CN204249278U - A kind of injection machine injection screw structure - Google Patents
A kind of injection machine injection screw structure Download PDFInfo
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- CN204249278U CN204249278U CN201420637427.8U CN201420637427U CN204249278U CN 204249278 U CN204249278 U CN 204249278U CN 201420637427 U CN201420637427 U CN 201420637427U CN 204249278 U CN204249278 U CN 204249278U
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- 238000002347 injection Methods 0.000 title claims abstract description 32
- 239000007924 injection Substances 0.000 title claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 28
- 230000006835 compression Effects 0.000 claims abstract description 25
- 238000007906 compression Methods 0.000 claims abstract description 25
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 238000001746 injection moulding Methods 0.000 claims abstract description 14
- 238000005524 ceramic coating Methods 0.000 claims abstract description 11
- 238000001125 extrusion Methods 0.000 claims abstract description 4
- 238000000265 homogenisation Methods 0.000 claims description 13
- 239000000956 alloy Substances 0.000 claims description 3
- 229910002110 ceramic alloy Inorganic materials 0.000 claims description 3
- 229910010293 ceramic material Inorganic materials 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 229920011532 unplasticized polyvinyl chloride Polymers 0.000 abstract description 17
- 239000000155 melt Substances 0.000 abstract description 8
- 239000011248 coating agent Substances 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 5
- 238000002425 crystallisation Methods 0.000 abstract description 3
- 230000008025 crystallization Effects 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 description 7
- 239000007790 solid phase Substances 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
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- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
本实用新型公开一种注塑机用注射螺杆结构，包括由入料段、压缩段和均化段组成的螺杆本体、混炼段和由过胶介子、过胶圈和过胶头连接为一体形成的锥形挤压段，锥形挤压段可以提高注射精度及注射效率；在螺杆本体表面涂覆有陶瓷涂层，涂层表面光滑饱满，能加快UPVC熔料的推进；螺杆本体上的螺槽从入料段至均化段依次由深变浅，使螺杆本体得到一个合适的压缩比，能加快熔融的UPVC在螺槽内的推进；在入料段、压缩段和均化段的螺槽底部设置若干凸钉，在螺杆旋转时，凸钉能推动UPVC熔料前进，加快熔料的推进；在混炼段表面设置多个销钉，销钉能够对物料进行撕裂和解取向，使物料的各项性质一致，减少结晶。
The utility model discloses an injection screw structure for an injection molding machine, which comprises a screw body composed of a feeding section, a compression section and a homogenizing section, a mixing section, and a rubber-passing meson, a rubber-passing ring and a rubber-passing head connected as a whole. The tapered extrusion section can improve the injection accuracy and injection efficiency; the surface of the screw body is coated with a ceramic coating, the surface of the coating is smooth and full, which can accelerate the advancement of the UPVC melt; the screw on the screw body The groove from the feeding section to the homogenizing section gradually changes from deep to shallow, so that the screw body can get a suitable compression ratio, which can accelerate the advancement of the molten UPVC in the screw channel; the screw in the feeding section, compression section and homogenizing section A number of convex nails are set at the bottom of the tank. When the screw rotates, the convex nails can push the UPVC melt forward and accelerate the advancement of the melt; multiple pins are set on the surface of the mixing section, and the pins can tear and de-orient the material, so that the material The properties are consistent and crystallization is reduced.
Description
技术领域 technical field
本实用新型涉及注塑机领域，特别涉及一种应用于UPVC原料注塑的注塑机用注射螺杆结构。 The utility model relates to the field of injection molding machines, in particular to an injection screw structure for injection molding machines used in injection molding of UPVC raw materials.
背景技术 Background technique
注塑机的物料熔融是通过熔胶筒组件来实现的，通过安装在熔胶筒组件内螺杆将物料向前输送，再利用发热装置将物料熔融。而UPVC材料是一种熔体粘度高，流动性差的原料。即使提高注塑压力和熔体温度，其流动性的变化也不大，另外UPVC的成型温度与热分解温度非常接近，能够进行成型的温度范围比较窄，是一种难于成型的温度。在用常规注射螺杆的注塑机将UPVC注射成型生产制品时，会出现较高程度的温控异常，且由于胶料无法及时从熔胶筒挤压完全，造成产品表面光泽不良，发黄，黑点等严重不良。 The material melting of the injection molding machine is realized through the melt barrel assembly, and the material is conveyed forward through the screw installed in the melt barrel assembly, and then the material is melted by the heating device. The UPVC material is a raw material with high melt viscosity and poor fluidity. Even if the injection pressure and melt temperature are increased, its fluidity does not change much. In addition, the molding temperature of UPVC is very close to the thermal decomposition temperature, and the temperature range that can be molded is relatively narrow, which is a temperature that is difficult to mold. When using conventional injection screw injection molding machine to inject UPVC to produce products, there will be a high degree of temperature control abnormality, and because the rubber material cannot be fully extruded from the melted rubber cylinder in time, the surface gloss of the product will be poor, yellow and black. The point is seriously bad.
实用新型内容 Utility model content
本实用新型的主要目的是克服上述缺陷，提供一种能高效快速地将UPVC原料混合熔融，且能比较完全的将注射螺杆中的原料挤压出来的UPVC高效混炼精密注射螺杆结构。 The main purpose of the utility model is to overcome the above-mentioned defects and provide a UPVC high-efficiency mixing precision injection screw structure that can efficiently and quickly mix and melt UPVC raw materials, and can relatively completely extrude the raw materials in the injection screw.
为解决上述问题，本实用新型所采用的技术方案是： In order to solve the above problems, the technical solution adopted in the utility model is:
一种注塑机用注射螺杆结构，包括螺杆本体、依次连接在所述螺杆本体头部的过胶介子、过胶圈和过胶头，所述螺杆本体表面设有送料螺纹，所述螺杆本体从末端向头部方向依次包括入料段、压缩段和均化段，所述过胶介子、所述过胶圈和所述过胶头连接形成一体结构：锥形挤压段；在所述螺杆本体表面涂覆有由陶瓷材料和合金粉烧结而成的陶瓷涂层，所述入料段上的螺槽深度大于所述压缩段上的螺槽深度，所述压缩段上的螺槽深度大于所述均化段上的螺槽深度，所述压缩段上的螺槽深度沿物料移动方向逐渐变小，所述入料段和所述均化段上的螺槽深度固定保持不变，在所述入料段、压缩段和均化段的螺槽底部设有若干凸钉；所述注射螺杆结构还包括连接在所述均化段前端的混炼段，所述混炼段设置在所述均化段与所述锥形挤压段之间，所述混炼段的表面分布有若干间隔设置的销钉，所述销钉在所述螺杆本体的径向绕所述螺杆本体的轴线呈若干圆圈设置，所述销钉在所述螺杆本体的轴向上呈螺旋条排列。 An injection screw structure for an injection molding machine, comprising a screw body, a glue joint, a rubber ring and a glue head connected to the head of the screw body in sequence, the surface of the screw body is provided with a feeding screw thread, and the screw body is connected from The end includes a feeding section, a compression section, and a homogenizing section in turn toward the head. The glue-passing meson, the rubber-passing ring and the glue-passing head are connected to form an integrated structure: a conical extrusion section; The surface of the main body is coated with a ceramic coating sintered by ceramic material and alloy powder, the depth of the screw groove on the feeding section is greater than the depth of the screw groove on the compression section, and the depth of the screw groove on the compression section is greater than The screw groove depth on the homogenization section, the screw groove depth on the compression section gradually decreases along the material moving direction, the screw groove depths on the feeding section and the homogenization section are fixed and remain unchanged, and the The bottom of the screw groove of the feeding section, the compression section and the homogenizing section is provided with several convex nails; the injection screw structure also includes a mixing section connected to the front end of the homogenizing section, and the mixing section is arranged on the Between the homogenizing section and the conical extruding section, the surface of the mixing section is distributed with several pins arranged at intervals, and the pins are in the radial direction of the screw body around the axis of the screw body. The pins are arranged in a circle, and the pins are arranged in a helical strip in the axial direction of the screw body.
优选地，所述销钉呈棱形体、矩形体或梯形体。 Preferably, the pin is in the shape of a prism, a rectangle or a trapezoid.
优选地，所述凸钉呈圆锥状、圆台状、棱锥状或棱台状。 Preferably, the convex nail is in the shape of a cone, a cone, a pyramid or a pyramid.
优选地，所述陶瓷涂层的厚度为1mm ～2mm。 Preferably, the thickness of the ceramic coating is 1 mm to 2 mm.
本实用新型的注塑机用注射螺杆结构的有益效果为： The beneficial effects of the injection screw structure for injection molding machine of the present utility model are:
通过将螺杆本体上的螺槽设置为从入料段至均化段依次由深变浅，且在压缩段上的螺槽深度沿物料移动方向逐渐变小，使螺杆本体得到一个合适的压缩比，从而使熔融的UPVC在螺槽内加快推进。 By setting the screw grooves on the screw body to gradually become shallow from the feeding section to the homogenization section, and the depth of the screw grooves on the compression section gradually decreases along the material moving direction, so that the screw body can get a suitable compression ratio , so that the molten UPVC advances faster in the screw groove.
通过在螺杆本体表面涂覆陶瓷涂层，涂层表面光滑饱满，能加快UPVC熔料的推进；而且，陶瓷涂层具有抗腐蚀性和耐磨损性，能提高螺杆本体整体的硬度和耐高温性，使螺杆具有抗腐蚀性强、耐磨损性高、耐高温的特点，从而使注射螺杆能保持正常工作，提高塑胶制品的效率及合格率。 By coating the surface of the screw body with a ceramic coating, the surface of the coating is smooth and full, which can accelerate the advancement of UPVC melt; moreover, the ceramic coating has corrosion resistance and wear resistance, which can improve the overall hardness and high temperature resistance of the screw body It has the characteristics of strong corrosion resistance, high wear resistance and high temperature resistance, so that the injection screw can maintain normal work and improve the efficiency and pass rate of plastic products.
通过在入料段、压缩段和均化段的螺槽底部设置若干凸钉，在螺杆旋转时，凸钉能推动UPVC熔料前进，加快熔料的推进。 By setting a number of convex nails at the bottom of the screw grooves in the feeding section, compression section and homogenizing section, when the screw rotates, the convex nails can push the UPVC melt forward and accelerate the advancement of the melt.
通过在混炼段表面设置多个销钉，且销钉在螺杆本体的轴向上呈螺旋条排列，当物料进入混炼段时，销钉能够对物料进行撕裂和解取向，使物料进行多次分割、分流而增加对物料的混炼、均化和填加剂的分散性，使物料的各项性质一致，减少结晶；销钉还能够将固体物料打碎，破坏熔体，打乱固体和液体的两相流动，并将料流反复地分开，改变料流在料筒与螺杆之间的方向和速度分布，使固相和液相充分混合，增大固相与液相之间的传热面积，并对物料产生一定阻力和摩擦剪切，使固相熔融。 By setting multiple pins on the surface of the mixing section, and the pins are arranged in a helical strip in the axial direction of the screw body, when the material enters the mixing section, the pins can tear and de-orientate the material, so that the material can be divided multiple times, The split flow can increase the mixing, homogenization and additive dispersion of the material, so that the properties of the material are consistent and reduce crystallization; the pin can also break the solid material, destroy the melt, and disrupt the two phases of solid and liquid. Phase flow, and repeatedly separate the material flow, change the direction and speed distribution of the material flow between the barrel and the screw, fully mix the solid phase and the liquid phase, increase the heat transfer area between the solid phase and the liquid phase, And produce a certain resistance and friction shear to the material, so that the solid phase melts.
通过将过胶介子、过胶圈和过胶头连接形成一体结构的锥形挤压段，可以提高注射精度及注射效率，通过螺杆后的原料，在螺杆的推挤下，原料一次性射出，减少了在螺杆内停留的时间，使其符合UPVC的注射要求，射胶量可达到95%。 By connecting the glue-passing meson, the rubber-passing ring and the rubber-passing head to form a tapered extrusion section with an integrated structure, the injection accuracy and injection efficiency can be improved. The raw material after passing through the screw is pushed by the screw, and the raw material is injected at one time. The residence time in the screw is reduced to meet the injection requirements of UPVC, and the injection volume can reach 95%.
附图说明 Description of drawings
图1为本实用新型的注塑机用注射螺杆结构的一实施例的注射螺杆结构的结构示意图。 FIG. 1 is a structural schematic diagram of an injection screw structure of an embodiment of an injection screw structure for an injection molding machine of the present invention.
本实用新型目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。 The realization of the purpose of the utility model, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.
具体实施方式 Detailed ways
应当理解，此处所描述的具体实施例仅仅用以解释本实用新型，并不用于限定本实用新型。 It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.
参照图1，提出本实用新型的注塑机用注射螺杆结构的一实施例，该注塑机用注射螺杆结构包括螺杆本体10、依次连接在螺杆本体10头部的过胶介子、过胶圈和过胶头，在螺杆本体10表面设有送料螺纹。螺杆本体10从末端向头部方向依次包括入料段11、压缩段12和均化段13，入料段11用于负责预热与塑料固体的输送及推挤；压缩段12用于将塑料原料熔融、混炼、剪切压缩与加压排气，塑料在此段会熔解，体积会缩小，从而此段的压缩比的设计很重要；均化段13用于将熔料混炼、输送、计量。 Referring to Fig. 1, an embodiment of the injection screw structure for injection molding machine of the present invention is proposed. The rubber head is provided with a feeding thread on the surface of the screw body 10 . The screw body 10 includes a feed section 11, a compression section 12, and a homogenization section 13 from the end to the head. The feed section 11 is used for preheating and conveying and pushing plastic solids; Material melting, mixing, shear compression and pressurized exhaust, the plastic will melt in this section and the volume will shrink, so the design of the compression ratio in this section is very important; the homogenization section 13 is used to knead and transport the molten material , Measurement.
在螺杆本体10表面涂覆有由陶瓷材料和合金粉烧结而成的陶瓷涂层14，陶瓷涂层14的厚度为1mm ～2mm。通过在螺杆本体10表面涂覆陶瓷涂层14，涂层表面光滑饱满，能加快UPVC熔料的推进；而且，陶瓷涂层14具有抗腐蚀性和耐磨损性，能提高螺杆本体10整体的硬度和耐高温性，使螺杆具有抗腐蚀性强、耐磨损性高、耐高温的特点，从而使注射螺杆能保持正常工作，提高塑胶制品的效率及合格率。 The surface of the screw body 10 is coated with a ceramic coating 14 sintered from ceramic material and alloy powder, and the thickness of the ceramic coating 14 is 1 mm to 2 mm. By coating the ceramic coating 14 on the surface of the screw body 10, the surface of the coating is smooth and full, which can accelerate the advancement of the UPVC melt; moreover, the ceramic coating 14 has corrosion resistance and wear resistance, which can improve the stability of the screw body 10 as a whole. Hardness and high temperature resistance make the screw have the characteristics of strong corrosion resistance, high wear resistance and high temperature resistance, so that the injection screw can maintain normal work and improve the efficiency and pass rate of plastic products.
螺杆本体10上的螺槽设置为从入料段11至均化段13依次由深变浅，入料段11上的螺槽深度大于压缩段12上的螺槽深度，压缩段12上的螺槽深度大于均化段13上的螺槽深度，且压缩段12上的螺槽深度沿物料移动方向逐渐变小，入料段11和均化段13上的螺槽深度固定保持不变。通过将螺杆本体10上的螺槽设置为从入料段11至均化段13依次由深变浅，能使螺杆本体10得到一个合适的压缩比，从而使熔融的UPVC在螺槽内加快推进。 The screw grooves on the screw body 10 are set to gradually become shallower from the feeding section 11 to the homogenizing section 13, the screw groove depth on the feeding section 11 is greater than the screw groove depth on the compression section 12, and the screw groove depth on the compression section 12 The groove depth is greater than the screw groove depth on the homogenization section 13, and the screw groove depth on the compression section 12 gradually decreases along the material moving direction, and the screw groove depths on the feeding section 11 and the homogenization section 13 are fixed and remain unchanged. By setting the screw groove on the screw body 10 from the feeding section 11 to the homogenizing section 13, the depth becomes shallower in turn, so that the screw body 10 can get a suitable compression ratio, so that the molten UPVC can be accelerated in the screw groove .
在入料段11、压缩段12和均化段13的螺槽底部设有若干凸钉15，该凸钉15呈圆锥状、圆台状、棱锥状或棱台状设置，在螺杆旋转时，凸钉15能推动UPVC熔料前进，加快熔料的推进。 At the bottom of the screw groove of the feeding section 11, the compression section 12 and the homogenizing section 13, several convex nails 15 are arranged. The convex nails 15 are conical, conical, pyramidal or pyramidal. The nail 15 can push the UPVC melt forward and accelerate the advance of the melt.
注射螺杆结构还包括连接在均化段13前端的混炼段20，混炼段20设置在均化段13与锥形挤压段30之间，混炼段20的表面分布有若干间隔设置的销钉21，销钉21在螺杆本体10的径向绕螺杆本体10的轴线呈若干圆圈设置，销钉21在螺杆本体10的轴向上呈螺旋条排列。该销钉21呈棱形体、矩形体或梯形体设置。通过在混炼段20表面设置多个销钉21，且销钉21在螺杆本体10的轴向上呈螺旋条排列，当物料进入混炼段20时，销钉21能够对物料进行撕裂和解取向，使物料进行多次分割、分流而增加对物料的混炼、均化和填加剂的分散性，使物料的各项性质一致，减少结晶；销钉21还能够将固体物料打碎，破坏熔体，打乱固体和液体的两相流动，并将料流反复地分开，改变料流在料筒与螺杆之间的方向和速度分布，使固相和液相充分混合，增大固相与液相之间的传热面积，并对物料产生一定阻力和摩擦剪切，使固相熔融。 The injection screw structure also includes a kneading section 20 connected to the front end of the homogenizing section 13. The kneading section 20 is arranged between the homogenizing section 13 and the conical extruding section 30. The surface of the kneading section 20 is distributed with several intervals. The pins 21 are arranged in several circles around the axis of the screw body 10 in the radial direction of the screw body 10 , and the pins 21 are arranged in a helical strip in the axial direction of the screw body 10 . The pin 21 is arranged in the form of a prism, a rectangle or a trapezoid. By setting a plurality of pins 21 on the surface of the mixing section 20, and the pins 21 are arranged in a spiral strip in the axial direction of the screw body 10, when the material enters the mixing section 20, the pins 21 can tear and de-orient the material, so that The material is divided and divided multiple times to increase the mixing, homogenization and additive dispersion of the material, so that the properties of the material are consistent and crystallization is reduced; the pin 21 can also break the solid material and destroy the melt. Disrupt the two-phase flow of solid and liquid, and repeatedly separate the material flow, change the direction and speed distribution of the material flow between the barrel and the screw, fully mix the solid and liquid phases, and increase the solid and liquid phases. The heat transfer area between them produces a certain resistance and frictional shear to the material to melt the solid phase.
该过胶介子、过胶圈和过胶头连接形成一体结构的锥形挤压段30，可以提高注射精度及注射效率。通过螺杆后的原料，在螺杆的推挤下，原料一次性射出，减少了在螺杆内停留的时间，使其符合UPVC的注射要求，射胶量可达到95%。 The glue-passing meson, the rubber-passing ring and the glue-passing head are connected to form a tapered extruding section 30 with an integral structure, which can improve injection precision and injection efficiency. After passing through the screw, under the push of the screw, the raw material is injected at one time, reducing the residence time in the screw, making it meet the injection requirements of UPVC, and the injection volume can reach 95%.
以上所述仅为本实用新型的优选实施例，并非因此限制本实用新型的专利范围，凡是利用本实用新型说明书及附图内容所作的等效结构变换，或直接或间接运用在其他相关的技术领域，均同理包括在本实用新型的专利保护范围内。 The above are only preferred embodiments of the present utility model, and are not therefore limiting the patent scope of the present utility model. All equivalent structural transformations made by using the utility model specification and accompanying drawings are directly or indirectly used in other related technologies. Fields are all included in the scope of patent protection of the utility model in the same way.
Claims (4)
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420637427.8U CN204249278U (en) | 2014-10-30 | 2014-10-30 | A kind of injection machine injection screw structure |
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| CN201420637427.8U CN204249278U (en) | 2014-10-30 | 2014-10-30 | A kind of injection machine injection screw structure |
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| CN204249278U true CN204249278U (en) | 2015-04-08 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105328868A (en) * | 2015-11-13 | 2016-02-17 | 积康螺杆制造（上海）股份有限公司 | Screw-type vortex mixing nozzle |
| CN106448920A (en) * | 2016-08-31 | 2017-02-22 | 惠州市亚创域科技有限公司 | Material extrusion threaded rod for conveying high temperature PA material of three layers of insulating wires |
| CN110103431A (en) * | 2019-05-31 | 2019-08-09 | 广东伊之密精密注压科技有限公司 | A kind of plastic-injection moulding machine and its injection screw |
-
2014
- 2014-10-30 CN CN201420637427.8U patent/CN204249278U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105328868A (en) * | 2015-11-13 | 2016-02-17 | 积康螺杆制造（上海）股份有限公司 | Screw-type vortex mixing nozzle |
| CN106448920A (en) * | 2016-08-31 | 2017-02-22 | 惠州市亚创域科技有限公司 | Material extrusion threaded rod for conveying high temperature PA material of three layers of insulating wires |
| CN106448920B (en) * | 2016-08-31 | 2024-12-06 | 池州市谦跃信息技术有限公司 | An extrusion screw for conveying high-temperature PA material of three-layer insulation wire |
| CN110103431A (en) * | 2019-05-31 | 2019-08-09 | 广东伊之密精密注压科技有限公司 | A kind of plastic-injection moulding machine and its injection screw |
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Address after: 528415 No. 110, Zhaoyi Road, Xiaolan Town, Zhongshan City, Guangdong Province Patentee after: Guangdong Lijin Plastic Machinery Intelligent Manufacturing Co.,Ltd. Address before: 528421 Guangfu Avenue, Dongsheng Town, Zhongshan City, Guangdong Province Patentee before: Zhongshan Lijin Machinery Co.,Ltd. |
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