CN219543890U - Injection mold - Google Patents

Abstract

The utility model provides an injection mold, and belongs to the technical field of molds. The problem that the secondary ordered parting reliability of the existing injection mold is low is solved. The injection mold comprises a fixed mold, a movable mold and a baffle opening plate, wherein a positioning sleeve is fixed on the fixed mold, a guide sleeve is fixed on the movable mold, a positioning groove is formed in the inner peripheral surface of the positioning sleeve, a positioning block capable of radially stretching is arranged on the guide sleeve, a guide rod is vertically fixed on the baffle opening plate and is slidably inserted in the guide sleeve, and when the fixed mold and the movable mold are in a mold closing state, the guide rod can compress the positioning block in the positioning groove, so that the guide sleeve and the positioning sleeve form axial positioning, and when the baffle opening plate is far away from the movable mold and moves to a parting state, the guide rod can be released or separated from the positioning block. The secondary ordered parting of the injection mold is more stable and reliable.

Description

Injection mold

Technical Field

The utility model belongs to the technical field of molds, and relates to an injection mold.

Background

Injection molding is also called injection molding, which is a molding method for injection and molding, has high production speed and high efficiency, can realize automation of operation, is suitable for the molding processing fields of mass production, products with complex shapes and the like, and is characterized in that at a certain temperature, a plastic material which is completely melted by stirring a screw rod is injected into a cavity by high pressure, and a molded product is obtained after cooling and solidification, and demolding is needed after the product is molded, so that the injection molding method relates to structures such as pushing and pulling, and particularly for the products with complex shapes, the pulling is carried out before the product is ejected, and the direct ejection of the product is avoided from damaging the product. As shown in fig. 1 of the specification, the mold comprises a fixed mold 1, a movable mold 2 and a baffle opening plate 3, wherein the baffle opening plate 3 is connected with a sliding block 101, the sliding block 101 transversely translates to drive an insert 102 to obliquely move for core pulling, and the movable mold 2 can be driven to open after core pulling, so that the mold needs to be subjected to primary parting by the baffle opening plate 3, then the movable mold 2 is subjected to secondary parting, and the two steps need to be strictly and orderly performed, otherwise, products can be damaged.

In order to ensure that the movable mould is locked in the parting process of the baffle plate, a parting drag hook structure is generally adopted, such as a secondary parting heavy drag hook structure disclosed in patent document (application number: 201420004813.3), the upper part of the drag hook main body is longitudinally provided with a strip-shaped opening, the lower end of the drag hook main body is fixed on the C plate, and the upper end of the drag hook main body is provided with a hook part which is bent inwards to prop against the middle side part of the B plate; the movable block can be movably arranged in the installation cavity of the B plate left and right, and a spring which enables the movable block to be outwards extended all the time and is buckled with the hook part of the drag hook main body is supported between the movable block and the installation cavity of the B plate; the upper end of the shifting block is fixed at the side part of the A plate, the lower end of the shifting block is arranged in the strip-shaped opening of the drag hook main body, the bottom of the shifting block is provided with a bevel part used for driving the movable block to shrink inwards, and the bevel part is positioned below the movable block and has a certain distance with the movable block. When the A plate is in place in one-time parting, the shifting block can press the movable block, the movable block compresses the spring and contracts, the hook part of the drag hook main body is lost to be limited, so that the C plate can be secondarily parting, but the movable block of the structure is supported through the spring, if the movable block is interfered by the outside, the spring can be compressed, so that the shifting block is lost to be positioned, namely, the C plate which is not in place in parting starts to move in one-time parting, thereby damaging a product, and the reliability of secondary ordered parting by adopting a mold of the parting drag hook is lower.

Disclosure of Invention

The utility model aims at solving the problems in the prior art, and provides an injection mold, and the secondary ordered parting of the injection mold is more stable and reliable.

The aim of the utility model can be achieved by the following technical scheme: the injection mold comprises a fixed mold, a movable mold and an opening baffle plate positioned outside the movable mold, and is characterized in that a positioning sleeve is fixed on the fixed mold, a guide sleeve which can be axially inserted into the positioning sleeve when the movable mold is fixed on the movable mold, a positioning groove is formed in the inner circumferential surface of the positioning sleeve, a positioning block which can radially stretch out and draw back is arranged on the guide sleeve, a guide rod is vertically fixed on the opening baffle plate, the guide rod is slidably inserted into the guide sleeve, and when the fixed mold and the movable mold are in a mold closing state, the guide rod can compress the positioning block in the positioning groove, so that the guide sleeve and the positioning sleeve form axial positioning, and when the opening baffle plate is far away from the movable mold, the guide rod can be released or separated from the positioning block when the movable mold moves to a parting state.

The movable mould and the baffle are connected with the injection moulding machine, the injection moulding machine can respectively drive the movable mould and the baffle to move, the baffle can drive parts such as a sliding block and the like to realize core pulling before the movable mould is opened, specifically, the movable mould and the fixed mould are closed during injection moulding, the baffle is close to and abutted against the movable mould, the baffle is driven to move relative to the movable mould to perform parting movement firstly after the product is formed, the sliding block is realized to loose core, when the baffle is moved to a parting state, the guide rod releases the positioning block, the axial positioning of the guide sleeve and the positioning sleeve is released, the movable mould is driven by the injection moulding machine to perform mold opening movement, the positioning block can radially retract under the pushing of the groove wall of the positioning groove, and the movable mould is driven by the guide sleeve to move relative to the positioning sleeve, so that the mould opening is realized. Because the outer peripheral surface of the guide rod is always pressed at the inner end of the positioning block in the parting movement process of the parting plate, the outer end of the positioning block is always pressed in the positioning groove of the positioning sleeve, and the guide sleeve and the positioning sleeve are always axially positioned together, so that the parting movement of the parting plate is avoided, the mold opening movement of the movable mold in the core pulling process is avoided, the positioning block can be released after the parting movement of the parting plate is in place, the axial positioning between the guide sleeve and the positioning sleeve is relieved, and the ordered secondary parting is ensured to be more stable and reliable.

In the injection mold, the outer peripheral surface of the guide rod is in sliding fit with the inner peripheral surface of the guide sleeve, the outer peripheral surface of the guide rod is circumferentially provided with the abdication groove, and when the gear opening plate moves away from the movable mold to a parting state, the abdication groove of the guide rod is opposite to the inner end of the positioning block. The outer peripheral surface of the guide rod is attached to the inner peripheral surface of the guide sleeve, the positioning block is always pressed in the parting movement process of the parting plate, the movable mould is locked, parting reliability is guaranteed, the abdication groove is opposite to the positioning block after the parting plate moves to a parting state, an abdication space is provided, and at the moment, the movable mould can push the positioning block through the groove wall of the positioning groove when the movable mould has a parting movement trend, so that the positioning block moves radially inwards and is embedded into the abdication groove.

In the injection mold, the guide sleeve is provided with a plurality of sliding holes distributed along the circumferential direction in a penetrating manner, the positioning blocks are arranged in the sliding holes in a sliding manner, the radial width of each positioning block along the guide sleeve is larger than the wall thickness of the guide sleeve, and when the movable mold and the fixed mold are in a mold closing state, the outer circumferential surface of the guide rod can be tightly pressed on the inner end surface of each positioning block, so that the outer ends of the positioning blocks are tightly pressed in the positioning grooves. The positioning block is embedded into the positioning groove or the yielding groove, and the structure is stable and reliable.

In the injection mold, the two long edges of the outer end face of the positioning block form outer guide faces through chamfering, the positioning groove is annular and circumferentially arranged along the positioning sleeve, two groove walls of the positioning groove are conical surfaces, the groove width of the positioning groove gradually increases from inside to outside, and when the positioning block is embedded into the positioning groove under the action of the guide rod, the outer guide faces are tightly pressed on the groove walls of the positioning groove. The locating block is abutted with the groove wall of the locating groove through the inclined outer guide surface, when the inner end of the locating block is opposite to the yielding groove, the inclined plane is matched with the locating groove, so that the axial thrust of the locating block can be converted into radial thrust, the locating block is pushed radially and separated from the locating groove, and the axial positioning of the guide sleeve is relieved.

In the injection mold, the movable mold is further provided with a spring, the spring is sleeved on the guide sleeve, and when the movable mold and the fixed mold are in a mold closing state, the spring is compressed and generates axial thrust to the positioning sleeve. When the gear opening plate is in the parting state so that the yielding groove is opposite to the inner end of the positioning block, the positioning block loses the jacking force of the guide rod, the elastic thrust of the spring to the movable die can assist in pushing the movable die, so that the positioning block is separated from the positioning groove, and the guide sleeve is in an unlocking state when the movable die is driven by the injection molding machine, and the whole secondary parting process is more reliable.

In the injection mold, the inner end surface of the positioning block is a matched cambered surface which is matched with the outer circumferential surface of the guide rod, two long edges of the matched cambered surface form inner guide surfaces through chamfering, two groove walls of the yielding groove are conical surfaces, the groove width of the yielding groove gradually becomes larger from inside to outside, and when the positioning block is embedded into the yielding groove under the action of the positioning sleeve, the inner guide surfaces are pressed on the groove walls of the yielding groove. The inner end face of the positioning block is a matched cambered surface and is adapted to the outer peripheral face of the guide rod, so that the outer peripheral face of the guide rod can be stably abutted against the inner end of the positioning block, the axial positioning stability and reliability of the guide sleeve and the positioning sleeve are ensured, and when the outer end of the positioning block is opposite to the positioning groove after the movable die is closed and reset, the groove wall of the abdicating groove of the guide rod pushes the positioning block, so that the positioning block is embedded into the positioning groove.

In the injection mold, the side surface of the positioning block is radially provided with the strip-shaped limiting groove along the guide sleeve, the guide sleeve is fixedly provided with the limiting pins at the slide Kong Cebu, the limiting pins are axially arranged along the guide sleeve, and one end of each limiting pin is inserted into the limiting groove. The end part of the limiting groove is inserted into the limiting groove, so that the positioning block can be prevented from falling off from the sliding hole, and the structural stability is ensured.

In the injection mold, the movable mold is provided with the mounting hole, one end of the guide sleeve, facing the baffle plate, is inserted into the mounting hole, an annular fixing convex edge is arranged at one circumferential end of the guide sleeve, inserted into the mounting hole, a fixing sleeve is further fixed in the mounting hole, the inner end of the fixing sleeve is pressed on the fixing convex edge, a yielding cavity is formed between the inner circumferential surface of the fixing sleeve and the outer circumferential surface of the guide sleeve, and the spring is arranged in the yielding cavity. The mounting hole is a step-shaped through hole, the guide sleeve is fixedly pressed in one end with larger aperture of the mounting hole through the fixing sleeve, the fixing sleeve is pressed on the movable die through the pressing ring, the assembly is convenient, and the abdication cavity formed between the fixing sleeve and the guide sleeve is used for mounting the spring, so that the structure is stable and compact.

In the injection mold, the guide sleeve is provided with the pushing sleeve in a sliding manner, one end of the pushing sleeve is positioned in the abdication cavity, one end of the spring is propped against the fixed convex edge of the guide sleeve, the other end of the spring is propped against the inner end surface of the pushing sleeve, and the outer end of the pushing sleeve is propped against the end surface of the positioning sleeve under the action of the spring when the movable mold and the fixed mold are in a mold closing state. When the movable die and the fixed die are in a die closing state, the pushing sleeve is retracted into the mounting hole, and when the positioning block is opposite to the abdication groove, the pushing sleeve can push the positioning sleeve, so that reverse thrust is generated on the movable die, the abdication cavity is in a closed state by adopting the structure design that the pushing sleeve extends out, foreign matters are prevented from entering the abdication cavity, and the stability and the reliability of the integral structure are ensured.

In the injection mold, the side surface of the movable mold facing the baffle plate is vertically fixed with a limit bolt, the baffle plate is provided with a limit hole, the limit bolt is inserted into the limit hole, a limit part is arranged on the periphery of the hole opening edge of the limit hole, and when the baffle plate is in a parting state, the head part of the limit bolt can be abutted against the limit part. When the baffle plate is moved to the parting state, the head of the limit bolt can hook the limit part, so that the acting force on the baffle plate assists the movable mould to move, and the two are ensured to synchronously move to perform secondary parting.

Compared with the prior art, the injection mold has the following advantages:

1. because the outer peripheral surface of the guide rod is always pressed at the inner end of the positioning block in the parting movement process of the parting plate, the outer end of the positioning block is always pressed in the positioning groove of the positioning sleeve, and the guide sleeve and the positioning sleeve are always axially positioned together, so that the phenomenon that a product is pulled due to the mold opening movement of the movable mold in the parting movement of the parting plate in the core pulling process is avoided.

2. The guide sleeve and the positioning sleeve are axially positioned all the time in the parting movement process of the parting plate, and the positioning block can be released after the parting plate is parting moved in place, so that the axial positioning between the guide sleeve and the positioning sleeve is relieved, and the ordered secondary parting is ensured to be more stable and reliable.

3. The pushing sleeve and the spring are further arranged, when the gear opening plate is in the parting state so that the yielding groove is opposite to the inner end of the positioning block, the positioning block loses the pushing of the guide rod, the elastic pushing force of the spring to the movable die can assist in pushing the movable die, so that the positioning block is separated from the positioning groove, and the guide sleeve is in an unlocking state when the movable die is driven by the injection molding machine, and the whole secondary parting process is more reliable.

Drawings

Fig. 1 is a schematic structural view of a conventional mold.

Fig. 2 is a structural elevation view of the present injection mold.

Fig. 3 is a partial structural cross-sectional view at A-A in fig. 2.

Fig. 4 is an enlarged view of the structure at B in fig. 3.

Fig. 5 is a partial structural cross-sectional view at C-C in fig. 3.

Fig. 6 is an enlarged view of the structure at D in fig. 3.

Fig. 7 is a schematic view of the structure of the opening plate of the injection mold in one parting.

Fig. 8 is a schematic diagram of the structure of the movable mold of the injection mold in the secondary parting.

In the figure, 1, a fixed mold; 11. a fixing hole; 2. a movable mold; 21. a mounting hole; 22. a relief cavity; 23. a limit bolt; 3. a baffle plate is opened; 31. a guide rod; 311. a relief groove; 32. a limiting hole; 321. a limit part; 4. a positioning sleeve; 41. a positioning groove; 42. introducing a conical surface; 43. an annular convex edge; 5. guide sleeve; 51. a slide hole; 52. a limiting pin; 53. fixing the convex edge; 6. a positioning block; 61. an outer guide surface; 62. an inner guide surface; 63. matching with the cambered surface; 64. a limit groove; 7. a spring; 8. a fixed sleeve; 81. limiting convex edges; 9. pushing the sleeve; 91. an abutting portion; 10. a compression ring; 101. a slide block; 102. and (3) an insert.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

As shown in fig. 2 and 3, an injection mold comprises a fixed mold 1, a movable mold 2 and a baffle opening plate 3, wherein the baffle opening plate 3 is positioned at the outer side of the movable mold 2, the movable mold 2 and the baffle opening plate 3 are both connected with an injection molding machine, the injection molding machine can respectively drive the movable mold 2 and the baffle opening plate 3 to move, and the baffle opening plate 3 can move in a parting manner relative to the movable mold 2 before the movable mold 2 is opened. A positioning sleeve 4 is fixed on the fixed die 1, a guide sleeve 5 is fixed on the movable die 2, the guide sleeve 5 extends out of the parting surface of the movable die 2, and the guide sleeve 5 can be axially inserted into the positioning sleeve 4 during die assembly. The positioning sleeve 4 is provided with a positioning groove 41 on the inner peripheral surface, the guide sleeve 5 is provided with a positioning block 6 which can radially stretch out and draw back, the side surface of the baffle 3 facing the movable die 2 is vertically fixed with a guide rod 31, the guide rod 31 is slidably inserted into the guide sleeve 5, the outer peripheral surface of the guide rod 31 is slidably matched with the inner peripheral surface of the guide sleeve 5, and when the fixed die 1 and the movable die 2 are in a die closing state, the guide rod 31 can compress the positioning block 6 in the positioning groove 41, so that the guide sleeve 5 and the positioning sleeve 4 form axial positioning. Referring to fig. 7, a relief groove 311 is circumferentially formed on the outer peripheral surface of the guide rod 31, and when the notch board 3 moves away from the movable die 2 to a parting state, the relief groove 311 of the guide rod 31 is opposite to the inner end of the positioning block 6. As shown in fig. 8, when the movable mold 2 moves away from 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 into the yielding groove 311.

Specifically, as shown in fig. 4 and 5, three sliding holes 51 are formed in the guide sleeve 5 in a penetrating manner, the three sliding holes 51 are distributed along the circumferential direction of the guide sleeve 5, two sliding holes 51 are respectively located at two sides of the guide sleeve 5, the other sliding hole is located at the upper portion of the guide sleeve 5, three positioning blocks 6 are respectively arranged in the sliding holes 51 in a sliding manner, and the radial width of each positioning block 6 along the guide sleeve 5 is larger than the wall thickness of the guide sleeve 5. The inner end surface of the positioning block 6 is a matched cambered surface 63, the matched cambered surface 63 is matched with the outer circumferential surface of the guide rod 31, and when the movable die 2 and the fixed die 1 are in a die clamping state, the outer circumferential surface of the guide rod 31 can be pressed on the matched cambered surface 63 of the positioning block 6, so that the outer end of the positioning block 6 is pressed in 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 is circumferentially arranged along the positioning sleeve 4, two groove walls of the positioning groove 41 are conical surfaces, the groove width of the positioning groove 41 gradually increases from inside to outside, and when the positioning block 6 is embedded into the positioning groove 41 under the action of the matched cambered surface 63, the outer guide surface 61 is tightly pressed on the groove wall of the positioning groove 41. The two long edges of the matched cambered surface 63 are chamfered to form an inner guide surface 62, the two groove walls of the yielding groove 311 are conical surfaces, the groove width of the yielding groove 311 is gradually increased from inside to outside, and when the positioning block 6 is embedded into the yielding groove 311 under the action of the positioning sleeve 4, the inner guide surface 62 is pressed on the groove wall of the yielding groove 311. The inner edge of the positioning sleeve 4, which faces one end orifice of the movable die 2, is circumferentially provided with a guiding conical surface 42 so as to avoid interference with the positioning block 6 when the guide sleeve 5 is inserted. A strip-shaped limit groove 64 is formed in the side surface of the positioning block 6 along the radial direction of the guide sleeve 5, limit pins 52 are fixed on the side parts of the sliding holes 51 of the guide sleeve 5, the limit pins 52 are axially arranged along the guide sleeve 5, and one end of each limit pin 52 is inserted into the limit groove 64. The fixed die 1 is provided with a fixing hole 11 on the side face facing the movable die 2, the fixing hole 11 is a step hole, an annular convex edge 43 is circumferentially arranged on the outer peripheral surface of the positioning sleeve 4, the positioning sleeve 4 is inserted into the connecting hole, the fixed die 1 is also fixedly provided with a pressing ring 10 through a bolt, and the annular convex edge 43 is pressed on the step surface of the connecting hole by the pressing ring 10.

As shown in fig. 6, the side surface of the movable mold 2 facing the fixed mold 1 is provided with a mounting hole 21, the mounting hole 21 is a step-shaped through hole, one end of the guide sleeve 5 facing the baffle 3 is inserted into the mounting hole 21, the other end extends out of the mounting hole 21, one end of the guide sleeve 5 inserted into the mounting hole 21 is circumferentially provided with an annular fixing flange 53, the mounting hole 21 is also inserted with a fixing sleeve 8, the movable mold 2 is also fixedly provided with a compression ring 10 through bolts, and the compression ring 10 compresses the fixing sleeve 8 in the mounting hole 21, so that the inner end of the fixing sleeve 8 is compressed on the fixing flange 53. The inner edge of the hole at the outer end of the fixed sleeve 8 is circumferentially provided with an annular limiting flange 81, a yielding cavity 22 is formed between the inner peripheral surface of the fixed sleeve 8 and the outer peripheral surface of the guide sleeve 5, the guide sleeve 5 is sleeved with a pushing sleeve 9 in a sliding manner, the inner end of the pushing sleeve 9 is positioned in the yielding cavity 22, the outer peripheral surface of the inner end of the pushing sleeve 9 is provided with an abutting part 91, the outer end extends out from the space between the inner peripheral surface of the limiting flange 81 and the outer peripheral surface of the guide sleeve 5, the yielding cavity 22 is internally provided with a spring 7 sleeved on the guide sleeve 5, one end of the spring 7 abuts against the fixed flange 53 of the guide sleeve 5, the other end abuts against the inner end surface of the pushing sleeve 9, under the action of the spring 7, when the movable die 2 and the fixed die 1 are in a die clamping state, the outer end of the pushing sleeve 9 abuts against the end surface of the positioning sleeve 4, when the movable die 2 and the fixed die 1 are separated, the outer end of the pushing sleeve 9 extends out of the mounting hole 21, and the abutting part 91 abuts against the limiting flange 81. The movable mould 2 is fixed with spacing bolt 23 perpendicularly on the side towards division baffle 3, has seted up spacing hole 32 on division baffle 3, and spacing bolt 23 peg graft in spacing hole 32, has spacing portion 321 in spacing hole 32's drill way border circumference, and spacing bolt 23's head can support and lean on spacing portion 321 when division baffle 3 is in the parting state.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.

Although terms of the fixed mold 1, the fixed hole 11, the movable mold 2, and the like are used more herein, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the utility model; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present utility model.

Claims (10)

1. The utility model provides an injection mold, includes cover half (1), movable mould (2) and is located opening gear (3) in the movable mould (2) outside, a serial communication port, be fixed with spacer sleeve (4) on cover half (1), guide pin bushing (5) in can axial insertion spacer sleeve (4) when being fixed with the compound die on movable mould (2), set up constant head tank (41) on spacer sleeve (4) inner peripheral face, be equipped with locating piece (6) that can radially stretch out and draw back on guide pin bushing (5), be fixed with guide arm (31) on opening gear (3) perpendicularly, this guide arm (31) slip grafting is in guide pin bushing (5), and guide arm (31) can compress tightly locating piece (6) in constant head tank (41) when fixed mould (1) and movable mould (2) are in the compound die state for guide pin bushing (5) and spacer sleeve (4) form axial positioning, when opening gear (3) are kept away from movable mould (2) guide arm and are moved to parting state (31) can release or break away from locating piece (6).

2. The injection mold according to claim 1, wherein the outer peripheral surface of the guide rod (31) is in sliding fit with the inner peripheral surface of the guide sleeve (5), a yielding groove (311) is circumferentially formed in the outer peripheral surface of the guide rod (31), and the yielding groove (311) of the guide rod (31) is opposite to the inner end of the positioning block (6) when the gear opening plate (3) moves away from the movable mold (2) to the parting state.

3. The injection mold according to claim 2, wherein the guide sleeve (5) is provided with a plurality of sliding holes (51) distributed along the circumferential direction in a penetrating manner, the sliding holes (51) are internally provided with the positioning blocks (6) in a sliding manner, the radial width of the positioning blocks (6) along the guide sleeve (5) is larger than the wall thickness of the guide sleeve (5), and when the movable mold (2) and the fixed mold (1) are in a mold closing state, the outer circumferential surface of the guide rod (31) can be tightly pressed on the inner end surface of the positioning blocks (6), so that the outer ends of the positioning blocks (6) are tightly pressed in the positioning grooves (41).

4. An injection mould according to claim 3, wherein 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 circumferentially arranged along the positioning sleeve (4), the two groove walls of the positioning groove (41) are conical surfaces, the groove width of the positioning groove (41) is gradually increased from inside to outside, and the outer guide surface (61) is pressed on the groove wall of the positioning groove (41) when the positioning block (6) is embedded into the positioning groove (41) under the action of the guide rod (31).

5. The injection mold according to claim 4, wherein the movable mold (2) is further provided with a spring (7), the spring (7) is sleeved on the guide sleeve (5), and when the movable mold (2) and the fixed mold (1) are in a mold closing state, the spring (7) is compressed and generates axial thrust to the positioning sleeve (4).

6. The injection mold according to any one of claims 2 to 5, wherein the inner end surface of the positioning block (6) is a matching cambered surface (63) adapted to the outer circumferential surface of the guide rod (31), two long edges of the matching cambered surface (63) are both chamfered to form an inner guide surface (62), two groove walls of the relief groove (311) are conical surfaces, the groove width of the relief groove (311) gradually increases from inside to outside, and when the positioning block (6) is embedded into the relief groove (311) under the action of the positioning sleeve (4), the inner guide surface (62) is pressed on the groove wall of the relief groove (311).

7. The injection mold according to any one of claims 2 to 5, wherein a bar-shaped limit groove (64) is formed in the side surface of the positioning block (6) along the radial direction of the guide sleeve (5), limit pins (52) are fixed on the side portions of the sliding holes (51) of the guide sleeve (5), the limit pins (52) are axially arranged along the guide sleeve (5), and one end of each limit pin (52) is inserted into the limit groove (64).

8. The injection mold according to claim 5, wherein the movable mold (2) is provided with a mounting hole (21), one end of the guide sleeve (5) facing the opening baffle plate (3) is inserted into the mounting hole (21), one end of the guide sleeve (5) inserted into the mounting hole (21) is circumferentially provided with an annular fixing flange (53), the mounting hole (21) is internally provided with a fixing sleeve (8), the inner end of the fixing sleeve (8) is pressed on the fixing flange (53), a yielding cavity (22) is formed between the inner peripheral surface of the fixing sleeve (8) and the outer peripheral surface of the guide sleeve (5), and the spring (7) is arranged in the yielding cavity (22).

9. The injection mold according to claim 8, wherein the guide sleeve (5) is provided with a pushing sleeve (9) in a sliding manner, one end of the pushing sleeve (9) is located in the abdication cavity (22), one end of the spring (7) is propped against the fixed protruding edge (53) of the guide sleeve (5), the other end of the spring is propped against the inner end surface of the pushing sleeve (9), and the outer end of the pushing sleeve (9) is propped against the end surface of the positioning sleeve (4) under the action of the spring (7) when the movable mold (2) and the fixed mold (1) are in a mold closing state.

10. The injection mold according to any one of claims 1 to 5, wherein a limit bolt (23) is vertically fixed on a side surface of the movable mold (2) facing the baffle plate (3), a limit hole (32) is formed in the baffle plate (3), the limit bolt (23) is inserted into the limit hole (32), a limit portion (321) is circumferentially arranged at an orifice edge of the limit hole (32), and a head portion of the limit bolt (23) can be abutted against the limit portion (321) when the baffle plate (3) is in a parting state.