Temperature calibration device for melt flow rate meter

Abstract

The utility model provides a temperature calibration device for a melt flow rate instrument, and relates to the technical field of temperature calibration. The device comprises a temperature isothermal device, a temperature measuring part and a temperature display part, the temperature isothermal device is composed of five temperature constant-temperature units, the temperature measuring part is composed of five thermocouples, the temperature constant-temperature units and the thermocouples are in one-to-one correspondence, the temperature display part is a multi-channel temperature tester, each temperature constant-temperature unit is an isothermal block, and the isothermal block is connected with the isothermal block. The five isothermal blocks are independently distributed in the upper end of a mouth mold of the melt flow rate instrument; the temperature sensing ends of the thermocouples are respectively embedded in the corresponding temperature constant-temperature units, and the cold ends of the thermocouples are respectively connected with the input end of the multi-channel temperature tester. According to the device, the five independent isothermal blocks and the thermocouples are used for sensing the temperature, the temperature fluctuation and the temperature gradient can be measured at the same time, the detection efficiency is improved, the defect that other calibration devices cannot measure the temperature gradient at the same time is overcome, and the market detection requirement is met.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature calibration, in particular to a temperature calibration device for a melt flow rate meter. Background Art

[0002] Melt flow rate meter, also called melt index meter, is used to measure the melt flow rate MFR or MVR value of various plastics and resins in viscous flow state. It is widely used in plastic production, plastic products, petrochemical and other industries as well as related colleges, scientific research institutions and commodity inspection departments.

[0003] The current calibration procedure for melt flow rate instruments is "JJG878-1994 Melt Flow Rate Instrument Calibration Procedure", which was issued in 1994, 30 years ago. The temperature standard specified in the procedure is a set of third-class mercury thermometers with a temperature range of 125℃ to 400℃. At present, third-class mercury thermometers are hard to find on the market. In addition, mercury thermometers are easy to break, inconvenient to operate, and there is a risk of mercury contamination.

[0004] At present, most metrology institutions use second-class standard platinum resistance thermometers to replace third-class mercury thermometers, and the temperature measurement accuracy meets the requirements. However, since the temperature sensing part of the second-class standard platinum resistance thermometer is about 60mm long, it is actually difficult to measure the temperature gradient in the area of ​​10mm to 50mm above the die.

[0005] Therefore, it is necessary to provide a melt flow rate meter temperature calibration device to achieve simultaneous measurement of temperature fluctuation and temperature gradient. Utility Model Content

[0006] The purpose of the utility model is to provide a melt flow rate meter temperature calibration device to solve the problem of simultaneous measurement of temperature fluctuation and temperature gradient in view of the above-mentioned deficiencies in the prior art.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] The utility model provides a temperature calibration device for a melt flow rate meter, the calibration device comprises: a temperature isothermal device, a temperature measuring part and a temperature display part, the temperature isothermal device is composed of five temperature constant temperature units, the temperature measuring part is composed of five thermocouples, the five temperature constant temperature units correspond to the five thermocouples one by one, the temperature display part is a multi-channel temperature tester, each temperature constant temperature unit is an isothermal block, and the five isothermal blocks of the temperature isothermal device are independently distributed in the upper end of the die of the melt flow rate meter;

[0009] The temperature sensing end of each of the five thermocouples is respectively buried in the corresponding temperature constant temperature unit, and the cold end of each of the five thermocouples is respectively connected to the input end of the multi-channel temperature tester.

[0010] Optionally, the thickness of each isothermal block is 5 mm, and the temperature sensing end of each of the five thermocouples is respectively buried at a thickness of 2.5 mm of the corresponding isothermal block.

[0011] Optionally, the five isothermal blocks of the temperature isothermal device are evenly distributed in a region of 10 mm to 50 mm above the die of the melt flow rate meter.

[0012] Optionally, five isothermal blocks are respectively located at 10 mm, 20 mm, 30 mm, 40 mm and 50 mm from the upper end of the die.

[0013] Optionally, the outer diameter of each isothermal block is consistent with the outer diameter of the die.

[0014] The beneficial effects of the utility model include:

[0015] The temperature calibration device of the melt flow rate meter provided by the utility model comprises: a temperature isothermal device, a temperature measuring part and a temperature display part, the temperature isothermal device is composed of five temperature constant temperature units, the temperature measuring part is composed of five thermocouples, the five temperature constant temperature units correspond to the five thermocouples one by one, the temperature display part is a multi-channel temperature tester, each temperature constant temperature unit is an isothermal block, and the five isothermal blocks of the temperature isothermal device are independently distributed in the upper end of the die of the melt flow rate meter; the temperature sensing end of each of the five thermocouples is respectively buried in the corresponding temperature constant temperature unit, and the cold end of each of the five thermocouples is respectively connected to the input end of the multi-channel temperature tester. The device senses temperature by 5 independent isothermal blocks and 5 independent thermocouples, can realize the simultaneous measurement of temperature fluctuation and temperature gradient, reduce the isothermal time, improve the detection efficiency, make up for the deficiency that other calibration devices cannot measure the temperature gradient at the same time, so as to meet the market detection needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 The overall structure schematic diagram of a melt flow rate meter temperature calibration device provided by an embodiment of the utility model is shown;

[0018] Figure 2 The schematic diagram of the principle of the temperature calibration device of the melt flow rate meter provided by one embodiment of the utility model is shown;

[0019] Figure 3 A schematic diagram of measuring the temperature of a die by a temperature calibration device for a melt flow rate meter provided by an embodiment of the utility model is shown;

[0020] Figure 4 Shows Figure 3 Schematic diagram of the enlarged structure of part A in the middle. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0024] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The temperature standard specified in the regulations is a set of third-class mercury thermometers with a temperature range of 125 to 400°C. At present, third-class mercury thermometers are hard to find on the market. In addition, mercury thermometers are easy to break, inconvenient to operate, and there is a risk of mercury contamination. At present, most metrology institutions use second-class standard platinum resistance thermometers to replace third-class mercury thermometers, and the temperature measurement accuracy fully meets the requirements. However, since the temperature sensing part of the second-class standard platinum resistance thermometer is about 60mm long, it is actually difficult to measure the temperature gradient in the 10 to 50mm area above the die.

[0027] Therefore, the present application provides a melt flow rate meter temperature calibration device to achieve simultaneous measurement of temperature fluctuation and temperature gradient.

[0028] Figure 1 The overall structure schematic diagram of a melt flow rate meter temperature calibration device provided by an embodiment of the utility model is shown; Figure 2 The schematic diagram of the principle of the temperature calibration device of the melt flow rate meter provided by one embodiment of the utility model is shown; Figure 3 A schematic diagram of measuring the temperature of a die by a temperature calibration device for a melt flow rate meter provided by an embodiment of the utility model is shown; Figure 4 Shows Figure 3 Schematic diagram of the enlarged structure of part A in the middle.

[0029] like Figure 1 As shown, the utility model provides a melt flow rate meter temperature calibration device, which includes: a temperature isothermal device 101, a temperature measuring unit 102 and a temperature display unit 103. The temperature isothermal device 101 is composed of five temperature constant temperature units, and the temperature measuring unit 102 is composed of five thermocouples. Specifically, the thermocouples can be Class I thermocouples, and the five temperature constant temperature units correspond to the five thermocouples one by one. The temperature display unit 103 is a multi-channel temperature tester. Figure 3 As shown, each temperature constant temperature unit is an isothermal block, and the five isothermal blocks of the temperature isothermal device 101 are independently distributed in the upper end of the die 301 of the melt flow rate meter.

[0030] like Figure 3 and Figure 4As shown, the temperature sensing end 121 of each of the five thermocouples is respectively buried in the corresponding temperature constant temperature unit, and the cold end of each of the five thermocouples is respectively connected to the input end of the multi-channel temperature tester, so as to achieve the purpose of simultaneous and accurate temperature measurement.

[0031] This calibration device consists of 5 independent isothermal units and 5 independent thermocouple thermometers, which can measure the temperature gradient in the 10-50mm area above the die. This calibration device can measure temperature fluctuation and temperature gradient simultaneously in the temperature range of 125-400℃, reduce isothermal time, and improve detection efficiency. It makes up for the deficiency of other calibration devices that cannot measure temperature gradients at the same time to meet market detection needs.

[0032] Alternatively, if Figure 3 and Figure 4 As shown, each isothermal block 111 has a thickness of 5 mm, and the temperature sensing end 121 of each of the five thermocouples is respectively embedded in the corresponding isothermal block 111 at a thickness of 2.5 mm. A heat insulating spacer 401 is provided between two adjacent isothermal blocks 111 .

[0033] Optionally, the five isothermal blocks of the temperature isothermal device are evenly distributed in the region of 10 mm to 50 mm above the die 301 of the melt flow rate meter. Specifically, the five isothermal blocks are respectively located at 10 mm, 20 mm, 30 mm, 40 mm and 50 mm above the die 301. Thus, the temperature at 10 mm, 20 mm, 30 mm, 40 mm and 50 mm above the die can be measured simultaneously.

[0034] The outer diameter of each isothermal block is consistent with the outer diameter of the die, so that the isothermal block can move flexibly in the cavity and fully contact with the cavity, thereby achieving accurate temperature measurement.

[0035] In actual operation, within the temperature range of 125-400℃, three temperature points are selected according to the verification procedures. The calibration device can be used to measure the temperature fluctuation and temperature gradient at the same time. According to the verification procedures, when the temperature reaches the set temperature, the temperature is kept constant for about 15 minutes, and the temperature is measured once every 10 minutes for three consecutive times to calculate the temperature fluctuation and temperature gradient. Repeat this operation for the measurement of the remaining temperature points. In order to ensure that the thermocouple is used under the specified technical performance, it is recommended that the recalibration cycle is less than 6 months. During the measurement process, the correction value of the thermocouple should be added.

[0036] In summary, the present application provides a melt flow rate meter temperature calibration device that can cover the temperature range of 125 to 400°C, realizes simultaneous measurement of temperature fluctuation and temperature gradient, so as to meet the temperature detection requirements of the melt flow rate meter, makes up for the deficiency that other calibration devices cannot measure the temperature gradient at the same time, improves the feasibility of temperature gradient measurement, shortens the temperature gradient measurement time, and improves detection efficiency.

[0037] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A melt flow rate meter temperature calibration device, characterized in that: The calibration device comprises: a temperature isothermal device, a temperature measuring part and a temperature display part. The temperature isothermal device is composed of five temperature constant temperature units. The temperature measuring part is composed of five thermocouples. The five temperature constant temperature units correspond to the five thermocouples one by one. The temperature display part is a multi-channel temperature tester. Each temperature constant temperature unit is an isothermal block. The five isothermal blocks of the temperature isothermal device are independently distributed in the upper end of the die of the melt flow rate instrument. The temperature sensing end of each of the five thermocouples is respectively buried in the corresponding temperature constant temperature unit, and the cold end of each of the five thermocouples is respectively connected to the input end of the multi-channel temperature tester.

2. The melt flow rate meter temperature calibration device according to claim 1, characterized in that: The thickness of each isothermal block is 5 mm, and the temperature sensing end of each of the five thermocouples is respectively buried at a thickness of 2.5 mm of the corresponding isothermal block.

3. The melt flow rate meter temperature calibration device according to claim 1, characterized in that: The five isothermal blocks of the temperature isothermal device are evenly distributed in the area of ​​10 mm to 50 mm above the die of the melt flow rate instrument.

4. The melt flow rate meter temperature calibration device according to claim 3, characterized in that: The five isothermal blocks are respectively located at 10 mm, 20 mm, 30 mm, 40 mm and 50 mm from the upper end of the die.

5. The melt flow rate meter temperature calibration device according to claim 3, characterized in that: The outer diameter of each isothermal block is consistent with the outer diameter of the die.

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