阅读说明：本技术 喷射处理装置和喷射处理装置的控制方法 (Jet processing apparatus and control method of jet processing apparatus ) 是由 铃木伦生 于 2020-03-27 设计创作，主要内容包括：提供了喷射处理装置和喷射处理装置的控制方法,该喷射处理装置包括耐久性较高的阀装置。包括：储存喷射材料(9)的加料斗(2)；与所述加料斗(2)的下部连通并且内部被加压的加压箱(4)；以及配置于所述加料斗(2)与所述加压箱(4)的连通部(4a),并且包括阀芯(41)和阀座(28a)的阀装置(3),所述阀芯(41)按压所述阀座(28a)的按压力设定得比所述加压箱(4)内的压力低。(Provided are an injection processing device including a valve device having high durability, and a control method for the injection processing device. The method comprises the following steps: a hopper (2) for storing the injection material (9); a pressurizing tank (4) communicating with a lower portion of the hopper (2) and internally pressurized; and a valve device (3) which is disposed in a communication portion (4a) between the hopper (2) and the pressure tank (4) and which includes a valve body (41) and a valve seat (28a), wherein a pressing force with which the valve body (41) presses the valve seat (28a) is set to be lower than a pressure in the pressure tank (4).)

1. A spray processing device mixes a spray material with a high-pressure air flow and sprays the mixture from a nozzle toward a workpiece,

the spray processing apparatus is characterized by comprising:

a hopper storing a spray material;

a pressurizing tank communicating with a lower portion of the hopper and internally pressurized; and

a valve device disposed in a communicating portion between the hopper and the pressure tank, and including a valve element and a valve seat,

the pressing force of the valve element pressing the valve seat is set to be lower than the pressure in the pressure tank.

2. The spray treatment device of claim 1,

the valve seat includes a protrusion protruding downward.

3. The spray treatment device of claim 2,

the protrusions are protruding strips.

4. A spray treatment device according to claim 3,

the surface of the valve element abutting the valve seat is a flat surface.

5. The spray treatment device of claim 3 or 4,

the protrusion is substantially circular in shape so as to surround the opening of the valve seat.

6. The spray treatment device according to any one of claims 3 to 5,

the bead is formed by an elastomeric O-ring.

7. The spray treatment device of any one of claims 4 to 6,

the valve device further includes a valve element driving mechanism that moves the valve element to a position abutting against the valve seat or a position away from the valve seat, and drives the flat surface to face substantially downward when the valve element is moved away from the valve seat.

8. The spray treatment device of claim 7,

when the valve body is separated from the valve seat, the valve body driving mechanism drives the valve body so that the valve body is retracted to the outside of the virtual flow region of the injection material flowing down from the hopper.

9. The spray treatment device of claim 7 or 8,

the valve element driving mechanism moves the valve element between a position where the valve element abuts against the valve seat and the retracted position while tracing a substantially circular arc track.

10. A control method of an ejection processing apparatus, the ejection processing apparatus comprising: a hopper storing a spray material; a pressurization tank in communication with the hopper; a valve device that is disposed in a communicating portion between the hopper and the pressure tank and opens and closes the communicating portion; and a nozzle that ejects the ejection material pressure-fed from the pressure tank to the high-pressure air flow toward the work,

it is characterized in that the preparation method is characterized in that,

the control method of the ejection processing apparatus includes:

opening the pressure tank to atmospheric pressure temporarily;

when the pressure in the pressure box is detected to be atmospheric pressure, the valve device is opened, and the injection material in the loading hopper flows downwards to be supplied into the pressure box;

closing the valve device when the injection material is fed downward into the pressure tank for a predetermined time and/or a predetermined amount; and

pressurizing the inside of the pressurized tank when the valve device is closed,

the communicating portion is opened and closed by the valve device by bringing a valve element and a valve seat included in the valve device into contact with each other and pressing the valve element and the valve seat relatively,

the pressing force of the valve element pressing the valve seat after the pressurization in the pressurization tank is set to be lower than the pressure in the pressurization tank.

11. The control method of the spray processing apparatus according to claim 10,

when the valve device is opened, the valve body is retracted so that a surface of the valve body that is in contact with the valve seat faces downward.

12. The control method of the spray treatment apparatus according to claim 10 or 11,

when the valve device is opened, the valve body is retracted to the outside of the virtual flow area of the ejection material.

Technical Field

The present invention relates to an ejection processing apparatus and a control method of the ejection processing apparatus.

Background

There is known a blasting apparatus for performing surface treatment such as blasting or shot blasting by ejecting a solid-gas two-phase flow in which a blasting material is mixed in a high-pressure gas flow from an ejection nozzle toward a workpiece. The jet processing device includes: a type (direct pressure type) in which a jet material is pressure-fed and mixed with a high-pressure gas in a path from a high-pressure gas generation source to a nozzle, thereby being jetted as a solid-gas two-phase flow; and a type (suction type) in which the ejection material is sucked into the nozzle by a negative pressure generated inside the nozzle and mixed with a high-pressure gas, thereby ejecting the ejection material as a solid-gas two-phase flow. The direct pressure type spray treatment apparatus has an advantage of high surface treatment capability.

The direct-pressure type spray treatment apparatus includes a pressure tank for conveying a spray material under pressure to a nozzle for spraying the spray material to a flow path of a high-pressure gas. The injection material supply port of the pressure tank includes a valve device for supplying and stopping the injection material. Since the valve device is often in direct contact with the injection material, the movable portion or the valve body may be damaged. As a result, there is a possibility that the valve device may malfunction and the sealing performance of the pressure tank may deteriorate.

Patent document 1 discloses an apparatus including two upper and lower tanks, a detection tray for a spray material, an upper tank valve provided in a spray material supply portion of the upper tank, and a lower tank valve provided between the upper tank and the lower tank, wherein the spray material is automatically supplied by controlling the timing of opening and closing the upper and lower valves based on an increase or decrease in the spray material detected by the detection tray.

In the above-described device, the cylinder for driving each valve is configured to slide linearly, and is provided directly below the drop passage of the injection material. Since each cylinder is in contact with the injection material, malfunction or breakage may occur.

Patent document 2 discloses an air blower device in which a spherical valve body is driven by a cylinder (actuator) that slides linearly, thereby controlling the amount of injection material supplied.

In the above-described device, the cylinder rod is provided at a position shifted from the drop path of the injection material, but the chance of contact with the injection material cannot be considered small. Further, since the valve body is located directly below the drop passage of the injection material, there may be a problem with respect to the durability of the valve device, as described above.

Disclosure of Invention

An object of the present invention is to provide an injection treatment apparatus including a highly durable valve device, and a method of controlling the injection treatment apparatus.

The present invention adopts the following means to solve the above-described problems.

That is, one aspect of the present invention is a blasting apparatus for mixing a blasting material with a high-pressure gas flow and blasting the mixture from a nozzle toward a workpiece. The injection treatment device comprises a charging hopper, a pressurizing box and a valve device. The hopper stores the spray material. The pressurizing tank communicates with the lower portion of the hopper and the inside is pressurized. The valve device is disposed in a communicating portion between the hopper and the pressure tank. The valve device includes a valve element and a valve seat. The pressing force of the valve element pressing the valve seat is set to be lower than the pressure in the pressurizing tank.

According to the above configuration, even if the ejection material is sandwiched between the valve body and the valve seat, the pressurizing force of the ambient air is high, and therefore the sandwiched ejection material can be efficiently removed. Therefore, abrasion of the valve body and the valve seat can be prevented.

In one aspect of the present invention, the valve seat includes a protrusion protruding downward.

According to the above configuration, since only the small-area protruding crown portion abuts on the valve body, the contact area is small, and the sandwiching of the injection material can be suppressed. As a result, an injection processing apparatus including a valve device having high durability can be provided.

In one aspect of the present invention, the protrusion is a ridge.

According to the above configuration, since the contact area between the valve seat and the valve element can be set to a small area, it is difficult to sandwich the injection material between the valve seat and the valve element, and abrasion of the valve seat and the valve element can be suppressed.

In one aspect of the present invention, a surface of the valve element that abuts against the valve seat is a flat surface.

According to the above configuration, the small-area protruding crown portion abuts only the flat surface, and therefore the contact area can be reliably reduced. As a result, the possibility of sandwiching the injection material is further reduced, and therefore, it is possible to provide an injection processing apparatus including a valve device with higher durability.

In one aspect of the present invention, the protrusion has a substantially circular shape so as to surround the opening of the valve seat.

According to the above configuration, the ridge can be formed easily.

In one embodiment of the present invention, the protrusion is formed of an elastic O-ring.

According to the above configuration, the protrusion for suppressing the sandwiching of the injection material can be used as a sealing device of the valve seat and the valve body, and therefore the injection processing apparatus including the valve device having high durability can be provided at low cost.

In one aspect of the present invention, the valve device further includes a valve element driving mechanism. The valve element driving mechanism is a mechanism that moves the valve element to a position abutting against the valve seat or a position away from the valve seat. When the valve element is moved away from the valve seat, the valve element driving mechanism drives the flat surface to face substantially downward.

According to the above configuration, the ejection material flowing down from above is less likely to adhere to the flat surface, and hence the sandwiching can be suppressed. As a result, an injection processing apparatus including a valve device having high durability can be provided.

In one aspect of the present invention, when the valve body is moved away from the valve seat, the valve body driving mechanism drives the valve body so that the valve body is retracted to the outside of the virtual flow region of the injection material flowing down from the hopper.

According to the above configuration, the ejection material flowing down from above is less likely to adhere to the flat surface, and hence the ejection material can be prevented from being caught. As a result, an injection processing apparatus including a valve device having high durability can be provided.

In one aspect of the present invention, the valve element driving mechanism moves the valve element between a position of abutting against the valve seat and a retracted position while tracing a substantially circular arc orbit.

According to the above configuration, the flat surface of the valve body can be directed downward by forming the separation/pressing rail so as to describe the circular arc rail. Further, the retraction of the spool to the outside of the virtual flow region can be realized by one arm device. Therefore, it is possible to provide an injection processing apparatus including a valve device having high durability simply and inexpensively.

Another aspect of the present invention is a control method of an ejection processing apparatus. The spray treatment device comprises a charging hopper, a pressurizing box, a valve device and a nozzle. The hopper stores the spray material. The pressurizing box is communicated with the charging hopper. The valve device is disposed in a communicating portion between the hopper and the pressure tank, and opens and closes the communicating portion. The control method of the ejection processing apparatus includes the following (1) to (4).

(1) The inside of the pressurized tank is temporarily opened to atmospheric pressure.

(2) When the pressure in the pressure tank is detected to be atmospheric pressure, the valve device is opened and the injection material in the hopper is fed downward into the pressure tank.

(3) When the injection material is fed downward into the pressure tank for a predetermined time and/or a predetermined amount, the valve device is closed.

(4) When the valve means is closed, the pressure in the pressure tank is increased.

Further, the valve body and the valve seat included in the valve device are brought into contact with each other and pressed against each other, whereby the coupling portion is opened and closed by the valve device. Further, the pressing force of the valve element pressing the valve seat after the pressurization in the pressurization tank is set to be lower than the pressure in the pressurization tank.

According to the above configuration, even if the injection material is sandwiched between the valve body and the valve seat, the pressurizing force of the ambient air is high, so that the sandwiched injection material can be efficiently removed from the state of being sandwiched between the valve body and the valve seat, and abrasion of the valve body and the valve seat can be prevented.

In the control method according to one aspect of the present invention, when the valve device is opened, the valve body is retracted outside the virtual flow region of the injection material.

According to the above configuration, since the injection material flowing down from above is less likely to adhere to the valve body, it is possible to suppress the injection material from being caught between the valve body and the valve seat. As a result, an injection processing apparatus including a valve device having high durability can be provided.

In the control method according to one aspect of the present invention, when the valve device is opened, the valve body is retracted so that a surface of the valve body that abuts the valve seat faces downward.

According to the above configuration, the injection material flowing down from above is less likely to adhere to the surface of the valve body on the side of contact with the valve seat, and therefore, the injection material can be prevented from being caught between the valve body and the valve seat. As a result, an injection processing apparatus including a valve device having high durability can be provided.

According to the present invention, there are provided an ejection processing apparatus including a valve apparatus having high durability, and a control method of the ejection processing apparatus.

Drawings

Fig. 1 is a schematic configuration diagram of an ejection processing apparatus according to an embodiment of the present invention.

Fig. 2 is a side sectional view of a main part of the spray processing device shown in fig. 1.

Fig. 3 is a side sectional view of the spray treatment device as viewed in the direction of arrow P in fig. 2.

Fig. 4 (a) is an enlarged sectional side view of the valve device according to the embodiment of the present invention, and fig. 4 (b) is a sectional view taken along line a-a of (a).

Fig. 5 is a diagram illustrating an operation of a valve device according to an embodiment of the present invention, in which fig. 5 (a) is an enlarged sectional side view of the valve device, and fig. 5 (B) is a sectional view of the valve device taken along line B-B of fig. 5 (a).

Fig. 6 is a diagram illustrating an operation of the valve device according to the embodiment of the present invention, and is an enlarged side sectional view of the valve device.

Fig. 7 is a flowchart for explaining a general operation procedure of the spray processing device 1 of the present invention.

Fig. 8 is a schematic enlarged sectional view of the communicating portion of the hopper and the pressure tank of the present invention.

(symbol description)

1 spray treatment device

2 charging hopper

3-valve device

4 pressurized box

4a communication part

9 spray material

27 opening part

28a valve seat

41 valve core

49O-ring

R falling path of the spray material (imaginary flow area of the spray material flowing down from the hopper)

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(embodiment mode)

Fig. 1 is a schematic configuration diagram of an ejection processing apparatus 1 according to an embodiment of the present invention. The spray treatment device 1 includes: a hopper 2 for supplying a spray material; a pressurized tank 4 for storing the sprayed material; a valve device 3 provided between the hopper 2 and the pressure tank 4; a cabinet 6 having an area inside which the workpiece 5 is processed by ejecting the blasting material 9 from the nozzle 11; and a control unit 7.

The hopper 2 stores a shot material and feeds the shot material downward to a pressurizing tank 4 communicating with the lower side of the hopper 2. The pressurizing tank 4 increases the internal pressure to pressure-feed the injection material appropriately supplied from the hopper 2 to the injection hose 12 communicating with the lower side.

As described above, the valve device 3 is provided in the communication portion 4a between the hopper 2 and the pressure tank 4. The pressurized tank 4 includes an air supply port 10, and is connected to a spray hose 12 for pressure-feeding the spray material 9 to a nozzle 11 in the cabinet 6, and the air supply port 10 supplies spray air for pressurizing the pressurized tank 4 and pressure-feeding the spray material 9.

The valve device 3 includes a valve seat 28a (described later) for opening and closing a communication portion 4a of the hopper 2 communicating with the pressure tank 4, and a valve body 41 (described later) for opening and closing an opening portion 27 (described later) of the valve seat 28a, and the valve body 41 opens and closes the valve seat 28a and the opening portion 27 by an actuator 8 (driving source).

The bottom of the cabinet 6 is connected to a recovery duct 13, and the recovery duct 13 is connected to a mechanism (not shown) for separating the collected blasting material 9 from dust generated by processing the workpiece 5 and supplying the dust by circulation. Here, the jet air supply port 10, the nozzle 11, and the jet hose 12 constitute a jet device 14.

The control unit 7 is a microcomputer including a CPU, a memory, various buses, and the like, which collectively control the operation of the ejected material processing apparatus 1.

The operation of the injection processing apparatus 1 is controlled by the control unit 7. Specifically, the control unit 7 performs the following control: the spray material 9 is supplied from the hopper 2 to the pressure tank 4, the opening portion is driven to open and close by the actuator 8 of the valve device 3, the operation of opening and closing the air supply port 10 for pressurizing the pressure tank 4 and conveying the spray material 9 under pressure and the spray air pressure are adjusted, and the spray nozzle 11 sprays the spray material 9 to the workpiece 5. As indicated by the broken line arrows, the control unit 7 drives and controls the ejection processing device 1 by communicating with each controlled unit.

Next, the valve device 3 will be described in detail. Fig. 2 is a side sectional view of the valve device 3, and fig. 3 is a side sectional view of the valve device 3 as viewed from the direction of arrow P in fig. 2.

The valve device 3 is provided in a communication portion 4a between the hopper 2 and the pressure tank 4. The communication portion 4a has a valve body space 24 defined by the upper wall 21, the side wall 22, and the lower wall 23. The valve body space 24 is provided to communicate with the hopper 2 and the pressure tank 4 through a jet material supply port 25 formed in the upper wall 21 and a jet material drop port 26 formed in the lower wall 23 and directed toward the pressure tank 4. In the injection material supply port 25, a valve seat structure member 28 having an opening portion 27 communicating with the injection material supply port 25 is fixed to the upper wall 21 by a bolt or the like. The opening 27 of the valve seat structure member 28 allows the injection material to fall into the pressure tank 4, and the lower surface around the opening 27 of the valve seat structure member 28 is a valve seat 28 a. Here, the opening 27 constitutes an opening of the valve seat 28 a.

The valve body space 24 includes a support body 30, and the support body 30 is fixed to a valve support shaft 29 provided on a side of a drop passage R of the injection material (a virtual flow area of the injection material 9 flowing down from the hopper 2) as a supply path of the injection material. The support body 30 supports the valve body 41, and the support body 30 and the valve body 41 can be rotated between a valve closing position T depicted by a solid line and a valve opening position U depicted by a two-dot chain line by rotation of the valve support shaft 29. The valve body 41 closes the opening portion 27 of the valve seat structural member 28 at the valve closing position T. The valve support shaft 29 is coupled to a main shaft 31a of a rotary actuator 31, and is driven to rotate as indicated by a circular arrow Q by driving the rotary actuator 31. At this time, the central axis of the valve support shaft 29 serves as a pivot point of the support body 30. Although the valve body 41 will be described in detail later, the valve body 41 is biased toward the valve seat 28a with respect to the support body 30 by a spring 42 (biasing member) at a position where the opening 27 is closed.

Among the above-described components, the valve seat structural member 28, the valve support shaft 29, the support body 30, the rotary actuator 31, the valve body 41, and the spring 42 constitute the valve device 3. The valve support shaft 29, the support body 30, the rotary actuator 31, and the spring 42 constitute a valve element drive mechanism 31A.

Fig. 4 (a) is an enlarged sectional view of the valve device 3 in fig. 2. Fig. 4 (b) is a sectional view taken along line a-a of fig. 4 (a). The support body 30 includes a drive arm 46, a support holder 45, and an urging member holder 43, and the base portion of the drive arm 46 is fixed to the valve support shaft 29 together with the support holder 45 by a bolt.

The valve body 41 has a cylindrical protruding portion 41a and a cylindrical recessed portion 41b on the inner side including the center axis of the cylindrical protruding portion 41a, and the protruding portion 41a protrudes on the opposite side (downward in fig. 4a) of a closing surface 41d of the valve body 41 that abuts against the valve seat 28a of the valve seat structure member 28. The cylindrical recess 41b has a recess 41c having a smaller inner diameter than the recess 41 b. The biasing member holder 43 is formed in a cylindrical shape with a diameter that is positioned in a cylindrical recess 41b formed in the valve body 41 with a gap S. The biasing member holder 43 has a cylindrical recess 43c facing the recess 41 b. The spring 42 is compressed and housed in a space defined by the recess 41c of the valve body 41 and the recess 43c of the biasing member holder 43, and biases the valve body 41 and the biasing member holder 43 in a direction of separating them from each other.

As shown by a broken line in fig. 4 (a), the valve body 41 is formed with an elongated hole 48. An engagement hole 44 is formed in the biasing member holder 43. The valve body 41 and the biasing member holder 43 are coupled by embedding an engagement pin 47 in an elongated hole 48 of the valve body 41 and an engagement hole 44 of the biasing member holder 43. In this case, the diameter of the engagement hole 44 of the biasing member holder 43 is formed slightly smaller than the diameter of the engagement pin 47, and the engagement pin 47 is driven to be tightly fitted. As shown by the broken line in fig. 4 (a), the elongated hole 48 of the valve body 41 has an elliptical shape and is formed larger than the engaging pin 47.

In addition to the above configuration, the valve body 41 can rotate about the axis of the engagement pin 47 with respect to the biasing member holder 43 within a certain range in a state of being biased by the spring 42. Since the engagement pin 47 is configured to engage with the elongated hole 48 of the valve body 41, each end portion of the engagement pin 47 in the axial direction can be moved in the elongated hole 48. Thus, the center axis W (see fig. 4 (a)) of the closing surface 41d of the valve body 41 facing the valve seat 28a can swing in any direction. Therefore, the closing surface 41d can be in contact with the valve seat 28a with which the closing surface 41d is in contact in a following manner.

In the present embodiment, the valve body 41 and the valve seat structural member 28 are formed of a steel material such as a metal. The closing surface 41d of the valve body 41 is formed as a flat surface and is mirror finished. An annular groove 49a is formed in the valve seat 28a, and an O-ring 49 is fitted in the groove 49 a. The O-ring 49 has a substantially circular shape and a protrusion protruding downward so as to surround the opening 27.

Next, a general operation process of the spray processing apparatus 1 will be described with reference to fig. 1 and 7. Fig. 7 is a flowchart for explaining a general operation process of the injection processing apparatus 1.

In the injection processing apparatus 1, initially, the opening 27 of the valve device 3 communicating with the hopper 2 is closed. The air supply port 10 for supplying the jet air is opened, and the pressure tank 4 is pressurized to a state where the jet processing can be performed. The ejection of the ejection material 9 from the nozzle 11 is stopped.

When the spray processing step is started (S00), the spray material 9 starts to be sprayed from the nozzle 11 toward the workpiece 5, and the machining of the workpiece 5 is continued by turning on and off a clamp valve (not shown) provided in the middle of the spray hose 12 (S01).

The shot material 9 in the pressurized tank 4 is used for machining the workpiece 5. The amount of the abrasives 9 in the pressure tank 4 is monitored by a sensor (not shown), and when the abrasives 9 having a predetermined value or more are stored in the pressure tank 4 (no in S02), the abrasive blasting process is continued (S01). When the amount of the ejection material 9 in the pressure tank 4 is equal to or less than the predetermined value (yes in S02), the ejection of the ejection material 9 from the nozzle 11 is stopped, and the air supply port 10 is closed. Next, an air inlet (not shown) for returning the pressure tank 4 to the atmospheric pressure is opened. Next, the outside air is introduced into the pressure tank 4 until the pressure tank 4 becomes the atmospheric pressure (S03). When the pressure tank 4 becomes atmospheric pressure, the actuator 8 driving the valve device 3 is opened to open the opening 27 of the valve device 3, and the intake port is closed again (S04).

Next, the spouting material 9 flows down from the hopper 2, and the spouting material 9 is supplied to the pressure tank 4 through the opening portion 27 of the valve device 3 (S05). Whether or not the abrasives 9 are supplied by a predetermined amount is monitored by an elapsed time or a sensor, and when the abrasives do not satisfy the predetermined time and/or the predetermined amount of the downflow supply (no in the condition of S06), the downflow of the abrasives is continued (S05). When the spray material is supplied in a state of satisfying a predetermined time and/or a predetermined amount of flow-down (yes in S06), the flow-down spray material is stopped (S07). Thereafter, the actuator 8 driving the valve device 3 is closed to close the opening 27 of the valve device 3 (S08). Subsequently, the air supply port 10 is opened, and the jet air is introduced into the pressurized tank 4. The inside of the pressurizing tank 4 is pressurized by introducing the jet air. At this time, the pressure of the jet air is controlled so that the pressure in the pressurizing tank is a predetermined pressure, and a sufficient pressure is applied to the jet material pressure-feeding mechanism (not shown) (S09). When the pressure in the pressure tank 4 and the pressure applied to the injection material pressure-feed mechanism are in a sufficient state, the state returns to the above-described initial state (S10). Thereafter, a series of steps from the start of the ejection processing step (S00) is repeated.

In the valve device 3 having the above-described configuration, a series of operations from the supply of the injection material to the pressurization in the pressurization tank will be described below with reference to fig. 2, 3, 5, and 6.

In the initial state, the pressure tank 4 is at atmospheric pressure, and the valve body 41 of the valve device 3 is positioned away from the opening 27 and retreats to the side of the drop passage R of the injection material as shown by the two-dot chain line U in fig. 2. In this way, in a state where the drop passage R of the blasting material communicates with the upper hopper 2 through the opening portion 27, the blasting material is dropped and supplied from the upper hopper 2 to the pressure tank through the drop passage R of the blasting material. After a sufficient amount of the injection material is supplied, the valve support shaft 29 is rotated in the direction of the circular arrow Q by the rotary actuator 31 in fig. 3, the support body 30 moves to the position T indicated by the solid line in fig. 2, and the valve body 41 moves to the position where the opening 27 is closed.

Fig. 5 (a) is an enlarged cross-sectional view showing a state where the valve element 41 and the valve seat structural member 28 are in the closed position. Fig. 5 (B) is a view including the O-ring 49 when viewed from B-B in fig. 5 (a). In this state, the closing surface 41d of the valve body 41 and the valve seat 28a are caused to follow the closing surface 41d of the valve body 41 and the valve seat 28a by the biasing force of the spring 42. In this case, the rotary actuator 31 does not apply a force pressing the closing surface 41d against the valve seat 28 a. The force that brings the closing surface 41d of the valve body 41 into contact with the valve seat 28a is only the biasing force of the spring 42, and the rotary actuator 31 rotates only the valve support shaft 29 to position the valve body 41 at a position where the biasing force of the spring 42 is effective.

In this state, the shot material 9 may be sandwiched between the sealing surface 41d of the valve body 41 and the O-ring of the valve seat 28a, and in this case, a gap V is generated. The pressurizing tank 4 is pressurized from the above state. When the pressurization is started, the pressure in the spool space 24 of the valve device 3 in fig. 2 and 5 communicating with the pressurized tank 4 also rises, so that a pressure difference is generated between the spool space 24 of the valve device and the space 53 communicating with the upper portion of the valve seat structural member 28 of the hopper 2. Due to the above-described pressure difference, a flow of air is generated from the valve core space 24 toward the gap V as indicated by an arrow d. Due to the flow of the air described above, a part of the blast material 9 sandwiched in the gap V is blown off toward the space 53 communicating with the hopper 2 as indicated by the arrow e. Since a part of the ejection material 9 sandwiched in the gap V blows off, the gap V is further narrowed, the pressure difference between the spool space 24 and the space 53 is increased, the flow velocity of the air of the arrow d is further accelerated, the ejection material 9 flowing out as shown by the arrow e is increased, and finally, all the ejection material 9 sandwiched in the gap V blows off.

In order to achieve the above operation, the biasing force of the spring 42 is set to a pressing force that causes the pressurized air in the pressure tank 4 to flow the injection material 9 sandwiched between the valve body 41 and the valve seat 28a toward the opening 27 side during the closing operation of the opening 27.

Fig. 6 shows a state in which all the shots 9 sandwiched in the gap V of fig. 5 (a) are blown off and the gap V disappears. In this state, the closing surface 41d of the valve body 41 and the valve seat 28a are in contact with each other without a gap by the force of the pressure indicated by the arrow F of the space 24 communicating with the pressurized tank 4. At the same time, the pressure of arrow F presses the O-ring 49 to maintain the tightness of the pressure tank 4, and the pressure tank 4 can be pressurized to a desired pressure.

Fig. 8 is a schematic enlarged cross-sectional view of the communicating portion 4a of the hopper 2 and the pressurized tank 4 of the present invention. As in fig. 2, the valve closing position T and the valve opening position U are depicted by solid lines and two-dot chain lines with respect to the support body 30 and the valve body 41 in the pressure tank 4. A partition wall 83 is provided inside the hopper 2, and the partition wall 83 partitions a lower space 81 near the pressurized tank 4 in the hopper 2 from an upper space 82 located above the lower space 81. The spouting material 9 is stored in the upper space 82 of the hopper 2. The partition wall 83 is provided with a downflow port 84 for flowing the spray material down to the pressure tank 4. The downflow port 84 includes a butterfly valve 85 for closing or opening the downflow port 84, and is driven between a closing position C indicated by a solid line and an opening position D indicated by a two-dot chain line.

When the injection material 9 is caused to flow down, the support body 30 and the valve body 41 are positioned at the valve open position U, and the butterfly valve 85 is driven to the open position D to cause the injection material 9 to flow down to the pressure tank 4. When the flow of the injection material 9 is stopped, first, the butterfly valve 85 is driven to the closed position C, and the support body 30 and the valve body 41 are positioned at the valve closed position T. At this time, as described above, the valve body 41 is biased toward the valve seat 28a by the biasing force of the spring 42, and the injection material 9 is sandwiched between the valve body 41 and the valve seat 28 a. From this state, as indicated by a chain line arrow 86, the pressurizing tank 4 is pressurized to blow the blasting material 9 toward the hopper 2. Since the hopper 2 includes the lower space 81, the blasting material 9 can be blown off to the lower space 81.

As described above, in the valve device 3 of the injection processing device 1 according to the present embodiment, since the closing surface 41d of the valve body 41 is caused to follow the valve seat 28a by the biasing force of the spring 42 at the closing position of the valve body 41, even if the injection material 9 is sandwiched between the closing surface 41d of the valve body 41 and the valve seat 28a, the injection material 9 sandwiched by the pressurization of the pressurization tank 4 can be blown off to the space on the hopper 2 side through the opening 27.

Since the pressing force of the sealing surface 41d against the valve seat 28a when the injection material 9 is blown off is a weak pressing force of the spring 42, it is difficult for the sealing surface 41d and the valve seat 28a to be worn by the movement of the injection material 9 between the sealing surface 41d and the valve seat 28 a. Further, since the valve body 41 and the valve seat structural member 28 are formed of a steel material such as a metal, the valve device 3 having high wear resistance and durability can be configured. For example, a hard chromium plating layer having excellent wear resistance may be applied to the closed surface 41 d.

The valve seat structure member 28 includes a protrusion protruding downward so as to surround the opening 27, and the valve body 41 and the valve seat structure member 28 are in line contact because the closing surface 41d of the valve body 41 facing the valve seat 28a is formed as a flat surface. That is, the pressurizing tank 4 can be easily pressurized and the ejection material 9 sandwiched in the gap between the valve body 41 and the valve seat structure member 28 can be easily blown off. Further, since the closing surface 41d of the valve body 41 is mirror-finished, the frictional resistance with the injection material 9 can be reduced, and the injection material 9 sandwiched in the gap between the valve body 41 and the valve seat structure member 28 can be blown off more easily.

The support body 30 is rotatably supported by the valve support shaft 29 with a pivot point on a side of the drop passage R of the injection material formed below the opening 27, and the valve body 41 is movable while drawing a substantially circular arc orbit between a position closing the opening 27 and a position away from the opening 27 and retreating to the side of the drop passage R of the injection material. When the valve body 41 is located at a position away from the opening 27, the valve body 41 is located at a position retreating to the side of the drop passage R of the ejection material, and the closing surface 41d of the valve body 41 is positioned to face substantially downward. This makes it possible to prevent the spray material 9 from adhering to the valve body 41 when the spray material 9 is supplied to the pressure tank 4 by dropping from the hopper 2 located above the valve device 3 through the spray material drop passage R, and to reduce the spray material 9 adhering to the valve body 41 and the valve seat 28a when the opening 27 is closed by the valve body 41, thereby preventing the valve seat 28a and the valve body 41 from being worn.

Further, the drive source for moving the support body 30 that supports the valve body 41 in the closed position T and the open position U is executed by the rotary actuator 31. Since the rotary actuator 31 is a driving source for rotary sliding, the sliding surface is covered in the sprayed material. Therefore, the sliding surface is not exposed to the injection material, as compared with a cylinder actuator that slides linearly, and therefore, abrasion of the injection material can be prevented.

Therefore, by including the valve device 3 configured as described in the present embodiment, the injection processing apparatus 1 including the valve device 3 having high durability against the pressurized tank 4 can be provided.

In the above embodiment, the O-ring is provided on the valve seat 28a, but an annular protrusion may be directly provided on the valve seat 28a without providing the O-ring, and in short, a protrusion may be provided on the valve seat 28a in order to reduce the contact area between the valve seat 28a and the sealing surface 41 of the valve body 41.

In the above embodiment, the closing surface 41d of the valve element 4 is described as being in contact with the valve seat 28a at the closing position of the valve element 41 before the pressurization of the pressurization tank 4, but the present invention is not limited to this, and any gap may be used as long as a flow of air is generated in the gap between the valve element 41 and the valve seat 28a by the pressurization of the pressurization tank 4, and the ejection material 9 sandwiched between the valve element 41 and the valve seat 28a is caused to flow to the outside of the pressurization tank 4, and the contact may not be made.

In addition, instead of the above-described respective configurations, in a state where the valve seat 28a is closed by the closing surface 41d of the valve body 41, the ejection material 9 sandwiched between the closing surface 41d and the valve seat 28a may be allowed to flow to the opening 27, and the valve body 41 may be pressed against the valve seat 28a by the driving force of the rotary actuator 31.

As described above, the injection processing apparatus 1 is an apparatus including: the injection material 9 is supplied from the hopper 2 into the pressure tank 4 through the valve device 3, and then the valve body 41 is brought into contact with the valve seat 28a, and the valve device 3 is closed by pressing, thereby pressurizing the pressure tank 4.

Further, as a control method of the above-described ejection processing apparatus, the following is included: temporarily opening the pressure tank 4 to atmospheric pressure; opening the valve device 3 when it is detected that the pressure inside the pressure tank 4 is set at the atmospheric pressure, and feeding the blasting material 9 in the hopper 2 downward into the pressure tank 4; closing the valve device 3 when the injection material 9 is supplied into the pressure tank 4 for a predetermined time and/or a predetermined amount; the following may be adopted in order to pressurize the inside of the pressure tank 4 when the valve device 3 is closed; when the pressing force of the valve body 41 pressing the valve seat 28a when the pressure is applied to the pressure tank 4 is set to be lower than the pressure in the pressure tank 4, the pressurized air in the pressure tank 4 flows the injection material 9 sandwiched between the valve body 41 and the valve seat 28a toward the hopper 2.

According to the control method of the ejection processing apparatus, even if the ejection material is sandwiched between the valve element and the valve seat, the pressurized pressure of the air around the ejection material is high, so that the sandwiched ejection material can be efficiently removed from the state of being sandwiched between the valve element and the valve seat, and abrasion of the valve element and the valve seat can be prevented.

(modification example)

Next, a modification of the present embodiment will be described with reference to fig. 4 (a). The present modification differs from the above-described embodiment in that it includes a nozzle H that blows compressed air toward the opening portion 27, and is shown by a two-dot chain line in fig. 4 (a) in the present modification. The nozzle H blows compressed air to the gap V in fig. 5 (a) while pressurizing the pressurizing tank 4, and thereby the effect of blowing away the ejection material 9 sandwiched between the valve body 41 and the valve seat structure member 28 can be greatly improved.

The present modification is configured to drive the injection processing apparatus by the same operation as the above-described embodiment, and to obtain the same operation and effect as the above-described embodiment, except that the compressed air is blown to the gap V through the nozzle H, which contributes to blowing off the injection material 9 sandwiched between the valve body 41 and the valve seat structure member 28.

(supplementary explanation of embodiment)

The blasting apparatus according to the above embodiment may be an apparatus for blasting or an apparatus for shot blasting. Further, the apparatus may be configured to spray or collide a spray material onto a surface to be processed to form a coating derived from the spray material.

Examples of the blasting material include iron-based and nonferrous metal-based blasting particles, cutting wires, and grids, ceramic particles (e.g., alumina, silicon carbide, zircon, etc.), glass particles, resin particles (e.g., nylon resin, melamine resin, urea resin, etc.), and particles obtained by grinding plant seeds (e.g., walnuts, peaches, etc.), and the like, and the blasting material in the above embodiment is not particularly limited. In addition, when particles having high grinding ability such as ceramic particles in the above-described examples are used as the injection material, the configuration of the above-described embodiment can be particularly preferably applied because the operation is not good and the sealing property of the pressure tank is significantly deteriorated when the injection material is sandwiched in the conventional valve device.