An injection mold

Abstract

The present application relates to mechanical mold technical field, specifically to a kind of injection mold, including mould one, and the mould two of mould one opposite arrangement and the ball guide pillar structure being located between mould one and mould two;Mould one and mould two can be relatively moved;Ball guide pillar structure includes fixedly arranged on the guide pillar of mould two, the ball rack of being set outside guide pillar and first spring, and the guide sleeve of being set outside ball rack and being fixedly arranged on mould one, ball rack and first spring are arranged along the axial direction of guide pillar, and ball rack is closer to mould one than first spring, the side wall of ball rack is alternately divided into several ball zones and non-ball zones along the circumference direction, several balls are movably embedded in ball zone, ball simultaneously and the inner circumferential wall of guide sleeve, the circumferential wall of guide pillar friction contact;Rotary mechanism is arranged in guide sleeve, which can drive ball rack to rotate a preset angle relative to guide sleeve when mould one and mould two are closed. Thus the contact position of ball and guide sleeve, guide pillar can be changed, and the use reliability is improved.

Description

Technical Field

[0001] This invention relates to the field of mechanical mold technology, and in particular to an injection mold. Background Technology

[0002] As the core tooling for molding injection molded products in the industrial field, the core function of injection molds is to shape the predetermined shape and structural dimensions of injection molded products through the cooperation of the cavity and the core.

[0003] The overall precision of the injection mold is the core prerequisite for determining the final precision of the injection molded product. Among the many factors affecting mold precision, the relative positioning deviation between the upper and lower mold bodies during the mold opening and closing stages is a key cause of mold precision degradation and product quality fluctuations. To avoid mold closing misalignment and ensure the accuracy of the relative movement of the upper and lower molds, ball bearing guide pillar structures are often used in injection molds to achieve precise guidance between the upper and lower molds. Most existing ball bearing guide pillar structures are similar to the ball bearing guide pillar assembly for mold bases disclosed in Chinese Patent CN222473473U, which includes a guide pillar, a second spring sleeved on the outside of the guide pillar, a ball bearing bushing sleeved on the outside of the top of the guide pillar, and a guide sleeve sleeved on the outside of the ball bearing bushing. In use, the guide sleeve moves downward, causing the balls on the outside of the ball bearing bushing to roll on the inner wall of the guide sleeve. At the same time, the ball bearing bushing presses down on the second spring to absorb the impact energy of the upper and lower molds during processing.

[0004] However, during the long-term, repeated opening and closing of the mold, the guide pillars and guide sleeves, as core guiding and mating components, will continuously and periodically roll and compress with the balls. Long-term cyclic stress and frictional wear will cause wear grooves to gradually appear on the corresponding stress areas of the outer surface of the guide pillars and the inner surface of the guide sleeves. This will disrupt the initial fit clearance between the guide pillars / guide sleeves and the balls, leading to an abnormally large fit clearance. This wear-induced clearance deviation directly weakens the guiding accuracy of the ball bearing guide pillar structure, causing misalignment risks during the opening and closing of the upper and lower molds. This not only reduces the overall operating accuracy of the mold but also directly affects the injection molding process, resulting in substandard dimensional accuracy and frequent appearance defects in the injection molded products, impacting the stability of injection molding production and product quality. Summary of the Invention

[0005] Therefore, it is necessary to provide an injection mold that addresses the problems of poor operating accuracy and low quality of injection molded products in the current use of injection molds.

[0006] The above objectives are achieved through the following technical solutions: An injection mold includes a mold body 1, a mold body 2 disposed opposite to the mold body 1, and a ball guide post structure disposed between the mold body 1 and the mold body 2; Mold body one and mold body two can move relative to each other to achieve mold closing and mold opening; The ball guide post structure includes a guide post fixed on the second mold body, a ball frame and a first spring sleeved on the outside of the guide post, and a guide sleeve sleeved on the outside of the ball frame and fixed on the first mold body. The ball frame and the first spring are arranged along the axial direction of the guide post, and the ball frame is closer to the first mold body than the first spring. The side wall of the ball frame is alternately divided into several ball areas and non-ball areas along the circumference. Several balls are movably embedded in the ball areas. The balls are in frictional contact with the inner circumferential wall of the guide sleeve and the circumferential side wall of the guide post. The guide sleeve is equipped with a rotation mechanism that can drive the ball frame to rotate relative to the guide sleeve by a preset angle when the mold body one and the mold body two are closed.

[0007] Furthermore, the rotating mechanism includes a rotating cylinder rotatably disposed at one end of the guide post near the mold body, an adjusting post inserted inside the rotating cylinder, and a connecting assembly connecting the rotating cylinder and the bead holder. The connecting assembly can both allow the bead holder to slide axially relative to the rotating cylinder and allow the rotating cylinder to drive the bead holder to rotate synchronously. A guide block is provided on the inner side wall of the rotating cylinder, and a guide groove is provided on the peripheral side wall of the adjusting post. The guide block is slidably inserted into the guide groove. Under the push of the guide sleeve, the adjusting post can elastically slide axially relative to the rotating cylinder. As the adjusting post moves axially within the rotating cylinder, under the guidance of the guide groove, the guide block sequentially drives the bead holder to rotate relative to the guide sleeve by a preset angle through the rotating cylinder and the connecting assembly.

[0008] Furthermore, the guide groove is a ring structure and includes several groove units connected end to end. Each groove unit includes a vertical groove and an oblique groove. The vertical groove extends along the axial direction of the adjusting column, and the oblique groove is set at an angle, with its two ends connected to different ends of two adjacent vertical grooves respectively.

[0009] Furthermore, the connecting assembly includes a slide bar 1 provided on the inner peripheral wall of the bead frame and a notch provided on the outer peripheral wall of the rotating cylinder. The slide bar 1 extends along the axial direction of the bead frame and is adapted to the shape of the notch, and is slidably inserted into the notch. It may include a second slide bar on the outer wall of the rotating cylinder and a first slide groove on the inner circumferential wall of the bead holder. The second slide bar extends along the axial direction of the rotating cylinder, and the first slide groove extends along the axial direction of the bead holder. The second slide bar and the first slide groove are matched in shape and are slidably inserted into the first slide groove.

[0010] Furthermore, a slip ring 1 is slidably sleeved on the guide post, and the slip ring 1 is closer to the mold body 2 than the first spring; the two ends of the first spring are respectively located on the bead cage and the slip ring 1; a housing is provided at the end of the guide post near the mold body 2, and the housing fixes the guide post to the mold body 2; a stop component is provided inside the housing to stop the slip ring 1 on the guide post, and the stop component is activated / deactivated after the guide sleeve moves to a preset position; an elastic telescopic tube is also provided inside the housing, and the elastic telescopic tube is sleeved on the outside of the guide post and can elastically expand and contract along the axial direction; a slip ring 2 is provided at the end of the elastic telescopic tube away from the mold body 2, and the slip ring 2 is simultaneously and sealingly slidably sleeved on the guide post, and the slip ring 2 can form a stop engagement with the slip ring 1, the slip ring 2, A first chamber is formed by the elastic telescopic tube and the guide post together; a base tube is fitted over the elastic telescopic tube; a sealing plug is fitted over the base tube, and the sealing plug is in sealing contact with both the outer wall of the base tube and the inner wall of the shell, and can slide along the axial direction of the guide post under the pushing of the guide sleeve; a second chamber is formed by the sealing plug, the shell, and the base tube together; a third chamber is formed inside the shell, and the third chamber is connected to the second chamber; a fourth chamber is formed inside the guide post, and the fourth chamber is connected to both the third chamber and the first chamber; the first, second, third, and fourth chambers are filled with fluid; a one-way damping component is provided at the connection between the first and fourth chambers, which generates damping when the fluid in the first chamber flows into the fourth chamber.

[0011] Furthermore, the stop assembly includes at least one stop block, which is capable of elastically sliding along the radial direction of the guide post and has a tapered portion, the tapered surface of which can form a stop engagement with the guide sleeve and the slip ring.

[0012] Furthermore, the fluid is a liquid.

[0013] Furthermore, the liquid is hydraulic oil.

[0014] Furthermore, the circumferential areas covered by the ball bearing area and the non-ball bearing area are equal; the preset angle is equal to the central angle corresponding to the ball bearing area.

[0015] Furthermore, there are multiple ball bearing guide post structures.

[0016] The beneficial effects of this invention are: This invention relates to an injection mold, which features a ball bearing cage whose sidewalls are alternately divided into several ball bearing and non-ball bearing areas along the circumference. A rotating mechanism is then incorporated, utilizing the characteristic that the rotating mechanism can rotate the ball bearing cage relative to the guide bushing by a preset angle when mold body one and mold body two are closed. During injection molding, this mechanism can change the contact positions of the guide bushing, guide post, and ball bearings, and also allow the ball bearings to rotate at multiple angles, thereby altering the contact positions between the ball bearings and the guide bushing and guide post. This results in the corresponding stress areas on the outer surface of the guide post and the inner surface of the guide bushing being evenly distributed along the circumference and axial direction, ensuring the fit clearance between the guide post, guide bushing, and ball bearings, and thus guaranteeing the guiding accuracy of the ball bearing guide post structure and the quality of the injection molded product. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of an injection mold provided in an embodiment of the present invention; Figure 2 This is a side view of the injection mold provided in an embodiment of the present invention; Figure 3 for Figure 2 Sectional view along the AA direction; Figure 4 for Figure 3 A magnified schematic diagram of the structure at point X in the middle; Figure 5 A three-dimensional structural diagram of the ball guide post structure of the injection mold provided in an embodiment of the present invention; Figure 6 A top view schematic diagram of the ball guide post structure of the injection mold provided in an embodiment of the present invention; Figure 7 for Figure 6 Sectional view along the BB direction; Figure 8 for Figure 7 A magnified schematic diagram of the structure at point Y in the middle; Figure 9 An exploded view of the ball guide post structure of the injection mold provided in an embodiment of the present invention; Figure 10 for Figure 9 A magnified schematic diagram of the structure at point Z in the middle.

[0018] in: 1. Mold body one; 101. Install blind holes; 2. Mold body two; 201. Mounting hole two; 3. Ball bearing guide post structure; 301, guide post; 3011, chamber four; 302, ball cage; 3021, ball bearing area; 3022, non-ball bearing area; 303, first spring; 304, guide sleeve; 3041, flange two; 305, end cap; 3051, sliding hole; 3052, sliding groove two; 306, ball bearing; 307, housing; 3071, mounting hole one; 3072, flange one; 3073, chamber three; 308, gasket; 401. Rotating cylinder; 4011. Guide block; 4012. Ring platform two; 402. Adjusting column; 4021. Sliding convexity; 4022. Ring platform one; 4023. Guide groove; 40231. Vertical dividing groove; 40232. Angled dividing groove; 4031. Sliding bar one; 404. Second spring; 5. Slip ring one; 6. Stop assembly; 601. Stop block; 6011. Tapered part; 6012. Rod part; 602. Third spring; 7. Flexible telescopic tube; 701. Fixing part; 8. Slip ring two; 9. Chamber 1; 10. Base tube; 1001. Ring platform three; 11. Sealing plug; 1101. Ring platform four; 12. Second chamber; 13. One-way damping assembly; 1301. Base; 1302. Valve ball; 13021. Flow hole; 1303. Fourth spring. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0020] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage," unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] In the process of manufacturing injection molded products, injection molds are required. An injection mold includes a mold body 1 and a mold body 2 positioned opposite to it. Both mold bodies 1 and 2 can be square structures, and grooves and protrusions are respectively provided on the adjacent walls of mold bodies 1 and 2. When mold bodies 1 and 2 are closed, the grooves and protrusions together form an injection mold cavity. The shape and size of the injection mold cavity match the injection molded product, facilitating the formation of the injection molded product after receiving the injection liquid. Mold bodies 1 and 2 can move relative to each other to achieve mold closing and opening.

[0023] Taking a vertically arranged mold body 1 and mold body 2 as an example, mold body 1 is located above mold body 2; mold body 2 remains stationary; mold body 1 can move vertically under a driving force, such as hydraulic drive, thus realizing relative movement between mold body 1 and mold body 2. Specifically, when mold body 1 moves downwards under a driving force, such as hydraulic drive, that is, mold body 1 moves closer to mold body 2, mold closing is achieved; when mold body 1 moves upwards under a driving force, such as hydraulic drive, that is, mold body 1 moves away from mold body 2, mold opening is achieved. To ensure the guiding accuracy of mold body 1 and mold body 2 during mold opening and closing and to improve the quality of injection molded products, a ball bearing guide post structure 3 is usually provided between mold body 1 and mold body 2.

[0024] The ball bearing guide post structure 3 includes a guide post 301 fixedly mounted on the mold body 2, a ball holder 302 sleeved on the outside of the guide post 301, a first spring 303, and a guide sleeve 304 sleeved on the outside of the ball holder 302 and fixedly mounted on the mold body 1. The guide post 301 is a cylindrical structure and is vertically arranged; the ball holder 302 is a cylindrical structure and is vertically arranged; the first spring 303 is vertically arranged; and the guide sleeve 304 is a cylindrical structure and is vertically arranged. The ball holder 302 and the first spring 303 are arranged along the axial direction of the guide post 301, with the ball holder 302 closer to the mold body 1 than the first spring 303, i.e., the ball holder 302 is on top and the first spring 303 is on the bottom. An end cap 305 is fastened to the top opening of the guide sleeve 304, and the end cap 305 can be fitted with the top of the ball holder 302. The stop mechanism is designed so that when the mold body 1 moves downward together with the guide sleeve 304, the guide sleeve 304 can drive the ball holder 302 to move downward synchronously through the stop mechanism between the end cap 305 and the top of the ball holder 302. The lower end of the ball holder 302 contacts the top of the first spring 303, and the bottom end of the first spring 303 contacts the bottom end of the guide post 301. When the ball holder 302 moves downward, the first spring 303 is compressed, which helps to absorb the impact energy generated by the mold body 1 and the mold body 2 during the movement. Several balls 306 are movably embedded in the side wall of the ball holder 302. The balls 306 simultaneously make frictional contact with the inner peripheral wall of the guide sleeve 304 and the peripheral side wall of the guide post 301. When the ball holder 302 moves downward, the balls 306 roll synchronously, which helps to reduce frictional resistance.

[0025] During operation, mold body 1 is first moved downwards by hydraulic pressure, bringing it closer to mold body 2 to achieve mold closing, thus forming an injection mold cavity between the groove and the punch. Then, molten plastic is injected into the injection mold cavity to complete injection molding. Next, mold body 1 is moved upwards by hydraulic pressure, moving it away from mold body 2 to achieve mold opening. Repeating this process allows for continuous processing of injection-molded products.

[0026] During the downward movement of mold body 1, mold body 1 simultaneously drives guide sleeve 304 downward. Guide sleeve 304 then drives ball holder 302 downward through the stop between end cap 305 and the top of ball holder 302. As ball holder 302 moves, first spring 303 is compressed synchronously, absorbing the impact energy generated by mold body 1 and mold body 2 during movement. Balls 306 roll synchronously to reduce frictional resistance. During the upward movement of mold body 1, mold body 1 simultaneously drives guide sleeve 304 upward. First spring 303 is released, driving ball holder 302 upward. As ball holder 302 moves, balls 306 roll synchronously to reduce frictional resistance.

[0027] After a period of use, the guide post 301 and guide sleeve 304, as core guiding and mating components, will continuously undergo periodic rolling contact and compression with the ball 306. Under the dual influence of long-term cyclic stress and frictional wear, wear grooves will gradually form on the corresponding stress areas of the outer surface of the guide post 301 and the inner surface of the guide sleeve 304, thereby destroying the initial mating clearance between the guide post 301, guide sleeve 304 and ball 306, resulting in an abnormal increase in the mating clearance. This kind of clearance deviation caused by wear will directly weaken the guiding accuracy of the ball guide post structure 3, causing misalignment risks to reappear during the opening and closing of mold body 1 and mold body 2. This will not only reduce the overall running accuracy of the mold, but will also be directly transmitted to the injection molding process, causing problems such as substandard dimensional accuracy and frequent appearance defects in injection molded products, thus affecting the stability of injection molding production and the level of product quality control. Therefore, in order to ensure the guiding performance of the ball guide post structure 3, it is necessary to improve the existing ball guide post structure 3.

[0028] Based on this, in the injection mold provided in the embodiments of the present invention, such as Figures 1 to 10 As shown, the sidewall of its ball cage 302 is alternately divided into several ball bearing areas 3021 and non-ball bearing areas 3022 along the circumference. The shapes of the ball bearing areas 3021 and non-ball bearing areas 3022 can both be set as arc-shaped vertical sheet areas, or they can be set as... Figure 9The arc-shaped inclined plate-like area shown in the figure has a number of balls 306 movably embedded in the ball area 3021. The balls 306 simultaneously rub against the inner peripheral wall of the guide sleeve 304 and the peripheral side wall of the guide post 301. Furthermore, the guide sleeve 304 is provided with a rotation mechanism that can drive the ball frame 302 to rotate relative to the guide sleeve 304 by a preset angle when the mold body 1 and the mold body 2 are closed.

[0029] Therefore, during the mold closing process, the rotating mechanism is triggered by the linkage action of the mold closing action, causing the ball holder 302 to rotate circumferentially relative to the guide sleeve 304 at a preset angle. This rotation action directly changes the corresponding action area of ​​the ball bearing area 3021 on the outer wall of the guide post 301 and the inner peripheral wall of the guide sleeve 304 on the ball holder 302, causing the surface positions of the guide post 301 and the guide sleeve 304 that were originally in contact with the ball bearing 306 to switch circumferentially; on the other hand, the circumferential rotation of the ball holder 302 synchronously causes the ball bearing 306 to roll along the circumference of the ball holder 302. Combined with the rolling of the ball bearing 306 along the axial direction of the ball holder 302 caused by the axial movement of the ball holder 302 with the guide sleeve 304 during the mold closing process, the contact position of the ball bearing 306 on the outer wall of the guide post 301 and the inner peripheral wall of the guide sleeve 304 is switched bidirectionally along the circumferential and axial directions. This ensures that the stress areas on the outer surface of the guide post 301 and the inner surface of the guide sleeve 304 are no longer concentrated in the fixed part, but are evenly distributed along the circumference and axial direction. This fundamentally avoids the formation of wear grooves in local areas due to long-term repeated squeezing and friction by the balls 306, effectively maintaining the initial fit clearance between the guide post 301, the guide sleeve 304 and the balls 306, ensuring the guiding accuracy of the ball guide post structure 3 after long-term use, and thus continuously stabilizing the opening and closing positioning accuracy of the injection mold, ensuring the dimensional accuracy and molding quality of the injection molded product.

[0030] To facilitate the fixing of the guide post 301 and the mold body 2, a housing 307 is coaxially sleeved on the outer side of the bottom end of the guide post 301. The housing 307 has a cylindrical structure with an open top to allow the guide post 301 to pass through. A mounting hole 3071 is coaxially formed at the bottom of the housing 307. The mounting hole 3071 is a concentric circular hole, smaller at the top and larger at the bottom. The guide post 301 is a concentric cylinder, larger at the top and smaller at the bottom. During installation, the smaller end of the guide post 301 is inserted into the smaller end of the mounting hole 3071. Fasteners, such as screws, are coaxially inserted at the bottom of the guide post 301. The screw head and... A gasket 308 is provided between the small ends of the guide post 301. The gasket 308 is matched and located in the large end of the mounting hole 3071 to lock the guide post 301 onto the housing 307. The top of the mold body 2 is provided with a mounting hole 201, which is a concentric circular hole with a larger upper part and a smaller lower part. A flange 3072 is provided on the outer peripheral wall of the housing 307. During installation, the flange 3072 is matched and inserted into the large end of the mounting hole 3071 and fixed to the mold body 2 by fasteners such as bolts to lock the housing 307 onto the mold body 2, thereby fixing the guide post 301 onto the mold body 2.

[0031] To facilitate the fixing of the guide sleeve 304 and the mold body 1, a blind mounting hole 101 is provided at the bottom of the mold body 1. The blind mounting hole 101 is a concentric circle blind hole with a smaller top and a larger bottom. A flange 2 3041 is provided on the outer peripheral wall of the guide sleeve 304. During installation, the flange 2 3041 is fitted into the larger end of the blind mounting hole 101 and fixed to the mold body 1 by fasteners such as bolts, so as to fix the guide sleeve 304 to the mold body 1, so that the guide sleeve 304 can move synchronously with the mold body 1 and achieve synchronous up and down displacement.

[0032] In one embodiment, the rotating mechanism includes a rotating cylinder 401 rotatably disposed at the end of the guide post 301 near the mold body 1, an adjusting post 402 inserted inside the rotating cylinder 401, and a connecting assembly connecting the rotating cylinder 401 and the bead holder 302. The rotating cylinder 401 has an open top to facilitate the passage of the adjusting post 402. Specifically, the rotating cylinder 401 is located at the top of the guide post 301 and is coaxially arranged with the guide post 301. Fasteners, such as… The screw and guide post 301 are rotatably connected, or the rotatable connection between the rotating cylinder 401 and the guide post 301 can be achieved through the insertion and rotatable engagement between the T-shaped columnar protrusion and the T-shaped columnar groove. Taking the T-shaped columnar protrusion on the rotating cylinder 401 and the T-shaped columnar groove on the guide post 301 as an example, the T-shaped columnar groove is coaxial and inverted on the top of the guide post 301, and the T-shaped columnar protrusion is coaxial and inverted on the bottom of the rotating cylinder 401, and is rotatably inserted into the T-shaped columnar groove during installation.

[0033] The adjusting column 402 and the rotating cylinder 401 are coaxially arranged, with the bottom end passing through the top opening of the rotating cylinder 401 and inserted into the interior of the rotating cylinder 401. A sliding hole 3051 is provided on the top of the end cap 305, and the top end of the adjusting column 402 passes through the sliding hole 3051. A second sliding groove 3052 is provided on the side wall of the sliding hole 3051, extending axially along the guide sleeve 304. A sliding protrusion 4021 is provided on the peripheral side wall of the adjusting column 402. The sliding protrusion 4021 is a strip-shaped structure, extending axially along the adjusting column 402, and its shape matches the second sliding groove 3052. During installation, the sliding protrusion 4021 slides through the second sliding groove 3052. With the cooperation of the sliding protrusion 4021 and the second sliding groove 3052, the adjusting column 402 can slide axially. A ring is provided on the middle peripheral side wall of the adjusting column 402. Platform 4022, ring platform 4022, and adjusting column 402 together form a cross-shaped column structure, which can form a stop engagement with end cover 305. When guide sleeve 304 moves downward, it can drive adjusting column 402 to move axially downward relative to rotating cylinder 401 through the stop engagement between end cover 305 and ring platform 4022. A second spring 404 is vertically provided inside rotating cylinder 401. The two ends of the second spring 404 are respectively located at the bottom of adjusting column 402 and the bottom of rotating cylinder 401 to realize elastic sliding of adjusting column 402 along the axial direction. When adjusting column 402 moves downward, second spring 404 is compressed. When guide sleeve 304 moves upward, second spring 404 is released, synchronously driving adjusting column 402 to move upward, so as to realize the reset of adjusting column 402.

[0034] The inner wall of the rotating cylinder 401 is provided with a guide block 4011, and the peripheral wall of the adjusting column 402 is provided with a guide groove 4023. The guide block 4011 is slidably inserted into the guide groove 4023. The connecting assembly can both allow the bead holder 302 to slide axially relative to the rotating cylinder 401 and allow the rotating cylinder 401 to drive the bead holder 302 to rotate synchronously, thus avoiding motion interference while ensuring that the rotating cylinder 401 can synchronously drive the bead holder 302 to rotate.

[0035] During the mold closing process, as the guide sleeve 304 moves down, the end cover 305 moves down synchronously. When the end cover 305 and the ring platform 4022 stop, as the end cover 305 continues to move down, the adjusting column 402 moves down under the push of the end cover 305, the second spring 404 is compressed, and under the guiding cooperation between the sliding protrusion 4021 and the sliding groove 3052 and the guidance of the guide groove 4023, the guide block 4011 drives the ball frame 302 to rotate relative to the guide sleeve 304 by a preset angle through the rotating cylinder 401 and the connecting assembly.

[0036] During the mold opening process, as the guide sleeve 304 moves upward, the end cap 305 moves upward synchronously, the second spring 404 is released, and the adjusting column 402 moves upward synchronously to achieve reset.

[0037] In one embodiment, such as Figure 10 As shown, the guide groove 4023 is an annular structure and is coaxially arranged with the adjusting column 402. It includes several groove units connected end to end. Each groove unit includes a vertical groove 40231 and an oblique groove 40232. The vertical groove 40231 extends along the axial direction of the adjusting column 402. The oblique groove 40232 is inclined and its two ends are respectively connected to the different ends of two adjacent vertical grooves 40231. That is, the oblique groove 40232 is connected to the upper end and the lower end of two adjacent vertical grooves 40231 respectively.

[0038] It should be noted that the bottom of the vertical groove 40231 needs to be a slope or arc surface and face the next inclined groove 40232. This ensures that when the adjusting column 402 moves downward, the guide block 4011 will only move along the next inclined groove 40232 under the guidance of the guide groove 4023, and will not move along the vertical groove 40231 in which it is located, thus ensuring that the rotating cylinder 401 can rotate.

[0039] Initially, the guide block 4011 is located at the bottom of the vertical slot 40231.

[0040] During the mold closing process, as the guide sleeve 304 moves downward, the end cover 305 moves downward synchronously. When the end cover 305 and the ring platform 4022 stop, as the end cover 305 continues to move downward, the adjusting column 402 moves downward under the push of the end cover 305, and the second spring 404 is compressed. At this time, the rotating cylinder 401 moves upward relative to the adjusting column 402, and the guide block 4011 moves along... Figure 10 The guide block 4011 moves along the oblique arrow trajectory, first entering the bottom of the vertical slot 40231 and then sliding upwards along the oblique slot 40232, finally moving to the top of the oblique slot 40232. During the sliding process of the guide block 4011 within the oblique slot 40232, the rotating cylinder 401 rotates synchronously.

[0041] During the mold opening process, as the guide sleeve 304 moves upward, the end cap 305 moves upward simultaneously, the second spring 404 is released, and the adjusting column 402 moves upward synchronously. While achieving reset, the rotating cylinder 401 moves downward relative to the adjusting column 402, and the guide block 4011 moves along... Figure 10 The vertical arrow in the text moves along the trajectory of the vertical slot 40231, that is, it moves to the bottom of the slot 40231.

[0042] In one embodiment, the connecting assembly may include a slide bar 4031 on the inner peripheral wall of the bead holder 302 and a notch on the outer peripheral wall of the rotating cylinder 401. The slide bar 4031 extends axially along the bead holder 302 and is adapted to the shape of the notch, and is slidably inserted into the notch. The notch is specifically located on the peripheral side wall of the annular platform 4012 provided on the outer peripheral wall of the bottom end of the rotating cylinder 401. In this way, the bead holder 302 can slide axially relative to the rotating cylinder 401, and the rotating cylinder 401 can drive the bead holder 302 to rotate synchronously, thus avoiding motion interference while ensuring that the rotating cylinder 401 can synchronously drive the bead holder 302 to rotate.

[0043] In other embodiments, the connecting assembly may also include a second slide bar on the outer wall of the rotating cylinder 401 and a first slide groove on the inner peripheral wall of the bead holder 302. The second slide bar extends axially along the rotating cylinder 401, and the first slide groove extends axially along the bead holder 302. The second slide bar and the first slide groove are shaped to match each other and are slidably inserted into the first slide groove. In this way, the bead holder 302 can slide axially relative to the rotating cylinder 401, and the rotating cylinder 401 can drive the bead holder 302 to rotate synchronously. This avoids motion interference while ensuring that the rotating cylinder 401 can synchronously drive the bead holder 302 to rotate.

[0044] It is understandable that the second slider can also be located on the circumferential sidewall of the second ring platform 4012.

[0045] In one embodiment, to improve the wear uniformity of the ball bearing 306, a slip ring 5 is slidably sleeved on the guide post 301. The slip ring 5 is closer to the mold body 2 than the first spring 303, i.e., the slip ring 5 is located below the first spring 303. The two ends of the first spring 303 are respectively disposed on the ball cage 302 and the slip ring 5. A stop assembly 6 is provided inside the housing 307 to stop the slip ring 5 on the guide post 301, and the stop assembly 6 is activated / deactivated after the guide sleeve 304 moves to a preset position. An elastic telescopic tube 7 is also provided inside the housing 307, which is sleeved on the outside of the guide post 301 and can elastically expand and contract along the axial direction. The bottom end is bent inward horizontally to form a fixing part 701. The fixing part 701 is an annular plate structure. The fixing part 701 is clamped by the bottom of the large end of the guide post 301 and the bottom of the inner cylinder of the shell 307 to fix the elastic telescopic tube 7. The elastic telescopic tube 7 can be set in a corrugated shape. The end of the elastic telescopic tube 7 away from the mold body 2 is provided with a slip ring 2 8, that is, the slip ring 2 8 is located above the elastic telescopic tube 7. The slip ring 2 8 is simultaneously sealed and slidably sleeved on the guide post 301. The slip ring 2 8 can form a stop fit with the slip ring 1 5. The bottom end face of the slip ring 2 8, the inner tube surface of the elastic telescopic tube 7 and the bottom outer peripheral wall of the guide post 301 together form a cavity 9.

[0046] A base cylinder 10 is fitted over the elastic telescopic tube 7. The top of the base cylinder 10 is open to facilitate the passage of the elastic telescopic tube 7. A through hole is provided at the bottom of the inner part of the base cylinder 10. The base cylinder 10 is sleeved on the guide post 301 through the through hole, and the bottom of the base cylinder 10 is clamped between the fixing part 701 and the bottom of the inner part of the housing 307 to fix the base cylinder 10. A sealing plug 11 is fitted over the base cylinder 10. The sealing plug 11 has an annular structure and makes sealing contact with both the outer wall of the base cylinder 10 and the inner wall of the housing 307. Under the push of the guide sleeve 304, it can slide along the axial direction of the guide post 301. An annular platform 1001 is provided on the outer peripheral wall of the top end of the base cylinder 10, and an annular platform 1001 is provided on the inner peripheral wall of the bottom end of the sealing plug 11. A fourth ring platform 1101 is provided, and a third ring platform 1001 can form a stop with the fourth ring platform 1101 to limit the upward movement of the sealing plug 11. A second chamber 12 is formed by the bottom end face of the sealing plug 11, the inner peripheral wall of the bottom of the housing 307, and the outer peripheral wall of the bottom of the base cylinder 10. A third chamber 3073 is formed inside the bottom of the housing 307, and the third chamber 3073 communicates with the second chamber 12. A fourth chamber 3011 is formed inside the bottom of the guide post 301, and the fourth chamber 3011 communicates with both the third chamber 3073 and the first chamber 9. The first chamber 9, the second chamber 12, the third chamber 3073, and the fourth chamber 3011 are filled with fluid. When the sealing plug 11 moves downward, the fluid flows along... Figure 8 The fluid flows in the direction of path a, that is, sequentially along chamber two 12, chamber three 3073, chamber four 3011, and chamber one 9. Under fluid pressure, the elastic expansion tube 7 extends, and the slip ring two 8 moves upward along the guide post 301. When the external force driving the sealing plug 11 to move disappears, the elastic expansion tube 7 shortens and returns to its original position, and the fluid flows along... Figure 8 The fluid flows in the opposite direction along path a, that is, sequentially along chamber 9, chamber 3011, chamber 3073, and chamber 12. Under fluid pressure, the sealing plug 11 moves upward until it is reset. A one-way damping component 13 is provided at the connection between chamber 9 and chamber 3011. When the fluid in chamber 9 flows into chamber 3011, damping is generated, which makes the elastic telescopic tube 7 and slip ring 8 reset slowly.

[0047] Initially, the stop assembly 6 is activated, and the position of slip ring 5 on guide post 301 remains unchanged.

[0048] During the mold closing process, mold body 1 drives guide sleeve 304 to move downward. When guide sleeve 304 moves to the preset position, stop assembly 6 fails, and slip ring 5 can slide downward along guide post 301. At the same time, guide sleeve 304 drives ball cage 302 to move downward through end cap 305, and ball cage 302 drives slip ring 8 to move downward through first spring 303 until slip ring 5 and slip ring 8 contact each other. When guide sleeve 304 moves to contact sealing plug 11, as guide sleeve 304 continues to move downward, sealing plug 11 is pushed downward, and fluid flows along... Figure 8The fluid flows in the direction of path a, that is, along chamber 2 12, chamber 3 3073, chamber 4 3011, and chamber 1 9 in sequence. Under the fluid pressure, the elastic telescopic tube 7 extends, the slip ring 2 8 moves upward along the guide post 301, and simultaneously drives the slip ring 1 5 to move upward. The first spring 303 is compressed (the degree of compression is greater than before).

[0049] During the mold opening process, the mold body 1 moves the guide sleeve 304 upward. At this time, the external force driving the sealing plug 11 to move disappears, the elastic telescopic tube 7 shortens and returns to its original position, and the fluid flows along... Figure 8 The fluid flows in the opposite direction along path a, i.e., sequentially along chamber 1 (9), chamber 4 (3011), chamber 3 (3073), and chamber 2 (12). Under fluid pressure, the sealing plug 11 moves upward. Simultaneously, under the action of the one-way damping component 13, the fluid movement is slow, the elastic telescopic tube 7 shortens slowly, and the slip ring 2 (8) slowly returns to its original position downward. At this time, because the first spring 303 has a large elastic potential energy, it can push the ball holder 302 to move upward together with the guide sleeve 304, ensuring that a large number of balls 306 roll between the ball holder 302 and the guide sleeve 304. This ensures both the stability of the guide sleeve 304 during movement and the uniformity of wear of the balls 306. When the guide sleeve 304 moves to the preset position again, the stop component 6 takes effect, and the position of the slip ring 1 (5) on the guide post 301 remains unchanged.

[0050] In one embodiment, the stop assembly 6 includes at least one stop block 601, which is capable of sliding elastically along the radial direction of the guide post 301 and is disposed near the top of the housing 307. The position of the stop block 601 is a preset position. The stop block 601 has a tapered portion 6011 and a rod portion 6012. The tapered surface of the tapered portion 6011 can form a stop engagement with the guide sleeve 304 and the slip ring 5, which facilitates the guide sleeve 304 to change the failure / activation state of the stop assembly 6 and to lock the position of the slip ring 5. The rod portion 601... 2. Extending radially along the guide post 301 and penetrating outward through the housing 307, a screw is inserted at the outer end of the rod 6012. The screw is located on the outside of the housing 307, and the screw head can form a stop engagement with the outer wall of the housing 307 to limit the position of the stop block 601 sliding inward. A third spring 602 is sleeved on the rod 6012. The two ends of the third spring 602 are located between the inner wall of the housing 307 and the tapered part 6011 to realize the elastic sliding of the stop block 601 along the radial direction of the guide post 301, thereby facilitating the reset of the tapered part 6011.

[0051] It is understandable that when there are multiple stop blocks 601, the multiple stop blocks 601 are arranged circumferentially to ensure that the force on the slip ring 5 is uniform.

[0052] It should be noted that when the elastic telescopic tube 7 is extended to its maximum length, the position of the slip ring 2 8 is above the preset position, ensuring that when the stop component 6 is activated again, the slip ring 1 5 is above or at the preset position, thus avoiding motion interference.

[0053] In one embodiment, the unidirectional damping assembly 13 includes a base 1301, which is a tubular structure and is horizontally inserted inside the guide post 301, with a fluid channel formed on its inner side to connect chamber 1 (9) and chamber 4 (3011). A valve ball 1302 is movably inserted into the base 1301, and the valve ball 1302 is positioned close to chamber 4 (3011). A fourth spring 1303 is also inserted into the base 1301, and the fourth spring 1303 is horizontally positioned and positioned closer to chamber 1 (9) than the valve ball 1302, with its two ends respectively located on the base 1301 and the valve ball 1302. The fourth spring 1303 on 302 allows the valve ball 1302 to move outward, thus enabling unidirectional communication between chamber 4 3011 and chamber 1 9, with the flow direction from chamber 4 3011 to chamber 1 9. A flow hole 13021 is provided on the valve ball 1302, which is connected to both the base 1301 and chambers 1 9 and 4 3011. When fluid flows from chamber 1 9 to chamber 4 3011, the fluid can flow from chamber 1 9 to chamber 4 3011 through the flow hole 13021, thereby achieving a damping effect.

[0054] In one embodiment, the fluid may be a liquid, such as hydraulic oil.

[0055] In other embodiments, the fluid may also be a gas, such as air.

[0056] In one embodiment, the ball bearing area 3021 and the non-ball bearing area 3022 on the side wall of the ball bearing holder 302 are arranged alternately along the circumference, and the circumferential area covered by the two is equal; at the same time, the preset angle for the rotating mechanism to drive the ball bearing holder 302 to rotate relative to the guide sleeve 304 is set to be consistent with the central angle corresponding to a single ball bearing area 3021. Thus, when the ball holder 302 completes the circumferential rotation at a preset angle during the mold closing process, the areas of the inner peripheral wall of the guide sleeve 304 and the outer peripheral wall of the guide post 301 that were originally in contact with the ball 306 will be precisely switched with the areas that were not in contact with the ball 306. That is, the contact areas of the guide sleeve 304 and the guide post 301 corresponding to the ball area 3021 and the non-ball area 3022 are circumferentially interchanged. This allows all circumferential areas of the inner peripheral wall of the guide sleeve 304 and the outer peripheral wall of the guide post 301 to sequentially form contact with the ball 306 during the repeated opening and closing of the mold body 1 and the mold body 2, so that the circumferential surfaces of the guide sleeve 304 and the guide post 301 can evenly bear the friction and compression of the ball 306.

[0057] In one embodiment, to further improve the guiding accuracy and motion stability during the mold opening and closing process of mold body 1 and mold body 2, the ball bearing guide pillar structure 3 in this injection mold adopts a multi-set arrangement. Thus, through the synchronous cooperation and coordinated guidance of multiple ball bearing guide pillar structures 3, a multi-point precise positioning and constraint system is formed, ensuring that the relative movement of mold body 1 and mold body 2 is always under the common constraint of multiple sets of guide pillars 301 and guide sleeves 304. This effectively avoids problems such as local offset and uneven force on one side that are prone to occur with a single set of guiding structures, making the displacement trajectory of the mold body during the mold opening and closing process more closely follow the preset path, further improving the overall guiding and positioning accuracy of the mold, and providing a more reliable guarantee for the molding accuracy of injection molded products from the structural layout level.

[0058] Specifically, taking both mold body 1 and mold body 2 as square structures as an example, the number of ball guide pillar structures 3 can be set to four, and they are respectively set at the four corners of mold body 1 and mold body 2.

[0059] Based on the above embodiments, the usage principle and working process of the embodiments of the present invention are as follows: During operation, mold body 1 is first moved downwards by hydraulic pressure, bringing it closer to mold body 2 to achieve mold closing, thus forming an injection mold cavity between the groove and the punch. Then, molten plastic is injected into the injection mold cavity to complete injection molding. Next, mold body 1 is moved upwards by hydraulic pressure, moving it away from mold body 2 to achieve mold opening. Repeating this process allows for continuous processing of injection-molded products.

[0060] During the downward movement of mold body 1, mold body 1 synchronously drives guide sleeve 304 to move downward. Guide sleeve 304 then drives ball frame 302 to move downward through the stop between end cap 305 and the top of ball frame 302. When ball frame 302 moves, first spring 303 is compressed synchronously to absorb the impact energy generated by mold body 1 and mold body 2 during the movement. Balls 306 roll synchronously to reduce frictional resistance.

[0061] Simultaneously, as the guide sleeve 304 moves downward, the end cover 305 moves downward in sync. When the end cover 305 and the ring platform 4022 stop, as the end cover 305 continues to move downward, the adjusting column 402 moves downward under the push of the end cover 305, and the second spring 404 is compressed. At this time, the rotating cylinder 401 moves upward relative to the adjusting column 402, and the guide block 4011 moves along... Figure 10The diagonal arrow trajectory moves, that is, it first enters the bottom of the vertical slot 40231 and then slides upward along the diagonal slot 40232, and finally moves to the top of the diagonal slot 40232. During the sliding process of the guide block 4011 in the inclined slot 40232, the rotating cylinder 401 simultaneously drives the ball frame 302 to rotate at a preset angle through the cooperation between the slide bar 4031 and the notch. This rotation directly changes the corresponding action area of ​​the ball area 3021 on the outer wall of the guide post 301 and the inner peripheral wall of the guide sleeve 304 on the ball frame 302, causing the circumferential position of the guide post 301 and the guide sleeve 304 that were originally in contact with the ball 306 to switch. On the other hand, the circumferential rotation of the ball frame 302 simultaneously drives the ball 306 to roll along the circumference of the ball frame 302. Combined with the rolling of the ball 306 along the axial direction of the ball frame 302 caused by the axial movement of the ball frame 302 with the guide sleeve 304 during the mold closing process, the contact position of the ball 306 on the outer wall of the guide post 301 and the inner peripheral wall of the guide sleeve 304 is switched in both the circumferential and axial directions.

[0062] When the guide sleeve 304 moves to the preset position, as the guide sleeve 304 continues to move downward, the guide sleeve 304, through the cooperation between itself and the conical surface of the conical portion 6011 of the stop block 601, drives the stop block 601 to move outward, and the third spring 602 is compressed; subsequently, the slip ring 5 can slide downward along the guide post 301; the ball holder 302 drives the slip ring 8 downward through the first spring 303 until the slip ring 5 and the slip ring 8 contact; when the guide sleeve 304 moves to contact the sealing plug 11, as the guide sleeve 304 continues to move downward, the sealing plug 11 is pushed downward, and the fluid flows along Figure 8 The fluid flows in the direction of path a, that is, along chamber two 12, chamber three 3073, chamber four 3011, and chamber one 9 in sequence. When the fluid flows through the base 1301, under the fluid pressure, the valve ball 1302 is pushed outward, the fourth spring 1303 is compressed, the fluid channel in the base 1301 is fully opened, the elastic telescopic tube 7 then extends, and simultaneously drives the slip ring two 8 to move upward along the guide post 301, and simultaneously drives the slip ring one 5 to move upward, and the first spring 303 is compressed (the degree of compression is greater than before).

[0063] During the upward movement of mold body 1, mold body 1 synchronously drives guide sleeve 304 to move upward, the first spring 303 is released, driving ball holder 302 to move upward. As ball holder 302 moves, the balls 306 roll synchronously to reduce frictional resistance. Simultaneously, as guide sleeve 304 moves upward, end cap 305 moves upward synchronously, the second spring 404 is released, synchronously driving adjusting column 402 to move upward. While achieving reset, rotating cylinder 401 moves downward relative to adjusting column 402, and guide block 4011 moves along... Figure 10The vertical arrow in the diagram moves along the trajectory, first downwards along the vertical groove 40231, and finally to the bottom of the groove 40231. The mold body 1 drives the guide sleeve 304 upwards. At this time, the external force driving the sealing plug 11 disappears, the elastic telescopic tube 7 shortens and resets, and the fluid flows along... Figure 8 The fluid flows in the opposite direction along path a, i.e., along chamber 1 (9), chamber 4 (3011), chamber 3 (3073), and chamber 2 (12) in sequence. Under fluid pressure, the sealing plug 11 moves upward. At the same time, the fourth spring 1303 is released, causing the valve ball 1302 to move inward, thus partially closing the fluid passage in the base 1301. The fluid can then flow through the flow hole 13021 with damping. At this time, the fluid moves slowly, the elastic telescopic tube 7 shortens slowly, and the slip ring 2 8 slowly returns to its original position. Since the first spring 303 has a large elastic potential energy, it can push the ball holder 302 to move upward together with the guide sleeve 304, ensuring that there are a large number of rolling balls 306 between the ball holder 302 and the guide sleeve 304.

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An injection mold, characterized in that, It includes a first mold body (1), a second mold body (2) arranged opposite to the first mold body (1), and a ball bearing guide structure (3) disposed between the first mold body (1) and the second mold body (2); Mold body one (1) and mold body two (2) can move relative to each other to achieve mold closing and mold opening; The ball guide post structure (3) includes a guide post (301) fixed on the mold body two (2), a ball frame (302) sleeved on the outside of the guide post (301) and a first spring (303), and a guide sleeve (304) sleeved on the outside of the ball frame (302) and fixed on the mold body one (1). The ball frame (302) and the first spring (303) are arranged along the axial direction of the guide post (301), and the ball frame (302) is closer to the mold body one (1) than the first spring (303). The side wall of the ball frame (302) is alternately divided into several ball areas (3021) and non-ball areas (3022) along the circumferential direction. Several balls (306) are movably embedded in the ball area (3021). The balls (306) simultaneously rub against the inner circumferential wall of the guide sleeve (304) and the circumferential side wall of the guide post (301). The guide sleeve (304) is provided with a rotation mechanism that can drive the ball frame (302) to rotate relative to the guide sleeve (304) by a preset angle when the mold body one (1) and the mold body two (2) are closed; The rotating mechanism includes a rotating cylinder (401) rotatably mounted on the end of the guide post (301) near the mold body (1), an adjusting post (402) inserted inside the rotating cylinder (401), and a connecting assembly connecting the rotating cylinder (401) and the bead holder (302). The connecting assembly can both allow the bead holder (302) to slide axially relative to the rotating cylinder (401) and allow the rotating cylinder (401) to drive the bead holder (302) to rotate synchronously. A guide block (4011) is provided on the inner wall of the rotating cylinder (401) for adjustment. The column (402) has a guide groove (4023) on its peripheral side wall, and the guide block (4011) is slidably inserted in the guide groove (4023). Under the push of the guide sleeve (304), the adjusting column (402) can slide elastically along the axis relative to the rotating cylinder (401). As the adjusting column (402) moves axially in the rotating cylinder (401), under the guidance of the guide groove (4023), the guide block (4011) drives the bead frame (302) to rotate relative to the guide sleeve (304) by a preset angle through the rotating cylinder (401) and the connecting component.

2. The injection mold according to claim 1, characterized in that, The guide groove (4023) is a ring structure and includes several groove units connected end to end. Each groove unit includes a vertical groove (40231) and an oblique groove (40232). The vertical groove (40231) extends along the axial direction of the adjusting column (402), and the oblique groove (40232) is set at an angle, with its two ends connected to the different ends of two adjacent vertical grooves (40231).

3. The injection mold according to claim 1, characterized in that, The connecting assembly includes a slide bar (4031) on the inner peripheral wall of the bead frame (302) and a notch on the outer side wall of the rotating cylinder (401). The slide bar (4031) extends along the axial direction of the bead frame (302) and is adapted to the shape of the notch, and is slidably inserted into the notch. It may include a second slide bar on the outer wall of the rotating cylinder (401) and a first slide groove on the inner circumferential wall of the bead frame (302). The second slide bar extends along the axial direction of the rotating cylinder (401), and the first slide groove extends along the axial direction of the bead frame (302). The second slide bar and the first slide groove are matched in shape and are slidably inserted into the first slide groove.

4. The injection mold according to claim 1, characterized in that, A slip ring (5) is slidably sleeved on the guide post (301), and the slip ring (5) is closer to the mold body (2) than the first spring (303); the two ends of the first spring (303) are respectively located on the bead frame (302) and the slip ring (5); a housing (307) is provided at one end of the guide post (301) near the mold body (2), and the housing (307) fixes the guide post (301) to the mold body (2); a stop assembly (6) is provided inside the housing (307) to stop the slip ring (5) on the guide post (301), and a stop assembly (6) is provided inside the guide sleeve (301) to stop the slip ring (5) on the guide post (301). 304) After moving to the preset position, the stop assembly (6) is activated / deactivated; the housing (307) is also provided with an elastic telescopic tube (7), which is sleeved on the outside of the guide post (301) and can elastically expand and contract along the axial direction; the end of the elastic telescopic tube away from the mold body two (2) is provided with a slip ring two (8), which is simultaneously sealed and slidably sleeved on the guide post (301). The slip ring two (8) can form a stop engagement with the slip ring one (5). The slip ring two (8), the elastic telescopic tube (7) and the guide post (301) are connected together. A first chamber (9) is formed by the surrounding structure; a base cylinder (10) is provided outside the elastic telescopic tube (7); a sealing plug (11) is provided outside the base cylinder (10), and the sealing plug (11) is in sealing contact with the outer wall of the base cylinder (10) and the inner wall of the shell (307), and can slide along the axial direction of the guide post (301) under the push of the guide sleeve (304); a second chamber (12) is formed by the sealing plug (11), the shell (307) and the base cylinder (10); a third chamber (3073) is formed inside the shell (307). Chamber 3 (3073) and Chamber 2 (12) are connected; a fourth chamber (3011) is formed inside the guide post (301), and the fourth chamber (3011) is connected to the third chamber (3073) and the first chamber (9); the first chamber (9), the second chamber (12), the third chamber (3073) and the fourth chamber (3011) are filled with fluid; a one-way damping component (13) is provided at the connection between the first chamber (9) and the fourth chamber (3011), which generates damping when the fluid in the first chamber (9) flows into the fourth chamber (3011).

5. The injection mold according to claim 4, characterized in that, The stop assembly (6) includes at least one stop block (601), which is capable of sliding elastically along the radial direction of the guide post (301) and has a tapered portion (6011), the tapered surface of which can form a stop engagement with the guide sleeve (304) and the slip ring (5).

6. The injection mold according to claim 4, characterized in that, The fluid is a liquid.

7. The injection mold according to claim 6, characterized in that, The liquid is hydraulic oil.

8. The injection mold according to claim 1, characterized in that, The circumferential areas covered by the ball bearing area (3021) and the non-ball bearing area (3022) are equal; the preset angle is equal to the central angle corresponding to the ball bearing area (3021).

9. The injection mold according to claim 1, characterized in that, There are multiple ball bearing guide post structures (3).

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