JP4103001B2 - Hume smoke exhaust method and fume smoke exhaust system - Google Patents

Description

  The present invention relates to a fume exhaust method and a fume exhaust system for exhausting fumes in a booth where a welding apparatus is installed to the outside of the booth.

  In arc welding, a large amount of fumes (smoke containing fine metal powder) is generated at the time of welding, so it is necessary to take sufficient measures to prevent the worker from sucking harmful fumes. For example, in Patent Document 1, a vortex is formed by sucking toward the curved wall while blowing toward the vicinity of the operator's head located on the front surface of the curved wall, and blown so as to merge with the vortex. A local exhaust device that exhausts by sucking contaminated air is described. However, the local exhaust device attracts the fumes to the eddy current formed in the vicinity of the operator's head, and therefore cannot efficiently capture the fumes floating near the fume generation source, that is, near the operator's mouth. Therefore, it is necessary for the local exhaust device to enhance the effect of attracting the fumes floating near the fume generation source by blowing a large air volume. In this case, in order to prevent fume leakage from the inside of the peripheral wall surrounding the fume generating source, a suction force (exhaust air volume) corresponding to the air flow rate is required. As a result, both the blast volume and the exhaust volume increase, and the duct becomes larger, so that the entire facility becomes larger and the facility cost increases. Moreover, since both the air flow rate and the exhaust air flow rate are increased, noise is increased and the working environment is deteriorated. Furthermore, since the local exhaust device blows air toward the vicinity of the operator's head, the operator receives a large amount of air blown to the head, increasing the burden on the operator's body.

  In general, when a welding robot is installed in a booth, air is generated in the booth by sucking the air in the booth by the smoke pulling unit while blowing into the booth by the smoke exhaust push unit, Inspires Hume to smoke outside the booth. In such a fume flue gas system, as a countermeasure against heat in the booth, for example, when an operator takes out a welded product (product) in the booth, the temperature is adjusted by an air conditioner (hereinafter referred to as adjusted air). ) From behind the worker into the booth. However, in the conventional fume exhaust system, the fumes are effectively exhausted when the smoke exhaust airflow in the booth is a laminar flow rate of 0.2 to 0.8 m / s (actual value of one booth). However, since the regulated air for ventilating the booth using the draft effect is a turbulent flow with a flow velocity of 1.5 to 2.0 m / s, the air flow of the regulated air interferes with the smoke exhaust airflow. The smoke exhaust airflow is disturbed and the fumes are prevented from being smoked. Therefore, it is conceivable that the air whose temperature is adjusted by the air conditioner is directly taken into the smoke exhaust push unit of the conventional fumes exhaust system, but until the flow velocity of the airflow formed in the booth reaches the speed at which the draft effect can be obtained. When the air flow rate of the push unit is increased, the atmosphere of the shield gas is disturbed during welding, resulting in poor welding such as blow holes. Furthermore, since the direction of the airflow formed in the booth is changed by the temperature of the regulated air, a steady flow cannot be formed in the booth.

JP 2000-153363 A (paragraph numbers 0008 to 0025, FIGS. 1 and 2)

  Therefore, the present invention has been made in view of the above circumstances, and a first object thereof is to provide a fume exhaust method in which both the fumes exhaust and the heat countermeasures in the booth are effectively performed. is there. A second object is to provide a fume flue gas system that effectively performs both fume flue gas and measures against heat in the booth.

In order to achieve the first object, the invention according to claim 1 of the present invention, while blowing toward the air temperature is adjusted from the push unit to fume source in the booth, the pull unit This is a fume exhaust method that sucks air in the booth to form an air flow in the booth, attracts fumes to the air flow formed in the booth, and exhausts the fumes outside the booth. It is characterized in that the amount of air to be blown is increased as compared to the time of welding .
According to a second aspect of the present invention, in the first aspect of the present invention, the blowing direction of the air blown into the booth is adjusted according to the temperature of the air blown into the booth.
In order to achieve the second object described above, the invention according to claim 3 of the present invention, while blowing air whose temperature is adjusted by the air conditioner from the push unit toward the fume generation source in the booth, A fume exhaust system that sucks air inside a booth by a pull unit to form an air flow in the booth, attracts fumes to the air flow formed in the booth, and exhausts the smoke outside the booth. Blowing amount adjusting means for adjusting the amount of air blown into the booth, a blowing direction adjusting means for adjusting the blowing direction of air blown from the push unit into the booth, and blowing into the booth during setup And a control means for controlling the air flow rate adjusting means so as to increase the air flow rate of the air to be increased compared to the welding time .
According to a fourth aspect of the present invention, in the third aspect of the present invention, the air flow rate adjusting means changes the opening degree of the damper provided between the air conditioner and the push unit to move from the push unit into the booth. It is characterized by adjusting the amount of air blown.
The invention described in claim 5 is the invention described in claim 3 or 4, further comprising a blowing amount detecting means for detecting the blowing amount of air blown from the push unit into the booth, and the control means is configured to send and controlling the air volume adjusting means based on a detection result of the air volume detecting means.
The invention according to claim 6 is the invention according to any one of claims 3 to 5, wherein the control means controls the blowing direction adjusting means according to the temperature of the air blown from the push unit into the booth. It is characterized by.

Therefore, in the invention according to the first aspect, depending on the situation, it is possible to selectively use an air flow rate suitable for fume flue gas and an air flow rate suitable for heat countermeasures.
According to the second aspect of the present invention, a steady air flow can be formed in the booth regardless of the temperature of the air blown from the push unit into the booth.
In the invention described in claim 3, the air temperature control by the air conditioner, the temperature by blowing amount adjusting means is adjusted, and is blown from the push unit into the booth. The control means controls the air volume adjusting means so as to ventilate the booth.
In the invention according to claim 4, the amount of air blown from the push unit into the booth is adjusted by changing the opening degree of the damper provided between the air conditioner and the push unit.
In the invention according to claim 5, the air flow rate of the air blown from the push unit into the booth is detected by the air flow rate detecting means, and the air flow rate adjusting means is controlled by the control means based on the detection result of the air flow rate detecting means. Is controlled.
In the invention described in claim 6, the control means controls the blowing direction adjusting means in accordance with the temperature of the air blown from the push unit into the booth, thereby adjusting the blowing direction of the air blown into the booth. The

  It is possible to provide a fume smoke exhaust method and a fume smoke exhaust system in which both the fumes exhaust and the heat countermeasures in the booth are effectively performed.

  An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the fume flue gas system is configured to draw air in the welding booth 2 by the pull unit 4 while blowing air toward the fume generation source 3 in the welding booth 2 by the push unit 1. An air flow F is formed in the welding booth 2, and fumes are attracted to the air flow F formed in the welding booth 2 so that fumes generated in the fume generation source 3 are exhausted to the outside of the welding booth 2. . The welding booth 2 is provided with a welding robot 5 in which a multi-joint robot grips a welding torch, and a work (material to be welded) is placed in front of the welding robot 5 (on the left side of the welding robot 5 in FIG. 1 as viewed in the drawing). A work table 6 on which is set is installed. In addition, as shown in FIG. 2, a work window 7 that can be opened and closed is provided in front of the welding booth 2 (the left surface in FIG. 1), and the worker can be opened with the work window 7 open. Thus, the workpiece is structured to be attached to and detached from the workpiece table 6.

  As shown in FIG. 1, this fume exhaust system has a push unit 1 installed in the upper front portion of the welding booth 2 so that the working window is above the fume generation source 3 and directly above the fume generation source 3. The air whose temperature is adjusted by the air conditioner 9 is blown from the outlet 8 of the push unit 1 arranged on the 7 side toward the fume generating source 3. Further, in the fume exhaust system, the pull unit 4 is installed on the back of the welding booth 2 (the surface on the right side in the drawing in FIG. 1), and the fume from the outlet 8 of the push unit 1 enters the welding booth 2. A substantially U-shaped airflow F of a flow descending toward the generation source 3 and turning in the vicinity of the fume generation source 3 and proceeding diagonally upward to the right in FIG. 1 is formed. As a result, the fumes generated by the fume generating source 3 are attracted by the air flow F formed in the welding booth 2, travel in the direction away from the work window 7, and are sucked by the pull unit 4. And this fume flue gas system has the structure where the dust contained in the fume attracted | sucked by the pull unit 4 with the dust removal apparatus is capture | acquired, and the purified air is exhausted outdoors.

  In addition, as shown in FIG. 1, in the present fume smoke removal system, a damper 11 (air blowing amount adjusting means) is provided in a blower passage 10 that connects the push unit 1 and the air conditioner 9. Is changed to adjust the amount of air blown from the outlet 8 of the push unit 1 into the welding booth 2. As a result, in the fume exhaust system, the air blown from the push unit 1 into the welding booth 2 so that a suitable airflow F is formed in the welding booth 2 toward the direction of exhausting the fumes during welding. The amount of air blown from the push unit 1 into the welding booth 2 is adjusted so that a draft effect can be obtained during setup. As shown in FIG. 3, in the present fume exhaust system, the damper 11 (air flow rate adjusting means) is electrically operated based on the control of a control device 12 (control means) constituted by a microcomputer. The structure is such that the opening degree is adjusted by being driven by the motor 13.

  Further, as shown in FIG. 3, this fume exhaust system has an air flow rate sensor 14 (air flow rate detection means) connected to the control device 12, and from the push unit 1 to the welding booth by the air flow rate sensor 14. 2 is detected. In the fume exhaust system, the control device 12 operates the electric motor 13 based on the detection signal of the air flow rate sensor 14 to change the opening degree of the damper 11 so that the push unit 1 and the welding booth 2 are changed. It has a structure in which the amount of air blown into the air is adjusted. Furthermore, as shown in FIG. 4, this fume exhaust system is provided with a movable fin 15 (air blowing direction adjusting means) at the outlet 8 of the push unit 1, and pushes by changing the angle of the movable fin 15. The blowing direction of the air blown from the unit 1 into the welding booth 2 is adjusted. And this fume flue gas system changes the angle of the movable fin 15 according to the temperature of the air temperature-controlled by the air conditioner, so that the blowing direction of the air blown from the push unit 1 into the welding booth 2 is changed. The structure is adjusted.

  As shown in FIG. 3, the fume flue gas system is connected to the control device 12 (control means) and the air conditioner 9, and the temperature data output from the air conditioner 9 (in the air conditioner 9). Temperature-adjusted air temperature data) is input to the control device 12 and processed. And this fume flue gas system has the structure where the angle of the movable fin 15 is adjusted when the control apparatus 12 operates the electric motor 16 according to the processing result of the said temperature data. Further, in the fume exhaust system, the electric motors 13 and 16 are cooperatively controlled by the control device 12, so that the air is blown according to the amount of air blown from the push unit 1 into the welding booth 2. The structure is adjusted in direction.

  Next, the operation of the present embodiment will be described. As shown in FIG. 1, in this fume exhaust system, air whose temperature is adjusted by the air conditioner 9 is blown from the outlet 8 of the push unit 1 toward the fume generation source 3 set on the work table 6. At the same time, the air in the welding booth 2 is sucked by the pull unit 4. Thereby, the substantially U-shaped airflow of the flow descending from the outlet 8 of the push unit 1 toward the fume generating source 3 and turning around the fume generating source 3 and proceeding diagonally upward to the right in FIG. F is formed in the welding booth 2. The fumes generated by the fume generating source 3 during welding are attracted by the air flow F formed in the welding booth 2, traveled away from the work window 7 and sucked into the pull unit 4. The contained dust is captured and the cleaned air is exhausted to the outdoors. In addition, at the time of welding shown in FIG. 1, the opening degree of the damper 11 (air flow rate adjusting means) is adjusted to the air flow rate at which the flow velocity of the air flow F is 0.2 to 0.8 m / s, and the flow rate shown in FIG. As described above, the angle of the movable fin 15 (air blowing direction adjusting means) is adjusted according to the temperature of the air blown into the welding booth 2 to adjust the air blowing direction of the air blown from the outlet 8 of the push unit 1. Is done.

  For example, when the temperature of the air blown into the welding booth 2 from the push unit 1 rises, the air flow F formed in the welding booth 2 is shifted to the ascending side, and as shown in FIG. The angle of the movable fin 15 is adjusted so that the air blowing direction of the air blown from the blowout port 8 of the push unit 1 is further downward, and the airflow F is secured. Further, when the temperature of the air blown from the push unit 1 into the welding booth 2 is lowered, the air flow F formed in the welding booth 2 is shifted to the lower side, so that the outlet 8 of the push unit 1 is discharged. The airflow F is secured by adjusting the angle of the movable fins 15 so that the air blowing direction of air is more upward. In this way, in the fume exhaust system, the air flow F is formed in the welding booth 2 regardless of the temperature of the air blown from the push unit 1 into the welding booth 2, so that the fumes are effectively turned into the welding booth 2. It is discharged outside. Further, the fume flue gas system has a structure in which the air flow from the air conditioner 9 (the air flow from the air conditioner 9 to the push unit 1) is changed from the push unit 1 during welding. The opening degree of the damper 11 is adjusted so that the amount of air blown into the welding booth 2 is constant, an air flow F is formed in the welding booth 2, and the fumes are effectively discharged out of the welding booth 2. The

  At the time of setup shown in FIG. 2, the opening degree of the damper 11 (air flow rate adjusting means) is adjusted to the air flow rate at which the flow velocity of the air flow F becomes 1.5 to 2.0 m / s, and the inside of the welding booth 2 The angle of the movable fin 15 (air blowing direction adjusting means) is corrected according to the amount of air blown to the air. As a result, as shown in FIG. 2, the airflow F flowing from directly above the worker toward the fume generation source 3 positioned in front of the worker is formed, and the fumes remaining in the welding booth 2 are removed from the worker. Be kept away. Moreover, the temperature of the air in the welding booth 2 heated at the time of welding is effectively performed by the draft effect, and the ventilation in the welding booth 2 is vented by the draft effect. Can be reduced.

This embodiment has the following effects.
In the fume exhaust system, the amount of air blown at a temperature adjusted by the air conditioner 9 changes the opening degree of a damper 11 (air blow amount adjusting means) provided between the air conditioner 9 and the push unit 1. Adjusted in Thereby, at the time of welding, air of a suitable blowing amount is blown from the push unit 1 into the welding booth 2 to exhaust the fumes, and at the time of setup, the inside of the welding booth 2 is effectively caused by the draft effect. Air that is ventilated can be blown from the push unit 1 into the welding booth 2, and it is possible to achieve both fume exhaust and thermal countermeasures for the welding booth 2. Furthermore, the air whose temperature has been adjusted by the air conditioner 9 is blown from the push unit 1 into the welding booth 2, so that the temperature rise in the welding booth 2 in the summer is suppressed, and the amount of blown air during setup is small. Compared to the conventional fume smoke exhaust system in which air whose temperature is adjusted by the air conditioner 9 is blown from behind the worker only during setup, the amount of air blown during setup is extremely small, reducing the burden on the worker. And the utility cost can be reduced.
In this fume flue gas system, since the air volume of the air blown from the push unit 1 into the welding booth 2 is detected by the air volume sensor 14 (air volume detector), the air is sent from the air conditioner 9 to the push unit 1. Even when the amount of air blown is reduced, it is possible to secure the necessary amount of air blown from the push unit 1 into the welding booth 2 by increasing the opening of the damper 11. become.
In this fume exhaust system, a movable fin 15 (air blowing direction adjusting means) is provided at the outlet 8 of the push unit 1, and the angle of the movable fin 15 is adjusted as necessary. Thereby, it becomes possible to adjust the blowing direction of the air blown from the push unit 1 into the welding booth 2 according to the temperature of the air blown into the welding booth 2 from the push unit 1. Accordingly, an air flow F that always passes through the fume generating source 3 is formed in the welding booth 2, and the fumes are effectively discharged regardless of the temperature of the air blown from the push unit 1 into the welding booth 2. Can be smoked.
In this fume exhaust system, the damper 11 (air blowing amount adjusting means) and the movable fin 15 (air blowing direction adjusting means) are cooperatively controlled by a control device 12 constituted by a microcomputer. Thereby, for example, at the time of setup, the opening degree of the damper 11 is increased so that the amount of air blown from the push unit 1 into the welding booth 2 is increased compared to that during welding, and the increased amount of blown air. Accordingly, the direction of the air blown from the push unit 1 into the welding booth 2 can be corrected by adjusting the angle of the movable fins 15, and the inside of the welding booth 2 can be effectively ventilated for measures against heat. It becomes possible.
In the fume exhaust system, air is blown from the push unit 1 into the welding booth 2 toward the fume generation source 3 located in front of the worker from directly above the worker during setup. Thereby, an air flow F is formed in the welding booth 2 so as to keep the remaining fumes away from the operator. As a result, the operator does not suck the fume without a dust mask and can be made maskless, and the running cost can be reduced.

In addition, embodiment is not limited above, For example, you may comprise as follows.
The air conditioner 9 and the control device 12 are connected, and the temperature of the air blown from the push unit 1 into the welding booth 2 by the control device 12 is recognized by the control device 12 based on a signal output from the air conditioner 9. However, for example, the temperature of the air blown from the push unit 1 into the welding booth 2 may be detected by a temperature sensor provided at the outlet 8 of the push unit 1. In this case, the air blown from the push unit 1 into the welding booth 2 is accurately grasped, and the movable fins 15 can be controlled more appropriately.
When the amount of air blown from the air conditioner 9 to the push unit 1 is constant, the damper 11 is switched between two stages of welding and setup by an actuator such as an air cylinder, for example, so that the fumes are discharged. A smoke system may be configured. In this case, the control by the control device is simplified, the equipment cost can be reduced, and the reliability of the system can be improved.
When the temperature of the air blown from the push unit 1 into the welding booth 2 by the air conditioner 9 is three stages of hot air, cold air, and air blow, a manual selector for switching the damper 11 is provided at each stage, and the fume A smoke exhaust system may be configured. In this case, the control by the control device is further simplified, the equipment cost can be reduced, and the reliability of the system can be improved.

It is explanatory drawing of this fume flue gas system, Comprising: The state at the time of welding is shown especially. It is explanatory drawing of this fume smoke removal system, Comprising: The state at the time of a setup is shown especially. It is a block diagram of this fume smoke removal system. It is explanatory drawing of this fume smoke removal system, Comprising: It is a figure for demonstrating control of a movable fin especially.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Push unit, 2 Welding booth, 4 Pull unit, 8 Air outlet, 9 Air conditioner, 11 Damper (air flow adjustment means), 12 Control device (control means), 14 Air flow sensor (air flow detection means), 15 Movable Fin (air flow direction adjusting means)

Claims (6)

While blowing air whose temperature has been adjusted toward a push unit to fume source of the booth, by sucking the air in the booth air flow is formed in the booth by pull unit, it is formed in the booth A fume exhaust method that attracts fumes to the airflow and exhausts the fumes outside the booth,
A fume smoke exhausting method characterized in that, during setup, the amount of air blown into the booth is increased as compared to welding . The fume exhaust method according to claim 1, wherein a blowing direction of air blown into the booth is adjusted according to a temperature of air blown into the booth. While the air whose temperature is adjusted by the air conditioner is blown from the push unit toward the fume generation source in the booth, the air in the booth is sucked by the pull unit to form an air flow in the booth. A fume exhaust system that attracts fumes to the air flow formed in the booth and exhausts the fumes outside the booth ,
Blowing amount adjusting means for adjusting the blowing amount of air blown from the push unit into the booth ;
A blowing direction adjusting means for adjusting a blowing direction of air blown from the push unit into the booth;
At the time of setup, control means for controlling the air flow rate adjusting means so as to increase the air flow rate of air blown into the booth than at the time of welding;
A fume exhaust system characterized by comprising: The blowing amount adjusting means, characterized in that adjusting the blowing amount of air blown into the booth from the push unit the opening of the damper is varied provided between the air conditioner and the push unit The fume exhaust system according to claim 3. It comprises a blowing amount detection means for detecting the blowing amount of air blown from the push unit into the booth ,
It said control means, fume flue gas system according to claim 3 or 4, wherein the controller controls the air volume adjusting means based on a detection result of the air volume detecting means. It said control means, fume flue gas system according to any one of claims 3-5, characterized in that for controlling the blowing direction adjusting means in accordance with the temperature of air blown into the booth from the push unit .

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