Aluminum hub low-pressure casting device and casting method

Abstract

The invention provides an aluminum hub low-pressure casting device and method, and relates to the field of hub casting, the aluminum hub low-pressure casting device comprises a bottom plate, a casting base, a supporting rod, a casting platform and a stirring liquid lifting structure, the upper end of the casting platform is provided with an upper mold pressing template, and the lower end of the upper mold pressing template is fixedly connected with an air inlet pipe; the stirring liquid lifting structure comprises a motor, the output end of the motor is fixedly connected with a rotating rod, the lower end of the rotating rod is fixedly connected with a gear shaft, the gear shaft is meshed with a circular outer gear, the lower end of the circular outer gear is fixedly connected with a turntable, the lower end of the turntable is fixedly connected with an outer ring, and the outer end of the outer ring is fixedly connected with multiple groups of stirring blades; a motor drives a rotating rod and a gear shaft to rotate, the gear shaft, a circular outer gear and an outer ring are connected to drive a stirring blade to stir a solution, the solution is prevented from being heated unevenly, a cooling liquid conveying pump in a cooling box conveys cooling liquid into a cooling pipe through a conveying pipe, and the cooling liquid is cooled through the cooling liquid conveying pump. And a hub cavity is cooled through a plurality of circles of cooling pipes in the lower die.

Description

Technical Field

[0001] The invention relates to the technical field of wheel hub casting, and in particular to a low-pressure casting device and a casting method for an aluminum wheel hub. Background Art

[0002] Wheel hub processing includes many process steps. One of the most important steps in the casting method is to pour the aluminum alloy solution into the mold and take it out after forming. A pouring head will be formed at the pouring port of the mold, which needs to be countersunk on a lathe.

[0003] The patent document CN 106111943 B was searched and disclosed a large impeller low-pressure casting method, cooling control process and exhaust system. The molded components and cores are dried and the impeller low-pressure casting mold is preheated. The casting material is placed in the casting device and heated and melted to form a casting solution. When the casting solution reaches the set temperature, the impeller casting mold is assembled and the impeller casting mold is connected to the casting device to form an impeller casting system. The low-pressure casting device is filled with low pressure along the set pressure curve. After the filling is completed, the impeller low-pressure casting mold is cooled. When the temperature of the impeller low-pressure casting mold drops to the set temperature, the impeller is taken out and cleaned. Adjusting the pressure and speed during the casting process can improve the insufficient pouring, adjusting the temperature of the aluminum liquid can control the oxidation of the aluminum liquid, and adjusting the cooling process can improve the shrinkage.

[0004] However, the inventors have discovered that this technical solution still has at least the following defects:

[0005] After the aluminum alloy wheel hub is cast, it is necessary to disassemble the aluminum alloy wheel hub separately and put it into a water pool for cooling. The method of disassembling the aluminum alloy wheel hub separately for cooling is troublesome to operate, which reduces the cooling rate of the aluminum alloy wheel hub. At the same time, the water in the water pool is easy to heat up during continuous use, thereby reducing the cooling effect of the aluminum alloy wheel hub. At the same time, when the solution is heated, the solution cannot be well mixed. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an aluminum wheel hub low-pressure casting device and a casting method.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a low-pressure casting device for an aluminum wheel hub, comprising a base plate, a casting base is arranged at the upper end of the base plate, four corners of the upper end of the base plate are fixedly connected with support rods, the upper end of the support rods is fixedly connected with a casting platform, a stirring and liquid-raising structure is arranged inside the casting base, an upper mold pressing template is arranged at the upper end of the casting platform, and an air intake pipe is fixedly connected to the lower end of the upper mold pressing template; the stirring and liquid-raising structure comprises a motor, a rotating rod is fixedly connected to the output end of the motor, a gear shaft is fixedly connected to the lower end of the rotating rod, a circular external gear is meshed with the gear shaft, a turntable is fixedly connected to the lower end of the circular external gear, an outer ring is fixedly connected to the lower end of the turntable, and a plurality of stirring blades are fixedly connected to the outer end of the outer ring.

[0008] In order to support the outer ring, the present invention has the following improvements: the casting base includes a heating device, a crucible is arranged inside the heating device, a riser is arranged inside the crucible, the upper end of the riser is fixedly connected to the hub cavity, and the lower side of the outer end of the riser is fixedly connected to a support block.

[0009] In order to evenly mix the solution, the present invention has the following improvements: a rotating rod is fixedly connected to the lower end of the gear shaft, the lower end of the rotating rod is rotatably connected to the upper end of the heating device, a support block is fixedly connected to the lower side of the outer end of the riser tube, the outer ring is rotatably connected to the support block, the outer ring is rotatably connected to the upper end of the crucible, and the turntable is sealed and rotated with the upper end of the riser tube.

[0010] In order to facilitate cooling of the mold, the present invention has improvements in that the upper end of the casting platform is fixedly connected to the lower mold, the relatively inner side of the support rod is fixedly connected to a cooling box, the upper end of the cooling box is provided with a delivery pipe, the delivery pipe passes through the right side of the lower mold and is fixedly connected to a cooling pipe, the cooling pipe is fixedly connected to the inner wall of the lower mold, the left side of the cooling pipe is fixedly connected to an output pipe, the end of the output pipe away from the lower mold is fixedly connected to a liquid collecting circulation box, a delivery pump is provided inside the liquid collecting circulation box, the output end of the delivery pump is fixedly connected to a delivery hose, and the end of the delivery hose away from the liquid collecting circulation box is fixedly connected to the cooling box.

[0011] In order to facilitate mold removal, the present invention has improvements in that the upper end of the casting platform is fixedly connected to a hydraulic rod, the upper end of the hydraulic rod is fixedly connected to an upper mold, the lower end of the upper mold is fixedly connected to an airbag pump, and the lower end of the airbag pump is fixedly connected to the upper end of the upper mold pressing template.

[0012] In order to increase the stability of the upper die pressing template, the present invention has an improvement in that the upper end of the upper die pressing template is fixedly connected with a plurality of sets of sliding rods, the sliding rods are slidably connected to the upper die, and the upper ends of the sliding rods are fixedly connected with anti-slip blocks.

[0013] In order to accelerate the transportation of the solution, the present invention is improved in that a molten magnesium liquid delivery box is arranged on the right side of the front end of the casting base, a solution inlet pipe is arranged on the upper end of the molten magnesium liquid delivery box, an air supercharger is fixedly connected to the upper end of the molten magnesium liquid delivery box, a solution delivery pipe is fixedly connected to the lower left end of the molten magnesium liquid delivery box, a one-way valve is arranged inside the solution delivery pipe, one end of the solution delivery pipe away from the molten magnesium liquid delivery box is fixedly connected to the upper end of the crucible, and a liquid adding pipe is fixedly connected to the upper end of the molten magnesium liquid delivery box.

[0014] A casting method of an aluminum wheel hub low-pressure casting device comprises the following steps:

[0015] Step 1: a molten magnesium liquid delivery box is provided to deliver the solution inside to the inside of the crucible, an air supercharger pressurizes the inside of the molten magnesium liquid delivery box, and delivers the solution inside the molten magnesium liquid delivery box to the inside of the crucible through a solution delivery pipe, and a one-way valve can prevent the solution from flowing back during delivery through the solution delivery pipe;

[0016] Step 2: After the solution inside the crucible is heated by the heating device, it is transported to the inside of the hub cavity by the liquid riser. While the solution is heated, the motor is started to drive the rotating rod and the gear shaft to rotate, and the outer ring is driven to rotate by the meshing of the gear shaft and the circular outer gear, and the solution is stirred by the stirring blade. When the outer ring rotates, the support block can support the outer ring, and the turntable can connect to the circular outer gear and support the outer ring at the same time, so that the solution can be stirred when the solution is heated to prevent uneven heating of the solution;

[0017] Step three, after the set wheel hub cavity and the upper mold pressing template are molded, the coolant is delivered to the inside of the cooling pipe through the delivery pipe by the coolant delivery pump inside the cooling box, and the wheel hub cavity is cooled by the multiple circles of cooling pipes inside the lower mold. The cooled coolant is delivered to the inside of the liquid collection circulation box through the output pipe on the left side of the cooling pipe. After the coolant in the liquid collection circulation box is cooled, it is delivered to the inside of the cooling box through the delivery hose for reuse; thereby the coolant is recycled.

[0018] Compared with the prior art, the advantages and positive effects of the present invention are:

[0019] 1. In the present invention, the motor drives the rotating rod and the gear shaft to rotate, and the gear shaft drives the circular outer gear to rotate, thereby driving the turntable and the outer ring to rotate, and the solution inside the crucible is stirred by the stirring blade, so as to prevent the solution inside the crucible from being heated unevenly when the crucible is heated by the heating device.

[0020] 2. In the present invention, after the hub cavity and the upper mold plate are molded, the coolant inside the cooling box is transported to the inside of the cooling pipe through the cooling box and the delivery pipe, so that the mold can be quickly cooled. The cooled coolant is recovered and cooled through the output pipe and the liquid collection circulation box. The cooled coolant is transported to the inside of the cooling box through the delivery hose for reuse; thereby, the coolant is recycled.

[0021] 3. In the present invention, the interior of the molten magnesium liquid delivery box is pressurized by an air supercharger, and the solution inside the molten magnesium liquid delivery box is delivered to the upper end of the crucible through a solution delivery pipe located at the lower end of the molten magnesium liquid delivery box to add the solution. At the same time, the solution can be added to the molten magnesium liquid delivery box through a solution inlet pipe at the upper end of the molten magnesium liquid delivery box, and the solution can be continuously added to the interior of the crucible. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a low-pressure casting device and a casting method for an aluminum wheel hub proposed by the present invention;

[0023] Figure 2 The present invention provides a schematic diagram of the internal structure of an aluminum wheel hub low-pressure casting device and a casting method;

[0024] Figure 3 The present invention provides a structural schematic diagram of a stirring and liquid-raising structure of a low-pressure casting device and a casting method for an aluminum wheel hub;

[0025] Figure 4 The present invention proposes a low-pressure casting device and casting method for an aluminum wheel hub Figure 2 A magnified image of point A;

[0026] Figure 5 The present invention provides a structural schematic diagram of a lower mold, a conveying pipe and a cooling pipe in a low-pressure casting device and a casting method for an aluminum wheel hub.

[0027] Legend:

[0028] 1. Bottom plate; 2. Support rod; 3. Casting base; 301. Heating device; 302. Crucible; 303. Lifting tube; 304. Hub cavity; 4. Casting platform; 5. Lower mold; 6. Upper mold pressing template; 7. Stirring and lifting structure; 701. Motor; 702. Rotating rod; 703. Gear shaft; 704. Rotating rod; 705. Circular outer gear; 706. Turntable; 707. Outer ring; 708. Stirring blade; 709. Support block; 8. Upper mold; 9. Sliding rod; 10. Hydraulic rod; 11. Inlet pipe; 12. Air bag pump; 13. Cooling box; 14. Delivery pipe; 15. Cooling pipe; 17. Molten magnesium liquid delivery box. DETAILED DESCRIPTION

[0029] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0031] Example:

[0032] Reference Figure 1-5 The present invention provides a technical solution: a low-pressure casting device for an aluminum wheel hub, comprising a bottom plate 1, a casting base 3 is arranged at the upper end of the bottom plate 1, four corners of the upper end of the bottom plate 1 are fixedly connected with support rods 2, the upper end of the support rods 2 is fixedly connected with a casting platform 4, a stirring and liquid-raising structure 7 is arranged inside the casting base 3, an upper mold pressing template 6 is arranged at the upper end of the casting platform 4, and an air intake pipe 11 is fixedly connected to the lower end of the upper mold pressing template 6; the stirring and liquid-raising structure 7 comprises a motor 701, a rotating rod 702 is fixedly connected to the output end of the motor 701, a gear shaft 703 is fixedly connected to the lower end of the rotating rod 702, a circular external gear 705 is meshed with the gear shaft 703, a rotating disk 706 is fixedly connected to the lower end of the circular external gear 705, an outer ring 707 is fixedly connected to the lower end of the rotating disk 706, and a plurality of stirring blades 708 are fixedly connected to the outer end of the outer ring 707

[0033] Reference Figure 1-5 The casting base 3 includes a heating device 301, a crucible 302 is arranged inside the heating device 301, a liquid riser 303 is arranged inside the crucible 302, the upper end of the liquid riser 303 is fixedly connected to the hub cavity 304, and the lower side of the outer end of the liquid riser 303 is fixedly connected to the support block 709

[0034] Reference Figure 1-5 The lower end of the gear shaft 703 is fixedly connected with a rotating rod 704, the lower end of the rotating rod 704 is rotatably connected to the upper end of the heating device 301, the lower side of the outer end of the riser tube 303 is fixedly connected with a support block 709, the outer ring 707 is rotatably connected to the support block 709, the outer ring 707 is rotatably connected to the upper end of the crucible 302, and the turntable 706 is sealed and rotatably connected to the upper end of the riser tube 303.

[0035] Reference Figure 1-5The upper end of the casting platform 4 is fixedly connected with the lower mold 5, the relatively inner side of the support rod 2 is fixedly connected with the cooling box 13, the upper end of the cooling box 13 is provided with a delivery pipe 14, the delivery pipe 14 passes through the right side of the lower mold 5 and is fixedly connected with a cooling pipe 15, the cooling pipe 15 is fixedly connected to the inner wall of the lower mold 5, the left side of the cooling pipe 15 is fixedly connected with an output pipe, the end of the output pipe away from the lower mold 5 is fixedly connected with a liquid collection circulation box, a delivery pump is provided inside the liquid collection circulation box, the output end of the delivery pump is fixedly connected with a delivery hose, and the end of the delivery hose away from the liquid collection circulation box is fixedly connected to the cooling box 13

[0036] Reference Figure 1-5 The upper end of the casting platform 4 is fixedly connected to a hydraulic rod 10, the upper end of the hydraulic rod 10 is fixedly connected to an upper mold 8, the lower end of the upper mold 8 is fixedly connected to an air bag pump 12, and the lower end of the air bag pump 12 is fixedly connected to the upper end of the upper mold press template 6

[0037] Reference Figure 1-5 The upper end of the upper die plate 6 is fixedly connected with a plurality of slide bars 9, the slide bars 9 are slidably connected with the upper die 8, and the upper end of the slide bars 9 is fixedly connected with an anti-dropping block

[0038] Reference Figure 1-5 A molten magnesium liquid delivery box 16 is arranged on the right side of the front end of the casting base 3, a solution inlet pipe is arranged on the upper end of the molten magnesium liquid delivery box 16, an air supercharger is fixedly connected to the upper end of the molten magnesium liquid delivery box 16, a solution delivery pipe is fixedly connected to the lower left end of the molten magnesium liquid delivery box 16, a one-way valve is arranged inside the solution delivery pipe, one end of the solution delivery pipe away from the molten magnesium liquid delivery box 16 is fixedly connected to the upper end of the crucible 302, and a liquid adding pipe is fixedly connected to the upper end of the molten magnesium liquid delivery box 16

[0039] A casting method of an aluminum wheel hub low-pressure casting device comprises the following steps:

[0040] Step 1: The molten magnesium liquid delivery box 16 is provided to deliver the solution inside to the inside of the crucible 302. The air supercharger pressurizes the inside of the molten magnesium liquid delivery box 16 to deliver the solution inside the molten magnesium liquid delivery box 16 to the inside of the crucible 302 through the solution delivery pipe. The one-way valve can prevent the solution from flowing back during delivery through the solution delivery pipe.

[0041] Step 2: After the solution inside the crucible 302 is heated by the heating device 301, it is transported to the inside of the hub cavity 304 by the liquid riser 303. While the solution is heated, the motor 701 is started to drive the rotating rod 702 and the gear shaft 703 to rotate, and the outer ring 707 is driven to rotate by the meshing of the gear shaft 703 and the circular outer gear 705. The solution is stirred by the stirring blade 708. When the outer ring 707 rotates, the support block 709 can support the outer ring 707. The turntable 706 can connect to the circular outer gear 705 and support the outer ring 707 at the same time. The solution can be stirred when the solution is heated to prevent uneven heating of the solution.

[0042] Step three, after the hub cavity 304 and the upper die plate 6 are die-cast, the coolant delivery pump inside the cooling box 13 delivers the coolant through the delivery pipe 14 to the inside of the cooling pipe 15, and the hub cavity 304 is cooled by the multi-circle cooling pipe 15 inside the lower mold 5. The cooled coolant is delivered to the inside of the liquid collection circulation box through the output pipe on the left side of the cooling pipe 15. After the coolant in the liquid collection circulation box is cooled, it is delivered to the inside of the cooling box 13 through the delivery hose for reuse; thereby the coolant is circulated.

[0043] Working principle: the solution is added through the solution inlet pipe molten magnesium liquid delivery box 16, and after addition, it is transported to the inside of the crucible 302 through the air supercharger and the solution delivery pipe, and then heated by the heating device 301, and then transported to the inside of the hub cavity 304 by the liquid riser 303. While the solution is heated, the motor 701 is started to drive the rotating rod 702 and the gear shaft 703 to rotate, and the outer ring 707 is driven to rotate through the meshing of the gear shaft 703 and the circular outer gear 705. The solution is stirred by the stirring blade 708. When the outer ring 707 rotates, the support block 709 can support the outer ring 707, and the turntable 706 can connect to the circular outer gear 705 and support the outer ring 707 at the same time. The solution is stirred while being heated to prevent uneven heating of the solution; after the upper die pressing template 6 is pressed down to the upper end of the lower die 5, the heated solution is transported to the inside of the hub cavity 304 through the liquid riser 303, and the hub cavity 304 and the upper die pressing template 6 are pressed into shape; the coolant is transported to the inside of the cooling tube 15 through the delivery tube 14 by the coolant delivery pump inside the cooling box 13, and the hub cavity 304 is cooled by the multi-circle cooling tube 15 inside the lower die 5; the cooled coolant is transported to the inside of the liquid collecting circulation box through the output tube on the left side of the cooling tube 15; after the coolant in the liquid collecting circulation box is cooled, it is transported to the inside of the cooling box 13 through the delivery hose for reuse; thereby the coolant is circulated.

[0044] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in other forms. Any technician familiar with the profession may use the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes and apply them to other fields. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A low-pressure casting device for an aluminum wheel hub, comprising a base plate (1), characterized in that: A casting base (3) is provided at the upper end of the base plate (1), support rods (2) are fixedly connected to the four corners of the upper end of the base plate (1), a casting platform (4) is fixedly connected to the upper end of the support rods (2), a stirring and liquid-raising structure (7) is provided inside the casting base (3), an upper die pressing template (6) is provided at the upper end of the casting platform (4), and an air intake pipe (11) is fixedly connected to the lower end of the upper die pressing template (6); The stirring and liquid-raising structure (7) comprises a motor (701), the output end of the motor (701) is fixedly connected to a rotating rod (702), the lower end of the rotating rod (702) is fixedly connected to a gear shaft (703), the gear shaft (703) is meshed with a circular external gear (705), the lower end of the circular external gear (705) is fixedly connected to a rotating disk (706), the lower end of the rotating disk (706) is fixedly connected to an outer ring (707), and the outer end of the outer ring (707) is fixedly connected to multiple groups of stirring blades (708).

2. The low-pressure casting device for aluminum wheel hub according to claim 1 is characterized in that: The casting base (3) comprises a heating device (301), a crucible (302) is arranged inside the heating device (301), a riser (303) is arranged inside the crucible (302), the upper end of the riser (303) is fixedly connected to the hub cavity (304), and the lower side of the outer end of the riser (303) is fixedly connected to a support block (709).

3. The low-pressure casting device for aluminum wheel hub according to claim 2, characterized in that: The lower end of the gear shaft (703) is fixedly connected to a rotating rod (704), the lower end of the rotating rod (704) is rotatably connected to the upper end of the heating device (301), the lower side of the outer end of the riser (303) is fixedly connected to a support block (709), the outer ring (707) is rotatably connected to the support block (709), the outer ring (707) is rotatably connected to the upper end of the crucible (302), and the turntable (706) is sealed and rotatable with the upper end of the riser (303).

4. The low-pressure casting device for aluminum wheel hub according to claim 3 is characterized in that: The upper end of the casting platform (4) is fixedly connected to the lower mold (5), the relatively inner side of the support rod (2) is fixedly connected to a cooling box (13), the upper end of the cooling box (13) is provided with a delivery pipe (14), the delivery pipe (14) passes through the right side of the lower mold (5) and is fixedly connected to a cooling pipe (15), the cooling pipe (15) is fixedly connected to the inner wall of the lower mold (5), the left side of the cooling pipe (15) is fixedly connected to an output pipe, the end of the output pipe away from the lower mold (5) is fixedly connected to a liquid collecting circulation box, a delivery pump is provided inside the liquid collecting circulation box, the output end of the delivery pump is fixedly connected to a delivery hose, and the end of the delivery hose away from the liquid collecting circulation box is fixedly connected to the cooling box (13).

5. The low-pressure casting device for aluminum wheel hub according to claim 3 is characterized in that: The upper end of the casting platform (4) is fixedly connected to a hydraulic rod (10), the upper end of the hydraulic rod (10) is fixedly connected to an upper mold (8), the lower end of the upper mold (8) is fixedly connected to an air bag pump (12), and the lower end of the air bag pump (12) is fixedly connected to the upper end of the upper mold pressing template (6).

6. The low-pressure casting device for aluminum wheel hub according to claim 5, characterized in that: The upper end of the upper die pressing template (6) is fixedly connected to a plurality of sets of sliding rods (9), the sliding rods (9) are slidably connected to the upper die (8), and the upper end of the sliding rods (9) is fixedly connected to an anti-slip block.

7. The low-pressure casting device for aluminum wheel hub according to claim 3, characterized in that: A molten magnesium liquid delivery box (16) is arranged on the right side of the front end of the casting base (3); a solution inlet pipe is arranged on the upper end of the molten magnesium liquid delivery box (16); an air supercharger is fixedly connected to the upper end of the molten magnesium liquid delivery box (16); a solution delivery pipe is fixedly connected to the lower left end of the molten magnesium liquid delivery box (16); a one-way valve is arranged inside the solution delivery pipe; an end of the solution delivery pipe away from the molten magnesium liquid delivery box (16) is fixedly connected to the upper end of the crucible (302); and a liquid adding pipe is fixedly connected to the upper end of the molten magnesium liquid delivery box (16).

8. A casting method for an aluminum wheel hub low-pressure casting device according to claims 1-7, characterized in that: The following steps are involved: Step 1: The molten magnesium liquid delivery box (16) is provided to deliver the solution inside to the inside of the crucible (302); the air supercharger pressurizes the inside of the molten magnesium liquid delivery box (16) to deliver the solution inside the molten magnesium liquid delivery box (16) to the inside of the crucible (302) through the solution delivery pipe; and the one-way valve can prevent the solution from flowing back during delivery through the solution delivery pipe; Step 2: After the solution in the crucible (302) is heated by the heating device (301), it is transported to the inside of the hub cavity (304) by the liquid riser (303). While the solution is being heated, the motor (701) is started to drive the rotating rod (702) and the gear shaft (703) to rotate, and the outer ring (707) is driven to rotate by the meshing of the gear shaft (703) and the circular outer gear (705). The solution is stirred by the stirring blade (708). When the outer ring (707) rotates, the support block (709) can support the outer ring (707), and the turntable (706) can support the outer ring (707) while being connected to the circular outer gear (705). The solution can be stirred when the solution is heated to prevent uneven heating of the solution. Step three, after the hub cavity (304) and the upper die plate (6) are die-cast, the coolant delivery pump inside the cooling box (13) delivers the coolant through the delivery pipe (14) to the inside of the cooling pipe (15), and the hub cavity (304) is cooled by the multiple turns of cooling pipes (15) inside the lower die (5). The cooled coolant is delivered to the inside of the liquid collection circulation box through the output pipe on the left side of the cooling pipe (15). After the coolant in the liquid collection circulation box is cooled, it is delivered to the inside of the cooling box (13) through the delivery hose for reuse; thereby the coolant is circulated.

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