Secondary sliding block sequence control mechanism and operation method thereof

Abstract

The invention discloses a secondary sliding block sequence control mechanism and an operation method thereof, and belongs to the field of secondary sliding blocks, the secondary sliding block sequence control mechanism comprises sliding blocks and an oil cylinder, the oil cylinder drives the sliding blocks to move, the sliding blocks comprise a first sliding block and a second sliding block, the end parts of the first sliding block and the second sliding block are provided with sliding block insert cores, and the sliding block insert cores are inserted into the first sliding block and the second sliding block. The sliding block insert core is used for forming a barb on a product, the oil cylinder is connected with the first sliding block, and the first sliding block is connected with the second sliding block through a sequence mechanism; the sequence mechanism comprises a limiting mechanism and a locking mechanism, the limiting mechanism is used for locking the second sliding block during a first stroke, and the locking mechanism is used for locking the first sliding block and the second sliding block together during a second stroke; by arranging the sequence mechanism, sequence control over the first sliding block and the second sliding block is achieved, one oil cylinder is used for driving the two sliding blocks to move in sequence, damage to barbs on products is avoided due to the fact that the sliding blocks move in sequence, and the structure is small in overall size and high in applicability.

Description

Technical Field

[0001] The invention relates to the field of secondary sliders, and in particular to a secondary slider sequence control mechanism and an operating method thereof. Background Art

[0002] Plastic products are widely used in daily life. Each plastic product corresponds to a set of molds, and production is achieved through the cooperation of molds and injection molding machines. Plastic products are diverse. According to the different functions and effects of the products, different undercut features often appear on plastic products (such as various buckle features on the products, the products cannot be demolded normally at zero-degree stripping angles, etc.). These undercut features usually require a slider mechanism to be designed on the plastic mold to achieve product demolding. For some products with simple undercut structures, demolding can be achieved through a single slider. For some complex products with undercut structures, a secondary slider combined movement must be designed on the mold to achieve demolding. When opening the mold, the movement sequence of the secondary slider is very important. If the sequence is wrong, demolding may fail at best, and may even cause mold collision at worst. Therefore, it is very important to control the movement sequence of the secondary slider of the injection mold.

[0003] For the structure where the secondary slider movement sequence is open first and then close (synchronous mold closing), the mold structure is simple and can be realized by only the inclined guide column and the air avoidance hole. For the structure where the secondary slider movement sequence is open first and then close, and then close the mold, the mold structure is more complicated. In this case, the mold must have two sets of independent oil cylinders or air cylinders to control the movement sequence of the secondary slider respectively. The size of the mold using this structural design will be correspondingly increased (because the oil cylinder or air cylinder arrangement will occupy a certain space). For example: a product needs a set of secondary slider structure. For the layout design of one mold and two cavities, four sets of independent oil cylinders or air cylinders are required on the mold. At this time, we will face several serious problems in mold design: 1. The size of the mold is very large, and a larger machine is needed to accommodate the mold. 2. Usually, there are only two sets of independent oil cylinder control systems on the male mold side of the standard injection molding machine. At this time, either invest in upgrading the injection molding machine oil control system or connect all the sliders in series to produce normally (the biggest disadvantage of connecting all the sliders in series is that when the oil control system alarms during the production process, it is impossible to determine which group of sliders is abnormal). 3: The large machine has a large injection volume, but if the product volume is small and the amount of glue is far less than the machine's injection volume, the raw material is prone to carbonization in the machine barrel, filling is unbalanced, and the size is difficult to adjust. The first condition to improve this molding problem is to reduce the machine and select a suitable machine for production according to the product volume and glue volume. The size of the mold design must also match the selected machine.

[0004] If the mold uses independent oil cylinders or air cylinders to control the movement sequence of a group of secondary sliders respectively, the mold will have the problem that it cannot be matched with the machine due to its large size and cannot be installed on the machine. Only by reducing the number of cavities in the mold to reduce the mold size to match the machine, in this way, it cannot guarantee the customer's usage, and more molds, machines and personnel need to be developed to improve production capacity. The investment cost increases, and the labor cost and maintenance cost will also increase accordingly. Summary of the Invention

[0005] The purpose of the present invention is to provide a secondary slider sequence control mechanism and its operation method. The two sliders are connected by a sequence mechanism, and the oil cylinder is connected to one of the sliders, and the sequence mechanism is cooperated to realize the sequential movement of the two sliders.

[0006] To solve the above technical problems, the following technical solutions are adopted: In the first aspect, the present invention provides a secondary slider sequence control mechanism, including a slider and an oil cylinder, the oil cylinder drives the slider to move, the slider includes a first slider and a second slider, slider inserts are provided at the ends of the first slider and the second slider, and the slider inserts are used for forming the reverse hooks on the product. The oil cylinder is connected to the first slider, and the first slider is connected to the second slider through a sequence mechanism; The sequence mechanism includes a limiting mechanism and a locking mechanism. The limiting mechanism is used to lock the second slider during the first stroke, and the locking mechanism is used to lock the first slider and the second slider together during the second stroke; Wherein, the first stroke is that the oil cylinder drives the first slider to move, and the second stroke is that the oil cylinder drives the first slider and the second slider to move together; after the first stroke is completed, while the limiting mechanism releases the locking of the second slider, the locking mechanism locks the first slider and the second slider together.

[0007] Optionally, the first slider is located in the groove guide on the second slider. The slider insert of the second slider is divided into two parts spaced apart up and down. The slider insert of the first slider is located between the two parts spaced apart up and down. A long strip-shaped stop block through hole is opened on the groove guide, and the stop block through hole is used for the limiting mechanism to act on the first slider through the limiting mechanism; During the first stroke, the first slider moves in the groove guide.

[0008] Optionally, a first T-shaped part is provided on the slider insert of the first slider, and a second T-shaped part is provided on the slider insert of the second slider. When the slider insert of the first slider is located between the two parts of the slider insert of the second slider, the first T-shaped part is in contact with the second T-shaped part in cooperation; During a single stroke when opening the mold, the first T-shaped part on the slider insert of the first slider drives the upper part of the slider insert of the second slider to move downward and the lower part to move upward, causing the slider insert of the second slider to disengage from the barb on the product.

[0009] Optionally, the second slider is located within the groove guide on the first slider. The slider insert of the first slider is divided into two vertically spaced-apart parts, and the slider insert of the second slider is located between the two vertically spaced-apart parts. A long strip-shaped stop block through-hole is provided on the groove guide for the limiting mechanism to act on the second slider through the limiting mechanism. During the single stroke process, the first slider is driven by the oil cylinder, and the second slider moves relative to the first slider within the groove guide.

[0010] Optionally, the oil cylinder pull rod of the oil cylinder is connected to one end of the first slider away from the slider insert.

[0011] Optionally, the limiting mechanism includes a stop block, a spring, a spring fixing seat, a groove inclined plane provided at the bottom of the first slider, and a limiting groove provided at the bottom of the second slider. The stop block is provided with a protruding inclined plane that cooperates with the groove inclined plane and a limiting protrusion that cooperates with the limiting groove. The spring is arranged within the spring fixing seat, and one end of the stop block is arranged within the spring fixing seat. After the first slider moves a single stroke, the stop block is pressed down, the protruding inclined plane disengages from the groove inclined plane, and the limiting protrusion disengages from the limiting groove, releasing the locking of the second slider.

[0012] Optionally, a guide block is further provided on the spring mounting seat, and the guide block is used for guiding the movement of the stop block.

[0013] Optionally, the locking mechanism includes a limiting block, a pressing strip, a first groove provided on the pressing strip, a second groove provided on the first slider, and a third groove provided on the second slider. The pressing strip is installed on both sides of the slider. When the first slider makes a single stroke, one end of the limiting block is located within the first groove, and the other end is located within the second groove or the third groove. When the first slider makes a second stroke, both ends of the limiting block are respectively located within the second groove and the third groove.

[0014] Optionally, it further includes a male mold core, a male mold plate, an upper ejector plate, a lower ejector plate, and a lower mold fixing plate. The product is arranged on the male mold core. The male mold core, the sequencing mechanism, and the slider are all installed on the male mold plate. A wear-resistant block is arranged between the slider and the male mold plate. The male mold plate is installed on the lower mold fixing plate. A ejector plate is further arranged between the male mold plate and the lower mold fixing plate. The ejector plate is connected with an ejector mechanism for ejecting the product.

[0015] In a second aspect, the present invention provides an operation method of a secondary slider sequencing control mechanism, which is implemented by using the secondary slider sequencing control mechanism according to any one of the first aspect, and includes the following steps: During mold opening, the oil cylinder drives the first slider to move away from the product by a stroke S 1 , the slider insert of the first slider disengages from the barb on the product. While the locking mechanism locks the first slider and the second slider, the limiting mechanism releases the locking of the second slider, and the oil cylinder drives the first slider and the second slider to move away from the product together by a secondary stroke S 2 , and the slider insert on the second slider disengages from the barb on the product; During mold closing, the first slider and the second slider are locked together by the locking mechanism, and the oil cylinder drives the first slider and the second slider to move back towards the product by a secondary stroke S 2 , the slider insert of the second slider is in place, the second slider is locked by the limiting mechanism, and the oil cylinder drives the first slider to move back towards the product by a stroke S 1 , and the slider insert of the first slider is in place; When the first slider is locked, the stop block height of the stop block in the locking mechanism for the slider is the stop block height S 3 , and when a stroke S 1 is completed, the moving distance of the stop block in the vertical direction is the stop block stroke S 4 ; wherein, the S 4 is greater than or equal to S 3 .

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are: 1. By setting a sequencing mechanism, the present invention realizes the sequencing control of the first slider and the second slider, uses one oil cylinder to drive the sequential movement of the two sliders, and avoids damage to the barbs on the product during the sequential movement of the sliders. The overall structure of the present invention is small in size and strong in applicability.

[0017] 2. The present invention has two different installation methods, adopts two sliders of different sizes, and slightly changes the structure of the sequencing mechanism for different installation methods to realize the sequential movement of the large and small sliders, and adapts to the production of barbs on the product according to the sequential movement of different sliders. Description of the Drawings

[0018] Figure 1 is one of the top - view structural schematic diagrams of the secondary slider sequence mechanism provided by the present invention; Figure 2 is the second top - view structural schematic diagram of the secondary slider sequence mechanism provided by the present invention; Figure 3 is the third top - view structural schematic diagram of the secondary slider sequence mechanism provided by the present invention; Figure 4 is one of the side - sectional structural schematic diagrams of the secondary slider sequence mechanism provided by the present invention; Figure 5 is the second side - sectional structural schematic diagram of the secondary slider sequence mechanism provided by the present invention Figure 6 is the split diagram of the sequence structure of installation method 1 provided by the present invention; Figure 7 is the schematic diagram when the stop block does not lock the second slider in installation method 1 provided by the present invention; Figure 8 is the schematic diagram when the stop block locks the second slider in installation method 1 provided by the present invention; Figure 9 is the schematic diagram of the installation structure of the two slider inserts in installation method 1 provided by the present invention; Figure 10 is the split diagram of the sequence structure of installation method 2 provided by the present invention; Figure 11 is the schematic diagram when the stop block does not lock the second slider in installation method 2 provided by the present invention; Figure 12 is the schematic diagram when the stop block locks the second slider in installation method 2 provided by the present invention.

[0019] Explanation of reference numerals: 1. First slider; 2. Second slider; 3. First slider insert; 31. First T - shaped part; 4. Second slider insert; 41. Second T - shaped part; 5. Limiting mechanism; 51. Stop block; 52. Spring; 53. Spring fixing seat; 54. Groove inclined plane; 55. Protrusion inclined plane; 56. Guide block; 57. Bottom wear - resistant block; 6. Locking mechanism; 61. Limiting block; 62. Press strip; 63. First groove; 64. Second groove; 65. Third groove; 7. Male mold core; 8. Male mold plate; 9. Upper ejector plate; 10. Lower ejector plate; 11. Lower mold fixing plate; 12. Stop - block through - hole; 13. First stroke S 1 ; 14. Second stroke S 2 ; 15. Product; 16. Oil cylinder; 17. Oil - cylinder pull rod; 18. Stop - block retaining height S 3 ; 19. Stop - block stroke S 4 . Detailed implementation mode

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually illustrative only and in no way limits the present invention and its application or use.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "plurality" is two or more. In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations. Embodiment 1

[0022] This embodiment provides a secondary slider sequential control mechanism, including a slider and an oil cylinder 16. The oil cylinder 16 drives the slider to move. The slider includes a first slider 1 and a second slider 2. Slider inserts are provided at the ends of the first slider 1 and the second slider 2. The slider inserts are used to form barbs on the product 15. The oil cylinder 16 is directly connected to the first slider 1, and the first slider 1 is connected to the second slider 2 through a sequential mechanism; The sequential mechanism includes a limiting mechanism 5 and a locking mechanism 6. The limiting mechanism 5 is used to lock the second slider 2 during the first stroke, and the locking mechanism 6 is used to lock the first slider 1 and the second slider 2 together during the second stroke; Among them, the first stroke is that the oil cylinder 16 drives the first slider 1 to move, and the second stroke is that the oil cylinder 16 drives the first slider 1 and the second slider 2 to move together; after the first stroke is completed, while the limiting mechanism 5 releases the locking of the second slider 2, the locking mechanism 6 locks the first slider 1 and the second slider 2 together.

[0023] As Figure 4 shown, the product 15 is arranged on the male mold core 7, the male mold core 7 and the sequencing mechanism are both installed on the male mold plate 8, the male mold plate 8 is connected to the lower mold fixing plate 11, and an upper ejector pin plate 9 and a lower ejector pin plate 10 are further arranged between the male mold plate 8 and the lower mold fixing plate 11. The upper ejector pin plate 9 and the lower ejector pin plate 10 are used to install the ejector pin mechanism, and the ejector pin mechanism is used to eject the product 15.

[0024] As Figure 1 、 Figure 2 shown, the sequencing control mechanism of the secondary slider provided in this embodiment has two installation methods, namely installation method 1 and installation method 2.

[0025] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 The structure on the right side in shows installation method 1. The volume of the second slider 2 is larger than that of the first slider 1, the first slider 1 is embedded in the second slider 2, the oil cylinder 16 passes through the end of the second slider 2 and is connected to the end of the first slider 1. After the oil cylinder 16 drives the first slider 1 to move a certain distance, the limiting mechanism 5 at the bottom of the second slider 2 is released. At the same time, the locking mechanism 6 locks the first slider 1 and the second slider 2 together, and the oil cylinder 16 continues to drive, and the first slider 1 and the second slider 2 move together. The slider inserts on the first slider 1 and the second slider 2 are separated from the undercut of the product 15 successively, avoiding damage caused by pulling when the undercut is demolded.

[0026] As Figure 1 、 Figure 2 The structure on the left side in shows installation method 2. The volume of the first slider 1 is larger than that of the second slider 2, the second slider 2 is embedded in the first slider 1, the oil cylinder 16 is connected to the end of the first slider 1. The oil cylinder 16 first drives the first slider 1 to move. At this time, the second slider 2 is locked by the limiting mechanism 5 at the bottom. After the first slider 1 moves a certain distance, the limiting mechanism 5 is pressed down to release the locking of the second slider 2. At the same time, the locking mechanism 6 locks the first slider 1 and the second slider 2 together, and the oil cylinder 16 drives the first slider 1 and the second slider 2 to move together. The slider inserts at the ends of the first slider 1 and the second slider 2 away from the oil cylinder 16 are separated from the undercut of the product 15 successively, avoiding damage caused by pulling when the undercut is demolded.

[0027] According to the two different installation methods and the design of the slider insert shape according to the shape of the barb, the barbs of different shapes on the product 15 can be designed. When the first slider 1 is a large slider, the large slider first detaches from the barb of the product 15, and the small slider supports the barb on the product 15 to prevent the product from sticking and sliding when the large slider is opened. It is suitable for deep ribs and column position barbs. When the first slider 1 is a small slider, the small slider first detaches from the slider insert of the large slider, thereby driving the slider insert of the large slider to detach from the barb on the product 15. It is suitable for upper and lower two (multiple) barbs. The two installation methods use barbs of different sizes and distributions, thereby improving the applicability of the mechanism. Embodiment 2

[0028] This embodiment provides a secondary slider sequence control mechanism and installation method 1 based on the first embodiment.

[0029] like Figure 2 , Figure 5 , Figure 6 As shown, the first slider 1 is a small slider, and a first slider insert 3 is provided at the end thereof, and the second slider 2 is a large slider, and a second slider insert 4 is provided at the end thereof. A groove guide rail for mounting the first slider 1 is provided on the second slider 2; the groove guide rail penetrates to the end of the second slider insert 4, and divides the slider insert of the second slider 2 into two parts separated from each other. The first slider 1 is embedded in the groove guide rail, and the first slider insert 3 is located between the two parts separated from each other from each other. like Figure 9 As shown, first T-shaped portions 31 are provided on both sides of the first slider insert 3, and second T-shaped portions 41 are provided on both sides of the second slider insert 4. When the first slider insert 3 is located between the two parts of the second slider insert 4, the first T-shaped portions 31 on both sides are in contact with the second T-shaped portions 41, the first T-shaped portion 31 on one side is embedded in the lower part of the second slider insert 4, and the first T-shaped portion 31 on the other side is embedded in the upper part of the second slider insert 4. The second T-shaped portions 41 on both sides are embedded in the first slider insert 3, the first T-shaped portion 31 is embedded in one side of the lower part, the second T-shaped portion 41 is located above the first T-shaped portion 31, the first T-shaped portion 31 is embedded in one side of the upper part, and the second T-shaped portion 41 is located below the first T-shaped portion 31.

[0030] During one stroke when the mold is opened, the first slider moves away from the product. When the first slider insert 3 moves, it drives the first T-shaped portion 31 thereon to separate from the second slider insert 4. During the separation from the slider insert, the first T-shaped portion 31 on one side drives the lower portion of the second slider insert 4 to move upward, so that the lower portion of the second slider insert 4 separates from the barb at its bottom, and the first T-shaped portion 31 on the other side drives the lower portion of the second slider insert 4 to move downward, so that the upper portion of the second slider insert 4 separates from the barb at its top, so that the second slider separates from the barb of the product first, thereby avoiding product sticking to the film during one demolding.

[0031] As Figure 6 , Figure 7 , Figure 8 shown, the limiting mechanism 5 includes a stop block 51, a spring 52 and a spring fixing seat 53. A convex inclined surface 55 is provided at the end of the stop block 51, and a groove inclined surface 54 is provided at the bottom of the first slider 1. A long strip-shaped stop block through hole 12 penetrating to the bottom of the second slider 2 is provided at the bottom of the groove guide rail. When the second slider 2 moves, it does not affect the stop block 51 passing through the stop block through hole 12 and acting on the first slider 1. One end of the stop block 51 is arranged in the spring fixing seat 53, and the end with the convex inclined surface 55 passes through the stop block through hole 12 and acts on the first slider 1. Limiting protrusions are provided on both sides of the stop block 51, and limiting grooves are provided at the bottom of the second slider 2. The two limiting grooves are respectively located on both sides of the stop block through hole 12. When locking the second slider 2, the groove inclined surface 54 cooperates with the convex inclined surface 55, and the limiting protrusions cooperate with the limiting grooves. When unlocking the second slider 2, they disengage from each other.

[0032] As Figure 2 , Figure 5 , Figure 8 shown, when the first slider 1 completes one stroke S 1 13, the convex inclined surface 55 disengages from the groove inclined surface 54, and the convex inclined surface 55 is located on the flat part at the bottom of the first slider 1. The flat part at the bottom of the first slider 1 presses down the stop block 51. One end of the stop block 51 located in the spring fixing seat 53 is connected to the spring 52. After the stop block 51 is pressed down, the spring 52 is compressed. The limiting protrusions disengage from the limiting grooves at the bottom of the second slider 2.

[0033] The blocking height of the second slider 2 after the limiting protrusions and the limiting grooves cooperate is the stop block blocking height S 3 18 (the height of the limiting protrusion located in the limiting groove). The moving height of the convex inclined surface 55 from the groove inclined surface 54 to the flat part at the bottom of the second slider 2 is the stop block stroke S 4 19. Among them, the stop block blocking height S 3 18 is less than or equal to the stop block stroke S 4 19.

[0034] A bottom wear-resistant block 57 is also provided at the bottom of the second slider 2. The stop block 51 penetrates through the bottom wear-resistant block 57. A guide block 56 is provided at the open end of the spring fixing seat 53. The guide block 56 is sleeved on the stop block 51. The guide block 56 is located below the bottom wear-resistant block 57. The guide block 56 is used for guiding the movement of the stop block 51. The bottom wear-resistant block 57 has wear-resistant characteristics. When the second slider 2 moves, it rubs against the bottom wear-resistant block 57, improving the durability of the device.

[0035] The locking mechanism 6 includes a limiting block 61 and a pressing strip 62. There are two pressing strips 62, which are respectively installed on both sides of the second slider 2. A first groove 63 is formed on the side wall of the pressing strip 62 close to the second slider 2. Third grooves 65 penetrating through to the outer side wall are formed on both side walls of the groove guide of the second slider 2. Second grooves 64 are formed on both side walls of the first slider 1 close to the groove guide. The first groove 63, the second grooves 64 and the second grooves 64 are at the same height and are all slightly larger than the limiting block 61. The limiting block 61 is located in different grooves to realize the locking and unlocking of the first slider 1 and the second slider 2.

[0036] Specifically, when the first slider 1 is in a primary stroke S 1 13, both ends of the limiting block 61 are respectively located in the first groove 63 and the third groove 65. After the first slider 1 completes a primary stroke S 1 13, the three grooves are aligned. One end of the limiting block 61 disengages from the first groove 63 and enters the second groove 64, and the other end enters the second groove 64 to lock the first slider 1 and the second slider 2.

[0037] The cylinder rod 17 on the cylinder 16 passes through the end of the second slider 2 and enters the groove guide to connect with the first slider 1 in the groove guide.

[0038] During mold opening, the limiting groove at the bottom of the second slider 2 cooperates with the limiting protrusion on the stop block 51. The height of the limiting protrusion in the limiting groove is the stop block height S 3 18 to limit the movement of the second slider 2. The first slider 1 is driven by the cylinder 16 at its end and moves away from the product 15 by a primary stroke S 1 13, and the protruding inclined surface 55 on the stop block 51 gradually moves out of the groove inclined surface 54. When the first slider 1 completes a primary stroke S 1 13, the protruding inclined surface 55 completely disengages from the groove inclined surface 54 and is located at the flat part at the bottom of the first slider 1. At the same time, the stop block 51 is pressed down, and the limiting protrusion disengages from the limiting groove. At the same time, the first groove 63, the second grooves 64 and the third groove 65 are aligned. One end of the limiting block 61 disengages from the first groove 63 and is located in the third groove 65, and the other end enters the second groove 64 to lock the first slider 1 and the second slider 2. The first slider 1 moves to the end of the groove guide, and the end surface of the first slider 1 connected to the cylinder rod 17 contacts the inner end surface of the groove guide. The cylinder 16 continues to pull the first slider 1 to move away from the product 15 by a secondary stroke S 2 14. Since the end surface of the first slider 1 contacts the inner end surface of the groove guide, while pulling the first slider 1 to move, the second slider 2 follows the first slider 1 to move until the end surface of the second slider 2 contacts the end surface of the cylinder 16 to complete the secondary stroke S 214. The first slider insert 3 and the second slider insert 4 are completely separated from the product 15, completing the demolding of the undercut on the product 15.

[0039] During mold clamping, the limit block 61 is located in the second groove 64 and the third groove 65, locking the first slider 1 and the second slider 2. When the oil cylinder 16 pushes the first slider 1 towards the product 15, the second slider 2 follows the first slider 1. When the first slider 1 and the second slider 2 complete the reset secondary stroke S 2 14, the second slider insert 4 is in place, and the first groove 63, the second groove 64, and the third groove 65 are aligned. At the same time, the convex inclined surface 55 on the stop enters the groove inclined surface 54 at the bottom of the first slider 1, and the limit protrusions on both sides of the stop are aligned with the limit grooves at the bottom of the second slider 2 and enter the limit grooves to lock the second slider 2. When the oil cylinder 16 continues to push the first slider 1 towards the product 15, one end of the limit block 61 disengages from the second groove 64, and the other end enters the first groove 63. The oil cylinder 16 drives the first slider 1 to move alone in the groove guide of the second slider 2 towards the product 15. When it moves to the farthest distance set by the oil cylinder 16, the first slider insert 3 is in place, completing the reset primary stroke S 1 13.

[0040] Among them, the primary stroke S 1 13 in this embodiment is 30 mm, and the secondary stroke S 2 14 is 20 mm. Embodiment 3

[0041] Based on Embodiment 1, this embodiment provides a secondary slider sequential control mechanism and an installation method 2.

[0042] As Figure 10 、 Figure 11 、 Figure 12 shown, the first slider 1 is a large slider, and the first slider insert 3 is provided at the end. The second slider 2 is a small slider, and the second slider insert 4 is provided at the end. A groove guide is provided inside the first slider 1, and the second slider 2 is embedded in the groove guide. The first slider insert 3 is divided into two spaced-apart upper and lower parts by the groove guide. After the second slider 2 is embedded in the groove guide, the first slider insert 3 is located between the two separated parts of the second slider insert 4. The end of the first slider 1 is connected to the oil cylinder pull rod 17.

[0043] The limiting mechanism 5 includes a stop block 51, a spring 52, and a spring fixing seat 53. The two sides of the stop block 51 are provided with convex inclined surfaces 55, and the bottom of the first slider 1 is provided with a groove inclined surface 54. The bottom of the groove guide rail is also provided with a stop block through hole 12 that penetrates to the bottom of the first slider 1. The groove inclined surface 54 is located on both sides of the stop block through hole 12. One end of the stop block 51 is installed in the spring fixing seat 53, and the other end passes through the stop block through hole 12 and cooperates with the limiting groove at the bottom of the second slider 2, thereby locking the second slider 2. One end of the stop block 51 in the spring fixing seat 53 contacts the spring 52. When the first slider 1 is driven by the oil cylinder 16, the convex inclined surface 55 moves in the groove inclined surface 54 until it moves out of the groove inclined surface 54, pressing down the stop block 51, and the end of the stop block 51 disengages from the limiting groove of the second slider 2, releasing the locking of the second slider 2.

[0044] As Figure 2 , Figure 5 , Figure 12 shown, during the movement of the first slider 1 for one stroke S 1 13, the stop block 51 locks the second slider 2. After completing one stroke S 1 13, the first slider 1 releases the locking of the stop block 51, and the first slider 1 and the second slider 2 continue to move together for a second stroke S 2 14. The distance of one end of the stop block 51 located in the limiting groove is the stop block height S 3 18. During the process of the convex inclined surface 55 moving out of the groove inclined surface 54, the pressing distance of the stop block 51 is the stop block stroke S 4 19, where the stop block height S 3 18 is less than or equal to the stop block stroke S 4 19, ensuring that the locking effect on the second slider 2 can be completely released.

[0045] The locking mechanism 6 includes a limiting block 61 and a pressing strip 62. The two pressing strips 62 are respectively arranged on both sides of the first slider 1. The side of the pressing strip 62 close to the first slider 1 is provided with a first groove 63 with a certain length. The two sides of the first slider 1 are provided with second grooves 64 that penetrate from the side wall opening of the groove guide rail to the outer wall. The two side walls of the second slider 2 are provided with third grooves 65. The length of the third groove 65 is less than that of the first groove 63, and the lengths of the second groove 64 and the third groove 65 are slightly greater than the width of the limiting block 61. By changing the position of the limiting block 61 among the three grooves, the locking and unlocking between the first slider 1 and the second slider 2 are realized.

[0046] The bottom of the first slider 1 is also provided with a bottom wear-resistant block 57. The stop block 51 penetrates through the bottom wear-resistant block 57, and a guide block 56 is also sleeved on the stop block 51. The guide block 56 is located below the bottom wear-resistant block 57. Both the spring fixing seat 53 and the bottom wear-resistant block 57 are installed on the male template 8.

[0047] When the mold is opened, the first slider insert 3 and the second slider insert 4 form the undercuts on the product 15, and the oil cylinder 16 pulls the first slider 1 to move away from the product 15 by a stroke S 1 13. During the stroke S 1 13, the end of the stop block 51 is located in the limit groove at the bottom of the second slider 2 to lock the second slider 2. The convex inclined surfaces 55 on both sides of the stop block 51 are located in the groove inclined surface 54 at the bottom of the first slider 1. As the first slider 1 moves, the convex inclined surface 55 gradually disengages from the groove inclined surface 54, and the stop block 51 is gradually pressed down. When the stroke S 1 13 is completed, the convex inclined surface 55 completely disengages from the groove inclined surface 54 and is located at the flat part at the bottom of the first slider 1. The stop block 51 presses down the stop block by a stroke S 4 19 in the vertical direction, and the end of the stop block 51 completely disengages from the limit groove at the bottom of the second slider 2 to release the lock on the second slider 2. At the same time, the limit block 61 is driven by the first slider 1 to move to the end of the first groove 63, and the first groove 63, the second groove 64, and the third groove 65 are aligned. Since the limit block 61 has moved to the end of the first groove 63, after the first slider 1 and the second slider 2 continue to move, there is no space in the first groove 63 to accommodate the limit block 61, and the limit block 61 is squeezed into the third groove 65 to lock the first slider 1 and the second slider 2 together. At this time, the end face of the second slider 2 is close to the end face of the groove guide rail, and the oil cylinder 16 pulls the first slider 1 and the second slider 2 together to move away from the product 15 by a secondary stroke S 2 14.

[0048] When the mold is closed, the first slider 1 and the second slider 2 move together towards the product 15 to reset by a secondary stroke S 2 14, and then the stop block 51 locks the second slider 2, and the limit block 61 is located in the first groove 63 and the second groove 64. The first slider 1 continues to move towards the product 15 to reset by a stroke S 1 13.

[0049] Among them, the stroke S 1 13 in this embodiment is 30 mm, and the secondary stroke S 2 14 is 20 mm.

[0050] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A secondary slider sequential control mechanism, comprising a slider and a cylinder, wherein the cylinder drives the slider to move, characterized in that: The slider comprises a first slider and a second slider, the ends of the first slider and the second slider are both provided with slider inserts, the slider inserts are used for forming barbs on the product, the oil cylinder is connected to the first slider, and the first slider is connected to the second slider through a sequence mechanism; The sequence mechanism includes a limiting mechanism and a locking mechanism, wherein the limiting mechanism is used to lock the second slider in the first stroke, and the locking mechanism is used to lock the first slider and the second slider together in the second stroke; Among them, the primary stroke is that the cylinder drives the first slider to move, and the secondary stroke is that the cylinder drives the first slider and the second slider to move together; after the primary stroke is completed, the limiting mechanism releases the lock on the second slider, and the locking mechanism locks the first slider and the second slider together.

2. The secondary slider sequential control mechanism according to claim 1, characterized in that: The first slider is located in the groove guide rail on the second slider, the slider insert of the second slider is divided into two parts spaced apart from each other, the slider insert of the first slider is located between the two parts spaced apart from each other, and a long stopper through hole is provided on the groove guide rail, and the stopper through hole is used to enable the limit mechanism to act on the first slider through the limit mechanism; During the one stroke, the first slider moves in the groove guide rail.

3. The secondary slider sequential control mechanism according to claim 2, characterized in that: The slider insert of the first slider is provided with a first T-shaped portion, and the slider insert of the second slider is provided with a second T-shaped portion. When the slider insert of the first slider is located between two parts of the slider insert of the second slider, the first T-shaped portion is in contact with the second T-shaped portion. During one stroke of mold opening, the first T-shaped portion on the slider insert of the first slider drives the upper portion of the slider insert of the second slider to move downward and the lower portion to move upward, so that the slider insert of the second slider is separated from the barb on the product.

4. The secondary slider sequential control mechanism according to claim 1, characterized in that: The second slider is located in the groove guide rail on the first slider, the slider insert of the first slider is divided into two parts spaced apart from each other, the slider insert of the second slider is located between the two parts spaced apart from each other, and a long stopper through hole is provided on the groove guide rail, and the stopper through hole is used to enable the limit mechanism to act on the second slider through the limit mechanism; During the one stroke, the first slider is driven by the oil cylinder, and the second slider moves relative to the first slider in the groove guide rail.

5. The secondary slider sequential control mechanism according to claim 1, characterized in that: The cylinder pull rod of the oil cylinder is connected to an end of the first sliding block away from the sliding block inlet.

6. The secondary slider sequential control mechanism according to claim 1, characterized in that: The limiting mechanism comprises a stop block, a spring, a spring fixing seat, a groove inclined surface arranged at the bottom of the first slider and a limiting groove arranged at the bottom of the second slider, the stop block is provided with a convex inclined surface matched with the groove inclined surface and a limiting protrusion matched with the limiting groove, the spring is arranged in the spring fixing seat, and one end of the stop block is arranged in the spring fixing seat; When the first slider moves once, the stop block is pressed down, the raised inclined surface is separated from the groove inclined surface, and the limiting projection is separated from the limiting groove, thereby releasing the lock on the second slider.

7. The secondary slider sequential control mechanism according to claim 5, characterized in that: The spring mounting seat is also provided with a guide block, and the guide block is used for guiding the stop block when it moves.

8. The secondary slider sequential control mechanism according to claim 1, characterized in that: The locking mechanism comprises a limit block, a pressure strip, a first groove arranged on the pressure strip, a second groove arranged on the first slider and a third groove arranged on the second slider, wherein the pressure strip is installed on both sides of the slider; When the first sliding block performs one stroke, one end of the limit block is located in the first groove, and the other end is located in the second groove or the third groove; When the first sliding block performs a secondary stroke, both ends of the limit block are located in the second groove and the third groove respectively.

9. The secondary slider sequential control mechanism according to claim 1, characterized in that: It also includes a male mold core, a male mold plate, an upper ejector plate, a lower ejector plate and a lower mold fixing plate. The product is arranged on the male mold core. The male mold core, the sequence mechanism and the slider are all installed on the male mold plate. A wear-resistant block is arranged between the slider and the male mold plate. The male mold plate is installed on the lower mold fixing plate. An ejector plate is also arranged between the male mold plate and the lower mold fixing plate. The ejector plate is connected with an ejector mechanism, and the ejector mechanism is used to eject the product.

10. A method for operating a secondary slider sequential control mechanism, characterized in that: The method is implemented by using the secondary slider sequence control mechanism according to any one of claims 1 to 9, comprising the following steps: When the mold is opened, the oil cylinder drives the first slider to move a stroke S1 in the direction away from the product, and the slider insert of the first slider is separated from the barb on the product. The locking mechanism locks the first slider and the second slider, and the limit mechanism releases the lock on the second slider. The oil cylinder drives the first slider and the second slider to move a second stroke S2 ​​in the direction away from the product, and the slider insert on the second slider is separated from the barb on the product. When the mold is closed, the first slider and the second slider are locked together by the locking mechanism, the oil cylinder drives the first slider and the second slider to reset and move to the product direction for a second stroke S2, the slider of the second slider is put into place, the second slider is locked by the limit mechanism, the oil cylinder drives the first slider to reset and move to the product direction for a stroke S1, and the slider of the first slider is put into place; When the first slider is locked, the stop block in the locking mechanism blocks the slider to a stop block stop height S3, and when a stroke S1 is completed, the vertical movement distance of the stop block is a stop block stroke S4; Wherein, S4 is greater than or equal to S3.

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