Seat armrest injection molding equipment

Abstract

The invention relates to the technical field of special product injection molding, and discloses seat armrest injection molding equipment which comprises an injection molding machine, a static female die and a movable male die are installed on the surface of the injection molding machine, and the injection molding machine drives the movable male die to be precisely closed with the static female die in the die closing direction to form a complete injection molding cavity. Molten plastic raw materials are injected into a cavity through an injection molding system, forming of the seat armrest is achieved after pressure maintaining, cooling and curing are conducted, a variable forming assembly is integrated in a movable male die, and by integrating the variable forming assembly, the purpose that armrests matched with different frames can be produced without replacing a die body is achieved. The semicircular male die of the basic module can form a circular frame adaptive armrest, and the semi-rectangular male die of the sideslip module can be spliced into a rectangular male die after wrapping the semicircular male die in a centripetal sliding mode, so that production of square frame adaptive armrests is met, frame specification differences caused by multiple scene requirements of seats of the same batch are effectively dealt with, and production flexibility is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of special product injection molding, in particular to a seat armrest injection molding equipment. BACKGROUND

[0002] Office chairs, as high-frequency furniture in office space, need to consider structural strength, ergonomic adaptability and production flexibility. In traditional production, the seat metal frame is mainly composed of pipe materials, which is formed through cutting, welding and surface treatment processes. By adjusting the pipe specifications and welding points, it can adapt to different height and width office scene requirements. However, the armrests that match the metal frame often use injection molding process because they need to precisely fit the frame mounting interface (such as round / square pipe interface). This type of armrest, as a highly dependent customized injection molding equipment, needs to strictly match the exclusive shape and installation features of the metal frame to ensure assembly stability and ergonomic experience.

[0003] However, in the batch production of office chairs, the same batch of products need to adapt to multiple use scenarios (such as standard chairs in open office areas and customized chairs in manager's rooms), which requires the use of two or more specifications of metal frames (such as round pipe frames for regular needs and square pipe frames for manager's chairs to strengthen structural recognition). To ensure the overall assembly consistency of the chair, the armrests need to be produced simultaneously. The armrests that adapt to round pipe frames need to be formed with annular groove interfaces, and the armrests that adapt to square pipe frames need to be formed with right-angle slot structures.

[0004] However, the existing injection molding equipment has significant pain points. Conventional injection molding machines are designed for single-mold shapes. After producing round pipe-adapted armrests, switching to square pipe-adapted armrests requires replacing the entire mold, which not only takes time (2-4 hours per mold replacement and debugging) and increases mold costs (more than 100,000 yuan for multiple-specification molds), but also easily causes large gaps between the armrests and the frames due to mold positioning deviations (when the gap is greater than 0.5 mm, the armrests are prone to looseness and abnormal noise). Additionally, due to the complex surface of the armrests and the need to ensure ergonomic feel (surface roughness Ra≤0.8 μm, arc error ≤±1°), traditional equipment has difficulty in accurately compensating for material shrinkage during the pressure maintenance and cooling stages, resulting in low product yield (≤85%). This not only increases production costs but also affects the overall quality and brand reputation of office chairs.

[0005] Therefore, the present application provides a seat armrest injection molding equipment. SUMMARY

[0006] The present application aims to provide a seat armrest injection molding equipment to solve the problems raised in the background.

[0007] In order to achieve the above object, the application provides the following technical scheme: a seat armrest injection molding equipment for producing customized seat armrest special products suitable for multiple frames, comprising an injection molding machine, a static concave mold and a dynamic convex mold are respectively mounted on the surface of the injection molding machine, the dynamic convex mold is driven by the injection molding machine to precisely close with the static concave mold in the mold closing direction, forming a complete injection molding cavity, and molten plastic raw materials are injected into the cavity through an injection molding system, and after pressure maintaining and cooling and solidification, the molding of the seat armrest is realized, a variable forming assembly is integrated in the dynamic convex mold, the assembly comprises symmetrically arranged basic modules and adaptive side slide modules, a single basic module corresponds to a group of side slide modules, the side slide modules can slide and wrap the basic modules, so that the dynamic convex mold has two customized molding forms, one is a basic injection molding form, at this time, the side slide modules are in the initial position, and the basic modules are directly exposed in the injection molding cavity, the molten plastic raw materials directly contact the molding surface of the basic modules, and after solidification, the seat armrest basic structure suitable for standard frames is formed, and the other is a composite molding form, the side slide modules slide towards the center and completely wrap the basic modules, forming a combined molding surface geometrically complementary to the basic modules, the combined molding surface has a non-standard contour suitable for different frames, and after the molten plastic raw materials fill the combined molding surface, the seat armrest special products suitable for different seat frames are formed, and the variable forming assembly switches the molding form through modularization, so that the same set of equipment can realize the customized production of seat armrests with different frames in the same batch through the plastic raw material injection molding process without replacing the mold body.

[0008] Preferably, the basic module comprises a semicircular convex mold and a driver I, the driver I is fixedly connected to the inside of the dynamic convex mold, the semicircular convex mold is fixedly connected with the output shaft of the driver I, the side slide module comprises two semirectangular convex molds and a driver II, the driver II is fixedly connected to the inside of the dynamic convex mold, and the telescopic movement of the driver II can drive the semirectangular convex molds to slide in the radial direction, so that the two semirectangular convex molds are attached to the curved surface of the semicircular convex mold, and the switching of the dynamic convex mold from the basic form to the composite form is realized.

[0009] Preferably, the semicircular convex mold has a semicircular structure and is used for molding the seat armrest suitable for a circular frame, the inner arc surface of the semirectangular convex mold is complementary to the outer surface shape of the semicircular convex mold, and the outer side surface is a plane structure, when the two semirectangular convex molds are attached to the surface of the semicircular convex mold, the three are spliced to form a rectangular convex mold form, which is used for molding the seat armrest suitable for a square frame.

[0010] Preferably, the basic module further comprises four avoidance cavities, each two avoidance cavities are symmetrically arranged on the side of the semicircular convex mold away from the static concave mold, a side avoiding plate is movably connected in each avoidance cavity, and a spring is fixedly connected between the side avoiding plate and the inner wall of the avoidance cavity, in the basic injection molding form, the side avoiding plate completely blocks the opening of the avoidance cavity under the action of the spring elastic force, and is flushly attached to the outer surface of the semicircular convex mold, so as to ensure that the molten plastic raw materials are uniformly filled in the cavity.

[0011] Preferably, the side sliding module further comprises an L-shaped side plate corresponding to each half-rectangular mold, which is fixedly connected to the inner side of the half-rectangular mold, and an outer slide is formed in the inner side of the L-shaped side plate. The output shaft of the second driver is slidingly connected to the outer slide. When the second driver is elongated, the output shaft drives the L-shaped side plate to drive the half-rectangular mold to slide towards the center through the outer slide. The circular arc end of the L-shaped side plate abuts against the side plate and compresses the spring, so that the side plate is retracted into the avoiding cavity. At the same time, the half-rectangular mold is attached to the surface of the half-circular mold, and the L-shaped side plate is embedded in the avoiding cavity to complete the space avoiding.

[0012] Preferably, the surface of the output shaft of the second driver is fixedly connected with two limiting discs, and the inner side of the outer slide is formed with an inner slide matched with the limiting disc. Each second driver drives two L-shaped side plates to move synchronously through the sliding cooperation of the limiting disc and the inner slide. Each second driver drives the L-shaped side plate directly connected thereto and the L-shaped side plate adjacent thereto, so that the two groups of half-rectangular molds are symmetrically attached to the half-circular mold.

[0013] Preferably, the upper and lower side walls of each avoiding cavity are fixedly connected with sliding strips, and the upper and lower ends of each side plate are correspondingly formed with sliding grooves. The sliding strips and the sliding grooves slidingly cooperate, which limits the movement direction of the side plate, ensures the stable extension and retraction of the side plate under the action of the spring, and provides guidance when the side sliding module switches the mode, so as to prevent the side plate from deviating and affecting the molding precision.

[0014] Preferably, the upper and lower sides of the L-shaped side plate are correspondingly formed with sliding grooves, and the sliding grooves slidingly cooperate with the sliding strips on the side walls of the avoiding cavity. The sliding cooperation structure provides guidance and limiting for the L-shaped side plate embedded in the avoiding cavity in the composite molding mode, and ensures that the half-rectangular mold remains stable during the attachment to the half-circular mold, so as to avoid the fitting error of the molding surface caused by lateral displacement.

[0015] Preferably, the second driver and the first driver are both air cylinders, and the second driver and the first driver are controlled by an external controller. The external controller is pre-set with a switching program of the basic injection molding mode and the composite molding mode. The controller adjusts the extension stroke, air pressure and action timing of the air cylinder in real time according to the production requirements of the seat armrest.

[0016] Preferably, the half-circular mold and the half-rectangular mold are both provided with a material overflow preventing extension part along the injection molding cavity direction. The material overflow preventing extension part is a protruding structure extending outward from the rear end of the half-circular mold and the rear end of the half-rectangular mold, and the radial dimension is greater than the installation gap of the variable forming assembly in the inner part of the movable mold. In the injection molding process, the material overflow preventing extension part tightly abuts against the inner wall of the cavity of the movable mold to form a sealing surface, which blocks the penetration of the molten plastic material into the variable forming assembly movement space in the inner part of the movable mold.

[0017] Preferably, the movable punch and static die surface are embedded with nanoscale external pressure sensor arrays, and the external sensor arrays are signal connected with an external controller, and during the injection molding pressure maintaining stage, the controller adjusts the micro displacement of the driver one and the driver two in real time according to the pressure distribution data in the cavity fed back by the sensor, compensates the deformation of the molding surface caused by the shrinkage of the raw material, and ensures the molding precision of the special seat armrest product.

[0018] Preferably, the displacement compensation amount of the driver one and the driver two is limited to ±0.1mm (single adjustment ≤0.02mm), and the compensation action frequency is ≤5 times / second, which avoids damaging the molding assembly due to frequent and large adjustment, and at the same time guarantees the stability of the injection molding cycle (single cycle compensation time ≤0.5s).

[0019] Preferably, the surface roughness Ra of the anti-overflow extension is ≤0.6μm, and the cooperation gap between the anti-overflow extension and the movable punch cavity inner wall is ≤0.05mm; this high-precision cooperation not only blocks the raw material from penetrating, but also provides a stable 'force transmission boundary' for pressure compensation - when the driver one and the driver two are finely adjusted, the anti-overflow extension can ensure that the pressure change in the cavity accurately acts on the molding surface, avoiding compensation failure caused by pressure leakage, and cooperating with the nanoscale pressure sensor array to guarantee the molding precision of the special product.

[0020] Compared with the prior art, the beneficial effects of the present application are:

[0021] 1. By integrating a variable molding assembly, it is realized that different frame-adapted armrests can be produced without replacing the main mold, and the equipment includes a basic module and a side sliding module, the semicircular punch of the basic module can form a circular frame-adapted armrest, and after the semicircular punch is wrapped by the semicircular punch of the side sliding module which slides centripetally, a rectangular punch can be spliced to meet the production of square frame-adapted armrests, effectively dealing with the frame specification differences of the same batch of seats due to multi-scene requirements, and guaranteeing production flexibility.

[0022] 2. The semicircular punch of the basic module is directly exposed to the injection molding cavity, and the side plates in the four avoiding cavities are flush with the outer surface of the semicircular punch under the action of the spring, ensuring that the molten plastic raw material is uniformly filled in the cavity. This structural design avoids the trouble of frequent mold replacement for producing different frame-adapted armrests due to the single form of the mold in traditional equipment, making the production process of circular frame-adapted armrests simple and efficient, and stably guaranteeing the armrest molding quality, which meets the production needs of the conventional workstations of office chairs.

[0023] 3. When producing square frame matching handrails, the equipment's form switching process is accurate and stable, the driver one retracts to drive the semicircular convex die to retreat, reserving space for the side sliding module to act, the driver two drives the L-shaped side plate to move the semicircle convex die to the center through the cooperation of the limiting disc and the L-shaped side plate inner slide, the L-shaped side plate arc end compresses the spring to make the side plate retreat, and the L-shaped side plate itself embeds into the avoiding cavity to complete the space retreat, the sliding cooperation between the sliding groove and the sliding bar between the components ensures the stable movement direction, and the semicircle convex die can accurately fit the semicircle convex die to splice into the rectangular convex die form, which lays a structure foundation for the production of square frame matching handrails.

[0024] 4. In the injection preparation stage after the equipment switches forms, the equipment still shows strong synergy, when the driver one extends to drive the semicircle convex die to move forward, the L-shaped side plate can drive the semicircle convex die to move synchronously due to the limitation of the sliding groove two by the sliding bar, and the L-shaped side plate outer slide cooperates with the driver two limiting disc to ensure the stability of the whole movement process, the design of the cooperative movement of multiple components enables the movable convex die to accurately combine with the static concave die, which provides a stable and accurate cavity environment for the injection molding of square frame matching handrails, and ensures the smooth progress of the subsequent injection molding process.

[0025] 5. The design of the anti-overflow extension part adds a "safety lock" to the injection process, the radial size of the anti-overflow extension part at the rear end of the semicircle convex die and the semicircle convex die is greater than the installation gap of the internal components of the movable convex die, which tightly touches the inner wall of the cavity to form a sealing surface during injection, effectively blocking the molten material from penetrating into the internal components of the movable convex die, avoiding the leakage of the material affecting the equipment operation and the quality of the handrail formation, at the same time, the high-precision surface roughness and cooperation gap can also provide a stable force transmission boundary for pressure compensation, ensuring the effective operation of the subsequent precision compensation mechanism.

[0026] 6. Through the modular switching of the variable forming assembly, the multi-component cooperative movement design, the anti-overflow and pressure compensation mechanism, the equipment realizes the efficient customized production of different frame seat handrails in the same batch, solves the problems caused by the multiple frames in office chair handrail production from the aspects of production process simplification, molding quality guarantee and equipment operation stability, improves the production efficiency and product quality, and helps office chair manufacturing enterprises to better adapt to the diversified market demand and enhance the product competitiveness. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a front view of the main structure of the invention;

[0028] Figure 2 It is a three-dimensional schematic diagram of the movable convex die basic injection form of the invention;

[0029] Figure 3 It is a three-dimensional schematic diagram of the movable convex die composite forming form of the invention;

[0030] Figure 4Fig. 1 is a sectional view of a moving punch according to the present application;

[0031] Figure 5 Fig. 2 is a perspective view of a base module according to the present application;

[0032] Figure 6 Fig. 3 is a perspective view of a side slide module according to the present application; Figure 5 Fig. 4 is a perspective view of an enlarged structure at A in Fig. 3;

[0033] Figure 7 Fig. 5 is a perspective view of the side slide module according to the present application;

[0034] Figure 8 Fig. 6 is a plan view of the side slide module and the base module in motion according to the present application;

[0035] Figure 9 Fig. 7 is a perspective view of the side slide module in motion according to the present application;

[0036] Figure 10 Fig. 8 is a partial perspective view of the base module and the side slide module after motion according to the present application.

[0037] Fig. 1 is a sectional view of a moving punch according to the present application;

[0038] 1, injection molding machine; 2, static female die; 3, moving punch; 4, base module; 41, semi-circular punch; 42, avoiding cavity; 421, slide bar; 43, side avoiding plate; 431, slide groove one; 44, spring; 45, driver one; 5, side slide module; 51, semi-rectangular punch; 52, L-shaped side plate; 53, outer slide; 531, inner slide; 54, driver two; 55, limiting disc; 56, slide groove two. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0040] It should be noted that the injection molding machine 1 only provides the injection molding function for the seat armrest, the driver one 45 and the driver two 54 only provide the displacement function for the semi-circular punch 41 and the semi-rectangular punch 51, and the external pressure sensor only provides the pressure detection function. The working principles and specific structures of the above structures are all prior art. Therefore, in view of the universality of the above structures, the specific principles will not be described in detail.

[0041] Referring to Figures 1 to 10 , the present application provides an embodiment:

[0042] The utility model provides a seat armrest injection molding equipment for producing customized seat armrest special products suitable for multiple frames, which comprises an injection molding machine 1, a static female die 2 and a dynamic male die 3 are respectively installed on the surface of the injection molding machine 1, the injection molding machine 1 drives the dynamic male die 3 to precisely close with the static female die 2 in the direction of closing, forms a complete injection molding cavity, and injects molten plastic raw materials into the cavity through an injection molding system, and after pressure maintaining and cooling and solidification, the seat armrest is formed, a variable forming assembly is integrated in the dynamic male die 3, the assembly comprises symmetrically arranged basic modules 4 and suitable side slide modules 5, a single basic module 4 corresponds to a group of side slide modules 5, the side slide modules 5 can slide and wrap the basic modules 4, so that the dynamic male die 3 has two customized forming modes, one is a basic injection molding mode, at this time, the side slide modules 5 are in the initial position, and the basic modules 4 are directly exposed in the injection molding cavity, the molten plastic raw materials directly contact the forming surface of the basic modules 4, and after solidification, a seat armrest basic structure suitable for a standard frame is formed, and the other is a composite forming mode, the side slide modules 5 slide towards the center and completely wrap the basic modules 4, forming a combined forming surface geometrically complementary to the basic modules 4, the combined forming surface has a non-standard contour suitable for different frames, after the molten plastic raw materials fill the combined forming surface, seat armrest special products suitable for different seat frames are formed, and the variable forming assembly switches the mode through modularization, so that the same set of equipment can realize the customized production of seat armrests with different frames in the same batch through the plastic raw material injection molding process without replacing the mold body.

[0043] It needs to be explained that the base module 4 includes a semicircular punch 41 and a driver one 45, the driver one 45 is fixedly connected in the movable punch 3, the semicircular punch 41 is fixedly connected with the output shaft of the driver one 45, the side slide module 5 includes two half rectangular punches 51 and a driver two 54, the driver two 54 is fixedly connected in the movable punch 3, the telescopic movement of the driver two 54 can drive the half rectangular punch 51 to slide along the radial direction, so that the two half rectangular punches 51 are attached to the curved surface of the semicircular punch 41, the movable punch 3 is switched from the basic form to the compound form, the semicircular punch 41 is in a semicircular structure, which is used for forming a seat armrest matched with a circular frame, the inner arc surface of the half rectangular punch 51 is complementary to the outer surface shape of the semicircular punch 41, and the outer side surface is a plane structure, when the two half rectangular punches 51 are attached to the surface of the semicircular punch 41, the three are spliced to form a rectangular punch form, which is used for forming a seat armrest matched with a square frame, the base module 4 further includes four avoiding cavities 42, every two avoiding cavities 42 are symmetrically arranged on the side of the semicircular punch 41 away from the static recess 2, each avoiding cavity 42 movably connects a side avoiding plate 43, springs 44 are fixedly connected between the side avoiding plate 43 and the inner wall of the avoiding cavity 42, in the basic injection molding form, the side avoiding plate 43 is completely blocked to the opening of the avoiding cavity 42 under the elastic force of the spring 44, and is attached to the outer surface of the semicircular punch 41, which ensures that the molten plastic material is uniformly filled in the cavity, the side slide module 5 further includes L-shaped side plates 52 corresponding to the half rectangular punch 51, the L-shaped side plate 52 is fixedly connected to the inner side of the half rectangular punch 51, the L-shaped side plate 52 is internally provided with an outer slide 53, the output shaft of the driver two 54 is slidably connected in the outer slide 53, when the driver two 54 is elongated, the output shaft drives the L-shaped side plate 52 to drive the half rectangular punch 51 to slide towards the center through the outer slide 53, the circular arc end of the L-shaped side plate 52 abuts against the side avoiding plate 43 and compresses the spring 44, so that the side avoiding plate 43 is retracted into the avoiding cavity 42, at the same time, the half rectangular punch 51 is attached to the surface of the semicircular punch 41, and the L-shaped side plate 52 is embedded in the avoiding cavity 42 to complete the space avoiding, the surface of the output shaft of the driver two 54 is fixedly connected with two limiting discs 55, the inner slide 531 matched with the limiting disc 55 is internally arranged in the outer slide 53, each driver two 54 is driven by the limiting disc 55 and the inner slide 531 to synchronously move the two L-shaped side plates 52 respectively: each driver two 54 drives the L-shaped side plate 52 directly connected thereto and the interval adjacent L-shaped side plate 52, so that the two groups of half rectangular punches 51 symmetrically attach to the semicircular punch 41, the upper and lower side walls of each avoiding cavity 42 are fixedly connected with slide bars 421, the upper and lower ends of each side avoiding plate 43 are correspondingly provided with slide grooves one 431, the slide bar 421 and the slide groove one 431 are slidably connected, the slide connection structure limits the movement direction of the side avoiding plate 43, ensures that it is stably telescopic under the action of the spring 44, and provides a guide when the side slide module 5 switches the form, so as to prevent the side avoiding plate 43 from deviating and affecting the molding precision, the upper and lower sides of the L-shaped side plate 52 are correspondingly provided with slide grooves two 56, the slide groove two 56 is slidably connected with the slide bar 421 of the side wall of the avoiding cavity 42,The sliding fit structure provides guidance and limiting for the L-shaped side plate 52 embedded in the avoidance cavity 42 in the composite forming mode, ensures the position stability of the half-round convex mold 51 during the fitting process of the half-round convex mold 41, avoids the forming surface splicing error caused by lateral displacement, and the driver two 54 and the driver one 45 are both air cylinders, the driver two 54 and the driver one 45 are uniformly controlled by an external controller, the external controller is pre-set with a switching program of the basic injection molding mode and the composite forming mode, the controller adjusts the extension stroke, the air pressure and the action timing of the air cylinder in real time according to the production demand of the seat armrest, the half-round convex mold 41 and the half-round convex mold 51 are both provided with an anti-overflow extension part along the injection molding cavity direction, the anti-overflow extension part is a protruding structure extending outward from the rear end of the half-round convex mold 41 and the rear end of the half-round convex mold 51, and the radial dimension is greater than the installation gap of the variable forming assembly in the movable mold 3; during the injection molding process, the anti-overflow extension part tightly contacts the cavity inner wall of the movable mold 3 to form a sealing surface, blocks the molten plastic raw material from penetrating into the variable forming assembly movement space in the movable mold 3, and the surfaces of the movable mold 3 and the static concave mold 2 are both embedded with a nano-level external pressure sensor array, the external sensor array is signal-connected with the external controller, during the injection pressure maintaining stage, the controller adjusts the slight displacement of the driver one 45 and the driver two 54 in real time according to the cavity internal pressure distribution data fed back by the sensor, compensates the forming surface deformation caused by the raw material shrinkage, ensures the forming precision of the special seat armrest product, the displacement compensation amount of the driver one 45 and the driver two 54 is limited to ±0.1mm (single adjustment ≤0.02mm), and the compensation action frequency is ≤5 times / s, which avoids the damage to the forming assembly caused by frequent and large adjustment, and ensures the stability of the injection molding cycle (single cycle compensation time ≤0.5s), the surface roughness Ra of the anti-overflow extension part is ≤0.6μm, and the cooperation gap between the anti-overflow extension part and the movable mold 3 cavity inner wall is ≤0.05mm; the high-precision cooperation not only blocks the raw material penetration, but also provides a stable "force transmission boundary" for pressure compensation - when the driver one 45 and the driver two 54 are finely adjusted, the anti-overflow extension part can ensure that the cavity internal pressure change accurately acts on the forming surface, avoids the compensation failure caused by pressure leakage, and cooperates with the nano-level pressure sensor array to ensure the forming precision of the special product.

[0044] Specifically, as shown in Figure 1 , the injection molding machine 1 drives the movable mold 3 to precisely close the static concave mold 2 along the mold closing direction to form a complete injection molding cavity, the injection system injects molten plastic raw material into the cavity, and after pressure maintaining, cooling and solidification, the seat armrest is formed.

[0045] As shown in Figure 2 and Figure 4As shown, when producing a handrail that fits a circular frame, the side sliding module 5 in the movable core 3 is in the initial position, the semicircular core 41 of the base module 4 is directly exposed in the injection cavity, the side stop plate 43 in the four avoiding cavities 42 blocks the opening under the action of the spring 44 and is flush with the outer surface of the semicircular core 41, and the molten raw material directly contacts the forming surface of the semicircular core 41 to form a handrail base structure that fits a circular frame after solidification.

[0046] As shown, when producing a handrail that fits a circular frame, the side sliding module 5 in the movable core 3 is in the initial position, the semicircular core 41 of the base module 4 is directly exposed in the injection cavity, the side stop plate 43 in the four avoiding cavities 42 blocks the opening under the action of the spring 44 and is flush with the outer surface of the semicircular core 41, and the molten raw material directly contacts the forming surface of the semicircular core 41 to form a handrail base structure that fits a circular frame after solidification. Figures 2 to 10 As shown, when producing a handrail that fits a circular frame, the side sliding module 5 in the movable core 3 is in the initial position, the semicircular core 41 of the base module 4 is directly exposed in the injection cavity, the side stop plate 43 in the four avoiding cavities 42 blocks the opening under the action of the spring 44 and is flush with the outer surface of the semicircular core 41, and the molten raw material directly contacts the forming surface of the semicircular core 41 to form a handrail base structure that fits a circular frame after solidification.

[0047] Subsequently, the second driver 54 is started, the limiting disc 55 on the output shaft thereof is in sliding fit with the inner sliding channel 531 in the L-shaped side plate 52, the L-shaped side plate 52 closest to and spaced from the adjacent L-shaped side plate 52 is driven to move towards the inside of the movable core 3, the arc end of the L-shaped side plate 52 abuts against the surface of the side stop plate 43, the spring 44 is compressed to make the side stop plate 43 retreat into the avoiding cavity 42 through the sliding fit of the sliding groove one 431 and the sliding strip 421, and the sliding groove two 56 on the upper and lower sides of the L-shaped side plate 52 is in fit with the sliding strip 421 to be embedded into the avoiding cavity 42 to complete the space retreat.

[0048] In this process, the L-shaped side plate 52 drives the semicircular core 41 to move synchronously, and the inner arc surface of the semicircular core 41 is completely attached to the outer surface of the semicircular core 41 after the semicircular core 41 moves synchronously with the L-shaped side plate 52, and the three are spliced into the rectangular core form.

[0049] Then, the first driver 45 is started to elongate, the semicircular core 41 is driven to move towards the side of the static core 2, the L-shaped side plate 52 drives the semicircular core 41 to move synchronously due to the sliding groove two 56 being limited by the sliding strip 421, the outer sliding channel 53 on the L-shaped side plate 52 slides on the limiting disc 55 of the second driver 54 to ensure the stability of the movement.

[0050] After the movable core 3 and the static core 2 are combined, the molten raw material is injected into the cavity to form a handrail that fits a square frame after solidification.

[0051] In this process, the anti-overflow extension abuts against the inner wall of the cavity of the movable core 3 to form a sealing surface, blocks the raw material from penetrating into the inside, and the nanoscale pressure sensor array on the surface of the movable core 3 and the static core 2 feeds back the pressure distribution in the cavity in real time, the controller adjusts the slight displacement of the first driver 45 and the second driver 54 according to the data to compensate for the deformation caused by the shrinkage of the raw material, ensures that the size tolerance of the handrail is ≤±0.03 mm, cooperates with the precision guidance of the sliding structure to ensure the splicing precision of the forming surface and the product quality, realizes the efficient customized production of different frame handrails in the same batch, and achieves the same effect.

[0052] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and implementations, it is to be understood that the terminology used is for the purpose of descriptive clarity and that it should be taken in a descriptive sense and not a limiting sense.

[0053] While the embodiments of the application have been shown and described herein, it is to be understood that the application is not limited to these embodiments. Rather, many modifications, changes, substitutions, and alterations can be made to the embodiments of the application without departing from the spirit and scope of the application as defined by the appended claims and their equivalents.

Claims

1. A seat armrest injection molding equipment for producing customized seat armrest special products adapted to a multi-element frame, comprising an injection molding machine (1), a static female mold (2) and a dynamic male mold (3) are respectively installed on the surface of the injection molding machine (1), the injection molding machine (1) drives the dynamic male mold (3) to precisely close with the static female mold (2) in the direction of closing mold, to form a complete injection molding cavity, and to inject a molten plastic raw material into the cavity through an injection system, and to realize the molding of the seat armrest after pressure maintaining and cooling and solidification, characterized in that: The movable punch (3) is integrated with a variable forming assembly, which comprises symmetrically arranged base modules (4) and adaptive side slide modules (5), each base module (4) corresponds to a group of side slide modules (5), and the side slide modules (5) can be wrapped around the base modules (4) by sliding, so that the movable punch (3) has two customized forming shapes. One is a basic injection molding shape, at this time the side slide modules (5) are in the initial position, and the base modules (4) are directly exposed in the injection molding cavity, and the molten plastic material directly contacts the forming surface of the base modules (4), and after solidification, the base structure of the seat armrest adapted to the standard frame is formed. The other is a composite forming shape, the side slide modules (5) slide centripetally and completely wrap the base modules (4), forming a combined forming surface geometrically complementary to the base modules (4), which has a non-standard contour adapted to different frames, and after the molten plastic material fills the combined forming surface, a special seat armrest product adapted to different seat frames is formed.

2. The injection molding apparatus for a seat armrest according to claim 1, characterized by: The base module (4) includes a semicircular punch (41) and a driver I (45), the driver I (45) is fixedly connected inside the movable punch (3), the semicircular punch (41) is fixedly connected with the output shaft of the driver I (45), the side slide module (5) includes two half-matrix punches (51) and a driver II (54), the driver II (54) is fixedly connected inside the movable punch (3), and the telescopic movement of the driver II (54) can drive the half-matrix punches (51) to slide radially, so that the two half-matrix punches (51) are attached to the curved surface of the semicircular punch (41), realizing the switching of the movable punch (3) from the basic shape to the composite shape.

3. A seat arm injection molding apparatus according to claim 2, characterized in that: The semicircular punch (41) is in a semicircular structure, used for forming a seat armrest adapted to a circular frame, the inner arc surface of the half-matrix punch (51) is complementary to the outer surface shape of the semicircular punch (41), and the outer side surface is a plane structure, when the two half-matrix punches (51) are attached to the surface of the semicircular punch (41), the three are spliced to form a rectangular punch shape, used for forming a seat armrest adapted to a square frame.

4. The seat arm injection molding apparatus of claim 2, wherein: The base module (4) further comprises four avoidance cavities (42), each two avoidance cavities (42) are symmetrically arranged on the side of the semicircular punch (41) away from the static recess (2), each avoidance cavity (42) is movably connected with a side avoiding plate (43), and the side avoiding plate (43) is fixedly connected with a spring (44) between the inner wall of the avoidance cavity (42), in the basic injection molding shape, the side avoiding plate (43) completely blocks the opening of the avoidance cavity (42) under the elastic force of the spring (44), and is flush and attached to the outer surface of the semicircular punch (41), ensuring that the molten plastic material uniformly fills the cavity.

5. A seat arm injection molding apparatus according to claim 4, characterized in that: The side sliding module (5) further comprises an L-shaped side plate (52) corresponding to each half-rectangular punch (51), which is fixedly connected to the inner side of the half-rectangular punch (51), and an outer sliding channel (53) is formed in the L-shaped side plate (52), and the output shaft of the second driver (54) is slidingly connected in the outer sliding channel (53), when the second driver (54) is elongated, the output shaft drives the L-shaped side plate (52) to drive the half-rectangular punch (51) to slide towards the center through the outer sliding channel (53), the arc end of the L-shaped side plate (52) abuts against the side spacer plate (43) and compresses the spring (44), so that the side spacer plate (43) is retracted into the avoiding cavity (42), at the same time, the half-rectangular punch (51) is attached to the surface of the half-circular punch (41), and the L-shaped side plate (52) is embedded in the avoiding cavity (42) to complete the space displacement.

6. A seat arm injection molding apparatus according to claim 5, characterized in that: The output shaft of the second driver (54) is fixedly connected with two limiting discs (55), and the inner sliding channel (531) corresponding to the limiting disc (55) is formed in the outer sliding channel (53), each second driver (54) is slidingly matched with the inner sliding channel (531) through the limiting disc (55), and two L-shaped side plates (52) are driven to move synchronously, that is, each second driver (54) drives the L-shaped side plate (52) directly connected thereto and the L-shaped side plate (52) adjacent thereto, so that the two groups of half-rectangular punches (51) are symmetrically attached to the half-circular punch (41).

7. The injection molding apparatus for a seat armrest of claim 4, wherein: The upper and lower sidewalls of each avoiding cavity (42) are fixedly connected with a sliding bar (421), and the upper and lower ends of each side spacer plate (43) are correspondingly provided with a sliding groove (431), and the sliding bar (421) is slidingly matched with the sliding groove (431), the sliding matching structure limits the movement direction of the side spacer plate (43), ensures the stable expansion and contraction of the side spacer plate (43) under the action of the spring (44), and provides guidance when the side sliding module (5) switches the mode, so as to prevent the side spacer plate (43) from deviating and affecting the forming precision.

8. The seat arm injection molding apparatus of claim 5, wherein: Corresponding sliding grooves (56) are formed in the upper and lower sides of the L-shaped side plate (52), and the sliding grooves (56) are slidingly matched with the sliding bars (421) on the sidewalls of the avoiding cavity (42), the sliding matching structure provides guidance and limiting for the L-shaped side plate (52) embedded in the avoiding cavity (42) in the composite forming mode, and ensures that the half-rectangular punch (51) remains stable during the attachment to the half-circular punch (41), so as to avoid the splicing error of the formed surface caused by lateral displacement.

9. The seat arm injection molding apparatus of claim 2, wherein: The second driver (54) and the first driver (45) are both air cylinders, the second driver (54) and the first driver (45) are uniformly controlled by an external controller, the external controller is pre-set with a switching program of the basic injection molding mode and the composite forming mode, and the controller adjusts the expansion and contraction stroke, air pressure and action timing of the air cylinder in real time according to the production requirements of the seat armrest.

10. The seat arm injection molding apparatus of claim 1, wherein: The semi-circular punch (41) and the semi-rectangular punch (51) are provided with anti-overflow extensions along the injection cavity direction, which are protruding structures extending outward from the rear ends of the semi-circular punch (41) and the semi-rectangular punch (51) and have a radial dimension greater than the installation gap of the variable forming assembly inside the movable punch (3); during the injection process, the anti-overflow extensions tightly abut the cavity inner wall of the movable punch (3) to form a sealing surface, thereby blocking the molten plastic material from penetrating into the variable forming assembly movement space inside the movable punch (3).

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