Shot processing device and heat dissipation method

Abstract

To provide a shot processing device which can exhaust heat to the outside with a simple structure when an interior of the device is headed up, and to provide a heat exhausting method.SOLUTION: A shot processing device 1 performs shot processing of a wiring material W and includes: a housing 15; and side walls 2 which form parts of an outer wall of the housing 15, are disposed so as to be located in a vertical direction and open to the outside at its lower end part side and its upper end part side, and respectively have spaces K being communication spaces. Atmospheric air is introduced from an opening P at the lower end part side and discharged from an opening Q at the upper end part side.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a shot processing apparatus and a heat dissipation method. [Background technology]

[0002] For surface processing such as shot blasting to remove scale, burrs, and surface roughening of workpieces, and shot peening to improve fatigue strength, shot processing equipment is used that projects or sprays shot material onto the surface of the workpiece to process the workpiece (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. WO2012 / 090531 Summary of the Invention [Problem to be solved by the invention]

[0004] The shot medium that does not collide with the workpiece collides into the housing of the shot processing device without decelerating. The energy from the collision is converted into heat, which can cause the interior of the device to become very hot depending on the size of the workpiece. In particular, in shot processing devices for processing wire rods, the wire rod is thinner than the projection area of ​​the shot medium, so the device becomes very hot. To improve the wire processing speed, some shot processing devices use multiple shot mechanisms, causing the wire to pass through the projection area of ​​the shot medium by each shot mechanism at high speed. In this case, high energy is applied inside the device's housing. Furthermore, because shot processing devices for processing wire rods are compact, they have a smaller surface area and poorer heat dissipation than larger devices. Therefore, the heat generated by the shot medium colliding with the interior of the housing with high energy accumulates inside, further increasing the temperature. In devices that can become very hot, a cover made of insulating material is installed on the exterior of the device to prevent workers from getting burned. However, this insulating material keeps the interior of the device warm, further reducing heat dissipation. When the inside of the device is in such a high temperature state, the motor, the shot medium transport mechanism, etc. may be exposed to an environment exceeding their heat resistance temperature, which may significantly reduce their durability.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and the problem that the present invention aims to solve is to provide a shot processing apparatus and a heat dissipation method that can dissipate heat to the outside with a simple structure when the temperature inside the apparatus rises. [Means for solving the problem]

[0006] One aspect of the present invention is a shot blasting apparatus for blasting wire rod. This shot blasting apparatus includes a housing and side walls that form part of the outer wall of the housing and are positioned vertically, with the lower and upper ends of the side walls each opening to the outside and having a gap that is a communicating space. Air is introduced through the opening on the lower end and exhausted through the opening on the upper end. A shot blasting apparatus for processing wire rods is prone to have high temperatures inside the apparatus. In one aspect of the present invention, a gap is provided that guides air upward along the side wall from an opening at the lower end toward an opening at the upper end. Because the temperature in this gap is higher than that of the outside air, an ascending air current (i.e., an air current guided into the gap) is generated near the opening at the lower end. The introduced outside air exchanges heat within the gap and is then discharged from the opening at the upper end. In this way, heat inside the apparatus can be dissipated to the outside with a simple structure.

[0007] In one aspect of the present invention, the housing further includes a heat generating element that generates heat inside the housing when the shot processing device is driven, and the sidewall includes a panel and a heat insulating material provided on the surface of the panel that faces the heat generating element. Since heat insulating material is provided on the inner surface of the side wall, measures can be taken to prevent workers from getting burned.

[0008] In one aspect of the present invention, a plurality of shot mechanisms are provided. Each shot mechanism is provided with a drive motor that drives a shot-projecting impeller. The drive motors of some of the plurality of shot mechanisms have their rotation shafts positioned vertically. A cooling fan is fixed to the lower end of the rotation shaft. The casing of the cooling fan is disposed adjacent to the side wall. A motor with a cooling fan fixed to the lower end of the rotating shaft is positioned close to the side wall with the rotating shaft positioned vertically, so that the motor's cooling fan can promote the flow of air from the opening on the lower end side of the side wall to the opening on the upper end side, further improving heat dissipation efficiency.

[0009] Another aspect of the present invention is a heat dissipation method for a shot processing apparatus that performs shot processing by projecting a shot medium onto a wire. The shot processing apparatus includes a housing and a sidewall. The sidewall constitutes a part of the outer wall of the housing and has a gap with upper and lower ends open between it and the heat generating element. This heat dissipation method introduces air through the opening on the lower end side and releases the air to the outside through the opening on the upper end side. In another aspect of the present invention, heat inside the device can be discharged to the outside with a simple structure.

[0010] According to one aspect of the present invention, a shot processing apparatus includes a transport mechanism and a ventilator. The transport mechanism transports projected shot medium from a lower portion to an upper portion of a housing. The ventilator is provided in the housing. Air introduced into the housing from the ventilator bypasses the transport mechanism and is released to the outside through an opening including an opening in the gap. Since the transfer mechanism, which has many heat-sensitive parts, can be less exposed to high temperatures, breakdowns in the shot processing device can be reduced. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a shot processing apparatus and a heat dissipation method that can dissipate heat to the outside with a simple structure when the temperature inside the apparatus rises. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a schematic side view showing the configuration of a shot processing device according to an embodiment of the present invention; [Figure 2] FIG. 2 is a plan view of the shot processing apparatus of FIG. [Figure 3] FIG. 2 is an enlarged view of the portion A enclosed by the dashed line in FIG. [Figure 4] FIG. 4 is a view seen from the direction of arrow B in FIG. 3. DETAILED DESCRIPTION OF THE INVENTION

[0013] (Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a schematic diagram showing the configuration of a shot processing apparatus 1 according to an embodiment of the present invention, as seen from the side. Fig. 2 is a plan view of the shot processing apparatus 1 of Fig. 1. Fig. 3 is an enlarged view of the portion indicated by the dashed line A in Fig. 1. Fig. 4 is a view seen from the direction of arrow B in Fig. 3.

[0014] In this specification, "projection" includes both cases where the shot medium T is projected by centrifugal force from an impeller, as in the case of using an impeller-type shot mechanism 3, and cases where the shot medium T is sprayed by compressed air or wind force, as in the case of using an air-type shot mechanism 3.

[0015] As shown in FIGS. 1 and 2, the shot processing apparatus 1 includes a housing 15 that defines a processing chamber, and a blow-down chamber 17 that is provided adjacent to the housing 15. A transport mechanism (a bucket elevator 14 in this embodiment) that forms part of the circulation device is provided adjacent to the center of the housing 15. The housing 15 includes a shot mechanism 3 and a drive motor 9 that drives the shot mechanism 3. The workpiece W is a wire rod having a linear shape. It is carried into the housing 15 by carry-in rollers 11 and carried out of the blow-down chamber 17 by carry-out rollers 13. The shot mechanism 3 in this embodiment is an impeller, and the drive motor 9 rotates the impeller 3 via a belt 8 shown in FIGS. 3 and 4 to project shot media T onto the wire rod W. The impellers 3 and drive motors 9 are provided in a housing 15 in total of four pairs: impellers 3a, 3a that project the shot medium T from the horizontal left-right direction and drive motors 9a, 9a that drive them, and impellers 3b, 3b that project the shot medium T from the vertical up-down direction and drive motors 9b, 9b that drive them.

[0016] The shot processing device 1 in this embodiment is a device that processes a wire rod W. Since this device processes a relatively small-scale workpiece W, the projection area is set narrow and the device itself is formed compactly. Therefore, because the device itself is small, it has a structure that makes it difficult to dissipate heat. Furthermore, because the workpiece W is small, the projected shot medium T does not collide with the workpiece W but directly collides with the inside of the housing 15, and its kinetic energy is converted into thermal energy, causing a temperature rise. Therefore, because the device is small, not only is the heat dissipation from each driving mechanism poor, but the energy of the shot medium T also makes it easier for the device to heat up.

[0017] Furthermore, the shot mechanism 3, bucket elevator 14, drive motor 9, etc. cause heat generation within the device. In the above configuration, the shot mechanism 3, bucket elevator 14, drive motor 9, etc. constitute heat generating elements.

[0018] 1 and 2, the shot processing device 1 has a side wall 2 that forms part of the outer wall of a housing 15 and is positioned in the vertical direction. The lower and upper ends of this side wall 2 are open to the outside and have a gap K, which is a communicating space. Air is introduced through opening P on the lower end side and exhausted through opening Q on the upper end side.

[0019] As shown in Figures 3 and 4, the side wall 2 is configured to include a panel 2a and a heat insulating material 2b provided on the surface of the panel 2a that faces the drive motor 9. The drive motors 9 of some of the shot mechanisms 3 among the multiple shot mechanisms 9 described above have their rotation axes J positioned in the vertical direction, and a cooling fan 4 is fixed to the lower end of the rotation axis J, with its casing 6 disposed close to the side wall 2. The cooling fan 4 cools the drive motor 9 with airflow generated by the rotation of the fan.

[0020] In the above configuration, ventilator 12a is provided at the end of housing 15 above the impeller 3a side, and ventilator 12b is provided near bucket elevator 14. These ventilators 12a and 12b take in the atmosphere outside housing 15 into housing 15, and the taken-in air flows from the upper part of housing 15 to the inside, then rises and passes through duct 16, where it is collected by a dust collector (not shown) and then released to the outside. Meanwhile, a ventilator 12c is provided above the bucket elevator 14. This ventilator 12c takes in the air from outside the housing 15 along the bucket elevator 14 into the housing 15, and then the air rises and passes through a duct 16, where it is collected in a dust collector (not shown) and then released to the outside. Furthermore, the air taken into the housing 15 is guided by the cooling fan 4 into the gap K in the side wall 2 and is released to the outside through the opening Q.

[0021] Next, the operation of the shot blasting apparatus 1 will be described with reference to Figures 1 and 2. The wire rod W is carried into a housing 15, which is a processing chamber, and is continuously transported from the housing 15 to the blow-down chamber 17 from the carry-in rollers 11 toward the carry-out rollers 13 so as to be carried out via the blow-down chamber 13. Inside the housing 15, there are provided impellers 3a, 3a that project shot blast media T onto the wire rod W from horizontally left and right directions, and impellers 3b, 3b that project shot blast media T onto the wire rod W from up and down directions.

[0022] As shown in FIG. 2, the wire rod W carried into the processing chamber 15 by the carry-in rollers 11 is subjected to shot processing by having shot media T thrown from the right by the impeller 3a. After the shot processing from the right has been completed, the wire rod W is further transported to the back of the housing 15 (left side of the drawing) and is further shot processed by having shot media T thrown from the left by the impeller 3a. After the shot processing in the left-right direction has been completed, the wire rod W is then transported to the left side of the drawing in FIG. 1, and is further shot processed by having shot media T thrown from above by the impeller 3b. After the shot processing from above has been completed, the wire rod W is further transported to the back of the housing 15 (left side of the drawing) and is further shot processed by having shot media T thrown from below by the impeller 3b.

[0023] After the shot processing in the four directions (up, down, left, and right), the wire rod W is transported to the blow-down chamber 17, where dust and shot media are separated using brushes and scrapers (not shown) and compressed air, etc., leaving the wire rod clean, and the wire rod W is then transported outside the shot processing device 1 by the discharge rollers 13.

[0024] The circulation device including the bucket elevator 14 is a device for circulating and reusing shot media T within the housing 15. The circulation device of this embodiment includes a lower screw conveyor (not shown) located below the housing 15, the bucket elevator 14 located adjacent to the center of the housing 15, and an upper screw conveyor (not shown) located above the housing 15 and transporting shot media T from the bucket elevator 14 to the top of the shot mechanism 3. The shot media T shot by the shot mechanism 3 inside the housing 15 are accumulated at the bottom of the housing 15 using an inclined surface or the like. The lower screw conveyor located at the bottom of the housing 15 transports the accumulated shot media T to the bucket elevator 14. The bucket elevator 14 scoops up the shot media T collected by the lower screw conveyor and transports the shot media T from the bottom to the top of the housing 15. The shot media T transported to the top of the device are thrown from the top of the bucket elevator 14 into a chute (not shown) and transported via the chute to the upper screw conveyor. The upper screw conveyor supplies the shot media T to each shot mechanism 3 via an introduction hose (not shown).

[0025] A gap K is provided between the drive motor 9 and the side wall 2, which is disposed adjacent to the heat-generating elements, including the drive motor 9, inside the housing 15. As shown in FIGS. 1, 3, and 4, the openings P and Q create an upward air current in the air inside the housing 15 heated by the drive motor 9 due to the temperature difference between the air. This air current causes relatively low-temperature air from the outside to flow into the housing 15 through the opening P at the lower end of the side wall 2, as indicated by arrow u. The heated air inside the housing 15 is also released outside the housing 15 through the opening Q at the upper end of the side wall 2, as indicated by arrow v, due to the upward air current. The side wall 2 is composed of a panel 2a and a thermal insulator 2b, and the thermal insulator 2b, arranged on the inner surface, prevents heat from being transferred from inside the housing 15 to the outer panel 2a.

[0026] Some of the drive motors 9 of the shot mechanism 3 have their rotation axes J positioned in the vertical direction, and a cooling fan 4 is fixed to the lower end of the rotation axis J, with its casing 6 disposed close to the side wall 2. Therefore, the airflow for cooling the drive motors 9 by the cooling fan 4 promotes the flow of air from the opening P at the lower end inside the housing 15 to the opening Q at the upper end.

[0027] As described above, in this embodiment, the side wall 2 that constitutes a part of the inside of the housing 15 has a gap K with open upper and lower ends. Therefore, an airflow can be generated inside the housing 15 by the opening P at the lower end and the opening Q at the upper end of the side wall 2 that open to the outside. This airflow allows low-temperature air outside the housing 15 to be introduced through the opening P and heated air inside the housing 15 to be exhausted through the opening Q. Therefore, because the device is compact and the workpiece is small, the heat exhaust efficiency can be improved with a simple structure in a device that becomes hot due to the shot medium colliding with the housing.

[0028] The side wall 2 is composed of a panel 2a and a heat insulating material 2b, with the heat insulating material 2b being disposed facing the heat generating elements. This prevents the high heat inside the housing 15 from being transmitted to the panel 2a located outside the housing 15, thereby preventing workers from getting burned. Some of the drive motors 9 have their rotation axes J positioned vertically and a cooling fan fixed to their lower ends, and are disposed close to the side wall 2. This promotes the airflow from the cooling fan to flow from the opening P to the opening Q, further improving the heat dissipation effect.

[0029] Furthermore, in this embodiment, the air introduced into the housing 15 is released to the outside, bypassing the bucket elevator 14. The bucket elevator 14 includes many components that are sensitive to heat. This embodiment makes it possible to prevent a decrease in the durability of the bucket elevator 14 and also to release high-temperature air to the outside.

[0030] In the above embodiment, the side wall 2 having the heat insulating material 2b on its inner surface with a gap K provided from the heat generating element is disposed opposite the drive motor 9 of the housing 15 of the processing chamber, but this is not limited to this. For example, if a rotating brush or the like serves as a heat generating element within the blow-off chamber 17 and becomes hot, the side wall 2 having the gap K of the present invention may be provided in a position facing the heat generating element within the blow-off chamber 17. For other parts of the shot processing apparatus 1 as well, if a heat generating element is present, the present invention can be effectively utilized by providing a side wall 2 having a similar gap K.

[0031] In the above-described embodiment, an impeller is used as the shot mechanism 3, but this is not limited to this. For example, even in a shot processing device equipped with an injection mechanism that performs shot processing by injecting shot medium T together with compressed air toward the workpiece W, the configuration of the present invention in which a side wall 2 having a gap K with open upper and lower ends can have the effect of exhausting heat from air heated by a heat generating element to the outside.

[0032] In the above-described embodiment, a bucket elevator 14 is used as an example of a transport mechanism, but this is not limited to this. Any mechanism that can transport shot media T from below to above, such as a flight conveyor, may be adopted as appropriate depending on the implementation situation of the device. [Explanation of symbols]

[0033] 1 shot processing equipment 2 side wall Panel 2a 2b Insulation material 3, 3a, 3b Shot mechanism (impeller) (heat generating element) 4 cooling fans 6 Casing 9, 9a, 9b Drive motor (heat generating element) 12a, 12b, 12c Ventilators 14 Bucket elevator (transport mechanism) 15 Processing chamber (enclosure) J rotation axis K gap P, Q openings W: Workpiece (wire)

Claims

1. A shot processing device for performing shot processing on a wire rod, a housing defining a processing chamber; a side wall that constitutes a part of an outer wall of the housing, that is disposed so as to be positioned in the up-down direction along the housing, and that is disposed with a gap between it and the outer wall of the housing; Equipped with The gap is in communication with the outside, with the lower end side and the upper end side of the side wall each opening to the outside, air is introduced from the opening on the lower end side by an ascending air current generated in the gap due to heat generated in the processing chamber, and the air is discharged from the opening on the upper end side; The side wall includes a panel and a heat insulating material disposed on the gap side.

2. The shot processing device further includes a heating element that generates heat inside the housing when the shot processing device is driven. The shot processing apparatus according to claim 1 , wherein the heat insulating material is provided on a surface of the panel that faces the heat generating element.

3. a plurality of shot mechanisms, each of which has a drive motor for driving a shot-projecting impeller; The drive motors of some of the shot mechanisms among the plurality of shot mechanisms have their rotation axes positioned in a vertical direction, a cooling fan for cooling the drive motor is fixed to the lower end of the rotating shaft; a casing of the cooling fan is disposed adjacent to the side wall, 3. The shot processing apparatus according to claim 1, wherein the airflow generated by said cooling fan is discharged from an opening at the upper end of said side wall.

4. A heat exhaust method for a shot processing device that performs shot processing by projecting a shot medium onto a wire, comprising: The shot processing device includes: a housing defining a processing chamber; a side wall that constitutes a part of the outer wall of the housing, is arranged so as to be positioned in the up-down direction along the housing, and is arranged with a gap between it and the outer wall of the housing, the side wall including a panel and a heat insulating material arranged on the gap side; Equipped with The gap is in communication with the outside, with the lower end side and the upper end side of the side wall each opening to the outside, air is introduced from the opening on the lower end side by an ascending air current generated in the gap due to heat generated in the processing chamber, and the air is discharged from the opening on the upper end side; A heat dissipation method in which the heat insulating material prevents heat from inside the housing from being transferred to the panel.

5. The shot processing device further includes a transport mechanism that transports the projected shot medium from a lower portion of the housing to an upper portion thereof, and a ventilator provided in the housing; The heat dissipation method according to claim 4 , wherein the air introduced into the housing from the ventilator bypasses the transport mechanism and is discharged to the outside from an opening including an opening of the gap.

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