JP2017145436A - Frame spray apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a detection mechanism to a flame spray apparatus of which supply hose is removed from a discharge port of an ejector in a case of backfire, the mechanism detecting a removal of the supply hose and stopping a flame spray material and reaction gas.SOLUTION: In a flame spray apparatus in which a supply hose 2 is connected to a discharge port 11 of an ejector 1 fixed on an apparatus frame such that it is removed in a case of backfire, and a flame spray material TSM mixed in the ejector 1 and reaction gas of oxygen CA are supplied to a lance using the supply hose 2, an always-opening cut-off valve 3 is included in a gas supply route 5 connected to an input port 15 of the ejector 1, a detection switch 4, 4 receiving an air blast generated from the supply hose 2 removing from the discharge port 11 in a case of a backfire is arranged at a vicinity of the discharge port 11, and displaces a switch part 42 by receiving the air blast to switch operation/non-operation of the cut-off valve 3 for closing the valve.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a thermal spraying apparatus in which a supply hose is connected to an ejection port of an ejector fixed to an apparatus frame so as to be removed in the event of flashback, and the thermal spray material and reaction gas mixed by the ejector are supplied to the lance by the supply hose. About.

  The spraying device is a repair device that sprays the sprayed material onto the wall surface of the coke oven.For example, the spraying material and oxygen are mixed by an ejector using oxygen as a reaction gas as a carrier gas, and the sprayed material and oxygen are supplied from the lance through the supply hose from the ejector. Inject as one. For this reason, the thermal spray material may ignite at the lance injection port, and a “backfire” may occur in which the fire goes back to the thermal spraying device through the supply hose. According to Patent Document 1, when the supply hose is disconnected from the discharge port (supply port) of the ejector during flashback, the hooking flange provided on the supply hose is engaged with the stopper provided on the apparatus frame to prevent the supply hose from bouncing around. A thermal spraying apparatus is disclosed (Patent Document 1 [Claim 1]).

  The thermal spraying device disclosed in Patent Document 1 has a limit switch disposed between the discharge port and the stopper, and the limit switch that is in contact with the hooking flange of the supply hose removed from the discharge port of the ejector is a means for supplying sprayed material and oxygen A stop signal is transmitted to stop the supply of thermal spray material and oxygen from the ejector (Patent Document 1 [Claim 4]). The limit switch protrudes the switch part (pin) that switches between operation and non-operation near the latching flange of the supply hose connected to the discharge port so that the latching flange of the supply hose removed from the discharge port will surely touch. (Patent Document 1 [0022]). The limit switch also has a function of detecting backfire on the thermal spraying device side (Patent Document 1, [0032]).

JP 2011-149078

  When the supply hose is disconnected from the discharge port of the ejector due to flashback, a blast occurs from the disconnected supply hose toward the discharge port of the ejector. In the supply hose, since the center direction of the blast is not fixed, the trajectory moving away from the discharge port is not uniform, and there is a possibility that the hooking flange does not hit the limit switch well. Further, there is a possibility that the hooking flange of the supply hose hits the limit switch body and damages the limit switch itself. Thus, although the thermal spraying device disclosed in Patent Document 1 can stop supplying the sprayed material and the reactive gas (oxygen) during flashback, there is room for improvement in the reliability of the supply stop and the protection of the limit switch. Therefore, in order to improve the detection mechanism that stops the sprayed material and the reactive gas (oxygen) by detecting that the supply hose is disconnected from the discharge port in the thermal spraying device that removes the supply hose from the discharge port of the ejector during flashback. did.

  What was developed as a result of the study was that a supply hose was connected to the discharge port of the ejector fixed to the device frame so that it could be removed in the event of flashback, and the sprayed material and reaction gas mixed by the ejector were fed to the lance by the supply hose. In the spraying apparatus to be supplied, the gas supply path connected to the input port of the ejector is provided with a shut-off valve which is always open, and the detection switch for receiving the blast generated from the supply hose disconnected from the discharge port during flashback is provided. The thermal spraying apparatus is characterized in that a detection switch arranged near the outlet and displaced the switch part by receiving a blast winds the shutoff valve between operation and non-operation and closes it.

  A shut-off valve that is always open may be opened in an inactive state or open in an activated state. A shut-off valve that is opened in an inactive state operates by receiving an activation signal directly from the detection switch or indirectly by receiving an activation signal from the valve controller to which the detection signal of the detection switch is sent. , Close. The shut-off valve that is opened in the operating state is deactivated by receiving a stop signal directly from the detection switch or indirectly by receiving a stop signal from the valve control unit to which the detection signal of the detection switch is sent. , Close.

  The thermal spraying apparatus of the present invention does not apply a supply hose (or a hook flange or the like provided on the supply hose) that comes off the ejector outlet in the event of flashback to the detection switch but occurs from a supply hose that comes off the ejector outlet. A detection switch that displaces the switch portion in response to the blast switches between the operation and non-operation of the shut-off valve. The displacement of the switch part includes movement in the direction in which the blast spreads, movement and tilting perpendicular to the direction in which the blast spreads. When the switch part is displaced, the detection switch sends an operation signal or a stop signal to the cutoff valve, or sends a detection signal to the valve control part, and the valve control part sends an operation signal or a stop signal to the cutoff valve. The shut-off valve is closed by switching between operation and non-operation in response to an operation signal or a stop signal.

  In the detection switch, the switch body is fixed in the vicinity of the discharge port of the ejector, and a switch part that is displaced by receiving the pressure of the blast is exposed to the range covered by the blast. From the viewpoint of protecting the switch body from the blast, it is preferable that the position of the switch body is fixed within the range where the blast does not reach, and only the switch part is exposed within the range where the blast reaches. Specifically, the switch body is fixed to the device frame. Fixing the detection switch to the device frame includes, for example, a case where the switch body is attached to the ejector and is indirectly fixed to the device frame via the ejector.

  The detection switch can be displaced by directly applying a blast to the switch portion. However, in order to reliably displace the switch part in response to the blast, the detection switch connects the wind receiving part that is displaced by the blast to the switch part, and the switch part is displaced in conjunction with the displacement of the wind receiving part. It is good to let them. The wind receiving portion is a plate or block having a plane or curved surface that intersects (preferably orthogonally) the direction in which the blast comes, and is reliably displaced by receiving the blast on the plane or curved surface. The displacement of the wind receiving part includes movement in the direction in which the blast spreads, movement perpendicular to the direction in which the blast spreads, and tilting. Thereby, the switch part connected to the wind receiving part is reliably displaced in conjunction with the wind receiving part.

  When the detection switch is configured to send out a pressure signal as an operation signal, a stop signal, or a detection signal when the switch portion is displaced in response to a blast, a power source is not required for outputting the operation signal, the stop signal, or the detection signal. The pressure signal is a pressure fluctuation caused by an output or stop of a pressurized medium (for example, a reaction gas supplied by being branched from a gas supply path to the ejector) supplied from the outside. The detection switch does not normally output a pressure signal, and outputs a pressurized medium as a pressure signal when the switch part is displaced, or normally outputs the pressurized medium as a pressure signal while the switch part is displaced. The output of the pressure medium is stopped. The pressure signal is an operation signal or a stop signal when directly output to the shut-off valve, and a detection signal when output to the valve control unit of the shut-off valve.

  Here, if the output of the pressure signal from the detection switch is continuous, the pressure signal is directly sent to the shutoff valve as an operation signal or a stop signal, and the shutoff valve closing operation is completed by the continuous pressure signal. it can. However, a detection switch that outputs a pressure signal can usually output a pressure signal only at the moment when the switch portion is displaced, and cannot continue to output a pressure signal sufficient to close the shutoff valve. From now on, when using a detection switch that outputs a pressure signal, the detection switch causes the valve control unit of the shut-off valve to output a pressure signal as a detection signal, and a continuous pressure signal or electric signal is sent from the valve control unit to the shut-off valve. Thus, the shut-off valve may be closed.

  In addition, if the detection switch is configured to send an electrical signal as an operation signal, a stop signal, or a detection signal when the switch portion is displaced due to a blast, the wiring connecting the detection switch and the shutoff valve or the valve control unit can be freely made. There are advantages. The detection switch does not normally output an electrical signal and outputs the electrical signal when the switch portion is displaced, or the normal configuration outputs the electrical signal and stops the output of the electrical signal by switching the switch portion. It becomes. When the shut-off valve is opened / closed by an electric signal, the detection switch directly outputs the electric signal as an operation signal or a stop signal to the shut-off valve. When the shut-off valve is opened and closed by a pressure signal, the detection switch outputs an electric signal as a detection signal to the valve control unit of the shut-off valve, and outputs a pressure signal from the valve control unit to the shut-off valve.

  The discharge port may be provided with a detection switch that is partially surrounded by a shielding surface that intersects a specific radial direction in which the blast spreads and that receives the blast in the remaining circumferential direction that is not surrounded by the shielding surface. The shielding surface is a plane or curved surface that intersects (preferably orthogonally) a specific radial direction in which the blast spreads, and is formed of a plate or a block. The “radial direction” of the discharge port means a direction spreading around the discharge port in a plane orthogonal to the direction in which the sprayed material and the reactive gas are discharged, and the “circumferential direction” of the discharge port refers to the discharge port in the plane. This means the direction surrounding the ring. The shielding surface collects the blast that spreads from the supply hose in all radial directions in a specific radial direction around the discharge port. A detection switch is arrange | positioned in the specific radial direction of the discharge outlet where a blast is collected. In this case, the detection switch is preferably arranged so that the switch body is removed from a specific radial direction of the discharge port where the blast is gathered, and only the switch portion is exposed in the radial direction.

  In addition, the supply hose is provided with a hook flange near the connection end of the ejector discharge port so that the supply hose that generates the blast is not far from the discharge port of the ejector. It is good to provide the stopper engaged with the said latching flange. If the supply hose is not far from the discharge port, the blast is prevented from spreading around the discharge port of the ejector, and the pressure of the blast spreading in the circumferential direction does not decrease much. Thereby, it becomes easy to ensure the pressure of the blast sufficient to displace the switch part. Further, since the blast does not spread so much, the range where the blast does not reach widens, and it becomes easy to hide the detection switch (particularly the switch body) in the range where the blast does not reach.

  The thermal spraying apparatus of the present invention has an effect that the supply of the thermal spray material and the reactive gas can be stopped without fail, triggered by a blast caused by flashback. When the shutoff valve is closed, the thermal spraying device stops the supply of the reaction gas to the ejector through the gas supply path. When the supply of the reaction gas to the ejector is stopped, the ejector sucks the spray material from the hopper, mixes it with the reaction gas, and further stops the discharge from the discharge port. In the thermal spraying apparatus of the present invention, since the detection switch for stopping the supply of the sprayed material and the reactive gas receives the blast spreading from the supply hose and always displaces the switch portion, the supply of the sprayed material and the reactive gas can be stopped without fail. Have gained.

  The detection switch in which the wind receiving portion is connected to the switch portion ensures the displacement of the switch portion due to the blast. Moreover, since it is only necessary to expose only the wind receiving portion within the range where the blast is covered, the entire detection switch including the switch portion can be hidden from the range where the blast is covered. Thereby, the detection switch which connected the wind receiving part to the switch part does not have a possibility of damage by the blast, and the wind receiving part can receive the blast and can displace the switch part reliably. Thereby, the thermal spraying apparatus of this invention has acquired the effect which ensures supply stop of a thermal spray material and a reactive gas.

  The detection switch that outputs the pressure signal can eliminate the use of electricity around the discharge port. In addition, the detection switch that outputs the pressure signal has an advantage of suppressing the power consumption of the battery serving as the power source. The detection switch that outputs an electric signal has a high degree of freedom in the arrangement of the detection switch, and the wiring connecting to the shutoff valve or the valve control unit does not get in the way. In addition, for example, in the case of a detection switch using a piezoelectric element as a switch unit, a plane interposed between the switch unit and the discharge port is a wind receiving unit, and the switch unit is completely hidden from the discharge port by the wind receiving unit, A configuration that reliably prevents damage to the detection switch due to the blast can also be adopted.

  The thermal spraying apparatus of the present invention can displace the switch part reliably by converging the blast spreading from the supply hose to the switch part by closing a specific radial direction of the discharge port with a shielding surface. The shielding surface can direct the blast that occurs during backfire as well as the known bonnet or together with the bonnet so that the blast does not affect the operator. The combination of the supply hose latching flange and the device frame stopper limits the distance that the supply hose separates from the discharge port, strengthens the action of the blast on the detection switch located near the discharge port, and Or limit the range. Thereby, the effect of ensuring the displacement of the switch part of a detection switch, or making it easy to hide a detection switch in the range which a blast does not reach is acquired.

It is a block diagram showing the principal part of an example of the thermal spraying apparatus to which this invention is applied. It is a fragmentary top view showing the discharge outlet vicinity of the ejector of this example. It is a partial side view showing the discharge outlet vicinity of the ejector of this example. It is a block diagram showing the principal part of the another example 1 of the thermal spraying apparatus to which this invention is applied. It is a block diagram showing the principal part of the another example 2 of the thermal spraying apparatus to which this invention is applied. It is a block diagram showing the state from which the supply hose of this example removed from the discharge outlet of the ejector. It is a block diagram showing the principal part of the another example 3 of the thermal spraying apparatus to which this invention is applied. It is a block diagram showing the state from which the supply hose of the other example 3 removed from the discharge outlet of the ejector.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the present invention, for example, as shown in FIGS. 1 to 3, a supply hose 2 is connected to a discharge port 11 of an ejector 1 fixed to an apparatus frame (not shown) so as to be disconnected during flashback. 2 is applied to a thermal spraying apparatus that supplies a thermal spray material TSM mixed in the ejector 1 and oxygen (carrier gas) CA as a reactive gas to a lance (not shown). In the thermal spraying apparatus of this example, a shutoff valve 3 is interposed in a gas supply path 5 connected to the input port 15 of the ejector 1, and a pair of detection switches 4 and 4 are arranged with the discharge port 11 interposed therebetween.

  The ejector 1 is connected to a hose constituting the gas supply path 5 at the input port 15 at the rear end (left end in FIGS. 1 and 2), and the upper side (paper surface in FIG. 1) by oxygen CA supplied from the input port 15. The thermal spray material TSN is sucked from the hopper 14 disposed on the front side, and the thermal spray material TSM is supplied to the lance (not shown) through the supply hose 2 connected to the discharge port 11 together with the oxygen CA. The ejector 1 of this example includes a pair of upper and lower metal shielding plates 12 and 12 sandwiching the discharge port 11 and covers a wide upper area with a hood 13 made of a metal plate.

  The pair of upper and lower shielding plates 12 and 12 is a sheet metal member formed by bending one metal plate and connecting the two, and an opening provided in an intermediate plate connecting the two is fitted to the discharge port 11 of the ejector 1. Then, by fixing, the discharge ports 11 are arranged so as to be sandwiched in the vertical direction. The pair of upper and lower shielding plates 12 and 12 are inclined plates whose intervals are opened up and down from the discharge port 11 toward the front (the direction in which the oxygen CA and the thermal spray material TSM are discharged), and are substantially rectangular plates in plan view parallel to the horizontal direction. Surface. As a result, the blast from the supply hose 2 removed from the discharge port 11 is restricted from spreading up and down by the shielding plates 12 and 12, and spreads mainly in the left-right direction in the radial direction of the discharge port.

  The supply hose 2 is merely fitted around the discharge port 11 of the ejector 1 and is detached from the discharge port 11 by a blast generated during flashback. The supply hose 2 of this example is externally fitted to the discharge port 11 through a through hole 221 provided in a stopper 22 made of a metal plate fixed to an apparatus frame (not shown). Further, the supply hose 2 of the present example has an annular hooking flange 21 made of metal attached to an end portion closer to the discharge port 11 from the stopper 22. The engaging flange 21 has a larger outer diameter than the through hole 221 provided in the stopper 22. As a result, the supply hose 2 disconnected from the discharge port 11 during backfire causes the engagement flange 21 to engage the stopper 22 and the distance away from the discharge port 11 is limited.

  The left and right detection switches 4, 4 are composed of a switch main body 41 and a switch portion 42 protruding forward of the switch main body 41. In the switch 4 of this example, the switch body 41 is fixed to an apparatus frame (not shown) at a position reserved behind the intermediate plate connecting the shielding plates 12 and 12 (the direction in which the body of the ejector 1 extends from the discharge port 11). It is less affected by the blast. The switch unit 42 has a flap 421 attached to a lever extending forward. The flap 421 is a substantially square metal plate having a size including a pair of upper and lower shielding plates 12 and 12 and is arranged in an upright posture orthogonal to the left-right direction of the discharge port 11 where the blast from the supply hose 2 is restricted. The Thus, the blast blown to the left and right by being restricted by the shielding plate 12 causes the flaps 421 and 421 of the left and right detection switches 4 and 4 to move leftward (left side (upper side in FIG. 1) detection switch 4) or rightward (right side (figure 1). 1) The switch part 41 is pushed open to the detection switch 4) on the lower side, and the switch part 41 is operated.

  The gas supply path 5 for supplying oxygen CA to the ejector 1 is provided with a shutoff valve 3, a flow rate adjusting valve 51, a flow site 52, and a pressure regulator 53 in the order closer to the ejector 1. The shut-off valve 3 is normally opened in an inoperative state, and supplies oxygen CA to the ejector 1 through the gas supply path 5. The shut-off valve 3 of this example is activated when it receives an operation signal (air pressure signal) AS from the valve control unit 31 that has received a detection signal (air pressure signal) DAS from either of the left and right detection switches 4, 4. It closes and the supply of oxygen CA to the ejector 1 is stopped. The valve control unit 31 in this example is an air operated valve.

  The flow rate adjustment valve 51 adjusts the amount of oxygen CA supplied to the ejector 1 through the gas supply path 5 per unit time. The flow site 52 has a transparent window that allows the oxygen CA supplied to the ejector 1 through the gas supply path 5 to be visually recognized from the outside. The pressure regulator 53 adjusts the pressure of the oxygen CA supplied to the ejector 1 through the gas supply path 5. Further, the pressure regulator 53 of this example has a function of branching the oxygen CA to the valve control unit 31 and the detection switch 4. The oxygen CA branched to the valve control unit 31 and the detection switch 4 is used as the air pressure signal for the detection signal DAS and the operation signal AS. Thus, the thermal spraying apparatus of this example can close the shut-off valve 3 with only oxygen CA without using electricity.

  The shutoff valve 3 of this example is actuated by an actuating signal SA that is an air pressure signal and is closed. For this reason, it is necessary to continuously receive the operation signal SA until the closing operation is completed. When the switch unit 42 operates and receives the detection signal DAS instantaneously from the detection sensor 4, the valve control unit 31 continuously sends the oxygen CA branched from the pressure regulator 53 to the shutoff valve 3 as the operation signal SA. . From this, for example, as in the thermal spraying apparatus of another example 1 shown in FIG. 4, when the detection signal DAS is instantaneously received from the detection sensor 4, the oxygen CA branched from the pressure regulator 53 is continuously received and shut off. If the valve 3 is used, the valve control unit 31 can be omitted.

  Further, the thermal spraying apparatus of the present example uses oxygen CA branched from the pressure regulator 53 for the detection signal DAS and the operation signal AS of the valve control unit 31 and the detection switches 4 and 4. Since the amount of oxygen CA required for the detection signal DAS and the operation signal AS is limited, even if it is branched, there is little influence on the transfer of the thermal spray material TSM. However, when there is a restriction on the branching of the oxygen CA, it is used for the detection signal DAS and the operation signal AS of the valve control unit 31 and the detection switches 4 and 4 as in the thermal spraying apparatus of another example 2 shown in FIG. An operation medium OA may be prepared separately. In this case, the operation medium OA only needs to generate an air pressure signal that becomes the detection signal DAS and the operation signal AS, so it does not need to be oxygen, and uses various pressurization media that are conventionally known gases or liquids. it can.

  The process up to the stop of the carrier gas CA and the thermal spray material TSM during backfire in the thermal spraying apparatus of this example will be described. When a backfire occurs for some reason and an explosion extends from the lance (not shown) to the ejector 1 through the supply hose 2, as shown in FIG. 6, the supply hose 2 has a blast (see FIG. 6 (see a thick broken line in FIG. 6), the ejection port 11 of the ejector 1 is detached. The blast winds the latch flange 21 on the stopper 22 and restricts the distance the supply hose 2 moves away from the discharge port 11, so that the range in which the shielding plate 12 extends in the left-right direction is limited. And since the shielding board 12 restrict | limits the spreading | diffusion of the said blast to the up-down direction, a blast is divided into the left-right direction, and pushes the flap 421 of the detection switches 4 and 4 open.

  Since the blast generated from the supply hose 2 is not uniform, it is not known which flap 421 of the left and right detection switches 4 and 4 is pushed ahead. In the case of this example, the detection switch 4 on the left side (upper side in FIG. 6) where the flap 421 has been pushed open in advance sends an air pressure signal from the branched carrier gas CA to the valve control unit 31 as the detection signal DAS. . The detection signal DAS is also sent to the valve control unit 31 from the detection switch 4 on the right side (lower side in FIG. 6) with a delay, but the detection signal DAS that has been delayed is ignored. The detection signal DAS sent from the detection switch 4 is instantaneous and serves only as a switch for operating the valve control unit 31.

  The valve control unit 31 that has received the detection signal DAS from the detection switch 4 starts to send an air pressure signal from the branched carrier gas CA to the cutoff valve 3 as an operation signal AS. Unlike the detection switch 4, the valve control unit 31 continues to send the branched carrier gas CA to the shutoff valve 3 as an operation signal AS. As a result, the shutoff valve 3 is securely closed, and the supply of the carrier gas CA to the ejector 1 is stopped. When the supply of the carrier gas CA to the ejector 1 is stopped, the suction of the thermal spray material TSM from the hopper 14 is naturally stopped. Thus, the discharge of the oxygen and the spray material TSM as the transport gas CA from the ejector 1 is stopped by stopping the supply of the transport gas CA and stopping the suction of the spray material TSM.

  The shut-off mechanism in the thermal spraying apparatus of the present invention can be configured using a detection switch 4 that is operated by electricity. For example, as shown in FIG. 7, a thermal spraying apparatus (another example 3) using a switch 4 that emits a detection signal DES that is an electric signal can be exemplified. The valve control unit 32 of another example 3 is the same as the above example (see FIGS. 1 to 3) in that an operation signal SA that is an air pressure signal is sent to the cutoff valve 3. However, the valve control unit 32 of another example 3 receives the detection signal DES that is an electrical signal from the detection switch 4, moves the solenoid to open the valve, and sends the carrier gas CA branched from the pressure regulator 53 to the shutoff valve 3. The point is different from the above example.

  The left and right detection switches 4, 4 used in the third example are connected to a common power source 33. The power source 33 may be provided in each of the left and right detection switches 4 and 4. The power source 33 is normally fixed to a device frame (not shown), but the power cord may be extended and disposed outside the thermal spraying device. The detection switch 4 of another example 3 has the same installation location as the above example except that the detection signal DES is an electrical signal. The detection switch 4 of another example 3 controls the detection signal DES, which is an electrical signal, by opening the flap 421 provided in the switch unit 42 when a blast is generated from the supply hose 2 disconnected from the discharge port 11 during flashback. Send to part 32.

  The process up to the stop of the carrier gas CA and the thermal spray material TSM during backfire in the thermal spraying apparatus of the third example will be described. When a backfire occurs for some reason and an explosion extends from the lance (not shown) to the ejector 1 through the supply hose 2, as shown in FIG. 8, the supply hose 2 has a blast (see FIG. 6 (see a thick broken line in FIG. 6), the ejection port 11 of the ejector 1 is detached. The blast winds the latch flange 21 on the stopper 22 and restricts the distance the supply hose 2 moves away from the discharge port 11, so that the range in which the shielding plate 12 extends in the left-right direction is limited. And since the shielding board 12 restrict | limits the spreading | diffusion of the said blast to the up-down direction, a blast is divided into the left-right direction, and pushes the flap 421 of the detection switches 4 and 4 open.

  Since the blast generated from the supply hose 2 is not uniform, it is not known which flap 421 of the left and right detection switches 4 and 4 is pushed ahead. In the case of another example 3, the detection switch 4 on the left side (upper side in FIG. 8) where the flap 421 has been pushed open in advance sends an electric signal to the valve control unit 32 as a detection signal DES. The detection signal DES is also sent to the valve control unit 32 from the detection switch 4 on the right side (lower side in FIG. 6) with a delay, but the detection signal DES that has been delayed is ignored. The detection signal DES sent from the detection switch 4 is instantaneous and serves only as a switch for operating the valve control unit 32.

  Upon receiving the detection signal DES from the detection switch 4, the valve control unit 32 opens the valve by the action of a solenoid, and starts sending an air pressure signal from the branched carrier gas CA to the shutoff valve 3 as an operation signal AS. The valve control unit 32 continues to send the branched carrier gas CA to the shutoff valve 3 as the operation signal AS. As a result, the shutoff valve 3 is securely closed, and the supply of the carrier gas CA to the ejector 1 is stopped. When the supply of the carrier gas CA to the ejector 1 is stopped, the suction of the thermal spray material TSM from the hopper 14 is naturally stopped. Thus, the discharge of the oxygen and the spray material TSM as the transport gas CA from the ejector 1 is stopped by stopping the supply of the transport gas CA and stopping the suction of the spray material TSM.

1 Ejector
11 Discharge port
12 Shield plate
13 Bonnet
14 Hopper
15 Input port 2 Supply hose
21 Hook flange
22 Stopper
221 Through hole 3 Shut-off valve
31 Valve control unit
32 Valve control unit
33 Power supply 4 detection switch
41 Switch body
42 Switch section
421 Flap 5 Gas supply route
51 Flow adjustment valve
52 Flow site
53 Pressure regulator
CA oxygen
OA operation media
TSM spray material
DAS detection signal
DES detection signal
AS activation signal

Claims (6)

In a thermal spraying apparatus, a supply hose is connected to an ejection port of an ejector fixed to an apparatus frame so as to come off during a backfire, and a thermal spray material and a reaction gas mixed by the ejector are supplied to the lance by the supply hose.
A gas supply path connected to the input port of the ejector is provided with a shutoff valve that is always open, and a detection switch that receives a blast generated from a supply hose that is disconnected from the discharge port during flashback is arranged near the discharge port. ,
A thermal spraying apparatus characterized in that a detection switch that receives a blast wave and displaces a switch unit switches between shut-off valve operation and non-actuation to close it. The thermal spraying device according to claim 1, wherein the detection switch connects a wind receiving portion that is displaced by receiving a blast to the switch portion, and displaces the switch portion in conjunction with the displacement of the wind receiving portion. The thermal spraying device according to claim 1, wherein the detection switch sends a pressure signal as an operation signal, a stop signal, or a detection signal when the switch portion is displaced by receiving a blast. The thermal spraying device according to claim 1, wherein the detection switch sends an electric signal as an operation signal, a stop signal, or a detection signal when the switch portion is displaced by receiving a blast. The discharge port has a detection switch that receives a blast in the remaining circumferential direction that is partially surrounded by a shielding surface that intersects with a specific radial direction in which the blast spreads and is not surrounded by the shielding surface. 4. The thermal spraying apparatus according to any one of 4. The thermal spraying device according to any one of claims 1 to 5, wherein the supply hose is provided with a latching flange in the vicinity of a connection end with respect to the discharge port of the ejector, and a stopper that is engaged with the latching flange is provided on a device frame in front of the discharge port of the ejector. .

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