A plastic injection mold and an injection molding method for automobile headrest processing

Abstract

The present invention relates to the technical field of injection molding, and specifically to a plastic injection mold and an injection molding method for automobile headrest processing, comprising: a fixed mold base plate and a movable mold base plate, wherein the fixed mold base plate and the movable mold base plate are respectively provided with symmetrically arranged guide holes; a fixed mold core, which is installed on the fixed mold base plate, and a movable mold core is installed on the movable mold base plate, and a positioning component connected to the movable mold core is arranged on the fixed mold core, and mounting holes are respectively opened on the fixed mold core and the movable mold core; a locking mechanism, which is respectively arranged on the fixed mold base plate and the movable mold base plate, and a locking block matched with the mounting hole is connected to the locking mechanism, and a trigger rotating mechanism is arranged on the locking mechanism; a clamping assembly is respectively arranged on the fixed mold core and the movable mold core; a follower ejection mechanism, which is arranged on the fixed mold core and connected to the movable mold core, and the present application can control the locking block to fix the mold core through the locking mechanism and the trigger rotating mechanism, and control the follower ejection mechanism to eject the molded product during the mold closing and mold opening process.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, in particular to a plastic injection mold and an injection molding method for processing an automobile headrest. Background Art

[0002] In the automotive manufacturing industry, the application of foam materials is becoming more and more widespread, and EPP materials are gradually replacing traditional foam materials and becoming the preferred material for car seats and other parts. EPP, or expanded polypropylene, has occupied a place in the manufacture of car seats with its unique properties.

[0003] When producing headrests, they are usually produced by injection molding. The specific principle is: the heated and melted plastic raw materials are pushed by the injection molding machine screw under high pressure into the mold cavity of the plastic mold, and after cooling and solidification, a plastic molded product is obtained.

[0004] When injection molding a product, the mold usually needs to be installed on the injection molding machine. If the mold needs to be repaired, the entire mold needs to be disassembled. However, since the mold is heavy and usually only the mold core is checked during maintenance, this leads to difficulties in disassembly and a complicated maintenance process. Summary of the invention

[0005] The object of the present invention is to provide a plastic injection mold and an injection molding method for automobile headrest processing to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A plastic injection mold, comprising:

[0008] A fixed mold bottom plate and a movable mold bottom plate, wherein the fixed mold bottom plate and the movable mold bottom plate are respectively provided with symmetrically arranged guide holes;

[0009] Also includes:

[0010] A fixed mold core is mounted on the fixed mold bottom plate, a movable mold core is mounted on the movable mold bottom plate, a positioning assembly connected to the movable mold core is arranged on the fixed mold core, and mounting holes are respectively opened on the fixed mold core and the movable mold core;

[0011] A locking mechanism is respectively arranged on the fixed mold bottom plate and the movable mold bottom plate, the locking mechanism is connected to a locking block matched with the mounting hole, and the locking mechanism is provided with a trigger rotation mechanism, the locking mechanism can be actuated when the locking block is inserted into the mounting hole, and drives the trigger rotation mechanism to move, so as to adjust the matching state between the locking block and the mounting hole;

[0012] A clamping assembly is respectively arranged on the fixed mold core and the movable mold core, and the clamping assembly can be activated when the locking block moves, and locks the position of the locking block;

[0013] The follow-up ejection mechanism is arranged on the fixed mold core and connected to the movable mold core, and is used for ejecting the injection molded product from the fixed mold core.

[0014] As a further solution of the present invention: the positioning assembly includes guide columns fixedly mounted on the fixed mold core and symmetrically arranged, and the movable mold core is provided with guide holes that cooperate with the guide columns.

[0015] As a further solution of the present invention: the locking mechanism comprises a rotating rod rotatably mounted on the fixed mold bottom plate and the movable mold bottom plate respectively, the rotating rod is fixedly connected to the locking block, and a straight groove and an annular groove are formed on the rotating rod;

[0016] It also includes a first movable sleeve slidably mounted on the rotating rod, a first limit block slidably connected to the straight groove and the annular groove is fixed on the inner wall of the first movable sleeve, and guide components are arranged on the fixed mold bottom plate and the movable mold bottom plate.

[0017] As a further solution of the present invention: the guide assembly includes guide rods fixedly mounted on the fixed mold bottom plate and the movable mold bottom plate respectively, a first guide sleeve is slidably mounted on the guide rod, and a first movable plate fixedly connected to the first movable sleeve is fixed on the first guide sleeve.

[0018] As a further solution of the present invention: the trigger rotation mechanism includes a second guide sleeve slidably mounted on the guide rod, a second movable plate is fixed on the second guide sleeve, a second spring abutting against the second movable plate is sleeved on the rotating rod, and an elastic component connected to the second movable plate is provided on the rotating rod.

[0019] As a further solution of the present invention: the elastic component includes a spiral groove opened on the rotating rod, a second movable sleeve is slidably installed on the rotating rod, a second limit block slidably connected to the spiral groove is fixed to the inner wall of the second movable sleeve, and a first spring is sleeved on the rotating rod, and two ends of the first spring are respectively abutted against the first movable plate and the second movable plate.

[0020] As a further solution of the present invention: the locking assembly includes support rods fixedly mounted on the side walls of the fixed mold core and the movable mold core respectively, a limit plate is slidably mounted on the support rod, a limit groove cooperating with the locking block is formed on the limit plate, and a third spring is sleeved on the support rod and abutted against the limit plate.

[0021] As a further solution of the present invention: the follower ejection mechanism includes a fixed rod fixedly installed on the fixed mold core and symmetrically arranged, a connecting plate is slidably installed on the fixed rod, a push rod that abuts against the connecting plate is fixed to the side wall of the movable mold core, and a driven component connected to the connecting plate is arranged on the fixed mold core.

[0022] As a further solution of the present invention: the driven assembly includes a movable rod fixedly mounted on the connecting plate and passing through the fixed mold core, a support ring slidingly sealed with the fixed mold core is fixed at the end of the movable rod, and a fourth spring abutting against the connecting plate is sleeved on the movable rod.

[0023] An injection molding method for processing an automobile headrest comprises the following steps:

[0024] Step 1: Place the fixed mold core and the movable mold core on the fixed mold bottom plate and the movable mold bottom plate respectively, and under the action of the fixed mold core and the movable mold core, drive the locking mechanism to move and trigger the rotation mechanism to move, so that the locking block cooperates with the mounting hole to fix the fixed mold core and the movable mold core on the fixed mold bottom plate and the movable mold bottom plate;

[0025] Step 2: At this point, the mold can be installed on the injection molding machine through the guide hole. After the mold is installed, the injection nozzle can be installed on the moving mold core;

[0026] Step 3: The injection molding machine can heat-melt the raw material, and under the action of the injection molding machine, control the movable mold core to move to a position that is closely fitted with the fixed mold core. At this time, the hot-melt raw material can be transported to the cavity formed by the fixed mold core and the movable mold core through the injection nozzle;

[0027] Step 4: After the injection molding is completed, the headrest is completely formed under the action of cooling. Under the action of the injection molding machine, the movable mold core is controlled to move away from the fixed mold core, and the molded product is ejected under the action of the follower ejection mechanism.

[0028] Compared with the prior art, the beneficial effects of the present invention are: the present application can fix the mold core and the base plate in a detachable manner, so as to achieve the purpose of maintenance without disassembling the entire mold, and only the mold core needs to be disassembled; when the mold needs to be installed, the mold core can be controlled to move toward the base plate, and under the action of the locking mechanism, the trigger rotation mechanism is moved; when the mold core is fitted with the base plate, under the action of the trigger rotation mechanism, the mold core is fixed to the base plate through the locking block; during injection molding, the follow-up ejection mechanism can also be controlled to move according to the parting and closing of the mold, so as to automatically eject the headrest after the headrest is formed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a structural schematic diagram of an embodiment of a plastic injection mold.

[0030] Figure 2 This is a structural schematic diagram of another angle in an embodiment of a plastic injection mold.

[0031] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at point A in the middle.

[0032] Figure 4 This is a schematic diagram of the connection relationship between the fixed mold core and the fixed mold base plate in an embodiment of a plastic injection mold.

[0033] Figure 5 This is a schematic diagram of the connection relationship between the movable mold core and the movable mold base plate in an embodiment of a plastic injection mold.

[0034] Figure 6 This is a schematic structural diagram of a locking mechanism, a triggering rotation mechanism, and a locking assembly in an embodiment of a plastic injection mold.

[0035] Figure 7 The present invention is a structural schematic diagram of a partial follow-up ejection mechanism in an embodiment of a plastic injection mold.

[0036] Figure 8 The exploded structure diagram of the locking mechanism and the triggering rotation mechanism in one embodiment of the plastic injection mold is shown.

[0037] Fig. 9 It is a schematic diagram of the exploded structure of part of the locking mechanism and the locking assembly in one embodiment of the plastic injection mold.

[0038] In the figure: 1. fixed mold base plate; 2. guide hole; 3. fixed mold core; 4. guide column; 5. movable mold base plate; 501. guide hole; 6. movable mold core; 7. mounting hole; 8. rotating rod; 801. straight groove; 802. annular groove; 803. spiral groove; 9. locking block; 10. first movable sleeve; 11. first limit block; 12. first movable plate; 13. guide rod; 14. first guide sleeve; 15. first spring; 16. second movable sleeve; 17. second limit block; 18. second movable plate; 19. second guide sleeve; 20. second spring; 21. support rod; 22. limit plate; 2201. limit groove; 23. third spring; 24. fixed rod; 25. connecting plate; 26. movable rod; 27. support ring; 28. fourth spring; 29. ​​push rod. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0041] See also Figure 1-Figure 9 In an embodiment of the present invention, a plastic injection mold comprises:

[0042] A fixed mold bottom plate 1 and a movable mold bottom plate 5, wherein the fixed mold bottom plate 1 and the movable mold bottom plate 5 are respectively provided with symmetrically arranged guide holes 2;

[0043] Also includes:

[0044] See also Figure 1 , Figure 2 , Figure 4 , Figure 5 The fixed mold core 3 is installed on the fixed mold base plate 1, and the movable mold core 6 is installed on the movable mold base plate 5. The fixed mold core 3 is provided with a positioning assembly connected with the movable mold core 6. The fixed mold core 3 and the movable mold core 6 are respectively provided with mounting holes 7. The positioning assembly includes guide columns 4 fixedly installed on the fixed mold core 3 and symmetrically arranged. The movable mold core 6 is provided with guide holes 501 that cooperate with the guide columns 4.

[0045] In detail, when the fixed mold core 3 and the movable mold core 6 are fixed on the fixed mold base plate 1 and the movable mold base plate 5 respectively, at this time, the mold can be installed on the injection molding machine, and the fixed mold base plate 1 is fixed on the injection molding machine, and the movable mold base plate 5 is movably installed on the injection molding machine. When injection molding is required, the movable mold base plate 5 can be controlled to move toward the fixed mold base plate 1, thereby driving the guide hole 501 to be inserted into the guide column 4. Under the action of the guide hole 501 and the guide column 4, the movable mold core 6 can be accurately and completely fitted with the fixed mold core 3 to ensure the best injection molding effect.

[0046] See also Figure 1 , Figure 2 , Figure 4-Figure 6 , Figure 8 , Fig. 9, locking mechanisms are respectively arranged on the fixed mold base plate 1 and the movable mold base plate 5, and a locking block 9 is connected to the locking mechanism, which cooperates with the mounting hole 7. The locking mechanism includes a rotating rod 8 rotatably mounted on the fixed mold base plate 1 and the movable mold base plate 5, respectively, and the rotating rod 8 is fixedly connected to the locking block 9. A straight groove 801 and an annular groove 802 are provided on the rotating rod 8; it also includes a first movable sleeve 10 slidably mounted on the rotating rod 8, and a first limit block 11 slidably connected to the straight groove 801 and the annular groove 802 is fixed on the inner wall of the first movable sleeve 10. A guide assembly is provided on the fixed mold base plate 1 and the movable mold base plate 5, wherein the guide assembly includes a guide rod 13 fixedly mounted on the fixed mold base plate 1 and the movable mold base plate 5, respectively, and a first guide sleeve 14 is slidably mounted on the guide rod 13, and a first movable plate 12 fixedly connected to the first movable sleeve 10 is fixed on the first guide sleeve 14.

[0047] It should be noted that the end of the straight groove 801 is connected with the end of the annular groove 802. In the initial state, under the action of the triggering rotation mechanism, the first movable plate 12 and the first movable sleeve 10 are located at the end of the stroke away from the fixed mold bottom plate 1, so that the first limit block 11 is located at the end of the stroke of the straight groove 801 away from the annular groove 802. The locking block 9 and the mounting hole 7 are in a matching state. When it is necessary to install the fixed mold core 3 and the movable mold core 6, the mounting hole 7 can be inserted into the rotating rod 8, so that the fixed mold core 3 and the movable mold core 6 move toward the fixed mold bottom plate 1 and the movable mold bottom plate 5 respectively. When the fixed mold core 3 and the movable mold core 6 are respectively in contact with the first movable sleeve 10, the first movable sleeve 10 is driven to move toward the bottom plate, and the first limit block 11 is driven to move along the length direction of the straight groove 801. The first movable sleeve 10 will also drive the first movable plate 12 to move, so that the first guide sleeve 14 moves along the guide rod 13. The first movable plate 12 also drives the follow-up rotating mechanism to move. When the first limit block 11 moves to the connection position between the straight groove 801 and the annular groove 802, the rotating rod 8 can rotate freely, and the locking block 9 disengages from the mounting hole 7. Under the action of the triggering rotating mechanism, the rotating rod 8 rotates to make the first limit block 11 move to the end of the stroke on the side of the annular groove 802 away from the straight groove 801. The rotating rod 8 also drives the locking block 9 to move, so that the locking block 9 fixes the fixed mold core 3 and the movable mold core 6. At the same time, under the action of the annular groove 802 and the first limit block 11, the fixed mold core 3 and the movable mold core 6 are further fixed to the fixed mold bottom plate 1 and the movable mold bottom plate 5 respectively.

[0048] Preferably, if the mold core needs to be inspected, at this time, the rotating rod 8 can be manually controlled to rotate toward the initial angle, so that the locking block 9 moves again to the position cooperating with the mounting hole 7. At the same time, the rotation mechanism is triggered to move and provide a certain driving force to the mold core. At this time, the mold core can be smoothly taken out to avoid the problem of having to completely dismantle the mold for inspection.

[0049] See also Figure 1 , Figure 2 , Figure 4-Figure 6 , Figure 8 , the locking mechanism is provided with a trigger rotation mechanism, which can be activated when the locking block 9 is inserted into the mounting hole 7, and drives the trigger rotation mechanism to move to adjust the matching state of the locking block 9 and the mounting hole 7, the trigger rotation mechanism includes a second guide sleeve 19 slidably mounted on the guide rod 13, a second movable plate 18 is fixed on the second guide sleeve 19, a second spring 20 abutting against the second movable plate 18 is sleeved on the rotating rod 8, and an elastic component connected with the second movable plate 18 is provided on the rotating rod 8, wherein the elastic component includes a spiral groove 803 opened on the rotating rod 8, a second movable sleeve 16 is slidably mounted on the rotating rod 8, and a second limit block 17 slidably connected with the spiral groove 803 is fixed on the inner wall of the second movable sleeve 16, and a first spring 15 is sleeved on the rotating rod 8, and the two ends of the first spring 15 abut against the first movable plate 12 and the second movable plate 18 respectively.

[0050] Further, in the initial state, the first spring 15 and the second spring 20 are both in a compressed state, and the elastic potential energy of the second spring 20 is greater than the elastic potential energy of the first spring 15. Under the action of the springs, the first movable plate 12 and the second movable plate 18 are at the end of the stroke away from the bottom plate. Under the action of the second movable plate 18, the distance between the second movable sleeve 16 and the first movable sleeve 10 is maximized. The second movable sleeve 16 will also control the second limit block 17 to be located at the end of the stroke on one side of the spiral groove 803. When the mold core needs to be installed, the mold core can be installed on the bottom plate. When the rotating rod 8 is inserted into the mounting hole 7 and the mold core abuts against the first movable sleeve 10, the first movable sleeve 10 is driven to move toward the bottom plate, so that the first limit block 11 moves along the length direction of the straight groove 801. The first limit block 11 and the straight groove 801 have a guiding function to ensure that the rotating rod 8 does not rotate. Therefore, the spiral groove 803 does not move, ensuring that the position of the second movable sleeve 16 does not change. Under the action of the first movable plate 12, the first spring 15 is The first spring 15 is compressed, and the elastic potential energy of the first spring 15 is greater than the elastic potential energy of the second spring 20, so that the pressure on the second movable plate 18 increases. When the first limit block 11 moves to the connection position of the straight groove 801 and the annular groove 802, the rotating rod 8 can rotate freely. At this time, the first spring 15 is elastically released and drives the second movable plate 18 to move toward the bottom plate. The second movable plate 18 will compress the second spring 20 and drive the second limit block 17 to slide along the trajectory of the spiral groove 803 through the second movable sleeve 16. The movable plate 18 will also drive the second guide sleeve 19 to move along the length direction of the guide rod 13 to ensure that the second movable sleeve 16 will not rotate. Under the action of the second limit block 17 and the spiral groove 803, the rotating rod 8 rotates to control the first limit block 11 to enter the annular groove 802. When the second limit block 17 moves to the end of the spiral groove 803, the first limit block 11 also moves to the end of the stroke of the annular groove 802 away from the side of the straight groove 801. The rotating rod 8 rotates to the maximum angle and the core is fixed to the bottom plate by the locking block 9.

[0051] See also Figure 1-Figure 4 , Figure 6 , Fig. 9 , a locking assembly is respectively arranged on the fixed mold core 3 and the movable mold core 6, the locking assembly can be activated when the locking block 9 moves, and locks the position of the locking block 9, the locking assembly includes a support rod 21 fixedly installed on the side walls of the fixed mold core 3 and the movable mold core 6, a limit plate 22 is slidably installed on the support rod 21, a limit groove 2201 cooperating with the locking block 9 is opened on the limit plate 22, and a third spring 23 abutting against the limit plate 22 is sleeved on the support rod 21.

[0052] To go further, in the initial state, the third spring 23 is in a compressed state, so that the limit plate 22 is located at the end of the stroke away from the side wall of the mold core. When the mold core needs to be fixed, the mounting hole 7 can be controlled to enter the rotating rod 8. When the mold core is in contact with the bottom plate, under the action of the first limit block 11 and the second limit block 17, the rotating rod 8 is rotated a certain angle to drive the locking block 9 to move. When the locking block 9 moves to the position abutting against the limit plate 22, since the limit plate 22 is in an arc shape on one side facing the locking block 9, the limit plate 22 will move along the length direction of the support rod 21 and compress the third spring 23. When the locking block 9 moves to the position coordinating with the limit groove 2201, the third spring 23 is elastically released at this time, and drives the limit plate 22 to move toward the initial position, so that the limit groove 2201 is fully engaged with the locking block 9, thereby fixing the locking block 9.

[0053] See also Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 7 , a follow-up ejection mechanism is arranged on the fixed mold core 3 and connected to the movable mold core 6, and is used to eject the injection molded product from the fixed mold core 3. The follow-up ejection mechanism includes a fixed rod 24 fixedly mounted on the fixed mold core 3 and symmetrically arranged, and a connecting plate 25 is slidably mounted on the fixed rod 24. A push rod 29 that abuts against the connecting plate 25 is fixed on the side wall of the movable mold core 6. A driven component connected to the connecting plate 25 is arranged on the fixed mold core 3, wherein the driven component includes a movable rod 26 fixedly mounted on the connecting plate 25 and passing through the fixed mold core 3, a support ring 27 that is slidably and sealingly connected to the fixed mold core 3 is fixed at the end of the movable rod 26, and a fourth spring 28 that abuts against the connecting plate 25 is sleeved on the movable rod 26.

[0054] To elaborate, when the fixed mold core 3 is fixed on the fixed mold bottom plate 1, the fourth spring 28 will abut against the bottom plate, and the fourth spring 28 is in a compressed state, so that the connecting plate 25 is located at the end of the stroke away from the bottom plate. Since the connecting plate 25 and the fixed rod 24 have a guiding function, it is ensured that the movable rod 26 will not deflect. At this time, the support ring 27 is in a position separated from the bottom of the fixed mold core 3. When injection molding is required, under the action of the injection molding machine, the movable mold core 6 is controlled to move toward the fixed mold core 3. The movable mold core 6 will also drive the push rod 29 to move. When the push rod 29 moves to the abutting position with the connecting plate 25, the connecting plate 25 is driven to move toward the fixed mold bottom plate 1 and the fourth spring 28 is compressed. The connecting plate 25 will also drive the movable rod 26 to move, so as to drive the support ring 27 to move toward the bottom of the fixed mold core 3. When the movable mold core 6 moves to the abutting position with the fixed mold core 3, the connecting plate 25 moves to the end of the stroke toward the fixed mold bottom plate 1, so that the support ring 27 and the fixed mold core 3 are completely and tightly fitted.

[0055] Preferably, at this time, injection molding can be carried out. After the injection molding is completed, the molded headrest can be cooled. After the cooling is completed, the movable mold core 6 can be driven to move in a direction away from the fixed mold core 3. At the same time, the movable mold core 6 will also drive the push rod 29 to move. At this time, the fourth spring 28 is elastically released and drives the connecting plate 25 to move in a direction away from the fixed mold bottom plate 1. The connecting plate 25 will also drive the movable rod 26 to move, so as to push the molded headrest out of the fixed mold core 3 through the support ring 27.

[0056] An injection molding method for processing an automobile headrest comprises the following steps:

[0057] Step 1: Place the fixed mold core 3 and the movable mold core 6 on the fixed mold bottom plate 1 and the movable mold bottom plate 5 respectively, and under the action of the fixed mold core 3 and the movable mold core 6, drive the locking mechanism to move and trigger the rotation mechanism to move, so that the locking block 9 cooperates with the mounting hole 7 to fix the fixed mold core 3 and the movable mold core 6 on the fixed mold bottom plate 1 and the movable mold bottom plate 5;

[0058] Step 2: At this time, the mold can be installed on the injection molding machine through the guide hole 2. After the mold is installed, the injection nozzle can be installed on the movable mold core 6;

[0059] Step 3: The injection molding machine can heat-melt the raw material, and under the action of the injection molding machine, the movable mold core 6 is controlled to move to a position that is closely fitted with the fixed mold core 3. At this time, the hot-melt raw material can be transported to the cavity formed by the fixed mold core 3 and the movable mold core 6 through the injection nozzle;

[0060] Step 4: After the injection molding is completed, the headrest is completely formed under the effect of cooling. Under the action of the injection molding machine, the movable mold core 6 is controlled to move away from the fixed mold core 3, and the molded product is ejected under the action of the follower ejection mechanism.

[0061] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0062] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A plastic injection mold, comprising: A fixed mold bottom plate and a movable mold bottom plate, wherein the fixed mold bottom plate and the movable mold bottom plate are respectively provided with guide holes symmetrically arranged; characterized in that: it also includes: a fixed mold core, which is installed on the fixed mold bottom plate, and the movable mold bottom plate is provided with a movable mold core, and the fixed mold core is provided with a positioning assembly connected with the movable mold core, and the fixed mold core and the movable mold core are respectively provided with mounting holes; A locking mechanism is respectively arranged on the fixed mold bottom plate and the movable mold bottom plate, the locking mechanism is connected to a locking block matched with the mounting hole, and the locking mechanism is provided with a trigger rotation mechanism, the locking mechanism can be actuated when the locking block is inserted into the mounting hole, and drives the trigger rotation mechanism to move, so as to adjust the matching state between the locking block and the mounting hole; A clamping assembly is respectively arranged on the fixed mold core and the movable mold core, and the clamping assembly can be activated when the locking block moves, and locks the position of the locking block; A follow-up ejection mechanism, which is arranged on the fixed mold core and connected to the movable mold core, and is used to eject the injection molded product out of the fixed mold core; The locking mechanism comprises a rotating rod rotatably mounted on the fixed mold bottom plate and the movable mold bottom plate respectively, the rotating rod is fixedly connected to the locking block, and a straight groove and an annular groove are formed on the rotating rod; It also includes a first movable sleeve slidably mounted on the rotating rod, a first limit block slidably connected to the straight groove and the annular groove is fixed on the inner wall of the first movable sleeve, and a guide assembly is provided on the fixed mold bottom plate and the movable mold bottom plate; The guide assembly comprises guide rods fixedly mounted on the fixed mold bottom plate and the movable mold bottom plate respectively, a first guide sleeve is slidably mounted on the guide rods, and a first movable plate fixedly connected to the first movable sleeve is fixed on the first guide sleeve; The trigger rotation mechanism comprises a second guide sleeve slidably mounted on the guide rod, a second movable plate is fixed on the second guide sleeve, a second spring abutting against the second movable plate is sleeved on the rotating rod, and an elastic component connected to the first movable plate is arranged on the rotating rod; The clamping assembly comprises support rods fixedly mounted on the side walls of the fixed mold core and the movable mold core respectively, a limit plate is slidably mounted on the support rod, a limit groove cooperating with the locking block is formed on the limit plate, a third spring abutting against the limit plate is sleeved on the support rod, and in an initial state, the third spring is in a compressed state; The elastic component includes a spiral groove opened on the rotating rod, a second movable sleeve is slidably mounted on the rotating rod, a second limit block slidably connected to the spiral groove is fixed to the inner wall of the second movable sleeve, a first spring is sleeved on the rotating rod, and the two ends of the first spring are respectively abutted against the first movable plate and the second movable plate; in an initial state, the first spring and the second spring are both in a compressed state, and the elastic potential energy of the second spring is greater than the elastic potential energy of the first spring.

2. A plastic injection mold according to claim 1, characterized in that: The positioning assembly comprises guide posts which are fixedly mounted on the fixed mold core and are symmetrically arranged, and the movable mold core is provided with guide holes which cooperate with the guide posts.

3. A plastic injection mold according to claim 1, characterized in that: The follower ejection mechanism includes a fixed rod fixedly mounted on the fixed mold core and symmetrically arranged, a connecting plate is slidably mounted on the fixed rod, a push rod that abuts against the connecting plate is fixed to the side wall of the movable mold core, and a driven component connected to the connecting plate is arranged on the fixed mold core.

4. A plastic injection mold according to claim 3, characterized in that: The driven assembly includes a movable rod fixedly mounted on the connecting plate and penetrating the fixed mold core, a support ring slidingly and sealingly connected to the fixed mold core is fixed to the end of the movable rod, and a fourth spring abutting against the connecting plate is sleeved on the movable rod.

5. An injection molding method for processing an automobile headrest, using the plastic injection mold according to any one of claims 1 to 4, characterized in that: The following steps are involved: The fixed mold core and the movable mold core are placed on the fixed mold bottom plate and the movable mold bottom plate respectively, and under the action of the fixed mold core and the movable mold core, the locking mechanism is driven to move and the rotating mechanism is triggered to move, so that the locking block is matched with the mounting hole to fix the fixed mold core and the movable mold core on the fixed mold bottom plate and the movable mold bottom plate; At this time, install the mold on the injection molding machine through the guide hole. After the mold is installed, install the injection nozzle on the moving mold core; The injection molding machine heat-melts the raw material, and under the action of the injection molding machine, controls the movable mold core to move to a position that is closely fitted with the fixed mold core. At this time, the hot-melt raw material is transported to the cavity formed by the fixed mold core and the movable mold core through the injection nozzle; When the injection molding is completed, the headrest is completely formed under the effect of cooling. Under the action of the injection molding machine, the movable mold core is controlled to move in a direction away from the fixed mold core, and the molded product is ejected under the action of the follower ejection mechanism.

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