Drying device for soil sample preparation

Abstract

The utility model relates to the technical field of soil sample preparation drying, in particular to a drying device for soil sample preparation. The drying device comprises a drying mechanism, a conveyor, a plurality of drying trays and a controller, an air outlet of the drying mechanism outwards conveys hot air for drying the soil samples, a preset position in the horizontal direction of the conveyor is configured as a drying station, and the drying station is communicated with the air outlet; the plurality of drying trays are arranged at preset intervals in the conveying direction of the conveyor, and each drying tray is used for placing a soil sample; and the controller is used for controlling the conveyor to convey a preset distance when the soil sample of the current drying tray at the drying station is dried, so that the drying mechanism dries the soil sample of the next drying tray. By means of the drying device, soil samples on the multiple drying trays can be automatically dried one by one, assembly line drying operation of the soil samples is achieved, and cross contamination in the soil sample drying process can be effectively prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of soil sample preparation and drying, and particularly relates to a soil sample preparation and drying device. BACKGROUND

[0002] Sample drying is one of the key links in soil sample preparation, and its drying methods mainly include natural air drying, oven drying and microwave-assisted air drying. Natural air drying relies on natural environmental conditions, takes a long time and is greatly disturbed by external factors, and it is difficult to achieve efficient and stable drying effect. Oven drying has the advantages of precise temperature control and relatively fast drying speed, and is further divided into tunnel drying and box drying. Microwave-assisted air drying utilizes the characteristics of microwaves to make water molecules in the sample vibrate rapidly to generate heat and accelerate the drying process.

[0003] However, the traditional drying method has many drawbacks. For example, cross contamination between samples must be prevented during sample preparation, and because of the differences in the properties of various samples, the drying temperature requirement is high, and any slight deviation may affect the sample property analysis result. Therefore, a new automatic drying solution is urgently needed to meet the complex and stringent soil sample preparation requirements. SUMMARY

[0004] To solve the technical problem of preventing cross contamination of soil samples during drying, the utility model provides a soil sample preparation and drying device, which realizes pipeline drying operation of soil samples and can effectively prevent cross contamination of soil samples during drying.

[0005] The utility model embodiment provides a soil sample preparation and drying device, which comprises:

[0006] A drying mechanism, the air outlet of the drying mechanism externally conveying hot air for drying soil samples;

[0007] A conveyor, the preset position of the conveyor in the horizontal direction being configured as a drying station, and the drying station being in communication with the air outlet;

[0008] A plurality of drying trays, arranged at a preset interval along the conveying direction of the conveyor, and each drying tray being used for placing a soil sample;

[0009] A controller connected with the conveyor, and the controller being used for controlling the conveyor to convey the preset interval when the soil sample in the current drying tray at the drying station completes drying, so that the drying mechanism dries the soil sample in the next drying tray.

[0010] In an alternative embodiment, the drying mechanism comprises:

[0011] An air outlet pipe, the outlet of the air outlet pipe being configured as the air outlet;

[0012] A pneumatic control valve, the outlet of the pneumatic control valve being in communication with the inlet of the air outlet pipe;

[0013] The hot air pump is connected to the inlet of the air control valve.

[0014] In an alternative embodiment, the drying mechanism further comprises:

[0015] An air inlet cover is arranged on the air outlet, and an air outlet end of the air inlet cover is arranged close to the bottom of the drying tray of the drying station.

[0016] In an alternative embodiment, the drying mechanism further comprises:

[0017] An air outlet cover is arranged on the top of the drying tray of the drying station to collect the drying steam of the soil sample of the drying station and discharge it.

[0018] In an alternative embodiment, the device further comprises:

[0019] A humidity sensor is connected to the controller, and the humidity sensor is arranged on the steam discharge path of the drying station to detect the humidity of the soil sample of the drying station and output to the controller.

[0020] In an alternative embodiment, the device further comprises:

[0021] A limiting mechanism is arranged along the conveying direction of the conveyor to limit the plurality of drying trays and keep the plurality of drying trays at a preset interval.

[0022] In an alternative embodiment, the limiting mechanism comprises a plurality of limiting assemblies arranged at a preset interval, and each limiting assembly comprises:

[0023] A cylinder is arranged vertically;

[0024] A limiting block is arranged on the telescopic end of the cylinder;

[0025] A position sensor is arranged on the side of the limiting block away from the drying tray;

[0026] A solenoid valve is connected to the cylinder and the position sensor, and the solenoid valve is used to control the cylinder to perform an extension action when the position sensor detects that the corresponding drying tray is close.

[0027] In an alternative embodiment, the conveyor comprises:

[0028] A first belt feeder;

[0029] A second belt feeder is arranged parallel to the first belt feeder to form a drying channel between the first belt feeder and the second belt feeder;

[0030] At least one transmission shaft is connected to the first belt feeder and the second belt feeder;

[0031] The motor is connected with the transmission shaft.

[0032] In an alternative embodiment, the drying tray comprises:

[0033] The bottom plate has a hollow structure in the middle part;

[0034] A plurality of positioning members are installed on the upper surface of the bottom plate;

[0035] The bottom of the material box is provided with a plurality of air holes arranged in a dot matrix, and the material box is placed in the positioning space formed by the plurality of positioning members.

[0036] In an alternative embodiment, the drying station is arranged at the middle position of the conveyor, so that the conveying forward side of the drying station is configured as a drying storage station, and the conveying reverse side of the drying station is configured as a drying waiting station.

[0037] Compared with the prior art, the soil sample drying device has the following advantages:

[0038] The drying device comprises a drying mechanism, a conveyor, a plurality of drying trays and a controller, the air outlet of the drying mechanism externally conveys hot air for drying soil samples, the preset position of the conveyor in the horizontal direction is configured as a drying station, and the drying station is in communication with the air outlet; the plurality of drying trays are arranged at a preset interval along the conveying direction of the conveyor, and each drying tray is used for placing a soil sample; and the controller is used for controlling the conveyor to convey the preset interval when the soil sample in the current drying tray of the drying station is completed drying, so that the drying mechanism performs drying on the soil sample in the next drying tray. The soil samples in the plurality of drying trays can be automatically dried one by one through the drying device, the pipeline drying operation of the soil samples is realized, and cross contamination in the drying process of the soil samples can be effectively prevented. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0040] Figure 1 The structure diagram of the soil sample drying device provided by the embodiment of the present application is shown;

[0041] Figure 2 The structure diagram of the drying station provided by the embodiment of the present application is shown;

[0042] Figure 3The structure schematic diagram of the drying tray is provided for the embodiment of the utility model.

[0043] Figure 4 The structure schematic diagram of the limiting assembly is provided for the embodiment of the utility model.

[0044] Mark 1-drying mechanism, 2-conveyor, 3-first drying tray, 4-second drying tray, 5-third drying tray, 6-air outlet pipe, 7-air control valve, 8-air inlet cover, 9-exhaust cover, 10-humidity sensor, 11-limiting assembly, 12-air cylinder, 13-limiting block, 14-position sensor, 15-first belt feeder, 16-second belt feeder, 17-motor, 18-bottom plate, 19-positioning piece, 20-material box, 21-breathable hole, 22-through hole. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art belong to the protection scope of the embodiments of the utility model.

[0046] Please refer to Figure 1 , Figure 1 The structure schematic diagram of the soil sample drying device is provided for the embodiment of the utility model, and the drying device comprises a drying mechanism 1, a conveyor 2, a plurality of drying trays and a controller.

[0047] The drying mechanism 1 can be a hot air output mechanism composed of a hot air pump. The drying mechanism 1 is used for drying and heating air. The air outlet of the drying mechanism 1 externally conveys hot air for drying soil samples. The drying mechanism 1 has a resistance wire or a heating pipe type heating element inside. The resistance wire or the heating pipe type heating element converts electric energy into heat energy, so that air is heated to form hot air. The air outlet is arranged on a drying station, so that hot air uniformly and stably flows to the drying station, the drying trays on the drying station are uniformly heated, and efficient drying of soil samples is realized.

[0048] The conveyor 2 can be a chain type conveying belt. The width and length of the conveyor 2 can be configured according to the size of the drying tray. The conveyor 2 is driven to run by a motor. For example, the conveyor 2 is composed of multiple synchronous belts. The conveyor 2 can also be a conveyor composed of multiple plastic chains. The multiple synchronous belts are driven by one motor. The preset positions of the conveyor 2 in the horizontal direction are configured as drying stations. The drying stations are communicated with the air outlets. The preset positions can be set based on actual requirements. For example, the drying stations are arranged at the middle positions of the conveyor 2. The conveying forward side of the drying station is configured as a drying storage station, and the conveying reverse side of the drying station is configured as a drying waiting station. Figure 1As shown, a first drying tray 3, a second drying tray 4, and a third drying tray 5 are placed sequentially along the conveying direction of the conveyor 2. The first drying tray 3 is located at the drying waiting station, the second drying tray 4 is located at the drying station, and the third drying tray 5 is located at the drying storage station.

[0049] The drying trays can be designed with a grooved structure of a certain depth to prevent soil samples from spilling during transport and to facilitate the placement and removal of soil samples. The drying trays are made of high-temperature resistant materials, such as aluminum alloy or engineering plastics. Multiple drying trays are arranged at a preset interval along the conveying direction of conveyor 2, and each drying tray is used to hold a soil sample. The preset interval can be freely set, ensuring that adjacent drying trays do not interfere with each other. To improve drying efficiency, ventilation holes or breathable grilles can be provided on the bottom and / or sides of the drying trays to allow hot air to penetrate the soil sample from all directions and accelerate the drying process.

[0050] The controller can be configured as a programmable logic controller (PLC) or a control board with a microprocessor. The controller is connected to the conveyor 2. When the soil sample in the current drying tray of the drying station is dried, the controller controls the conveyor 2 to convey a preset interval so that the drying mechanism 1 can dry the soil sample in the next drying tray.

[0051] The drying process of the drying device will be described in detail below. The operator evenly spreads the soil samples to be dried in each drying tray and starts the drying device. The controller initializes, and the conveyor 2 precisely transports the first drying tray to the drying station. At this time, the drying mechanism 1 starts, and the generated hot air is continuously blown onto the drying trays at the drying station through the air outlet, heating and drying the soil samples. During the drying process, the controller can execute the drying task for the drying tray based on drying time or temperature and humidity data, and monitor the task execution progress at the drying station. When it is determined that the soil sample in the current drying tray has reached the preset dryness level, the conveyor 2 is controlled to move at preset intervals, removing the dried sample tray. A new tray containing soil samples enters the drying station, and hot air drying continues. This cycle continues until all soil samples are dried.

[0052] For example, please refer to Figure 2, the drying mechanism 1 comprises an air outlet pipe 6, an air control valve 7 and a hot air pump (not shown in the figure). The outlet of the air outlet pipe 6 is configured as an air outlet; the outlet of the air control valve 7 is communicated with the inlet of the air outlet pipe 6; the outlet of the hot air pump is communicated with the inlet of the air control valve 7. The air outlet pipe 6 can be vertically arranged, and the air outlet thereof is located at the bottom of the drying tray of the drying station; the air control valve 7 is used to perform on-off control of the hot air, and can be a manual valve or an automatic valve. When the air control valve 7 is configured as an automatic valve, the controlled end of the air control valve 7 is connected to the controller, and corresponding opening and closing actions are performed based on the control instructions of the controller. Of course, the air volume of the air outlet can also be adjusted based on the actual needs and progress of the drying task, so as to reduce the operating energy consumption of the drying device. The supply source of the hot air can also be configured as an air energy machine, which can output hot air to the air outlet pipe 6.

[0053] Further, please continue to refer to Figure 2 , the drying mechanism 1 further comprises an air inlet cover 8 and an air outlet cover 9 to form a drying box structure. The air inlet end of the air inlet cover 8 is mounted on the air outlet, and the air outlet end of the air inlet cover 8 is arranged close to the bottom of the drying tray of the drying station. The air outlet cover 9 is arranged on the top of the drying tray of the drying station to collect and discharge the drying steam of the soil sample in the drying station. The air inlet cover 8 and the air outlet cover 9 are both arranged in a conical structure, as shown in Figure 2 , the air outlet end of the air inlet cover 8 is covered on the bottom of the drying tray of the drying station, so that the hot air can flow uniformly into the inside of the drying tray. Based on the arrangement of the air inlet cover 8, the hot air can uniformly penetrate from the bottom of the drying tray upward, preventing the soil sample from being locally overheated or unevenly heated during the drying process. The evaporation rate of water in each part of the soil sample tends to be consistent, which can significantly improve the uniformity of drying and reduce the sample quality difference caused by uneven drying, providing more reliable samples for subsequent experiments. Similarly, the air outlet cover 9 can timely discharge the drying steam from the drying station, eliminating the negative effects of steam accumulation, avoiding the secondary moisture of the soil sample, shortening the drying period and improving the drying efficiency; at the same time, keeping the drying environment dry ensures that the soil sample is not contaminated and guarantees the accuracy of the subsequent experimental data.

[0054] In actual application, the execution progress of the drying task is determined based on the drying time, which may have the problem of insufficient accuracy. Based on this, in one specific embodiment, the device further comprises a humidity sensor 10.

[0055] The humidity sensor 10 is connected to the controller, and the humidity sensor 10 is installed on the steam discharge path of the drying station to detect the humidity of the soil sample in the drying station and output to the controller. Please refer to Figure 1 and Figure 2The humidity sensor 10 is installed at the outlet position of the exhaust cover 9, and the humidity sensor 10 can capture the humidity of the outlet of the exhaust cover 9 in real time, and accurately measure the humidity of the soil sample at the drying station. A capacitive humidity sensor can be used, and the sensing element of the capacitive humidity sensor can change the capacitance value with the change of the steam humidity, and then convert the humidity into an electrical signal, which is quickly and accurately output to the controller. The controller dynamically controls the drying process according to the received humidity data and the preset humidity threshold corresponding to different soil types. The humidity sensor 10 can also determine whether the drying degree of the soil sample meets the drying requirement, and when the drying requirement is met, the conveyor 2 is controlled to operate based on the instruction issued by the controller to dry the soil sample in the next drying tray.

[0056] For example, please refer to Figure 3 , Figure 3 is a structural schematic view of the drying tray. The drying tray includes a bottom plate 18, a plurality of positioning members 19, and a box 20. The middle part of the bottom plate 18 is in a hollow structure to facilitate the hot air to enter the box 20; the plurality of positioning members 19 are installed on the upper surface of the bottom plate 18 and can be installed around the periphery of the bottom plate 18, the top of each positioning member 19 is treated with an inverted bevel to facilitate the placement and removal of the box 20, and the plurality of positioning members 19 form a positioning space in the middle part of the bottom plate 18 after installation; the bottom of the box 20 is provided with a plurality of air permeable holes 21 arranged in an array, and the box 20 is placed in the positioning space. As shown in Figure 3 , when the bottom plate 18 is in a rectangular structure, the plurality of positioning members 19 are installed at the four corner positions of the bottom plate 18 to position the four right angles of the box 20.

[0057] It should be noted that the size of the box 20 is determined according to the amount of soil sample to be dried at one time. The soil sample is laid on the bottom of the box 20 by hand outside the equipment to make the soil sample evenly laid, and the thinner the soil sample is laid, the faster the drying time is, and the thicker the soil sample is laid, the longer the drying time is. The thickness of the soil sample to be laid can be 10-15 mm, and the corresponding drying time is set. When it is necessary to dry small soil samples, a layer of non-woven fabric is laid on the bottom of the box 20 to prevent the soil sample from falling out of the air permeable holes 21 in the bottom of the box 20.

[0058] For example, please continue to refer to Figure 1 , the conveyor 2 includes a first belt feeder 15, a second belt feeder 16, at least one transmission shaft, and a motor 17.

[0059] The first belt feeder 15 and the second belt feeder 16 are arranged in parallel, and are spaced apart by a preset distance to form a drying channel between the first belt feeder 15 and the second belt feeder 16, and the air outlet pipe 6 can be installed through the drying channel to facilitate the supply of hot air to the drying tray.

[0060] In actual application, the interval distance of each drying tray cannot be guaranteed to be the same based on manual operation to place the drying tray, so that the drying tray cannot be accurately moved to the drying station during subsequent movement.

[0061] The limiting mechanism is arranged along the conveying direction of the conveyor 2 to limit the plurality of drying trays so that the plurality of drying trays are at a preset interval distance. The limiting mechanism can be a long rod structure, and a plurality of limiting members perpendicular to the long rod are arranged on the long rod based on the placement distance of the drying tray.

[0062] For example, as shown in Figure 1 and Figure 4 , the limiting mechanism includes a plurality of limiting assemblies 11 arranged at a preset interval distance, each limiting assembly 11 including a gas cylinder 12, a limiting block 13, a position sensor 14, and a solenoid valve.

[0063] The gas cylinder 12 is arranged vertically, and the gas cylinder 12 can be a gas cylinder with a guide rod. The limiting block 13 is installed on the telescopic end of the gas cylinder 12. The position sensor 14 is installed on the side of the limiting block 13 away from the drying tray. The solenoid valve is connected to the gas cylinder 12 and the position sensor 14, and is used to control the gas cylinder 12 to perform an extension action when the position sensor 14 detects that the corresponding drying tray is close. As shown in Figure 4 , the limiting block 13 is arranged in an L-shaped structure, and the position sensor 14 is installed at the inner right angle position of the limiting block 13. The position sensor 14 is an optical sensor, and a through hole 22 is arranged on the limiting block 13 to facilitate the transmission and reception of signals by the position sensor 14. The position sensor 14 can detect whether the drying tray is close, and controls the gas cylinder 12 to extend when limiting is needed to limit the corresponding drying tray. It can be understood that the solenoid valve can be connected to a controller to realize automatic operation of the drying device based on the control timing sequence of the controller.

[0064] The technical scheme provided in the embodiments of the present application has at least the following technical effects or advantages:

[0065] The drying device comprises a drying mechanism, a conveyor, a plurality of drying trays and a controller, hot air of the drying mechanism is externally conveyed to dry soil samples, a preset position of the conveyor in a horizontal direction is configured as a drying station, the drying station is in communication with the air outlet; the plurality of drying trays are arranged at a preset interval along the conveying direction of the conveyor, and each drying tray is used for placing a soil sample; the controller is used for controlling the conveyor to convey the preset interval when the soil sample of the current drying tray in the drying station is completed drying, so that the drying mechanism dries the soil sample of the next drying tray. The soil samples of the plurality of drying trays can be automatically dried one by one through the drying device, the pipeline drying operation of the soil samples is realized, and cross contamination of the soil samples in the drying process can be effectively prevented.

[0066] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature, which can include direct contact between the first and second features, or indirect contact between the first and second features through another feature therebetween. Moreover, the first feature "above", "over" and "on" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "below", "under" and "under" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0067] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0068] In the present application, unless specifically defined and limited otherwise, the terms "connection", "fixing" and the like should be broadly understood, for example, "fixing" can be fixed connection, or detachable connection, or integral; "connection" can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0069] In addition, the terms "first", "second", and the like, as used in the description of the application, are used for descriptive purposes only and should not be construed as indicating or implying relative importance or an indicated number of features. Thus, a feature defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise expressly and specifically limited.

Claims

1. A soil sample drying device, characterized in that, The device includes: The drying mechanism has an air outlet that delivers hot air to dry the soil sample. A conveyor, wherein a preset horizontal position of the conveyor is configured as a drying station, and the drying station is connected to the air outlet; Multiple drying trays are arranged at a preset interval along the conveying direction of the conveyor, and each drying tray is used to place the soil sample; A controller is connected to the conveyor; the controller is used to control the conveyor to transport the soil sample of the next drying tray at the preset interval when the soil sample of the current drying tray at the drying station has been dried, so that the drying mechanism can dry the soil sample of the next drying tray.

2. The soil sample drying apparatus according to claim 1, characterized in that, The drying mechanism includes: An air outlet duct, wherein the outlet of the air outlet duct is configured as the air outlet; A pneumatic control valve, the outlet of which is connected to the inlet of the air outlet pipe; A hot air pump, the outlet of which is connected to the inlet of the pneumatic control valve.

3. The soil sample drying apparatus according to claim 2, characterized in that, The drying mechanism also includes: An air inlet cover is provided, with its air inlet end installed on the air outlet and its air outlet end located near the bottom of the drying tray at the drying station.

4. The soil sample drying apparatus according to claim 1, characterized in that, The drying mechanism also includes: An exhaust cover is installed on top of the drying tray at the drying station to collect and discharge the drying steam from the soil sample at the drying station.

5. The soil sample drying apparatus according to claim 1, characterized in that, The device further includes: A humidity sensor, connected to the controller, is installed on the steam exhaust path of the drying station to detect the humidity of the soil sample in the drying station and output it to the controller.

6. The soil sample drying apparatus according to claim 1, characterized in that, The device further includes: A limiting mechanism is arranged along the conveying direction of the conveyor to limit the plurality of drying trays so that the plurality of drying trays are at the preset spacing.

7. The soil sample drying apparatus according to claim 6, characterized in that, The limiting mechanism includes multiple sets of limiting components arranged at the preset intervals, each set of limiting components including: The cylinder is arranged vertically. A limiting block is installed on the telescopic end of the cylinder; A position sensor is installed on the side of the limiting block away from the drying tray; A solenoid valve is connected to both the cylinder and the position sensor. The solenoid valve is used to control the cylinder to extend when the position sensor detects that the corresponding drying tray is approaching.

8. The soil sample drying apparatus according to claim 1, characterized in that, The conveyor includes: First belt feeder; The second belt feeder is arranged parallel to the first belt feeder so that a drying channel is formed between the first belt feeder and the second belt feeder; At least one drive shaft is connected to both the first belt feeder and the second belt feeder; The motor is connected to the drive shaft.

9. The soil sample drying apparatus according to claim 1, characterized in that, The drying tray includes: The base plate has a hollow structure in the middle. Multiple positioning components are installed on the upper surface of the base plate; The material box has a dot-matrix pattern of ventilation holes at its bottom and is placed within the positioning space formed by the plurality of positioning elements.

10. The soil sample drying apparatus according to claim 1, characterized in that, The drying station is located in the middle of the conveyor, such that the forward conveying side of the drying station is configured as a drying and storage station, and the reverse conveying side of the drying station is configured as a drying waiting station.

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