Modified polyethylene plastic injection molding equipment

Abstract

The invention discloses modified polyethylene plastic injection molding equipment, and relates to the technical field of injection molding equipment, the modified polyethylene plastic injection molding equipment comprises a rack, and a female die and a male die which are horizontally and slidably connected to the rack, the female die or the male die is connected with the rack through a hydraulic rod, and the modified polyethylene plastic injection molding equipment further comprises locking assemblies and a control assembly, the locking device is used for locking and limiting the female die or the male die. The ejector rod piece is used for supporting the female die and the male die; when the ejector rod piece is inserted into the stroke of the female die and the male die, the locking assembly is unlocked, and therefore the female die and the male die can be disassembled at the same time. The locking assembly is arranged between the hydraulic rod and the female die or the male die, when the ejector rod piece is correspondingly inserted into the stroke of the female die and the stroke of the male die to trigger the locking assembly, the locking assembly is unlocked, the female die and the male die are separated from the hydraulic rod, the female die and the male die are located on the ejector rod piece at the moment, the ejector rod piece is moved out of the machine frame, and the hydraulic rod piece is locked. And therefore, the female die and the male die are disassembled.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding equipment, in particular to a modified polyethylene plastic injection molding equipment. Background Art

[0002] The injection molding process refers to the process of pressurizing and injecting molten raw materials into a mold, cooling and molding, and then demolding to produce semi-finished products of a certain shape. The injection molding process of plastic parts mainly includes six stages: mold closing - filling - (gas-assisted, water-assisted) pressure holding - cooling - mold opening - demolding.

[0003] In the invention patent application with publication number: CN112223697A, publication date: 2021-01-15, and invention name "A kind of injection molding machine", it includes a frame, a clamping device and an extrusion device are fixed on the top of the frame, the extrusion device includes an insulation box, an axially horizontally arranged screw is rotatably connected in the insulation box, a stepping motor for driving the screw to rotate is fixed at one end of the extrusion device away from the clamping device, and a conical die nozzle is provided at one end of the insulation box close to the clamping device; an evaporation chamber protruding from the top of the insulation box is fixed on the top of the insulation box, an evaporation plate is fixed on the top of the evaporation chamber, mesh holes for water vapor and harmful gases to be dispersed are evenly opened on the evaporation plate, and an isolation cover is fixed on the top of the evaporation chamber, a containing cavity is formed between the isolation cover and the evaporation chamber, and a purification device for treating harmful gases in the containing cavity is connected to the isolation cover. This application has the effect of reducing the entry of water vapor and harmful gases into the cavity during hot melting and reducing the appearance of bubbles on the product.

[0004] In the existing technologies including the above-mentioned patents, although the mold and the injection molding machine are connected in a detachable manner, the die or the punch needs to be disassembled separately during the disassembly process, and the die or the punch needs to be installed separately during the installation process. Therefore, it is difficult to disassemble the die and the punch at the same time, making the installation or disassembly of the mold more complicated. Summary of the invention

[0005] The object of the present invention is to provide a modified polyethylene plastic injection molding device to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A modified polyethylene plastic injection molding device comprises a frame and a die and a punch connected to the frame in a horizontal sliding manner, wherein the die or the punch is connected to the frame via a hydraulic rod, and further comprises: a locking assembly which is respectively arranged on the die and the punch and is used to lock and limit the die or the punch; a push rod which is used to support the die and the punch; when the push rod is inserted into the stroke of the die and the punch, the locking assembly is unlocked, thereby realizing the simultaneous disassembly of the die and the punch.

[0008] Preferably, the locking assembly comprises a plurality of connecting posts respectively slidably connected to the female mold or the male mold, and each connecting post is respectively connected to the female mold or the male mold via a fourth spring.

[0009] Preferably, each of the connecting posts is slidably connected with two clamping blocks in the radial direction, and each clamping block is connected to the connecting post via a third spring.

[0010] Preferably, each end of the hydraulic rod is fixedly connected to a mounting column. Each mounting column is arranged in one-to-one correspondence with the connecting column, and each mounting column is provided with one or two slots adapted to the block in the radial direction.

[0011] Preferably, the two side walls opposite to the concave mold and the convex mold are connected with through holes adapted to the push rod member. When the push rod member is inserted, it abuts against each connecting column, thereby driving each card block to disengage from the adapted card slot, thereby achieving unlocking.

[0012] Preferably, a locking assembly is provided between the die and the punch, and the locking assembly is used to lock and limit the die and the punch during the insertion stroke of the ejector rod.

[0013] Preferably, the locking assembly comprises a driving unit and a limiting unit, wherein the driving unit is arranged on the female mold, and the driving unit drives the limiting unit to lock and limit the male mold during the process of receiving the abutment of the ejector rod.

[0014] Preferably, the driving unit comprises abutment blocks slidably connected to opposite sides of the die and a locking rod fixedly connected to the abutment blocks, and the abutment blocks and the die are connected via a first spring.

[0015] Preferably, two locking blocks are slidably connected to the locking rod, and each locking block is connected to the locking rod via a second spring.

[0016] Preferably, locking grooves matching the locking blocks are provided on two opposite sides of the male mold.

[0017] In the above technical scheme, the present invention provides a modified polyethylene plastic injection molding equipment, which has a locking assembly between the hydraulic rod and the die or the punch. When the push rod is inserted into the stroke of the die and the punch respectively, the locking assembly is triggered, so that the locking assembly is unlocked, and then the end of the hydraulic rod is shortened, so that the die and the punch are respectively separated from the hydraulic rod. At this time, the die and the punch are located on the push rod, so that the push rod is moved out of the frame, thereby realizing the disassembly of the die and the punch.

[0018] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0019] This application document provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1-3 A schematic diagram of the overall structure of an injection molding mechanism provided by an embodiment of the present invention;

[0022] Figure 4-6 A schematic diagram of the structure of the concave mold and the convex mold in various states provided by an embodiment of the present invention;

[0023] Figure 7-8 A schematic diagram of a die structure provided in an embodiment of the present invention;

[0024] Fig. 9 A schematic diagram of a male mold structure provided in an embodiment of the present invention;

[0025] Figure 10-11 A schematic diagram of the structure of a locking assembly provided in an embodiment of the present invention;

[0026] Fig.12 A schematic diagram of a locking rod structure provided in an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1. Frame; 1.1. Concave die; 1.10. Connecting groove; 1.11. First spring; 1.12. Abutment block; 1.13. Locking rod; 1.130. First mounting groove; 1.131. First waist-shaped groove; 1.132. Second waist-shaped groove; 1.14. Locking block; 1.140. Second spring; 1.141. First transmission pin; 1.142. Second transmission pin; 1.2. Convex die; 1.20. Limiting groove; 1.21. Locking groove; 1.3 , hydraulic rod; 1.30, mounting column; 1.301, slot; 1.4, push rod; 1.5, locking assembly; 1.50, connecting column; 1.501, second mounting slot; 1.502, third waist-shaped slot; 1.503, fourth waist-shaped slot; 1.51, block; 1.511, third spring; 1.512, third transmission pin; 1.513, fourth transmission pin; 1.60, mounting hole; 1.61, fourth spring; 1.62, socket. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0030] Reference Figure 1-12 As shown, the present invention provides a modified polyethylene plastic injection molding device, a frame 1 and a die 1.1 and a punch 1.2 horizontally slidably connected to the frame 1, the die 1.1 or the punch 1.2 are respectively connected to the frame 1 through a hydraulic rod 1.3, and further includes: a locking assembly 1.5: which is respectively arranged on the die 1.1 and the punch 1.2, and is used to lock and limit the die 1.1 or the punch 1.2;

[0031] Ejector 1.4: used to support the die 1.1 and the punch 1.2;

[0032] When the ejector rod 1.4 is inserted into the travel of the female die 1.1 and the male die 1.2, the locking assembly 1.5 is unlocked, thereby realizing the simultaneous disassembly of the female die 1.1 and the male die 1.2.

[0033] Specifically, Figure 1-3As shown, the frame 1 is slidably connected with a die 1.1 and a punch 1.2 in the horizontal direction, and 2-4 hydraulic rods 1.3 are fixedly connected to the opposite side walls of the frame 1, respectively. The hydraulic rods 1.3 are connected in series so that the hydraulic rods 1.3 keep synchronous movement. The ends of the multiple hydraulic rods 1.3 on one side of the inner wall of the frame 1 are fixedly connected with a punch 1.2, and the hydraulic rods 1.3 on the other side of the frame 1 are fixedly connected with the die 1.1. The die 1.1 and the punch 1.2 are arranged in a one-to-one correspondence. The hydraulic rods 1.3 drive the die 1.1 and the punch 1.2 to slide in the horizontal direction of the frame 1. The die 1.1 and the punch 1.2 are driven by the hydraulic rods 1.3. 1.2 has two states, the first state is the mold closing state, when the die 1.1 and the punch 1.2 are in the mold closing state, injection molding can be carried out, or the die 1.1 and the punch 1.2 can be disassembled, the second state of the die 1.1 and the punch 1.2 is after injection molding, the injection molded part on the punch 1.2 needs to be demolded, at this time the die 1.1 and the punch 1.2 are in a separated state, in this embodiment the injection cavity formed between the die 1.1 and the punch 1.2 can be set according to the processed injection molded part, in this embodiment the die 1.1 and the punch 1.2 are only shown schematically, and do not show the shape of the processed injection molded part, and the hydraulic rod 1.3 and the ejector 1.4.

[0034] Locking assembly 1.5: It is respectively arranged on the die 1.1 and the punch 1.2, and is used to lock and limit the die 1.1 or the punch 1.2; that is, the locking assembly 1.5 is respectively located on the die 1.1 and the punch 1.2, and the locking assembly 1.5 is used to connect the hydraulic rod 1.3 and the die 1.1 or the punch 1.2 by plugging or clamping or other detachable methods. The die 1.1 and the hydraulic rod 1.3 or the punch 1.2 and the hydraulic rod 1.3 are connected by the locking assembly 1.5. The locking assembly 1.5 has a locked state and an unlocked state. Since the mold will be worn after being used for a period of time or the mold needs to be repaired, or a mold of a different model needs to be replaced, it is necessary to remove the mold from the frame 1, so the mold needs to be installed and removed quickly.

[0035] Ejector 1.4: It is used to support the die 1.1 and the punch 1.2; the ejector 1.4 is driven by a hydraulic system or a mechanical handling system, so that the ejector 1.4 moves in the Z-axis direction of the frame 1, and the ejector 1.4 can be inserted into the die 1.1 and the punch 1.2. The locking assembly 1.5 is unlocked by the insertion stroke of the ejector 1.4, so that the punch 1.2 or the die 1.1 is unlocked from the hydraulic rod 1.3 respectively. At this time, the hydraulic rod 1.3 is retracted again, so that the hydraulic rod 1.3 is separated from the die 1.1 and the punch 1.2 respectively, and then moves in the Z-axis direction of the frame 1 through the ejector 1.4, and is removed from the frame 1, so as to realize the disassembly of the die 1.1 and the punch 1.2.

[0036] During use, when the die 1.1 and the punch 1.2 are in the mold closing state, the push rod 1.4 is inserted into the die 1.1 and the punch 1.2, and the locking assembly 1.5 is unlocked by the insertion stroke of the push rod 1.4, so that the punch 1.2 or the die 1.1 is unlocked from the hydraulic rod 1.3 respectively. At this time, the hydraulic rod 1.3 is retracted again, so that the hydraulic rod 1.3 is separated from the die 1.1 and the punch 1.2 respectively, and then the push rod 1.4 moves in the Z-axis direction of the frame 1 and moves out of the frame 1, thereby realizing the disassembly of the die 1.1 and the punch 1.2.

[0037] Reference Figure 4-11 As shown, in another embodiment provided by the present invention, the locking assembly 1.5 includes a plurality of connecting posts 1.50 respectively slidably connected to the female mold 1.1 or the male mold 1.2, and each connecting post 1.50 is respectively connected to the female mold 1.1 or the male mold 1.2 via a fourth spring 1.61.

[0038] Each connecting column 1.50 is slidably connected with two clamping blocks 1.51 in the radial direction, and each clamping block 1.51 is connected to the connecting column 1.50 via a third spring 1.511.

[0039] The end of each hydraulic rod 1.3 is fixedly connected with a mounting column 1.30. Each mounting column 1.30 is arranged one-to-one with a connecting column 1.50, and each mounting column 1.30 is provided with one or two clamping grooves 1.301 adapted to the clamping block 1.51 in the radial direction.

[0040] The opposite side walls of the die 1.1 and the punch 1.2 are both connected with through holes adapted to the ejector rod 1.4. When the ejector rod 1.4 is inserted, it abuts against the connecting columns 1.50, thereby driving the clamping blocks 1.51 to disengage from the adapted slots 1.301, thereby achieving unlocking.

[0041] Specifically, the concave mold 1.1 and the convex mold 1.2 are provided with mounting holes 1.60 at positions corresponding to the hydraulic rods 1.3, and each mounting hole 1.60 is arranged corresponding to the position of each hydraulic rod 1.3. A connecting column 1.50 is slidably connected in each mounting hole 1.60, and each connecting column 1.50 is connected to its corresponding mounting hole 1.60 via a fourth spring 1.61. Fig.11As shown, two second mounting grooves 1.501 are radially arranged around the connecting column 1.50, and each mounting groove is arranged one-to-one with each clamping block 1.51. A third waist-shaped groove 1.502 is arranged on the opposite side walls of each mounting groove, and a fourth waist-shaped groove 1.503 is arranged at the bottom end of each mounting groove. A third transmission pin 1.512 matched with the third waist-shaped groove is fixedly connected on the opposite side walls of each clamping block 1.51, and a fourth transmission pin 1.513 matched with the fourth waist-shaped groove 1.503 is provided at the bottom end of each clamping block 1.51, and a third spring 1.511 is fixedly connected to each block, and the other end of the third spring 1.511 is abutted against the connecting column 1.50.

[0042] A plug hole 1.62 is provided at a position corresponding to each mounting hole 1.60 on the die 1.1 and the punch 1.2, and each plug hole 1.62 is through-connected with the corresponding mounting hole 1.60. The push rod 1.4 has a push column matched with the position of each plug hole 1.62. The push column is inserted into the plug hole 1.62, so that the push column abuts against the connecting column 1.50 during the insertion process, thereby achieving unlocking.

[0043] In the user process, such as Figure 3 In this way, the top column on the top rod 1.4 is inserted into the socket 1.62 on the female mold 1.1 and the male mold 1.2 in sequence, and the top column interacts with the connecting column 1.50 during the insertion process, so that the top column moves in the installation grooves on the female mold 1.1 and the male mold 1.2. Since the block 1.51 is inserted into the slot 1.301 at this time, each block 1.51 is restricted in the radial direction of the connecting column 1.50, so that the connecting column 1.50 moves in its axial direction, and the block 1.51 is forced to move along the The third waist groove 1.502 moves, so that each block 1.51 moves in the radial direction of the connecting column 1.50, so that each block 1.51 compresses the third spring 1.511 during the movement, so that the block 1.51 is disengaged from the slot 1.301. At this time, the hydraulic rod 1.3 contracts, so that the hydraulic rod 1.3 is separated from the die 1.1 and the punch 1.2 respectively, and then the push rod 1.4 moves in the Z-axis direction of the frame 1 and moves out of the frame 1, so as to realize the disassembly of the die 1.1 and the punch 1.2;

[0044] When the user needs to install the mold, the ejector rod drives the die 1.1 and the punch 1.2 to move into the frame 1, so that each connecting column 1.50 is set correspondingly to the mounting column 1.30 on the hydraulic rod 1.3. At this time, the hydraulic rod 1.3 is extended, so that the mounting columns 1.30 on the hydraulic rods 1.3 are sequentially inserted into the corresponding connecting columns 1.50, thereby limiting the die 1.1 and the punch 1.2, and then the ejector rod 1.4 is pulled out of the socket 1.62, so that the connecting column 1.50 is reset, and then each block 1.51 is inserted into the corresponding slot, so that the die 1.1 and the punch 1.2 are installed.

[0045] Reference Figure 3-6 As shown in FIG12 , in another embodiment of the present invention, a locking assembly is provided between the die 1.1 and the punch 1.2, and the locking assembly is used to lock and limit the die 1.1 and the punch 1.2 during the insertion stroke of the push rod 1.4.

[0046] The locking assembly includes a driving unit and a limiting unit. The driving unit is arranged on the female mold 1.1. The driving unit drives the limiting unit to lock and limit the male mold 1.2 during the process of receiving the abutment of the ejector rod 1.4.

[0047] The driving unit comprises abutment blocks 1.12 slidably connected to opposite sides of the female die 1.1 and a locking rod 1.13 fixedly connected to the abutment blocks 1.12. The abutment blocks 1.12 and the female die 1.1 are connected via a first spring 1.11.

[0048] Two locking blocks 1.14 are slidably connected to the locking rod 1.13, and each locking block 1.14 is connected to the locking rod 1.13 via a second spring 1.140.

[0049] The opposite sides of the punch 1.2 are provided with locking grooves 1.21 adapted to the locking blocks 1.14.

[0050] Specifically, Figure 6-8 As shown, two connecting grooves 1.10 are respectively provided on the opposite side walls of the concave mold 1.1, and a first spring 1.11 is fixedly connected in each connecting groove 1.10. An abutment block 1.12 is slidably connected to the opposite sides of the concave mold 1.1. The abutment block 1.12 has a connecting pin adapted to the connecting groove 1.10. The other end of each first spring 1.11 is fixedly connected to the connecting pin arranged correspondingly thereto. A sliding groove adapted to a locking rod 1.13 is provided on the concave mold 1.1 and the punch 1.2. A limiting groove 1.20 is provided at a position corresponding to the locking rod 1.13 on the punch 1.2. A locking groove 1.21 adapted to a locking block 1.14 is provided on the opposite side walls of the limiting groove 1.20. Fig.12As shown, the locking rod 1.13 is fixedly connected to the abutment block 1.12, and a first installation groove 1.130 is provided on the opposite side walls of the locking rod 1.13, a first waist-shaped groove 1,131 is provided on the opposite side walls of the first installation groove 1.130, and a second waist-shaped groove 1.132 is provided on the first installation groove 1.130, and a first transmission pin 1.141 adapted to the first waist-shaped groove 1,131 is provided on the opposite side walls of the locking block 1.14, and a second transmission pin 1.142 adapted to the second waist-shaped groove is fixedly connected to the other side wall of the locking block 1.14, the first transmission pin 1.141 is respectively located in the first waist-shaped groove corresponding to it, and the second transmission pin 1.142 is located in the second waist-shaped groove 1.132 corresponding to it, and a second spring 1.140 is fixedly connected to the side wall of each locking block 1.14, and the other end of each second spring 1.140 abuts against the inner wall of the locking rod 1.13.

[0051] During use, if Figure 3 In this way, the ejector column on the ejector member 1.4 is inserted into the sockets 1.62 on the female mold 1.1 and the male mold 1.2 in sequence, and during the insertion process, the ejector column interacts with the connecting column 1.50 and the abutment block 1.12 respectively, so that the ejector column moves in the mounting grooves on the female mold 1.1 and the male mold 1.2. Since the clamping block 1.51 is inserted into the clamping groove 1.301 at this time, each clamping block 1.51 is restricted in the radial direction of the connecting column 1.50, so that the connecting column 1.50 moves in its axial direction. At this time, the clamping block 1.51 is forced to move along the third waist groove 1.502, so that each clamping block 1.51 moves toward the radial direction of the connecting column 1.50, so that each clamping block 1.51 compresses the third spring 1.511 during the movement. , thereby making the card block 1.51 disengage from the card slot 1.301, and the abutment block 1.12 under the action of the push rod 1.4 makes the abutment block slide radially above the push rod 1.4 while compressing the first spring 1.11, so that the abutment block 1.12 drives the locking rod 1.13 to move, and then the locking rod 1.13 is inserted into the limiting groove 1.20 of the punch 1.2, and then each locking block 1.14 is inserted into the corresponding locking groove 1.21, so as to realize the locking and limiting of the punch 1.2 and the die 1.1, at this time, the hydraulic rod 1.3 contracts, so that the hydraulic rod 1.3 is separated from the die 1.1 and the punch 1.2 respectively, and then the push rod 1.4 moves in the Z-axis direction of the frame 1 and moves out of the frame 1, so as to realize the disassembly of the die 1.1 and the punch 1.2;

[0052] When the user needs to install the mold, the ejector rod drives the die 1.1 and the punch 1.2 to move into the frame 1, so that each connecting column 1.50 is set correspondingly to the mounting column 1.30 on the hydraulic rod 1.3. At this time, the hydraulic rod 1.3 is extended, so that the mounting columns 1.30 on the hydraulic rods 1.3 are sequentially inserted into the corresponding connecting columns 1.50, so as to limit the die 1.1 and the punch 1.2, and then the ejector rod 1.4 is pulled out from the socket 1.62, so that the abutment block 1.12 and the connecting column 1.50 are reset respectively, and then each card block 1.51 is inserted into the corresponding slot, so as to install the die 1.1 and the punch 1.2, and the locking block 1.14 is disengaged from the locking groove 1.21, so as to unlock the die 1.1 and the punch.

[0053] 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 modified polyethylene plastic injection molding device, comprising a frame (1) and a die (1.1) and a punch (1.2) horizontally slidably connected to the frame (1), wherein the die (1.1) or the punch (1.2) is connected to the frame (1) via a hydraulic rod (1.3), characterized in that: Also includes: A locking assembly (1.5): which is respectively arranged on the female die (1.1) and the male die (1.2) and is used to lock and limit the female die (1.1) or the male die (1.2); Ejector member (1.4): used for supporting the die (1.1) and the punch (1.2); When the push rod (1.4) is inserted into the stroke of the female die (1.1) and the male die (1.2), the locking assembly (1.5) is unlocked, thereby achieving simultaneous disassembly of the female die (1.1) and the male die (1.2).

2. A modified polyethylene plastic injection molding device according to claim 1, characterized in that: The locking assembly (1.5) comprises a plurality of connecting columns (1.50) respectively slidably connected to the female mold (1.1) or the male mold (1.2), and each connecting column (1.50) is respectively connected to the female mold (1.1) or the male mold (1.2) via a fourth spring (1.61).

3. A modified polyethylene plastic injection molding device according to claim 2, characterized in that: Each of the connecting columns (1.50) is slidably connected to two clamping blocks (1.51) in the radial direction, and each clamping block (1.51) is connected to the connecting column (1.50) via a third spring (1.511).

4. A modified polyethylene plastic injection molding device according to claim 3, characterized in that: The end of each hydraulic rod (1.3) is fixedly connected to a mounting column (1.30). Each mounting column (1.30) is arranged in one-to-one correspondence with the connecting column (1.50), and each mounting column (1.30) is provided with one or two slots (1.301) adapted to the block (1.51) in the radial direction.

5. A modified polyethylene plastic injection molding device according to claim 4, characterized in that: The opposite side walls of the concave mold (1.1) and the convex mold (1.2) are both connected with through holes that match the push rod (1.4); when the push rod (1.4) is inserted into the stroke, it abuts against each connecting column (1.50), thereby driving each clamping block (1.51) to disengage from the matching clamping slot (1.301), thereby achieving unlocking.

6. A modified polyethylene plastic injection molding device according to claim 1, characterized in that: A locking assembly is provided between the female die (1.1) and the male die (1.2), and the locking assembly is used to lock and limit the female die (1.1) and the male die (1.2) during the insertion stroke of the ejector rod (1.4).

7. A modified polyethylene plastic injection molding device according to claim 6, characterized in that: The locking assembly comprises a driving unit and a limiting unit. The driving unit is arranged on the female mold (1.1). The driving unit drives the limiting unit to lock and limit the male mold (1.2) during the process of receiving the abutment of the ejector rod (1.4).

8. A modified polyethylene plastic injection molding device according to claim 7, characterized in that: The driving unit comprises abutment blocks (1.12) slidably connected to opposite sides of the concave die (1.1) and a locking rod (1.13) fixedly connected to the abutment blocks (1.12); the abutment blocks (1.12) and the concave die (1.1) are connected via a first spring (1.11).

9. A modified polyethylene plastic injection molding device according to claim 8, characterized in that: Two locking blocks (1.14) are slidably connected to the locking rod (1.13), and each locking block (1.14) is connected to the locking rod (1.13) via a second spring (1.140).

10. A modified polyethylene plastic injection molding device according to claim 9, characterized in that: Locking grooves (1.21) matching the locking blocks (1.14) are provided on opposite sides of the male mold (1.2).

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