An ink cartridge flow guide cavity precision injection molding mold

Abstract

The utility model discloses a kind of ink cartridge flow guide cavity precision injection molding mould, it is related to injection molding technical field, including static mould, the cavity of detachably installed in static mould and ejector pin, mould is provided with quick mounting mechanism, including the circular groove of being set on static mould, positioning groove and curved chute, by rotating the handle in circular groove, drive the ball on support rod along curved chute sliding, realize the quick locking or release of cavity, and by fixed block insertion square slot of support rod inside locking, mould is also provided with anti-permeation mechanism, including the top block of being fixed in the top of ejector pin, and the blocking piece and sealing ring of being set in the first recess and second recess of cavity, sealing ring elastically fits at the gap of blocking piece and top block. The utility model realizes the quick replacement of cavity, improves production efficiency, effectively prevents material leakage simultaneously, guarantees product precision, and can take out residue when demoulding, protects ejector pin.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, and in particular to a precision injection molding mold for an ink cartridge guide cavity. Background Technology

[0002] Injection molding is a major process for the mass production of complex plastic products. As a key component in printing equipment, the dimensional accuracy and surface quality of the ink cartridge's internal flow channels directly affect the ink's flow characteristics. Precision injection molding is used in its production. In conventional injection mold designs, after the plastic part is formed, it needs to be ejected from the cavity by ejector pins or other ejection mechanisms. During injection molding, the molten plastic inside the cavity is under high temperature and pressure, exhibiting strong fluidity. This high pressure drives the molten material to attempt to penetrate any possible gaps in the mold.

[0003] The gap between the ejector pin and the ejector pin hole becomes a weak point. Some molten material will inevitably be squeezed into the gap, forming excess burrs or flash on the product after cooling. This not only seriously affects the dimensional accuracy and product qualification rate of precision components such as ink cartridge guide cavity, but also requires additional manual or mechanical processes for repair, reducing production efficiency.

[0004] The plastic residue left in the gaps will gradually accumulate after solidification, increasing the movement resistance of the ejector pins and aggravating the wear of the ejector pins and the mold. Over time, this residue may even cause the ejector pins to jam, bend, or even break, resulting in mold damage and production interruption, affecting the stability of production and the service life of the mold.

[0005] Therefore, this utility model proposes a precision injection molding mold for ink cartridge guide cavity to overcome the shortcomings of the prior art. Utility Model Content

[0006] In the existing technology, the molten material in the precision injection molding mold for the ink cartridge guide cavity can easily seep in through the gap between the ejector pin and the cavity, resulting in burrs on the product. Furthermore, the accumulation of residue can cause wear, jamming, or even breakage of the ejector pin, affecting production stability and mold life. The present invention aims to provide a precision injection molding mold for the ink cartridge guide cavity with an improved structure that can effectively solve the above problems.

[0007] This utility model provides a precision injection molding mold for an ink cartridge guide cavity, comprising: a moving mold, a stationary mold, and a cavity, the cavity being detachably installed within the stationary mold; and an ejector pin, which passes through the cavity and can reciprocate. It also includes a quick-release mechanism for quickly fixing the cavity into the stationary mold, and a leak-proof mechanism set between the ejector pin and the cavity.

[0008] The stationary mold has an installation space for the cavity to be accommodated, and a circular groove, a positioning groove, and a curved inclined groove are formed around the installation space; the bottom of the cavity is fixedly connected to a positioning post that slides with the positioning groove.

[0009] The quick-installation mechanism includes a rotatable handle rotatably disposed in a circular groove, and a support rod that is pulsatorically connected to the rotatable handle; the support rod is provided with a ball that is rolled into a curved groove; the support rod is also provided with a square groove and a fixing block that can be inserted and removed through the square groove for locking the support rod after installation.

[0010] The seepage prevention mechanism includes a top block fixedly connected to the top of the ejector pin; a first groove and a second groove are formed around the ejector pin on the cavity; a blocking plate is placed in the first groove, and a sealing ring is placed in the second groove. The sealing ring elastically fits the gap between the blocking plate and the top block to achieve a reliable seal.

[0011] Preferably, the curved groove is an inclined groove with one end deep and the other end shallow. When the ball slides along the inclined surface of the curved groove, the support rod generates a thrust or pull force along the axial direction of the cavity by rotating, thereby achieving locking or releasing.

[0012] Preferably, when the ball slides from the shallow end to the deep end of the curved groove, the support rod pushes the cavity to fit tightly against the stationary mold; at this time, the fixing block passes through the stationary mold and is inserted into the square groove to restrict the rotation of the support rod and prevent it from loosening.

[0013] Preferably, the top of the cavity is provided with an angled section to facilitate pulling out; when the fixing block is pulled out and the handle is rotated in the opposite direction, the ball slides from the deep end to the shallow end of the curved groove, causing the cavity to be moved outward by force, making it easier for the operator to pull it out.

[0014] Preferably, the blocking plate in the seepage prevention mechanism is an annular structure, with its inner hole fitted around the outer periphery of the top block; the sealing ring surrounds the outer periphery of the top block and radially abuts against the inner wall of the blocking plate.

[0015] Preferably, the inner diameter of the inner hole of the blocking plate is equal to or has an interference fit with the outer diameter of the top block to ensure a very high tight fit between the top block and the blocking plate, thus initially blocking the molten material.

[0016] Preferably, the outer diameter of the sealing ring in its natural state is slightly larger than the inner diameter of the inner hole of the blocking plate, so that the sealing ring generates a large pre-tightening friction force with the blocking plate due to pressure deformation after assembly.

[0017] Preferably, during the demolding process, when the ejector pin and the ejector block are ejected, the sealing ring drives the blocking plate to move together through the pre-tightening friction force, and removes the material residue adhering to the gap between the ejector block and the blocking plate, thereby achieving an automatic cleaning function and preventing residue accumulation.

[0018] This utility model has the following beneficial effects: 1. This utility model, by setting up a quick-installation mechanism composed of a throttle, support rod, ball bearing, curved groove and fixing block, uses rotation to drive the ball bearing to slide in the curved groove to generate axial thrust or pull force. This solves the problems of cumbersome disassembly and assembly, inaccurate positioning, time-consuming and labor-intensive, and seriously affecting production efficiency when changing cavities in the prior art. It achieves quick, convenient and accurate installation and disassembly of cavities, shortens equipment maintenance downtime, and improves production flexibility.

[0019] 2. This utility model, by setting up an anti-leakage mechanism composed of a top block, a blocking plate, and a sealing ring, utilizes a first groove and a second groove opened on the cavity to accommodate the blocking plate and the sealing ring respectively, so that the sealing ring elastically fits into the gap between the top block and the blocking plate. This solves the problem in the prior art that molten material easily seeps into the cavity through the gap between the ejector pin and the cavity under injection pressure, resulting in burrs on the product and affecting precision. It effectively seals the gap, prevents material leakage, and ensures the precision molding quality of the ink cartridge guide cavity.

[0020] 3. This utility model, through further design, makes the outer diameter of the sealing ring slightly larger than the inner diameter of the blocking plate, so that after the two are assembled, a large pre-tightening friction force is generated due to deformation. This solves the problem in the prior art that even if a small amount of material residue is generated in the gap, it is difficult to clean and easily accumulates, leading to ejector pin jamming or wear. It achieves the self-cleaning function by using friction to automatically carry out the material residue in the gap during demolding and ejection, ensuring the smooth movement of the ejector pin for a long time and extending the service life of the mold. Attached Figure Description

[0021] Figure 1 This is a perspective view of a precision injection molding die for an ink cartridge flow channel proposed in this utility model; Figure 2 This is a partial cross-sectional view of a precision injection molding die for an ink cartridge flow channel proposed in this utility model; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is an exploded view of the stationary mold of a precision injection molding die for an ink cartridge flow channel proposed in this utility model. Figure 5 This is a cross-sectional view of the ejector pin of a precision injection molding mold for an ink cartridge guide cavity proposed in this utility model. Figure 6 for Figure 5 Enlarged view of point B in the middle.

[0022] Legend: 1. Moving mold; 2. Stationary mold; 3. Cavity; 4. Quick-release mechanism; 401. Circular groove; 402. Rotary handle; 403. Support rod; 404. Square groove; 405. Curved oblique groove; 406. Fixing block; 407. Ball; 408. Positioning groove; 409. Positioning pin; 5. Ejector pin; 6. Leakage prevention mechanism; 601. First groove; 602. Baffle plate; 603. Ejector block; 604. Second groove; 605. Sealing ring. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0024] Please refer to Figures 1 to 6 This utility model provides a precision injection molding mold for ink cartridge guide cavity, which aims to solve the technical problems existing in the prior art: the cavity replacement is complicated and time-consuming, and the ejector pin position is prone to melt leakage leading to residue problems.

[0025] like Figure 1 and Figure 2 As shown, a precision injection molding mold for an ink cartridge guide cavity includes a moving mold 1 and a stationary mold 2 used in conjunction with the moving mold 1. A cavity 3 is detachably installed in the stationary mold 2. An ejector pin 5 is provided in the cavity 3. The ejector pin 5 is used to eject the molded product and can reciprocate within the cavity 3. The molding die also includes a quick-release mechanism 4 for quickly fixing the cavity 3 into the stationary mold 2; such as Figure 4 As shown, the stationary mold 2 has an installation space for the cavity 3 to be accommodated, and a circular groove 401, a positioning groove 408, and a curved inclined groove 405 are formed on the periphery of the installation space; a positioning post 409 is fixedly connected to the bottom of the cavity 3, and the positioning post 409 is inserted into and slidably fitted into the positioning groove 408 on the stationary mold 2; the quick-installation mechanism 4 includes a handle 402, which is rotatably disposed in the circular groove 401 of the stationary mold 2; the quick-installation mechanism 4 also includes a support rod 403, one end of which is throttle-connected to the handle 402 for rotating together with the handle 402; as Figure 3As shown, a ball 407 is fixedly installed on the support rod 403. The ball 407 rolls and slides into the curved inclined groove 405 on the stationary mold 2. A square groove 404 is also provided on the support rod 403. The quick-release mechanism 4 also includes a fixing block 406, which can be inserted and removed through the square groove 404 to lock the support rod 403 after it has been rotated into place. And, as Figure 5 and Figure 6 As shown, the molding die also includes a seepage prevention mechanism 6 disposed between the ejector pin 5 and the cavity 3; a top block 603 is fixedly connected to the top of the ejector pin 5; a first groove 601 and a second groove 604 are provided on the cavity 3 around the position of the ejector pin 5; a blocking plate 602 is placed in the first groove 601; a sealing ring 605 is placed in the second groove 604, and the sealing ring 605 elastically fits the gap between the blocking plate 602 and the top block 603 to achieve sealing.

[0026] Please refer to Figure 3 and Figure 4 The curved groove 405 in the quick-installation mechanism 4 is designed as an inclined groove with one end deep and the other end shallow. When installing the cavity 3, the positioning pin 409 at the bottom of the cavity 3 is first inserted into the positioning groove 408 of the stationary mold 2, and then the handle 402 set in the circular groove 401 is rotated. The handle 402 drives the support rod 403 to rotate through the transmission connection. The ball 407 set on the support rod 403 slides along the inclined surface of the curved groove 405 from the shallow end to the deep end. During this process, the inclined surface structure of the curved groove 405 generates a thrust on the ball 407. The thrust is transmitted through the support rod 403 and finally generates a thrust on the cavity 3 along its installation axis, causing the cavity 3 to move inward until it is tightly fitted with the stationary mold 2. After the fit is in place, the fixing block 406 is inserted through the stationary mold 2 and into the square groove 404 on the support rod 403. The fixing block 406 restricts the rotation of the support rod 403 in this way, thereby locking the cavity 3. When disassembling cavity 3, first pull out the fixing block 406, turn the handle 402 in the opposite direction, and the ball 407 rotates in the opposite direction with the support rod 403 and slides along the curved groove 405 from the deep end to the shallow end; at this time, the inclined structure of the curved groove 405 forces the support rod 403 and cavity 3 to move outward under force; after the cavity 3 is pushed out a certain distance, the operator can use the inclined angle set on the top of the cavity 3 to pull it out completely; this quick-installation mechanism 4, which uses rotational motion and inclined groove cooperation, ensures the convenience of cavity 3 installation and the stability after fixing.

[0027] In a preferred embodiment, to achieve the locking and releasing function of the quick-release mechanism 4, the curved groove 405 in the quick-release mechanism 4 is specifically an inclined groove with one end deep and the other end shallow, and the ball 407 rolls and fits into the inclined surface of the inclined groove; to achieve reliable locking of the support rod 403, the installation path of the fixing block 406 passes through the stationary mold 2 and finally inserts into the square groove 404 of the support rod 403; to facilitate the disassembly and pulling out of the cavity 3, the top of the cavity 3 is provided with an angle for easy pulling out.

[0028] As another preferred embodiment, please refer to Figure 5 and Figure 6 The structure of the seepage prevention mechanism 6 is defined as follows: the blocking plate 602 in the seepage prevention mechanism 6 is specifically a ring structure, which has an inner hole that is fitted around the outer periphery of the top block 603, and the inner diameter of the inner hole of the blocking plate 602 is equal to or has an interference fit with the outer diameter of the top block 603 to ensure a tight fit between the two; the sealing ring 605 surrounds the outer periphery of the top block 603 and abuts radially against the inner wall of the blocking plate 602; preferably, the outer diameter of the sealing ring 605 in its natural state is designed to be slightly larger than the inner diameter of the inner hole of the blocking plate 602, so that the sealing ring 605 generates a pre-tight friction force with the blocking plate 602 due to pressure deformation after assembly.

[0029] Working principle: When different specifications of guide cavities are needed and the original cavity 3 is damaged, cavity 3 needs to be replaced on the stationary mold 2. After roughly aligning the positioning pin 409 at the bottom of cavity 3 with the positioning groove 408 on the stationary mold 2, push cavity 3 into the stationary mold 2 along the positioning pin 409 in the quick-installation mechanism 4, guided by the positioning groove 408. After cavity 3 has penetrated a certain distance into the stationary mold 2, turn the handle 402 in the circular groove 401 on the stationary mold 2. The rotation of the handle 402 drives the rotation of the support rod 403. The ball 407 causes the support rod 403 to rotate downward along the curved groove 405. Since the curved groove 405 is an inclined and curved structure, the ball 407 and the support rod 403 rotate downward along the curved groove 405. The sliding groove 405 is subjected to a backward force, which allows the support rod 403 to rotate while the cavity 3 moves towards the interior of the stationary mold 2 to fit. The support rod 403 changes from vertical to horizontal, thereby fixing the cavity 3. Then, the support rod 403 is fixed by inserting a fixing block 406 through the square groove 404 on the support rod 403 to prevent it from rotating. When disassembling the cavity 3, after pulling out the fixing block 406, the handle 402 is turned to allow the support rod 403 to rotate in the sliding groove 405. The support rod 403 changes from horizontal to vertical, and the cavity 3 moves outward a certain distance under force. The cavity 3 can then be pulled out through the angle at the top of the cavity 3, realizing the rapid replacement of the cavity 3 to adapt to the production of different specifications of guide cavities and maintain production efficiency. Furthermore, during injection molding in cavity 3, when the moving mold 1 and the stationary mold 2 are tightly fitted, and plastic is injected through the injection port to form a flow channel, it is demolded by ejector pin 5 after cooling and forming. A blocking plate 602 is placed in the first groove 601 on cavity 3, and an ejector block 603 is fixed to the top of ejector pin 5. The inner diameter of the blocking plate 602 in the anti-leakage mechanism 6 is the same as the outer diameter of the ejector block 603. Simultaneously, a second groove 604 is formed on cavity 3 to place a sealing ring 605, which fits against the blocking plate 602. The gap between ejector pin 5 and ejector block 603 prevents material from seeping in. During demolding, ejector pin 5 and ejector plate 602 are ejected. The outer diameter of the sealing ring 605 is slightly larger than the inner diameter of the ejector plate 602, which causes the deformation of the sealing ring 605 to increase and the friction of the ejector plate 602 to carry out the material near the gap between the ejector plate 602 and ejector block 603 through the friction between the sealing ring 605 and the ejector plate 602. This prevents the material from entering the cavity through the gap between ejector pin 5 and cavity 3, which would result in material residue on ejector pin 5, affecting demolding and damaging ejector pin 5.

Claims

1. A precision injection molding mold for a cartridge guide cavity, comprising a moving mold (1), a stationary mold (2), a cavity (3) detachably installed in the stationary mold (2), and an ejector pin (5) passing through the cavity (3) and capable of reciprocating motion; Its features are, The mold also includes a quick-installation mechanism (4) for quickly fixing the cavity (3) into the stationary mold (2). The stationary mold (2) has an installation space for the cavity (3) to be accommodated, and a circular groove (401), a positioning groove (408) and a curved inclined groove (405) are provided around the installation space. The bottom of the cavity (3) is fixedly connected to a positioning post (409) that slides with the positioning groove (408). The quick-installation mechanism (4) includes a handle (402) rotatably disposed in the circular groove (401) and a support rod (403) that is pulsatorically connected to the handle (402). The support rod (403) is provided with a ball (407) that is rolled into the curved groove (405); the support rod (403) is provided with a square groove (404) and a fixing block (406) that can be inserted and removed through the square groove (404). The mold also includes a seepage prevention mechanism (6) disposed between the ejector pin (5) and the cavity (3). A top block (603) is fixedly connected to the top of the ejector pin (5). A first groove (601) and a second groove (604) are provided around the ejector pin (5) on the cavity (3). A blocking plate (602) is placed in the first groove (601), and a sealing ring (605) is placed in the second groove (604). The sealing ring (605) elastically fits the gap between the blocking plate (602) and the top block (603).

2. The precision injection molding mold for the ink cartridge guide cavity according to claim 1, characterized in that, The curved groove (405) is an inclined groove with one end deep and the other end shallow. When the throttle (402) drives the support rod (403) to rotate, the ball (407) slides along the inclined surface of the curved groove (405), thereby generating a thrust or pull force along its axial direction on the cavity (3) through the support rod (403).

3. The precision injection molding mold for the ink cartridge guide cavity according to claim 2, characterized in that, When the ball (407) slides from the shallow end to the deep end of the curved groove (405), the support rod (403) pushes the cavity (3) to fit tightly against the stationary mold (2), and the fixing block (406) passes through the stationary mold (2) and is inserted into the square groove (404) to restrict the rotation of the support rod (403).

4. The precision injection molding mold for the ink cartridge guide cavity according to claim 1, characterized in that, The top of the cavity (3) is provided with an angled edge to facilitate pulling out. When the fixing block (406) is pulled out and the handle (402) is rotated in the opposite direction, the ball (407) slides from the deep end to the shallow end of the curved groove (405), causing the cavity (3) to be moved outward by force.

5. The precision injection molding mold for the ink cartridge guide cavity according to claim 1, characterized in that, The blocking plate (602) in the seepage prevention mechanism (6) is an annular structure, with its inner hole fitted around the outer periphery of the top block (603). The sealing ring (605) surrounds the outer periphery of the top block (603) and radially abuts against the inner wall of the blocking plate (602).

6. The precision injection molding mold for the ink cartridge flow guide cavity according to claim 5, characterized in that, The inner diameter of the inner hole of the blocking plate (602) is equal to or has an interference fit with the outer diameter of the top block (603).

7. The precision injection molding mold for the ink cartridge guide cavity according to claim 5, characterized in that, The outer diameter of the sealing ring (605) in its natural state is slightly larger than the inner diameter of the inner hole of the blocking plate (602), so that the sealing ring (605) generates a pre-tightening friction force with the blocking plate (602) due to pressure deformation after assembly.

8. The precision injection molding mold for the ink cartridge guide cavity according to claim 7, characterized in that, During the demolding process, when the ejector pin (5) and the ejector block (603) are ejected, the sealing ring (605) drives the blocking plate (602) to move together through the pre-tightening friction force, and removes the material residue adhering to the gap between the ejector block (603) and the blocking plate (602).

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