JPH078754U - Heating / drying type moisture meter - Google Patents

Abstract

(57) [Summary] [Purpose] Dry the sample in the sample dish of the heat-drying moisture meter with the main heater from above and at the same time heat it with the auxiliary heater from below as well to accelerate the drying of the sample and measure the water content. Reduce the time required. [Structure] In a heating and drying type moisture meter in which a sample in a sample dish 1 is heated and dried from above with an infrared lamp, a film heater 9 is attached to the bottom surface of the bottom of the sample dish 1 so that the sample is heated from below as well. To accelerate heating and drying,
Shorten the time required to measure water content.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat-drying type moisture meter for measuring a change in weight of a sample by heating the sample from above and obtaining the water content of the sample from the change in weight.

[0002]

[Description of Prior Art]

 As shown in FIG. 6, the heat-drying type moisture meter typically includes a pan support 4 fixed to the upper end of the weighing column 5a of the load meter 5, a sample pan 1 mounted on the pan support 4, and a pan. Lower windshield 2b surrounding the pan 4 and the sample tray 1, an upper windshield 2a provided above the pan tray 4, an infrared lamp 3 mounted inside the upper windshield 2a to heat the sample in the sample tray 1 from above, a load A housing 8 containing a total of 5 and supporting the upper windshield 2a and the lower windshield 2b, a plurality of push-up bars 6 penetrating the upper surface of the housing 8 and the bottom of the tray 4 and the lower end of the push-up bar 6 are fixed. It is composed of a lifting mechanism including a lifting lever 7. The infrared lamp 3 heats the sample in the sample dish 1 from above to evaporate the water content in the sample and at the same time measures the weight of the sample to obtain the water content from the following formula, and the water content (% ) Is displayed.

[0003]

[Equation 1] W ₀ −W _t M = ──────── W ₀ where M: water content of sample W ₀ : initial total weight (sum of sample and sample pan weight) W _t : after heat drying Gross weight

Since the lifting mechanism raises the sample dish 1 with the push-up rod 6 when the sample is not measured, the zero point of the load meter 5 can be corrected in this state. It is possible to operate the elevating mechanism at a predetermined time interval and perform the zero point correction periodically. The above mechanism is not required when using a precision electronic balance for the heat-drying moisture meter. However, in a heat-drying type moisture meter that uses a strain gauge balance, the measurement takes a long time (5 to 100 minutes), and thus the above-described lifting mechanism is necessary.

[0005]

[Problems to be solved by the device]

 In the above structure, since the sample is heated and dried only from the infrared lamp 3 from above, it takes a long time. It is an object of the present invention to provide a heat-drying type moisture meter having a novel structure capable of shortening the sample drying time.

[0006]

[Means to solve the problem]

 According to the present invention, the sample is heated and dried from above to measure the weight change of the sample, and in the heat-drying type moisture meter which obtains the water content of the sample from this weight change, the bottom of the sample dish is heated. A heat-drying type moisture meter is provided, which is provided with a heating source for heating.

[0007]

[Action]

 Since the heating source for heating the bottom of the sample dish is provided, the heating and drying from the bottom can be obtained in addition to the heating and drying from the top, so that the heating and drying of the sample can be promoted.

[0008]

【Example】

 The present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a sectional view of a heat-drying type moisture meter according to an embodiment of the present invention. This heat-drying type moisture meter has almost the same configuration as the conventional heat-drying type moisture meter of FIG. 6, and common parts are denoted by the same reference numerals as those in the figure. A load meter 5 is fixed to the bottom of the box-shaped housing 8, and the tip of a weighing column 5a extending vertically upward penetrates an opening 8a formed in the upper wall of the housing 8 and projects above the housing 8. ing. The tray support 4 is fixed to the tip of the weighing column 5a. A plurality of through holes 4a (three places in this embodiment) are provided on the bottom surface of the tray receiver 4, and the upper end portion of the push-up bar 6 of the lifting mechanism, which will be described later, penetrates through these through holes 4a. ing. A lower windshield 2b is provided on the upper surface of the housing 8 so as to surround the pan receiver 4. A support (not shown) fixed to the upper surface of the housing 8 is rotatably provided with an upper windshield 2a. When the heating / drying type moisture meter is in operation, the upper windshield 2a is aligned and positioned directly above the lower windshield 2a. Has become.

The sample dish 1 is placed on the dish receiver 4. An elevating mechanism is provided in the housing 8, and an elevating and lowering lever 7 made of an insulator of the elevating mechanism is configured to swing up and down. The tip of the elevating lever 7 is located around the load meter 5. It has a ring-shaped tip portion that surrounds it, and the lower end portion of the push-up rod 6 is fixed to this tip portion. The push-up bar 6 penetrates a hole 8a provided in the upper surface of the housing 8 and projects upward. As described above, the tip of the push-up rod 6 further penetrates the through hole 4a at the bottom of the tray support 4 described above, and when the lift lever 7 swings upward, the push-up rod 6 moves the sample. The dish 1 is designed to be elevated (see FIG. 2). At least the back tip portion of the push-up rod 6 is made of a conductive material such as iron, and serves as a power supply conductor to the lower heating source described later. FIG. 3 is a perspective view showing the sample dish 1. As a lower heating source, which is an essential part of the present invention, a film heater 9 composed of a film on which a heater wire is pattern-printed is attached to the lower surface of the bottom of the sample dish 1. Has been.

FIG. 4a is a top view of the film heater 9, and FIG. 4b is a bottom view thereof. FIG. 5 is a sectional view thereof. The film heater 9 is formed by pattern-printing a heater wire 9b on the upper surface of a heat-resistant resin substrate 9a, and covering it with an insulating layer 9i. Note that reference numerals 9e and 9f are power supply terminals. Circular ring-shaped conductor strips 9d and 9c are provided on the insulating layer 9i, and these conductor strips 9e and 9f are electrically connected to the heater wire 9c and the lead wires 9g and 9h, respectively. The upper end of the push-up bar 6 comes into contact with these conductor strips 9c and 9d so that electric power is supplied to the heater wire 9c. Reference numeral 9j in FIG. 4a is a lead wire for connecting the output terminal of the heater wire 9c to the power supply terminal 9f.

The operation of the above embodiment will be described below. The sample dish 1 which does not contain the sample is set on the dish tray 4, and is placed on the sample dish 1 with the upper windshield 2a. In this state, the elevating mechanism 7 operates to elevate the push-up rod 6, elevate the sample dish 1, and perform zero correction (tearing) of the load meter 5. Then, the elevating mechanism 7 lowers the push-up rod 6 to set the sample pan 6 on the pan pan 4, the sample pan 6 is set on the pan pan 4, and the weight of the sample pan is measured. After that, when the sample is put in the sample dish 1, the load meter 5 measures the weight of the sample. Then, the infrared lamp 3 in the upper windshield 2a is turned on to heat and dry the sample to start moisture measurement. The elevating mechanism 7 is repeatedly moved up and down to move the sample dish 1 up and down, and the zero point is corrected and the sample weight is measured as described above. The above operation is repeated until the sample is sufficiently dried. A change in the sample weight can be obtained from the sample weight before the start of heating and drying and the sample weight after the completion of heating and drying, and the moisture value can be calculated from this change using the above equation. When the sample dish 1 is raised by the push-up rod 6, the load cell 5 is not measuring. At this time, electric power can be supplied to the film heater 9 provided at the bottom of the sample dish 1 to accelerate heating and drying of the sample. At this time, electric power can be supplied to the film heater 9 via the push-up rod 6 such that the tip of the push-up rod 6 contacts the conductor strips 9c and 9d. At least the tip of the push-up rod 6 can be used as a conductor to supply electric power to the tip of the conductor via an electric wire.

Although the present invention has been described in detail in the form of an embodiment, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the claims of the utility model. It is possible. For example, in the above-described embodiment, the film heater 9 is attached to the bottom lower surface of the sample dish 1, but the heater 9 is attached to the bottom upper surface of the dish receiver 4, and the weight support rod of the weighing scale 5 is attached. It may be hollow, and power may be supplied to the heater on the tray 4 through a power supply lead wire. Further, instead of providing the push-up rod 6, the load mechanism 5 is vertically moved relative to the housing 8 by an elevating mechanism. Further, the pan receiver 4 is fixed and the upper end of the load meter 5 penetrates the pan receiver 4 You may make it possible to receive the plate 1. In this case, the load meter 5 moves up to lift the sample pan 1 from the pan support 4 to measure the sample weight, and when the load meter 5 descends, the sample pan 1 stabilizes on the pan support 4 and in this state Electric power can be supplied to the film heater 9 of the sample dish 1 via the receptacle 4. In short, the gist of the present invention is to heat the sample from above and below in the heat-drying type moisture meter.

[0013]

【effect】

 As described above, since both the upper heating source and the lower heating source heat and dry the sample from above and below, evaporation of water in the sample can be promoted, and therefore, measurement of water in the sample can be promoted. According to an experiment conducted by the inventor, it took 7 minutes to measure the water content of 2% instant coffee with a sample weight of 5 g, which was conventionally 7 minutes, which is a reduction of 3 minutes.

[Brief description of drawings]

FIG. 1 is a sectional view showing a heat-drying type moisture meter according to an embodiment of the present invention.

FIG. 2 is a sectional view showing the heat-drying type moisture meter shown in FIG. 1 in one operating position.

FIG. 3 is a perspective view showing a sample dish for the same heat-drying type moisture meter.

FIG. 4 (a) is a top view showing a film heater attached to the bottom of the sample dish shown in FIG. (B) The bottom view which shows the same film heater.

FIG. 5 is a sectional view of the film heater.

FIG. 6 is a sectional view showing a conventional heat-drying type moisture meter.

[Explanation of symbols]

 1 Sample dish 2a Upper windshield 2b Lower windshield 3 Upper heating source 4 Dish tray 5 Load meter 6 Push-up rod 7 Lifting lever 8 Housing 9 Lower heating source

Claims (2)

[Scope of utility model registration request] 1. A heat-drying type moisture meter, wherein a sample in a sample dish is heated and dried from above to measure a weight change of the sample, and the water content of the sample is determined from the weight change. A heat-drying type moisture meter characterized in that a heating source for heating the bottom of the plate is provided. 2. The heat-drying type moisture meter according to claim 1, wherein the heating source is a film heater provided on the lower surface of the bottom of the sample dish.