A method for embedding an iron plate in an xps foam board

Abstract

The application discloses a method for pre-embedding an iron plate in an XPS foam board, comprising the following steps: S1, marking a pre-embedding position of the iron plate on a surface of the XPS foam board; S2, placing the iron plate in a heating device and heating the iron plate to a temperature T; S3, picking up the heated iron plate by a displacement tool and moving the iron plate to the pre-embedding position, the iron plate being hot-melted and fused with the XPS foam board at the pre-embedding position, the displacement tool being provided with a limiting surface for limiting the pre-embedding depth of the iron plate; and S4, separating and moving away the displacement tool from the iron plate after the iron plate is hot-melted and fused with the XPS foam board. The method for pre-embedding the iron plate does not need to use a milling machine, reduces the time for adjusting the milling machine, can avoid the harm of dust and noise to the environment and human bodies, and specially designs the displacement tool and the heating device, so that the work efficiency can be greatly improved.

Description

Technical Field

[0001] This invention relates to the field of fiberglass composite board manufacturing technology, and in particular to a method for embedding iron plates in XPS foam boards. Background Technology

[0002] Extruded polystyrene (XPS) foam fiberglass composite panels are widely used in the field of refrigerated truck technology due to their excellent thermal insulation properties. These panels consist of XPS foam boards and fiberglass reinforced plastic (FRP) adhesive bonded to the outside of the XPS foam boards. Due to the needs of cargo box and equipment installation, iron plates of varying sizes and thicknesses need to be embedded in the XPS foam boards. To ensure that the surface of the iron plates does not protrude from the foam surface, this requires grooving and perforation operations on the XPS foam boards.

[0003] Traditional grooving and insertion processes utilize routing machines and vacuum grinders. First, lines are drawn on the surface of the XPS foam board. Then, the height of the routing machine cutter is adjusted according to the foam thickness and the required milling depth to cut the foam at the location of the iron plate. Finally, the iron plate is bonded to the foam with special adhesive. This method of pre-embedding the iron plate has the following drawbacks:

[0004] 1. The milling machine needs to be adjusted frequently because the thickness of the iron plate (1mm~8mm) is uneven, and the thickness of the foam body is also varied, which results in frequent modification of the milling machine parameters, which is labor-intensive and time-consuming.

[0005] 2. Manual operation cannot accurately control the area and depth of milling. The milled grooves cannot be milled into right angles at the four corners, but have an arc of about R5. It is necessary to manually repair them with a utility knife later. In addition, the difference in depth between the foam body and the iron plate body causes uneven depths, which requires secondary manual processing later.

[0006] 3. The foam splashes generated by milling, although there are adsorption devices, cannot be completely absorbed, which has a great impact on the surrounding environment;

[0007] 4. The noise level during the milling process reaches 110 decibels, which will have an adverse effect on the health of the operators and on-site communication. Summary of the Invention

[0008] This application provides a method for embedding iron plates in XPS foam boards, which solves the problems that exist in traditional methods of using a milling machine to drill holes and grooves on the surface of foam boards.

[0009] This application provides a method for embedding an iron plate in XPS foam board, including the following steps:

[0010] S1: Mark the embedded position of the iron plate on the surface of the XPS foam board;

[0011] S2: Place the iron plate in a heating device and heat the iron plate to a temperature T;

[0012] S3: The heated iron plate is picked up by the displacement fixture and moved to the pre-embedded position. The iron plate is heat-fused with the XPS foam board at the pre-embedded position. The displacement fixture has a limiting surface, which limits the pre-embedded depth of the iron plate.

[0013] S4: After the iron plate and the XPS foam board are heat-fused together, the displacement fixture is separated from the iron plate and removed.

[0014] The beneficial effects of the above embodiments are as follows:

[0015] Based on the above embodiments, the embodiments of this application can be further improved as follows: This method of pre-embedding iron plates does not require the use of a milling machine, which reduces the time for adjusting the milling machine, and can also avoid the harm of dust and noise to the environment and human body. Furthermore, a special displacement fixture and heating equipment have been designed specifically to greatly improve work efficiency.

[0016] In one embodiment of this application: In step S1, the iron plate to be embedded is placed on the surface of the XPS foam board, and at least one positioning point is drawn according to the iron plate. The advantage of this step is that only the positioning points need to be drawn to position the iron plate, eliminating the need to draw the outline of the iron plate, thus improving work efficiency.

[0017] In one embodiment of this application, the temperature T is 150–180°C.

[0018] In one embodiment of this application: the displacement fixture includes: a limiting member A, with a plane A at its lower end, the plane A being used for contact and positioning with the surface of the XPS foam board; a limiting member B, arranged parallel to the limiting member A and with a gap between them, the limiting member B having a plane B at its lower end, the plane B being flush with the plane A, the plane B being used for contact and positioning with the surface of the XPS foam board; and a magnetic suction member, disposed in the gap and connected to the limiting member A and the limiting member B respectively, the magnetic suction member being used to attract the iron plate to fit against the planes A and B; wherein the area of ​​the planes A and B is larger than the area of ​​the attracted iron plate. The beneficial effect of this step is that by limiting the iron plate with planes A and B at the lower end of the displacement fixture, the iron plate will not sink further into the XPS foam board when it is heated to be flush with the surface of the XPS foam board, thus better ensuring the flatness of the XPS foam board surface.

[0019] In one embodiment of this application: the limiting member A and the limiting member B are symmetrical about the plane at the middle position of the gap. The limiting member A includes: a vertical plate connected to the magnetic suction member, the vertical plate having a hole communicating with the gap, the hole being adjacent to the switch of the magnetic suction member; a bottom plate connected to the bottom end of the vertical plate, with a notch A corresponding to the magnetic suction member, the lower end of the magnetic suction member being located in the notch A; and a top plate connected to the top end of the vertical plate, with a notch B, the notch B being adjacent to the switch of the magnetic suction member. The beneficial effects of this step are: by using the hole and notch B, the operator can operate the switch from the side and above, thereby improving the usability of this displacement fixture; by setting notch A, the magnetic suction end of the switch-type magnetic base is prevented from being blocked, allowing the magnetic suction end to be closer to the iron plate, thus improving the magnetic suction efficiency of the switch-type magnetic base.

[0020] In one embodiment of this application, the heating device includes a heating plate and a protective cover, the protective cover being disposed around the heating portion of the heating plate. The beneficial effect of this step is that the protective cover improves the thermal energy utilization rate of the heating plate and reduces the amount of heat loss into the surrounding space.

[0021] In one embodiment of this application: the protective cover includes: a barrier surrounding the heating plate; a heat insulation body A connected to the inner side of the barrier and surrounding the heating plate; a cover plate hinged to the barrier, the cover plate having a groove on the side facing the barrier; a heat insulation body B filling the groove; and a positioning member connected to the cover plate and supporting and limiting the heat insulation body B within the groove; wherein, when the cover plate is placed over the upper end of the barrier, the heat insulation body B and the heat insulation body A form a heat insulation structure around and above the heating plate. The beneficial effect of this step is that by surrounding and above the heating portion of the heating plate with heat insulation bodies A and B, heat loss into the external space is prevented.

[0022] In one embodiment of this application: the protective cover further includes: a support frame, with legs arranged around the support frame, the legs being located outside the heating plate, and the enclosure connected to the support frame, the legs supporting the enclosure above the control panel of the heating plate. The beneficial effect of this step is: to prevent the enclosure from interfering with the control of the heating plate.

[0023] In one embodiment of this application, the cover further includes a positioning component disposed between the support frame and the cover plate. The positioning component is used to position the cover plate against the support frame when the cover plate is in the open state. The beneficial effect of this step is that the positioning component improves the stability of the cover plate's positioning when it is in the open state.

[0024] In one embodiment of this application: the positioning component includes: a positioning plate connected to the cover plate and having a positioning groove; a limiting seat connected to the support frame and having a sliding groove; a limiting member slidably disposed in the sliding groove; and an elastic member disposed in the sliding groove and applying a spring force to the limiting member toward the outside of the sliding groove; wherein, when the cover plate is flipped to the open position, the limiting member enters the positioning groove under the spring force of the elastic member. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0026] Figure 1 A schematic diagram of a structure in which an iron plate is embedded in XPS foam board;

[0027] Figure 2 Schematic diagram of the displacement tooling Figure 1 ;

[0028] Figure 3 Schematic diagram of the displacement tooling Figure 2 ;

[0029] Figure 4 This is a schematic diagram of the heating equipment.

[0030] Figure 5 This is a schematic diagram of the cover plate structure;

[0031] Figure 6 This is a schematic diagram of the fence structure;

[0032] Figure 7 This is a schematic diagram of the positioning component.

[0033] Among them, 1-XPS foam board;

[0034] 2-Iron plate;

[0035] 3-Heating equipment, 301-Electric heating plate, 302-Protective cover, 303-Enclosure, 304-Insulation body A, 305-Cover plate, 306-Insulation body B, 307-Positioning component, 308-Support frame, 309-Positioning assembly, 310-Positioning plate, 311-Limiting seat, 312-Limiting component, 313-Elastic component, 314-Positioning groove;

[0036] 4-Displacement fixture, 401-Limiting component A, 402-Limiting component B, 403-Magnetic suction component, 404-Plane A, 405-Plane B, 406-Upright plate, 407-Bottom plate, 408-Top plate, 409-Hole, 410-Notch A, 411-Notch B, 412-Holding component, 413-Vertical rod, 414-Horizontal rod, 415-Anti-loosening component. Detailed Implementation

[0037] In this application, unless otherwise explicitly specified and limited, terms such as installation, connection, linking, fixing, and fastening should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, in which appropriate connection methods can be selected from existing technologies, such as welding, riveting, threaded connection, bonding, pin connection, key connection, elastic deformation connection, snap-fit ​​connection, interference fit connection, and injection molding to achieve structural connection; they can also refer to an electrical connection, transmitting energy or signals electrically; they can refer to a direct connection or an indirect connection through an intermediate medium, and can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0038] A method for embedding iron plates in XPS foam boards, such as Figure 1 , 4 As shown, it includes the following steps:

[0039] S1: Mark the pre-embedded position of the iron plate 2 on the surface of XPS foam board 1;

[0040] S2: Place the iron plate 2 in the heating device 3 and heat the iron plate 2 to temperature T;

[0041] S3: The displacement fixture 4 picks up the heated iron plate 2 and moves the iron plate 2 to the pre-embedded position. The iron plate 2 is heat-fused with the XPS foam board 1 at the pre-embedded position. The displacement fixture 4 has a limiting surface, which limits the pre-embedded depth of the iron plate 2.

[0042] S4: After the iron plate 2 and the XPS foam board 1 are heat-fused together, the displacement fixture 4 is separated from the iron plate 2 and removed.

[0043] In one embodiment, in step S1, the iron plate 2 to be embedded is placed on the surface of XPS foam board 1 at the pre-embedded position, and at least one positioning point is drawn according to the iron plate. Since the iron plate 2 is a quadrilateral, the positioning point can be the sharp corner of the iron plate 2. By drawing the positioning point with the iron plate, it is not necessary to draw the outline of the iron plate 2, which achieves the effect of saving time.

[0044] In one embodiment, the temperature T is 150-180°C. After the iron plate 2 is heated, the surface of the XPS foam board 1 can be melted to create a groove for placing the iron plate 2.

[0045] In one embodiment, in step S4, after the iron plate 2 has cooled to room temperature, the displacement fixture 4 is removed.

[0046] like Figure 2 , 3 As shown, in one embodiment, the displacement fixture 4 includes: a limiting member A401, a limiting member B402, and a magnetic suction member 403. The lower end of the limiting member A401 has a plane A404, which is used for contacting and positioning with the surface of the XPS foam board 1. The limiting member B402 is arranged parallel to the limiting member A401 and has a gap with it. The lower end of the limiting member B402 has a plane B405, which is flush with the plane A404 and is used for contacting and positioning with the surface of the XPS foam board 1. Plane A404 and plane B405 together form a limiting surface. Magnetic suction component 403 is disposed in the gap and connected to limiting component A401 and limiting component B402 respectively. Magnetic suction component 403 is used to attract iron plate 2 to fit with plane A404 and plane B405. The area of ​​plane A404 and plane B405 is larger than the area of ​​the attracted iron plate 2. Thus, by using plane A404 and plane B405, the purpose of positioning iron plate 2 at the lower end of displacement fixture 4 can be achieved, and the purpose of positioning iron plate 2 can also be achieved during hot melt bonding.

[0047] In one embodiment, the magnetic attractor 403 is a switchable magnetic base. The two sides of the switchable magnetic base are connected to the limiting member A401 and the limiting member B402 respectively through connecting members. The connecting members are bolts. The limiting member A401 and the limiting member B402 are symmetrical about the plane at the middle position of the gap. That is, the limiting members A401 and B402 on both sides of the magnetic attractor 403 form a mirror symmetrical structure on both sides of the switchable magnetic base. Therefore, the following description focuses on the limiting member A401, and the limiting member B402 will not be described in too many repetitive details.

[0048] like Figure 2 , 3As shown, in one embodiment, the limiting member A401 includes: a vertical plate 406, a bottom plate 407, and a top plate 408. The vertical plate 406 is connected to the magnetic attractor 403. The vertical plate 406 has a hole 409 communicating with the gap. The hole 409 is adjacent to the switch of the magnetic attractor 403. The bottom plate 407 is connected to the bottom end of the vertical plate 406 and has a notch A410 corresponding to the magnetic attractor 403. The lower end of the magnetic attractor 403 is located in the notch A410. The top plate 408 is connected to... At the top of the upright plate 406, the top plate 408 is provided with a notch B411. The notch B411 is adjacent to the switch of the magnetic suction component 403. By setting the hole 409, it is convenient for the operator to operate the switch from the side. By setting the notch B411, it is convenient for the operator to operate the switch from above. By setting the notch A410, it is prevented from blocking the magnetic suction end of the switch-type magnetic base, so that the magnetic suction end can be closer to the iron plate 2, thereby improving the magnetic suction efficiency of the switch-type magnetic base.

[0049] like Figure 2 As shown, in one embodiment, the magnetic suction tooling further includes a gripper 412, which is connected to the magnetic suction member 403, and the upper end of the gripper 412 has a gripping end arranged in a transverse direction.

[0050] like Figure 2 As shown, in one embodiment, the gripper 412 specifically includes: a vertical rod 413, a horizontal rod 414, and an anti-loosening component 415. The horizontal rod 414 forms the gripping end. The vertical rod 413 is arranged vertically, and the horizontal rod 414 is arranged horizontally and connected to the upper end of the vertical rod 413. The lower end of the vertical rod 413 is a screw structure, and the lower end of the vertical rod 413 is threadedly connected to the upper end of the switch-type magnetic base. The horizontal rod 414 is located above the limiting member A401 and the limiting member B402, and the ends of the horizontal rod 414 extend towards the outside of the limiting member A401 and the outside of the limiting member B402, respectively. By setting the horizontal rod 414, it is convenient for the operator to lift and lower the magnetic tool. The anti-loosening component 415 is connected to the vertical rod 413 and pressed against the upper end face of the switch-type magnetic base. The anti-loosening component 415 is a nut, and there are two nuts that are threadedly connected to the vertical rod 413. The two nuts are pressed against each other.

[0051] like Figure 4 , 5 As shown, in one embodiment, the heating device 3 includes: an electric heating plate 301 and a protective cover 302, the protective cover 302 covering the heating part of the electric heating plate 301.

[0052] like Figure 4 , 5As shown in Figure 6, in one embodiment, the protective cover 302 includes: a barrier 303, a heat insulation body A304, a cover plate 305, a heat insulation body B306, and a positioning member 307. The barrier 303 is disposed around the heating plate 301. The heat insulation body A304 is connected to the inner side of the barrier 303 and surrounds the heating plate 301. The cover plate 305 is hinged to the barrier 303. The side of the cover plate 305 facing the barrier 303 has a groove. The heat insulation body B306 is filled in the groove. The positioning member 307 is connected to the cover plate 305 and supports and confines the heat insulation body B306 in the groove. When the cover plate 305 is placed on the upper end of the barrier 303, the heat insulation body B306 and the heat insulation body A304 form a heat insulation structure around and above the heating plate 301.

[0053] like Figure 4 As shown, in one embodiment, the protective cover 302 further includes: a support frame 308, with legs arranged around the support frame 308, the legs being located outside the heating plate 301, and a barrier 303 connected to the support frame 308, the legs supporting the barrier 303 above the control panel of the heating plate 301, thereby preventing the barrier 303 from interfering with the control of the heating plate 301.

[0054] like Figure 4 As shown, in one embodiment, the cover 302 further includes a positioning component 309, which is disposed between the support frame 308 and the cover plate 305. The positioning component 309 is used to position the cover plate 305 on the support frame 308 when the cover plate 305 is in the open state, thereby improving the stability of the positioning of the cover plate 305 when it is in the open state.

[0055] like Figure 7 As shown, in one embodiment, the positioning component 309 includes: a positioning plate 310, a limiting seat 311, a limiting member 312, and an elastic member 313. The positioning plate 310 is connected to the cover plate 305 and has a positioning groove 314. The limiting seat 311 is connected to the support frame 308 and has a sliding groove. The limiting member 312 is slidably disposed in the sliding groove. The elastic member 313 is disposed in the sliding groove and applies a spring force to the limiting member 312 to move outward toward the sliding groove. When the cover plate 305 is flipped to the open position, the limiting member 312 enters the positioning groove 314 under the action of the spring force of the elastic member 313.

[0056] like Figure 4 , 7As shown, in one embodiment, the cover plate 305 is hinged to the crossbar 414 at the upper end of the support frame 308 via a hinge. Since the enclosure 303 is connected to the support frame 308, the cover plate 305 is also equivalent to being hinged to the enclosure 303. Each cover plate 305 is equipped with two hinges. The positioning plate 310 and the limiting seat 311 are located on the hinges. The limiting element 312 is a ball bearing, the elastic element 313 is a compression spring, and the slide groove has a through-hole structure. One end of the slide groove has an internal thread and is closed by a threaded component. The threaded component can be a plug, bolt, screw, or... For threaded parts such as studs, the other end of the slide groove is an arc-shaped groove wall that matches the shape of the ball. The arc-shaped groove wall limits the ball, allowing part of the ball structure to extend to the outside of the slide groove, while the remaining structure of the ball is confined in the slide groove by the arc-shaped groove wall. The positioning groove 314 on the side of the positioning plate 310 is an arc-shaped structure. The center of the positioning groove 314 has an arc groove that matches the shape of the ball. The arc-shaped structure of the positioning groove 314 makes it easier for the ball to enter the positioning groove 314, and the arc groove is used to improve the stability of the ball positioning.

[0057] In one embodiment, both heat insulation body A304 and heat insulation body B306 include: heat insulation cotton and fireproof cloth, with the fireproof cloth wrapped around the outside of the heat insulation cotton.

[0058] In one embodiment, the heat insulation body A304 can be connected to the inner wall of the enclosure 303 by means of bolts and washers or by bonding. The enclosure 303 includes a top plate 408 and side plates. The top plate 408 is located at the upper end of the side plates. The heat insulation body A304 is connected between the top plate 408 and the side plates. The structure of the enclosure 303 limits the position of the heat insulation body A304, so that the heat insulation body A304 forms a structure covering the perimeter and edge of the heating part of the heating plate 301, thereby improving the heat preservation and heat insulation performance. The inner perimeter of the cover plate 305 has a frame. The heat insulation body B306 is filled in the area surrounded by the frame. The positioning member 307 is a plate-shaped structure. Several positioning members 307 are connected between the frame at intervals. The positioning members 307 support the heat insulation body B306, improve the positioning stability of the heat insulation body B306, and prevent the heat insulation body B306 from falling out of the cover plate 305.

[0059] In one embodiment, a handle is provided on the side of the cover plate 305 away from the hinge, which facilitates manual rotation of the cover plate 305.

[0060] This method of embedding iron plate 2 into XPS foam board 1 has the following advantages:

[0061] 1. A dedicated displacement fixture 4 and heating equipment 3 are designed for the new method of pre-embedded iron plates, which can greatly improve work efficiency;

[0062] 2. No need to use a routing machine, reducing the time spent adjusting the routing machine. At the same time, only the positioning points need to be drawn to position the iron plate 2, without the need to draw the outline of the iron plate 2. Therefore, it can improve work efficiency and avoid the harm of dust and noise to the environment and human body.

[0063] 3. By using the electric heating plate 301, multiple iron plates 2 can be preheated at one time, which has high heating efficiency and saves time;

[0064] 4. The heated iron plate 2 is moved by the displacement fixture 4, which is convenient to operate. The plane A404 and plane B405 at the lower end of the displacement fixture 4 limit the iron plate 2 so that it will not sink further into the XPS foam board 1 when it is heated to be flush with the surface of the XPS foam board 1, which can better ensure the flatness of the XPS foam board 1 surface.

[0065] 5. Reduces the number of adhesive bonding steps and ensures a strong bond. In the traditional method of embedding iron plates, structural adhesive is needed to bond the iron plate 2 to the foam at the contact point, which is time-consuming, laborious, and the adhesive cannot fill the gaps completely, resulting in local hollow areas. The new method uses the high temperature of the iron plate 2 to partially melt the XPS foam board 1. The molten foam is tightly bonded to the iron plate 2 without gaps, and the molten foam is firmly bonded to the iron plate 2.

[0066] The above are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A method of embedding a metal plate in an XPS foam board, characterized in that, The method comprises the following steps: S1: marking the pre-embedded position of the iron plate on the surface of the XPS foam board; S2: placing the iron plate in a heating device and heating the iron plate to a temperature T; S3: picking up the heated iron plate by a displacement tool and moving the iron plate to the pre-embedded position, the iron plate being hot-welded with the XPS foam board at the pre-embedded position, the displacement tool being provided with a limiting surface for limiting the pre-embedded depth of the iron plate; S4: separating and moving away the displacement tool from the iron plate after the iron plate is hot-welded with the XPS foam board; The displacement tool comprises: a limiting member A, the lower end of which is provided with a plane A for contacting and positioning the surface of the XPS foam board; a limiting member B, which is arranged in parallel with the limiting member A and has a gap between the limiting member A and the limiting member B, the lower end of the limiting member B being provided with a plane B flush with the plane A, the plane B being used for contacting and positioning the surface of the XPS foam board; a magnetic member arranged in the gap and connected with the limiting member A and the limiting member B respectively, the magnetic member being used for attracting the iron plate to the planes A and B; wherein the areas of the planes A and B are larger than the area of the attracted iron plate; the limiting member A and the limiting member B are symmetrical structures with the planes in the middle of the gap, and the limiting member A comprises: a vertical plate connected with the magnetic member, the vertical plate being provided with a hole body in communication with the gap, the hole body being adjacent to the switch of the magnetic member; a bottom plate connected to the bottom end of the vertical plate, the bottom plate being provided with a notch A corresponding to the magnetic member, the lower end of the magnetic member being located in the notch A; a top plate connected to the top end of the vertical plate, the top plate being provided with a notch B adjacent to the switch of the magnetic member; the heating device comprises an electric heating plate and a protective cover, the protective cover being arranged around the heating part of the electric heating plate; the protective cover comprises: a fence arranged around the electric heating plate; a heat insulating body A connected to the inner side of the fence and surrounding the electric heating plate; a cover plate hinged to the fence, one side of the cover plate towards the fence being provided with a groove; a heat insulating body B filled in the groove; a positioning member connected to the cover plate and supporting the heat insulating body B in the groove; when the cover plate is arranged on the upper end of the fence, the heat insulating body B and the heat insulating body A form a heat preservation structure around the electric heating plate and the upper end.

2. The method of claim 1, wherein, In the step S1, the iron plate to be pre-embedded is placed on the surface of the XPS foam board, and at least one positioning point is drawn according to the iron plate.

3. The method of claim 1, wherein, The temperature T is 150-180℃.

4. The method of claim 1, wherein, The protective cover further comprises: a support frame, the support frame being provided with support legs around, the support legs being located outside the electric heating plate, the fence being connected to the support frame, and the support legs supporting the fence above the control panel of the electric heating plate.

5. The method of claim 4, wherein, The protective cover further comprises: a positioning assembly arranged between the support frame and the cover plate, the positioning assembly being used for positioning the cover plate on the support frame when the cover plate is in an open state.

6. The method of claim 5, wherein, The positioning assembly comprises: A positioning plate is connected to the cover plate and has a positioning slot; A limiting seat is connected to the support frame and has a sliding slot; A limiting member is slidingly arranged in the sliding slot; An elastic member is arranged in the sliding slot and applies an elastic force to the limiting member to move towards the outside of the sliding slot; When the cover plate is turned to an open position, the limiting member enters the positioning slot under the elastic force of the elastic member.

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