A retrofit kit for a vacuum radiation drying apparatus

Abstract

The utility model discloses a kind of retrofit kits for vacuum radiation drying equipment, the retrofit kit is used to replace the heating assembly in existing vacuum drying equipment, the retrofit kit includes radiation plate, for installing the card rail of the radiation plate and industrial control equipment, the card rail is fixed on the inner wall of vacuum radiation drying equipment, the industrial control equipment is connected with the power supply circuit of the radiation plate, the radiation plate includes shell, heating plate connected with the shell and heating component mounted on the heating plate, the surface of the heating plate has radiation coating, the heating component is independent heating pipe, the back side of the heating plate is provided with fixed groove, the heating pipe is inserted into the groove, the heating plate and the shell are movably connected together, and the heating plate is freely telescopic at least along length direction. The retrofit kit of the utility model can be directly used to replace the heating assembly in existing vacuum drying equipment, and is convenient to transform.

Description

Technical Field

[0001] This utility model relates to a heating component for use in drying equipment, and more particularly to a heating component for use in drying equipment for drying transformer cores. Background Technology

[0002] In the prior art, such as the utility model patent with Chinese patent number CN201310624796.3, published on July 23, 2014, a unidirectional infrared radiation plate is disclosed, which has three functional layers: a heat insulation layer, a heat-generating insulation layer, and a metal heat-conducting radiation layer. It is composed of layers of materials with different functions. Its first layer is the heat insulation layer, its second layer is the heat-generating insulation layer, and its third layer is the metal heat-conducting radiation layer. The heat insulation layer is composed of silicate or silicon oxide ceramic material, formed as a fiber layer and a porous layer, or a mixture of porous and fiber layers. The heat-generating insulation layer is composed of silicate or silicon oxide ceramic material; one side of this layer is a rough surface, and the other side is engraved with uniformly distributed grooves. Heating wires are embedded in these grooves, or conductive silicon carbide is sintered in the grooves. The metal heat-conducting radiation layer is made of a heat-conducting metal material, with an oxide layer formed on its surface. One side is combined with the heat-generating insulation layer, and the other side is coated with an infrared radiation material. In the above solution, the multiple heating layers are rigidly connected, and the heating plate operates at a very high temperature. Temperature differences exist between the heating layers, resulting in varying degrees of thermal expansion. The rigid connection forcibly restricts the free expansion of the heating plate, causing bending and deformation of the metal heating plate. This creates gaps between the heating layers. These gaps lead to poor contact between the temperature probe and the heating plate, resulting in a lower detected temperature. This misleads the temperature control module, causing the heating plate temperature to be higher than expected, affecting the safety of the dried product. The insulation between the heating wires relies entirely on the insulating material. Gaps allow insulating material powder to settle, causing the heating wires to warp. This insulation failure can easily lead to short circuits, generating large currents and significant heat. This can cause the insulating material to overheat and fail. If the heat source is energized, it will directly connect to the outer casing, resulting in an externally electrified heating plate, posing a serious safety hazard. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a modification kit that is easy to modify and suitable for modifying existing vacuum drying equipment.

[0004] According to the present invention, a retrofit kit for a vacuum radiation drying equipment is provided. The retrofit kit is used to replace the heating component in an existing vacuum radiation drying equipment. The retrofit kit includes a radiation plate, a mounting rail for mounting the radiation plate, and an industrial control device. The mounting rail is fixed to the inner wall of the vacuum drying equipment. The industrial control device is connected to the power supply line of the radiation plate. The radiation plate includes a housing, a heating plate connected to the housing, and a heating component mounted on the heating plate. The surface of the heating plate has a radiation coating. The heating component is an independent heating tube. A fixing groove is provided on the back side of the heating plate, and the heating tube is inserted into the groove. The heating plate is movably connected to the housing, and the heating plate can freely extend and retract at least along its length.

[0005] The modification kit for vacuum radiation drying equipment provided by this utility model also has the following auxiliary technical features:

[0006] The device further includes wiring channels, which are fixed to the inner wall of the vacuum radiation drying equipment and located at both ends of the radiation plate.

[0007] The device further includes a positioning clip, which is fixed to the housing. The guide rail is stamped with a fixing claw and a fixing hole. The positioning clip is engaged with the fixing claw, and the positioning clip is connected to the fixing hole through a fixing member.

[0008] Further, the heating plate is made of aluminum alloy drawn into shape, the shell is made of galvanized iron sheet bent into shape, and a heat storage tank is formed between the shell and the heating plate.

[0009] Further, the housing includes an outer shell and an inner shell, with an insulation space formed between the outer shell and the inner shell, and the insulation space is filled with an insulation layer, which is integrally formed from insulation material.

[0010] Further, the heating plate has bent wing plates formed on both sides, and the wing plates have grooves formed on them. The housing has flanges formed on both sides, and the flanges are engaged in the grooves.

[0011] Further, the minimum movable gap formed between the heating plate and the shell is set as D, then D≥L×a×T, where L is the length or width of the heating plate, a is the linear expansion coefficient of the heating plate, and T is the temperature change value of the heating plate.

[0012] Further, the heating tube includes a metal outer tube, a heating wire installed in the outer tube, and an insulating material. An insulating magnetic head is provided at the end of the outer tube. The heating tube also includes a lead post. A shrinkable insulating sleeve is fitted over the lead post. One end of the heating tube is connected to a connecting piece. The connecting piece is connected to the housing by a fastener. The other end of the heating tube extends out of the groove to form a free end.

[0013] Further, the frictional force between the heating tube and the groove is F, the gravity generated by the weight of the heating plate is G, and the deformation force generated by the heating plate during thermal expansion and contraction is N. Then a×G≤F≤b×N, where a is a constant with a value range of a=3-10; b is a constant with a value range of b=0.1-0.3.

[0014] Further, the heating plate is a long strip-shaped flat plate structure, and multiple heating tubes are installed on the back side of the heating plate; or the cross-section of the heating plate is arc-shaped or polygonal, and a single heating tube is installed on the back side of the heating plate.

[0015] Compared with the prior art, the modification kit for vacuum radiation drying equipment provided by this utility model has the following advantages: First, the modification kit of this utility model can be directly used to replace the heating components in existing vacuum drying equipment, making modification convenient. Second, the heating plate of this utility model is movably connected to the shell and heating tube, allowing the heating plate to expand and contract freely, ensuring a safe distance between the plates. No stress is generated inside the heating plate, preventing warping or deformation that could create gaps, or failure at the fastening joints due to stress, thus avoiding damage to the heating plate. Attached Figure Description

[0016] Figure 1 This is a front view of a partial connection structure in this utility model.

[0017] Figure 2 This is a top view of a partial connection structure in this utility model.

[0018] Figure 3 This is a front view of the combination of the radiating plate and the rail in this utility model.

[0019] Figure 4 This is the front view of the rail in this utility model.

[0020] Figure 5 This is a top view of the rail in this utility model.

[0021] Figure 6 This is a left view of the rail in this utility model.

[0022] Figure 7 This is the front view of the positioning clip in this utility model.

[0023] Figure 8 This is a top view of the positioning clip in this utility model.

[0024] Figure 9 This is a front view of the radiating plate in this utility model.

[0025] Figure 10 for Figure 9 Top view.

[0026] Figure 11 for Figure 9 Top view with the cover plate removed.

[0027] Figure 12 This is a front view of the heating plate in this utility model.

[0028] Figure 13 This is a front view of the inner shell in this utility model.

[0029] Figure 14 This is a front view of the outer shell of this utility model.

[0030] Figure 15 This is a front view of the heating tube in this utility model.

[0031] Figure 16 This is a front view of the radiating plate combination used in this utility model.

[0032] Figure 17 This is a front view of another embodiment of the present invention.

[0033] Figure 18 for Figure 17 Top view.

[0034] Figure 19 This is a physical image of the present invention. Detailed Implementation

[0035] To clearly illustrate the solutions in this utility model, preferred embodiments are given below in conjunction with the accompanying drawings for detailed description. The following description is merely exemplary and not intended to limit the application or use of this disclosure. It should be understood that throughout the drawings, corresponding reference numerals denote the same or corresponding parts and features.

[0036] like Figures 1 to 15As shown, this utility model provides a retrofit kit for a vacuum radiation drying equipment. The kit replaces the heating components in an existing vacuum drying equipment. The kit includes a radiation plate 10, a mounting rail 20 for the radiation plate 10, and an industrial control device. The mounting rail 20 is fixed to the inner wall of the vacuum radiation drying equipment. The industrial control device is connected to the power supply line of the radiation plate 10. The radiation plate includes a housing 1, a heating plate 2 connected to the housing 1, and a heating element mounted on the heating plate 2. The surface of the heating plate 2 has a radiation coating. The heating element is an independent heating tube 3. A fixing groove 21 is provided on the back side of the heating plate 2, and the heating tube 3 is inserted into the groove 21. The heating plate 2 is movably connected to the housing 1, and the heating plate 2 can freely extend and retract at least along its length. This utility model provides a retrofit kit for upgrading existing vacuum radiation drying equipment, replacing the existing heating components, thereby upgrading the existing vacuum radiation drying equipment and improving its drying efficiency. The mounting rail 20 is used to suspend the radiation plate 10, and two rails are used, one above the other, connected to the two ends of the housing 1 respectively. The industrial control equipment refers to the control program used to install the radiating plate. The industrial control equipment can be a new device or an existing industrial control equipment that has been upgraded and modified.

[0037] The radiant coating in this invention is an infrared thermal radiation coating, which can generate infrared radiation from the high temperature of the heating tube 3 through the heating plate 2. The radiant plate in this invention is mainly used in vacuum radiation drying equipment. This type of drying equipment is primarily used in the drying process of transformer manufacturing, and using infrared radiation to heat the inner cavity of the drying equipment results in better heating effects. Figure 19 This is a physical image of the utility model; the right side is the front, and the left side is the back. The front view on the right shows a black radiation coating on the surface.

[0038] Existing heating plates mainly employ a large-panel structure with multiple layers, where the heating wire is directly embedded within the layers. However, the following problems have been observed during use: 1) The heating wire is exposed without insulation, and the use of mica paper and magnesium oxide powder for post-insulation is unreliable; 2) Temperature probes are screwed between the plates to measure temperature, which is unreliable, prone to providing erroneous data, and interferes with temperature control; 3) Excessive heating power and surface temperature on a single plate lead to overheating, making the temperature control module overly dependent on temperature limits. Probe failure can cause the heating plate to overheat and burn the dried product; 4) Using conventional insulation cotton as the insulation layer allows powder from the insulation to enter the product and vacuum pump piping during the vacuum process, negatively impacting product and equipment safety; 5) The heating plate's rated voltage is 100V, requiring an external transformer, which is inconvenient. The aforementioned problems are mainly caused by the following reasons: The multi-layer heating plates are fixed by bolts with a rigid connection. The heating plates operate at very high temperatures, and there is a temperature difference between the three heating plates, resulting in different degrees of thermal expansion. The rigid connection forcibly restricts the free expansion of the heating plates, causing them to bend and deform. This creates gaps between the plates, leading to two problems: 1. The temperature probe is fixed here with a threaded connection. Gaps in these gaps cause poor contact between the probe and the heating plate, resulting in a lower detected temperature. This misleads the temperature control module, causing the heating plate temperature to be higher than expected, affecting the safety of the dried product. 2. The insulation between the heating wires relies entirely on magnesium oxide powder. Gaps cause the magnesium oxide powder to settle, and the nickel-chromium alloy flat wires warp. This leads to insulation failure between the nickel-chromium alloy flat wires, easily causing a short circuit and generating a large current and a large amount of heat. This can easily cause the mica paper to overheat and fail. If the heat source is energized, it will directly connect to the outer casing, resulting in the heating plate becoming externally electrified, posing a serious safety hazard.

[0039] To address the aforementioned problems, this invention features a flexible connection between the heating plate 2 and the housing 1, rather than a rigid one. This allows the heating plate 2 to freely expand and contract relative to the housing 1 without deformation, thus resolving existing technical issues. The invention uses an independent heating tube as the heat source, ensuring the heating wire is safely isolated from the heating plate without contact. This provides sufficient overall mechanical strength, preventing warping and deformation under heat, and eliminating the risk of electrical leakage. The cross-section of the groove 21 is the same as that of the heating tube 3, allowing the heating tube 3 to fit tightly against the groove 21, facilitating heat transfer from the heating tube 3 to the heating plate 2. In this embodiment, the heating tube 3 is a circular tube, and the groove 21 is also circular with an opening on the side. This structure provides a pre-tightening force to the groove 21, ensuring that when the heating tube 3 is inserted into it, the groove 21 clamps the heating tube 3 securely, preventing it from easily detaching. However, when the heating plate 2 expands and contracts with heat, the groove 21 and the heating tube 3 slide relative to each other, providing deformation space for the heating plate 2.

[0040] In this invention, the heating plate 2 is flexibly connected to both the housing 1 and the heating tube 3. This connection method provides deformation space for the heating plate 2, meaning the heating plate 2 has a deformation allowance. The flexible connection refers to a sliding groove connection structure, a snap-fit ​​structure, etc., which has a certain amount of flexibility. The rigid connection refers to bolts, rivets, adhesives, etc., which provide a strong connection but do not have any flexibility.

[0041] See Figures 1 to 8 In the above embodiments of this utility model, the device further includes a wiring trough 30, which is fixed to the inner wall of the vacuum radiation drying equipment and located at both ends of the radiation plate 10. The wiring trough 30 includes a bottom groove and a cover; the bottom groove is installed on the inner wall of the equipment, and the cover is fastened to the bottom groove. The power lines and sensor signal lines on the radiation plate 10 converge and enter the wiring trough 30. The wiring trough 30 protects the wiring and improves safety.

[0042] See Figures 1 to 8In the above embodiments of this utility model, a positioning clip 40 is further included. The positioning clip 40 is fixed to the housing 1. The guide rail 20 has a fixed claw 201 and a fixed hole 202 stamped on it. The positioning clip 40 is inserted into the fixed claw 201, and the positioning clip 40 is connected to the fixed hole 202 by a fixing member. The guide rail 20 has a protrusion, and the fixed claw 201 and the fixed hole 202 are formed on the protrusion, which facilitates the installation of the radiation plate 10. The positioning clip 40 is generally a long strip-shaped structure with a bent part at one end. The bent part is fixed to the housing 1 by screws. One end of the positioning clip 40 is inserted below the fixed claw 201 for limiting during installation. At the same time, the positioning clip 40 is fixed to the guide rail 20 by bolts.

[0043] See Figures 9 to 15 In the above embodiments of this utility model, the heating plate 2 is further comprising being formed from aluminum alloy by drawing, and the shell 1 is formed from galvanized iron sheet by bending. A heat storage tank 11 is formed between the shell 1 and the heating plate 2. Existing heating plates mainly employ a large-panel structure with multiple layers, where heating wires are directly embedded within the layers. The layers are rigidly connected by bolts, resulting in complex processing, low yield, and high cost. This utility model uses aluminum alloy to form the heating plate 2, enabling continuous large-scale production, reducing processing costs, and improving processing efficiency. The shell 1 is made from galvanized iron sheet by bending, which is low-cost and easy to process. Aluminum alloy has good thermal conductivity, meeting the thermal conductivity requirements of infrared radiation. The shell 1, made from galvanized iron sheet, reduces costs while maintaining strength. Therefore, this utility model reduces costs and is easy to process. The heat storage tank 11 has a heat storage function, improving radiation efficiency.

[0044] See Figures 9 to 15 In the above embodiments of this utility model, the housing 1 further includes an outer shell 12 and an inner shell 13, with an insulation space formed between the outer shell 12 and the inner shell 13. An insulation layer 14 is filled in the insulation space, and the insulation layer 14 is integrally formed from insulation material. This utility model adopts a double-layer housing structure, forming an insulation space between the outer shell 12 and the inner shell 13, and placing the insulation layer 14 within this insulation space. The insulation layer 14 is made of insulation material and, when placed within the insulation space, better protects the insulation material and prevents it from splashing. Under the action of vacuum suction, no powder will be generated that could affect the product or vacuum system piping. This utility model's integral structure of the insulation material reduces powder generation and does not affect the product or vacuum system piping.

[0045] See Figures 9 to 15In the above embodiments of this utility model, the heating plate 2 and the housing 1 are further connected by a sliding groove structure, and the heating plate 2 can freely expand and contract along the sliding groove structure. In this utility model, the heating plate 2 and the housing 1 are connected by a sliding groove structure. When the heating plate 2 expands and contracts due to heat, it can expand and contract along the sliding groove, which serves as a deformation space for the heating plate 2, preventing warping and deformation. This solves the deformation problem caused by rigid connections in the prior art.

[0046] See Figures 9 to 15 In the above embodiment of this utility model, the heating plate 2 is further comprising bent wing plates 22 formed on both sides, the wing plates 22 having grooves 23 formed thereon, and the housing 1 having flanges 15 formed on both sides, the flanges 15 being engaged in the grooves 23. This utility model employs a connection structure of flanges 15 and grooves 23, which provides deformation allowance not only in the length direction but also in the width direction, thereby ensuring the flatness of the heating plate 2 and preventing warping or deformation. The heating plate 2 and the housing 1 are movably connected, i.e., a flexible connection is used instead of a rigid connection. The heating plate 2 can freely expand and contract relative to the housing 1 during thermal expansion and contraction, and is less prone to deformation.

[0047] See Figures 9 to 15 In the above embodiment of this utility model, the heating plate 2 is further comprising: bent wing plates 22 formed on both sides; multiple sliding grooves 23 formed on the wing plates 22; and flanges 15 formed on both sides of the outer shell 12 and the inner shell 13, the flanges 15 being engaged in the sliding grooves 23. The outer shell 1 of this utility model is composed of a double-layer shell, both layers of which are connected to the sliding grooves of the heating plate 2. During thermal expansion and contraction, the heating plate 2 can expand and contract relative to the shell 1, and the heating plate 2 is not easily deformed.

[0048] See Figures 9 to 15 In the above embodiments of this utility model, the minimum movable gap formed between the heating plate 2 and the housing 1 is further defined as D, where D ≥ L × a × T, and L is the length or width of the heating plate, a is the linear expansion coefficient of the heating plate, and T is the temperature change value of the heating plate. In this embodiment, the heating plate 2 is made of aluminum alloy, and the linear expansion coefficient of the heating plate 2 is 24 × 10⁻⁶. -6The heating plate 2 has a length of 1000mm and a width of 140mm. The operating temperature is 300℃, and the ambient temperature is 25℃. Therefore, the movable clearance D of the heating plate 2 in the length direction is ≥1000×0.000024×275, i.e., D≥6.6mm. The movable clearance D of the heating plate 2 in the width direction is ≥140×0.000024×275, i.e., D≥0.924mm. In this embodiment, when the heating plate 2 is operating normally, the maximum deformation length in the length direction is 6.6mm, and the maximum deformation in the width direction is 0.924mm. The movable clearance between the heating plate 2 and the housing 1 needs to be greater than 6.6mm in the length direction and greater than 0.924mm in the width direction. The above formula can more accurately determine the setting of the movable clearance.

[0049] See Figures 9 to 15 In the above embodiment of this utility model, the heating tube 3 further includes a metal outer tube 33, a heating wire installed in the outer tube 33, and insulating material. An insulating magnetic head 34 is provided at the end of the outer tube 33. The heating tube 3 also includes a lead-out post 35, and a shrinking insulating sleeve 36 is fitted over the lead-out post 35. One end of the heating tube 3 is connected to a connecting piece 31, and the connecting piece 31 is connected to the housing 1 by a fastener 32. The other end of the heating tube 3 extends out of the groove 21 to form a free end. The insulating magnetic head 34 serves to limit and fix the outer tube 33, and also serves to insulate it. The insulating magnetic head 34 is tightened by a fixing nut. The lead-out post 35 has threads, and the nut is installed on the lead-out post 35. The shrinking insulating sleeve 36 serves a protective function and improves safety. In this embodiment, one end of the heating tube 3 is connected to the housing 1 by a fastener 32, thereby limiting the heating tube 3. This invention connects the housing 1, heating plate 2, and heating tube 3 together, with allowance for deformation between each component. In this invention, the heating plate 2 can be fixedly connected to the heating tube 2 or housing 1 at one end, with the remaining parts not rigidly connected, allowing the heating plate 2 to freely extend and retract to the other end. Alternatively, it can be fixedly connected in the middle, allowing the heating plate 2 to freely extend and retract in both directions.

[0050] See Figures 9 to 15In the above embodiments of this utility model, the frictional force between the heating tube and the groove is F, the gravity generated by the weight of the heating plate is G, and the deformation force generated by the heating plate during thermal expansion and contraction is N. Therefore, a×G≤F≤b×N, where a is a constant with a value range of a=3-10; b is a constant with a value range of b=0.1-0.3. In this embodiment, a is 5 and b is 0.2. That is, 5G≤F≤0.2N. The groove 21 in this utility model has a pre-tightening force, which can clamp the heating tube 3. Under normal conditions, the positions of the heating plate 2 and the heating tube 3 are relatively fixed and will not easily shift, i.e., they are connected together. When the heating plate 2 undergoes thermal expansion and contraction, the deformation force of the heating plate 2 is greater than the frictional force between the heating tube 3 and the groove 21, and the heating plate 2 slides relative to the heating tube 3, i.e., the heating plate 2 can freely expand and contract without easily deforming.

[0051] See Figures 9 to 15 In the above embodiments of this utility model, the heating plate 2 is a long, flat plate structure, and multiple heating tubes 3 are mounted on the back side of the heating plate 2. In this embodiment, the heating plate 2 is a rectangular flat plate structure with a length of 1000mm, a width of 145mm, and a thickness of 3mm. A boss is integrally formed on the back side, and a groove 21 is formed on the boss. The heating tubes 3 are inserted into the grooves 21. In this embodiment, there are two heating tubes 3 and two grooves 21.

[0052] See Figure 16 In the above embodiments of this utility model, the invention further includes a top slot plate 101 and a bottom slot plate 102. The tops of the plurality of radiation plates 10 are inserted into the top slot plate 101, and the bottoms of the plurality of radiation plates 10 are inserted into the bottom slot plate 102. The plurality of radiation plates 10 are assembled together to form a large-width radiation unit. To expand the radiation area, this utility model can use multiple radiation plates to form a radiation unit. In this splicing structure, there are gaps between the radiation plates, which meets the requirements of the heat deformation of each radiation plate, so that the large-width radiation unit will not deform. In this embodiment, the radiation unit includes a top slot plate and a bottom slot plate. The plurality of radiation plates are arranged side by side. The top slot plate is inserted into the top of the plurality of radiation plates, and the bottom slot plate is inserted into the bottom of the plurality of radiation plates, so that the radiation plates form an integral structure. The wiring of each heating tube 3 is summarized and led out to the outside through a bus for easy wiring.

[0053] See Figure 16 and Figure 17In another embodiment of this utility model, the heating plate 2 has an arc-shaped or polygonal cross-section, and a single heating tube 3 is installed on the back side of the heating plate 2. In this embodiment, the heating plate 2 has an arc-shaped structure, which can expand the radiation angle and increase the radiation area. In this embodiment, the heating plate 2 is relatively narrow, close to the size of a single tube in a conventional hot oil heating heat dissipation pipe, which is beneficial for modifying existing drying equipment. Other structures in this embodiment are the same as those in the above embodiment.

[0054] In summary, the above description is merely an embodiment of this utility model and is only used to illustrate the principle of this utility model, not to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A modification kit for vacuum radiation drying equipment, characterized in that: The modification kit is used to replace the heating components in existing vacuum drying equipment. The modification kit includes a radiation plate, a mounting rail for mounting the radiation plate, and an industrial control device. The mounting rail is fixed to the inner wall of the vacuum radiation drying equipment. The industrial control device is connected to the power supply line of the radiation plate. The radiation plate includes a housing, a heating plate connected to the housing, and a heating element mounted on the heating plate. The surface of the heating plate has a radiation coating. The heating element is an independent heating tube. A fixing groove is provided on the back side of the heating plate, and the heating tube is inserted into the groove. The heating plate is movably connected to the housing, and the heating plate can freely extend and retract at least along its length.

2. The modification kit for a vacuum radiation drying equipment as described in claim 1, characterized in that: It also includes wiring channels, which are fixed on the inner wall of the vacuum radiation drying equipment and located at both ends of the radiation plate.

3. The modification kit for a vacuum radiation drying equipment as described in claim 1, characterized in that: It also includes a positioning clip, which is fixed to the housing. The guide rail is stamped with a fixing claw and a fixing hole. The positioning clip is inserted into the fixing claw, and the positioning clip is connected to the fixing hole through a fixing member.

4. A modification kit for a vacuum radiation drying equipment as described in claim 1, characterized in that: The heating plate is made of aluminum alloy by drawing, and the shell is made of galvanized iron sheet by bending. A heat storage tank is formed between the shell and the heating plate.

5. A modification kit for a vacuum radiation drying equipment as described in claim 1, characterized in that: The housing includes an outer shell and an inner shell, with an insulation space formed between the outer shell and the inner shell. The insulation space is filled with an insulation layer, which is integrally formed from insulation material.

6. A retrofit kit for a vacuum radiation drying equipment as described in claim 1, characterized in that: The heating plate has bent wing plates on both sides, and the wing plates have grooves formed on them. The shell has flanges on both sides, and the flanges are inserted into the grooves.

7. A retrofit kit for a vacuum radiation drying equipment as described in claim 1, characterized in that: Let D be the minimum movable gap formed between the heating plate and the shell. Then D ≥ L × a × T, where L is the length or width of the heating plate, a is the linear expansion coefficient of the heating plate, and T is the temperature change value of the heating plate.

8. A retrofit kit for a vacuum radiation drying equipment as described in claim 1, characterized in that: The heating tube includes a metal outer tube, a heating wire installed in the outer tube, and insulating material. An insulating magnetic head is provided at the end of the outer tube. The heating tube also includes a lead wire post. A shrinkable insulating sleeve is fitted over the lead wire post. A connecting piece is connected to one end of the heating tube. The connecting piece is connected to the housing by a fastener. The other end of the heating tube extends out of the groove to form a free end.

9. A retrofit kit for a vacuum radiation drying equipment as described in claim 1, characterized in that: The frictional force between the heating tube and the groove is F, the gravity generated by the weight of the heating plate is G, and the deformation force generated by the heating plate during thermal expansion and contraction is N. Then a×G≤F≤b×N, where a is a constant with a value range of a=3-10; b is a constant with a value range of b=0.1-0.

3.

10. A retrofit kit for a vacuum radiation drying equipment as described in claim 1, characterized in that: The heating plate is a long strip-shaped flat plate structure, and multiple heating tubes are installed on the back side of the heating plate; or the cross-section of the heating plate is arc-shaped or polygonal, and a single heating tube is installed on the back side of the heating plate.

Images