A self-sieving self-cleaning soil sample continuous sample preparation system

Abstract

This utility model discloses a continuous soil sample preparation system with self-sieving and self-cleaning capabilities, comprising a feeding device, a soil grinding device, an automatic sieving device, and a pneumatic cleaning device. The soil grinding device includes a pair of extrusion rollers and a drive motor, with its inlet connected to the feeding device and its outlet connected to the automatic sieving device via a sealing valve. The automatic sieving device includes a multi-layer screen and a vibrating motor, with multiple dispensing outlets on its side. The pneumatic cleaning device includes an air compressor, a main air path, and branch nozzles, with the branch nozzles extending into the interior of the soil grinding device and onto the surface of the screens in the automatic sieving device. The sealing valve is linked to the pneumatic cleaning device for control, enabling switching between sample delivery and cleaning modes. This utility model integrates the soil grinding device, the automatic sieving device, and the pneumatic cleaning device, achieving continuous automated operation of the entire process of soil crushing, sieving, and cleaning, thereby improving the efficiency of soil sample preparation.

Description

Technical Field

[0001] This utility model belongs to the field of soil sample testing technology, and in particular relates to a continuous soil sample preparation system with self-sieving and self-cleaning properties. Background Technology

[0002] Existing roller crushers mainly achieve the purpose of crushing samples by squeezing the rollers against each other: the sample is added through the feed port, the motor drives the rollers to squeeze and crush the sample, and then the crushed sample is taken out from the discharge port and passed through sample sieves of different apertures. The sample cannot be automatically sieved, the crushing and sieving processes are disconnected, automation is lacking, the sample preparation efficiency is low, and the equipment needs to be manually cleaned after the sample crushing and sieving is completed, which is difficult, time-consuming and labor-intensive. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, this utility model provides a continuous soil sample preparation system with self-sieving and self-cleaning. By integrating the soil grinding device, automatic sieving device and pneumatic cleaning device, the entire process of soil crushing, sieving and cleaning is continuously automated, thereby improving the efficiency of soil sample preparation.

[0004] Technical solution: To achieve the above objectives, this utility model provides a continuous soil sample preparation system with self-sieving and self-cleaning capabilities, comprising a feeding device, a soil grinding device, an automatic sieving device, and a pneumatic cleaning device.

[0005] The grinding device includes a pair of extrusion rollers and a drive motor. Its inlet is connected to the feeding device, and its outlet is connected to the automatic screening device through a sealing valve.

[0006] The automatic screening device includes a multi-layer screen and a vibrating motor, and has multiple material dispensing outlets on its side.

[0007] The pneumatic cleaning device includes an air compressor, a main air passage, and branch nozzles, with the branch nozzles extending into the interior of the grinding device and the screen surface of the automatic screening device.

[0008] The sealing valve is linked to the pneumatic cleaning device for control, enabling the switching between sample delivery and cleaning modes.

[0009] Furthermore, the surface of the extrusion roller shaft of the soil grinding device is provided with multiple sets of independent convex rib units. Each set of convex rib units consists of multiple protrusions distributed at intervals along the circumference of the extrusion roller shaft, and adjacent convex rib units are arranged in an alternating spiral pattern. When the extrusion roller shafts rotate in opposite directions, the convex rib units apply shear force to the soil through alternating meshing action, and the axial gap between the convex rib units forms a soil conveying channel.

[0010] Furthermore, the protrusions of the convex ridge unit are in the shape of a frustum of a square pyramid.

[0011] Furthermore, the main air path of the pneumatic cleaning device is divided into two paths: the first branch is connected to the discharge port of the grinding device, which is used to blow the crushed sample into the automatic screening device; the second branch is connected to the branch nozzle, which is used to clean the inner wall and screen of the grinding device by reverse air blowing.

[0012] Furthermore, the multi-layer screens of the automatic screening device are arranged in a stepped inclined manner, and each layer of screens has a temperature-controlled collection bin at the lower end of the material discharge. The bottom of each temperature-controlled collection bin is connected to a discharge pipe with a solenoid valve, and the discharge pipe is connected to the material distribution outlet in a one-to-one correspondence.

[0013] Furthermore, it also includes a central controller that is electrically connected to the drive motor, vibration motor, air compressor, and sealing valve.

[0014] Furthermore, the feeding device is a feeding hopper, and its top is provided with a sealable cover.

[0015] Furthermore, the inner surfaces of the feed hopper and the sealable cover are coated with a layer of nano-hydrophobic material.

[0016] Beneficial effects: This utility model achieves the switching of crushing, screening, and cleaning modes through the linkage of a pneumatic cleaning device and a sealing valve. The process is executed automatically without manual intervention, thus solving the main problems of low sample preparation efficiency and difficult equipment cleaning caused by the disconnect between soil crushing and screening and the need for manual cleaning in the prior art. Furthermore, the feeding, grinding, and screening adopt a closed pipeline connection mode to eliminate the risk of cross-contamination of samples. The pneumatic cleaning device has dual functions of pneumatic soil conveying and pneumatic cleaning, and the two functions do not interfere with each other. Pneumatic conveying replaces mechanical conveying to avoid sample residue, while pneumatic cleaning allows for manual cleaning, improving the convenience and efficiency of cleaning. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the extrusion roller shaft and the convex rib unit of the grinding device. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] like Figure 1As shown, a self-screening and self-cleaning continuous soil sample preparation system includes a feeding device 1, a soil grinding device 2, an automatic screening device 3, and a pneumatic cleaning device 4. The soil grinding device 2 includes a pair of extrusion rollers 21 and a drive motor 22. Its inlet is connected to the feeding device 1, and its outlet is connected to the automatic screening device 3 through a sealing valve 5. The automatic screening device 3 includes a multi-layer screen 31 and a vibration motor 32, and multiple dispensing outlets 33 are provided on its side. The pneumatic cleaning device 4 includes an air compressor 41, a main air passage 42, and branch nozzles 43. The branch nozzles 43 extend into the interior of the soil grinding device 2 and onto the surface of the screen 31 of the automatic screening device 3. The sealing valve 5 is linked with the pneumatic cleaning device 4 for control, realizing the switching between sample delivery and cleaning modes. This invention achieves automatic switching between crushing, screening, and cleaning modes through the linkage of the pneumatic cleaning device 4 and the sealing valve 5. The process is executed automatically without manual intervention, thus solving the main problems of low sample preparation efficiency and difficult equipment cleaning caused by the disconnect between soil crushing and screening and the need for manual cleaning in the prior art. Furthermore, the feeding, grinding, and screening adopt a closed pipeline connection mode to eliminate the risk of cross-contamination of samples. The pneumatic cleaning device 4 has dual functions of pneumatic soil conveying and pneumatic cleaning, and the two functions do not interfere with each other. Pneumatic conveying replaces mechanical conveying to avoid sample residue, while pneumatic cleaning allows for manual cleaning of the sample, improving the convenience and efficiency of cleaning.

[0021] like Figure 2 As shown, the surface of the extrusion roller shaft 21 of the soil grinding device 2 is provided with multiple sets of independent convex rib units 21a. Each set of convex rib units 21a is composed of multiple protrusions distributed at intervals along the circumference of the extrusion roller shaft 2, and adjacent convex rib units 21a are arranged in an alternating spiral pattern. When the extrusion roller shaft 21 rotates in opposite directions, the convex rib units 21a apply shearing force to the soil through alternating meshing. The alternating arrangement of the convex rib units 21a forms a high-frequency shearing, which greatly improves the soil crushing efficiency compared with the traditional smooth roller extrusion method. In addition, the axial gap between the convex rib units 21a forms a soil conveying channel, which avoids material clogging the roller gap and prevents highly viscous soil from sticking together.

[0022] Preferably, in this invention, the protrusion of the convex rib unit 21a is in the shape of a truncated quadrangular pyramid. Based on the stress concentration effect, the edge can enhance the soil tearing effect, and the inclined surface guides the axial movement of the soil and prevents adhesion.

[0023] like Figure 1As shown, the main air path 42 of the pneumatic cleaning device 4 is divided into two paths: the first branch 42a is connected to the discharge port of the soil grinding device 2, which is used to blow the crushed sample into the automatic screening device 3 to realize soil transportation. The crushed sample is blown into the automatic screening device 3 in a timely and accurate manner, ensuring continuous sample transportation and screening efficiency. The high-pressure airflow also realizes the transfer of sample without residue. The second branch 42b is connected to the branch nozzle 43, which is used to clean the inner wall and screen 31 of the soil grinding device 2 by reverse air blowing. This cleaning can more comprehensively and effectively remove soil residue inside the equipment, improve the cleaning effect, reduce cleaning dead corners, and ensure the cleanliness of the equipment and the accuracy of the next sample preparation.

[0024] This utility model also includes a central controller, which is electrically connected to the drive motor 22, the vibration motor 32, the air compressor 41, and the sealing valve 5. The central controller is preset with the following parameters:

[0025] 1) Crushing time T1, screening time T2, and cleaning time T3;

[0026] 2) Valve opening and closing sequence: When feeding, close sealing valve 5 → when grinding ends, open sealing valve 5 → when screening ends, close valve 5 → when cleaning mode is activated.

[0027] By integrating the soil grinding device 2, the automatic screening device 3, and the pneumatic cleaning device 4, corresponding to the crushing T1→screening T2→cleaning T3 process, the entire process of soil crushing, screening, and cleaning is continuously automated, improving the efficiency of soil sample preparation.

[0028] The automatic screening device 3 features a multi-layered, inclined screen 31 arranged in a stepped manner, achieving dual-action screening through gravity and vibration to improve screening efficiency. Each screen 31 has a temperature-controlled collection bin 34 at its lower end, with each bin connected to a discharge pipe 36 equipped with a solenoid valve 35. The discharge pipe 36 is connected to a corresponding material outlet 33. The temperature-controlled collection bin 34 addresses the problem of soil clumping in high-humidity conditions. The bin integrates a humidity sensor and a heating module, which can be a heating rod, heating resistance wire, etc. For example, when the humidity is detected to be greater than 15%, the central controller activates the heating module for drying.

[0029] The feeding device 1 is a feeding hopper, and its top is provided with a sealable cover plate 11 to prevent internal dust from escaping and to prevent particles in the outside air from entering and causing pollution.

[0030] The inner surfaces of the feed hopper and the sealable cover plate 11 are coated with a layer of nano-hydrophobic material. The nano-hydrophobic material has good waterproof, dustproof and easy-to-clean properties, which can prevent soil samples from adhering to and remaining on the inner surfaces of the feed hopper and the cover plate 11, reducing the difficulty and workload of cleaning, and also helping to ensure the purity and sample preparation quality of the soil samples.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A continuous soil sample preparation system with self-sieving and self-cleaning properties, characterized in that: It includes a feeding device (1), a grinding device (2), an automatic screening device (3), and a pneumatic cleaning device (4); The grinding device (2) includes a pair of extrusion rollers (21) and a drive motor (22). Its inlet is connected to the feeding device (1), and its outlet is connected to the automatic screening device (3) through a sealing valve (5). The automatic screening device (3) includes a multi-layer screen (31) and a vibrating motor (32), and multiple material outlets (33) are provided on its side; The pneumatic cleaning device (4) includes an air compressor (41), a main air passage (42) and a branch nozzle (43), the branch nozzle (43) extending into the interior of the grinding device (2) and onto the surface of the screen (31) of the automatic screening device (3); The sealing valve (5) is linked with the pneumatic cleaning device (4) to achieve the switching between sample delivery and cleaning modes.

2. The continuous soil sample preparation system with self-sieving and self-cleaning properties according to claim 1, characterized in that: The surface of the extrusion roller shaft (21) of the soil grinding device (2) is provided with multiple sets of independent convex rib units (21a). Each set of convex rib units (21a) consists of multiple protrusions distributed circumferentially along the extrusion roller shaft (21), and adjacent convex rib units (21a) are arranged in an alternating spiral pattern. When the extrusion roller shaft (21) rotates in opposite directions, the convex rib units (21a) apply shear force to the soil through alternating meshing action, and the axial gap between the convex rib units (21a) forms a soil conveying channel.

3. The continuous soil sample preparation system with self-sieving and self-cleaning properties according to claim 2, characterized in that: The protrusions of the convex rib unit (21a) are in the shape of a frustum of a square pyramid.

4. The continuous soil sample preparation system with self-sieving and self-cleaning properties according to claim 1, characterized in that: The main air path (42) of the pneumatic cleaning device (4) is divided into two paths: the first branch (42a) is connected to the discharge port of the grinding device (2) and is used to blow the crushed sample into the automatic screening device (3); the second branch (42b) is connected to the branch nozzle (43) and is used to clean the inner wall and screen (31) of the grinding device (2) by reverse air blowing.

5. The continuous soil sample preparation system with self-sieving and self-cleaning properties according to claim 4, characterized in that: The automatic screening device (3) has a multi-layer screen (31) arranged in a stepped inclined manner. Each screen (31) has a temperature-controlled collection bin (34) at the bottom of the material drop end. The bottom of each temperature-controlled collection bin (34) is connected to a discharge pipe (36) with a solenoid valve (35). The discharge pipe (36) is connected to the material distribution outlet (33) in a one-to-one correspondence.

6. The continuous soil sample preparation system with self-sieving and self-cleaning as described in claim 5, characterized in that: It also includes a central controller, which is electrically connected to the drive motor (22), the vibration motor (32), the air compressor (41), and the sealing valve (5).

7. The continuous soil sample preparation system with self-sieving and self-cleaning properties according to claim 1, characterized in that: The feeding device (1) is a feeding hopper, and a sealable cover plate (11) is provided on its top.

8. The continuous soil sample preparation system with self-sieving and self-cleaning as described in claim 7, characterized in that: The inner surfaces of the feed hopper and the sealable cover plate (11) are coated with a layer of nano-hydrophobic material.

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