CN217327480U - Heat dissipation device for diesel engine of excavator - Google Patents
Heat dissipation device for diesel engine of excavator Download PDFInfo
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- CN217327480U CN217327480U CN202220805295.XU CN202220805295U CN217327480U CN 217327480 U CN217327480 U CN 217327480U CN 202220805295 U CN202220805295 U CN 202220805295U CN 217327480 U CN217327480 U CN 217327480U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The utility model relates to a heat dissipation device for a diesel engine of an excavator, wherein the distance between the left side and the right side of the whole heat dissipation device is smaller than the distance between the upper side and the lower side of the heat dissipation device; the heat dissipation device comprises a water radiator, an oil radiator and a middle-cooling radiator; the water radiator is hollow, a first radiating core body is arranged in the water radiator, a water inlet is formed in the upper part of the water radiator, and a water outlet is formed in the lower part of the water radiator; the oil radiator is hollow, a second radiating core body is arranged in the oil radiator, an oil inlet is formed in the upper part of the oil radiator, an oil outlet is formed in the lower part of the oil radiator, and the left side of the oil radiator is fixedly connected with the right side of the water radiator; the intercooling radiator is hollow, a third radiating core body is arranged in the intercooling radiator, an air inlet is arranged at the left end, an air outlet is arranged at the right end, and the bottom of the intercooling radiator is fixedly connected with the top of the water radiator and the top of the oil radiator respectively; the left end of the intercooling radiator is flush with the left side of the water radiator, and the right end of the intercooling radiator is flush with the right side of the oil radiator.
Description
Technical Field
The utility model relates to an excavator spare part technical field especially relates to a heat abstractor for diesel engine of excavator.
Background
The radiator for the diesel engine of the excavator is arranged at the front side or the rear side of the diesel engine of the excavator, and can respectively radiate various media (water, oil and air) flowing out of the diesel engine so as to ensure that the diesel engine can normally work.
The heat radiator for the diesel engine of the existing excavator generally comprises an oil radiator, a water radiator and a middle-cooling radiator, wherein the oil radiator, the water radiator and the middle-cooling radiator are distributed in a parallel mode, the left side of the water radiator is fixedly connected with the right side of the middle-cooling radiator, and the right side of the water radiator is fixedly connected with the left side of the oil radiator to form a heat radiation structure sealed at the front side or the rear side of the diesel engine. Various media flow into the corresponding radiator from the upper part of the corresponding radiator and then flow out from the lower part of the corresponding radiator. Because different media have different heat dissipation requirements, the widths of the oil radiator, the water radiator and the intercooling radiator are different. The air has the lowest heat dissipation requirement, so that the width of the intercooling radiator is relatively narrow and is matched with the caliber of an air inlet/an air outlet of the diesel engine. In order to ensure the tightness, the height of the intercooling radiator in the vertical direction is forced to be increased, and the top end of the intercooling radiator needs to be flush with the top end of the water radiator/oil radiator, so that more redundancy exists in the heat radiation function of the intercooling radiator.
Therefore, how to reduce the manufacturing cost of the heat dissipation device for the diesel engine of the excavator becomes a technical problem to be solved in the field on the premise of meeting the respective heat dissipation requirements of different media.
SUMMERY OF THE UTILITY MODEL
For the realization under the prerequisite that satisfies the respective heat dissipation demand of different medium, reduce the purpose of excavator's heat abstractor for the diesel engine's manufacturing cost, the utility model provides a heat abstractor for the diesel engine of excavator.
In order to realize the purpose of the utility model, the distance between the left side and the right side of the whole heat dissipation device for the diesel engine of the excavator is smaller than the distance between the upper side and the lower side;
the heat dissipation device comprises a water radiator, an oil radiator and a middle-cooling radiator;
the water radiator is hollow, a first radiating core body is arranged in the water radiator, a water inlet is formed in the upper part of the water radiator, and a water outlet is formed in the lower part of the water radiator;
the oil radiator is hollow, a second radiating core body is arranged in the oil radiator, an oil inlet is formed in the upper part of the oil radiator, an oil outlet is formed in the lower part of the oil radiator, and the left side of the oil radiator is fixedly connected with the right side of the water radiator;
the intercooling radiator is hollow, a third radiating core body is arranged in the intercooling radiator, an air inlet is arranged at the left end, an air outlet is arranged at the right end, and the bottom of the intercooling radiator is fixedly connected with the top of the water radiator and the top of the oil radiator respectively;
the left end of the intercooling radiator is flush with the left side of the water radiator, and the right end of the intercooling radiator is flush with the right side of the oil radiator.
In one embodiment, the distance between the left side and the right side of the oil radiator, the distance between the left side and the right side of the water radiator and the distance between the upper side and the lower side of the intercooling radiator are sequentially decreased.
In one embodiment, the distance between the left side and the right side of the whole heat dissipation device is 850-870 mm; the distance between the upper side and the lower side is 1190-1210 mm;
wherein, the distance between the left side and the right side of the water radiator is 390-400mm, and the distance between the upper side and the lower side is 1040-1050 mm;
the distance between the left side and the right side of the oil radiator is 460-470mm, and the distance between the upper side and the lower side of the oil radiator is 1040-1050 mm;
the distance between the left end and the right end of the intercooling radiator is 850-870mm, and the distance between the upper side and the lower side of the intercooling radiator is 150-160 mm.
In one embodiment, the distance between the left side and the right side of the whole heat dissipation device is 1010 and 1020mm, and the distance between the upper side and the lower side of the heat dissipation device is 1040 and 1050 mm;
wherein, the distance between the left side and the right side of the water radiator is 460-470mm, and the distance between the upper side and the lower side is 880-900 mm;
the distance between the left side and the right side of the oil radiator is 550mm, and the distance between the upper side and the lower side of the oil radiator is 880 mm and 900 mm;
the distance between the left end and the right end of the intercooling radiator is 1010-1020mm, and the distance between the upper side and the lower side of the intercooling radiator is 150-160 mm.
In one embodiment, the water inlet and the water outlet are arranged on the same side of the water radiator;
the air inlet and the air outlet are arranged on the same side of the intercooling radiator.
In one specific embodiment, the first heat dissipation core includes first fins;
the first fins are multiple and are arranged in pairs in parallel;
the second radiating core comprises second fins;
the second fins are multiple and are arranged in pairs in parallel;
the third radiating core comprises third fins;
the third fin is a plurality of, sets up in proper order in the range upon range of.
In one embodiment, the first fin, the second fin and the third fin are made of metal.
The utility model has the advantages that: the utility model discloses a heat abstractor for diesel engine of excavator is through setting up water radiator, oil radiator and well cold radiator, and the water radiator can dispel the heat to the water that flows from the engine, and oil radiator can dispel the heat to the oil that flows from the engine, and well cold radiator can dispel the heat to the well cold that flows from the engine. The distance between the left side and the right side of the whole radiating device is smaller than the distance between the upper side and the lower side, the left end of the intercooling radiator is flush with the left side of the water radiator, and the right end of the intercooling radiator is flush with the right side of the oil radiator. In this way, the height of the intercooling radiator is not limited by the height of the water radiator and the oil radiator, but by the width of the water radiator and the oil radiator. On the premise of meeting respective heat dissipation requirements of different media, the size of the intercooling heat radiator can be reduced, the manufacturing cost is reduced, and the heat dissipation function is not redundant. Meanwhile, the air inlet and the air outlet are respectively arranged at the left end and the right end of the intercooling radiator and respectively correspond to the air outlet arranged at the left side of the diesel engine and the air inlet arranged at the right side of the diesel engine, so that the length of a pipeline consumed when the diesel engine is connected with the intercooling radiator is favorably reduced, and the problem of complex pipeline layout is further avoided. In addition, compared with the traditional heat dissipation device for the diesel engine, the relative positions of the intercooling radiator and the water radiator and the intercooling radiator and the oil radiator are changed, so that the distance between the left end and the right end of the intercooling radiator is smaller than the distance between the upper side and the lower side of the traditional intercooling radiator, the flow of air in the intercooling radiator is shortened, the power loss is reduced, the pressure difference between inflow air and outflow air is effectively controlled, and the requirement of the diesel engine is met.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a heat dissipation device for a diesel engine of an excavator according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the terms "top", "bottom", "inner", "outer", "axis", "circumferential" and the like refer to the orientation or positional relationship shown in the drawings, which are only for convenience of description of the present invention or simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," "engaged," "hinged," and the like are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other suitable relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Referring to fig. 1, according to an embodiment of the present invention, a heat dissipation apparatus for a diesel engine of an excavator has a smaller distance between the left and right sides than between the upper and lower sides. The heat dissipating device includes a water radiator 110, an oil radiator 120, and a mid-cooling radiator 130. The water radiator 110 is a hollow structure, and a first heat dissipation core is disposed inside the water radiator. The water radiator 110 has a water inlet 111 at its upper portion and a water outlet 112 at its lower portion. The oil radiator 120 has a hollow structure, and a second heat dissipation core is disposed inside the oil radiator. An oil inlet 121 is formed in the upper portion of the oil radiator 120, and an oil outlet 122 is formed in the lower portion. The left side of the oil radiator 120 is fixedly connected with the right side of the water radiator 110. The intercooling heat sink 130 is a hollow structure, and a third heat dissipation core is disposed inside the intercooling heat sink. The left end of the intercooling radiator 130 is provided with an air inlet 131, and the right end is provided with an air outlet 132. The bottom of the intercooling radiator 130 is fixedly connected with the top of the water radiator 110 and the top of the oil radiator 120 respectively. Wherein the left end of the intercooling radiator 130 is flush with the left side of the water radiator 110, and the right end is flush with the right side of the oil radiator 120.
In this embodiment, water flowing out of the diesel engine flows into the water radiator 110 through the water inlet 111, flows through the first heat dissipation core for heat dissipation, flows out of the water outlet 112 of the water radiator 110, and flows back into the diesel engine. The oil flowing out of the diesel engine flows into the oil radiator 120 from the oil inlet 121, flows through the second heat dissipation core body for heat dissipation, flows out of the oil outlet 122 of the oil radiator 120, and flows back into the diesel engine. The air flowing out of the diesel engine flows into the intercooler radiator 130 from the air inlet 131, flows through the third heat dissipation core body for heat dissipation, flows out of the air outlet 132 of the intercooler radiator 130, and flows back into the diesel engine. It should be noted that the flow of water in the water radiator 110 is from top to bottom, and the flow of oil in the oil radiator 120 is from top to bottom. The air flow direction in the intercooler radiator 130 is from left to right or right to left. It should be noted that, the specific connection structure when the water radiator 110 is fixedly connected with the oil radiator 120, the intercooling radiator 130 is fixedly connected with the water radiator 110, and the intercooling radiator 130 is fixedly connected with the oil radiator 120 is the prior art, and is not described herein again.
Based on the characteristic that the distance between the left side and the right side of the whole heat dissipation device is smaller than the distance between the upper side and the lower side, namely, the characteristic that the width of the heat dissipation device is smaller than the height, the intercooling radiator 130 is arranged at the tops of the water radiator 110 and the oil radiator 120, so that the left end of the intercooling radiator 130 is flush with the left side of the water radiator 110, and the right end of the intercooling radiator 130 is flush with the right side of the oil radiator 120. In this way, the height of the inter-cooling radiator 130 is not limited to the height of the water radiator 110 and the oil radiator 120, but is limited to the width of the water radiator 110 and the oil radiator 120. On the premise of meeting respective heat dissipation requirements of different media, the size of the intercooling heat sink 130 can be reduced, the manufacturing cost is reduced, and redundancy of heat dissipation functions can not occur.
Meanwhile, the air inlet 131 and the air outlet 132 are respectively arranged at the left end and the right end of the intercooling radiator 130 and respectively correspond to the air outlet 132 arranged at the left side of the diesel engine and the air inlet 131 arranged at the right side of the diesel engine, so that the length of a pipeline consumed when the diesel engine is connected with the intercooling radiator 130 is favorably reduced, and the problem of complex pipeline layout is further avoided.
In addition, compared with the traditional heat dissipation device for the diesel engine, the relative positions of the intercooling radiator 130 and the water radiator 110 and the intercooling radiator 130 and the oil radiator 120 are changed, so that the distance between the left end and the right end of the intercooling radiator 130 is smaller than the distance between the upper side and the lower side of the traditional intercooling radiator, the flow of air in the intercooling radiator 130 is shortened, the power loss is reduced, the pressure difference between inflow air and outflow air is effectively controlled, and the requirement of the diesel engine is met.
In an embodiment of the present invention, the distance between the left and right sides of the oil radiator 120, the distance between the left and right sides of the water radiator 110, and the distance between the upper and lower sides of the inter-cooling radiator 130 are gradually decreased. Therefore, different heat dissipation requirements of different media can be met.
It should be noted that, the distance between the left and right sides of the conventional heat dissipation device is 1012mm, and the distance between the upper and lower sides is 1048 mm. The distance between the left side and the right side of the traditional intercooling radiator is 151mm, and the distance between the upper side and the lower side of the traditional intercooling radiator is 1048 mm. The distance between the left side and the right side of the traditional water radiator is 396mm, and the distance between the upper side and the lower side is 1048 mm. The left and right sides of the traditional oil radiator are 465mm apart, and the upper and lower sides are 1048mm apart.
In an embodiment of the present invention, the distance between the left and right sides of the heat dissipation device is 850-870mm, and the distance between the upper and lower sides is 1190-1210 mm. Wherein, the distance between the left and right sides of the water radiator 110 is 390-400mm, and the distance between the upper and lower sides is 1040-1050 mm. The interval between the left and right sides of the oil radiator 120 is 460 + 470mm, and the interval between the upper and lower sides is 1040 + 1050 mm. The distance between the left and right ends of the intercooling radiator 130 is 850-870mm, and the distance between the upper and lower sides is 150-160 mm. Specifically, the distance between the left side and the right side of the whole heat dissipation device is 861mm, and the distance between the upper side and the lower side of the heat dissipation device is 1199 mm. Wherein, the distance between the left and right sides of the water radiator 110 is 396mm, and the distance between the upper and lower sides is 1048 mm. The interval between the left and right sides of the oil radiator 120 is 465mm, and the interval between the upper and lower sides is 1048 mm. The distance between the left end and the right end of the intercooling radiator 130 is 861mm, and the distance between the upper side and the lower side is 151 mm.
In this embodiment, the overall size of the heat sink is changed. The size of the water radiator 110 is the same as that of a conventional water radiator, the size of the oil radiator 120 is the same as that of a conventional oil radiator, the size of the intercooling radiator 130 is reduced relative to that of a conventional intercooling radiator, the width of the whole radiator is reduced, and the height of the radiator is increased. The flow of air in the intercooler radiator 130 is shortened, and the power loss is reduced.
In an embodiment of the present invention, the distance between the left and right sides of the heat dissipation device is 1010 and 1020mm, and the distance between the upper and lower sides is 1040 and 1050 mm. Wherein, the distance between the left and right sides of the water radiator 110 is 460-470mm, and the distance between the upper and lower sides is 880-900 mm. The distance between the left and right sides of the oil heat radiator 120 is 550mm, and the distance between the upper and lower sides is 880 mm and 900 mm. The distance between the left end and the right end of the intercooling radiator 130 is 1010-1020mm, and the distance between the upper side and the lower side is 150-160 mm. Specifically, the distance between the left side and the right side of the whole heat dissipation device is 1012mm, and the distance between the upper side and the lower side of the heat dissipation device is 1048 mm. Wherein, the distance between the left and right sides of the water radiator 110 is 465mm, and the distance between the upper and lower sides is 897 mm. The interval between the left and right sides of the oil radiator 120 is 546mm, and the interval between the upper and lower sides is 897 mm. The distance between the left end and the right end of the intercooling radiator 130 is 1012mm, and the distance between the upper side and the lower side is 151 mm.
In this embodiment, the overall size of the heat sink is unchanged. The water radiator 110 is wider in width and lower in height than a conventional water radiator. The oil radiator 120 is wider in width and lower in height than the conventional oil radiator. The intercooled radiator 130 is slightly reduced in size relative to a conventional intercooled radiator. In this way, the flow of air in the intercooler radiator 130 becomes short. The flow of water in the water-cooled radiator is shortened, and the number of passages is increased. The flow of oil in the oil-cooled radiator is shortened, the number of passages is increased, the heat dissipation requirements of various media are better balanced, and various power losses are reduced.
In an embodiment of the present invention, the water inlet 111 and the water outlet 112 are disposed on the same side of the water radiator 110, so as to be respectively communicated with the water inlet 112 and the water outlet 112 of the diesel engine. The air inlet 131 and the air outlet 132 are disposed on the same side of the intercooler radiator 130 so as to be respectively communicated with an air inlet and an air outlet of the diesel engine. The oil inlet 121 and the oil outlet 122 may be disposed on the same side of the oil-cooled radiator, or may be disposed on different sides of the oil-cooled radiator.
In an embodiment of the present invention, the first heat dissipation core includes a plurality of first fins, and two of the first fins are disposed side by side. The second radiating core body comprises a plurality of second fins which are arranged in pairs in parallel. The third radiating core body comprises a plurality of third fins which are sequentially stacked. The specific connection mode and the specific connection structure adopted during connection of the fins are the prior art, and are not described herein again.
In an embodiment of the present invention, the first fin, the second fin and the third fin are made of metal, specifically, copper or aluminum, which has a better heat dissipation effect.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," "one specific embodiment," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, a schematic representation of the term does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to substitute or change the technical solution and the inventive concept equally within the scope of the present invention.
Claims (7)
1. The heat dissipation device for the diesel engine of the excavator is characterized in that the distance between the left side and the right side of the whole heat dissipation device is smaller than the distance between the upper side and the lower side of the heat dissipation device;
the heat dissipation device comprises a water radiator, an oil radiator and a middle-cooling radiator;
the water radiator is hollow, a first radiating core body is arranged in the water radiator, a water inlet is formed in the upper part of the water radiator, and a water outlet is formed in the lower part of the water radiator;
the oil radiator is hollow, a second radiating core body is arranged in the oil radiator, the upper part of the oil radiator is provided with an oil inlet, the lower part of the oil radiator is provided with an oil outlet, and the left side of the oil radiator is fixedly connected with the right side of the water radiator;
the intercooling radiator is hollow, a third radiating core body is arranged in the intercooling radiator, an air inlet is arranged at the left end, an air outlet is arranged at the right end, and the bottom of the intercooling radiator is fixedly connected with the top of the water radiator and the top of the oil radiator respectively;
the left end of the intercooling radiator is flush with the left side of the water radiator, and the right end of the intercooling radiator is flush with the right side of the oil radiator.
2. The heat dissipating apparatus for the diesel engine of the excavator according to claim 1, wherein a distance between left and right sides of the oil radiator, a distance between left and right sides of the water radiator, and a distance between upper and lower sides of the inter-cooling radiator are sequentially decreased in a decreasing order.
3. The heat sink for the diesel engine of an excavator according to claim 1, wherein a distance between the left and right sides of the heat sink as a whole is 850-870 mm; the distance between the upper side and the lower side is 1190-1210 mm;
wherein, the distance between the left side and the right side of the water radiator is 390-400mm, and the distance between the upper side and the lower side of the water radiator is 1040-1050 mm;
the distance between the left side and the right side of the oil radiator is 460-470mm, and the distance between the upper side and the lower side of the oil radiator is 1040-1050 mm;
the distance between the left end and the right end of the intercooling radiator is 850-870mm, and the distance between the upper side and the lower side of the intercooling radiator is 150-160 mm.
4. The heat dissipating device for the diesel engine of the excavator as set forth in claim 1, wherein the distance between the left and right sides of the heat dissipating device is 1010 and 1020mm, and the distance between the upper and lower sides is 1040 and 1050 mm;
wherein, the distance between the left side and the right side of the water radiator is 460-470mm, and the distance between the upper side and the lower side is 880-900 mm;
the distance between the left side and the right side of the oil radiator is 550mm, and the distance between the upper side and the lower side of the oil radiator is 880 mm and 900 mm;
the distance between the left end and the right end of the intercooling radiator is 1010-1020mm, and the distance between the upper side and the lower side of the intercooling radiator is 150-160 mm.
5. The heat dissipating apparatus for the diesel engine of the excavator according to any one of claims 1 to 4, wherein the water inlet and the water outlet are provided on the same side of the water radiator;
the air inlet and the air outlet are arranged on the same side of the intercooling radiator.
6. The heat dissipating apparatus for the diesel engine of the excavator according to any one of claims 1 to 4, wherein the first heat dissipating core includes first fins;
the first fins are multiple and are arranged in pairs in parallel;
the second heat dissipation core comprises second fins;
the second fins are multiple and are arranged in pairs in parallel;
the third heat dissipation core comprises third fins;
the third fin is a plurality of, stacks gradually the setting.
7. The heat sink for the diesel engine of the excavator according to claim 6, wherein the first fin, the second fin, and the third fin are made of a metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220805295.XU CN217327480U (en) | 2022-04-08 | 2022-04-08 | Heat dissipation device for diesel engine of excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220805295.XU CN217327480U (en) | 2022-04-08 | 2022-04-08 | Heat dissipation device for diesel engine of excavator |
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| Publication Number | Publication Date |
|---|---|
| CN217327480U true CN217327480U (en) | 2022-08-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220805295.XU Active CN217327480U (en) | 2022-04-08 | 2022-04-08 | Heat dissipation device for diesel engine of excavator |
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| CN (1) | CN217327480U (en) |
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- 2022-04-08 CN CN202220805295.XU patent/CN217327480U/en active Active
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Address after: 266500 No. 75 East Huanghe Road, Huangdao District, Qingdao City, Shandong Province Patentee after: Lovol Heavy Industry Group Co.,Ltd. Address before: 266500 No. 75 East Huanghe Road, Huangdao District, Qingdao City, Shandong Province Patentee before: LOVOL Engineering Machinery Group Co.,Ltd. |