JP4536685B2 - Chemical concentration controller - Google Patents

Description

  The present invention relates to a chemical concentration adjusting device, and more particularly to a chemical concentration adjusting device for preparing a chemical solution to be replenished in a chemical impregnating device for impregnating wood with a chemical solution and adjusting the concentration of the chemical solution to be impregnated into wood. .

  Conventionally, in order to impregnate wood with chemicals such as preservatives, insecticides, flame retardants, etc., a process of pressurizing the chemical and press-fitting into the wood has been performed. For example, by storing wood in a sealable tank and introducing the chemical into the tank with a pressure pump, or after introducing sufficient chemical into the tank to immerse the wood, The interior of the wood is impregnated with a chemical solution by pumping a gas such as air into the space to increase the pressure of the chemical solution.

  In such a process, excess chemical liquid introduced into the tank from the chemical liquid storage tank and not impregnated with the wood in the tank is returned to the chemical liquid storage tank again and used for the processing of the next wood. It is often used repeatedly while replenishing new chemicals as appropriate.

  The above prior art is publicly implemented, and the applicant has not found a document describing this prior art at the time of filing this application.

  However, even if the chemical solution is initially prepared so that the concentration becomes a predetermined value, the concentration of the chemical solution may change, for example, the chemical solution may be diluted with moisture that exudes from the wood in the tank. Therefore, when the chemical solution is repeatedly used as described above, there is a problem that the change in concentration gradually increases and the quality of the treated wood is not constant. In addition, there is a problem that the concentration of the chemical solution actually impregnated in the wood is unknown.

  In addition, due to the concern that the concentration of the impregnated chemical solution will be lower than the desired concentration, the concentration of the chemical solution is often set high on site, and excessively high concentration chemical solution is used. As a result, there is a problem that the chemical solution is wasted.

  In addition, when the impregnation treatment is performed while measuring the concentration of the chemical solution as needed, there have been the following problems because a simple titration method is often used in the past. In other words, a simple titration method is to drop a medicinal solution to be measured in a container containing an indicator, check the end point by the color change of the indicator, and calculate the concentration from the amount of dripping of the medicinal solution until the end point is reached. The operation of dripping the chemical solution while confirming the color was troublesome and time consuming. In addition, there is a problem that errors are likely to occur at each stage of the dilution of the chemical solution, determination of the end point, and reading of the dropping amount, and accurate concentration measurement cannot be performed. In addition, there is a problem related to disposal of used reagents and containers that occur every titration.

  Furthermore, conventionally, a chemical solution is often prepared by measuring a stock solution or solvent of a chemical solution in a large container such as a bucket, and the actual concentration of the chemical solution deviates from a desired concentration from the initial stage of preparation. I was there.

  Accordingly, in view of the above circumstances, the present invention prepares a chemical solution to be replenished in a chemical solution impregnating apparatus for impregnating wood with a chemical solution, and maintains the concentration of the chemical solution impregnated in the wood while reducing a deviation from a predetermined value. Therefore, a first problem is to provide a chemical concentration adjusting apparatus capable of performing the above. Another object of the present invention is to provide a chemical concentration adjusting apparatus that can adjust the concentration of the chemical more accurately and easily.

  In order to solve the above-described problem, the chemical concentration adjusting apparatus according to the present invention is described as follows. “A chemical solution is introduced from a chemical solution storage tank into a container in which wood is stored, and the chemical solution is impregnated into wood, and an excess chemical solution is returned to the chemical solution storage tank. This is a chemical concentration controller that adjusts the concentration of chemicals to be impregnated into wood, and prepares the chemicals to be replenished in a chemical solution impregnation device that is used repeatedly. A raw material supply device, a meter for measuring the chemical raw material supplied to the preparation tank by the raw material supply device, a concentration detection device in the storage tank for detecting a concentration of the chemical liquid in the chemical storage tank, and a concentration in the storage tank Based on the detection by the detection device, the chemical solution is replenished so that the concentration of the chemical solution in the chemical solution storage tank becomes a predetermined value by replenishing the chemical solution storage tank with the predetermined amount from the preparation tank. Concentration of Set as the supplement chemical concentration, set the supply amount of the chemical raw material to be supplied to the preparation tank based on the supplement chemical concentration as the supply set amount, and control the raw material supply device based on the measurement of the meter And a chemical solution preparing means for supplying the supply amount of the chemical solution raw material to the preparation tank ”.

  The present invention introduces a chemical solution from a chemical solution storage tank into a container containing wood, impregnates the chemical solution into the wood, and then returns the excess chemical solution to the chemical solution storage tank for use in the processing of the next wood. Is a device for preparing a chemical solution to be replenished in a chemical solution impregnating device that repeatedly uses.

  The “chemical solution raw material” is used in the meaning including a stock solution of a drug, a solid drug such as powder and granules, a solvent, and a solution in which the drug is diluted with a solvent. The “preparation tank” is a tank in which the supplied chemical solution raw materials are mixed to obtain a chemical solution with a predetermined concentration, and may include a stirring device, a heating device, or a cooling device.

  The “raw material supply device” includes, for example, a raw material tank that stores chemical raw materials, a supply path that connects the raw material tank and the preparation tank, a valve that opens and closes the supply path, and a pump that sends the chemical raw material to the preparation tank via the supply path. It can be set as the equipped structure. Alternatively, when the raw material tank is provided above the preparation tank and the chemical solution raw material is allowed to flow naturally through the supply path, the pump can be omitted.

  The “meter” can be, for example, a mass meter that measures the mass of the chemical solution raw material supplied to the preparation tank together with the preparation tank. Or it can also be set as the flowmeter for liquids and granular materials provided in the supply path of each chemical | medical solution raw material.

  The “storage tank concentration detection device” can be constituted by, for example, a measuring instrument that measures the electrical conductivity or specific gravity of a chemical solution and a microprocessor that includes a program that converts the measured value into a concentration and outputs it. . Or it can also be comprised by the automatic titration apparatus which fractionates a small amount of chemical | medical solutions and performs titration.

  Based on the detected chemical concentration in the storage tank, the “chemical preparation means” replenishes a predetermined amount of the chemical liquid from the preparation tank so that the concentration in the chemical storage tank becomes a predetermined value. A program for calculating the concentration of the replenishing chemical solution, and a program for determining the amount to be supplied to the preparation tank for each chemical raw material as the set supply amount so that the concentration of the replenishing chemical solution prepared in the preparation tank becomes the calculated replenishing chemical concentration And a microprocessor having a program for controlling the supply of the chemical raw material by the supply setting device based on the output of the meter so that the determined supply set amount of the chemical raw material is supplied to the preparation tank. it can.

  Here, the “predetermined predetermined amount” of the chemical liquid can be, for example, an amount corresponding to the amount of the chemical liquid to be impregnated into the wood by the chemical liquid impregnation apparatus. A fixed value can be set in the program of the means. Alternatively, the amount of the chemical liquid impregnated in the wood in the immediately preceding process in the chemical liquid impregnation apparatus can be input to the chemical liquid preparation means by the operator. Further, the “predetermined predetermined value” of the concentration can be set according to a standard regarding the processing of wood and the like according to the type of chemical, the purpose of processing, the type of wood, and the like.

  Therefore, according to the present invention, even if the concentration of the chemical solution varies in the chemical solution impregnation apparatus, the concentration of the chemical solution in the chemical solution storage tank is measured and fed back to adjust the concentration of the newly replenished chemical solution. This makes it possible to maintain the concentration of the chemical liquid impregnated in the wood in the chemical liquid impregnation apparatus that has been replenished while reducing the deviation from a predetermined value.

  In addition to the above-described configuration, the chemical concentration adjusting apparatus according to the present invention may further comprise “a chemical amount detection device in the storage tank that detects the chemical amount in the chemical storage tank, and the chemical preparation unit may be configured to detect the chemical amount in the storage tank. Based on the detection by the detection device, the amount of the chemical solution to be replenished from the preparation tank to the chemical solution storage tank is set as a supplementary chemical amount, and the supply set amount is set based on the supplementary chemical amount and the concentration of the supplementary chemical solution. It can be.

  The “chemical amount detection device in the storage tank” is, for example, a level meter that monitors the liquid level height of the chemical storage tank, or a mass meter that measures the mass of the chemical liquid in the chemical storage tank together with the chemical storage tank, and the measured value is the chemical liquid It can be constituted by a microprocessor provided with a program for converting into a quantity and outputting it.

  Therefore, according to the present invention, the amount of the chemical solution to be replenished is appropriately set based on the amount of the chemical solution currently existing in the chemical solution storage tank, and the replenishment chemical concentration is determined based on the set amount of the replenishing chemical solution. Thus, the concentration of the chemical liquid impregnated into the wood in the chemical liquid impregnation apparatus can be controlled more precisely. For example, even if the amount of chemical liquid to be impregnated into wood in the chemical liquid impregnation device is different and the amount of chemical liquid to be replenished is different every time, automatic operation is not required without requiring the operator to input the chemical amount every time. Therefore, the amount of replenishing chemical solution is set. Further, even when the amount of chemical solution varies greatly due to factors other than the impregnation of wood, such as when a large amount of moisture exudes from wood, the amount of chemical solution to be replenished is always set appropriately.

  Furthermore, since both the concentration and the amount of the existing chemical solution in the chemical solution storage tank are considered, for example, when the concentration is low even if the amount of the solution is sufficient, the replenished chemical solution is changed to the stock solution or stock solution. By using a close concentrated chemical solution, the concentration can be increased without increasing the amount of the chemical solution impregnated in the wood.

  Furthermore, the chemical concentration adjusting apparatus according to the present invention is such that “an electrolyte solution is used for the chemical, and the concentration detecting means in the storage tank detects the concentration of the chemical based on the electrical conductivity of the chemical”. it can.

  Therefore, according to the present invention, the concentration can be detected more accurately and easily by the chemical detection device in the storage tank. For example, since the concentration of the chemical solution is small and the specific gravity is close to 1, even if the concentration of the chemical solution cannot be accurately detected depending on the specific gravity, it is possible to accurately detect the concentration of the chemical solution according to the electric conductivity. Become. In addition, the measurement of electrical conductivity is easy to automate because continuous measurement is possible simply by immersing the measurement terminal in the chemical solution. In addition, the concentration of the chemical solution can be detected extremely easily compared to an automatic titration apparatus that performs measurement by taking a chemical solution as needed.

  As described above, the first effect of the present invention is to prepare a chemical solution to be replenished in a chemical solution impregnating apparatus for impregnating wood with a chemical solution, and maintain the concentration of the chemical solution to be impregnated in the wood by reducing a deviation from a predetermined value. The chemical | medical solution concentration adjustment apparatus which can do can be provided. In addition, as a second effect, it is possible to provide a chemical concentration adjusting device that can adjust the concentration of the chemical more accurately and easily.

  Hereinafter, a chemical concentration adjusting apparatus which is the best embodiment of the present invention will be described with reference to FIGS. Here, the case where the chemical concentration adjusting device is applied as a configuration of the chemical impregnation device is illustrated. Here, FIG. 1 is an explanatory diagram showing the configuration of the chemical concentration adjusting apparatus and the chemical impregnating apparatus to which the apparatus is applied, and FIG. 2 is a functional diagram of the chemical impregnating apparatus and the chemical concentration adjusting apparatus of FIG. FIG. 3 is a flow chart showing the flow of processing in the chemical liquid impregnation apparatus of FIG. 1, and FIG. 4 is a flow chart showing the flow of processing in the chemical liquid concentration adjusting apparatus of this embodiment.

  First, the structure of the chemical | medical solution impregnation apparatus 1 to which the chemical | medical solution concentration adjustment apparatus 2 of this embodiment is applied is demonstrated. As shown in FIGS. 1 and 2, the chemical liquid impregnation apparatus 1 includes a sealable tank 10, a chemical liquid storage tank 20 that stores the chemical liquid, a pressure pump P <b> 2 that introduces the chemical liquid from the chemical liquid storage tank 20 to the tank 10, A pressure regulating valve 45 for regulating the pressure in the tank 10, a liquid level sensor 52 for detecting when the tank 10 containing wood is filled with the chemical liquid sent from the chemical liquid storage tank 20, and an introduction path from the chemical liquid storage tank 20 An introductory chemical amount detection device 51 that detects the amount of introduced chemical solution introduced into the tank 10 via 30 and an impregnating chemical amount control means 8 to be described later are provided.

Here, the tank 10 is a substantially cylindrical pressure-resistant container having a sufficient capacity to accommodate the wood to be processed, and has an internal volume of 16 m ^{3 in} this embodiment. In the vicinity of the maximum height of the space in the tank 10, a liquid level sensor 52 that operates the switch when the liquid level rises is attached. Further, a pressure gauge 53 and a leak valve 46 are attached to the tank 10, and a vacuum pump P 1 is connected via the valve 43 and the deaeration path 33. In addition, the cover part 11 for carrying in / out a timber is provided in the end of the tank 10. As shown in FIG.

Chemical storage tank 20 is a substantially rectangular parallelepiped container which is open upwardly, in part by one parallel to the compartment wall 25 of the side wall is partitioned, the contents of the first reservoir 21 and 4m ³ having an internal volume of 14m ³ It has the structure where the 2nd storage tank 22 which has a product was arranged in parallel. That is, the height of both tanks is substantially equal, the horizontal sectional area of the first storage tank 21 and the second storage tank 22 is 7: 2, and the horizontal sectional area of the second storage tank 22 is the first storage tank 21. It is considerably smaller than In addition, in order to supply the tank 10 with a chemical solution that can fill the tank 10 regardless of the volume of the wood, the volume of the second storage tank 22 is not less than the difference between the volumes of the tank 10 and the first storage tank 21. Is desirable.

  The first storage tank 21 is connected to the tank 10 via the main flow path 31 and the valve 41. Further, the second storage tank 22 is connected to the tank 10 via the introduction path 30 and the valve 42. In the present embodiment, the first storage tank 21 is installed almost directly below the tank 10, and the chemical solution in the tank 10 naturally flows into the first storage tank 21 when the valve 41 is opened.

  The pressure pump P <b> 2 is a spiral pump and is provided in the introduction path 30. Further, the pressure regulating valve 45 of the present embodiment is a constant pressure valve as a configuration of the pressurizing pump P2, and when the pressure on the tank 10 side of the introduction path 30 rises to a predetermined pressure or higher, the chemical liquid is supplied via the discharge path 35. Is returned to the second storage tank 22, and the pressure on the tank 10 side is maintained at 1.0 to 1.5 MPa. Furthermore, the introduced chemical liquid amount detection device 51 detects the amount of introduced chemical liquid based on a float-type liquid level meter 55 that measures the liquid level of the second storage tank 22 and the change in the measured liquid level. It is comprised by the introduction chemical | medical solution amount detection means 56 to do.

  Next, the configuration of the chemical concentration adjusting apparatus 2 of the present embodiment will be described. The chemical concentration adjusting apparatus 2 includes a preparation tank 28 in which a chemical solution for replenishment is prepared, a raw material supply apparatus 70 that supplies chemical raw materials to the preparation tank 28, and a chemical liquid raw material that is supplied to the preparation tank 28 by the raw material supply apparatus 70. A meter 63 for measuring, a concentration detecting device 62 for detecting the concentration of the chemical in the chemical storage tank 20, a chemical amount detecting device 61 for detecting the chemical amount in the chemical storing tank 20, and a chemical preparation means described later. 9. In this embodiment, three types of chemical solution stock solutions A, B, C and water as a solvent and water as a solvent are used as a chemical solution raw material, and these are mixed to prepare a chemical solution.

More specifically, the preparation tank 28 is a tank having a volume of 2 m ³ , and a load cell as a meter 63 is provided so as to place the preparation tank 28. In addition, the raw material supply apparatus 70 includes raw material tanks 71a, 71b, 71c, 71w for storing the A liquid, the B liquid, the C liquid, and the solvent, and the raw material tanks and the preparation tank 28 with valves 75a, 75b, 75c, respectively. Supply path 73a, 73b, 73c, 73w connected via 75w is comprised. In the present embodiment, the raw material tank 71a and the like are provided above the preparation tank 28, and the raw material is naturally supplied to the preparation tank 28 through the supply path 73a and the like when the valve 75a and the like are opened. However, it is also possible to provide a pump in the supply path to feed the raw material.

  The in-tank concentration detection device 62 includes an electric conductivity meter 67 for measuring the electric conductivity of the chemical solution and an in-tank concentration detecting means 68 for converting the measured electric conductivity into the chemical solution concentration. Is installed in the first storage tank 21. Moreover, the chemical | medical solution amount detection apparatus 61 in a storage tank measures the chemical | medical solution amount in the 2nd storage tank 22 based on the liquid level height meter 55 which measures the liquid level height of the 2nd storage tank 22, and the measured liquid level height. It is comprised by the chemical | medical solution amount detection means 66 in the storage tank to detect. That is, in the present embodiment, the introduced chemical solution amount detection device 51 of the chemical solution impregnation device 1 and the chemical solution amount detection device 61 in the storage tank of the chemical solution concentration adjustment device 2 share the liquid level height meter 52 as a configuration. The preparation tank 28 and the second storage tank 22 are connected via a replenishment path 38 and a valve 48, and a liquid feed pump P3 is provided in the replenishment path 38.

  Next, a functional configuration in the present embodiment will be described with reference to FIG. The functional configuration of the chemical liquid impregnation apparatus 1 mainly includes the introduced chemical liquid amount detection means 56 and the impregnation chemical liquid amount control means 8 described above. Here, based on the detection by the liquid level sensor 52 and the detection by the introduced chemical liquid amount detection device 51, the impregnating chemical liquid amount control means 8 sets the chemical liquid amount impregnated in the wood based on the introduced chemical liquid amount after the filling as the impregnating chemical liquid amount. Based on the detection of the impregnating chemical amount detection means 81 to be detected, the detection of the liquid level sensor 52, and the detection by the introduction chemical amount detection device 51, the introduction from the chemical solution storage tank 20 to the tank 10 to the time of filling is started. A wood volume detecting means 82 for detecting the volume of the wood from the amount of the chemical liquid and the volume of the tank 10; an impregnating chemical liquid amount setting means 85 for setting the amount of the chemical liquid to be impregnated into the wood based on the wood volume; When the amount of the chemical liquid is monitored and the impregnated chemical liquid amount set value is reached, the introduction of the chemical liquid into the tank 10 is stopped by controlling the valve 42 of the introduction path 30 and the drive motor P2m for the pressure pump. Is configured by including a control means 86.

  The introduced chemical liquid amount detecting means 56 and the impregnating chemical liquid quantity control means 8 are both stored in the control device 7, and an operation panel (not shown) for the operator to input the wood type and the like is stored in the control device 7. In addition, an output device (not shown) such as a monitor or a printer capable of outputting the detected amount of impregnating chemical is provided.

  The main components of the functional configuration of the chemical concentration adjusting apparatus 2 are a concentration detecting means 68 in the storage tank, a chemical amount detecting means 66 in the storage tank, and a chemical preparing means 9, all of which are the control device 7 of the chemical impregnation apparatus 1 in this embodiment. Stored in Here, the chemical preparation unit 9 includes a replenishing chemical amount setting unit 92 that sets, as a replenishing chemical amount, a chemical amount to be replenished from the preparation tank 28 to the chemical storage tank 20 based on detection by the chemical amount detector 61 in the storage tank, and a storage tank. Based on the detection of the internal concentration detection device 62, the chemical solution to be replenished is replenished so that the chemical solution concentration in the chemical solution storage tank 20 becomes a predetermined value by replenishing the chemical solution storage tank 20 from the preparation tank 28. Replenishment chemical concentration setting means 91 for setting the concentration as a replenishment chemical concentration, supply amount setting means 95 for setting the supply amount of the chemical raw material to be supplied to the preparation tank 28 based on the replenishment chemical amount and the replenishment chemical concentration, and metering It is configured to include a supply control means 96 for controlling the raw material supply device 70 based on the measurement of the total 63 to supply a predetermined amount of the chemical solution raw material to the preparation tank 28.

Next, the flow of processing in the chemical liquid impregnation apparatus 1 will be described with reference to FIGS. 1 and 3. First, prior to the start of the impregnation treatment, the amount of the chemical solution in the first storage tank 21 needs to be known (V ₀ ). In the process of the second time or later, since the first reservoir 21 is filled with the drug solution to a height of the partition wall 25 as described below, V ₀ is the same as the volume of the first reservoir. At the start of processing, the type of wood and the like can be input from the operation panel of the control device 7.

When the processing target wood is stored in the tank 10, the lid portion 11 is closed to close the tank 10, and the processing is started, first, the liquid in the second storage tank 22 monitored by the liquid level gauge 55. The surface height (H ₀ ) is acquired (step S1). Next, the valves 41 and 42 and the leak valve 46 are closed, and the vacuum pump P1 is driven with the valve 43 opened. Based on the pressure detected by the pressure gauge 53, the inside of the tank 10 reaches a predetermined degree of vacuum. Deaeration is performed (step S2). Thereby, the air in the open tube | pipe of a wood structure | tissue is also removed, and it will be in the state which a chemical | medical solution tends to osmose | permeate. Thereafter, when the valve 43 is closed, the vacuum pump P1 is stopped, and the valve 41 is opened, the chemical solution in the first storage tank 21 is sucked into the tank 10 through the main flow path 31 (step S3). At this time, since the end of the main channel 31 on the first storage tank 21 side is extended to the very vicinity of the bottom of the first storage tank 21, almost the entire amount (V ₀ ) of the chemical solution is introduced into the tank 10.

In this state, since the capacity of the tank 10 is 16 m ³ and the volume of the first storage tank 21 is 14 m ³ as described above, the tank 10 is not yet filled. Therefore, next, the valve 41 is closed, the valves 42 and 46 are opened, the pressurizing pump P2 is driven, and the chemical solution is introduced into the tank 10 from the second storage tank 22 through the introduction path 30 (step S4). Based on the detection by the liquid level sensor 52, the introduction of the chemical solution is continued while the tank 10 is not filled with the chemical solution (NO in step S5). When the tank 10 is filled with the chemical solution (YES in step S5), the liquid level height (H1) of the second storage tank 22 at the time of this filling is acquired (step S6), and H ₀ , H1, V ₀ , and the tank 10 are obtained. The volume of wood is calculated based on the volume of (step S7). At this time, the volume in the introduction path 30 can be taken into consideration.

  Next, based on the calculated wood volume and wood type, the impregnating chemical amount setting value (Vs) is determined in accordance with the JAS standard or the like (step S8). On the other hand, when the valve 46 is closed and the tank 10 is sealed (step S9) and the pressure in the tank 10 increases due to the continuation of the introduction of the chemical solution by the pressurizing pump P2, the pressurized chemical solution is pressed into the wood. Accordingly, the chemical solution is further introduced into the tank. At this time, when the pressure on the tank 10 side of the introduction path 30 becomes equal to or higher than a predetermined pressure by the action of the pressure adjustment valve 45, the chemical solution is returned to the second storage tank 22 through the discharge path 35, and the pressure in the tank 10 is 1. It is maintained at 0 to 1.5 MPa. The liquid surface height (H) of the second storage tank 22 is monitored during the introduction of the chemical liquid, and the amount of impregnating chemical liquid (V) actually impregnated into the wood based on the amount of the chemical liquid in the second storage tank 22 after the filling. ) Is detected (steps S10 and S11). In addition, the amount of decrease in the chemical solution in the second storage tank 22 after the filling is obtained from the product of the change in the liquid level (H1-H) and the horizontal sectional area of the second storage tank 22.

  Until the impregnating chemical liquid amount (V) reaches the impregnating chemical liquid amount set value (Vs), pressurization of the chemical liquid is continued (NO in step S12), and when the impregnating chemical liquid amount set value (Vs) is reached (step S12). In S12, the valve 42 is closed, the pressurizing pump P2 is stopped, and the introduction of the chemical solution from the second storage tank 22 to the tank 10 is stopped (step S13). Thereby, the chemical | medical solution for the impregnating chemical | medical solution amount setting value (Vs) determined according to the volume of the timber will be impregnated reliably to the timber.

  Next, when the valve 41 and the leak valve 46 are opened, surplus chemical solution in the tank 10 flows down to the first storage tank 21 through the main channel 31 (step S14). At this time, since the amount of the chemical liquid in the tank 10 is larger than the volume of the first storage tank 21, the chemical liquid fills the first storage tank 21, and then the second storage tank 22 arranged in parallel across the partition wall 25. Flow into. Thereafter, the liquid level (H2) of the second storage tank 22 is detected (step S15). When the liquid level is lower than the predetermined liquid level and it is necessary to replenish the chemical (YES in step S16), the valve 48 is used. Is opened and the liquid feed pump P3 is driven, and a new chemical liquid prepared in the preparation tank 28 is sent to the second storage tank 22 through the replenishment path 38 (step S17). On the other hand, when it is not necessary to replenish the chemical (NO in step S16), the next wood processing is executed (step S1) or impregnation processing depending on the presence / absence of a processing end command (step S18). Ends.

  Next, the flow of processing in the chemical concentration adjusting device 2 will be described with reference to FIGS. 1 and 4. First, when the impregnation process in the chemical liquid impregnation apparatus 1 is completed (YES in step S1), the concentration of the chemical liquid is detected based on the electrical conductivity in the first storage tank 21 (step S2), and the liquid level in the second storage tank 22 is detected. Based on the above, the amount of the chemical in the storage tank is detected (step S3). At this time, since the amount of the chemical solution in the first storage tank 21 is equal to the volume of the first storage tank 21, the amount of the chemical solution existing in the chemical solution impregnation apparatus 1 is detected by detecting the amount of the chemical solution in the second storage tank 22. Next, by comparing the amount of the chemical in the storage tank with the value determined as the minimum amount of the chemical liquid to be always stored in the second storage tank 22 and the comparison between the concentration in the storage tank and a predetermined concentration value, Whether or not replenishment is necessary is determined (step S4).

  When it is necessary to replenish (YES in step S4), a replenishing chemical amount is set based on the chemical amount in the storage tank (step S5), and the chemical liquid of the set replenishing chemical amount becomes a chemical existing in the chemical impregnating apparatus 1. The concentration of the replenishing chemical solution is calculated so that the concentration after the addition, that is, the concentration of the chemical solution impregnated in the next wood becomes a predetermined concentration (step S6). Note that the chemical liquid in the second storage tank 22 containing the newly replenished chemical liquid and the chemical liquid in the first storage tank 21 are introduced into the tank 10 after being introduced into the tank 10 during the impregnation process in the chemical liquid impregnation apparatus 1. To obtain a chemical solution having a predetermined concentration.

  When the supplement chemical concentration is set, the chemical concentration of the supplement chemical amount becomes the supplement chemical concentration, so that the amount of the chemical raw material to be supplied to the preparation tank 28 is set as the supply set amount (step S7). According to the set value, the raw material supply device 70 supplies the chemical raw material to the preparation tank 28. For example, when the supply set amounts for the liquid A, liquid B, liquid C and solvent are a, b, c and w (kg), respectively, first, the valve 75a is opened and the raw material tank 71a is connected via the supply path 73a. The liquid A is sent to the preparation tank 28, and the valve 73a is closed when the liquid A (kg) is supplied based on the measurement by the load cell (meter 63). Then, the valve 75b is opened, and b (kg) of the B liquid is supplied from the raw material tank 71b to the preparation tank 28 through the supply path 73b, so that a plurality of chemical liquid raw materials are sequentially supplied. Furthermore, the supplied chemical solution raw material is mixed and stirred in the preparation tank 28 to prepare a chemical solution having a replenishment chemical concentration (step S8).

  As described above, according to the chemical liquid impregnation apparatus 1 of the present embodiment, it is possible to grasp the amount of impregnating chemical liquid that could not be grasped only after the impregnation process is completed in real time as the impregnation process proceeds. it can. This makes it possible to reliably impregnate the wood with the amount of the chemical to be impregnated, even if the ease of penetration of the chemical varies depending on the type of wood, the density of the wood depending on the growth environment, the degree of drying, the cross-sectional shape, and the like. As a result, the quality of the treated wood is less varied.

  Further, since the amount of the impregnated chemical solution is less than the reference value, the generation of wood that needs to be reprocessed is suppressed, so that there is little risk of labor burden and cost increase due to twice labor. Furthermore, in the past, the treatment time was often set longer because of the fear that the amount of impregnated chemical would be less than the standard value, but it is necessary to impregnate the chemical excessively. Therefore, wasteful consumption of chemicals can be reduced.

  In addition, since the impregnation treatment is controlled not by the treatment time but by the amount of the impregnating chemical solution, the impregnation treatment is performed in a time required close to the necessary minimum, so that the treatment efficiency is improved and the running cost is minimized. It becomes possible to keep close to.

  Furthermore, the volume of the wood can be detected with high accuracy regardless of the shape of the wood, and the amount of the chemical solution to be impregnated is set according to the detected wood volume. It can be impregnated with a chemical solution.

  In addition, a series of processes such as wood volume detection, setting of impregnating chemical liquid amount setting value, detection of impregnating chemical liquid amount, comparison of impregnating chemical liquid amount setting value and impregnating chemical liquid amount, and stop of introduction of chemical liquid into tank 10 are automatically performed. Therefore, it becomes extremely efficient, and it is possible to reduce running costs by omitting manpower.

  In addition, since the liquid level is detected in the second storage tank 22 having a small horizontal sectional area, the change in the liquid level can be known more accurately. As a result, the amount of introduced chemical solution and thus the amount of impregnated chemical solution can be detected more accurately, and the control of the amount of chemical solution impregnated into the wood becomes more precise.

  Further, as described above, according to the chemical concentration adjusting apparatus 2 of the present embodiment, even if the chemical concentration varies in the chemical impregnation apparatus 1, the concentration is measured and fed back to set the supplemental chemical concentration. By doing so, the concentration of the chemical solution that is repeatedly used can be maintained substantially constant. As a result, the quality of the wood treated by the chemical solution impregnation apparatus 1 becomes small, and it is possible to prevent the excessive concentration of the chemical solution from being used as in the prior art, and there is no fear that the chemical solution is wasted. It will be a thing.

  In addition, since the replenishment chemical solution concentration and the replenishment chemical solution amount are set after grasping the amount of the existing chemical solution in the chemical solution storage tank 20, an appropriate amount of chemical solution is always replenished to the chemical solution impregnation processing apparatus 1. can do. Furthermore, the concentration can be detected accurately and easily by detecting the concentration of the chemical solution based on the electric conductivity.

  In addition, since the chemical raw material supplied by the load cell provided in the adjustment tank 60 is measured, a plurality of chemical raw materials can be measured in one configuration, so the chemical concentration adjusting device 2 itself has a simple configuration, The construction cost is low.

  The present invention has been described with reference to the preferred embodiments. However, the present invention is not limited to the above-described embodiments, and various improvements can be made without departing from the scope of the present invention as described below. And design changes are possible.

  For example, in the chemical liquid impregnation apparatus 1 of the present embodiment, the configuration in which the tank is decompressed by the vacuum pump and the chemical liquid is sucked from the first storage tank is illustrated, but the main flow path is provided with a pressure pump, and the chemical liquid is supplied from the first storage tank. It may be pumped into the tank. Moreover, the case where a constant pressure valve is attached to the pressurizing pump as the pressure adjusting valve is exemplified, but the present invention is not limited to this, for example, a relief valve is provided in the tank, and the tank and the chemical solution storage tank are connected by a discharge path via the relief valve. It is also possible to adopt a configuration in which the chemical solution is returned from the tank to the chemical solution storage tank when the pressure in the tank exceeds a certain pressure. Furthermore, although the configuration in which the amount of introduced chemical liquid is detected by the liquid level of the second storage tank is exemplified, a flow meter is provided in the introduction path / discharge path, and the amount of introduced chemical liquid can be detected by the integrated flow rate of the flowing chemical liquid. .

  Moreover, in the chemical | medical solution concentration adjustment apparatus 2 of this embodiment, although the case where the chemical | medical solution amount in a 2nd storage tank was detected and the replenishment chemical | medical solution amount was set based on this was illustrated, it is not limited to this. For example, as described above, when the chemical liquid is returned from the tank 10 to the first storage tank 21 in the chemical liquid impregnation apparatus 1 and the chemical liquid flows into the second storage tank 22 after filling the first storage tank 21, When the amount of chemical liquid flowing into the second storage tank 22 is smaller than the volume of the first storage tank 21 due to the volume setting or the amount of chemical liquid impregnated into the wood, the replenishment chemical concentration is set based on the volume of the first storage tank 21. Even so, it is possible to maintain the concentration of the chemical solution impregnated in the wood within a certain range.

  Furthermore, although the case where the supply amount of the chemical solution raw material is measured by mass is illustrated, a flow meter may be provided in each supply path, and the measurement may be performed by volume. In this case, it is possible to simultaneously perform an operation of supplying a plurality of chemical raw materials to the preparation tank 28.

  Moreover, in said embodiment, the replenishment path 38 is provided from the preparation tank 28 of the chemical | medical solution concentration adjustment apparatus 2 to the 2nd storage tank 2 which provided the liquid level height meter 52 in the chemical | medical solution impregnation apparatus 1 and has detected the amount of chemical | medical solutions introduced. For example, even when the chemical solution is replenished from the preparation tank while the chemical solution is impregnated into the wood, the amount of the chemical solution actually impregnated into the wood is accurately determined. It becomes possible to detect.

  In addition, in the present embodiment, the chemical concentration adjusting device 2 is one of the components of the chemical impregnating device 1, and each control means for controlling both devices is stored in one control device 7. However, the present invention is not limited to this, and both devices can be configured as separate devices.

  In the above embodiment, the case where one chemical concentration adjusting device 2 is applied to one chemical liquid impregnating device 1 is exemplified. For example, as illustrated in FIG. 5, a chemical prepared in a preparation tank is used. It is possible to provide a configuration in which a plurality of flow paths are provided to send the chemical solution to a plurality of chemical solution impregnating devices from a single chemical solution concentration adjusting device. Thereby, it is possible to perform a process of impregnating wood with chemical solutions having different concentrations and blending ratios with a plurality of chemical solution impregnation devices, while receiving chemical solution supplementation from a single chemical solution concentration adjusting device 2. Alternatively, as indicated by a broken line in the figure, the chemical solution impregnation apparatus 1 has a single tank 10 but a plurality of chemical liquid storage tanks 20, and each chemical liquid storage tank 20 has a single chemical liquid concentration adjusting device. By supplying chemical solutions having different concentrations and blending ratios from 2, it is possible to impregnate different chemical solutions according to the type of wood to be treated and the purpose of the treatment.

It is explanatory drawing which shows the structure of the chemical | medical solution concentration adjustment apparatus of this embodiment, and the chemical | medical solution impregnation apparatus to which this apparatus is applied. It is a block diagram which shows the functional structure of the chemical | medical solution concentration adjustment apparatus and chemical | medical solution impregnation apparatus of FIG. It is a flowchart which shows the flow of the process in the chemical | medical solution impregnation apparatus of FIG. It is a flowchart which shows the flow of the process in the chemical | medical solution concentration adjustment apparatus of this embodiment. It is explanatory drawing which shows the other application of the chemical | medical solution concentration adjustment apparatus with respect to a chemical | medical solution impregnation apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chemical liquid impregnation apparatus 2 Chemical liquid concentration adjustment apparatus 8 Impregnating chemical liquid amount control means 9 Chemical liquid preparation means 10 Tank 20 Chemical liquid storage tank 21 First storage tank (chemical liquid storage tank)
22 Second storage tank (chemical solution storage tank)
28 Preparation tank 30 Introduction path 45 Pressure adjustment valve 51 Introduced chemical amount detection device 52 Liquid level sensor 61 Chemical amount detection device in storage tank 62 Concentration detection device 63 in storage tank Meter 70 Raw material supply device P2 Pressure pump

Claims (3)

The chemical solution is introduced from the chemical solution storage tank into the container containing the wood so that the chemical solution is impregnated into the wood. A chemical concentration adjusting device for adjusting the concentration of a chemical,
A preparation tank in which a chemical solution is prepared;
A raw material supply device for supplying a chemical raw material to the preparation tank;
A meter for measuring the chemical solution raw material supplied to the preparation tank by the raw material supply device;
A concentration detecting device in the storage tank for detecting the concentration of the chemical liquid in the chemical storage tank;
Based on the detection of the concentration detecting device in the storage tank, by replenishing a predetermined amount of the chemical liquid from the preparation tank to the chemical liquid storage tank, the concentration of the chemical liquid in the chemical liquid storage tank becomes a predetermined value. The concentration of the chemical solution to be replenished is set as a replenishment chemical solution concentration, the supply amount of the chemical solution raw material to be supplied to the preparation tank is set as the supply set amount based on the replenishment chemical solution concentration, and the measurement based on the meter A chemical concentration adjusting apparatus, comprising: a chemical solution preparing unit that controls the raw material supply device to supply the supply amount of the chemical solution raw material to the preparation tank. Further comprising a chemical liquid amount detection device in the storage tank for detecting the chemical liquid volume in the chemical storage tank,
The chemical preparation means
Based on the detection of the chemical liquid amount detection device in the storage tank, a chemical liquid amount to be replenished from the preparation tank to the chemical liquid storage tank is set as a supplement chemical liquid quantity, and the supply set amount based on the supplement chemical liquid quantity and the supplement chemical liquid concentration The chemical concentration adjusting apparatus according to claim 1, wherein: An electrolyte solution is used for the chemical solution,
The chemical concentration adjusting apparatus according to claim 1 or 2, wherein the concentration detecting means in the storage tank detects the concentration of the chemical based on the electrical conductivity of the chemical.

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