CN220946494U

CN220946494U - Ejection structure of die

Info

Publication number: CN220946494U
Application number: CN202320415283.0U
Authority: CN
Inventors: 李金国; 虞伟炳; 傅建华; 郭国俊; 应建华; 陈剑富; 张旭
Original assignee: Zhejiang Saihao Industrial Co ltd; Taizhou Vocational and Technical College
Current assignee: Zhejiang Saihao Industrial Co ltd; Taizhou Vocational and Technical College
Priority date: 2023-03-03
Filing date: 2023-03-03
Publication date: 2024-05-14
Anticipated expiration: 2033-03-03

Abstract

The utility model provides an ejection structure of a mold, and belongs to the technical field of injection molds. The problem that the ejection structure of the existing die is low in reliability of secondary ordered ejection of products is solved. The ejection structure of the die comprises a movable die frame and a bottom plate, wherein the ejection structure comprises two top plates, a positioning sleeve is fixed on one top plate, a guide sleeve is fixed on the other top plate, 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 fixed on the bottom plate or the movable die frame, the guide sleeve is slidably sleeved on the guide rod, the positioning block is pressed in the positioning groove under the top pressure of the outer peripheral surface of the guide rod to form axial positioning, and a yielding groove capable of releasing the positioning block when the top plate close to the bottom plate is propped against the movable die frame to limit is formed in the outer peripheral surface of the guide rod. The ejection structure of the die can enable the secondary ordered ejection of the product to be more stable and reliable.

Description

Ejection structure of die

Technical Field

The utility model belongs to the technical field of injection molds, and relates to an ejection structure of a 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 in 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 through a screw rod is injected into a cavity by high pressure, after cooling and solidification, a molded product is obtained, after the product is molded, demolding is needed, generally, after a movable mold is opened, an injection molding machine drives a top plate to move, and the top plate ejects the product through a top rod. For products with complex shapes, a plurality of ejector rods are usually required to eject, wherein if an ejector block is fixed on each ejector rod, the ejector block is further provided with a matching surface matched with the concave-convex shape of the product, then secondary ejection is required, for example, the ejector rod of the ejector block and other ejector rods synchronously perform primary ejection to separate the product from the cavity surface, then the ejector rod is fixed to ensure that the ejector block is motionless, and other ejector rods further perform secondary ejection to separate the product from the matching surface of the ejector block.

As disclosed in patent document (application number: 200920135023.8), a simple secondary ejection mechanism of an injection mold comprises a thimble panel and a thimble bottom plate arranged below the thimble panel, wherein a plurality of thimbles are arranged on the thimble panel in a back way, a plurality of supporting thimbles are arranged on the thimble bottom plate, a limiting groove is formed in the supporting thimbles, a limiting buckle which can be correspondingly clamped in the limiting groove is arranged in a groove below the thimble bottom plate, the limiting buckle is connected with the thimble bottom plate through an elastic piece, so that the limiting buckle is positioned in the limiting groove of the supporting thimbles, when a product is ejected, the thimble panel and the thimble bottom plate are pushed to move forwards together by a thimble rod of the injection molding machine, the product is ejected together with the supporting thimbles, one ejection is realized, when the supporting thimbles move to the lower surface of a rear template to abut against the limit, the supporting thimbles stop moving forwards, and the limiting buckle compresses the elastic piece to separate from the limiting groove, so that the thimble panel and the thimble bottom plate continue to push the product forwards, and the secondary ejection is realized. But the support thimble of this structure is fixed a position through spacing buckle, and when there is the support thimble to receive great resistance in the ejecting in-process of once, if hold in the palm thimble jamming etc. also can lead to spacing buckle compression spring and break away from spacing recess, this will lead to once ejecting stroke not to walk, has the support thimble just to separate with the product, and the second order ejecting stability and the reliability of thimble are lower promptly, appear the phenomenon of strain product easily.

Disclosure of Invention

The utility model aims at solving the problems in the prior art, and provides an ejection structure of a die, which can enable secondary ordered ejection of products to be more stable and reliable.

The aim of the utility model can be achieved by the following technical scheme: the utility model provides an ejecting structure of mould, mould includes movable mould frame and the bottom plate that links firmly, ejecting structure is fixed with the spacer sleeve including sliding two roof that set up between movable mould frame and bottom plate on one of them roof, is fixed with the guide pin bushing of grafting in the spacer sleeve along the axial slip on another roof, set up the constant head tank on the spacer sleeve inner peripheral face, be equipped with the locating piece that can radially stretch out and draw back on the guide pin bushing, be fixed with the guide arm on bottom plate or the movable mould frame, above-mentioned guide pin bushing slip cap is established on the guide arm, and presses the locating piece to compress tightly in the constant head tank at the top of guide arm outer peripheral face and form axial positioning, still set up on the guide arm outer peripheral face and can release the groove of stepping down of locating piece when the roof that is close to the bottom plate and movable mould frame support to lean on spacing.

The die also comprises a fixed die frame and a fixed die core fixed on the fixed die frame, wherein a movable die core is fixed on the movable die frame, a cavity is formed when the fixed die core and the movable die core are matched, and the top plate is arranged on the movable die frame in a sliding manner and can move along with the movable die frame to realize die opening and die closing. The ejector rods are fixed on the two top plates, when the movable die frame is in a die opening state, the top plates move relative to the movable die frame, so that the ejector rods eject products, and particularly, the injection molding machine is connected with the top plate close to the movable die frame, the top plates can be driven to move towards the movable die frame, the outer peripheral surfaces of the guide rods are abutted against the inner ends of the positioning blocks, the outer ends of the positioning blocks are tightly pressed and positioned in the positioning grooves of the positioning sleeves, the guide sleeves and the positioning sleeves form axial positioning, and therefore the top plate close to the movable die frame moves synchronously with the other top plate, so that the ejector rods on the two top plates eject products synchronously, and one ejection is realized. When the top plate close to the bottom plate and the movable mold frame form the propping limit, the one-time ejection stroke is ended, the yielding groove is just opposite to the inner end of the positioning block, namely, the positioning block is separated from the outer circumferential surface of the ejector rod, the positioning block can radially move inwards when the top plate close to the movable mold frame has a further movement trend, the inner end is embedded into the yielding groove, the outer end is separated from the positioning groove, the positioning sleeve and the guide sleeve lose axial positioning, the two top plates are separated, namely, the top plate close to the bottom plate stops moving, the top plate close to the movable mold frame continues to move, the ejector rod on the top plate further ejects a product, and the secondary ejection is realized. Because the positioning block is propped in the positioning groove through the peripheral surface of the guide rod in the primary ejection process, the positioning sleeve and the guide sleeve are axially positioned all the time before the primary stroke moves in place, the phenomenon that one ejector rod cannot be ejected in place due to the separation of two top plates in the primary ejection process is avoided, and the secondary ordered ejection of the product is more stable and reliable.

In the ejection structure of the die, the top plate close to the bottom plate is a primary top plate, the top plate close to the movable die frame is a secondary top plate, the positioning sleeve is fixed on the secondary top plate, the guide sleeve is fixed on the primary top plate, and one end of the guide sleeve, facing the movable die frame, of the guide sleeve penetrates through the positioning sleeve. The guide sleeve is in sliding fit with the guide rod, the positioning sleeve is in sliding fit with the guide sleeve, accurate guiding is achieved, ejection position accuracy is improved, the secondary top plate further moves after the primary top plate stroke is in place, and secondary ejection stroke is achieved.

In the ejection structure of the die, the guide sleeve is provided with a plurality of sliding holes in a penetrating mode, the sliding holes are circumferentially distributed, the positioning blocks are slidably arranged in the sliding holes, the radial width of each positioning block along the guide sleeve is larger than the wall thickness of the guide sleeve, and when the outer peripheral surface of the guide rod abuts against the inner end surface of each positioning block, the outer ends of the positioning blocks are pressed in the positioning grooves. The sliding block moves radially, or the outer end is embedded into the positioning groove, or the inner end is embedded into the yielding groove, so that the structure is stable and reliable.

In the ejection structure of the die, 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 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 ejection structure of the die, a spring is further arranged between the primary top plate and the secondary top plate, and is in a compressed state and generates thrust along the axial direction of the guide rod for the secondary top plate when the positioning block is pressed and positioned in the positioning groove. When the primary top plate and the movable die frame are propped against and limited, 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 secondary top plate can assist in pushing the secondary top plate, and the positioning sleeve pushes the outer guide surface of the positioning block through the groove wall of the positioning groove, so that the positioning block is separated from the positioning groove, and the guide sleeve is in an unlocking state when the injection molding machine drives the secondary top plate, and the whole secondary ejection process is more reliable.

In the ejection structure of the die, the positioning block is arc-shaped along the circumferential direction of the guide sleeve, 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 are chamfered to form an inner guide surface, the yielding groove is annular and is circumferentially arranged along the guide rod, two groove walls of the yielding groove are conical surfaces, the groove width of the yielding groove is gradually increased from inside to outside, and the inner guide surface is pressed on the groove wall of the yielding groove when the positioning block is embedded into the yielding groove under the action of the inner circumferential surface of the positioning sleeve. 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 stability and reliability of axial positioning of the guide sleeve and the positioning sleeve are guaranteed, the positioning groove is opposite to the outer end of the positioning block when the secondary top plate is in reset movement and abutted against the primary top plate, the inner guide surface can act on the groove wall of the yielding groove when the primary top plate is in reset movement, and the groove wall of the yielding groove of the guide rod pushes the positioning block, so that the positioning block is embedded into the positioning groove.

In the ejection structure of the mold, a first limit post is vertically fixed on the primary top plate, a through hole is formed in the secondary top plate, the first limit post slides through the through hole and faces the movable mold frame, the distance between the end face of the first limit post and the side face of the movable mold frame is equal to the distance between the locating block and the abdication groove along the axial direction of the guide rod, and when the first limit post is propped against the movable mold frame, the locating block is opposite to the abdication groove. The primary top plate far away from the movable mold frame is opposite to the movable mold frame through the through hole of the secondary top plate through the first limiting column, so that the secondary top plate still has a moving space when the primary top plate and the movable mold frame are in abutting limiting.

In the ejection structure of the die, the primary top plate is provided with the fixing hole in a penetrating mode, the fixing sleeve is fixed in the fixing hole, the guide rod penetrates through the fixing sleeve, the end portion of the guide sleeve is inserted into the fixing sleeve, the outer peripheral surface of the guide sleeve is in threaded connection with the inner peripheral surface of the fixing sleeve, the fixing hole is provided with the mounting groove towards the periphery of the orifice edge of one end of the secondary top plate, the spring is sleeved on the guide sleeve and located in the mounting groove, and when the positioning block is pressed and positioned in the positioning groove, the spring is pressed between the bottom surface of the mounting groove and the side surface of the secondary top plate. The guide sleeve is in threaded connection with the fixed sleeve, so that the extending length of the guide sleeve can be adjusted, the positioning block is accurate and opposite to the yielding groove when the first limiting column is propped against the movable die frame, the reliability of axial positioning and unlocking of the guide sleeve and the positioning sleeve is guaranteed, and the spring is arranged in the mounting groove, so that the structure is more compact.

In the ejection structure of the die, the secondary top plate is penetrated and provided with the mounting hole, the hole wall of the mounting hole is circumferentially provided with the annular clamping groove, the outer circumferential surface of the positioning sleeve is circumferentially provided with the clamping convex edge, the positioning sleeve is arranged in the mounting hole, the clamping convex edge is clamped in the annular clamping groove, and the positioning groove and the clamping convex edge are oppositely arranged along the radial direction. The positioning sleeve is stable in structure, thicker in the clamping convex edge and used for forming the positioning groove, and higher in structural strength.

In the ejection structure of the die, the side surface of the secondary top plate, facing the movable die frame, is vertically fixed with a second limit column, and when the positioning block is pressed and positioned in the positioning groove, the length of the first limit column extending out of the side surface of the secondary top plate is greater than that of the second limit column. The first limit column is propped against the movable mold frame during ejection, primary ejection is achieved, and then the secondary top plate continues to move until the second limit column is propped against the movable mold frame, and secondary ejection is achieved.

Compared with the prior art, the ejection structure of the die has the following advantages:

1. Because the positioning block is propped in the positioning groove through the peripheral surface of the guide rod in the primary ejection process, the positioning sleeve and the guide sleeve are axially positioned all the time before the primary stroke moves in place, the phenomenon that one ejector rod cannot be ejected in place due to the separation of two top plates in the primary ejection process is avoided, and the secondary ordered ejection of the product is more stable and reliable.

2. Due to the fact that the spring is further arranged, when the primary top plate and the movable die frame are propped against and limited, 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 secondary top plate can assist in pushing the secondary top plate, the positioning sleeve pushes the outer guide surface of the positioning block through the groove wall of the positioning groove, the positioning block is separated from the positioning groove, the guide sleeve is in an unlocking state when the injection molding machine drives the secondary top plate, and the whole secondary ejection process is more reliable.

Drawings

Fig. 1 is a partial structural cross-sectional view of an ejection structure of a mold.

Fig. 2 is an enlarged view of the structure at a in fig. 1.

Fig. 3 is an enlarged view of the structure at B in fig. 1.

Fig. 4 is a partial structural cross-sectional view of the positioning block of fig. 1.

Fig. 5 is an enlarged view of the structure at C in fig. 1.

Fig. 6 is a schematic diagram of the ejection structure of the mold at the time of one ejection.

Fig. 7 is a schematic diagram of the ejection structure of the mold at the time of secondary ejection.

In the figure, 1, a movable mold frame; 11. an ejection hole; 2. a bottom plate; 21. a guide rod; 211. a relief groove; 22. a through hole; 3. a top plate; 31. a primary top plate; 311. a first limit post; 312. a primary ejector rod; 313. a fixing hole; 314. a mounting groove; 32. a secondary top plate; 321. the second limit column; 322. a secondary ejector rod; 323. a through hole; 324. a mounting hole; 325. an annular clamping groove; 326. a driving rod; 4. a positioning sleeve; 41. a positioning groove; 42. clamping the convex edge; 5. guide sleeve; 51. a slide hole; 6. a positioning block; 61. an outer guide surface; 62. matching with the cambered surface; 63. an inner guide surface; 7. a spring; 8. a fixed sleeve; 9. square iron.

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. 1, an ejection structure of a mold includes a movable mold frame 1 and a bottom plate 2, the movable mold frame 1 and the bottom plate 2 are fixedly connected by a square iron 9, so that a space is formed between the movable mold frame 1 and the bottom plate 2, the ejection structure includes two top plates 3, the two top plates 3 are a primary top plate 31 and a secondary top plate 32, the primary top plate 31 and the secondary top plate 32 are both slidably arranged between the movable mold frame 1 and the bottom plate 2, the sliding direction of the primary top plate 31 and the secondary top plate 32 is consistent with the mold opening direction of the movable mold frame 1, the primary top plate 31 is close to the bottom plate 2, the secondary top plate 32 is close to the movable mold frame 1, a driving rod 326 is vertically fixed on the secondary top plate 32, a through hole 22 is formed on the bottom plate 2, and the driving rod 326 passes through the through hole 22 and is used for connecting an injection molding machine. A primary ejector rod 312 is vertically fixed on the primary top plate 31, a secondary ejector rod 322 is vertically fixed on the secondary top plate 32, two ejection holes 11 are formed in the movable die frame 1 in a penetrating mode, avoiding holes are formed in the secondary top plate 32 in a penetrating mode, the primary ejector rod 312 penetrates through the avoiding holes and is inserted into one ejection hole 11, and the secondary ejector rod 322 is directly inserted into the other ejection hole 11. The first limiting post 311 is vertically fixed on the primary top plate 31, the through hole 323 is formed in the secondary top plate 32, the first limiting post 311 slides through the through hole 323 and faces the movable die frame 1, the second limiting post 321 is vertically fixed on the side face of the secondary top plate 32, facing the movable die frame 1, of the secondary top plate 32, and when the primary top plate 31 abuts against the secondary top plate 32, the length of the first limiting post 311 extending out of the side face of the secondary top plate 32 is larger than that of the second limiting post 321.

As shown in fig. 2 and 3, the guide sleeve 5 is fixed on the primary top plate 31, the positioning sleeve 4 is fixed on the secondary top plate 32, the guide sleeve 5 extends out of the side surface of the primary top plate 31 and is slidably inserted into the positioning sleeve 4, the positioning sleeve 4 is provided with a positioning groove 41 on the inner circumferential surface, the guide sleeve 5 is provided with a positioning block 6 capable of radially stretching, a guide rod 21 is fixed between the bottom plate 2 and the movable mold frame 1, the guide rod 21 is arranged along the mold opening direction, the guide sleeve 5 is slidably sleeved on the guide rod 21, when the primary ejector rod 312 and the secondary ejector rod 322 are not ejected, the outer circumferential surface of the guide rod 21 is also provided with a yielding groove 211, and when the first limiting column 311 abuts against the movable mold frame 1 to limit, the yielding groove 211 is opposite to the inner end of the positioning block 6. Therefore, when the product is injection molded, the primary ejector rod 312 and the secondary ejector rod 322 are not ejected, at this time, the outer peripheral surface of the guide rod 21 abuts against the inner end of the positioning block 6, so that the outer end of the positioning block 6 is pressed in the positioning groove 41, the positioning sleeve 4 and the guide sleeve 5 form axial positioning, and the distance between the end surface of the first limiting column 311 and the side surface of the movable mold frame 1 is equal to the distance between the positioning block 6 and the yielding groove 211 along the axial direction of the guide rod 21. Referring to fig. 6, the injection molding machine drives the secondary top plate 32 to move towards the movable mold frame 1, the positioning sleeve 4 drives the guide sleeve 5 through the positioning block 6, and further drives the primary top plate 31 to move until the first limiting post 311 abuts against the movable mold frame 1, so as to realize primary ejection of the primary ejector rod 312, and at this time, the inner end of the positioning block 6 is opposite to the abdicating groove 211 on the guide rod 21. With reference to fig. 7, the injection molding machine continues to drive the secondary top plate 32, the positioning sleeve 4 pushes the positioning block 6, so that the inner end of the positioning block 6 is embedded into the yielding groove 211, the outer end of the positioning block 6 is separated from the positioning groove 41, that is, the positioning sleeve 4 and the guide sleeve 5 lose axial positioning, and the secondary top plate 32 can continue to move until the second limiting post 321 abuts against the movable mold frame 1, so that secondary ejection of the secondary ejector rod 322 is realized.

Specifically, as shown in fig. 4, four sliding holes 51 are formed in the guide sleeve 5 in a penetrating manner, the four sliding holes 51 are circumferentially distributed, positioning blocks 6 are slidably arranged in the sliding holes 51, 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 two long edges of the outer end face of the positioning block 6 are both formed into an outer guide surface 61 through chamfering, the positioning groove 41 is annular and is arranged along the circumferential direction of 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, the positioning block 6 is arc-shaped and strip-shaped along the circumferential direction of the guide sleeve 5, the inner end face of the positioning block 6 is a matched cambered surface 62, the matched cambered surface 62 is matched with the outer circumferential surface of the guide rod 21, the two long edges of the matched cambered surface 62 are both formed into an inner guide surface 63 through chamfering, the yielding groove 211 is annular and is arranged along the circumferential direction of the guide rod 21, the two groove walls of the yielding groove 211 are conical surfaces, the groove width of the yielding groove 211 is gradually increased from inside to outside, when the outer circumferential surface of the guide rod 21 abuts against the matched cambered surface 62 of the positioning block 6, the outer end of the positioning block 6 is embedded into the positioning groove 41, the outer guide surface 61 is tightly pressed on the groove wall of the positioning groove 41, and when the outer end of the positioning block 6 is tightly pressed on the groove wall of the yielding groove 211 under the effect of the inner circumferential surface of the positioning sleeve 4.

Referring to fig. 5, a fixing hole 313 is formed in the primary top plate 31, a fixing sleeve 8 is fixed in the fixing hole 313, a guide rod 21 passes through the fixing sleeve 8, the end portion of the guide sleeve 5 is inserted into the fixing sleeve 8, the outer peripheral surface of the guide sleeve 5 is in threaded connection with the inner peripheral surface of the fixing sleeve 8, a mounting groove 314 is formed in the periphery of the opening edge of one end of the fixing hole 313, which faces the secondary top plate 32, of the fixing hole 313, a spring 7 is arranged in the mounting groove 314, the spring 7 is sleeved on the guide sleeve 5, and when the positioning block 6 is pressed and positioned in the positioning groove 41, the spring 7 is pressed between the bottom surface of the mounting groove 314 and the side surface of the secondary top plate 32 and generates thrust along the axial direction of the guide rod 21 to the secondary top plate 32. The secondary roof 32 is penetrated and provided with a mounting hole 324, the hole wall of the mounting hole 324 is circumferentially provided with an annular clamping groove 325, the outer circumferential surface of the positioning sleeve 4 is circumferentially provided with a clamping convex edge 42, the positioning sleeve 4 is arranged in the mounting hole 324, the clamping convex edge 42 is clamped in the annular clamping groove 325, and the positioning groove 41 and the clamping convex edge 42 are oppositely arranged along the radial direction.

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 such as the movable mold frame 1, the ejection hole 11, the base plate 2, etc. 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

1. The utility model provides an ejecting structure of mould, mould includes movable mould frame (1) and bottom plate (2) that link firmly, ejecting structure is including sliding two roof (3) that set up between movable mould frame (1) and bottom plate (2), and its characterized in that is fixed with spacer sleeve (4) on one roof (3), is fixed with guide pin bushing (5) of grafting in spacer sleeve (4) along the axial slip on another roof (3), 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 (21) on bottom plate (2) or movable mould frame (1), above-mentioned guide pin bushing (5) slip cap is established on guide arm (21), and compress tightly in spacer sleeve (41) under the top of guide arm (21) outer peripheral face and form axial location, still set up on the outer peripheral face of guide arm (21) roof (3) and movable mould frame (1) when being close to bottom plate (2) support and stop can release (6) when stepping down spacing.

2. The ejection structure of a mold according to claim 1, wherein the top plate (3) close to the bottom plate (2) is a primary top plate (31), the top plate (3) close to the movable mold frame (1) is a secondary top plate (32), the positioning sleeve (4) is fixed on the secondary top plate (32), the guide sleeve (5) is fixed on the primary top plate (31), and one end of the guide sleeve (5) facing the movable mold frame (1) passes through the positioning sleeve (4).

3. The ejection structure of a mold according to claim 2, wherein a plurality of sliding holes (51) are formed in the guide sleeve (5) in a penetrating manner, the sliding holes (51) are circumferentially distributed, the positioning blocks (6) are slidably arranged in the sliding holes (51), the radial width of each positioning block (6) along the guide sleeve (5) is larger than the wall thickness of the guide sleeve (5), and when the outer peripheral surface of the guide rod (21) abuts against the inner end surface of each positioning block (6), the outer ends of the positioning blocks (6) are pressed in the positioning grooves (41).

4. A die ejection structure according to claim 2 or 3, wherein, two long edges of the outer end surface of the positioning block (6) are chamfered to form an outer guiding surface (61), the positioning groove (41) is annular and 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) is gradually increased from inside to outside, and when the positioning block (6) is embedded into the positioning groove (41) under the action of the guide rod (21), the outer guiding surface (61) is pressed on the groove wall of the positioning groove (41).

5. The ejection structure of the mold according to claim 4, wherein a spring (7) is further provided between the primary top plate (31) and the secondary top plate (32), and the spring (7) is in a compressed state and generates a thrust force along the axial direction of the guide rod (21) on the secondary top plate (32) when the positioning block (6) is pressed and positioned in the positioning groove (41).

6. A die ejection structure according to claim 2 or 3, wherein the positioning block (6) is arc-shaped along the circumferential direction of the guide sleeve (5), the inner end surface of the positioning block (6) is a matched cambered surface (62) which is matched with the outer circumferential surface of the guide rod (21), two long edges of the matched cambered surface (62) are both formed into an inner guide surface (63) through chamfering, the yielding groove (211) is annular and is circumferentially arranged along the guide rod (21), two groove walls of the yielding groove (211) are conical surfaces, the groove width of the yielding groove (211) is gradually increased from inside to outside, and when the positioning block (6) is embedded into the yielding groove (211) under the action of the inner circumferential surface of the positioning sleeve (4), the inner guide surface (63) is pressed on the groove wall of the yielding groove (211).

7. A die ejection structure according to claim 2 or 3, wherein a first limit post (311) is vertically fixed on the primary top plate (31), a through hole (323) is formed in the secondary top plate (32), the first limit post (311) slides through the through hole (323) and faces the movable die frame (1), a distance between an end face of the first limit post (311) and a side face of the movable die frame (1) is equal to a distance between the locating block (6) and the abdication groove (211) along an axial direction of the guide rod (21), and the locating block (6) is opposite to the abdication groove (211) when the first limit post (311) abuts against the movable die frame (1).

8. The ejection structure of a mold according to claim 5, wherein a fixing hole (313) is formed in the primary top plate (31) in a penetrating manner, a fixing sleeve (8) is fixed in the fixing hole (313), the guide rod (21) penetrates through the fixing sleeve (8), the end portion of the guide sleeve (5) is inserted into the fixing sleeve (8), the outer peripheral surface of the guide sleeve (5) is in threaded connection with the inner peripheral surface of the fixing sleeve (8), a mounting groove (314) is formed in the circumferential direction of the edge of one end hole opening of the fixing hole (313) towards the secondary top plate (32), the spring (7) is sleeved on the guide sleeve (5) and is located in the mounting groove (314), and when the positioning block (6) is pressed and positioned in the positioning groove (41), the spring (7) is pressed between the bottom surface of the mounting groove (314) and the side surface of the secondary top plate (32).

9. The ejection structure of the mold according to claim 8, wherein a mounting hole (324) is formed in the secondary top plate (32) in a penetrating manner, an annular clamping groove (325) is formed in the hole wall of the mounting hole (324) in the circumferential direction, a clamping convex edge (42) is formed in the circumferential direction of the outer circumferential surface of the positioning sleeve (4), the positioning sleeve (4) is arranged in the mounting hole (324), the clamping convex edge (42) is clamped in the annular clamping groove (325), and the positioning groove (41) and the clamping convex edge (42) are arranged radially opposite to each other.

10. The ejection structure of the mold according to claim 7, wherein a second limit post (321) is vertically fixed on a side surface of the secondary top plate (32) facing the movable mold frame (1), and a length of the first limit post (311) extending out of the side surface of the secondary top plate (32) is greater than a length of the second limit post (321) when the positioning block (6) is pressed and positioned in the positioning groove (41).