Cross motion multi-angle ejection mechanism of injection mold

Abstract

The utility model belongs to mould field especially, and it is a kind of cross movement multi-angle stripping mechanism of injection mould, aiming at the single stripping angle of existing injection mould, insufficient die accuracy, ejection mechanism limitation, mould maintenance difficult problem, present and propose following scheme, including mould and product main part, the mould includes injection mechanism, stripping mechanism and ejection mechanism, the stripping mechanism includes rear mould, the rear mould is equipped with installation cavity, fixed mould plate and first mounting bracket are fixed in the installation cavity, the first mounting bracket is connected sliding ejector pin by mounting seat, in the utility model, through the three-way combination of main sliding block insert, auxiliary sliding block insert and side sliding block insert, the full package forming of product tail thread end is formed, the design that inclined guide block bottom inclined section inserts rectangular hole in advance, makes main sliding block seat complete predetermined positioning in die initial stage, ensures the accurate butt joint of main sliding block insert and auxiliary sliding block insert.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a cross-motion multi-angle demolding mechanism for injection molds. Background Technology

[0002] In the field of injection molding, the demolding process for complex structural products has always been a key technical bottleneck restricting production efficiency and product quality. Traditional injection molds generally suffer from the following technical deficiencies when handling products with multi-directional undercuts, threaded structures, or complex curved surface features:

[0003] Existing molds mostly adopt a one-way linear demolding method. For irregular structures that require vertical rotation or multi-angle separation (such as the threaded end of the product tail in this application), multiple sets of sliders are required to separate them step by step, resulting in a long demolding cycle, high process complexity, and multiple mechanical actions that can easily cause scratches or deformation on the product surface.

[0004] Traditional inclined guide post driven slider mechanisms are prone to misalignment of slider inserts during mold closing due to differences in the fit clearance and motion synchronization between the guide post and the slider hole. This can lead to forming defects such as flash and burrs on the product, making them particularly unsuitable for high-precision applications such as medical and electronic components.

[0005] Conventional ejector pins are arranged in a single point or linear pattern. When facing deep cavity and thin wall structures (such as the main body of the product in this application), uneven distribution of ejection force can easily cause product warping and deformation, and ejector pin marks affect the appearance quality of the product. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing molds, which often employ a unidirectional linear demolding method. For irregularly shaped structures requiring vertical rotation or multi-angle separation (such as the threaded end of the product tail in this application), multiple sets of sliders are needed for step-by-step extraction, resulting in long demolding cycles, high process complexity, and the risk of surface scratches or deformation from repeated mechanical actions. Traditional inclined guide post driven slider mechanisms are prone to slider insert misalignment during mold closing due to differences in the fit clearance and motion synchronization between the guide post and slider hole, leading to defects such as flash and burrs, making them particularly unsuitable for high-precision applications in medical and electronic components. Conventional ejector pins are arranged in a single point or linear pattern. When dealing with deep-cavity, thin-walled structures (such as the main body of the product in this application), uneven ejection force distribution can easily cause product warping and deformation, and ejector pin marks affect the product's appearance quality. Therefore, this invention proposes a cross-motion, multi-angle demolding mechanism for injection molds.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A cross-motion multi-angle demolding mechanism for an injection mold includes a mounting plate and a first limiting side plate, a demolding mechanism, a demolding mechanism and an ejection mechanism;

[0009] The demolding mechanism includes a rear mold core, which has an installation cavity. A fixed template and a first mounting bracket are fixed in the installation cavity. The first mounting bracket is connected to a sliding ejector pin through a mounting seat. The sliding ejector pin is slidably sleeved onto a main slider seat. The main slider seat is fixedly connected to a main slider insert. Two symmetrically rotating rear mold inserts are fixedly installed on one side of the fixed template.

[0010] The first limiting side plate is fixedly installed on one side of the mounting plate. The mounting plate is fixedly installed with two symmetrically arranged auxiliary shovel bases, backhoe bases and main shovel bases. The mounting plate is also fixedly installed with four inclined guide posts and two inclined guide blocks.

[0011] An inclined guide block is fixedly provided on one side of the mounting plate. The bottom of the inclined guide block is an inclined section and the top is a vertical section. The main slider seat has a rectangular hole that mates with the inclined guide block.

[0012] When the mold is closed, the inclined section of the inclined guide block inserts into the rectangular hole to push the main slide block seat forward. The inclined guide post inserts into the circular inclined hole of the auxiliary slide block seat to drive the auxiliary slide block insert and the side slide block insert to close towards the main slide block insert. The inclined groove drives the inclined sliding insert to shrink radially through the protrusion to form the threaded cavity at the tail of the product. When demolding, the three sets of slide blocks separate synchronously through a single mold split.

[0013] In one possible design, the ejection mechanism includes a second side plate, which is slidably connected to an ejector plate via a side fixing block. The ejector plate is fixedly mounted with a plurality of ejector pins. A guide rod is fixedly connected between the second side plate and the rear mold core. The guide rod is fitted with a compression spring and slides through the ejector plate. The second side plate has a circular hole through which the piston rod of an external drive device passes.

[0014] In one possible design, the two inclined guide posts located on the same side of the backhoe base are tilted in opposite directions.

[0015] In one possible design, second mounting brackets are symmetrically provided on both sides of the mounting cavity, and auxiliary slider seats are slidably connected between the second mounting brackets on each side. The auxiliary slider seats are fixedly connected to the auxiliary slider insert and the side slider insert.

[0016] The main slider insert has a rectangular oblique hole, and two oblique sliding inserts slide through the rectangular oblique hole. The oblique sliding inserts are provided with protrusions, and the side slider inserts have oblique grooves that cooperate with the wedge shape of the protrusions.

[0017] The auxiliary slider seat has a circular oblique hole that slides with the oblique guide post. The main shovel base abuts and limits the side wall of the main slider seat. The auxiliary shovel base and the back shovel base abut and limit the side wall of the auxiliary slider seat.

[0018] In one possible design, the end of the oblique sliding insert has a threaded groove for forming the threaded end of the product.

[0019] In one possible design, a guide assembly is provided between the injection mechanism and the demolding mechanism, including a sliding inner rod fixed to the first limiting side plate and an outer sleeve fixed to the rear mold core, wherein the sliding inner rod and the outer sleeve are slidably engaged.

[0020] In one possible design, the compression spring is pre-compressed and installed between the ejector plate and the rear mold core, and the ejector pins are distributed in a matrix.

[0021] In one possible design, linear bearings are provided between the main slider seat and the sliding ejector pin, and between the auxiliary slider seat and the second mounting bracket.

[0022] In this application, during use, the injection mechanism and the demolding mechanism are first brought closer to each other to achieve the mold closing state. At this time, the sliding inner rod slides inside the outer sleeve to ensure the stability of the injection mechanism and the demolding mechanism when the mold is closed. The front mold core drives multiple auxiliary shovel bases, anti-shovel bases, inclined guide pillars, inclined guide blocks and main shovel bases to approach the demolding mechanism.

[0023] Because the inclined guide block is relatively long, the inclined part of the inclined guide block is inserted into the interior of the two rectangular holes in advance, which can push the main slider seat to slide forward on the outer wall of the sliding pin. The main slider seat drives the two main slider inserts to move forward, and one end of the two main slider inserts moves into place.

[0024] At this point, the inclined guide post begins to insert into the interior of the circular inclined hole. Simultaneously, the vertical part of the inclined guide block continues to move, but it cannot drive the main slide block to move. The main shovel base moves to one side of the main slide block to limit the main slide block. After the inclined guide post is inserted, it drives the auxiliary slide block inserts and side slide block inserts to move closer to the main slide block insert from both sides through the auxiliary slide block seats on both sides. After the two auxiliary slide block inserts are closed, the inclined groove moves to one side of the two inclined sliding inserts. The inclined groove works in conjunction with the protrusion. As the inclined groove moves, the two inclined sliding inserts move closer to each other, which can realize the forming function of the threaded end of the product body. The three-sided slide block shovel base is closed in place.

[0025] The slurry is injected into the slurry pipe through the auxiliary spatula base and finally sent to the molding position to complete the molding process. In preparation for demolding, the injection mechanism and demolding mechanism are separated again. At this time, the inclined guide post moves out of the circular inclined hole first, which can drive the two opposite auxiliary slider seats to move away from each other. At this time, the two opposite auxiliary slider inserts and the side slider inserts also move away from each other. After the inclined groove brings the protrusion out of the rectangular inclined hole, it separates from the protrusion. At this time, the inclined surface of the inclined guide block contacts the rectangular hole, which can drive the main slider insert to move backward and separate from the product body, completing the initial demolding operation.

[0026] Next, the piston rod of the electric push rod can be used to push the ejector plate to move laterally. The ejector plate drives multiple ejector pins to move laterally and squeezes the compression spring. The multiple ejector pins can push out the main body of the product, realizing the final demolding process.

[0027] Beneficial effects: This application achieves efficient and non-destructive molding and demolding of complex structure products through an innovative multi-slider collaborative drive mechanism and vertical rotation demolding structure design. The specific technical advantages are as follows:

[0028] The main slider insert, auxiliary slider insert, and side slider insert are combined in three directions to form a complete wrap-around molding of the threaded end of the product. During demolding, the cooperation between the inclined guide post and the circular inclined hole drives the auxiliary slider insert to move laterally, while the inclined guide block and the inclined surface of the rectangular hole drive the main slider insert to move longitudinally backward. The wedge-shaped transmission of the inclined groove and the protrusion realizes the radial contraction of the inclined sliding insert. The three sets of movements are completed synchronously in a single mold parting action, which improves demolding efficiency and avoids the cumulative damage to the product caused by multiple mechanical actions.

[0029] The design of the inclined section at the bottom of the inclined guide block being inserted into the rectangular hole in advance allows the main slider seat to be pre-positioned in the early stage of mold closing, ensuring the precise docking of the main slider insert and the auxiliary slider insert; its top vertical section forms a rigid limit together with the main spatula base in the later stage of mold closing, effectively offsetting the impact of injection pressure on the slider mechanism, improving mold closing accuracy, and significantly reducing the flash rate of the product.

[0030] The ejection mechanism employs a composite design of compression springs and guide rods, with the ejector pins achieving multi-stage buffered ejection under the drive of the ejector pin panel. The ejection force is optimized through the matching of spring stiffness and ejector pin distribution density, improving the uniformity of force on the product body and reducing the depth of ejection marks. This is particularly suitable for the production of optical devices or transparent parts with stringent surface quality requirements.

[0031] The design, including the linear bearing fit between the sliding ejector pin and the main slide block seat, and the dovetail groove connection between the auxiliary slide block seat and the second mounting bracket, improves maintenance efficiency and significantly reduces downtime maintenance costs compared to traditional structures.

[0032] The precise guiding fit between the sliding inner rod and the outer sleeve ensures the coaxiality of the injection mechanism and the demolding mechanism during the mold closing / opening process. Attached Figure Description

[0033] Figure 1 This is a three-dimensional structural diagram of a cross-motion multi-angle demolding mechanism for an injection mold proposed in this utility model;

[0034] Figure 2 This is a three-dimensional structural diagram of the injection mechanism and the demolding mechanism after they are separated in a cross-motion multi-angle demolding mechanism for an injection mold proposed in this utility model.

[0035] Figure 3 This is a three-dimensional structural diagram of the injection mechanism and the demolding mechanism after they are separated in a cross-motion multi-angle demolding mechanism for an injection mold proposed in this utility model.

[0036] Figure 4 Exploded view of the first limiting side plate and the front mold core in the cross-motion multi-angle demolding mechanism of an injection mold proposed in this utility model;

[0037] Figure 5 This is an exploded view of the runner plate and the sprue bushing fixing plate in the cross-motion multi-angle demolding mechanism of an injection mold proposed in this utility model.

[0038] Figure 6 An exploded view of the ejection mechanism in the cross-motion multi-angle demolding mechanism of an injection mold proposed in this utility model;

[0039] Figure 7 An exploded view of the demolding mechanism in the cross-motion multi-angle demolding mechanism of an injection mold proposed in this utility model;

[0040] Figure 8 This is a three-dimensional structural diagram of the main slider insert and the main spatula base in a cross-motion multi-angle demolding mechanism for an injection mold proposed in this utility model.

[0041] Figure 9 This is a three-dimensional structural diagram of the main slider insert and the auxiliary slider insert in a cross-motion multi-angle demolding mechanism for an injection mold proposed in this utility model.

[0042] Figure 10 An exploded view of the product body and main slider insert in a cross-motion multi-angle demolding mechanism for an injection mold proposed in this utility model;

[0043] Figure 11 This is a three-dimensional cross-sectional view of the main slider insert in a cross-motion multi-angle demolding mechanism for an injection mold proposed in this utility model.

[0044] In the diagram: 1. Injection mechanism; 101. Sealing ring; 102. First limiting side plate; 103. Sealing plate; 104. Runner plate; 105. Front mold core; 106. Auxiliary shovel base; 107. Angled guide post; 108. Back shovel base; 109. Angled guide block; 110. Main shovel base; 111. Front mold insert hole; 112. Runner cavity; 113. Injection pipe; 114. Pulling plate; 115. Sprue sleeve fixing plate; 116. Sprue sleeve body; 117. Sliding inner rod; 118. Front mold insert; 119. Mounting plate; 2. Demolding mechanism; 201. Rear mold core; 202. Outer sleeve; 203. Mounting cavity; 204. First mounting bracket; 205. Second... Mounting bracket; 206, rectangular hole; 207, main slider seat; 208, main slider insert; 209, circular oblique hole; 210, fixed template; 211, auxiliary slider seat; 212, mounting base; 213, auxiliary slider insert; 214, rear mold insert; 215, sliding ejector pin; 216, oblique groove; 217, side slider insert; 218, protrusion; 219, oblique sliding insert; 220, rectangular oblique hole; 221, threaded groove; 3. Ejection mechanism; 301, second side plate; 302, compression spring; 303, guide rod; 304, side fixing block; 305, demolding ejector pin; 306, ejector pin panel; 307, round hole; 4. Product body. Detailed Implementation

[0045] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0046] In one embodiment; reference Figure 1-11 A demolding mechanism, the specific implementation of which is as follows:

[0047] The device includes a mold and a product body 4. The mold consists of three parts: an injection mechanism 1, a demolding mechanism 2, and an ejection mechanism 3. The injection mechanism 1 and the demolding mechanism 2 achieve mold closing and positioning through the sliding engagement of the inner sliding rod 117 and the outer sleeve 202. The injection mechanism 1 includes a mounting plate 119. A front mold core 105 is fixed to the front side of the mounting plate 119. A front mold insert hole 111 is opened inside the front mold core 105, and a front mold insert 118 is installed. A runner plate 104 is provided behind the front mold core 105. A runner cavity 112 is machined inside the runner plate 104, and a sprue tube 113 is embedded therein. The sprue tube 113 passes through the front mold insert 118. A pull plate 114 and a sprue bushing fixing plate 115 are connected in sequence to the rear side of the runner plate 104. A sprue bushing body 116 is embedded in the sprue bushing fixing plate 115, forming a sprue channel with the sprue tube 113. Auxiliary shovel bases 106 and inclined guide posts 107 are symmetrically installed on both sides of the mounting plate 119. A backhoe base 108 is set in the middle. The inclined guide posts 107 on both sides of the backhoe base 108 are arranged at opposite inclinations. A sealing plate 103 is fixedly installed on one side of the mounting plate 119. A first limiting side plate 102 is fixedly installed on one side of the sealing plate 103. A sealing ring 101 is fixedly embedded on one side of the first limiting side plate 102. An inclined guide block 109 and a main shovel base 110 are fixed to the front edge of the mounting plate 119. The bottom of the inclined guide block 109 is an inclined section, and the top is a vertical section.

[0048] The main body of the demolding mechanism 2 is the rear mold core 201. An installation cavity 203 is formed inside the rear mold core 201. A fixed template 210 and a first mounting bracket 204 are fixed to the inner wall of the installation cavity 203. Rear mold inserts 214 are symmetrically installed on both sides of the fixed template 210. The first mounting bracket 204 is connected to a sliding ejector pin 215 via a mounting base 212. A main slide block seat 207 is fitted onto the outer wall of the sliding ejector pin 215. Rectangular holes 206 are formed on both sides of the main slide block seat 207, through which a main slide block insert 208 is slidably connected. A rectangular oblique hole 220 is formed at the end of the main slide block insert 208, penetrating an oblique sliding insert 219. A protrusion 218 is provided on the side of the oblique sliding insert 219, forming a wedge-shaped fit with the oblique groove 216 of the side slide block insert 217. Four sets of second mounting brackets 205 are symmetrically installed on both sides of the mounting cavity 203. Auxiliary slider seats 211 are slidably connected between the two second mounting brackets 205 on each side. A circular oblique hole 209 is opened inside the auxiliary slider seat 211, and the auxiliary slider insert 213 and the side slider insert 217 are fixed on the surface.

[0049] The ejection mechanism 3 includes a second side plate 301, which is connected to an ejector plate 306 via a side fixing block 304. Ejector pins 305 are mounted on the surface of the ejector plate 306. A guide rod 303 is provided between the second side plate 301 and the rear mold core 201. A compression spring 302 is fitted onto the outer wall of the guide rod 303, and the ejector plate 306 slides axially along the guide rod 303. A circular hole 307 is provided in the second side plate 301, allowing the piston rod of an external drive device to pass through and push the ejector plate 306.

[0050] During mold closing, the injection mechanism 1 moves toward the demolding mechanism 2. The inclined section of the inclined guide block 109 first inserts into the rectangular hole 206 of the main slide block seat 207, pushing the main slide block seat 207 forward along the sliding ejector pin 215, thus positioning the main slide block insert 208. Subsequently, the inclined guide post 107 inserts into the circular inclined hole 209 of the auxiliary slide block seat 211, driving the two auxiliary slide block seats 211 to move towards each other. The auxiliary slide block insert 213 and the side slide block insert 217 synchronously approach the main slide block insert 208. The inclined groove 216 of the side slide block insert 217 contacts the protrusion 218 of the inclined sliding insert 219. Through wedge transmission, the inclined sliding insert 219 radially contracts along the rectangular inclined hole 220. The three sets of inserts together form the molding cavity of the product tail thread. One end of the inclined sliding insert 219 has a threaded groove 221. During grouting, the grout enters the grouting pipe 113 through the sprue sleeve body 116 and is injected into the molding cavity through the front mold insert 118.

[0051] During demolding, the injection mechanism 1 retracts, and the inclined guide post 107 first disengages from the circular inclined hole 209. The auxiliary slider seat 211 slides in the opposite direction under the action of the backhoe base 108, and the auxiliary slider insert 213 separates synchronously from the side slider insert 217. After the inclined groove 216 disengages from the protrusion 218, the inclined sliding insert 219 radially resets. The vertical section of the inclined guide block 109 contacts the rectangular hole 206, causing the main slider seat 207 to retract, and the main slider insert 208 separates from the product. Finally, the piston rod of the external drive device passes through the circular hole 307 of the second side plate 301, pushing the ejector plate 306 to move along the guide rod 303. The demolding ejector pin 305 ejects the product, and the compression spring 302 provides a buffering force to prevent product deformation.

[0052] This implementation method achieves one-time demolding of multi-angle features of the product through the coordinated movement of three sets of sliders, effectively solving the problems of low efficiency and product damage caused by the step-by-step demolding of traditional molds. The staged driving mechanism of the inclined guide block 109 ensures the mold closing accuracy, the elastic buffer design of the ejection mechanism 3 reduces ejection marks, and the modular structure facilitates quick maintenance, significantly improving the molding quality and production efficiency of complex structure products.

[0053] This application can be used in the field of mold making, or in other fields applicable to this application.

[0054] In another embodiment; reference Figure 1-11 A cross-motion multi-angle demolding mechanism for injection molds is used in the mold field. Four symmetrical sliding inner rods 117 are fixedly connected to one side of the first limiting side plate 102. Four symmetrical outer sleeves 202 are fixedly installed on one side of the rear mold core 201. The four sliding inner rods 117 are slidably connected inside the four outer sleeves 202.

[0055] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A cross-motion multi-angle demolding mechanism for injection molds, characterized in that, include: Injection mechanism (1), mounting plate (119) and first limiting side plate (102), demolding mechanism (2), demolding mechanism (2) and ejection mechanism (3); The demolding mechanism (2) includes a rear mold core (201), which has an installation cavity (203). A fixed template (210) and a first mounting bracket (204) are fixed in the installation cavity (203). The first mounting bracket (204) is connected to a sliding ejector pin (215) through a mounting seat (212). The sliding ejector pin (215) is slidably sleeved on the main slider seat (207). The main slider seat (207) is fixedly connected to the main slider insert (208). Two symmetrically rotating rear mold inserts (214) are fixedly installed on one side of the fixed template (210). The first limiting side plate (102) is fixedly installed on one side of the mounting plate (119). The mounting plate (119) is fixedly installed with two symmetrically arranged auxiliary shovel bases (106), backhoe bases (108) and main shovel bases (110). The mounting plate (119) is also fixedly installed with four inclined guide posts (107) and two inclined guide blocks (109). An inclined guide block (109) is fixedly provided on one side of the mounting plate (119). The bottom of the inclined guide block (109) is an inclined section and the top is a vertical section. The main slider seat (207) has a rectangular hole (206) that cooperates with the inclined guide block (109).

2. The cross-motion multi-angle demolding mechanism for an injection mold according to claim 1, characterized in that, The ejection mechanism (3) includes a second side plate (301), which is slidably connected to the ejector plate (306) via a side fixing block (304). The ejector plate (306) is fixedly mounted with a plurality of ejector pins (305). A guide rod (303) is fixedly connected between the second side plate (301) and the rear mold core (201). The guide rod (303) is fitted with a compression spring (302) and slides through the ejector plate (306). The second side plate (301) has a circular hole (307) through which the piston rod of an external drive device passes.

3. The cross-motion multi-angle demolding mechanism for an injection mold according to claim 1, characterized in that, The two inclined guide columns (107) located on the same side of the backhoe base (108) have opposite inclination directions.

4. The cross-motion multi-angle demolding mechanism for an injection mold according to claim 3, characterized in that, The mounting cavity (203) is symmetrically provided with second mounting brackets (205) on both sides, and auxiliary slider seats (211) are slidably connected between the second mounting brackets (205) on each side. The auxiliary slider seats (211) are fixedly connected to the auxiliary slider insert (213) and the side slider insert (217). The main slider insert (208) has a rectangular oblique hole (220), and two oblique sliding inserts (219) slide through the rectangular oblique hole (220). The oblique sliding insert (219) is provided with a protrusion (218). The side slider insert (217) has an oblique groove (216) that wedges with the protrusion (218). The auxiliary slider seat (211) has a circular oblique hole (209) that slides with the oblique guide post (107). The main shovel base (110) abuts against the side wall of the main slider seat (207) and is limited. The auxiliary shovel base (106) and the back shovel base (108) abut against the side wall of the auxiliary slider seat (211) and are limited.

5. The cross-motion multi-angle demolding mechanism for an injection mold according to claim 4, characterized in that, The oblique sliding insert (219) has a threaded groove (221) at its end for forming the threaded end of the product.

6. The cross-motion multi-angle demolding mechanism for an injection mold according to claim 1, characterized in that, A guide assembly is provided between the injection mechanism (1) and the demolding mechanism (2), including a sliding inner rod (117) fixed to the first limiting side plate (102) and an outer sleeve (202) fixed to the rear mold core (201), wherein the sliding inner rod (117) and the outer sleeve (202) are slidably engaged.

7. The cross-motion multi-angle demolding mechanism for an injection mold according to claim 2, characterized in that, The compression spring (302) is pre-compressed and installed between the ejector plate (306) and the rear mold core (201), and the ejector pins (305) are distributed in a matrix.

8. The cross-motion multi-angle demolding mechanism for an injection mold according to claim 1, characterized in that, Linear bearings are provided between the main slider seat (207) and the sliding ejector pin (215), and between the auxiliary slider seat (211) and the second mounting bracket (205).

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