Injection mold base with mold cavity convenient to replace

Abstract

The utility model relates to the technical field of injection mold blanks, in particular to an injection mold blank convenient for replacing a mold cavity, which comprises a bottom plate, a lower mold fixedly mounted on the surface of the upper end of the bottom plate, an upper mold movably mounted above the lower mold, a mold cavity movably mounted in the lower mold, and a plurality of connecting mechanisms arranged on the lower mold. The connecting mechanism comprises a bearing block, a U-shaped frame, two push rods and two sliding rods, and the bearing block is movably inserted into the inner wall of the lower die. Through the arrangement of the connecting mechanism, the die cavity can be conveniently replaced, meanwhile, the position of the bearing block can be adjusted according to the sizes of different die cavities to be installed, and therefore the die cavity can be conveniently replaced; according to the mold base, to-be-mounted mold cavities of different sizes are fixed, the applicability of the mold base is effectively improved, the position between the upper mold and the lower mold can be further corrected by matching the correcting columns with the limiting columns, and the situation that the using effect is affected due to deviation is avoided.

Description

Technical Field

[0001] This utility model relates to the field of injection mold blank technology, specifically an injection mold blank that facilitates mold cavity replacement. Background Technology

[0002] Injection mold preforms are components in molds and are an important part of forming plastic products. The core function of injection mold preforms is to shape the complex internal structure of plastic parts, such as internal holes and irregular shapes. These structures are often difficult to form in one go by other methods. They can produce products with complex external structures, high dimensional accuracy, or inserts in one go.

[0003] In the prior art, such as the mold with replaceable mold cavity proposed in patent application number "CN202322538874.X", this utility model improves and optimizes the mold in the prior art by designing a mold cavity seat, mold cavity groove and disassembly structure, etc., so that the operator can adapt to the different processing requirements during actual use to change the specifications and size of the mold cavity by changing the mold cavity seat. This solves the problem that the mold cavity cannot be replaced individually in the original mold, thereby improving the overall flexibility of the mold.

[0004] However, in the aforementioned patent applications, the mold cavity can be replaced by setting up a disassembly and assembly structure. However, the disassembly and assembly structure cannot adapt to mold cavities of different sizes. In actual use, when different injection molded parts are produced, different sizes of mold cavities are required, resulting in poor applicability. Utility Model Content

[0005] The purpose of this invention is to provide an injection mold blank that facilitates mold cavity replacement, thereby solving the problems mentioned in the background art.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] An injection mold blank that facilitates mold cavity replacement includes a base plate, a lower mold fixedly mounted on the upper surface of the base plate, an upper mold movably mounted above the lower mold, a mold cavity movably mounted inside the lower mold, and a plurality of connecting mechanisms provided on the lower mold;

[0008] The connecting mechanism includes a bearing block, a U-shaped frame, two push rods, and two slide rods. The bearing block is movably inserted into the inner wall of the lower mold. The two push rods are movably inserted into the outer wall of the lower mold and are fixedly connected to the bearing block. The two slide rods are fixedly installed on the outer wall of the lower mold. A telescopic connecting rod is fixedly connected to the inner wall of the bearing block. One end of the telescopic connecting rod is fixedly connected to a limit block. A return spring is sleeved on the outside of the telescopic connecting rod. Several fixing grooves are opened on the outer wall of the mold cavity, and the fixing grooves fit with the limit block.

[0009] Preferably, a movable plate is sleeved between the two slide rods, and a support spring is sleeved on the outside of each of the two slide rods.

[0010] Preferably, the U-shaped frame is fixedly installed on the outer side wall of the lower mold, a nut is fixedly installed on the outer side wall of the U-shaped frame, a rotating shaft is inserted inside the nut, a turntable is fixedly connected to the outer wall of the rotating shaft, and a handle is fixedly connected to one end of the rotating shaft.

[0011] Preferably, the outer wall of the rotating shaft is provided with a first thread located inside the nut, and the inner wall of the nut is provided with a second thread, with the first thread and the second thread cooperating with each other.

[0012] Preferably, two insert rods are fixedly connected to the outer wall of the movable plate, and the outer walls of the two push rods are provided with a number of limiting grooves, and the limiting grooves are matched with one end of the insert rod.

[0013] Preferably, the upper surface of the mold cavity is provided with a plurality of grooves, and a plate is inserted into each of the grooves. A buckle is fixedly installed at the top of the plate and a T-shaped fixing block is fixedly installed at the bottom of the groove, and the T-shaped fixing block and the buckle cooperate with each other.

[0014] Preferably, guide rods are inserted into the upper surface of the upper mold and near the four corners, and the bottom ends of the four guide rods are fixedly connected to the base plate;

[0015] Two limiting posts are fixedly installed on the upper surface of the base plate near both sides. A circular block is movably installed inside each of the four limiting posts. A buffer spring is installed between the bottom surface of the circular block and the bottom of the limiting post. Two straightening posts are fixedly connected to the bottom surface of the upper mold near both sides, and the straightening posts fit with the limiting posts.

[0016] The beneficial effects of this utility model are:

[0017] 1. This utility model, by setting a connecting mechanism, enables the mold cavity to be automatically fixed by the limiting movable block and the fixing groove when the mold cavity is inserted into the lower mold. Then, the installation stability of the mold cavity is further enhanced by the insert plate, buckle and T-shaped fixing block, which facilitates the replacement of the mold cavity. Moreover, the position of the bearing block can be adjusted according to the size of different mold cavities to be installed, so as to fix the mold cavities of different sizes and effectively improve the applicability of the mold blank.

[0018] 2. This utility model, through the cooperation of various straightening columns and various limiting columns, can further correct the position between the upper mold and the lower mold, avoid displacement and affect the use effect. The circular block and buffer spring can buffer the downward pressure, prevent the straightening column from pressing directly into the limiting column and causing damage, and extend the service life. At the same time, it has a certain buffering effect on the downward pressure when the upper mold and the lower mold are closed. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a partial structural schematic diagram of the present invention;

[0022] Figure 3 This is a sectional view of the lower mold in this utility model;

[0023] Figure 4 This is a partial structural diagram of the lower mold and the mold cavity in this utility model;

[0024] Figure 5 This utility model Figure 4 Enlarged view of point B in the middle;

[0025] Figure 6 This is a cross-sectional view of the bearing block in this utility model;

[0026] Figure 7 This is a schematic diagram of the structure of the limiting movable block and the fixing groove in this utility model;

[0027] Figure 8 This is an enlarged view of point C in coating 7 of this utility model.

[0028] The attached figures are labeled as follows:

[0029] 1. Base plate; 2. Upper mold; 3. Guide rod; 4. Lower mold; 5. Mold cavity; 6. Limiting post; 7. Correcting post; 8. Push rod; 9. Circular block; 10. Movable plate; 11. Slide rod; 12. Rotating shaft; 13. Turntable; 14. U-shaped frame; 15. Nut; 16. Insert rod; 17. Telescopic connecting rod; 18. Bearing block; 19. Limiting movable block; 20. Insert plate; 21. T-shaped fixing block; 22. Buckle; 23. Groove; 24. Fixing slot. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0031] An injection mold base that facilitates mold cavity replacement, such as Figures 1-8 As shown, the system includes a base plate 1, a lower mold 4 fixedly mounted on the upper surface of the base plate 1, an upper mold 2 movably mounted above the lower mold 4, a mold cavity 5 movably mounted inside the lower mold 4, and several connecting mechanisms provided on the lower mold 4. The connecting mechanisms include a bearing block 18, a U-shaped frame 14, two push rods 8, and two slide rods 11. The bearing block 18 is movably inserted into the inner wall of the lower mold 4, and the two push rods 8 are movably inserted into the outer wall of the lower mold 4 and are fixedly connected to the bearing block 18. The two slide rods 11 are fixedly mounted on the outer wall of the lower mold 4. A telescopic connecting rod 17 is fixedly connected to the inner wall of the bearing block 18. One end of the telescopic connecting rod 17 is fixedly connected to a limit movable block 19. A return spring is sleeved on the outside of the telescopic connecting rod 17. Several fixing grooves 24 are opened on the outer wall of the mold cavity 5, and the fixing grooves 24 fit with the limit movable block 19.

[0032] A movable plate 10 is fitted between the two slide rods 11. A support spring is fitted on the outside of each slide rod 11. A U-shaped frame 14 is fixedly installed on the outer wall of the lower mold 4. A nut 15 is fixedly installed on the outer wall of the U-shaped frame 14. A rotating shaft 12 is inserted inside the nut 15. A turntable 13 is fixedly connected to the outer wall of the rotating shaft 12. A handle is fixedly connected to one end of the rotating shaft 12.

[0033] The outer wall of the rotating shaft 12, located inside the nut 15, has a thread 1, and the inner wall of the nut 15 has a thread 2. The thread 1 and the thread 2 cooperate with each other. With the cooperation of the thread 1 and the thread 2, the rotating shaft 12 can be connected and fixed to the nut 15. Rotating the rotating shaft 12 can release the locking of the thread 1 and the thread 2, so that the fixed and rotating states of the rotating shaft 12 can be flexibly adjusted.

[0034] Two insert rods 16 are fixedly connected to the outer wall of the movable plate 10. Several limiting grooves are opened on the outer wall of the two push rods 8, and the limiting grooves fit with one end of the insert rod 16. Several grooves 23 are opened on the upper surface of the mold cavity 5. Insert plates 20 are inserted into the grooves 23. A buckle 22 is fixedly installed at the top of the insert plate 20. A T-shaped fixing block 21 is fixedly installed at the bottom of the groove 23. The T-shaped fixing block 21 and the buckle 22 cooperate with each other. The buckle 22 is made of elastic metal. When it is fitted onto the T-shaped fixing block 21, it can produce a certain deformation and tightly engage with the T-shaped fixing block 21 to fix the position of the insert plate 20.

[0035] In use, the upper mold 2 closes onto the lower mold 4 along the guide rod 3, and raw material is introduced between the lower mold 4 and the upper mold 2. After cooling, the injection molding operation is completed and the mold blank can be used. This is existing technology and will not be described in detail.

[0036] When it is necessary to replace the lower mold 4, first pull each insert plate 20 upward from each groove 23, and release the buckle 22 from the T-shaped fixing block 21 to release the restriction on each limiting movable block 19. Then move the mold cavity 5 upward so that the inner wall of the fixing groove 24 moves along the outer wall of the limiting movable block 19, so that the limiting movable block 19 moves into the bearing block 18 to release the restriction on the mold cavity 5. Similarly, the other limiting movable blocks 19 are moved into the bearing blocks 18. At this time, the mold cavity 5 can be removed from the lower mold 4 to complete the disassembly. Then, according to the size of the mold cavity 5 to be installed later, adjust the position of each bearing block 18 in the lower mold 4 accordingly.

[0037] When adjusting the position of the bearing block 18, simply rotate the shaft 12 by turning the handle, so that the shaft 12 rotates along the inside of the nut 15, the first thread and the second thread are unlocked, and the turntable 13 rotates 180°, releasing the obstruction on one side of the movable plate 10, so that the movable plate 10 moves away from the push rod 8 by the rebound force of the support spring, and drives the two insert rods 16 to move out of the limiting grooves on the two push rods 8, releasing the fixation of the push rods 8. At this time, the bearing block 18 can be moved by pushing the two push rods 8 to adjust the position of the bearing block 18. After adjustment, the turntable 13 is rotated in the same way to reset the movable plate 10, and drive one end of the two insert rods 16 to be inserted into the corresponding limiting grooves on the two push rods 8 respectively, thus fixing the bearing block 18 and fixing the position of the push rods 8 after adjustment.

[0038] After adjusting the positions of each push rod 8, similarly insert the mold cavity 5 to be installed into the lower mold 4, ensuring that the outer wall of the mold cavity 5 is tightly against the outer wall of each bearing block 18. During insertion, the bottom surface of the mold cavity 5 contacts the outer wall of each limiting movable block 19, which can squeeze and push the limiting movable block 19 into the bearing block 18. The telescopic connecting rod 17 shortens, and the return spring is compressed and contracted until the mold cavity 5 is fully inserted. The position of the limiting movable block 19 is directly aligned with the fixing groove 24 opened on the mold cavity 5. The return spring then rebounds. Under the action of force, the telescopic connecting rod 17 can be extended, thereby causing one end of the limiting movable block 19 to be inserted into the fixing groove 24, completing the initial fixing of the mold cavity 5. Then, the insert plate 20 is reinserted into the groove 23 and placed close to the side of the limiting movable block 19, so that the buckle 22 is engaged on the T-shaped fixing block 21 to fix the position of the insert plate 20. This can block one side of the limiting movable block 19 and prevent it from being moved out of the fixing groove 24 later, further reinforcing the limiting and fixing of the mold cavity 5, thereby completing the replacement.

[0039] The above operations facilitate the replacement of the mold cavity 5, and the position of the bearing block 18 can be adjusted according to different mold cavities 5 to be installed, so as to fix mold cavities 5 of different sizes to be installed, effectively improving the applicability of the mold blank.

[0040] Guide rods 3 are inserted into the upper surface of the upper mold 2 near the four corners, and the bottom ends of the four guide rods 3 are fixedly connected to the base plate 1. Two limiting posts 6 are fixedly installed on the upper surface of the base plate 1 near both sides. A circular block 9 is movably installed inside the four limiting posts 6. A buffer spring is installed between the bottom surface of the circular block 9 and the bottom end of the limiting post 6. Two straightening posts 7 are fixedly connected to the bottom surface of the upper mold 2 near both sides, and the straightening posts 7 fit with the limiting posts 6.

[0041] Specifically, when the upper mold 2 is closed, each straightening column 7 moves downward and is inserted into each limiting column 6. This further corrects the position between the upper mold 2 and the lower mold 4, preventing misalignment and affecting the performance. When the straightening column 7 is inserted into the limiting column 6, the circular block 9 first receives the downward pressure of the straightening column 7, causing the buffer spring to be compressed. Then, under the action of the rebound force of the buffer spring, the downward pressure is buffered, preventing the straightening column 7 from being directly pressed into the limiting column 6 and causing damage, thus extending the service life. At the same time, it has a certain buffering effect on the downward pressure when the upper mold 2 and the lower mold 4 are closed.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. An injection moulding preform facilitating the exchange of the mould cavity, comprising a base plate (1), characterised in that, The lower die (4) is movably installed above the lower die (4), and the lower die (4) is movably installed inside the lower die (4). The connecting mechanism comprises a bearing block (18), a U-shaped frame (14), two push rods (8) and two slide rods (11), the bearing block (18) is movably inserted into the inner wall of the lower die (4), the two push rods (8) are movably inserted into the outer wall of the lower die (4), and the two push rods (8) are fixedly connected with the bearing block (18), the two slide rods (11) are fixedly installed on the outer wall of the lower die (4), the inner wall of the bearing block (18) is fixedly connected with the telescopic connecting rod (17), one end of the telescopic connecting rod (17) is fixedly connected with the limiting movable block (19), the telescopic connecting rod (17) is externally sleeved with a reset spring, and the outer wall of the mold cavity (5) is provided with a plurality of fixed grooves (24), and the fixed grooves (24) are matched with the limiting movable block (19).

2. An injection mold blank according to claim 1, wherein, The outer part of the two slide rods (11) is sleeved with a movable plate (10), and the outer part of the two slide rods (11) is sleeved with a supporting spring.

3. The injection mold blank of claim 1, wherein, The U-shaped frame (14) is fixedly installed on the outer wall of the lower die (4), the outer wall of the U-shaped frame (14) is fixedly installed with a nut (15), the inner part of the nut (15) is inserted with a rotating shaft (12), the outer wall of the rotating shaft (12) is fixedly connected with a rotating disc (13), and one end of the rotating shaft (12) is fixedly connected with a handle.

4. An injection mold core according to claim 3, wherein, The outer wall of the rotating shaft (12) and the inner part of the nut (15) are provided with threads, and the inner wall of the nut (15) is provided with threads.

5. The injection mold blank of claim 2 wherein, The outer wall of the movable plate (10) is fixedly connected with two inserting rods (16), the outer wall of the two push rods (8) is provided with a plurality of limiting grooves, and the limiting grooves are matched with one end of the inserting rod (16).

6. The injection mold blank of claim 1 wherein, The upper end surface of the mold cavity (5) is provided with a plurality of grooves (23), a plurality of inserting plates (20) are inserted into the grooves (23), a buckle (22) is fixedly installed at the inner top of the inserting plate (20), a T-shaped fixed block (21) is fixedly installed at the inner bottom of the groove (23), and the T-shaped fixed block (21) is matched with the buckle (22).

7. The injection mold blank of claim 1 wherein, The upper end surface of the upper die (2) and the four corners are movably inserted with guide rods (3), and the bottoms of the four guide rods (3) are fixedly connected with the bottom plate (1). The upper end surface of the bottom plate (1) is fixedly installed with two limiting columns (6) near the two sides, the inner part of the four limiting columns (6) is movably installed with a circular block (9), and the bottom surface of the circular block (9) is installed with a buffer spring between the inner bottom of the limiting column (6).

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