A cushioning structure of a mold

Abstract

The present invention provides a buffer structure of a mold, which belongs to the field of mold technology. It solves the problem that the buffer effect of the existing buffer block is poor when the ejector plate is reset. The buffer structure of the mold includes a base plate and an ejector plate that are relatively arranged. The buffer structure includes a positioning column fixedly connected to the base plate, and a buffer sleeve made of elastic material and arranged toward the ejector plate is slidably connected to the positioning column. The upper end of the positioning column has a limiting portion that abuts against the upper end of the buffer sleeve. The upper end of the positioning column is circumferentially positioned with the upper end of the buffer sleeve. The lower end of the positioning column has two supporting blades protruding radially outward. Two arc-shaped oil grooves are provided on the inner side wall of the buffer sleeve. The supporting blades are radially embedded in the corresponding oil grooves and divide the corresponding oil grooves into two oil storage chambers. An oil flow channel connecting the two oil grooves is provided in the buffer sleeve. The overall reliability of the buffer structure of the mold is higher, which improves the buffering effect of the buffer structure.

Description

Technical Field

[0001] The invention belongs to the technical field of molds and relates to a buffer structure of a mold. Background Art

[0002] Injection molds are commonly used equipment for producing plastic products. According to the analysis of product appearance and structure, when opening the mold, a straight ejector block, an inclined ejector block and other mechanisms are usually set on the mold. When the product is formed and the mold is opened, the injection molding machine pushes the ejector plate to compress the spring and move it toward the movable mold. The ejector pin on the ejector plate ejects the product, realizing the demoulding of the product. After the demoulding is completed, the injection molding machine is released, so that the ejector plate can be quickly reset and pressed against the bottom plate under the reset force of the spring. Since the distance between the ejector plate and the bottom plate is large, a buffer block is usually set on the bottom plate to reduce the impact force of the ejector plate on the bottom plate.

[0003] For example, Chinese patent application [Authorization Announcement No.: CN210026155U] discloses a reset buffer mechanism for an injection mold ejector plate, including an upper and lower mold plate, a cavity plate is installed under the upper plate, two mold feet are installed on the lower plate, a core plate is installed on the two mold feet, the core plate cooperates with the cavity plate, an ejector bottom plate and an ejector panel are arranged between the two mold feet, a reset rod is connected to the ejector panel, the reset rod passes through the core plate, a gasket is arranged on the cavity plate corresponding to the reset rod, when the mold is closed, the gasket contacts the reset rod, a buffer pad is arranged on the lower reset plate, the buffer pad is fixed by a plug screw, a gap is arranged between the plug screw and the buffer pad, and the buffer pad is made of polyurethane material.

[0004] The above-mentioned buffer pad can play a certain buffering effect, but the buffering effect produced by the buffer pad relying on its own material characteristics is limited. The ejector plate directly impacts the buffer pad for a long time, which makes the buffer pad easy to age after long-term use, affecting the buffering effect after continuous use. Since the distance between the ejector plate and the bottom plate is large, the impact force is large when the ejector plate is reset. During long-term use, the buffer pad is easily damaged, thereby reducing the service life of the buffer pad. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems in the prior art and propose a mold buffer structure. The technical problem to be solved by the present invention is: how to solve the problem of poor buffering effect of the buffer block when the ejector plate is reset.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] The cam is an axially-inclined part of the casing, and the cam is configured to move the cam in a direction of rotation with respect to the bottom plate of the casing, wherein the cam is secured to the bottom plate with respect to the bottom plate and is slidably connected to the cam. The cam is configured to move the cam in a direction of rotation with respect to the bottom plate, wherein the cam is secured to the bottom plate with respect to the bottom plate and is slidably connected to the cam. The cam is configured to move the cam in a direction of rotation with respect to the bottom plate, wherein the cam is secured to the bottom plate with respect to the bottom plate and is slidably connected to the cam. The cam is configured to move the cam in a direction of rotation with respect to the bottom plate, wherein the cam is secured to the bottom plate with respect to the bottom plate

[0008] Working principle: A number of ejectors are vertically fixed on the side surface of the ejector plate, which are used to eject the product when the ejector plate rises. The positioning column is fixed on the upper end surface of the bottom plate. A buffer sleeve is slidably connected to the positioning column. The buffer sleeve is made of elastic material. The upper end of the buffer sleeve is vertically limited by the limiting portion of the positioning column. When the ejector plate hits the buffer sleeve, the lower end surface of the ejector plate first abuts against the upper end surface of the buffer sleeve, and the buffer sleeve slides downward along the positioning column. The upper end of the buffer sleeve is circumferentially positioned with the positioning column without circumferential torsion. The lower end of the buffer sleeve is attached to the guide wall one through the guide wall two, and the guide wall two slides along the guide wall one. The guide wall one is arranged to be inclined downward along the axial direction, and the lower end of the buffer sleeve moves along the moving direction of the guide wall two. Circumferential twisting occurs, and the supporting blades move relative to the oil groove. The relative movement of the supporting blades changes the internal space of the two oil storage chambers, so that the internal space of one of the oil storage chambers becomes smaller, while the internal space of the other becomes larger. The grease in the oil groove passes through the gap between the supporting blades and the oil groove from the oil storage chamber with a reduced internal space and enters the other oil storage chamber with an enlarged internal space. The flow of grease can produce greater damping, which, combined with the elastic force of the buffer sleeve itself, has a buffering effect on the descent of the buffer sleeve, so that the buffer sleeve can buffer the resetting of the ejector plate, avoid noise and vibration caused by direct hard impact, improve the stability of other components on the mold, and have higher overall reliability, thereby improving the buffering effect of the buffer structure.

[0009] The above structure utilizes the cooperation of guide wall one and guide wall two and the elasticity of the buffer sleeve itself to convert the downward movement of the buffer sleeve into circumferential torsion, and the circumferential torsion force enables the supporting blades to move relatively in the oil groove, thereby achieving the purpose of changing the internal space of the two oil storage chambers. The grease inside the oil storage chamber is squeezed and flows as the size of the internal space changes, and damping is generated to enhance the buffering effect of the buffer sleeve. When resetting, the buffer sleeve gradually twists in the opposite direction by relying on its own elastic force, and the internal space of the oil storage chamber returns to its initial state as the twisting occurs. The grease also returns from the gap between the supporting blade and the oil groove and the oil flow channel to the corresponding oil storage chamber with an enlarged space, thereby enhancing the resetting efficiency of the grease in the buffer sleeve.

[0010] In the above-mentioned mold buffer structure, the outer side surface of the support blade is arc-shaped, and the outer side surface of the support blade is in contact with the groove wall of the oil groove and can slide relative to the groove wall of the oil groove, and the end surfaces of the upper and lower ends of the support blade are in contact with the groove wall of the oil groove.

[0011] The outer side surface and the upper and lower end surfaces of the supporting blade fit with the groove wall of the oil groove, so that the gap between the supporting blade and the oil groove is smaller, and the grease flows from the smaller gap, resulting in a better damping effect. The outer side surface is arc-shaped, which facilitates relative movement with the supporting blade and reduces the gap between the outer side surface and the oil groove, so that the grease flows more slowly, thereby improving the buffering effect of the buffer structure.

[0012] In the above-mentioned mold buffer structure, there are two oil flow channels, which are symmetrically arranged along the axial direction of the positioning column. The oil flow channels are inclined along the axial direction of the buffer sleeve, and the inclination direction of the oil flow channels is the same as the inclination direction of the guide wall 2.

[0013] Two oil flow channels are provided to facilitate the rapid resetting of the grease in the oil grooves on both sides, and the setting of the oil flow channels in an inclined direction avoids the setting of the oil flow channels affecting the flow of grease when the buffer sleeve is twisted, thereby achieving the effect that the grease flows slowly during twisting and the grease can be quickly reset during resetting, thereby ensuring the buffering effect while improving the resetting efficiency.

[0014] In the buffer structure of the above-mentioned mold, the outer wall of the positioning column protrudes radially outward to form a guide strip 1, and the inner wall of the buffer sleeve is recessed radially outward to form an installation cavity. A guide strip 2 made of a hard material is fixedly connected to the installation cavity. The guide strip 1 is embedded in the installation cavity, and the end surface where the guide strip 1 fits with the guide strip 2 is the above-mentioned guide wall 1, and the end surface where the guide strip 2 fits with the guide strip 1 is the above-mentioned guide wall 2.

[0015] Guide bar 2 is made of hard material, so that guide bar 2 will not be deformed when sliding along guide bar 1, and the sliding friction is reduced, making the sliding more stable and smooth. In addition, through the setting of the installation cavity, the guide bar 1 can be further limited, thereby improving the sliding stability of guide bar 2.

[0016] In the above-mentioned buffer structure of the mold, the second guide strip and the supporting blade are staggered in the axial direction.

[0017] When the lower end of the buffer sleeve is twisted circumferentially, the supporting blades will move relative to the oil groove. In order to avoid interference between the guide strip 2 and the supporting blades, the distribution is more reasonable and the buffering of the buffer structure is more stable by staggering.

[0018] In the above-mentioned buffer structure of the mold, the positioning column includes a fixing rod fixed on the base plate and a fixing nut threadedly connected to the upper end of the fixing rod, the fixing nut is the above-mentioned limiting part, and a countersunk hole is opened on the upper end surface of the buffer sleeve, and the lower end surface of the fixing nut abuts against the bottom wall of the countersunk hole.

[0019] The setting of the fixing rod and the fixing nut allows the buffer sleeve to be more quickly and stably mounted on the positioning column, and the two simple components of the fixing rod and the fixing nut improve the convenience of installation and facilitate the processing of the fixing rod; the setting of the countersunk hole plays a role in giving way and installation, avoiding the direct contact between the ejector plate and the fixing rod, so that the setting of the fixing nut and the fixing rod does not affect the force and downward movement of the buffer sleeve.

[0020] In the above-mentioned buffer structure of the mold, the buffer sleeve includes a sleeve body sleeved on the positioning column and a mounting ring connected to the lower end of the sleeve body, the lower end of the sleeve body is provided with the above-mentioned oil groove, the mounting ring blocks the lower notch of the oil groove, and the mounting ring is provided with a sealing ring that abuts against the end face of the sleeve body.

[0021] The buffer sleeve adopts a split design, so that the supporting blades on the positioning column can be quickly embedded in the oil groove of the sleeve body when the buffer sleeve is installed, and the oil groove is shielded by the mounting ring, which is convenient for the processing and installation of the buffer sleeve, and the oil groove is sealed by the sealing ring.

[0022] In the above-mentioned mold buffer structure, the lower end of the mounting ring is connected to a plurality of elastic blocks, which are evenly distributed along the circumference of the mounting ring. The lower end of the elastic block abuts against the bottom plate, and there is an extrusion gap between the elastic block and the outer wall of the positioning column.

[0023] The setting of the elastic block enables the buffer sleeve to move downward quickly when it is pressed down by pressure. The elastic block is more easily squeezed and deformed, and the left and right sides of the elastic block can deform outward quickly. After compression, it can also push the sleeve body upward through its own elastic force, thereby improving the overall reset efficiency of the buffer sleeve.

[0024] In the above-mentioned mold buffer structure, a limit ring made of hard material is inlaid on the inner side wall of the upper end of the buffer sleeve, and an internal spline or an internal flat key is opened on the inner side wall of the limit ring. The limit ring is connected to the positioning column through a spline or a flat key.

[0025] The use of a flat key or a spline connection makes the connection between the limit ring and the positioning column simple and easy to operate. The setting of the limit ring made of hard material improves the circumferential positioning effect of the positioning column and the upper end of the buffer sleeve, avoids the upper end of the buffer sleeve from twisting during the downward pressing process of the ejector plate, and ensures the buffering effect of the upper end of the buffer sleeve.

[0026] In the above-mentioned buffer structure of the mold, the limiting ring and the second guide strip are arranged at intervals along the axial direction.

[0027] The arrangement of this structure ensures that the circumferential positioning of the upper end of the buffer sleeve and the circumferential torsion of the lower end do not affect each other, and the circumferential torsion of the lower end of the buffer sleeve is more stable.

[0028] Compared with the prior art, the buffer structure of this mold has the following advantages:

[0029] 1. The above structure utilizes the cooperation of guide wall 1 and guide wall 2 and the elasticity of the buffer sleeve itself to convert the downward movement of the buffer sleeve into circumferential torsion. The circumferential torsion force enables the supporting blades to move relatively in the oil groove, thereby achieving the purpose of changing the internal space of the two oil storage chambers. The grease inside the oil storage chamber is squeezed and flows with the change of the size of the internal space, and damping is generated, thereby improving the buffering effect of the buffer sleeve.

[0030] 2. Two oil flow channels are provided to facilitate the rapid resetting of the grease in the oil grooves on both sides. The inclined direction is set to avoid the setting of the oil flow channels affecting the flow of grease when the buffer sleeve is twisted, so that the grease flows slowly during twisting and can be quickly reset during resetting, thereby ensuring the buffering effect and improving the resetting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a cross-sectional view of the local structure of the mold in the open mold state.

[0032] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0033] Figure 3 This is a partial cross-sectional view of the cushioning structure of the mold when it is installed on the bottom plate and the mold is opened in another direction.

[0034] Figure 4 This is a partial exploded view of the buffer structure.

[0035] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle.

[0036] Figure 6 It is a cross-sectional view of the local structure of the mold in the mold closing state.

[0037] Figure 7 yes Figure 6 A partial enlarged view of point C in the middle.

[0038] Figure 8 It is a front view of the buffer structure.

[0039] Fig. 9 yes Figure 8 Sectional view of AA.

[0040] Fig.10 It is a structural schematic diagram of the buffer sleeve in this buffer structure.

[0041] In the figure, 1, fixed mold; 2, movable mold; 21, cavity; 3, bottom plate; 4, ejector plate; 41, ejector pin; 42, spring; 5, positioning column; 51, limit part; 52, fixing rod; 52a supporting blade; 53, guide wall 1; 54, guide strip 1; 6, buffer sleeve; 61, oil groove; 61a, oil storage cavity; 62, oil flow channel; 63, guide wall 2; 64, guide strip 2; 65, installation cavity; 66, countersunk hole; 67, sleeve body; 68, installation ring; 68a, elastic block; 69, limit ring; 69a, spline; 7, sealing ring; 8, extrusion gap. DETAILED DESCRIPTION

[0042] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0043] like Figure 1 and Figure 6 As shown, the buffer structure of the mold, the mold includes a fixed mold 1 and a movable mold 2, the movable mold 2 can be moved relative to the fixed mold 1 by the drive of the injection molding machine, and the two can form a cavity 21 when the molds are closed, and an ejector plate 4 and a bottom plate 3 are also provided on the side of the movable mold 2, the movable mold 2 is fixed on the bottom plate 3, and there is a space between the movable mold 2 and the bottom plate 3, the ejector plate 4 is arranged between the movable mold 2 and the bottom plate 3, and a plurality of ejector pins 41 are vertically fixed on the upper side surface of the ejector plate 4, the ejector pins 41 pass through the movable mold 2 and are opposite to the product in the cavity 21, and a spring 42 is also sleeved on the ejector pins 41, and the spring 42 acts between the movable mold 2 and the ejector plate 4, when the movable mold 2 is opened relative to the fixed mold 1 under the driving force of the injection molding machine, the injection molding machine can also push the ejector plate 4 to move relative to the movable mold 2, so that the ejector pin 41 ejects the product, and then the injection molding machine releases the ejector plate 4, and the ejector plate 4 is reset to the bottom plate 3 under the action of the spring 42.

[0044] Specifically, Figure 1-10 As shown, the buffer structure includes a positioning column 5 fixedly connected to the bottom plate 3, a buffer sleeve 6 made of elastic material and arranged toward the ejection plate 4 is slidably connected to the positioning column 5, a limiting portion 51 is provided on the upper end of the positioning column 5 to abut against the upper end of the buffer sleeve 6, the upper end of the positioning column 5 is circumferentially positioned with the upper end of the buffer sleeve 6, the lower end of the positioning column 5 has two supporting blades 52a protruding radially outward, and two arc-shaped oil grooves 61 are provided on the inner side wall of the buffer sleeve 6. The supporting blades 52a are arranged along the inner side wall of the buffer sleeve 6. It is radially embedded in the corresponding oil groove 61 and divides the corresponding oil groove 61 into two oil storage chambers 61a. An oil flow channel 62 connecting the two oil grooves 61 is opened in the buffer sleeve 6. The outer wall of the lower end of the positioning column 5 has an arc-shaped guide wall 53, and the guide wall 53 is arranged axially inclined downward. The buffer sleeve 6 has a guide wall 2 63 arranged on the guide wall 1 53. The guide wall 2 63 of the buffer sleeve 6 can slide along the guide wall 1 53 and make the lower end of the buffer sleeve 6 twist relative to the positioning column 5.

[0045] Working principle: A number of ejector pins 41 are vertically fixed on the side surface of the ejector plate, which are used to eject the product when the ejector plate 4 rises. The positioning column 5 is fixed on the upper end surface of the bottom plate 3. A buffer sleeve 6 is slidably connected to the positioning column 5. The buffer sleeve 6 is made of elastic material. The upper end of the buffer sleeve 6 is vertically limited by the limiting portion 51 of the positioning column 5. When the ejector plate hits the buffer sleeve 6, the lower end surface of the ejector plate first abuts against the upper end surface of the buffer sleeve 6, and the buffer sleeve 6 slides downward along the positioning column 5. The upper end of the buffer sleeve 6 and the positioning column 5 are circumferentially positioned without circumferential torsion. The lower end of the buffer sleeve 6 is attached to the guide wall 1 53 through the guide wall 2 63, and the guide wall 2 63 slides along the guide wall 1 53. The guide wall 1 53 is arranged to be inclined downward along the axial direction, and the lower end of the buffer sleeve 6 moves along the moving direction of the guide wall 2 63. Circumferential twisting occurs, and the supporting blade 52a moves relative to the oil groove 61. The relative movement of the supporting blade 52a changes the internal space of the two oil storage chambers 61a, so that the internal space of one of the oil storage chambers 61a becomes smaller, while the other internal space becomes larger. The grease in the oil groove 61 flows from the oil storage chamber 61a with a reduced internal space through the gap between the supporting blade 52a and the oil groove 61 into the other oil storage chamber 61a with an enlarged internal space. The flow of grease can produce greater damping, which, combined with the elastic force of the buffer sleeve 6 itself, has a buffering effect on the descent of the buffer sleeve 6, so that the buffer sleeve 6 buffers the resetting of the ejector plate 4, avoids the noise and vibration caused by direct hard impact, improves the stability of other components on the mold, has higher overall reliability, and improves the buffering effect of the buffer structure.

[0046] The above structure utilizes the cooperation of guide wall 1 53 and guide wall 2 63, and utilizes the elasticity of the buffer sleeve 6 itself to convert the downward movement of the buffer sleeve 6 into circumferential torsion, and the circumferential torsion force enables the supporting blade 52a to move relatively in the oil groove 61, thereby achieving the purpose of changing the internal space of the two oil storage chambers 61a. The grease inside the oil storage chamber 61a is squeezed and flows as the size of the internal space changes, and damping is generated, thereby improving the buffering effect of the buffer sleeve 6. When resetting, the buffer sleeve 6 gradually twists in the opposite direction by relying on its own elastic force, and the internal space of the oil storage chamber 61a returns to its initial state as the twisting occurs, and the grease also returns from the gap between the supporting blade 52a and the oil groove 61 and the oil flow channel 62 to the corresponding enlarged oil storage chamber 61a, thereby improving the resetting efficiency of the grease in the buffer sleeve 6.

[0047] like Figure 2 , Figure 4 , Figure 7 and Fig. 9 As shown, the outer side surface of the supporting blade 52a is arc-shaped, and the outer side surface of the supporting blade 52a is in contact with the groove wall of the oil groove 61 and can slide relative to the groove wall of the oil groove 61. The end surfaces of the upper and lower ends of the supporting blade 52a are in contact with the groove wall of the oil groove 61, and the outer side wall of the positioning column 5 is in contact with the buffer sleeve 6.

[0048] Furthermore, the outer side surface of the supporting blade 52a can be configured as an uneven buffer surface to increase the resistance of the grease flowing through the buffer surface, thereby increasing the damping of the grease flow, thereby achieving the purpose of improving the buffer effect.

[0049] like Figure 2 and Fig. 9 As shown, two oil flow channels 62 are provided, and the two oil flow channels 62 are symmetrically arranged along the axial direction of the positioning column 5 , and the oil flow channels 62 are inclined along the axial direction of the buffer sleeve 6 , and the inclination direction of the oil flow channels 62 is the same as the inclination direction of the second guide wall 63 .

[0050] like Figure 2-4 As shown, the outer wall of the positioning column 5 protrudes radially outward to form a guide strip 1 54, and the inner wall of the buffer sleeve 6 is recessed radially outward to form a mounting cavity 65. A guide strip 2 64 made of a hard material is fixedly connected to the mounting cavity 65. The guide strip 1 54 is embedded in the mounting cavity 65. The end surfaces where the guide strip 1 54 and the guide strip 2 64 are in contact with each other are the above-mentioned guide wall 1 53, and the end surfaces where the guide strip 2 64 and the guide strip 1 54 are in contact with each other are the above-mentioned guide wall 2 63. The positioning column 5 includes a fixing rod 52 fixed on the base plate 3 and a fixing nut threadedly connected to the upper end of the fixing rod 52. The fixing nut is the above-mentioned limiting portion 51. A countersunk hole 66 is provided on the upper end surface of the buffer sleeve 6. The lower end surface of the fixing nut abuts against the bottom wall of the countersunk hole 66. The guide strip 2 64 and the supporting blade 52a are axially staggered.

[0051] like Figure 2-7As shown, the buffer sleeve 6 includes a sleeve body 67 sleeved on the positioning column 5 and a mounting ring 68 connected to the lower end of the sleeve body 67, the lower end of the sleeve body 67 is provided with the above-mentioned oil groove 61, the mounting ring 68 blocks the lower notch of the oil groove 61, and the mounting ring 68 is provided with a sealing ring 7 abutting against the end face of the sleeve body 67, the lower end of the mounting ring 68 is connected to a plurality of elastic blocks 68a, the plurality of elastic blocks 68a are evenly distributed along the circumference of the mounting ring 68, the lower end of the elastic block 68a abuts against the bottom plate 3, and an extrusion gap 8 is provided between the elastic block 68a and the outer side wall of the positioning column 5. The outer side walls of the elastic block 68a are bent radially in the direction away from the positioning column 5. The purpose of this arrangement is to make it easier for the elastic block 68a to deform in the direction away from the positioning column 5, and the outer side walls of the elastic block 68a have more deformation space, so that the deformation of the elastic block 68a is not affected by the space and has sufficient deformation space. The setting of the extrusion gap 8 is to prevent the elastic block 68a from making way for the deformation toward the positioning column 5 during elastic deformation, and to provide sufficient space for the elastic block 68a to deform.

[0052] like Figure 7 and Fig.10 As shown, a limit ring 69 made of hard material is embedded on the inner side wall of the upper end of the buffer sleeve 6, and an internal spline 69a or an internal flat key is provided on the inner side wall of the limit ring 69. The limit ring 69 is connected to the positioning column 5 through the spline 69a or the flat key, and the limit ring 69 and the guide strip 2 64 are arranged axially at intervals.

[0053] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A mold buffer structure, the mold comprising a bottom plate (3) and an ejector plate (4) arranged opposite to each other, the buffer structure comprising a positioning column (5) fixedly connected to the bottom plate (3), a buffer sleeve (6) made of elastic material and arranged toward the ejector plate (4) being slidably connected to the positioning column (5), a limiting portion (51) abutting against an upper end of the buffer sleeve (6) being provided on the upper end of the positioning column (5), characterized in that: The upper end of the positioning column (5) is circumferentially positioned with the upper end of the buffer sleeve (6); the lower end of the positioning column (5) has two support blades (52a) protruding radially outward; the inner side wall of the buffer sleeve (6) is provided with two arc-shaped oil grooves (61); the support blades (52a) are radially embedded in the corresponding oil grooves (61) and divide the corresponding oil grooves (61) into two oil storage chambers (61a); the buffer sleeve (6) is provided with a passage connecting the two oil grooves (61). The oil flow passage (62) includes an arc-shaped guide wall 1 (53) on the outer side wall of the lower end of the positioning column (5), and the guide wall 1 (53) is arranged axially inclined downward, and the buffer sleeve (6) includes a guide wall 2 (63) arranged on the guide wall 1 (53), and the guide wall 2 (63) of the buffer sleeve (6) can slide along the guide wall 1 (53) and cause the lower end of the buffer sleeve (6) to twist relative to the positioning column (5), and support the blade (52a) to slide relative to the oil groove (61).

2. The mold buffer structure according to claim 1, characterized in that: The outer side surface of the support blade (52a) is arc-shaped, and the outer side surface of the support blade (52a) is in contact with the groove wall of the oil groove (61) and can slide relative to the groove wall of the oil groove (61), and the end surfaces at the upper and lower ends of the support blade (52a) are both in contact with the groove wall of the oil groove (61).

3. The mold buffer structure according to claim 1 or 2, characterized in that: Two oil flow channels (62) are provided, and the two oil flow channels (62) are symmetrically arranged along the axial direction of the positioning column (5). The oil flow channels (62) are inclined along the axial direction of the buffer sleeve (6), and the inclination direction of the oil flow channels (62) is the same as the inclination direction of the second guide wall (63).

4. The mold buffer structure according to claim 1 or 2, characterized in that: The outer wall of the positioning column (5) protrudes radially outward to form a guide strip 1 (54), and the inner wall of the buffer sleeve (6) is recessed radially outward to form a mounting cavity (65). A guide strip 2 (64) made of a hard material is fixedly connected to the mounting cavity (65). The guide strip 1 (54) is embedded in the mounting cavity (65). The end surfaces of the guide strip 1 (54) and the guide strip 2 (64) that are in contact with each other are the guide wall 1 (53), and the end surfaces of the guide strip 2 (64) and the guide strip 1 (54) that are in contact with each other are the guide wall 2 (63).

5. The mold buffer structure according to claim 4, characterized in that: The second guide strip (64) and the supporting blade (52a) are arranged axially staggered.

6. The mold buffer structure according to claim 1 or 2, characterized in that: The positioning column (5) comprises a fixing rod (52) fixed on the base plate (3) and a fixing nut threadedly connected to the upper end of the fixing rod (52), the fixing nut being the above-mentioned limiting portion (51), a countersunk hole (66) being provided on the upper end surface of the buffer sleeve (6), and the lower end surface of the fixing nut abutting against the bottom wall of the countersunk hole (66).

7. The mold buffer structure according to claim 1 or 2, characterized in that: The buffer sleeve (6) comprises a sleeve body (67) sleeved on the positioning column (5) and a mounting ring (68) connected to the lower end of the sleeve body (67); the lower end of the sleeve body (67) is provided with the above-mentioned oil groove (61); the mounting ring (68) covers the lower notch of the oil groove (61); and the mounting ring (68) is provided with a sealing ring (7) abutting against the end surface of the sleeve body (67).

8. The mold buffer structure according to claim 7, characterized in that: The lower end of the mounting ring (68) is connected to a plurality of elastic blocks (68a), the plurality of elastic blocks (68a) are evenly distributed along the circumference of the mounting ring (68), the lower end of the elastic block (68a) abuts against the bottom plate (3), and an extrusion gap (8) is provided between the elastic block (68a) and the outer side wall of the positioning column (5).

9. The mold buffer structure according to claim 4, characterized in that: A limiting ring (69) made of a hard material is inlaid on the inner side wall of the upper end of the buffer sleeve (6), and an internal spline (69a) or an internal flat key is provided on the inner side wall of the limiting ring (69). The limiting ring (69) and the positioning column (5) are connected via the spline (69a) or the flat key.

10. The mold buffer structure according to claim 9, characterized in that: The limiting ring (69) and the second guide strip (64) are arranged at intervals along the axial direction.

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