Adjustable direct pressure center mold locking structure

Abstract

The invention 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 mold locking structure, one or more small oil cylinders are adopted, the cost can be saved, the multiple small oil cylinders are distributed in a matrix or annular mode, center mold locking is achieved, and the mold locking pulling force 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 invention relates to the technical field of injection molding, and in particular to an adjustable direct-pressure central mold locking 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 is 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 practical applications, 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 unbalanced parallelism in the crank arm clamping structure. The four coring columns are unevenly stressed and prone to wear. (2) The two-plate clamping mechanism has four clamping cylinders fixed on the coring columns, which cannot achieve center stress, so uneven stress will occur. In addition, the operation of the four clamping cylinders is not guided, 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 mold plate. The structure is relatively complex and the equipment cost is high.

[0003] Therefore, there is an urgent need in the art for a clamping structure with uniform force and low cost. Summary of the invention

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

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

[0006] In the first aspect, the present application provides an adjustable direct pressure center clamping structure, the clamping structure includes 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, the front template is fixedly mounted with a front mold, the moving template group is fixedly mounted with a rear mold matching the front mold, the moving template group includes a boosting template, a moving template and a fixing nut sequentially arranged on the Corinthian columns, a brake structure is provided between the fixing nut and the Corinthian columns, the rear mold is fixedly mounted on the front end face of the boosting template, a boosting oil cylinder unit is fixed on the moving template, the piston of the boosting oil cylinder unit penetrates the moving template and is fixed to the rear end face of the boosting template, the clamping structure includes a quick push unit, the quick push unit is fixed to the moving template, and is used to push the moving template to move along the Corinthian columns. When working, the moving template is first pushed to move by the quick push unit, thereby driving the boosting template, the fixing nut, the boosting oil cylinder and other components to move together until the front mold and the rear mold are close to or abutted, so that rapid mold closing can be achieved. 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 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 arranged in an array or annularly. This arrangement makes the clamping structure of the present application a central clamping structure, and the boosting template is subjected to a more uniform force.

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

[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 tension more uniform.

[0010] A preferred brake structure is as follows: the coring column is evenly and discontinuously provided with a plurality of clamping rings along its axial direction, each clamping ring includes a plurality of protrusions, the protrusions are evenly and spaced around the axis of the coring column, and the straight line connecting the corresponding protrusions on any two adjacent coring columns is parallel to the axis of the coring column; the fixing nut is in the form of a swing gate nut, the swing gate nut is sleeved on the outside of the coring column, and the inner wall of the swing gate nut is provided with an inner groove matching the clamping ring. When the protrusion on the inner wall of the fixing nut corresponds to the position of the groove on the clamping ring, the swing gate nut can move along the axial direction of the coring column; when the swing gate nut is rotated by a certain angle, when the protrusion on the inner wall of the swing gate nut corresponds to the position of the protrusion on the clamping ring, the swing gate nut cannot continue to move along the axial direction of the coring column, thus achieving axial fixation.

[0011] In one embodiment of the first aspect, the brake structure includes a swing brake cylinder fixed to the rear end face of the movable template and a pressure plate fixed to the swing 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: A plurality of clamping rings are evenly and discontinuously provided on the coring column 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 pads is the same as the outer diameter of the portion between the two clamping rings on the coring column. In this manner, when the two brake pads are separated, the distance between the two is greater than the outer diameter of the clamping ring, and the entire brake nut will not be hindered from moving axially along the coring column. When the two brake pads approach each other and finally hold the coring column, their forward and backward movements will be blocked by a clamping ring, thereby achieving axial fixation.

[0013] In an implementation manner of the first aspect, the brake structure includes a plurality of brake cylinders, wherein the brake cylinders 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.

[0014] In one embodiment of the first aspect, the quick push unit includes a tail plate and a plurality of quick oil cylinders fixedly mounted on the tail plate, the tail plate is fixedly mounted on the tail end of the coring column, and the front end of the piston of the quick oil cylinder is fixed to the moving plate. Since the quick oil cylinder used in the present application only plays the role of quickly opening and closing the mold and does not pressurize the mold during injection molding, the quick oil cylinder does not need to be large and is also light in weight, so the tail plate does not need to have a large load-bearing capacity, and a thinner tail plate can be selected to fix the quick oil cylinder, which can save the cost of the tail plate.

[0015] In one embodiment of the first aspect, a driven mold adjustment gear is provided on the outer wall of the cylinder body of the fast oil cylinder, a mold adjustment motor and an active mold adjustment gear are fixed on the tail plate, the mold adjustment motor is meshed with the active mold adjustment gear, and the active mold adjustment gear is meshed with all the driven mold adjustment gears. This structure is to enable the fast oil cylinder to move forward and backward in the axial direction of the coring column, so as to be suitable for molds of different sizes.

[0016] In one embodiment of the first aspect, a support seat is fixed at 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 boosting template, and the adjustment unit is used to provide a support force to the boosting template in the direction of gravity. This structure is to provide a vertical upward support force to the boosting template, so that when the boosting template (together with the rear mold) moves, the Corinthian column will not bear all the gravity, thereby avoiding damage to the Corinthian column.

[0017] In one embodiment of the first aspect, the adjusting 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.

[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 locking structure includes an ejector unit, which is fixed to the movable mold plate, and passes through the movable mold plate and the booster mold plate to abut against the rear mold. The function of the ejector unit is to facilitate the separation of the injection molded product from the rear mold after the injection molding is completed.

[0020] In one embodiment of the first aspect, the ejector unit includes a plurality of ejector balance rods, an ejector bracket, an ejector cylinder, a push plate, and a plurality of ejector rods, the ejector balance rod is perpendicular to and fixed to a movable platen or a pressurizing platen, the ejector bracket is fixed to a rear end of the ejector balance rod, the ejector cylinder is fixed to the ejector bracket, the push plate is slidably mounted on the ejector balance rod, and a piston of the ejector cylinder is fixed to the push plate, a rear end of the ejector rod is fixed to the push plate, and a front end of the ejector rod passes through the movable platen and the pressurizing platen to abut against the rear mold.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

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

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

[0024] (3) The fast cylinder can move forward and backward, 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 at low pressure during injection molding, and the mold is locked at increased pressure after injection molding is completed, which can solve the problem of stress concentration in optical lenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of the mold locking structure in Example 1 when the mold is opened;

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

[0030] Figure 3 It is a structural schematic 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 the diagram of the loosened state of the Corinthian column and the fixing nut;

[0034] Figure 4d The brake state of the coring column 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 the diagram of the loosened state of the Corinthian column and the fixing nut;

[0038] Figure 5d The brake state of the coring column and the fixing nut;

[0039] Figure 6 It is a structural schematic 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] Fig. 9 This is the structural distribution diagram of the rear end surface of the tail template;

[0043] Fig.10 It is a partial cross-sectional structural schematic diagram of the clamping structure in Example 2;

[0044] Fig.11 This is a schematic structural diagram of the rear end surface of the moving template in Example 2.

[0045] In the attached drawings, 1 is a coring column, 2 is a front template, 3 is a moving 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 cylinder, 10 is a fast 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 supporting 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, the technical or scientific terms used in this specification and claims shall have the ordinary meanings understood by persons having ordinary skills in the technical field to which the present invention belongs. All the values ​​from the lowest value to the highest value listed herein refer to all the values ​​obtained by incrementing one unit between the lowest value and the highest value when the difference between the lowest value and the highest value is more than two units.

[0047] The specific embodiments of the present invention will be described below. It should be noted that in the specific description of these embodiments, for the sake of concise description, it is impossible for this specification to describe all the features of the actual embodiments in detail. Without departing from the spirit and scope of the present invention, those skilled in the art may modify and replace the embodiments of the present invention, and the resulting embodiments are also within the scope of protection of the present invention.

[0048] Example

[0049] The embodiments of the present invention will be described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0050] Example 1

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

[0052] The clamping structure includes four parallel coring columns 1, and a front mold plate 2 is fixed to the front end of the coring column 1 by a locking nut 27. A tail mold plate 6 is fixed to the rear end of the coring column 1. A booster mold plate 4, a movable mold plate 3 and a swing nut 5 are slidably installed in the middle of the coring column 1, wherein the booster mold plate 4, the movable mold plate 3 and the swing nut 5 are arranged in sequence from front to back. A front mold 7 is fixed to the center of the rear end face of the front mold plate 2, and a rear mold 8 is provided at the center of the front end face of the booster mold plate 4, and the front mold 7 and the rear mold 8 match each other.

[0053] Four booster cylinders 28 and one ejector unit are installed on the rear end surface of the moving plate 3. Figure 3 As shown, the structure of the booster cylinder 28 is as follows Figure 6 Specifically, the four booster cylinders 28 are fixedly mounted on the rear end surface of the dynamic platen 3 by mounting bolts 37, and the four booster cylinders 28 are distributed in a matrix with the center of the booster platen 4 as the center. 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 oil cylinder 17, a push plate 21 and a plurality of ejector rods 20, as shown in FIG. Figure 1As shown, the ejector balance bar 19 is perpendicular to and fixed to the moving plate 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 in FIG. 1 , 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 evenly and discontinuously arranged 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 examples. All the 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 swing nut 5 corresponds to the position of the second groove 35 on the clamping ring 15, the first protrusion 32 can also correspond to the position of the second groove 35, so that the swing nut 5 can move along the axial direction of the coring 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 coring column 1. Figure 4d As shown, the axial fixation is achieved. Under this structure, it is necessary to equip the rear end surface of the moving 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 movable platen 3, and the piston of the swing brake cylinder 31 is fixed with a pressure plate 16, which is also sleeved on the outer side of the coring column 1, and 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 vertically. When the piston of the swing brake cylinder 31 is linearly extended and retracted, 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 to switch between them.

[0055] In addition to the above structure, the structure of the corinth column 1 and the fixing nut can also be as follows Figure 5a to Figure 5dAs shown, a plurality of clamping rings 15 are evenly and discontinuously arranged on the coring column 1 along its axial direction. The clamping ring 15 is in the shape 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, and 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 coring column 1. When the two brake pads 36 are pushed toward the coring column 1, the brake pads 36 hold the portion between the two clamping rings 15, thereby holding the coring column 1, as shown in FIG. 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, and the axial fixation is achieved. 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, so as to achieve the state of the brake nut 45 and the coring column 1. Figure 5c and Figure 5d to switch between them.

[0056] Two fast oil cylinders 9 are fixed on the tail template 6. Figure 1 , Figure 2 as well as Fig. 9 As shown, a mold adjustment motor 11 and a support wheel 41 are fixed on the tail plate 6, and an active mold adjustment gear 14 is fixedly installed 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 surface of the tail plate 6. The positioning sleeve 13 is provided with a thread matching 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 fast oil cylinder 9 can be moved forward or backward as a whole through the cooperation of the driven mold adjustment gear 12 and the thread, which is similar to the principle of a screw. The active mold adjustment gear 14 is meshed 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 moving plate 3.

[0057] A support seat 22 is also provided at the bottom of the movable template 3, and the support seat 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 seat 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 boosting template 4, so that when the boosting 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 seat 22 is provided with a wedge-shaped surface, and a wedge-shaped block 38 matching the wedge-shaped surface is provided, the top of which is horizontal and abuts against the bottom of the supercharged template 4, and the bottom of the wedge-shaped block 38 is provided with an inclined surface matching the wedge-shaped surface on the support seat 22. When the wedge-shaped block 38 moves backward, the supercharged template 4 is raised; conversely, when the wedge-shaped block 38 moves forward, the supercharged template 4 is lowered. After adjusting to a suitable height, the wedge-shaped block 38 is fixed to the support seat 22 by an adjusting bolt 39 to prevent the wedge-shaped block 38 from moving forward, thereby ensuring a stable supporting force for the supercharged template 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 mold plate 2 and the booster mold plate 4 respectively.

[0061] (2) Since the sizes of the front molds 7 and the rear molds 8 are different, the position of the quick 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 quick cylinder 9 until the quick 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 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 cylinder 31 so that the swing nut 5 holds the Corinthian column 1, making the swing nut 5 unable to move on the Corinthian column 1 and ensuring that the movable platen 3 does not move backward.

[0064] (5) The booster cylinder 28 is turned on, and the booster cylinder piston 29 pushes the booster template 4 forward, so that the rear mold 8 abuts against the front mold 7 and has 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 swing cylinder 31 to loosen the swing nut 5 and the coring column 1, then start the quick cylinder 9 to drive the moving plate 3 to move backward, driving the rear mold 8, the booster plate 4, the swing 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) The ejector cylinder 17 is started, 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 coring column, front template, booster template, tail template, front mold, rear mold, fast cylinder, ejector cylinder, and fixing nut are used, and the working principle is basically the same. The difference is that in this embodiment, a large booster cylinder 28 is fixedly installed on the rear end surface of the movable template 3, such as Fig.10 , Fig.11 To make the attached figure clearer, Fig.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 arranged on the rear end face of the moving platen 3, and the booster cylinder 28 is fixedly connected to the casting bracket 44 by a number of cylinder fixing bolts 43. By controlling the length of the casting bracket 44, the booster cylinder 28 can be prevented from contacting the ejector cylinder. Four booster rods 42 are fixed to the front end of the booster cylinder piston 29, and the front ends of the four booster rods penetrate the moving platen 3 and are fixed to the booster platen 4, and the arrangement of the four booster rods is centered on the center of the booster platen 4 and is distributed in an array.

[0071] The above description of the embodiments is to facilitate those of ordinary skill in the art to understand and apply the present application. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without having to pay creative labor. Therefore, the present application is not limited to the embodiments herein, and improvements and modifications made by those skilled in the art based on the contents disclosed in the present application without departing from the scope and spirit of the present application are within the scope of the present application.

Claims

1. An adjustable direct pressure center clamping structure, the clamping structure comprises four coring columns, a front template fixedly mounted at the front end of the coring columns, and a moving template group slidably mounted on the coring columns, a front mold fixedly mounted on the front template, and a rear mold matching the front mold 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 a coring column, a brake structure is provided between the fixing nut and the coring 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, a 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, the quick-push unit is fixed to the movable template and is used to push the movable template to move along the coring column.

2. The adjustable direct pressure center clamping structure according to claim 1, characterized in that: The booster cylinder unit includes a plurality of booster cylinders, and the arrangement of the plurality of booster cylinders is as follows: with the center of the booster template as the center, the plurality of booster cylinders are distributed in an array or in a 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 a plurality of booster rods are fixed to the front end of the booster cylinder piston of the booster cylinder. The booster rods penetrate the moving template and are fixed to the rear end surface of the booster template, and all the booster rods are arranged as follows: with the center of the booster template as the center, the plurality of booster rods are distributed in an array or a ring.

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 evenly and discontinuously provided with a plurality of clamping rings along its axial direction, each clamping ring includes a plurality of protrusions, the protrusions are evenly and spacedly distributed around the axis of the Corinthian column, and the straight line connecting the 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 coring 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 template and a pressure plate fixed to the swing 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.

6. The adjustable direct pressure center clamping structure according to claim 1, characterized in that: The brake structure is as follows: The coring column is provided with a plurality of clamping rings evenly and discontinuously along its axial direction, the clamping ring is in the shape of 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 pads is the same as the outer diameter of the portion between the two clamping rings on the coring 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, and 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 comprises a tail plate and a plurality of quick oil cylinders fixedly mounted on the tail plate, the tail plate is fixedly mounted on the tail end of the coring column, and 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 1, characterized in that: A driven mold adjusting gear is arranged 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 meshed with the active mold adjusting gear, and the active mold adjusting gear is meshed 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 at 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 boosting template, and the adjustment unit is used to provide a supporting force to the boosting template in the gravity direction.

11. The adjustable direct pressure center clamping structure according to claim 10, characterized in that: The adjusting unit comprises an adjusting screw sleeve, a tightening screw and a slide plate, wherein the adjusting screw sleeve is horizontally fixed on the supporting 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 mold plate, and passes through the movable mold plate to abut against the booster mold plate 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 pressurizing 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 pressurizing platen and the rear mold.

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