Device and method for measuring freezing point of paraffin

Abstract

The invention discloses a device and a method for measuring the freezing point of paraffin. The device for measuring the freezing point of the paraffin comprises an environment simulation mechanism, a temperature control mechanism and a control mechanism, the environment simulation mechanism comprises a sampling assembly, a supporting rod, a sample vessel, a motor and a monitoring assembly which are arranged in the closed cavity; the temperature control mechanism is used for controlling the temperature in the closed cavity; the sampling assembly comprises an outer tube and a sampling rod; the outer pipe is connected with the supporting rod through a rotary limiting assembly. A temperature acquisition module is arranged at one end of a sample dipping head of the sampling rod, and the other end of the sampling rod is connected with a rotating shaft of the motor; the motor is fixedly connected with the outer pipe; the control mechanism is used for controlling reciprocating rotation of the sampling assembly between a vertical state and a horizontal state and driving the sampling rod to rotate by the motor; the monitoring assembly comprises an infrared transmitting module, an infrared receiving module and a result generating module; the paraffin freezing point is monitored through infrared signals, and the accuracy of paraffin freezing point measurement is improved.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum product detection, in particular to a device and method for determining the freezing point of paraffin. Background Art

[0002] The paraffin freezing point refers to the temperature at which the melted paraffin stops flowing after cooling under specified conditions. The paraffin freezing point is an indicator that indirectly reflects the average molecular weight and composition of wax products and the degree of hardness at room temperature. It can reflect the safety and ease of storage, processing and transportation. The paraffin freezing point is an important property of paraffin and an important quality indicator in the import and export trade of paraffin. The current paraffin freezing point determination method in my country is SH / T 0132-1992, and the current international standard is ISO 2207-1980.

[0003] At present, the paraffin freezing point determination method is usually manually determined by operators. First, the sample is melted to attach a drop of paraffin to the mercury bulb of the thermometer, and then placed in a preheated flask air hood. The paraffin drop and the thermometer mercury bulb are naturally cooled to solidification while rotating at a fixed speed.

[0004] The inventors have found through research that the paraffin freezing point determination method in the prior art has at least the following defects:

[0005] Manual observation of the freezing point of paraffin wax is prone to subjective errors, resulting in low accuracy in the determination of the freezing point of paraffin wax.

[0006] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0007] The purpose of the present invention is to improve the accuracy of paraffin freezing point measurement.

[0008] The present invention provides a device for determining the freezing point of paraffin wax, comprising:

[0009] Environmental simulation mechanism, temperature control mechanism and control mechanism;

[0010] The environmental simulation mechanism includes a sampling assembly, a support rod, a sample dish, a motor and a monitoring assembly arranged in the sealed cavity; the temperature control mechanism is used to control the temperature in the sealed cavity;

[0011] The sampling assembly comprises an outer tube and a sampling rod arranged in the outer tube; the outer tube is connected to the support rod through a rotation limit assembly, and the control mechanism is used to control the sampling assembly to reciprocate 90 degrees between a vertical state and a horizontal state; a temperature acquisition module is provided at one end of the sample dipping head of the sampling rod, and the other end of the sampling rod is connected to the rotating shaft of the motor; the motor is fixedly connected to the outer tube; the control mechanism is also used to control the motor; when the sampling rod is in a vertical state, the sample carrying head enters the sample dish;

[0012] The monitoring component includes an infrared transmitting module, an infrared receiving module and a result generating module. The optical path of the infrared transmitting module includes a position at a preset distance below the sample dipping head when the sampling rod is in a vertical state. The result generating module is used to obtain the temperature data of the temperature acquisition module as a measurement result when the infrared receiving module receives an infrared signal.

[0013] Preferably, in an embodiment of the present invention, the monitoring component further comprises:

[0014] An auxiliary infrared transmitting module and an auxiliary infrared receiving module; the optical path of the auxiliary infrared transmitting module includes a position at a preset distance above the sample dipping head when the sampling rod is in a vertical state;

[0015] The result generating module is also used to verify the accuracy of the measurement result by judging whether the infrared signal received by the auxiliary infrared receiving module is interrupted when generating the measurement result.

[0016] Preferably, in the embodiment of the present invention, the material of the sealed cavity is a uniform heat transfer material.

[0017] Preferably, in an embodiment of the present invention, the sealed cavity is made of glass.

[0018] Preferably, in an embodiment of the present invention, the position of the preset distance below the sample dipping head includes: 0.5mm-3mm.

[0019] Preferably, in an embodiment of the present invention, the position at a preset distance above the sample dipping head includes: 0.5mm-1mm.

[0020] In another aspect of the present invention, there is also provided a method for determining the freezing point of paraffin wax, which is used in the above-mentioned device for determining the freezing point of paraffin wax, comprising the steps of:

[0021] S11, adding a paraffin sample of the measurement target into the sample dish, and raising the temperature in the closed cavity to a preset initial temperature through a temperature control mechanism;

[0022] S12, when the paraffin sample is completely melted, the sampling stick is controlled to be in a vertical state, and is turned to a horizontal state after dipping the paraffin sample;

[0023] S13, the motor drives the sampling rod to rotate at a preset speed, and starts the infrared transmitting module and the infrared receiving module;

[0024] S14. When the infrared receiving module receives the infrared signal, the temperature data of the temperature acquisition module is obtained as a measurement result.

[0025] Preferably, in an embodiment of the present invention, when generating the measurement result, it also includes:

[0026] It is determined whether the infrared signal received by the auxiliary infrared receiving module is interrupted. If so, the measurement result is verified; if not, the measurement result is not verified.

[0027] Preferably, in an embodiment of the present invention, the preset initial temperature includes: 75°C-99°C.

[0029] Preferably, in an embodiment of the present invention, the preset rotation speed includes: 2-3 seconds / revolution.

[0031] Preferably, in an embodiment of the present invention, whether the paraffin sample is completely melted is observed through a preset observation window.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The invention provides a device for determining the freezing point of paraffin, comprising: an environment simulation mechanism, a temperature control mechanism and a control mechanism; the environment simulation mechanism comprises a sampling component, a support rod, a sample dish, a motor and a monitoring component arranged in a closed cavity; the temperature control mechanism is used to control the temperature in the closed cavity; the sampling component comprises an outer tube and a sampling rod arranged in the outer tube; the outer tube is connected to the support rod through a rotation limit assembly; a temperature acquisition module is provided at one end of a sample dipping head of the sampling rod, and the other end of the sampling rod is connected to a rotating shaft of a motor; the motor is fixedly connected to the outer tube; the control mechanism is used to control the sampling component to reciprocate 90 degrees between a vertical state and a horizontal state and to be used for the motor to drive the sampling rod to rotate; the monitoring component comprises an infrared transmitting module, an infrared receiving module and a result generating module.

[0034] The working principle of the automatic freezing point determination method in the present invention is that in the initial stage of freezing of the paraffin sample, when the droplet-shaped paraffin sample at one end of the sample dipping head of the sampling rod is not solidified, the semi-liquid paraffin sample is affected by gravity, and its center of gravity will always be below the sample dipping head. At this time, the infrared signal emitted by the infrared transmitting module will be blocked; as the sample temperature in the closed cavity continues to decrease, the paraffin sample will surround the sample dipping head and solidify and rotate with the sampling rod, and its center of gravity will be raised to the center position of the sample dipping head. At this time, the infrared optical path will not be blocked, and the infrared receiving module will receive the infrared signal; then, using the infrared signal as a trigger signal, the result generation block uses the current temperature data of the temperature acquisition module as the measurement result, that is, the freezing point of the paraffin sample is obtained; in the present invention, the infrared receiving module will receive the infrared signal while the paraffin sample is solidified, so as to obtain the corresponding measurement result in time, thereby improving the accuracy of the paraffin freezing point measurement; this solves the problem that the method of manually observing the freezing point of paraffin in the prior art is prone to subjective errors, resulting in low accuracy of the paraffin freezing point measurement.

[0035] In addition, the present invention adopts a temperature control mechanism to control the temperature in the closed cavity; adopts a control mechanism to control the rotation speed of the sampling component, which can avoid interference from human factors, realize the automation of paraffin freezing point determination, and further improve the accuracy of paraffin freezing point determination.

[0036] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, and to make the above and other purposes, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments 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.

[0038] Figure 1 It is a schematic diagram of the main structure of the device for measuring the freezing point of paraffin described in the present invention;

[0039] Figure 2 It is another schematic diagram of the main structure of the device for measuring the freezing point of paraffin according to the present invention;

[0040] Figure 3 1 is a schematic side view of the structure of the device for measuring the freezing point of paraffin wax according to the present invention;

[0041] Figure 4It is another side view schematic diagram of the structure of the device for measuring the freezing point of paraffin according to the present invention;

[0042] Figure 5 It is a step diagram of the method for determining the freezing point of paraffin described in the present invention. DETAILED DESCRIPTION

[0043] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0044] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0045] In this document, the terms "first", "second", etc. are used to distinguish two different elements or parts, and are not used to limit a specific position or relative relationship. In other words, in some embodiments, the terms "first", "second", etc. can also be interchangeable.

[0046] Embodiment 1

[0047] In order to improve the accuracy of paraffin freezing point determination, refer to Figures 1 to 4 , in an embodiment of the present invention, a device for determining the freezing point of paraffin is provided, comprising: an environment simulation mechanism 100, a temperature control mechanism 200 and a control mechanism (not shown in the figure);

[0048] The environmental simulation mechanism 100 includes a sampling assembly, a support rod 01, a sample dish 02, a motor 03 and a monitoring assembly arranged in a closed cavity; the temperature control mechanism 200 is used to control the temperature in the closed cavity; the sampling assembly includes an outer tube 04 and a sampling rod 05 arranged in the outer tube 04; the outer tube 04 is connected to the support rod 01 through a rotation limit assembly 06; the control mechanism is used to control the sampling assembly to reciprocate 90 degrees between a vertical state and a horizontal state through the rotation limit assembly 06; a temperature acquisition module (not shown in the figure) is provided at one end of the sample dipping head 07 of the sampling rod 05, and the other end of the sampling rod 05 is connected to the rotating shaft of the motor 03; the motor 03 is fixedly connected to the outer tube 04; the control mechanism is also used to control the motor 03 to drive the sampling rod 05 to rotate; when the sampling rod 05 is in a vertical state, the sample dipping head 07 enters the sample dish 02;

[0049] The monitoring component includes an infrared transmitting module 11, an infrared receiving module 12 and a result generating module (not shown in the figure). The optical path of the infrared transmitting module 11 includes a position at a preset distance below the sample dipping head 07 when the sampling rod 05 is in a vertical state; the result generating module is used to obtain the temperature data of the temperature acquisition module as the measurement result when the infrared receiving module 12 receives the infrared signal.

[0050] The inventors have found through research that the current method for determining the freezing point of paraffin wax is usually to manually observe the freezing point of paraffin wax, which is prone to subjective errors. In addition, due to the light color of paraffin wax, it is also difficult to observe the test endpoint, resulting in low accuracy in the determination of the freezing point of paraffin wax.

[0051] In the embodiment of the present invention, the freezing process of the paraffin sample is monitored by the monitoring component. When the paraffin droplet at one end of the sample dipping head 07 of the sampling rod 05 is not solidified, Figure 3 As shown, the center of gravity of the paraffin droplet will always be directly below the sample dipping head 07, and the infrared signal emitted by the infrared emitting module 11 will be blocked; as the temperature in the closed cavity continues to decrease, the paraffin droplet begins to solidify. Figure 4 As shown, the paraffin droplets will rotate with the sampling rod 05 and evenly surround the sample dipping head 07. At this time, the center of gravity of the solidified paraffin rises to the center position of the sample dipping head 07 and no longer blocks the infrared light path. Therefore, the infrared receiving module 12 will receive the infrared signal. At this time, the result generation module obtains the current temperature data of the temperature acquisition module as the measurement result (i.e., the freezing point of the paraffin sample).

[0052] In an embodiment of the present invention, the optical path of the infrared transmitting module 11 includes a position at a preset distance below the sample dipping head 07 when the sampling rod 05 is in a vertical state; wherein the position at a preset distance below the sample dipping head 07 may include: 0.5mm-3mm.

[0053] Preferably, in order to more accurately monitor the paraffin freezing process, in an embodiment of the present invention, the monitoring component may also include: an auxiliary infrared transmitting module and an auxiliary infrared receiving module; the optical path of the auxiliary infrared transmitting module includes a position at a preset distance above the sample dipping head 07 when the sampling rod 05 is in a vertical state; the result generating module is also used to verify the accuracy of the measurement result by determining whether the infrared signal received by the auxiliary infrared receiving module is interrupted when generating the measurement result. Specifically, when the paraffin sample has not solidified, the main part of the semi-liquid paraffin sample is below the sample dipping head 07, and there is very little paraffin sample above the sample dipping head 07. At this time, the infrared light path emitted by the auxiliary infrared transmitting module can be directly sent to the auxiliary infrared receiving module. When the paraffin sample solidifies, the paraffin sample above the sample dipping head 07 will increase, thereby blocking the infrared light path emitted by the auxiliary infrared transmitting module. In this way, when the auxiliary infrared receiving module cannot receive the infrared signal, the result generating module can generate a verification result to verify the measurement result generated by the infrared receiving module 12, so as to avoid the misjudgment caused by the measurement result generated by the dripping of liquid paraffin sample on the sample dipping head 07.

[0054] In the embodiment of the present invention, the position at a preset distance above the sample dipping head 07 may include: 0.5mm-1mm.

[0055] In the embodiment of the present invention, in order to simulate the temperature at each stage of the paraffin freezing process, the environmental simulation mechanism 100 can be set as a closed cavity, and the closed cavity can include a heat preservation cover and a base, and the bottom of the heat preservation cover is tightly connected with the base to form a closed cavity; the material of the heat preservation cover can be selected from a uniform heat transfer material; in addition, the temperature control mechanism 200 arranged outside the heat preservation cover can control the temperature inside the heat preservation cover;

[0056] In the embodiment of the present invention, by rotating the limit assembly 06, the control mechanism can control the sampling rod 05 to be in a vertical state so that the sample dipping head 07 can dip the liquid paraffin sample (such as Figure 2 Then, the sampling rod 05 is driven to rotate to a horizontal state (as shown in Figure 1 At this time, the control mechanism can start the motor 03 to drive the sampling rod 05 to rotate. In practical applications, the sample dipping head 07 can be made of a smooth material, such as glass, so that after the sample dipping head 07 dips the paraffin sample in the sample dish 02, when the sampling rod 05 rotates, the paraffin droplets will not rotate with the sample dipping head 07 before solidification, thereby making the determination of the freezing point of the paraffin more accurate.

[0057] In addition, in order to ensure the horizontal position of the heat preservation cover, a horizontal adjuster can be connected to the heat preservation cover, and the horizontal position of the heat preservation cover can be adjusted by adjusting the horizontal adjuster.

[0058] In order to conveniently know whether the paraffin sample in the sample dish is completely liquefied, preferably, in the embodiment of the present invention, an observation window for observing the paraffin sample in the sample dish 02 may be further provided on the sealed cavity.

[0059] The specific implementation of the present invention is described below in conjunction with a specific application scenario. Figure 1 In this specific application scenario, the paraffin sample to be tested is first placed in the sample dish 02, and the temperature inside the heat preservation cover is controlled by the temperature control mechanism 200. When the paraffin sample is observed to be completely melted, the control mechanism controls one end of the sample dipping head 07 of the sampling rod 05 of the sampling assembly to dip the paraffin sample in the sample dish 2, and then the control mechanism controls the sampling rod 05 to rotate to a horizontal position.

[0060] The control mechanism controls the motor 03 to drive the sampling component to rotate at the set speed, and stops the temperature control at the same time. The monitoring component starts monitoring at the same time. When the paraffin droplets at one end of the sample dipping head 07 have not solidified, their center of gravity will always be directly below this end. At this time, the infrared signal emitted by the infrared transmitting module 11 will be blocked. As the temperature in the thermal insulation cover continues to decrease and the paraffin droplets begin to solidify, they will rotate with the sample dipping head 07 and evenly surround the sample dipping head 07. At this time, the infrared receiving module 12 receives the test endpoint signal, and the result generation module obtains the temperature data of the temperature acquisition module, that is, tests the freezing point of the paraffin sample.

[0061] When the temperature inside the heat preservation cover drops under the ambient temperature, in order to shorten the ineffective time, intervention cooling can be used to improve the cooling efficiency, such as using a cooling system to cool the heat preservation cover.

[0062] The following describes the use of the automatic freezing point determination device in the embodiment of the present invention in combination with a plurality of examples.

[0063] Example 1:

[0064] 1. Place a paraffin sample in the sample dish 02, and control the temperature in the heat preservation cover to 75°C through the temperature control mechanism 200;

[0065] 2. After observing that the paraffin sample is completely melted, the control mechanism controls the sampling assembly to dip the paraffin sample;

[0066] 3. Turn on the motor 03, which drives the sampling rod 05 to start rotating at a speed of 2 seconds per revolution;

[0067] 4. The infrared transmitting module 11 starts to send infrared signals. When the droplets rotating with the sample dipping head 07 solidify, the infrared receiving module 12 receives the infrared signals.

[0068] 5. The result generation module obtains the temperature data from the temperature acquisition module, which is the freezing point of the paraffin sample.

[0069] Example 2:

[0070] 1. Place a paraffin sample in the sample dish 02, and control the temperature in the heat preservation cover to 80°C through the temperature control mechanism 200;

[0071] 2. After the paraffin sample is completely melted, the control mechanism controls the sampling assembly to dip the paraffin sample;

[0072] 3. Turn on the motor 03, which drives the sampling rod 05 to start rotating at a speed of 3 seconds per revolution;

[0073] 4. The infrared transmitting module 11 starts to send infrared signals. When the droplets rotating with the sample dipping head 07 solidify, the infrared receiving module 12 receives the infrared signals.

[0074] 5. The result generation module obtains the temperature data from the temperature acquisition module, which is the freezing point of the paraffin sample.

[0075] Example 3:

[0076] 1. Place a paraffin sample in the sample dish 02, and control the temperature in the heat preservation cover to 99°C through the temperature control mechanism 200;

[0077] 2. After observing that the paraffin sample is completely melted, the control mechanism controls the sampling assembly to dip the paraffin sample;

[0078] 3. Turn on the motor 03, which drives the sampling rod 05 to start rotating at a speed of 2.5 seconds per revolution;

[0079] 4. The infrared transmitting module 11 starts to send infrared signals. When the droplets rotating with the sample dipping head 07 solidify, the infrared receiving module 12 receives the infrared signals.

[0080] 5. The result generation module obtains the temperature data from the temperature acquisition module, which is the freezing point of the paraffin sample.

[0081] In summary, the working principle of the automatic freezing point determination method in the embodiment of the present invention is that in the initial stage of freezing of the paraffin sample, when the droplet-shaped paraffin sample at one end of the sample dipping head of the sampling rod is not solidified, the semi-liquid paraffin sample is affected by gravity, and its center of gravity will always be below the sample dipping head. At this time, the infrared signal emitted by the infrared transmitting module will be blocked; as the temperature in the closed cavity continues to decrease, the paraffin sample will evenly surround the sample dipping head and solidify, and its center of gravity will be raised to the center position of the sample dipping head. At this time, the infrared optical path will not be blocked, and the infrared receiving module will receive the infrared signal; then, using the infrared signal as a trigger signal, the result generation block uses the current temperature data of the temperature acquisition module as the measurement result, that is, the freezing point of the paraffin sample is obtained; in the embodiment of the present invention, the infrared receiving module will receive the infrared signal while the paraffin sample is solidified, so as to obtain the corresponding measurement result in time, thereby improving the accuracy of the paraffin freezing point measurement; this solves the problem that the method of manually observing the freezing point of paraffin in the prior art is prone to subjective errors, resulting in low accuracy of the paraffin freezing point measurement.

[0082] In addition, the embodiment of the present invention adopts a temperature control mechanism to control the temperature in the closed cavity; the control mechanism is used to control the rotation speed of the sampling component, which can avoid interference from human factors, realize the automation of paraffin freezing point determination, and further improve the accuracy of paraffin freezing point determination.

[0083] Embodiment 2

[0084] The embodiment of the present invention is compatible with the paraffin freezing point determination device in the above embodiment, and further provides a paraffin freezing point determination method. That is, the paraffin freezing point determination method in the embodiment of the present invention can be implemented using the paraffin freezing point determination device in the first embodiment. Figure 4 As shown, the specific steps include:

[0085] S11, adding a paraffin sample of the measurement target into the sample dish, and raising the temperature in the closed cavity to a preset initial temperature through a temperature control mechanism;

[0086] In the embodiment of the present invention, the paraffin sample to be tested is placed in a sample dish, and the temperature in the heat preservation cover is controlled to different preset temperature values ​​by the temperature control mechanism 200.

[0087] Furthermore, in the implementation of the present invention, the preset initial temperature includes: controlling the temperature in the closed cavity to a set temperature value through the temperature control mechanism 200; for example, it can be set to a temperature between 75°C and 99°C.

[0088] S12, when the paraffin sample is completely melted, the sampling stick is controlled to be in a vertical state, and is turned to a horizontal state after dipping the paraffin sample;

[0089] In the embodiment of the present invention, when the paraffin sample is observed to be completely melted, the control mechanism controls the sampling rod 05 to be in a vertical state, at which time the sample dipping head 07 dips the paraffin sample in the sample dish 02, and then the control mechanism controls the sampling rod 05 to rotate to a horizontal position.

[0090] S13, the motor drives the sampling rod to rotate at a preset speed, and starts the infrared transmitting module and the infrared receiving module;

[0091] In an embodiment of the present invention, the preset rotation speed includes: controlling the sampling rod 05 to different rotation speeds through a control mechanism; that is, controlling the motor 03 through the control mechanism to drive the sampling rod 05 to rotate at a set rotation speed, while stopping heating, and starting the infrared transmitting module 11 and the infrared receiving module 12 to start monitoring.

[0092] S14. When the infrared receiving module receives the infrared signal, the temperature data of the temperature acquisition module is obtained as a measurement result.

[0093] In the embodiment of the present invention, when the droplet-shaped paraffin sample at one end of the sample dipping head 07 has not solidified, it will always be directly below the sample dipping head 07. At this time, the infrared signal emitted by the infrared transmitting module 11 will be blocked. As the temperature in the thermal insulation cover continues to decrease and the paraffin sample begins to solidify, it will rotate with the sampling assembly. At this time, the infrared receiving module 12 receives the test endpoint signal. At this time, the result generating module obtains the temperature data of the temperature collecting module, that is, the freezing point of the tested paraffin sample.

[0094] Furthermore, in an embodiment of the present invention, when generating the measurement result, it also includes: determining whether the infrared signal received by the auxiliary infrared receiving module 12 is interrupted, if so, the measurement result passes the verification; if not, the measurement result fails the verification; that is, if the infrared receiving module 12 receives the test endpoint signal, the measurement result passes the verification; if the infrared receiving module 12 does not receive the test endpoint signal, the measurement result fails the verification.

[0095] To sum up, the working principle of the automatic freezing point determination method of the present invention is to monitor the freezing process of the paraffin sample through the monitoring component. When the droplet-shaped paraffin sample at one end of the sample dipping head of the sampling rod has not solidified, the semi-liquid paraffin sample is affected by gravity, and its center of gravity will always be directly below the end. At this time, the infrared signal emitted by the infrared transmitting module will be blocked; as the temperature in the closed cavity continues to decrease, the paraffin sample will evenly surround the sample dipping head and solidify, and its center of gravity will be raised to the center position of the sample dipping head. At this time, the infrared receiving module receives the infrared signal, and the result generating module immediately obtains the current temperature data of the temperature acquisition module as the measurement result; the embodiment of the present invention solves the problem that the method of manually observing the freezing point of paraffin in the prior art is prone to subjective errors, which in turn leads to low accuracy in the determination of the freezing point of paraffin.

[0096] In addition, in the embodiment of the present invention, a temperature control mechanism is used to control the temperature in the closed cavity; a control mechanism is used to control the rotation speed of the sampling component, which can avoid interference from human factors, realize the automation of paraffin freezing point determination, and further improve the accuracy of paraffin freezing point determination.

[0097] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for measuring the freezing point of paraffin, characterized in that: include: Environmental simulation mechanism, temperature control mechanism and control mechanism; The environmental simulation mechanism includes a sampling assembly, a support rod, a sample dish, a motor and a monitoring assembly arranged in the sealed cavity; the temperature control mechanism is used to control the temperature in the sealed cavity; The sampling assembly comprises an outer tube and a sampling rod arranged in the outer tube; the outer tube is connected to the support rod through a rotation limit assembly; the control mechanism is used to control the sampling assembly to reciprocate 90 degrees between a vertical state and a horizontal state; a temperature acquisition module is provided at one end of the sample dipping head of the sampling rod, and the other end of the sampling rod is connected to the rotating shaft of the motor; the motor is fixedly connected to the outer tube; the control mechanism is also used to control the motor; when the sampling rod is in a vertical state, the sample carrying head enters the sample dish; The monitoring component includes an infrared transmitting module, an infrared receiving module and a result generating module. The optical path of the infrared transmitting module includes a position at a preset distance below the sample dipping head when the sampling rod is in a vertical state. The result generating module is used to obtain the temperature data of the temperature acquisition module as a measurement result when the infrared receiving module receives an infrared signal.

2. The device for measuring the freezing point of paraffin according to claim 1, characterized in that: The monitoring component also includes: An auxiliary infrared transmitting module and an auxiliary infrared receiving module; the optical path of the auxiliary infrared transmitting module includes a position at a preset distance above the sample dipping head when the sampling rod is in a vertical state; The result generating module is also used to verify the accuracy of the measurement result by judging whether the infrared signal received by the auxiliary infrared receiving module is interrupted when generating the measurement result.

3. The device for measuring the freezing point of paraffin according to claim 1, characterized in that: The material of the sealed cavity is a uniform heat transfer material.

4. The device for measuring the freezing point of paraffin according to claim 3, characterized in that: The sealed cavity is made of glass.

5. The device for measuring the freezing point of paraffin according to claim 1, characterized in that: The preset distance below the sample dipping head includes: 0.5mm-3mm.

6. The device for measuring the freezing point of paraffin according to claim 1, characterized in that: The preset distance position above the sample dipping head includes: 0.5mm-1mm.

7. A method for determining the freezing point of paraffin wax, used in the device for determining the freezing point of paraffin wax as claimed in any one of claims 1 to 6, characterized in that: Includes steps: S11, adding a paraffin sample of the measurement target into the sample dish, and raising the temperature in the closed cavity to a preset initial temperature through a temperature control mechanism; S12, when the paraffin sample is completely melted, the sampling stick is controlled to be in a vertical state, and is turned to a horizontal state after dipping the paraffin sample; S13, the motor drives the sampling rod to rotate at a preset speed, and starts the infrared transmitting module and the infrared receiving module; S14. When the infrared receiving module receives the infrared signal, the temperature data of the temperature acquisition module is obtained as a measurement result.

8. The method for determining the freezing point of paraffin according to claim 7, characterized in that: When generating the measurement results, it also includes: It is determined whether the infrared signal received by the auxiliary infrared receiving module is interrupted. If so, the measurement result is verified; if not, the measurement result is not verified.

9. The method for determining the freezing point of paraffin according to claim 7, characterized in that: The preset initial temperature includes: 75℃-99℃。 10. The method for determining the freezing point of paraffin according to claim 7, characterized in that: The preset speed includes: 2-3 seconds / lap.

11. The method for determining the freezing point of paraffin according to claim 7, characterized in that: Observe through a preset observation window whether the paraffin sample is completely melted.

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