Left-right linkage limiting and stabilizing device of vertical injection molding machine

Abstract

The invention 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. The driving cylinder and the anti-torsion assembly are both installed on the machine column assembly, and the driving cylinder is used for driving an upper die to be opened and closed. The anti-torsion assembly is used for resisting torsion generated by the driving cylinder; the anti-torsion assembly comprises a limiting plate and an impedance piece; the limiting plate is installed on the machine column assembly, a V-shaped groove is formed in the limiting plate, and the impedance piece is installed in the V-shaped groove and used for resisting huge impact force generated by the limiting plate on the machine column assembly. Strong and directional anti-torsion and anti-lateral force are generated instantly at the moment of die opening impact, so that the torsion trend of the mounting seat is effectively inhibited, accumulated deviation is eliminated, and the fundamental problem of dislocation of an upper die and a lower die is thoroughly solved.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding machines, and in particular relates to a left-right linkage limiting stabilizing device of a vertical injection molding machine. Background Art

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

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

[0004] In traditional designs, the mold mount is typically fixed to the machine frame or movable platen via a single-point connection via a support shaft. This connection performs adequately for forces along the support shaft, but is very weak against moments perpendicular to the axis. When the enormous impact force of mold opening acts on the mount, this force often does not strictly pass through the centerline of the support shaft, resulting in a significant deflection torque on the mount.

[0005] Under the repeated impact torque of mold opening, the cylinder mold mounting base and its supporting structure will undergo slight elastic or even plastic deformation. Although this deformation is small at a single time, the long-term accumulation will cause the mounting base to have a significant torsional deviation from its initial position; that is, the mounting base no longer maintains the ideal horizontal or vertical posture, but instead twists. In addition, the injection molding machine is driven by two cylinders, which increases the deviation between the two drive cylinders, ultimately causing the upper and lower molds to misalign.

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

[0007] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a left-right linkage limit stabilization device for a vertical injection molding machine, which solves the problem that when the existing vertical injection molding machine is subjected to a huge impact force at the moment of mold opening, the cylinder mold mounting seat adopts a single-point connection method, which is prone to generate deflection torque and cause cumulative torsional deviation of the mounting seat, thereby destroying the synchronization of the dual-cylinder drive and ultimately causing upper / lower mold misalignment.

[0008] The purpose of the present invention can be achieved through the following technical solutions: A left-right linkage limit stabilization device for a vertical injection molding machine, comprising 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 mold; the anti-torsion assembly is used to resist torsion generated by the drive cylinder; The anti-torsion assembly includes a limit plate and an impedance member; the limit plate is installed on the machine column assembly, the limit plate is provided with a V-shaped groove, and the impedance member is installed in the V-shaped groove to resist the huge impact force generated by the limit plate on the machine column assembly.

[0009] Preferably, the impedance element is a non-Newtonian fluid.

[0010] Preferably, the machine column assembly includes a plurality of columns and mounting seats, and a plurality of the columns are installed on the injection molding machine body with the injection surface vertical; at least two of the columns are connected to the mounting seats, and the mounting seats are located at the top of the columns, and the mounting seats are connected to the fixed end of the driving cylinder, and the upper template is slidably installed with the plurality of the columns, and the movable end of the driving cylinder is connected to the upper template, and the upper template is located at the bottom of the mounting seat.

[0011] 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 shape of the assembly groove is an arc shape.

[0012] Preferably, the limit plate is also provided with an abutment groove running through the main body, the fixed end of the driving cylinder is installed in the abutment groove and protrudes from the lower part of the abutment groove, and the limit plate is located at the bottom of the mounting seat, which is used to withstand the mold opening and impact force and transmit it to the mounting seat.

[0013] Preferably, the anti-torsion assembly also includes a support rod, which is arranged between the limit plate and the mounting seat. There are at least two support rods, and the support rod, the limit plate, the mounting seat and the column form a four-sided support structure; the cross-section of the support rod is a rectangular structure.

[0014] Preferably, a sealing assembly is further included, which is arranged 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-shaped groove faces the column so that the impedance member contacts the column. The sealing assembly includes a sealing cover plate and a sealing ring; the sealing ring is respectively arranged at the upper and lower ends of the limiting plate and is coaxially arranged with the column. The sealing cover plate is used to fix the sealing ring to the limiting plate.

[0015] Preferably, there are two driving cylinders, and the two driving cylinders are connected via the limiting plate.

[0016] Preferably, it also includes a dynamic compensation diaphragm, which is arranged on the wall of the V-shaped groove and adheres to the surface of the non-Newtonian fluid. The dynamic compensation diaphragm includes a steel sheet and a polyurethane layer arranged on the steel sheet, and the polyurethane layer is located between the impedance member and the steel sheet.

[0017] The beneficial effects of the present invention are: This application utilizes a limit plate with a V-groove and a special impedance part to form a rigid wedge block, which instantly generates a strong, directional anti-torsion and anti-lateral force at the moment of mold opening impact, effectively suppressing the torsional tendency of the mounting seat, eliminating cumulative deviations, and thus completely solving the fundamental problem of upper and lower mold misalignment; by preventing the cumulative torsional deviation of the mounting seat, it greatly reduces the fatigue damage, deformation or failure risk of related connecting parts, the drive cylinder itself and the mold guide components due to long-term exposure to abnormal torsional loads, thereby extending the service life of key components. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a front view structural diagram of a left-right linkage limit stabilization device provided in one embodiment of the present invention; Figure 2 This is a schematic side cross-sectional view of the left-right linkage limit stabilization device provided in one embodiment of the present invention; Figure 3 A schematic diagram of the structure of a limiting plate provided in one embodiment of the present invention; Figure 4 A schematic diagram of the coordination structure between the limiting plate and the impedance member provided in one embodiment of the present invention; Figure 5 A schematic diagram of the installation structure of a sealing assembly provided in one embodiment of the present invention; Legend: 1. Mounting seat; 2. Support rod; 3. Limiting plate; 31. Abutment groove; 32. V-shaped groove; 33. Assembly groove; 4. Driving cylinder; 5. Upper template; 6. Column; 7. Dynamic compensation diaphragm; 81. Steel sheet; 82. Polyurethane layer. DETAILED DESCRIPTION

[0020] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0021] The key drawback of the existing technology is that the huge 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 the mounting base 1 to undergo small, cumulative torsional deviations, disrupting the synchronization of the dual-cylinder drive and ultimately causing the upper and lower molds to misalign.

[0022] like Figure 1-Figure 5 As shown, a left-right linkage limit stabilization 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 mold; the anti-torsion assembly is used to resist the torsion generated by the drive cylinder 4; When the drive cylinder 4 drives the upper mold to open the mold, a huge impact force is generated at the moment of mold opening. If the existing drive cylinder 4 and the column 6 are installed at a single point, the huge impact force causes the drive cylinder 4 to act on the mounting base 1, and causes the mounting base 1 to generate a torsional force. Over time, the mounting base 1 will deviate.

[0023] The anti-torsion assembly includes a limit plate 3 and an impedance member; the limit plate 3 is installed on the machine column assembly, and the limit plate 3 is also connected to the drive cylinder 4, so that the impact force first acts on the limit plate 3, and then acts on the mounting seat 1 after being weakened by the limit plate 3, and the limit plate 3 is provided with a V-shaped groove 32, and the impedance member is installed in the V-shaped groove 32, which is used to resist the huge impact force generated by the limit plate 3 on the machine column assembly. The V-shaped inclined plane 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 member 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 member instantly and strongly restrains the torsional trend and lateral displacement of the cylinder mold mounting seat 1.

[0024] In summary, the present application utilizes a limiting plate 3 with a V-groove 32 and a special impedance member to form a rigid wedge block, which instantly generates a strong, directional anti-torsion and anti-lateral force at the moment of mold opening impact, effectively suppresses the torsional tendency of the mounting seat 1, eliminates the cumulative deviation, and thus completely solves the fundamental problem of upper and lower mold misalignment; by preventing the cumulative torsional deviation of the mounting seat 1, it greatly reduces the fatigue damage, deformation or failure risk of related connecting parts, the drive cylinder 4 itself and the mold guide components due to long-term exposure to abnormal torsional loads, thereby extending the service life of key components.

[0025] In one embodiment, the impedance element is a non-Newtonian fluid. When the mold is closed, moving at a low speed or in a stable state, the viscosity of the fluid 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 viscosity of the fluid increases instantly. In particular, when the limit plate 3 is subjected to the impact force and the column 6 component has a twisting tendency, the non-Newtonian fluid is subjected to huge pressure and shear deformation, and will absorb and dissipate 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 entire machine.

[0026] In one embodiment, the machine column assembly includes several columns 6 and a mounting base 1. Several columns 6 are installed on the injection molding machine body with the injection surface vertical to ensure that the direction of mold clamping 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, and the mounting base 1 is located at the top of the column 6. The mounting base 1 is located at the top of the column 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, and the upper template 5 is slidably installed with several columns 6. The movable end of the drive cylinder 4 is connected to the upper template 5. The upper template 5 is located at the bottom of the mounting base 1. The upper template 5 slides with the column 6 and is 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 injection molding machine body along the axial direction of the column 6 to avoid lateral bending moment. The top layout of the mounting base 1 enhances the overall anti-overturning ability and reduces vibration at the moment of mold opening.

[0027] In one embodiment, the column 6 is cylindrical, and the limit plate 3 is further provided with an assembly groove 33. The V-groove 32 is connected to the assembly groove 33 to form a composite structure of "V-shaped positioning + arc support". The V-groove 32 provides axial positioning, and the arc groove bears radial load. The two have clear division of labor to avoid the over-constraint problem of a single groove type. The assembly groove 33 is in the shape of an arc, and the arc surface and the cylindrical surface are assembled to ensure the stable support effect of the limit plate 3 and the column 6, make up for the tiny contact point between the V-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 contact surface wear.

[0028] In one embodiment, the limiting plate 3 is further provided with an abutment groove 31 running through the main body, and the fixed end of the driving 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 driving cylinder 4 is embedded in the groove and protrudes, so that the mold opening impact force directly acts 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 withstand 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 from being transmitted 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.

[0029] In one embodiment, the anti-torsion component also includes a support rod 2, which is arranged between the limit plate 3 and the mounting seat 1. The number of support rods 2 is at least two. The support rod 2, the limit plate 3, the mounting seat 1 and the column 6 form a four-sided support structure, which limits the six degrees of freedom of the mounting seat 1 through spatial geometric constraints. The tetrahedron structure forms a torque balance system. When the mounting seat 1 is subjected to a deflection torque, the support rod 2 generates a reverse bending moment, and converts the torque into an axial force through a lever effect, thereby offsetting the rotation trend and limiting the translation and rotational degrees of freedom of the mounting seat 1 to eliminate cumulative deviations. 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 seat 1.

[0030] In one embodiment, a sealing assembly is further included, which is arranged on the upper and lower sides of the limit plate 3 and is used to seal between the limit plate 3 and the column 6. The opening of the V-shaped groove 32 faces the column 6, so that the impedance member contacts the column 6. The sealing assembly includes a sealing cover plate and a sealing ring; the sealing ring is respectively arranged at the upper and lower ends of the limit plate 3 and is coaxial with the column 6. The sealing ring adopts an annular structure coaxial with the column 6, and precise positioning is achieved through the annular grooves at the upper and lower ends of the limit plate 3. The inner diameter of the sealing ring maintains an interference fit of 0.1-0.2mm with the outer diameter of the column 6 to form an initial preload force. The sealing cover plate is connected to the limit plate 3 by bolts, and axial pressure is applied to cause the sealing ring to expand radially, thereby converting the line contact of the sealing ring into surface contact.

[0031] In one embodiment, two drive cylinders 4 are connected by a stop plate 3. The stop plate 3 serves as a rigid connector, physically connecting the piston rod ends of the two independent drive cylinders 4, forming a "quasi-parallel mechanism." During the mold opening and closing process, the displacement change of one drive cylinder 4 is directly transmitted to the other drive cylinder 4 through the stop plate 3, forcing the motion trajectories of the two to synchronize. Traditional electrical synchronization control suffers from signal transmission delays. When a single drive cylinder 4 experiences displacement deviation due to load fluctuations, the bidirectional restraining force of the stop plate 3 immediately generates a corrective torque. The two drive cylinders 4, the stop plate 3, and the machine column assembly together form a quadrilateral mechanical closed loop. Under the impact load of mold opening, the impact force exerted on the single drive cylinder 4 is transmitted through the stop plate 3 to form an internal force loop, preventing structural deformation caused by force leakage.

[0032] In one embodiment, a dynamic compensation diaphragm 7 is further included. The dynamic compensation diaphragm 7 is arranged on the groove wall of the V-shaped groove 32 and is attached to the surface of the non-Newtonian fluid. The dynamic compensation diaphragm 7 includes a steel sheet 81 and a polyurethane layer 82 arranged on the steel sheet 81. The polyurethane layer 82 is located between the impedance member 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 to prevent the fluid from being squeezed and deformed. In the initial stage of impact, the non-Newtonian fluid solidifies instantly due to shear force, and the steel sheet 81 layer bears the rigid impact of the solidified body. The non-Newtonian fluid is subjected to the mold opening impact load, and its molecular chains are instantly entangled and solidified under the action of shear force, forming a solid-like rigid body. At this time, the steel sheet 81 layer acts as a rigid carrier, directly bearing the impact energy of the solidified fluid. Its high rigidity characteristics evenly convert the impact load originally concentrated in the local area of ​​the V-shaped groove 32 into a surface load covering the entire groove wall contact surface, avoiding structural deformation caused by local stress concentration. The polyurethane layer 82 absorbs high-frequency vibration components through elastic compression deformation, and its molecular chain segments produce entanglement-slip motion under the action of shock waves, converting mechanical energy into heat energy through intermolecular friction. In this process, the steel sheet 81 layer acts as a rigid constraint to limit excessive deformation of the polyurethane layer 82 and prevent geometric instability of the groove wall due to creep of the elastomer. As can be seen, this embodiment utilizes a rigid-flexible coupling design of the dynamic compensation diaphragm 7, transforming the "passive bearing" of a traditional rigid limiter structure into an "active dissipation and reset" mechanism. This creates a multi-stage buffering system: "fluid solidification energy absorption → load distribution on the steel sheet 81 → polyurethane vibration attenuation → elastic reset" within the mold opening impact energy transmission path.

[0033] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A left-right linkage limiting stabilization device for a vertical injection molding machine, characterized in that: It includes a machine column assembly, a driving cylinder and an anti-torsion assembly; the driving cylinder and the anti-torsion assembly are both installed on the machine column assembly, the driving cylinder is used to drive the upper mold to open and close the mold; the anti-torsion assembly is used to resist the torsion generated by the driving cylinder; The anti-torsion assembly includes a limit plate and an impedance member; the limit plate is installed on the machine column assembly, the limit plate is provided with a V-shaped groove, and the impedance member is installed in the V-shaped groove to resist the huge impact force generated by the limit plate on the machine column assembly.

2. The left-right linkage limiting stabilization device of a vertical injection molding machine according to claim 1, characterized in that: The impedance element is a non-Newtonian fluid.

3. The left-right linkage limiting stabilization device of a vertical injection molding machine according to claim 1, characterized in that: The machine column assembly includes several columns and mounting seats, several of the columns are installed on the injection molding machine body and the injection surface is vertical; at least two of the columns are connected to the mounting seats, the mounting seats are located at the top of the columns, the mounting seats are connected to the fixed ends of the driving cylinders, the upper template is slidably installed with several of the columns, the movable end of the driving cylinder is connected to the upper template, and the upper template is located at the bottom of the mounting seats.

4. The left-right linkage limiting stabilization device of a vertical injection molding machine according to claim 3, characterized in that: The column is cylindrical in shape, the limiting plate is further provided with an assembly groove, the V-shaped groove is communicated with the assembly groove, and the shape of the assembly groove is an arc shape.

5. The left-right linkage limiting stabilization device of a vertical injection molding machine according to claim 3, characterized in that: The limiting plate is also provided with an abutment groove running through the main body, the fixed end of the driving cylinder is installed in the abutment groove and protrudes from the lower part of the abutment groove, and the limiting plate is located at the bottom of the mounting seat, and is used to withstand the mold opening and impact force and transmit it to the mounting seat.

6. The left-right linkage limiting stabilization device of a vertical injection molding machine according to claim 3, characterized in that: The anti-torsion assembly also includes a support rod, which is arranged between the limit plate and the mounting seat. There are at least two support rods, and the support rod, the limit plate, the mounting seat and the column form a four-sided support structure; the cross-section of the support rod is a rectangular structure.

7. The left-right linkage limiting stabilization device of a vertical injection molding machine according to claim 2, characterized in that: It also includes a sealing component, which is arranged on the upper and lower sides of the limit plate and is used to seal between the limit plate and the column. The opening of the V-shaped groove faces the column so that the impedance member contacts the column. The sealing component includes a sealing cover plate and a sealing ring; the sealing ring is respectively arranged at the upper and lower ends of the limit plate and is coaxially arranged with the column. The sealing cover plate is used to fix the sealing ring on the limit plate.

8. The left-right linkage limiting stabilizing device of a vertical injection molding machine according to claim 1, characterized in that: There are two driving cylinders, and the two driving cylinders are connected via the limiting plate.

9. The left-right linkage limiting stabilization device of a vertical injection molding machine according to claim 2, characterized in that: It also includes a dynamic compensation diaphragm, which is arranged on the V-shaped groove wall and adheres to the surface of the non-Newtonian fluid. The dynamic compensation diaphragm includes a steel plate and a polyurethane layer arranged on the steel plate, and the polyurethane layer is located between the impedance member and the steel plate.

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