A left-right linkage limiting and stabilizing device of a vertical injection molding machine

Abstract

The application relates to a left-right linkage limiting and stabilizing device of a vertical injection molding machine, and belongs to the technical field of injection molding machines, which comprises a machine column assembly, a driving cylinder and a torsion resisting assembly. The driving cylinder and the torsion resisting assembly are both installed on the machine column assembly, the driving cylinder is used for driving the opening and closing of an upper mold, and the torsion resisting assembly is used for resisting the torsion of the driving cylinder. The torsion resisting assembly comprises a limiting plate and a resisting piece. The limiting plate is installed on the machine column assembly, the limiting plate is provided with a V-shaped groove, and the resisting piece is installed in the V-shaped groove and used for resisting the huge impact force generated by the limiting plate on the machine column assembly. The application utilizes the limiting plate with the V-shaped groove and the special resisting piece to form a rigid wedge, so that strong and directional anti-torsion and anti-lateral force are generated at the moment of the opening impact, the torsion trend of the mounting seat is effectively inhibited, the accumulated deviation is eliminated, and the fundamental problem of the misalignment of the upper and lower molds is solved.

Description

Technical Field

[0001] This invention belongs to the field of injection molding machine technology, specifically relating to a left-right linkage limiting and stabilizing device for a vertical injection molding machine. Background Technology

[0002] Vertical injection molding machines are core equipment in the plastics processing industry, widely used in electronics, electrical appliances, medical devices, and daily necessities. Their core working principle involves injecting molten plastic raw material into a closed mold cavity under high pressure through an injection system. After cooling and solidification, the mold opens and the material is ejected, ultimately forming the desired plastic product. In the entire injection molding cycle, mold closing and opening are two crucial stages. The smoothness, precision, and synchronization of these two actions directly determine the molding quality of the product, production efficiency, and the service life of the mold and equipment.

[0003] At the moment the mold opening action is initiated, the mold opening cylinder often needs to apply a large initial burst force to overcome the static friction force when the mold is closed, the adhesion force between the product and the cavity, and the inertia of the system itself. The huge impact force generated at this moment will be transmitted to the cylinder mold mounting base connected to it through the cylinder piston rod.

[0004] In traditional designs, the mold mounting base is typically fixed to the frame or movable template via a single-point connection using a support shaft. This connection method performs reasonably well when subjected to forces along the support shaft, but it is very weak in resisting torques perpendicular to the axis. When the enormous impact force at the moment of mold opening acts on the mounting base, this force usually does not pass precisely through the centerline of the support shaft, thus generating a significant deflection torque on the mounting base.

[0005] Under the repeated action of the mold opening impact torque, the cylinder mold mounting base and its supporting structure will undergo slight elastic or even plastic deformation. Although this deformation is small in a single instance, its long-term accumulation will lead to a non-negligible torsional deviation of the mounting base relative to its initial position; that is, the mounting base no longer maintains an ideal horizontal or vertical posture, but is twisted. In addition, the injection molding machine is driven by two cylinders, which increases the deviation between the two drive cylinders, ultimately causing misalignment between the upper and lower molds.

[0006] There is an urgent need for a left-right linkage limit stabilization device for a vertical injection molding machine that can effectively suppress the torsion of the mounting base and ensure the synchronous movement of the two cylinders. Summary of the Invention

[0007] To address the aforementioned problems in the existing technology, this invention provides a left-right linkage limiting and stabilizing device for a vertical injection molding machine. This device solves the problem that, under the enormous impact force at the moment of mold opening, existing vertical injection molding machines, due to the single-point connection of the cylinder mold mounting base, are prone to generating deflection torque and causing cumulative torsional deviation of the mounting base, which in turn disrupts the synchronization of the dual-cylinder drive and ultimately leads to misalignment of the upper and lower molds.

[0008] The objective of this invention can be achieved through the following technical solutions:

[0009] A left-right linkage limiting and stabilizing device for a vertical injection molding machine includes a machine column assembly, a drive cylinder, and an anti-torsion assembly; the drive cylinder and the anti-torsion assembly are both mounted on the machine column assembly, the drive cylinder is used to drive the upper mold to open and close; the anti-torsion assembly is used to resist the torsion generated by the drive cylinder;

[0010] The anti-torsion component includes a limiting plate and an impedance element; the limiting plate is installed on the machine column assembly, the limiting plate is provided with a V-shaped groove, and the impedance element is installed in the V-shaped groove to resist the huge impact force generated by the limiting plate on the machine column assembly.

[0011] Preferably, the impedance element is a non-Newtonian fluid.

[0012] Preferably, the column assembly includes a plurality of columns and a mounting base. The plurality of columns are mounted on the main body of the injection molding machine and the injection surface is perpendicular. At least two of the columns are connected to the mounting base, the mounting base is located at the top of the columns, the mounting base is connected to the fixed end of the drive cylinder, the upper template is slidably mounted to the plurality of columns, the movable end of the drive cylinder is connected to the upper template, and the upper template is located at the bottom of the mounting base.

[0013] Preferably, the column is cylindrical, the limiting plate is further provided with an assembly groove, the V-shaped groove is connected to the assembly groove, and the assembly groove is arc-shaped.

[0014] Preferably, the limiting plate also has an abutment groove extending through the body, the fixed end of the drive cylinder is installed in the abutment groove and protrudes from the lower part of the abutment groove, the limiting plate is located at the bottom of the mounting base, and is used to withstand the mold opening and impact forces and transmit them to the mounting base.

[0015] Preferably, the anti-torsion component further includes a support rod, which is disposed between the limiting plate and the mounting base. There are at least two support rods, and the support rod, the limiting plate, the mounting base, and the column form a four-sided support structure. The cross-section of the support rod is rectangular.

[0016] Preferably, it further includes a sealing assembly, which is disposed on the upper and lower sides of the limiting plate for sealing between the limiting plate and the column. The opening of the V-groove faces the column, so that the impedance element contacts the column. The sealing assembly includes a sealing cover plate and a sealing ring. The sealing ring is disposed at the upper and lower ends of the limiting plate and is coaxially disposed with the column. The sealing cover plate is used to fix the sealing ring to the limiting plate.

[0017] Preferably, there are two drive cylinders, and the two drive cylinders are connected by the limiting plate.

[0018] Preferably, it further includes a dynamic compensation diaphragm, which is disposed on the wall of the V-groove and adheres to the surface of the non-Newtonian fluid. The dynamic compensation diaphragm includes a steel sheet and a polyurethane layer disposed on the steel sheet, the polyurethane layer being located between the impedance element and the steel sheet.

[0019] The beneficial effects of this invention are as follows:

[0020] This application utilizes a limiting plate with a V-groove and special impedance components to form a rigid wedge block, which instantly generates strong, directional anti-torsional and anti-lateral forces at the moment of mold opening impact, effectively suppressing the torsional tendency of the mounting base and eliminating cumulative deviations, thereby completely solving the fundamental problem of misalignment between the upper and lower molds; by preventing the cumulative torsional deviation of the mounting base, it greatly reduces the risk of fatigue damage, deformation or failure of related connecting parts, the drive cylinder itself and the mold guide components due to long-term abnormal torsional loads, and extends the service life of key components. Attached Figure Description

[0021] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 This is a front view of the left-right linkage limiting and stabilizing device provided in one embodiment of the present invention;

[0023] Figure 2 This is a side cross-sectional view of the left-right linkage limiting and stabilizing device provided in one embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of a limiting plate structure provided in one embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the cooperation structure between the limiting plate and the impedance element provided in one embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the sealing assembly installation structure provided in one embodiment of the present invention;

[0027] Legend: 1. Mounting base; 2. Support rod; 3. Limiting plate; 31. Abutment groove; 32. V-groove; 33. Assembly groove; 4. Drive cylinder; 5. Upper template; 6. Column; 7. Dynamic compensation diaphragm; 81. Steel sheet; 82. Polyurethane layer. Detailed Implementation

[0028] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0029] The key flaw in the existing technology lies in the fact that the enormous impact force at the moment of mold opening acts on the single-point connected cylinder mold mounting base 1, generating a strong deflection torque. This torque causes a small, cumulative torsional deviation in the mounting base 1, disrupting the synchronization of the dual-cylinder drive and ultimately leading to misalignment of the upper and lower molds.

[0030] like Figures 1-5 As shown, a left-right linkage limiting and stabilizing device for a vertical injection molding machine includes a machine column assembly, a drive cylinder 4, and an anti-torsion assembly; the drive cylinder 4 and the anti-torsion assembly are both installed on the machine column assembly, the drive cylinder 4 is used to drive the upper mold to open and close; the anti-torsion assembly is used to resist the torsion generated by the drive cylinder 4.

[0031] When the drive cylinder 4 drives the upper mold to open, a huge impact force is generated at the moment of mold opening. If the existing drive cylinder 4 and column 6 are installed at a single point, the huge impact force will cause the drive cylinder 4 to act on the mounting base 1 and cause the mounting base 1 to generate a torsional force. Over time, this will cause the mounting base 1 to deviate.

[0032] The anti-torsion component includes a limiting plate 3 and an impedance element. The limiting plate 3 is installed on the machine column assembly and is also connected to the drive cylinder 4, so that the impact force acts on the limiting plate 3 first, and after the impact force is weakened by the limiting plate 3, it acts on the mounting base 1. The limiting plate 3 is provided with a V-shaped groove 32, and the impedance element is installed in the V-shaped groove 32 to resist the huge impact force generated by the limiting plate 3 on the machine column assembly. The V-shaped inclined structure decomposes the generated torsional force into a normal force perpendicular to the inclined plane and a tangential force along the inclined plane. The impedance element bears this normal pressure and resists and dissipates part of the impact force through its own physical properties. At the moment of mold opening impact, the impedance element immediately and powerfully constrains the torsional tendency and lateral displacement of the cylinder mold mounting base 1.

[0033] In summary, this application utilizes a limiting plate 3 with a V-groove 32 and a special impedance component to form a rigid wedge block, which instantly generates a strong, directional anti-torsional and anti-lateral force at the moment of mold opening impact, effectively suppressing the torsional tendency of the mounting base 1, eliminating cumulative deviation, and thus completely solving the fundamental problem of misalignment between the upper and lower molds; by preventing the cumulative torsional deviation of the mounting base 1, the risk of fatigue damage, deformation or failure of related connecting parts, the drive cylinder 4 itself and the mold guide components due to long-term abnormal torsional load is greatly reduced, and the service life of key components is extended.

[0034] In one embodiment, the impedance component is a non-Newtonian fluid. During mold closing, low-speed movement, or stable conditions, the fluid viscosity is low and does not affect the normal mold closing accuracy. When encountering a huge and rapid impact force at the moment of mold opening, the fluid viscosity increases dramatically. In particular, when the limit plate 3 is subjected to the impact force and the column 6 assembly tends to twist, the non-Newtonian fluid bears huge pressure and shear deformation, which absorbs and dissipates a large amount of impact energy. The non-Newtonian fluid can effectively absorb and dissipate energy when subjected to impact, reducing the transmission of shock waves to the machine column assembly and other basic structures, and helping to protect the whole machine.

[0035] In one embodiment, the machine column assembly includes several columns 6 and a mounting base 1. The columns 6 are mounted on the main body of the injection molding machine with the injection surface perpendicular to ensure that the direction of mold closing force transmission is consistent with the direction of gravity, reducing lateral force components. At least two columns 6 are connected to the mounting base 1, which is located at the top of the columns 6 and is rigidly connected to the fixed end of the drive cylinder 4 to form a high-rigidity support platform. The mounting base 1 is connected to the fixed end of the drive cylinder 4. The upper mold plate 5 is slidably mounted on the columns 6, and the movable end of the drive cylinder 4 is connected to the upper mold plate 5, which is located at the bottom of the mounting base 1. The upper mold plate 5 and the columns 6 are slidably engaged and directly driven by the movable end of the drive cylinder 4 to achieve precise mold opening and closing. In this way, the impact force is transmitted to the main body of the injection molding machine along the axial direction of the columns 6, avoiding lateral bending moment. The top-positioned layout of the mounting base 1 enhances the overall anti-overturning ability and reduces vibration at the moment of mold opening.

[0036] In one embodiment, the column 6 is cylindrical, and the limiting plate 3 is also provided with an assembly groove 33. The V-shaped groove 32 is connected to the assembly groove 33 to form a composite structure of "V-shaped positioning + arc support". The V-shaped groove 32 provides axial positioning, and the arc groove bears radial load. The two have a clear division of labor, avoiding the over-constraint problem of a single groove type. The assembly groove 33 is arc-shaped, and the arc surface is assembled with the cylindrical surface to ensure the stable support effect of the limiting plate 3 and the column 6, make up for the small contact points between the V-shaped groove 32 and the column 6, and ensure the stability of the drive cylinder 4 during the mold closing process. At the same time, the arc contact avoids point stress concentration and reduces the risk of wear on the contact surface.

[0037] In one embodiment, the limiting plate 3 is also provided with an abutment groove 31 through the body. The fixed end of the drive cylinder 4 is installed in the abutment groove 31 and protrudes from the lower part of the abutment groove 31. The fixed end of the drive cylinder 4 is embedded in the groove and protrudes, so that the mold opening impact force acts directly on the limiting plate 3, forming the shortest force transmission chain of "impact force → limiting plate 3 → mounting seat 1 → column 6". The limiting plate 3 is located at the bottom of the mounting seat 1 and is used to bear the mold opening and impact force and transmit it to the mounting seat 1. The impact force is intercepted by the limiting plate 3 before the deflection torque is generated, blocking the torque transmission to the mounting seat 1, avoiding the mounting seat 1 from directly bearing the impact, and preventing its connecting bolts from loosening or plastic deformation.

[0038] In one embodiment, the anti-torsion component further includes a support rod 2, which is disposed between the limiting plate 3 and the mounting base 1. There are at least two support rods 2. The support rod 2, the limiting plate 3, the mounting base 1, and the column 6 form a four-sided support structure. The six degrees of freedom of the mounting base 1 are restricted by spatial geometric constraints. The tetrahedral structure forms a torque balance system. When the mounting base 1 is subjected to deflection torque, the support rod 2 generates a reverse bending moment. Through the leverage effect, the torque is converted into axial force, thereby counteracting the rotational tendency. At the same time, the translational and rotational degrees of freedom of the mounting base 1 are restricted, eliminating cumulative deviation. The cross-section of the support rod 2 is a rectangular structure with high bending stiffness, which can resist the horizontal displacement of the mounting base 1.

[0039] In one embodiment, a sealing assembly is also included. The sealing assembly is disposed on the upper and lower sides of the limiting plate 3 and is used to seal the space between the limiting plate 3 and the column 6. The opening of the V-groove 32 faces the column 6, so that the impedance element contacts the column 6. The sealing assembly includes a sealing cover plate and a sealing ring. The sealing ring is disposed on the upper and lower ends of the limiting plate 3 and is coaxial with the column 6. The sealing ring adopts an annular structure coaxial with the column 6. Precise positioning is achieved through the annular grooves at the upper and lower ends of the limiting plate 3. The inner diameter of the sealing ring and the outer diameter of the column 6 maintain an interference fit of 0.1-0.2mm to form an initial preload. The sealing cover plate is connected to the limiting plate 3 by bolts to apply axial pressure, causing the sealing ring to expand radially and converting the line contact of the sealing ring into a surface contact.

[0040] In one embodiment, there are two drive cylinders 4, connected by a limiting plate 3. The limiting plate 3 acts as a rigid connector, physically connecting the piston rod ends of the two independent drive cylinders 4 to form a "quasi-parallel mechanism." During mold opening and closing, any displacement change in drive cylinder 4 is directly transmitted to the other drive cylinder 4 through the limiting plate 3, forcibly synchronizing their motion trajectories. Traditional electrical synchronization control suffers from signal transmission delay. When a single drive cylinder 4 experiences displacement deviation due to load fluctuations, the bidirectional constraint force of the limiting plate 3 immediately generates a corrective torque. The two drive cylinders 4, the limiting plate 3, and the machine column assembly together form a quadrilateral mechanical closed loop. Under the impact load of mold opening, the impact force borne by a single drive cylinder 4 forms an internal force loop through the limiting plate 3, preventing structural deformation caused by force leakage.

[0041] In one embodiment, a dynamic compensation diaphragm 7 is also included. The dynamic compensation diaphragm 7 is disposed on the wall of the V-groove 32 and attached to the surface of the non-Newtonian fluid. The dynamic compensation diaphragm 7 includes a steel sheet 81 and a polyurethane layer 82 disposed on the steel sheet 81. The polyurethane layer 82 is located between the impedance element and the steel sheet 81. The polyurethane layer 82 is used to absorb the high-frequency shock waves that are not dissipated by the non-Newtonian fluid. The steel sheet 81 is used to maintain the flatness of the groove wall and prevent the fluid from being squeezed and deformed.

[0042] In the initial impact phase, the non-Newtonian fluid solidifies instantaneously under shear force. The steel sheet 81 layer bears the rigid impact of the solidified body. Under the impact load of the mold opening, the molecular chains of the non-Newtonian fluid become instantly entangled and solidified under shear force, forming a near-solid rigid body. At this point, the steel sheet 81 layer acts as a rigid carrier, directly bearing the impact energy of the solidified fluid. Its high stiffness transforms the impact load, originally concentrated in a localized area of ​​the V-groove 32, into a surface load covering the entire groove wall contact surface, preventing structural deformation caused by localized stress concentration. The polyurethane layer 82 absorbs high-frequency vibration components through elastic compression deformation. Its molecular chain segments undergo entanglement-slip motion under the impact wave, converting mechanical energy into heat energy through intermolecular friction. During this process, the steel sheet 81 layer acts as a rigid constraint, limiting excessive deformation of the polyurethane layer 82 and preventing geometric instability of the groove wall due to elastomer creep.

[0043] As can be seen, this embodiment transforms the "passive bearing" of the traditional rigid limiting structure into an "active dissipation-reset" mechanism through the dynamic compensation diaphragm 7 and its rigid-flexible coupling design. In the mold opening impact energy transmission path, a multi-level buffer system is formed, consisting of "fluid solidification energy absorption → uniform load distribution on steel sheet 81 → polyurethane vibration attenuation → elastic reset".

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A left-right linkage limiting and stabilizing device for a vertical injection molding machine, characterized in that, It includes a machine column assembly, a drive cylinder, and an anti-torsion assembly; the drive cylinder and the anti-torsion assembly are both mounted on the machine column assembly, the drive cylinder is used to drive the upper mold to open and close; the anti-torsion assembly is used to resist the torsion generated by the drive cylinder; The anti-torsion component includes a limiting plate and an impedance element; the limiting plate is installed on the machine column assembly, the limiting plate is provided with a V-groove, and the impedance element is installed in the V-groove to resist the impact force generated by the limiting plate on the machine column assembly; The impedance element is a non-Newtonian fluid; It also includes a sealing assembly, which is disposed on the upper and lower sides of the limiting plate and is used to seal between the limiting plate and the column. The opening of the V-groove faces the column, so that the impedance element contacts the column. The sealing assembly includes a sealing cover plate and a sealing ring. The sealing ring is disposed at the upper and lower ends of the limiting plate and is coaxial with the column. The sealing cover plate is used to fix the sealing ring to the limiting plate. It also includes a dynamic compensation diaphragm, which is disposed on the wall of the V-groove and adheres to the surface of the non-Newtonian fluid. The dynamic compensation diaphragm includes a steel sheet and a polyurethane layer disposed on the steel sheet, the polyurethane layer being located between the impedance element and the steel sheet.

2. The left-right linkage limiting and stabilizing device for a vertical injection molding machine according to claim 1, characterized in that, The column assembly includes several columns and mounting bases. The columns are mounted on the main body of the vertical injection molding machine with the injection surface perpendicular. At least two columns are connected to the mounting bases, which are located at the top of the columns. The mounting bases are connected to the fixed end of the drive cylinder. The upper template is slidably mounted on the columns. The movable end of the drive cylinder is connected to the upper template, which is located at the bottom of the mounting base.

3. The left-right linkage limiting and stabilizing device for a vertical injection molding machine according to claim 2, characterized in that, The column is cylindrical, and the limiting plate is also provided with an assembly groove. The V-shaped groove is connected to the assembly groove, and the assembly groove is arc-shaped.

4. The left-right linkage limiting and stabilizing device for a vertical injection molding machine according to claim 2, characterized in that, The limiting plate also has an abutment groove through the body. The fixed end of the drive cylinder is installed in the abutment groove and protrudes from the lower part of the abutment groove. The limiting plate is located at the bottom of the mounting base. The limiting plate is used to withstand the mold opening and impact forces and transmit them to the mounting base.

5. The left-right linkage limiting and stabilizing device for a vertical injection molding machine according to claim 2, characterized in that, The anti-torsion component also includes a support rod, which is disposed between the limiting plate and the mounting base. There are at least two support rods, and the support rod, the limiting plate, the mounting base, and the column form a four-sided support structure. The cross-section of the support rod is rectangular.

6. The left-right linkage limiting and stabilizing device for a vertical injection molding machine according to claim 1, characterized in that, There are two drive cylinders, and the two drive cylinders are connected by the limiting plate.

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