Precision plastic mold frame with floating core calibration mechanism
By combining a floating core calibration mechanism and magnetic patches, precise positioning of the mold base and cleaning of the core before mold closing are achieved, solving the problems of core misalignment and impurities, and improving the molding accuracy and automation of injection molded parts.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- WENZHOU JUFENG MOLD
- Filing Date
- 2026-05-18
- Publication Date
- 2026-07-14
AI Technical Summary
Existing precision plastic mold frames cannot achieve dynamic calibration of the core position before mold closing, resulting in misalignment between the core and the core cavity, affecting the forming accuracy of the workpiece, and cannot effectively remove impurities from the core surface, affecting the fitting accuracy.
A floating core calibration mechanism is adopted, which uses the combination of floating airbags and magnetic patches to achieve precise positioning of the mold frame before mold closing, and achieves dynamic calibration of the core through the magnetic attraction of compressed gas, while cleaning the core through the air outlet.
It achieves precise alignment of the mold base before mold closing, ensures high-precision matching between the core and the core cavity, automates the cleaning of the core, improves the molding quality of injection molded parts, and reduces the structural complexity and operating cost of the mold base.
Smart Images
Figure CN122185502B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of mold injection technology, specifically to a precision plastic mold base with a floating core calibration mechanism. Background Technology
[0002] Precision plastic mold sets are used for injection molding of plastic workpieces. The alignment accuracy between the core and the core cavity directly determines the molding accuracy of the workpiece. During the mold closing process, the upper and lower mold sets are prone to positional misalignment due to factors such as installation errors, mold closing impact forces, and component wear. This can lead to core and core cavity misalignment, resulting in defects such as out-of-tolerance dimensions, flash, and material shortages in the workpiece. Existing mold sets mostly rely on rigid structures such as insert shafts and center shafts for initial positioning, which cannot dynamically calibrate the core position before mold closing, making it difficult to meet the molding requirements of high-precision workpieces.
[0003] According to the public authorization number CN105108976B, the injection mold for the angular contact engineering plastic cage of the precision bearing adjusts the shape structure of the core by means of the structural design of the fixed mold pocket core and the moving mold pocket core, thereby reducing the difficulty of mold processing and improving the fitting accuracy between the core and the cavity.
[0004] According to the public authorization number CN109016382B, this spring-reset plastic molding die with support group force deformation and top shrinkage ejection adjusts the core force state during demolding to ensure the positional stability of the workpiece during demolding.
[0005] According to the public authorization number CN120886428B, the lightweight structure injection molding equipment for notebook shells uses an air-assisted ejector pin assembly to apply a uniform ejection force to the workpiece during demolding, thereby avoiding deformation of the workpiece due to uneven force and indirectly ensuring the fitting accuracy between the core and the cavity.
[0006] However, the above-mentioned technical solutions only optimize the fit between the core and the cavity from the dimensions of mold processing, demolding force, and ejection structure. They do not actively calibrate the core position before mold closing, which cannot solve the problem of core misalignment caused by mold frame position shift during mold closing. Furthermore, they cannot complete the core cleaning operation before mold closing, and residual material impurities will affect the fit accuracy between the core and the cavity, failing to meet the dynamic calibration of precision plastic mold frame before mold closing. Summary of the Invention
[0007] The purpose of this invention is to provide a precision plastic mold frame with a floating core calibration mechanism to solve the problems mentioned in the background art.
[0008] To achieve the above objectives, the present invention provides the following technical solution: a precision plastic mold frame with a floating core calibration mechanism, comprising an upper mold frame and a lower mold frame, wherein core bodies are provided on both sides of the top of the lower mold frame, and a calibration mechanism is provided in the middle of the top of the lower mold frame, the calibration mechanism comprising a lower mold core groove, the lower mold core groove being symmetrically opened on the left and right sides in the middle of the top of the lower mold frame;
[0009] Four insert shafts are vertically arranged around the outer perimeter of the upper mold frame. A central hole is provided in the middle of the upper mold frame. A central merging shaft is vertically arranged inside the central hole. Core cavities are opened on both sides of the surface of the upper mold frame. The core cavities are aligned with the core body. An embedded protrusion is provided inside the core cavity. A flow channel is opened on the side of the core cavity near the middle of the upper mold frame. An auxiliary mechanism is provided on the outside of the flow channel near the middle of the upper mold frame. The auxiliary mechanism includes a blocking plate, which is located inside the flow channel.
[0010] A feed pipe is provided at one end of the upper mold frame and the lower mold frame. An external hole is provided on the outside of the feed pipe. A splitting mechanism is provided on the surface of the upper mold frame and the lower mold frame parallel to the external hole. The splitting mechanism includes positioning and merging holes, which are symmetrically opened on the surface of the upper mold frame.
[0011] Preferably, the calibration mechanism further includes a floating airbag, an air inlet pipe, an upper sealing plate, a lower sealing plate, an axis door plate, a sliding sleeve, a connecting rod, a central tube, a first spring, a positioning foot, a crank rod, a first side rotating shaft, a flip-over plug, a third spring, a second side rotating shaft, an upper slot, a side rectangular slot, a lower displacement block, a fourth spring, and an embedded shaft. A lower sealing plate is provided inside the lower mold core slot, and a rectangular cavity is provided inside the lower sealing plate. The top of this rectangular cavity is covered by the floating airbag. An air outlet and a pressure valve are provided on the side of the floating airbag near the core body. An axis door plate is rotatably mounted on one end of the rectangular cavity side of the lower sealing plate. A first side rotating shaft is provided at the upper ends of both sides of the axis door plate. A crank rod is provided at the lower end of the back of the first side rotating shaft. A flip-over plug is provided on the back of the crank rod. The flip-over plug has two sides... A second lateral rotating shaft is provided. A central tube is provided outside the flip-over plug. A third spring is connected between the back of the flip-over plug and the front end of the inner side of the central tube. A positioning foot is provided at the front end of the outer side of the central tube. A sliding sleeve is sleeved in the middle of the outer side of the central tube. A connecting rod is provided at the end of the sliding sleeve near the air bladder. A first spring is provided on the back of the connecting rod. The air inlet pipe is located on the central axis of the central tube. The upper slot is symmetrically opened in the middle of the surface of the upper mold frame. Two lateral rectangular slots are opened at both ends of the inner side of the upper slot. An embedded shaft is vertically arranged inside the lateral rectangular slot. A lower displacement block is sleeved outside the embedded shaft. A fourth spring is provided at the bottom of the lower displacement block. An upper sealing plate is provided at the top of the lower displacement block. Flexible magnetic patches are symmetrically arranged at both ends of the top of the upper sealing plate.
[0012] Preferably, the inner surface of the buoyancy airbag is provided with a magnetic powder layer with magnetic properties opposite to those of the flexible magnetic patch, and the outer edge of the buoyancy airbag is flush with the outer edge of the flexible magnetic patch.
[0013] Preferably, the connecting rod and the lower sealing plate are fixedly connected, and the moving direction of the connecting rod is the same as the moving direction of the sliding sleeve outside the central tube.
[0014] Preferably, the first lateral rotating shaft and the inner side of the lower sealing sheet form a rotating structure, and the second lateral rotating shaft and the central tube form a rotating structure.
[0015] Preferably, the auxiliary mechanism further includes a lower pressure plate, wherein the lower pressure plate is provided on the side of the top of the blocking plate near the middle of the upper mold frame, and the edge of the lower pressure plate is parallel to the edge of the bottom side of the upper sealing plate.
[0016] Preferably, the overall structure of the blocking piece is the same as the structure of the inner side of the drainage channel, and the blocking piece and the inner side of the drainage channel form a rotating structure.
[0017] Preferably, the splitting mechanism further includes a sealing plug, a shifting rod, an embedded slide rail, a positioning strip, a sliding piece, a second spring, an anti-detachment ring, an adhesive strip, a pin, and an adhesive block. A pin is provided on the outer side of the positioning and merging hole, and an adhesive strip is provided on the back of the pin. A shifting rod is provided on one side of the surface of the adhesive strip. A sealing plug is provided at the connection between the shifting rod and the upper mold frame. Embedded slide rails are provided on both sides of the shifting rod. An anti-detachment ring is sleeved on the front end of the shifting rod. A positioning strip is provided in the middle of the shifting rod. A sliding piece is provided at the end of the shifting rod near the inner side of the upper mold frame. A second spring is provided between the positioning strip and the sliding piece. An adhesive block is provided at the tail end of the shifting rod.
[0018] Preferably, the two sides of the slider and the inner side of the embedded slide rail form a sliding structure, and the positioning strip is fixedly connected to the embedded slide rail.
[0019] Preferably, one end of the displacement rod is fixedly connected to the adhesive block, the adhesive block is fixedly connected to one end of the lower sealing sheet, and the moving direction of the displacement rod is the same as the moving direction of the lower sealing sheet.
[0020] Compared with the prior art, the beneficial effects of the present invention are:
[0021] The calibration mechanism introduces compressed gas through the inlet pipe, which is then transmitted via the central pipe and flip-over plug to the space between the lower sealing plate and the floating air bladder. After the floating air bladder inflates, the magnetic attraction between the magnetic powder layer and the flexible magnetic patch aligns the upper and lower mold frames, achieving precise positioning before mold closing. Simultaneously, when the air pressure inside the floating air bladder reaches a critical value, gas is ejected through the outlet into the core, rinsing the exterior of the core. Various springs and rotating shafts work together to achieve automatic component reset, requiring no additional operation and ensuring the calibration mechanism can operate repeatedly, adapting to the continuous use requirements of the mold frame.
[0022] The auxiliary mechanism's blocking plate matches the structure of the drainage channel, maintaining its upright position and blocking the passage within the channel. This prevents liquid material from flowing into the core cavity from the feed pipe during mold frame calibration, thus preventing material waste and contamination of the mold frame. When the upper sealing plate falls back, it squeezes the lower pressure plate, causing the blocking plate to flip and open the drainage channel, enabling normal material delivery to the core cavity. The lower pressure plate and the upper sealing plate have parallel edges, ensuring effective transmission of extrusion pressure. The rotating structure of the blocking plate ensures smooth operation, achieving automatic switching between open and closed drainage channels, and forming a linkage with the calibration mechanism.
[0023] The splitting mechanism is connected to the lower sealing plate of the calibration mechanism via an adhesive block. When the lower sealing plate moves, it drives the shifting rod to slide along the embedded slide rail, thereby moving the pin out of the positioning and merging hole, achieving automatic separation of the upper and lower mold frames. After the compressed gas dissipates, the second spring drives the shifting rod to reset, and the pin re-inserts into the positioning and merging hole, completing the merging and locking of the mold frames. The sealing plug seals the connection gap between the shifting rod and the upper mold frame, and the anti-detachment ring limits the stroke of the shifting rod. The entire structure requires no additional power and, in conjunction with the calibration mechanism, achieves automated operation of mold frame splitting and locking. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the overall axial appearance structure of the present invention;
[0025] Figure 2 This is a schematic diagram of the layout structure of the core components of the upper mold frame of the present invention;
[0026] Figure 3 This is a schematic diagram of the rotating feeding assembly in this invention;
[0027] Figure 4 This is a diagram showing the mating of the lower mold core and the calibration mechanism of the present invention.
[0028] Figure 5 This is a schematic diagram of the alignment structure between the lower mold frame core groove and the core of the present invention;
[0029] Figure 6 for Figure 5 An enlarged structural diagram at point A;
[0030] Figure 7 for Figure 5 Enlarged structural diagram at point B;
[0031] Figure 8 This is a diagram showing the linkage structure between the splitting mechanism and the lower sealing sheet of the present invention;
[0032] Figure 9 for Figure 8 Enlarged structural diagram at point C;
[0033] Figure 10 This is an assembly diagram of the splitting mechanism displacement rod and sealing plug of the present invention;
[0034] Figure 11 for Figure 10 Enlarged structural diagram at point D;
[0035] Figure 12 This is a side view of the upper mold core cavity and the drainage groove of the present invention;
[0036] Figure 13 This is a structural diagram of the upper mold frame upper slot and side rectangular slot of the present invention;
[0037] Figure 14 This is an installation diagram of the flexible magnetic patch and the upper sealing sheet of the present invention;
[0038] Figure 15 for Figure 14 Enlarged structural diagram at point E;
[0039] Figure 16 This is an enlarged schematic diagram of the blocking plate;
[0040] Figure 17 This is a schematic diagram of the external structure of the center tube;
[0041] Figure 18 for Figure 17 A schematic diagram of the structure of F.
[0042] In the diagram: 1. Upper mold frame; 2. Core body; 3. Insert shaft; 4. Lower mold frame; 5. Floating air bladder; 6. Lower mold core groove; 7. Air inlet pipe; 8. Positioning and merging hole; 9. Flexible magnetic patch; 10. Feed pipe; 11. Upper sealing plate; 12. Core cavity; 13. Lower sealing plate; 14. Axis door plate; 15. Sliding sleeve; 16. Connecting rod; 17. Central tube; 18. First spring; 19. Positioning foot; 20. Sealing plug; 21. Shifting rod; 22. Embedded slide rail; 23. Positioning strip; 24. Sliding... 25. Second spring; 26. Anti-detachment ring; 27. Adhesive strip; 28. Pin; 29. Adhesive block; 30. Crank rod; 31. First side pivot; 32. Flip plug; 33. Third spring; 34. Second side pivot; 35. Embedded protrusion; 36. Central merging shaft; 37. Drainage groove; 38. Central hole; 39. External hole; 40. Upper groove; 41. Side rectangular groove; 42. Lower displacement block; 43. Fourth spring; 44. Embedded shaft; 45. Blocking piece; 46. Lower pressure piece. Detailed Implementation
[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0044] Please see Figures 1-18 The present invention provides a precision plastic mold frame with a floating core calibration mechanism: a precision plastic mold frame with a floating core calibration mechanism includes an upper mold frame 1 and a lower mold frame 4. Core bodies 2 are provided on both sides of the top of the lower mold frame 4, and a calibration mechanism is provided in the middle of the top of the lower mold frame 4. The calibration mechanism includes a lower mold core groove 6, which is symmetrically opened on the left and right sides in the middle of the top of the lower mold frame 4.
[0045] Four insert shafts 3 are vertically arranged around the outer perimeter of the upper mold frame 1. A central hole 38 is provided in the middle of the upper mold frame 1. A central merging shaft 36 is vertically arranged inside the central hole 38. Core cavities 12 are opened on both sides of the surface of the upper mold frame 1. The core cavities 12 are aligned with the core body 2. An embedded protrusion 35 is provided inside the core cavity 12. A flow channel 37 is opened on the side of the core cavity 12 near the middle of the upper mold frame 1. An auxiliary mechanism is provided on the side of the flow channel 37 near the middle of the upper mold frame 1. The auxiliary mechanism includes a blocking piece 45, which is located inside the flow channel 37.
[0046] A feed pipe 10 is provided at one end of the upper mold frame 1 and the lower mold frame 4. An external hole 39 is provided on the outside of the feed pipe 10. A splitting mechanism is provided on the surface of the upper mold frame 1 and the lower mold frame 4 parallel to the external hole 39. The splitting mechanism includes a positioning and merging hole 8, which is symmetrically opened on the surface of the upper mold frame 1.
[0047] Please see Figures 1-16The calibration mechanism also includes a floating airbag 5, an air inlet pipe 7, an upper sealing plate 11, a lower sealing plate 13, an axis door plate 14, a sliding sleeve 15, a connecting rod 16, a central tube 17, a first spring 18, a positioning foot 19, a crank 30, a first side rotating shaft 31, a flip plug 32, a third spring 33, a second side rotating shaft 34, an upper slot 40, a side rectangular slot 41, a lower displacement block 42, a fourth spring 43, and an embedded shaft 44. The inner side of the lower mold core slot 6 is provided with a lower... A sealing sheet 13 is placed, and a rectangular cavity is provided inside the lower sealing sheet 13. The top of the rectangular cavity is covered by a floating air bladder 5. The floating air bladder 5 has an air outlet and a pressure valve on the side near the core body 2. An axis door 14 is rotatably provided at one end of the rectangular cavity side of the lower sealing sheet 13. The upper ends of both sides of the axis door 14 are provided with first lateral rotating shafts 31. The lower end of the back of the first lateral rotating shafts 31 is provided with a crank 30. The back of the crank 30 is provided with a flip plug 32. The plug 32 has second lateral pivots 34 on both sides. A central tube 17 is provided on the outside of the flip plug 32. A third spring 33 is connected between the back of the flip plug 32 and the front end of the inner side of the central tube 17. A positioning foot 19 is provided at the front end of the outside of the central tube 17. A sliding sleeve 15 is sleeved in the middle of the outside of the central tube 17. A connecting rod 16 is provided at the end of the sliding sleeve 15 near the air bladder 5. A first spring 18 is provided on the back of the connecting rod 16. The air inlet pipe 7 is located within the central tube 17. On the central axis, the upper slot 40 is symmetrically opened at the middle of the surface of the upper mold frame 1. Two side rectangular slots 41 are opened at both ends of the inner side of the upper slot 40. An embedded shaft 44 is vertically arranged inside the side rectangular slot 41. A lower displacement block 42 is sleeved on the outside of the embedded shaft 44. A fourth spring 43 is arranged at the bottom of the lower displacement block 42. An upper sealing plate 11 is arranged at the top of the lower displacement block 42. Flexible magnetic patches 9 are symmetrically arranged at both ends of the top of the upper sealing plate 11.
[0048] The components work together to form the core transmission and positioning structure of the calibration mechanism. The lower mold core groove 6 provides the installation foundation for the calibration mechanism, the air inlet pipe 7 provides the delivery channel for compressed gas, the floating airbag 5 achieves magnetic positioning through gas expansion, and various rotating shafts, rods, and springs realize the transmission of force and component reset. The upper sealing plate 11 and the flexible magnetic patch 9 cooperate to achieve the magnetic alignment of the upper mold frame 1 and the lower mold frame 4. The overall structure achieves precise position calibration of the mold frame before mold closing, and also has the auxiliary function of cleaning the core body 2. The floating airbag 5 can receive the compressed gas introduced into the rectangular cavity of the lower sealing plate 13 and expand. The magnetic powder layer on the inner side of the surface layer and the flexible magnetic patch 9 of the upper sealing plate 11 generate a magnetic attraction. When the expansion reaches the critical value, the pressure valve on one side opens and the compressed gas is ejected through the air outlet. The purpose is to drive the upper mold frame 1 and the lower mold frame 4 to align through magnetic attraction, and at the same time use the ejected compressed gas to clean the outside of the core body 2.
[0049] Please see Figures 1-18The inner surface of the buoyancy bag 5 is provided with a magnetic powder layer with magnetic properties opposite to those of the flexible magnetic patch 9, and the outer edge of the buoyancy bag 5 is flush with the outer edge of the flexible magnetic patch 9.
[0050] Among them, the heterogeneous magnetic powder layer on the inner side of the surface of the airbag 5 and the flexible magnetic patch 9 form a magnetic attraction, which provides an adsorption force for the position correction of the upper mold frame 1. The flush setting of the two maximizes the contact area during adsorption, ensures the uniform transmission of magnetic attraction force, avoids calibration deviation caused by contact misalignment, and ensures the alignment accuracy of the upper mold frame 1 and the lower mold frame 4.
[0051] Please see Figures 1-16 The connecting rod 16 and the lower sealing plate 13 are fixedly connected, and the moving direction of the connecting rod 16 is the same as the moving direction of the sliding sleeve 15 outside the central tube 17.
[0052] The fixed connection structure between the connecting rod 16 and the lower sealing plate 13 allows the moving power of the lower sealing plate 13 to be directly transmitted to the connecting rod 16. The synchronous movement direction of the two ensures that the sliding sleeve 15 moves linearly along the central tube 17 with the connecting rod 16, realizing the directional transmission of force and avoiding component jamming caused by connection or movement direction deviation, thus ensuring the smooth power transmission of the calibration mechanism.
[0053] Please see Figures 1-18 The first side rotating shaft 31 and the inner side of the lower sealing plate 13 form a rotating structure, and the second side rotating shaft 34 and the central tube 17 form a rotating structure.
[0054] The rotating structures of the first side rotating shaft 31 and the lower sealing plate 13, and the second side rotating shaft 34 and the central tube 17 provide support for the flipping action of the axis door plate 14 and the flipping plug 32, respectively, so that the two can rotate around the rotating shaft under the action of external force to complete the on / off control of the compressed gas channel. At the same time, the cooperation between the rotating shaft and the corresponding component limits the trajectory and angle of the flipping, ensuring the standardization and consistency of the mechanism's action.
[0055] Please see Figures 1-18 The auxiliary mechanism also includes a lower pressure plate 46. The lower pressure plate 46 is provided on one side of the top of the blocking plate 45 near the middle of the upper mold frame 1. The edge of the lower pressure plate 46 is parallel to the edge of the bottom side of the upper sealing plate 11.
[0056] The lower pressure plate 46 provides a force transmission medium between the upper sealing plate 11 and the blocking plate 45. The parallel arrangement of their edges allows the upper sealing plate 11 to precisely squeeze the lower pressure plate 46 when it moves back, ensuring the effective action of the squeezing force. This, in turn, drives the blocking plate 45 to complete the flipping action, thereby realizing the auxiliary mechanism's control over the opening and closing of the drainage groove 37.
[0057] Please see Figures 1-18The overall structure of the blocking piece 45 is the same as the inner structure of the drainage channel 37, and the blocking piece 45 and the inner side of the drainage channel 37 form a rotating structure.
[0058] The structure of the blocking plate 45 and the flow channel 37 is such that the blocking plate 45 can completely block the flow channel 37 when it is upright, preventing liquid material from flowing into the core cavity 12 in advance. The rotating structure of the two allows the blocking plate 45 to be flipped under the action of external force, so as to open the passage of the flow channel 37, meet the material conveying requirements after the mold frame is calibrated, and ensure the reliability of the sealing and flow function switching of the auxiliary mechanism.
[0059] Please see Figures 1-18 The splitting mechanism also includes a sealing plug 20, a shifting rod 21, an embedded slide rail 22, a positioning strip 23, a sliding piece 24, a second spring 25, an anti-detachment ring 26, an adhesive strip 27, a pin 28, and an adhesive block 29. A pin 28 is provided on the outside of the positioning and merging hole 8. An adhesive strip 27 is provided on the back of the pin 28. A shifting rod 21 is provided on one side of the surface of the adhesive strip 27. A sealing plug 20 is provided at the connection between the shifting rod 21 and the upper mold frame 1. An embedded slide rail 22 is provided on both sides of the shifting rod 21. An anti-detachment ring 26 is sleeved on the front end of the shifting rod 21. A positioning strip 23 is provided in the middle of the shifting rod 21. A sliding piece 24 is provided at the end of the shifting rod 21 near the inside of the upper mold frame 1. A second spring 25 is provided between the positioning strip 23 and the sliding piece 24. An adhesive block 29 is provided at the tail end of the shifting rod 21.
[0060] The components work together to form a mold frame splitting and merging locking structure. The adhesive block 29 realizes the power linkage between the splitting mechanism and the calibration mechanism. The displacement rod 21, the embedded slide rail 22, and the slide plate 24 realize the directional transmission of force. The second spring 25 realizes the component reset. The pin 28 cooperates with the positioning and merging hole 8 to realize the locking of the mold frame. The sealing plug 20 ensures the sealing of the connection part. The anti-detachment ring 26 limits the movement stroke of the component. The overall structure realizes the automatic splitting and merging locking of the mold frame as the calibration mechanism moves.
[0061] Please see Figures 1-18 The two sides of the slider 24 and the inner side of the embedded slide rail 22 form a sliding structure, and the positioning strip 23 is fixedly connected to the embedded slide rail 22.
[0062] The sliding structure of the slider 24 and the embedded slide rail 22 allows the slider 24 to move linearly along the embedded slide rail 22, providing guidance and support for the movement of the displacement rod 21 and preventing the displacement rod 21 from deviating during movement. The fixed connection between the positioning strip 23 and the embedded slide rail 22 provides a fixed support point for the second spring 25, ensuring that the second spring 25 can achieve effective elastic deformation when the slider 24 moves, providing power for the reset of the displacement rod 21.
[0063] Please see Figures 1-18One end of the shifting rod 21 is fixedly connected to the adhesive block 29, and the adhesive block 29 is fixedly connected to one end of the lower sealing sheet 13. The moving direction of the shifting rod 21 is the same as the moving direction of the lower sealing sheet 13.
[0064] The double-layer fixed connection between the displacement rod 21 and the adhesive block 29, and between the adhesive block 29 and the lower sealing plate 13, enables the rigid power linkage between the calibration mechanism and the splitting mechanism. This allows the movement of the lower sealing plate 13 to directly drive the displacement rod 21 to move synchronously. The synchronous movement of the two ensures the directional transmission of force, realizing the automatic linkage action of the splitting mechanism during the mold frame calibration process without the need for additional power drive, thus improving the automated operation effect of the mold frame.
[0065] Working principle: When in use, the feed pipe 10 is connected to the inner side of the upper mold frame 1 and the lower mold frame 4 through the external hole 39. When the upper mold frame 1 and the lower mold frame 4 are combined, the insertion shaft 3 at the bottom of the upper mold frame 1 is inserted into the corresponding position on the surface of the lower mold frame 4, and the central merging shaft 36 inside the central hole 38 is aligned with the middle of the top of the lower mold frame 4.
[0066] The feed pipe 10 introduces the external liquid material between the core body 2 and the core cavity 12. The embedded protrusion 35 on the inner side of the core cavity 12 forms a hole on the inner side of the workpiece formed between the core body 2 and the core cavity 12.
[0067] Before introducing liquid material into the feed pipe 10, the lower mold frame 4 and the upper mold frame 1 need to be aligned and calibrated. External compressed gas is introduced into the lower mold frame 4 through the air inlet pipe 7. After being discharged from the air inlet pipe 7, the compressed gas enters the inner side of the central tube 17 along the axis and flows to the back of the flip-over plug 32. The flow rate and pressure of the compressed gas push the flip-over plug 32. The flip-over plug 32 is driven by force to rotate the second side rotating shaft 34 inside the central tube 17. The third spring 33 drives the flip-over plug 32 to reset after it loses the thrust of the compressed gas.
[0068] Compressed gas serves as a purely mechanical power source, requiring no additional electricity or high-energy-consumption drive, thus reducing the operating cost of the mold frame. The rotating flip-over plug 32 is driven by air pressure to rotate, which is used to open the delivery path of compressed gas to the floating air bladder 5, providing power for subsequent mold frame calibration. The reset function of the third spring 33 can automatically drive the flip-over plug 32 to reset and close the air passage after a single calibration operation is completed and the compressed gas input stops, reserving the initial state for the next mold closing calibration operation, realizing the continuous cyclic operation of the mold frame, and adapting to the batch operation requirements of injection molding production.
[0069] When the flip-over plug 32 flips forward, it drives the crank 30 to press forward. The crank 30 drives the axis door 14 to flip inside the lower sealing plate 13. The first lateral rotating shaft 31 assists the axis door 14 in rotating inside the lower sealing plate 13. The first lateral rotating shaft 31 is located at the upper ends of both sides of the axis door 14, and the main force-bearing surface of the axis door 14 is located below it. The axis door 14 needs to be subjected to a certain impact force when flipping. The impact force of the compressed gas is partially blocked by the axis door 14, and the impact force of the compressed gas entering the lower sealing plate 13 through the axis door 14 is reduced.
[0070] Among them, the buffer function of the axis door plate 14 can prevent the high-pressure compressed gas from directly impacting the floating air bag 5, causing it to over-expand, deform and fail. At the same time, it controls the expansion rate of the floating air bag 5, ensuring that the magnetic positioning process is stable and controllable, preventing the mold frame from being impacted and causing secondary displacement. This solves the problem of insufficient positioning accuracy caused by the direct action of high-pressure gas and improves the stability of mold frame calibration.
[0071] After compressed gas enters the lower sealing plate 13, the cavity between the lower sealing plate 13 and the floating air bag 5 is filled with compressed gas. The floating air bag 5 gradually expands as the compressed gas is introduced, and the magnetic powder layer on the surface of the floating air bag 5 gradually rises with the expansion, generating a magnetic attraction with the flexible magnetic patch 9 at the bottom of the upper mold frame 1. After being magnetically attracted, the flexible magnetic patch 9 drives the upper sealing plate 11 to move inside the upper slot 40. The lower sealing plate 13 and the floating air bag 5 move in the direction of gas impact under the push of the compressed gas. The lower sealing plate 13 drives the connecting rod 16 to move, and the connecting rod 16 drives the sliding sleeve 15 to move outside the central tube 17. After the compressed gas disappears, the first spring 18 drives the sliding sleeve 15 to reset.
[0072] The compressed gas drives the air bladder 5 to expand, and the magnetic attraction of the opposite magnet drives the upper mold frame 1 and the lower mold frame 4 to automatically align. This solves the problems of installation error and mold closing impact offset that exist in traditional rigid insert shaft positioning, and realizes dynamic and accurate calibration before mold closing. The reset function of the first spring 18 can drive the sliding sleeve 15, connecting rod 16 and lower sealing plate 13 to reset synchronously after the compressed gas stops input, so that the mold frame returns to the initial state before mold closing, and prepares for the calibration process of the next injection molding operation. This realizes the cyclic reuse of the mechanism, without the need for manual intervention to reset, and is suitable for the continuous operation requirements of automated injection molding production lines.
[0073] When the upper sealing plate 11 moves, it drives the lower displacement block 42 to move along the embedded shaft 44. After the lower displacement block 42 loses power, the fourth spring 43 drives it to reset. The lower displacement block 42, the fourth spring 43, and the embedded shaft 44 are hidden inside the side rectangular groove 41. When the flexible magnetic patch 9 and the floating airbag 5 generate a magnetic attraction, the upper mold frame 1 and the lower mold frame 4 are aligned. When the amount of compressed gas inside the floating airbag 5 reaches a critical value, the pressure valve on one side of the floating airbag 5 opens, and the air outlet connected to the pressure valve sprays compressed gas towards the core body 2, performing a single flush on the outside of the core body 2.
[0074] This design integrates mold base calibration and core cleaning functions. When the air bladder 5 expands to the critical pressure, it automatically opens the air outlet and uses the remaining compressed gas to blow the outer surface of the core body 2. This effectively removes residual material impurities and dust from the core surface, preventing impurities from affecting the fitting accuracy between the core and the core cavity. This solves the problem of traditional mold bases requiring manual core cleaning and the resulting workpiece molding defects due to incomplete cleaning, thus improving the molding quality of injection molded workpieces. At the same time, the compressed gas serves as a power source, eliminating the need for additional cleaning equipment and reducing the operating cost and structural complexity of the mold base.
[0075] When the upper sealing plate 11 and the flexible magnetic patch 9 move out and move inside the upper groove 40, the lower pressure plate 46 and the blocking plate 45 remain upright inside the drainage groove 37, preventing the liquid material flowing out of the feed pipe 10 from flowing into the core cavity 12 from the drainage groove 37. When the upper sealing plate 11 and the flexible magnetic patch 9 lose their magnetic attraction and fall back, the upper sealing plate 11 squeezes the lower pressure plate 46 during its return movement. The lower pressure plate 46 is forced to cause the blocking plate 45 to flip, opening the passage from the drainage groove 37 to the core cavity 12, allowing the liquid material to flow normally into the core cavity 12.
[0076] When the lower sealing sheet 13 moves along the impact direction of the compressed gas, it drives the adhesive block 29 to move. The adhesive block 29 drives the shifting rod 21 to move. The shifting rod 21 drives the positioning strip 23 to move along the embedded slide rail 22. At the same time, the shifting rod 21 drives the bonding strip 27 to move. The bonding strip 27 drives the pin 28 to move. The pin 28 moves out from the inside of the positioning and merging hole 8, and the upper mold frame 1 and the lower mold frame 4 are in a separated state.
[0077] The above-mentioned technical solution can realize mold frame calibration and automatic mold opening by using the power of compressed gas through the moving linkage splitting mechanism of the lower sealing plate 13. No additional mold opening power source is required, which reduces the structural complexity and energy consumption of the mold frame. After the pin 28 moves out of the positioning and merging hole 8, the upper mold frame 1 and the lower mold frame 4 automatically separate, which facilitates the demolding operation of the injection molded workpiece. This solves the problem that traditional mold frames require manual or additional power to open the mold, and improves the automation level of the mold frame.
[0078] When the compressed gas stops pushing the lower sealing plate 13, the lower sealing plate 13 causes the adhesive block 29 to move in the opposite direction. The adhesive block 29 causes the displacement rod 21 to move in the opposite direction along the embedded slide rail 22. The second spring 25 causes the displacement rod 21 to reset and move. The anti-detachment ring 26 restricts the excessive movement of the displacement rod 21. When the upper mold frame 1 and the lower mold frame 4 are in the merged state, the adhesive strip 27 moves in the opposite direction with the displacement rod 21, causing the pin 28 to re-insert into the inner side of the positioning and merging hole 8. The upper mold frame 1 and the lower mold frame 4 remain in the merged state.
[0079] The second spring 25 automatically resets the shift rod 21 and pin 28 after the compressed gas stops being input, allowing the pin 28 to re-insert into the positioning and merging hole 8, thus achieving automatic mold locking between the upper mold base 1 and the lower mold base 4, ensuring the stability of the mold closing state and preventing mold base displacement during injection molding. The anti-detachment ring 26 limits the travel of the shift rod 21, preventing excessive movement of the shift rod 21 that could cause the mechanism to jam, and ensuring the operational reliability of the splitting mechanism. The entire mold opening and locking process is linked with the calibration mechanism, requiring no additional power, and achieving automated cyclic operation of the mold base, adapting to the needs of continuous injection molding production.
[0080] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.
[0081] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.
Claims
1. A precision plastic mold frame with a floating core calibration mechanism, comprising an upper mold frame and a lower mold frame, characterized in that: The lower mold frame has core bodies on both sides of the top, and a calibration mechanism is provided in the middle of the top of the lower mold frame. The calibration mechanism includes a lower mold core groove, which is symmetrically opened in the middle of the top of the lower mold frame. Four insert shafts are vertically arranged around the outer perimeter of the upper mold frame. A central hole is provided in the middle of the upper mold frame. A central merging shaft is vertically arranged inside the central hole. Core cavities are opened on both sides of the surface of the upper mold frame. The core cavities are aligned with the core body. An embedded protrusion is provided inside the core cavity. A flow channel is opened on the side of the core cavity near the middle of the upper mold frame. An auxiliary mechanism is provided on the outside of the flow channel near the middle of the upper mold frame. The auxiliary mechanism includes a blocking plate, which is located inside the flow channel. A feed pipe is provided at one end of the upper mold frame and the lower mold frame. An external hole is provided on the outside of the feed pipe. A splitting mechanism is provided on the surface of the upper mold frame and the lower mold frame parallel to the external hole. The splitting mechanism includes positioning and merging holes, which are symmetrically opened on the surface of the upper mold frame. The calibration mechanism further includes a floating airbag, an air inlet pipe, an upper sealing plate, a lower sealing plate, an axis door plate, a sliding sleeve, a connecting rod, a central tube, a first spring, a positioning foot, a crank rod, a first side rotating shaft, a flipping plug, a third spring, a second side rotating shaft, an upper slot, a side rectangular slot, a lower displacement block, a fourth spring, and an embedded shaft. A lower sealing plate is provided inside the lower mold core slot, and a rectangular cavity is provided inside the lower sealing plate. The top of this rectangular cavity is covered by the floating airbag. An air outlet and a pressure valve are provided on the side of the floating airbag near the core body. An axis door plate is rotatably mounted on one end of the rectangular cavity side of the lower sealing plate. A first side rotating shaft is provided at the upper ends of both sides of the axis door plate. A crank rod is provided at the lower end of the back of the first side rotating shaft. A flipping plug is provided on the back of the crank rod. Flipping plugs are provided on both sides of the flipping plug. The device has a second lateral rotating shaft, a central tube is provided on the outside of the flip-over plug, a third spring is connected between the back of the flip-over plug and the front end of the inner side of the central tube, a positioning foot is provided at the front end of the outside of the central tube, a sliding sleeve is sleeved in the middle of the outside of the central tube, a connecting rod is provided at the end of the sliding sleeve near the air bladder, a first spring is provided on the back of the connecting rod, the air inlet pipe is located on the central axis of the central tube, the upper slot is symmetrically opened in the middle of the surface of the upper mold frame, two lateral rectangular slots are opened at both ends of the inner side of the upper slot, an embedded shaft is vertically arranged on the inner side of the lateral rectangular slot, a lower displacement block is sleeved on the outside of the embedded shaft, a fourth spring is provided at the bottom of the lower displacement block, an upper sealing plate is provided at the top of the lower displacement block, and flexible magnetic patches are symmetrically arranged at both ends of the top of the upper sealing plate. The inner surface of the buoyancy airbag is provided with a magnetic powder layer with magnetic properties opposite to those of the flexible magnetic patch, and the outer edge of the buoyancy airbag is flush with the outer edge of the flexible magnetic patch.
2. A precision plastic mold frame with a floating core calibration mechanism according to claim 1, characterized in that: The connecting rod and the lower sealing plate are fixedly connected, and the moving direction of the connecting rod is the same as the moving direction of the sliding sleeve outside the central tube.
3. A precision plastic mold frame with a floating core calibration mechanism according to claim 1, characterized in that: The first side-mounted rotating shaft and the inner side of the lower sealing sheet form a rotating structure, and the second side-mounted rotating shaft and the central tube form a rotating structure.
4. A precision plastic mold frame with a floating core calibration mechanism according to claim 1, characterized in that: The auxiliary mechanism also includes a lower pressure plate, which is provided on the side of the top of the blocking plate near the middle of the upper mold frame. The edge of the lower pressure plate is parallel to the edge of the bottom side of the upper sealing plate.
5. A precision plastic mold frame with a floating core calibration mechanism according to claim 1, characterized in that: The overall structure of the blocking plate is the same as the inner structure of the drainage channel, and the blocking plate and the inner side of the drainage channel form a rotating structure.
6. A precision plastic mold frame with a floating core calibration mechanism according to claim 1, characterized in that: The splitting mechanism further includes a sealing plug, a shifting rod, an embedded slide rail, a positioning strip, a sliding piece, a second spring, an anti-detachment ring, an adhesive strip, a pin, and an adhesive block. A pin is provided on the outer side of the positioning and merging hole, and an adhesive strip is provided on the back of the pin. A shifting rod is provided on one side of the adhesive strip surface. A sealing plug is provided at the connection point between the shifting rod and the upper mold frame. Embedded slide rails are provided on both sides of the shifting rod. An anti-detachment ring is fitted onto the front end of the shifting rod. A positioning strip is provided in the middle of the shifting rod. A sliding piece is provided at the end of the shifting rod near the inner side of the upper mold frame. A second spring is provided between the positioning strip and the sliding piece. An adhesive block is provided at the tail end of the shifting rod.
7. A precision plastic mold frame with a floating core calibration mechanism according to claim 6, characterized in that: The two sides of the slider and the inner side of the embedded slide rail form a sliding structure, and the positioning strip is fixedly connected to the embedded slide rail.
8. A precision plastic mold frame with a floating core calibration mechanism according to claim 6, characterized in that: One end of the displacement rod is fixedly connected to the adhesive block, and the adhesive block is fixedly connected to one end of the lower sealing sheet. The moving direction of the displacement rod is the same as the moving direction of the lower sealing sheet.