Hydraulic movable mold plate of injection molding machine

Abstract

The utility model discloses a hydraulic movable mold plate of an injection molding machine, the movable mold plate is provided with at least one mold locking oil cylinder, a piston fixedly connected with the end part of a push rod is arranged in the mold locking oil cylinder, and one side, far away from the push rod, of the piston and the bottom and the side wall of the mold locking oil cylinder form a first hydraulic space; and the first hydraulic space is connected with the hydraulic integrated valve group through an in-plate pipeline. Working oil flows through the in-plate pipeline of the movable mold plate, the design of an oil way in the whole plate is adopted, and mold locking force is provided through the push rod and the mold locking oil cylinder, so that a whole toggle rod mold locking component in a traditional scheme is eliminated between the movable mold plate and the tail plate, and meanwhile, the push rod can be lengthened or shortened according to actual conditions, so that the mold locking force is greatly improved. The stroke between the movable mold plate and the tail plate is changed, and the problems that the stroke of a toggle rod of a traditional injection molding machine is limited and mechanical stress is abraded are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding equipment technical field, especially a hydraulic dynamic mold plate of 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 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, 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, if pull rod is too thick and too rigid, it will cause that the force-increasing curve rises too steep and changes too sensitive at clamping, resulting in difficult mold adjustment, or insufficient locking force, after long-term use, mechanical parts such as column, bearing seat of toggle lever type clamping device may be damaged due to wear, or clamping force is too high to cause damage of pull rod, pull rod nut, mold plate or toggle pin shaft, and since double-toggle form is adopted, locking stroke design is limited (maximum stroke is toggle straightening state), which is difficult to apply 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 form that uses hydraulic pressure in dynamic mold plate to replace the entire toggle lever type locking mechanism, removes the entire toggle lever locking components between rear mold plate and dynamic mold plate, and uses push rod+hydraulic pressure in dynamic mold plate to push dynamic mold plate to complete locking, on this basis, the utility model provides a scheme that when push rod is fixed, the hydraulic force in dynamic mold plate is used to move to fixed mold plate to lock. UTILITY MODEL CONTENTS

[0005] In view of one or more of the above problems, the utility model provides a hydraulic dynamic mold plate of injection molding machine, when the hydraulic action of locking cylinder acts on the fixed push rod, the dynamic mold plate moves to fixed mold plate under the action of hydraulic force in plate to form locking, effectively converts the hydraulic action force in dynamic mold plate into locking force, and solves the problems of limited toggle stroke and mechanical stress wear of traditional toggle type locking.

[0006] To achieve the above purpose, the utility model selects the following technical scheme: a hydraulic dynamic mold plate of injection molding machine, the dynamic mold plate has at least one locking cylinder, the locking cylinder is provided with a piston fixedly connected with the end of push rod, the side, away from the push rod, of the piston and the bottom and side wall of locking cylinder form first hydraulic space, and the first hydraulic space is connected with hydraulic integrated valve group through in-plate pipeline.

[0007] As a further improvement of the utility model: the bottom of the mold locking oil cylinder is provided with a boss, the boss and the inner lateral wall of the cylinder form an annular groove, the inboard pipeline is communicated with the annular groove to make the hydraulic working pressure of the first hydraulic space of each mold locking oil cylinder consistent.

[0008] As a further improvement of the utility model: the inboard pipeline is provided with an oil inlet and outlet pipeline, one end of which is connected with the hydraulic integrated valve group, and the other end is communicated with the annular groove of one of the mold locking oil cylinders, and the adjacent mold locking oil cylinders are communicated through the communication pipeline.

[0009] As a further improvement of the utility model: four mold locking oil cylinders are arranged, and the annular grooves of the four mold locking oil cylinders and the communication pipeline therebetween are controlled by the hydraulic integrated valve group to make the oil inlet or oil outlet of the first hydraulic space of each mold locking oil cylinder through the oil inlet and outlet pipeline.

[0010] As a further improvement of the utility model: a second hydraulic space is arranged between the cylinder cover of the mold locking oil cylinder and the piston, and the cylinder cover is provided with a center hole, and the end of the push rod is fixedly connected with the piston through the center hole.

[0011] As a further improvement of the utility model: oil holes are arranged on the cylinder cover, and oil pipes are arranged between the oil holes to make the hydraulic working pressure of the second hydraulic space of each hydraulic cylinder consistent, and the cylinder cover of one of the mold locking oil cylinders is connected with the hydraulic integrated valve group through the oil hole and the oil pipe.

[0012] As a further improvement of the utility model: the movable die plate is provided with a needle assembly on one side of the mold locking oil cylinder, a plurality of needles are arranged through the movable die plate, and the oil cylinder of the needle assembly is connected with the hydraulic integrated valve group through the oil pipe.

[0013] As a further improvement of the utility model: the hydraulic integrated valve group is arranged on one side of the movable die plate and located at the inlet and outlet of the inboard pipeline.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model works by the inboard pipeline of the movable die plate, adopts the oil path design of the whole inboard, and makes the mold locking oil cylinder and the movable die plate move and bear force synchronously by the inboard hydraulic force and the support of the push rod, converts the inboard hydraulic force to itself, forms the mold locking force by the hydraulic action, provides the mold locking force by the form of the push rod and the mold locking oil cylinder, removes the whole toggle locking component between the movable die plate and the tail plate in the traditional scheme, and changes the stroke between the movable die plate and the tail plate by lengthening or shortening the push rod according to the actual situation, solves the problems of the limited stroke of the toggle of the traditional injection molding machine and the mechanical wear and tear. BRIEF DESCRIPTION OF DRAWINGS

[0016] To more clearly illustrate the technical solution, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the hydraulically driven template in an embodiment.

[0018] Figure 2 This is an exploded view of the structure of the hydraulically driven template in an embodiment.

[0019] Figure 3 This is a cross-sectional structural diagram of the hydraulically driven template at the pipeline inside the plate, as shown in the embodiment.

[0020] Figure 4 This is a cross-sectional structural diagram of the locking cylinder of the hydraulically operated template in an embodiment.

[0021] Figure 5 This is a schematic diagram of the injection molding machine used in an embodiment. Detailed Implementation

[0022] In order to clearly and completely understand the technical solution, the present invention will be further described in conjunction with the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0024] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0025] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0026] An embodiment of this utility model provides a hydraulically driven mold platen for an injection molding machine, such as... Figures 1-4 As shown, the moving template 100 has at least one locking cylinder 200. The locking cylinder 200 is provided with a piston 210 fixedly connected to the end of the push rod 300. The side of the piston 210 away from the push rod 300 forms a first hydraulic space with the bottom and side wall of the locking cylinder 200. The first hydraulic space is connected to the hydraulic integrated valve group 400 through the in-plate pipeline 110.

[0027] To better understand the inventive concept of this utility model, the operation mode of the hydraulically driven mold platen in this embodiment will be explained in conjunction with the operation of an injection molding machine. Specifically, in conjunction with... Figure 5 The injection molding machine includes a fixed platen 10, a movable platen 100, and a tail plate 20. The fixed platen 10 is connected to the movable platen 100 via tie rods 30 at its four corners. The tie rods 30 pass through the movable platen 100 and are fixed to the tail plate 20. The tail plate 20 is equipped with a rotary gate device 40. There is a mold-moving cylinder 21 on each side of the tail plate 20. The piston rod of the mold-moving cylinder 21 is fixedly connected to the movable platen 100. During mold closing, the mold-moving cylinder drives the movable platen to move until the mold locking stage.

[0028] After entering the mold-locking stage, the mold-locking cylinder 200 in this embodiment is controlled by the hydraulic integrated valve group 400 to supply oil. Oil is supplied to the first hydraulic space of the mold-locking cylinder 200 through the in-plate pipeline 110, pushing the piston 210 to move from the bottom to the cylinder cover 220 in the mold-locking cylinder 200. The end of the push rod 300 is fixed on the piston 210 and moves backward toward the tail plate 20 with the piston. At this time, the rotary gate device 40 is controlled by the injection molding machine to rotate to the closed position (the gate rotates to block the other end of the push rod, so that the other end of the push rod is pressed against the gate and cannot move backward, thereby locking or fixing the push rod). The push rod 300 is fixed or pressed and cannot move backward, forming a support. At the same time, since the first hydraulic space continues to supply oil, and the push rod 300 and piston 210 are fixed, the mold-locking cylinder 200 and the moving platen 100 move toward the fixed platen 10 and / or generate force, forming a mold-locking force through hydraulic action.

[0029] It should be noted that this embodiment does not impose any restrictions on the structure and operation of the fixed template, tail plate, mold moving cylinder, and rotary gate device involved in the above-mentioned mold closing drive. Technicians can set them themselves according to actual usage requirements, as long as the mold closing drive can be realized and the push rod can be fixed or locked when the mold is locked. Similarly, when the mold is opened, the rotary gate device is controlled to rotate to the open position, the mold moving cylinder drives the moving template to retract, and the push rod passes through the rotary gate device and the tail plate to retract.

[0030] Those skilled in the art will understand that the sealing connection between the push rod and the mold-locking cylinder, and between the cylinder body and cylinder head of the mold-locking cylinder in this embodiment, has an oil seal design. This embodiment does not impose any limitations on the oil seal structure and materials; existing technology can be used to achieve this. Furthermore, this utility model does not limit the structure of the hydraulic integrated valve group or the hydraulic control system. The hydraulic integrated valve group is generally a highly integrated component composed of a valve block, hydraulic valve, auxiliary components, etc. The hydraulic control system is responsible for providing hydraulic power. Technicians can set it themselves according to actual usage requirements. Existing hydraulic control technology can be used to control the flow rate, pressure, and direction of the working oil in each pipeline through the hydraulic integrated valve group.

[0031] In this embodiment, the working oil flows through the internal piping of the moving platen, while the clamping force is provided by a push rod and a clamping cylinder. This eliminates the need for the entire elbow clamping component found in traditional solutions, and because the push rod is a straight rod, the clamping force is more rigid and reliable. This is comparable to the clamping force provided by non-elbow clamping systems that use a double-crankshaft oscillating deformation. Furthermore, since the push rod can be lengthened or shortened according to actual needs, the stroke between the moving platen and the tail platen can be changed, solving the problems of limited elbow stroke and mechanical wear in traditional injection molding machines.

[0032] To better understand the structure of the hydraulically driven template, in an optional embodiment, such as Figure 3 and 4 As shown, the bottom of the mold-locking cylinder 200 has a protrusion 230, and the protrusion 230 forms an annular groove 240 with the inner sidewall of the cylinder. The inner pipe 110 of the plate is connected to the annular groove 240 so that the hydraulic working pressure of the first hydraulic space of each mold-locking cylinder is consistent.

[0033] Furthermore, the plate-in-plate pipeline 110 has an inlet and outlet oil pipeline 111, one end of which is connected to the hydraulic integrated valve group 400, and the other end is connected to the annular groove 240 of one of the mold-locking cylinders 200. Adjacent mold-locking cylinders 200 are connected by a connecting pipeline 112. The hydraulic integrated valve group 400 is located on one side of the moving template 100 and at the inlet and outlet of the plate-in-plate pipeline 110.

[0034] In this embodiment, when the piston 210 is in a normal non-working state, the bottom surface of the piston 210 is in contact with the top surface of the boss 230. When the work starts, oil is introduced from the inlet and outlet oil pipes 111 under the control of the hydraulic integrated valve group 400 and enters the annular groove 240 of one of the mold-locking cylinders 200. At this time, since the annular grooves 240 of each mold-locking cylinder 200 are connected by the connecting pipes 112, the hydraulic working force of each mold-locking cylinder 200 is the same, which causes the pistons 210 in each mold-locking cylinder 200 to start lifting synchronously, thereby pushing the push rod 300. At this time, the push rod 300 is fixed by the rotary gate device 40, that is, the piston 210 is also fixed. Since the piston cannot move and the hydraulic force increases as the oil intake in the first hydraulic space increases, the mold-locking cylinder 200 and the moving mold plate 100 as a whole begin to move towards the fixed mold plate 10 with the push rod 300 as support and / or generate force, forming a mold-locking force through the hydraulic action within the plate.

[0035] In some embodiments, four clamping cylinders 200 are provided. The annular grooves 240 of the four clamping cylinders and the connecting pipes 112 between them are controlled by the hydraulic integrated valve group to allow oil to flow into or out of the first hydraulic space of each clamping cylinder 200 through the inlet and outlet oil pipes 111. It should be noted that although this embodiment uses four clamping cylinders as the preferred option, the number of clamping cylinders can be set according to the size of the injection molding machine, performance requirements, and actual usage needs.

[0036] On the other hand, the present invention also provides a preferred solution for hydraulic reset of the mold-locking cylinder. To better understand, the present invention also provides an optional embodiment. Based on one or more of the above embodiments, a second hydraulic space is provided between the cylinder cover 220 of the mold-locking cylinder 200 and the piston 210, and the cylinder cover 220 is provided with a central hole. The end of the push rod 300 passes through the central hole and is fixedly connected to the piston 210.

[0037] Furthermore, the cylinder head 220 is provided with an oil port 221, and an oil pipe is provided between each oil port 221 to make the hydraulic working pressure of the second hydraulic space of each hydraulic cylinder consistent. The cylinder head 220 of one of the mold-locking cylinders 200 is connected to the hydraulic integrated valve group 400 through the oil port 221 and the oil pipe.

[0038] In this embodiment, after the injection molding machine locks the mold and completes the injection molding process, when performing mold locking pressure relief and reset, the hydraulic pressure in the first hydraulic space is first relieved by controlling the hydraulic integrated valve group 400, and then oil is introduced from the oil pipe into the second hydraulic space of the mold locking cylinder to make the piston move toward the boss and then reset. After the mold locking reset, the rotary gate device is controlled to rotate to the open position, so that the mold opening, ejection, and ejection processes can be performed.

[0039] In an optional embodiment, the moving template 100 is provided with an ejector pin assembly 500 on one side of the locking cylinder 200. The ejector pin assembly 500 is provided with a plurality of ejector pins 510 that penetrate the moving template 100, and the cylinder of the ejector pin assembly 500 is connected to the hydraulic integrated valve group 400 through an oil pipe.

[0040] 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 hydraulically driven mold platen for an injection molding machine, characterized in that, The moving template has at least one locking cylinder. The locking cylinder has a piston that is fixedly connected to the end of the push rod. The side of the piston away from the push rod forms a first hydraulic space with the bottom and side wall of the locking cylinder. The first hydraulic space is connected to a hydraulic integrated valve group through an internal pipeline.

2. The hydraulically driven mold platen of an injection molding machine according to claim 1, characterized in that, The bottom of the mold-locking cylinder has a raised boss, which forms an annular groove with the inner sidewall of the cylinder. The pipes inside the plate are connected to the annular groove to make the hydraulic working pressure of the first hydraulic space of each mold-locking cylinder consistent.

3. The hydraulically driven mold platen of an injection molding machine according to claim 1, characterized in that, The internal piping has one inlet and one outlet oil pipe, one end of which is connected to the hydraulic integrated valve group, and the other end is connected to the annular groove of one of the mold-locking cylinders. Adjacent mold-locking cylinders are connected by connecting pipes.

4. The hydraulically driven mold platen of an injection molding machine according to claim 3, characterized in that, The mold-locking cylinder is provided with four cylinders. The annular grooves of the four mold-locking cylinders and the connecting pipes between them are controlled by the hydraulic integrated valve group to allow oil to enter or exit the first hydraulic space of each mold-locking cylinder through the inlet and outlet pipes.

5. The hydraulically driven mold platen of an injection molding machine according to claim 1, characterized in that, A second hydraulic space is provided between the cylinder head of the mold-locking cylinder and the piston, and the cylinder head is provided with a central hole, through which the end of the push rod passes and is fixedly connected to the piston.

6. The hydraulically driven mold platen of an injection molding machine according to claim 5, characterized in that, The cylinder head is provided with oil port holes, and oil pipes are installed between each oil port hole to make the hydraulic working pressure of the second hydraulic space of each hydraulic cylinder consistent. The cylinder head of one of the mold-locking cylinders is connected to the hydraulic integrated valve group through the oil port holes and oil pipes.

7. The hydraulically driven mold platen of an injection molding machine according to claim 1, characterized in that, The moving template is located on one side of the locking cylinder and is also provided with an ejector pin assembly. The ejector pin assembly is provided with a plurality of ejector pins that penetrate the moving template, and the cylinder of the ejector pin assembly is connected to the hydraulic integrated valve group through an oil pipe.

8. The hydraulically driven mold platen of an injection molding machine according to claim 1, characterized in that, The hydraulic integrated valve assembly is located on one side of the moving template and at the inlet and outlet of the pipe inside the template.

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