Injection molding equipment

Abstract

The injection molding equipment comprises a movable mold plate and a rotary gate plate, the movable mold plate comprises a mold locking oil cylinder and a push rod under the hydraulic action of the mold locking oil cylinder, the rotary gate plate is provided with a limiting hole, the limiting hole is controlled by the rotary gate plate to be opened and closed, and the limiting hole is connected with the end of the push rod. During mold locking, the push rod is pushed to the limiting hole in the closed state through the hydraulic acting force of the mold locking oil cylinder so that the push rod can be fixed, and the push rod serves as a support so that the movable mold plate can form mold locking force towards the fixed mold plate under the hydraulic acting force. According to the invention, the hydraulic acting force of the movable mold plate is directly applied to the mold to form the mold clamping force by utilizing the in-plate hydraulic action of the movable mold plate and taking the rotary gate plate as a support, the original hydraulic toggle connecting rod type is changed, the whole toggle rod type mold clamping mechanism is eliminated, and the hydraulic mold clamping force is directly converted into the mold clamping force, so that the mold clamping force is more stable and reliable; the problems that the stroke of a toggle rod of a transmission injection molding machine is limited and mechanical stress is abraded are solved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding machines, in particular to an injection molding device. Background Art

[0002] At present, most of the clamping parts of injection molding machines adopt the toggle mechanism. The toggle clamping mechanism is the most commonly used clamping mechanism on small and medium-sized injection molding machines. Its structural feature (double toggle) is composed of a clamping cylinder and two symmetrical toggle side rod mechanisms. When clamping, the high-pressure oil in the mold transfer cylinder pushes the crosshead to straighten the toggle connecting rod, and the system produces elastic deformation to achieve the clamping force.

[0003] However, the stress state of the elbow-type clamping mechanism is not ideal. Since the clamping force is mainly obtained by deformation of the pull rod, if the pull rod is too thick and rigid, the force increase curve will rise too steeply and change too sensitively at the clamping point, making mold adjustment difficult or the clamping force insufficient. After long-term use, the mechanical parts of the elbow-type clamping device, such as the coring column and the bearing seat, may cause the clamping force to decrease due to wear, or the clamping force may be too high, causing damage to the pull rod, the pull rod nut, the template or the elbow pin; and due to the use of a hyperbolic elbow, the clamping stroke design is limited (the maximum stroke is when the elbow is straight), which is difficult to apply to large-scale injection molding equipment or injection molding equipment that requires a longer stroke.

[0004] Based on the above situation, the inventor has developed an injection molding machine with a new clamping type, which uses the hydraulic pressure in the moving template to provide the clamping force to replace the entire toggle-type clamping mechanism. The entire toggle-type clamping component between the rear template and the moving template is removed, and the push rod + hydraulic method is used to push the moving template to complete the clamping. Summary of the invention

[0005] In view of one or more of the above problems, the present invention provides an injection molding equipment, which utilizes the hydraulic action inside the movable template to support the rotating gate plate so that the hydraulic force of the movable template is directly applied to the mold to form a locking force, changes the original hydraulic elbow connecting rod type, eliminates the entire elbow type locking mechanism, and adopts a locking cylinder for high-pressure locking. The hydraulic locking force is directly converted into the locking force. There is no need to transmit the hydraulic force generated by the tail plate to the movable template through the crankshaft structure to output the locking force. The locking force is more stable and reliable, and the reduction of redundant structure also reflects the coordination between the templates and their components. The whole equipment is more concise, and the problems of limited elbow stroke and mechanical wear of the transmission injection molding machine are solved.

[0006] To achieve the above-mentioned purpose, the present invention selects the following technical scheme: an injection molding equipment, including a movable template and a rotating gate, the movable template includes a locking cylinder and a push rod under the hydraulic action of the locking cylinder, the rotating gate has a limit hole and the limit hole is controlled to open and close by the rotating gate, the limit hole is connected to the end of the push rod, when locking the mold, the push rod is pushed toward the limit hole in the closed state by the hydraulic force of the locking cylinder to fix the push rod, and the push rod is used as a support so that the movable template is subjected to the hydraulic force to form a locking force toward the fixed template.

[0007] As a further improvement of the present invention: it also includes a tail plate, the rotating gate plate is arranged on the side of the tail plate facing the dynamic template, the tail plate is provided with a rod withdrawal hole at the position corresponding to the limiting hole, the rotating gate plate has a rotating plate body and is rotatably arranged between the limiting hole and the rod withdrawal hole, and the rotation opening and rotation closing of the rotating plate body correspondingly controls the communication and blocking between the limiting hole and the rod withdrawal hole.

[0008] As a further improvement of the present invention: a center hole is provided in the middle of the rotating gate and the tail plate and is coaxially arranged, the rotating gate has a fixed plate body, the limit hole is arranged on the fixed plate body, the rotating plate body rotates around the axis and an avoidance position is provided on the rotating plate body, so that when the rotating plate body is rotated to a closed state, the limit hole is blocked by the plate body, and when it is rotated to an open state, the limit hole of the fixed plate body and the withdrawal rod hole of the tail plate are connected through the avoidance position.

[0009] As a further improvement of the present invention: the rotating gate plate also has a telescopic cylinder, the cylinder end of the telescopic cylinder is hinged on the tail plate, and the end of the telescopic rod is hinged on the rotating plate body, so that the extension or contraction of the telescopic cylinder drives the rotating plate body to rotate around the axis.

[0010] As a further improvement of the present invention: the end of the push rod is fixedly connected to the piston in the locking cylinder, and a first oil chamber for locking the mold and a second oil chamber for hydraulic resetting are respectively formed on both sides of the piston in the locking cylinder, the first oil chamber is connected to the hydraulic integrated valve group through the internal pipeline of the movable template, and the second oil chamber is connected to the hydraulic integrated valve group through an oil pipe.

[0011] As a further improvement of the present invention: the first oil chamber is located at the bottom of the locking cylinder, a boss is raised in the middle of the cylinder bottom, the boss and the cylinder wall form an annular groove, one end of the internal plate pipeline is connected to the hydraulic integrated valve group arranged on the outside of the movable template, and the other end is connected to the annular groove.

[0012] As a further improvement of the present invention: the intra-plate pipeline includes a main pipeline and a secondary pipeline, the hydraulic integrated valve group is connected with the annular groove of one of the clamping cylinders or one of the secondary pipelines through the main pipeline, and the annular grooves of adjacent clamping cylinders are connected through the secondary pipeline, so that the hydraulic force of the first oil chamber of each clamping cylinder is synchronized.

[0013] As a further improvement of the present invention: the movable platen further comprises a demoulding oil cylinder, the demoulding oil cylinder is located in the middle of the movable platen and is connected to the hydraulic integrated valve group through an oil pipe.

[0014] As a further improvement of the present invention: the fixed mold plate is connected to the tail plate through a pull rod passing through the movable mold plate, and the tail plate drives the movable mold plate on the pull rod through a mold adjusting device, and mold shifting cylinders are provided on both sides of the tail plate, and the piston rods of the mold shifting cylinders are fixed to both sides of the movable mold plate. The mold thickness is adjusted by the mold adjusting device, the movable mold plate is quickly shifted by the mold shifting cylinder, and high-pressure mold locking is performed by the clamping cylinder.

[0015] As a further improvement of the present invention: the mold adjusting device includes a mold adjusting gear arranged in the middle of the side surface of the tail plate, a mold adjusting motor driving the mold adjusting gear, and a mold adjusting stud connected to the mold adjusting gear in transmission, the mold adjusting stud is connected to the pull rod so that the mold adjusting motor drives the mold adjusting gear and the mold adjusting stud to rotate and cause axial displacement, thereby pushing the tail plate and / or the movable mold plate to cause axial displacement, so as to adjust the mold thickness and the clamping force.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention provides clamping force through the hydraulic pressure in the movable template, provides better expandability for the whole equipment, changes the original hydraulic toggle connecting rod type, eliminates the entire toggle type clamping mechanism, and adopts a clamping cylinder for high-pressure clamping. The hydraulic clamping force is directly converted into the clamping force. There is no need to transmit the hydraulic force generated by the tail plate to the movable template through the crankshaft structure to output the clamping force. The clamping force is more stable and reliable, and the reduction of redundant structure also reflects the coordination between the templates and their components. The whole equipment is more simple and solves the problems of limited toggle travel and mechanical wear of the transmission injection molding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution, the drawings required for use in the implementation will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a schematic diagram of the structure of the injection molding equipment according to an embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the structure of the injection molding equipment according to an embodiment of the present invention.

[0021] Figure 3 It is a structural explosion view of the tailgate and the rotating gate according to an embodiment of the present invention.

[0022] Figure 4 It is a structural schematic diagram of the open state of the rotary gate according to an embodiment of the present invention.

[0023] Figure 5 This is a structural explosion view of the movable template according to an embodiment of the present invention.

[0024] Figure 6 It is a schematic diagram of the cross-sectional structure of the pipeline inside the movable template of an embodiment of the present invention.

[0025] Figure 7 It is a schematic diagram of the cross-sectional structure of the clamping cylinder of the movable template according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to enable a clear and complete understanding of the technical solution, the present invention is further described in conjunction with the embodiments and drawings. Obviously, the described embodiments are only some embodiments of the present invention, and all other embodiments obtained by technicians in the relevant field without making creative work are within the scope of protection of the present invention.

[0027] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0028] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0029] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0030] An embodiment of the present invention provides an injection molding device, such as Figure 1-5As shown, it includes a movable template 200 and a rotating gate 400, the movable template 200 includes a clamping cylinder 210 and a push rod 211 under the hydraulic action of the clamping cylinder 210, the rotating gate 400 has a limiting hole 421 and the limiting hole 421 is controlled to open and close by the rotating gate 400, the limiting hole 421 is connected to the end of the push rod 211, when clamping, the push rod 211 is pushed toward the limiting hole 421 in the closed state by the hydraulic force of the clamping cylinder 210 to fix the push rod 211, and the movable template 200 is supported by the hydraulic force to form a clamping force toward the fixed template 100.

[0031] Those skilled in the art will understand that when the injection molding equipment is closing the mold, the mold shifting cylinder on the tail plate pushes the movable mold plate toward the fixed mold plate to perform rapid and / or low-pressure closing. This embodiment does not impose any form of limitation on this. Although a preferred solution is provided in the following embodiments, the inventive concept of this embodiment is intended to protect the high-pressure clamping force provided by the hydraulic pressure inside the movable mold plate.

[0032] In this embodiment, when entering the high-pressure clamping stage, the limiting hole 421 is controlled to be in a closed state by rotating the gate 400. At this time, one side of the limiting hole 421 is blocked, which can be blocked by the rotating plate body or in other forms. The purpose is to limit or fix the push rod 211 so that it cannot pass through the rotating gate, so that the push rod 211 is used as a support when subjected to force, so that the force is applied in the opposite direction to the movable template 200.

[0033] Furthermore, when the limiting hole 211 is in a closed state, the hydraulic pressure of the locking cylinder 210 starts to work to generate a hydraulic force and act on the push rod 211. The end of the push rod 211 is fixedly connected to the piston of the locking cylinder 210. The hydraulic action causes the piston to move, thereby pushing the push rod 211 toward the rotating gate 400. At this time, since the limiting hole 421 is blocked, the push rod 211 is fixed and supported. As the hydraulic force is continuously applied, with the push rod 211 as the support, the locking cylinder 210 moves in the opposite direction and / or applies a force under the hydraulic force, so that the movable template 200 applies a hydraulic force toward the fixed template 100, which is converted into a locking force applied to the mold.

[0034] In this embodiment, since a straight integral rod body such as a push rod is used as a support, the clamping force generated by it is very stable and reliable, while the traditional elbow-type clamping solution adopts a double-bend elbow side rod mechanism, which is transmitted through the swing angle of the joint hinge, and the power end is located at the tail plate. The double-bend elbow side rod mechanism is used to transmit and push the movable template to form the clamping force, which is easy to be mechanically worn, and the elbow stroke is limited. This embodiment adopts the form of hydraulic pressure inside the push rod and the movable template. The power end is on the movable template and supported by the push rod. The length of the push rod can be set according to actual needs. As long as the end of the push rod is blocked and fixed by the rotating gate, the hydraulic force of the movable template can be applied to the mold to form the clamping force, which can effectively solve the problem of the limited elbow stroke and mechanical wear of the traditional injection molding machine.

[0035] It should be noted that the present embodiment adopts four clamping cylinders as shown in the figure, but in actual production applications, the number of clamping cylinders can be set to two, three, six, etc. according to actual usage requirements. As long as they are distributed in a circular array and the limiting holes are opened or closed by rotating the rotary gate, the technical effect of the present invention can be achieved. In this regard, the present embodiment does not limit the setting of the number of clamping cylinders, push rods, etc.

[0036] In order to better understand the sealing structure of the push rod achieved by the rotating gate, based on the above embodiment, in an optional embodiment, the injection molding equipment also includes a tail plate 300, and the rotating gate 400 is arranged on the side of the tail plate 300 facing the dynamic template 200, and the tail plate 300 is provided with a rod withdrawal hole 310 at the position corresponding to the limiting hole 421, and the rotating gate 400 has a rotating plate body 410 and is rotatably arranged between the limiting hole 421 and the rod withdrawal hole 310, and the rotation opening and rotation closing of the rotating plate body 410 correspondingly controls the communication and blocking between the limiting hole 421 and the rod withdrawal hole 310.

[0037] Furthermore, the rotating gate 400 and the tail plate 300 are provided with a center hole in the middle and are coaxially arranged. The rotating gate 400 has a fixed plate body 420, and the limiting hole 211 is arranged on the fixed plate body 420. The rotating plate body 410 rotates around the axis and an avoidance position 411 is provided on the rotating plate body 410, so that when the rotating plate body 410 is rotated to a closed state, the limiting hole 421 is blocked by the plate body, and when it is rotated to an open state, the limiting hole 421 of the fixed plate body 420 and the withdrawal hole 310 of the tail plate 300 are connected through the avoidance position 411.

[0038] In this embodiment, the edge of the center hole of the tailgate 300 is raised with an annular platform 320 for assembling the rotating plate body 410 and the rotating plate body 410 rotates around the axis of the center hole. The limiting hole 421 is arranged on the fixed plate body 420 corresponding to the position of the push rod 211. When in the rotationally closed state, the end of the push rod is located in the limiting hole and is pressed against the rotating plate body under the action of hydraulic pressure. Because one side of the rotating plate body is in contact with the tailgate, the ends of multiple push rods are pressed against the entire solid plate body and the plate body is supported by the tailgate, making the push rod pressing stronger, more stable and more evenly stressed. When in the rotationally open state, the avoidance position of the rotating plate body overlaps with the limiting hole. Figure 5 In the state shown, the limiting hole 421 is connected to the rod withdrawal hole 310. After the dynamic platen undergoes the processes of injection molding, melting molding, and injection withdrawal in the mold clamping, the mold clamping pressure is released to reset the hydraulic pressure. The mold shifting oil cylinder of the tail plate pulls back the dynamic platen so that the push rod starts to retreat and moves backward through the limiting hole through the avoidance position of the rotating plate body and the rod withdrawal hole of the tail plate. This embodiment controls the opening and closing of the limiting hole by the rotation of the rotating plate body, so that the hydraulic force of the mold clamping oil cylinder of the dynamic platen pushes the platen back to form a mold clamping force during mold clamping and does not affect the backward movement of the push rod during mold opening.

[0039] The rotation drive of the rotating plate body in this embodiment can be achieved by setting up a motor drive, or by some existing swinging mechanisms to realize the rotation of the rotating plate body around the axis. The following preferred embodiment provides a method of using a telescopic cylinder or oil cylinder between two hinge points to drive the above rotating plate body to rotate.

[0040] Specifically, in an optional embodiment, the rotating gate further has a telescopic cylinder 430, the cylinder end of the telescopic cylinder 430 is hinged on the tail plate 300, and the end of the telescopic rod is hinged on the rotating plate body 410, so that the extension or contraction of the telescopic cylinder drives the rotating plate body 410 to rotate around the axis. The telescopic cylinder includes a cylinder body and a telescopic rod. The tail plate of the cylinder body is hinged on a hinge point of the tail plate and can swing around the hinge point. The end of the telescopic rod is hinged on a hinge point of the rotating plate body and can also swing around the hinge point. The extension or contraction of the telescopic rod in the cylinder body changes the distance between the two hinge points. Since the hinge point on the tail plate is fixed, the hinge point of the rotating plate body changes position with the extension and contraction of the telescopic rod, so that the rotating plate body rotates around the axis. In this embodiment, when the telescopic rod is in the extended state, the rotating plate body rotates to the closed state, that is, the rotating plate body blocks the limiting hole on the fixed plate body. Similarly, when the telescopic rod is in the retracted state, the rotating plate body rotates to the open state, such as Figure 5 As shown, the avoidance position of the rotating plate body overlaps with the limiting hole, so that the limiting hole and the rod withdrawal hole are connected for the retreat of the push rod.

[0041] In some embodiments, the fixed plate body 420 has the same contour as the rotating plate body (ignoring the hinge point position of the rotating plate body connected to the telescopic rod), and two sensors 422 are provided at the limiting hole on the side of the fixed plate body 420 and at the air-avoiding concave position, which are used to sense whether the rotating gate is in an open state or a closed state and obtain signal feedback of the specific state.

[0042] In order to better understand the clamping cylinder structure of the movable platen, another embodiment of the present invention further provides an injection molding device, such as Figure 5-7 As shown, on the basis of one or more of the above-mentioned embodiments, the end of the push rod 211 is fixedly connected to the piston 212 in the locking cylinder 210, and a first oil chamber 213 for locking and a second oil chamber 214 for hydraulic resetting are respectively formed on both sides of the piston 212 in the locking cylinder, the first oil chamber 213 is connected to the hydraulic integrated valve group 230 through the internal pipeline 220 of the movable template 200, and the second oil chamber 214 is connected to the hydraulic integrated valve group 230 through an oil pipe.

[0043] It can be understood by those skilled in the art that the sealing connection between the push rod and the clamping cylinder, and between the cylinder body and the cylinder cover of the clamping cylinder, etc. in this embodiment has an oil seal design. This embodiment does not impose any restrictions on the oil seal structure and materials, etc., and can be implemented using existing technologies. Furthermore, the present invention does not impose any restrictions on the structure of the hydraulic integrated valve group and the hydraulic control system. The hydraulic integrated valve group is generally a highly integrated component composed of a valve block, a hydraulic valve, auxiliary components, etc. The hydraulic control system is responsible for providing hydraulic power, and the technicians can set it according to actual use requirements. The existing hydraulic control technology can be used to control the flow, pressure and direction of the working oil of each pipeline through the hydraulic integrated valve group.

[0044] Furthermore, the first oil chamber 213 is located at the bottom of the locking cylinder 210, and a boss 2131 is raised in the middle of the cylinder bottom. The boss 2131 and the cylinder wall form an annular groove 2132. One end of the internal plate pipeline 220 is connected to the hydraulic integrated valve group 230 arranged on the outside of the dynamic template 200, and the other end is connected to the annular groove 2132.

[0045] In this embodiment, the piston 212 is in a normal non-working state, and the bottom surface of the piston is in contact with the top surface of the boss 2131. When the hydraulic operation starts, under the control of the hydraulic integrated valve group 230, the piston enters the annular groove 2132 through the plate inner pipeline 220. As the oil continues to flow in, the piston begins to rise, so that the push rod moves toward the rotating gate. When the rotating gate is closed, the end of the push rod presses on the rotating plate body, and with this as a support, the hydraulic force is continuously increased, so that the clamping cylinder and the movable plate are supported by the push rod and move toward the fixed plate direction, applying a clamping force to the mold. After the clamping process is completed, the clamping pressure is released, and under the control of the hydraulic integrated valve group 230, the hydraulic operation of the first oil chamber is stopped, and oil is fed into the second oil chamber through the oil pipe. The piston is reset under the hydraulic action of the second oil chamber and moves toward the boss, and then the rotating plate body is controlled to rotate to the open state, and then the mold opening action is performed, and the push rod can retreat through the avoidance position of the rotating plate body and the rod withdrawal hole of the tail plate.

[0046] In order to further solve the problem of synchronization of hydraulic action between multiple clamping cylinders, in an optional embodiment, the intra-plate pipeline 220 includes a main pipeline 221 and a sub-pipeline 222, and the hydraulic integrated valve group 230 is connected to the annular groove of one of the clamping cylinders or one of the sub-pipelines through the main pipeline 221, and the annular grooves of adjacent clamping cylinders are connected through the sub-pipeline to make the hydraulic force of the first oil chamber of each clamping cylinder synchronized.

[0047] In this embodiment, under the control of the hydraulic integrated valve group 230, oil is introduced from the main pipeline 221 into the annular groove 2132 of one of the locking cylinders 210. At this time, since the annular grooves 2132 of each locking cylinder 210 are connected through the auxiliary pipeline 222, the hydraulic working force of the first oil chamber of each locking cylinder 210 is the same, so that the pistons 212 in each locking cylinder 210 start to lift synchronously, thereby pushing the push rod 300.

[0048] In some embodiments, the cylinder head 215 of the locking cylinder 210 is provided with an oil port 216, wherein one of the locking cylinders is connected to the hydraulic integrated valve group 230 through the oil port, so that oil can be supplied to the second oil chamber of the locking cylinder under the control of the hydraulic integrated valve group 230, and the cylinder heads of adjacent locking cylinders are connected through corresponding oil ports and oil pipes, so that the hydraulic forces of the second oil chambers of each locking cylinder are synchronized.

[0049] Obviously, the above embodiments are only used to illustrate the structure of the movable mold plate and the rotating gate of the present invention, and are not intended to limit the scope of protection of the present invention. Without departing from the concept of the present invention, those skilled in the art can adjust the above structure so that the present invention can be applied to more specific application scenarios.

[0050] In an optional embodiment, the movable platen further comprises a demoulding cylinder 500, which is located in the middle of the movable platen 200 and is connected to the hydraulic integrated valve group 230 through an oil pipe. A center hole is provided in the middle of the tail plate and the rotary gate plate. During the mold opening process, the center hole can reserve a position for the demoulding cylinder to retreat, making the entire injection molding equipment more concise, especially the part between the movable platen and the tail plate, reducing the entire toggle-type clamping mechanism in the traditional solution and eliminating redundant structural components.

[0051] In an optional embodiment, if Figure 2 As shown, the fixed mold plate 100 is connected to the tail plate 300 through the movable mold plate 200 via the pull rod 110. The tail plate 300 drives the movable mold plate 200 on the pull rod 110 via the mold adjusting device. Mold shifting cylinders 330 are provided on both sides of the tail plate 300. The piston rod 321 of the mold shifting cylinder 330 is fixed to both sides of the movable mold plate 200. The mold thickness is adjusted by the mold adjusting device, the movable mold plate is quickly shifted by the mold shifting cylinder, and high-pressure mold locking is performed by the clamping cylinder.

[0052] Optionally, the mold adjusting device includes a mold adjusting gear 340 arranged in the middle of the side of the tail plate 300, a mold adjusting motor 350 driving the mold adjusting gear 340, and a mold adjusting stud 360 transmission connected to the mold adjusting gear 340, and the mold adjusting stud is connected to the pull rod so that the mold adjusting motor drives the mold adjusting gear and the mold adjusting stud to rotate and cause axial displacement, thereby pushing the tail plate and / or the movable mold plate to cause axial displacement, which is used to adjust the mold thickness (the maximum and minimum thickness of the mold that the injection molding machine can accommodate) and the clamping force.

[0053] It is understandable to those skilled in the art that the mold adjustment stud and the tie rod (coring column) cooperate to achieve the axial displacement of the tail plate and the movable platen. In this regard, this embodiment does not explain too much about the mold adjustment stud on the coring column causing the tail plate to undergo axial displacement, which can be achieved by using the existing technology. Similarly, the present invention does not describe other components of the injection molding equipment, such as the structure of the demoulding cylinder and the means for achieving its function, which are all achieved by using the existing technology. In this embodiment, the mold adjustment device can cause the tail plate to undergo axial displacement on the tie rod, which is used to adjust the mold capacity thickness required by the mold.

[0054] Through the description of one or more of the above embodiments, those skilled in the art can clearly understand that the injection molding equipment of the present invention provides clamping force through the hydraulic pressure in the movable template, which provides better expandability for the whole equipment. It can increase the push rod length design in the small-tonnage injection molding machine to increase the mold opening and closing stroke, change the original hydraulic elbow connecting rod type, eliminate the entire elbow-type clamping mechanism, and use a clamping cylinder for high-pressure clamping. The hydraulic clamping force is directly converted into the clamping force. There is no need to transmit the hydraulic force generated by the tail plate to the movable template through the crankshaft structure to output the clamping force. The clamping force is more stable and reliable. A center hole is provided in the middle of the tail plate and the rotating gate plate to accommodate the retreat of the demolding cylinder on the movable template. Reducing redundant structures also reflects the coordination between the templates and their components. The whole equipment is more concise, which solves the problems of limited elbow stroke and mechanical wear of the transmission injection molding machine.

[0055] The above disclosure is only one or more preferred embodiments of the present invention, which are used to help understand the inventive concept of the technical solution, and is not intended to limit the present invention in other forms. Technical personnel in the relevant field may make other equivalent or customary replacement schemes based on the features defined by the present invention, which still fall within the scope of the present invention.

Claims

1. An injection molding device, characterized in that: It includes a movable template and a rotating gate, the movable template includes a locking cylinder and a push rod under the hydraulic action of the locking cylinder, the rotating gate has a limit hole and the limit hole is controlled to open and close by the rotating gate, the limit hole is connected to the end of the push rod, when locking the mold, the push rod is pushed toward the limit hole in the closed state by the hydraulic force of the locking cylinder to fix the push rod, and the push rod is used as a support so that the movable template is subjected to the hydraulic force to form a locking force toward the fixed template.

2. An injection molding device according to claim 1, characterized in that: It also includes a tail plate, the rotating gate plate is arranged on the side of the tail plate facing the dynamic template, the tail plate is provided with a rod withdrawal hole at the position corresponding to the limiting hole, the rotating gate plate has a rotating plate body and is rotatably arranged between the limiting hole and the rod withdrawal hole, and the rotation opening and rotation closing of the rotating plate body correspondingly control the communication and blocking between the limiting hole and the rod withdrawal hole.

3. An injection molding device according to claim 2, characterized in that: The rotating gate and the tail plate are provided with a center hole in the middle and are coaxially arranged. The rotating gate has a fixed plate body, and the limiting hole is arranged on the fixed plate body. The rotating plate body rotates around the axis and an avoidance position is provided on the rotating plate body, so that when the rotating plate body is rotated to a closed state, the limiting hole is blocked by the plate body, and when the rotating plate body is rotated to an open state, the limiting hole of the fixed plate body and the withdrawal rod hole of the tail plate are connected through the avoidance position.

4. An injection molding device according to claim 3, characterized in that: The rotary gate plate also has a telescopic cylinder, the cylinder end of the telescopic cylinder is hinged on the tail plate, and the end of the telescopic rod is hinged on the rotating plate body, so that the extension or contraction of the telescopic cylinder drives the rotating plate body to rotate around the axis.

5. The injection molding device according to claim 1, characterized in that: The end of the push rod is fixedly connected to the piston in the locking cylinder. A first oil chamber for locking the mold and a second oil chamber for hydraulic resetting are formed on both sides of the piston in the locking cylinder. The first oil chamber is connected to the hydraulic integrated valve group through the internal pipeline of the movable template, and the second oil chamber is connected to the hydraulic integrated valve group through an oil pipe.

6. An injection molding device according to claim 5, characterized in that: The first oil chamber is located at the bottom of the locking cylinder, and a boss is raised in the middle of the cylinder bottom. The boss and the cylinder wall form an annular groove. One end of the internal plate pipeline is connected to the hydraulic integrated valve group arranged on the outside of the dynamic template, and the other end is connected to the annular groove.

7. An injection molding device according to claim 6, characterized in that: The pipeline inside the plate includes a main pipeline and a secondary pipeline. The hydraulic integrated valve group is connected to the annular groove of one of the clamping cylinders or one of the secondary pipelines through the main pipeline. The annular grooves of adjacent clamping cylinders are connected through the secondary pipeline to make the hydraulic force of the first oil chamber of each clamping cylinder synchronized.

8. The injection molding device according to claim 5, characterized in that: The movable platen also includes a demoulding oil cylinder, which is located in the middle of the movable platen and is connected to the hydraulic integrated valve group through an oil pipe.

9. The injection molding device according to claim 1, characterized in that: The fixed mold plate is connected to the tail plate through a pull rod passing through the movable mold plate. The tail plate drives the movable mold plate on the pull rod through a mold adjusting device. Mold shifting cylinders are provided on both sides of the tail plate. The piston rods of the mold shifting cylinders are fixed to both sides of the movable mold plate. The mold thickness is adjusted by the mold adjusting device, the movable mold plate is quickly shifted by the mold shifting cylinder, and high-pressure mold locking is performed by the mold locking cylinder.

10. An injection molding device according to claim 9, characterized in that: The mold adjusting device includes a mold adjusting gear arranged in the middle of the side surface of the tail plate, a mold adjusting motor driving the mold adjusting gear, and a mold adjusting stud connected to the mold adjusting gear. The mold adjusting stud is connected to the pull rod so that the mold adjusting motor drives the mold adjusting gear and the mold adjusting stud to rotate and cause axial displacement, thereby pushing the tail plate and / or the movable mold plate to cause axial displacement, so as to adjust the mold thickness and the clamping force.

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