JP2017029904A - On-site spray type foaming machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-site spray type foaming machine capable of preventing the generation of low-quality foams and shortening the recovery time when restarting foam spray after temporary interruption.SOLUTION: An on-site spray type foaming machine 1 of this invention, which mixes a first fluid with a second fluid different from the first fluid to generate a foam for spraying on a construction site, comprises a first channel 23 that flows the first fluid, a second channel 13 that flows the second fluid, a first pump 25 that supplies the first fluid into the first channel 23, a second pump 15 that supplies the second fluid into the second channel 13, a first pressure gauge 27 that measures the pressure in the first channel 23, a second pressure gauge 17 that measures the pressure in the second channel 13, and a control unit 51 that automatically stops the first pump 25 and the second pump 15 when a difference in measurement value between the first pressure gauge 27 and the second pressure gauge 17 exceeds a predetermined threshold value.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an on-site blowing type foaming machine that sprays a foam generated at a construction site.

  2. Description of the Related Art An on-site blowing type foaming machine is known in which foams such as polyurethane foam are produced by mixing two fluids such as an isocyanate and a resin raw material and sprayed at a construction site (see, for example, Patent Document 1).

JP 62-16110 A

  In such a foaming machine, one of typical problems is that a spray gun that sprays the generated foam is clogged. When the spray gun is clogged, the foam formed by spraying in that state has the mixing ratio of the two fluids deviating from the proper value. The foam thus produced is inferior to the original heat insulation performance and physical performance. Therefore, it is necessary to redo the construction, and wastes raw materials and construction time.

  Further, when the clogging of the spray gun is left unattended, there is a possibility that a back flow occurs in the flow path for flowing fluid to the spray gun and clogging occurs in the flow path. In this case, it is necessary to cut the flow path to remove the clogging, and such a recovery operation is very complicated and takes a long time.

  As a device for coping with such problems, Patent Document 1 discloses an interlock device in a two-component mixed discharge device in which a pressure gauge with upper and lower limit contacts is provided in a metering pump that pumps two fluids into a flow path. Yes. This stops the pump when the pressure of one or both of the two fluids deviates from the set pressure. However, in the on-site blowing type foaming machine, the thickness of the foam to be formed differs depending on the construction object, and it is necessary to change the pressure in the flow path through which each fluid flows. For example, when forming a thin foam, it is necessary to set the pressure in each flow path to about 5.5 MPa, and when forming a thick foam, set the pressure in each flow path to about 11 MPa. There is a need. Therefore, in such an interlock device, in order to detect clogging of the spray gun, it has been necessary to readjust the upper limit value and the lower limit value for each construction target many times.

  Moreover, in the on-site blowing foam, the pump for supplying the fluid to be mixed into the flow path is usually heavy, and thus is installed away from the construction site. For this reason, the operator operating the spray gun at the construction site must first go to the pump located at a location away from the construction site and stop them in order to recover from the clogging of the spray gun. There is. And after cleaning the spray gun, it was necessary to adjust the pressure in each flow path and return to the construction site after setting the pumps in operation again. For this reason, it is necessary to perform work by two people or work while reciprocating alone, and there is a problem that it takes time for the recovery work.

  Accordingly, an object of the present invention is to prevent the generation of a low-quality foam by detecting clogging of the spray gun at an early stage, and to shorten the recovery time when the foam spraying is suspended and resumed. The object is to provide an on-site blowing type foaming machine.

  According to the first aspect of the present invention, an on-site blowing type foaming machine that mixes a first fluid and a second fluid different from the first fluid, generates a foam, and sprays the foam at a construction site. A first flow path for flowing the first fluid, a second flow path for flowing the second fluid, and a first for supplying the first fluid into the first flow path. A second pump for supplying the second fluid into the second flow path, a first pressure gauge for measuring the pressure in the first flow path, and the second flow A second pressure gauge that measures the pressure in the channel, and the difference between the measured values of the first pressure gauge and the second pressure gauge exceeds a predetermined threshold value, the first pump and the An on-site blowing type foaming machine is provided that includes a control device that automatically stops the second pump.

  That is, according to the first aspect of the present invention, when the difference between the measured values of the first pressure gauge and the second pressure gauge exceeds a predetermined threshold value, the control device turns on the first pump and the second pump. Stop automatically. Thereby, the clogging of the spray gun can be detected at an early stage, and the production of a low-quality foam can be prevented. As a result, waste of raw materials and construction time due to reworking can be suppressed.

  According to a second aspect of the present invention, the first flow path and the second flow path are each provided with a pressure reducing valve for reducing the pressure in the flow paths. A spray type foaming machine is provided.

  That is, in the invention of claim 2, the pressure in the flow path is opened by opening the pressure reducing valve attached to the flow path with the higher internal pressure of the first flow path and the second flow path. Can be reduced to equal the pressure in the other channel.

  According to invention of Claim 3, said 1st pump and said 2nd pump are installed in the position spaced apart from the said construction site, and an on-site blowing type foaming machine is further said said 1st from the said construction site. An on-site blowing type foaming machine according to claim 1 or 2, comprising a remote control device for operating one pump and the second pump.

  That is, in the invention of claim 3, the operator of the on-site blowing type foaming machine normally moves to the first pump installed at a location separated from the construction site and the control device provided at the second pump. Without doing so, the first pump and the second pump can be activated from the construction site by the remote control device. As a result, when working alone, the work efficiency is improved, or it is not necessary to secure further personnel for operating the operation panel of the control device for efficient work.

  According to invention of Claim 4, the said remote control apparatus is equipped with the pressure display part which displays the measured value of said 1st pressure gauge and said 2nd pressure gauge, The spot spraying of Claim 3 A mold foaming machine is provided.

  That is, in the invention of claim 4, when the pressure reducing valve attached to the flow path showing the higher pressure value is opened to reduce the pressure in the flow path, it moves from the construction site. Therefore, it is possible to specify the flow path in which the pressure is high, and to accurately adjust the pressure.

  According to invention of Claims 1-4, clogging of a spray gun can be detected at an early stage, and the production | generation of a low quality foam can be prevented. As a result, waste of raw materials and construction time due to reworking can be suppressed.

1 is a schematic view of an on-site blowing type foaming machine according to an embodiment of the present invention.

  From this, the on-site blowing type | mold foaming machine which concerns on embodiment of this invention is demonstrated, referring FIG. The on-site blowing type foaming machine 1 according to the present embodiment mixes a polyol and an isocyanate corresponding to a first fluid and a second fluid, respectively, to produce a polyurethane foam corresponding to a foam, and blows it at a construction site. It is a foaming machine that can be attached.

  The on-site blowing type foaming machine 1 includes an isocyanate tank 11 that contains isocyanate, an isocyanate pump 15 that supplies isocyanate from the isocyanate tank 11 to the isocyanate channel 13, and an isocyanate channel pressure that measures the pressure in the isocyanate channel 13. 17 in total. The on-site blowing type foaming machine 1 further includes a polyol tank 21 that contains a polyol, a polyol pump 25 that supplies the polyol from the polyol tank 21 to the polyol passage 23, and a polyol passage that measures the pressure in the polyol passage 23. A pressure gauge 27.

  The isocyanate pump 15 and the polyol pump 25 are, for example, double-acting plunger pumps, but any type of pump may be used as long as it can supply a fixed amount to the isocyanate flow path 13 and the polyol flow path 23, respectively. . In the present embodiment, the isocyanate pump 15 and the polyol pump 25 are controlled so as to operate and stop in conjunction with each other.

  The on-site blowing type foaming machine 1 according to the present embodiment is further provided with decompression valves 19 and 29 for reducing the pressure in the flow paths 13 and 23 in the isocyanate flow path 13 and the polyol flow path 23, respectively. ing. Here, the pressure reducing valves 19 and 29 are three-way valves. However, when the isocyanate flow path 13 or the polyol flow path 23 is depressurized, the flow path 13 is not removed from the flow paths 13 and 23 without removing a spray gun 31 described later. As long as the isocyanate or polyol can be extracted from 23, any valve may be used.

  In the present embodiment, the on-site blowing type foaming machine 1 further includes a spray gun 31 that sprays and foams urethane foam produced by mixing and stirring isocyanate and polyol to a desired location. In addition, before supplying isocyanate and polyol to the spray gun 31, in order to accelerate | stimulate these reactions, it is heated with the heater H provided in the isocyanate flow path 13 and the polyol flow path 23, respectively. In the present embodiment, the heater H heats the polyol and the isocyanate to 20 to 60 ° C, preferably 30 to 50 ° C.

  In this embodiment, the isocyanate flow path 13 and the polyol flow path 23 are extended from the isocyanate pump 15 and the polyol pump 25 to the construction site F so that the foam can be sprayed by the spray gun 31 at the construction site F. That is, the isocyanate pump 15 and the polyol pump 25 are installed at positions separated from the construction site F.

  The on-site blowing type foaming machine 1 according to the present embodiment promotes the reaction between isocyanate and polyol. In the present embodiment, a foaming agent tank 41 that contains a foaming agent that is carbon dioxide in a liquid state, and a foaming agent tank 41. And a foaming agent pump 45 for supplying the foaming agent to the foaming agent flow path 43. The foaming agent channel 43 is connected to the polyol channel 23 via the on-off valve 47, and a predetermined amount of the foaming agent can be passed through the polyol channel 23 by opening and closing the on-off valve 47. In order to further mix the blowing agent that has flowed into the polyol channel 23 with the polyol, a static mixer M is provided in the polyol channel 23 downstream of the junction J of the polyol channel 23 and the blowing agent channel 43. Yes. Carbon dioxide is mixed with a polyol in a liquid state (including a subcritical state and a supercritical state). The foaming agent tank 41 may be in a liquid state or a gaseous state. A cooling device may be provided in the flow path 43 to be liquefied.

  The in-situ blowing-type foaming machine 1 can further obtain the measured values of the isocyanate channel pressure gauge 17 and the polyol channel pressure gauge 27, and can operate and stop the isocyanate pump 15 and the polyol pump 25. A control device 51 that is electrically connected is provided. The control device 51 is provided with the isocyanate pump 15 and the polyol pump 25, and includes an operation panel (not shown) that can switch the isocyanate pump 15 and the polyol pump 25 between an operating state and a stopped state.

  In the present embodiment, the control device 51 is a PLC (programmable logic controller) including a CPU (microprocessor), a memory, an input port, an output port, and the like, and this performs an analog control circuit or mechanical control. It may be.

  The on-site blowing type foaming machine 1 according to the present embodiment can further remotely operate the isocyanate pump 15 and the polyol pump 25 from the construction site F via the control device 51 and communication means described later. An operating device 61 is provided.

  The remote operation device 61 is connected to the control device 51 by communication means as described below. The communication means is wired or wireless. Examples of wired communication means include LAN cables and optical fiber cables. Examples of wireless communication means include mobile phone communication standards, broadband mobile wireless access systems, and short-range wireless communication standards. These devices can be connected by attaching communication devices that can use the respective communication means to the control device 51 and the remote operation device 61.

  The mobile phone communication standards include PDC, GSM (registered trademark), cdmaOne, etc. as second generation mobile communication systems, W-CDMA, CDMA2000, HSPA, EV-DO, LTE, etc. as third generation mobile communication systems, LTE-Advanced etc. are mentioned as a generation mobile communication system. Examples of the broadband mobile radio access system include WiMAX (registered trademark), XGP, mobile WiMAX, WiMAX2, WiMAX2 +, AXGP, and the like. With these communication standards, the control device 51 and the remote control device 61 can be connected via the Internet.

  Furthermore, examples of the short-range wireless communication standard include ZigBee (registered trademark), Bluetooth (registered trademark), and wireless LAN. According to these communication standards, the control device 51 and the remote control device 61 can be connected directly or via a relay. When construction is performed in a building, it is preferable to place at least one repeater outside the building if the control device 51 is installed outside the building. Moreover, the power supply of a relay machine can be installed easily by using the power supply of a building.

  In these wireless communication means, if a mobile phone communication standard or a broadband mobile wireless access system is used, it is preferable that the connection is possible without worrying about the distance between the control device and the construction site.

  In these wireless communication means, if the short-range wireless communication standard is used, connection is possible without using the Internet, and it can be used even in an area where the mobile phone communication standard and the broadband mobile wireless access system cannot be used. . Among the short-range wireless communication standards, Zigbee (registered trademark) and wireless LAN that can encrypt communication and can communicate even in a large building via a relay device are preferable, and communication is performed. Therefore, a wireless LAN that can easily be obtained and easily constructed is more preferable.

  In addition, even if it is difficult to connect via a repeater if it is a wireless LAN, the communication device that can be tethered to the mobile phone communication standard or the communication device of a broadband mobile wireless access system that can be connected to a wireless LAN can It is also possible to connect through this.

  The remote operation device 61 is preferably a portable information terminal that can download and use a control application for inputting control information to the control device 51 through the communication means. By doing in this way, even when the foam scattered at the construction site adheres and the portable information terminal cannot be used, an alternative device can be easily prepared at low cost. As the portable information terminal, for example, a general-purpose portable information terminal such as a mobile phone, a smartphone, a portable media player, or a portable game machine can be used.

  Moreover, it is preferable that the input means of the remote operation device 61 is a touch panel. By directly touching and operating the screen of the remote operation device 61, it can be operated more intuitively and input errors can be reduced.

  Moreover, it is preferable that the remote operation device 61 can input voice. As a result, the operator of the on-site blowing type foaming machine 1 can operate the remote operation device 61 without looking at the screen during construction.

  In the present embodiment, the remote control device 61 further includes a pressure display unit (not shown) that displays measured values of the isocyanate channel pressure gauge 17 and the polyol channel pressure gauge 27. Here, the remote control device 61 acquires the measured values of the isocyanate channel pressure gauge 17 and the polyol channel pressure gauge 27 from the control device 51 via the communication means. However, the remote control device 61 may directly acquire the measurement values of the isocyanate channel pressure gauge 17 and the polyol channel pressure gauge 27 from these pressure gauges 17 and 27.

  From this, the operation | movement process of the on-site blowing type | mold foaming machine 1 which concerns on this embodiment is demonstrated.

  First, the isocyanate pump 15 and the polyol pump 25 are put into an operating state by operating the control panel of the control device 51 or by inputting to the remote control device 61. Thereby, the operator operates the spray gun 31 and starts spraying foam on the construction site F.

  The control device 51 monitors the measured values of the isocyanate channel pressure gauge 17 and the polyol channel pressure gauge 27 during the blowing of the foam, and when the difference between these measured values exceeds a predetermined threshold value, The isocyanate pump 15 and the polyol pump 25 are automatically stopped.

  When the isocyanate pump 15 and the polyol pump 25 are stopped, the operator shuts off the communication between the isocyanate flow path 13 and the polyol flow path 23 and the spray gun 31, and from these flow paths 13 and 23, Remove spray gun 31. And the inside of the spray gun 31 is wash | cleaned and the clogging of the spray gun 31 is eliminated. Note that the communication between the isocyanate flow path 13 and the polyol flow path 23 and the spray gun 31 is blocked by, for example, closing an on-off valve (not shown) provided in the vicinity of the spray gun 31 of each flow path 13, 23. Alternatively, a valve that can close the flow paths 13 and 23 to the pressure reducing valves 19 and 29 may be selected.

  Next, in this embodiment, referring to the pressure of the isocyanate channel 13 and the polyol channel 23 displayed on the pressure display part of the remote control device 61, the channel 13 having a higher pressure value is shown. , 23, the pressure reducing valves 19, 29 are opened. Thus, by extracting a part of the isocyanate or polyol from the flow paths 13 and 23, the pressure in the flow path is reduced to be equal to the pressure in the other flow path.

  Next, the decompression valves 19 and 29 opened earlier are closed, and the spray gun 31 is attached to the isocyanate flow path 13 and the polyol flow path 23 so as to communicate with the flow paths 13 and 23. And finally, in this embodiment, the remote control device 61 makes the isocyanate pump 15 and the polyol pump 25 operate from the construction site F, thereby restarting the blowing of foam at the construction site F.

  By repeating the above process until the foam blowing is completed, the foam can be sprayed to the construction site F as desired.

  In addition, the said threshold value of the difference of the measured value of the isocyanate channel pressure gauge 17 and the polyol channel pressure gauge 27 is normally set to 3-15 Mpa. If the threshold value is smaller than 3 MPa, the pumps 15 and 25 are frequently stopped due to pressure fluctuations in the flow paths 13 and 23 caused by causes other than the clogging of the spray gun 31, for example, the viscosity of the raw material. Further, if the threshold value is larger than 15 MPa, the pumps 15 and 25 do not stop until the clogging of the spray gun 31 worsens, and a low-quality foam is generated for a long time. Cleaning of the flow paths 13 and 23 becomes very complicated.

  In addition, when using, for example, Fusion CS (trademark) (made by Graco Co., Ltd.) for the spray gun 31, since the check gun 31 itself has a built-in check valve, the spray gun 31 is not easily clogged. The threshold value can be set to about 5 MPa. Thereby, it is possible to prevent the pumps 15 and 25 from stopping unexpectedly due to a cause other than the clogging of the slept gun 31 while preventing the spray gun 31 from clogging.

  In the case of the present embodiment, the threshold value is preferably set to about 10 MPa. In this embodiment, since the foaming agent is injected into the polyol passage 23 from the foaming agent passage 43 at a constant pressure, a pressure difference is generated between the isocyanate passage 13 and the polyol passage 23. This is to prevent the pumps 15 and 25 from stopping unexpectedly.

  From this, the effect of the on-site blowing type foaming machine 1 which concerns on this embodiment is demonstrated.

  (1) In the in-situ blowing type foaming machine 1 according to the present embodiment, when the measured values of the isocyanate channel pressure gauge 17 and the polyol channel pressure gauge 27 exceed a predetermined threshold, the control device 51 causes the isocyanate pump 15 and The polyol pump 25 is automatically stopped. Thereby, the clogging of the spray gun 31 can be detected at an early stage to prevent the generation of a low-quality foam. As a result, waste of raw materials and construction time due to reworking can be suppressed. Furthermore, the clogging of the spray gun 31 is allowed to stand, and a reverse flow is generated in the isocyanate flow path 13 and / or the polyol flow path 23, and it is possible to prevent clogging from occurring in the flow paths 13 and 23.

  (2) In this embodiment, the pressure reducing valves 19 and 29 are provided in the isocyanate flow path 13 and the polyol flow path 23, and the pressure reducing valves 19 and 29 attached to the flow paths 13 and 23 having a higher internal pressure. By releasing the pressure, the pressure in the flow path can be reduced to be equal to the pressure in the other flow path. Thereby, subsequent clogging of the spray gun 31 can be suppressed.

  (3) The on-site blowing type foaming machine 1 according to this embodiment includes a remote control device 61. In the present embodiment, when the isocyanate pump 15 and the polyol pump 25 are automatically stopped, the isocyanate pump 15 and the polyol pump 25 are brought into an operating state from the construction site F by operating the remote control device 61. And the foam spraying can be resumed. As a result, the operator can move the isocyanate pump 15 from the construction site F by the remote operation device 61 without moving to the control device 51 installed in the isocyanate pump 15 and the polyol pump 25 installed at a location separated from the construction site F. The pump 15 and the polyol pump 25 can be activated. As a result, when the operator is working alone, the recovery time when the foam blowing is suspended and resumed can be shortened, or the operation panel of the control device 51 can be used for efficient work. There is no need to secure additional personnel to operate.

  (4) In the present embodiment, the remote control device 61 further includes a pressure display unit that displays measured values of the isocyanate channel pressure gauge 17 and the polyol channel pressure gauge 27. Thus, as described above, when the pressure reducing valves 19 and 29 attached to the flow paths 13 and 23 having higher pressure values are opened to reduce the pressure in the flow paths, The flow path where the pressure is high can be identified without moving from the construction site F, and the pressure can be adjusted accurately.

  In addition, you may comprise an on-site blowing type | mold foaming machine combining the component of the said embodiment arbitrarily. That is, as long as the features and functions of the present invention can be realized, the present invention is not limited to the on-site blowing type foaming machine of the embodiment.

  For example, the on-site blowing type foaming machine 1 includes the remote operation device 61 in the present embodiment, but may not include the remote operation device. Even in this case, the control device 51 can detect clogging in the spray gun 31 at an early stage to prevent further clogging in the spray gun 31 and solve the problem of the present invention.

  In this embodiment, the pressure reducing valves 19 and 29 are provided in the isocyanate flow path 13 and the polyol flow path 23, but the pressure reducing valves 19 and 29 may not be provided. In this case, the spray gun 31 can be operated while the pumps 15 and 25 are stopped, and the internal pressures of both the flow passages 13 and 23 can be lowered to make these internal pressures uniform. However, depending on the type of the spray gun 31, one of polyol and isocyanate may flow backward to the flow path on the other side and the clogging of the spray gun may be worsened. More preferably, the pressure is reduced.

DESCRIPTION OF SYMBOLS 1 On-site blowing type foaming machine 13 Isocyanate flow path 15 Isocyanate pump 17 Isocyanate flow path pressure gauge 19 Pressure reducing valve 23 Polyol flow path 25 Polyol pump 27 Polyol flow path pressure gauge 29 Pressure reducing valve 31 Spray gun 51 Control device 61 Remote control device F Construction site

Claims (4)

An on-site blowing type foaming machine that mixes a first fluid and a second fluid different from the first fluid, generates a foam, and sprays at a construction site,
A first flow path for flowing the first fluid;
A second flow path for flowing the second fluid;
A first pump for supplying the first fluid into the first flow path;
A second pump for supplying the second fluid into the second flow path;
A first pressure gauge for measuring the pressure in the first flow path;
A second pressure gauge for measuring the pressure in the second flow path;
A control device for automatically stopping the first pump and the second pump when a difference between measured values of the first pressure gauge and the second pressure gauge exceeds a predetermined threshold; ,
Comprising
On-site blowing type foaming machine. Each of the first flow path and the second flow path is provided with a pressure reducing valve for reducing the pressure in these flow paths.
The on-site blowing type foaming machine according to claim 1. The first pump and the second pump are installed at positions separated from the construction site,
The on-site blowing type foaming machine further includes a remote control device for operating the first pump and the second pump from the construction site.
The on-site blowing type foaming machine according to claim 1 or 2. The remote control device includes a pressure display unit that displays measurement values of the first pressure gauge and the second pressure gauge.
The on-site blowing type foaming machine according to claim 3.

Images