WO2021139385A1

WO2021139385A1 - Compression molding device for molded product, and molding method therefor

Info

Publication number: WO2021139385A1
Application number: PCT/CN2020/127691
Authority: WO
Inventors: 赵伟
Original assignee: 广西福斯派环保科技有限公司
Priority date: 2020-01-09
Filing date: 2020-11-10
Publication date: 2021-07-15
Also published as: CN111206459A; CN111206459B

Abstract

A compression molding device for a molded product, and a molding method therefor. The device comprises an upper die comprising an upper die base (100) and an upper die cover plate (110); and a lower die base (120). The upper die further comprises a pressing structure used for connecting the upper die base (100) and the upper die cover plate (110) and capable of moving relative to an axial direction of the lower die base (120) when being pressed, and when the upper die is moved to enable the upper die cover plate (110) to come into contact with the lower die base (120), the pressing structure and the lower die base (120) have a pair of spaced surfaces which are opposite each other and can form close contact by means of relative movement, one of the opposite spaced surfaces is provided with a pressing groove (121) recessed in the axial direction of the lower die base (120), a protrusion protruding in the axial direction of the lower die base (120) is formed on another surface of the opposite spaced surfaces; when a sufficient axial pressure is applied to the upper die base (100), the pressing structure is pressed to move close to the axial direction of the lower die base (120), and the lower die base (120) is in close contact with the opposite spaced surface on the pressing structure, thus the protrusion is tightly pressed into the groove (121), so that a complete circle of inverted recess is formed on a side wall of a molded product.

Description

Molded product compression molding device and molding method thereof

Technical field

The invention relates to the technical field of molding processing, in particular to a molding product compression molding device and a molding method thereof.

Background technique

Pulp molded products are made of pulp as raw material, using forming molds to absorb pulp and compression molding. The finished products can be recycled and remanufactured. Therefore, they are in line with the trend of energy saving and carbon reduction for environmentally friendly reuse. Therefore, paper and plastic products are quickly received by the industrial and commercial industry and the general public. The public values and are willing to accept and adopt. Pulp molded products are widely used in various fields of life. Among them, being made into beverage cup lids, coffee cup lids and other cup lid products is a relatively common application. At present, the commonly known pulp molding automatic machines for the production of paper and plastic products generally consist of a headbox, a moving device, a receiving frame, a hot press upper mold device with vacuum adsorption, a forming mold upper mold device and a frame. However, as a cup lid type product, it is necessary to press an inverted groove that can be buckled on the cup on the side wall, and the current existing equipment or method can only be pressed on the side wall of the cup lid. For several sections of the groove, or although the lower mold is overwhelming, the side wall corresponding to the upper mold is smooth, and there is only a layer of shallow grooves on the side wall of the cup lid, which cannot achieve the purpose of fastening the cup.

Summary of the invention

The purpose of the present invention is to provide a molded product press forming device, which can press pulp into the required cup lid, and form a complete inverted groove on the side wall of the cup lid to achieve fastening The purpose of the cup.

The solution adopted by the present invention to solve the above technical problems is:

A compression molding device for molded products, including:

The upper mold includes an upper mold base located on the side of the atmospheric area and an upper mold cover plate arranged on the side of the upper mold base away from the atmospheric area and with a distance from the upper mold base;

The lower mold includes a lower mold base set on a side of the upper mold cover facing away from the upper mold base;

The upper mold also includes a pressing structure that is used to connect the upper mold base and the upper mold cover and can move relative to the axis of the lower mold base when pressed, and move the upper mold so that the When the upper mold cover plate is in contact with the lower mold base, the pressing structure and the lower mold base have a pair of spaced surfaces that are opposed to each other and can form close contact with each other through relative movement, and the opposed spaced surfaces One is provided with a pressure groove recessed in the axial direction of the lower mold base, and the other surface of the opposing spacer surface is formed with a protrusion protruding in the axial direction of the lower mold base. The mold base applies sufficient axial pressure, the upper mold base presses the upper mold cover plate on the lower mold base through the pressing structure, and the pressing structure is pressed to be close to the lower mold With the movement of the base axis in the direction of the axis, the lower mold base is in close contact with the opposing spacing surface on the pressing structure, so that the protrusion is pressed in the pressing groove.

As a preferred technical solution of the present invention, the pressing structure includes an oblique guide column connected with the upper mold base, an upper mold movable core slidably connected with the oblique guide pillar, and a movable core limited in the upper mold An upper mold slider that is between the upper mold cover and the upper mold cover and can move toward the axis of the lower mold base when pushed, and when pressed, the inclined guide post is pressed against the upper mold slider , And in the initial state, there is a distance between the side of the upper mold base facing the lower mold base and the side of the upper mold movable core that faces away from the lower mold base;

The pair of spaced surfaces facing each other are the outer circumferential surface of the lower mold base and the inner circumferential surface of the upper mold slider opposite to the outer circumferential surface of the lower mold base. The pressure groove is provided on the outer circumferential surface, and the protrusion is provided on the inner side wall of the upper mold slider;

When sufficient axial pressure is applied to the upper mold base, the upper mold base drives the inclined guide column to slide on the upper mold movable core in the direction of the upper mold cover plate, and the inclined guide column During the sliding process, the upper mold slider is pushed to move in the axial direction of the lower mold base so that the inner peripheral surface of the upper mold slider is pressed against the outer peripheral surface of the lower mold base, thereby making the convex It is pressed tightly in the pressure groove.

Further, the oblique guide column includes a sliding joint portion inclined toward the axial direction of the upper mold movable core, and a fixed block connected with the sliding joint and fixedly connected with the upper mold base. The side wall is provided with a slot for accommodating the oblique guide post, the slot is provided with an inserting groove that matches the shape of the sliding connecting portion, and the sliding connecting portion is slidably connected in the inserting groove.

Further, a positioning groove for accommodating the inclined guide post is provided on the upper mold slider, and the positioning groove is provided with a sliding groove adapted to the sliding part. In the initial state, the The sliding part on the inclined guide post slides into the insertion groove on the upper mold movable core, and it protrudes from the insertion groove and slidably connects to the sliding groove of the upper mold slider, and this At this time, the inclined guide post does not contact the upper mold cover.

Further, the side surface of the sliding part facing away from the fixed block is a first inclined surface that is inclined toward the axis of the moving core of the upper mold, and the side wall of the sliding groove facing the first inclined surface is and When the first inclined surface matches the second inclined surface, when pressed, the first inclined surface of the inclined guide post is in abutting connection with the second inclined surface on the upper die slider.

Further, the side surface of the sliding part facing away from the fixed block is a first inclined surface that is inclined toward the axis of the moving core of the upper mold, and the side wall of the sliding groove facing the first inclined surface is and When the arc surface of the first inclined surface matches with the shape, when pressed, the first inclined surface of the inclined guide column and the second inclined surface on the upper mold slider are in abutting connection.

Further, the upper mold cover plate is provided with a plurality of the upper mold sliders that are independent of each other, and the plurality of upper mold sliders are pushed to move in the direction of the upper mold movable core axis, and the plurality of upper molds The inner side walls of the sliders are sequentially connected to form an inner circumferential surface that is shape-matched with the circumferential wall of the pressure groove on the lower mold base. Correspondingly, the upper mold base is fixed with a plurality of the upper mold sliders one by one. Corresponding multiple oblique guide posts.

Further, the upper mold base and the upper mold movable core are connected by an elastic member, the elastic member is deformed when pressed, the upper mold movable core is provided with a groove, and one end of the elastic member is connected to The upper mold base is connected, the other end of the elastic member is set in the groove, and sufficient axial pressure is applied to the upper mold base, and the elastic member is compressed and received in the groove so as The upper mold base is pressed against the upper mold movable core.

Further, a card slot is provided on the upper die slide block, a card block is provided on the upper die cover plate to be clamped in the card slot, and the card block is fixed with the upper die moving towards Su Songhu. Correspondingly, the upper mold movable core is provided with a fixing hole that covers the tightening bolt, and the fixing hole is also provided with a longitudinal guide post, the longitudinal guide post One end of the fixing hole extends from the top end of the fixing hole to be screwed with the fastening bolt.

Further, the longitudinal guide column includes a longitudinal column arranged in the fixing hole and threadedly connected with the fastening bolt, and a transverse column connected perpendicularly to the longitudinal column and located outside the fixing hole , The upper mold base is also provided with a receiving groove for accommodating the horizontal column, and the depth of the receiving groove is equivalent to the thickness of the horizontal column.

As another preferred technical solution of the present invention, the pressing structure is a squeeze pad made of elastic material, the squeeze pad is deformed when it is pressed, and the pair of opposing spacing surfaces are The outer circumferential surface of the lower mold base and the inner circumferential surface of the pressing pad opposite to the outer circumferential surface of the lower mold base, and the outer circumferential surface of the lower mold base has the pressure groove;

When sufficient axial pressure is applied to the upper mold base, the upper mold base presses the upper mold cover plate on the lower mold base through the pressing pad. In this process, the extrusion The pressure pad undergoes radial deformation when it is pressed to form the protrusion that fits with the pressure groove, and the protrusion is compressed in the pressure groove.

Further, the upper mold cover includes a boss extending toward the upper mold base and a radial extension connected with the boss and extending toward the axis of the lower mold base, and the upper mold base faces The side surface of the upper mold cover plate has an axial protrusion protruding toward the radial extension portion and a step surface connected with the axial protrusion to form a step structure, and the protrusion and the step The surfaces are arranged oppositely, the radial extension portion and the axial protrusion portion are connected by the squeeze pad, and in the initial state, the boss faces between the end surface of the upper mold base and the step surface There is an axial distance between them.

Further, the lower mold further includes a lower mold movable core movably arranged on the lower mold base and connected to the surface of the lower mold base in a consistent manner, and the lower mold movable core can be moved away when subjected to force. Movement of the lower mold base.

Further, the lower mold base is provided with a first limiting groove extending in the axial direction and a second limiting groove connected to the end side of the first limiting groove away from the upper mold, the second limiting groove The radial dimension of the limiting groove is greater than the radial dimension of the first limiting groove, and one end of the movable core of the lower upper mold extends through the first limiting groove into the second limiting groove and passes through the movable core The bottom plate is constrained in the second confinement slot, and the movable core bottom plate is constrained in the second confinement slot and can be moved closer to or away from the first confinement slot in the second confinement slot. For the linear movement of the positioning groove, the bottom surface of the second limiting groove is also provided with an air hole communicating with it.

Further, a positioning pin is further provided on the bottom surface of the second limiting groove, a through hole corresponding to the positioning pin is provided on the movable core bottom plate, and the movable core of the lower mold is provided with a through hole corresponding to the positioning pin. A guide groove corresponding to the pin, and the guide column passes through the through hole and the guide groove to be connected to the movable core bottom plate and the lower mold movable core.

Further, the lower mold further includes a lower mold base plate connected to the side of the lower mold base facing away from the upper mold, and an air groove connected with the air hole is provided on the lower mold base plate.

Further, the lower mold base is further provided with an exhaust groove communicating with the second groove, and the exhaust groove is sealed by a sealing plug when it is not exhausted.

Another object of the present invention is to provide a molding method of the above-mentioned molded product compression molding device, which includes the following steps:

S1: heating the upper mold and the lower mold to the temperature required by the molding process, placing the wet embryo on the lower mold, and pushing the upper mold to move toward the lower mold;

S2: After the upper mold cover is in contact with the lower mold base, continue to push the upper mold base to move toward the lower mold, the upper mold base compresses the pressing structure, and the pressing structure After being compressed, it moves toward the axis of the lower mold base to squeeze the wet embryo between the lower mold base and the pressing structure, so that the protrusions and pressing grooves on the opposed spacing surfaces are pressed tightly On the wet embryo, an inverted groove is further formed on the wet embryo to complete the pressing of the inverted groove on the molded product.

Further, after the compression of the molded product is completed, air is ventilated into the lower mold base, the airflow separates the molded product from the lower mold base, the ventilation is stopped, the molded product is reset under gravity, and the compression of the molded product is completed process.

Compared with the prior art, the present invention has at least the following beneficial effects: the present invention is provided with a ring of pressure grooves in shape matching with the undercut groove on the lower mold base, and a ring of pressure grooves in shape matching with the pressure groove is formed on the pressing structure Protruding, applying sufficient axial pressure to the upper mold base, the upper mold base presses the upper mold cover plate on the lower mold base through the pressing structure, and the pressing structure is pressed to move closer to the axis of the lower mold base. The mold base is in close contact with the opposing spaced surfaces on the pressing structure, so that the protrusions press the wet embryo in the pressing groove, thereby forming a complete inverted groove on the side wall of the formed cup lid. As a result, the cup cover and the cup can be buckled tighter and better, thereby achieving the purpose of preventing leakage.

Description of the drawings

1 is a schematic diagram of the structure of the molding device in the initial state of the embodiment 1 of the present invention;

2 is a schematic structural diagram of the pressing structure of Embodiment 1 of the present invention;

FIG. 3 is a schematic structural diagram of the molding device of the embodiment 1 of the present invention during press molding; FIG.

4 is a schematic diagram of the structure of the molding device in the initial state of Example 2 of the present invention;

Fig. 5 is a schematic diagram of the structure of the molding device in the second embodiment of the present invention during compression molding.

Detailed ways

In order to better understand the present invention, the following examples are further descriptions of the present invention, but the content of the present invention is not limited to the following examples.

It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials, unless otherwise specified, can be obtained from commercial sources; in the description of the present invention, The terms "horizontal", "vertical", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", The orientation or positional relationship indicated by “inner” and “outer” is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have The specific orientation, construction and operation in a specific orientation cannot be understood as a limitation of the present invention.

Example 1

The invention discloses a press forming device for a molded product, as shown in Fig. 1, comprising an upper mold and a lower mold. The upper mold includes an upper mold base 100 arranged on the side of the atmospheric area and connected to the power device, an upper mold cover plate 110 arranged on the side of the upper mold base 100 away from the atmospheric area, and a compression connecting the upper mold base 100 and the upper mold cover plate 110 structure. In this embodiment, the upper mold base 100 includes a square plate body 101 whose top surface is connected to an oil cylinder, and a flange portion 102 connected to the square plate body 101 and extending in the direction of the upper mold cover 110. The flange portion 102 has a center hole. Of course, the upper mold base 100 can also be a plate body of other shapes, and the power device connected to it can also be other power equipment that can provide axial pressure for it. The upper mold cover 110 is a circular plate body, which is connected to the upper mold base 100 through a pressing structure. The lower mold includes a lower mold base 120 located under the upper mold cover 110 and shape-matched with the upper mold cover 110. After the upper mold cover 110 is pressed, it can be in close contact with the lower mold base 120, and the contact surfaces of the two conform to the shape . In order to be able to press the undercut groove on the molded product, a circle of pressing grooves 121 corresponding to the shape of the undercut groove to be formed is provided on the outer circumferential surface of the lower mold base 120, and the pressure groove 121 faces the lower mold base 120 The axis direction is recessed.

As shown in Figure 2, the pressing structure includes an oblique guide post 130 fixedly connected to the upper mold base, an upper mold movable core 140 slidably connected to the oblique guide post 130, and the upper mold movable core 140 and the upper mold cover plate which are constrained. 110 between the upper mold slider 150. Among them, the inclined guide post 130 includes a sliding joint portion 131 inclined in the axial direction of the upper mold base 100 and a fixing block 132 connected with the sliding joint portion 131 and connected with the upper mold base 100 by bolts or other fasteners. The side surface of the sliding part 131 abuts against the inner side wall of the central hole of the flange part 102. The upper mold movable core 140 is a disc-shaped plate body whose axis coincides with the axis of the lower mold base 120. The upper mold movable core 140 is arranged under the upper mold base 100 and has between the top surface and the bottom surface of the upper mold base 100 spacing. The circumferential side wall of the upper mold movable core 140 is provided with a slot 141 for accommodating the inclined guide post 130, and the slot 141 has an inserting slot that matches the shape of the sliding portion 131, and the sliding portion 131 is slidably connected to In the insertion groove, the inclined guide post 130 can slide up and down on the upper mold movable core 140 along the insertion groove. In this embodiment, the circumferential side wall of the upper mold movable core 140 is provided with four slots 141 at equal intervals. Correspondingly, the pressing structure includes four inclined guide posts 130. Of course, the upper mold movable core 140 The number of slots and the number of inclined guide posts 130 can be determined according to actual needs. The four inclined guide posts 130 are respectively accommodated in the four slots 141 on the upper mold movable core 140, and the sliding joint portions 131 on the four inclined guide posts 130 are correspondingly slidably connected to the four slots 141 In the socket. In addition, in this embodiment, four upper mold sliders 150 are also provided between the upper mold movable core 140 and the upper mold cover 110. The four upper mold sliders 150 are independent of each other and mutually in the initial state. not in contact. The inner side walls of the four upper mold sliders 150 close to the axial direction of the upper mold movable core 140 are arc-shaped, and the four upper mold sliders 150 are pushed to the limit position in the axial direction of the movable core 140 at the same time, and the four upper mold sliders The inner side walls of 150 are connected to form a complete circle, and the side walls of the circle conform to the shape of the peripheral wall of the pressure groove 121.

In order to enable the upper die slider 150 to automatically reset with the movement of the inclined guide post 130 after the pressing is completed, a positioning groove for accommodating the inclined guide post 130 is provided on the upper die slider 150, and the positioning groove is provided with a sliding contact In the initial state, the sliding part 131 on the inclined guide post 130 is inserted into the insertion groove on the upper mold movable core 140, and the lower part thereof protrudes from the insertion groove and slides. Connected to the sliding groove of the upper mold slider 150, at this time, there is a distance between the bottom surface of the inclined guide post 130 and the top surface of the upper mold cover 150. In this way, after the pressing is completed, when the upper mold base 100 is driven by the cylinder to move upward, the inclined guide post 130 is also forced to slide upward on the upper mold movable core 140 to drive the upper mold slider 150 slidingly connected to it to reset, so as to perform the downward movement. The suppression of a molded product. In order to facilitate the four inclined guide posts 130 to more effectively push the upper mold slider 150 to slide upward in the axial direction of the movable core 140 when the four inclined guide posts 130 slide on the upper mold movable core 140, the sliding joint 131 of the inclined guide post 130 is far from the fixed block 132 The side surface is a first inclined surface 133 inclined in the axial direction of the movable core 140 of the upper mold. The side wall of the sliding groove of the upper mold slider 150 opposite to the first inclined surface 133 is a second inclined surface 151, and the second inclined surface 151 is in the shape of the first inclined surface 133. It can be matched, or the side wall of the sliding groove opposite to the first inclined surface 133 may be a curved surface. In the initial state, the lower part of the first inclined surface 133 on the inclined guide post 130 is in contact with the upper part of the second inclined surface 151 of the sliding groove. When pressure is applied to the inclined guide post 130, the inclined guide post 130 is on the upper mold movable core 140 Sliding down, due to the slope of the second inclined surface 151, the inclined guide post 130 gradually pushes the upper mold slider 150 that is in contact with it to move upward in the axial direction of the movable core 140 during the downward sliding process. When the four upper mold sliders 150 moves to the extreme position, and the inner circumferential surface formed by the four upper mold sliders 150 is compressed in the pressure groove 121 on the lower mold base 120.

In order to make the structure of the upper mold stronger, the upper mold base 100 and the upper mold movable core 140 and the upper mold movable core 140 and the upper mold cover plate 110 are all connected. Specifically, the upper mold base 100 and the upper mold movable core 140 are connected by an elastic member, and the elastic member may be a spring or a deformable rubber elastic column. A groove 142 corresponding to the elastic member is provided on the top surface of the upper mold movable core 140, one end of the elastic member is provided on the upper mold base 100, and the other end of the elastic member is provided on the bottom surface of the groove 142. In the natural extension state, the elastic member keeps a certain distance between the upper mold base 100 and the upper mold movable core 140.

The connection between the upper mold movable core 140 and the upper mold cover 110 is as follows: the upper mold slider 150 is provided with a card slot, and the upper mold cover 110 is provided with a card block that is clamped in the card slot, and the card block A fastening bolt extending in the direction of the upward mold movable core 140 is fixed on it. Correspondingly, the upper mold movable core 140 is provided with a fixing hole covering the fastening bolt, the fixing hole is also provided with a longitudinal guide post, and the bottom end of the longitudinal guide post extends from the top of the fixing hole to tighten The fixing bolts are connected by threads, and the top end of the longitudinal guide post protrudes out of the moving core of the upper mold. In order to better lock the upper mold movable core 140 on the upper mold cover 110, the longitudinal guide column includes a longitudinal column 143 arranged in a fixing hole and threadedly connected with a fastening bolt, and a longitudinal column 143 perpendicular to the longitudinal column 143. The horizontal column 144 is connected and located outside the fixing hole, so that when the vertical column 143 is tightened with the fastening bolt, the upper mold movable core 140 is fixed between the horizontal column 144 and the upper mold cover 110. In order to prevent the upper mold base 100 from being able to closely adhere to the upper mold movable core 140 due to the presence of the lateral cylinder 144, the upper mold base 100 is also provided on the bottom surface of the upper mold base 100 corresponding to the lateral cylinder 144 A storage groove whose depth is equivalent to the thickness of the lateral column 144. When the upper mold cover 110 contacts the lower mold base 120, and the power device continues to apply axial pressure to the upper mold base 100, the upper mold base 100 moves downwards and compresses the elastic member to gradually shrink to accommodate the upper mold. In the groove of the core 140, at the same time, the horizontal column 144 on the longitudinal guide column 143 is gradually received in the receiving groove of the upper mold base 100 during the downward movement of the upper mold base 100. So far, the upper mold base 100 is pressed against the movable core 140 of the upper mold.

During the compression molding process of the molded product, the wet blank can be placed on the lower mold. In order to facilitate demolding, the lower mold also includes a lower mold movable that is movably arranged on the lower mold base 120 and whose surface is connected to the surface of the lower mold base 120.芯160。 Core 160. The shape of the surface where the lower mold movable core 160 is connected to the lower mold base 120 corresponds to the shape of the molded product to be press-formed. A first limiting slot 122 and a second limiting slot 123 connected to the lower end of the first limiting slot 122 are provided at the center of the lower mold base 120. The radial dimension of the second limiting slot 123 is larger than that of the first limiting slot. The radial dimension of 122. The lower end of the upper mold movable core 140 penetrates the first limiting slot 122 and extends into the second limiting slot 123 and is limited in the second limiting slot 123 by the movable core bottom plate 170, and the movable core bottom plate 170 is limited. In the second limiting groove 123 and it can make a linear movement close to or away from the first limiting groove 122 in the second limiting groove 123 so as to drive the lower mold movable core 160 to move up and down on the lower mold base 120. In order to make the moving core 160 of the lower mold move smoother up and down, a positioning pin 124 is provided on the bottom surface of the second limiting groove 123, and the moving core bottom plate 170 is provided with a through hole corresponding to the positioning pin 124 and the lower mold The movable core 140 is provided with a guide groove corresponding to the positioning pin 124, and the positioning pin 124 passes through the through hole and the guide groove to be connected to the movable core bottom plate 170 and the lower mold movable core 160.

In order to facilitate the demolding of the molded product to provide power, the bottom surface of the second limiting groove 123 is also provided with an air hole communicating with the second limiting groove 123. By injecting gas into the air hole, the gas enters the second limiting groove 123 to start up. The core bottom plate 170 and the lower mold movable core 140 move upward. The lower mold also includes a lower mold base plate 180 connected to the bottom surface of the lower mold base 120. The lower mold base plate 180 is provided with an air groove 181 connected to the air hole. The air groove 181 is connected to an air pump through a pipe to facilitate air intake. In addition, the lower mold base 120 is also provided with an exhaust groove communicating with the second limiting groove 123. The exhaust groove is sealed by a sealing plug 125 when it is not exhausted. When deflation is required, the sealing plug 125 can be opened. Deflation.

When the molded product compression molding device of this embodiment is used to compress a molded product, as shown in Fig. 3, after both the upper mold and the lower mold are heated to the temperature required by the pulp molding process, the wet embryo of the pulp molded product is placed on On the surface where the lower mold movable core 160 and the lower mold base 120 are connected, an oil cylinder is activated to push the upper mold downward. During the downward movement of the upper mold, the upper mold cover plate 110 first contacts a part of the wet embryo on the lower mold base 120, and the upper mold movable core 140 and the wet mold on the lower mold movable core 160 are also in contact and connected. Continue to apply axial pressure to the upper mold base 100, the inclined guide post 130 is pressed on the upper mold movable core 140 and slides downward to push the upper mold slider 150 connected to it to move toward the pressure groove 121. At the same time, the upper mold The elastic member on the base 100 is compressed and contracted so that the upper mold base 100 gradually approaches the upper mold movable core 140. When the four upper mold sliders 150 are pushed to the limit position, the inner circumferential surface formed by the four upper mold sliders 150 The wet embryo is pressed into the pressing groove 121 on the lower mold base 120 to form an inverted groove on the peripheral wall of the wet embryo. At this time, the upper mold base 100 also moves downward to be pressed against the upper mold movable core 140, and the upper mold movable core 140 is pressed to press the wet embryo on the lower mold movable core 140 and the lower mold base 120 to compress the wet embryo. Forming, so far, the wet embryo of the pulp is pressed.

After the pulp molded product is compressed, the oil cylinder drives the upper mold base 100 to move upward, and the elastic member gradually resets to the initial position under its own elastic force. During the resetting process of the elastic member, the upper mold movable core 140 moves downward to make the tilt The guide post 130 makes an upward relative movement to drive the upper die slider 150 slidably connected to it to return to the initial position. When the upper mold moves to the set position, blow air to the air groove, the air enters the second limiting groove 123 through the air groove 181 and the air hole, and the moving core bottom plate 170 located in the second limiting groove 123 is pushed up by the air flow Thereby driving the lower mold movable core 160 to move upwards in the vertical direction, the pulp molded product is separated from the lower mold base, the gas in the second limiting groove 123 is released through the exhaust groove, and the lower mold movable core 160 is reset. The process of compression molding of molded products.

Example 2:

The difference from Embodiment 1 is that, as shown in Figs. 4 and 5, the pressing structure is a pressing pad 230 made of an elastic material, and the pressing pad 230 can be deformed when pressed; and in this embodiment, The upper mold cover 210 includes a boss 211 extending in the direction of the upper mold base 200 and an annular radial extension 212 connected to the boss 211 and extending in the axial direction of the lower mold base 220. When the upper mold is pushed to connect with the lower mold, the radial extension 212 and the lower mold base 220 are in close contact and the contact surfaces of the two conform to the shape. The bottom surface of the upper mold base 200 has an axial protrusion 201 protruding toward the radial extension 212 and a step surface 202 connected with the axial protrusion 201 to form a stepped structure, and a boss 211 on the upper mold cover 210 It is arranged opposite to the step surface 202 on the upper mold base 200. The bottom surface of the upper mold base 200 also has a pressing surface that coincides with the surface of the lower mold movable core 260. The pressing pad 230 has a circular ring shape, and its inner diameter and outer diameter are equivalent to the inner diameter and outer diameter of the radial extension 212. The pressing pad 230 is disposed between the radial extension 212 and the axial protrusion 201 for connecting the radial extension 212 and the axial protrusion 201. When the upper mold cover 210 is in contact with the lower mold base 220, the upper mold base 200 and the upper mold movable core 240 are in a consistent connection, and the pressure groove 221 on the outer circumferential surface of the lower mold base 220 and the inner circumferential surface of the pressing pad 230 are mutually connected. Opposite settings. In the initial state, there is an axial distance between the top surface of the boss 211 and the step surface 202. When sufficient axial pressure is applied to the upper mold base 200, the step surface 202 on the upper mold base 200 gradually approaches the boss 211. In this process, the axial protrusion 201 on the upper mold base 200 gradually compresses the pressing pad 230. The squeeze pad 230 undergoes radial deformation when it is pressed to form a protrusion adapted to the pressure groove 221. When the step surface 202 on the upper die base 200 is pressed against the boss 211, the protrusion is pressed tightly. In the pressure groove 221.

When using the molded product compression molding device of this embodiment, the upper mold and the lower mold are heated to the temperature required by the pulp molding process, and the wet embryo of the molded product is placed on the lower mold, and the oil cylinder drives the upper mold base downward movement. During the downward movement of the upper mold, the upper mold cover 210 first contacts the lower mold base 220, and continues to push the upper mold base 200 downward. The upper mold base 200 gradually compresses the wet embryo on the lower mold movable core 260 and the lower mold base 220. On the mold base 220, the molded product to be molded is pressed on the wet embryo. At the same time, the step surface 202 on the upper mold base 200 gradually approaches the boss 211, so that the axial protrusion 201 on the upper mold base 200 continuously presses the pressing pad 230, and the pressing pad 230 generates The radial deformation forms a protrusion that fits with the pressing groove 221. When the step surface 202 on the upper mold base 200 is pressed against the boss 211, the protrusion presses the wet embryo on the lower mold base 220 against it. In the pressing groove 221, an undercut groove is formed on the side wall of the molded product.

After the pulp molded product is compressed, the oil cylinder drives the upper mold base 200 to move upward, and the squeeze pad 230 gradually returns to the initial position. When the upper mold moves to the set position, blow air to the air groove, and the air enters the second limiting groove (not shown in the figure) through the air groove and the air hole, and the movable core of the lower mold is located in the second limiting groove Propelled by the airflow, the lower mold movable core 260 is driven to move upward in the vertical direction, the pulp molded product is separated from the lower mold base 220, the gas in the second limit groove is released through the exhaust groove, and the lower mold movable core The 260 is reset, and the process of pressing the molded product has been realized so far.

The above are only the preferred embodiments of the present invention. Of course, the scope of rights of the present invention cannot be limited by this. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, they can also Several improvements and changes have been made, and these improvements and changes shall also be regarded as the protection scope of the present invention.

Claims

A compression molding device for molded products, which is characterized in that it comprises:

The upper mold includes an upper mold base located on the side of the atmospheric area and an upper mold cover plate arranged on the side of the upper mold base away from the atmospheric area and with a distance from the upper mold base;

The lower mold includes a lower mold base on the side of the upper mold cover facing away from the upper mold base;

The upper mold also includes a pressing structure that is used to connect the upper mold base and the upper mold cover and can move relative to the axis of the lower mold base when pressed, and move the upper mold so that the When the upper mold cover plate is in contact with the lower mold base, the pressing structure and the lower mold base have a pair of spaced surfaces that are opposed to each other and can form close contact with each other through relative movement, and the opposed spaced surfaces One is provided with a pressure groove recessed in the axial direction of the lower mold base, and the other surface of the opposing spacer surface is formed with a protrusion protruding in the axial direction of the lower mold base. The mold base applies sufficient axial pressure, the upper mold base presses the upper mold cover plate on the lower mold base through the pressing structure, and the pressing structure is pressed to be close to the lower mold With the movement of the base axis in the direction of the axis, the lower mold base is in close contact with the opposing spacing surface on the pressing structure, so that the protrusion is pressed in the pressing groove.
The molded product press forming device according to claim 1, wherein the pressing structure comprises an oblique guide post connected to the upper mold base, an upper mold movable core slidably connected to the oblique guide post, and a limited An upper mold slider located between the upper mold movable core and the upper mold cover and movable toward the axis of the lower mold base when being pushed, and when pressed, the inclined guide post is pressed against On the upper mold slider, and in an initial state, there is a distance between the side of the upper mold base facing the lower mold base and the side of the upper mold movable core that faces away from the lower mold base;

The pair of spaced surfaces facing each other are the outer circumferential surface of the lower mold base and the inner circumferential surface of the upper mold slider opposite to the outer circumferential surface of the lower mold base. The pressure groove is provided on the outer circumferential surface, and the protrusion is provided on the inner side wall of the upper mold slider;

When sufficient axial pressure is applied to the upper mold base, the upper mold base drives the inclined guide column to slide on the upper mold movable core in the direction of the upper mold cover plate, and the inclined guide column During the sliding process, the upper mold slider is pushed to move in the axial direction of the lower mold base so that the inner peripheral surface of the upper mold slider is pressed against the outer peripheral surface of the lower mold base, thereby making the convex It is pressed tightly in the pressure groove.
5. The molded product press-forming device according to claim 2, wherein the oblique guide post includes a sliding part that is inclined toward the axis of the upper mold movable core, and a sliding part connected to the sliding part and fixed to the upper mold base The connected fixed block is provided with a slot for accommodating the oblique guide post on the circumferential side wall of the upper mold movable core, and the slot has an insertion slot that matches the shape of the sliding part, so The sliding part is slidingly connected in the insertion groove.
The molded product press-forming device according to claim 3, wherein a positioning groove for accommodating the inclined guide post is provided on the upper mold sliding block, and the positioning groove is provided with a positioning groove for accommodating the inclined guide post. The sliding groove adapted to the connecting portion, in the initial state, the sliding connecting portion on the oblique guide post slides in the inserting groove on the upper mold movable core and it protrudes from the inserting groove and slides Is connected to the sliding groove of the upper mold slider, and at this time, the inclined guide post does not contact the upper mold cover plate.
The molded product press-forming device according to claim 4, wherein the side of the sliding part facing away from the fixed block is a first inclined surface that is inclined toward the axis of the moving core of the upper mold. The side wall of the groove facing the first inclined surface is a second inclined surface that matches the shape of the first inclined surface. When pressed, the first inclined surface of the inclined guide post and the upper mold slider The second inclined surface abuts and connects.
The molded product press-forming device according to claim 4, wherein the side of the sliding part facing away from the fixed block is a first inclined surface that is inclined toward the axis of the moving core of the upper mold. The side wall of the groove facing the first inclined surface is an arc surface that matches the shape of the first inclined surface. When pressed, the first inclined surface of the inclined guide post and the upper mold slider The second inclined surface abuts and connects.
The molded product press-forming device according to claim 2, wherein the upper mold cover is provided with a plurality of the upper mold sliders independent of each other, and the plurality of the upper mold sliders are pushed toward each other. The upper mold moving core moves in the axial direction, and the inner side walls of the upper mold sliders are sequentially connected to form an inner circumferential surface that matches the shape of the pressure groove peripheral wall on the lower mold base. Correspondingly, the upper mold A plurality of the inclined guide posts corresponding to a plurality of the upper mold sliding blocks one-to-one is fixed on the base.
The molding device of claim 2, wherein the upper mold base and the upper mold movable core are connected by an elastic member, and the elastic member is deformed when compressed, and the upper mold A groove is provided on the movable core, one end of the elastic member is connected to the upper mold base, and the other end of the elastic member is set in the groove to apply sufficient axial pressure to the upper mold base, The elastic member is compressed and received in the groove so that the upper mold base is pressed against the upper mold movable core.
2. The molding device for molding products according to claim 2, wherein the upper mold slider is provided with a card slot, and the upper mold cover is provided with a card block that is clamped in the card slot , The clamping block is fixed with a fastening bolt extending in the direction of the movable core of the upper mold of Su Songhu, and correspondingly, the movable core of the upper mold is provided with a fixing hole that covers the fastening bolt, and the The fixing hole is also provided with a longitudinal guide post, and one end of the longitudinal guide post extends from the top end of the fixing hole to be connected with the fastening bolt through a screw thread.
9. The molded product press-forming device according to claim 9, wherein the longitudinal guide post comprises a longitudinal post provided in the fixing hole and threadedly connected with the fastening bolt, and a longitudinal post connected to the longitudinal The column is vertically connected to the horizontal column outside the fixing hole. The upper mold base is also provided with a storage groove for accommodating the horizontal column. The depth of the storage groove is the same as that of the horizontal column. The thickness is comparable.
The molding device of claim 1, wherein the pressing structure is a squeeze pad made of elastic material, and the squeeze pad is deformed when pressed, the pair of The spaced surfaces facing each other are the outer circumferential surface of the lower mold base and the inner circumferential surface of the pressing pad opposite to the outer circumferential surface of the lower mold base, and the outer circumferential surface of the lower mold base has all The pressure groove;

When sufficient axial pressure is applied to the upper mold base, the upper mold base presses the upper mold cover plate on the lower mold base through the pressing pad. In this process, the extrusion The pressure pad undergoes radial deformation when it is pressed to form the protrusion that fits with the pressure groove, and the protrusion is compressed in the pressure groove.
The molded product press-forming device according to claim 11, wherein the upper mold cover includes a boss extending toward the upper mold base, and a boss connected to the boss and facing the lower mold base. A radial extension portion extending in the axial direction, the upper mold base has an axial protrusion protruding toward the radial extension on the side surface of the upper mold base facing the upper mold cover plate, and is connected to the axial protrusion A step surface of a stepped structure is formed, the boss and the step surface are arranged oppositely, the radial extension and the axial boss are connected by the squeeze pad, and in the initial state, the boss There is an axial distance between the end surface facing the upper mold base and the step surface.
The molded product press-forming device according to claim 2 or 11, wherein the lower mold further comprises a lower mold movably arranged on the lower mold base and whose surface is connected with the surface of the lower mold base. Mould movable core, said lower mould movable core can move away from said lower mould base when under force.
The molded product press forming device according to claim 13, wherein the lower mold base is provided with a first limiting groove extending in the axial direction, and the first limiting groove is away from the upper mold. The second limit slot connected to the end side of the second limit slot, the radial size of the second limit slot is greater than the radial size of the first limit slot, and one end of the movable core of the lower upper mold passes through the first limit slot Extends into the second limiting groove and is limited in the second limiting groove by the moving core bottom plate, and the moving core bottom plate is limited in the second limiting groove and can be located in the second limiting groove. The second limiting groove makes a linear movement close to or away from the first limiting groove, and the bottom surface of the second limiting groove is also provided with an air hole communicating with the second limiting groove.
The molded product press forming device according to claim 14, wherein a positioning pin is further provided on the bottom surface of the second limiting groove, and a through hole corresponding to the positioning pin is provided on the movable core bottom plate. The movable core of the lower mold is provided with a guide groove corresponding to the positioning pin, and the guide column passes through the through hole and the guide groove to connect with the movable core bottom plate and the movable core of the lower mold .
The molded product press forming device according to claim 13, wherein the lower mold further comprises a lower mold bottom plate connected to the side of the bottom mold base that faces away from the upper mold, and the bottom mold bottom An air groove connected with the air hole is provided.
The molded product compression molding device according to claim 13, wherein the lower mold base is further provided with an exhaust groove communicating with the second groove, and the exhaust groove is not exhausted. It is sealed by a sealing plug.
A molding method of a molded product compression molding device according to any one of claims 1-17, characterized in that it comprises the following steps:

S1: heating the upper mold and the lower mold to the temperature required by the molding process, placing the wet embryo on the lower mold, and pushing the upper mold to move toward the lower mold;

S2: After the upper mold cover is in contact with the lower mold base, continue to push the upper mold base to move toward the lower mold, the upper mold base compresses the pressing structure, and the pressing structure After being compressed, it moves to the axis of the lower mold base to squeeze the wet embryo between the lower mold base and the pressing structure, so that the protrusions and pressing grooves on the opposed spacing surfaces are pressed tightly On the wet embryo, an inverted groove is further formed on the wet embryo to complete the pressing of the inverted groove on the molded product.
The molding method of the molded product press molding device according to claim 18, wherein after the molded product is compressed, air is vented into the lower mold base, and the air flow separates the molded product from the lower mold base , Stop the ventilation, the molded product is reset under gravity, and the compression process of the molded product is completed.