Adhesion-inhibiting scoop

Abstract

The present invention provides an adhesion-suppressing shovel that can suppress the adhesion of materials to objects containing soil, sand, etc., when inserting or transporting them, compared to conventional shovels. [Solution] In a shovel 1 that prevents adhesion and has a main body portion 12 that comes into contact with the object to be inserted and transported, and a handle portion 11 connected to the main body portion 12, the main body portion 12 is characterized in that it has a resin-metal portion 121 formed by joining a fluororesin portion 1212 and a metal portion 1211.

Description

Technical Field

[0001] The present invention relates to an adhesion-inhibiting scoop that can be used for insertion into earth and sand, excavation, transportation, etc.

Background Art

[0002] Conventionally, for example, in temporary earth retaining work, when installing horizontal sheet piles etc. after driving the main piles, excavation is carried out by manual labor using a scoop. Also, outside of the above-mentioned work, manual labor using a scoop is carried out for excavation, loading, etc. using a scoop.

[0003] In the above-mentioned manual labor, when manually excavating a cohesive soil ground or silt ground containing a large amount of moisture, the excavated soil easily adheres to the scoop and is difficult to drop, so the work efficiency decreases and heavy labor is imposed on the worker.

[0004] In such a situation, for example, Patent Document 1 discloses a device in which a through-hole for preventing earth and sand adhesion is provided in the scoop body, and further, Patent Document 2 discloses an invention of a scoop in which corrugated processing is performed on the scoop body to suppress the adhesion of earth and sand.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the invention disclosed in Patent Document 1, the through-hole portion may increase the sliding resistance of the soil, making it more difficult for the soil to fall. Also, in the invention disclosed in Patent Document 2, the corrugated processing increases the contact area with the soil, and especially in the case of cohesive soil containing a lot of moisture, it may also make it more difficult for the soil to fall.

[0007] Therefore, in view of the various problems mentioned above, the present invention aims to provide a shovel that can suppress the adhesion of materials to be inserted and transported, including soil and sand, to a greater extent than conventional shovels, when inserting and transporting such materials. [Means for solving the problem]

[0008] The present invention relates to an adhesion-preventing scoop having a main body that comes into contact with an object to be inserted and transported, and a handle connected to the main body, wherein the main body has a resin-metal part formed by joining a fluororesin part and a metal part.

[0009] Furthermore, according to one embodiment, the adhesion-suppressing scoop is characterized in that at least one of the front surface and back surface of the main body is composed of the fluororesin portion of the resin metal portion.

[0010] Furthermore, according to one embodiment, the adhesion-suppressing scoop is characterized in that the end surface of the main body is formed by the metal part of the resin metal part.

[0011] Furthermore, according to one embodiment, the adhesion-suppressing scoop is characterized in that the metal part is made of a metal containing aluminum or beryllium. [Effects of the Invention]

[0012] The anti-adhesion shovel of the present invention significantly reduces frictional resistance in the shovel body, making it less likely for objects to stick to it during insertion and transport, thereby saving labor and improving work efficiency in manual construction. In addition, it can also reduce the mental stress on workers. [Brief explanation of the drawing]

[0013] [Figure 1] In one embodiment of the present invention, (a) is a drawing showing an example of a round shovel, (b) is a square shovel, and (c) is a drawing showing an example of a double shovel. [Figure 2] This drawing shows an example of how the main body is formed in one embodiment of the present invention. [Figure 3] This table and diagram illustrate the method for comparative experiments on the resin-metal parts of the present invention. [Figure 4] This graph shows the results of the comparative experiment explained in Figure 3. [Figure 5] This graph shows the results of comparing the maximum circumferential friction force for the resin metal part of the present invention. [Figure 6] This is a comparative table showing the time required for workers to excavate natural ground. [Figure 7] This is a comparison of the time required for workers to excavate the natural ground. [Figure 8] These are the questionnaire items used in the sensory evaluation test of the adhesion-suppressing shovel of the present invention by workers. [Figure 9] This graph shows the results of a sensory evaluation test for the adhesion-inhibiting scoop of the present invention. [Figure 10] This graph shows the results of a sensory evaluation test for the adhesion-inhibiting scoop of the present invention. [Figure 11] This drawing shows an example of how the main body is formed in one embodiment of the present invention. [Modes for carrying out the invention]

[0014] Hereinafter, while referring to the drawings, an embodiment of the adhesion-inhibiting scoop of the present invention will be described. Note that the adhesion-inhibiting scoop of the present invention is not necessarily limited to the embodiment shown below.

[0015] As shown in FIG. 1, the adhesion-inhibiting scoop of the present invention includes a round scoop (a), a square scoop (b), a double scoop (c), etc., which are used in insertion into earth and sand, excavation, transportation, etc. The example shown in FIG. 1 is a representative embodiment and is not necessarily limited to the illustrated shape.

[0016] And in the adhesion-inhibiting scoop 1 of the present embodiment, which has a main body portion 12 that contacts the insertion and transportation object and a handle portion 11 connected to the main body portion 12, the main body portion 12 has a resin-metal portion 121 in which a fluororesin portion 1212 and a metal portion 1211 are joined.

[0017] More specifically, the adhesion-inhibiting scoop 1 of the present embodiment as described above is configured such that the fluororesin portion 1212 of the resin-metal portion 121 can significantly suppress the adhesion of the insertion and transportation object to the main body portion 12.

[0018] Thereby, not only can the resistance during insertion into earth and sand etc. be reduced, but also when dropping the scooped insertion and transportation object by throwing it away etc., or when scraping off earth and sand etc., the adhesion of the insertion and transportation object to the surface of the main body portion 12 can be significantly suppressed.

[0019] Note that the insertion and transportation object includes, in addition to earth and sand, compost, granular substances, snow, etc., and particularly exhibits a high adhesion-inhibiting effect on those with a high water content ratio and viscosity.

[0020] Subsequently, FIG. 2 shows an example of the formation mode of the main body portion 12 in the present embodiment. That is, as shown in FIG. 2(a), the fluororesin portion 1212 and the metal portion 1211 are press-joined to form the resin-metal portion 121.

[0021] Subsequently, as shown in Figure 2(b), the resin metal part 121 is press-formed according to the shape of the main body 12. In the illustrated embodiment, the surface of the main body 12 is made of the fluororesin part 1212 of the resin metal part 121. Then, as shown in Figure 2(c), the handle part 11 is attached to the main body 12.

[0022] When attaching the handle portion 11, it is possible to insert the handle portion 11 into the insertion portion formed in the main body portion 12 and fix it in place by tightening or fastening means. If the handle portion 11 is made of metal, it is also possible to fix it to the main body portion 12 by welding.

[0023] Furthermore, in this embodiment, as shown in Figures 1 and 2, the end surface 122 of the main body portion 12 is formed by the metal portion 1211 of the resin metal portion 121. More specifically, as shown in Figures 2(a) and 2(b), a region is provided at the end of the metal portion 1211 where the fluororesin portion 1212 is not joined, and this region is folded back as shown in Figure 2(b), thereby protecting the end of the fluororesin portion 1212.

[0024] As described above, the end surface 122 is formed by the metal part 1211, which protects the end of the fluororesin part 1212 at the tip of the main body part 12 where a large pressure is applied when inserting the shovel 1 into soil and sand, and makes it possible to suppress peeling and wear of the fluororesin part 1212.

[0025] The end surface 122 that protects the end of the fluororesin part 1212 may be provided only on the tip side of the main body part 12, or it may be provided on both the tip and side ends.

[0026] Furthermore, in this embodiment, the metal part 1211 of the resin metal part 121 that constitutes the main body 12 is made of a metal containing aluminum or beryllium. That is, by using a metal containing aluminum with a specific gravity of 2.70 g / cm³ or beryllium with a specific gravity of 1.85 g / cm³, a significant reduction in weight is achieved compared to a typical steel shovel (specific gravity: 7.87 g / cm³).

[0027] This reduces the workload, leading to labor savings, improved work efficiency, and a significant reduction in the physical and mental stress on workers.

[0028] Comparative experiments, as shown in Figure 3, were conducted to assess the adhesion-suppressing effect of the adhesion-suppressing shovel 1 of the present invention. Specifically, rusted iron plates, iron plates with a fluororesin portion 1212 bonded to one side, and iron plates with fluororesin portions 1212 bonded to both sides were used, and the pull-out load was investigated.

[0029] As shown in the comparative experiment results in Figure 4, the iron plates with fluororesin parts 1212 bonded to both sides (Cases 3-1 and 3-2) were the easiest to pull out, followed by iron plates with fluororesin parts 1212 bonded to one side (Cases 2-1 and 2-2), which were easier to pull out than rusted iron plates (Cases 1-1 and 1-2). In particular, a high adhesion suppression effect can be confirmed even with highly viscous viscosity blend materials.

[0030] Furthermore, as shown in Figure 5, it can be confirmed that, in the case of a steel plate with fluororesin parts 1212 bonded to both sides, the circumferential friction force can be reduced by approximately 40-50% compared to a rusted steel plate, regardless of the type of ground material. In particular, when inserting and transporting heavy soil with high viscosity, the effect of reducing the workload is very significant, leading to labor savings, improved work efficiency, and a substantial reduction in the physical and mental stress on workers.

[0031] Furthermore, as shown in Figure 6, the time required for workers to excavate the ground was compared using three types of shovels: round shovels, square shovels, and double shovels, comparing commercially available shovels without adhesion suppression measures, shovels equipped with a normal fluororesin part 1212, shovels with glass flakes in the fluororesin part 1212, and shovels with carbon in the fluororesin part 1212.

[0032] Figure 7 shows the comparison results of the time required for the excavation described above. Specifically, the time required to complete 10 excavations of Kanto loam ground was measured. As shown in the figure, when comparing the average time required for a commercially available shovel without adhesion suppression measures with the adhesion suppression shovel 1 consisting of the three types of fluororesin parts 1212 described above, the adhesion suppression shovel 1 of the present invention can reduce the construction time by about 10%, although there are individual differences.

[0033] In addition, a sensory evaluation test was conducted using a questionnaire for each item shown in Figure 8 for the workers who participated in the excavation test described above. Figures 9 and 10 show the results of the sensory evaluation test. As shown in Figure 9, the soil release from the shovel was good, except for some workers who used double shovels, and the majority of respondents expressed a desire to continue using the adhesion-suppressing shovel 1 of the present invention.

[0034] Furthermore, as shown in Figure 10, the double-ended shovel demonstrated a level of usability equal to or better than conventional shovels in terms of how easily it penetrated and pulled out of the ground, and how it handled when lifting soil, with the exception of some workers who used the double-ended shovel.

[0035] The above test results confirm the remarkable adhesion-inhibiting effect of the adhesion-inhibiting scoop 1 of the present invention.

[0036] Next, Figure 11 shows an example of how the main body portion 12 is formed in this embodiment, in which the fluororesin portion 1212 is formed on both the front and back surfaces of the main body portion 12. That is, as shown in Figure 11(a), the fluororesin portion 1212 and the metal portion 1211 that constitute the front surface of the main body portion 12 are press-bonded, and then the fluororesin portion 1212 and the metal portion 1211 that constitute the back surface of the main body portion 12 are press-bonded to form two resin-metal portions 121.

[0037] Subsequently, as shown in Figure 11(b), the metal parts 1211 of the two resin metal parts 121 are joined (bonded) to each other. Then, as shown in Figure 11(c), the joined (bonded) resin metal parts 121 are press-formed according to the shape of the main body part 12. This makes it possible to obtain an adhesion-suppressing scoop 1 in which fluororesin parts 1212 are formed on both the front and back surfaces of the main body part 12. Note that the method for forming the adhesion-suppressing scoop 1 in which fluororesin parts 1212 are formed on both the front and back surfaces of the main body part 12 as described above is merely an example and is not necessarily limited to this method.

[0038] (Other embodiments) Although one embodiment of the present invention has been described above, the adhesion-suppressing scoop of the present invention is not necessarily limited to the embodiments described above.

[0039] For example, the thickness of the resin-metal portion 121 of the main body 12 is not particularly limited, and its thickness can be changed as appropriate, as long as the necessary strength for the application can be ensured.

[0040] Furthermore, in addition to the materials mentioned above, the material type of the metal part 1211 in the resin metal part 121 can be stainless steel with excellent corrosion resistance or other steel materials.

[0041] Furthermore, polytetrafluoroethylene can be suitably used as the fluororesin part 1212 of the resin metal part 121. Specifically, this polytetrafluoroethylene has excellent heat resistance and chemical resistance, strong corrosion resistance to high concentrations of acids and alkalis, and is a material with a very low coefficient of friction.

[0042] Therefore, by using such materials in the fluororesin portion 1212, the adhesion-suppressing scoop of the present invention can maintain its adhesion-suppressing function even when handling materials such as highly alkaline concrete, sludge containing many corrosive components, or livestock manure.

[0043] Furthermore, PFA (perfluoroalkoxyalkane), FEP (perfluoroethylene propene copolymer), ETFE (ethylene tetrafluoroethylene copolymer), PVDF (polyvinylidene fluoride), PCTFE (polychlorotrifluoroethylene), ECTFE (ethylene chlorotrifluoroethylene copolymer), etc. can also be used as the fluororesin part 1212.

[0044] Although one embodiment and other embodiments have been described above, the scope of the present invention is indicated by the claims rather than by the descriptions of the embodiments above, and furthermore, all modifications within the meaning and scope of equivalence to the claims are included. In addition, the specific materials, dimensions, shapes, etc. described in the embodiments above can be modified to the extent that they solve the problems of the present invention. [Explanation of Symbols]

[0045] 1. Adhesion-inhibiting scoop 11 Handle 12 Main body 121 Resin and metal parts 1211 Metal parts 1212 Fluororesin part 122 End surface

Claims

1. In a shovel that prevents adhesion, having a main body that comes into contact with the object to be inserted and transported, and a handle connected to the main body, The main body is, It has a resin-metal part formed by joining a fluororesin part and a metal part. A scoop that prevents adhesion, characterized by its features.

2. At least one of the front and back surfaces of the main body is made of the fluororesin portion of the resin metal portion. The adhesion-suppressing scoop according to feature 1.

3. The end surface of the main body is formed by the metal portion of the resin metal part. The adhesion-suppressing scoop according to feature 1 or 2.

4. The aforementioned metal part is made of a metal containing aluminum or beryllium. The adhesion-suppressing scoop according to feature 1 or 2.

5. The aforementioned metal part is made of a metal containing aluminum or beryllium. The adhesion-suppressing scoop according to feature 3.

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