Rotary flashboard mechanism for injection molding machine

Abstract

The utility model discloses a rotary flashboard mechanism for an injection molding machine, which comprises a rear template, a flashboard and a push rod mounting plate, the middle part of the rear template protrudes to form an annular boss, the flashboard is sleeved on the annular boss and rotates around the axis of the annular boss, and the push rod mounting plate is locked on the annular boss; the push rod mounting plate is provided with at least one mounting hole for assembling the end part of the push rod, and the flashboard is provided with an avoiding area corresponding to the mounting hole, so that the flashboard avoids the mounting hole when rotating to a first state and blocks the mounting hole when rotating to a second state. The push rod end part avoiding and plugging state switching is realized through the gate plate, the push rod on the push rod mounting plate is provided with stroke limit, the push rod end part in the mold locking process is fixed, the hydraulic acting force in the movable mold plate at the other end of the push rod is effectively converted into mold locking force, the structure is simple, the cost is low, and the efficiency is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding equipment technical field, especially a rotating gate mechanism for injection molding machine. BACKGROUND

[0002] At present, the majority of injection molding machine locking mode part adopts toggle lever type mechanism, and the toggle lever type clamping mechanism is a kind of locking mode mechanism most commonly used on current small and medium-sized injection molding machines, and its structural feature (double-toggle) is composed of locking cylinder and two symmetrical toggle link mechanisms, when locking mode, locking cylinder is pushed by high-pressure oil to drive cross head to straighten toggle link, and elastic deformation of system is generated to achieve locking force.

[0003] However, the stress state of toggle lever type locking mechanism is not ideal, since locking force is mainly obtained by deformation of pull rod, too thick and too high rigidity pull rod can cause too steep and sensitive change of force-increasing curve at clamping point, cause clamping difficulty, or locking force is not enough, after long time use, mechanical parts of toggle lever type clamping device, such as column, bearing seat, etc., can be damaged due to abrasion, or clamping force is too high to cause damage of pull rod, pull rod nut, template or toggle pin shaft, and since double-toggle form is adopted, locking stroke design is limited (maximum stroke is toggle straightening state), and it is difficult to be applied to large or long-stroke injection molding equipment.

[0004] Based on the above situation, the inventor develops a new injection molding machine with a novel locking mode form that adopts hydraulic pressure in movable template to provide locking force instead of whole toggle lever type locking mechanism, removes whole toggle locking parts between rear template and movable template, and uses push rod+hydraulic pressure in movable template to push movable template to complete locking mode, on the basis of which, the utility model provides a gate mechanism for locking push rod in locking process to meet the basis of providing locking force. UTILITY MODEL CONTENTS

[0005] In view of one or more of the above problems, the utility model provides a rotating gate mechanism for injection molding machine, which switches the avoidance and plugging state of the gate to the end of the push rod, provides stroke limiting for the push rod on the push rod mounting plate, fixes the end of the push rod in the locking process, ensures that the hydraulic pressure in the movable template at the other end of the push rod is effectively converted into locking force, and has simple structure, low cost and high efficiency.

[0006] To achieve the above purpose, the utility model selects the following technical scheme: a rotating gate mechanism for injection molding machine, comprising rear template, gate and push rod mounting plate, the middle part of the rear template is protruded to form ring boss, the gate is sleeved on the ring boss and rotates around the shaft center of the ring boss, and the push rod mounting plate is locked on the ring boss.

[0007] The push rod mounting plate has at least one mounting hole for mounting the end of the push rod, and the shutter plate is provided with an avoiding area corresponding to the mounting hole, so that the shutter plate avoids the mounting hole when rotated to the first state and blocks the mounting hole when rotated to the second state.

[0008] As a further improvement of the utility model, the telescopic drive is hinged at one end to the rear formwork and at the other end to the edge of the shutter plate, and the telescopic drive is in a state of extension or contraction, which causes the shutter plate to rotate to the first state or the second state correspondingly.

[0009] As a further improvement of the utility model, the telescopic drive is a telescopic oil cylinder or gas cylinder, the rear formwork and the edge of the shutter plate are respectively provided with a first hinge point and a second hinge point, the body end of the telescopic drive is hinged to the first hinge point of the rear formwork, and the telescopic output end of the telescopic drive is hinged to the second hinge point of the shutter plate.

[0010] As a further improvement of the utility model, the top surface of the ring boss is provided with a plurality of screw holes, and the push rod mounting plate is locked on the top surface of the ring boss through a bolt.

[0011] As a further improvement of the utility model, the middle part of the side surface of the push rod mounting plate is provided with a certain amount of annular flange, so that there is a certain amount of gap between the push rod mounting plate and the shutter plate.

[0012] As a further improvement of the utility model, the avoiding area of the shutter plate is an avoiding space formed by the inward recess of the profile edge towards the central axis, and the central axis is coaxially arranged with the axis of the ring boss.

[0013] As a further improvement of the utility model, the shortest distance between the inward recess profile of the avoiding area and the central axis is L1, the shortest distance between the edge of the mounting hole of the push rod mounting plate and the central axis is L2, and L1 < L2.

[0014] As a further improvement of the utility model, the push rod mounting plate has four mounting holes, the shutter plate is provided with four avoiding areas formed by the inward recess of the profile on four sides, and the mounting hole and the avoiding area are staggered or coincided with each other when the shutter plate is rotated to a certain state.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the avoiding and blocking state of the shutter plate on the end of the push rod is switched, the stroke of the push rod on the push rod mounting plate is limited, the end of the push rod in the locking mode is fixed, the hydraulic force in the movable die plate on the other end of the push rod is converted into the locking force, the structure is simple, the cost is low, and the efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions, the following will briefly introduce the drawings needed to be used in the embodiments, obviously, the drawings described in the following are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor under the premise of these drawings.

[0017] Figure 1 The structural schematic diagram of the second state of the rotary locking mechanism of the embodiment.

[0018] Figure 2 The structural schematic diagram of the first state of the rotary locking mechanism of the embodiment.

[0019] Figure 3 The structural schematic diagram of the explosion view of the rotary locking mechanism of the embodiment.

[0020] Figure 4 The structural schematic diagram of the gate plate of the embodiment.

[0021] Figure 5 The structural schematic diagram of part of the injection molding machine. DETAILED DESCRIPTION

[0022] In order to be able to clearly and completely understand the technical solutions, the present application will be further described in conjunction with the embodiments and drawings, obviously, the embodiments recorded are only some embodiments of the present application, and all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0023] It should be understood that when used in the specification and the appended claims, the terms "comprise" and "include" indicate the presence of described features, integers, steps, operations, elements, and / or components, but do not exclude one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0024] It should also be understood that the terms used in the present application specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the present application specification and the appended claims, unless otherwise clearly indicated by the context, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0025] It should be further understood that the term "and / or" used in the present application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0026] This utility model provides a rotary gate mechanism for an injection molding machine. To better understand the inventive concept of this utility model, it is explained that the injection molding machine of this embodiment utilizes the principle of converting hydraulic pressure into clamping force. Specifically, refer to... Figure 5 The injection molding machine includes a front mold plate 10, a moving mold plate 20, and a rear mold plate 300. During mold closing, the mold plate is driven to move by the mold closing power until the mold locking stage. In this embodiment, no restrictions are placed on the operation of the mold plate driven by the above mold closing, and existing technology can be used to achieve this.

[0027] After entering the mold-closing stage, the mold-closing force in this embodiment is provided by the hydraulic force within the moving template 10. One end of the push rod 40 is installed in the hydraulic structure (the end of the push rod is fixed on the piston of the hydraulic structure, that is, the push rod is driven to move by the moving template and / or the hydraulic piston), and the other end is installed on the push rod mounting plate 100 in this embodiment. At this time, the hydraulic force of the moving template 20 exerts a force on the push rod 40 (the moving template drives the push rod to move towards the front template to close the mold. After it is in place, the piston in the hydraulic structure of the moving template moves under the hydraulic force). Therefore, only after the push rod is fixed or limited can the hydraulic force, with the push rod as the support point, react on the moving template 20 and move towards the front template 10 or generate a force to provide the mold-closing force.

[0028] It should be noted that the technical problem to be solved by this utility model is how to lock the ejector rod in the mold clamping process of the injection molding machine, so as not to affect the retraction of the ejector rod when the mold is opened. Therefore, this embodiment does not impose any restrictions on the hydraulic structure of the moving platen and the means by which it generates hydraulic force and acts on the ejector rod and the moving platen. Technicians can set it themselves according to actual usage needs, as long as the moving platen can generate hydraulic force and act on the ejector rod, and when the ejector rod is fixed or limited, it reacts on the moving platen, so that the moving platen forms a clamping force towards the front platen.

[0029] Based on the above description, this embodiment provides a rotary mold-locking mechanism for injection molding machine mold closing to solve the problem of ejector pin limiting. (Refer to...) Figures 1-4 The device includes a rear template 300, a gate plate 200, and a push rod mounting plate 100. The rear template 300 has a central protrusion forming a ring boss 310. The gate plate 200 is sleeved on the ring boss 310 and rotates around the axis of the ring boss. The push rod mounting plate 100 locks the gate plate 200 on the ring boss 310 to restrict the movement of the gate plate 200 in the direction of the ring boss axis.

[0030] The push rod mounting plate 100 has at least one mounting hole 110 for assembling the end of the push rod, and the gate plate 200 has an avoidance area 210 corresponding to the mounting hole 110, so that the gate plate 200, when rotated to the first state (e.g., Figure 2Avoid mounting hole 110 when rotating to the second state (such as the first state) and when rotating to the second state (such as the second state). Figure 1 When the state is such that the mounting hole 110 is blocked.

[0031] In this embodiment, the rotation of the gate plate is used to switch between blocking and avoiding the mounting hole. When the gate plate rotates to the second state, it blocks the mounting hole, causing the end of the push rod to press against the gate plate under force (the rear template is adjusted to a fixed position during injection molding based on mold size, thickness, process, etc., and the position remains unchanged. Since the gate plate is installed on the rear template, its position in the mold closing direction and / or mold opening direction is also fixed. Therefore, when the push rod presses against the gate plate, it means that the end of the push rod is limited or the push rod is fixed). At this time, the moving template at the other end of the push rod generates a hydraulic force. Since the push rod is fixed, the hydraulic force of the moving template acts on itself, causing the moving template to move towards the front template or generate a clamping force. In the mold opening stage after mold closing and injection molding, the moving template first undergoes hydraulic reset. At this time, the push rod is no longer subjected to hydraulic force. Using the rotation of the gate plate, it rotates to the first state, causing the avoidance area of ​​the gate plate to coincide with the mounting hole. As the moving template moves backward, the push rod passes through the avoidance area and the through hole reserved in the rear template from the mounting hole.

[0032] It should be noted that this embodiment does not impose any restrictions on the rotation drive of the gate. Technicians can set it according to actual needs. Although the following embodiment provides a preferred solution for the rotation drive of the gate, it can also be achieved by setting a motor in the rear template to drive the gate to rotate, etc. The inventive concept of this utility model is to use the avoidance area of ​​the gate and its own plate body to switch on one side of the mounting hole, thereby blocking the mounting hole or clearing the mounting hole. Therefore, it should be further explained that this embodiment does not impose any restrictions on the number of mounting holes and avoidance areas. As long as the gate can block the mounting hole and clear the mounting hole by rotating, thereby limiting the push rod when the mold is closed and avoiding the push rod when the mold is opened, it is all within the inventive concept of this utility model.

[0033] Based on the above embodiments, in order to better understand the rotation drive of the gate, in an optional embodiment, the gate mechanism further includes a telescopic drive member 500. One end of the telescopic drive member 500 is hinged to the rear template 300, and the other end is hinged to the edge of the gate 200. When the telescopic drive member is in the extended state or the retracted state, it causes the gate 200 to rotate to the first state or the second state respectively.

[0034] Furthermore, the telescopic drive component is a telescopic hydraulic cylinder or pneumatic cylinder, and the edges of the rear template 300 and the gate 200 are respectively provided with a first hinge point 320 and a second hinge point 220. The body end of the telescopic drive component 500 is hinged to the first hinge point 320 of the rear template 300, and the telescopic output end of the telescopic drive component 500 is hinged to the second hinge point 220 of the gate 200.

[0035] In other words, by changing the extension stroke of the telescopic drive component, the distance between the first hinge point and the second hinge point is changed, thereby causing the gate 200 to rotate around its central axis. Those skilled in the art will understand that the rear template, the gate, and the push rod mounting plate all have a through-hole. This central hole is to reserve space for the demolding cylinder assembly at its central position when the rear template moves after mold opening. This embodiment will not elaborate on this detail. It should be noted that the central holes of the rear template, the gate, and the push rod mounting plate are coaxial. Therefore, the axis of the annular boss described in this invention and the central axis of the gate are coaxial. In this embodiment, the two ends of the telescopic drive component 500 are respectively hinged to the first hinge point 320 of the rear template 300 and the second hinge point 200 of the gate 200. By changing the extension stroke, the gate rotates around its central axis (the first hinge point of the rear template is fixed, and the telescopic drive component swings around the first hinge point), thereby allowing the gate to switch between the first and second states.

[0036] In an optional embodiment, the top surface of the annular boss 310 is provided with a plurality of screw holes, and the push rod mounting plate 100 is locked to the top surface of the annular boss 310 by bolts.

[0037] In this embodiment, to avoid interference between the gate and the push rod mounting plate during mold closing and locking, an appropriate gap is provided between the gate and the push rod mounting plate. Specifically, a certain amount of annular flange protrudes from the middle of the side of the push rod mounting plate (not shown in the figure, but the two sides of the middle position of the push rod mounting plate are consistent, as shown by the annular flange 120 protruding from the middle of the other side of the push rod mounting plate in the figure) so that there is a certain amount of gap between the push rod mounting plate 100 and the gate 200. In practical applications, when the moving template starts locking, the end face of the push rod should be flush with the side of the push rod mounting plate (the side closest to the gate). To prevent the push rod from protruding or exceeding the side of the push rod mounting plate due to the liquid pressure margin in the hydraulic structure, which could easily cause interference when the gate rotates, this embodiment uses an annular flange to increase the gap between the gate and the push rod mounting plate. The specific margin is set according to actual usage requirements, and this embodiment does not impose any restrictions on it. At the same time, this embodiment can also achieve the above purpose by reducing the thickness of the gate, that is, the thickness of the gate is less than the height of the annular boss of the rear template, which can also avoid interference between the gate and the end of the push rod when the mold is locked and rotated.

[0038] For better understanding, in an optional embodiment, the avoidance area of ​​the gate is a clearance space formed by the concave outline edge towards the central axis, with the central axis coaxial with the axis of the annular boss. In this embodiment, considering the overall stability of the gate and manufacturing issues, an arc-shaped concave design is adopted to form a sufficient clearance space for the mounting hole when rotated to the mounting hole position, allowing the mounting hole to communicate with the through hole on the rear template, reserving space for the push rod to move backward. It should be noted that this embodiment does not impose any restrictions on the shape of the concave design; it can be a square concave design forming a clearance groove, or it can be a hole directly opened at the corresponding avoidance position to form a clearance hole for the push rod to retract. Technicians can set the design according to the number of push rods and actual usage requirements.

[0039] In a further improvement to the above embodiment, the shortest distance between the concave contour of the avoidance area and the central axis is L1, and the shortest distance between the edge of the mounting hole of the push rod mounting plate and the central axis is L2, where L1 < L2. Those skilled in the art will understand that the shortest distance L1 between the concave contour and the central axis is smaller than the shortest distance L2 between the edge of the mounting hole and the central axis to ensure that the avoidance area, when rotated to the mounting hole position, can completely avoid the mounting hole so that the mounting hole and the through hole on the rear template can communicate, facilitating the push rod's retraction. This also involves the curvature of the concave contour being greater than the curvature of the mounting hole edge, etc., which will not be described in detail here. The key is to ensure that the avoidance area, when rotated to the designated state, can completely avoid the mounting hole without affecting the push rod's retraction.

[0040] In an optional embodiment, the push rod mounting plate has four mounting holes, and the gate plate has four recessed areas on its four sides to form four avoidance areas. When the gate plate is rotated to a certain state, the mounting holes and the avoidance areas are either offset from each other or coincide with each other.

[0041] The above disclosure is only one or more preferred embodiments of the present utility model, used to help understand the inventive concept of the technical solution, and is not intended to limit the present utility model in any other way. Any other equivalent or conventional substitution schemes made by those skilled in the art based on the features defined by the present utility model shall still fall within the scope of the present utility model.

Claims

1. A rotary gate mechanism for an injection molding machine, characterized in that, It includes a rear template, a gate plate, and a push rod mounting plate. The rear template has a raised center to form a ring boss. The gate plate is sleeved on the ring boss and rotates around the axis of the ring boss. The push rod mounting plate is locked on the ring boss. The push rod mounting plate has at least one mounting hole for assembling the end of the push rod, and the gate plate has an avoidance area corresponding to the mounting hole, so that the gate plate avoids the mounting hole when rotated to the first state and blocks the mounting hole when rotated to the second state.

2. The rotary gate mechanism for an injection molding machine according to claim 1, characterized in that, It also includes a telescopic drive component, one end of which is hinged to the rear template and the other end is hinged to the edge of the gate. When the telescopic drive component is in the extended state or the retracted state, it causes the gate to rotate to the corresponding first state or second state.

3. A rotary gate mechanism for an injection molding machine according to claim 2, characterized in that, The telescopic drive component is a telescopic hydraulic cylinder or pneumatic cylinder. The edges of the rear template and the gate are respectively provided with a first hinge point and a second hinge point. The body end of the telescopic drive component is hinged to the first hinge point of the rear template, and the telescopic output end of the telescopic drive component is hinged to the second hinge point of the gate.

4. A rotary gate mechanism for an injection molding machine according to claim 1, characterized in that, The top surface of the annular boss is provided with several screw holes, and the push rod mounting plate is locked to the top surface of the annular boss by bolts.

5. A rotary gate mechanism for an injection molding machine according to claim 4, characterized in that, The push rod mounting plate has a certain amount of annular flange protruding from the middle of its side to create a certain amount of clearance between the push rod mounting plate and the gate.

6. A rotary gate mechanism for an injection molding machine according to claim 1, characterized in that, The avoidance area of ​​the gate is an empty space formed by the concave outline edge towards the central axis, and the central axis is coaxial with the axis of the ring boss.

7. A rotary gate mechanism for an injection molding machine according to claim 6, characterized in that, The shortest distance between the concave contour of the avoidance area and the central axis is L1, and the shortest distance between the edge of the mounting hole of the push rod mounting plate and the central axis is L2, where L1 < L2.

8. A rotary gate mechanism for an injection molding machine according to claim 1, characterized in that, The push rod mounting plate has four mounting holes, and the gate plate has four recessed areas on its four sides to form four avoidance areas. When the gate plate is rotated to a certain state, the mounting holes and the avoidance areas are either offset from each other or coincide with each other.

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