Adjustable direct pressure center mold locking structure

Abstract

The utility model relates to an adjustable direct pressure center mold locking structure which comprises four tiebars, a front mold plate fixedly installed at the front ends of the tiebars and a movable mold plate set installed on the tiebars in a sliding mode, and the movable mold plate set comprises a pressurizing mold plate, a movable mold plate and a fixing nut which are sequentially arranged on the tiebars. A band-type brake structure is arranged between the fixing nut and the tiebar, the rear mold is fixedly installed on the front end face of the pressurizing mold plate, a plurality of pressurizing oil cylinders are fixed to the movable mold plate, pistons of the pressurizing oil cylinders penetrate through the movable mold plate and are fixed to the rear end face of the pressurizing mold plate, the mold locking structure comprises a quick pushing unit, and the quick pushing unit is fixed to the movable mold plate. And the push rod is used for pushing the movable template to move along the tiebar. According to the utility model, one or more small oil cylinders are adopted, so that the cost can be saved, and the plurality of small oil cylinders are distributed in a matrix or a ring shape, so that central mold locking is realized, and the mold locking tension is more uniform; mould opening and closing are conducted through the rapid oil cylinder, the production period is shortened, mould locking is conducted through the pressurizing oil cylinder, and the mould locking effect is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding, in particular to an adjustable direct-pressure center clamping structure. Background Art

[0002] The clamping structure refers to the mechanical structure used to lock the mold in the plastic injection molding machine. During the injection molding process, the injection and molding of the plastic melt are achieved by pressing the mold. Therefore, the clamping structure has a vital impact on the quality and production efficiency of plastic products. There are three common types of clamping structures, namely the crank arm clamping structure, the two-plate clamping structure and the three-plate direct pressure clamping structure. In actual application, the above three clamping structures have their own defects, as follows: (1) The crank arm clamping structure drives the template to move through the crank arm structure. The movement of the crank arm requires a large amount of lubricating oil, which will pollute the working environment. In addition, there is a problem of parallelism imbalance in the crank arm clamping structure. The four clamping cylinders are unevenly stressed and prone to wear. (2) The two-plate clamping mechanism has four clamping cylinders fixed on the clamping cylinders, which cannot achieve center stress, so uneven stress will occur. In addition, the operation of the four clamping cylinders has no guide, which will cause sagging and inaccurate positioning. (3) Three-plate direct pressure clamping structure. The biggest drawback of this structure is that it requires a large oil cylinder and a large load-bearing tail plate. The structure is relatively complex and the equipment cost is high.

[0003] Therefore, there is an urgent need in this field for a clamping structure with uniform force and low cost. Utility Model Content

[0004] The purpose of the present invention is to overcome the defects of the prior art and to provide an adjustable direct pressure center clamping structure.

[0005] In order to achieve the purpose of the present invention, the present application provides the following technical solutions.

[0006] In a first aspect, the present application provides an adjustable direct pressure center clamping structure, the clamping structure comprising four coring posts, a front platen fixedly mounted at the front end of the coring posts, and a moving platen assembly slidably mounted on the coring posts. The front platen is fixedly mounted with a front mold, and the moving platen assembly is fixedly mounted with a rear mold matching the front mold. The moving platen assembly comprises a pressurizing platen, a movable platen, and a fixing nut sequentially arranged on the coring posts. A brake structure is provided between the fixing nut and the coring posts. The rear mold is fixedly mounted on the front end face of the pressurizing platen. A pressurizing cylinder unit is fixed on the movable platen. The piston of the pressurizing cylinder unit penetrates the movable platen and is fixed to the rear end face of the pressurizing platen. The clamping structure comprises a quick push unit, which is fixed to the movable platen and is used to push the movable platen to move along the coring posts. During operation, the quick push unit first pushes the movable platen to move, thereby driving the pressurizing platen, fixing nut, pressurizing cylinder, and other components to move together until the front mold and the rear mold approach or abut. This allows for rapid mold closing. Then, the fixing nut is used to hold the coring column, so that the movable platen cannot move in the opposite direction. Then the booster platen is pushed by the booster cylinder unit to generate sufficient pressure between the front mold and the rear mold, and the injection molding begins.

[0007] In one embodiment of the first aspect, the plurality of boosting cylinders are arranged in an array or ring around the center of the boosting platen. This arrangement enables the clamping structure of the present application to be centrally clamped, and the pressure on the boosting platen is more evenly distributed.

[0008] In one embodiment of the first aspect, the boosting cylinder unit includes a boosting cylinder, and a plurality of boosting rods are fixed to the front end of the boosting cylinder piston of the boosting cylinder. The boosting rods penetrate the dynamic template and are fixed to the rear end face of the boosting template, and all the boosting rods are arranged as follows: with the center of the boosting template as the center, the plurality of boosting rods are distributed in an array or ring shape. When a multi-cylinder form is adopted, each boosting cylinder only needs to use a small cylinder, which greatly saves costs. However, in the multi-cylinder form, there will still be slight thrust differences between different boosting cylinders. Therefore, a one-cylinder and multiple-rod form can be selected, that is, a boosting cylinder is used to push multiple boosting rods, and then push the boosting template to ensure that the thrust of each boosting rod is the same, ensuring center locking.

[0009] In this application, the booster cylinder unit can be in the form of multiple cylinders or one cylinder and multiple rods, but it is necessary to ensure that the thrust center of the booster cylinder unit is located at the center of the booster template to achieve center clamping and make the clamping force more uniform.

[0010] A preferred brake structure is as follows: the Corinthian column is evenly and intermittently provided with a plurality of snap rings along its axial direction, each snap ring including a plurality of protrusions, the protrusions being evenly and spaced apart around the axis of the Corinthian column, and the straight line connecting the corresponding protrusions on any two adjacent Corinthian columns being parallel to the axis of the Corinthian column; the fixing nut is in the form of a swing gate nut, which is sleeved on the outside of the Corinthian column, and the inner wall of the swing gate nut is provided with an inner groove that matches the snap ring. When the protrusions on the inner wall of the fixing nut correspond to the positions of the grooves on the snap ring, the swing gate nut can move axially along the Corinthian column; when the swing gate nut is rotated a certain angle, and the protrusions on the inner wall of the swing gate nut correspond to the positions of the protrusions on the snap ring, the swing gate nut cannot continue to move axially along the Corinthian column, thus achieving axial fixation.

[0011] In one embodiment of the first aspect, the brake structure includes a rotary brake cylinder fixed to the rear end face of the movable template and a pressure plate fixed to the rotary brake cylinder, the pressure plate is parallel to the rear end face of the movable template, one end of the fixing nut is fixed to the pressure plate, and the fixing nut is arranged perpendicular to the pressure plate.

[0012] Another preferred brake structure is as follows: The brake structure is as follows: The coring post is evenly and intermittently provided with multiple clamping rings along its axial direction. The clamping rings are in the form of complete circular rings. The fixing nut is in the form of a brake nut. The brake nut includes two semi-annular brake pads, and the inner diameter of the brake pads is the same as the outer diameter of the portion between the two clamping rings on the coring post. In this method, when the two brake pads are separated, the distance between them is greater than the outer diameter of the clamping ring, and the axial movement of the entire brake nut along the coring post is not hindered. When the two brake pads approach each other and finally embrace the coring post, their forward and backward movement is blocked by a clamping ring, thereby achieving axial fixation.

[0013] In one embodiment of the first aspect, the brake structure includes a plurality of brake cylinders, which are fixed to the rear end surface of the movable platen, and the brake cylinders are fixed to the brake pads and push the brake pads to move linearly.

[0014] In one embodiment of the first aspect, the rapid-push unit includes a tail platen and a plurality of rapid oil cylinders fixedly mounted on the tail platen, the tail platen being fixedly mounted at the tail end of the coring column, and the front ends of the pistons of the rapid oil cylinders being fixed to the movable platen. Since the rapid oil cylinders used in this application only serve to quickly open and close the mold and do not apply pressure to the mold during injection molding, the rapid oil cylinders do not need to be large and are relatively light. Therefore, the tail platen does not need to have a large load-bearing capacity. A thinner tail platen can be used to secure the rapid oil cylinders, thereby saving the cost of the tail platen.

[0015] In one embodiment of the first aspect, a driven die-adjusting gear is provided on the outer wall of the fast cylinder. A die-adjusting motor and a driving die-adjusting gear are fixed to the tail platen. The die-adjusting motor meshes with the driving die-adjusting gear, and the driving die-adjusting gear meshes with all the driven die-adjusting gears. This structure enables the fast cylinder to move forward and backward along the axis of the column, facilitating the use of molds of varying sizes.

[0016] In one embodiment of the first aspect, a support base is fixed to the bottom of the movable platen, and an adjustment unit is provided on the support base. The adjustment unit is located at the bottom of the booster platen and is used to provide support force to the booster platen in the direction of gravity. This structure provides a vertical upward support force to the booster platen, so that when the booster platen (together with the rear mold) moves, the coring column does not bear the full force of gravity, thereby preventing damage to the coring column.

[0017] In one embodiment of the first aspect, the adjustment unit includes an adjusting sleeve, a tightening screw and a slide plate, the adjusting sleeve is horizontally fixed on the support seat, the tightening screw is vertically arranged in the adjusting sleeve, and the top of the tightening screw abuts against the bottom of the slide plate, and the top of the slide plate abuts against the top of the boost template.

[0018] In one embodiment of the first aspect, the adjustment unit includes a wedge block, the front end of the support seat is provided with a wedge surface, the top of the wedge block abuts against the bottom of the boost template, the bottom of the wedge block is provided with an inclined surface matching the wedge surface on the support seat, and the wedge block and the support seat are installed by bolts and nuts.

[0019] In one embodiment of the first aspect, the mold clamping structure includes an ejector unit secured to the movable platen and extending through the movable platen to abut the pressurized platen and the rear mold. The ejector unit facilitates separation of the molded product from the rear mold after injection molding is complete.

[0020] In one embodiment of the first aspect, the ejector unit includes a plurality of ejector balancing rods, an ejector bracket, an ejector oil cylinder, a push plate, and a plurality of ejector rods, the ejector balancing rods being perpendicular to and fixed to the movable platen or the pressurized platen, the ejector bracket being fixed to the rear end of the ejector balancing rod, the ejector oil cylinder being fixed to the ejector bracket, the push plate being slidably mounted on the ejector balancing rod, the piston of the ejector oil cylinder being fixed to the push plate, the rear end of the ejector rod being fixed to the push plate, and the front end of the ejector rod passing through the movable platen and abutting the pressurized platen and the rear mold.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] (1) The clamping structure of the present invention is distributed in a matrix or ring shape to achieve central clamping, and the clamping force is more uniform.

[0023] (2) Use a fast oil cylinder to open and close the mold to shorten the production cycle. During injection molding, use a pressurized oil cylinder to lock the mold, and the locking effect is guaranteed.

[0024] (3) The fast cylinder can move back and forth, so it is suitable for molds of different sizes and thicknesses, and has a wide range of applicability.

[0025] (4) The tail template does not have a large load-bearing requirement, so a thinner tail template can be used, which can reduce equipment costs.

[0026] (5) The entire clamping structure does not require lubrication during use, which can significantly improve the working environment.

[0027] (6) It is suitable for injection molding process, that is, the mold is closed with low pressure during injection molding, and the pressure is increased after the injection molding is completed to lock the mold, which can solve the stress concentration phenomenon of optical lenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the structure of the clamping structure in Example 1 when the mold is opened;

[0029] Figure 2 Schematic diagram of the structure of the clamping structure in Example 1 when the mold is closed;

[0030] Figure 3 It is a structural diagram of the rear end surface of the moving template;

[0031] Figure 4a is a cross-sectional view of a fixing nut;

[0032] Figure 4b This is a cross-sectional view of a Corinthian column;

[0033] Figure 4c This is a diagram of the loosened state of the Corinthian column and the fixing nut;

[0034] Figure 4d The brake state of the colling post and the fixing nut;

[0035] Figure 5a is a cross-sectional view of another type of fixing nut;

[0036] Figure 5b This is a cross-sectional view of another type of Corinthian column;

[0037] Figure 5c This is a diagram of the loosened state of the Corinthian column and the fixing nut;

[0038] Figure 5d The brake state of the colling post and the fixing nut;

[0039] Figure 6 It is a structural diagram of the booster cylinder;

[0040] Figure 7 It is an enlarged schematic diagram of the structure of a regulating unit;

[0041] Figure 8 It is an enlarged schematic diagram of the structure of another regulating unit;

[0042] Figure 9 This is the structural distribution diagram of the rear end surface of the tail template;

[0043] Figure 10 This is a partial cross-sectional structural diagram of the clamping structure in Example 2;

[0044] Figure 11 This is a structural diagram of the rear end face of the movable template in Example 2.

[0045] In the accompanying drawings, 1 is a Golin column, 2 is a front template, 3 is a dynamic template, 4 is a booster template, 5 is a gate nut, 6 is a tail template, 7 is a front mold, 8 is a rear mold, 9 is a fast oil cylinder, 10 is a fast oil cylinder piston, 11 is a mold adjustment motor, 12 is a driven mold adjustment gear, 13 is a positioning sleeve, 14 is an active mold adjustment gear, 15 is a clamping ring, 16 is a pressure plate, 17 is an ejector cylinder, 18 is an ejector bracket, 19 is an ejector balance rod, 20 is an ejector rod, 21 is a push plate, 22 is a support seat, 23 is an installation Install the screws, 24 is the adjusting screw sleeve, 25 is the tightening screw, 26 is the slide plate, 27 is the locking nut, 28 is the booster cylinder, 29 is the booster cylinder piston, 30 is the fixing bolt, 31 is the swing brake cylinder, 32 is the first protrusion, 33 is the first groove, 34 is the second protrusion, 35 is the second groove, 36 is the brake plate, 37 is the mounting bolt, 38 is the wedge block, 39 is the adjusting bolt, 41 is the support wheel, 42 is the booster rod, 43 is the cylinder fixing bolt, 44 is the casting bracket, and 45 is the brake nut. DETAILED DESCRIPTION

[0046] Unless otherwise defined, technical or scientific terms used in this specification and claims shall have the ordinary meanings understood by persons having ordinary skill in the art to which this invention belongs. All numerical values ​​listed herein, from the lowest value to the highest value, refer to all numerical values ​​obtained by incrementing the lowest value to the highest value by one unit when the difference between the lowest value and the highest value is two units or more.

[0047] The following describes specific embodiments of the present invention. It should be noted that, in the context of describing these embodiments, for the sake of brevity and clarity, this specification does not exhaustively describe all features of the actual embodiments. Those skilled in the art may modify and replace the embodiments of the present invention without departing from the spirit and scope of the present invention, and the resulting embodiments are also within the scope of protection of the present invention.

[0048] Example

[0049] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process. However, the protection scope of the present invention is not limited to the following embodiment.

[0050] Example 1

[0051] An adjustable multi-cylinder direct pressure center clamping structure, its structure is as follows Figure 1 、 Figure 2 As shown, in order to show each component more clearly, Figure 1 The structure diagram of the pressure regulating cylinder is omitted. Figure 2 The structural diagram of the ejector unit is omitted in the figure, and for the convenience of description, the left side is described as the back and the right side is described as the front, as follows.

[0052] The clamping structure comprises four parallel corrugated bars 1, with a front platen 2 secured to the front ends of the bars by locking nuts 27. A tail platen 6 is secured to the rear ends of the bars. A booster platen 4, a movable platen 3, and a swing nut 5 are slidably mounted in the middle of the bars. These three elements are arranged in order from front to back. A front mold 7 is secured to the center of the rear end of the front platen 2, while a rear mold 8 is secured to the center of the front end of the booster platen 4. The front and rear molds 7 and 8 mate with each other.

[0053] Four booster cylinders 28 and one ejector unit are installed on the rear end face of the moving plate 3. Figure 3 As shown, the structure of the booster cylinder 28 is as follows Figure 6 As shown, specifically, the four booster cylinders 28 are fixed to the rear end surface of the dynamic platen 3 by mounting bolts 37, and the distribution of the four booster cylinders 28 is centered on the center of the booster platen 4 and is distributed in a matrix. The front end of the booster cylinder piston 29 penetrates the dynamic platen 3 and is fixed to the booster platen 4 by fixing bolts 30, as shown in FIG. Figure 2 The ejector unit includes a plurality of ejector balancing rods 19, an ejector bracket 18, an ejector cylinder 17, a push plate 21 and a plurality of ejector rods 20, as shown. Figure 1As shown, the ejector balancing rod 19 is perpendicular to and fixed to the dynamic template 3, and the ejector bracket 18 is in the shape of a four-pointed star. Figure 3 As shown, the ejector bracket 18 is fixed to the rear end of the ejector balance rod 19, the ejector cylinder 17 is fixed on the ejector bracket 18, the push plate 21 is slidably installed on the ejector balance rod 19, and the ejector cylinder piston of the ejector cylinder 17 is fixed to the push plate 21, the rear end of the ejector rod 20 is fixed to the push plate 21, and the front end of the ejector rod 20 passes through the movable template 3 and the booster template 4 and abuts against the rear mold 8, which is used to demold the injection molded product from the rear mold 8.

[0054] exist Figure 1 、 Figure 2 In the clamping structure shown, the structure of the coring column 1 and the lock nut 5 is as follows Figure 4a to Figure 4d As shown, a plurality of snap rings 15 are uniformly and discontinuously provided on the Corinthian column 1 along its axial direction, and each snap ring 15 includes a plurality of first protrusions 32 ( Figure 4b (In the example, six first protrusions 32 are used as an example), all first protrusions 32 are evenly and spaced apart around the axis of the Corinthian column 1, that is, a first groove 33 is provided between two first protrusions 32. The straight line connecting the corresponding first protrusions 32 on any two adjacent Corinthian columns 1 is parallel to the axis of the Corinthian column 1. The inner wall of the lock nut 5 is provided with a second protrusion 34 and a second groove 35, as shown in FIG. Figure 4a As shown, the second protrusion 34 matches the shape of the first groove 33, and the second groove 35 matches the shape of the first protrusion 32. When the second protrusion 34 on the inner wall of the lock nut 5 corresponds to the position of the second groove 35 on the clamping ring 15, the first protrusion 32 also corresponds to the position of the second groove 35, so that the lock nut 5 can move axially along the Corinthian column 1. Figure 4c When the lock nut 5 rotates a certain angle, the second protrusion 34 on the inner wall of the lock nut 5 corresponds to the position of the first protrusion 32 on the clamping ring 15, and the lock nut 5 cannot continue to move along the axial direction of the Corinthian column 1. Figure 4d As shown, the axial fixation is achieved. Under this structure, it is necessary to equip the rear end face of the movable template 3 with a rotary cylinder 31, as shown in FIG. Figure 3 As shown, specifically, the swing brake cylinder 31 is fixedly installed on the dynamic platen 3, and the piston of the swing brake cylinder 31 is fixed with a pressure plate 16, which is also sleeved on the outside of the coring column 1. One end of the swing brake nut 5 is fixed on the pressure plate 16, and the swing brake nut 5 and the pressure plate 16 are arranged perpendicularly. When the piston of the swing brake cylinder 31 undergoes linear expansion and contraction, the pressure plate 16 will rotate slightly, thereby driving the swing brake nut 5 to rotate, and the state of the swing brake nut 5 and the coring column 1 can be adjusted. Figure 4c and Figure 4d Switch between them.

[0055] In addition to the above structure, the structure of the Corinthian column 1 and the fixing nut can also be as follows Figure 5a to Figure 5dAs shown, the Corinthian column 1 is evenly and discontinuously provided with a plurality of clamping rings 15 along its axial direction. The clamping rings 15 are in the form of a complete circular ring. The fixing nut is in the form of a brake nut 45. The brake nut 45 includes two semi-annular brake pads 36. The inner diameter of the brake pads 36 is the same as the outer diameter of the portion between the two clamping rings 15 on the Corinthian column 1. When the two brake pads 36 are pushed toward the Corinthian column 1, the brake pads 36 hold the portion between the two clamping rings 15, thereby holding the Corinthian column 1. Figure 5d As shown, since the front and rear ends of the brake pad 36 are supported by the clamping ring 15, the brake nut 45 cannot move along the axial direction of the coring column 1, thus achieving axial fixation. In this form, the two brake pads 36 need to be equipped with a number of brake cylinders (not shown in the figure), which can drive the two brake pads 36 to move toward or in the opposite direction, thereby achieving the state of the brake nut 45 and the coring column 1. Figure 5c and Figure 5d Switch between them.

[0056] Two fast oil cylinders 9 are fixed on the tail plate 6. Figure 1 、 Figure 2 as well as Figure 9 As shown, a mold adjustment motor 11 and a support wheel 41 are fixed to the tail plate 6. An active mold adjustment gear 14 is fixedly mounted on the support wheel 41, and the mold adjustment motor 11 and the active mold adjustment gear 14 are meshed. A driven mold adjustment gear 12 is provided on the outer wall of the cylinder body of the fast oil cylinder 9, and the cylinder body of the fast oil cylinder 9 penetrates the tail plate 6. A positioning sleeve 13 is provided on the front end face of the tail plate 6. The positioning sleeve 13 has a thread that matches the driven mold adjustment gear 12. On the one hand, it is used to fix the fast oil cylinder 9. On the other hand, when the fast oil cylinder 9 rotates, the cooperation between the driven mold adjustment gear 12 and the thread can realize the forward or backward movement of the fast oil cylinder 9 as a whole, similar to the principle of a screw. The active mold adjustment gear 14 meshes with the driven mold adjustment gears 12 on the cylinder bodies of the two fast oil cylinders 9. The front end of the fast oil cylinder piston 10 is fixed to the movable plate 3.

[0057] A support base 22 is provided at the bottom of the movable template 3, and the support base 22 is fixed to the movable template 3 by installing screws 23. An adjusting screw sleeve 24 is fixed to the front end of the support base 22, and a tightening screw 25 is screwed in the adjusting screw sleeve 24. The tightening screw 25 is vertically arranged, and a slide plate 26 is provided at the upper end of the tightening screw 25. The top of the slide plate 26 abuts against the bottom of the supercharged template 4, as shown in FIG. Figure 7 This structure is to provide a vertical upward support force to the pressurized template 4 so that when the pressurized template 4 (together with the rear mold 8) moves, the Corinthian column 1 will not bear all the gravity, thus avoiding damage to the Corinthian column 1.

[0058] The above structure can also be adopted as Figure 8The structure shown is as follows: The front end of the support base 22 is provided with a wedge-shaped surface, and a wedge-shaped block 38 is installed to match the wedge-shaped surface. Its top is horizontal and abuts the bottom of the supercharged plate 4. The bottom of the wedge block 38 has an inclined surface that matches the wedge-shaped surface on the support base 22. When the wedge block 38 moves backward, the supercharged plate 4 is raised; conversely, when the wedge block 38 moves forward, the supercharged plate 4 is lowered. After adjusting to the appropriate height, the wedge block 38 is fixed to the support base 22 with an adjusting bolt 39 to prevent it from moving forward, thereby ensuring a stable support force for the supercharged plate 4.

[0059] The working principle of the adjustable multi-cylinder direct pressure center clamping structure is as follows:

[0060] (1) According to the injection molded product, select the appropriate front mold 7 and rear mold 8, and install them on the front template 2 and the boost template 4 respectively.

[0061] (2) Since the sizes of the front molds 7 and the rear molds 8 are different, the position of the fast cylinder 9 is adjusted according to the sizes of the front molds 7 and the rear molds 8. Specifically, the pneumatic adjustment motor drives the active mold adjustment gear 14 to rotate, and then drives the driven mold adjustment gear 12 to rotate, thereby realizing the overall forward and backward movement of the fast cylinder 9 until the fast cylinder 9 reaches the appropriate position.

[0062] (3) Start the quick cylinder 9, and the quick cylinder piston 10 pushes the dynamic template 3 to move forward, thereby driving the booster template 4, the screw lock nut 5, the booster cylinder 28 and other components to move forward together until the rear mold 8 and the front mold 7 are close to or abutted, and the quick cylinder 9 is closed.

[0063] (4) Start the swing gate oil cylinder 31 so that the swing gate nut 5 holds the Corinthian column 1, making the swing gate nut 5 unable to move on the Corinthian column 1 and ensuring that the movable plate 3 does not move backward.

[0064] (5) The boost cylinder 28 is turned on, and the boost cylinder piston 29 pushes the boost template 4 forward, so that the rear mold 8 abuts against the front mold 7 with sufficient pressure, and the injection molding begins.

[0065] (6) After the injection molding is completed, the booster cylinder 28 stops running and the pressure between the rear mold 8 and the front mold 7 is released.

[0066] (7) Start the rotary brake cylinder 31 to loosen the rotary brake nut 5 and the coring column 1, and then start the quick cylinder 9 to drive the dynamic plate 3 to move backward, driving the rear mold 8, the booster plate 4, the rotary brake nut 5, the booster cylinder 28 and other components to move backward together, and the rear mold 8 is separated from the front mold 7.

[0067] (8) Start the ejector cylinder 17, and the ejector cylinder piston pushes the push plate 21, thereby driving the ejector rod 20 to move forward. The ejector rod 20 pushes the injection molded product out of the rear mold 8, completing one operation.

[0068] Example 2

[0069] The structure is similar to that of Example 1, that is, the same Corinthian column, front template, booster template, tail template, front mold, rear mold, fast oil cylinder, ejector cylinder, and fixed nut are used. The working principle is basically the same. The difference is that in this embodiment, a large booster oil cylinder 28 is fixedly installed on the rear end face of the movable template 3, such as Figure 10 、 Figure 11 To make the drawings clearer, Figure 10 The front mold, rear mold, ejector cylinder, quick cylinder and other structures are omitted. The details are as follows:

[0070] Four casting brackets 44 are vertically mounted on the rear end of the movable platen 3. The booster cylinder 28 is fixedly connected to these brackets via several cylinder fixing bolts 43. By controlling the length of these brackets 44, contact between the booster cylinder 28 and the ejector cylinder can be avoided. Four booster rods 42 are fixed to the front end of the booster cylinder piston 29. The front ends of these four booster rods penetrate the movable platen 3 and are fixed to the booster platen 4. These four booster rods are arranged in an array, centered around the center of the booster platen 4.

[0071] The above description of the embodiments is intended to facilitate understanding and application of the present application by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without expending any creative effort. Therefore, the present application is not limited to the embodiments described herein, and improvements and modifications made by those skilled in the art based on the disclosure of this application without departing from the scope and spirit of this application are within the scope of this application.

Claims

1. An adjustable direct pressure center clamping structure, comprising four Corinthian columns, a front template fixedly mounted at the front end of the Corinthian columns, and a moving template group slidably mounted on the Corinthian columns, wherein a front mold is fixedly mounted on the front template, and a rear mold matching the front mold is fixedly mounted on the moving template group, characterized in that: The moving template group includes a boosting template, a movable template and a fixing nut which are sequentially arranged on the Corinthian column. A brake structure is provided between the fixing nut and the Corinthian column. The rear mold is fixedly mounted on the front end face of the boosting template. A boosting cylinder unit is fixed on the movable template. The piston of the boosting cylinder unit penetrates the movable template and is fixed to the rear end face of the boosting template. The locking structure includes a quick-push unit, which is fixed to the movable template and is used to push the movable template to move along the Corinthian column.

2. The adjustable direct pressure center clamping structure according to claim 1, characterized in that: The boosting cylinder unit includes a plurality of boosting cylinders, and the arrangement of the plurality of boosting cylinders is as follows: with the center of the boosting template as the center, the plurality of boosting cylinders are distributed in an array or ring shape.

3. The adjustable direct pressure center clamping structure according to claim 1, characterized in that: The booster cylinder unit includes a booster cylinder, and multiple booster rods are fixed to the front end of the booster cylinder piston of the booster cylinder. The booster rods penetrate the dynamic template and are fixed to the rear end face of the booster template, and all the booster rods are arranged as follows: with the center of the booster template as the center, multiple booster rods are distributed in an array or ring shape.

4. The adjustable direct pressure center clamping structure according to claim 1, characterized in that: The brake structure is as follows: The Corinthian column is provided with a plurality of snap rings uniformly and discontinuously along its axial direction, each snap ring comprising a plurality of protrusions, the protrusions being uniformly and spaced apart around the axis of the Corinthian column, and a straight line connecting corresponding protrusions on any two adjacent Corinthian columns is parallel to the axis of the Corinthian column; The fixing nut is in the form of a screw nut, the screw nut is sleeved on the outside of the corinth column, and the inner wall of the screw nut is provided with an inner groove matching the clamping ring.

5. The adjustable direct pressure center clamping structure according to claim 4, characterized in that: The brake structure includes a swing brake cylinder fixed to the rear end face of the movable plate and a pressure plate fixed to the swing brake cylinder, the pressure plate is parallel to the rear end face of the movable plate, one end of the fixing nut is fixed to the pressure plate, and the fixing nut is arranged perpendicular to the pressure plate.

6. The adjustable direct pressure center clamping structure according to claim 1, characterized in that: The brake structure is as follows: The Corinthian column is provided with a plurality of clamping rings evenly and discontinuously along its axial direction. The clamping ring is a complete circular ring. The fixing nut is in the form of a brake nut. The brake nut includes two semi-annular brake pads, and the inner diameter of the brake pad is the same as the outer diameter of the part between the two clamping rings on the Corinthian column.

7. The adjustable direct pressure center clamping structure according to claim 6, characterized in that: The brake structure includes a plurality of brake cylinders, which are fixed to the rear end surface of the movable platen. The brake cylinders are fixed to the brake pads and push the brake pads to move linearly.

8. The adjustable direct pressure center clamping structure according to claim 1, characterized in that: The quick push unit includes a tail plate and several quick oil cylinders fixedly installed on the tail plate. The tail plate is fixedly installed on the tail end of the Corinthian column. The front end of the piston of the quick oil cylinder is fixed to the moving plate.

9. The adjustable direct pressure center clamping structure according to claim 8, characterized in that: A driven mold adjusting gear is provided on the outer wall of the cylinder body of the fast oil cylinder. A mold adjusting motor and an active mold adjusting gear are fixed on the tail plate. The mold adjusting motor is engaged with the active mold adjusting gear, and the active mold adjusting gear is engaged with all the driven mold adjusting gears.

10. The adjustable direct pressure center clamping structure according to claim 1, characterized in that: A support seat is fixed to the bottom of the movable template, and an adjustment unit is provided on the support seat. The adjustment unit is located at the bottom of the supercharged template, and the adjustment unit is used to provide support force to the supercharged template in the direction of gravity.

11. The adjustable direct pressure center clamping structure according to claim 10, characterized in that: The adjustment unit includes an adjusting screw sleeve, a tightening screw and a slide plate. The adjusting screw sleeve is horizontally fixed on the support seat, the tightening screw is vertically arranged in the adjusting screw sleeve, and the top of the tightening screw abuts against the bottom of the slide plate, and the top of the slide plate abuts against the top of the boosting template.

12. The adjustable direct pressure center clamping structure according to claim 10, characterized in that: The adjustment unit includes a wedge block, the front end of the support seat is provided with a wedge surface, the top of the wedge block abuts against the bottom of the boost template, the bottom of the wedge block is provided with an inclined surface matching the wedge surface on the support seat, and the wedge block and the support seat are installed by bolts and nuts.

13. The adjustable direct pressure center clamping structure according to claim 1, characterized in that: The clamping structure includes an ejector unit, which is fixed on the movable template and passes through the movable template to abut against the booster template and the rear mold.

14. The adjustable direct pressure center clamping structure according to claim 13, characterized in that: The ejector unit includes a plurality of ejector balancing rods, an ejector bracket, an ejector oil cylinder, a push plate and a plurality of ejector rods. The ejector balancing rod is perpendicular to and fixed to the movable platen or the pressurized platen, the ejector bracket is fixed to the rear end of the ejector balancing rod, the ejector oil cylinder is fixed to the ejector bracket, the push plate is slidably mounted on the ejector balancing rod, and the piston of the ejector oil cylinder is fixed to the push plate, the rear end of the ejector rod is fixed to the push plate, and the front end of the ejector rod passes through the movable platen and abuts against the pressurized platen and the rear mold.

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