Die auxiliary device for extruding magnesium-based composite material

Abstract

The invention discloses a mold auxiliary device for extruding a magnesium-based composite material, relates to an auxiliary device for extruding a mold, and aims to solve the problems that an operator needs to wear high-temperature-resistant gloves to hold a mold with extremely high temperature into the lower part of a hydraulic machine from a resistance furnace during high-temperature hot extrusion of the magnesium-based composite material in the prior art; the device comprises a die lower chassis assembly, a horizontal clamping assembly, a top cover driving assembly, a top cover and a lifting frame assembly, an extrusion die is placed on the lower chassis assembly, the horizontal clamping assembly is installed on the lower chassis assembly and clamps the extrusion die, the top cover is arranged on the top cover driving assembly and covers the extrusion die, the top cover driving assembly is installed on the horizontal clamping assembly, and the lifting frame assembly is installed on the lower chassis assembly of the die. The invention relates to the technical field of composite material preparation.

Description

TECHNICAL FIELD

[0001] The present application relates to an auxiliary device of an extrusion die, in particular to a die auxiliary device for extruding magnesium-based composite materials, and relates to the technical field of composite material preparation. BACKGROUND

[0002] Green and low-carbon are key links to realize high-quality development of mechanical equipment, and are the goal of future manufacturing transformation. Magnesium-based composite materials meet the needs of green development such as high strength, lightweight and corrosion resistance, and are widely used in high-end equipment such as aviation, aerospace and navigation to realize lightweight and stability of structural equipment.

[0003] High-temperature hot extrusion is a traditional method for preparing magnesium-based composite materials. The uniformly mixed magnesium-based composite material powder is placed in an extrusion die, the extrusion die is placed in a resistance furnace for heating and holding, after holding is completed, the die together with the composite material is placed under a hydraulic machine for hot extrusion, usually having two processes of hot pressing and hot forming. The above steps are all manual operations, and the operator needs to wear high-temperature gloves to hold the extremely high-temperature die from the resistance furnace under the hydraulic machine, which threatens the personal safety of the operator. At the same time, the extrusion die is usually designed in a combined manner, and the operator is easy to cause matching errors between parts of the die when moving the die, causing leakage of the powdered magnesium-based composite material. Moreover, due to the low density and small viscosity of magnesium alloy, the flowability is strong at high temperature, and the gap between the dies is caused during the high-temperature hot extrusion process, so that the composite material is easy to extrude into the gap, resulting in a large amount of waste and causing material waste. Therefore, an auxiliary mechanical equipment is needed to solve the above problems. SUMMARY

[0004] The purpose of the present application is to solve the problem that the existing high-temperature hot extrusion of magnesium-based composite materials requires the operator to wear high-temperature gloves to hold the extremely high-temperature die from the resistance furnace under the hydraulic machine, which threatens the personal safety of the operator, and to provide a die auxiliary device for extruding magnesium-based composite materials.

[0005] The technical scheme of the present application to solve the above problems is:

[0006] A die auxiliary device for extruding magnesium-based composite materials, comprising a die lower chassis assembly, a horizontal clamping assembly, a top cover driving assembly, a top cover and a lifting bracket assembly.

[0007] The extrusion die is placed on the lower chassis assembly, the horizontal clamping assembly is installed on the lower chassis assembly and clamps the extrusion die, the top cover is arranged on the top cover driving assembly and covers the extrusion die, the top cover driving assembly is installed on the horizontal clamping assembly, and the lifting bracket assembly is installed on the die lower chassis assembly.

[0008] Further, the horizontal clamping assembly comprises a first gear, a first rack, a connecting ring, two wedge-shaped parts, two clamping plate connecting beams and two arc-shaped clamping plates.

[0009] The two wedge-shaped parts are symmetrically arranged on both sides of the extrusion die and are installed on the lower chassis assembly, and the two wedge-shaped parts are connected through the connecting ring. The wedge-shaped working surface of each wedge-shaped part moves vertically and is matched with the wedge-shaped surface at one end of the clamping plate connecting beam. The other end of the clamping plate connecting beam is fixedly connected with the outer arc surface of the arc-shaped clamping plate. The two arc-shaped clamping plates are oppositely arranged and clamped on the outer circular surface of the extrusion die. The first rack is vertically and fixedly installed on one wedge-shaped part. The first gear is toothedly engaged with the first rack. The first gear is rotatably connected to the lower chassis assembly through the first gear connecting frame.

[0010] Further, the wedge-shaped part comprises a vertical guide frame and a wedge-shaped body.

[0011] The two wedge-shaped bodies are fixedly and connectedly arranged through the connecting ring. Each wedge-shaped body is slidably arranged on the vertical guide frame. Two stop edges are machined on the wedge-shaped working surface of the wedge-shaped body. The vertical guide frame is fixedly installed on the lower chassis assembly. The wedge-shaped surface of the clamping plate connecting beam is slidably arranged on the wedge-shaped working surface between the two stop edges of the wedge-shaped body.

[0012] Further, the horizontal clamping assembly further comprises a first gear rocker and a first threaded tightening piece.

[0013] The first gear rocker is coaxially arranged with the shaft sleeve of the first gear through key connection. The first gear is rotatably connected to the support ring of the first gear connecting frame. The first threaded tightening piece is threadedly connected to the support ring of the first gear connecting frame and is tightened on the shaft sleeve of the first gear.

[0014] Further, the top cover driving assembly comprises a second gear, a rack connecting frame and two second racks.

[0015] The two second racks are symmetrically installed on the rack connecting frame, and each second rack is vertically and slidably arranged on the horizontal clamping assembly. The second gear is toothedly engaged with one second rack. The second gear is rotatably connected to the horizontal clamping assembly through the second gear connecting frame. The second gear drives the second rack and the rack connecting frame to move in the vertical direction.

[0016] Further, the top cover driving assembly further comprises a second gear rocker and a second threaded tightening piece.

[0017] The shaft sleeve of the second gear is coaxially arranged with the second gear through key connection, the second gear is rotationally connected to the support ring of the second gear connecting frame, the second screw is threadedly connected to the support ring of the second gear connecting frame and is in abutment with the shaft sleeve of the second gear, and the bottom end of the second gear connecting frame is fixedly installed on the clamping plate connecting beam.

[0018] Further, the top cover is arranged on the rack connecting frame, and the top cover covers the top opening of the extrusion die.

[0019] Further, the lower die chassis assembly comprises a base, two lower blocking covers and four radial sliding blocks.

[0020] The base is a circular plate body, a central through hole is formed in the base, four sliding block grooves are formed in the side wall of the central through hole in the radial direction, one radial sliding block is arranged in each sliding block groove, the four radial sliding blocks are slidably arranged towards the center of the central through hole, the two lower blocking covers are arranged in the central through hole above and below the radial sliding blocks respectively, and the lifting frame assembly is detachably installed on the lower die chassis assembly.

[0021] Further, the lifting frame assembly comprises a top handle and four curved lifting rods, the bottom end of each curved lifting rod is arranged in the sliding block groove, and the top ends of the four curved lifting rods are fixedly connected with the top handle.

[0022] Further, it further comprises a limiting frame, and the limiting frame comprises a frame body, a first limiting screw and a second limiting screw.

[0023] The frame body is installed on the base, the first limiting screw and the second limiting screw are threadedly installed on the frame body, the bottom end of the first limiting screw is in abutment with the clamping plate connecting beam, and the bottom end of the second limiting screw is in abutment with the rack connecting frame.

[0024] Compared with the prior art, the present application has the following technical effects:

[0025] 1. The lifting frame assembly 5 is connected with the lower die chassis assembly 1, so that the extrusion die placed on the lower die chassis assembly 1 is transferred, the safety of the operator is ensured under high temperature conditions, and the problem of material leakage at the bottom of the die in the traditional moving method is avoided.

[0026] 2. In the present application, the extrusion die is extruded and clamped in the horizontal direction and the vertical direction by the lower die chassis assembly 1, the horizontal clamping assembly 2 and the top cover driving assembly 3, the stability of the extrusion die during work and the cooperation precision between the components of the die are ensured, and the generation of waste material of the composite material during the extrusion process can be greatly reduced.

[0027] 3、The position of the first gear 202 relative to the first rack 204 is fixed in the application, rotating the first gear rocker 201 drives the first gear 202 to rotate and drives the first rack 204 to move up and down, at the same time, the first rack 204 is connected with the wedge-shaped body, the wedge-shaped working surface of the wedge-shaped body is matched with the wedge-shaped surface of the cross beam 206 connected with the clamping plate, the up and down movement of the wedge-shaped body can control the left and right movement of the clamping plate connecting cross beam 206, and the clamping of the extrusion die in the horizontal direction is realized through the limiting of the first limiting screw 602 in the vertical direction, and the two wedge-shaped bodies are fixedly connected through the connecting ring 208, so that the work can be completed by controlling the rotation of the first gear 202.

[0028] 4、The second gear 302 is rotatably connected on the clamping plate connecting cross beam 206 through the second gear connecting frame, the second rack 304 is engaged with the second gear 302, the second gear 302 is rotated to drive the second rack 304 to slide on the sliding groove of the arc-shaped clamping plate 207, the rack connecting frames 305 on the two second racks 304 clamp and limit the extrusion die in the vertical direction, the further clamping and limiting of the extrusion die in the vertical direction is realized through the limiting of the second limiting screw 603 in the vertical direction, the heat loss of the top opening of the extrusion die is blocked by the top cover 4 on the rack connecting frame 305, and a thermocouple insertion hole is arranged on the top cover 4, which can correct the thermocouple and make it inserted into the material inside the extrusion die for temperature monitoring.

[0029] 5、The first gear 202, the first rack 204, the first limiting screw 602, the second gear 302, the second rack 304 and the second limiting screw 603 can be adjusted and adapted according to the different diameters and heights of the extrusion die, so that this design can adapt to extrusion dies of different sizes, and the use range of the auxiliary device is increased.

[0030] 6、The center through hole 104, the four radial sliding blocks 102 and the two lower plugs 103 on the base 101 are arranged, the lower plug 103 can be dropped by sliding the radial sliding block 102, and the work of extruding, demolding and extruding profile of composite materials can be realized by replacing the die gasket with different through holes.

[0031] 7、Each curved lifting rod 501 in the application can be detachably installed in the sliding block sliding groove of the base 101, the top ends of the four curved lifting rods 501 are fixedly connected with the top end handle 502, the top end handle 502 is lifted to move the auxiliary device and the extrusion die, so as to move the extrusion die and increase the safety in use. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the application;

[0033] Figure 2 It is a schematic diagram of the horizontal clamping assembly 2 and the top cover driving assembly 3 arranged on the extrusion die;

[0034] Figure 3 Figure 1 is a schematic view of the lower chassis assembly 1, the bracket assembly 5 and the limiting frame 6;

[0035] Figure 4 Figure 4 is a schematic view of the extrusion die;

[0036] Figure 5 Figure 5 is a schematic view of the lower cover 103 as a circular plate;

[0037] Figure 6 Figure 6 is a schematic view of the lower cover 103 arranged above and below the four radial sliding blocks 102 respectively. DETAILED DESCRIPTION

[0038] In combination Figure 1 In this embodiment, a mold auxiliary device for extruding magnesium-based composite material includes a lower chassis assembly 1, a horizontal clamping assembly 2, a top cover driving assembly 3, a top cover 4 and a bracket assembly 5.

[0039] The extrusion die is placed on the lower chassis assembly 1, the horizontal clamping assembly 2 is installed on the lower chassis assembly 1 and clamps the extrusion die, the top cover 4 is arranged on the top cover driving assembly 3 and covers the extrusion die, the top cover driving assembly 3 is installed on the horizontal clamping assembly 2, and the bracket assembly 5 is installed on the lower chassis assembly 1 of the mold.

[0040] In this embodiment, the bottom end and the side surface of the extrusion die are clamped and defined by the lower chassis assembly 1 and the horizontal clamping assembly 2, the top end of the extrusion die is defined by the top cover driving assembly 3, and the extrusion die is transferred by the bracket assembly 5 to ensure the safety of the operator.

[0041] In combination Figure 1 And Figure 2 As shown in the figure, the horizontal clamping assembly 2 includes a first gear 202, a first rack 204, a connecting ring 208, two wedge-shaped parts 205, two clamping plate connecting beams 206 and two arc-shaped clamping plates 207.

[0042] The two wedge-shaped parts 205 are symmetrically arranged on both sides of the extrusion die and are installed on the lower chassis assembly 1, and the two wedge-shaped parts 205 are connected by the connecting ring 208. The vertically movable wedge-shaped working surface of each wedge-shaped part 205 is arranged in cooperation with the wedge-shaped surface at one end of the clamping plate connecting beam 206, the other end of the clamping plate connecting beam 206 is fixedly connected with the outer arc surface of the arc-shaped clamping plate 207, the two arc-shaped clamping plates 207 are oppositely arranged and clamped on the outer circular surface of the extrusion die, the first rack 204 is vertically fixedly installed on one wedge-shaped part 205, the first gear 202 is arranged in tooth engagement with the first rack 204, and the first gear 202 is rotatably connected by a first gear connecting frame and arranged on the lower chassis assembly 1.

[0043] The first rack 204 is driven to move in the vertical direction by the first gear 202 rotating in this embodiment. Since the first rack 204 is installed on the wedge-shaped part 205, the wedge-shaped working surface of the wedge-shaped part 205 is driven to press the wedge-shaped surface of the clamping plate connecting beam 206 and drive the clamping plate connecting beam 206 to move close to the center of the extrusion die, so as to achieve the extrusion clamping of the extrusion die, and the arc-shaped clamping plate 207 is clamped to the extrusion die through the inner arc surface thereof.

[0044] The wedge-shaped part 205 comprises a vertical guide frame and a wedge-shaped body;

[0045] The two wedge-shaped bodies are fixedly connected by the connecting ring 208, each wedge-shaped body is slidingly arranged on the vertical guide frame, two stop edges are processed on the wedge-shaped working surface of the wedge-shaped body, the vertical guide frame is fixedly installed on the lower chassis assembly 1, and the wedge-shaped surface between the wedge-shaped surface of the clamping plate connecting beam 206 and the two stop edges of the wedge-shaped body is slidingly arranged.

[0046] When the wedge-shaped body slides vertically upward, the other wedge-shaped body is synchronously driven to slide upward by the connecting ring 208, and the wedge-shaped working surface of each wedge-shaped body is slidingly matched with the wedge-shaped surface of the clamping plate connecting beam 206 when each wedge-shaped body slides vertically upward, so as to extrude and drive the clamping plate connecting beam 206 to run in the direction of the extrusion die, and the arc-shaped clamping plate 207 is driven by the clamping plate connecting beam 206 to extrude and tighten the extrusion die.

[0047] The horizontal clamping assembly 2 further comprises a first gear rocker 201 and a first threaded tightening part 203;

[0048] The first gear rocker 201 and the shaft sleeve of the first gear 202 are coaxially arranged by key connection, the first gear 202 is rotationally connected to the supporting ring of the first gear connecting frame, and the first threaded tightening part 203 is threadedly connected to the supporting ring of the first gear connecting frame and is tightened on the shaft sleeve of the first gear 202.

[0049] The first gear rocker 201 and the first gear 202 are synchronously rotated by key connection, so that the first gear rocker 201 drives the first gear 202 to rotate, the first rack 204 is driven to move by the meshing of the first gear 202 and the first rack 204, and the first threaded tightening part 203 is tightened on the shaft sleeve of the first gear 202 when the first rack 204 reaches the required position, so as to prevent the first gear 202 from rotating.

[0050] The top cover driving assembly 3 comprises a second gear 302, a rack connecting frame 305 and two second racks 304;

[0051] Two second gear racks 304 are symmetrically arranged on the rack connecting frame 305, the top horizontal rod of each second gear rack 304 is slidingly inserted into the sleeve of the rack connecting frame 305, and each second gear rack 304 is vertically slidingly arranged on the horizontal clamping assembly 2, the second gear 302 is arranged in meshing with one second gear rack 304, the second gear 302 is rotationally connected to the horizontal clamping assembly 2 through the second gear connecting frame, the second gear 302 drives the second gear rack 304 and the rack connecting frame 305 to move in the vertical direction, thereby achieving the clamping of the extrusion die in the vertical direction. The contact surface of each second gear rack 304 and the rack connecting frame 305 is slidingly arranged, which can ensure that the center positions of the rack connecting frame 305 and the extrusion die are aligned during the movement of the rack.

[0052] The second gear 302 is arranged in meshing with one second gear rack 304, the movement of the second gear rack 304 is driven by the rotation of the second gear 302, and the movement of the rack connecting frame 305 is driven by the movement of the second gear rack 304.

[0053] The top cover driving assembly 3 further comprises a second gear rocker 301 and a second threaded tightening piece 303.

[0054] The second gear rocker 301 is coaxially arranged with the shaft sleeve of the second gear 302 through key connection, the second gear 302 is rotationally connected to the support ring of the second gear connecting frame, the second threaded tightening piece 303 is threadedly connected to the support ring of the second gear connecting frame and is tightened on the shaft sleeve of the second gear 302, and the bottom end of the second gear connecting frame is fixedly installed on the clamping plate connecting beam 206. Each second gear rack 304 is slidingly arranged on the sliding groove of the outer arc surface of an arc-shaped clamping plate 207.

[0055] The second gear rocker 301 and the second gear 302 are synchronously rotated through key connection, so that the second gear rocker 301 drives the rotation of the second gear 302, the movement of the second gear rack 304 is driven through the meshing arrangement of the second gear 302 and the second gear rack 304, and the second threaded tightening piece 303 is tightened on the shaft sleeve of the second gear 302 when the second gear rack 304 reaches the required position, thereby preventing the rotation of the second gear 302.

[0056] The top cover 4 is arranged on the rack connecting frame 305, and the top cover 4 covers the top opening of the extrusion die. The function of the top cover 4 is to prevent the loss of heat inside the extrusion die. Meanwhile, a thermocouple is vertically inserted into the center of the top cover 4, and the temperature inside the extrusion die is monitored through the thermocouple.

[0057] Combining Figure 1 and Figure 3 As shown in the drawings, the lower chassis assembly 1 of the die comprises a base 101, two lower blocking covers 103 and four radial sliding blocks 102.

[0058] The base 101 is a circular plate body, and a center through hole 104 is formed on the base 101. A side wall of the center through hole 104 is radially formed with four sliding block sliding grooves, and each sliding block sliding groove is provided with a radial sliding block 102. The four radial sliding blocks 102 are slidably arranged towards the center of the center through hole 104. Two lower plugs 103 are respectively arranged in the center through hole 104 above and below the radial sliding blocks 102. The bracket assembly 5 is detachably mounted on the lower chassis assembly 1.

[0059] The four radial sliding blocks 102 are slidably arranged in the sliding block sliding grooves to support the upper and lower plugs 103 above the four radial sliding blocks 102. The lower plug 103 is a circular ring body, and the lower plug 103 below the four radial sliding blocks 102 supports the four radial sliding blocks 102 to prevent the radial sliding blocks 102 from being extruded and deformed during the operation of the extrusion die, thereby ensuring that the radial sliding blocks 102 can normally work. The cross section of the lower sliding block sliding groove is a 'T' shaped groove. After the four radial sliding blocks 102 are slid towards the center of the center through hole 104, the four radial sliding blocks 102 support the lower plug 103. After the four radial sliding blocks 102 are slid away from the center of the center through hole 104, the four radial sliding blocks 102 are withdrawn into the sliding block sliding grooves. The upper lower plug 103 is not supported by the radial sliding blocks 102, so that the lower plug 103 passes through the center through hole 104, facilitating the subsequent die demolding work. The bracket assembly 5 includes a top handle 502 and four curved lifting rods 501. The bottom end of each curved lifting rod 501 is arranged in the sliding block sliding groove, and the top end of each curved lifting rod 501 is fixedly connected with the top handle 502. The bottom end of the curved lifting rod 501 is a 'T' shaped structure, which is clamped in the sliding block sliding groove through the 'T' shaped structure of the bottom end of the curved lifting rod 501, facilitating the disassembly and assembly of the bracket assembly 5.

[0060] It also includes a limiting frame 6, which includes a frame body 601, a first limiting screw 602 and a second limiting screw 603.

[0061] The frame body 601 is mounted on the base 101, and the first limiting screw 602 and the second limiting screw 603 are threadedly connected and mounted on the frame body 601. The bottom end of the first limiting screw 602 abuts against the clamping plate connecting beam 206, and the bottom end of the second limiting screw 603 abuts against the rack connecting frame 305.

[0062] The position of the first limiting screw 602 on the frame body 601 is adjusted to limit the upper limit position of the clamping plate connecting beam 206 in the vertical direction, so that the wedge-shaped surface of the clamping plate connecting beam 206 is in contact with the wedge-shaped surface of the wedge-shaped body on the wedge-shaped part 205, and the clamping of the extrusion die in the horizontal direction is further realized through the cooperation of the first gear 202 and the first rack 204.

[0063] The position of the second limiting screw 603 in the frame body 601 is adjusted, the second limiting screw 603 limits the upper limit position of the rack connecting frame 305 in the vertical direction, ensures that the upper cover 4 is covered on the top opening of the extrusion die, and further realizes the clamping of the extrusion die in the vertical direction through the cooperation of the second gear 302 and the second rack 304.

[0064] In combination Figures 3-6 As shown in the embodiment, the extrusion die includes an outer sleeve, a core film sleeve and a die gasket; the die gasket is a circular plate body or a circular ring body, the outer sleeve is sleeved on the core film sleeve, the die gasket is arranged in the outer sleeve below the core film sleeve, and the upper cover 4 is arranged above the outer sleeve.

[0065] When the extrusion die is used for extruding the composite material, the die gasket is a circular plate body, the composite material powder is stored above the die gasket in the core film sleeve, the leakage of the composite material powder can be prevented when the die is moved from the resistance heating furnace to the hydraulic machine, and the lower end surface of the circular plate body is flush with the bottom end surface of the outer sleeve. When the extrusion work is completed, the radial sliding block 102 is withdrawn in the center through hole 104, the upper lower cover 103 and the lower lower cover 103 are dropped, and the die stripping work can be performed at this time. At the same time, if the composite material is used for extruding the plate or the rod, the die gasket with the circular ring body is used to extrude and complete the plate or rod extrusion work through the above operation.

Claims

1. A die assist apparatus for extruding magnesium-based composites, characterized by: It includes mold lower chassis assembly (1), horizontal clamping assembly (2), top cover driving assembly (3), top cover (4) and bracket assembly (5); Extrusion die is placed on the lower chassis assembly (1), the horizontal clamping assembly (2) is installed on the lower chassis assembly (1) and clamps the extrusion die, the top cover (4) is arranged on the top cover driving assembly (3) and covers the extrusion die, the top cover driving assembly (3) is installed on the horizontal clamping assembly (2), and the bracket assembly (5) is installed on the mold lower chassis assembly (1).

2. The die assist apparatus for extruding magnesium matrix composites of claim 1, wherein: The horizontal clamping assembly (2) includes a first gear (202), a first rack (204), a connecting ring (208), two wedge-shaped parts (205), two clamping plate connecting beams (206) and two arc-shaped clamping plates (207); The two wedge-shaped parts (205) are symmetrically arranged on both sides of the extrusion die and are installed on the lower chassis assembly (1), and the two wedge-shaped parts (205) are connected through the connecting ring (208), the wedge-shaped working surface of each wedge-shaped part (205) vertically moving is matched with the wedge-shaped surface of one end of the clamping plate connecting beam (206), the other end of the clamping plate connecting beam (206) is fixedly connected with the outer arc surface of the arc-shaped clamping plate (207), the two arc-shaped clamping plates (207) are oppositely arranged and clamped on the outer circular surface of the extrusion die, the first rack (204) is vertically and fixedly installed on one wedge-shaped part (205), the first gear (202) is toothedly arranged with the first rack (204), and the first gear (202) is rotationally connected and arranged on the lower chassis assembly (1) through the first gear connecting frame.

3. The die assist apparatus for extruding magnesium matrix composites of claim 2, wherein: The wedge-shaped part (205) includes a vertical guide frame and a wedge-shaped body; The two wedge-shaped bodies are fixedly and connectedly arranged through the connecting ring (208), each wedge-shaped body is slidably arranged on the vertical guide frame, two ribs are processed on the wedge-shaped working surface of the wedge-shaped body, the vertical guide frame is fixedly installed on the lower chassis assembly (1), and the wedge-shaped surface between the wedge-shaped surface of the clamping plate connecting beam (206) and the two ribs of the wedge-shaped body is slidably arranged.

4. The die assist apparatus for extruding magnesium matrix composites of claim 2, wherein: The horizontal clamping assembly (2) further includes a first gear rocker (201) and a first threaded jacking part (203); The first gear rocker (201) is coaxially arranged with the shaft sleeve of the first gear (202) through key connection, the first gear (202) is rotationally connected on the support ring of the first gear connecting frame, and the first threaded jacking part (203) is threadedly connected on the support ring of the first gear connecting frame and jacked on the shaft sleeve of the first gear (202).

5. The die assist apparatus for extruding magnesium matrix composites of claim 1, wherein: The top cover driving assembly (3) includes a second gear (302), a rack connecting frame (305) and two second racks (304); The two second racks (304) are symmetrically arranged on the rack connecting frame (305), and each second rack (304) is vertically and slidably arranged on the horizontal clamping assembly (2), the second gear (302) is toothedly arranged with one second rack (304), the second gear (302) is rotationally connected and arranged on the horizontal clamping assembly (2) through the second gear connecting frame, and the second gear (302) drives the second rack (304) and the rack connecting frame (305) to move in the vertical direction.

6. The die assist apparatus for extruding magnesium matrix composites of claim 2 or 5, wherein: The top cover driving assembly (3) further comprises a second gear rocker (301) and a second screw top fastener (303); The second gear rocker (301) is coaxially arranged with the shaft sleeve of the second gear (302) through key connection, the second gear (302) is rotationally connected to the support ring of the second gear connecting frame, the second screw top fastener (303) is threadedly connected to the support ring of the second gear connecting frame and is tightly arranged on the shaft sleeve of the second gear (302), the bottom end of the second gear connecting frame is fixedly installed on the clamping plate connecting beam (206), and each second rack (304) is slidingly arranged on the sliding groove in the outer arc surface of an arc clamping plate (207).

7. The die assist apparatus for extruding magnesium matrix composites of claim 1 or 5, wherein: The top cover (4) is arranged on the rack connecting frame (305), and the top cover (4) covers the top opening of the extrusion die.

8. The die assist apparatus for extruding magnesium matrix composites of claim 1, wherein: The lower bottom plate assembly (1) comprises a base (101), two lower plug covers (103) and four radial sliding blocks (102); The base (101) is a circular plate body, the base (101) is provided with a central through hole (104), the side wall of the central through hole (104) is provided with four sliding block sliding grooves in the radial direction, one radial sliding block (102) is arranged in each sliding block sliding groove, the four radial sliding blocks (102) are slidingly arranged towards the center of the central through hole (104), the two lower plug covers (103) are arranged in the central through hole (104) above and below the radial sliding blocks (102) respectively, and the lifting frame assembly (5) is detachably installed on the lower bottom plate assembly (1).

9. The die assist apparatus for extruding magnesium matrix composites of claim 8, wherein: The lifting frame assembly (5) comprises a top handle (502) and four curved lifting rods (501), the bottom end of each curved lifting rod (501) is arranged in the sliding block sliding groove, and the top ends of the four curved lifting rods (501) are fixedly connected with the top handle (502).

10. The die assist apparatus for extruding magnesium matrix composites of claim 2, 5 or 8, wherein: It further comprises a limiting frame (6), and the limiting frame (6) comprises a frame body (601), a first limiting screw (602) and a second limiting screw (603); The frame body (601) is installed on the base (101), the first limiting screw (602) and the second limiting screw (603) are threadedly connected and installed on the frame body (601), the bottom end of the first limiting screw (602) abuts against the clamping plate connecting beam (206), and the bottom end of the second limiting screw (603) abuts against the rack connecting frame (305).

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