Ironing plate heating structure of spreading machine
By setting a porous buffer layer on the electric heating screed, the problem of metal shell deformation during compression or collision is solved, the mechanical strength and buffering capacity are improved, and the equipment cost is reduced, and better thermal insulation and insulation are achieved. Effect.
Patent Information
- Application Number
- CN202421188896.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-05-29
AI Technical Summary
The existing electrically heated screed plates are prone to deform during compression or collision, and increasing thickness in order to increase strength leads to high equipment costs, and the thermal insulation and buffering of the hollow layer cannot take into account both mechanical strength.
A porous buffer layer is provided on the screed. The porous buffer layer is composed of insulating and thermal insulation material. There is a gradient or gradient change in the thickness direction. The pore volume accounts for between 40% and 75%, and the metal shell is supported above it. and buffering, alternative hollow layer design.
On the basis of maintaining good thermal insulation and insulation functions, the mechanical strength and buffering capacity are significantly improved, and the equipment cost is reduced.
Smart Images
Figure CN222349443U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of road maintenance or construction equipment, in particular to a heating structure of an ironing plate of a paving machine. Background Art
[0002] The screed of the asphalt paver used for road maintenance or construction has a heating function. Electric heating is a more commonly used method for heating the screed. An electric heating layer is generally provided above the screed, and sufficient thermal isolation conditions are provided between the electric heating layer and the metal shell to prevent heat loss from above the screed.
[0003] The electric heating screed currently used in the market has an insulation layer and a hollow layer between the electric heating layer and the metal shell. The insulation layer and the hollow layer are adjacent to each other, the insulation layer is close to the electric heating layer, and the hollow layer is on one side of the metal shell. The hollow layer is used to perform heat insulation and buffering functions. However, although the hollow layer performs heat insulation and buffering functions, due to the existence of the hollow layer, the probability of deformation of the metal shell when subjected to pressure or collision will also increase. In particular, when stainless steel is used for the metal shell, increasing the thickness of the metal shell to increase strength also increases the equipment cost. Utility Model Content
[0004] The purpose of the utility model is to make up for the shortcomings of the background technology and provide a heating structure for the ironing board of a paving machine, which improves the mechanical strength and buffering capacity on the basis of ensuring good thermal insulation, insulation and other functional requirements.
[0005] The purpose of the utility model is achieved through the following technical solutions.
[0006] A paving machine screed heating structure comprises a screed body, a heating layer is arranged above the screed body, a heat insulation layer is arranged above the heating layer, a porous buffer layer is arranged above the heat insulation layer, a metal shell layer is arranged above the porous buffer layer, and the porous buffer layer has a plurality of pores extending in the thickness direction.
[0007] In the above-mentioned heating structure of the paving machine ironing plate, the ironing plate body, the heating layer, the heat insulating layer, the porous buffer layer and the metal shell layer are adjacent to and closely attached to each other in sequence from bottom to top.
[0008] In the above-mentioned heating structure of the paving machine ironing plate, the porous buffer layer is made of insulating material, such as but not limited to fiber material, rock wool material, foam material, heat-resistant rubber material or some flexible plastic or resin material, which is the same as or different from the material of the insulation layer.
[0009] In the above-mentioned heating structure for the paving machine ironing plate, the pores of the porous buffer layer are all through holes.
[0010] In the above-mentioned heating structure of the paving machine screed plate, the total volume of the porous buffer layer is V 总 , the total volume of all pores in the porous buffer layer is V 孔 , both satisfy:
[0011] 40%V 总 ≤V 孔 ≤75%V 总 .
[0012] In the above-mentioned heating structure for the paving machine ironing plate, the size of a single pore changes gradually or gradiently along the thickness direction of the porous buffer layer.
[0013] In the above-mentioned heating structure for the paving machine ironing plate, the size of a single pore gradually increases from the top and bottom to the middle along the thickness direction of the porous buffer layer.
[0014] In the above-mentioned heating structure for the paving machine ironing plate, the gradual change or gradient change occurs in the pores along the entire thickness direction of the porous buffer layer.
[0015] In the above-mentioned heating structure for the paving machine ironing plate, the thickness of the porous buffer layer is no more than 3 times the thickness of the thermal insulation layer.
[0016] In the above-mentioned heating structure for the paving machine ironing plate, the porous buffer layer is composed of multiple layers.
[0017] The beneficial effects of the utility model are:
[0018] The heating structure of the paving machine ironing plate provided by the utility model provides a porous buffer layer above the existing heat insulation layer to replace the currently commonly used hollow design, which effectively supports and buffers the metal shell layer above. By further optimizing the extension direction, volume proportion and hole size of the porous buffer layer, the mechanical strength and buffering capacity are greatly improved under the premise of ensuring good basic functional requirements such as heat insulation and insulation. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] By reading the detailed description of the preferred embodiments below, the solutions and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only used to illustrate the preferred embodiments and are not to be considered as limitations of the present invention. In the accompanying drawings:
[0020] Figure 1 A schematic diagram of a heating structure of a paving machine ironing plate provided in Example 1 of the utility model.
[0021] Figure 2 A schematic diagram of a heating structure of a paving machine ironing plate provided in Example 2 of the utility model.
[0022] The components represented by the reference numerals in the figure are:
[0023] Screed body-1, heating layer-2, heat insulation layer-3, porous buffer layer-4, first sheet layer 41, second sheet layer 42, metal shell layer-5. DETAILED DESCRIPTION
[0024] The exemplary embodiments of the present disclosure will be described in more detail below in conjunction with the accompanying drawings. It should be noted that these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. The present disclosure can be implemented in various forms and should not be limited by the embodiments described herein.
[0025] Example 1
[0026] like Figure 1 As shown, the paving machine screed plate heating structure includes a screed plate body 1, a heating layer 2 is arranged above the screed plate body 1, a heat insulation layer 3 is arranged above the heating layer 2, a porous buffer layer 4 is arranged above the heat insulation layer 3, and a metal shell layer 5 is arranged above the porous buffer layer 4, and the porous buffer layer 4 has a plurality of pores extending in the thickness direction.
[0027] Generally speaking, the screed body 1, heating layer 2, insulation layer 3, porous buffer layer 4, and metal shell layer 5 are adjacent and closely attached to each other from bottom to top. However, as needed, technicians in the relevant technical field may also design additional functional layers outside or between the above layers. These designs are not considered in this article.
[0028] In addition, the heating layer 2 herein is particularly suitable to be an electric heating layer.
[0029] The improvement of this embodiment mainly lies in the design of the porous buffer layer 4. The electrically heated ironing plate currently used in the market is provided with a hollow layer above the heat insulation layer, and the hollow layer is used for heat insulation and buffering. Although the hollow layer plays a role of heat insulation and buffering, due to the existence of the hollow layer, the probability of deformation of the metal shell when under pressure or collision will also increase, especially when the metal shell uses stainless steel, increasing the thickness of the metal shell to improve the strength will also increase the equipment cost. By optimizing the structure of the porous buffer layer 4, the needs of the above multiple aspects can be well balanced, that is, the mechanical strength and buffering capacity are greatly improved under the premise of ensuring good basic functional requirements such as heat insulation and insulation.
[0030] First, the material of the porous buffer layer 4 can be the same as or different from that of the thermal insulation layer 3, but generally should have basic insulation and heat insulation capabilities. It can be selected from existing insulation and heat insulation materials such as fiber materials, rock wool materials, foam materials, heat-resistant rubber materials or some flexible plastic or resin materials. Fiber materials, rock wool materials, and foam materials are preferred. If it is the former two, they should have a certain pressing density.
[0031] Preferably, if Figure 1 As shown, the pores of the porous buffer layer 4 can all be through holes, which are easy to shape or process. The shapes and sizes of these through holes are preferably consistent, and the distribution is also preferably uniform.
[0032] In order to improve the isolation capability of the heat insulation layer 3 and the metal shell layer 5 in space, the present embodiment optimizes the total volume of all pores of the porous buffer layer 4. Specifically, the total volume of the porous buffer layer 4 is V 总 , assuming that the total volume of all pores in the porous buffer layer 4 is V 孔 , both satisfy:
[0033] 40%V 总 ≤V 孔 ≤75%V 总 .
[0034] The total volume of all pores in the porous buffer layer 4 is too small, for example, less than 40% V 总 It will affect the isolation ability of the thermal insulation layer 3 and the metal shell layer 5 in space. The total volume of all pores in the porous buffer layer 4 is too large, for example, more than 75% V 总 The strength and buffering capacity of the porous buffer layer 4 itself cannot be well guaranteed.
[0035] The thickness of the porous buffer layer 4 is generally significantly higher than the thickness of the thermal insulation layer 3 in order to construct a sufficient isolation space, but it is not recommended to exceed 3 times the thickness of the thermal insulation layer 3. It can be designed based on the actual application effect.
[0036] Generally speaking, the hole type of a single pore is not limited as long as it meets the technical purpose of the utility model. It can be a plurality of straight holes evenly distributed, or a grid of holes, etc. The shape is also not limited, and round holes, square holes, special-shaped holes, etc. are all acceptable.
[0037] In this embodiment, in order to minimize the probability of heat transfer in the solid support part, it is preferred that the size of a single pore changes gradually along the thickness direction of the porous buffer layer 4. For example, in this embodiment, the size of a single pore gradually increases from the top and bottom to the middle along the thickness direction of the porous buffer layer 4, so that the solid support part has an intermediate "bottleneck".
[0038] The “gradient” mentioned above may also be modified, for example, into a gradient change similar to a step.
[0039] In addition, the above-mentioned gradual change or gradient change can be like Figure 1 As shown in the figure, the pores may be generated in the entire thickness direction of the porous buffer layer 4, or they may be generated in a part of the height of the pores along the thickness direction of the porous buffer layer 4 (that is, local dimensional stable areas are not excluded), which will not be listed.
[0040] Example 2
[0041] In the screed heating structure listed in the present invention, the screed body 1, the heating layer 2, the heat insulating layer 3, the porous buffer layer 4, and the metal shell layer 5 are adjacent and closely attached in sequence from bottom to top, and the number of layers, especially the heat insulating layer 3 and the porous buffer layer 4, is not strictly limited.
[0042] For example, in this embodiment, the interlayer structure of the porous buffer layer 4 in embodiment 1 is further designed on the basis of embodiment 1. Figure 2 As shown, the porous buffer layer 4 is composed of multiple layers, including a first layer 41 and a second layer 42 .
[0043] When the porous buffer layer 4 is composed of multiple layers, there are many advantages in terms of manufacturing, thickness combination, etc. For example, the pores on the porous buffer layer 4 are realized by punching or pressing tooling. Figure 1 As for the hole type of the pores shown in the figure, since the middle size is large and the upper and lower sizes are small, there is a "bottleneck" in the middle, which is not easy to process with punching or pressing tools. However, if Figure 2 The first sheet 41 and the second sheet 42 are spliced together, and the pores are also spliced up and down. There is no processing "bottleneck" for half of the pores on each sheet, and they are all very easy to form.
[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.
Claims
1. A heating structure for a paving machine ironing plate, characterized in that: The invention comprises a screed plate body (1), a heating layer (2) is arranged above the screed plate body (1), a heat insulating layer (3) is arranged above the heating layer (2), a porous buffer layer (4) is arranged above the heat insulating layer (3), a metal shell layer (5) is arranged above the porous buffer layer (4), and the porous buffer layer (4) has a plurality of pores extending in the thickness direction.
2. A heating structure for a paving machine screed plate according to claim 1, characterized in that: The screed body (1), the heating layer (2), the heat insulating layer (3), the porous buffer layer (4), and the metal shell layer (5) are adjacent to each other and closely attached in sequence from bottom to top.
3. The heating structure of the paving machine screed plate according to claim 1, characterized in that: The porous buffer layer (4) is made of an insulating and heat-insulating material, which is the same as or different from the material of the heat-insulating layer (3).
4. The heating structure of the paving machine screed plate according to claim 1, characterized in that: The pores of the porous buffer layer (4) are all through holes.
5. The heating structure of the paving machine screed plate according to claim 1, characterized in that: The total volume of the porous buffer layer (4) is V 总 The total volume of all pores in the porous buffer layer (4) is V 孔 , both satisfy: 40%V 总 ≤V 孔 ≤75%V 总 。 6. The heating structure of the paving machine screed plate according to claim 1, characterized in that: The size of a single pore changes gradually or gradiently along the thickness direction of the porous buffer layer (4).
7. A heating structure for a paving machine screed plate according to claim 6, characterized in that: The size of a single pore gradually increases from the upper part and the lower part to the middle part along the thickness direction of the porous buffer layer (4).
8. The heating structure of the paving machine screed plate according to claim 6, characterized in that: The gradual change or gradient variation occurs in the pores along the entire thickness direction of the porous buffer layer (4).
9. The heating structure of the paving machine screed plate according to claim 1, characterized in that: The thickness of the porous buffer layer (4) is no more than three times the thickness of the heat insulation layer (3).
10. A heating structure for a paving machine screed plate according to claim 1 or 6, characterized in that: The porous buffer layer (4) is composed of multiple layers.