A polyurethane sealing hot pressing molding equipment

Abstract

A polyurethane seal hot-pressing molding device relates to the field of polyurethane seal production, and includes an upper mold plate, a lower mold plate and an extrusion molding mechanism. The extrusion molding mechanism is arranged between the upper mold plate and the lower mold plate, and is used for hot-melt extrusion molding of polyurethane; a supporting mechanism for supporting the opening and closing of the upper mold plate and the lower mold plate is arranged between the upper mold plate and the lower mold plate; the extrusion molding mechanism includes a mold core, a heating plate and an electromagnetic heating tube, and a heat-insulating wall is arranged outside the heating plate. The polyurethane seal hot-pressing molding device of the present invention is wound around the outside of the heating plate by an electromagnetic heating tube, and the temperature of the heating plate is increased by electromagnetic heating, and then the heat is transferred to the mold core to increase the temperature of the mold core, and heated to a temperature exceeding the melting point of the polyurethane, and the polyurethane particles are clamped between the mold cores for isolation and melting, and the heat in the mold core is not easily lost by the heat-insulating wall, and then the melted polyurethane is extruded and molded by extruding the two mold cores up and down.

Description

Technical Field

[0001] The invention relates to the technical field of polyurethane seal production, in particular to a polyurethane seal hot pressing molding device. Background Art

[0002] Polyurethane seals play an extremely critical role in modern industry. In the field of mechanical engineering, many equipment such as hydraulic systems and pneumatic devices require reliable sealing to ensure efficient and stable operation. Polyurethane seals stand out with their excellent elasticity and wear resistance. In the automotive industry, whether it is various oil pipeline systems in the engine compartment or the shock-absorbing components of the chassis, polyurethane seals play an important role in preventing leakage, reducing wear, and buffering shock. It can adapt to different operating temperatures, pressures and media environments, effectively extend the service life of equipment, and reduce maintenance costs. It is indispensable in various industrial scenarios and is one of the core components to ensure the sealing and functionality of the system.

[0003] At present, hot pressing molding of polyurethane seals is mostly produced by hot pressing molds. Due to the different thickness of the sealing products, the heating position between the polyurethane and the mold is uneven. In addition, the mold does not have a heat preservation function. The heat of the melted polyurethane is easily dissipated during the extrusion process, which leads to the poor fluidity of the melted polyurethane. When the local temperature of the mold surface is lower than the melting point of the polyurethane, the polyurethane will solidify prematurely in the mold, causing embolism. The extruded sealing products are incomplete and have a high defective rate. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, the purpose of the present invention is to provide a polyurethane seal hot pressing molding equipment, in which polyurethane particles are clamped between mold cores for isolated melting, and the heat in the mold core is not easily dissipated through the insulation wall, and the melted polyurethane is extruded and molded by squeezing the two mold cores up and down.

[0006] To achieve the above-mentioned purpose, the present invention proposes a polyurethane seal hot pressing molding equipment, including an upper template, a lower template and an extrusion molding mechanism, wherein the extrusion molding mechanism is arranged between the upper template and the lower template, and the extrusion molding mechanism is used for hot-melt extrusion molding of polyurethane. A supporting mechanism for supporting the opening and closing of the upper template and the lower template is arranged between the upper template and the lower template. The extrusion molding mechanism includes a mold core, a heating plate and an electromagnetic heating tube, wherein two mold cores are arranged, and the two mold cores are respectively arranged on the extrusion corresponding surfaces of the upper template and the lower template, and the heating plate is arranged on the back side of the mold core that is extruded, and the heating plate is made of heat-conducting and electrically conductive material, and the electromagnetic heating tube is wrapped around the outside of the heating plate, and an insulating wall is arranged outside the heating plate.

[0007] Furthermore, the electromagnetic heating tube is wound around the outer side of the heating plate in a non-contact manner, the surface of the electromagnetic heating tube is made of insulating ceramic material, a graphite battery core is arranged inside the electromagnetic heating tube, an electromagnetic heating control board is arranged on the upper template and the lower template, a conductive contact is arranged at the end of the electromagnetic heating tube, and the conductive contact is electrically connected to the electromagnetic heating control board through a wire.

[0008] Furthermore, the heating plate is made of tungsten alloy, and a support seat is arranged between the heating plate and the upper template or the lower template.

[0009] Furthermore, it also includes a cooling mechanism, which is used to quickly cool the mold core. The cooling mechanism includes a fan and a cooling air duct, wherein the cooling air duct is arranged inside the heating plate, the air outlet end of the fan is connected to the air inlet end of the cooling air duct, and the air outlet end of the cooling air duct is provided with an exhaust nozzle.

[0010] Furthermore, an air inlet check valve is provided between the fan and the cooling air duct, and an air outlet check valve is provided between the cooling air duct and the exhaust nozzle.

[0011] Furthermore, the mold core is made of graphite crucible material, a riser is provided at the edge of the mold core, and a material riser is provided at the edge of the lower mold plate, and the material riser corresponds to the riser.

[0012] Furthermore, a feeding mechanism is provided at the top of the upper template, and the feeding mechanism is used to gradually extrude polyurethane into between the two mold cores. The feeding mechanism includes a hopper, a feeding push rod and a feeding trough, wherein the hopper is provided at the top of the upper template, the feeding trough is provided at the bottom of the hopper, and the bottom of the feeding trough is communicated with the inner side of the mold core, the feeding push rod is provided on the inner side of the hopper, the feeding push rod is an up and down reciprocating electric push rod, a pushing rod is provided on the output shaft of the feeding push rod, a scraping fin is provided on the pushing rod, and an extrusion head is provided at the bottom of the pushing rod.

[0013] Furthermore, a discharge port is provided at the bottom of the feeding trough, the length of the discharge port is equal to the distance between the scraping fin and the extrusion head, the discharge port and the extrusion head are adapted to each other, and the inner diameter of the discharge port is smaller than the outer diameter of the scraping fin.

[0014] Furthermore, an ejector push rod is arranged inside the lower template, an ejector pin is arranged on a power shaft of the ejector push rod, and an upper end of the ejector pin penetrates the mold core in the lower template.

[0015] Furthermore, the support mechanism includes a support hydraulic rod and a support block, wherein the support block is arranged on the outside of the upper template and the lower template, and the support hydraulic rod is arranged between the upper template and the lower template.

[0016] Beneficial effect: The present invention wraps the electromagnetic heating tube around the outside of the heating plate, raises the temperature of the heating plate by electromagnetic heating, and then heat transfer raises the temperature of the mold core to a temperature exceeding the melting point of the polyurethane. The polyurethane particles are clamped between the mold cores for isolated melting, and the heat in the mold core is not easily dissipated by the heat insulation wall, and then the melted polyurethane is extruded into shape by squeezing the two mold cores up and down.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which: Figure 1 It is a schematic diagram of the overall structure of a polyurethane seal hot pressing molding device according to one embodiment of the present invention; Figure 2 A schematic diagram of a partial structure of a polyurethane seal hot pressing molding device according to an embodiment of the present invention; Figure 3 A front cross-sectional view of a polyurethane seal hot pressing molding device according to an embodiment of the present invention; Figure 4 A front cross-sectional view of an upper mold plate in a polyurethane seal hot pressing molding device according to an embodiment of the present invention; Figure 5 A schematic diagram of the structure of a mold core in a polyurethane seal hot pressing molding device according to an embodiment of the present invention; Figure 6 The figure is a schematic structural diagram of a push rod in a polyurethane seal hot pressing molding device according to an embodiment of the present invention.

[0019] As shown in the figure: 1. Upper template; 2. Support mechanism; 21. Support hydraulic rod; 22. Support block; 23. Hydraulic rod output shaft; 3. Lower template; 4. Feeding mechanism; 41. Feeding push rod; 411. Push rod bracket; 412. Disassembly and assembly seat; 42. Hopper; 43. Push rod; 431. Scraping fin; 432. Extrusion head; 44. Feeding trough; 45. Discharge port; 5. Extrusion molding mechanism; 51. Mold core; 52. Feeding support; 53. Heating plate; 54. Electromagnetic heating tube; 55. Conductive contact; 56. Support seat; 57. Insulation wall; 58. Riser; 59. Electromagnetic heating control board; 6. Cooling mechanism; 61. Fan; 62. Exhaust nozzle; 63. Inlet check valve; 64. Exhaust check valve; 65. Air duct; 66. Cooling air duct; 7. Ejector push rod; 71. Ejector pin. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0021] The following describes the polyurethane seal hot pressing molding equipment according to the embodiment of the present invention in conjunction with the accompanying drawings.

[0022] like Figure 1-Figure 4 As shown, the polyurethane seal hot pressing molding equipment provided by the embodiment of the present invention includes an upper template 1, a lower template 3 and an extrusion molding mechanism 5, wherein the extrusion molding mechanism 5 is arranged between the upper template 1 and the lower template 3, the extrusion molding mechanism 5 is used for hot melt extrusion molding of polyurethane, and a supporting mechanism 2 for supporting the upper template 1 and the lower template 3 to open and close is arranged between the upper template 1 and the lower template 3.

[0023] The extrusion molding mechanism 5 includes a mold core 51, a heating plate 53 and an electromagnetic heating tube 54, wherein two mold cores 51 are provided, and the two mold cores 51 are respectively provided on the extrusion corresponding surfaces of the upper mold plate 1 and the lower mold plate 3, and the heating plate 53 is provided on the back side of the mold core 51 under extrusion, and the heating plate 53 is made of heat-conducting and electrically-conductive material, and the electromagnetic heating tube 54 is wound around the outside of the heating plate 53, and an insulating wall 57 is provided outside the heating plate 53.

[0024] Specifically, when hot-melt extrusion molding is performed on polyurethane, firstly, the upper mold plate 1 and the lower mold plate 3 are supported and opened by the support mechanism 2 , and a proper amount of polyurethane particles are placed in the mold core 51 of the lower mold plate 3 .

[0025] Then the support mechanism 2 drives the upper mold 1 and the lower mold 3 to be pressed and closed, and then the electromagnetic heating tube 54 generates an alternating magnetic field through the electromagnetic heating control board 59. After the magnetic field acts on the heating plate 53, the temperature of the heating plate 53 rises, and the heating plate 53 increases the temperature of the mold core 51 through heat transfer with the mold core 51, thereby increasing the temperature of the polyurethane in the mold core 51. During the heating process, the outer side of the heating plate 53 is thermally protected by the insulation wall 57. As the temperature continues to rise, when the temperature in the mold core 51 exceeds the melting point of the polyurethane, the polyurethane melts in the mold core 51 and fills the inner side of the mold core 51 to form the product shape.

[0026] Then the electromagnetic heating tube 54 stops heating the heating plate 53. When the temperature inside the mold core 51 cools down, the polyurethane is fixed to form a product. Finally, the upper mold plate 1 and the lower mold plate 3 are supported and opened by the supporting mechanism 2 to take out the polyurethane sealing product.

[0027] In one embodiment of the present invention, Figure 3 , Figure 4As shown, the electromagnetic heating tube 54 is wound around the outer side of the heating plate 53 in a non-contact manner, the surface of the electromagnetic heating tube 54 is made of insulating ceramic material, a graphite battery core is arranged inside the electromagnetic heating tube 54, an electromagnetic heating control board 59 is arranged on both the upper template 1 and the lower template 3, and a conductive contact 55 is arranged at the end of the electromagnetic heating tube 54, and the conductive contact 55 is electrically connected to the electromagnetic heating control board 59 through a wire.

[0028] Specifically, the electromagnetic heating tube 54 generates an alternating magnetic field by being electrically connected to the electromagnetic heating control board 59. The insulating ceramic material on the surface of the electromagnetic heating tube 54 allows the magnetic field to pass through easily, and can also prevent the current inside the electromagnetic heating tube 54 from breaking down, thereby preventing the electromagnetic heating tube 54 and the heating plate 53 from being affected. The graphite battery inside the electromagnetic heating tube 54 not only provides the function of a conductor, but also makes the electromagnetic heating tube 54 resistant to high temperatures, reduces the aging of the electromagnetic heating tube 54, and the resistance change of the graphite battery in a high temperature environment is lower than that of a traditional metal heating coil, which does not affect the heating effect.

[0029] In one embodiment of the present invention, Figure 3 , Figure 4 As shown, the heating plate 53 is made of tungsten alloy, and a support seat 56 is arranged between the heating plate 53 and the upper template 1 or the lower template 3.

[0030] Specifically, the heating plate 53 made of tungsten alloy can conduct electricity and adapt to the alternating magnetic field of the electromagnetic heating tube 54, so as to generate eddy current heating inside the heating plate 53. In addition, the heating plate 53 made of tungsten alloy has good high temperature resistance and high hardness, and can provide good support for the mold core 51 under high temperature environment.

[0031] In one embodiment of the present invention, Figure 3 , Figure 4 As shown, the mold core 51 further includes a cooling mechanism 6, which is used to quickly cool the mold core 51. The cooling mechanism 6 includes a fan 61 and a cooling air channel 66, wherein the cooling air channel 66 is arranged inside the heating plate 53, the air outlet end of the fan 61 is connected to the air inlet end of the cooling air channel 66, and the air outlet end of the cooling air channel 66 is provided with an exhaust nozzle 62. An air inlet check valve 63 is provided between the fan 61 and the cooling air channel 66, and an air outlet check valve 64 is provided between the cooling air channel 66 and the exhaust nozzle 62.

[0032] Specifically, after the polyurethane is melted in the mold core 51 and extruded into shape, the temperature of the mold core 51 drops slowly due to the addition of the insulation wall 57. In order to quickly promote the solidification of the melted polyurethane in the mold core 51, the external cold air is transmitted to the heating plate 53 through the air duct 65 by the fan 61, and the heat in the heating plate 53 is carried and transferred and discharged from the exhaust nozzle 62, so that the heating plate 53 is quickly cooled, thereby prompting the melted polyurethane in the mold core 51 to quickly cool and solidify.

[0033] The inlet check valve 63 and the outlet check valve 64 at both ends of the cooling air duct 66 allow the air flow to flow in one direction, preventing the hot air in the heating plate 53 from flowing back into the fan 61 , thereby playing a role in thermal protection of the fan 61 .

[0034] In one embodiment of the present invention, Figure 2 , Figure 5 As shown, the mold core 51 is made of graphite crucible material, a riser 58 is provided at the edge of the mold core 51 , and a material riser 52 is provided at the edge of the lower mold plate 3 , and the material riser 52 corresponds to the riser 58 .

[0035] Specifically, since the graphite crucible material is resistant to high temperatures and has good electrical conductivity, during the electromagnetic heating of the heating plate 53 , eddy current heating can also be generated inside the mold core 51 , causing the temperature of the mold core 51 to rise quickly.

[0036] The air and excess polyurethane melted fluid in the mold core 51 flow out from the riser 58, making the polyurethane in the mold core 51 flow more freely, accelerating the polyurethane to fill the mold core 51, and making the product more full. The melted polyurethane in the riser 58 falls directly into the riser 52 for collection.

[0037] In one embodiment of the present invention, Figure 4 and Figure 6 As shown, a feeding mechanism 4 is provided on the top of the upper template 1, and the feeding mechanism 4 is used for gradually extruding polyurethane into between the two mold cores 51, and the feeding mechanism 4 includes a hopper 42, a feeding push rod 41 and a feeding trough 44, wherein the hopper 42 is detachably arranged on the top of the upper template 1 through a disassembly seat 412, the feeding trough 44 is arranged at the bottom of the hopper 42, and the bottom of the feeding trough 44 is communicated with the inner side of the mold core 51, and the feeding push rod 41 is fixedly arranged on the inner side of the hopper 42 through a push rod bracket 411.

[0038] The feeding push rod 41 is an electric push rod that reciprocates up and down. A push rod 43 is arranged on the output shaft of the feeding push rod 41 . A scraping fin 431 is arranged on the push rod 43 . A squeezing head 432 is arranged at the bottom of the push rod 43 .

[0039] Specifically, in order to allow the polyurethane to fill the interior of the mold core 51 during the melting process, during the process of heating the polyurethane in the mold core 51, the push rod 43 is driven by the feeding push rod 41 to reciprocate up and down, and the extrusion head 432 at the bottom of the push rod 43 continuously squeezes the polyurethane particles in the feeding trough 44 into the mold core 51, and finally the mold core 51 is filled with the polyurethane melt fluid, thereby preventing the mold core 51 from being defective due to insufficient raw materials.

[0040] During the up and down movement of the push rod 43, the polyurethane particles in the hopper 42 are filled into the feeding trough 44 by gravity, and the scraping fins 431 move the polyurethane particles downward, and finally pass through the extrusion head 432 at the bottom of the push rod 43 and are gradually squeezed into the mold core 51 for melting. The push rod 43 is used to squeeze up and down to prevent the occurrence of material blockage.

[0041] When the mold core 51 is filled with the polyurethane melt fluid and the riser 58 continuously emits the polyurethane melt fluid, it means that the mold core 51 is already filled with the polyurethane melt fluid and the feeding push rod 41 can be stopped.

[0042] In one embodiment of the present invention, Figure 4 and Figure 6 As shown, a discharge port 45 is provided at the bottom of the feeding trough 44, and the length of the discharge port 45 is equal to the distance from the scraper fin 431 to the extrusion head 432, the discharge port 45 and the extrusion head 432 are adapted to each other, and the inner diameter of the discharge port 45 is smaller than the outer diameter of the scraper fin 431, which serves to limit the movement of the push rod 43.

[0043] Specifically, during the up-and-down movement of the push rod 43, the polyurethane is squeezed into the mold core 51 from the discharge port 45, and the maximum movement position of the bottom of the push rod 43 is flush with the bottom of the discharge port 45, so that the upper surface of the polyurethane sealing product is smoother after molding. In addition, during the up-and-down movement of the push rod 43, the discharge port 45 allows the gas in the mold core 51 to be discharged smoothly, reducing the gas residue in the mold core 51.

[0044] In one embodiment of the present invention, Figure 3 As shown, an ejector rod 7 is disposed inside the lower mold plate 3 , and an ejector pin 71 is disposed on the power shaft of the ejector rod 7 , and the upper end of the ejector pin 71 penetrates the mold core 51 in the lower mold plate 3 .

[0045] Specifically, after the polyurethane sealing product in the mold core 51 is cooled, the upper mold plate 1 moves upward, and the upper and lower mold cores 51 open to each other. At this time, the ejector pin 71 is driven by the ejector rod 7 to eject the polyurethane sealing product in the mold core 51 upward.

[0046] In one embodiment of the present invention, Figure 3As shown, the support mechanism 2 includes a support hydraulic rod 21 and a support block 22 , wherein the support block 22 is arranged on the outside of the upper template 1 and the lower template 3 , and the support hydraulic rod 21 is arranged between the upper template 1 and the lower template 3 .

[0047] Specifically, during the process of the upper mold plate 1 and the lower mold plate 3 opening and closing up and down, the hydraulic rod output shaft 23 supporting the hydraulic rod 21 drives the support blocks 22 at the upper and lower positions to move, thereby driving the upper mold plate 1 and the lower mold plate 3 to open and close up and down.

[0048] In order to clearly explain the above embodiments, refer to Figure 1-Figure 6 The specific working principle of the polyurethane seal hot pressing molding equipment of the present invention is as follows: when in use, the upper mold plate 1 is first driven to move upward by the supporting hydraulic rod 21, and the upper mold plate 1 and the lower mold plate 3 are opened away from each other, and then a proper amount of polyurethane particles are placed in the mold core 51 of the lower mold plate 3. Then, the upper mold plate 1 and the lower mold plate 3 are pressed and closed by the supporting hydraulic rod 21.

[0049] Subsequently, the electromagnetic heating tube 54 is energized through the electromagnetic heating control board 59 to generate an alternating magnetic field. After the magnetic field acts on the heating plate 53, eddy currents are generated inside the heating plate 53 to increase its temperature. The heating plate 53 increases the temperature of the mold core 51 through heat transfer with the mold core 51, thereby heating the polyurethane in the mold core 51. During the heating process, the outer side of the heating plate 53 is thermally protected by the insulation wall 57, and the temperature continues to rise until the temperature in the mold core 51 exceeds the melting temperature of the polyurethane. The polyurethane melts in the mold core 51 and fills the interior of the mold core 51 to form the product shape.

[0050] During the process of heating polyurethane in the mold core 51, the push rod 43 is driven to reciprocate up and down by the feeding push rod 41, and the extrusion head 432 at the bottom of the push rod 43 continuously squeezes the polyurethane particles in the feeding trough 44 into the mold core 51, and finally the mold core 51 is filled with polyurethane melt fluid, so as to prevent the product from being defective due to insufficient raw materials in the mold core 51. When the mold core 51 is filled with polyurethane melt fluid and the riser 58 continuously emits polyurethane melt fluid, it means that the mold core 51 is full, and the feeding push rod 41 can be stopped.

[0051] After the polyurethane is melted in the mold core 51 and extruded to shape, the temperature of the mold core 51 drops slowly due to the addition of the insulation wall 57. In order to quickly promote the solidification of the melted polyurethane in the mold core 51, the external cold air is transmitted to the heating plate 53 through the air duct 65 by the fan 61, and the heat in the heating plate 53 is carried and transferred and discharged from the exhaust nozzle 62, so that the heating plate 53 is quickly cooled, thereby prompting the melted polyurethane in the mold core 51 to quickly cool and solidify.

[0052] When the polyurethane sealing product in the mold core 51 is cooled, the upper mold plate 1 is driven to move upward by the supporting hydraulic rod 21. When the upper mold plate 1 moves upward, the upper and lower mold cores 51 are opened to each other. At this time, the ejector pin 71 is driven by the ejector push rod 7 to eject the polyurethane sealing product in the mold core 51 upward.

[0053] In summary, the polyurethane seal hot pressing molding equipment of the embodiment of the present invention has an electromagnetic heating tube wrapped around the outside of the heating plate, and the temperature of the heating plate is increased by electromagnetic heating, and then the heat is transferred to the mold core to increase the temperature of the mold core, and heated to a temperature exceeding the melting point of the polyurethane. The polyurethane particles are clamped between the mold cores for isolated melting, and the heat in the mold core is not easily dissipated by the insulation wall, and then the melted polyurethane is extruded and molded by squeezing the two mold cores up and down.

[0054] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and deform the above embodiments within the scope of the present invention.

Claims

1. A polyurethane seal hot pressing molding device, characterized in that: It comprises an upper template (1), a lower template (3) and an extrusion molding mechanism (5), wherein the extrusion molding mechanism (5) is arranged between the upper template (1) and the lower template (3), and a support mechanism (2) for supporting the upper template (1) and the lower template (3) to open and close is arranged between the upper template (1) and the lower template (3); The extrusion molding mechanism (5) comprises a mold core (51), a heating plate (53) and an electromagnetic heating tube (54), wherein two mold cores (51) are provided, and the two mold cores (51) are respectively provided on the extrusion corresponding surfaces of the upper mold plate (1) and the lower mold plate (3), the heating plate (53) is provided on the back side of at least one mold core (51) that is subjected to extrusion, the heating plate (53) is made of a heat-conducting and electrically-conducting material, the electromagnetic heating tube (54) is wound around the outside of the heating plate (53), and a heat-insulating wall (57) is provided outside the heating plate (53) to prevent the heat in the mold core (51) from being easily lost.

2. The polyurethane seal hot pressing molding equipment according to claim 1, characterized in that: The electromagnetic heating tube (54) is wound around the outside of the heating plate (53) in a non-contact manner; the surface of the electromagnetic heating tube (54) is made of insulating ceramic material; a graphite battery core is arranged inside the electromagnetic heating tube (54); an electromagnetic heating control board (59) is arranged on both the upper template (1) and the lower template (3); a conductive contact (55) is arranged at the end of the electromagnetic heating tube (54); and the conductive contact (55) is electrically connected to the electromagnetic heating control board (59) via a wire.

3. The polyurethane seal hot pressing molding equipment according to claim 1, characterized in that: The heating plate (53) is made of tungsten alloy, and a support seat (56) is provided between the heating plate (53) and the upper template (1) or the lower template (3).

4. The polyurethane seal hot pressing molding equipment according to claim 3, characterized in that: The mold core (51) is further comprised of a cooling mechanism (6), the cooling mechanism (6) being used for rapidly cooling the mold core (51), the cooling mechanism (6) comprising a fan (61) and a cooling air duct (66), wherein the cooling air duct (66) is arranged inside the heating plate (53), an air outlet end of the fan (61) is connected to an air inlet end of the cooling air duct (66), and an exhaust nozzle (62) is arranged at the air outlet end of the cooling air duct (66).

5. The polyurethane seal hot pressing molding equipment according to claim 4, characterized in that: An air inlet check valve (63) is provided between the fan (61) and the cooling air passage (66), and an air outlet check valve (64) is provided between the cooling air passage (66) and the exhaust nozzle (62).

6. The polyurethane seal hot pressing molding equipment according to claim 1, characterized in that: The mold core (51) is made of graphite crucible material, a riser (58) is provided at the edge of the mold core (51), and a material riser (52) is provided at the edge of the lower mold plate (3), and the material riser (52) corresponds to the riser (58).

7. The polyurethane seal hot pressing molding equipment according to claim 1, characterized in that: A feeding mechanism (4) is arranged at the top of the upper mold plate (1), and the feeding mechanism (4) is used to gradually extrude polyurethane into between the two mold cores (51). The feeding mechanism (4) comprises a hopper (42), a feeding push rod (41) and a feeding trough (44), wherein the hopper (42) is arranged at the top of the upper mold plate (1), the feeding trough (44) is arranged at the bottom of the hopper (42), and the bottom of the feeding trough (44) is communicated with the inner side of the mold core (51), and the feeding push rod (41) is arranged at the inner side of the hopper (42); The feeding push rod (41) is an electric push rod that reciprocates up and down. A push rod (43) is arranged on the output shaft of the feeding push rod (41). A scraping fin (431) is arranged on the push rod (43). A material extrusion head (432) is arranged at the bottom of the push rod (43).

8. The polyurethane seal hot pressing molding equipment according to claim 7, characterized in that: A discharge port (45) is provided at the bottom of the feeding trough (44); the length of the discharge port (45) is equal to the distance between the scraping fin (431) and the extrusion head (432); the discharge port (45) and the extrusion head (432) are adapted to each other; and the inner diameter of the discharge port (45) is smaller than the outer diameter of the scraping fin (431).

9. The polyurethane seal hot pressing molding equipment according to claim 1, characterized in that: An ejector rod (7) is disposed inside the lower mold plate (3), and an ejector pin (71) is disposed on a power shaft of the ejector rod (7), wherein the upper end of the ejector pin (71) penetrates the mold core (51) inside the lower mold plate (3).

10. The polyurethane seal hot pressing molding equipment according to claim 1, characterized in that: The support mechanism (2) comprises a support hydraulic rod (21) and a support block (22), wherein the support block (22) is arranged outside the upper template (1) and the lower template (3), and the support hydraulic rod (21) is arranged between the upper template (1) and the lower template (3).

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