JP5635880B2 - Thermal spray equipment - Google Patents

Description

  The present invention relates to a thermal spraying apparatus that sprays a thermal spray material on the wall surface in order to repair the wall surface of a coke oven.

  The number of coke ovens that have been built for many years has been increasing, and the walls are repaired as appropriate. In this case, it is not preferable to repair the wall surface by completely stopping the coke oven from the viewpoint of labor, labor, time, and cost. Therefore, the wall surface is repaired exclusively during operation. As a method for repairing the wall surface of the coke oven, there are a plasma spraying method using a large thermal spraying device, a laser spraying method, a flame spraying method, and the like. However, in practice, a method using the thermite reaction, that is, a thermal spraying device (see Patent Document 1) sends out a thermal spray material that is a mixture of metal powder and refractory, and sprays the thermal spray material from the lance to the repaired part to spray the spray ( A method in which a thermal spray material is deposited on a product formed by thermite reaction with oxygen is frequently used.

JP2009-047317

  In the method of spraying a thermal spray material on the repaired portion of the wall surface and depositing the thermal spray material, oxygen that promotes thermite reaction is used for conveying the thermal spray material. For this reason, there is no problem when the thermal spray material and oxygen are smoothly injected from the lance and the thermite reaction occurs on the repair surface of the wall surface. However, if the fire at the repair site burns out and ignites at the lance nozzle = "front-end ignition" or the situation where the fire goes back from the lance to the thermal spraying device through the supply hose = "backfire" Become. Tip ignition may induce backfire. Backfire causes an explosion exceeding the speed of sound with volume expansion (referred to as “detonation”), causing the supply hose to burst or the supply hose separated from the thermal spraying device to jump around.

  In this way, flashback causes a very dangerous situation and takes time for recovery work, but it is difficult to identify the cause and it is difficult to avoid the occurrence itself. From now on, on the premise that the occurrence of flashback is unavoidable, it is customary to take some measures against flashback in the thermal spraying device. For example, a thermal spraying device and a supply hose are connected in a state where they are just fitted without using a quick joint (commonly known as “coupler”), and the thermal spraying device and the supply hose are separated using volume expansion or explosion caused by flashback. In order to prevent the supply hose from rupturing, the combustion gas generated during the explosion is discharged. In this measure, an explosion may occur at the thermal spraying device, possibly damaging the thermal spraying device, but it is considered preferable to exposing the worker to danger.

  However, in the above-described measures for separating the thermal spraying device and the supply hose using volume expansion or explosion caused by flashback, if the sprayed material continues to be sprayed after the thermal spraying device and the supply hose are separated, The sprayed material may stick to the supply port of the device (the output port of the ejector), making recovery work difficult. Therefore, a study was conducted to add an emergency stop mechanism that reliably stops the supply of thermal spray material and oxygen to the thermal spray equipment that took measures to separate the thermal spray equipment and supply hose using volume expansion or explosion caused by flashback. did.

  As a result of the study, the developed hopper connected the hopper storing the sprayed material to the mixing port of the ejector, the supply hose to the output port of the ejector, and the oxygen supply line to the input port of the ejector. An emergency closing valve interposed in an oxygen supply line in a thermal spraying apparatus that mixes thermal spray material from a hopper into oxygen supplied to an ejector, and supplies the thermal spray material and oxygen from the ejector to a lance in a mixed state through a supply hose, An oxygen branch line branched from the oxygen supply line, a hose detection valve connected to the oxygen branch line, a pressure line connecting the hose detection valve and the emergency closing valve, and an oxygen exhaust valve provided in the pressure line Is a thermal spraying device that constitutes an emergency stop mechanism.

  The emergency closing valve has an oxygen supply line connected to the input port, an ejector input port connected to the output port, and a pressurization line connected to the pilot port. This is a switching valve that switches between communication and blocking of the output port. For example, in an emergency closing valve, when an open / close valve that switches between communication and shut-off of an input port and an output port is opened in a normal state to connect the input port and the output port, the pressure of oxygen supplied to the pressurization line is received by the pilot port. The on-off valve is closed to shut off the input port and the output port. Thereby, the supply of oxygen to the ejector is stopped, and the supply of the sprayed material and oxygen to the supply hose can be stopped without the suction of the sprayed material from the hopper by the ejector. The blocked input port and output port exhaust oxygen from the pressurization line through an oxygen exhaust valve, which will be described later, and close the on-off valve to make it communicate again.

  The hose detection valve has an oxygen branch line connected to the input port and a pressure line connected to the output port. The pilot projection protrudes in front of the output port of the ejector, and the supply hose removed from the output port contacts the pilot projection. This is a switching valve that switches between communication and disconnection of the input port and the output port by displacing. For example, a hose detection valve energizes a switching block that switches between communication and disconnection of an input port and an output port to shut off the input port and the output port in a normal state, and comes off from the output port of the ejector due to volume expansion or explosion caused by flashback. When the supply hose contacts the pilot protrusion and the switching block is pushed, the input port and the output port are temporarily communicated. When the supply hose is no longer in contact with the pilot protrusion, the switching block returns and the input port again. And shut off the output port.

  If the supply hose is configured to be connected only by fitting to the output port of the ejector, it will be easy to come off due to volume expansion or explosion due to flashback, and it will be easy to contact the pilot protrusion of the hose detection valve arranged near the output port. Become. Preferably, in order to prevent the supply hose detached from the output port of the ejector from being far away or out of order due to volume expansion or explosion due to backfire, the supply hose has a hook flange that engages with a stopper provided in front of the output port. It may be provided at the connection end. In this case, when the connection end of the supply hose comes out of the output port of the ejector due to volume expansion or explosion due to backfire, the hook flange is easily brought into contact with the hose detection valve. Since the supply hose is often connected to the output port of the thermal spraying device via an exchange hose, the supply hose referred to in the present invention includes an exchange hose in addition to the supply hose itself.

  The oxygen exhaust valve connects the pressurization line to the input port, opens the output port, protrudes the pilot projection that the operator presses, and displaces the pilot projection by the operator to connect the input port and the output port. And a switching valve for switching between cutoff and cutoff. For example, the oxygen exhaust valve is switched by operating the switching block that switches between communication and disconnection of the input port and output port so that the input port and output port are shut off normally, and the operator pushes or knocks down the pilot protrusion. When the block is pushed, the input port and the output port are communicated. When the operator stops operating the pilot, the switching block is restored and the input port and the output port are shut off again.

  When the pressurization line is provided with an indicator lamp that notifies the presence or absence of the pressurization state, it can be visually understood that the cause of the closing of the emergency closing valve is that the supply hose is disconnected from the emergency exit of the ejector. The indicator lamp can be exemplified by a configuration in which the colored protrusions are housed in a transparent cover and the colored protrusions are normally urged in the housing direction so as not to protrude from the cover. The indicator lamp projects the colored protrusion to a position where it can be seen from the cover when the pressure of the oxygen supplied to the pressurizing line is received by the pilot port and the colored protrusion is pushed. When oxygen is exhausted from the pressurization line, there is no pressure to push the colored protrusions, so that the sunk to a position where it cannot be seen again from the cover according to the bias.

  The present invention adds an emergency stop mechanism that reliably stops the supply of thermal spray material and oxygen to the thermal spraying device, facilitating the safety of the thermal spraying device and recovery after flashback. In the emergency stop mechanism of the present invention, the hose detection valve is operated by the supply hose removed from the output port of the ejector due to volume expansion or explosion caused by flashback, and then the emergency shutoff valve is closed. Correspondence with the supply stop is clear, and the supply of the thermal spray material and oxygen can be stopped reliably during the flashback. In addition, the emergency closing valve can be easily reopened by simply operating the oxygen exhaust valve, and the supply of the thermal spray material and oxygen can be resumed.

  The emergency stop mechanism of the present invention is characterized in that it does not have an electrical operation part and operates using oxygen flowing in the oxygen branch line. The indicator lamp added to the pressurization line also operates under the pressure of oxygen supplied to the pressurization line, and thus does not require electricity. Such an emergency stop mechanism and indicator light that do not require electricity have the effect of eliminating electrical components from the thermal spraying device, that is, eliminating the need for heavy batteries and easily damaged electronic devices from the thermal spraying device, reducing the weight of the thermal spraying device, The malfunction caused by the failure of the electronic device is eliminated, and the supply of the thermal spray material and oxygen is surely stopped.

It is the perspective view which looked at an example of the thermal spraying apparatus to which the emergency stop mechanism of this invention was applied from diagonally backward. It is the perspective view which looked at the thermal spray apparatus of this example from the diagonally upper left side. It is the perspective view which looked at a part of thermal spraying device of this example which opened the bonnet from the diagonally upper front. It is the block diagram which extracted the principal part of the emergency stop mechanism showing the state which supplies oxygen and a thermal spray material. It is a block diagram of the emergency stop mechanism showing the state which supplies oxygen and a thermal spray material. It is the block diagram which extracted the principal part of the emergency stop mechanism showing the state immediately after the supply hose removed from the output port of the ejector by backfire. It is a block diagram of the emergency stop mechanism showing the state immediately after a supply hose remove | deviates from the output port of the ejector by backfire. It is the block diagram which extracted the principal part of the emergency stop mechanism showing the state from which the supply hose removed from the output port of the ejector by backfire. It is a block diagram of the emergency stop mechanism showing the state which the supply hose removed from the output port of the ejector by backfire. It is the block diagram which extracted the principal part of the emergency stop mechanism showing the state which opened the emergency closing valve again. It is a block diagram of the emergency stop mechanism showing the state which opened the emergency closing valve again.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The emergency stop mechanism 1 of the present invention (see FIG. 4 and subsequent figures) is applied to a thermal spraying apparatus 2 having a hopper 21 and an ejector 22 with respect to a frame 25 as seen in FIGS. Since the thermal spraying apparatus 2 of this example uses the oxygen supplied to the ejector 22 to suck, mix and output the thermal spray material from the hopper 21, it does not require a drive source such as an electric motor. The emergency stop mechanism 1 also operates only with oxygen supplied due to the separation of the supply hose 24 from the ejector 22. From this, the thermal spraying apparatus 2 of this example does not have an electrical component. This means that there is no danger of electrical components short circuiting and generating sparks, for example igniting oxygen and exploding the thermal spray material. The advantage of the emergency stop mechanism 1 of the present invention is that it is not necessary to use such an electrical component.

  The frame 25 is a frame body in which metal round pipes are assembled. The frame 25 of this example is provided with a pair of left and right vertical pillars from the middle of the front and rear of a horizontal frame provided with wheels 26 at the rear end (the right end in FIG. 1 and the left end in FIG. 2). Further, the handle extends diagonally upward from the rear end, and the hopper 21 is supported by being sandwiched between the vertical columns. The ejector 22 is disposed at the lower end of the hopper 21, and the charging port at the lower end of the hopper is connected to the mixing port 223 (see FIG. 4 and subsequent figures) of the ejector 22. In addition, a plurality of reinforcing beams are bridged between the vertical column of the frame 25 and the handle, and the rigidity of the entire frame 25 is increased. A valve or the like constituting the emergency stop mechanism 1 is mounted between the vertical column and the handle.

  A bonnet 251 that pivots from the front to the top is pivotally attached to the vertical column of the frame 25. The bonnet 251 is formed by stretching a metal plate on a metal round pipe bent in a U-shape, and rotates between a closed posture projecting horizontally and an open posture springing up. The bonnet 251 is in an open posture, and the supply hose 24 placed in a notch provided in the stopper 252 provided in the horizontal frame is fitted to the output port 222 of the ejector 22 so that the bonnet 251 and the stopper 252 are in a closed posture. The supply hose 24 is sandwiched between the notch and the supply hose 24 is confined under the bonnet 251, so that the range in which the supply hose 24 detached from the ejector 22 is exposed is limited to the inside of the bonnet 251. This not only prevents the supply hose 24 from jumping away from the thermal spraying device 2, but also ensures that the supply hose 24 detached from the ejector 22 always contacts the elastic protrusion 134 and opens the hose detection valve 13 reliably. It is.

  The horizontal frame of the frame 25 is provided with a stopper 252 on the front side facing the output port 222 of the ejector 22, and the hose detection valve 13 so that the elastic projection 134 protrudes on the axis connecting the output port 222 and the stopper 252. (Shown in FIG. 1 to FIG. 3, FIG. 4, FIG. 6, FIG. 8 and FIG. 10 in a case containing the hose detection valve 13) is attached to the right side. As described above, the hose detection valve 13 sandwiches the supply hose 24 between the bonnet 251 and the notch of the stopper 252 and confines the supply hose 24 under the bonnet 251, and as described above, the output port By protruding the elastic protrusion 134 on the axis connecting 222 and the stopper 252, the supply hose 24 detached from the ejector 22 is always in contact with the elastic protrusion 134, and is supplied from the output port 222 of the ejector 22. When the hose 24 is detached, it is surely opened (the input port 131 and the output port 132 are communicated with each other, see FIG. 5).

  The supply hose 24 has a hook flange 241 that is a flat metal ring attached to the rear end (connection end). The engagement flange 241 has a function of preventing the supply hose 24 from flying far away by engaging with the stopper 252 of the frame 25 when the supply hose 24 is detached from the output port 222 of the ejector 22. The supply hose 24 only has a connection end fitted to the output port 222 so that it can be easily and reliably detached from the output port 222 when there is volume expansion or explosion due to flashback. For the same reason, the supply hose 24 may be merely fitted into the output port 222 of the ejector 22, or the connection end may be attracted to the output port 222 by a magnet.

  In this example, the supply hose 24 is directly connected to the output port 222 of the ejector 22. However, in order to ensure the strength against backfire, in fact, only a replacement hose is connected to the portion connected to the output port 222 of the ejector 22. Often used. In this case, only by attaching the engaging flange 241 to the replacement hose, the connection mode of the ejector 22 to the output port 222 is not changed, and the operation of the emergency stop mechanism 1 of the present invention is not changed.

  As shown in FIGS. 4 and 5, the emergency stop mechanism 1 is interposed in the oxygen supply line 23 (a line extending from the rightmost arrow representing “oxygen” in FIG. 4 to the input port 221 of the ejector 22). An emergency closing valve 11, an oxygen branch line 12 branched from the oxygen supply line 23, a hose detection valve 13 connected to the oxygen branch line 12, and a pressure line connecting the hose detection valve 13 and the emergency closure valve 11 14 and an oxygen exhaust valve 15 provided in the pressurization line 14 (in the broken line frame in FIGS. 4 and 5). The emergency stop mechanism 1 of this example visually indicates the oxygen pressurization state 16 so that the state where the pressurization line 14 is filled with oxygen and the emergency close valve 11 is closed can be visually recognized from the outside. Is provided in the pressure line 14. The indicator lamp 16 is configured to operate under the pressure of oxygen applied to the pilot port 161, and contributes to the emergency stop mechanism 1 of the present invention not using electrical components.

  The ejector 22 connects the inlet at the lower end of the hopper 21 for storing the sprayed material to the mixing port 223, the supply hose 24 to the output port 222, and the pipeline constituting the oxygen supply line 23 to the input port 221, respectively. As described, the connection of the supply hose 24 to the output port 222 is an external fit to the output port 222 of the ejector 22 so that it can be easily and reliably disconnected by volume expansion or explosion due to flashback. On the other hand, the connection of the hopper 21 to the mixing port 223 and the connection of the oxygen supply line 23 to the input port 221 are strong because they do not need to be disconnected during flashback. The oxygen supply line 23 is connected to a gas hose extending from the gas cylinder downstream from the branch adapter 231 via a flow meter 232 and a flow rate adjusting valve 233, and an emergency closing valve 11 is interposed between the oxygen supply line 23 and a pipe line extending from the emergency closing valve 11 Is connected to the input port 221 of the ejector 22.

  The emergency closing valve 11 has a pipe extending from the flow regulating valve 233 to the input port 111, a pipe extending to the input port 221 of the ejector 22 to the output port 112, and a pressurizing line 14 for providing oxygen pressure to the pilot port 113. Are connected to each other, and the pressure of oxygen flowing into the pressurizing line 14 is received by the pilot port 113 to switch the communication between the input port 111 and the output port 112 and shut off. In the block diagram (see FIG. 5), the emergency closing valve 11 is illustrated as a symbol for moving the switching block. However, in addition to the switching block, the emergency closing valve 11 may be configured by a valve body that switches between communication and cutoff by, for example, opening and closing.

  In the emergency closing valve 11 of this example, by energizing the switching block or the valve body, the communication side of the switching block is interposed between the input port 111 and the output port 112 as normal, or the valve body is opened to communicate (FIG. 5). Then, when the pilot port 113 receives the pressure of oxygen flowing into the pressurizing line 14, the emergency closing valve 11 is moved to the input port 111 and the output port by moving the switching block or moving the valve body against the bias. The switching block blocking side is interposed between 112 or the valve body is closed to block (see FIG. 7).

  As long as oxygen is confined in the pressurization line 14, the emergency closing valve 11 continues to receive the pressure of the oxygen from the pilot port 113 and keeps the input port 111 and the output port 112 disconnected. The blocked input port 111 and output port 112 exhaust oxygen from the pressurization line 14 through an oxygen exhaust valve 15 to be described later, eliminate the pressure on the pilot port 113, and re-energize the communication side of the switching block. It is made to communicate by interposing or opening a valve body.

  The hose detection valve 13 connects the pipe of the oxygen branch line 12 separated from the branch adapter 231 to the input port 131 and the pipe of the pressurization line 14 to the output port 132, and projects to the front of the output port 222 of the ejector 22. This is a two-port switching valve that switches between communication and disconnection of the input port 131 and the output port 132 by bringing the supply hose 24 removed from the output port 222 into contact with the elastic protrusion 134 that has been made. The hose detection valve 13 is shown as a symbol for moving the switching block in the block diagram (see FIG. 5), but may be constituted by a valve body that switches between communication and blocking by opening and closing, for example.

  The hose detection valve 13 of this example has a structure in which the valve body is built in a case in which the advance / retreat protrusion 135 protrudes when the elastic protrusion 134 is elastically deformed, and the pilot protrusion 133 provided in the valve body is pushed by the advance / retreat protrusion 135. (FIG. 5 and FIG. 7 comparative control). The elastic protrusion 134 is elastically deformed in either direction as long as the supply hose 24 or the engaging flange 241 comes into contact. From this point, when the supply hose 24 is disconnected from the output port 222 of the ejector 22, the elastic protrusion 134 is surely elastically deformed and the pilot protrusion 133 is pushed.

  In this example, the hose detection valve 13 energizes the switching block or the valve body so that the switching block blocking side is interposed between the input port 131 and the output port 132 as normal, or the valve body is closed to block the valve body. (See FIG. 5). Then, as described above, when the supply hose 24 or the engaging flange 241 comes into contact and the elastic protrusion 134 is elastically deformed, the pilot protrusion 133 is pushed by the protruding forward / backward protrusion 135 to move the switching block against the biasing force. By causing the valve body to move or move, the hose detection valve 13 causes the communication side of the switching block to intervene between the input port 131 and the output port 132 or opens the valve body to communicate (see FIG. 7).

  However, the time during which the elastic protrusion 134 is elastically deformed is an extremely short time during which the supply hose 24 or the engaging flange 241 contacts. For this reason, when the supply hose 24 or the engaging flange 241 is separated and the elastic protrusion 134 is restored to the original state, the forward / backward protrusion 135 is also retracted and the pilot protrusion 133 is not pushed, and the input port 131 and the output port 132 are attached again. It is blocked by intervening the blocking side of the switching block or closing the valve body. As a result, the pressurization line 14 can be confined without exhausting the oxygen flowing in, and can continue to apply pressure to the pilot port 113 of the emergency closing valve 11 until it is exhausted from the oxygen exhaust valve 15.

  The oxygen exhaust valve 15 connects the pipeline of the pressurization line 14 to the input port 151 and opens the output port 152. When the operator pushes and displaces the pilot projection 153, the oxygen exhaust valve 15 is connected to the input port 151 and the output port 152. This is a two-port switching valve that switches between communication and blocking. Although the oxygen exhaust valve 15 is shown as a symbol for moving the switching block in the block diagram (see FIG. 5), it may be constituted by a valve body that switches between communication and blocking by opening and closing, for example.

  In this example, the oxygen exhaust valve 15 energizes the switching block or the valve body, so that the shut-off side of the switching block is interposed between the input port 151 and the output port 152 as normal, or the valve body is closed and shut off. (See FIG. 5). For example, the oxygen exhaust valve 15 is moved between the input port 151 and the output port 152 by moving the switching block or moving the valve body against the biasing force only while the operator pushes the pilot protrusion 153. The communication side of the switching block is interposed or the valve body is opened for communication (see FIG. 10). As a result, oxygen trapped in the pressurization line 14 is exhausted through the oxygen exhaust valve 15. As described above, the oxygen exhaust valve 15 only needs to be able to exhaust oxygen from the pressurization line 14, and therefore, a simple on-off valve or a detachable cap may be substituted.

  The indicator lamp 16 has a structure in which the colored protrusions 163 are housed in a transparent cover 162, and the colored protrusions 163 are normally biased in the housing direction so as not to protrude from the cover 162. When the colored projection 163 is pushed by receiving pressure at the pilot port 161, the colored projection 163 is projected to a position where it can be seen from the cover 162 (see FIG. 6). Then, when oxygen is exhausted from the pressurization line 14, there is no pressure to push the coloring protrusions 163, so that it is submerged to a position where it cannot be seen from the cover 162 according to the bias (see FIG. 4). The state where oxygen remains in the pressurization line 14 means a state where the emergency closing valve 11 is closed. From this, the indicator lamp 16 directly informs the outside whether or not oxygen remains in the pressurization line 14, but indirectly serves to inform the exterior of the open / close state of the emergency closing valve 16.

  Operation | movement of the emergency stop mechanism 1 of this example is demonstrated. As shown in FIGS. 4 and 5, the emergency stop mechanism 1 does not operate in a state where the thermal spraying device 2 supplies oxygen and the thermal spray material without any problem. Specifically, although oxygen is supplied from the branch adapter 23 to the hose detection valve 13 through the oxygen branch line 12, the hose detection valve 13 remains closed, so that oxygen does not flow into the pressurization line 14. The emergency closing valve 11 remains open. The fact that oxygen is not supplied to the pressurizing line 14 and that the emergency closing valve 11 is open are also confirmed from the fact that the colored protrusions 163 do not protrude from the cover 162 of the indicator lamp 16.

  When a backfire occurs and the supply hose 24 is disconnected from the output port 222 of the ejector 22, as shown in FIGS. 6 and 7, the supply hose 24 or the engaging flange 241 momentarily contacts the elastic protrusion 134 to be elastic. By deforming and immediately opening the hose detection valve 13 to allow oxygen to flow into the pressurization line 14, the emergency closing valve 11 is closed with almost no delay from the time when the supply hose 24 is disconnected from the output port 222 of the ejector 22. Thus, the supply of oxygen to the ejector 22 can be stopped immediately after the supply hose 24 is disconnected from the output port 222 of the ejector 22. Then, when the supply of oxygen to the ejector 22 is stopped, the suction of the sprayed material from the hopper 21 can also be stopped.

  All volume expansion or explosion due to flashback occurs in the bonnet 251, so there is little risk of significant damage to the outside. Then, the supply hose 24 detached from the output port 222 of the ejector 22 is stopped by engaging the engaging flange 241 with the stopper 252, so there is no possibility that the supply hose 24 greatly deviates from the thermal spraying device 2. In this way, when the supply hose 24 engages the engaging flange 241 with the stopper 252, the contact between the engaging flange 241 and the elastic protrusion 134 is lost, and as shown in FIGS. 8 and 9, the elastic protrusion 134. Returns to its original state and closes the hose detection valve 13 again. At this time, since the oxygen exhaust valve 15 is closed, oxygen that is not exhausted from anywhere is trapped in the pressurization line 14, the emergency closing valve 11 remains closed, and the indicator lamp 16 also looks into the colored protrusion 163 from the cover 162. Maintain the state.

  The recovery procedure is, for example, as follows. When the emergency stop mechanism 1 of the present invention separates the supply hose 24 from the ejector 22 using backfire, the supply of oxygen is immediately stopped, and the thermal spray sticks around or inside the output port 222 of the ejector 22. Although it is prevented, it is desirable to check the thermal spray for sticking during recovery. For this reason, as shown in FIGS. 10 and 11, the flow rate adjustment valve 233 is tightened to “fully closed” to stop the supply of oxygen through the oxygen supply line 23 (for the convenience of illustration, it flows upstream of the oxygen supply line 23). Although the arrow is turned off, strictly speaking, oxygen is supplied to the flow rate adjusting valve 233), and the ejector 22 is separated from the thermal spraying apparatus 2 and inspected. When sticking of the thermal spray is confirmed, it is scraped off as appropriate.

  After inspection of the ejector 22 and scraping of the sprayed body are completed, the ejector 22 is attached to the thermal spraying device 2 again, the supply hose 24 is connected to the output port 222, and then the pilot projection 153 is pushed to open the oxygen exhaust valve 15 and pressurize. The oxygen in the port 14 is evacuated and the emergency closing valve 11 is opened again. At this stage, oxygen can be supplied through the oxygen supply line 23. However, since the flow rate adjustment valve 233 is still “fully closed”, oxygen is not supplied to the ejector 22. Then, after confirming that the sprayed material can be supplied from the hopper 21 to the mixing port 223 of the ejector 22, the flow rate adjusting valve 233 is opened, and the supply amount is gradually increased to shift to a steady state. Thus, oxygen and thermal spray material can be mixed and supplied through the supply hose 24.

1 Emergency stop mechanism
11 Emergency closing valve
12 Oxygen branch line
13 Hose detection valve
14 Pressure line
15 Oxygen exhaust valve
16 Indicator light 2 Thermal spray device
21 Hopper
22 Ejector
23 Oxygen supply line
24 Supply hose
25 frames
26 wheels

Claims (2)

A hopper for storing sprayed material is connected to the mixing port of the ejector, a supply hose is connected to the output port of the ejector, and an oxygen supply line is connected to the input port of the ejector. In a thermal spraying apparatus that mixes the thermal spray material from the ejector and supplies the thermal spray material and oxygen to the lance in a mixed state through the supply hose from the ejector,
An emergency closing valve interposed in the oxygen supply line;
An oxygen branch line branched from the oxygen supply line;
A hose detection valve connected to the oxygen branch line;
The pressurization line connecting the hose detection valve and the emergency closing valve, and an oxygen exhaust valve provided in the pressurization line constitute an emergency stop mechanism,
The emergency closing valve
The oxygen supply line is connected to the input port, the ejector input port is connected to the output port, and the pressurization line is connected to the pilot port. The oxygen pressure of the pressurization line is received by the pilot port and the communication between the input port and the output port is established. A switching valve that switches between shut-off and
The hose detection valve
Connect the oxygen branch line to the input port and the pressurization line to the output port, project the pilot projection in front of the output port of the ejector, and contact the supply hose removed from the output port to displace the pilot projection. It is a switching valve that switches between communication and shutoff of the port and output port,
The oxygen exhaust valve
A switch that switches between connecting and disconnecting the input port and output port by connecting the pressure line to the input port, opening the output port, causing the operator to push out the pilot protrusion, and pressing the operator to displace the pilot protrusion. A thermal spraying device characterized by being a valve. The thermal spraying apparatus according to claim 1, wherein the pressurization line is provided with an indicator lamp that notifies the presence or absence of a pressurization state.

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