Microwave double-transmission-link channel applied to natural latex dry content detection

Abstract

The invention discloses a microwave dual-transmission link channel applied to natural latex dry content detection, which is characterized in that a fixed attenuation verification channel is additionally arranged on the basis of a waveguide channel to form a microwave dual-transmission link, two paths of microwave signals can be transmitted at the same time, the signal processing efficiency and flexibility are improved, and by detecting the numerical difference value of the two links, the detection accuracy is improved. A microwave attenuation detection result of a sample is verified and modified so as to prevent the influence of microwave source temperature drift on a final detector, in addition, a lofting assembly matched with a funnel is additionally arranged in a shell, when latex sample detection work is carried out, a stirring conveying assembly in the funnel stirs the latex sample and conveys the latex sample downwards in a spiral mode, and the detection efficiency is improved. In the process, the sample placing box is gradually pushed from inside to outside, the equal amount of latex samples are injected into the sample placing cylinders in sequence, multiple sets of samples are additionally arranged, the latex samples are repeatedly detected for multiple times in a short time, and the detection accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the field of microwave transmission technology, and more particularly to a microwave dual transmission link channel used for detecting dry content in natural latex. Background Art

[0002] In the field of rubber applications, measuring the dry content of latex is a relatively important matter. The standard method of measurement is to dry the water in the sample and weigh it to calculate the dry content through a series of operations. However, it is time-consuming and cumbersome to operate, and is not suitable for scenarios where large quantities of samples are measured.

[0003] In the prior art, microwave transmission technology is used to detect the dry content of latex. The water content of the latex sample is determined by measuring the absorption of microwave signals by the latex sample, taking advantage of the fact that water absorbs microwave signals much more than other substances.

[0004] However, this single-channel detection method will cause errors in the microwave attenuation rate of the sample due to temperature fluctuations during the detection process, resulting in the inability to eliminate temperature drift interference in the detection results and low accuracy. In addition, the detection work is mostly carried out by funneling latex, and only a single test can be performed on the latex sample. When the latex uniformity does not meet the standard, it is easy to cause detection errors. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that the microwave attenuation rate of the sample will produce errors with temperature fluctuations during the detection process using the existing single-channel microwave detection method. Compared with the existing technology, a microwave dual transmission link channel is provided for the detection of dry content of natural latex.

[0006] The object of the present invention can be achieved by the following technical solution: a microwave dual transmission link channel applied to the detection of dry content of natural latex comprises a housing with a cover plate, wherein a microwave generator, a detector and a waveguide box installed between the two are installed inside the housing;

[0007] The output end of the microwave generator is connected to a fixed attenuator, and a set of calibration channels is formed by the microwave generator, the fixed attenuator, and the detector. A set of waveguide channels is formed by the microwave generator, the waveguide box, and the detector. The detector is connected to an ADC module through a single-mode optical fiber.

[0008] The waveguide box is provided with a sample placement hole, the cover plate is provided with a funnel which passes through the sample placement hole and extends into the waveguide box, a sample placement assembly is slidably installed inside the waveguide box, the funnel is located below the sample placement hole and is adapted to the bottom end of the funnel, the funnel comprises a bucket-shaped portion and a straight tube portion arranged above and below, the lower end of the straight tube portion passes through the cover plate and the sample placement hole in sequence and is threadedly connected to a flow guide pipe port, and a stirring and conveying assembly is provided inside the funnel;

[0009] The lofting assembly includes a lofting box, which is provided with a plurality of lofting grooves, a lofting tube is sleeved inside the lofting grooves, and a sealing plate is commonly connected to the top ends of the plurality of lofting tubes. The sealing plate is provided with a plurality of lofting holes that are connected to the interior of the lofting tube and adapted to the guide pipe opening. The shell and the end of the waveguide box are respectively provided with an outer window and an inner window that are connected to the inside and outside and adapted to the lofting box.

[0010] Furthermore, a power splitter is connected between the microwave generator and the fixed attenuator, and an isolator is connected between the fixed attenuator and the waveguide box, and between the waveguide box and the detector.

[0011] Furthermore, the ADC module is communicatively connected to an MCU processor, which controls the microwave generator as a microwave source to emit microwaves. The microwaves pass through a fixed attenuator and a sample, and are then processed by a detector to obtain a sample detection result. The MCU processor receives the sample detection result transmitted by the detector and sends the sample detection result to the touch display screen.

[0012] Furthermore, the process of obtaining the sample detection result includes:

[0013] First, obtain the nominal attenuation of the fixed attenuator in the calibration channel and mark it as A1. The actual attenuation of the fixed attenuator in the calibration channel will be affected by temperature and produce a temperature drift variable, which is marked as Td. The detector obtains the output value B1 in the calibration channel, B1 = A1 + Td;

[0014] Similarly, the sample attenuation in the waveguide channel is marked as A2, and the output value B2 in the waveguide channel is obtained by the detector, B2=A2+Td. As the temperature changes, the attenuation difference of the same sample in the two channels is calculated as Delta=B2-B1=(A2+Td)-(A1+Td)=A2-A1. According to the relationship between attenuation and latex content, the calculation formula for the sample attenuation A2 can be obtained as A2=B2-B1+A1.

[0015] Furthermore, the stirring and conveying assembly includes a rotating shaft rotatably installed on the top of the bucket-shaped portion, and a plurality of groups of stirring rods distributed up and down are provided on the outer end wall of the rotating shaft. The outer ends of the stirring rods arranged up and down are fixed with scrapers that movably fit with the inner wall of the bucket-shaped portion, and the bottom end of the rotating shaft is threadedly sleeved with a spiral conveying piece extending to the inside of the straight pipe portion, and the top of the bucket-shaped portion is fixed with a driving motor that rotates the rotating shaft.

[0016] Furthermore, the lower end of the straight pipe portion sequentially passes through the cover plate and the sample placement hole and is threadedly connected to a guide pipe opening that contacts and fits with the sample placement hole.

[0017] Furthermore, a weighing sensor for supporting the lofting tube is provided at the bottom of each lofting groove, and the upper end wall of the sealing plate is movably fitted with the bottom end of the guide pipe opening.

[0018] Furthermore, a pushing component is installed at the bottom of the waveguide box, which is embedded in the layout box and is used to push the layout box horizontally. The pushing component includes a U-shaped docking plate slidably installed inside the waveguide box and a pair of linear drive motors fixedly installed inside the waveguide box and horizontally driving the left and right ends of the U-shaped docking plate respectively.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] (1) Based on the waveguide channel, this scheme adds a fixed attenuation calibration channel to form a microwave dual transmission link, which can transmit two microwave signals at the same time, improving the efficiency and flexibility of signal processing. By detecting the numerical difference between the two links, the microwave attenuation detection results of the sample are verified and corrected, which can prevent the power jitter introduced by the temperature drift of the microwave source from affecting the final detector.

[0021] (2) This solution adds a sample placement component that is compatible with the bottom of the funnel in the shell. When conducting latex sample testing, the latex sample is stirred by the stirring and conveying component in the funnel and continuously spirally conveyed downward. During this process, the sample placement box is pushed from the inside to the outside one by one, so that multiple sample placement holes correspond to the bottom of the guide pipe mouth in turn, and equal amounts of latex samples are injected from the funnel into multiple sample placement tubes. After each injection of the latex sample into the sample placement tube, a waveguide detection of a specific route is performed. By adding multiple groups of samples, the latex sample can be repeatedly tested multiple times in a short time to improve the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the external structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the present invention when the cover plate is disassembled upwards;

[0024] Figure 3 It is the operating principle diagram of the present invention;

[0025] Figure 4 This is a schematic structural diagram of the present invention before the lofting assembly is placed in the waveguide box;

[0026] Figure 5 It is a partial cross-sectional view of the housing and waveguide box of the present invention;

[0027] Figure 6 is an internal cross-sectional view of the funnel of the present invention;

[0028] Figure 7It is an internal cross-sectional view of the present invention when the spiral conveying sheet is disassembled downward;

[0029] Figure 8 An exploded view of the lofting assembly of the present invention;

[0030] Figure 9 is an internal cross-sectional view of the lofting assembly of the present invention;

[0031] Figure 10 It is an internal cross-sectional view of the present invention during lofting detection.

[0032] Description of the numbers in the figure:

[0033] 1. Shell; 101. Cover; 102. Outer window; 2. Waveguide box; 201. Inner window; 3. Microwave generator; 4. Power divider; 5. Fixed attenuator; 6. Detector; 7. Isolator; 8. Funnel; 81. Bucket-shaped portion; 82. Straight pipe portion; 821. Diversion pipe outlet; 83. Drive motor; 84. Rotating shaft; 85. Stirring rod; 86. Scraper; 87. Spiral conveyor; 9. Lofting box; 901. Lofting trough; 902. Weighing sensor; 10. Lofting tube; 11. Sealing plate; 111. Lofting hole; 12. U-shaped docking plate; 13. Linear drive motor. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work shall fall within the scope of protection of the present invention.

[0035] In the field of rubber applications, measuring the dry content of latex is a relatively important matter. The present invention determines the water content of the sample by comparing the microwave absorption of the sample based on the characteristic that water absorbs microwaves much more than other substances. That is, the water content of the latex is calculated based on the relationship between attenuation and latex content.

[0036] Example 1: The present invention discloses a microwave dual transmission link channel for natural latex dry content detection, please refer to Figure 1 、 Figure 2 , comprising a housing 1 with a cover plate 101, wherein a microwave generator 3, a detector 6 and a waveguide box 2 installed therebetween are installed inside the housing 1, a fixed attenuator 5 is connected to the output end of the microwave generator 3, the microwave generator 3, the fixed attenuator 5 and the detector 6 form a set of calibration channels, and the microwave generator 3, the waveguide box 2 and the detector 6 form a set of waveguide channels;

[0037] The detector 6 is connected to the ADC module through a single-mode optical fiber. A power divider 4 is also connected between the microwave generator 3 and the fixed attenuator 5. An isolator 7 is also connected between the fixed attenuator 5 and the waveguide box 2, as well as between the waveguide box 2 and the detector 6. A sample placement hole is provided on the waveguide box 2. A funnel 8 is inserted on the cover plate 101, which passes through the sample placement hole and extends into the waveguide box 2. The latex sample is injected into the waveguide box 2 through the funnel 8 for waveguide detection.

[0038] See also Figure 3 The ADC module is communicatively connected to the MCU processor. The MCU processor controls the microwave generator 3 as a microwave source to emit microwaves. The microwaves pass through the fixed attenuator 5 and the sample, and then are processed by the detector 6 to obtain the sample detection result. The MCU processor receives the sample detection result transmitted by the detector 6 and sends the sample detection result to the touch screen;

[0039] The process of obtaining the sample detection results includes:

[0040] First, the nominal attenuation of the fixed attenuator 5 in the calibration channel is obtained and marked as A1. The actual attenuation of the fixed attenuator 5 in the calibration channel is affected by temperature and produces a temperature drift variable, which is marked as Td. The output value B1 in the calibration channel is obtained by the detector 6, where B1 = A1 + Td.

[0041] Similarly, the sample attenuation in the waveguide channel is marked as A2, and the output value B2 in the waveguide channel is obtained by the detector 6. B2 = A2 + Td. As the temperature changes, the attenuation difference of the same sample in the two channels is calculated as Delta = B2 - B1 = (A2 + Td) - (A1 + Td) = A2 - A1. Based on the relationship between attenuation and latex content, the calculation formula for the sample attenuation A2 can be obtained as A2 = B2 - B1 + A1.

[0042] The microwave emitter 3 generates microwaves which pass through the fixed attenuator 5 and the sample respectively, and then pass through the detector 6 to obtain the detection result. The verification channel composed of the microwave emitter 3, the fixed attenuator 5 and the detector 6 verifies and corrects the microwave attenuation detection result of the sample, thereby improving the accuracy of the detection result. At the same time, the microwave dual-channel detection method avoids the problem of single-channel preheating. The Delta value of the same sample does not change with temperature. In this way, the temperature rise process can be bypassed, and the detection can be carried out directly without preheating after startup, thereby accelerating the efficiency of natural latex dry content detection.

[0043] This method is based on the characteristic that water absorbs microwaves much more than other substances. The water content of the sample is determined by comparing the sample's absorption of microwaves. That is, based on the relationship between attenuation and latex content, the water content of the latex can be calculated.

[0044] On the basis of the waveguide channel, a fixed attenuation calibration channel is added to form a microwave dual transmission link, which can transmit two microwave signals simultaneously, improving the efficiency and flexibility of signal processing. By detecting the numerical difference between the two links, the microwave attenuation test results of the sample are verified and corrected, which can prevent the power jitter introduced by the temperature drift of the microwave source from affecting the final detector.

[0045] Example 2: Based on Example 1, this example optimizes the detection process of latex samples as follows:

[0046] See also Figure 4 、 Figure 5 The waveguide box 2 is internally slidably mounted with a sample placement component located below the sample placement hole and adapted to the bottom end of the funnel 8. Figure 5-Figure 7 The funnel 8 includes a bucket-shaped portion 81 and a straight tube portion 82 arranged above and below. The lower end of the straight tube portion 82 passes through the cover plate 101 and the sample placement hole in sequence and is threadedly connected to a guide pipe port 821. A stirring and conveying component is provided inside the funnel 8.

[0047] The stirring and conveying assembly includes a rotating shaft 84 rotatably mounted on the top of the bucket-shaped portion 81. A plurality of stirring rods 85 are provided on the outer end wall of the rotating shaft 84. The outer ends of the stirring rods 85 are fixed with scraping strips 86 that movably fit the inner wall of the bucket-shaped portion 81. The bottom end of the rotating shaft 84 is threadedly sleeved with a spiral conveying piece 87 that extends into the interior of the straight tube portion 82. The top end of the bucket-shaped portion 81 is fixed with a drive motor 83 that rotates the rotating shaft 84.

[0048] After the sample box 9 and the funnel 8 are installed, the latex sample to be tested is injected into the bucket-shaped portion 81, and the drive motor 83 is started. The drive motor 83 is used to stir the latex sample in the bucket-shaped portion 81, and during the stirring process, the rotating spiral conveying piece 87 is used to continuously convey the latex sample downward to the inside of the waveguide box 2 for microwave detection. The spiral conveying piece 87 not only plays a conveying role, but also plays a certain stirring role, thereby improving the uniformity of the latex sample.

[0049] A plurality of triangular plug-in blocks are fixedly connected to the outer end wall of the straight tube portion 82, and a plurality of embedding grooves for embedding the triangular plug-in blocks are opened on the end wall of the cover plate 101 to improve the stability of the funnel 8 installed on the cover plate 101. The guide pipe mouth 821 is threadedly connected to the bottom end of the straight tube portion 82. The guide pipe mouth 821 has a conical structure that is wide at the top and narrow at the bottom. After the single batch inspection is completed, the guide pipe mouth 821 can be rotated downward, and then the bottom end of the spiral conveying piece 87 can be held and slowly rotated to separate the top end from the rotating shaft 84, so as to facilitate deep cleaning of the spiral conveying piece 87 and the inside of the straight tube portion 82.

[0050] See also Figure 4 、 Figure 5The housing 1 and the waveguide box 2 are provided with an outer window 102 and an inner window 201 at the ends thereof, which are connected to the inside and outside and adapted to the lofting assembly. Figures 8-10 The lofting assembly includes a lofting box 9, which is provided with a plurality of lofting grooves 901. A lofting tube 10 is sleeved inside the lofting groove 901. The tops of the plurality of lofting tubes 10 are commonly connected to a sealing plate 11. The sealing plate 11 is provided with a plurality of lofting holes 111 that are connected to the interior of the lofting tube 10 and are adapted to the guide pipe opening 821.

[0051] A weighing sensor 902 is provided at the bottom of each lofting groove 901 for supporting the lofting tube 10. The upper end wall of the sealing plate 11 is movably fitted with the bottom end of the guide pipe port 821. A pushing assembly is installed at the bottom of the waveguide box 2, which is embedded with the lofting box 9 and is used to push the lofting box 9 horizontally. The pushing assembly includes a U-shaped docking plate 12 slidably mounted inside the waveguide box 2 and a pair of linear drive motors 13 fixedly mounted inside the waveguide box 2 and horizontally driving the left and right ends of the U-shaped docking plate 12 respectively.

[0052] The left and right sides of the sample box 9 near the bottom are provided with embedding strips, and the opposite end walls of the U-shaped docking plate 12 are provided with embedding cavities for the embedding strips to be frictionally embedded. A U-shaped docking plate 12 is added below the sample placement hole and can slide horizontally left and right along the inner bottom wall of the waveguide box 2;

[0053] Before testing, the staking box 9 with multiple staking tubes 10 is pushed into the interior of the waveguide box 2 through the outer window 102 and the inner window 201. The embedded strips on both sides of the staking box 9 slide in the embedded cavity of the U-shaped docking plate 12 until the inner end of the staking box 9 abuts against the inner end of the U-shaped docking plate 12, achieving frictional contact between the two. At this time, the linear drive motor 13 is used to push the U-shaped docking plate 12 with the staking box 9 installed toward the inside of the waveguide box 2 until the outermost staking hole 111 corresponds to the bottom end of the guide pipe opening 821.

[0054] The driving motor 83 on the funnel 8 is started, and the latex sample is quantitatively transported downward into the sample tube 10 by the rotating spiral conveying piece 87. After the weighing sensor 902 in the sample box 9 detects the preset mass of the latex sample, the sample box 9 is pushed from the inside to the outside, and the guide pipe opening 821 contacts the upper end surface of the sealing plate 11, thereby sealing the lower end of the guide pipe opening 821. When the driving motor 83 is turned off, the latex in the funnel 8 stops flowing downward.

[0055] During this process, the latex sample in the sample tube 10 is detected by waveguide technology. After the detection is completed, the sample box 9 is pushed outward until the next sample hole 111 corresponds to the position of the guide pipe mouth 821. This cycle is repeated many times to realize the injection of equal amounts of latex samples from the funnel 8 into multiple sample tubes 10. After each injection of the latex sample into the sample tube 10, microwave detection of a specific route is performed. By adding multiple groups of samples and obtaining the average value of the sample attenuation A2, the latex sample can be repeatedly detected multiple times in a short period of time to improve the detection accuracy.

[0056] After the single batch inspection work is completed, the linear drive motor 13 is used to push the sample box 9 outward, and the sample box 9 is pulled outward and detached through the outer window 102 and the inner window 201, and the funnel 8 is detached upward, and the funnel 8 and the sample box 9 can be cleaned and replaced for the next sample inspection.

[0057] In summary, this solution adds a fixed attenuation calibration channel to the waveguide channel to form a microwave dual transmission link. It can transmit two microwave signals simultaneously, improving the efficiency and flexibility of signal processing. By detecting the numerical difference between the two links, the microwave attenuation test results of the sample are verified and corrected, effectively reducing the impact of temperature changes on circuit performance and improving the stability of signal transmission. The microwave signal enters the circuit through the input port and is divided into two signals for transmission after preliminary processing.

[0058] Among them, one signal from the fixed attenuation calibration channel is used as the reference signal, and the other signal from the waveguide channel is used as the actual transmitted signal. The reference signal and the actual signal will experience different degrees of attenuation and phase change during transmission. By measuring the numerical difference between the two signals, the attenuation and phase change experienced by the actual signal can be calculated, thereby performing calibration to prevent the power jitter introduced by the temperature drift of the microwave source from affecting the final detector.

[0059] By adding a sample-laying component that is compatible with the bottom end of the funnel 8 in the shell 1, when conducting latex sample testing, the latex sample is stirred and continuously spirally conveyed downward by the stirring and conveying component in the funnel 8 to improve the uniformity of the latex sample. During the latex sample conveying process, the sample-laying box 9 is pushed from the inside to the outside one by one, so that the multiple sample-laying holes 111 correspond to the bottom end of the guide pipe mouth 821 in succession, and the funnel 8 is used to inject equal amounts of latex samples into the interior of the multiple sample-laying tubes 10. After each injection of the latex sample into the sample-laying tube 10, a waveguide detection of a specific route is performed. By adding multiple groups of samples, the latex sample can be repeatedly tested multiple times in a short time to improve the detection accuracy.

[0060] The above are only preferred specific implementation methods of the present invention; however, the protection scope of the present invention is not limited thereto; any technician familiar with the technical field within the technical scope disclosed by the present invention; any equivalent replacement or change based on the technical solution and improved conception of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A microwave dual transmission link channel for detecting dry content of natural latex, comprising a housing (1) with a cover (101), a microwave generator (3), a detector (6) and a waveguide box (2) installed therebetween, characterized in that: The output end of the microwave generator (3) is connected to a fixed attenuator (5); the microwave generator (3), the fixed attenuator (5), and the detector (6) form a set of calibration channels; the microwave generator (3), the waveguide box (2), and the detector (6) form a set of waveguide channels; the detector (6) is connected to an ADC module via a single-mode optical fiber; The waveguide box (2) is provided with a sample placement hole, the cover plate (101) is provided with a funnel (8) penetrating the sample placement hole and extending into the waveguide box (2), a sample placement component adapted to the bottom end of the funnel (8) is slidably mounted inside the waveguide box (2), the funnel (8) comprises a bucket-shaped portion (81) and a straight tube portion (82) arranged upper and lower, and a stirring and conveying component is provided inside the funnel (8); The lofting assembly comprises a lofting box (9) provided with a plurality of lofting grooves (901), a lofting tube (10) being sleeved inside the lofting grooves (901), a sealing plate (11) being commonly connected to the top ends of the plurality of lofting tubes (10), and a plurality of lofting holes (111) being provided on the sealing plate (11) and being communicated with the interior of the lofting tubes (10) and being adapted to the bottom end of the straight tube portion (82).

2. The microwave dual transmission link channel for natural latex dry content detection according to claim 1 is characterized in that: A power divider (4) is further connected between the microwave generator (3) and the fixed attenuator (5), and an isolator (7) is further connected between the fixed attenuator (5) and the waveguide box (2), and between the waveguide box (2) and the detector (6).

3. The microwave dual transmission link channel for natural latex dry content detection according to claim 2 is characterized in that: The ADC module is communicatively connected to an MCU processor. The MCU processor controls the microwave generator (3) as a microwave source to emit microwaves. The microwaves pass through a fixed attenuator (5) and a sample, and are then processed by a detector (6) to obtain a sample detection result. The MCU processor receives the sample detection result transmitted by the detector (6) and sends the sample detection result to the touch display screen.

4. The microwave dual transmission link channel for natural latex dry content detection according to claim 3 is characterized in that: The process of obtaining the sample detection result includes: First, the nominal attenuation of the fixed attenuator (5) in the calibration channel is obtained and marked as A1. The actual attenuation of the fixed attenuator (5) in the calibration channel will be affected by temperature and produce a temperature drift variable, which is marked as Td. The output value B1 in the calibration channel is obtained by the detector (6), B1 = A1 + Td; Similarly, the sample attenuation in the waveguide channel is marked as A2, and the output value B2 in the waveguide channel is obtained by the detector (6), B2=A2+Td. As the temperature changes, the attenuation difference of the same sample in the two channels is calculated as Delta=B2-B1=(A2+Td)-(A1+Td)=A2-A1. According to the relationship between attenuation and latex content, the calculation formula for the sample attenuation A2 can be obtained as A2=B2-B1+A1.

5. The microwave dual transmission link channel for natural latex dry content detection according to claim 1 is characterized in that: The stirring and conveying assembly comprises a rotating shaft (84) rotatably mounted on the top of the bucket-shaped portion (81); a plurality of groups of stirring rods (85) distributed vertically are provided on the outer end wall of the rotating shaft (84); a scraper (86) movably fitted with the inner wall of the bucket-shaped portion (81) is fixed to the outer ends of the stirring rods (85) arranged vertically; a spiral conveying piece (87) extending into the interior of the straight pipe portion (82) is threadedly sleeved on the bottom end of the rotating shaft (84); and a driving motor (83) for rotating and driving the rotating shaft (84) is fixed to the top end of the bucket-shaped portion (81).

6. The microwave dual transmission link channel for natural latex dry content detection according to claim 5 is characterized in that: The lower end of the straight pipe portion (82) sequentially passes through the cover plate (101) and the sample placement hole and is threadedly connected to a guide pipe opening (821) that is compatible with the sample placement hole (111).

7. The microwave dual transmission link channel for natural latex dry content detection according to claim 6 is characterized in that: The bottom of each of the lofting grooves (901) is provided with a weighing sensor (902) for supporting the lofting tube (10).

8. The microwave dual transmission link channel for natural latex dry content detection according to claim 1 is characterized in that: The bottom of the waveguide box (2) is provided with a pushing assembly embedded with the lofting box (9) and used to push the lofting box (9) horizontally. The pushing assembly comprises a U-shaped docking plate (12) slidably mounted inside the waveguide box (2) and a pair of linear drive motors (13) fixedly mounted inside the waveguide box (2) and respectively driving the left and right ends of the U-shaped docking plate (12) horizontally.

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