A preheating device and method for offline preheating of a mold

Abstract

The present invention relates to a preheating device and method for offline preheating of a mold. The preheating device includes: a mold separation device, which is provided with a frame, the frame is provided with a bottom plate, a lifting assembly is connected to the bottom plate, the upper end of the lifting assembly is connected to a placement platform for placing the mold, the upper end of the frame is connected to a limiting assembly, and the limiting assembly is arranged between the upper mold part and the lower mold part of the mold; a mold preheating device; which is provided with a horizontal movement assembly, one side of the horizontal movement assembly is connected to a heating assembly for preheating the mold, and the horizontal movement assembly is used to drive the heating assembly to move between the upper mold part and the lower mold part of the mold. The present invention preheats the upper and lower parts of the mold simultaneously through the preheating device, completes the mold preheating without occupying the forging press, and the mold can be directly started for production operations after the mold preheating is completed, solving the problem of long production auxiliary time and low production efficiency in the state of many product types and small batches.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of die design, and in particular, to a preheating device and method for offline preheating of a die. Background Art

[0002] The forging of the heel end of the special-shaped steel rail for turnouts is formed by a four-station die. Due to its structural characteristics and usage characteristics, it needs to be preheated every time it is used to prevent the die from cracking and failing under the action of thermal and cold stresses. At present, the die preheating method is to first install the four-station die tooling on the existing press, lift the upper die block by the press to separate the upper and lower dies, then move the preheating plate into the space between the upper and lower dies, and preheat the die through the thermal radiation of the heating tube. The preheating temperature is 200 - 300 °C, and the preheating time is 2 - 3 h, 2 h in summer and 3 h in winter. During the die preheating period, the operator is in a standby state, which severely restricts the production efficiency of the hot forging of the steel rail.

[0003] It increases with the increase in the variety of products, and the smaller the quantity per batch, the more serious the impact on production efficiency. According to the current production situation, there are more than 40 types of hot forging dies, and the production quantity per batch is relatively small, 10 - 20 pieces (the daily output is about 25 pieces). According to statistics, the production auxiliary time required for die preheating is 2 - 3 hours per day, which seriously affects production. Therefore, it is necessary to design a set of devices to conveniently and quickly complete the die preheating work without occupying the forging press. Generally, we define that the die installed on the forging press for preheating is online preheating, and the die preheated not on the forging press is offline preheating.

[0004] Regarding the above technical solution, the inventor found that there are at least the following technical problems:

[0005] Since the existing die preheating device takes a long time to preheat the die and occupies the forging press, when there are many types of products and small batches, it is necessary to frequently change the die types. It is impossible to complete the die preheating without occupying the forging press.

[0006] Therefore, it is necessary to improve one or more problems existing in the above related technical solutions.

[0007] It should be noted that this part aims to provide background or context for the technical solution of the present invention stated in the claims. The description here is not admitted to be prior art just because it is included in this part. Summary of the Invention

[0008] The purpose of the present invention is to provide a preheating device and method for offline preheating of a die, thereby at least to a certain extent solving one or more problems caused by the limitations and defects of the related technologies.

[0009] The present invention first provides a preheating device for offline preheating of a mold. The mold can be decomposed into an upper mold part and a lower mold part. The preheating device includes:

[0010] A mold separation device. The mold separation device is provided with a frame. The frame is provided with a bottom plate. A lifting component is connected to the bottom plate. The upper end of the lifting component is connected to a placement platform for placing the mold. The upper end of the frame is connected to a limiting component. The limiting component is arranged between the upper mold part and the lower mold part of the mold. Wherein, when the placement platform drives the mold to move downward through the lifting component, the limiting component restricts the downward movement of the upper mold part of the mold, so as to separate the upper mold part and the lower mold part of the mold.

[0011] A mold preheating device. The mold preheating device is provided with a horizontal movement component. A heating component for preheating the mold is connected to one side of the horizontal movement component facing the mold separation device. The horizontal movement component is used to drive the heating component to move between the upper mold part and the lower mold part of the mold.

[0012] In the present invention, the limiting component includes a plurality of limiting blocks. The plurality of limiting blocks are arranged in pairs on both sides of the frame, and each limiting block extends and retracts in the direction towards the mold. When the limiting block extends, the upper surface of the limiting block contacts the lower surface of the upper mold part.

[0013] In the present invention, the upper surface of the placement platform is provided with rollers for moving the mold in and out of the mold separation device.

[0014] In the present invention, guide sleeves are respectively arranged on both sides of the placement platform, and guide posts matching the guide sleeves are respectively arranged on both sides of the bottom plate of the frame. And the guide posts are arranged in the vertical direction and sleeved in the guide sleeves.

[0015] In the present invention, the placement platform is further provided with a positioning component. The positioning component is arranged on the upper surface of the rollers for positioning the placement position of the mold in the mold preheating device.

[0016] In the present invention, the horizontal movement component is provided with a horizontal guide rail and a vertical plate. The vertical plate is slidably connected to the horizontal guide rail through a first slider. The heating component is connected to one side of the vertical plate facing the mold separation device.

[0017] In the present invention, the mold preheating device is further provided with a vertical movement component. The vertical movement component is provided with a vertical guide rail. The vertical guide rail is fixedly connected to the side surface of the vertical plate. The heating component is slidably connected to the vertical guide rail through a second slider.

[0018] In the present invention, the heating assembly is provided with an outer frame, the upper surface of the outer frame is matched with the lower surface of the upper die part of the mold, and the lower surface of the outer frame is matched with the upper surface of the lower die part of the mold.

[0019] In the present invention, the heating assembly is provided with a plurality of heating tubes, and the plurality of heating tubes are arranged inside the outer frame and are arranged in two upper and lower layers.

[0020] In the present invention, the preheating device further includes: a loading and unloading device;

[0021] The loading and unloading device and the mold preheating device are respectively arranged on opposite sides of the mold separating device, and the loading and unloading device is used to transport the mold into the mold preheating device.

[0022] The present invention also provides a method for off-line preheating of a mold, and the mold is off-line preheated by using the preheating device for off-line preheating of a mold according to any one of the above embodiments.

[0023] The technical solution provided by the present invention may include the following beneficial effects:

[0024] In the present invention, the upper and lower parts of the mold are simultaneously off-line preheated by the preheating device, and the mold preheating is completed without occupying the forging press. After the mold preheating is completed, the mold can be directly started for production operations, thereby solving the problem of long production auxiliary time and low production efficiency in the state of multiple product types and small batches. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present invention and used together with the specification to explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0026] Figure 1 Showing a three-dimensional structural schematic diagram of the preheating device in an exemplary embodiment of the present invention;

[0027] Figure 2 Showing a three-dimensional structural schematic diagram of the mold separating device in an exemplary embodiment of the present invention;

[0028] Figure 3 Showing a longitudinal plane structural schematic diagram of the mold separating device in an exemplary embodiment of the present invention;

[0029] Figure 4 Showing a three-dimensional structural schematic diagram of the mold preheating device in an exemplary embodiment of the present invention;

[0030] Figure 5 Shows the lateral plane structure schematic diagram of the mold preheating device in an exemplary embodiment of the present invention;

[0031] Figure 6 Shows Figure 5 the sectional view A-A in;

[0032] Figure 7 Shows the lateral plane structure schematic diagram of the preheating equipment including the feeding and discharging device in an exemplary embodiment of the present invention.

[0033] Reference numerals: 100, mold; 110, upper mold part; 120, lower mold part; 200, mold separating device; 210, frame; 220, bottom plate; 221, guide post; 230, lifting assembly; 240, placing platform; 241, guide sleeve; 250, limiting assembly; 251, limiting block; 260, positioning assembly; 300, mold preheating device; 310, heating assembly; 311, outer frame; 312, heating tube; 320, horizontal moving assembly; 321, horizontal guide rail; 322, vertical plate; 323, first slider; 330, vertical moving assembly; 331, vertical guide rail; 332, second slider; 400, feeding and discharging device; 500, roller shaft. Detailed Description of the Invention

[0034] Now, the exemplary embodiments will be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this invention will be more complete and comprehensive, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0035] In addition, the accompanying drawings are only schematic illustrations of the embodiments of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repeated description will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0036] In this exemplary embodiment, a preheating equipment for offline preheating of the mold is first provided. Referring to Figure 1 and Figure 3 as shown, the mold 100 can be decomposed into an upper mold part 110 and a lower mold part 120. The preheating equipment includes: a mold separating device 200 and a mold preheating device 300.

[0037] Among them, the mold separating device 200 is provided with a frame 210. The frame 210 is provided with a bottom plate 220. A lifting assembly 230 is connected to the bottom plate 220. The upper end of the lifting assembly 230 is connected to a placement platform 240 for placing the mold 100. The upper end of the frame 210 is connected to a limiting assembly 250. The limiting assembly 250 is disposed between the upper mold part 110 and the lower mold part 120 of the mold 100. Among them, when the placement platform 240 drives the mold 100 to move downward through the lifting assembly 230, the limiting assembly 250 restricts the downward movement of the upper mold part 110 of the mold 100, so that the upper mold part 110 and the lower mold part 120 of the mold 100 are separated.

[0038] Among them, the mold preheating device 300 is provided with a horizontal moving assembly 320. On one side of the horizontal moving assembly 320 facing the mold separating device 200, a heating assembly 310 for preheating the mold 100 is connected. The horizontal moving assembly 320 is used to drive the heating assembly 310 to move between the upper mold part 110 and the lower mold part 120 of the mold 100.

[0039] It should be understood that the lifting assembly 230 can be set at the central position of the bottom plate 220. The lifting assembly 230 can adopt a hydraulic jack, whose fixed end is installed on the bottom plate 220, and whose movable end is connected to the lower surface of the placement platform 240. The frame 210 is a column connected to the periphery of the bottom plate 220.

[0040] It should also be understood that the mold preheating device 300 and the mold separating device 200 are arranged oppositely. The mold preheating device 300 is provided with a fixing frame, and other components such as the horizontal moving assembly 320 and the heating assembly 310 of the mold preheating device 300 are all arranged on the fixing frame.

[0041] It should also be understood that compared with traditional mold preheating equipment, only the area of the mold 100 that needs to be preheated is preheated, and the rest of the positions are not preheated, greatly reducing the preheating time and cost. On the other hand, a profiling heating box body is designed for the upper and lower mold parting surfaces, so that the upper mold, the heating box body, and the lower mold form a closed space, improving the heating efficiency.

[0042] Through the above preheating equipment, the upper and lower parts of the mold 100 are preheated offline at the same time. Without occupying the forging press, the mold 100 can be directly started for production operation after the preheating of the mold 100 is completed, thus solving the problem of long production auxiliary time and low production efficiency in the state of many product types and small batches.

[0043] Next, reference will be made to Figures 1 to 7 to describe each part of the above preheating equipment for offline preheating of the mold 100 in the exemplary embodiment in more detail.

[0044] In some embodiments, refer to Figures 1 to 3 As shown in Figures 1 to 3 , the limiting component 250 includes a plurality of limiting blocks 251. The plurality of limiting blocks 251 are arranged in pairs on both sides of the frame 210, and each limiting block 251 extends and retracts in the direction towards the mold 100. When the limiting block 251 extends, the upper surface of the limiting block 251 contacts the lower surface of the upper mold part 110. It should be understood that the frame 210 is a column connected to the periphery of the bottom plate 220. A limiting oil cylinder is provided at the upper end of each column, and a limiting block 251 is provided at the end of the piston rod of the oil cylinder. The limiting block 251 can move along the guiding block. After the limiting block 251 extends, its upper surface contacts the bottom surface of the upper template of the upper mold part 110, and limits the downward movement of the upper mold part 110 when the mold 100 is separated. And when the limiting block 251 retracts, it has no contact with the mold 100 at all, so as not to affect the movement of the mold 100 when entering and exiting the mold separating device 200.

[0045] In some embodiments, refer to Figure 2 As shown in Figure 2 , roller shafts 500 are arranged on the upper surface of the placement platform 240 for moving the mold 100 in and out of the mold separating device 200. It should be understood that a set of continuously arranged roller shafts 500 are arranged on the upper surface of the floating slider, which is convenient for the mold 100 to enter and exit the mold separating device 200. It is driven by a motor, and chains are connected between the motor and the roller shafts 500 and between the roller shafts 500. Thereby driving the rotation of the roller shafts 500 and driving the movement of the mold 100 in and out.

[0046] In some embodiments, refer to Figures 1 to 2 As shown in Figures 1 to 2 , guide sleeves 241 are respectively arranged on both sides of the placement platform 240, and guide posts 221 matching the guide sleeves 241 are respectively arranged on both sides of the bottom plate 220 of the frame 210, and the guide posts 221 are arranged in the vertical direction and sleeved in the guide sleeves 241. It should be understood that the placement platform 240 can be called a floating slider connected to the lifting component 230. Two guide sleeves 241 are respectively arranged on both sides of the floating slider, and the guide sleeves 241 cooperate with the guide posts 221 fixed on the bottom plate 220 to realize the precise up and down movement of the floating slider.

[0047] In some embodiments, refer to Figure 2 As shown in Figure 2 , the placement platform 240 is further provided with a positioning component 260. The positioning component 260 is arranged on the upper surface of the roller shafts 500 for positioning the placement position of the mold 100 in the mold preheating device 300. It should be understood that the positioning component 260 includes an end limiting block arranged on the rear end surface of the floating slider in the feeding and discharging direction, and lateral guiding plates arranged on both sides to prevent the mold 100 from rushing out of the floating slider.

[0048] In some embodiments, refer to Figures 4 to 6As shown in the figure, the horizontal movement component 320 is provided with a horizontal guide rail 321 and a vertical plate 322. The vertical plate 322 is slidably connected to the horizontal guide rail 321 through a first slider 323; the heating component 310 is connected to one side of the vertical plate 322 facing the mold separating device 200. It should be understood that the horizontal movement component 320 is arranged on the fixing frame. Specifically, the horizontal guide rail 321 can be a linear guide rail arranged longitudinally on both sides of the upper surface of the fixing frame. First sliders 323 are provided on both linear guide rails, and a vertical plate 322 is provided on the two first sliders 323.

[0049] In some embodiments, referring to Figure 5 As shown in the figure, the mold preheating device 300 is further provided with a vertical movement component 330. The vertical movement component 330 is provided with a vertical guide rail 331. The vertical guide rail 331 is fixedly connected to the side surface of the vertical plate 322. The heating component 310 is slidably connected to the vertical guide rail 331 through a second slider 332. It should be understood that the vertical guide rail 331 can be a linear guide rail arranged vertically on both side portions of the side surface of the vertical plate 322. Second sliders 332 are provided on both linear guide rails, and a fixing plate is provided on the two second sliders 332. Cantilever supports are provided on both sides of the fixing plate. The inner sides of the cantilever supports are fixedly connected to both side edges of the outer frame 311. Gears and racks are respectively provided on the vertical plate 322 and the fixing plate, and a servo motor provides driving force to realize precise movement of the heating component 310 in the horizontal and vertical directions.

[0050] In some embodiments, referring to Figures 4 to 6 As shown in the figure, the heating component 310 is provided with an outer frame 311. The upper surface of the outer frame 311 matches the lower surface of the upper die part 110 of the mold 100, and the lower surface of the outer frame 311 matches the upper surface of the lower die part 120 of the mold 100. It should be understood that the outer frame 311 of the heating component 310 is designed according to the shape of the parting surface of the mold 100 to ensure that the upper die parting surface of the mold 100, the heating component 310, and the lower die parting surface form a closed space.

[0051] In some embodiments, referring to Figures 4 to 6As shown in , the heating assembly 310 is provided with a plurality of heating tubes 312, and the plurality of heating tubes 312 are arranged inside the outer frame 311 and arranged in two layers. It should be understood that the outer frame 311 of the heating assembly 310 is welded by double-layer steel plates, the inner steel plate is a heat-resistant steel plate, the steel plate is plated with a reflective layer on the side facing the heating tube 312, and the two layers of steel plates are filled with heat-insulating cotton. The plurality of heating tubes 312 can be arranged in parallel in the outer frame 311. The upper and lower layers of short-wave infrared heating tubes are plated with a reflective layer on the back of each heating tube 312, and the upper and lower mold parts 120 of the mold 100 are heated at the same time. Specifically, one end of the same side of the plurality of infrared heating tubes arranged side by side is electrically connected by wires, and the other end of the same side is divided into three groups according to the number of infrared heating tubes, and is electrically connected by wires and then connected to the three-phase interface of the main control box. The power supply is a three-phase power supply, and the main control box is located at the other end of the same side. In addition, a temperature control device is provided inside the heating component 310, and when the set temperature is reached, the heating system is powered off and an alarm is sounded.

[0052] In some embodiments, reference Figure 7 As shown in , the preheating device further includes: a material inlet and outlet device 400; the material inlet and outlet device 400 and the mold preheating device 300 are respectively arranged on opposite sides of the mold separation device 200, and the material inlet and outlet device 400 is used to transport the mold 100 into the mold preheating device 300. It should be understood that the material inlet and outlet device 400 can be provided with a roller table formed by a plurality of rollers 500 arranged in series, and the height of the upper surface thereof can be consistent with the upper surface of the roller 500 placed on the platform 240 when the mold preheating device 300 enters and exits the mold 100.

[0053] The present invention also provides a method for offline preheating of a mold, wherein the mold is offline preheated using the preheating device for offline preheating of a mold described in any one of the above embodiments.

[0054] In combination with the above embodiments, the specific method of use when using the preheating device is as follows.

[0055] Step 1: The complete set of molds 100 is transferred to the loading and unloading device 400 . The complete set of molds 100 comprises an upper mold part 110 and a lower mold part 120 .

[0056] Step 2: Start the feeding and discharging device 400 and move the mold 100 to the middle floating slide block of the mold separation device 200 via a roller conveyor.

[0057] Step 3: Positioning the mold 100. The mold 100 moves longitudinally and stops after reaching the end stopper, and the lateral positioning cylinder on the floating slide extends to position the mold 100 laterally.

[0058] Step 4: Limit the upper die part 110. After the mold 100 is positioned, the limit cylinders on the columns around the mold separating device 200 extend the limit blocks 251, and insert the limit blocks 251 between the upper die part 110 and the lower die part 120.

[0059] Step 5: Separate the mold 100. After the limit blocks 251 are in place, the lower hydraulic jack retracts, the floating slider drops, driving the mold 100 to move downward. Since the upper die part 110 is restricted by the limit blocks 251, the upper die part 110 and the lower die part 120 of the mold 100 are separated.

[0060] Step 6: Position the heating device of the mold 100. By setting the displacements of the vertical moving component 330 and the horizontal moving component 320, the heating component 310 is moved into the space between the upper and lower dies.

[0061] Step 7: Form a closed space. After the heating component 310 is in place, the hydraulic jack extends slightly, so that the upper surface of the lower die part 120 contacts the lower surface of the heating component 310, thereby forming a closed heating space.

[0062] Step 8: Start heating

[0063] Step 9: After heating is completed, an alarm is issued. The hydraulic jack retracts slightly, and after the heating component 310 moves downward, it moves horizontally backward and moves out of the mold 100.

[0064] Step 10: Close the mold 100. The hydraulic jack extends. After the upper and lower molds 100 are closed, the limit cylinder retracts and the limit blocks 251 retract.

[0065] Step 11: The side cylinder on the floating slider retracts.

[0066] Step 12: Start the feeding and discharging roller table, move the mold 100 out, and use the overhead crane to lift the whole mold 100 to the forging machine to start the forging operation.

[0067] It should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. in the above description is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present invention.

[0068] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0069] In the embodiments of the present invention, unless otherwise clearly defined and limited, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention may be understood according to specific circumstances.

[0070] In the embodiments of the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0071] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0072] Other embodiments of the present invention will be readily apparent to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention following the general principles of the invention and including known common general knowledge or conventional technical means in the technical field not disclosed in the present invention. The specification and examples are only to be considered as exemplary, and the true scope and spirit of the present invention are pointed out by the appended claims.

Claims

1. A preheating device for off-line preheating of a mold, the mold being decomposable into an upper mold part and a lower mold part, characterized in that, The preheating device includes: A mold separation device, which is provided with a frame. The frame is provided with a bottom plate. A lifting component is connected to the bottom plate. The upper end of the lifting component is connected to a placement platform for placing the mold. The upper end of the frame is connected to a limiting component, and the limiting component is arranged between the upper mold part and the lower mold part of the mold. Among them, when the placement platform drives the mold to move downward through the lifting component, the limiting component restricts the downward movement of the upper mold part of the mold, so that the upper mold part and the lower mold part of the mold are separated. The limiting component includes a plurality of limiting blocks. The plurality of limiting blocks are arranged in pairs on both sides of the frame, and each limiting block extends and retracts in the direction towards the mold. When the limiting block extends, the upper surface of the limiting block contacts the lower surface of the upper mold part. A mold preheating device; the mold preheating device is provided with a horizontal moving component. A heating component for preheating the mold is connected to one side of the horizontal moving component facing the mold separation device. The horizontal moving component is used to drive the heating component to move between the upper mold part and the lower mold part of the mold. A feeding and discharging device; the feeding and discharging device and the mold preheating device are respectively arranged on opposite sides of the mold separation device. The feeding and discharging device is used to transport the mold into the mold preheating device.

2. The preheating device according to claim 1, characterized in that, The upper surface of the placement platform is provided with rollers for moving the mold in and out of the mold separation device.

3. The preheating device according to claim 2, characterized in that, Guide sleeves are respectively arranged on both sides of the placement platform, and guide posts matching the guide sleeves are respectively arranged on both sides of the bottom plate. The guide posts are arranged in the vertical direction and sleeved in the guide sleeves.

4. The preheating device according to claim 2, characterized in that, The placement platform is further provided with a positioning component. The positioning component is arranged on the upper surface of the rollers and is used to position the placement position of the mold in the mold preheating device.

5. The preheating device according to claim 1, characterized in that, The horizontal moving component is provided with a horizontal guide rail and a vertical plate. The vertical plate is slidably connected to the horizontal guide rail through a first slider; the heating component is connected to one side of the vertical plate facing the mold separation device.

6. The preheating device according to claim 5, characterized in that, The mold preheating device is further provided with a vertical moving component. The vertical moving component is provided with a vertical guide rail. The vertical guide rail is fixedly connected to the side surface of the vertical plate. The heating component is slidably connected to the vertical guide rail through a second slider.

7. The preheating device according to claim 1, characterized in that, The heating component is provided with an outer frame. The upper surface of the outer frame matches the lower surface of the upper mold part of the mold, and the lower surface of the outer frame matches the upper surface of the lower mold part of the mold.

8. The preheating device according to claim 7, characterized in that, The heating component is provided with a plurality of heating tubes. The plurality of heating tubes are arranged inside the outer frame and are arranged in upper and lower layers.

9. A method for off-line preheating of a mold, characterized in that, The preheating device for offline preheating of a mold according to any one of claims 1-8 is used to perform offline preheating on the mold.

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