and the first spring, thus losing the effective pressing displacement for the moving rod and affecting the position fixing of the insert. At the same time, the through groove of the fixed mold fixing plate allows the I-shaped block to enter and be installed with the I-shaped groove, which facilitates the installation and disassembly of the first pressing block, is convenient for maintaining and overhauling the relevant components of the mold, and improves the practicality and maintenance convenience of the mold.

[0022] The technical effects of the present invention are mainly reflected in the following aspects: 1. In the positioning member of the present invention, the interference fit between the positioning block and the positioning groove of the insert, as well as the interference fit between the core-pulling rod and the convex ring of the insert, can preliminarily position the insert before injection molding and restrict its movement in the horizontal direction. The locking block extends into the locking groove of the convex ring, which can lock the insert in the mold opening and closing direction. By changing the position of the locking block, the position of the insert in the mold opening and closing direction can be changed, realizing the positioning of the insert at different positions, so that it is convenient to mold bent pipes with different insert states. 2. In the present invention, the second spring drives the driving rod to move upward, so that the locking block is initially located inside the core-pulling rod. When the first pressing block drives the second pressing block to move, using the cooperation between the isosceles trapezoidal groove of the second pressing block and the second chamfer of the driving rod, the driving rod is pushed to move downward against the elastic force of the second spring, driving the locking block to move in a direction perpendicular to the mold opening and closing direction and extending into the locking groove of the convex ring to lock the insert. Among them, the isosceles trapezoidal groove of the second pressing block can press down the driving rod during the process of the first pressing block pressing on or moving away from the moving rod, and at the same time, the second pressing block can also prevent the driving rod from detaching from the moving rod, realizing the switching of two states by the same mechanism. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the bent pipe in the embodiment of the present application.

[0024] Figure 2 It is a schematic diagram of two states formed by the insert in the bent pipe in the embodiment of the present application.

[0025] Figure 3 It is a schematic structural diagram of the mold for simultaneously injecting bent pipes with two insert states in the embodiment of the present application.

[0026] Figure 4 It is a schematic diagram of the bent pipe after mold opening in the embodiment of the present application.

[0027] Figure 5 It is Figure 3 The cross-sectional view taken along line C-C in

[0028] Figure 6 It is Figure 5 The enlarged view at D in

[0029] Figure 7 It is Figure 5 The enlarged view at E in

[0030] Figure 8 It is Figure 5 The enlarged view at F in

[0031] Explanation of reference numerals: 1, fixed die; ‌11, fixed die fixing plate; 111, I-shaped groove; 12, fixed die seat plate; 13, cavity plate; 131, molding cavity; 14, through groove; 2, movable die; 3, insert; 31, positioning groove; 32, convex ring; 33, locking groove; 4, positioning member; 41, core pulling rod; 411, first sliding groove; 412, movable groove; 42, moving rod; 421, first chamfer; 422, limit block; 423, second sliding Groove; 424, third slide groove; 43, locking block; 431, wedge block; 44, positioning block; 51, electric cylinder; 52, first spring; 53, first pressure block; 531, first inclined surface; 532, I-block; 61, drive rod; 611, second chamfer; 612, wedge groove; 62, second spring; 63, second pressure block; 631, isosceles trapezoidal groove; 7, adaptive part; 71, tapered chamfer; 72, gradually expanding chamfer; 8, elbow. DETAILED DESCRIPTION

[0032] The following is combined with Figures 1-8 The present application is further described in detail to make the technical solution of the present application easier to understand and grasp.

[0033] The embodiment of the present application discloses a U-shaped elbow injection mold with an insert.

[0034] Reference Figures 1-6 The U-shaped elbow injection mold with an insert in this embodiment includes a fixed mold 1, a movable mold 2, an insert 3 and a positioning member 4 arranged on the fixed mold 1 for limiting the position of the insert 3. The fixed mold 1 includes a fixed mold fixing plate 11, a fixed mold seat plate 12 and a cavity plate 13 fixed to each other in sequence. The positioning member 4 includes a core pull rod 41, a driving member 1, a driving member 2, an adaptive member 7, a moving rod 42, at least one locking block 43 and at least two positioning blocks 44. Reference Figures 5-7 The core pulling rod 41 is fixedly arranged in the cavity plate 13, and the positioning block 44 is fixedly arranged on the inner top wall of the molding cavity 131 of the cavity plate 13 in a direction parallel to the opening and closing of the mold. The two positioning blocks 44 are symmetrically arranged on both sides of the core pulling rod 41, and two positioning grooves 31 are provided on the top surface of the insert 3. The two positioning blocks 44 are respectively interference fit with the two positioning grooves 31; 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 integrally formed on the circumferential inner wall of the insert 3, and the convex ring 32 is sleeved on the core pulling rod 41 and interference fit with the core pulling rod 41.

[0035] Reference Figures 5-7, a first sliding groove 411 is formed in the core-pulling rod 41. The first driving member drives the moving rod 42 to slide in the first sliding groove 411 along the mold opening and closing direction. The locking block 43 slides on the moving rod 42 along a direction perpendicular to the mold opening and closing direction. The second driving member drives the locking block 43 to move. An activity groove 412 for the locking block 43 to move is formed through the side wall of the first sliding groove 411 toward the convex block side. A locking groove 33 cooperating with the locking block 43 is formed on the inner wall of the convex ring 32. The adaptive member 7 is used to automatically adjust the position of the insert 3 in the mold opening and closing direction during the process of the locking block 43 entering the locking groove 33.

[0036] Refer to Figures 5-7 , the interference fit between the positioning block 44 in the positioning member 4 and the positioning groove 31 of the insert 3, as well as the interference fit between the core-pulling rod 41 and the convex ring 32 of the insert 3, can both perform preliminary positioning on the insert 3 before injection molding and limit its movement in the horizontal direction. The locking block 43 extends into the locking groove 33 of the convex ring 32, which can lock the insert 3 in the mold opening and closing direction. By changing the position of the locking block 43, the position of the insert 3 in the mold opening and closing direction can be changed, realizing the positioning of different positions of the insert 3, so that it is convenient to mold the bent pipe 8 with different states of the insert 3.

[0037] Refer to Figures 5-7 , through grooves 14 for the moving rod 42 to pass through are formed on both 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. A 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 mold base plate 12. When the limiting block 422 abuts against the fixed mold fixing plate 11, the top surface of the insert body tightly abuts against the inner top wall of the forming cavity 131 of the cavity plate 13. When the limiting block 422 abuts against the core-pulling rod 41, a gap for molten plastic to pass through is left between the top surface of the insert body and the inner top wall of the forming cavity 131 of the cavity plate 13.

[0038] Refer to Figure 5 , the limiting block 422 limits the moving range of the moving rod 42. The two extreme positions where the moving rod 42 moves are exactly the two state positions required after the insert 3 is positioned, realizing reliable adjustment and positioning of the position of the insert 3.

[0039] Refer to Figures 5-8, the first driving member includes an electric cylinder 51, a first spring 52 and a first pressing block 53. The first spring 52 is located in the first chute 411. The two ends of the first spring 52 respectively abut against the bottom end of the first chute 411 and the bottom end of the moving rod 42. The first spring 52 always drives the moving rod 42 to move upward. The electric cylinder 51 is fixedly arranged on the fixed mold fixing plate 11. The piston rod of the electric cylinder 51 extends toward the side of the moving rod 42 in a direction perpendicular to the mold opening and closing. The first pressing block 53 is fixed on the piston rod of the electric cylinder 51. A first chamfer 421 is formed on the top end of the moving rod 42 in the circumferential direction. A first inclined surface 531 matching the first chamfer 421 is formed on the side surface of the first pressing block 53 facing the moving rod 42. When the first pressing block 53 moves away from the moving rod 42, the limiting block 422 abuts against the fixed mold fixing plate 11. When the first pressing block 53 completely abuts against the top surface of the moving rod 42, the limiting block 422 abuts against the core pulling rod 41.

[0040] Refer to Figures 5-8 , the first spring 52 always drives the moving rod 42 to move upward, so that the limiting block 422 abuts against the fixed mold fixing 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, by using the cooperation between the first inclined surface 531 of the first pressing block 53 and the first chamfer 421 of the moving rod 42, the moving rod 42 is pushed to move downward against the elastic force of the first spring 52 until the first pressing block 53 completely abuts against the top surface of the moving rod 42 and the limiting block 422 abuts against the core pulling rod 41, completing the adjustment of the position of the insert 3, and the insert 3 is in the second position state. It can stably realize the position conversion of the insert 3 in different states and ensure the reliability of the injection mold work.

[0041] Refer to Figures 5-8 , the second driving member includes a driving rod 61, a second spring 62 and a second pressing block 63. A second chute 423 is formed in the moving rod 42 in the mold opening and closing direction. The driving rod 61 slides in the second chute 423. The top end of the driving rod 61 always extends above the moving rod 42. The two ends of the second spring 62 respectively abut against the bottom wall of the second chute 423 and the bottom wall of the driving rod 61, and are used to drive the driving rod 61 to move upward. The bottom end of the driving rod 61 and the end of the locking block 43 away from the locking groove 33 are slidably connected to each other in an inclined direction through the cooperation of a wedge block 431 and a wedge groove 612. A third chute 424 for the locking block 43 to slide is formed in the moving rod 42. The second pressing block 63 is fixedly arranged on the first pressing block 53 by screws. The second pressing block 63 is located directly above the driving rod 61. An isosceles trapezoidal groove 631 is formed 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. A second chamfer 611 matching the inclined groove wall of the isosceles trapezoidal groove 631 is formed on the top end of the driving rod 61 in the circumferential direction.

[0042] Refer 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 inside the core-pulling rod 41. When the first pressing block 53 drives the second pressing block 63 to move, by using the cooperation between the isosceles trapezoidal groove 631 of the second pressing block 63 and the second chamfer 611 of the driving rod 61, the driving rod 61 is pushed to move downward against the elastic force of the second spring 62, driving the locking block 43 to move in a direction perpendicular to the mold opening and closing direction and extend into the locking groove 33 of the convex ring 32, realizing the locking of the insert 3. Among them, the isosceles trapezoidal groove 631 of the second pressing block 63 can exert a downward pressure on the driving rod 61 both when the first pressing block 53 presses or moves away from the moving rod 42. At the same time, the second pressing block 63 can also prevent the driving rod 61 from detaching from the moving rod 42, realizing the switching between two states driven by the same mechanism.

[0043] Refer to Figures 4-8 , during the mold opening process, the position of the moving rod 42 should remain unchanged, and the driving rod 61 should move upward to make the locking block 43 disengage from the locking groove 33. At this time, the electric cylinder 51 can accurately control the moving distances of the first pressing block 53 and the second pressing block 63, ensuring 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. The second spring 62 can drive the driving rod 61 to reset. Then the moving mold 2 moves, making the positioning block 44 disengage from the positioning groove 31, and the core-pulling rod 41 disengage from the elbow pipe 8 and the insert 3. At this time, the inlet of the elbow pipe 8 is completely demolded.

[0044] Refer to Figures 5-8 , the elastic force of the second spring 62 is less than the elastic force 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 down on the driving rod 61, under the action of the first spring 52, the position of the moving rod 42 will not change.

[0045] Refer to Figures 5-7 , the adaptive member 7 includes a tapered chamfer 71 opened at one end of the locking block 43 facing the locking groove 33 and a tapered chamfer 72 opened at the notch of the locking groove 33.

[0046] Refer to Figures 5-7 , during the process of the locking block 43 entering the locking groove 33, it can automatically fine-tune the position of the insert 3 in the mold opening and closing direction; when there is a certain position deviation between the locking block 43 and the locking groove 33, this chamfer design can make the locking block 43 push the insert 3 for adaptive adjustment during the insertion process, ensuring that the locking block 43 smoothly enters the locking groove 33 and realizing reliable locking. The operator only needs to roughly install the insert 3 on the positioning block 44 and the core-pulling rod 41, reducing the requirement for the installation position accuracy of the insert 3 and improving the positioning error tolerance and installation efficiency of the mold for the insert 3.

[0047] Refer to Figures 5-7The number and distribution of the locking blocks 43 and the positioning blocks 44 are the same. This is mainly to facilitate the installation of the insert 3. As long as the insert 3 can be installed on the positioning block 44 and the core pulling rod 41, the multiple locking blocks 43 must be aligned with the multiple locking grooves 33.

[0048] Reference Figures 5-7 When the positioning block 44 enters the positioning groove 31, the convex ring 32 always blocks the movable groove 412. No matter what state the insert 3 is installed in, it can effectively prevent the molten plastic from entering the core-pulling rod 41 from the movable groove 412 during the injection molding process, avoid the plastic from clogging the slide groove of the core-pulling rod 41, ensure the normal sliding of the driving member 1, the driving member 2 and the locking block 43, prevent the normal opening and closing of the mold and the positioning and locking functions of the insert 3 from being affected by the entry of plastic, extend the service life of the mold, and ensure the continuity and stability of the injection molding production.

[0049] Reference Figure 5 and Figure 8 An I-shaped groove 111 is opened on the fixed mold fixing plate 11 along the sliding direction of the first pressing block 53, one end of the I-shaped groove 111 is connected to the through groove 14 of the fixed mold fixing plate 11, an 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 mold fixing plate 11 can allow the I-shaped block 532 to enter and be installed with the I-shaped groove 111.

[0050] Reference Figure 5 and Figure 8 The cooperation between the I-shaped groove 111 on the fixed mold fixing plate 11 and the I-shaped block 532 at the bottom of the first pressing block 53 provides a stable guide and limit structure for the sliding of the first pressing block 53, and the main purpose is to prevent the first pressing block 53 from moving toward the side away from the fixed mold fixing 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 fixation of the insert 3. At the same time, the through groove 14 of the fixed mold fixing plate 11 allows the I-shaped block 532 to enter and install with the I-shaped groove 111, which facilitates the installation and removal of the first pressing block 53, facilitates the maintenance and overhaul of the mold-related components, and improves the practicality and maintenance convenience of the mold.

[0051] Of course, the above are only typical examples of the present application. In addition, the present application may have many other specific implementation methods. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present application.

Claims

1. An injection mold for a U-shaped elbow with inserts, characterized in that: It includes a fixed mold (1), a movable mold (2), an insert (3), and a positioning member (4) provided on the fixed mold (1) for restricting the position of the insert (3). The fixed mold (1) includes a fixed mold fixing plate (11), a fixed mold base plate (12), and a cavity plate (13) which are fixedly arranged with each other in sequence. The positioning member (4) includes a core-pulling rod (41), a first driving member, a second driving member, an adaptive 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 cavity plate (13). The positioning blocks (44) are fixedly arranged on the top wall of the forming cavity (131) of the cavity plate (13) along the direction parallel to the mold opening and closing. The two positioning blocks (44) are symmetrically arranged on both sides of the core-pulling rod (41). Two positioning grooves (31) are formed 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). A convex ring (32) is integrally formed coaxially on the circumferential inner wall of the insert (3), and 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 formed in the core-pulling rod (41). The first driving member drives the moving rod (42) to slide in the first sliding groove (411) along the mold opening and closing direction. The locking block (43) slides on the moving rod (42) along the direction perpendicular to the mold opening and closing. The second driving member drives the locking block (43) to move. An activity groove (412) for the locking block (43) to move is formed through the side wall of the first sliding groove (411) towards the convex block side. A locking groove (33) matched with the locking block (43) is formed on the inner wall of the convex ring (32). The adaptive member (7) is used to automatically adjust the position of the insert (3) in the mold opening and closing direction during the process of the locking block (43) entering the locking groove (33).

2. The injection mold for U-shaped bent pipe with inserts according to claim 1, characterized in that: Through grooves (14) for the moving rod (42) to pass through are formed on both 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). A 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 mold base plate (12). When the limiting block (422) abuts against the fixed mold fixing plate (11), the top surface of the insert body abuts tightly against the top wall of the forming cavity (131) of the cavity plate (13). When the limiting block (422) abuts against the core-pulling rod (41), a gap for molten plastic to pass through is left between the top surface of the insert body and the top wall of the forming cavity (131) of the cavity plate (13).

3. The injection mold for U-shaped bent pipe with inserts according to claim 2, characterized in that: The first driving member 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). Two ends of the first spring (52) respectively abut against the bottom end of the first sliding groove (411) and the bottom end of the moving rod (42). The first spring (52) always drives the moving rod (42) to move upward. The electric cylinder (51) is fixedly arranged on the fixed mold fixing plate (11). A piston rod of the electric cylinder (51) extends toward one side of the moving rod (42) in a direction perpendicular to the mold opening and closing direction. The first pressing block (53) is fixed on the piston rod of the electric cylinder (51). A first chamfer (421) is circumferentially formed at the top end of the moving rod (42). A first inclined surface (531) matching the first chamfer (421) is formed on a side surface of the first pressing block (53) facing the moving rod (42). When the first pressing block (53) moves away from the moving rod (42), the limiting block (422) abuts against the fixed mold fixing plate (11). When the first pressing block (53) completely abuts against the top surface of the moving rod (42), the limiting block (422) abuts against the core pulling rod (41).

4. The injection mold for U-shaped bent pipe with inserts according to claim 3, characterized in that: The second driving member includes a driving rod (61), a second spring (62) and a second pressing block (63). A second sliding groove (423) is formed in the moving rod (42) in the mold opening and closing direction. 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). Two ends of the second spring (62) respectively abut against the bottom wall of the second sliding groove (423) and the bottom wall of the driving rod (61) to drive the driving rod (61) to move upward. The bottom end of the driving rod (61) and one end of the locking block (43) away from the locking groove (33) are slidably connected to each other in an inclined direction through the cooperation of a wedge block (431) and a wedge groove (612). A third sliding groove (424) for the locking block (43) to slide is formed in the moving rod (42). The second pressing block (63) is fixedly arranged on the first pressing block (53) by screws. The second pressing block (63) is located directly above the driving rod (61). An isosceles trapezoidal groove (631) is formed 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). A second chamfer (611) matching the inclined groove wall of the isosceles trapezoidal groove (631) is circumferentially formed at the top end of the driving rod (61).

5. A U-shaped elbow injection mold with inserts according to claim 1, characterized in that: The adaptive member (7) includes a tapered chamfer (71) formed at one end of the locking block (43) facing the locking groove (33) and a tapered chamfer (72) formed at the notch of the locking groove (33).

6. The injection mold for U-shaped bent pipe with inserts according to claim 1, characterized in that: The number and distribution orientation of the locking blocks (43) and the positioning blocks (44) are the same.

7. A U-shaped elbow injection mold with inserts according to claim 1, characterized in that: When the positioning block (44) enters the positioning groove (31), the convex ring (32) always blocks the movable groove (412).

8. The injection mold for U-shaped bent pipe with inserts according to claim 3, characterized in that: An I-shaped groove (111) is formed in the fixed mold clamping plate (11) along the sliding direction of the first pressing block (53). One end of the I-shaped groove (111) communicates with the through groove (14) of the fixed mold clamping plate (11). An I-shaped block (532) is fixed to the bottom of the first pressing block (53). The I-shaped block (532) slides in the I-shaped groove (111). The through groove (14) of the fixed mold clamping plate (11) can allow the I-shaped block (532) to enter and be installed with the I-shaped groove (111).

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