Die of double-acting extruding machine, movable pad moving processing platform and method

Abstract

The invention provides a mold and movable pad moving processing platform of a double-acting extruder, the processing platform comprises a conveying table, a conveying trolley and a lifting platform, the conveying table comprises a base, sliding rails and racks, the base is provided with a group of sliding rails, the inner side of each sliding rail is provided with a rack, and the outer side of each sliding rail is provided with a sliding groove; the conveying trolley comprises a trolley body, a driving assembly and an arm rod, the inner walls of the two sides of the trolley body are slidably connected with the two sliding grooves correspondingly, and the driving assembly is installed on the trolley body. And two arm rods are arranged on the vehicle body close to the lifting platform side. According to the mold and movable pad moving treatment platform and method of the double-acting extruding machine, through cooperative use of the conveying table, the conveying trolley and the lifting platform, the conveying trolley can directly place the mold or the movable pad on or move the mold or the movable pad away from the lifting platform, and the mold or the movable pad can be rapidly moved to an extruding cylinder from a mold changing mechanism for operation; or taking out from the extrusion cylinder for cleaning and die replacement.

Description

Technical Field

[0001] The invention belongs to the technical field of metal pressing and forming, and in particular relates to a die of a double-action extruder, a movable pad moving processing platform and a method. Background Art

[0002] In the field of metal press forming, the double-action extruder is a commonly used metal extrusion equipment. It is usually equipped with an independent perforation system, capable of forward extrusion and reverse extrusion, as well as the production of seamless pipes. During forward extrusion, the flow direction of the metal product is the same as the movement direction of the extrusion shaft. There is relative movement between the extrusion barrel and the billet, generating friction. During the forward extrusion process, active pads are required. Active pads play a filling and sealing role during the extrusion process to ensure the continuity and uniformity of metal flow. However, since the active pads work under high temperature and high pressure, they will gradually wear out, and the active pads must be recycled for each extrusion process, so they need to be replaced regularly to ensure the extrusion quality.

[0003] In reverse extrusion, the flow direction of the metal product is opposite to the movement direction of the extrusion shaft. There is no relative movement between the extrusion cylinder and the billet, and no friction is generated. In reverse extrusion, the mold is recycled for each extrusion process, so the used mold needs to be replaced and cleaned each time.

[0004] The replacement of existing molds and movable pads requires manual use of hook pliers to place them on the ingot feeder, or the mold or movable pad is transported from the mold changing station to the vicinity of the lifting platform for the extrusion operation through a transportation mechanism, and then the mold or movable pad is placed on the lifting platform through automated equipment such as a robotic arm and a hydraulic cylinder. The lifting platform then sends the mold or movable pad to the extrusion operation for mold replacement. The replacement process involves the coordinated work of multiple steps and equipment, which not only tests the operating skills of the staff, but also has high requirements on the performance and reliability of the production equipment, and the mold changing efficiency is low. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention aims to propose a mobile processing platform and method for the mold and movable pad of a double-acting extruder, which solves the problem that the existing replacement mechanism cannot directly transport the mold or movable pad to the lifting platform through a transport cart.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] A mobile processing platform for a mold and a movable pad of a double-action extruder, the processing platform comprising a conveying platform, a conveying trolley and a lifting platform, one end of the conveying platform is a mold changing mechanism, and the other end is a lifting platform, the conveying trolley moves on the conveying platform to transport the mold or the movable pad from the mold changing mechanism to the lifting platform;

[0008] The conveying platform includes a base, a slide rail and a rack. A set of slide rails is installed on the base. A rack for driving the conveying trolley is installed on the inner side of each slide rail. A slide groove for providing a sliding guide for the conveying trolley is provided on the outer side of each slide rail.

[0009] The conveying trolley includes a car body, a driving assembly and an arm. The inner walls on both sides of the car body are slidably connected with two slide grooves respectively. The driving assembly is installed on the car body. The driving assembly moves along the rack to drive the car body to move along the slide groove. Two arm rods for placing molds or movable pads are installed on the car body near the lifting platform side, and the arm rods face the lifting platform.

[0010] Furthermore, four limit switches for detecting the position of the conveying trolley are installed on one side of the base, namely limit switch 1, limit switch 2, limit switch 3 and limit switch 4; contacts for sensing the limit switches are installed on the vehicle body.

[0011] Furthermore, limit blocks for limiting the position of the conveying trolley are respectively installed at both ends of the slide groove.

[0012] Furthermore, wheels for sliding in the slide grooves are respectively installed on the inner walls on both sides of the vehicle body.

[0013] Furthermore, a slot body is provided on the vehicle body, through holes for installing the arm rod are opened on both sides of the slot body, a fixing plate is provided in the slot body above the through hole, a plurality of fixing screw holes are opened on the fixing plate, and screws for fixing the arm rod are installed in the fixing screw holes.

[0014] Furthermore, a plug for adjusting the distance between the two arm rods is installed in the through hole of the slot body.

[0015] Furthermore, the drive assembly includes a motor, a gear and a shaft end baffle, the motor is installed on the vehicle body, the motor output shaft is connected to the gear key, and the gear is meshed with the rack; the end of the motor output shaft is installed with a shaft end baffle for limiting the gear.

[0016] Furthermore, the lifting platform includes a hydraulic cylinder and a mold base, and the mold base for placing the mold or the movable pad is installed on the telescopic rod of the hydraulic cylinder.

[0017] A method for moving a die and a movable pad of a double-action extruder comprises the following steps:

[0018] S1. In the initial state, the conveying trolley is located at the mold changing mechanism, the mold or the movable pad is placed on the two arm rods, and the driving assembly is started to drive the trolley body to move toward the lifting platform. When the two arm rods are located above the lifting platform, the driving assembly stops working;

[0019] S2, after the lifting platform rises to separate the mold or movable pad from the conveying trolley, the driving assembly starts to drive the trolley body back to the initial position, and the lifting platform descends to allow the mold or movable pad to enter the extrusion cylinder for operation;

[0020] S3. When the extrusion operation of the mold or movable pad is completed, the lifting platform rises; the driving component starts to drive the vehicle body to move toward the lifting platform; when the two arms are located below the mold or movable pad, the lifting platform descends to make the mold or movable pad fall onto the two arms, and the driving component starts to drive the vehicle body back to the initial position to process the mold or movable pad.

[0021] Furthermore, in step S2, when the vehicle body moves toward the lifting platform, when the contact on the vehicle body moves to the upper limit switch 2, the motor decelerates; when the contact moves to the upper limit switch 1, the motor stops working;

[0022] When the vehicle body returns to the initial position, when the contact moves to limit switch three, the motor slows down; when the contact moves to limit switch four, the motor stops working.

[0023] Compared with the prior art, the double-action extruder die, movable pad mobile processing platform and method of the present invention have the following advantages:

[0024] (1) The mold and movable pad moving processing platform and method of the double-action extruder described in the present invention, through the coordinated use of the conveying table, the conveying trolley and the lifting platform, and the coordination of the gear and rack of the driving component, the conveying trolley can directly place or move the mold or movable pad on the lifting platform, and quickly realize the mold or movable pad from the mold changing mechanism to the extrusion barrel for operation, or take it out of the extrusion barrel for cleaning and mold changing, thereby reducing the time required for replacing the mold or movable pad.

[0025] (2) The mold and movable pad moving processing platform of the double-action extruder described in the present invention improves the safety of operation. Through the coordinated use of the reduction motor and the limit switch, the conveying trolley can be accurately parked to ensure the accurate placement and removal of the mold or the movable pad; through the setting of the limit switch and the limit block, the movement range of the conveying trolley in the slide can be ensured to prevent it from exceeding the predetermined position, thereby avoiding possible mechanical failures and safety accidents, and realizing the automation of the entire process.

[0026] (3) The mold and movable pad mobile processing platform of the double-action extruder described in the present invention can adjust the distance between the two arms by adjusting the position and thickness of the plug block to adapt to molds or movable pads of different diameters and meet the needs of extruding billets of different diameters of the extruder.

[0027] (4) The mold and movable pad moving processing platform of the double-action extruder described in the present invention can meet the needs of various extrusion processes, and can simultaneously meet the needs of the circulation processing of the movable pad in the forward double-action extrusion process, and can also simultaneously meet the needs of the circulation processing of the movable mold in the reverse extrusion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of the assembly of the movable pad and the arm provided in an embodiment of the present invention;

[0031] Figure 3 A schematic diagram of a conveying trolley transporting a mold provided in an embodiment of the present invention;

[0032] Figure 4 A schematic diagram of the structure of a conveying trolley provided in an embodiment of the present invention;

[0033] Figure 5 A cross-sectional view of the wheel and slide installation provided by an embodiment of the present invention;

[0034] Figure 6 A cross-sectional view of the installation of a motor and a gear provided in an embodiment of the present invention;

[0035] Figure 7 Schematic diagram of the installation of the plug provided in the embodiment of the present invention Figure 1 ;

[0036] Figure 8 Schematic diagram of the installation of the plug provided in the embodiment of the present invention Figure 2 ;

[0037] Fig. 9 Schematic diagram of the installation of the plug provided in the embodiment of the present invention Figure 3 ;

[0038] Fig.10 A schematic diagram of the structure of a lifting platform provided in an embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 1. Conveyor platform; 11. Base; 111. Limit switch 1; 112. Limit switch 2; 113. Limit switch 3; 114. Limit switch 4; 12. Slide rail; 121. Slide groove; 122. Limit block; 13. Rack; 2. Conveyor trolley; 21. Car body; 211. Contact; 212. Wheel; 213. Slot body; 214. Fixing plate; 215. Screw; 216. Block; 22. Drive assembly; 221. Motor; 222. Gear; 223. Shaft end baffle; 23. Arm; 3. Lifting platform; 31. Hydraulic cylinder; 32. Die base; 4. Die; 5. Movable pad. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0044] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0045] like Figures 1 to 10As shown, a double-action extruder mold and movable pad mobile processing platform, the processing platform includes a conveying platform 1, a conveying trolley 2 and a lifting platform 3, one end of the conveying platform 1 is a mold changing mechanism, and the other end is the lifting platform 3, the conveying trolley 2 moves on the conveying platform 1 to transport the mold or movable pad from the mold changing mechanism to the lifting platform 3;

[0046] The conveying platform 1 includes a base 11, a slide rail 12 and a rack 13. A set of slide rails 12 are installed on the base 11 on both sides along the moving direction of the conveying trolley 2. A rack 13 for driving the conveying trolley 2 to move is installed on the inner side of each slide rail 12. A slide groove 121 for providing a sliding guide for the conveying trolley 2 is provided on the outer side of each slide rail 12.

[0047] The conveying trolley 2 includes a car body 21, a driving assembly 22 and an arm 23. The inner walls on both sides of the car body 21 are slidably connected with two slide grooves 121 respectively. The driving assembly 22 is installed on the car body 21. The driving assembly 22 moves along the rack 13 to drive the car body 21 to move along the slide groove 121; two arm rods 23 for placing molds or movable pads are installed on the car body 21 near the lifting platform 3, and the arm rods 23 face the lifting platform 3.

[0048] The mold and movable pad moving processing platform and method of the double-action extruder described in the present invention, through the coordinated use of the conveying table, the conveying trolley and the lifting platform, and the coordination of the driving component and the rack, the conveying trolley can directly place the mold or the movable pad on or move it away from the lifting platform, and quickly realize the mold or the movable pad being moved from the mold changing mechanism to the press for operation, or the mold or the movable pad being taken out of the press for cleaning and mold changing, thereby reducing the time required for replacing the mold or the movable pad.

[0049] In a preferred embodiment of the present invention, four limit switches for detecting the position of the conveying trolley 2 are installed on one side of the base 11, namely limit switch 1 111, limit switch 2 112, limit switch 3 113 and limit switch 4 114; a contact 211 for sensing the limit switch is installed on the vehicle body 21.

[0050] In actual use, the contact 211 moves with the vehicle body 21, and the four limit switches are fixedly mounted on the base 11;

[0051] When the contact 211 moves to the limit switch 112, the limit switch 112 sends a signal, and the motor 221 slows down; when the contact 211 moves to the limit switch 111, the limit switch 111 sends a signal, and the motor 221 stops working. At this time, the two arm rods 23 are located above the lifting platform 3 and are respectively located on the outside of the mold base 32 of the lifting platform 3;

[0052] When the vehicle body 21 returns to the initial position, when the contact 211 moves to the limit switch three 113, the motor 221 decelerates; when the contact 211 moves to the limit switch four 114, the motor 221 stops working.

[0053] In a preferred embodiment of the present invention, limit blocks 122 for limiting the position of the conveying trolley 2 are respectively installed at both ends of the slide groove 121.

[0054] Wheels 212 for sliding in the slide grooves 121 are respectively installed on the inner walls of both sides of the vehicle body 21 .

[0055] In actual use, after the wheel 212 of the vehicle body 21 is installed into the slide groove 121, the limit block 122 is fixed to the slide groove 121 by screws; limit blocks 122 are provided at both ends of the two slide grooves 121, a total of four; the limit blocks 122 play the role of mechanical limit to prevent the limit switch from malfunctioning and causing safety accidents.

[0056] In a preferred embodiment of the present invention, a slot 213 is provided on the vehicle body 21, through holes for mounting the arm 23 are provided on both sides of the slot 213, a fixing plate 214 is provided in the slot 213 above the through holes, a plurality of fixing screw holes are provided on the fixing plate 214, and screws 215 for fixing the arm 23 are installed in the fixing screw holes. A plug 216 for adjusting the distance between the two arm 23 is installed in the through hole of the slot 213.

[0057] In actual use, one end of the arm 23 is installed in the through hole of the groove body 213, and the other end faces the lifting platform 3; after the arm 23 is installed in the through hole of the groove body 213, a suitable plug 216 is installed for limiting, and the screw 215 is tightened against the arm 23 through the fixing screw hole of the fixing plate 214 to prevent the arm 23 from moving.

[0058] like Figure 7-9 As shown, the distance H between the two arms 23 is adjusted by adjusting the position and thickness of the plug 216 to adapt to molds or movable pads of different diameters. In this embodiment, the adjustable range of the distance between the two arms 23 is H1-H3, wherein H2 is any distance within the range of H1-H3, which can adapt to molds or movable pads of different diameters. Generally, there are only 2-3 outer diameter sizes of the mold or movable pad of an extruder, which can be achieved by adjusting the plug 216.

[0059] In a preferred embodiment of the present invention, the driving assembly 22 includes a motor 221, a gear 222 and a shaft end baffle 223, the motor 221 is installed on the vehicle body 21, the output shaft of the motor 221 is keyed to the gear 222, and the gear 222 is meshed with the rack 13; the end of the output shaft of the motor 221 is installed with a shaft end baffle 223 for limiting the gear 222.

[0060] In actual use, the motor 221 adopts a reduction motor with a large transmission torque, and the position detection of the limit switch is used to achieve the precise parking of the conveying trolley 2. The motor 221 is connected to the vehicle body 21 by bolts, and the shaft end baffle 223 is fixed to the output shaft of the motor 221 by screws, and the gear 222 is limited to prevent the gear from axial movement during operation, thereby ensuring the stability of the drive system and the accuracy of the movement of the conveying trolley 2.

[0061] The gear 222 meshes with the rack 13 on the conveyor platform 1, converting the rotational motion of the motor into the linear motion of the conveyor trolley 2 along the rack 13. When the motor 221 is started, it drives the gear 222 to rotate, and the meshing of the gear and the rack enables the conveyor trolley 2 to move along the slide rail 12, achieving precise position control.

[0062] In a preferred embodiment of the present invention, the lifting platform 3 includes a hydraulic cylinder 31 and a mold base 32, and the mold base 32 for placing a mold or a movable pad is installed on the telescopic rod of the hydraulic cylinder 31.

[0063] In actual use, the diameter of the mold 4 or the movable pad 5 is larger than the distance between the two arms 23, and the distance between the two arms 23 is larger than the width of the mold base 32, so as to ensure that the mold base 32 rises and passes through the middle of the two arms 23 to push out the mold 4 or the movable pad 5.

[0064] A method for moving a die and a movable pad of a double-action extruder comprises the following steps:

[0065] S1. In the initial state, the conveying trolley 2 is located at the mold changing mechanism, the mold 4 or the movable pad 5 is placed on the two arm rods 23, and the driving assembly 22 is started to drive the trolley body 21 to move toward the lifting platform 3. When the two arm rods 23 are located above the lifting platform 3, the driving assembly 22 stops working;

[0066] S2, after the lifting platform 3 rises to separate the mold 4 or the movable pad 5 from the conveying trolley 2, the driving assembly 22 starts to drive the trolley body 21 back to the initial position, and the lifting platform 3 descends to allow the mold 4 or the movable pad 5 to enter the extrusion cylinder for operation;

[0067] S3. When the extrusion operation of the mold 4 or the movable pad 5 is completed, the lifting platform 3 rises; the driving component 22 starts to drive the vehicle body 21 to move toward the lifting platform 3; when the two arms 23 are located below the mold 4 or the movable pad 5, the lifting platform 3 descends to make the mold 4 or the movable pad 5 fall onto the two arms 2, and the driving component 22 starts to drive the vehicle body 21 back to the initial position, and the mold 4 or the movable pad 5 is cleaned, the mold is changed, etc.

[0068] In a preferred embodiment of the present invention, in step S2, when the vehicle body 21 moves toward the lifting platform 3, when the contact 211 on the vehicle body 21 moves to the second limit switch 112, the motor 221 decelerates; when the contact 211 moves to the first limit switch 111, the motor 221 stops working, and at this time, the two arm rods 23 are located above the lifting platform 3 and are respectively located on the outside of the mold base 32 of the lifting platform 3;

[0069] When the vehicle body 21 returns to the initial position, when the contact 211 moves to the limit switch three 113, the motor 221 decelerates; when the contact 211 moves to the limit switch four 114, the motor 221 stops working.

[0070] The mold and movable pad mobile processing platform of the double-action extruder described in the present invention requires a movable pad for extrusion during the forward double-action extrusion process, and the movable pad is recycled; when the movable pad is first installed, the movable pad is hoisted to the position of the two arm rods 23 by a crane, and then transported to the lifting platform 3 by a conveying trolley 2, and then transported to the extrusion cylinder by a manipulator for operation.

[0071] During the reverse extrusion process, when the mold is placed for the first time, the mold is hoisted to the position of the two arms 23 by a crane, transported to the lifting platform 3 by the conveying trolley 2, and then transported to the extrusion cylinder through the ingot feeder together with the billet for operation. The mold is circulated, and during the mold circulation process, when the mold is on the two arms 23, the pressure residue around the mold can be manually cleaned. The present invention can simultaneously meet the needs of the first mold placement and the cleaning of the mold in the subsequent extrusion process.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-action extruder die and movable pad moving processing platform and method, characterized in that: The processing platform comprises a conveying platform (1), a conveying trolley (2) and a lifting platform (3); one end of the conveying platform (1) is a mold changing mechanism, and the other end is a lifting platform (3); the conveying trolley (2) moves on the conveying platform (1) to transport the mold (4) or the movable pad (5) from the mold changing mechanism to the lifting platform (3); The conveying platform (1) comprises a base (11), a slide rail (12) and a rack (13); a group of slide rails (12) are installed on the base (11); a rack (13) for driving the conveying trolley (2) to move is installed on the inner side of each slide rail (12); and a slide groove (121) for providing a sliding guide for the conveying trolley (2) is provided on the outer side of each slide rail (12); The conveying trolley (2) comprises a vehicle body (21), a driving assembly (22) and an arm (23); the inner walls on both sides of the vehicle body (21) are respectively slidably connected to two slide grooves (121); the driving assembly (22) is installed on the vehicle body (21); the driving assembly (22) moves along the rack (13) to drive the vehicle body (21) to move along the slide groove (121); two arm rods (23) for placing molds (4) or movable pads (5) are installed on the vehicle body (21) near the lifting platform (3); the arm rods (23) face the lifting platform (3).

2. The die and movable pad moving processing platform of the double-action extruder according to claim 1 is characterized in that: Four limit switches for detecting the position of the conveying trolley (2) are installed on one side of the base (11), namely limit switch 1 (111), limit switch 2 (112), limit switch 3 (113) and limit switch 4 (114); and contacts (211) for sensing the limit switches are installed on the trolley body (21).

3. The die and movable pad moving processing platform of the double-action extruder according to claim 1 is characterized in that: Limit blocks (122) for limiting the position of the conveying trolley (2) are respectively installed at both ends of the slide groove (121).

4. The die and movable pad moving processing platform of the double-action extruder according to claim 1 is characterized in that: Wheels (212) for sliding in the slide groove (121) are respectively installed on the inner walls on both sides of the vehicle body (21).

5. The die and movable pad moving processing platform of the double-action extruder according to claim 1 is characterized in that: The vehicle body (21) is provided with a slot body (213), through holes for installing the arm rod (23) are provided on both sides of the slot body (213), a fixing plate (214) is provided in the slot body (213) above the through holes, a plurality of fixing screw holes are provided on the fixing plate (214), and screws (215) for fixing the arm rod (23) are installed in the fixing screw holes.

6. The die and movable pad moving processing platform of the double-action extruder according to claim 5 is characterized in that: A plug (216) for adjusting the distance between the two arm rods (23) is installed in the through hole of the groove body (213).

7. The die and movable pad moving processing platform of the double-action extruder according to claim 1 is characterized in that: The driving assembly (22) comprises a motor (221), a gear (222) and a shaft end baffle (223); the motor (221) is mounted on the vehicle body (21); the output shaft of the motor (221) is key-connected with the gear (222); the gear (222) is meshed with the rack (13); and the shaft end baffle (223) for limiting the gear (222) is mounted at the end of the output shaft of the motor (221).

8. The die and movable pad moving processing platform of the double-action extruder according to claim 1 is characterized in that: The lifting platform (3) comprises a hydraulic cylinder (31) and a die base (32); the die base (32) for placing a mold (4) or a movable pad (5) is installed on the telescopic rod of the hydraulic cylinder (31).

9. A method for moving a mold and a movable pad of a double-action extruder, comprising the following steps: S1. In the initial state, the transport trolley (2) is located at the mold changing mechanism, the mold (4) or the movable pad (5) is placed on the two arm rods (23), the drive assembly (22) is started to drive the trolley body (21) to move toward the lifting platform (3), and when the two arm rods (23) are located above the lifting platform (3), the drive assembly (22) stops working; S2, after the lifting platform (3) rises to separate the mold (4) or the movable pad (5) from the conveying trolley (2), the driving assembly (22) starts to drive the trolley body (21) back to the initial position, and the lifting platform (3) descends to allow the mold (4) or the movable pad (5) to enter the extrusion cylinder for operation; S3. When the extrusion operation of the mold (4) or the movable pad (5) is completed, the lifting platform (3) rises; the driving component (22) starts to drive the vehicle body (21) to move toward the lifting platform (3); when the two arm rods (23) are located below the mold (4) or the movable pad (5), the lifting platform (3) descends to make the mold (4) or the movable pad (5) fall onto the two arm rods (23), and the driving component (22) starts to drive the vehicle body (21) back to the initial position to process the mold (4) or the movable pad (5).

10. The method for moving the mold and the movable pad of a double-action extruder according to claim 9, characterized in that: In step S2, when the vehicle body (21) moves toward the lifting platform (3), when the contact (211) on the vehicle body (21) moves to the second limit switch (112), the motor (221) decelerates; when the contact (211) moves to the first limit switch (111), the motor (221) stops working; When the vehicle body (21) returns to the initial position, when the contact (211) moves to the limit switch three (113), the motor (221) decelerates; when the contact (211) moves to the limit switch four (114), the motor (221) stops working.

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