Precise injection mold

Abstract

The utility model discloses a precise injection mold which comprises an upper mold plate provided with an upper mold core, a lower mold plate provided with a lower mold core, a bottom base plate arranged below the lower mold plate, a first side pulling sliding block and a second side pulling sliding block, the first side pulling sliding block and the second side pulling sliding block are oppositely arranged, and the lower mold plate is connected with the bottom base plate through two supporting strips arranged at intervals. The first side pulling sliding block and the second side pulling sliding block are installed on the lower die plate in a sliding mode and can get close to or get away from each other in the horizontal direction, two sliding block shovel bases are installed on the upper die plate, a movable ejector pin plate is arranged between the two supporting strips, and a return pin spring is arranged between the ejector pin plate provided with an ejector pin and the lower die plate. A mounting through hole is formed in the upper surface of the lower mold core, and an inclined pulling sliding block is slidably mounted in the mounting through hole. According to the utility model, the sliding block can be continuously wedged and positioned in the mold-closing injection molding process, the pressure-bearing performance is stable, and the condition that the appearance of a finished product is unqualified due to the deviation of the sliding block is avoided.

Description

Technical Field

[0001] The utility model relates to a precision injection mold, belonging to the technical field of injection molds. Background Art

[0002] Headphones consist of a headphone shell, typically made of plastic. During the production process, the shell requires injection molding. Injection molds are typically adapted for thermoplastic molding. Utilizing the hot melt principle of thermoplastics, the molten plastic is injected into the mold cavity via an injection molding machine. The mold then cools and sets, and the finished product is removed from the mold. Due to the high aesthetic requirements for headphones, existing mold structures cannot meet these demands. Utility Model Content

[0003] The purpose of the utility model is to provide a precision injection mold, which can achieve continuous wedging and positioning of the slider during the mold closing and injection molding process while meeting the requirements for the precise appearance of the product after molding, and has stable pressure-bearing performance, thereby avoiding the situation where the finished product appearance is unqualified due to slider deviation.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a precision injection mold, comprising: an upper template with an upper mold core installed, a lower template with a lower mold core installed, a bottom base plate arranged below the lower template and a first side-drawing slider and a second side-drawing slider arranged opposite to each other, the lower template and the bottom base plate are connected by two support bars arranged at intervals, the first side-drawing slider and the second side-drawing slider can each be slidably installed on the lower template and can move closer to or away from each other in the horizontal direction, the upper template is equipped with two slider shovel bases corresponding to the first side-drawing slider and the second side-drawing slider, and a slider that can move in the vertical direction is horizontally arranged between the two support bars. An ejector plate, wherein at least one vertically extending return needle spring is provided between the ejector plate on which the ejector pin is installed and the lower mold plate, and the ends of the first side-drawing slider and the second side-drawing slider close to each other can be slidably embedded in the lower mold core, and a mounting through hole extending obliquely downward is provided in the upper surface of the lower mold core and in the area between the first side-drawing slider and the second side-drawing slider, and an oblique-drawing slider is slidably installed in the mounting through hole, and when in the mold closing state, a cavity for molding a product is formed between the end surface of the upper end of the oblique-drawing slider and the upper mold core, the lower mold core and the first side-drawing slider and the second side-drawing slider close to each other, and the upper end of the ejector pin can be embedded in this cavity;

[0005] The top end of the movable top plate is movable, and at least one vertically extending return spring is provided between the movable top plate and the lower template, and an inclined shovel base is installed on the movable top plate, and the upper end of the vertical portion of the inclined shovel base connected with the movable top plate at the lower end has an inclined The cam is secured to the bottom of the workbench and is designed to lock the cam face of the driver when the cam is in the unlocked position, and the cam face is secured to the bottom of the workbench and is designed to lock the cam face of the driver when the cam is in the unlocked position.

[0006] The further improved scheme in the above technical scheme is as follows:

[0007] The locking pin is secured to the underside of the cam, and the locking pin is secured on the underside of the cam, the locking pin being secured to the underside of the cam when the cam is in a locked position.

[0008] 2. In the above solution, the cross-section of the limiting groove is triangular, and the upper end of the limiting groove is configured as a pointed cone.

[0009] 3. In the above solution, the cross-sectional width of the vertical portion of the oblique shovel base that is in sliding engagement with the lower template is smaller than the cross-sectional width of the inclined portion thereof.

[0010] 4. In the above solution, when in the mold closing state, the upper end of the inclined portion of the inclined shovel base passes through an inclined guide groove that runs through from top to bottom.

[0011] 5. In the above solution, the lower mold core, the first side-drawing slider, the second side-drawing slider and the oblique-drawing slider seat are each embedded and installed in the lower accommodating groove opened on the upper surface of the lower template.

[0012] 6. In the above solution, the oblique withdrawal sliding block and the two side walls of the oblique withdrawal chute are respectively connected by a set of guide protrusions and guide grooves.

[0013] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0014] The top end of the movable sliding plate is provided with a movable bottom end and a movable bottom end is provided with a movable bottom end. The movable sliding plate is provided with a movable bottom end and a movable bottom end is provided with a movable bottom end. The movable sliding plate is provided with a movable shovel base, and the upper end of the vertical part of the inclined shovel base connected with the movable top plate has an inclined part. The inclined sliding block seat is provided with an inclined guide groove for the inclined part on the inclined guide groove, which is embedded in the inclined guide groove. The inner wall of the inclined guide groove is in sliding contact with the inclined part. The cam is secured to the bottom of the mould by a secure connection to the machine base, and the cam is secured to the bottom of the mould by a secure connection to the machine base.

[0015] 2. The precision injection mold of the utility model further comprises a limit sleeve fixedly provided under the oblique pull-out slider seat, the lower end of a vertically extending limit spring is connected to the bottom of the limit sleeve, and the upper end of the limit spring is sleeved on the outside of a limit pin. The limit pin has a second flange portion radially outward, and an inner convex portion cooperating with the second flange portion is provided above the second flange portion with the lower surface being in compression contact with the upper end surface of the limit spring and located on the inner wall of the limit sleeve. The lower surface of the oblique pull-out slider seat is provided with two limit grooves spaced along its movement direction. When the upper end surface of the second flange portion on the limit pin fits with the lower end surface of the inner convex portion on the inner wall of the limit sleeve, the upper end of the limit pin that can move in the vertical direction is embedded in any limit groove, thereby improving the position accuracy of the oblique pull-out slider during multiple opening and closing processes, thereby further improving the product yield and consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attachment Figure 1 This is a schematic diagram of the overall structure of the precision injection mold of the utility model;

[0017] Attachment Figure 2 for Figure 1 Schematic diagram of the structure cut along DD' direction;

[0018] Attachment Figure 3 for Figure 2 A partial enlarged schematic diagram of point A in the middle;

[0019] Attachment Figure 4 This is a schematic diagram of the injection molding structure of the precision injection mold of this utility model.

[0020] In the above figures: 1, upper template; 2, lower template; 3, upper mold core; 31, glue injection channel; 4, lower mold core; 41, mounting hole; 42, stop step surface; 51, first side pull-out slider; 52, second side pull-out slider; 53, positioning protrusion; 54, positioning groove; 6, slider shovel base; 7, oblique pull-out slider; 71, flange surface; 8, oblique pull-out slider seat; 81, oblique pull-out slide groove; 91, guide protrusion; 92, guide groove; 10, cavity; 11, base plate; 12, support bar; 13, ejector plate; 131, ejector; 132, return pin spring Spring; 133, return needle guide pin; 141, guide pin; 142, guide sleeve; 17, movable top plate; 171, return top spring; 172, return top guide pin; 18, oblique shovel base; 181, inclined portion; 182, vertical portion; 19, oblique guide groove; 20, ejector pin; 21, first through hole; 22, first flange portion; 23, annular groove; 24, second through hole; 25, ejection spacer; 26, limiting pin; 29, limiting sleeve; 291, inner convex portion; 30, limiting spring; 31, limiting pin; 311, second flange portion; 32, limiting groove. DETAILED DESCRIPTION

[0021] The present invention can be further understood through the following specific embodiments, but they are not intended to limit the present invention.

[0022] Example 1 A precision injection mold comprises: an upper mold plate 1 equipped with an upper mold core 3, a lower mold plate 2 equipped with a lower mold core 4, a bottom base plate 11 arranged below the lower mold plate 2, and a first side-drawing slider 51 and a second side-drawing slider 52 arranged opposite to each other. The lower mold plate 2 and the bottom base plate 11 are connected by two support bars 12 arranged at intervals. The first side-drawing slider 51 and the second side-drawing slider 52 can each be slidably installed on the lower mold plate 2 and can move closer to or away from each other in the horizontal direction. Two slider shovel bases 6 corresponding to the first side-drawing slider 51 and the second side-drawing slider 52 are installed on the upper mold plate 1. A vertically movable ejector plate 13 is horizontally arranged between the two support bars 12, and an ejector 131 is installed. At least one vertically extending return needle spring 132 is provided between the ejector plate 13 and the lower mold plate 2, and the ends of the first side-drawing slider 51 and the second side-drawing slider 52 close to each other can be slidably embedded in the lower mold core 4, and the upper surface of the lower mold core 4 and the area between the first side-drawing slider 51 and the second side-drawing slider 52 are provided with a mounting through hole 41 extending obliquely downward, and an oblique-drawing slider 7 is slidably installed in this mounting through hole 41. When in the mold closing state, the end surface of the upper end of the oblique-drawing slider 7 is inclined and forms a cavity 10 for molding the product between the upper mold core 3, the lower mold core 4 and the first side-drawing slider 51 and the second side-drawing slider 52 close to each other, and the upper end of the ejector 131 can be embedded in this cavity 10;

[0023] The lower end of the inclined pull-out slide block 7 passes through the mounting through-hole 41 and is slidably connected to an inclined pull-out slide block seat 8 that can slide in the horizontal direction. The inclined pull-out slide block seat 8 is provided with an inclined inclined pull-out slot 81 at one end near the inclined pull-out slide block 7, for the lower end of the inclined pull-out slide block 7 to be embedded in the inclined pull-out slot 81, and the end of the inclined pull-out slot 81 near the lower mold core 4 is lower than the other end. The inclined pull-out slide block 7 whose lower end surface slides in contact with the bottom surface of the inclined pull-out slot 81 is connected to the side wall of the inclined pull-out slot 81 by at least one set of guide protrusions 91 and guide grooves 92. A movable top plate 17 is horizontally provided above the ejector plate 13, and at least one vertically extending return spring 171 is provided between the movable top plate 17 and the lower mold plate 2 that can move in the vertical direction. An inclined pull-out shovel base 18 is installed on the movable top plate 17, and the upper end of the vertical portion 182 of the inclined pull-out shovel base 18 connected to the movable top plate 17 at the lower end has an inclined portion 181. The oblique withdrawal slider seat 8 is provided with an oblique guide groove 19 on the lower surface of one end of the oblique withdrawal slider 7, which is opposite to the oblique withdrawal slider 7, for the inclined portion 181 on the oblique withdrawal shovel base 18 to be embedded. The upper end of the oblique guide groove 19 whose inner wall is in sliding contact with the inclined portion 181 is inclined in the direction close to the oblique withdrawal slider 7. A ejector column 20 is installed on the lower surface of the movable ejector plate 17. The ejector plate 13 is provided with a first through hole 21 for the vertically extending ejector column 20 to pass through. The lower end of the ejector column 20 has a first flange portion 22 extending radially outward. The lower surface of the ejector plate 13 is provided with an annular groove 23 that cooperates with the first flange portion 22 and is located outside the first through hole 21. The bottom base plate 11 is provided with a second through hole 24 for the first flange portion 22 on the ejector column 20 to pass through. When in the mold closing state, a ejection gap 25 is provided between the upper surface of the first flange portion 22 and the bottom surface of the annular groove 23.

[0024] When the cam 31 is in the unlock state, the locking cam 31 is locked and the locking cam 31 is unlocked, so that the cam 31 can be unlocked and the locking cam 31 is unlocked.

[0025] The cross section of the limiting groove 32 is triangular, and the upper end of the limiting groove 32 is configured to be tapered.

[0026] The cross-sectional width of the vertical portion 182 of the oblique shovel base 18 that is in sliding engagement with the lower template 2 is smaller than the cross-sectional width of the inclined portion 181 thereof.

[0027] When in the mold closing state, the upper end of the inclined portion 181 of the inclined shovel base 18 passes through an inclined guide groove 19 that passes through the upper and lower parts.

[0028] The lower mold core 4 , the first side-drawing slider 51 , the second side-drawing slider 52 and the oblique-drawing slider seat 8 are each embedded and installed in a lower accommodating groove opened on the upper surface of the lower mold plate 2 .

[0029] The obliquely withdrawing sliding block and the two side walls of the obliquely withdrawing chute are respectively connected by a set of guide protrusions and guide grooves.

[0030] Example 2: A precision injection mold, comprising: an upper mold plate 1 equipped with an upper mold core 3, a lower mold plate 2 equipped with a lower mold core 4, a bottom base plate 11 arranged below the lower mold plate 2, and a first side-drawing slider 51 and a second side-drawing slider 52 arranged opposite to each other. The lower mold plate 2 and the bottom base plate 11 are connected by two spaced support bars 12, the first side-drawing slider 51 and the second side-drawing slider 52 are each slidably mounted on the lower mold plate 2 and can move toward or away from each other in the horizontal direction, the upper mold plate 1 is equipped with two slider shovel bases 6 corresponding to the first side-drawing slider 51 and the second side-drawing slider 52, and a vertically movable ejector plate 13 is horizontally arranged between the two support bars 12, on which an ejector 131 is installed. At least one vertically extending return needle spring 132 is provided between the ejector plate 13 and the lower mold plate 2, and the ends of the first side-drawing slider 51 and the second side-drawing slider 52 close to each other can be slidably embedded in the lower mold core 4, and the upper surface of the lower mold core 4 and the area between the first side-drawing slider 51 and the second side-drawing slider 52 are provided with a mounting through hole 41 extending obliquely downward, and an oblique-drawing slider 7 is slidably installed in this mounting through hole 41. When in the mold closing state, the end surface of the upper end of the oblique-drawing slider 7 is inclined and forms a cavity 10 for molding the product between the upper mold core 3, the lower mold core 4 and the first side-drawing slider 51 and the second side-drawing slider 52 close to each other, and the upper end of the ejector 131 can be embedded in this cavity 10;

[0031] The lower end of the inclined pull-out slide block 7 passes through the mounting through-hole 41 and is slidably connected to an inclined pull-out slide block seat 8 that can slide in the horizontal direction. The inclined pull-out slide block seat 8 is provided with an inclined inclined pull-out slot 81 at one end near the inclined pull-out slide block 7, for the lower end of the inclined pull-out slide block 7 to be embedded in the inclined pull-out slot 81, and the end of the inclined pull-out slot 81 near the lower mold core 4 is lower than the other end. The inclined pull-out slide block 7 whose lower end surface slides in contact with the bottom surface of the inclined pull-out slot 81 is connected to the side wall of the inclined pull-out slot 81 by at least one set of guide protrusions 91 and guide grooves 92. A movable top plate 17 is horizontally provided above the ejector plate 13, and at least one vertically extending return spring 171 is provided between the movable top plate 17 and the lower mold plate 2 that can move in the vertical direction. An inclined pull-out shovel base 18 is installed on the movable top plate 17, and the upper end of the vertical portion 182 of the inclined pull-out shovel base 18 connected to the movable top plate 17 at the lower end has an inclined portion 181. The oblique withdrawal slider seat 8 is provided with an oblique guide groove 19 on the lower surface of one end of the oblique withdrawal slider 7, which is opposite to the oblique withdrawal slider 7, for the inclined portion 181 on the oblique withdrawal shovel base 18 to be embedded. The upper end of the oblique guide groove 19 whose inner wall is in sliding contact with the inclined portion 181 is inclined in the direction close to the oblique withdrawal slider 7. A ejector column 20 is installed on the lower surface of the movable ejector plate 17. The ejector plate 13 is provided with a first through hole 21 for the vertically extending ejector column 20 to pass through. The lower end of the ejector column 20 has a first flange portion 22 extending radially outward. The lower surface of the ejector plate 13 is provided with an annular groove 23 that cooperates with the first flange portion 22 and is located outside the first through hole 21. The bottom base plate 11 is provided with a second through hole 24 for the first flange portion 22 on the ejector column 20 to pass through. When in the mold closing state, a ejection gap 25 is provided between the upper surface of the first flange portion 22 and the bottom surface of the annular groove 23.

[0032] When the cam 31 is in the unlock state, the locking cam 31 is locked and the locking cam 31 is unlocked, so that the cam 31 can be unlocked and the locking cam 31 is unlocked.

[0033] The cross section of the limiting groove 32 is triangular, and the upper end of the limiting groove 32 is configured to be tapered.

[0034] When in the mold closing state, the upper end of the inclined portion 181 of the inclined shovel base 18 passes through an inclined guide groove 19 that passes through the upper and lower parts.

[0035] The obliquely withdrawing sliding block and the two side walls of the obliquely withdrawing chute are respectively connected by a set of guide protrusions and guide grooves.

[0036] When in the mold closing state, the oblique pull-out slider is at the top of its stroke, the upper mold core and the lower mold core are close to each other in the vertical direction, and the first side pull-out slider and the second side pull-out slider are close to each other in the horizontal direction. Molten glue is injected into the mold cavity surrounded by the oblique pull-out slider, the upper mold core, the lower mold core, the first side pull-out slider and the second side pull-out slider through the glue injection channel to perform injection molding, cooling and molding of the product to be processed;

[0037] After the product is cooled and formed, the mold is opened;

[0038] The main process of mold opening is as follows:

[0039] First, the upper template is driven to move away from the lower template in the vertical direction. During this process, the upper mold core and the slider shovel base move with the upper template, thereby separating the upper mold core from the lower mold core to achieve demoulding. The first side pull-out slider and the second side pull-out slider are driven by the slider shovel base to move away from each other in the horizontal direction to achieve demoulding.

[0040] Next, the ejector column is driven to move upward in the vertical direction for a distance H1 until the flange on the ejector column fits into the bottom surface of the annular groove on the ejector plate. During this process, the ejector plate remains stationary, and the movable ejector plate drives the inclined shovel base to move upward under the push of the ejector column and compresses the return spring. As the inclined portion on the inclined shovel base moves upward in the inclined guide groove on the inclined slide seat, the vertical movement is converted into horizontal movement through the action of the inclined surfaces that slide with each other. The inclined shovel base pushes the inclined slide seat away from the lower mold core in the horizontal direction, and then the guide protrusion and the guide groove in the inclined slide groove cooperate with each other, and the inclined slide seat pulls the inclined slide seat to slide downward and backward in the mounting through hole on the lower mold core to achieve demoulding.

[0041] Finally, the ejector column continues to be driven to move upward in the vertical direction for a distance H2 until the upper end surface of the limit column contacts the lower surface of the lower template. During this process, the flange on the ejector column pushes the ejector plate and the movable ejector plate to move upward at the same time and compresses the return needle spring and the return spring respectively. The inclined slider seat continues to move away from the lower mold core in the horizontal direction under the push of the inclined part of the upward moving inclined shovel base. The upper end of the ejector moved up with the ejector plate penetrates into the cavity and ejects the product formed in the cavity upward, realizing the final demoulding of the product.

[0042] The mold is closed again to process and shape the next product;

[0043] The main process of mold closing is as follows:

[0044] When the upward thrust on the ejector pin is canceled, the ejector plate moves downward by a distance H2 under the action of the return spring and resets. The movable ejector plate then moves downward by a distance H2 + H1 under the action of the return spring and resets along with the downwardly moved ejector pin until an ejection gap H1 is formed between the upper surface of its upper flange and the bottom surface of the annular groove on the ejector plate.

[0045] During the downward movement of the ejector plate, the upper end of the ejector which moves downward is withdrawn from the cavity; during the downward movement of the movable ejector plate, the inclined slide seat approaches the lower die core in the horizontal direction under the reverse push of the inclined portion of the inclined shovel base, and the inclined slide slides forward and upward in the mounting through hole on the lower die core under the reverse push of the inclined slide seat until the flange surface on the inclined slide contacts the stop step surface in the mounting through hole;

[0046] The upper template is driven to move downward in the vertical direction and approach the lower template. During this process, the upper mold core and the slider shovel base move downward with the upper mold core, so that the upper mold core and the lower mold core are close to each other in the vertical direction, and the first side pull-out slider and the second side pull-out slider are driven by the slider shovel base to approach each other in the horizontal direction to achieve mold closing, and the molten glue is injected into the cavity surrounded by the oblique pull-out slider, the upper mold core, the lower mold core, the first side pull-out slider and the second side pull-out slider through the glue injection channel again, and the product to be processed is injection molded, cooled and formed.

[0047] When using the above-mentioned precision injection mold, the combination of three sets of core-pulling sliders meets the requirements for the precise appearance of the molded product. Through a simple mechanical drive structure, while effectively controlling costs, it can not only achieve stable control of the movement direction and sequence of the three core-pulling sliders during the opening and closing of the mold, but also achieve continuous wedging and positioning of the sliders during the closing and injection molding process with stable pressure-bearing performance, avoiding the situation where the finished product appearance is unqualified due to slider deviation;

[0048] Further improve the position accuracy of the oblique drawer slider during multiple mold opening and closing processes, thereby improving product yield and consistency.

[0049] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to be included in the scope of protection of the present invention.

Claims

1. A precision injection mold, comprising: An upper mold plate (1) is provided with an upper mold core (3), a lower mold plate (2) is provided with a lower mold core (4), a bottom base plate (11) is provided below the lower mold plate (2), and a first side-drawing slider (51) and a second side-drawing slider (52) are provided opposite to each other. The lower mold plate (2) and the bottom base plate (11) are connected via two spaced support bars (12). The first side-drawing slider (51) and the second side-drawing slider (52) are each slidably provided on the lower mold plate (2) and can move closer to or farther from each other in the horizontal direction. Two slider shovel bases (6) corresponding to the first side-drawing slider (51) and the second side-drawing slider (52) are provided on the upper mold plate (1). A vertically movable ejector plate (13) is provided horizontally between the two support bars (12). The ejector plate (13) is provided with an ejector pin (131). At least one vertically extending return needle spring (132) is provided between the lower mold plate (2), and is characterized in that: the ends of the first side-drawing slider (51) and the second side-drawing slider (52) that are close to each other can be slidably embedded in the lower mold core (4), and a mounting through hole (41) that is inclined and extends downward is provided in the upper surface of the lower mold core (4) and the area between the first side-drawing slider (51) and the second side-drawing slider (52), and an inclined drawing slider (7) can be slidably installed in the mounting through hole (41). When in the mold closing state, the end surface of the upper end of the inclined drawing slider (7) and the upper mold core (3), the lower mold core (4) and the first side-drawing slider (51) and the second side-drawing slider (52) that are close to each other form a cavity (10) for molding a product, and the upper end of the ejector pin (131) can be embedded in this cavity (10); The lower end of the inclined pull-out slider (7) passes through the mounting through hole (41) and is slidably connected to an inclined pull-out slider seat (8) that can slide in the horizontal direction. The inclined pull-out slider seat (8) is provided with an inclined inclined pull-out groove (81) at one end close to the inclined pull-out slider (7). The inclined pull-out groove (81) for the lower end of the inclined pull-out slider (7) to be embedded is lower than the other end at one end close to the lower mold core (4). The inclined pull-out slider (7) whose lower end surface is in sliding contact with the bottom surface of the inclined pull-out groove (81) and the side wall of the inclined pull-out groove (81) pass through to At least one set of guide protrusions (91) is connected to the guide grooves (92), a movable top plate (17) is horizontally arranged above the ejector plate (13), at least one vertically extending return spring (171) is arranged between the movable top plate (17) that can move in the vertical direction and the lower template (2), an inclined shovel base (18) is installed on the movable top plate (17), and the upper end of the vertical portion (182) of the inclined shovel base (18) connected to the movable top plate (17) at the lower end has an inclined portion (181), the The inclined guide groove (19) is provided on the lower surface of the inclined slide block seat (8) opposite to one end of the inclined slide block (7) for the inclined portion (181) on the inclined shovel base (18) to be embedded. The upper end of the inclined guide groove (19) whose inner wall is in sliding contact with the inclined portion (181) is inclined toward the direction of approaching the inclined slide block (7). A ejection column (20) is installed on the lower surface of the movable top plate (17). The ejector plate (13) is provided with a first through hole (21) for the vertically extending ejection column (20) to pass through. The ejection column ( The lower end of the ejector pin (20) has a first flange portion (22) extending radially outward, the lower surface of the ejector pin plate (13) is provided with an annular groove (23) cooperating with the first flange portion (22) and located outside the first through hole (21), and the base plate (11) is provided with a second through hole (24) for the first flange portion (22) on the ejector pin (20) to pass through, and when in the mold closing state, an ejection gap (25) is provided between the upper surface of the first flange portion (22) and the bottom surface of the annular groove (23).

2. The precision injection mold according to claim 1, characterized in that: A limiting sleeve (29) is installed on the lower template (2) and below the inclined sliding block seat (8). The lower end of a vertically extending limiting spring (30) is connected to the bottom of the limiting sleeve (29). The upper end of the limiting spring (30) is sleeved on the outside of a limiting pin (31). The limiting pin (31) has a second flange portion (311) extending radially outward. The lower surface of the second flange portion (311) is in compression contact with the upper end surface of the limiting spring (30) and is located above the limiting pin (31). An inner convex portion (291) is provided on the inner wall of the positioning sleeve (29) and is matched with the second flange portion (311). The lower surface of the inclined sliding block seat (8) is provided with two limiting grooves (32) spaced apart along the direction of movement thereof. When the upper end surface of the second flange portion (311) on the limiting pin (31) is fitted with the lower end surface of the inner convex portion (291) on the inner wall of the limiting sleeve (29), the upper end of the limiting pin (31) which can move in the vertical direction is embedded in any one of the limiting grooves (32).

3. The precision injection mold according to claim 2, characterized in that: The cross section of the limiting groove (32) is triangular, and the upper end of the limiting groove (32) is configured as a pointed cone.

4. The precision injection mold according to claim 1, characterized in that: The cross-sectional width of the vertical portion (182) of the oblique shovel base (18) that is in sliding engagement with the lower template (2) is smaller than the cross-sectional width of the inclined portion (181) thereof.

5. The precision injection mold according to claim 1 or 2, characterized in that: When in the mold closing state, the upper end of the inclined portion (181) of the inclined shovel base (18) passes through an inclined guide groove (19) that passes through the upper and lower parts.

6. The precision injection mold according to claim 1, characterized in that: The lower mold core (4), the first side-drawing slider (51), the second side-drawing slider (52) and the oblique-drawing slider seat (8) are each embedded and installed in a lower accommodating groove opened on the upper surface of the lower mold plate (2).

7. The precision injection mold according to claim 1, characterized in that: The oblique withdrawal slide block (7) and the two side walls of the oblique withdrawal chute (81) are respectively connected by a set of guide protrusions (91) and guide grooves (92).

Images