CN109070313B - Device and method for treating surface in hole - Google Patents
Device and method for treating surface in hole Download PDFInfo
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- CN109070313B CN109070313B CN201780022305.4A CN201780022305A CN109070313B CN 109070313 B CN109070313 B CN 109070313B CN 201780022305 A CN201780022305 A CN 201780022305A CN 109070313 B CN109070313 B CN 109070313B
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- hole
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- horizontal hole
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/04—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C5/00—Devices or accessories for generating abrasive blasts
- B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
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- Cleaning By Liquid Or Steam (AREA)
- Spray Control Apparatus (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The surface treatment device (10) in a hole comprises: a horizontal hole nozzle (14) which is formed in a bottomed cylindrical shape and ejects a projection material, which is sent into the cylinder together with air, to the outside from a projection hole formed in a part of the outer peripheral surface; a servo motor (16) which is provided with a drive shaft (42) and drives the drive shaft (42) to rotate in a reciprocating manner within a predetermined angle range; and a gear drive unit (18) having: a motor-side gear (44) that is attached to the drive shaft (42) of the servomotor (16) and that rotates together with the drive shaft (42) of the servomotor (16); and a nozzle-side gear (28) that is attached to the cross-hole nozzle (14), rotates together with the cross-hole nozzle (14), and transmits the motion of a drive shaft (42) of the servo motor (16) to the cross-hole nozzle (14) by directly or indirectly engaging the motor-side gear (44) with the nozzle-side gear (28) so that the cross-hole nozzle (14) is rotated in a reciprocating manner within a predetermined angular range about the cylindrical axis L thereof.
Description
Technical Field
The present disclosure relates to a device and a method for treating a surface in a hole.
Background
Patent document 1 discloses a core sand removing apparatus and a core sand removing method. In the core sand removing apparatus and the removing method, an inclined nozzle is inserted into a hollow portion (hole) formed in an object to be processed (hereinafter, referred to as a "workpiece"), and the workpiece is rotated while a projection material is projected from a jet port formed in the inclined nozzle. Thereby, the shot material is projected to the entire circumference of the inner surface of the hole of the workpiece, and shot blasting is performed on the inner surface of the hole of the workpiece.
Patent document 1: japanese laid-open patent publication No. 9-314469
However, in the structure disclosed in patent document 1, shot blasting cannot be performed only on a part of the inner surface of the hole of the workpiece, and even a shot projection material is projected in a range where shot blasting is not necessary. Therefore, the structure disclosed in patent document 1 has room for improvement from the viewpoint of improvement in the processing efficiency.
Disclosure of Invention
In the art, it is desired to obtain a device and a method for treating a surface in a hole, which can improve machining efficiency.
An in-hole surface treatment device of one aspect of the present disclosure has: at least one horizontal hole nozzle which is formed in a bottomed cylindrical shape and ejects the shots fed into the cylinder together with air from a shot hole formed in a part of an outer peripheral surface to the outside; at least one reciprocating rotation driving mechanism which is provided with a driving shaft and drives the driving shaft to perform reciprocating rotation in a specified angle range; and at least one gear drive section having: a motor-side gear attached to a drive shaft of the reciprocating rotation drive mechanism and rotating together with the drive shaft of the reciprocating rotation drive mechanism; and a nozzle-side gear that is attached to the cross-hole nozzle and rotates together with the cross-hole nozzle, and that causes the cross-hole nozzle to perform reciprocating rotation within a predetermined angular range around the cylindrical axis of the cross-hole nozzle by transmitting the motion of the drive shaft of the reciprocating rotation drive mechanism to the cross-hole nozzle through direct or indirect engagement of the motor-side gear with the nozzle-side gear.
In this device, the operation of the drive shaft of the reciprocating rotary drive mechanism is transmitted to the lateral hole nozzle via the gear drive unit. Since the reciprocating rotary drive mechanism performs reciprocating rotary drive within a predetermined angular range, the horizontal hole nozzle performs reciprocating rotary motion within a predetermined angular range around the cylindrical axis of the horizontal hole nozzle. In this case, the motor-side gear and the nozzle-side gear are directly or indirectly engaged with each other, so that the following performance of the horizontal hole nozzle with respect to the operation of the drive shaft of the reciprocating rotary drive mechanism is improved. Therefore, management of the angular range of the reciprocating rotational motion of the lateral hole nozzle becomes easy. When only one part of the inner surface of the hole of the workpiece is required to be shot-blast cleaned, the device can enable the transverse hole nozzle to rotate back and forth corresponding to the shot-blast cleaning target part in the inner surface of the hole of the workpiece, and project the projection material to the shot-blast cleaning target part.
In one embodiment, the reciprocating rotary drive mechanism may also be a servo motor. The servomotor can also adjust the angular range in which the drive shaft is driven in a reciprocating rotational manner.
In this device, the servomotor can adjust the angular range in reciprocating rotational driving of the drive shaft. Therefore, the angular range of the reciprocating rotation of the horizontal hole nozzle that is reciprocated by the operation of the drive shaft of the servomotor can be similarly adjusted. Therefore, the apparatus can easily change the range of projecting the shots even when workpieces having different shot blasting target ranges in the hole inner surface of the workpiece are machined. Therefore, the device can be used for various workpieces to improve the processing efficiency.
In one embodiment, at least one cross-hole nozzle may also have a plurality of cross-hole nozzles. The plurality of horizontal hole nozzles may be integrated with the apparatus casing.
According to this device, since the plurality of horizontal hole nozzles are unitized with the device case, the plurality of horizontal hole nozzles can be moved simultaneously by moving the device case. Therefore, even when the shot-blasting target range of the inner surface of the hole of the workpiece is wide, the apparatus can efficiently project the projection material to the workpiece by moving the apparatus case to move the plurality of horizontal hole nozzles to the inner surface of the hole of the workpiece and projecting the projection material from the plurality of horizontal hole nozzles. Therefore, the device can further improve the processing efficiency.
In one embodiment, the plurality of horizontal hole nozzles may be rotated reciprocally within a predetermined angular range around the cylindrical axis of each horizontal hole nozzle by one reciprocating rotation driving mechanism and one driving force transmission mechanism.
According to this device, since the plurality of horizontal hole nozzles are reciprocally rotated by the single reciprocal rotation driving mechanism and the drive transmission mechanism, the device can be formed into a simple structure. Thus, the apparatus can suppress the cost of the apparatus.
In one embodiment, the at least one reciprocating rotary drive can also have a plurality of reciprocating rotary drives. At least one gear drive may also have a plurality of gear drives. Further, the plurality of horizontal hole nozzles may be provided with a reciprocating rotation driving mechanism and a gear driving unit, respectively. Each of the horizontal hole nozzles may be reciprocally rotated within a predetermined angular range around the cylindrical shaft by the operation of the corresponding reciprocating rotation driving mechanism.
According to this apparatus, since the reciprocating rotation driving mechanism and the gear driving unit are provided in each of the plurality of horizontal hole nozzles, the angular range of the reciprocating rotation of each horizontal hole nozzle can be adjusted by changing the control of each reciprocating rotation driving mechanism. Therefore, the apparatus can perform projection of a finer shot material according to the workpiece. Thus, the apparatus can perform machining more appropriately according to the inner surface of the hole of the workpiece.
The method for treating the surface in the hole according to another aspect of the present disclosure is applied to a device for treating the surface in the hole, the device including: at least one horizontal hole nozzle which is formed in a bottomed cylindrical shape and ejects the shots fed into the cylinder together with air from a shot hole formed in a part of an outer peripheral surface to the outside; at least one reciprocating rotation driving mechanism which is provided with a driving shaft and drives the driving shaft to perform reciprocating rotation in a specified angle range; and at least one gear drive section having: a motor-side gear attached to a drive shaft of the reciprocating rotation drive mechanism and rotating together with the drive shaft of the reciprocating rotation drive mechanism; and a nozzle-side gear that is attached to the cross-hole nozzle, rotates together with the cross-hole nozzle, and causes the cross-hole nozzle to perform reciprocating rotation within a predetermined angular range around a cylindrical axis of the cross-hole nozzle by transmitting the motion of a drive shaft of a reciprocating rotation drive mechanism to the cross-hole nozzle through direct or indirect engagement of a motor-side gear with the nozzle-side gear, the method comprising: a first step of inserting a horizontal hole nozzle into a hole of an object to be processed; and a second step of projecting the shot material while rotating the lateral hole nozzle back and forth about the cylindrical axis of the lateral hole nozzle in correspondence with the shot-blast target area on the inner surface of the hole of the object to be processed.
In this method, in a first step, a horizontal hole nozzle is inserted into a workpiece, and in a second step, a shot material is projected while the horizontal hole nozzle is rotated back and forth about a cylindrical axis. Since the angular range in which the lateral hole nozzle is rotated back and forth corresponds to the shot-blasting target range of the inner surface of the hole of the workpiece, shot-blasting can be performed in a range in which the projection material is prevented from being projected to the other range. Thus, the method can improve the processing efficiency.
In one embodiment, the at least one cross-hole nozzle can also have a plurality of cross-hole nozzles, and the plurality of cross-hole nozzles is integrated into the device housing. In the first step, a plurality of horizontal hole nozzles may be simultaneously inserted into the holes of the object to be processed, and the projection material may be projected from the plurality of horizontal hole nozzles in the second step.
In this method, in a first step, a plurality of horizontal hole nozzles are inserted into a workpiece, and in a second step, a shot material is projected while the plurality of horizontal hole nozzles are rotated back and forth about a cylindrical axis. Therefore, even when the shot blast cleaning target range of the inner surface of the hole of the workpiece is wide, the projection material can be efficiently projected by projecting the projection material from the plurality of lateral hole nozzles. Thus, the method can further improve the processing efficiency.
In one embodiment, when the portions corresponding to the respective horizontal hole nozzles are not directly connected to each other or are directly connected to and separated from each other in the holes of the object into which the horizontal hole nozzles can be inserted, the horizontal hole nozzles may be inserted into the inner surfaces of the holes of the object, and the shots may be simultaneously projected from the horizontal hole nozzles. Further, when the positions corresponding to the respective horizontal hole nozzles are directly communicated with each other and are close to each other in the inside of the hole of the object to be processed into which the plurality of horizontal hole nozzles can be inserted, the projection material may be projected onto the inner surface of the hole of the object to be processed by the adjacent horizontal hole nozzles among the plurality of horizontal hole nozzles at different timings.
According to this method, when the portions corresponding to the plurality of cross-hole nozzles in the hole inner surface of the workpiece are not directly communicated with each other or are separated even if directly communicated with each other, the workpiece can be efficiently shot-blasted by simultaneously projecting shots from the plurality of cross-hole nozzles inserted into the hole inner surface of the workpiece. In addition, in this method, when the portions of the inner surface of the hole of the workpiece corresponding to the plurality of cross-hole nozzles are directly communicated with each other and are close to each other, the adjacent cross-hole nozzles among the plurality of cross-hole nozzles project the projection material onto the inner surface of the hole of the workpiece in different timing machines, respectively, so that the inner surface of the hole of the workpiece can be shot-blasted while suppressing interference between the projection materials projected from the plurality of cross-hole nozzles. Thus, the method can perform shot blasting appropriately according to the workpiece.
Here, "direct communication" means that a portion of the inner surface of the hole of the workpiece, which communicates with one portion and the other portion corresponding to the lateral hole nozzle, is formed substantially linearly.
In one embodiment, the mass ratio (a/B) of the mass a of the projection material projected from the projection hole of the cross-hole nozzle to the mass B of the air per unit time may be 0.3 or more and 0.9 or less.
According to this method, since the mass ratio of the mass a of the projection material projected from the projection port of the lateral hole nozzle to the mass B of the air is 0.3 or more and 0.9 or less, the projection material can be projected without being accumulated even at a narrow position between the inner surface of the hole of the workpiece and the lateral hole nozzle. Thus, the method can perform shot blasting even when a gap between the inner surface of the hole of the workpiece and the cross-hole nozzle is narrow.
According to the device and the method for treating the surface in the hole, the machining efficiency can be improved.
Drawings
Fig. 1 is a partial sectional view showing a main part of an in-hole surface treatment apparatus according to a first embodiment.
Fig. 2 is a schematic view showing an example of the reciprocating rotation operation of the horizontal hole nozzle of the device for treating the inner surface of a hole according to the first embodiment.
Fig. 3 is a diagram illustrating a workpiece.
Fig. 4 is a partial sectional view showing a main part of the in-hole surface treatment apparatus of the comparative example.
Fig. 5 is a partial sectional view showing a main part of a surface treatment apparatus in a hole according to a second embodiment.
Fig. 6 is a partial sectional view showing a main part of a surface treatment apparatus in a hole according to a third embodiment.
FIG. 7 is a table showing the results of the experiment.
Detailed Description
(first embodiment)
Hereinafter, a hole inner surface treatment apparatus and a hole inner surface treatment method according to a first embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is a partial sectional view showing a main part of an in-hole surface treatment apparatus according to a first embodiment.
As shown in fig. 1, the in-hole surface treatment apparatus 10 includes: a device case 12, a cross-hole nozzle 14, a servomotor 16 (an example of a reciprocating rotary drive mechanism), a gear drive unit 18, and an angle adjusting device 20. The apparatus case 12 constitutes a part of a not-shown body of the orifice surface treatment apparatus 10. A horizontal hole nozzle 14 is rotatably attached to the hollow device case 12 about the cylindrical axis L. A servomotor 16 is attached to the device case 12 at a position adjacent to the lateral hole nozzle 14.
The horizontal hole nozzle 14 is in the shape of a bottomed cylinder and is disposed to extend in the vertical direction of the apparatus. A not-shown injection hole is formed in a part of the outer peripheral surface of the lower end 24 of the horizontal hole nozzle 14. For example, the portion of the horizontal hole nozzle 14 from the lower end 24 to the substantially central portion in the longitudinal direction has an outer diameter of 8mm and an inner diameter of 5 mm. The projection hole is formed in a substantially circular shape so as to communicate the inside and the outside of the horizontal hole nozzle 14, when the plane of the projection hole is viewed straight. As an example, the inner diameter of the shot hole is 5 mm. The shots fed into the cylinder of the cross-hole nozzle 14 together with air are ejected from the shots to the outside of the cross-hole nozzle 14.
The upper end 26 of the horizontal hole nozzle 14 is inserted into the device case 12. A nozzle-side gear 28 constituting a part of the gear drive unit 18 is attached to a portion of the upper end 26 of the horizontal hole nozzle 14 corresponding to the inside of the device case 12. The nozzle-side gear 28 is formed in a disk shape, and has meshing teeth 30 formed on an outer peripheral surface thereof. The nozzle-side gear 28 is disposed so that the plate thickness direction is the device vertical direction. The nozzle-side gear 28 is provided so that the center of the drive shaft is located at the same position as the cylindrical axis L of the horizontal hole nozzle 14 extending in the vertical direction of the apparatus.
A holder 32 is provided on the device upper side of the cross-hole nozzle 14 in the device housing 12. The lower end 34 of the retainer 32 is mounted to an upper surface 36 of the device housing 12. One end of a hose 40 is attached to the upper end 38 of the holder 32. The other end of the hose 40 is connected to an air blast tank, not shown. The shots are fed into the holder 32 through the inside of the hose 40 together with the compressed air. Further, an opening, not shown, of the upper end portion 26 of the lateral-hole nozzle 14 is disposed inside the holder 32. Accordingly, the shots and the compressed air from the hose 40 are conveyed into the cylinder of the cross-hole nozzle 14.
The servomotor 16 is mounted to the upper surface 36 of the device housing 12. The drive shaft 42 of the servomotor 16 is inserted into the device housing 12. A motor-side gear 44 constituting a part of the gear drive unit 18 is attached to a drive shaft 42 of the servomotor 16. The motor-side gear 44 is formed in a disk shape, and has meshing teeth 46 formed on an outer peripheral surface thereof. The motor-side gear 44 is disposed so that the plate thickness direction is the device vertical direction. The motor-side gear 44 is disposed so that its center of rotation is located at the same position as the axis L2 of the drive shaft 42 of the servomotor 16, which extends in the device up-down direction. The gear drive unit 18 is configured such that the motor-side gear 44 directly meshes with the nozzle-side gear 28 provided in the horizontal hole nozzle 14. The gear driving unit 18 is configured such that the motor-side gear 44 and the nozzle-side gear 28 are directly meshed with each other, but is not limited to this, and may be configured such that another gear is provided between the motor-side gear 44 and the nozzle-side gear 28, and the motor-side gear 44 and the nozzle-side gear 28 are indirectly meshed with each other.
An angle adjusting device 20 is connected to the servomotor 16. As an example, the angle adjusting device 20 includes: a controller that inputs an angle range in which reciprocating rotation is performed; a servo amplifier that transmits an operation signal to the servo motor 16 based on an instruction from the controller; and an encoder for monitoring an operation state of the servo motor 16 (both not shown). The drive shaft 42 of the servomotor 16 is rotationally driven in a reciprocating manner within an angular range input by the controller of the angle adjusting device 20.
The operation of the drive shaft 42 of the servomotor 16 is transmitted to the horizontal hole nozzle 14 via the gear drive unit 18. Since the servomotor 16 is driven to rotate reciprocally within a predetermined angular range, the horizontal hole nozzle 14 performs reciprocating rotational motion within a predetermined angular range around the cylindrical axis L of the horizontal hole nozzle 14. Fig. 2 is a schematic diagram showing an example of the reciprocating rotation operation of the horizontal hole nozzle 14 of the device for treating the inner surface of a hole 10 according to the first embodiment. The cross-hole nozzle 14 performs reciprocating rotational motion within an angular range indicated by an arrow in the drawing.
Next, a method of surface treatment in the hole applied to the above-described device 10 for surface treatment in the hole will be described. Fig. 3 is a diagram illustrating a workpiece. Fig. 3 (a) is a plan view of the workpiece, and fig. 3 (B) is a transverse sectional view showing the inside of the workpiece shown in fig. 3 (a). As shown in fig. 3 (a) and 3 (B), the workpiece 50 is an object to be processed and has a substantially rectangular cubic shape in a plan view. The workpiece 50 has an internal path 52 (an example of a hole of an object to be processed) formed therein. Further, a plurality of (4 in the present embodiment) insertion ports 54 communicating with the internal path 52 are formed in the upper surface 51 of the workpiece 50. In addition, the respective portions of the internal path 52 corresponding to the insertion port 54 are not directly connected to each other.
The outer peripheral surface of the workpiece 50 including the upper surface 51 is shot-blasted by another shot blasting device in advance. At this time, since the shots enter the inner path 52 from the insertion port 54, the portion a of the inner path 52 closer to the insertion port 54 is shot-cleaned. However, the other positions in the internal path 52 are not shot-cleaned because the shots are not projected thereto.
To perform the in-hole surface treatment, first, the horizontal hole nozzle 14 of the hole inner surface treatment apparatus 10 is inserted into one of the insertion ports 54 of the workpiece 50 (an example of the first step). Then, the lateral hole nozzle 14 is rotated back and forth about the cylindrical axis L (see an arrow in fig. 2 and 3B) in accordance with the shot blast target range in the workpiece 50, and the shots are projected (an example of the second step). The shot-blasting target range is a range set in advance as an object of shot-blasting. In the present embodiment, the shot blast target range is a range of the internal path 52 other than the portion a where shot blast is not performed.
The shots projected from the cross hole nozzle 14 in the "second process" are projected from the cross hole nozzle 14 together with the compressed air. When the mass of the shots to be projected per unit time is a and the mass of the compressed air at that time is B, the mass ratio a/B of the shots to the compressed air per unit time may be 0.3 or more. When the mass ratio a/B is less than 0.3, since the projected shots are small per unit time, there is a fear that the shot blast cleaning capability cannot be sufficiently exerted. The mass ratio A/B may be 0.9 or less. When the mass ratio a/B is greater than 0.9, since the shots stay in the holes of the workpiece 50 and interfere with each other, there is a fear that the shot blast cleaning capability cannot be sufficiently exerted. That is, the mass ratio a/B may be set to 0.3 or more and 0.9 or less. In addition, in the general shot-blasting device, the mass ratio A/B is set to be 1.4-3.3. That is, the method for treating the surface of the inside of the hole according to the present embodiment sets the mass ratio a/B of the shots to be lower than that of the shot blasting method using a general shot blasting machine.
By performing the above processing in the same manner also in the other insertion ports 54, the shots are projected also in the range other than the portion a in the internal path 52, and therefore shot blasting can be performed over a wide range in the internal path 52.
(action and Effect of the first embodiment)
Next, the operation and effect of the present embodiment will be described. Here, the operation and effect of the present embodiment will be described using a comparative example shown in fig. 4. Fig. 4 is a partial sectional view showing a main part of the in-hole surface treatment apparatus of the comparative example. Note that the same reference numerals are given to the same components as those in the present embodiment in the comparative example, and the description thereof is omitted.
As shown in fig. 4, a tape drive unit 100 is provided inside the device case 12. The belt driving unit 100 includes a motor-side pulley 102 attached to the drive shaft 42 of the servomotor 16 and a nozzle-side pulley 104 attached to the horizontal hole nozzle 14, and a belt 106 is stretched over the motor-side pulley 102 and the nozzle-side pulley 104. The operation of the drive shaft 42 of the servomotor 16 is transmitted to the lateral hole nozzle 14 via the belt drive unit 100. Further, since the servomotor 16 in the comparative example is set to rotate in one direction, the cross-hole nozzle 14 rotates in one direction, and the shots are projected to the entire circumference of the inner surface of the hole of the workpiece.
In the case of the structure of the comparative example, since the shots were projected to the entire circumference of the inner surface of the hole of the workpiece, when it was intended to perform shot blasting only on a part of the inner surface of the hole of the workpiece, the shots were projected even to the extent that shot blasting was not necessary. Therefore, it is considered that the servomotor 16 is rotationally driven reciprocally in an angle range corresponding to the shot blasting target range of the hole inner surface of the workpiece. However, at this time, a slip may occur between the belt 106 and the motor-side pulley 102 and the nozzle-side pulley 104. Further, the operation of the drive shaft 42 of the servo motor 16 may not be sufficiently transmitted to the horizontal hole nozzle 14 due to the tension of the belt 106. Therefore, the angular range of the reciprocating rotation of the drive shaft 42 of the servo motor 16, which is set corresponding to the shot-blasting target range of the workpiece, may be different from the angular range of the reciprocating rotation of the lateral hole nozzle 14 without the lateral hole nozzle 14 following the operation of the drive shaft 42 of the servo motor 16. That is, there is a possibility that the shot-blasting target area of the workpiece may not be sufficiently projected with the shot-blasting material, and the shot-blasting material may be projected to a portion where the shot-blasting is not necessary, and there is room for improvement from the viewpoint of improvement in the machining efficiency.
In contrast, in the present embodiment, as shown in fig. 1, the operation of the drive shaft 42 of the servomotor 16 is transmitted to the horizontal hole nozzle 14 via the gear drive unit 18. Since the servomotor 16 is driven to rotate reciprocally within a predetermined angular range, the lateral hole nozzle 14 reciprocates within the predetermined angular range around the cylindrical axis L of the lateral hole nozzle 14. At this time, the motor-side gear 44 and the nozzle-side gear 28 are directly or indirectly meshed with each other, so that the following performance of the horizontal hole nozzle 14 with respect to the operation of the drive shaft 42 of the servomotor 16 is improved. Therefore, management of the angular range of the reciprocating motion of the lateral hole nozzle 14 becomes easy. The in-hole surface treatment apparatus 10 is capable of projecting the projection material to the shot blasting target range by reciprocating rotation of the cross-hole nozzle 14 corresponding to the shot blasting target range in the in-hole surface of the workpiece 50 when only a part of the inner surface of the inner path 52 of the workpiece is to be shot blasted. This enables the surface treatment apparatus 10 to improve the processing efficiency.
Further, the angular range in which the drive shaft 42 of the servomotor 16 is driven to rotate back and forth can be adjusted by the angle adjusting device 20. Therefore, the angular range of the reciprocating rotation of the horizontal hole nozzle 14 that is reciprocated by the operation of the drive shaft 42 of the servomotor 16 can be similarly adjusted. Therefore, even when workpieces having different shot blasting target ranges are machined in the hole inner surfaces of the workpieces, the hole inner surface treatment device 10 can easily change the range in which the shots are projected by the angle adjustment device 20. Thus, the surface treatment apparatus 10 in a hole can improve the machining efficiency for various workpieces.
In the first step, the horizontal hole nozzle 14 is inserted into the inner path 52 of the workpiece 50, and in the second step, the horizontal hole nozzle 14 is rotated back and forth about the cylindrical axis L to project the shots. Since the angular range of the reciprocating rotation of the lateral hole nozzle 14 corresponds to the shot-blasting target range (except for the portion a) in the inner surface of the internal path 52 of the workpiece 50, shot-blasting can be performed while suppressing projection of the projection material to the other range (portion a). This enables the surface treatment apparatus 10 to improve the processing efficiency. In addition, the in-hole surface treatment apparatus 10 can suppress damage to the portion a of the internal path 52 due to projection of more than necessary projection material to the portion a.
Further, since the mass ratio of the mass a of the projection material projected from the projection port of the lateral hole nozzle 14 to the mass B of the air is set to satisfy the relationship of 0.3 or more and 0.9 or less, the projection material can be projected without being accumulated even at a narrow position between the inner surface of the inner path 52 of the workpiece 50 and the lateral hole nozzle 14. Thus, the in-hole surface treatment apparatus 10 can perform shot blasting even when the distance between the inner surface of the inner path 52 of the workpiece 50 and the lateral hole nozzle 14 is narrow.
The above effects are shown in the experimental results described below. In this experiment, the state of shot peening when a shot material having a diameter of 0.3 of a steel shot is projected at a different mass ratio from the horizontal hole nozzle 14 shown in FIG. 1 onto the inner surface of the hole of a workpiece having a diameter of 12mm was examined. Further, the projection pressure of the projection material was 0.5MPa, and the projection time was 16 seconds.
The results of the experiment are shown in FIG. 7. FIG. 7 is a table showing the results of the experiment. As shown in fig. 7, when shot blasting was performed at the mixing ratios (mass ratios) of 0.3 and 0.9, the workpiece was successfully ground, and when shot blasting was performed at the mixing ratios of 1.3 and 1.8, the workpiece was not sufficiently ground. In addition, when the mass ratio is high (the projection material is increased), the projection material is likely to be accumulated between the lateral hole nozzle 14 and the inner surface of the hole of the workpiece, and therefore the accumulated projection material is likely to interfere with the projected projection material, and it is difficult to perform shot blasting on the workpiece by shot blasting.
(second embodiment)
Next, a hole inner surface treatment apparatus and a hole inner surface treatment method according to a second embodiment of the present disclosure will be described with reference to fig. 5. Fig. 5 is a partial sectional view showing a main part of a surface treatment apparatus in a hole according to a second embodiment. Note that the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
As shown in fig. 5, the in-hole surface treatment apparatus 56 of the second embodiment is different from the in-hole surface treatment apparatus 10 of the first embodiment in that a plurality of horizontal hole nozzles 14 are provided and unitized, and in that one servomotor 16 and the driving force transmission mechanism 60 are operated separately, and the other points are the same.
That is, a plurality of horizontal hole nozzles 14 (4 in the present embodiment) are provided adjacent to each other in the apparatus case 58. The distance between the plurality of horizontal hole nozzles 14 is set to be substantially the same as the distance between the plurality of insertion holes 54 of the workpiece 50 shown in fig. 3 (a). Further, a driving force transmission mechanism 60 is provided inside the device case 58. The driving force transmission mechanism 60 includes a plurality of worm gears 64 (an example of a motor-side gear) provided on a drive shaft 62 of the servomotor 16 and a nozzle-side gear 28 provided on the horizontal hole nozzle 14.
The drive shaft 62 of the servomotor 16 extends in the direction orthogonal to the vertical direction of the apparatus and in the vicinity of the plurality of nozzle-side gears 28. The worm gears 64 provided on the drive shaft 62 are disposed at positions of the drive shaft 62 corresponding to the nozzle-side gear 28, respectively. Each worm gear 64 is set to mesh with the corresponding nozzle-side gear 28. The servomotor 16 is held by a bracket, not shown, in the device case 58. The drive shaft 62 of the servomotor 16 is supported by a bearing shaft, not shown, provided inside the device case 58. The driving force transmission mechanism 60 is configured such that the worm wheel 64 directly engages with the nozzle-side gear 28, but is not limited to this, and may be configured such that another gear is provided between the worm wheel 64 and the nozzle-side gear 28, and the worm wheel 64 indirectly engages with the nozzle-side gear 28.
Next, a method of surface treatment in the hole applied to the above-described in-hole surface treatment device 56 will be described. To actually perform the in-hole surface treatment, first, the apparatus housing 58 is moved, and the plurality of horizontal hole nozzles 14 of the in-hole surface treatment apparatus 56 are simultaneously inserted into the plurality of insertion ports 54 of the workpiece 50 shown in fig. 3 a and 3B (an example of the first step). Then, in accordance with the shot-blasting target range in the workpiece 50 (i.e., the range in which the shot-blasting is not performed except for the portion a of the internal path 52), the lateral hole nozzles 14 are caused to project the projection material while being reciprocated and rotated about the cylindrical axis L (see the arrow in fig. 3B) by the power transmitted from the servomotor 16 by the driving force transmission mechanism 60 (an example of the second step).
The mass ratio a/B per unit time of the projection material projected from the horizontal hole nozzle 14 in the "second step" to the compressed air is set to be 0.3 to 0.9, as in the first embodiment.
(action and Effect of the second embodiment)
Next, the operation and effect of the present embodiment will be described. With the above configuration, the same effects as those of the first embodiment can be obtained, since the configuration is the same as that of the in-hole surface treatment apparatus 10 of the first embodiment, except that a plurality of horizontal hole nozzles 14 are provided and each of the horizontal hole nozzles is operated by one servo motor 16. That is, the following performance of the operation of the horizontal hole nozzle 14 and the drive shaft 62 of the servomotor 16 is improved. Therefore, management of the angular range of the reciprocating motion of the lateral hole nozzle 14 becomes easy. The hole inner surface treatment device 56 can project the projection material by reciprocating and rotating the lateral hole nozzle 14 in correspondence with only a part of the inner surface of the inner path 52 of the workpiece 50. This enables the surface treatment device 56 to improve the processing efficiency.
Further, since the plurality of horizontal hole nozzles 14 are provided and unitized with the apparatus case 58, the in-hole surface treatment apparatus 56 can move the plurality of horizontal hole nozzles 14 simultaneously by moving the apparatus case 58. Therefore, even when the shot blast target range in the hole inner surface of the workpiece 50 is wide, the in-hole surface treatment device 56 can move the device case 58 to move the plurality of lateral hole nozzles 14 toward the hole inner surface of the workpiece 50 and project the projection material from the plurality of lateral hole nozzles 14. Therefore, the in-hole surface treatment device 56 can efficiently project the shots onto the workpiece 50. This enables the surface treatment device 56 in the hole to further improve the processing efficiency.
Further, since the plurality of horizontal hole nozzles 14 are reciprocated and rotated by the single servomotor 16 and the driving force transmission mechanism 60, the in-hole surface treatment device 56 can be formed in a simple structure. This enables the in-hole surface treatment device 56 to reduce the cost of the device.
In the first step, the plurality of horizontal hole nozzles 14 are inserted into the workpiece 50, and in the second step, the shots are projected while the plurality of horizontal hole nozzles 14 are rotated back and forth about the cylindrical axis L. Therefore, even when the shot blast target range in the inner surface of the internal path 52 of the workpiece 50 is wide, the in-hole surface treatment device 56 can efficiently project the projection material by projecting the projection material from the plurality of lateral-hole nozzles 14. This enables the surface treatment device 56 in the hole to further improve the processing efficiency.
Further, by setting the mass a of the projection material projected from the projection port of the lateral hole nozzle 14 and the mass B of the air to a mass ratio (a/B) satisfying a relationship of 0.3 or more and 0.9 or less, the in-hole surface treatment device 56 can project the projection material without retaining the projection material even at a narrow position between the inner surface of the internal path 52 of the workpiece 50 and the lateral hole nozzle 14. Thus, the in-hole surface treatment device 56 can perform shot blasting even when the distance between the inner surface of the internal path 52 of the workpiece 50 and the lateral hole nozzle 14 is narrow.
In the present embodiment, 4 horizontal hole nozzles 14 are provided, but the present invention is not limited to this, and the number of horizontal hole nozzles 14 may be increased or decreased depending on the workpiece.
(third embodiment)
Next, a hole inner surface treatment apparatus and a hole inner surface treatment method according to a third embodiment of the present disclosure will be described with reference to fig. 6. Fig. 6 is a partial sectional view showing a main part of a surface treatment apparatus in a hole according to a third embodiment. Note that the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
As shown in fig. 6, the in-hole surface treatment apparatus 66 of the third embodiment is different from the in-hole surface treatment apparatus 10 of the first embodiment in that a plurality of horizontal hole nozzles 14 are provided and unitized, and in that the servo motor 16 and the gear drive unit 18 provided separately are operated, respectively, and the other points are the same.
That is, a plurality of horizontal hole nozzles 14 and servomotors 16 (4 in the present embodiment) are provided adjacent to each other in the apparatus case 68. The distance between the plurality of horizontal hole nozzles 14 is set to be substantially the same as the distance between the plurality of insertion holes 54 of the workpiece 50 shown in fig. 3 (a). Further, a gear drive unit 18 corresponding to each of the horizontal hole nozzle 14 and the servomotor 16 is provided inside the device case 68.
Next, a hole inner surface treatment method applied to the above-described hole inner surface treatment device 66 will be described. To perform the in-hole surface treatment, first, the apparatus housing 68 is moved to simultaneously insert the plurality of horizontal hole nozzles 14 of the in-hole surface treatment apparatus 66 into the plurality of insertion ports 54 of the workpiece 50 shown in fig. 3 a and 3B (an example of the first step). Then, in accordance with the shot-blasting target range in the workpiece 50 (i.e., the range in which the shot-blasting is not performed except for the portion a of the internal path 52), the lateral hole nozzles 14 are caused to project the projection material while being rotated back and forth about the cylinder axis L (see the arrow in fig. 3B) by the power from the servo motors 16 transmitted via the gear driving units 18 (an example of the second step).
The mass ratio a/B per unit time of the projection material projected from the horizontal hole nozzle 14 in the "second step" to the compressed air is set to be 0.3 to 0.9, as in the first embodiment.
(action and Effect of the third embodiment)
Next, the operation and effect of the present embodiment will be described. With the above configuration, the same effects as those of the first embodiment can be obtained, since the configuration is the same as that of the in-hole surface treatment apparatus of the first embodiment except that a plurality of horizontal hole nozzles 14 are provided and each is operated by the servo motor 16 provided separately. That is, the following performance between the horizontal hole nozzle 14 and the drive shaft 42 of the servomotor 16 is improved. Therefore, the bore inner surface treatment device 66 facilitates management of the angular range of the reciprocating motion of the lateral bore nozzle 14. The hole inner surface treatment device 66 can project the shots by reciprocating and rotating the cross-hole nozzle 14 in correspondence with only a part of the inner surface of the inner path 52 of the workpiece 50. This enables the surface treatment device 66 in the hole to improve the machining efficiency.
Further, since the plurality of horizontal hole nozzles 14 are provided and unitized with the apparatus case 68, the in-hole surface treatment apparatus 66 can move the plurality of horizontal hole nozzles 14 simultaneously by moving the apparatus case 68. Therefore, even when the shot blast target range in the hole inner surface of the workpiece 50 is wide, the in-hole surface treatment device 66 can move the device case 68 to move the plurality of lateral hole nozzles 14 toward the hole inner surface of the workpiece 50 and project the projection material from the plurality of lateral hole nozzles 14. Therefore, the in-hole surface treatment device 66 can efficiently project the shots onto the workpiece 50. This enables the surface treatment device 66 in the hole to further improve the processing efficiency.
Further, since the servo motors 16 and the gear drive units 18 are provided in the plurality of horizontal hole nozzles 14, the in-hole surface treatment device 66 can adjust the angular ranges of the reciprocating rotation of the horizontal hole nozzles 14 by changing the control of the servo motors 16. Therefore, the in-hole surface treatment device 66 can perform projection of a finer shot material according to the workpiece 50. Thereby, the in-hole surface treatment device 66 can perform machining more appropriately in accordance with the inner surface of the inner path 52 of the workpiece 50.
The in-hole surface treatment device 66 sets the mass ratio (a/B) of the mass a of the projection material projected from the projection port of the lateral hole nozzle 14 to the mass B of the air to satisfy the relationship of 0.3 to 0.9. Thus, the in-hole surface treatment device 66 can project the shots without leaving the shots even at a narrow position between the inner surface of the inner path 52 of the workpiece 50 and the lateral hole nozzle 14. Therefore, the in-hole surface treatment device 66 can perform shot blasting even when the gap between the inner surface of the internal path 52 of the workpiece 50 and the lateral hole nozzle 14 is narrow.
(second embodiment, modification of third embodiment)
In the second and third embodiments, the plurality of horizontal hole nozzles 14 are simultaneously inserted into the plurality of insertion ports 54 provided in the workpiece 50 shown in fig. 3, and the shots are projected. That is, as shown in fig. 3 a and 3B, when the portions (insertion ports 54) of the internal path 52 of the workpiece 50 corresponding to the plurality of cross-hole nozzles 14 are not directly connected to each other or are separated from each other even if they are directly connected to each other (50 mm or more as an example), the internal path 52 of the workpiece 50 can be efficiently shot-blasted by simultaneously projecting shots from the plurality of cross-hole nozzles 14.
On the other hand, when the portions (insertion ports 54) of the internal path 52 of the workpiece 50 corresponding to the plurality of horizontal hole nozzles 14 directly communicate with each other and are close to each other (50 mm or less as an example), for example, a mechanism or the like for operating the plurality of horizontal hole nozzles 14 individually in the vertical direction of the apparatus is provided, and the adjacent horizontal hole nozzles 14 are inserted into the insertion ports 54 in different timing machines to project the projection material. In addition to the above configuration, the projection material may be projected by simultaneously inserting the plurality of horizontal hole nozzles 14 into the plurality of insertion holes 54 while skipping one insertion hole 54 at a time, and then simultaneously inserting the plurality of horizontal hole nozzles 14 into the insertion hole 54 that has been skipped before, and projecting the projection material into the adjacent horizontal hole nozzles 14 in different machines. Further, the plurality of horizontal hole nozzles 14 may be simultaneously inserted into the insertion port 54, and the shots may be projected at different timings. This can prevent the shots projected from the plurality of lateral-hole nozzles 14 from interfering with each other, and can perform shot blasting on the inside of the workpiece 50.
In the first to third embodiments, the servo motor 16 is provided as the reciprocating rotation driving mechanism, but the present invention is not limited to this, and a link mechanism may be provided in the motor to reciprocally rotate the horizontal hole nozzle 14 within a predetermined angular range. Further, the angular range of the reciprocating rotation of the horizontal hole nozzle 14 can be adjusted by adjusting the positions of the joints of the link mechanism and the like.
While the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above, and it is needless to say that various modifications other than the above can be made without departing from the scope of the present disclosure.
Description of the reference numerals
10 … pore inner surface treatment device; 14 … cross-hole nozzle; 16 … servomotor; 18 … gear drive; 28 … nozzle-side gear; 42 … drive shaft; 44 … motor side gear; 50 … workpiece (object to be processed); 52 … internal path (hole of object to be processed); 64 … worm gears (motor side gears); l … cylindrical axis.
Claims (6)
1. An apparatus for treating an inner surface of a hole, comprising:
a plurality of horizontal hole nozzles which are respectively formed into a bottomed cylindrical shape and eject the shots fed into the cylinder together with air from the shots formed in a part of the outer peripheral surface to the outside;
a reciprocating rotation driving mechanism which is provided with a driving shaft and drives the driving shaft to perform reciprocating rotation in a specified angle range;
a gear drive unit having: a motor-side gear that is attached to a drive shaft of the reciprocating rotary drive mechanism and rotates together with the drive shaft of the reciprocating rotary drive mechanism; and a nozzle-side gear that is attached to the cross-hole nozzle and rotates together with the cross-hole nozzle, and that causes the cross-hole nozzle to perform reciprocating rotation within a predetermined angular range around a cylindrical axis of the cross-hole nozzle by transmitting the motion of the drive shaft of the reciprocating rotation drive mechanism to the cross-hole nozzle through direct or indirect engagement of the motor-side gear with the nozzle-side gear; and
a mechanism for operating the plurality of horizontal hole nozzles independently in the vertical direction of the apparatus,
the lateral hole nozzles inserted into the holes of the object to be processed project the projection material toward the shot-blasting target range while rotating reciprocally around the cylindrical axis in correspondence with the shot-blasting target range on the inner surface of the holes of the object to be processed,
wherein the plurality of horizontal hole nozzles simultaneously project the projection material when portions corresponding to the horizontal hole nozzles are not directly connected to each other or the portions are directly connected to each other and separated from each other in the holes of the object to be processed into which the plurality of horizontal hole nozzles can be inserted,
when the positions corresponding to the respective horizontal hole nozzles are directly communicated with each other and are close to each other in the holes of the object to be processed into which the horizontal hole nozzles can be inserted, the adjacent horizontal hole nozzles of the horizontal hole nozzles are inserted into the inner surfaces of the holes of the object to be processed at different timings, respectively, and the projection material is projected.
2. The downhole surface treatment apparatus of claim 1,
the reciprocating rotation driving mechanism is a servomotor capable of adjusting an angular range in which the drive shaft is driven in a reciprocating rotation manner.
3. The downhole surface treatment apparatus of claim 2,
the plurality of horizontal hole nozzles are rotated reciprocally within a predetermined angular range around the cylindrical axis of each horizontal hole nozzle by one of the reciprocating rotation driving mechanism and the driving force transmission mechanism.
4. The downhole surface treatment apparatus of claim 2,
a plurality of said reciprocating rotary drive mechanisms are provided,
a plurality of the gear driving parts are arranged,
the reciprocating rotation driving mechanism and the gear driving portion are provided in each of the plurality of horizontal hole nozzles, and each of the horizontal hole nozzles is configured to perform reciprocating rotation within a predetermined angular range around a cylindrical axis by an operation of the corresponding reciprocating rotation driving mechanism.
5. A method for treating the inner surface of a hole, which is applied to a device for treating the inner surface of the hole,
the surface treatment device in the hole comprises:
a plurality of horizontal hole nozzles which are respectively formed into a bottomed cylindrical shape and eject the shots fed into the cylinder together with air from the shots formed in a part of the outer peripheral surface to the outside;
a reciprocating rotation driving mechanism which is provided with a driving shaft and drives the driving shaft to perform reciprocating rotation in a specified angle range;
a gear drive unit having: a motor-side gear that is attached to a drive shaft of the reciprocating rotary drive mechanism and rotates together with the drive shaft of the reciprocating rotary drive mechanism; and a nozzle-side gear that is attached to the cross-hole nozzle and rotates together with the cross-hole nozzle, and that causes the cross-hole nozzle to perform reciprocating rotation within a predetermined angular range around a cylindrical axis of the cross-hole nozzle by transmitting the motion of the drive shaft of the reciprocating rotation drive mechanism to the cross-hole nozzle through direct or indirect engagement of the motor-side gear with the nozzle-side gear; and
a mechanism for operating the plurality of horizontal hole nozzles independently in the vertical direction of the apparatus,
the method for treating the surface in the hole comprises the following steps:
a first step of inserting the horizontal hole nozzle into a hole of an object to be processed; and
a second step of projecting the projection material while reciprocating and rotating the horizontal hole nozzle around a cylindrical axis of the horizontal hole nozzle in correspondence with a shot-blast target range on an inner surface of the hole of the object to be processed,
in the first step, the plurality of horizontal hole nozzles are simultaneously inserted into the holes of the object to be processed, and in the second step, the projection material is projected from the plurality of horizontal hole nozzles,
inserting the plurality of horizontal hole nozzles into the hole of the object to be processed into which the plurality of horizontal hole nozzles are insertable, when the portions corresponding to the respective horizontal hole nozzles do not directly communicate with each other or the portions directly communicate with each other and are separated from each other, and simultaneously projecting the projection material from the plurality of horizontal hole nozzles,
when the positions corresponding to the respective horizontal hole nozzles are directly communicated with each other and are close to each other in the holes of the object to be processed into which the horizontal hole nozzles can be inserted, the adjacent horizontal hole nozzles of the horizontal hole nozzles are inserted into the inner surfaces of the holes of the object to be processed at different timings, respectively, and the projection material is projected.
6. A method for treating a surface in a well according to claim 5,
the mass ratio A/B of the mass A of the projection material projected from the projection hole of the cross-hole nozzle to the mass B of the air per unit time is 0.3 or more and 0.9 or less.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016-112974 | 2016-06-06 | ||
| JP2016112974 | 2016-06-06 | ||
| PCT/JP2017/009242 WO2017212721A1 (en) | 2016-06-06 | 2017-03-08 | Hole inner surface processing device and hole inner surface processing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109070313A CN109070313A (en) | 2018-12-21 |
| CN109070313B true CN109070313B (en) | 2021-07-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780022305.4A Active CN109070313B (en) | 2016-06-06 | 2017-03-08 | Device and method for treating surface in hole |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JP6624286B2 (en) |
| KR (1) | KR20190015191A (en) |
| CN (1) | CN109070313B (en) |
| BR (1) | BR112018017176A2 (en) |
| TW (1) | TW201742708A (en) |
| WO (1) | WO2017212721A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111318969A (en) * | 2020-04-22 | 2020-06-23 | 东莞吉川机械科技股份有限公司 | Automatic sand blasting equipment of spray gun rotation type |
| TWI753768B (en) * | 2021-02-03 | 2022-01-21 | 甲富工業機械廠股份有限公司 | Inner hole injection rinsing machine |
| CN117161987B (en) * | 2023-11-03 | 2024-02-27 | 泰州市百冠泵阀科技有限公司 | Pump case surface polishing tool |
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| JPS5932262B2 (en) * | 1981-02-24 | 1984-08-07 | 株式会社神戸製鋼所 | Method and device for shot peening of curved pipes |
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| US20030032369A1 (en) * | 2001-08-10 | 2003-02-13 | Carpenter Steven J. | Apparatus and process for surface treating interior of workpiece |
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2017
- 2017-03-08 WO PCT/JP2017/009242 patent/WO2017212721A1/en active Application Filing
- 2017-03-08 BR BR112018017176A patent/BR112018017176A2/en not_active Application Discontinuation
- 2017-03-08 CN CN201780022305.4A patent/CN109070313B/en active Active
- 2017-03-08 JP JP2018522329A patent/JP6624286B2/en active Active
- 2017-03-08 KR KR1020187029053A patent/KR20190015191A/en unknown
- 2017-03-31 TW TW106110958A patent/TW201742708A/en unknown
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0398764A (en) * | 1989-09-06 | 1991-04-24 | Sinto Brator Co Ltd | Air blast device |
| JPH06254765A (en) * | 1993-01-11 | 1994-09-13 | Nissan Motor Co Ltd | Shot peening device for gear |
| CN1237499A (en) * | 1998-05-08 | 1999-12-08 | 铃木株式会社 | Method for blasting inside surface of cylinder |
| JP2004106092A (en) * | 2002-09-17 | 2004-04-08 | Sinto Brator Co Ltd | Air blast device and air blasting method |
| CN201799935U (en) * | 2010-08-04 | 2011-04-20 | 霍山县忠福铸造有限责任公司 | Spray gun for small hole ball blast |
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| CN202592227U (en) * | 2012-04-18 | 2012-12-12 | 重庆明治百通机械制造有限公司 | Rotating sprayer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2017212721A1 (en) | 2019-04-04 |
| CN109070313A (en) | 2018-12-21 |
| TW201742708A (en) | 2017-12-16 |
| BR112018017176A2 (en) | 2019-01-02 |
| JP6624286B2 (en) | 2019-12-25 |
| KR20190015191A (en) | 2019-02-13 |
| WO2017212721A1 (en) | 2017-12-14 |
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