A low-pressure injection molding die for automobile column interior trim panels

Abstract

The present invention discloses a low-pressure injection molding processing mold for an automobile column interior panel, which relates to the field of injection molding technology, and includes an upper mold and a lower mold, both of which have an injection state and a stripping state. The upper mold is rotatably mounted on a base, the lower mold is vertically slidably mounted on the base, and a feed pipe is fixedly connected to the upper mold. A scraper assembly includes two crossbeams fixedly mounted on the base, a slider is slidably mounted on the crossbeam, and a scraper is mounted on the slider. The present invention does not adopt the traditional structure of opening an exhaust hole on the upper mold, but designs the top of the cavity between the upper mold and the lower mold to be open, so that the air in the cavity can be discharged from the opening at a faster speed during the injection molding process; in this way, even if a low injection molding pressure is maintained, the raw material can fully fill the entire cavity and overflow from the opening at the top of the cavity; at the same time, the overflowed raw material is scraped and collected by the scraper assembly, which not only avoids waste, but also ensures that the edge of the interior panel is intact and free of burrs.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, in particular to a low-pressure injection molding mold for an automobile column interior trim panel. Background Art

[0002] Low-pressure injection molding is a process method that uses very low injection pressure to inject raw materials into a mold and quickly solidify and mold. Low-pressure injection molding has low cost and good molding effect. It is widely used in the manufacture of automobile interior panels with relatively complex shapes. For example, the Chinese invention patent application with publication number CN113400591A discloses an A-pillar interior panel injection mold, which includes a mold frame plate of an upper mold plate and a lower mold plate, a fixed mold plate fixed on the upper mold plate and including a fixed mold core and a casting pipe, and an ejector mechanism fixed on the lower mold plate and forming a cavity between the fixed mold plate and the movable mold plate, which is arranged on the movable mold plate and can enter the cavity. The movable mold plate includes a movable mold core and a slider mechanism; the slider mechanism includes a guide rail, a shaping slider, a slider pull plate, and a control cylinder; the guide rail is also provided with an ejector rod inserted on the shaping slider, the shaping slider is provided with a shaping rod for forming a buckle on the overlapped flange, and an elastic ejector is provided between the shaping rod and the shaping slider to eject the top of the shaping rod out of the shaping slider when the shaping slider is separated from the fixed mold core. For another example, a Chinese patent application with publication number CN112793087A discloses an injection mold for a vehicle door interior panel, which includes an injection unit, an upper mold group, a lower mold group, an injection cavity and a gas-assisted unit; the injection cavity is formed by the cooperation of the upper mold group and the lower mold group; the injection unit is arranged in the upper mold group, the injection unit is connected with the upper mold group, and the injection unit is used to inject the injection cavity; the gas-assisted unit is arranged in the lower mold group, and the output end of the gas-assisted unit is connected with the injection cavity.

[0003] In fact, as the requirements for lightweight automobiles become increasingly stringent, the thickness of various interior panels in the car is also limited to a certain range. At present, when processing thinner interior panels, due to the small distance between the upper mold and the lower mold, and the exhaust is only carried out by the exhaust holes opened on the upper mold, the raw material is not easy to fully extend to the edge of the cavity, that is, there will be burrs on the edge of the molded interior panel. In order to solve this problem, the injection molding pressure can only be increased, but because there are holes and grooves on the interior panel that are adapted to body accessories such as seat belts, under greater pressure, the raw material will extend into the gap between the upper mold and the lower mold, resulting in excess flash. Based on this, how to ensure low-pressure injection molding while allowing the raw material to fully fill the edge of the cavity and reduce the presence of burrs is a problem that technicians in this field need to solve. Summary of the invention

[0004] The purpose of the present invention is to provide a low-pressure injection molding die for an automobile column interior trim panel to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above object, the present invention provides the following technical solution: a low-pressure injection molding mold for an automobile column interior panel, comprising an upper mold and a lower mold, wherein both the upper mold and the lower mold have an injection state and a stripping state.

[0006] In the injection state, the end faces of the upper mold and the lower mold fit together, and the top of the cavity formed by the two forms two parallel strip openings.

[0007] The upper die is vertically slidably mounted on the base, the lower die is rotatably mounted on the base, and a material conveying pipe is fixedly connected to the upper die.

[0008] The scraper assembly comprises two cross beams fixedly mounted on a base, a slider is slidably mounted on the cross beams, and a scraper is mounted on the slider.

[0009] As a preferred technical solution of the present invention, a horizontal axis is rotatably installed on the slider, and the scraper is fixedly installed on the horizontal axis; a rotating arm is fixedly installed at one end of the horizontal axis, and a round pin is slidably installed on the rotating arm, and a guide rod for guiding the round pin is installed at the position corresponding to each round pin on the base.

[0010] As a preferred technical solution of the present invention, the guide rod is parallel to the crossbeam, and a horizontal groove and arc grooves located at both ends of the horizontal groove are formed on the guide rod.

[0011] As a preferred technical solution of the present invention, a ball that rolls with the horizontal groove and the arc groove is rotatably mounted on one end of the round pin, and a spring is connected between the round pin and the rotating arm.

[0012] As a preferred technical solution of the present invention, one end of the arc groove is connected to one end of the horizontal groove and a step is formed at the connection, and the other end of the arc groove is also connected to the horizontal groove and a step is formed; the horizontal groove corresponds to the part of the arc groove, and the groove depth gradually decreases from the end to the middle.

[0013] As a preferred technical solution of the present invention, a wing plate is fixedly mounted on the slider, a pull wire is connected between the two wing plates, a reversing wheel for reversing the pull wire is mounted on the base, and the two pull wires together form a rectangle.

[0014] As a preferred technical solution of the present invention, the scraper is rectangular, and a hollow sleeve is movably provided on the scraper, and the inner surface of the sleeve is in contact with the outer surface of the scraper.

[0015] As a preferred technical solution of the present invention, a rigid frame is fixedly installed on the sleeve plate, a first arc block is fixedly installed on the rigid frame, and a second arc block corresponding to the position of the first arc block is fixedly installed on the slider; a metal spring is connected between the rigid frame and the horizontal axis.

[0016] As a preferred technical solution of the present invention, a top block is vertically slidably installed on the lower mold corresponding to each corner of the bottom rectangle of the lower mold, and a top rod extending to the outside of the lower mold is fixedly installed on the top block, and a wedge block is fixedly installed on one end of the top rod.

[0017] As a preferred technical solution of the present invention, a sliding frame is horizontally slidably installed at the position corresponding to each wedge block on the base, one end of the sliding frame is an inclined surface and fits with the inclined surface of the wedge block; an elastic member is connected between the sliding frame and the base; a first magnet block is fixedly installed on the slider, and a second magnet block corresponding to the position of the first magnet block is fixedly installed on the sliding frame.

[0018] In the above technical scheme, the low-pressure injection molding mold for automobile column interior panels provided by the present invention does not adopt the traditional structure of opening exhaust holes on the upper mold, but designs the top of the cavity between the upper mold and the lower mold to be open, so that the air in the cavity can be discharged from the opening at a faster speed during the injection molding process; in this way, even if a low injection molding pressure is maintained, the raw material can fully fill the entire cavity and overflow from the opening at the top of the cavity; at the same time, the present invention also scrapes and collects the overflowed raw material through a scraper assembly, which not only avoids waste, but also ensures that the edge of the interior panel is intact and free of burrs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a first stereoscopic view of a low-pressure injection molding mold for an automobile pillar interior trim panel according to an embodiment of the present invention;

[0021] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0022] Figure 3 A second stereoscopic view of the low-pressure injection molding mold for the interior trim panel of an automobile pillar in an embodiment of the present invention;

[0023] Figure 4 for Figure 3 The enlarged schematic diagram of point B in the middle;

[0024] Figure 5 A third stereoscopic view of the low-pressure injection molding mold for the interior trim panel of an automobile pillar according to an embodiment of the present invention;

[0025] Figure 6 for Figure 5 Enlarged schematic diagram of point C in the middle.

[0026] Description of reference numerals:

[0027] 1. Upper die; 2. Lower die; 201. Ejector block; 202. Ejector rod; 203. Wedge block; 3. Base; 4. Feed pipe; 5. Scraper assembly; 501. Crossbeam; 502. Slider; 503. Scraper; 504. Horizontal axis; 505. Rotating arm; 506. Round pin; 507. Guide rod; 508. Guide groove; 509. Horizontal groove; 510. Arc groove; 511. Wing plate; 512. Pull wire; 513. Reversing wheel; 514. Sleeve plate; 515. Rigid frame; 516. First arc block; 517. Second arc block; 518. Metal spring; 6. Sliding frame. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] Example 1

[0030] like Figure 1 As shown, this embodiment provides a low-pressure injection molding mold for an automobile column interior panel, including an upper mold 1 and a lower mold 2, both of which have an injection state and a stripping state. The lower mold 2 is rotatably mounted on a base 3. Specifically, protruding round shafts are provided at both ends of the lower mold 2, and the round shafts are driven by an external driving member (not shown in the figure), driving the lower mold 2 to reciprocate 180°; the upper mold 1 is vertically slidably mounted on the base 3. Specifically, at least two electric push rods or hydraulic rods are vertically fixedly mounted on the base 3, and the bottom ends of the telescopic sections of the electric push rods or hydraulic rods are fixedly connected to the upper surface of the upper mold 1, thereby driving the upper mold 1 to rise and fall; a flexible feed pipe 4 is fixedly connected to the upper mold 1, and the feed pipe 4 feeds periodically. In the injection state, the opening of the lower mold 2 faces upward, the end faces of the upper mold 1 and the lower mold 2 fit together and the top surfaces of the two are flush, and two parallel strip openings are formed at the top of the cavity formed by the upper mold 1 and the lower mold 2. The raw material in the feed pipe 4 is squeezed into the cavity between the upper mold 1 and the lower mold 2 under external pressure and extends in the cavity to form the shape of the interior trim panel; the amount of raw material extruded each time is constant and exceeds a part of the volume of the interior trim panel, and the excess raw material will overflow from the two strip openings at the top of the cavity. Before demolding, the excess raw material that has not yet solidified is scraped and collected, and recycled for continued use; within one minute, the raw material in the cavity is solidified, the upper mold 1 first moves upward to enter the demolding state, and then the lower mold 2 rotates 180° to enter the demolding state, and the interior trim panel falls from the lower mold 2 to the conveyor belt below to complete demolding.

[0031] like Figure 2 , Figure 3 and Figure 4As shown, the low-pressure injection molding mold for the interior trim of the automobile pillar in this embodiment also includes a scraper assembly 5, which is used to scrape the raw material overflowing from the cavity. The scraper assembly 5 includes two beams 501 fixedly mounted on the base 3, the beams 501 are parallel to the strip opening at the top of the cavity, a slider 502 is horizontally slidably mounted on the beams 501, the slider 502 reciprocates along the beams 501 under the action of external force, and a scraper 503 is mounted on the slider 502; a horizontal shaft 504 is rotatably mounted on the slider 502, and the scraper 503 is fixedly mounted on the horizontal shaft 504; a rotating arm 505 is fixedly mounted on one end of the horizontal shaft 504, a round pin 506 is slidably mounted on the rotating arm 505, and a guide rod 507 for guiding the round pin 506 is installed at the position corresponding to each round pin 506 on the base 3; the guide rod 507 is parallel to the beam 501, and a guide groove 508 cooperating with the round pin 506 is opened on the guide rod 507.

[0032] Specifically, during the injection molding process, the two sliders 502 are located at one end of their respective horizontal strokes, and the two sliders 502 are not at the same end of the crossbeam 501; after the injection molding is completed, the two sliders 502 begin to translate under the action of external force, and the directions of the two translations are opposite. During the translation of the sliders 502, the horizontal shaft 504, the scraper 503, the rotating arm 505 and the round pin 506 are driven to translate synchronously. The bottom end of the scraper 503 does not contact the upper mold 1 and the lower mold 2 at the beginning. When the bottom end of the scraper 503 is in contact with the top surface of the upper mold 1 and the lower mold 2, the scraper 503 begins to scrape the overflowed raw material, and the scraper 503 remains in an inclined state during the scraping process. Specifically, the scraper 503 and the upper The top surface angle of mold 1 and lower mold 2 is 45°, and the angle of 45° is toward the initial direction of scraper 503, so that the scraped raw materials will gather on the upper surface of scraper 503. It should be noted that since the raw materials are not completely solidified, they will stick to each other, thus forming a mass, rather than a strip; when the bottom end of scraper 503 is separated from upper mold 1 and lower mold 2, scraper 503 and horizontal axis 504 rotate 45° synchronously, scraper 503 is in a vertical state, and the raw materials on scraper 503 fall from scraper 503; then, scraper 503 continues to rotate 45° and enters the tilted state again (the tilting direction at this time is opposite to the previous one), preparing for scraping after the next injection molding. It should be noted that during the translation of slider 502, round pin 506 is always located in guide groove 508.

[0033] In this embodiment, the excess waste can be scraped off during the solidification process of the raw materials, and the collected waste is in a clumping shape, which is convenient for collection and recycling. Compared with the common prior art method of removing the waste after the interior panel is solidified, the efficiency is greatly improved and the difficulty of collection and recycling is reduced.

[0034] like Figure 3 and Figure 4As shown, the guide groove 508 includes a horizontal groove 509 and arc grooves 510 located at both ends of the horizontal groove 509; a spring is connected between the round pin 506 and the rotating arm 505, so that one end of the round pin 506 is always in contact with the guide groove 508, and a ball rolling with the guide groove 508 is rotatably installed at one end of the round pin 506 to reduce the friction force on the round pin 506 during movement; one end of the arc groove 510 is connected to one end of the horizontal groove 509 and a step is formed at the connection (the depth of the horizontal groove 509 at this point is greater than the depth of the arc groove 510), and the arc groove 510 is The other end is also connected to the horizontal groove 509 and forms a step (the depth of the arc groove 510 is greater than the depth of the horizontal groove 509); the horizontal groove 509 corresponds to the part of the arc groove 510, and the groove depth gradually decreases from the end to the middle; specifically, when the slider 502 is at one end of its stroke, the round pin 506 is located at one end of the horizontal groove 509, and when the slider 502 starts to translate, the round pin 506 will translate synchronously along the horizontal groove 509 without entering the arc groove 510, that is, the rotating arm 505, the horizontal shaft 504 and the scraper 503 will not rotate, and the scraper 503 always maintains Tilt state; when the scraper 503 finishes scraping, the slider 502 continues to translate, and the round pin 506 reaches the position where the horizontal groove 509 is connected to the arc groove 510. Since there is a step there, the round pin 506 is blocked from entering the horizontal groove 509, and the round pin 506 can only enter the arc groove 510; as 502 continues to translate, the round pin 506 moves along the arc groove 510, and at the same time, the rotating arm 505, the horizontal shaft 504 and the scraper 503 begin to rotate; when the round pin 506 moves to the middle position of the arc groove 510, the scraper 503 is in a vertical state, When the round pin 506 moves to the end of the arc groove 510, the slider 502 reaches the end position of its current stroke, the scraper 503 has just rotated 90° and is in a tilted state, but the tilting direction is opposite to the previous one; when the slider 502 starts to translate in the opposite direction (i.e. the next scraping process), since a step is formed at the connection between the arc groove 510 where it is located and the horizontal groove 509, the round pin 506 will not enter the arc groove 510, and can only translate along the horizontal groove 509 until it moves to the arc groove 510 on the other side and enters the arc groove 510 on the other side.

[0035] A curved material receiving pipe is fixedly installed on the base 3 at a position corresponding to the arc groove 510, and the excess raw materials fall from the scraper 503 in the vertical state into the material receiving pipe, and the material receiving pipe collects the waste materials.

[0036] like Figure 1 and Figure 2As shown, a wing plate 511 is fixedly installed on the slider 502, a pull wire 512 is connected between the two wing plates 511, and a reversing wheel 513 for reversing the pull wire 512 is installed on the base 3, and the two pull wires 512 together form a rectangle; specifically, the slider 502 is translated along the beam 501 under the push of the operator, and the operator only needs to push a single slider 502 to rely on the action of the pull wire 512 to drive the other slider 502 to move synchronously.

[0037] like Figure 4 As shown, the scraper 503 is rectangular, and a hollow sleeve 514 is movably sleeved on the scraper 503. The single-layer thickness of the sleeve 514 does not exceed 0.5 mm, and the inner surface of the sleeve 514 fits the outer surface of the scraper 503. During the scraping of the excess raw materials by the scraper 503, the raw materials are collected on the scraper 503 and the sleeve 514. During the rotation of the scraper 503, the sleeve 514 first moves downward relative to the scraper 503, and then resets relative to the scraper 503. When the scraper 503 is in a vertical state, it is just above the material receiving tube. At this time, the sleeve 514 just scrapes the raw materials collected on the scraper 503, and the raw materials fall into the material receiving tube. In summary, by moving the sleeve 514 relative to the scraper 503, the raw materials collected on the scraper 503 are scraped off, the separation of the raw materials from the scraper 503 is promoted, and the raw materials are guaranteed to fall into the material receiving tube.

[0038] like Figure 4 As shown, a rigid frame 515 is fixedly mounted on the sleeve plate 514, a first arc block 516 is fixedly mounted on the rigid frame 515, and a second arc block 517 corresponding to the position of the first arc block 516 is fixedly mounted on the slider 502; a metal spring 518 is connected between the rigid frame 515 and the horizontal shaft 504; when the scraper 503 is tilted, the support effect of the metal spring 518 makes the rigid frame 515 and the sleeve plate 514 stationary relative to the scraper 503; during the rotation of the scraper 503, the first arc block 516 and the second arc block 517 are fixedly mounted on the slider 502; 7, the second arc block 517 overcomes the force of the metal spring sheet 518 to push the first arc block 516, the rigid frame 515 and the sleeve plate 514 to move relative to the scraper 503; after the first arc block 516 is separated from the second arc block 517, the rebound force of the metal spring sheet 518 causes the first arc block 516, the rigid frame 515 and the sleeve plate 514 to return to their original positions; in this way, the operator only needs to control the translation of a single slider 502 to enable the collected residual materials on the two scrapers 503 to be automatically separated from the scrapers 503 and fall into the corresponding material receiving pipes.

[0039] like Figure 1 and Figure 6As shown, a top block 201 is vertically slidably installed at each corner of the bottom rectangle of the lower mold 2, and a top rod 202 extending to the outside of the lower mold 2 is fixedly installed on the top block 201, and a wedge block 203 is fixedly installed at one end of the top rod 202. During the injection process, the top surface of the top block 201 is flush with the inner surface of the lower mold 2; when the raw material is solidified, the upper mold 1 rises, and the top rod 202 and the top block 201 rise under the action of external force (no more than 1 cm), lifting the interior panel to facilitate demoulding of the interior panel.

[0040] like Figure 1 and Figure 6 As shown, a sliding frame 6 is horizontally slidably installed at the position corresponding to each wedge block 203 on the base 3, and the sliding frame 6 includes an L-shaped horizontal part and a vertical part fixedly connected to one end of the horizontal part. One end of the horizontal part of the sliding frame 6 is an inclined surface and fits the inclined surface of the wedge block 203; an elastic member is connected between the horizontal part of the sliding frame 6 and the base 3; a first magnet block is fixedly installed on the slider 502, and a second magnet block corresponding to the position of the first magnet block is fixedly installed on the vertical part of the sliding frame 6. The first magnet block and the second magnet block will attract each other when they are close to each other. Specifically, when the operator pushes the slider 502 to translate, when the scraper 503 reaches the vertical state from the inclined state, the operator stops pushing the slider 502 and waits for the raw material to solidify. After the solidification is completed and the upper mold 1 rises, the operator continues to push the slider 502 to the end of this stroke. In this process, the first magnet block on the slider 502 attracts the second magnet block and the sliding frame 6 to translate against the elastic member. When the sliding frame 6 translates, it pushes the wedge block 203, so that the top block 201 lifts the interior panel. In summary, the operator only needs to control the translation of a single slider 502, which can not only make the collected residual materials on the two scrapers 503 automatically separate from the scrapers 503 and fall into the corresponding material receiving tube, but also control the two top blocks 201 to lift the interior panel; it should be noted that since the two top blocks 201 that rise at the same time are at two diagonal positions, it can ensure that the interior panel is demoulded vertically upward without being squeezed with the lower mold 2.

[0041] Example 2

[0042] The difference between this embodiment and the previous embodiment is that, in this embodiment, a horizontal first rack is fixedly installed on the slider 502, and a second rack is horizontally fixedly installed on the vertical part of the sliding frame 6; a gear is rotatably installed on the base 3, and the gear is meshed with the second rack; then, when the operator pushes the slider 502 to translate, the first rack will enter a state of meshing with the gear and drive the gear to rotate, and the gear will drive the second rack and the sliding frame 6 to translate to overcome the action of the elastic member, so that the sliding frame 6 pushes the wedge block 203 to translate, thereby also achieving the effect of the top block 201 lifting the interior panel.

[0043] It should be noted that after the top block 201 lifts the interior trim panel, the operator pushes the slider 502 to move in the opposite direction for a certain distance, so that the sliding frame 6 can be horizontally reset under the action of the elastic member to avoid the sliding frame 6 interfering with the subsequent rotation of the lower mold 2.

[0044] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A low-pressure injection molding mold for an automobile column interior trim panel, comprising an upper mold (1) and a lower mold (2), characterized in that: The upper mold (1) and the lower mold (2) both have a material injection state and a material removal state; In the injection state, the end faces of the upper mold (1) and the lower mold (2) fit together, and the top of the cavity formed by the two forms two parallel strip openings; The upper die (1) is vertically slidably mounted on the base (3), the lower die (2) is rotatably mounted on the base (3), and a material delivery pipe (4) is fixedly connected to the upper die (1); The scraper assembly (5) comprises two crossbeams (501) fixedly mounted on the base (3), a slider (502) being slidably mounted on the crossbeams (501), and a scraper (503) being mounted on the slider (502); A horizontal shaft (504) is rotatably mounted on the slider (502), and the scraper (503) is fixedly mounted on the horizontal shaft (504); a rotating arm (505) is fixedly mounted on one end of the horizontal shaft (504), and a round pin (506) is slidably mounted on the rotating arm (505); and a guide rod (507) for guiding the round pin (506) is mounted at a position corresponding to each round pin (506) on the base (3); The scraper (503) is rectangular, and a hollow sleeve (514) is movably sleeved on the scraper (503), and the inner surface of the sleeve (514) is in contact with the outer surface of the scraper (503); a rigid frame (515) is fixedly mounted on the sleeve (514), a first arc block (516) is fixedly mounted on the rigid frame (515), and a second arc block (517) corresponding to the position of the first arc block (516) is fixedly mounted on the slider (502); a metal spring (518) is connected between the rigid frame (515) and the horizontal shaft (504).

2. A low-pressure injection molding mold for automobile pillar interior trim according to claim 1, characterized in that: The guide rod (507) is parallel to the crossbeam (501), and a horizontal groove (509) and arc grooves (510) located at both ends of the horizontal groove (509) are formed on the guide rod (507).

3. A low-pressure injection molding mold for automobile pillar interior trim according to claim 2, characterized in that: A ball that rolls in cooperation with the horizontal groove (509) and the arc groove (510) is rotatably mounted on one end of the round pin (506), and a spring is connected between the round pin (506) and the rotating arm (505).

4. A low-pressure injection molding mold for automobile pillar interior trim according to claim 3, characterized in that: One end of the arc-shaped groove (510) is connected to one end of the horizontal groove (509) and a step is formed at the connection point. The other end of the arc-shaped groove (510) is also connected to the horizontal groove (509) and a step is formed. The horizontal groove (509) corresponds to the part of the arc-shaped groove (510), and the groove depth gradually decreases from the end to the middle.

5. The low-pressure injection molding die for automobile pillar interior trim according to claim 4, characterized in that: A wing plate (511) is fixedly mounted on the slider (502), a pull wire (512) is connected between the two wing plates (511), a reversing wheel (513) for reversing the pull wire (512) is mounted on the base (3), and the two pull wires (512) together form a rectangle.

6. A low-pressure injection molding mold for automobile pillar interior trim according to claim 5, characterized in that: A top block (201) is vertically slidably mounted on the lower mold (2) at a position corresponding to each corner of the bottom rectangle of the lower mold (2), a top rod (202) extending to the outside of the lower mold (2) is fixedly mounted on the top block (201), and a wedge block (203) is fixedly mounted on one end of the top rod (202).

7. A low-pressure injection molding mold for automobile pillar interior trim according to claim 6, characterized in that: A sliding frame (6) is horizontally slidably mounted at a position corresponding to each wedge-shaped block (203) on the base (3); one end of the sliding frame (6) is an inclined surface and fits the inclined surface of the wedge-shaped block (203); an elastic member is connected between the sliding frame (6) and the base (3); a first magnet block is fixedly mounted on the slider (502), and a second magnet block corresponding to the position of the first magnet block is fixedly mounted on the sliding frame (6).

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