Plastic pipe ash content measuring instrument and measuring method

Abstract

The invention belongs to the technical field of detection, and discloses a plastic pipe ash content determinator and a determination method.The plastic pipe ash content determinator comprises a heating furnace, an exhaust device and a gas transmission device.The heating furnace comprises a shell and a top cover, a heating groove is formed in the top of the shell, a plurality of positioning through holes are formed in the bottom of the heating groove, and a weighing device is arranged below each positioning through hole; a tray is placed on each weighing device, the upper end of the tray penetrates through the corresponding positioning through hole, a gap is formed between the tray and the hole wall of the positioning through hole, the tray is used for bearing a sample cup, and the sample cup is used for loading a plastic pipe sample; the device has the advantages of improving the measurement precision, avoiding cross contamination of samples, and realizing flexible heating control and accurate weighing.

Description

Technical Field

[0001] The present application relates to the field of detection technology, and in particular to an ash content measuring instrument and a measuring method for plastic pipes. Background Art

[0002] Ash content determination is one of the important test items for plastic pipe quality inspection. The plastic pipe sample is heated to make it burn, and the remaining substance after full combustion is the ash. The weight of the ash is obtained by weighing, and finally the proportion of the weight of the ash in the initial weight of the plastic pipe sample is calculated to obtain the ash content. Ash content determination is usually completed using an ash analyzer.

[0003] When using an ash content analyzer to measure ash content, it is usually necessary to place the plastic pipe sample in a sample cup, and then place the sample cup in a heating chamber for heating and combustion. However, in actual operation, if the temperature rises too quickly, the plastic pipe sample may burn too violently. The hot air generated by the combustion may form a violent airflow under the spatial constraints of the sample cup, thereby forming dust and affecting the accuracy of the measurement results.

[0004] In order to improve the detection efficiency, some inspectors will put multiple plastic pipe samples into the ash analyzer for ash content measurement at the same time. Although this practice can improve efficiency, it also has potential risks. If a plastic pipe sample generates dust due to excessive combustion, it may cause cross-contamination between different plastic pipe samples, making the measurement results of all plastic pipe samples unreliable.

[0005] In addition, the design of existing ash content analyzers often does not fully consider the airflow control problem during the sample combustion process. The lack of an effective airflow control mechanism may aggravate the dust phenomenon and increase the error of the measurement results. At the same time, existing ash content analyzers usually use a fixed heating curve and cannot be flexibly adjusted according to different types of plastic pipe samples, which may cause some samples to burn incompletely or over-burn.

[0006] The ash content measuring instruments in the prior art also have deficiencies in the design of the weighing device. The weighing devices of some ash content measuring instruments are directly exposed to high temperature environments and are easily affected by heat, which affects the weighing accuracy. In addition, the existing ash content measuring instruments often lack an effective sample cup positioning mechanism, which may cause the sample cup to shift during the heating process, affecting the accuracy of the measurement results.

[0007] In view of the above problems, the existing technology needs to be improved urgently. Summary of the invention

[0008] The purpose of the present application is to provide a plastic pipe ash content measuring instrument and measuring method, which can improve the measurement accuracy, avoid sample cross contamination, and achieve flexible heating control and accurate weighing.

[0009] In the first aspect, the present application provides a plastic pipe ash content measuring instrument, comprising a heating furnace, an exhaust device and a gas transmission device; the heating furnace comprises a shell and a top cover; a heating trough is arranged on the top of the shell, a plurality of positioning through holes are opened at the bottom of the heating trough, a weighing device is arranged below each of the positioning through holes, a tray is placed on each of the weighing devices, the upper end of the tray passes through the corresponding positioning through hole, and there is a gap between the tray and the hole wall of the positioning through hole, the tray is used to support a sample cup, and the sample cup is used to load a plastic pipe sample; The top cover is rotatably connected to the top of the shell, and a heating device is provided on a side facing the top of the shell, and the heating device is used to heat the slot cavity of the heating slot body; The heating tank body is provided with a temperature sensor and has an air inlet and an air outlet; the temperature sensor is used to measure the temperature in the tank cavity of the heating tank body; the air inlet is connected to the air supply device, and the air outlet is connected to the exhaust device, the air supply device is used to supply air to the tank cavity of the heating tank body, and the exhaust device is used to discharge the air in the tank cavity of the heating tank body out of the heating furnace; A main control module is also provided in the shell, and the weighing device, the heating device, the temperature sensor, the exhaust device and the gas supply device are all electrically connected to the main control module. The main control module is used to adjust the power of the heating device according to the measurement result of the temperature sensor to control the temperature in the tank cavity of the heating tank body, and calculate the ash content of each plastic pipe sample according to the weighing result of the weighing device.

[0010] By setting up multiple independent weighing devices and trays, multiple plastic pipe samples can be measured at the same time, thereby improving the measurement efficiency. At the same time, the gap between the tray and the positioning through hole can effectively prevent the friction between the tray and the heating tank body and affect the weighing accuracy. In addition, by controlling the heating device, exhaust device and gas supply device by the main control module, flexible heating control and airflow adjustment can be achieved to improve the measurement accuracy. The weighing device is arranged under the heating tank body to avoid the influence of high temperature on the weighing accuracy. Therefore, the present application has the advantages of improving the measurement accuracy, avoiding cross contamination of samples, and realizing flexible heating control and precise weighing.

[0011] Preferably, the heating trough body, the tray and the sample cup are made of high-temperature resistant ceramics, graphite, polytetrafluoroethylene or corundum; and a heat insulating layer is provided on the outer wall surface of the heating trough body.

[0012] By selecting high temperature resistant materials and setting up a heat insulation layer, this technical solution effectively solves the heat resistance and heat insulation problems of the plastic pipe ash content meter in a high temperature working environment. The high temperature resistant materials ensure the stability of key components at high temperatures, while the heat insulation layer improves heating efficiency and enhances safety. These features work together to enable the ash content meter to operate reliably under high temperature conditions, while ensuring the accuracy of the measurement results and the safety of operation.

[0013] Preferably, a cover sealing body made of the same material as the heating trough body is provided on the side of the top cover facing the top of the shell; the heating device is arranged in the middle of the cover sealing body; an annular protrusion protruding from the top of the shell is provided on the upper end of the heating trough body, and an annular groove matching the annular protrusion is provided on the side of the cover sealing body facing the top of the shell, and when the top cover seals the top of the shell, the annular protrusion and the annular groove are nested with each other.

[0014] By arranging a cover seal body made of the same material as the heating tank body on the inner side of the top cover, the heat resistance and sealing performance of the top cover can be improved. A heating device is arranged in the middle of the cover seal body to make the heating more uniform.

[0015] Preferably, the shell has an exhaust chamber, an air intake chamber and an equipment chamber that are isolated from each other; the weighing device is arranged in the air intake chamber, the air inlet and the air delivery device are both connected to the air intake chamber; the air outlet and the exhaust device are both connected to the exhaust chamber; the main control module is arranged in the equipment chamber.

[0016] Preferably, the exhaust cavity is an annular cavity arranged around the heating tank body, and a plurality of the air outlets are evenly arranged on the peripheral wall of the heating tank body along the circumferential direction; The air inlet cavity is located below the heating tank body, and a plurality of air inlets are provided on the bottom wall of the heating tank body.

[0017] Preferably, the positioning through holes and the weighing device are evenly arranged around the central axis of the heating tank body; An annular guide plate coaxially arranged with the heating trough body is arranged in the air inlet cavity, and the annular guide plate divides the air inlet cavity into a first air chamber and a second air chamber; the weighing device is located in the second air chamber, and the air inlet is connected to the second air chamber; the first air chamber surrounds the second air chamber and is connected to the gas transmission device, and a side of the first air chamber close to the second air chamber has an annular channel connected to the second air chamber, the width of the annular channel gradually decreases in the direction close to the second air chamber, and the outlet of the annular channel is directly opposite to each of the weighing devices.

[0018] Preferably, a positioning groove is provided at the bottom of the tray, and a heat-insulating positioning protrusion matched with the positioning groove is provided at the top of the weighing device, and the heat-insulating positioning protrusion extends into the positioning groove to position the tray.

[0019] Preferably, the gas delivery device includes a gas delivery pump, an oxygen tank and an air filter, the oxygen tank and the air filter are both connected to the input port of the gas delivery pump through a pipeline, and an electromagnetic flow valve is respectively connected between the oxygen tank and the gas delivery pump and between the air filter and the gas delivery pump; the air filter is used to filter external air and deliver it to the gas delivery pump, and the oxygen tank is used to deliver oxygen to the gas delivery pump; the gas delivery pump and the electromagnetic flow valve are both electrically connected to the main control module, and the main control module is also used to adjust the oxygen content of the air delivered to the slot cavity of the heating slot body through the two electromagnetic flow valves.

[0020] In a second aspect, the present application provides a determination method, based on the above-mentioned plastic pipe ash content determination instrument, comprising the steps of: A1. Place multiple empty sample cups into the multiple trays and perform tare weight removal; A2. Place a plurality of plastic pipe samples into each of the sample cups and obtain the initial weight of each of the plastic pipe samples; A3. Obtaining a reference heating curve of each plastic pipe sample according to the category information of each plastic pipe sample; the reference heating curve includes a plurality of heating sections and a plurality of heat preservation sections; A4. Generate a total heating curve according to the reference heating curves of the plastic pipe samples; the total heating curve includes a plurality of heating sections and a plurality of insulation sections; wherein the heating rate of each heating section of the total heating curve is calculated according to the heating rate of the corresponding heating section in the reference heating curve of each plastic pipe sample, and the insulation temperature and insulation time of the insulation section of the total heating curve are calculated according to the insulation temperature and insulation time of the corresponding insulation section in the reference heating curve of each plastic pipe sample; A5. Control the temperature in the tank cavity of the heating tank according to the total heating curve so that each of the plastic pipe samples is fully burned; A6. Obtain the ash weight of each of the plastic pipe samples after combustion, and calculate the ash content of each of the plastic pipe samples based on the ash weight and the initial weight.

[0021] Preferably, step A5 comprises: In each heat preservation section of the total heating curve, the weight change rate of each plastic pipe sample is obtained, and the oxygen content of the air input into the slot cavity of the heating slot body is adjusted according to the weight change rate.

[0022] Beneficial effects: The plastic pipe ash content measuring instrument and measuring method provided in the present application can measure multiple plastic pipe samples at the same time by setting up multiple independent weighing devices and trays, thereby improving the measuring efficiency. At the same time, the gap between the tray and the positioning through hole can effectively prevent the friction between the tray and the heating tank body and affect the weighing accuracy. In addition, by controlling the heating device, the exhaust device and the gas supply device through the main control module, flexible heating control and airflow adjustment can be achieved to improve the measuring accuracy. The weighing device is arranged under the heating tank body to avoid the influence of high temperature on the weighing accuracy. Therefore, the present application has the advantages of improving the measuring accuracy, avoiding cross-contamination of samples, and achieving flexible heating control and precise weighing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of a plastic pipe ash content measuring instrument provided in an embodiment of the present application.

[0024] Figure 2 This is a three-dimensional diagram of a heating furnace.

[0025] Figure 3 for Figure 1 Enlarged view of the S part.

[0026] Figure 4 It is a structural schematic diagram of the gas transmission device.

[0027] Figure 5 A flow chart of the determination method provided in the embodiments of the present application.

[0028] Figure 6 Schematic diagram of the reference heating curve.

[0029] Explanation of reference numerals: 1. heating furnace; 101. input module; 102. display; 2. exhaust device; 3. gas delivery device; 301. gas delivery pump; 302. oxygen tank; 303. air filter; 304. electromagnetic flow valve; 4. housing; 401. exhaust chamber; 402. air intake chamber; 4021. first air chamber; 4022. second air chamber; 403. equipment chamber; 404. annular guide plate; 405. air intake connection port; 406 , exhaust connection port; 5, top cover; 501, force handle; 6, heating trough; 601, positioning through hole; 602, air inlet; 603, air outlet; 604, thermal insulation layer; 605, annular protrusion; 7, weighing device; 701, thermal insulation positioning protrusion; 8, tray; 801, positioning groove; 9, sample cup; 10, heating device; 11, temperature sensor; 12, main control module; 13, cover body; 1301, annular groove. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0031] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0032] Ash content determination is an important part of plastic pipe quality inspection. The ash content is calculated by heating the plastic pipe sample to make it burn and measuring the weight of the remaining material. However, in practical applications, when using traditional ash content determination instruments to simultaneously determine multiple plastic pipe samples, technical problems often arise, such as excessive burning of the samples leading to dust and cross contamination. This problem seriously affects the accuracy and reliability of the determination results.

[0033] Specifically, when multiple plastic pipe samples are simultaneously tested for ash content in the heating chamber, if some samples burn violently due to rapid temperature rise, a strong hot air flow may be formed in the sample cup. Due to the limited space in the sample cup, these hot air flows easily form vortices, which roll up tiny particles that are not completely burned and form dust. These dusts will not only affect the measurement results of the current sample, but may also drift into other sample cups, causing cross-contamination. For example, in a typical multi-sample ash measurement process, if three different plastic pipe samples of PVC, PE and PP are placed in the tester at the same time, due to their different combustion characteristics, the PVC sample may begin to burn violently at a lower temperature, generating a large amount of dust, and these dusts may contaminate the adjacent PE and PP samples, resulting in higher ash content measurement results.

[0034] From a technical perspective, if this problem cannot be effectively solved, it will have a serious impact on the quality control and product development of plastic pipes. First, the inaccuracy of the measurement results will directly affect the reliability of product quality assessment, which may cause unqualified products to be misjudged as qualified or qualified products to be mistakenly eliminated. Secondly, since it is impossible to accurately measure multiple samples at the same time, the test efficiency will be greatly reduced, increasing production costs and product development cycles. In addition, inaccurate ash content data may mislead the optimization direction of material formulations and affect the research and development process of new products. Therefore, the development of an ash measurement technology that can effectively control dust and cross-contamination problems during the simultaneous measurement of multiple samples is of great significance to improving the accuracy, efficiency and reliability of plastic pipe quality inspection. To this end, the present application provides an innovative design scheme for an ash content meter for plastic pipes.

[0035] Please refer to Figure 1-Figure 4 In some embodiments of the present application, a plastic pipe ash content measuring instrument comprises a heating furnace 1, an exhaust device 2 and a gas delivery device 3; the heating furnace 1 comprises a shell 4 and a top cover 5; a heating tank 6 is arranged on the top of the shell 4, and a plurality of positioning through holes 601 are opened at the bottom of the heating tank 6, and a weighing device 7 is arranged below each positioning through hole 601, and a tray 8 is placed on each weighing device 7, and the upper end of the tray 8 passes through the corresponding positioning through hole 601, and there is a gap between the tray 8 and the hole wall of the positioning through hole 601 (such as Figure 3 As shown), the tray 8 is used to support the sample cup 9, and the sample cup 9 is used to load the plastic pipe sample; The top cover 5 is rotatably connected to the top of the shell 4, and a heating device 10 is provided on one side facing the top of the shell 4, and the heating device 10 is used to heat the tank cavity of the heating tank body 6; The heating tank body 6 is provided with a temperature sensor 11 and an air inlet 602 and an air outlet 603; the temperature sensor 11 is used to measure the temperature in the tank cavity of the heating tank body 6; the air inlet 602 is connected to the air supply device 3, and the air outlet 603 is connected to the exhaust device 2, the air supply device 3 is used to supply air to the tank cavity of the heating tank body 6, and the exhaust device 2 is used to discharge the air in the tank cavity of the heating tank body 6 out of the heating furnace 1; A main control module 12 is also provided in the shell 4. The weighing device 7, the heating device 10, the temperature sensor 11, the exhaust device 2 and the gas supply device 3 are all electrically connected to the main control module 12. The main control module 12 is used to adjust the power of the heating device 10 according to the measurement result of the temperature sensor 11 to control the temperature in the tank cavity of the heating tank body 6, and calculate the ash content of each plastic pipe sample according to the weighing result of the weighing device 7.

[0036] By setting up multiple independent weighing devices 7 and trays 8, multiple plastic pipe samples can be measured at the same time, thereby improving the measurement efficiency. At the same time, the gap between the tray 8 and the positioning through hole 601 can effectively prevent the tray 8 from rubbing against the heating tank body 6 and affecting the weighing accuracy. In addition, by controlling the heating device 10, the exhaust device 2 and the gas supply device 3 through the main control module 12, flexible heating control and airflow regulation can be achieved to improve the measurement accuracy. The weighing device 7 is arranged below the heating tank body 6 to avoid the influence of high temperature on the weighing accuracy. Therefore, the present application has the advantages of improving the measurement accuracy, avoiding cross contamination of samples, and achieving flexible heating control and precise weighing.

[0037] Specifically, by opening a plurality of positioning through holes 601 at the bottom of the heating tank body 6, and arranging an independent weighing device 7 and a tray 8 under each positioning through hole 601, physical isolation of the sample is achieved. The sample cup 9 is placed on the weighing device 7 through the tray 8, rather than directly pressed on the weighing device 7. The tray 8 can play a certain role in heat insulation, which can reduce the heat transferred to the weighing device 7 to ensure the normal operation of the weighing device 7, thereby ensuring the weighing accuracy. There is a gap between the tray and the wall of the positioning through hole 601, which can effectively prevent the friction between the tray 8 and the heating tank body 6 and affect the weighing accuracy.

[0038] The temperature sensor 11 and the main control module 12 cooperate to achieve accurate control of the temperature in the heating tank 6. The main control module 12 adjusts the power of the heating device 10 in real time according to the measurement result of the temperature sensor 11, avoiding the problem of excessive combustion of the sample due to excessive temperature.

[0039] By providing the gas delivery device 3 and the exhaust device 2, the air flow in the heating tank 6 is regulated. This can not only control the oxygen supply during the combustion process, but also discharge the gas generated by the combustion in time, further reducing the generation of dust and the risk of cross contamination.

[0040] By arranging an independent weighing device 7 under each sample, real-time monitoring of the weight change of the sample is achieved. This can not only detect abnormal conditions in time, but also be directly used to calculate the ash content, thereby improving the accuracy and efficiency of the measurement.

[0041] In the actual operation process, the plastic pipe sample is first placed in the sample cup 9, and then the sample cup 9 is placed on the tray 8. Next, the top cover 5 is closed and the main control module 12 is started. The main control module 12 controls the power of the heating device 10 according to the set temperature curve, and adjusts the working status of the gas supply device 3 and the exhaust device 2 to maintain proper air flow. During the heating process, the temperature sensor 11 continuously monitors the temperature in the tank cavity of the heating tank body 6, and the main control module 12 adjusts the heating power in real time according to the feedback information so that the temperature in the heating tank body 6 changes according to the set temperature curve. At the same time, the weighing device 7 continuously monitors the change in the sample weight. When the sample is completely burned, the main control module 12 calculates the ash content based on the final weight data.

[0042] The design of this working principle fully considers the problems that may arise when measuring multiple samples at the same time. Through precise temperature control and air flow regulation, dust problems caused by excessive burning of samples can be effectively avoided. At the same time, independent sample isolation design and real-time weight monitoring further reduce the risk of cross contamination and improve the accuracy of measurement results.

[0043] The exhaust device 2 can be implemented by, but is not limited to, an exhaust fan or an exhaust fan. The output end of the exhaust device 2 can also be connected to an exhaust gas purification device to purify the exhaust gas.

[0044] The air delivery device 3 may be implemented by, but is not limited to, a blower or a compressed air system.

[0045] The weighing device 7 may be implemented by, but is not limited to, a strain gauge weighing sensor or other weighing sensors.

[0046] The temperature sensor 11 may be implemented by, but is not limited to, a thermocouple or a platinum resistance temperature sensor.

[0047] The main control module 12 refers to a core unit for controlling the entire measurement process, and can be implemented by a microprocessor or a programmable logic controller.

[0048] Among them, the heating tank body 6, the tray 8 and the sample cup 9 need to be made of high temperature resistant materials, which can be set according to actual needs. For example, the heating tank body 6, the tray 8 and the sample cup 9 are made of high temperature resistant ceramics, graphite, polytetrafluoroethylene or corundum. These materials have good high temperature resistance and can withstand high temperature environments without deformation or damage. This ensures that these key components can maintain stability and reliability during the high temperature ash determination process.

[0049] Furthermore, the outer wall surface of the heating tank 6 is provided with a heat insulation layer 604, such as Figure 1 , Figure 3It can effectively reduce the heat loss to the outside, improve the heating efficiency, and also protect the safety of the external environment and other equipment in the heating furnace 1.

[0050] By selecting high temperature resistant materials and providing the heat insulation layer 604, this technical solution effectively solves the heat resistance and heat insulation problems of the plastic pipe ash content meter in a high temperature working environment. The high temperature resistant materials ensure the stability of key components at high temperatures, while the heat insulation layer 604 improves the heating efficiency and enhances safety. These features work together to enable the ash content meter to operate reliably under high temperature conditions, while ensuring the accuracy of the measurement results and the safety of the operation.

[0051] Furthermore, the heat insulation layer 604 disposed on the outer wall surface of the heating tank body 6 can be made of a variety of materials and structures. For example, high-efficiency heat insulation materials such as ceramic fiber, mineral wool, and aerogel can be used. The thickness of the heat insulation layer 604 can be adjusted according to actual needs, usually between 10 mm and 50 mm. The heat insulation layer 604 can be made of a multi-layer structure, with the inner layer made of high-temperature resistant material and the outer layer made of material with lower thermal conductivity, so as to further improve the heat insulation effect.

[0052] Furthermore, a heat insulation layer 604 may be provided on the outer surface of the tray 8 to further reduce the heat transferred to the weighing device 7 .

[0053] As a preferred embodiment, the heating tank body 6, the tray 8 and the sample cup 9 can be made of high-purity alumina ceramic material, which can withstand temperatures up to 1800°C, which is sufficient to meet the requirements of ash content determination of most plastic pipes. The heat insulation layer 604 of the outer wall of the heating tank body 6 can adopt a three-layer structure: the inner layer is 5mm thick refractory wool, the middle layer is 20mm thick aerogel felt, and the outer layer is 2mm thick reflective insulation coating. Even if the internal temperature of the tank cavity of the heating tank body 6 reaches 1000°C, this multi-layer structure can control the temperature of the outer wall of the heating tank body 6 below 50°C.

[0054] In some embodiments, see Figure 1 , Figure 2 A cover 13 made of the same material as the heating trough body 6 is arranged on the side of the top cover 5 facing the top of the shell body 4; the heating device 10 is arranged in the middle of the cover 13; an annular protrusion 605 protruding from the top of the shell body 4 is arranged on the upper end of the heating trough body 6, and an annular groove 1301 matched with the annular protrusion 605 is arranged on the side of the cover 13 facing the top of the shell body 4. When the top cover 5 covers the top of the shell body 4, the annular protrusion 605 and the annular groove 1301 are nested with each other.

[0055] By arranging a cover 13 made of the same material as the heating trough body 6 on the inner side of the top cover 5, the heat resistance and sealing of the top cover 5 can be improved. A heating device 10 is arranged in the middle of the cover 13 to make the heating more uniform. An annular protrusion 605 protruding from the top of the shell 4 is arranged at the upper end of the heating trough body 6, and an annular groove 1301 adapted thereto is arranged at the cover 13. The two are nested with each other, which can further improve the sealing and prevent heat and gas leakage. These features cooperate with each other to jointly improve the sealing and sealing of the top cover 5 of the heating furnace 1, and effectively solve the problem of insufficient sealing of the top cover 5 of the heating furnace 1. By improving the structure of the top cover 5, the heating environment can be better controlled, and the accuracy and reliability of ash content determination can be improved. At the same time, good sealing can also prevent the leakage of gas and dust generated during sample combustion, thereby ensuring the cleanliness and safety of the test environment.

[0056] Specifically, the cover sealing body 13 is made of the same material as the heating tank body 6. This design can ensure that the cover sealing body 13 has a thermal expansion coefficient similar to that of the heating tank body 6, thereby maintaining good sealing performance in a high temperature environment.

[0057] The heating device 10 can be an electric heating wire, an infrared heating element or other suitable heating elements. The heating device 10 is arranged in the middle of the cover 13, so that the heat can be evenly distributed from the top to the bottom, avoiding the problem of uneven heating.

[0058] When the top cover 5 covers the top of the housing 4, the annular protrusion 605 and the annular groove 1301 are nested with each other. This nested structure forms a labyrinth seal, which can effectively prevent the leakage of heat and gas. The depth of the nesting can be adjusted according to actual needs, usually in the range of 2mm-10mm. Deeper nesting can provide a better sealing effect, but the convenience of opening and closing the top cover 5 also needs to be considered.

[0059] As a preferred embodiment, the annular protrusion 605 can be designed to have an inclined side wall, and the inclination angle can be between 30° and 60°. This design can make the closing process of the top cover 5 smoother and provide a better sealing effect in the closed state. The annular groove 1301 can be designed to a matching shape accordingly to ensure a perfect fit.

[0060] Furthermore, a high temperature resistant sealing material, such as a graphite gasket or a ceramic fiber pad, may be added to the contact surface between the annular protrusion 605 and the annular groove 1301. This additional sealing layer may further improve the sealing effect, especially in a high temperature environment. The thickness of the sealing material may be in the range of 0.5 mm to 2 mm, depending on the material used and the expected operating temperature.

[0061] In order to facilitate the closing and opening operations of the top cover 5, a force applying handle 501 can be provided on the top cover 5. Figure 2 shown.

[0062] In some preferred embodiments, see Figure 1 The shell 4 has an exhaust chamber 401, an air inlet chamber 402 and an equipment chamber 403 which are isolated from each other; the weighing device 7 is arranged in the air inlet chamber 402, the air inlet 602 and the air delivery device 3 are both connected to the air inlet chamber 402; the air outlet 603 and the exhaust device 2 are both connected to the exhaust chamber 401; the main control module 12 is arranged in the equipment chamber 403.

[0063] The interior of the housing 4 is divided into three mutually isolated chambers: an exhaust chamber 401, an air intake chamber 402, and an equipment chamber 403. This layout can effectively isolate different functional areas to avoid mutual interference. The weighing device 7 is arranged in the air intake chamber 402, and is connected to the air intake port 602 and the gas delivery device 3. This can ensure that the weighing device 7 is in a clean air intake environment, reduce pollution, and improve weighing accuracy. At the same time, the intake air flow can cool the weighing device 7. The air outlet 603 and the exhaust device 2 are connected to the exhaust chamber 401, which can effectively discharge the exhaust gas generated during the heating process to avoid affecting the measurement. The main control module 12 is arranged in a separate equipment chamber 403, isolated from the high temperature area, which can avoid the influence of high temperature on electronic components and extend the service life.

[0064] Preferably, see Figure 1 The exhaust cavity 401 is an annular cavity arranged around the heating tank body 6, and a plurality of air outlets 603 are evenly opened on the peripheral wall of the heating tank body 6 along the circumferential direction; The air inlet cavity 402 is located below the heating tank body 6 , and a plurality of air inlets 602 are formed on the bottom wall of the heating tank body 6 .

[0065] This design solves the problem of uneven airflow distribution in the heating tank body 6 by optimizing the structure of air intake and exhaust. The annular design of the exhaust cavity 401 and the uniform distribution of the air outlets 603 ensure uniform exhaust, help form a uniform airflow distribution, and prevent excessive local airflow. The position design of the air intake cavity 402 and the distribution of the air intake 602 are conducive to the uniform flow of air from bottom to top, ensuring the uniformity of air intake. In addition, the air intake cavity 402 is located below the heating tank body 6, and the air in the air intake cavity 402 can also be ejected from the gap between the tray 8 and the hole wall of the positioning through hole 601 to form a wind curtain around the sample cup 9, further reducing the risk of cross contamination.

[0066] Preferably, the tray 8 is cylindrical and its outer peripheral surface is polished, so that when the airflow flows through the gap between the tray 8 and the hole wall of the positioning through hole 601, no additional upward thrust is generated on the tray 8, thereby ensuring accurate weighing results.

[0067] Specifically, the exhaust cavity 401, as an annular cavity arranged around the heating tank body 6, can adopt various shapes and sizes. For example, the exhaust cavity 401 can be a circular, elliptical or polygonal annular structure, and its width can be adjusted according to the size of the heating tank body 6 and the expected air flow. The number and size of the air outlets 603 can also be optimized according to actual needs. Generally, 8-16 evenly distributed air outlets 603 can be set, and the diameter of each air outlet 603 can be between 5mm and 15mm.

[0068] The design of the air inlet cavity 402 can also have many variations. For example, the air inlet cavity 402 can be designed as a circular or polygonal cavity, and its height can be adjusted according to the size of the heating tank 6 and the expected air flow. The number and distribution of the air inlets 602 can also be optimized according to actual needs. Generally, 4-8 evenly distributed air inlets 602 can be set, and the diameter of each air inlet 602 can be between 10mm and 20mm.

[0069] This design not only solves the problem of uneven airflow distribution, but also brings a series of additional technical effects. Uniform airflow distribution helps to evenly heat and burn the sample, reduces the dust problem caused by excessive local airflow, and improves the accuracy of ash determination. At the same time, uniform airflow distribution also reduces the risk of cross-contamination between different samples and improves the reliability of simultaneous determination of multiple samples. In addition, this design also improves thermal efficiency, improves temperature control, and helps to extend the life of the equipment.

[0070] Furthermore, an air inlet connection port 405 and an air exhaust connection port 406 may be provided on the housing 4. The air inlet connection port 405 is communicated with the air inlet cavity 402 and is used to connect to the air delivery device 3. The air exhaust connection port 406 is communicated with the air exhaust cavity 401 and is used to connect to the exhaust device 2. Figure 1 , Figure 2 shown.

[0071] In some preferred embodiments, see Figure 1 , Figure 2 , the positioning through holes 601 and the weighing device 7 are evenly arranged around the central axis of the heating tank 6; An annular guide plate 404 is provided in the air inlet chamber 402, which is coaxially arranged with the heating tank body 6. The annular guide plate 404 divides the air inlet chamber 402 into a first air chamber 4021 and a second air chamber 4022. The weighing device 7 is located in the second air chamber 4022, and the air inlet 602 is connected to the second air chamber 4022. The first air chamber 4021 surrounds the second air chamber 4022 and is connected to the gas delivery device 3. The first air chamber 4021 has an annular channel (a in the figure) connected to the second air chamber 4022 on one side close to the second air chamber 4022. The width of the annular channel ( Figure 1The annular channel (in the middle) gradually decreases in the direction approaching the second air chamber 4022, and the outlet of the annular channel faces each weighing device 7.

[0072] The uniform arrangement of the positioning through holes 601 and the weighing device 7 can ensure that each sample cup 9 is heated evenly, which is beneficial to improving the measurement accuracy. The annular guide plate 404 divides the air inlet cavity 402 into a first air chamber 4021 and a second air chamber 4022, forming a channel for air flow. The first air chamber 4021 is connected to the air delivery device 3 to receive fresh air. The second air chamber 4022 is connected to the air inlet 602 to deliver air to the heating tank body 6. The annular channel connects the two air chambers, and its gradually decreasing width design can gradually increase the air flow rate, which is beneficial to the uniform distribution of air (and improve the cooling effect on the weighing device 7). The outlet of the annular channel is directly opposite to the weighing device 7, so that the input air flow can flow through each weighing device 7 to reliably cool the weighing device 7.

[0073] Furthermore, the air inlet 602 can be evenly arranged around the central axis of the heating tank body 6 and located on the inner side of the positioning through hole 601 (i.e., located between the central axis of the heating tank body 6 and the positioning through hole 601, such as Figure 2 As shown), after the airflow enters the tank from the middle of the bottom of the heating tank body 6, it flows evenly in the radial direction and is discharged from the air outlet 603 on the peripheral wall of the heating tank body 6. The radial outward airflow can further reduce the risk of cross contamination.

[0074] This design can ensure that the input airflow effectively cools the weighing device 7, ensures the measurement accuracy of the weighing device 7, and improves the accuracy and consistency of ash content measurement. At the same time, uniform air flow also helps prevent the sample from burning too violently and generating dust, thereby avoiding cross contamination between samples. By making the air flow radially outward, even if a sample generates dust, the dust is difficult to reach other samples, thereby further reducing the risk of cross contamination.

[0075] Specifically, the shape of the annular guide plate 404 can be conical, trumpet-shaped or other suitable shapes, and the material can be a metal or ceramic material that is resistant to high temperatures and has good thermal conductivity.

[0076] Specifically, the outlet of the annular channel can be designed as an annular outlet (such as Figure 1 As shown), or, the outlet of the annular channel is designed to be a plurality of small holes, each of which is directly opposite to a weighing device 7, and the diameter of the small hole can be set to 2mm-3mm.

[0077] Compared with the prior art, the solution of the present application has the following advantages: 1. The air distribution is more uniform, ensuring that the ash content of each sample cup 9 is measured under the same conditions, thereby improving the consistency of the measurement. 2. The effective cooling of the weighing device 7 improves the weighing accuracy, thereby improving the accuracy of the ash content measurement. 3. The uniform air flow helps prevent the sample from burning too violently and generating dust, reducing the risk of cross-contamination between samples. 4. The radially outward airflow in the heating trough 6 can further reduce the risk of cross-contamination. 5. The overall design works in conjunction with the structure of the heating trough 6 to improve the efficiency and reliability of the entire system.

[0078] Preferably, see Figure 3 A positioning groove 801 is provided at the bottom of the tray 8, and a heat-insulating positioning protrusion 701 adapted to the positioning groove 801 is provided at the top of the weighing device 7. The heat-insulating positioning protrusion 701 extends into the positioning groove 801 to position the tray 8.

[0079] The positioning groove 801 is arranged at the bottom of the tray 8, which can provide a stable positioning structure. The heat-insulating positioning protrusion 701 is arranged on the top of the weighing device 7, and is adapted to the positioning groove 801. This design can realize two functions: positioning function and heat-insulating function. The positioning function means that the heat-insulating positioning protrusion 701 extends into the positioning groove 801, which can accurately locate the position of the tray 8, avoid the friction between the tray 8 and the hole wall of the positioning through hole 601, and ensure the weighing accuracy. The heat-insulating function means that the heat-insulating positioning protrusion 701 can reduce the heat conduction between the tray 8 and the weighing device 7, and protect the weighing device 7 from high temperature.

[0080] This design can effectively isolate the influence of high temperature on the weighing device 7 while ensuring the stable positioning of the tray 8, thereby improving the measurement accuracy and equipment life. This structural design cleverly solves the problem of heat conduction between the tray 8 and the weighing device 7, while ensuring the accuracy of weighing.

[0081] Specifically, the positioning groove 801 can be designed to be circular, square or other geometric shapes to adapt to different structures of the tray 8 and the weighing device 7. The depth of the positioning groove 801 can be adjusted according to actual needs, for example, it can be set to 2mm-5mm. The diameter or side length of the positioning groove 801 can be designed according to the size of the tray 8, for example, it can be set to 10mm-30mm.

[0082] Preferably, the positioning groove 801 is in the shape of a truncated cone hole, and the heat insulation positioning protrusion 701 is correspondingly in the shape of a truncated cone. After the heat insulation positioning protrusion 701 extends into the positioning groove 801, there is a gap (such as Figure 3As shown); thereby, while ensuring stable positioning, the contact area between the tray 8 and the thermal insulation positioning protrusion 701 can be reduced, the heat transfer efficiency between the tray 8 and the thermal insulation positioning protrusion 701 can be reduced, and the heat conduction between the tray 8 and the weighing device 7 can be further reduced.

[0083] The heat-insulating positioning protrusion 701 can be made of a material that is resistant to high temperatures and has a low thermal conductivity, such as ceramics, polytetrafluoroethylene, and the like.

[0084] Furthermore, the heat-insulating positioning protrusion 701 can be designed as a hollow structure to further reduce heat conduction. The hollow structure can be filled with a heat-insulating material, such as aerogel or a vacuum layer, to further improve the heat-insulating effect.

[0085] As a preferred embodiment, an ultra-thin metal coating, such as a gold-plated layer, can be provided on the outer surface of the heat-insulating positioning bump 701. This coating can further improve the positioning accuracy, and at the same time, due to its extremely thin thickness (e.g., 0.01 mm-0.05 mm), it will not significantly increase heat conduction.

[0086] In some possible implementations, see Figure 4 The gas delivery device 3 includes a gas delivery pump 301, an oxygen tank 302 and an air filter 303. The oxygen tank 302 and the air filter 303 are both connected to the input port of the gas delivery pump 301 through a pipeline, and an electromagnetic flow valve 304 is respectively connected between the oxygen tank 302 and the gas delivery pump 301 and between the air filter 303 and the gas delivery pump 301; the air filter 303 is used to filter the external air and deliver it to the gas delivery pump 301, and the oxygen tank 302 is used to deliver oxygen to the gas delivery pump 301; the gas delivery pump 301 and the electromagnetic flow valve 304 are both electrically connected to the main control module 12, and the main control module 12 is also used to adjust the oxygen content of the air delivered to the tank cavity of the heating tank body 6 through the two electromagnetic flow valves 304.

[0087] The air filter 303 is used to filter the external air, and the oxygen tank 302 is used to provide pure oxygen. Both are connected to the input port of the gas pump 301 through a pipeline. An electromagnetic flow valve 304 is respectively arranged between the oxygen tank 302 and the gas pump 301, and between the air filter 303 and the gas pump 301. The main control module 12 can adjust the gas ratio input from the oxygen tank 302 and the air filter 303 to the gas pump 301 by controlling the opening of the two electromagnetic flow valves 304, thereby adjusting the oxygen content of the air finally delivered to the tank cavity of the heating tank body 6.

[0088] This design can flexibly adjust the oxygen concentration according to the combustion requirements of different plastic pipe samples, which can ensure sufficient combustion and avoid excessive combustion due to excessive oxygen. At the same time, the setting of the air filter 303 also ensures the cleanliness of the input gas and avoids the influence of external impurities on the test results. This adjustable gas delivery system improves the accuracy and applicability of ash content determination and provides a more flexible and reliable solution for ash content determination of different types of plastic pipes.

[0089] Among them, the gas delivery pump 301 can adopt various types, such as a centrifugal pump, a screw pump or a diaphragm pump. The selection of the gas delivery pump 301 needs to consider its gas delivery stability and adjustability. The oxygen tank 302 can be a high-pressure gas cylinder filled with pure oxygen. The air filter 303 can adopt a multi-stage filtering structure, including primary filtering, medium filtering and high-efficiency filtering, to ensure the cleanliness of the input air.

[0090] The electromagnetic flow valve 304 is a key component for achieving precise regulation. The electromagnetic flow valve 304 can be a model with high-precision control capability, for example, it can achieve continuous regulation within the range of 0-100%. The opening of the electromagnetic flow valve 304 can be controlled by an electrical signal sent by the main control module 12 to achieve real-time and precise flow regulation.

[0091] The electrical connection between the main control module 12 and the gas delivery pump 301 and the electromagnetic flow valve 304 can be achieved in a variety of ways, such as wired connection or wireless connection. The main control module 12 can automatically adjust the opening of the two electromagnetic flow valves 304 based on a preset control algorithm and according to the combustion characteristics of different plastic pipe samples, thereby achieving accurate control of the oxygen content of the input gas.

[0092] The technical solution of the present application can achieve multiple functions in practical applications. For example, in the early stage of combustion, the rapid ignition of the plastic pipe sample can be promoted by increasing the oxygen ratio. During the combustion process, the oxygen ratio can be dynamically adjusted according to the feedback of the temperature sensor 11 to maintain a stable combustion state. In the later stage of combustion, the oxygen ratio can be appropriately increased to ensure that the plastic pipe sample is fully burned.

[0093] Furthermore, the technical solution of the present application can also be combined with other features to produce better effects. For example, combined with the temperature control of the heating tank 6, the oxygen content of the input gas can be adjusted at different temperature stages to adapt to the combustion characteristics of different plastic materials at different temperatures. This combination can better control the combustion process and improve the accuracy of ash determination.

[0094] Furthermore, the heating furnace 1 is also provided with an input module 101 and a display 102, both of which are electrically connected to the main control module 12, the input module 101 is used to input heating control information (such as category information of each plastic pipe sample, which category information may be a name, model or number), and the display 102 is used to display heating information (such as a total heating curve and an actual heating curve, etc., the introduction of the total heating curve is described later) and measurement results.

[0095] refer to Figure 5 The present application also provides a determination method, based on the above-mentioned plastic pipe ash content determination instrument, comprising the steps of: A1. Place multiple empty sample cups 9 into multiple trays 8 and perform tare weight removal; A2. Place multiple plastic pipe samples into each sample cup 9, and obtain the initial weight of each plastic pipe sample; A3. Obtain a reference heating curve of each plastic pipe sample according to the category information of each plastic pipe sample; the reference heating curve includes a plurality of heating sections and a plurality of heat preservation sections; A4. Generate a total heating curve according to the reference heating curve of each plastic pipe sample; the total heating curve includes a plurality of heating sections and a plurality of insulation sections; wherein the heating rate of each heating section of the total heating curve is calculated according to the heating rate of the corresponding heating section in the reference heating curve of each plastic pipe sample, and the insulation temperature and insulation time of the insulation section of the total heating curve are calculated according to the insulation temperature and insulation time of the corresponding insulation section in the reference heating curve of each plastic pipe sample; A5. Control the temperature in the tank cavity of the heating tank 6 according to the total heating curve so that each plastic pipe sample is fully burned; A6. Obtain the ash weight of each plastic pipe sample after combustion, and calculate the ash content of each plastic pipe sample based on the ash weight and initial weight.

[0096] By developing a dedicated reference heating curve for each plastic pipe sample and then generating a total heating curve based on these reference heating curves, precise heating control of different types of samples is achieved. This method avoids the problem that a single heating curve may cause some samples to overheat and burn violently, thereby preventing the generation of dust.

[0097] Among them, the determination method of the present application first ensures the accuracy of the measurement by tare weight processing. This step eliminates the influence of the weight of the sample cup 9 itself on the measurement result, and provides accurate basic data for the subsequent ash content calculation. Tare weight processing is a prior art and will not be described in detail here.

[0098] The reference heating curve has a plurality of heating sections and a plurality of insulation sections. The temperature is increased at a constant heating rate in the heating section, and the temperature is kept constant for a certain period of time in the insulation section. Specifically, the number of heating sections and insulation sections, the heating rate of the heating section, the insulation temperature and the insulation time of the insulation section are set according to actual needs. The reference heating curves of the plastic pipes have the same number of heating sections and the same number of insulation sections. For example, Figure 6 The reference heating curve shown includes two heating sections and two insulation sections, wherein the oblique line section is the heating section and the straight line section is the insulation section. For example, the reference heating curves of various plastic pipes can be determined through experiments to ensure that when the oxygen content of the input gas is the reference oxygen content (for example, the oxygen content in the atmosphere is the reference oxygen content, or other specified oxygen content is the reference oxygen content), when heating is performed according to the reference heating curve, the corresponding type of plastic pipe will not generate dust during combustion.

[0099] The reference heating curves of various types of plastic pipes may be stored in a local database. In step A3, the corresponding reference heating curve is obtained by searching the local database according to the type information of each plastic pipe sample.

[0100] By using this segmented reference heating curve, the easily combustible substances in the plastic pipe sample can be burned first, and the difficult-to-burn substances can be burned later, thus avoiding the simultaneous combustion of various combustible substances, which would cause excessive combustion and generate dust.

[0101] The resulting total heating curve combines the heating requirements of all samples. This method not only adapts to the heating requirements of different types of plastic pipes, but also avoids overheating of samples while ensuring measurement efficiency. Specifically, the heating rates of each heating section of the total heating curve are calculated based on the heating rates of the corresponding heating sections in the reference heating curve of each plastic pipe sample. This may be calculated using an average value, a weighted average value, or other appropriate calculation methods. Similarly, the insulation temperature and insulation time of the insulation section of the total heating curve are also calculated based on the insulation temperature and insulation time of the corresponding insulation section in the reference heating curve of each plastic pipe sample.

[0102] As a possible implementation, in step A4, the heating rate of each heating section of the total heating curve can be selected as the minimum value of the heating rate of the corresponding heating section in the reference heating curve of each plastic pipe sample, so as to avoid the situation where all plastic pipe samples heat up too fast, the insulation temperature of each insulation section of the total heating curve can be set to the average insulation temperature of the corresponding insulation section in the reference heating curve of each plastic pipe sample, and the insulation time of each insulation section of the total heating curve can be selected as the maximum insulation time of the corresponding insulation section in the reference heating curve of each plastic pipe sample, so as to ensure that the combustible material is fully burned at each insulation temperature.

[0103] In step A5, the temperature in the cavity of the heating tank 6 is controlled according to the total heating curve, thereby achieving precise heating control of multiple samples. This control method can be achieved by adjusting the power of the heating device 10.

[0104] In some embodiments, in step A5, the temperature in the cavity of the heating trough body 6 can be controlled to change strictly according to the total heating curve. In this case, the oxygen content of the air input into the cavity of the heating trough body 6 is maintained at the reference oxygen content.

[0105] In some other embodiments, step A5 includes: In each heat preservation section of the total heating curve, the weight change rate of each plastic pipe sample is obtained, and the oxygen content of the air input into the tank cavity of the heating tank body 6 is adjusted according to the weight change rate.

[0106] In each insulation section, the weight measured by each weighing device 7 is obtained in real time, and the weight change rate of each plastic pipe sample can be calculated by taking the derivative of the measured weight with respect to time. In fact, in each insulation section, as the combustible material is consumed, the weight change rate of the plastic pipe sample will gradually decrease. A first weight change rate threshold value can be preset (specifically set according to actual needs). When the weight change rate of all plastic pipe samples is less than the first weight change rate threshold value, the oxygen content of the air input into the tank cavity of the heating tank body 6 can be increased to increase the combustion rate, until the weight change rate of all plastic pipe samples is less than the second weight change rate threshold value (the second weight change rate threshold value is less than the first weight change rate threshold value, specifically set according to actual needs) or the duration of the insulation section reaches the corresponding insulation time, then the insulation section is terminated.

[0107] When the weight change rate of the plastic pipe sample is less than the first weight change rate threshold, it means that the combustible material of the plastic pipe sample has been consumed more at the corresponding insulation temperature. At this time, increasing the oxygen content of the air can improve the consumption efficiency of the remaining combustible material, thereby shortening the insulation time and improving the measurement efficiency. Among them, the maximum oxygen content of various plastic pipe samples that can ensure that no dust is generated when the weight change rate is less than the first weight change rate threshold can be obtained in advance through experiments, recorded as the optimized oxygen content, and recorded in the local database. In step A5, the optimized oxygen content of each plastic pipe sample is queried in the local database according to the category information of each plastic pipe sample, and the minimum value is used as the target oxygen content. When the weight change rate of all plastic pipe samples is less than the first weight change rate threshold, the oxygen content of the air input into the slot cavity of the heating slot body 6 is increased to the target oxygen content (achieved by controlling the opening of the two electromagnetic flow valves 304), thereby shortening the insulation time and avoiding the generation of dust.

[0108] When the weight change rate of the plastic pipe sample is less than the second weight change rate threshold (the second weight change rate threshold is a small amount, which is set according to actual needs), it means that the combustible substances of the plastic pipe sample are basically consumed at the corresponding insulation temperature, so the insulation can be ended. For the last insulation section, heating can be stopped at this time.

[0109] Specifically, in step A6, after heating is stopped, the measured values ​​of each weighing device 7 are obtained to obtain the ash weight of each plastic pipe sample after combustion, and then the ash weight of each plastic pipe sample is divided by its initial weight to obtain the ash content of each plastic pipe sample.

[0110] Compared with the prior art, the technical solution of the present application has significant advantages. Traditional methods usually use fixed heating curves and air supplies, which are difficult to adapt to the characteristics of different plastic pipes and easily lead to unstable combustion processes. However, the present application flexibly adjusts the insulation time and the oxygen content of the air, which not only effectively solves the dust problem, but also improves the accuracy and efficiency of the measurement. Especially when it is necessary to measure multiple plastic pipe samples at the same time, the method of the present application can greatly reduce the risk of cross-contamination between samples and improve the reliability of batch measurement. This innovative method provides a more accurate and efficient solution for the determination of ash content in plastic pipes.

[0111] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0112] In addition, the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, and may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0113] Furthermore, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0114] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0115] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A plastic pipe ash content measuring instrument, comprising a heating furnace (1), an exhaust device (2) and a gas transmission device (3); characterized in that: The heating furnace (1) comprises a shell (4) and a top cover (5); a heating trough (6) is arranged on the top of the shell (4); a plurality of positioning through holes (601) are opened on the bottom of the heating trough (6); a weighing device (7) is arranged below each of the positioning through holes (601); a tray (8) is placed on each of the weighing devices (7); the upper end of the tray (8) passes through the corresponding positioning through hole (601); and a gap is provided between the tray (8) and the hole wall of the positioning through hole (601); the tray (8) is used to support a sample cup (9); and the sample cup (9) is used to load a plastic pipe sample; The top cover (5) is rotatably connected to the top of the shell (4), and a heating device (10) is provided on a side facing the top of the shell (4), wherein the heating device (10) is used to heat the groove cavity of the heating groove body (6); The heating tank body (6) is provided with a temperature sensor (11) and has an air inlet (602) and an air outlet (603); the temperature sensor (11) is used to measure the temperature in the tank cavity of the heating tank body (6); the air inlet (602) is connected to the air supply device (3), and the air outlet (603) is connected to the exhaust device (2); the air supply device (3) is used to supply air to the tank cavity of the heating tank body (6), and the exhaust device (2) is used to discharge the air in the tank cavity of the heating tank body (6) out of the heating furnace (1); A main control module (12) is also provided in the housing (4); the weighing device (7), the heating device (10), the temperature sensor (11), the exhaust device (2) and the gas supply device (3) are all electrically connected to the main control module (12); the main control module (12) is used to adjust the power of the heating device (10) according to the measurement result of the temperature sensor (11) to control the temperature in the tank cavity of the heating tank body (6), and calculate the ash content of each plastic pipe sample according to the weighing result of the weighing device (7).

2. The plastic pipe ash content measuring instrument according to claim 1, characterized in that: The heating trough body (6), the tray (8) and the sample cup (9) are made of high-temperature resistant ceramics, graphite, polytetrafluoroethylene or corundum; and a heat insulating layer (604) is provided on the outer wall surface of the heating trough body (6).

3. The plastic pipe ash content measuring instrument according to claim 1, characterized in that: A cover (13) made of the same material as the heating trough (6) is arranged on the side of the top cover (5) facing the top of the shell (4); the heating device (10) is arranged in the middle of the cover (13); an annular protrusion (605) protruding from the top of the shell (4) is arranged at the upper end of the heating trough (6); an annular groove (1301) matching the annular protrusion (605) is arranged on the side of the cover (13) facing the top of the shell (4); when the top cover (5) covers the top of the shell (4), the annular protrusion (605) and the annular groove (1301) are nested with each other.

4. The plastic pipe ash content measuring instrument according to claim 1, characterized in that: The housing (4) comprises an exhaust cavity (401), an air intake cavity (402) and an equipment cavity (403) which are isolated from each other; the weighing device (7) is arranged in the air intake cavity (402); the air intake port (602) and the air delivery device (3) are both connected to the air intake cavity (402); the air outlet port (603) and the exhaust device (2) are both connected to the exhaust cavity (401); and the main control module (12) is arranged in the equipment cavity (403).

5. The plastic pipe ash content measuring instrument according to claim 4, characterized in that: The exhaust cavity (401) is an annular cavity arranged around the heating trough body (6), and a plurality of the exhaust ports (603) are evenly arranged on the peripheral wall of the heating trough body (6) along the circumferential direction; The air inlet cavity (402) is located below the heating trough body (6), and a plurality of air inlets (602) are provided on the bottom wall of the heating trough body (6).

6. The plastic pipe ash content measuring instrument according to claim 5, characterized in that: The positioning through holes (601) and the weighing device (7) are evenly arranged around the central axis of the heating tank body (6); An annular flow guide plate (404) coaxially arranged with the heating tank body (6) is arranged in the air inlet cavity (402), and the annular flow guide plate (404) divides the air inlet cavity (402) into a first air chamber (4021) and a second air chamber (4022); the weighing device (7) is located in the second air chamber (4022), and the air inlet (602) is connected to the second air chamber (4022); the first air chamber (4021) surrounds the second air chamber (4022) and is connected to the gas delivery device (3); a side of the first air chamber (4021) close to the second air chamber (4022) has an annular channel connected to the second air chamber (4022), the width of the annular channel gradually decreases in a direction close to the second air chamber (4022), and an outlet of the annular channel faces each of the weighing devices (7).

7. The plastic pipe ash content measuring instrument according to claim 1, characterized in that: The bottom of the tray (8) is provided with a positioning groove (801), and the top of the weighing device (7) is provided with a heat-insulating positioning protrusion (701) adapted to the positioning groove (801), and the heat-insulating positioning protrusion (701) extends into the positioning groove (801) to position the tray (8).

8. The plastic pipe ash content measuring instrument according to claim 1, characterized in that: The gas delivery device (3) comprises a gas delivery pump (301), an oxygen tank (302) and an air filter (303); the oxygen tank (302) and the air filter (303) are both connected to the input port of the gas delivery pump (301) through a pipeline, and an electromagnetic flow valve (304) is respectively connected between the oxygen tank (302) and the gas delivery pump (301) and between the air filter (303) and the gas delivery pump (301); the air filter (303) is used to filter external air and deliver it to the gas delivery pump (301), and the oxygen tank (302) is used to deliver oxygen to the gas delivery pump (301); the gas delivery pump (301) and the electromagnetic flow valve (304) are both electrically connected to the main control module (12), and the main control module (12) is also used to adjust the oxygen content of the air delivered to the tank cavity of the heating tank body (6) through the two electromagnetic flow valves (304).

9. A determination method, characterized in that: The plastic pipe ash content measuring instrument according to any one of claims 1 to 8 comprises the following steps: A1. Place a plurality of empty sample cups (9) into the plurality of trays (8) and perform tare weight removal; A2. Place a plurality of plastic pipe samples into each of the sample cups (9), and obtain the initial weight of each of the plastic pipe samples; A3. Obtaining a reference heating curve of each plastic pipe sample according to the category information of each plastic pipe sample; the reference heating curve includes a plurality of heating sections and a plurality of heat preservation sections; A4. Generate a total heating curve according to the reference heating curves of the plastic pipe samples; the total heating curve includes a plurality of heating sections and a plurality of insulation sections; wherein the heating rate of each heating section of the total heating curve is calculated according to the heating rate of the corresponding heating section in the reference heating curve of each plastic pipe sample, and the insulation temperature and insulation time of the insulation section of the total heating curve are calculated according to the insulation temperature and insulation time of the corresponding insulation section in the reference heating curve of each plastic pipe sample; A5. Controlling the temperature in the tank cavity of the heating tank (6) according to the total heating curve so that each of the plastic pipe samples can be fully burned; A6. Obtain the ash weight of each of the plastic pipe samples after combustion, and calculate the ash content of each of the plastic pipe samples based on the ash weight and the initial weight.

10. The measuring method according to claim 9, characterized in that Step A5 includes: In each heat preservation section of the total heating curve, the weight change rate of each plastic pipe sample is obtained, and the oxygen content of the air input into the tank cavity of the heating tank body (6) is adjusted according to the weight change rate.

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