CN115284517A - Screw rod lining plastic molding die device - Google Patents

Abstract

The invention relates to a screw rod lining plastic die pressing device, which relates to the technical field of die pressing devices, and comprises a bottom die and an upper die arranged at the upper end part of the bottom die, wherein a containing groove is formed in the bottom die, a die core is fixedly arranged in the containing groove, a sliding groove is formed in the side surface of the bottom die, a rectangular groove is formed in the bottom surface of the bottom die, slots are formed in the inner wall surfaces of two sides of the containing groove, thrust can be applied to two contact blocks by downwards moving a push block, so that the two contact blocks originally move mutually, two sliding rods can be driven to mutually keep away from and move through the mutual keeping away and moving of the two contact blocks, two protective shells can be driven to mutually keep away and move through the mutual keeping away and moving of the two sliding rods, so that a gap formed between the two protective shells is enlarged, namely, the cavity is enlarged, the two sides of a formed part can be separated from the inner walls of the two protective shells, a user can take the formed part out of the containing groove, the demoulding is more convenient, and the operation is more convenient.

Description

Screw rod lining plastic molding die device

Technical Field

The invention relates to the technical field of die pressing devices, in particular to a screw plastic-lined die pressing device.

Background

The mould is used for obtaining various tools of required products by injection molding, blow molding, extrusion, die casting or forging forming, smelting, stamping and other methods in industrial production. In short, a mold is a tool used to make a shaped article, the tool being made up of various parts, different molds being made up of different parts. The method realizes the processing of the shape of an article mainly through the change of the physical state of a formed material. Plain has the designation of "industrial mother".

At present, the screw rod lining plastic molding die device on the market is not convenient for take out the formed part in the molding cavity in the in-service use process, and the drawing of patterns is comparatively inconvenient, has reduced the production efficiency that the screw rod lined and is moulded, therefore needs a screw rod lining plastic molding die device urgently.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a screw liner plastic die assembly.

In order to solve the technical problems, the invention provides the following technical scheme: the utility model provides a screw rod lining moulding-die device, includes the die block and installs the last mould at the die block upper end, be provided with the holding tank in the die block, fixed mounting has the mold core in the holding tank, the spout has been seted up to the side surface of die block, the rectangular channel has been seted up to the bottom surface of die block, the slot has all been seted up to the both sides internal face of holding tank, the activity is provided with two protecting crust, two in the holding tank the protecting crust sets up respectively in the both sides of mold core, every the equal fixed mounting in upper and lower both ends of protecting crust has an inserted block, every the inserted block activity is pegged graft respectively in the slot, two the protecting crust is formed with the shaping chamber, be provided with on the die block and rock the structure, rock the structure and include motor, pivot and ejector pad, the output shaft of motor rotates and installs on the die block with the tip fixed connection of pivot, fixed mounting has the lug in the pivot, fixed mounting has first conical gear in the pivot, the upper end fixed mounting of ejector pad has the spheroid, the ejector pad sets up in the below of lug, the bottom surface of lug laminates with spheroidal top surface, be provided with the top surface of spheroid in the ejector pin of spheroid, the ejector pin that the movable ring is in the bottom surface of the ejector pin, the ejector pin that the ejector pin is in the rectangular channel, the ejector pin is the movable ring both ends of the ejector pin that the ejector pin is all exists in the ejector pin in the upper side of the ejector pin.

Preferably, two the equal fixed mounting in both ends that the protecting crust deviates from mutually has the slide bar, two the die block, two are run through in the equal activity of slide bar equal fixed mounting has the plectane, two on the slide bar equal fixed mounting has first spring, two on the plectane is respectively through the outside end fixed connection of plectane and die block.

Preferably, two opposite ends of the two protective shells are fixedly provided with contact blocks, the two contact blocks and the push block are both in a trapezoidal shape, the push block is movably inserted between the two contact blocks, and the surfaces of two sides of the push block are respectively attached to the surfaces of the two contact blocks.

Preferably, the end part of the push block is fixedly provided with a sliding block, the bottom end of the sliding block is fixedly provided with a second spring, the sliding block is movably inserted into the sliding groove, and the sliding block is fixedly connected with the bottom surface of the inner wall of the sliding groove through the second spring.

Preferably, the bottom end of the bottom die is fixedly provided with a shell, the shell is fixedly provided with three limiting rods, and each limiting rod is movably inserted into the two contact blocks and the push block respectively.

Preferably, the first rotating rod is rotatably installed on the housing, a second bevel gear is fixedly installed at the upper end of the first rotating rod, the first bevel gear is meshed with the second bevel gear, and a first gear is fixedly installed at the bottom end of the first rotating rod.

Preferably, the bottom of die block rotates and installs second bull stick and third bull stick, fixed mounting has the second gear on the second bull stick, fixed mounting has the third gear on the third bull stick, first gear, second gear and third gear all set up in the shell.

Preferably, the third rotating rod is arranged in the rectangular groove, penetrates through the ejector rod and is in threaded connection with the ejector rod.

Preferably, the first gear is engaged with the second gear, the third gear is engaged with the second gear, and the motor is fixedly mounted on the housing.

Preferably, the two protection shells are arc-shaped, the two ends of the upper side of the ejector rod are both fixedly provided with a first magnet block, and the bottom end of the push ring is fixedly provided with a second magnet block matched with the first magnet block.

Compared with the prior art, the invention can achieve the following beneficial effects:

one of them, can exert thrust to two contact blocks through ejector pad downstream, make two contact blocks remove each other originally, keep away from each other through two contact blocks and remove and can drive two slide bars and keep away from the removal each other, keep away from each other through two slide bars and remove and can drive two protecting crust and keep away from the removal each other, make the space that forms between two protecting crust enlarge, the cavity that becomes enlarges, the both sides of formed part can break away from with the inner wall of two protecting crust this moment, the user alright take out the formed part from the holding tank, the drawing of patterns is convenient more, it is more convenient to operate.

Its two, the rotation that lasts through pivot and lug can make two protecting crust be close to each other and keep away from the removal each other for it is easier that the formed part in the holding tank breaks away from with two protecting crust, and when need not the drawing of patterns, two protecting crust closure formations are sealed, and the device structural design is reasonable, and it is more convenient to use.

And thirdly, because the third rotating rod is in threaded connection with the ejector rod, the third rotating rod can drive the ejector rod to move upwards through rotation of the third rotating rod, the ejector rod can be pushed to move the ejector ring through upward movement of the ejector rod, the ejector ring can be moved in the accommodating groove, the formed part in the accommodating groove can be pushed through movement of the ejector ring, the formed part can be separated from the accommodating groove more easily, demoulding is more convenient, and demoulding efficiency of the die pressing device is improved.

Fourthly, when the push ring needs to reset, because the bottom fixed mounting of push ring has magnet piece two, the both ends fixed mounting of first pivot upside has magnet piece one, and motor output shaft reverses, can make the ejector pin drive the push ring and upwards remove, can make the push ring reset, has avoided the motion to interfere, has guaranteed this steady operation of rocking the structure and promoting the structure, and this die assembly structural design is reasonable, and the practicality is high.

Fifthly, the inserting blocks are fixedly arranged at the two ends of the protecting shell respectively and are arranged in the slots in a sliding mode, the limiting effect is achieved on the position of the protecting shell, the situation that the two protecting shells deviate in position is avoided, the two protecting shells can be sealed in a closed mode, and stable use of the die pressing device is guaranteed.

Drawings

FIG. 1 is a schematic view of the structure of a die assembly according to the present invention;

FIG. 2 is a schematic view of a contact block according to the present invention;

FIG. 3 is a schematic sectional view of the bottom mold of the present invention;

FIG. 4 is a schematic view of the protective shell of the present invention;

FIG. 5 is a schematic view of a first rotating rod according to the present invention;

FIG. 6 is a schematic structural view of a push block according to the present invention;

FIG. 7 is an enlarged schematic view of the structure of FIG. 1 at A.

Wherein: 1. bottom die; 11. accommodating grooves; 12. a chute; 13. a rectangular groove; 14. a slot; 15. a housing; 16. a limiting rod; 2. an upper die; 3. a protective shell; 31. inserting a block; 32. a slide bar; 33. a circular plate; 34. a first spring; 35. a contact block; 4. a motor; 5. a rotating shaft; 51. a bump; 52. a first bevel gear; 6. a push block; 61. a sphere; 62. a slider; 63. a second spring; 7. a top rod; 71. a push ring; 8. a first rotating lever; 81. a second bevel gear; 82. a first gear; 83. a second rotating rod; 84. a second gear; 85. a third rotating rod; 86. a third gear.

Detailed Description

The present invention will be further described with reference to specific embodiments for the purpose of facilitating an understanding of technical means, characteristics of creation, objectives and functions realized by the present invention, but the following embodiments are only preferred embodiments of the present invention, and are not intended to be exhaustive. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention. The experimental methods in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used in the following examples are commercially available unless otherwise specified.

As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6 and fig. 7, a screw plastic-lined die assembly comprises a bottom die 1 and an upper die 2 mounted on the upper end of the bottom die 1, wherein a containing groove 11 is arranged in the bottom die 1, a die core is fixedly mounted in the containing groove 11, a sliding groove 12 is formed in the side surface of the bottom die 1, a rectangular groove 13 is formed in the bottom surface of the bottom die 1, inserting grooves 14 are formed in the inner wall surfaces of the two sides of the containing groove 11, two protective shells 3 are movably arranged in the containing groove 11, the two protective shells 3 are respectively arranged on the two sides of the die core, inserting blocks 31 are fixedly mounted at the upper end and the lower end of each protective shell 3, each inserting block 31 is respectively and movably inserted in the inserting groove 14, a forming cavity is formed in each of the two protective shells 3, a shaking structure is arranged on the bottom die 1, the shaking structure comprises a motor 4, a rotating shaft 5 and a pushing block 6, the rotating shaft 5 is rotatably mounted on the bottom die 1, an output shaft of a motor 4 is fixedly connected with the end part of a rotating shaft 5, a lug 51 is fixedly installed on the rotating shaft 5, a first bevel gear 52 is fixedly installed on the rotating shaft 5, a ball body 61 is fixedly installed at the upper end of a push block 6, the push block 6 is arranged below the lug 51, the bottom surface of the lug 51 is attached to the top surface of the ball body 61, a pushing structure is arranged on a bottom die 1 and comprises a push rod 7 and a first rotating rod 8, a push ring 71 is movably installed in a containing groove 11, the push ring 71 is movably sleeved on a die core, the push rod 7 is U-shaped, the push rod 7 is slidably arranged in a rectangular groove 13, two ends of the upper side of the push rod 7 are movably inserted in the containing groove 11, a certain gap is formed between two ends of the upper side of the rectangular groove 13 and the bottom surface of the push ring 71, two ends of two protection shells 3 which are deviated from each other are fixedly installed with a slide rod 32, the two slide rods 32 movably penetrate through the bottom die 1, two slide rods 32 are fixedly installed with circular plates 33, the two circular plates 33 are fixedly provided with first springs 34, the two circular plates 33 are respectively and fixedly connected with the outer side end part of the bottom die 1 through the circular plates 33, the two opposite ends of the two protective shells 3 are respectively and fixedly provided with contact blocks 35, the two contact blocks 35 and the push block 6 are both in a trapezoidal shape, the push block 6 is movably inserted between the two contact blocks 35, the two side surfaces of the push block 6 are respectively attached to the surfaces of the two contact blocks 35, the end part of the push block 6 is fixedly provided with a slide block 62, the bottom end of the slide block 62 is fixedly provided with a second spring 63, the slide block 62 is movably inserted in the sliding chute 12, the slide block 62 is fixedly connected with the bottom surface of the inner wall of the sliding chute 12 through the second spring 63, the bottom end of the bottom die 1 is fixedly provided with a shell 15, the shell 15 is fixedly provided with three limiting rods 16, each limiting rod 16 is respectively and movably inserted in the two contact blocks 35 and the push block 6, the first rotating rod 8 is rotatably arranged on the shell 15, a second bevel gear 81 is fixedly arranged at the upper end of the first rotating rod 8, the first bevel gear 52 is meshed with the second bevel gear 81, a first gear 82 is fixedly arranged at the bottom end of the first rotating rod 8, a second rotating rod 83 and a third rotating rod 85 are rotatably arranged at the bottom end of the bottom die 1, a second gear 84 is fixedly arranged on the second rotating rod 83, a third gear 86 is fixedly arranged on the third rotating rod 85, the upper die 2 is fixedly connected with the bottom die 1 through bolts, then raw materials are conveyed into the accommodating groove 11 from an injection molding hole on the upper die 2, after a formed part in the accommodating groove 11 is cooled and shaped, the upper die 2 is detached by a user, then the motor 4 is started, the rotating shaft 5 is rotated, the lug 51 is driven to rotate through the rotation of the rotating shaft 5, when a bulge part of the lug 51 is contacted with the top surface of the sphere 61, an acting force is exerted on the sphere 61, so that the pushing block 6 moves downwards, the two contact blocks 35 can be pushed by the pushing block 6 moving downwards, so that the two contact blocks 35 move originally, the two sliding rods 32 can be driven to move away from each other by the two contact blocks 35 moving away from each other, the two protective shells 3 can be driven to move away from each other by the two sliding rods 32 moving away from each other, so that a gap formed between the two protective shells 3 is enlarged, namely a cavity is enlarged, the two sides of the formed part can be separated from the inner walls of the two protective shells 3, a user can take the formed part out of the accommodating groove 11, the demolding is convenient, the operation is more convenient, when the protruding part of the bump 51 is not contacted with the top surface of the sphere 61, the pushing block 6 is reset by the elastic resetting action of the second spring 63, the two contact blocks 35 are reset by the elastic resetting action of the first spring 34, the two protective shells 3 can be close to each other and move away from each other by the continuous rotation of the rotating shaft 5 and the bump 51, make the formed part in the holding tank 11 break away from with two protecting crust 3 more easily, when need not the drawing of patterns, two protecting crust 3 closure form sealedly, the device structural design is reasonable, it is more convenient to use, in the course of drawing of patterns, the spindle 5 rotates continuously, the spindle 5 rotates and can transfer the first bevel gear 52 to rotate at the same time, because the first bevel gear 52 meshes with the second bevel gear 81, make the first bull stick 8 rotate, can drive the first gear 82, the second bull stick 83, the second gear 84 and the third gear 86 to rotate through the rotation of the first bull stick 8, can drive the third bull stick 85 to rotate through the rotation of the third bull stick 86, because the third bull stick 85 and the ejector pin 7 are connected by screw thread, can drive the ejector pin 7 to move upwards through the rotation of the third bull stick 85, can push up the pushing ring 71 through the ejector pin 7 moves upwards, so that the push ring 71 moves in the receiving groove 11, the formed part in the receiving groove 11 is pushed by the movement of the push ring 71, thereby enabling the formed part to be separated from the accommodating groove 11 more easily, facilitating demoulding, improving the demoulding efficiency of the die assembly, because a certain gap is formed between the two ends of the upper side of the ejector rod 7 and the push ring 71, the push ring 71 can push the formed piece upwards after the two protective shells 3 are separated from the formed piece, when the push ring 71 needs to be reset, because the bottom end of the push ring 71 is fixedly provided with the second magnet block, the two ends of the upper side of the first rotating rod 8 are fixedly provided with the first magnet block, the output shaft of the motor 4 rotates reversely, the push rod 7 can drive the push ring 71 to move upwards, the push ring 71 can be reset, the movement interference is avoided, the stable operation of the shaking structure and the pushing structure is ensured, the die assembly has reasonable structural design and high practicability, the two ends of the protective shell 3 are both fixedly provided with the inserting blocks 31, the two inserting blocks 31 are respectively arranged in the slot 14 in a sliding way, the position of the protective shells 3 is limited, the situation that the two protective shells 3 are deviated is avoided, so that the two protective shells 3 can be sealed in a closed manner, and the stable use of the die assembly is ensured, the first gear 82, the second gear 84 and the third gear 86 are all arranged in the shell 15, the third rotating rod 85 is arranged in the rectangular groove 13, the third rotating rod 85 penetrates through the ejector rod 7, and is connected with the mandril 7 by screw thread, the first gear 82 is meshed with the second gear 84, the third gear 86 is meshed with the second gear 84, the motor 4 is fixedly arranged on the shell 15, the two protective shells 3 are both arc-shaped, the two end parts of the upper side of the mandril 7 are both fixedly provided with a first magnet block, and the bottom end of the push ring 71 is fixedly provided with a second magnet block which is matched with the first magnet block.

When the injection molding device is used, the upper die 2 is fixedly connected with the bottom die 1 through the bolt, then raw materials are conveyed into the accommodating groove 11 from an injection molding hole in the upper die 2, after a molded part in the accommodating groove 11 is cooled and shaped, a user detaches the upper die 2, then the motor 4 is started, the rotating shaft 5 is rotated, the rotating shaft 5 can drive the lug 51 to rotate, when the protruding part of the lug 51 is contacted with the top surface of the sphere 61, acting force can be applied to the sphere 61, the push block 6 can move downwards, thrust can be applied to the two contact blocks 35 by downward movement of the push block 6, the two contact blocks 35 can originally move mutually, the two slide rods 32 can be driven to move away from each other by the mutual away movement of the two contact blocks 35, the two protective shells 3 can be driven to move away from each other by the mutual away movement of the two slide rods 32, a gap formed between the two protective shells 3 can be expanded, namely, the cavity can be expanded, at the two sides of the molded part can be separated from the inner walls of the two protective shells 3, the molded part can be taken out of the accommodating groove 11 by the user, demolding is convenient and convenient to operate;

when the protruding part of the bump 51 is not in contact with the top surface of the ball 61, the push block 6 is reset by the elastic reset action of the second spring 63, the two contact blocks 35 are reset by the elastic reset action of the first spring 34, and the two protective shells 3 can move close to and away from each other through the continuous rotation of the rotating shaft 5 and the bump 51, so that the formed part in the accommodating groove 11 is easier to separate from the two protective shells 3, when the demolding is not needed, the two protective shells 3 are closed to form sealing, and the device has reasonable structural design and is more convenient to use;

in the demolding process, the rotating shaft 5 continuously rotates, the rotating shaft 5 rotates and simultaneously moves the first bevel gear 52 to rotate, the first bevel gear 52 is meshed with the second bevel gear 81, so that the first rotating rod 8 rotates, the first gear 82, the second rotating rod 83, the second gear 84 and the third gear 86 are driven to rotate through the rotation of the first rotating rod 8, the third rotating rod 85 is driven to rotate through the rotation of the third gear 86, the ejector rod 7 is driven to move upwards through the rotation of the third rotating rod 85 due to the threaded connection of the third rotating rod 85 and the ejector rod 7, the ejector rod 7 moves upwards to push the push ring 71 through the upward movement of the ejector rod 7, the push ring 71 moves in the accommodating groove 11, a molded part in the accommodating groove 11 is pushed through the movement of the push ring 71, so that the molded part is more easily separated from the accommodating groove 11, the demolding is more convenient, and the demolding efficiency of the compression molding device is improved;

because there is certain space between the both ends of ejector pin 7 upside and the push ring 71 for two protecting crust 3 break away from the back with the formed part, the push ring 71 just can upwards push up and move the formed part, when the push ring 71 resets when needs, because the bottom fixed mounting of push ring 71 has magnet piece two, the both ends fixed mounting of first bull stick 8 upside has magnet piece one, the reversal of motor 4 output shaft, can make ejector pin 7 drive push ring 71 upwards to remove, can make push ring 71 reset, the motion interference has been avoided, this rocking structure and pushing structure's steady operation has been guaranteed, this die assembly structural design is reasonable, high practicability.

All fixed mounting has the inserted block 31, two through the both ends of protecting crust 3 inserted block 31 slides respectively and sets up in slot 14, has played limiting displacement to the position of protecting crust 3, avoids two protecting crust 3 to take place the condition of offset for two protecting crust 3 can be closed sealed, have guaranteed this die assembly's stable use.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (10)

1. The screw plastic-lined die pressing device comprises a bottom die (1) and an upper die (2) arranged at the upper end of the bottom die (1), and is characterized in that a containing groove (11) is formed in the bottom die (1), a die core is fixedly arranged in the containing groove (11), a sliding groove (12) is formed in the side surface of the bottom die (1), a rectangular groove (13) is formed in the bottom surface of the bottom die (1), slots (14) are formed in the inner wall surfaces of the two sides of the containing groove (11), two protective shells (3) are movably arranged in the containing groove (11), the two protective shells (3) are respectively arranged on the two sides of the die core, inserting blocks (31) are fixedly arranged at the upper end and the lower end of each protective shell (3), each inserting block (31) is movably inserted in the slot (14) respectively, and a forming cavity is formed in each protective shell (3);

the bottom die (1) is provided with a shaking structure, the shaking structure comprises a motor (4), a rotating shaft (5) and a pushing block (6), the rotating shaft (5) is rotatably installed on the bottom die (1), an output shaft of the motor (4) is fixedly connected with the end part of the rotating shaft (5), the rotating shaft (5) is fixedly provided with a convex block (51), the rotating shaft (5) is fixedly provided with a first bevel gear (52), the upper end of the pushing block (6) is fixedly provided with a ball body (61), the pushing block (6) is arranged below the convex block (51), and the bottom surface of the convex block (51) is attached to the top surface of the ball body (61);

be provided with the top on die block (1) and move the structure, the top moves the structure and includes ejector pin (7) and first bull stick (8), movable mounting has ejector ring (71) in holding tank (11), ejector ring (71) activity cup joints on the mold core, ejector pin (7) are the U shape, ejector pin (7) slide to set up in rectangular channel (13), the equal activity in both ends of ejector pin (7) upside is pegged graft in holding tank (11), there is certain space in the upside both ends of rectangular channel (13) and the bottom surface of ejector ring (71).

2. The screw plastic lining die pressing device according to claim 1, wherein two slide bars (32) are fixedly mounted at two ends of the protective shell (3) which deviate from each other, two slide bars (32) penetrate through the bottom die (1) in an all-movable manner, two circular plates (33) are fixedly mounted on the slide bars (32), two first springs (34) are fixedly mounted on the circular plates (33), and two circular plates (33) are fixedly connected with the outer end of the bottom die (1) through the circular plates (33) respectively.

3. The screw plastic-lined die assembly according to claim 2, wherein two opposite ends of the two protective shells (3) are fixedly provided with contact blocks (35), the two contact blocks (35) and the push block (6) are in a trapezoidal shape, the push block (6) is movably inserted between the two contact blocks (35), and the surfaces of two sides of the push block (6) are respectively attached to the surfaces of the two contact blocks (35).

4. The screw plastic-lined die assembly as recited in claim 1, wherein a sliding block (62) is fixedly mounted at an end of the pushing block (6), a second spring (63) is fixedly mounted at a bottom end of the sliding block (62), the sliding block (62) is movably inserted into the sliding chute (12), and the sliding block (62) is fixedly connected with the bottom surface of the inner wall of the sliding chute (12) through the second spring (63).

5. The screw plastic-lined die assembly according to claim 4, wherein the bottom end of the bottom die (1) is fixedly provided with a shell (15), the shell (15) is fixedly provided with three limiting rods (16), and each limiting rod (16) is movably inserted into two contact blocks (35) and the push block (6) respectively.

6. A screw plastic-lined die assembly as claimed in claim 5, wherein the first rotating rod (8) is rotatably mounted on the housing (15), a second bevel gear (81) is fixedly mounted at the upper end of the first rotating rod (8), the first bevel gear (52) is meshed with the second bevel gear (81), and a first gear (82) is fixedly mounted at the bottom end of the first rotating rod (8).

7. The screw plastic-lined die assembly according to claim 6, wherein a second rotating rod (83) and a third rotating rod (85) are rotatably mounted at the bottom end of the bottom die (1), a second gear (84) is fixedly mounted on the second rotating rod (83), a third gear (86) is fixedly mounted on the third rotating rod (85), and the first gear (82), the second gear (84) and the third gear (86) are all arranged in the housing (15).

8. A screw plastic-lined die assembly as claimed in claim 7, wherein the third rotating rod (85) is disposed in the rectangular groove (13), and the third rotating rod (85) penetrates through the top bar (7) and is in threaded connection with the top bar (7).

9. A screw-lined plastic compression molding apparatus as claimed in claim 8, wherein said first gear (82) is engaged with said second gear (84), said third gear (86) is engaged with said second gear (84), and said motor (4) is fixedly mounted to said housing (15).

10. The screw plastic-lined die assembly according to claim 1, wherein the two protective shells (3) are arc-shaped, the first magnet block is fixedly mounted at both ends of the upper side of the ejector rod (7), and the second magnet block matched with the first magnet block is fixedly mounted at the bottom end of the push ring (71).

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