Secondary core-pulling structure of sliding block

Abstract

The utility model relates to a slider secondary core-pulling structure which comprises two pressing strips, a first slider insert and a second slider insert are sequentially arranged between the two pressing strips in a sliding mode, a strip-shaped through hole is formed in the first slider insert, a driving block is arranged in the strip-shaped through hole in a sliding mode, and a through hole notch communicated with the strip-shaped through hole is formed in the first slider insert. A connecting rod penetrating through the through hole notch in a matched mode is arranged on the driving block and connected with the second sliding block insert, a sliding rod is arranged on the through hole notch, clamping blocks are arranged at the two ends of the sliding rod, pressing strip clamping grooves allowing the corresponding clamping blocks to be inserted in a matched mode are formed in the pressing strip, and connecting rod clamping grooves allowing the corresponding clamping blocks to be inserted in a matched mode are formed in the connecting rod. According to the structure, additional executing elements such as an air cylinder or a telescopic motor are not needed, the space of a mold is saved, the structure is simpler, and meanwhile it is ensured that the first sliding block insert cannot move in the first core pulling stage through the sliding rod and the clamping block.

Description

Technical Field

[0001] This utility model relates to the field of core pulling in plastic molds, and more specifically, to a secondary core pulling structure for a slider. Background Technology

[0002] When using a mold to mold a product, if the product sidewall has through holes, grooves, or bosses, the molded parts of the concave and convex parts will hinder the product from being demolded after molding. The product cannot be directly ejected from the mold. Except in very few cases where forced demolding is possible, the molded parts of the concave and convex parts must generally be made into movable cores. They must be pulled out before the product is demolded, and then the product is ejected from the cavity or core. When the mold is closed, they are reset.

[0003] In actual production, sliders are often used to pull the core out of the product. Different core-pulling mechanisms are set according to different product shapes and core-pulling requirements to achieve the purpose of product molding. However, many products with undercut structures require a long stroke to completely demold in one core-pulling operation, which can easily damage the product and increase the size of the mold. Therefore, core-pulling needs to be done in two stages. For example, a Chinese national patent discloses a two-stage core-pulling mold and core-pulling method (application number: CN202311524051.X). It uses an actuator to pull the inner core out of the mold cavity, and the slide remains stationary under the resistance of the resistance spring. The actuator is fixed to the lower mold by a mounting bracket. This not only increases the size of the mold but also increases the cost. At the same time, the resistance spring is prone to performance degradation after long-term use, causing the slide to move a small distance with the inner core during the first stage of core-pulling. This makes the second core-pulling incomplete and easily damages the product. Utility Model Content

[0004] To address the aforementioned shortcomings of existing technologies, a secondary core-pulling structure for sliders is provided.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a slider secondary core-pulling structure, including two spaced-apart pressure bars, with a first slider insert and a second slider insert slidably disposed between the two pressure bars. A strip-shaped through hole is provided on the top surface of the first slider insert, and a driving block that slides in the same direction as the first slider insert is slidably disposed in the strip-shaped through hole. A through-hole notch communicating with the strip-shaped through hole is provided on the side wall of the first slider insert near the second slider insert. A connecting rod matching the driving block and passing through the through-hole notch is provided. One end of the through hole notch is connected to the second slider insert. The through hole notch has a sliding rod that slides perpendicularly to the connecting rod on the corresponding inner sidewalls near the two pressure bars. Both ends of the sliding rod are provided with a locking block. The locking block is a quadrangular prism structure with an isosceles trapezoidal base. The pressure bar has a pressure bar groove on the surface near the corresponding sliding rod for the corresponding locking block to be inserted. The connecting rod has a connecting rod groove near the drive block for the corresponding locking block to be inserted. The second slider insert is provided with a shovel base mechanism for driving the second slider insert to slide.

[0006] Preferably, the first slider insert has a sliding through hole on the through hole notch for sliding the slider rod, and the slider rod is slidably disposed in the sliding through hole.

[0007] Preferably, the shovel base mechanism includes a shovel base disposed on the front mold, and the top surface of the second slider insert is provided with an inclined insert through hole that cooperates with the shovel base. The insert through hole is inclined from the top surface of the second slider insert to the side away from the first slider insert.

[0008] Preferably, the insert through hole is a rectangular through hole, and an insert notch is provided on the inner side wall of the insert through hole away from the first slider insert. The insert through hole and the insert notch form a slide groove with a T-shaped cross-section. The shovel base is a T-shaped structure and is slidably disposed in the slide groove. The surface of the second slider insert away from the first slider insert is an insert inclined surface. The inclination angle of the insert inclined surface is the same as the inclination angle of the axis of the insert through hole. A reset block is connected to one end of the shovel base that passes through the insert notch. The reset block is provided with a reset inclined surface that cooperates with the insert inclined surface.

[0009] Preferably, the second slider insert has an insert groove on the insert inclined surface, and an inclined panel is detachably installed in the insert groove, the inclined panel being coplanar with the insert inclined surface.

[0010] Preferably, the shovel base has a shovel base groove on the surface away from the reset block, and a shovel base plate is detachably installed in the shovel base groove. The shovel base plate abuts against the side wall of the insert through hole away from the insert notch.

[0011] Preferably, a connecting block is provided at the end of the connecting rod away from the driving block. The connecting block is detachably connected to the second slider insert. The driving block, connecting rod, and connecting block are integrally formed. The connecting block is provided with a first molded through hole that passes through the connecting block, connecting rod, and driving block in sequence. The first molded through hole is a countersunk through hole. The first slider insert is provided with a second molded through hole on the inner wall of the strip-shaped through hole, which is coaxial with the first molded through hole. A molded insert is provided in the first molded through hole. A limiting block is provided on the molded insert at the countersunk part of the first molded through hole. The limiting block abuts against the second slider insert.

[0012] The beneficial effects of this utility model are as follows: the first stage of core pulling is initiated by the sliding of the second slider insert through the shovel base mechanism. At this time, the slide rod cooperates with the locking block inserted into the pressure strip slot to keep the first slider insert stationary. After the drive block slides to abut against the inner wall of the strip through hole in the core pulling direction, the slide rod and the connecting rod slot are directly opposite each other. The shovel base mechanism drives the first slider insert to slide through the drive block to initiate the second stage of core pulling. At this time, the slide rod slides through the locking block in the pressure strip slot, so that another locking block matches and inserts into the connecting rod slot. The first slider insert slides with the second slider insert, thus completing the second core pulling. This structure can complete the second core pulling without additional cylinders or telescopic motors, saving mold space and simplifying the structure. At the same time, the slide rod and locking block ensure that the first slider insert will not move during the first core pulling stage, preventing damage to the product. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the horizontal cross-sectional structure of an embodiment of the present utility model;

[0014] Figure 2 This is a vertical cross-sectional structural diagram of an embodiment of the present utility model;

[0015] Figure 3 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0016] Figure 4 This is a schematic diagram of the structure of the shovel base and the reset block according to an embodiment of the present invention;

[0017] Figure 5 This is a schematic diagram of the structure of the second slider insert according to an embodiment of the present invention;

[0018] Figure 6 This is a schematic diagram of the structure of the first slider insert in this embodiment of the present invention.

[0019] Reference numerals: 1 pressure strip, 10 pressure strip slot, 2 first slider insert, 20 strip-shaped through hole, 21 through hole notch, 22 sliding through hole, 23 second forming through hole, 3 second slider insert, 30 insert through hole, 31 insert notch, 32 insert groove, 33 inclined plate, 4 drive block, 40 connecting rod, 400 connecting rod slot, 41 connecting block, 42 ​​first forming through hole, 5 slide rod, 50 locking block, 6 shovel base, 60 shovel base groove, 61 shovel base plate, 7 reset block, 8 forming insert, 80 limiting block. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. In addition, the directional terms mentioned in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," and "outer," are only for reference to the directions in the accompanying drawings. The directional terms are used to better and more clearly explain and understand this utility model, and are not intended to indicate or imply the necessary orientation of this utility model. Therefore, they should not be construed as limitations on this utility model.

[0021] Examples of embodiments of this utility model Figures 1 to 6As shown, a secondary core-pulling structure for a slider includes two spaced-apart pressure strips 1, extending laterally and spaced apart in the front-to-back direction. A first slider insert 2 and a second slider insert 3 are slidably mounted between the two pressure strips 1. The first slider insert 2 is located to the left of the second slider insert 3. A strip-shaped through hole 20 is provided on the top surface of the first slider insert 2. A driving block 4, which slides in the same direction as the first slider insert 2, is slidably mounted in the strip-shaped through hole 20. The driving block 4 slides laterally in the strip-shaped through hole 20. A through hole notch 21 communicating with the strip-shaped through hole 20 is provided on the side wall of the first slider insert 2 near the second slider insert 3. The through hole notch 21 is located on the right side wall of the first slider insert 2. A connecting rod 40 is provided on the driving block 4, which passes through the through hole notch 21. The connecting rod 40 is located on the right side wall of the driving block 4. One end of the connecting rod 40, which extends out of the through hole notch 21, is connected to the second slider insert 2. The through-hole notch 21 has sliding rods 5 on its corresponding inner sidewalls near the two pressure strips 1, each sliding perpendicular to the connecting rod 40. That is, the two sliding rods 5 are correspondingly located on the front and rear inner sidewalls of the through-hole notch 21, and slide in the front-rear direction. Each end of the sliding rod 2 has a locking block 50, corresponding to the front and rear ends of the sliding rod 5. The locking block 50 is a quadrangular prism structure, and the base of the locking block 50 is an isosceles trapezoid. The lower base of the isosceles trapezoid of the locking block 50... The side of the slide bar 1 is connected to the slide bar 5. The pressure bar 1 is provided with a pressure bar groove 10 on the surface near the corresponding slide bar 5 for the corresponding locking block 50 to be inserted. The connecting rod 40 is provided with a connecting rod groove 400 near the driving block 4 for the corresponding locking block 50 to be inserted. The cross section of the pressure bar groove 10 and the cross section of the connecting rod groove 400 are both isosceles trapezoids that match the bottom surface of the locking block 50. The second slider insert 3 is provided with a shovel base mechanism for driving the second slider insert 3 to slide.

[0022] The first stage of core pulling begins when the second slider insert 3 is slidable by the shovel mechanism. At this time, the slide rod 5 cooperates with the locking block 50 inserted into the pressure strip slot 10 to keep the first slider insert 2 stationary. After the drive block 4 slides to abut against the inner wall of the strip through hole 20 in the direction of core pulling, that is, after the drive block 4 abuts against the right side wall of the strip through hole 20, the slide rod 5 is directly opposite the connecting rod slot 400. The shovel mechanism drives the first slider insert 2 to slide through the drive block 4, thus starting the second stage of core pulling. At this time, the slide rod 5 slides through the locking block in the pressure strip slot 10, so that another locking block 50 matches and inserts into the connecting rod slot 400. At this time, the first slider insert 2 slides with the second slider insert 3, thus completing the second core pulling. This structure can complete the second core pulling without additional cylinders or telescopic motors, saving mold space and making the structure simpler. At the same time, the slide rod 5 and the locking block 50 ensure that the first slider insert 2 will not move during the first stage of core pulling, preventing damage to the product.

[0023] Further improvements, such as Figure 1 and Figure 6 As shown, the first slider insert 2 has a sliding through hole 22 on the through hole notch 21 for sliding rod 5. The sliding rod 5 is slidably disposed in the sliding through hole 22. That is, the sliding through holes 22 are provided on the front and rear inner sidewalls of the through hole notch 21. When the locking block 50 cannot enter the sliding through hole 22, the front and rear inner sidewalls of the through hole notch 21 and the front and rear outer sidewalls of the first slider insert 2 are also provided with receiving grooves for receiving the locking block 50, thereby preventing the locking block 50 from interfering with the sliding of the first slider insert 2. Preferably, the sliding rod 5 is a cuboid structure, the sliding through hole 22 is also a rectangular structure, and the locking block 50 can enter the sliding through hole 22, so there is no need to process the receiving groove.

[0024] Further improvements, such as Figure 1 , Figure 4 and Figure 5 As shown, the shovel base mechanism includes a shovel base 6 disposed on the front mold. The top surface of the second slider insert 3 is provided with an inclined insert through hole 30 that cooperates with the shovel base 6. The insert through hole 30 is inclined from the top surface of the second slider insert 3 to the side away from the first slider insert 2, that is, the insert through hole 30 is inclined from the upper left to the lower right.

[0025] Further improvements, such as Figure 1 , Figure 4 and Figure 5 As shown, the insert through hole 30 is a rectangular through hole. An insert notch 31 is provided on the inner wall of the insert through hole 30 away from the first slider insert 2. The insert through hole 30 and the insert notch 31 form a groove with a T-shaped cross-section. The shovel base 6 is a T-shaped structure and is slidably fitted into the groove. The surface of the second slider insert 3 away from the first slider insert 2 is an insert inclined surface. The inclination angle of the insert inclined surface is the same as the inclination angle of the axis of the insert through hole 30, that is, the insert inclined surface also moves from the upper left to the right. Inclined downwards, the shovel base 6 is connected to a reset block 7 at one end through the insert notch 31. The reset block 7 is provided with a reset inclined surface that cooperates with the inclined surface of the insert. When the mold is closed, the first slider insert 2 and the second slider insert 3 are reset through the shovel base 6. The reset block 7 assists the shovel base 6 in resetting the first slider insert 2 and the second slider insert 3, reducing the force on the shovel base 6, thereby extending the life of the shovel base 6. At the same time, it can also prevent the pressure in the cavity from pushing the first slider insert 2 and the second slider insert 3 during product molding.

[0026] Further improvements, such as Figure 1 and Figure 5As shown, the second slider insert 3 has an insert groove 32 on the insert inclined surface. Preferably, there are two insert grooves 32, which are respectively arranged on the front and rear sides of the insert notch 31. An inclined plate 33 is detachably installed in the insert groove 32. The inclined plate 33 is coplanar with the insert inclined surface. The bottom of the insert groove 32 is provided with a threaded hole. The inclined plate is provided with a countersunk through hole. The inclined plate is connected by a screw passing through the countersunk through hole and the threaded hole, so that the inclined plate 33 can be detachably installed in the insert groove 32. When the friction wear of the inclined plate 33 causes insufficient core pulling accuracy, the inclined plate 33 can be quickly replaced.

[0027] Further improvements, such as Figure 2 and Figure 4 As shown, the shovel base 6 has a shovel base groove 60 on the surface away from the reset block 7. A shovel base plate 61 is detachably installed in the shovel base groove 60. The shovel base plate 61 abuts against the side wall of the insert through hole 30 away from the insert notch 31. A threaded hole is provided at the bottom of the shovel base groove 60. A countersunk through hole is provided on the shovel base plate 61. A screw passes through the countersunk through hole and the threaded hole to connect, thereby detachably installing the shovel base plate 61 in the shovel base groove 60. When the friction wear of the shovel base plate 61 causes insufficient core pulling accuracy, the shovel base plate 61 can be quickly replaced.

[0028] Further improvements, such as Figure 1 , Figure 2 and Figure 6As shown, a connecting block 41 is provided at the end of the connecting rod 40 away from the driving block 4. The connecting block 41 is detachably connected to the second slider insert 3. The driving block 4, connecting rod 40, and connecting block 41 are integrally formed, and the driving block 4, connecting rod 40, and connecting block 41 form an I-shaped structure. A first forming through hole 42 is provided on the connecting block 41, the connecting rod 40, and the driving block 4 in sequence. The first forming through hole 42 is a countersunk through hole, and the countersunk head of the countersunk through hole is located on the right side surface of the connecting block 41. The first slider insert 2 is provided with a second forming through hole 23 coaxial with the first forming through hole 42 on the inner side wall of the strip through hole 20. Preferably, the first slider insert 2 is provided with an installation through hole on the left inner side wall of the strip through hole 20. The installation through hole is also a countersunk through hole, and a through hole insert is provided in the installation through hole. The second forming through hole 23 is located on the right side surface of the through hole insert. 2. A baffle that abuts against the through-hole insert is detachably installed on the left inner side wall of the strip-shaped through hole 20. The baffle is provided with a relief hole to avoid the forming insert. The baffle prevents the through-hole insert from sliding out of the installation through hole. The easily damaged part of the structure during product molding is located on the through-hole insert. After the easily damaged part of the structure is damaged, the damaged through-hole insert can be replaced without replacing the entire first slider insert 2, saving maintenance costs. A forming insert 8 is provided in the first forming through hole 42. A limiting block 80 is provided on the forming insert 8 at the countersunk part of the first forming through hole 42. The limiting block 80 abuts against the second slider insert 3. The second slider insert 3 drives the driving block 4, the connecting rod 40 and the connecting block 41 to slide, thereby driving the forming insert 8 to pull the core. When the forming insert 8 involved in product molding is damaged, only the forming insert 8 needs to be replaced, without replacing the driving block 4, the connecting rod 40 and the connecting block 41.

[0029] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A slider-type secondary core-pulling structure, comprising two spaced-apart pressure strips; characterized in that, A first slider insert and a second slider insert are slidably arranged between the two pressure strips. A strip-shaped through hole is provided on the top surface of the first slider insert. A driving block that slides in the same direction as the first slider insert is slidably arranged in the strip-shaped through hole. A through-hole notch connecting the strip-shaped through hole is provided on the side wall of the first slider insert near the second slider insert. A connecting rod that matches and passes through the through-hole notch is provided on the driving block. One end of the connecting rod extending out of the through-hole notch is connected to the second slider insert. A sliding rod perpendicular to the connecting rod is provided on the corresponding inner side wall of the through-hole notch near the two pressure strips. A locking block is provided at both ends of the sliding rod. The locking block has a quadrangular prism structure. The bottom surface of the locking block is an isosceles trapezoid. A pressure strip locking groove for the corresponding locking block to be inserted is provided on the surface of the pressure strip near the corresponding sliding rod. A connecting rod locking groove for the corresponding locking block to be inserted is provided on the connecting rod near the driving block. A shovel base mechanism for driving the second slider insert to slide is provided on the second slider insert.

2. The slider secondary core-pulling structure according to claim 1, characterized in that, The first slider insert has a sliding through hole on the through hole notch for sliding the slider rod; the slider rod is slidably mounted in the sliding through hole.

3. The slider secondary core-pulling structure according to claim 1, characterized in that, The shovel base mechanism includes a shovel base disposed on the front mold; the top surface of the second slider insert is provided with an inclined insert through hole that cooperates with the shovel base; the insert through hole is inclined from the top surface of the second slider insert to the side away from the first slider insert.

4. The slider secondary core-pulling structure according to claim 3, characterized in that, The insert through hole is a rectangular through hole; an insert notch is provided on the inner side wall of the insert through hole away from the first slider insert; the insert through hole and the insert notch form a slide groove with a T-shaped cross-section; the shovel base is a T-shaped structure; the shovel base is fitted and slidably disposed in the slide groove; the surface of the second slider insert away from the first slider insert is an insert inclined surface; the inclination angle of the insert inclined surface is the same as the inclination angle of the axis of the insert through hole; a reset block is connected to one end of the shovel base that passes through the insert notch; the reset block is provided with a reset inclined surface that cooperates with the insert inclined surface.

5. The slider secondary core-pulling structure according to claim 4, characterized in that, The second slider insert has an insert groove on its inclined surface; a detachable inclined panel is installed in the insert groove; the inclined panel is coplanar with the insert inclined surface.

6. The slider secondary core-pulling structure according to claim 4, characterized in that, The shovel base has a shovel base groove on the surface away from the reset block; a shovel base plate is detachably installed in the shovel base groove; the shovel base plate abuts against the side wall of the insert through hole away from the insert notch.

7. The slider secondary core-pulling structure according to claim 1, characterized in that, A connecting block is provided at the end of the connecting rod away from the driving block; the connecting block is detachably connected to the second slider insert; the driving block, connecting rod, and connecting block are integrally formed; a first molded through hole is provided on the connecting block, the connecting rod, and the driving block in sequence; the first molded through hole is a countersunk through hole; the first slider insert has a second molded through hole coaxial with the first molded through hole on the inner wall of the strip-shaped through hole; a molded insert is provided in the first molded through hole; a limiting block is provided on the molded insert at the countersunk part of the first molded through hole; the limiting block abuts against the second slider insert.

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