An extrusion molding process for aluminum alloy profiles for new energy vehicle battery packs

Abstract

The present invention discloses a new energy vehicle battery pack aluminum alloy profile extrusion molding process, specifically relates to the field of battery pack molding technology, including a production device used for the new energy vehicle battery pack aluminum alloy profile extrusion molding process, the production device includes a processing table, the top of the processing table is sequentially distributed with a heating chamber, a pushing mechanism, an extrusion die and a cooling bed from front to back, the extrusion die includes a mounting frame, the top of the mounting frame is provided with two first and second dies distributed front and back, the second die and the first die cooperate to form the heated aluminum rod into a new energy vehicle battery pack aluminum alloy profile. The present invention uses a micro suction pump and a nozzle to spray lubricating oil, and at the same time uses a motor, a bevel gear, a rotating rod, two gears and two gear rings to drive two ring plates to rotate together. The ring plates spray lubricating oil while rotating, and the friction of the aluminum rod surface is reduced by the lubricating oil, thereby improving the subsequent extrusion molding effect of the heated aluminum rod.

Description

Technical Field

[0001] This invention relates to the field of battery pack molding technology, and more specifically to an extrusion molding process for aluminum alloy profiles for new energy vehicle battery packs. Background Technology

[0002] New energy vehicles refer to automobiles that use unconventional vehicle fuels as their power source and integrate advanced technologies in vehicle power control and drive, resulting in vehicles with advanced technical principles and new technologies and structures. New energy vehicles include: hybrid electric vehicles (HEVs), battery electric vehicles (BEVs), fuel cell electric vehicles (FCEVs), hydrogen engine vehicles, and natural gas vehicles, etc. The aluminum alloy profiles for new energy vehicle battery packs require extrusion molding processes and are manufactured using extrusion molding equipment.

[0003] For example, in the prior art disclosure CN111014328A, an aluminum alloy profile extrusion forming device is described. This invention uses an annular nozzle with four nozzles inside. After the aluminum alloy profile is extruded, the motor is started, and the rotating motor shaft drives the circulating water pump to start operating. This causes the water in the storage tank to be filtered by the filtration mechanism and then pumped into the annular nozzle. The water is then sprayed by the four nozzles inside the annular nozzle onto the four end faces of the extruded aluminum alloy profile, so that the top, bottom, left, and right end faces of the aluminum alloy profile can all receive effective water spray cooling, effectively improving the cooling effect of the water cooling mechanism in the equipment.

[0004] However, the above-mentioned existing technology still has the following problems when used: when the heated aluminum rod is conveyed into the extrusion die, friction will be generated between the surface of the aluminum rod and the extrusion die. The friction will be converted into resistance, which will affect the flatness of the surface of the aluminum rod after pressure forming. Furthermore, the extruded aluminum alloy profile will fall and deform under the action of gravity. Based on this, the present invention provides an extrusion forming process for aluminum alloy profiles of new energy vehicle battery packs that can reduce the friction of aluminum rods and prevent the deformation of aluminum alloy profiles. Summary of the Invention

[0005] To overcome the aforementioned deficiencies in the prior art, this invention provides an extrusion molding process for aluminum alloy profiles used in new energy vehicle battery packs. A micro-pump and nozzle are used to spray lubricating oil, while a motor, bevel gear, rotating rod, two gears, and two gear rings drive two ring plates to rotate together. As the ring plates rotate, lubricating oil is sprayed, reducing friction on the aluminum rod surface. This improves the subsequent extrusion molding effect of the heated aluminum rod, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an extrusion forming process for aluminum alloy profiles for new energy vehicle battery packs, comprising the following specific steps:

[0007] S1: Select an undamaged aluminum rod and heat it to achieve a plastic deformation state;

[0008] S2: The heated aluminum rod is automatically conveyed to the extrusion die by the pushing mechanism for extrusion molding, so as to become the aluminum alloy profile of the new energy vehicle battery pack;

[0009] S3: The manufactured aluminum alloy profiles for new energy vehicle battery packs are automatically transported to a cooling bed for cooling and temperature reduction.

[0010] S4: The cooled aluminum alloy profiles of the new energy vehicle battery pack are inspected and then straightened to obtain the finished aluminum alloy profiles of the new energy vehicle battery pack.

[0011] The present invention also includes a production device for the extrusion forming process of aluminum alloy profiles for new energy vehicle battery packs. The production device for the process includes a processing table, and the top of the processing table is provided with a heating chamber, a pushing mechanism, an extrusion die and a cooling bed arranged from front to back.

[0012] The extrusion die includes a mounting frame. The top of the mounting frame has two first dies and a second die distributed front to back. The second die and the first die work together to form the heated aluminum rod into an aluminum alloy profile for a new energy vehicle battery pack. The mounting frame has a first guide tube and a second guide tube on its front and rear sides, respectively. The outer walls of the second guide tube and the first guide tube are fitted with ring plates. Both ring plates have cavities inside. The cavity in front of the mounting frame stores lubricating oil, and the cavity in the rear of the mounting frame stores coolant.

[0013] Both ring plates have nozzles fixedly inserted through their inner walls. The nozzles are connected to the interior of the cavity, and the two ring plates are connected by a connecting assembly.

[0014] In a preferred embodiment, a miniature suction pump is fixedly installed inside each of the two cavities. The miniature suction pump is connected to the nozzle and is used to automatically deliver lubricating oil. An inlet pipe is fixedly inserted through the outer wall of each of the two ring plates. A threaded cap is threadedly connected to the inlet pipe to seal the inlet pipe and prevent lubricating oil and coolant from leaking out.

[0015] In a preferred embodiment, the mounting bracket has a through hole at the front, the connecting assembly includes a rotating rod that passes through the through hole, gears are fixedly fitted on the outer walls of both the front and rear sides of the rotating rod, and gear rings are fixedly fitted on the outer walls of both ring plates. The bottom of the two gear rings meshes with the top of the two gears respectively. By using the meshing of the gears and gear rings, it is easy to drive the two ring plates to rotate together, thereby reducing the number of motors used.

[0016] In a preferred embodiment, a motor is fixedly embedded in the top of the perforation, and meshing bevel gears are fixedly sleeved on the output shaft of the motor and the rotating rod. The rotating rod is driven by the motor to rotate, which does not require manual operation by the staff and is very time-saving and labor-saving to use.

[0017] In a preferred embodiment, a guiding component is provided at the rear end of the second guide tube. The guiding component includes a third guide tube. The front end of the third guide tube is inserted into the annular plate on the outer wall of the second guide tube. The third guide tube is provided with multiple guide rollers for guiding the aluminum alloy profile of the new energy vehicle battery pack. Each guide roller is provided with an electric push rod at both ends. The electric push rod is fixedly embedded in the inner wall of the third guide tube and is used to adjust the position of the guide roller.

[0018] In a preferred embodiment, the outer walls of the first guide tube and the second guide tube are both provided with annular grooves, and the inner walls of the two ring plates are both fixed with annular limiting blocks. The annular limiting blocks are slidably disposed in the annular grooves to improve the stability of the ring plates when they rotate. The first guide tube and the second guide tube are both fixed to the mounting bracket by multiple first bolts, which facilitates the disassembly of the first guide tube and the second guide tube for cleaning and replacement.

[0019] In a preferred embodiment, the top of the mounting frame has two slots distributed front and back, and the first mold and the second mold are respectively inserted into the two slots. The top of the mounting frame is provided with a cover plate, and the cover plate is fixed to the mounting frame by a plurality of second bolts, which facilitates the workers to disassemble the cover plate, the first mold and the second mold for cleaning and replacement.

[0020] In a preferred embodiment, the pushing mechanism includes a base, two first hydraulic cylinders are fixedly mounted at the rear end of the base, and the same carrying plate is fixedly mounted at the bottom of the two first hydraulic cylinders for carrying the heated aluminum rod. A second hydraulic cylinder is fixedly mounted through the base for automatically pushing the heated aluminum rod into the first guide tube, thereby reducing the labor required by the workers.

[0021] In a preferred embodiment, a controller for controlling the heating chamber, micro suction pump, motor, electric push rod, first hydraulic cylinder, and second hydraulic cylinder is fixedly provided on one side of the processing table, which facilitates the operation of the device by the staff.

[0022] The technical effects and advantages of this invention are as follows:

[0023] 1. This invention uses a micro-suction pump to draw lubricating oil from the cavity, and sprays the lubricating oil onto the surface of the heated aluminum rod through a nozzle. At the same time, a motor and two bevel gears drive a rotating rod to rotate. The two gears on the rotating rod mesh with two gear rings, thereby driving two ring plates to rotate simultaneously. The ring plates spray lubricating oil while rotating, which reduces the friction on the surface of the aluminum rod, thereby improving the subsequent extrusion molding effect of the heated aluminum rod.

[0024] 2. By loosening the multiple second bolts on the cover plate, the cover plate is removed first. Then, the first mold and the second mold are removed from the two slots in sequence. Different types of first mold and second mold can be replaced to extrude and form aluminum alloy profiles of new energy vehicle battery packs of different shapes.

[0025] 3. Coolant is sprayed through nozzles on the rear ring plate of the mounting bracket. The coolant is sprayed onto the surface of the aluminum alloy profile of the new energy vehicle battery pack, which can improve the cooling effect. In addition, multiple guide rollers in the third guide tube contact the upper, lower, left and right outer walls of the aluminum alloy profile of the new energy vehicle battery pack, which can play a supporting role and prevent the aluminum alloy profile of the new energy vehicle battery pack from bending under the action of gravity. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the production device in this invention;

[0027] Figure 2 This is a side view of the overall structure of the production apparatus in this invention;

[0028] Figure 3 This is a schematic diagram of the extrusion die of the production device in this invention;

[0029] Figure 4 This is a structural diagram of the cover plate, first mold, second mold, and mounting frame of the production device in this invention;

[0030] Figure 5 This is a cross-sectional view of the mounting frame of the production device in this invention;

[0031] Figure 6 This is a cross-sectional view of the annular plate of the production apparatus in this invention;

[0032] Figure 7 This is a rear view of the second guide tube of the production device in this invention;

[0033] Figure 8 This is a bottom view of the first guide tube and the ring plate of the production device in this invention;

[0034] Figure 9 This is a cross-sectional view of the first guide tube and the annular plate of the production device in this invention;

[0035] Figure 10This is a structural diagram of the driving mechanism of the production device in this invention.

[0036] The attached diagram is labeled as follows: 1. Processing table; 2. Heating chamber; 3. Pushing mechanism; 4. Extrusion die; 5. Cooling bed; 6. Connecting assembly; 7. Liquid inlet pipe; 8. Perforation; 9. Guiding assembly; 10. Annular groove; 11. Annular limit block; 12. Slot; 13. Cover plate; 14. Controller;

[0037] 301. Base; 302. First hydraulic cylinder; 303. Carrying plate; 304. Second hydraulic cylinder;

[0038] 401. Mounting bracket; 402. First mold; 403. Second mold; 404. First guide tube; 405. Second guide tube; 406. Ring plate; 407. Cavity; 408. Nozzle; 409. Miniature suction pump;

[0039] 601. Rotating rod; 602. Gear; 603. Gear ring; 604. Motor; 605. Bevel gear;

[0040] 901. Third guide tube; 902. Guide roller; 903. Electric push rod. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Refer to the instruction manual appendix Figure 1-10 This invention provides an extrusion forming process for aluminum alloy profiles for new energy vehicle battery packs, comprising the following specific steps:

[0043] S1: Select an undamaged aluminum rod and heat it to achieve a plastic deformation state;

[0044] S2: The heated aluminum rod is automatically conveyed to the extrusion mold 4 by the pushing mechanism 3 for extrusion molding, so as to become the aluminum alloy profile of the new energy vehicle battery pack.

[0045] S3: The manufactured aluminum alloy profiles for new energy vehicle battery packs are automatically transported to the cooling bed 5 for cooling and temperature reduction.

[0046] S4: The cooled aluminum alloy profiles of the new energy vehicle battery pack are inspected and then straightened to obtain the finished aluminum alloy profiles of the new energy vehicle battery pack.

[0047] Refer to the instruction manual appendix Figure 1-10This invention provides a production apparatus for the extrusion molding process of aluminum alloy profiles for new energy vehicle battery packs. The production apparatus includes a processing table 1. The top of the processing table 1 is arranged from front to back with a heating chamber 2, a pushing mechanism 3, an extrusion die 4, and a cooling bed 5. The extrusion die 4 includes a mounting frame 401. The top of the mounting frame 401 has two first dies 402 and a second die 403 arranged front to back. The second die 403 and the first die 402 cooperate to form the heated aluminum rod into aluminum alloy profiles for new energy vehicle battery packs. The mounting frame 401 has a first guide tube 404 and a second guide tube 405 on its front and rear sides, respectively. The outer walls of the second guide tube 405 and the first guide tube 404 are fitted with ring plates 406, and the two ring plates 406 are provided with cavities 407 inside.

[0048] Next, lubricating oil is stored in the cavity 407 located in front of the mounting bracket 401, and coolant is stored in the cavity 407 located behind the mounting bracket 401. Spray nozzles 408 are fixedly inserted through the inner walls of the two ring plates 406. The spray nozzles 408 are connected to the inside of the cavity 407. A miniature suction pump 409 is fixedly installed inside the two cavities 407. The miniature suction pump 409 is connected to the spray nozzles 408 and is used to automatically deliver lubricating oil. Inlet pipes 7 are fixedly inserted through the outer walls of the two ring plates 406. A threaded cap is threadedly connected to the inlet pipe 7 to seal the inlet pipe 7.

[0049] Two ring plates 406 are connected by a connecting component 6. A through hole 8 is provided at the front of the mounting bracket 401. The connecting component 6 includes a rotating rod 601, which passes through the through hole 8. Gears 602 are fixedly sleeved on the outer walls of both the front and rear sides of the rotating rod 601. Gear rings 603 are fixedly sleeved on the outer walls of both ring plates 406. The bottoms of the two gear rings 603 mesh with the tops of the two gears 602 respectively. A motor 604 is fixedly embedded in the top of the through hole 8. Meshing bevel gears 605 are fixedly sleeved on the output shaft of the motor 604 and on the rotating rod 601 for driving the rotating rod 601 to rotate.

[0050] The pushing mechanism 3 includes a base 301, and two first hydraulic cylinders 302 are fixedly provided at the rear end of the base 301. The same carrying plate 303 is fixedly provided at the bottom of the two first hydraulic cylinders 302 for supporting the heated aluminum rod. A second hydraulic cylinder 304 is fixedly passed through the base 301 for pushing the heated aluminum rod into the first guide tube 404, thereby reducing the labor of the workers.

[0051] Furthermore, a controller 14 is fixedly installed on one side of the processing table 1 to control the heating chamber 2, the micro suction pump 409, the motor 604, the electric push rod 903, the first hydraulic cylinder 302, and the second hydraulic cylinder 304, so as to facilitate the operation of the device by the staff.

[0052] First, the staff inserts the undamaged aluminum rod into the heating chamber 2 and uses the heating chamber 2 to heat the aluminum rod to a plastic deformation state. Then, the heated aluminum rod is automatically moved out of the heating chamber 2 and onto the pushing mechanism 3. The pushing mechanism 3 then pushes the heated aluminum rod into the first guide tube 404.

[0053] Specifically, such as Figure 1 , 2 As shown in Figure 10, two first hydraulic cylinders 302 are used to drive the carrier plate 303 to move upward to the rear of the heating chamber 2. The heated aluminum rods automatically fall onto the carrier plate 303. Then, the carrier plate 303 is controlled to move the heated aluminum rods downward to the front of the first guide tube 404. After that, the second hydraulic cylinder 304 is used to extend and push the heated aluminum rods, thus completing the automatic feeding of aluminum rods. No manual operation is required, making it very convenient to use.

[0054] When the heated aluminum rod is slowly inserted into the first guide tube 404, in order to reduce the friction on the surface of the aluminum rod, such as... Figure 3 , 6 As shown in Figure 8, a miniature suction pump 409 located in front of the mounting frame 401 is used to draw lubricating oil from the cavity 407. The lubricating oil is sprayed onto the surface of the heated aluminum rod through the nozzle 408. At the same time, a motor and two bevel gears 605 are used to drive the rotating rod 601 to rotate. The two gears 602 on the rotating rod 601 mesh with two gear rings 603 respectively, thereby driving the two ring plates 406 to rotate simultaneously. The ring plates 406 spray lubricating oil while rotating, thereby improving the subsequent extrusion molding effect of the heated aluminum rod.

[0055] Refer to the instruction manual appendix Figure 4-5 The mounting bracket 401 has two slots 12 arranged front and back on its top. The first mold 402 and the second mold 403 are respectively inserted into the two slots 12. The mounting bracket 401 is provided with a cover plate 13 on its top. The cover plate 13 is fixed to the mounting bracket 401 by a plurality of second bolts, which facilitates the removal of the cover plate 13 for replacement of the first mold 402 and the second mold 403.

[0056] After the heated aluminum rod passes through the first mold 402 and the second mold 403, the aluminum alloy profile of the new energy vehicle battery pack can be obtained. It is worth noting that the workers can loosen the multiple second bolts on the cover plate 13, remove the cover plate 13 first, and then remove the first mold 402 and the second mold 403 from the two slots 12 in sequence. Different types of first mold 402 and second mold 403 can be replaced to extrude and form aluminum alloy profiles of new energy vehicle battery packs of different shapes.

[0057] Refer to the instruction manual appendix Figure 1 , 24 and 7, the present invention provides an extrusion molding process for aluminum alloy profiles of new energy vehicle battery packs. The rear end of the second guide tube 405 is provided with a guide component 9. The guide component 9 includes a third guide tube 901. The front end of the third guide tube 901 is inserted into the annular plate 406 on the outer wall of the second guide tube 405. The third guide tube 901 is provided with multiple guide rollers 902 for guiding the aluminum alloy profiles of new energy vehicle battery packs. Each guide roller 902 has an electric push rod 903 rotatably mounted at both ends. The electric push rod 903 is fixedly embedded in the inner wall of the third guide tube 901.

[0058] Furthermore, annular grooves 10 are provided on the outer walls of the first guide tube 404 and the second guide tube 405, and annular limiting blocks 11 are fixedly provided on the inner walls of the two ring plates 406. The annular limiting blocks 11 are slidably disposed in the annular grooves 10 to improve the stability of the ring plates 406 when rotating. The first guide tube 404 and the second guide tube 405 are fixed to the mounting bracket 401 by multiple first bolts to facilitate the disassembly of the first guide tube 404 and the second guide tube 405.

[0059] The aluminum alloy profile of the new energy vehicle battery pack, extruded by the first mold 402 and the second mold 403, passes through the ring plate 406 on the second guide tube 405. Coolant is sprayed onto the surface of the aluminum alloy profile by the nozzle 408 on the ring plate 406, thereby improving the cooling effect of the aluminum alloy profile. Multiple guide rollers 902 in the third guide tube 901 contact the upper, lower, left, and right outer walls of the aluminum alloy profile, thereby supporting the aluminum alloy profile and preventing it from bending under gravity.

[0060] In conclusion, 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 principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A process for extruding aluminum alloy profiles for new energy vehicle battery packs, characterized in that: The specific steps include the following: S1: The production equipment used in this process includes a processing table (1), and the top of the processing table (1) is arranged from front to back with a heating chamber (2), a pushing mechanism (3), an extrusion die (4) and a cooling bed (5). The extrusion die (4) includes a mounting frame (401). The mounting frame (401) has two first dies (402) and second dies (403) distributed front and back on the top. The second dies (403) and the first dies (402) work together to form the heated aluminum rod into aluminum alloy profiles for new energy vehicle battery packs. The mounting frame (401) has a first guide tube (404) and a second guide tube (405) on the front and back sides respectively. The outer walls of the second guide tube (405) and the first guide tube (404) are fitted with ring plates (406). The two ring plates (406) are provided with cavities (407). The cavity (407) in front of the mounting frame (401) stores lubricating oil, and the cavity (407) behind the mounting frame (401) stores coolant. Two ring plates (406) are fixedly penetrated by nozzles (408), and the nozzles (408) are connected to the cavity (407). The two ring plates (406) are connected by a connecting component (6). The rear end of the second guide tube (405) is provided with a guide component (9). The guide component (9) includes a third guide tube (901). The front end of the third guide tube (901) is inserted into the ring plate (406) on the outer wall of the second guide tube (405). The third guide tube (901) is provided with multiple guide rollers (902) for guiding the aluminum alloy profile of the new energy vehicle battery pack. Each guide roller (902) is provided with an electric push rod (903) at both ends. The electric push rod (903) is fixedly embedded in the inner wall of the third guide tube (901). Select an undamaged aluminum rod and heat it to make it reach a plastic deformation state. S2: The heated aluminum rod is automatically conveyed to the extrusion mold (4) by the pushing mechanism (3) for extrusion molding, so as to become the aluminum alloy profile of the new energy vehicle battery pack; S3: The aluminum alloy profiles of the new energy vehicle battery packs are automatically transported to the cooling bed (5) for cooling and temperature reduction. S4: The cooled aluminum alloy profiles of the new energy vehicle battery pack are inspected and then straightened to obtain the finished aluminum alloy profiles of the new energy vehicle battery pack.

2. The extrusion forming process for aluminum alloy profiles of new energy vehicle battery packs according to claim 1, characterized in that: A miniature suction pump (409) is fixedly installed inside each of the two cavities (407). The miniature suction pump (409) is connected to the nozzle (408) and is used to automatically deliver lubricating oil. An inlet pipe (7) is fixedly inserted through the outer wall of each of the two ring plates (406). A threaded cap is threadedly connected to the inlet pipe (7) to seal the inlet pipe (7).

3. The extrusion forming process for aluminum alloy profiles of new energy vehicle battery packs according to claim 2, characterized in that: The mounting bracket (401) has a through hole (8) at the front. The connecting component (6) includes a rotating rod (601). The rotating rod (601) passes through the through hole (8). Gears (602) are fixedly sleeved on the outer walls of the front and rear sides of the rotating rod (601). Gear rings (603) are fixedly sleeved on the outer walls of the two ring plates (406). The bottom of the two gear rings (603) meshes with the top of the two gears (602) respectively.

4. The extrusion forming process for aluminum alloy profiles of new energy vehicle battery packs according to claim 3, characterized in that: A motor (604) is fixedly embedded in the top of the perforation (8). A meshing bevel gear (605) is fixedly sleeved on the output shaft of the motor (604) and on the rotating rod (601) to drive the rotating rod (601) to rotate.

5. The extrusion forming process for aluminum alloy profiles of new energy vehicle battery packs according to claim 1, characterized in that: The outer walls of the first guide tube (404) and the second guide tube (405) are provided with annular grooves (10), and the inner walls of the two ring plates (406) are fixed with annular limiting blocks (11). The annular limiting blocks (11) are slidably disposed in the annular grooves (10) to improve the stability of the ring plates (406) when rotating. The first guide tube (404) and the second guide tube (405) are fixed to the mounting bracket (401) by multiple first bolts to facilitate the disassembly of the first guide tube (404) and the second guide tube (405).

6. The extrusion forming process for aluminum alloy profiles of new energy vehicle battery packs according to claim 1, characterized in that: The mounting bracket (401) has two slots (12) distributed front and back on the top. The first mold (402) and the second mold (403) are respectively inserted into the two slots (12). The mounting bracket (401) has a cover plate (13) on the top. The cover plate (13) is fixed to the mounting bracket (401) by a plurality of second bolts.

7. The extrusion forming process for aluminum alloy profiles of new energy vehicle battery packs according to claim 1, characterized in that: The pushing mechanism (3) includes a base (301), and two first hydraulic cylinders (302) are fixedly provided at the rear end of the base (301). The same carrying plate (303) is fixedly provided at the bottom of the two first hydraulic cylinders (302) for carrying the heated aluminum rod. A second hydraulic cylinder (304) is fixedly passed through the base (301) for pushing the heated aluminum rod into the first guide tube (404).

8. The extrusion forming process for aluminum alloy profiles of new energy vehicle battery packs according to claim 7, characterized in that: The processing table (1) is fixedly equipped with a controller (14) for controlling the heating chamber (2), the micro suction pump (409), the motor (604), the electric push rod (903), the first hydraulic cylinder (302), and the second hydraulic cylinder (304).

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