Hydraulic up-and-down drawing device

Abstract

The invention discloses a hydraulic up-down drawing device, and relates to the technical field of wax molds. The device comprises a device body, a pushing mechanism is arranged at the top of the device body, an elastic rod is arranged at the end, away from a hydraulic cylinder, of a moving rod, a push rod is arranged at the end, away from the moving rod, of the elastic rod, a second magnetic conductive seat is arranged at the top of a second electromagnet, and a second spring is connected with a clamping plate through a base. A clamping plate, an elastic rod and a push rod are arranged, the clamping plate is used for being clamped with a mold, after wax injection, a product is formed in a structure jointly formed by the mold and the clamping plate, when a hydraulic cylinder is used, a moving rod is pushed to move downwards, then the elastic rod moves downwards, and when the elastic rod continuously moves out of a limiting barrel, the elastic rod extending out of the bottom of the limiting barrel is not limited any more; therefore, under the action of the elastic restoring force, the push rod is pushed to move towards the two sides, the product on the clamping plate is pushed to move and is separated from the clamping plate, drawing is completed in order, and smooth demolding of the finished product is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of wax molds, and specifically to a hydraulic up-and-down mold lifting device. Background Art

[0002] Wax mold is a commonly used casting method. Investment casting mainly consists of processes such as mold manufacturing, wax mold manufacturing, shell mold manufacturing, and subsequent drying, baking, pouring, and solidification. A wax mold is a pattern used to form the cavity of a casting. To obtain castings with high dimensional accuracy and surface finish, the wax mold itself should first have high dimensional accuracy and surface finish. During the wax mold manufacturing process, manual mold opening and closing is usually used for mold lifting, resulting in a high degree of manual participation and the need to further improve the mold lifting efficiency. Therefore, a hydraulic up-and-down mold lifting device is required.

[0003] For the existing hydraulic up-and-down mold lifting device, when lifting the molded product, only the upper and lower parts of the mold are separated. However, there is usually a certain degree of fastening between the molded product itself and the mold. Directly separating the upper and lower parts of the mold is not conducive to the separation of the molded product from the mold. And after mold lifting, the existing up-and-down mold lifting device requires manual removal of the molded product. Since the product itself has a certain temperature, it is not convenient to directly contact, and the molded product itself also needs to be cooled to ensure product quality. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a hydraulic up-and-down mold lifting device to solve the technical problems that the existing hydraulic up-and-down mold lifting device is not conducive to the separation of the molded product from the mold and does not cool the molded product after mold lifting, which will affect the product quality to a certain extent.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A hydraulic up-and-down mold lifting device, including a device main body. A pushing mechanism is provided at the top of the device main body. The pushing mechanism includes a hydraulic cylinder. A moving rod is provided at the output end of the hydraulic cylinder. An elastic rod is provided at the end of the moving rod away from the hydraulic cylinder. A push rod is provided at the end of the elastic rod away from the moving rod. A first spring is sleeved outside the elastic rod. A limiting cylinder is provided at the bottom of the first spring. A cavity is opened on the device main body. A second electromagnet is provided inside the cavity. A second magnetic guide seat is provided at the top of the second electromagnet. A second spring is provided at the top of the second magnetic guide seat. The second spring is connected with a clamping plate through a base.

[0006] By adopting the above technical solution, the clamping plate is used to engage with the mold. After wax injection, the product is formed in the structure jointly constituted by the mold and the clamping plate. When the hydraulic cylinder is used, it pushes the moving rod to move downward, and then the elastic rod moves downward. When the elastic rod continuously moves out of the limiting cylinder, the elastic rod extending out of the bottom of the limiting cylinder is no longer restricted.

[0007] Further, a fixed sleeve is arranged on the outer side of the moving rod. One end of the fixed sleeve is provided with a rectangular plate. A through hole is formed in the rectangular plate. First electromagnets are arranged on both sides of the rectangular plate. A first magnetic conduction base is arranged at the bottom of the first electromagnets.

[0008] By adopting the above technical solution, when the first electromagnet is electrified, the first magnetic conduction base acts on the mold box made of magnetic conductive metal material, and smoothly adsorbs it on the first magnetic conduction base. With the assistance of the first magnetic conduction base, the clamping plate and the mold box are separated to complete the first step of the mold lifting operation.

[0009] Further, water grooves are arranged on both sides of the second magnetic conduction base. A diversion plate is arranged on the water grooves. Water inlet pipes and water outlet pipes are arranged on the side walls of the water grooves. Solenoid valves are arranged on both the water inlet pipes and the water outlet pipes.

[0010] By adopting the above technical solution, when the push rod moves out of the limiting cylinder due to the elastic rod and is no longer restricted, the elastic rod moves to both sides under the action of the elastic restoring force, and then pushes the push rod to move. Under the push of the push rod, the formed product is smoothly separated from the clamping plate.

[0011] Further, the output end of the hydraulic cylinder is fixedly connected to the moving rod. The moving rod is fixedly connected to the elastic rod. The elastic rod is fixedly connected to the push rod.

[0012] By adopting the above technical solution, when the hydraulic cylinder is in use, it pushes the moving rod to move downward, and then pushes the elastic rod to move downward. When the elastic rod moves out of the limiting cylinder, under the action of the elastic restoring force of the elastic rod, it pushes the push rod fixedly connected to it to move to both sides.

[0013] Further, the first electromagnet is fixedly connected to the rectangular plate. The rectangular plate is fixedly connected to the fixed sleeve. The fixed sleeve is fixedly connected to the device main body.

[0014] By adopting the above technical solution, the fixed connection mode between the fixed sleeve and the device main body facilitates the device main body to provide support for the fixed sleeve. Also, due to the fixed connection mode between the rectangular plate and the fixed sleeve, the rectangular plate is fixed through the fixed sleeve to ensure its stability during use.

[0015] Further, the inner diameter of the fixed sleeve is consistent with the diameter of the through hole. The inner diameter of the limiting cylinder is greater than twice the diameter of the elastic rod.

[0016] By adopting the above technical solution, the moving rod can smoothly enter the through hole of the rectangular plate through the bottom of the fixed sleeve under the action of the hydraulic cylinder, so as to push the elastic rod to move it out of the limiting cylinder.

[0017] Furthermore, there are two sets of the clamping plates, the two sets of clamping plates are arranged in a mirror image, each set of clamping plates has a plurality of them, and the plurality of clamping plates in each set are evenly and equidistantly distributed.

[0018] By adopting the above technical solution, there are two sets of clamping plates, and each set of clamping plates has a plurality of them, which is convenient for the device body to start up at one time, and demold multiple mold boxes and clamping plates, as well as the clamping plates and products simultaneously.

[0019] Furthermore, the flow guide plate is located on one side below the clamping plate, and the number of the flow guide plates is the same as that of the clamping plates.

[0020] By adopting the above technical solution, after demolding, the products falling from the clamping plate smoothly fall onto the flow guide plate on one side below the clamping plate. Since the number of the flow guide plates is the same as that of the clamping plates, the falling finished products can be uniformly received.

[0021] Furthermore, the clamping plate is made of a magnetic-resistant material, the base is made of ferritic stainless steel, and the push rod is made of rubber.

[0022] By adopting the above technical solution, the base made of ferritic stainless steel can move smoothly under the action of the magnetic field force under the cooperation of the second electromagnet and the second magnetic guide seat when the second electromagnet is energized.

[0023] Furthermore, the first electromagnet, the second electromagnet and the solenoid valve are all connected to an external controller, and the water inlet pipe is communicated with an external water source.

[0024] By adopting the above technical solution, under the action of the external controller, the on-off of the first electromagnet and the second electromagnet is controlled, so as to separate the clamping plate from the mold box and separate the clamping plate from the product.

[0025] To sum up, the present invention mainly has the following beneficial effects:

[0026] 1. By setting the clamping plate, the elastic rod and the push rod, the present invention uses the clamping plate to be clamped with the mold. After wax injection, the product is formed in the structure jointly constituted by the mold and the clamping plate. When the hydraulic cylinder is used, the moving rod is pushed to move downward, and then the elastic rod moves downward. When the elastic rod continuously moves out of the limiting cylinder, the elastic rod extending out of the bottom of the limiting cylinder is no longer restricted. Therefore, under the action of its elastic restoring force, the push rod is pushed to move to both sides, pushing the product on the clamping plate to move, so that it is separated from the clamping plate, and the demolding is completed orderly, ensuring the smooth demolding of the finished product;

[0027] 2. By providing a deflector and a water tank, the formed product after mold removal slides down through the deflector into the water tank, and the cold water in the water tank is used to cool the formed product, reducing its temperature. This prevents the temperature of the formed product from directly contacting the operator. At the same time, the cold water in the water tank can assist in further curing the formed product, ensuring product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a three-dimensional structural diagram of the present invention;

[0029] Figure 2 is a top three-dimensional structural diagram of the present invention;

[0030] Figure 3 is a bottom three-dimensional structural diagram of the present invention;

[0031] Figure 4 is a partial cross-sectional structural diagram of the present invention;

[0032] Figure 5 is the present invention Figure 3 an enlarged structural diagram of part A in;

[0033] Figure 6 is the present invention Figure 4 an enlarged structural diagram of part B in.

[0034] In the figure: 1, device main body; 11, cavity; 2, pushing mechanism; 201, hydraulic cylinder; 202, fixed sleeve; 203, rectangular plate; 204, through hole; 205, limiting cylinder; 206, moving rod; 207, elastic rod; 208, first spring; 209, push rod; 3, first electromagnet; 31, first magnetic guide seat; 4, second electromagnet; 41, second magnetic guide seat; 5, second spring; 6, clamping plate; 61, base; 7, deflector; 8, water tank; 81, water inlet pipe; 82, water outlet pipe; 9, solenoid valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0036] The embodiments of the present invention will be described below according to its overall structure.

[0037] A hydraulic up-and-down mold removal device, as Figures 1-6As shown in the figure, it includes a device main body 1. A feeding mechanism 2 is arranged at the top of the device main body 1. The feeding mechanism 2 includes a hydraulic cylinder 201. A moving rod 206 is arranged at the output end of the hydraulic cylinder 201. An elastic rod 207 is arranged at the end of the moving rod 206 away from the hydraulic cylinder 201. A push rod 209 is arranged at the end of the elastic rod 207 away from the moving rod 206. A first spring 208 is sleeved outside the elastic rod 207. A limiting cylinder 205 is arranged at the bottom of the first spring 208. A cavity 11 is opened on the device main body 1. A second electromagnet 4 is arranged inside the cavity 11. A second magnetic conduction seat 41 is arranged at the top of the second electromagnet 4. A second spring 5 is arranged at the top of the second magnetic conduction seat 41. The second spring 5 is connected with a clamping plate 6 through a base 61. The clamping plate 6 is used to engage with the mold. After wax injection, the product is formed in the structure jointly constituted by the mold and the clamping plate 6. When the hydraulic cylinder 201 is used, it pushes the moving rod 206 to move downward, and then makes the elastic rod 207 move downward. When the elastic rod 207 continuously moves out of the limiting cylinder 205, the elastic rod 207 extending out of the bottom of the limiting cylinder 205 is no longer restricted. Therefore, under the action of its elastic restoring force, it pushes the push rod 209 to move to both sides, pushing the product on the clamping plate 6 to move, separating it from the clamping plate 6, and orderly completing mold lifting to ensure the smooth demolding of the finished product.

[0038] Refer to Figure 1 、 2 、3, 4, 5 and 6, a fixed sleeve 202 is arranged outside the moving rod 206. A rectangular plate 203 is arranged at one end of the fixed sleeve 202. A through hole 204 is opened on the rectangular plate 203. First electromagnets 3 are arranged on both sides of the rectangular plate 203. A first magnetic conduction seat 31 is arranged at the bottom of the first electromagnet 3. By energizing the first electromagnets 3, the first magnetic conduction seat 31 acts on the mold box made of magnetic conductive metal material, smoothly adsorbing it on the first magnetic conduction seat 31. With the assistance of the first magnetic conduction seat 31, the clamping plate 6 and the mold box are separated, completing the first step of the mold lifting operation. The rectangular plate 203 is fixed by the fixed sleeve 202, providing effective support for the feeding mechanism 2 and the first electromagnets 3, facilitating the two to play their roles in the subsequent use process.

[0039] Refer to Figure 1 、 2, 3, 4, 5, and 6. Water troughs 8 are provided on both sides of the second magnetic guide seat 41. A flow guide plate 7 is provided on the water trough 8. Water inlet pipes 81 and water outlet pipes 82 are provided on the side walls of the water trough 8. Solenoid valves 9 are provided on both the water inlet pipe 81 and the water outlet pipe 82. When the push rod 209 is no longer restricted after being moved out of the limiting cylinder 205 by the elastic rod 207, the elastic rod 207 moves to both sides under the action of the elastic restoring force, thereby pushing the push rod 209 to move. Under the push of the push rod 209, the formed product is smoothly separated from the clamping plate 6, and under the action of the flow guide plate 7 on one side below it, the product is smoothly guided into the water trough 8 for cooling, assisting in the further solidification of the product, and thus ensuring the quality of the product.

[0040] Refer to Figure 1 , 3 , 4, 5, and 6. The output end of the hydraulic cylinder 201 is fixedly connected to the moving rod 206. The moving rod 206 is fixedly connected to the elastic rod 207. The elastic rod 207 is fixedly connected to the push rod 209. When the hydraulic cylinder 201 is in use, it pushes the moving rod 206 downward, thereby pushing the elastic rod 207 downward. When the elastic rod 207 moves out of the limiting cylinder 205, under the action of the elastic restoring force of the elastic rod 207, it pushes the push rod 209 fixedly connected to it to move to both sides, assisting in separating the finished product on the clamping plate 6 from the clamping plate 6, and orderly completing the mold lifting to ensure the smooth demolding of the finished product.

[0041] Refer to Figure 1 , 2 , 3, 4, 5, and 6. The first electromagnet 3 is fixedly connected to the rectangular plate 203. The rectangular plate 203 is fixedly connected to the fixed sleeve 202. The fixed sleeve 202 is fixedly connected to the device main body 1. The fixed connection method between the fixed sleeve 202 and the device main body 1 facilitates the device main body 1 to provide support for the fixed sleeve 202. Also, due to the fixed connection method between the rectangular plate 203 and the fixed sleeve 202, the rectangular plate 203 is fixed through the fixed sleeve 202 to ensure its stability during use. At the same time, the fixed connection method between the first electromagnet 3 and the rectangular plate 203 enables the first electromagnet 3 to be fixed by the rectangular plate 203, ensuring the stability of the pushing mechanism 2 and the first electromagnet 3 during the operation of the mold lifting device.

[0042] Refer to Figure 1 , 3For 5 and 6, the inner diameter of the fixed sleeve 202 is consistent with the diameter of the through hole 204. The inner diameter of the limiting cylinder 205 is greater than twice the diameter of the elastic rod 207, enabling the moving rod 206 to smoothly pass through the bottom of the fixed sleeve 202 and enter the through hole 204 of the rectangular plate 203 under the action of the hydraulic cylinder 201, so as to push the elastic rod 207 and make it move out of the limiting cylinder 205. At the same time, because the inner diameter of the limiting cylinder 205 is slightly larger than twice the diameter of the elastic rod 207, while the limiting cylinder 205 limits the elastic rod 207, it ensures that the elastic rod 207 can move out of the limiting cylinder 205.

[0043] Refer to Figure 1 、 2 Refer to FIGS. 3 and 4. There are two sets of clamping plates 6, and the two sets of clamping plates 6 are mirror - set. Each set of clamping plates 6 has multiple ones, and the multiple clamping plates 6 in each set are evenly and equidistantly distributed. There are two sets of clamping plates 6, and each set has multiple clamping plates 6, which is convenient for the device main body 1 to simultaneously lift the molds and the clamping plates 6, as well as the clamping plates 6 and the products when starting up at one time, improving the operation efficiency of the device main body 1, thereby increasing the product output to a certain extent, further spreading the operation cost of the device main body 1, and improving economic benefits.

[0044] Refer to Figure 2 and 3 Refer to FIGS. 14 and 15. The guide plate 7 is located on one side below the clamping plate 6, and the number of the guide plates 7 is consistent with that of the clamping plates 6. After mold lifting, the products falling from the clamping plate 6 smoothly fall onto the guide plate 7 on one side below the clamping plate 6. Since the number of the guide plates 7 is the same as that of the clamping plates 6, the falling finished products can be uniformly received. At the same time, due to the high adaptability between the guide plate 7 and the clamping plate 6, it is ensured that the guide plate 7 does not hinder the falling process of the products, and the products smoothly fall into the water tank 8 for cooling, ensuring the production quality of the products.

[0045] Refer to Figure 1 、 2 Refer to FIGS. 3, 4 and 5. The clamping plate 6 is made of a magnetic - resistant material, the base 61 is made of ferritic stainless steel, and the push rod 209 is made of rubber. When the second electromagnet 4 is energized, the ferritic stainless steel base 61 can smoothly move downward under the combined action of the second electromagnet 4 and the second magnetic - conducting seat 41 due to the magnetic force. The magnetic - resistant clamping plate 6 ensures that the base 61 is only affected by the magnetic field generated by the second electromagnet 4, isolating the influence of the first electromagnet 3 on the base 61. The rubber push rod 209 can prevent the push rod 209 from damaging the product when separating the product from the clamping plate 6.

[0046] Refer to Figure 1 、 2, 3, 4, and 5. The first electromagnet 3, the second electromagnet 4, and the solenoid valve 9 are all connected to an external controller. The water inlet pipe 81 is connected to an external water source. Under the action of the external controller, the energization and de-energization of the first electromagnet 3 and the second electromagnet 4 are controlled to facilitate the separation of the clamping plate 6 from the mold box and the separation of the clamping plate 6 from the product. At the same time, under the control of the external controller, the solenoid valve 9 effectively controls the water inlet and outlet process of the water tank 8.

[0047] In this embodiment, the clamping plate 6 is adapted to the guide plate 7, so that after mold removal, the product falling from the clamping plate 6 can smoothly fall onto the guide plate 7. Due to the high degree of adaptation between the guide plate 7 and the clamping plate 6, it is avoided that the guide plate 7 hinders the falling process of the product, ensuring that the product smoothly falls into the water tank 8 for cooling and ensuring the production quality of the product.

[0048] In this embodiment, the clamping plate 6 is engaged with the mold, and the upper surface of the clamping plate 6 and the mold together form a molding structure for the wax mold. When wax is injected into the mold, the product is formed on the clamping plate 6. After the mold is separated from the clamping plate 6, the formed product is exposed to the outside, facilitating the use of the push rod 209 to assist in mold removal of the product.

[0049] In some other embodiments, the clamping plate 6 can be designed in other shapes. Since the shape and size of the wax mold to be cast are different, in order to be compatible with products produced by different manufacturers, the clamping plate 6 can be made into different shapes according to the different needs of customers to ensure that the clamping plate 6 is always adapted to the mold.

[0050] The implementation principle of this embodiment is as follows: First, the mold is fixedly engaged with the clamping plate 6, and wax is injected through the wax injection hole at the top of the mold. After the wax mold is formed, a product to be sold is obtained. Second, through an external controller, the solenoid valve 9 on the water inlet pipe 81 is controlled to open, so that external water source smoothly enters the water tank 8 through the water inlet pipe 81. After a certain period of time, the solenoid valve 9 on the water inlet pipe 81 is controlled by the external controller to close again, completing the water injection of the water tank 8. Then, the external controller controls the first electromagnet 3 and the second electromagnet 4 to be energized simultaneously. Since the base 61 is made of ferritic stainless steel, under the action of the second electromagnet 4, the base 61 moves downward, driving the clamping plate 6 to move downward. During this process, the base 61 squeezes the second spring 5. At the same time, since the mold box is made of a magnetically conductive metal material, under the action of the first electromagnet 3, it moves upward, causing the mold, the formed product, and the clamping plate 6 at its bottom to separate. Subsequently, the external controller controls the second electromagnet 4 to be powered off. The base 61 is no longer affected by the magnetic force and is pushed by the elastic restoring force of the second spring 5 to move the clamping plate 6 upward. Finally, the hydraulic cylinder 201 pushes the moving rod 206 downward, squeezing the first spring 208, and smoothly pushing the elastic rod 207 out of the limiting cylinder 205. The limiting cylinder 205 no longer restricts the elastic rod 207 outside it. The elastic rod 207 smoothly moves the push rod 209 to both sides under the action of the elastic restoring force, enabling the formed product to complete the separation from the clamping plate 6 with the assistance of the push rod 209 and fall into the diversion plate 7 under the action of gravity. After passing through the diversion plate 7, it smoothly enters the water tank 8 for cooling. After the cooling is completed, the operator can fish out the finished product from the water tank 8.

[0051] Although the embodiments of the present invention have been shown and described, this specific embodiment is only an interpretation of the present invention and is not a limitation of the invention. The specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can make modifications, substitutions, and variations without creative contributions to the embodiments as needed, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A hydraulic up-and-down mold lifting device, comprising a device main body (1), characterized in that: At the top of the device main body (1), a material pushing mechanism (2) is provided. The material pushing mechanism (2) includes a hydraulic cylinder (201). At the output end of the hydraulic cylinder (201), a moving rod (206) is provided. At the end of the moving rod (206) away from the hydraulic cylinder (201), an elastic rod (207) is provided. At the end of the elastic rod (207) away from the moving rod (206), a push rod (209) is provided. A first spring (208) is sleeved outside the elastic rod (207). At the bottom of the first spring (208), a limiting cylinder (205) is provided. A cavity (11) is formed in the device main body (1). Inside the cavity (11), a second electromagnet (4) is provided. At the top of the second electromagnet (4), a second magnetic conduction seat (41) is provided. At the top of the second magnetic conduction seat (41), a second spring (5) is provided. The second spring (5) is connected to a clamping plate (6) through a base (61).

2. The hydraulic up-and-down mold lifting device according to claim 1, characterized in that: A fixed sleeve (202) is provided outside the moving rod (206). At one end of the fixed sleeve (202), a rectangular plate (203) is provided. A through hole (204) is formed in the rectangular plate (203). On both sides of the rectangular plate (203), first electromagnets (3) are provided. At the bottom of the first electromagnets (3), first magnetic conduction seats (31) are provided.

3. The hydraulic up-and-down mold lifting device according to claim 2, wherein: Water troughs (8) are provided on both sides of the second magnetic conduction seat (41). A diversion plate (7) is provided on the water troughs (8). On the side wall of the water troughs (8), a water inlet pipe (81) and a water outlet pipe (82) are provided. Solenoid valves (9) are provided on both the water inlet pipe (81) and the water outlet pipe (82).

4. The hydraulic up-and-down mold lifting device according to claim 1, characterized in that: The output end of the hydraulic cylinder (201) is fixedly connected to the moving rod (206). The moving rod (206) is fixedly connected to the elastic rod (207). The elastic rod (207) is fixedly connected to the push rod (209).

5. The hydraulic up-and-down mold lifting device according to claim 2, characterized in that: The first electromagnet (3) is fixedly connected to the rectangular plate (203). The rectangular plate (203) is fixedly connected to the fixed sleeve (202). The fixed sleeve (202) is fixedly connected to the device main body (1).

6. The hydraulic up-and-down mold lifting device according to claim 2, characterized in that: The inner diameter of the fixed sleeve (202) is consistent with the diameter of the through hole (204). The inner diameter of the limiting cylinder (205) is greater than twice the diameter of the elastic rod (207).

7. The hydraulic up and down mold lifting device according to claim 1, wherein: Two groups of clamping plates (6) are provided. The two groups of clamping plates (6) are arranged in a mirror image. Each group of clamping plates (6) has a plurality of them, and the plurality of clamping plates (6) in each group are evenly and equidistantly distributed.

8. The hydraulic up-and-down mold lifting device according to claim 3, wherein: The diversion plate (7) is located on one side below the clamping plate (6), and the number of the diversion plates (7) is the same as that of the clamping plates (6).

9. The hydraulic up-and-down mold lifting device according to claim 1, wherein: The clamping plate (6) is made of a magnetic resistance material. The base (61) is made of ferritic stainless steel. The push rod (209) is made of rubber.

10. The hydraulic up-and-down mold lifting device according to claim 3, wherein: The first electromagnet (3), the second electromagnet (4) and the solenoid valve (9) are all connected to an external controller. The water inlet pipe (81) is communicated with an external water source.

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