Military heavy-duty truck part production mold capable of improving production efficiency

Abstract

This invention discloses a production mold for military heavy-duty truck parts that can improve production efficiency. The mold includes a base, with supports fixedly connected to both the left and right sides of the base's top. Connecting blocks are fixedly connected to the top of the supports, and hydraulic cylinders are bolted to the top of the connecting blocks. Connecting components are mounted on the top of the connecting blocks, and a lower mold is mounted on one side of each connecting component. An upper mold is positioned on top of the lower mold. This invention utilizes a water tank, a transmission component, and a semiconductor cooling chip to achieve elastic contact between the heat-conducting component and various lower molds. The semiconductor cooling chip rapidly reduces water temperature, ensuring efficient heat exchange. Through the combined use of the connecting blocks, connecting components, and hydraulic cylinders, the lower mold can automatically move upwards after cooling with the assistance of a torsion spring. This causes relative sliding between the material and the lower mold due to static inertia, significantly reducing adhesion between the material and the lower mold.

Description

Technical Field

[0001] This invention relates to the field of truck parts processing technology, specifically to a production mold for military heavy-duty truck parts that can improve production efficiency. Background Technology

[0002] Trucks, also known as freight vehicles or cargo trucks, are automobiles primarily used for transporting goods. Sometimes, they also refer to automobiles that can tow other vehicles. They belong to the category of commercial vehicles and are generally classified into heavy-duty and light-duty types based on their weight. In the actual processing and production of truck parts, production molds are used to shape and process some parts.

[0003] In actual processing, due to the different specifications and shapes of the parts, the production molds used also vary. The cooling uniformity of different molds is generally poor. Air cooling has the potential to result in low cooling efficiency, while basic water cooling is not suitable for many types of molds. It also lacks the function of assisting in lifting and resetting, and cannot use static inertia to assist in separating materials, increasing the intensity of manual labor and failing to meet the needs of users.

[0004] Therefore, it is necessary to invent a production mold for military heavy-duty truck parts that can improve production efficiency to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a production mold for military heavy-duty truck parts that can improve production efficiency. It has the advantages of uniform cooling and auxiliary lifting, and solves the problems of production equipment having general cooling uniformity for different molds, lacking auxiliary lifting and resetting functions, and being unable to use static inertia to assist in material separation, thus increasing the intensity of manual labor.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a production mold for military heavy-duty truck parts that can improve production efficiency, comprising a base, brackets fixedly connected to the left and right sides of the top of the base, connecting blocks fixedly connected to the top of the brackets, hydraulic cylinders bolted to the top of the connecting blocks, connecting components mounted on the top of the connecting blocks, a lower mold mounted on one side opposite to the two connecting components, an upper mold mounted on the top of the lower mold, water tanks fixedly connected to the left and right sides of the top of the base, a transmission component mounted on the top of the base, the transmission component including a water pump and a heat conduction component, and a semiconductor cooling chip fixedly embedded on the outside of the water tank.

[0007] Preferably, mounting holes are provided at the four corners of the top of the base, and a reinforcing plate is fixedly connected to the surface of the bracket, with the bottom of the reinforcing plate fixedly connected to the top of the base.

[0008] Preferably, the top of the connecting block is provided with an auxiliary groove, the connecting assembly includes an auxiliary plate, one end of the auxiliary plate is movably connected to the inner wall of the auxiliary groove via a rotating shaft, the other end of the auxiliary plate is movably connected to a movable block via a rotating shaft, and the side of the movable block away from the auxiliary plate is movably connected to an installation block via a rotating shaft, the surface of the installation block is bolted to the connection point of the lower mold.

[0009] Preferably, a torsion spring is installed on the side of the movable block opposite to the auxiliary plate, one end of the torsion spring is fixedly connected to the surface of the movable block, and the other end of the torsion spring is fixedly connected to the surface of the auxiliary plate.

[0010] Preferably, a water injection pipe is connected to the center of the top of the water storage tank, and a sealing cap is threaded onto the top of the surface of the water injection pipe. The number of transmission components is two.

[0011] Preferably, positioning sleeves are fixedly connected to the four corners of the bottom of the lower mold, and positioning rods are slidably arranged in the inner cavity of the positioning sleeves, with the bottom of the positioning rods fixedly connected to the top of the base.

[0012] Preferably, the bottom of the water pump is fixedly connected to the top of the base by bolts, the water inlet end of the water pump is connected to an inlet pipe, the water outlet end of the water pump is connected to a coil, the other end of the coil is connected to a return pipe, the end of the inlet pipe away from the water pump and the end of the return pipe away from the coil are both connected to the inner cavity of the water storage tank, and the heat conduction component is installed on the surface of the coil.

[0013] Preferably, the heat-conducting component includes a heat-conducting sleeve, a connecting sleeve is fixedly connected to the inner side of the heat-conducting sleeve, a heat-conducting spring is fixedly connected to the inner wall of the connecting sleeve, a sliding rod is fixedly connected to the other end of the heat-conducting spring, and an elastic silicone block is fixedly connected to the end of the sliding rod away from the heat-conducting spring. The surface of the elastic silicone block slides in contact with the surface of the lower mold.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. This invention uses a water storage tank, a transmission component and a semiconductor cooling chip in combination, which has the advantage of uniform cooling. It can make elastic contact with various lower molds using heat-conducting components to increase the heat exchange contact area and improve heat exchange uniformity. In addition, the presence of the semiconductor cooling chip can quickly reduce the water temperature and ensure heat exchange efficiency.

[0016] 2. This invention uses a connecting block, connecting components and a hydraulic cylinder in combination, which has the advantage of auxiliary lifting. With the assistance of a torsion spring, the lower mold can be automatically moved upward after cooling, so that the material can slide relative to the lower mold due to static inertia, which greatly reduces the adhesion between the material and the lower mold and facilitates subsequent manual material handling. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a three-dimensional cross-sectional view of the mold of the present invention;

[0019] Figure 3 This is a three-dimensional schematic diagram of a partial structure of the present invention;

[0020] Figure 4 This is a three-dimensional schematic diagram of the transmission components of the present invention.

[0021] Figure 5 This is a cross-sectional perspective view of the heat-conducting component of the present invention;

[0022] Figure 6 This is a sectional perspective view of the connecting block of the present invention.

[0023] In the diagram: 1. Base, 2. Water tank, 3. Transmission component, 4. Positioning sleeve, 5. Positioning rod, 6. Mounting hole, 7. Semiconductor cooling chip, 8. Connecting block, 9. Connecting component, 91. Mounting block, 92. Movable block, 93. Torsion spring, 94. Auxiliary plate, 10. Lower mold, 11. Upper mold, 12. Reinforcing plate, 13. Water injection pipe, 14. Water inlet pipe, 15. Water pump, 16. Return pipe, 17. Heat conduction component, 171. Elastic silicone block, 172. Heat conduction sleeve, 173. Connecting sleeve, 174. Slide rod, 175. Heat conduction spring, 18. Coil, 19. Auxiliary groove, 20. Hydraulic cylinder, 21. Bracket. Detailed Implementation

[0024] Please see Figures 1-6 A production mold for military heavy-duty truck parts that can improve production efficiency includes a base 1, brackets 21 fixedly connected to the left and right sides of the top of the base 1, connecting blocks 8 fixedly connected to the top of the brackets 21, hydraulic cylinders 20 bolted to the top of the connecting blocks 8, connecting components 9 installed on the top of the connecting blocks 8, a lower mold 10 installed on one side opposite to the two connecting components 9, an upper mold 11 set on the top of the lower mold 10, water tanks 2 fixedly connected to the left and right sides of the top of the base 1, a transmission component 3 installed on the top of the base 1, the transmission component 3 including a water pump 15 and a heat conduction component 17, and a semiconductor cooling chip 7 fixedly embedded on the outside of the water tank 2.

[0025] Mounting holes 6 are provided at the four corners of the top of the base 1. A reinforcing plate 12 is fixedly connected to the surface of the bracket 21, and the bottom of the reinforcing plate 12 is fixedly connected to the top of the base 1.

[0026] The top of the connecting block 8 is provided with an auxiliary groove 19. The connecting assembly 9 includes an auxiliary plate 94. One end of the auxiliary plate 94 is movably connected to the inner wall of the auxiliary groove 19 via a rotating shaft. The other end of the auxiliary plate 94 is movably connected to a movable block 92 via a rotating shaft. The side of the movable block 92 away from the auxiliary plate 94 is movably connected to an installation block 91 via a rotating shaft. The surface of the installation block 91 is bolted to the connection point of the lower mold 10.

[0027] A torsion spring 93 is installed on the side of the movable block 92 opposite to the auxiliary plate 94. One end of the torsion spring 93 is fixedly connected to the surface of the movable block 92, and the other end of the torsion spring 93 is fixedly connected to the surface of the auxiliary plate 94.

[0028] A water injection pipe 13 is connected to the center of the top of the water storage tank 2. A sealing cap is threaded on the top of the surface of the water injection pipe 13. There are two transmission components 3.

[0029] Positioning sleeves 4 are fixedly connected to the four corners of the bottom of the lower mold 10. Positioning rods 5 are slidably arranged in the inner cavity of the positioning sleeves 4. The bottom of the positioning rods 5 is fixedly connected to the top of the base 1.

[0030] The bottom of the water pump 15 is fixedly connected to the top of the base 1 by bolts. The water inlet end of the water pump 15 is connected to the water inlet pipe 14, and the water outlet end of the water pump 15 is connected to the coil 18. The other end of the coil 18 is connected to the return pipe 16. The end of the water inlet pipe 14 away from the water pump 15 and the end of the return pipe 16 away from the coil 18 are both connected to the inner cavity of the water storage tank 2. The heat conduction component 17 is installed on the surface of the coil 18.

[0031] The heat-conducting component 17 includes a heat-conducting sleeve 172, a connecting sleeve 173 is fixedly connected to the inner side of the heat-conducting sleeve 172, a heat-conducting spring 175 is fixedly connected to the inner wall of the connecting sleeve 173, a slide rod 174 is fixedly connected to the other end of the heat-conducting spring 175, and an elastic silicone block 171 is fixedly connected to the end of the slide rod 174 away from the heat-conducting spring 175. The surface of the elastic silicone block 171 slides in contact with the surface of the lower mold 10.

[0032] The connecting sleeve 173, the heat-conducting sleeve 172 and the slide rod 174 are all made of aluminum alloy. The surface of the heat-conducting sleeve 172 extends into the inner cavity of the coil 18. There are several heat-conducting components 17.

[0033] By setting up water storage tank 2, an appropriate amount of circulating water can be stored to meet the needs of heat and cold exchange;

[0034] By setting the positioning sleeve 4 and the positioning rod 5, the positioning and guiding functions can be achieved, which greatly improves the stability of the vertical displacement of the lower mold 10.

[0035] By providing mounting holes 6, the base 1 can be stably installed in a suitable position with the assistance of external bolts;

[0036] By setting the connecting block 8, the space requirements for opening the auxiliary groove 19 and the fixed installation requirements for the hydraulic cylinder 20 can be met.

[0037] By setting the reinforcing plate 12, the bracket 21 can be reinforced and connected to ensure the stability of the connecting block 8.

[0038] By setting up the inlet pipe 14, return pipe 16 and coil 18, the cooling water can be continuously circulated.

[0039] By setting a thermally conductive spring 175, the slide bar 174 can be elastically connected so that the elastic silicone block 171 remains in elastic contact with the lower mold 10.

[0040] By setting the elastic silicone block 171, it has the advantage of elastic deformation, which can increase the contact area with the lower mold 10 under close contact condition and improve heat exchange efficiency.

[0041] By setting the connecting sleeve 173 and the slide rod 174, an auxiliary guiding function can be played to ensure the displacement stability of the slide rod 174;

[0042] By setting the torsion spring 93, the movable block 92 and the auxiliary plate 94 can be elastically connected, thereby enabling the movable block 92 and the auxiliary plate 94 to have the characteristic of automatic reset.

[0043] By setting the auxiliary groove 19, the space for storing and rotating the auxiliary plate 94 can be met. By setting the hydraulic cylinder 20, the auxiliary plate 94 can be pressed against when it is extended, so that the auxiliary plate 94 can be lifted upward.

[0044] Example 1:

[0045] A production mold for military heavy-duty truck parts that can improve production efficiency includes a base 1. The left and right sides of the top of the base 1 are fixedly connected to the brackets 21. The top of the brackets 21 is fixedly connected to the connecting blocks 21. The top of the connecting blocks 8 is bolted with a hydraulic cylinder 20. The top of the connecting blocks 8 is installed with a connecting component 9. The lower mold 10 is installed on the opposite side of the two connecting components 9. The top of the lower mold 10 is provided with an upper mold 11. The left and right sides of the top of the base 1 are fixedly connected to the water tanks 2. The top of the base 1 is installed with a transmission component 3. The transmission component 3 includes a water pump 15 and a heat conduction component 17. The outside of the water tank 2 is fixedly embedded with a semiconductor cooling chip 7.

[0046] The top of the connecting block 8 is provided with an auxiliary groove 19. The connecting assembly 9 includes an auxiliary plate 94. One end of the auxiliary plate 94 is movably connected to the inner wall of the auxiliary groove 19 via a rotating shaft. The other end of the auxiliary plate 94 is movably connected to a movable block 92 via a rotating shaft. The side of the movable block 92 away from the auxiliary plate 94 is movably connected to an installation block 91 via a rotating shaft. The surface of the installation block 91 is bolted to the connection point of the lower mold 10.

[0047] A torsion spring 93 is installed on the side of the movable block 92 opposite to the auxiliary plate 94. One end of the torsion spring 93 is fixedly connected to the surface of the movable block 92, and the other end of the torsion spring 93 is fixedly connected to the surface of the auxiliary plate 94.

[0048] A water injection pipe 13 is connected to the center of the top of the water storage tank 2. A sealing cap is threaded on the top of the surface of the water injection pipe 13. There are two transmission components 3.

[0049] The bottom of the water pump 15 is fixedly connected to the top of the base 1 by bolts. The water inlet end of the water pump 15 is connected to the water inlet pipe 14, and the water outlet end of the water pump 15 is connected to the coil 18. The other end of the coil 18 is connected to the return pipe 16. The end of the water inlet pipe 14 away from the water pump 15 and the end of the return pipe 16 away from the coil 18 are both connected to the inner cavity of the water storage tank 2. The heat conduction component 17 is installed on the surface of the coil 18.

[0050] The heat-conducting component 17 includes a heat-conducting sleeve 172, a connecting sleeve 173 is fixedly connected to the inner side of the heat-conducting sleeve 172, a heat-conducting spring 175 is fixedly connected to the inner wall of the connecting sleeve 173, a slide rod 174 is fixedly connected to the other end of the heat-conducting spring 175, and an elastic silicone block 171 is fixedly connected to the end of the slide rod 174 away from the heat-conducting spring 175. The surface of the elastic silicone block 171 slides in contact with the surface of the lower mold 10.

[0051] The connecting sleeve 173, the heat-conducting sleeve 172 and the slide rod 174 are all made of aluminum alloy. The surface of the heat-conducting sleeve 172 extends into the inner cavity of the coil 18. There are several heat-conducting components 17.

[0052] By setting up the water storage tank 2, an appropriate amount of circulating water can be stored to meet the needs of heat exchange; by setting up the connecting block 8, the space requirements for opening the auxiliary tank 19 and the fixed installation requirements for the hydraulic cylinder 20 can be met.

[0053] By setting up the inlet pipe 14, return pipe 16 and coil 18, the cooling water can be continuously circulated.

[0054] By setting a thermally conductive spring 175, the slide bar 174 can be elastically connected so that the elastic silicone block 171 remains in elastic contact with the lower mold 10.

[0055] By setting the elastic silicone block 171, it has the advantage of elastic deformation, which can increase the contact area with the lower mold 10 under close contact condition and improve heat exchange efficiency.

[0056] By setting the connecting sleeve 173 and the slide rod 174, an auxiliary guiding function can be played to ensure the displacement stability of the slide rod 174;

[0057] By setting the torsion spring 93, the movable block 92 and the auxiliary plate 94 can be elastically connected, thereby enabling the movable block 92 and the auxiliary plate 94 to have the characteristic of automatic reset.

[0058] By setting the auxiliary groove 19, the space for storing and rotating the auxiliary plate 94 can be met. By setting the hydraulic cylinder 20, the auxiliary plate 94 can be pressed against when it is extended, so that the auxiliary plate 94 can be lifted upward.

[0059] A water pump 15 is a machine that transports or pressurizes liquids. It transfers the mechanical energy of a prime mover or other external energy to the liquid, increasing the liquid's energy. It is mainly used to transport liquids including water, oil, acid and alkali solutions, emulsions, suspensions, and liquid metals. Technical parameters include flow rate, suction head, discharge head, shaft power, water power, and efficiency. Based on different working principles, pumps can be classified into positive displacement pumps and centrifugal pumps. Positive displacement pumps utilize changes in the volume of their working chamber to transfer energy; centrifugal pumps utilize the interaction between rotating blades and water to transfer energy, and include centrifugal pumps, axial flow pumps, and mixed flow pumps.

[0060] Thermoelectric cooling chip 7, also known as a thermoelectric cooling chip, is a type of heat pump. Its advantages include the absence of moving parts, making it suitable for applications where space is limited, reliability is critical, and refrigerant contamination is undesirable. Utilizing the Peltier effect of semiconductor materials, when direct current passes through a coupler composed of two different semiconductor materials connected in series, heat is absorbed and released at the two ends of the coupler, achieving cooling. It is a cooling technology that generates negative thermal resistance, characterized by the absence of moving parts and relatively high reliability.

[0061] The hydraulic cylinder 20 is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or oscillating motion). It has a simple structure and reliable operation. When used to achieve reciprocating motion, a speed reduction device can be eliminated, and there is no transmission backlash, resulting in smooth movement. Therefore, it is widely used in the hydraulic systems of various machines. The output force of the hydraulic cylinder 20 is proportional to the effective area of ​​the piston and the pressure difference between its two sides. The hydraulic cylinder 20 is basically composed of a cylinder barrel and cylinder head, a piston and piston rod, a sealing device, a buffer device, and an exhaust device.

[0062] A method for using a production mold for military heavy-duty truck parts that can improve production efficiency includes the following steps:

[0063] A: All components are in the initial installation state. The top of the upper mold 11 is fixedly connected to the external lifting hydraulic press. After the material is injected into the lower mold 10, the upper mold 11 is moved down to align with the lower mold 10, and the lower mold 10 moves down synchronously, which drives the mounting block 91 and the movable block 92 to move down synchronously. The angle between the movable block 92 and the auxiliary plate 94 and the angle between the auxiliary plate 94 and the connecting block 8 are changed, which finally makes the bottom of the auxiliary plate 94 fit against the inner wall of the auxiliary groove 19. At this time, the torsion spring 93 is in a tightened state.

[0064] B: During the downward movement of the lower mold 10, the slide rod 174 is compressed and undergoes elastic deformation, causing it to retract into the connecting sleeve 173. The thermal spring 175 is compressed, and at this time, the contact area between the elastic silicone block 171 and the lower mold 10 is no longer a "point" but a "surface," effectively increasing the heat exchange contact area. When cooling is required, the water pump 15 and the semiconductor cooling chip 7 are controlled to work. The operation of the water pump 15 causes the water in the water storage tank 2 to pass through the inlet pipe 14, the coil 18, and the return pipe 16 in sequence, and finally enter the water storage tank on the other side. Inside the tank 2, the water circulates, and the operation of the semiconductor cooling chip 7 effectively reduces the water temperature in the water tank 2 to maintain the heat exchange temperature difference and ensure heat exchange efficiency. The cold water flows and contacts the heat-conducting sleeve 172. Since the heat-conducting sleeve 172, the connecting sleeve 173 and the heat-conducting spring 175 are all made of heat-conducting materials, the high temperature on the surface of the lower mold 10 is conducted to the cold water in the coil 18 by the slide rod 174. In addition, multiple heat-conducting components 17 can be installed according to actual needs to perform uniform heat exchange on the lower mold 10 and achieve uniform water cooling. This method is suitable for lower molds 10 with irregular shapes.

[0065] C: After efficient and uniform cooling is completed, the external lifting hydraulic press rises and drives the upper mold 11 to separate from the lower mold 10. At this time, under the elastic support of the torsion spring 93, the angle between the movable block 92 and the auxiliary plate 94 is automatically reset, so that the lower mold 10 automatically moves up one end distance. Under the action of static inertia, the contact tightness between the molding material and the lower mold 10 can be reduced, thereby reducing the labor intensity of manual separation. This is worth promoting. In the actual processing, if the material is too heavy and the torsion spring 93 cannot be elastically reset, the hydraulic cylinder 20 can be controlled to extend quickly, contact the bottom of the auxiliary plate 94 and lift the auxiliary plate 94.

[0066] In summary, this military heavy-duty truck parts production mold, which can improve production efficiency, solves the problems of the production equipment having general cooling uniformity for different molds, lacking auxiliary lifting and resetting functions, and being unable to use static inertia to assist in material separation, thus increasing the intensity of manual labor, by setting up a water storage tank 2, a semiconductor cooling chip 7, a connecting block 8, a connecting component 9, a water injection pipe 13, a water inlet pipe 14, a water pump 15, a return pipe 16, a heat conduction component 17, a coil 18, and a hydraulic cylinder 20.

Claims

1. A production mold for military heavy-duty truck parts that can improve production efficiency, comprising a base (1), characterized in that: The base (1) has brackets (21) fixedly connected to the left and right sides of the top. The brackets (21) have connecting blocks (8) fixedly connected to the top. The connecting blocks (8) have hydraulic cylinders (20) bolted to the top. The connecting blocks (8) have connecting components (9) installed on the top. The two connecting components (9) have lower molds (10) installed on opposite sides. The lower molds (10) have upper molds (11) installed on the top. The base (1) has water tanks (2) fixedly connected to the left and right sides of the top. The base (1) has a transmission component (3) installed on the top. The transmission component (3) includes a water pump (15) and a heat conduction component (17). The water tank (2) has a semiconductor cooling chip (7) fixedly embedded on the outside. The top of the connecting block (8) is provided with an auxiliary groove (19). The connecting assembly (9) includes an auxiliary plate (94). One end of the auxiliary plate (94) is movably connected to the inner wall of the auxiliary groove (19) via a rotating shaft. The other end of the auxiliary plate (94) is movably connected to a movable block (92) via a rotating shaft. The side of the movable block (92) away from the auxiliary plate (94) is movably connected to an installation block (91) via a rotating shaft. The surface of the installation block (91) is bolted to the connection point of the lower mold (10). A torsion spring (93) is installed on the side of the movable block (92) opposite to the auxiliary plate (94). One end of the torsion spring (93) is fixedly connected to the surface of the movable block (92), and the other end of the torsion spring (93) is fixedly connected to the surface of the auxiliary plate (94). The bottom of the water pump (15) is fixedly connected to the top of the base (1) by bolts. The water inlet end of the water pump (15) is connected to the water inlet pipe (14), and the water outlet end of the water pump (15) is connected to the coil (18). The other end of the coil (18) is connected to the return pipe (16). The end of the water inlet pipe (14) away from the water pump (15) and the end of the return pipe (16) away from the coil (18) are both connected to the inner cavity of the water storage tank (2). The heat conduction component (17) is installed on the surface of the coil (18). The heat-conducting component (17) includes a heat-conducting sleeve (172), a connecting sleeve (173) is fixedly connected to the inner side of the heat-conducting sleeve (172), a heat-conducting spring (175) is fixedly connected to the inner wall of the connecting sleeve (173), a slide rod (174) is fixedly connected to the other end of the heat-conducting spring (175), an elastic silicone block (171) is fixedly connected to the end of the slide rod (174) away from the heat-conducting spring (175), and the surface of the elastic silicone block (171) slides in contact with the surface of the lower mold (10).

2. The military heavy-duty truck parts production mold according to claim 1, characterized in that: The base (1) has mounting holes (6) at the four corners of its top. The surface of the bracket (21) is fixedly connected to a reinforcing plate (12), and the bottom of the reinforcing plate (12) is fixedly connected to the top of the base (1).

3. The military heavy-duty truck parts production mold according to claim 1, characterized in that: The water tank (2) is connected to the center of the top of the water tank (2) by a water injection pipe (13), and the top of the surface of the water injection pipe (13) is threaded with a sealing cap. There are two transmission components (3).

4. A production mold for military heavy-duty truck parts that can improve production efficiency according to claim 1, characterized in that: The lower mold (10) has four fixed corners at the bottom, each with a positioning sleeve (4). The inner cavity of the positioning sleeve (4) is slidably provided with a positioning rod (5). The bottom of the positioning rod (5) is fixedly connected to the top of the base (1).

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