An injection mold

Abstract

The application provides an injection mold and belongs to the technical field of molds. The injection mold solves the problem of low reliability of secondary ordered parting of the existing injection mold. The injection mold comprises a fixed mold, a movable mold and an opening plate. The fixed mold is fixed with a positioning sleeve. The movable mold is fixed with a guide sleeve. A positioning groove is formed on the inner circumferential surface of the positioning sleeve. The guide sleeve is provided with a positioning block capable of radially expanding and contracting. The opening plate is vertically fixed with a guide rod. The guide rod is slidingly inserted into the guide sleeve. When the fixed mold and the movable mold are in a mold closing state, the guide rod can press the positioning block into the positioning groove, so that the guide sleeve and the positioning sleeve are axially positioned. When the opening plate moves away from the movable mold to a parting state, the guide rod can release or disengage the positioning block. The secondary ordered parting of the injection mold is more stable and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of molds and relates to an injection mold. Background Art

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. It has fast production speed, high efficiency, and can be automated. It is suitable for mass production and molding of complex-shaped products. At a certain temperature, the fully molten plastic material is stirred by a screw and injected into the mold cavity with high pressure. After cooling and solidification, the molded product is obtained. After the product is formed, it needs to be demoulded, which involves structures such as ejection and core pulling. Especially for products with complex shapes, core pulling should be performed before the product is ejected to avoid direct ejection and damage to the product. As shown in the attached instructions, Figure 1 As shown, the mold includes a fixed mold 1, a movable mold 2 and an opening plate 3. A slider 101 is connected to the opening plate 3. The lateral translation of the slider 101 can drive the insert 102 to move obliquely for core pulling. Only after core pulling can the movable mold 2 be driven to open the mold. Therefore, the mold requires the opening plate 3 to perform one parting, and then the movable mold 2 to perform a second parting. The two times need to be strictly performed in order, otherwise the product will be damaged.

[0003] In order to ensure that the movable mold is locked during the parting process of the opening plate, a parting hook structure is usually adopted, such as the secondary parting heavy-duty hook structure disclosed in the patent document (application number: 201420004813.3). The upper part of the hook body is longitudinally provided with a strip opening, the lower end of which is fixed on the C plate, and the upper end is provided with a hook portion bent inward and abutted against the middle side of the B plate; a movable block can be movably installed in the mounting cavity of the B plate, and a spring is supported between the movable block and the mounting cavity of the B plate so that the movable block always extends outward and engages with the hook portion of the hook body; a shift block, the upper end of which is fixed on the side of the A plate, and the lower end of which is placed in the strip opening of the hook body. An inclined portion for driving the movable block to retract is provided at the bottom of the shift block. The inclined portion is located below the movable block and has a certain distance from the movable block. When plate A is parted into place once, the shift block will press the movable block, and the movable block will compress the spring and retract. The hook part of the hook body will lose its limit, so that plate C can also be parted for a second time. However, the movable block of this structure is supported by a spring. If the movable block is subject to external interference, the spring will also be compressed, causing the shift block to lose its position. That is, plate A is not parted into place before plate C starts to move, thereby damaging the product. The reliability of using a mold with a parting hook for secondary orderly parting is low. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems in the existing technology and to provide an injection mold, wherein the secondary ordered parting of the injection mold is more stable and reliable.

[0005] The objectives of the present invention can be achieved through the following technical solutions: an injection mold, comprising a fixed mold, a movable mold and an opening plate located outside the movable mold, characterized in that a positioning sleeve is fixed on the fixed mold, a guide sleeve is fixed on the movable mold that can be axially inserted into the positioning sleeve when the mold is closed, a positioning groove is provided on the inner circumference of the positioning sleeve, and a positioning block that can be radially extended and retracted is provided on the guide sleeve, a guide rod is vertically fixed on the opening plate, the guide rod is slidably inserted in the guide sleeve, and when the fixed mold and the movable mold are in the closed mold state, the guide rod can press the positioning block into the positioning groove, so that the guide sleeve and the positioning sleeve form axial positioning, and when the opening plate moves away from the movable mold to the parting state, the guide rod can release or disengage from the positioning block.

[0006] The movable mold and the opening plate are both connected to the injection molding machine. The injection molding machine can drive the movable mold and the opening plate to move respectively. The opening plate can drive the slider and other components to realize core pulling before the movable mold is opened. Specifically, during injection molding, the movable mold and the fixed mold are closed, and the opening plate and the movable mold are close to each other. After the product is formed, the injection molding machine drives the opening plate to move relative to the movable mold to perform parting movement to realize core pulling of the slider. When the opening plate moves into place and is in the parting state, the guide rod releases the positioning block, and the axial positioning of the guide sleeve and the positioning sleeve is released. The injection molding machine drives the movable mold to move to open the mold. The positioning block can be radially retracted under the push of the positioning groove wall, and the movable mold moves with the guide sleeve relative to the positioning sleeve to realize mold opening. Since the outer circumference of the guide rod is always pressed against the inner end of the positioning block during the parting movement of the opening plate, the outer end of the positioning block is always pressed against the positioning groove of the positioning sleeve, and the guide sleeve and the positioning sleeve are always axially positioned together, thereby avoiding the opening movement of the movable mold during the core pulling process of the opening plate parting movement. After the opening plate parting moves into place, the positioning block can be released, thereby releasing the axial positioning between the guide sleeve and the positioning sleeve, thereby ensuring that the orderly secondary parting is more stable and reliable.

[0007] In the aforementioned injection mold, the outer circumference of the guide rod is slidably engaged with the inner circumference of the guide sleeve. A clearance groove is circumferentially formed on the outer circumference of the guide rod. When the opening plate moves away from the movable mold to the parting state, the clearance groove of the guide rod faces the inner end of the positioning block. The outer circumference of the guide rod is in contact with the inner circumference of the guide sleeve, ensuring that the opening plate always presses against the positioning block during the parting movement, thereby locking the movable mold and ensuring parting reliability. When the opening plate moves to the parting state, the clearance groove faces the positioning block, providing clearance space. At this time, when the movable mold tends to open the mold, it can push the positioning block against the positioning block through the wall of the positioning groove, causing the positioning block to move radially inward and fit into the clearance groove.

[0008] In the aforementioned injection mold, the guide sleeve is provided with a plurality of circumferentially distributed sliding holes, each of which is slidably provided with the aforementioned positioning blocks. The width of the positioning blocks along the radial direction of the guide sleeve is greater than the wall thickness of the guide sleeve. When the movable and fixed molds are in the mold closing state, the outer circumference of the guide rod can be pressed against the inner end surface of the positioning block, so that the outer end of the positioning block is pressed tightly into the positioning groove. This allows the positioning block to be embedded in either the positioning groove or the clearance groove, resulting in a stable and reliable structure.

[0009] In the aforementioned injection mold, both long edges of the outer end face of the positioning block are chamfered to form external guide surfaces. The positioning groove is annular and arranged circumferentially along the positioning sleeve. Both walls of the positioning groove are tapered, and the groove width gradually increases from the inside to the outside. When the positioning block is inserted into the positioning groove under the action of the guide rod, the external guide surfaces press against the groove walls of the positioning groove. The positioning block abuts against the positioning groove walls via the inclined external guide surfaces. When the inner end of the positioning block is aligned with the clearance groove, the inclined surfaces cooperate to convert axial thrust on the positioning block into radial thrust, thereby radially pushing the positioning block out of the positioning groove and releasing the axial positioning of the guide sleeve.

[0010] In the aforementioned injection mold, the movable mold is further provided with a spring, which is mounted on the guide sleeve. When the movable and fixed molds are in the closed state, the spring is compressed, exerting an axial thrust on the locating sleeve. When the opening plate is in the parting state, with the clearance groove aligned with the inner end of the locating block, the locating block loses the pressure of the guide rod. The spring's elastic thrust on the movable mold assists in pushing the movable mold, disengaging the locating block from the locating groove. This unlocks the guide sleeve when the movable mold is driven by the injection molding machine, making the entire secondary parting process more reliable.

[0011] In the above-mentioned injection mold, the inner end face of the positioning block is a matching cambered surface adapted to the outer circumference of the guide rod, and the two long edges of the matching cambered surface are chamfered to form an inner guide surface. The two groove walls of the clearance groove are both conical surfaces, and the groove width of the clearance groove gradually increases from the inside to the outside. When the positioning block is inserted into the clearance groove under the action of the positioning sleeve, the inner guide surface is pressed against the groove wall of the clearance groove. The inner end face of the positioning block is a matching cambered surface adapted to the outer circumference of the guide rod, so that the outer circumference of the guide rod can stably abut against the inner end of the positioning block, ensuring the stability and reliability of the axial positioning of the guide sleeve and the positioning sleeve. The inner guide surface can, when the outer end of the positioning block is opposite to the positioning groove after the movable mold is closed and reset, the groove wall of the guide rod's clearance groove pushes the positioning block, so that the positioning block is embedded in the positioning groove.

[0012] In the aforementioned injection mold, the positioning block has a strip-shaped retaining groove on its side, radially extending from the guide sleeve. A retaining pin is fixed to the side of the guide sleeve's slide hole. The retaining pin is axially disposed along the guide sleeve, with one end of the retaining pin inserted into the retaining groove. The end of the retaining groove, inserted into the retaining groove, prevents the positioning block from falling out of the slide hole, ensuring structural stability.

[0013] In the aforementioned injection mold, a mounting hole is defined in the movable mold. The end of the guide sleeve facing the retaining plate is inserted into the mounting hole. The end of the guide sleeve inserted into the mounting hole has an annular retaining ridge around its periphery. A retaining sleeve is also secured within the mounting hole, with its inner end pressed against the retaining ridge. A clearance cavity is formed between the inner circumference of the retaining sleeve and the outer circumference of the guide sleeve, and the spring is disposed within the clearance cavity. The mounting hole is a stepped through-hole, and the guide sleeve is secured to the larger end of the mounting hole by the retaining sleeve. The retaining sleeve is compressed against the movable mold by a pressure ring, facilitating assembly. The clearance cavity formed between the retaining sleeve and the guide sleeve is used to accommodate the spring, resulting in a stable and compact structure.

[0014] In the aforementioned injection mold, a push sleeve is provided on the guide sleeve's upper sliding sleeve, one end of which is located within the clearance cavity. One end of the aforementioned spring presses against the guide sleeve's fixed ridge, while the other end presses against the inner end face of the push sleeve. Under the action of the spring, the outer end of the push sleeve presses against the end face of the positioning sleeve when the movable and fixed molds are in the clamped state. When the movable and fixed molds are in the clamped state, the push sleeve retracts into the mounting hole. When the positioning block aligns with the clearance groove, the push sleeve pushes against the positioning sleeve, thereby generating a reverse thrust on the movable mold. The structural design in which the push sleeve extends can keep the clearance cavity closed, preventing foreign matter from entering the clearance cavity and ensuring the stability and reliability of the overall structure.

[0015] In the aforementioned injection mold, a limit bolt is vertically fixed to the side of the movable mold facing the opening plate. The opening plate has a limit hole, into which the limit bolt is inserted. A limit portion is formed circumferentially along the edge of the opening of the limit hole. When the opening plate is in the parting state, the head of the limit bolt can abut against the limit portion. When the opening plate moves to the parting state, the head of the limit bolt can hook onto the limit portion, so that the force on the opening plate assists the movement of the movable mold, ensuring that the two move synchronously for the secondary parting.

[0016] Compared with the existing technology, this injection mold has the following advantages:

[0017] 1. Since the outer circumference of the guide rod is always pressed against the inner end of the positioning block during the parting movement of the opening plate, the outer end of the positioning block is always pressed against the positioning groove of the positioning sleeve. The guide sleeve and the positioning sleeve are always axially positioned together, thereby avoiding the opening movement of the movable mold during the core pulling process of the opening plate parting movement, which may cause the product to be stretched.

[0018] 2. Since the guide sleeve and the positioning sleeve are always axially positioned during the opening plate parting movement, the positioning block can be released only after the opening plate parting moves into place, thereby releasing the axial positioning between the guide sleeve and the positioning sleeve, thereby ensuring that the orderly secondary parting is more stable and reliable.

[0019] 3. As there is also a push sleeve and a spring, when the opening plate is in the parting state so that the clearance groove is opposite to the inner end of the positioning block, the positioning block loses the top pressure of the guide rod, and the elastic thrust of the spring on the movable mold can assist in pushing the movable mold, so that the positioning block is out of the positioning groove, so that the guide sleeve is in the unlocked state when the injection molding machine drives the movable mold, and the entire secondary parting process is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the existing mold.

[0021] Figure 2 It is a structural front view of this injection mold.

[0022] Figure 3 yes Figure 2 Partial structural cross-sectional view at AA in the middle.

[0023] Figure 4 yes Figure 3 A magnified view of the structure at point B.

[0024] Figure 5 yes Figure 3 Cross-sectional view of the local structure at CC in the middle.

[0025] Figure 6 yes Figure 3 Enlarged view of the structure at point D in the middle.

[0026] Figure 7 It is a structural diagram of the opening plate of the injection mold when it is in the first parting stage.

[0027] Figure 8 It is a structural diagram of the movable mold of the injection mold when it is in the secondary parting stage.

[0028] In the figure, 1, fixed mold; 11, fixing hole; 2, movable mold; 21, mounting hole; 22, give way cavity; 23, limiting bolt; 3, opening plate; 31, guide rod; 311, give way groove; 32, limiting hole; 321, limiting part; 4, positioning sleeve; 41, positioning groove; 42, guide cone; 43, annular ridge; 5, guide sleeve; 51, sliding hole; 52, limiting pin; 53, fixing ridge; 6, positioning block; 61, outer guide surface; 62, inner guide surface; 63, matching arc surface; 64, limiting groove; 7, spring; 8, fixing sleeve; 81, limiting ridge; 9, push sleeve; 91, abutment part; 10, pressure ring; 101, slider; 102, insert. DETAILED DESCRIPTION

[0029] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0030] like Figure 2 、 Figure 3 As shown, an injection mold includes a fixed mold 1, a movable mold 2, and an opening plate 3. The opening plate 3 is located outside the movable mold 2. The movable mold 2 and the opening plate 3 are both connected to an injection molding machine, which can drive the movable mold 2 and the opening plate 3 to move respectively. The opening plate 3 can move relative to the movable mold 2 before the movable mold 2 is opened. A positioning sleeve 4 is fixed to the fixed mold 1, and a guide sleeve 5 is fixed to the movable mold 2. The guide sleeve 5 extends out of the parting surface of the movable mold 2 and can be axially inserted into the positioning sleeve 4 when the mold is closed. A positioning groove 41 is provided on the inner circumference of the positioning sleeve 4, and a positioning block 6 that can be radially extended is provided on the guide sleeve 5. A guide rod 31 is vertically fixed on the side of the opening plate 3 facing the movable mold 2. The guide rod 31 is slidably inserted into the guide sleeve 5, and the outer circumference of the guide rod 31 is slidably matched with the inner circumference of the guide sleeve 5. When the fixed mold 1 and the movable mold 2 are in the mold closing state, the guide rod 31 can press the positioning block 6 into the positioning groove 41, so that the guide sleeve 5 and the positioning sleeve 4 are axially positioned. Figure 7 As shown, a clearance groove 311 is opened on the outer circumference of the guide rod 31. When the opening plate 3 moves away from the movable mold 2 to the parting state, the clearance groove 311 of the guide rod 31 is opposite to the inner end of the positioning block 6. Figure 8 As shown, when the movable mold 2 moves apart relative to the fixed mold 1 , the outer end of the positioning block 6 is separated from the positioning groove 41 , and the inner end is embedded in the clearance groove 311 .

[0031] Specifically, combined Figure 4 、 Figure 5As shown, three sliding holes 51 are formed through the guide sleeve 5. These three sliding holes 51 are distributed along the circumference of the guide sleeve 5, with two of the sliding holes 51 located on either side of the guide sleeve 5 and one located on the upper portion of the guide sleeve 5. There are three positioning blocks 6, each slidably disposed within the sliding holes 51. The width of the positioning blocks 6 along the radial direction of the guide sleeve 5 is greater than the wall thickness of the guide sleeve 5. The inner end surface of the positioning block 6 is a mating arc surface 63, which is adapted to the outer circumference of the guide rod 31. When the movable mold 2 and the fixed mold 1 are in the mold closing state, the outer circumference of the guide rod 31 can be pressed against the mating arc surface 63 of the positioning block 6, so that the outer end of the positioning block 6 is pressed tightly within the positioning groove 41. The two long edges of the outer end surface of the positioning block 6 are chamfered to form an outer guide surface 61. The positioning groove 41 is annular and arranged circumferentially along the positioning sleeve 4. The two groove walls of the positioning groove 41 are tapered, and the groove width of the positioning groove 41 gradually increases from the inside to the outside. When the positioning block 6 is inserted into the positioning groove 41 under the action of the matching arc surface 63, the outer guide surface 61 presses against the groove wall of the positioning groove 41. The two long edges of the matching arc surface 63 are chamfered to form an inner guide surface 62. The two groove walls of the clearance groove 311 are tapered, and the groove width of the clearance groove 311 gradually increases from the inside to the outside. When the positioning block 6 is inserted into the clearance groove 311 under the action of the positioning sleeve 4, the inner guide surface 62 presses against the groove wall of the clearance groove 311. The inner edge of the opening of the positioning sleeve 4 facing the movable mold 2 is circumferentially provided with a guide tapered surface 42 to prevent interference between the guide sleeve 5 and the positioning block 6 during insertion. The side of the positioning block 6 is provided with a strip-shaped limiting groove 64 radially extending from the guide sleeve 5. A limiting pin 52 is fixed to the side of the guide sleeve 5 on the side of the sliding hole 51. The limiting pin 52 is arranged axially along the guide sleeve 5, and one end of the limiting pin 52 is inserted into the limiting groove 64. A fixing hole 11 is provided on the side of the fixed mold 1 facing the movable mold 2. This fixing hole 11 is a stepped hole. The outer circumferential surface of the positioning sleeve 4 has an annular ridge 43, which is inserted into the connecting hole. A pressure ring 10 is also fixed to the fixed mold 1 via bolts. This pressure ring 10 presses the annular ridge 43 against the stepped surface of the connecting hole.

[0032] Combine Figure 6As shown, a mounting hole 21 is provided on the side of the movable mold 2 facing the fixed mold 1. The mounting hole 21 is a stepped through hole. One end of the guide sleeve 5 facing the opening plate 3 is inserted into the mounting hole 21, and the other end extends out of the mounting hole 21. One end of the guide sleeve 5 inserted into the mounting hole 21 has an annular fixed ridge 53 in the circumference. A fixed sleeve 8 is also inserted into the mounting hole 21. A pressure ring 10 is also fixed to the movable mold 2 by bolts. The pressure ring 10 presses the fixed sleeve 8 into the mounting hole 21 so that the inner end of the fixed sleeve 8 is pressed against the fixed ridge 53. The inner edge of the outer end opening of the fixed sleeve 8 is circumferentially provided with an annular limiting convex edge 81, so that a clearance cavity 22 is formed between the inner circumference of the fixed sleeve 8 and the outer circumference of the guide sleeve 5. The sliding sleeve on the guide sleeve 5 is provided with a push sleeve 9, the inner end of the push sleeve 9 is located in the clearance cavity 22, and the inner end outer circumference of the push sleeve 9 is provided with a supporting portion 91, and the outer end extends from between the inner circumference of the limiting convex edge 81 and the outer circumference of the guide sleeve 5. A spring 7 is also provided on the guide sleeve 5 in the clearance cavity 22, one end of the spring 7 is pressed against the fixed convex edge 53 of the guide sleeve 5, and the other end is pressed against the inner end surface of the push sleeve 9. Under the action of the spring 7, when the movable mold 2 and the fixed mold 1 are in the mold closing state, the outer end of the push sleeve 9 is pressed against the end surface of the positioning sleeve 4. When the movable mold 2 is separated from the fixed mold 1, the outer end of the push sleeve 9 extends out of the mounting hole 21, and the supporting portion 91 is pressed against the limiting convex edge 81. A limiting bolt 23 is vertically fixed on the side of the movable mold 2 facing the opening plate 3. A limiting hole 32 is provided on the opening plate 3. The limiting bolt 23 is inserted into the limiting hole 32. A limiting portion 321 is provided on the circumferential edge of the opening of the limiting hole 32. When the opening plate 3 is in the parting state, the head of the limiting bolt 23 can rest against the limiting portion 321.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0034] Although this document frequently uses terms such as fixed die 1, fixed hole 11, and movable die 2, the use of other terms is not excluded. These terms are used solely to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. An injection mold, comprising a fixed mold (1), a movable mold (2) and an opening plate (3) located outside the movable mold (2), characterized in that: A positioning sleeve (4) is fixed on the fixed mold (1), a guide sleeve (5) is fixed on the movable mold (2) and can be axially inserted into the positioning sleeve (4) when the mold is closed, a positioning groove (41) is provided on the inner circumference of the positioning sleeve (4), a positioning block (6) that can be radially extended is provided on the guide sleeve (5), a guide rod (31) is vertically fixed on the opening plate (3), the guide rod (31) is slidably inserted in the guide sleeve (5), and when the fixed mold (1) and the movable mold (2) are in the closed state, the guide rod (31) can press the positioning block (6) The guide sleeve (5) and the positioning sleeve (4) are tightly fitted in the positioning groove (41), so that the guide sleeve (5) and the positioning sleeve (4) are axially positioned. When the opening plate (3) moves away from the movable mold (2) to the parting state, the guide rod (31) can be released or separated from the positioning block (6); the outer peripheral surface of the guide rod (31) is slidably matched with the inner peripheral surface of the guide sleeve (5), and a clearance groove (311) is opened on the outer peripheral surface of the guide rod (31) in the circumferential direction. When the opening plate (3) moves away from the movable mold (2) to the parting state, the clearance groove (311) of the guide rod (31) is opposite to the inner end of the positioning block (6).

2. The injection mold according to claim 1, characterized in that The guide sleeve (5) is provided with a plurality of sliding holes (51) distributed along the circumferential direction, and the positioning blocks (6) are slidably arranged in the sliding holes (51). The width of the positioning blocks (6) along the radial direction of the guide sleeve (5) is greater than the wall thickness of the guide sleeve (5). When the movable mold (2) and the fixed mold (1) are in a mold-clamping state, the outer peripheral surface of the guide rod (31) can be pressed against the inner end surface of the positioning block (6), so that the outer end of the positioning block (6) is pressed into the positioning groove (41).

3. The injection mold according to claim 2, characterized in that Both long edges of the outer end surface of the positioning block (6) are chamfered to form an outer guide surface (61). The positioning groove (41) is annular and arranged along the circumference of the positioning sleeve (4). Both groove walls of the positioning groove (41) are conical surfaces, and the groove width of the positioning groove (41) gradually increases from the inside to the outside. When the positioning block (6) is embedded in the positioning groove (41) under the action of the guide rod (31), the outer guide surface (61) is pressed against the groove wall of the positioning groove (41).

4. The injection mold according to claim 3, characterized in that The movable mold (2) is further provided with a spring (7), which is sleeved on the guide sleeve (5). When the movable mold (2) and the fixed mold (1) are in a mold-clamping state, the spring (7) is compressed and generates an axial thrust on the positioning sleeve (4).

5. The injection mold according to any one of claims 2 to 4, characterized in that: The inner end surface of the positioning block (6) is a matching arc surface (63) adapted to the outer peripheral surface of the guide rod (31), and both long edges of the matching arc surface (63) are chamfered to form an inner guide surface (62). Both groove walls of the clearance groove (311) are conical surfaces, and the groove width of the clearance groove (311) gradually increases from the inside to the outside. When the positioning block (6) is embedded in the clearance groove (311) under the action of the positioning sleeve (4), the inner guide surface (62) is pressed against the groove wall of the clearance groove (311).

6. The injection mold according to any one of claims 2 to 4, characterized in that A strip-shaped limiting groove (64) is provided on the side surface of the positioning block (6) along the radial direction of the guide sleeve (5). A limiting pin (52) is fixed on the side of the slide hole (51) of the guide sleeve (5). The limiting pin (52) is arranged axially along the guide sleeve (5), and one end of the limiting pin (52) is inserted into the limiting groove (64).

7. The injection mold according to claim 4, characterized in that: The movable mold (2) is provided with a mounting hole (21), one end of the guide sleeve (5) facing the opening plate (3) is inserted into the mounting hole (21), and the end of the guide sleeve (5) inserted into the mounting hole (21) has an annular fixed convex edge (53) in the circumferential direction. A fixed sleeve (8) is also fixed in the mounting hole (21), and the inner end of the fixed sleeve (8) is pressed against the fixed convex edge (53). A clearance cavity (22) is formed between the inner circumferential surface of the fixed sleeve (8) and the outer circumferential surface of the guide sleeve (5), and the spring (7) is arranged in the clearance cavity (22).

8. The injection mold according to claim 7, characterized in that: The sliding sleeve on the guide sleeve (5) is provided with a push sleeve (9), one end of the push sleeve (9) is located in the clearance cavity (22), one end of the spring (7) is pressed against the fixed convex edge (53) of the guide sleeve (5), and the other end is pressed against the inner end face of the push sleeve (9), and under the action of the spring (7), when the movable mold (2) and the fixed mold (1) are in the mold closing state, the outer end of the push sleeve (9) is pressed against the end face of the positioning sleeve (4).

9. The injection mold according to any one of claims 1 to 4, characterized in that: A limiting bolt (23) is vertically fixed on the side of the movable mold (2) facing the opening plate (3), and a limiting hole (32) is provided on the opening plate (3). The limiting bolt (23) is inserted into the limiting hole (32), and a limiting portion (321) is provided on the circumferential edge of the opening of the limiting hole (32). When the opening plate (3) is in a parting state, the head of the limiting bolt (23) can abut against the limiting portion (321).

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