Flame-retardant cover assembly for high-temperature protection of bolt and preparation method of flame-retardant cover assembly

Abstract

The invention relates to the technical field of bolt high-temperature protection, in particular to a flame-retardant cover assembly for bolt high-temperature protection and a preparation method.The flame-retardant cover assembly comprises a cylindrical flame-retardant cover and a cap head flame-retardant cover, and the cylindrical flame-retardant cover is arranged on the outer side of a bolt threaded sleeve in a sleeving mode; the inner diameter of the barrel-shaped flame-retardant cover is larger than the outer diameter of a bolt threaded sleeve, the cap head portion flame-retardant cover is connected to the outer side of a bolt and nut rotating portion in a sleeved mode, the cap head portion flame-retardant cover is connected with the bolt and nut rotating portion in a matched mode, and the bolt and nut rotating portion and the bolt threaded sleeve are vertically connected into a whole. And the cylindrical flame-retardant cover is pressed and limited through the matching of the cap part flame-retardant cover and the bolt and nut rotating part. The flame-retardant cover assembly for high-temperature protection of the bolt is prepared in an injection molding mode, the bolt is sleeved with the flame-retardant cover assembly, a good protection function can be achieved, and adverse effects caused by too high temperature on the structure of the bolt are prevented.

Description

Technical Field

[0001] This invention relates to the field of high-temperature protection technology for bolts, specifically to a flame-retardant cover assembly for high-temperature protection of bolts and its preparation method. Background Technology

[0002] In special areas such as bridges, bolt assemblies are needed to secure ropes. However, to ensure safety, these bolts need to be inspected regularly. But with the increasing prevalence of electric vehicles, collisions and spontaneous combustion are becoming more common. Once these burning vehicles approach or directly impact the bolts, they inevitably deform, affecting the stability of the connection and making disassembly and inspection extremely difficult later. Therefore, designing a flame-retardant cover assembly and its manufacturing method for high-temperature protection of bolts is particularly important to solve the above problems. Summary of the Invention

[0003] To address the aforementioned problems, this invention presents a flame-retardant cover assembly for high-temperature protection of bolts and a method for its preparation. The flame-retardant cover assembly for high-temperature protection of bolts is prepared by injection molding. When the flame-retardant cover assembly is fitted over the bolt, it provides good protection, preventing excessively high temperatures from adversely affecting the bolt's structure. Furthermore, the prepared flame-retardant cover assembly has the advantages of simple structure, ease of production, and ease of assembly and disassembly.

[0004] To address the aforementioned technical problems, this invention provides a method for preparing a flame-retardant cover assembly for high-temperature protection of bolts, comprising the following steps:

[0005] S1: Batching: The injection molding raw materials are fed into the mixing device of the injection molding machine one by one according to the proportion through the pumping system;

[0006] S2: Heating and Mixing: Start the heating system in the mixing device and use the stirring mechanism to heat and mix the injection molding raw materials in the mixing device;

[0007] S3: Injection pipe heating: Activate the water circulation heating device wrapped around the outside of the injection pipe to heat the injection pipe;

[0008] S4: Injection molding: Insert the injection nozzle into the injection hole of the injection mold, start the pressurization system connected to the mixing device, and use pressurization to force the mixed raw materials into the injection mold along the injection nozzle. Each time, a set of cylindrical flame-retardant covers and cap head flame-retardant covers are injection molded together through the injection mold.

[0009] S5: Demolding: Open the injection mold and remove the cylindrical flame retardant cover and the cap head flame retardant cover from the injection mold. Use the cutting tool set on the injection mold to separate the cylindrical flame retardant cover from the cap head flame retardant cover.

[0010] S6: Grinding and polishing: Use a grinding machine to polish the outer wall of the cylindrical flame retardant cover and the flame retardant cover at the cap, and remove excess burrs on the cylindrical flame retardant cover and the flame retardant cover at the cap. After grinding, the cylindrical flame retardant cover and the flame retardant cover at the cap are put into storage.

[0011] S7: Pressurized Flushing: After a batch of cylindrical flame-retardant covers and cap head flame-retardant covers are injection molded, connect the waste liquid collection cover to the injection nozzle, turn on the water pump connected to the water circulation heating device, inject hot water into the mixing device, continue to turn on the pressurization system, and use hot water to flush the injection pipes and the internal channels of the injection nozzle for reuse.

[0012] Further, the injection molding machine in step S1 comprises a worktable, a support plate, injection molds, a mold mounting rotor, a fixed base, a Z-shaped bracket, an injection nozzle, and a mixing device. The worktable is connected to the support plate directly above it via a support rod. The fixed base is located at the top left end of the worktable. The mold mounting rotor is frustum-shaped, and its top has a groove that matches the mold mounting rotor. The mold mounting rotor is rotatably connected within the groove and connected to a rotary drive mechanism. Two injection molds are fixed to the top of the mold mounting rotor. The mixing device is fixed to the top of the worktable via a Z-shaped bracket. The mixing device is located on the lower end face of the Z-shaped bracket and directly above the right end of the worktable. The upper end of the Z-shaped bracket extends directly above the right end of the mold mounting rotor. The injection nozzle is located on the bottom surface of the upper end of the Z-shaped bracket and is connected to the mixing device via an injection pipe. The mixing device is connected to a storage tank assembly on the support plate via a pumping system. The top of the mixing device is also connected to a pressurization system.

[0013] Furthermore, the rotary drive mechanism includes a servo motor, a drive gear, and an external gear ring. The upper end of the mold mounting turntable extends out of the groove. The external gear ring is fitted onto the outer wall of the upper end of the mold mounting turntable. The servo motor is mounted on the outer wall of the fixed base. The drive gear is fitted onto the output shaft of the servo motor and meshes with the external gear ring.

[0014] Furthermore, the injection mold includes a mold mounting plate, a lower support plate, an upper support plate, an upper mold, a lower mold, a lifting cylinder, a lifting column, a guide cylinder, a transmission plate, a U-shaped support base, a lower support rod, an upper support rod, a support shaft, an upper connecting rod, and a limiting pin. The lower support plate is connected to the top of the mold mounting turntable via the mold mounting plate. The bottom of the mold mounting plate is provided with several guide columns integrally connected to it. The top of the mold mounting turntable has a first guide hole relative to the guide columns. A lifting cylinder is installed at the bottom of the worktable. The cylinder is located directly below the right end of the mold mounting rotary base. A first through hole is formed on the worktable plate relative to the output shaft of the lifting cylinder. A second through hole is formed on the bottom of the fixed base relative to the first through hole. Two third through holes are formed on the mold mounting rotary base directly below the two mold mounting plates, relative to the second through hole. The output shaft of the lifting cylinder passes through the first, second, and third through holes in sequence to contact the mold mounting plate. The upper mold is fixed to the bottom of the upper support plate, and the lifting cylinder is fixed to the lower support plate. The cylinder's output shaft is connected to the transmission plate. A guide cylinder is fixed to each of the lower support plates on both sides of the lifting cylinder. A matching lifting column is movably connected inside each guide cylinder. The upper end of the lifting column is connected to the top of the lower mold. Notches are provided on the side walls of the guide cylinders. Both ends of the transmission plate extend into the guide cylinders along the notches and connect to the lower ends of the lifting columns. Under the action of the lifting cylinder, the transmission plate can slide up and down along the notches. The support shaft is horizontally rotatably connected between the two side walls of the U-shaped support base. The U-shaped support base is fixed to one side of the lower mold. On the lower support plate, the upper connecting rod is fixed to the bottom of the upper support plate on one side of the upper mold. The upper support plate is connected to the support shaft through the upper connecting rod. The upper connecting rod can rotate around the support shaft. A lower support rod is vertically fixed to the top of the lower support plate on the other side of the lower mold. A first pin sleeve is provided at the upper end of the lower support rod. The upper support rod is vertically fixed to the bottom of the upper support plate on the other side of the upper mold. A second pin sleeve is provided at the lower end of the upper support rod. The first pin sleeve is connected to the second pin sleeve through a limiting pin. A cutting tool is also rotatably connected to the lower support plate.

[0015] Furthermore, the upper and lower molds are made of one of the following materials: PET, PS, PE, PC, PP, PVC, or ABS.

[0016] Furthermore, two mixing devices are provided at the top of the lower end of the Z-shaped support, and the two mixing devices are placed one in front of the other. The pumping system is connected to the two mixing devices respectively through a reversing valve assembly. The storage tank assembly is composed of several storage tanks. The storage tanks are set on the top of the support platform through a weighing assembly. A discharge port is provided on the side wall of the lower end of the mixing device. The discharge port is connected to the injection pipe through an injection switching valve.

[0017] Furthermore, a water circulation heating device is connected to the outer wall of the injection molding pipe. The water circulation heating device includes a heating cover assembly and a heating water tank. The heating cover assembly is composed of an upper cover and a lower cover connected together. The lower cover is fixed on a Z-shaped bracket. Heating grooves matching the injection molding pipe are opened at the bottom of the upper cover and the top of the lower cover. Heating cavities are opened in the side walls of the upper cover and the lower cover. The heating cavities are connected to the heating water tank through circulation pipes. A temperature sensor and an electric heating wire are installed in the heating water tank. The water inlets of the upper cover and the lower cover are opened at the top of the upper end, and the water outlets of the upper cover and the lower cover are opened on the side walls of the lower end.

[0018] Furthermore, a collection cover placement ring is provided at the bottom of the Z-shaped bracket, and a waste liquid collection cover is detachably connected inside the collection cover placement ring. The waste liquid collection cover is connected to a waste liquid collection box set on the support platform through a pipe.

[0019] The present invention also provides a flame-retardant cover assembly for high-temperature protection of bolts, comprising a cylindrical flame-retardant cover and a cap-head flame-retardant cover. The cylindrical flame-retardant cover is sleeved on the outside of the bolt threaded sleeve, and the inner diameter of the cylindrical flame-retardant cover is larger than the outer diameter of the bolt threaded sleeve. The cap-head flame-retardant cover is sleeved on the outside of the bolt and nut rotating part, and the cap-head flame-retardant cover is connected to the bolt and nut rotating part by a fitting. The bolt and nut rotating part and the bolt threaded sleeve are connected as a whole. The cylindrical flame-retardant cover is pressed and limited by the cooperation between the cap-head flame-retardant cover and the bolt and nut rotating part.

[0020] With the above structure, the present invention has the following beneficial effects:

[0021] 1. This invention manufactures a flame-retardant cover assembly for high-temperature protection of bolts by injection molding. The flame-retardant cover assembly, when fitted over the bolt, provides good protection and prevents excessively high temperatures from adversely affecting the bolt's structure. Furthermore, the prepared flame-retardant cover assembly has the advantages of simple structure, easy production, and easy assembly and disassembly.

[0022] 2. The present invention has two injection molds on the mold mounting base. When one injection mold is demolded, the other injection mold can be used for injection molding, which greatly improves the molding efficiency.

[0023] 3. The present invention has a water circulation heating device installed on the outside of the injection pipe. The water circulation heating device prevents the raw materials in the injection pipe from solidifying when the injection stops, reducing unnecessary losses and increasing practicality. Attached Figure Description

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 This is an assembly diagram for the flame-retardant cover assembly.

[0026] Figure 2 This is a schematic diagram of an injection molding machine.

[0027] Figure 3 This is a schematic diagram of the rotary drive mechanism.

[0028] Figure 4 This is a structural diagram of an injection mold.

[0029] Figure 5 This is a partial structural diagram of the Z-shaped support.

[0030] In the diagram: 1 is a cylindrical flame-retardant cover, 2 is a flame-retardant cap head cover, 3-1 is a bolt threaded sleeve, 3-2 is a bolt and nut rotating part, 4 is a worktable, 5 is a support platform, 6 is an injection mold, 7 is a mold mounting rotary seat, 8 is a fixed seat, 9 is a Z-shaped bracket, 10 is an injection nozzle, 11 is a mixing device, 12 is a storage tank assembly, 13 is a servo motor, 14 is a drive gear, 15 is an external gear ring, 16 is a mold mounting plate, 17 is a lower support plate, 18 is an upper support plate, and 19 is an upper mold. 20 is the lower mold, 21 is the lifting cylinder, 22 is the lifting column, 23 is the guide cylinder, 24 is the transmission plate, 25 is the U-shaped support seat, 26 is the lower support rod, 27 is the support shaft, 28 is the upper connecting rod, 29 is the limit pin, 30 is the lifting cylinder, 31 is the first pin sleeve, 32 is the upper support rod, 33 is the second pin sleeve, 34 is the cutting tool, 35 is the heating water tank, 36-1 is the upper cover, 36-2 is the lower cover, 37 is the waste liquid collection cover, and 38 is the waste liquid collection box. Detailed Implementation

[0031] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that certain terms indicating orientation or positional relationships are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0033] In the description of this invention, it should be noted that the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] The present invention will be further described in detail below through specific embodiments.

[0035] like Figure 1 The illustrated flame-retardant cover assembly for high-temperature protection of bolts includes a cylindrical flame-retardant cover 1 and a cap-head flame-retardant cover 2. The cylindrical flame-retardant cover is fitted over the outside of the bolt threaded sleeve 3-1, with the inner diameter of the cylindrical flame-retardant cover being larger than the outer diameter of the bolt threaded sleeve. The cap-head flame-retardant cover is fitted over the outside of the bolt and nut rotating part 3-2, and the cap-head flame-retardant cover and the bolt and nut rotating part are connected by a fitting. The bolt and nut rotating part and the bolt threaded sleeve are integrally connected. The cylindrical flame-retardant cover is pressed and limited by the fit between the cap-head flame-retardant cover and the bolt and nut rotating part. This invention manufactures a flame-retardant cover assembly for high-temperature protection of bolts by injection molding. When fitted over the bolt, the flame-retardant cover assembly provides excellent protection, preventing excessively high temperatures from adversely affecting the bolt's structure. Furthermore, the prepared flame-retardant cover assembly has the advantages of simple structure, ease of production, and ease of assembly and disassembly.

[0036] This invention provides a method for preparing a flame-retardant cover assembly for high-temperature protection of bolts, comprising the following steps:

[0037] S1: Batching: The injection molding raw materials are fed into the mixing device of the injection molding machine one by one according to the proportion through the pumping system;

[0038] S2: Heating and Mixing: Start the heating system in the mixing device and use the stirring mechanism to heat and mix the injection molding raw materials in the mixing device;

[0039] S3: Injection pipe heating: Activate the water circulation heating device wrapped around the outside of the injection pipe to heat the injection pipe;

[0040] S4: Injection molding: Insert the injection nozzle into the injection hole of the injection mold, start the pressurization system connected to the mixing device, and use pressurization to force the mixed raw materials into the injection mold along the injection nozzle. Each time, a set of cylindrical flame-retardant covers and cap head flame-retardant covers are injection molded together through the injection mold.

[0041] S5: Demolding: Open the injection mold and remove the cylindrical flame retardant cover and the cap head flame retardant cover from the injection mold. Use the cutting tool set on the injection mold to separate the cylindrical flame retardant cover from the cap head flame retardant cover.

[0042] S6: Grinding and polishing: Use a grinding machine to polish the outer wall of the cylindrical flame retardant cover and the flame retardant cover at the cap, and remove excess burrs on the cylindrical flame retardant cover and the flame retardant cover at the cap. After grinding, the cylindrical flame retardant cover and the flame retardant cover at the cap are put into storage.

[0043] S7: Pressurized Flushing: After a batch of cylindrical flame-retardant covers and cap head flame-retardant covers are injection molded, connect the waste liquid collection cover to the injection nozzle, turn on the water pump connected to the water circulation heating device, inject hot water into the mixing device, continue to turn on the pressurization system, and use hot water to flush the injection pipes and the internal channels of the injection nozzle for reuse.

[0044] This invention adds a pressurized rinsing process, which can quickly clean the inside of the injection pipe and injection nozzle after injection molding, preventing residual raw materials from solidifying and reducing unnecessary losses.

[0045] The injection molding raw materials in step S1 above are specifically composed of 10-15 parts of resin glass fiber powder, 10-15 parts of asbestos fiber powder, 15-25 parts of brominated epoxy resin, 5-10 parts of cyanate ester resin, 10-15 parts of linear phenolic resin, 1-5 parts of curing accelerator, 30-40 parts of flame retardant, and 60-80 parts of water in the indicated mass percentages. The cyanate ester resin is a phenolic cyanate ester resin. The curing accelerator is cobalt acetylacetonate. The flame retardant is 10-(2,5-dihydroxyphenyl)-9,10-dihydro-9-oxa-10-phosphenanthrene-10-oxide modified phenolic epoxy resin.

[0046] like Figure 2The injection molding machine in step S1 shown consists of a worktable 4, a support plate 5, an injection mold 6, a mold mounting rotary seat 7, a fixed seat 8, a Z-shaped bracket 9, an injection nozzle 10, and a mixing device 11. The worktable is connected to the support plate directly above it via a support rod. The fixed seat is located at the top left end of the worktable. The mold mounting rotary seat is frustum-shaped, and its top has a groove that matches the mold mounting rotary seat. The mold mounting rotary seat is rotatably connected within the groove and connected to a rotary drive mechanism. The top of the mold mounting rotary seat... The device comprises two fixed injection molds. The mixing device is fixed to the top of the worktable via a Z-shaped bracket. The mixing device is positioned on the lower end face of the Z-shaped bracket and directly above the right end of the worktable. The upper end of the Z-shaped bracket extends directly above the right end of the mold mounting base. The injection nozzle is positioned on the bottom surface of the upper end of the Z-shaped bracket and connected to the mixing device via an injection pipe. The mixing device is connected to a storage tank assembly 12 mounted on the support platform via a pumping system. The top of the mixing device is also connected to a pressurization system. This invention provides two injection molds on the mold mounting base. When one injection mold is being demolded, the other injection mold can be used for injection molding, greatly improving molding efficiency.

[0047] like Figure 3 The rotary drive mechanism shown includes a servo motor 13, a drive gear 14, and an external gear ring 15. The upper end of the mold mounting base extends out of a groove. The external gear ring is fitted onto the outer wall of the upper end of the mold mounting base. The servo motor is mounted on the outer wall of the fixed base. The drive gear is fitted onto the output shaft of the servo motor and meshes with the external gear ring. During operation, the rotation of the servo motor is controlled to repeatedly position the two injection molds directly below the injection nozzle in a cyclical manner.

[0048] like Figure 4The injection mold shown includes a mold mounting plate 16, a lower support plate 17, an upper support plate 18, an upper mold 19, a lower mold 20, a lifting cylinder 21, a lifting column 22, a guide cylinder 23, a transmission plate 24, a U-shaped support base 25, a lower support rod 26, an upper support rod 32, a support shaft 27, an upper connecting rod 28, and a limiting pin 29. The lower support plate is connected to the top of the mold mounting rotary base via the mold mounting plate. The bottom of the mold mounting plate is provided with several guide pillars integrated with it. The top of the mold mounting rotary base has a first guide hole relative to the guide pillars. The worktable plate... A lifting cylinder 30 is installed at the bottom of the mold mounting base. The lifting cylinder is located directly below the right end of the mold mounting base. A first through hole is formed on the worktable plate relative to the output shaft end of the lifting cylinder. A second through hole is formed on the bottom of the fixed base relative to the first through hole. Two third through holes are formed on the mold mounting base directly below the two mold mounting plates relative to the second through hole. The output shaft end of the lifting cylinder passes through the first through hole, the second through hole, and the third through hole in sequence to contact the mold mounting plate. The upper mold is fixed to the bottom of the upper support plate. The lifting cylinder is fixed... The lifting cylinder is fixed on the lower support plate, and its output shaft is connected to the transmission plate. A guide cylinder is fixed on each of the lower support plates on both sides of the lifting cylinder. A matching lifting column is movably connected inside each guide cylinder. The upper end of the lifting column is connected to the top of the lower mold. Notches are provided on the side walls of the guide cylinders. Both ends of the transmission plate extend into the guide cylinders along the notches and are connected to the lower ends of the lifting columns. Under the action of the lifting cylinder, the transmission plate can slide up and down along the notches. The support shaft is horizontally rotatably connected between the two side walls of the U-shaped support seat. The U-shaped support seat is fixed to the lower mold. On the lower support plate on one side, an upper connecting rod is fixed to the bottom of the upper support plate on one side of the upper mold. The upper support plate is connected to the support shaft through the upper connecting rod, which can rotate around the support shaft. A lower support rod is vertically fixed to the top of the lower support plate on the other side of the lower mold. A first pin sleeve 31 is provided at the upper end of the lower support rod. The upper support rod is vertically fixed to the bottom of the upper support plate on the other side of the upper mold. A second pin sleeve 33 is provided at the lower end of the upper support rod. The first pin sleeve is connected to the second pin sleeve through a limiting pin. A cutting tool 34 is also rotatably connected to the lower support plate. When closing the mold, the upper mold is first moved to the top of the lower mold by the cooperation of the limiting pin, the first pin sleeve, and the second pin sleeve. Then, the lifting cylinder is activated to close the upper mold and the lower mold. After the mold is closed, the lifting cylinder is activated to lift the entire injection mold, so that the injection nozzle passes through the through groove of the upper support plate and extends into the injection hole at the top of the upper mold. The present invention has a cutting tool on the lower support plate, which can directly separate the one-time injection molded cylindrical flame retardant cover and the flame retardant cap head cover without the need for subsequent cutting processing, which is very convenient.

[0049] The upper and lower molds of this invention are made of one of the following materials: PET, PS, PE, PC, PP, PVC or ABS. Existing injection molds are often made of metal, which is very troublesome to demold, and sometimes too much force can damage the structure of the flame retardant cover assembly. The injection molds of this invention, made of the above materials, can facilitate demolding.

[0050] like Figure 2 Two mixing devices are installed at the top of the lower end of the Z-shaped support shown, with the two mixing devices placed one in front of the other. The pumping system is connected to the two mixing devices respectively through a reversing valve assembly. The storage tank assembly is composed of several storage tanks, which are mounted on the top of the support platform through a weighing assembly. A discharge port is provided on the side wall at the lower end of the mixing device, and the discharge port is connected to the injection pipe through an injection switching valve.

[0051] like Figure 2 and Figure 5 A water circulation heating device is connected to the outer wall of the injection molding pipe shown. The water circulation heating device includes a heating cover assembly and a heating water tank 35. The heating cover assembly is composed of an upper cover 36-1 and a lower cover 36-2 connected together. The lower cover is fixed to a Z-shaped bracket. Heating grooves matching the injection molding pipe are formed at the bottom of the upper cover and the top of the lower cover. Heating cavities are formed in the side walls of the upper and lower covers, and these cavities are connected to the heating water tank via circulation pipes. The heating water tank is equipped with a temperature sensor and an electric heating wire. The water inlets of both the upper and lower covers are located at the top, and the water outlets are located on the side walls at the bottom. This invention provides a water circulation heating device on the outside of the injection molding pipe. This device prevents the raw materials inside the injection molding pipe from solidifying when injection stops, reducing unnecessary losses and increasing practicality.

[0052] like Figure 2 and Figure 5 The bottom of the Z-shaped bracket shown is provided with a collection cover placement ring, and a waste liquid collection cover 37 is detachably connected inside the collection cover placement ring. The waste liquid collection cover is connected to the waste liquid collection box 38 set on the support plate through a pipe.

[0053] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A method of making a flame shield assembly for high temperature protection of a bolt, the method comprising: It comprises the following steps: ​ S1: batching: the injection molding raw materials are sent into the mixing device of the injection molding machine according to the proportion through the pumping system; S2: heating and mixing: the heating system in the mixing device is started, and the injection molding raw materials are heated and mixed in the mixing device by using the stirring mechanism; S3: injection pipeline heating: the water circulation heating device wrapped outside the injection pipeline is started to heat the injection pipeline by using the water circulation heating device; S4: injection molding: the injection nozzle is inserted into the injection hole of the injection mold, the pressurization system connected with the mixing device is started, and the mixed raw materials enter the injection mold along the injection nozzle by pressurization, so that a group of cylindrical flame-retardant covers and cap head flame-retardant covers are injection molded together each time; S5: demolding: the injection mold is opened, the cylindrical flame-retardant cover and the cap head flame-retardant cover are taken out of the injection mold, and the cutting tool arranged on the injection mold is used to separate the cylindrical flame-retardant cover from the cap head flame-retardant cover; S6: polishing: the outer wall of the cylindrical flame-retardant cover and the cap head flame-retardant cover is polished by using the polishing machine, and the excess flash on the cylindrical flame-retardant cover and the cap head flame-retardant cover is removed, and the polished cylindrical flame-retardant cover and cap head flame-retardant cover are stored in the warehouse; S7: pressure washing: after a batch of cylindrical flame-retardant covers and cap head flame-retardant covers are injection molded, the waste liquid collecting cover is connected with the injection nozzle, the water pump connected with the water circulation heating device is opened, hot water is injected into the mixing device, and the pressurization system is continuously opened, so that the internal passages of the injection pipeline and the injection nozzle are washed by hot water for reuse.

2. A method of making a flame shield assembly for high temperature protection of a bolt according to claim 1, characterized in that: The injection molding machine in the step S1 is composed of a workbench plate, a supporting plate, an injection mold, a mold mounting rotating seat, a fixing seat, a Z-shaped support, an injection nozzle and a mixing device, the workbench plate is connected above the supporting plate through a supporting rod, the fixing seat is arranged on the top of the left end of the workbench plate, the mold mounting rotating seat is in the shape of a circular table, a groove matched with the mold mounting rotating seat is formed in the top of the fixing seat, the mold mounting rotating seat is rotatably connected in the groove and connected with a rotary driving mechanism, two injection molds are fixed on the top of the mold mounting rotating seat, the mixing device is fixed on the top of the workbench plate through the Z-shaped support, the mixing device is arranged on the lower end face of the Z-shaped support and located above the right end of the workbench plate, the upper end of the Z-shaped support extends above the right end of the mold mounting rotating seat, the injection nozzle is arranged on the bottom surface of the upper end of the Z-shaped support and connected with the mixing device through an injection pipeline, the mixing device is connected with a pressurization system and a storage tank assembly arranged on the supporting plate through a pumping system.

3. A method of making a flame shield assembly for high temperature protection of a bolt according to claim 2, wherein: The rotary driving mechanism comprises a servo motor, a driving gear and an outer gear, the upper end of the mold mounting rotating seat extends out of the groove, the outer gear is sleeved on the outer wall of the upper end of the mold mounting rotating seat, the servo motor is mounted on the outer wall of the fixing seat, and the driving gear is sleeved on the output shaft of the servo motor and engaged with the outer gear.

4. A method of making a flame shield assembly for high temperature protection of a bolt according to claim 2, wherein: The injection mold comprises a mold mounting plate, a lower support plate, an upper support plate, an upper mold, a lower mold, a jacking cylinder, a jacking column, a guide cylinder, a transmission plate, a U-shaped support seat, a support lower rod, a support upper rod, a support shaft, an upper connecting rod and a limiting pin shaft, the lower support plate is connected at the top of the mold mounting rotating seat through the mold mounting plate, the bottom of the mold mounting plate is provided with a plurality of guide columns which are integrated with the mold mounting plate, a first guide hole is formed at the top of the mold mounting rotating seat relative to the position of the guide column, the bottom of the workbench plate is provided with a lifting cylinder, the lifting cylinder is located directly below the right end of the mold mounting rotating seat, a first through hole is formed on the workbench plate relative to the position of the shaft end of the lifting cylinder, a second through hole is formed on the bottom of the fixed seat relative to the position of the first through hole, two third through holes are formed on the mold mounting rotating seat below the two mold mounting plates relative to the position of the second through hole, the shaft end of the lifting cylinder sequentially passes through the first through hole, the second through hole and the third through hole and contacts the mold mounting plate, the upper mold is fixed at the bottom of the upper support plate, the jacking cylinder is fixed on the lower support plate, the shaft end of the jacking cylinder is connected with the transmission plate, a guide cylinder is fixed on the lower support plate on the left and right sides of the jacking cylinder, a jacking column matched with the guide cylinder is movably connected in the guide cylinder, the upper end of the jacking column is connected with the top of the lower mold, a notch is formed on the side wall of the guide cylinder, the two ends of the transmission plate extend into the guide cylinder along the notch and are connected with the lower end of the jacking column, the transmission plate can slide up and down along the notch under the action of the jacking cylinder, the support shaft is horizontally rotatably connected between the two side walls of the U-shaped support seat, the U-shaped support seat is fixed on the lower support plate on one side of the lower mold, the upper connecting rod is fixed at the bottom of the upper support plate on one side of the upper mold, the upper support plate is connected with the support shaft through the upper connecting rod, the upper connecting rod can rotate around the support shaft, the support lower rod is vertically fixed on the top of the lower support plate on the other side of the lower mold, the upper end of the support lower rod is provided with a first pin shaft sleeve, the support upper rod is vertically fixed on the bottom of the upper support plate on the other side of the upper mold, the lower end of the support upper rod is provided with a second pin shaft sleeve, the first pin shaft sleeve is connected with the second pin shaft sleeve through the limiting pin shaft, and the cutting tool is rotatably connected on the lower support plate.

5. A method of making a flame shield assembly for high temperature protection of a bolt according to claim 4, wherein: The upper mold and the lower mold are made of one of PET, PS, PE, PC, PP, PVC or ABS.

6. A method of making a flame shield assembly for high temperature protection of a bolt according to claim 2, wherein: The top of the lower end of the Z-shaped support is provided with two mixing devices, the two mixing devices are placed in front of and behind each other, the pump system is connected with the two mixing devices in communication through the reversing valve assembly, the storage tank assembly is composed of a plurality of storage tanks, the storage tanks are arranged on the top of the support table plate through the weighing assembly, the side wall of the lower end of the mixing device is provided with a discharge port, and the discharge port is connected with the injection pipe in communication through the injection switch valve. The upper mold and the lower mold are made of one of PET, PS, PE, PC, PP, PVC or ABS. The top of the lower end of the Z-shaped support is provided with two mixing devices, the two mixing devices are placed in front of and behind each other, the pump system is connected with the two mixing devices in communication through the reversing valve assembly, the storage tank assembly is composed of a plurality of storage tanks, the storage tanks are arranged on the top of the support table plate through the weighing assembly, the side wall of the lower end of the mixing device is provided with a discharge port, and the discharge port is connected with the injection pipe in communication through the injection switch valve.

7. A method of making a flame shield assembly for high temperature protection of a bolt according to claim 6, wherein: The outer wall of the injection pipe is connected with a water circulation heating device, which comprises a heating cover assembly and a heating water tank.

8. A method of making a flame shield assembly for high temperature protection of a bolt according to claim 2, characterized in that: The bottom of the Z-shaped support is provided with a collection cover placing ring, and a waste liquid collection cover is detachably connected in the collection cover placing ring.

9. A flame shield assembly for high temperature protection of a bolt, characterized by: The application relates to a fireproof cover for a bolt, which comprises a cylindrical fireproof cover and a cap head fireproof cover, the cylindrical fireproof cover is sleeved outside a bolt thread sleeve, the inner diameter of the cylindrical fireproof cover is larger than the outer diameter of the bolt thread sleeve, the cap head fireproof cover is sleeved outside a bolt nut rotating part, the cap head fireproof cover is connected with the bolt nut rotating part through cooperation, the bolt nut rotating part is connected with the bolt thread sleeve in an up-down integrated mode, and the cylindrical fireproof cover is compressed and limited through cooperation of the cap head fireproof cover and the bolt nut rotating part.

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