Silkworm excrement treatment device with negative pressure collection function

Abstract

The invention provides a silkworm excrement treatment device with negative pressure collection, which solves the pathogen diffusion and pollution problems of silkworm excrement stack retting through collaborative structural innovation: a stainless steel exhaust pipe vertically penetrates through the center of the top surface of a storage chamber and is connected with a gas treatment unit, namely an activated carbon canister for physically adsorbing pollutants, two 185nm ultraviolet lamp tubes are arranged in a UV disinfection cabin in parallel, and the ultraviolet lamp tubes are connected with the stainless steel exhaust pipe. A titanium dioxide catalysis net is filled in a gap of the lamp tube, a vacuum pump maintains negative pressure of-0.08 MPa to drive airflow to pass through directionally, and 99.97% inactivation rate of pathogens and removal rate of HS larger than 95% are achieved. The feeding hole rotary airtight valve is dynamically sealed through a silica gel sealing ring at the edge of a valve plate; and a trapezoidal silica gel gasket of the hydraulic sealing door of the discharge hole is precisely matched with a 15-degree conical flange surface after being pressed and expanded, so that a mechanical self-tightening zero-leakage barrier is formed. A temperature probe is pre-embedded in the 1 / 2 height of the side wall to monitor the core temperature of the pile body, a gas pressure sensor 10 cm below the top surface feeds back the gas state in real time, and the system is automatically adjusted to run in an over-limit mode.

Description

Technical Field

[0001] The present invention relates to the field of silkworm excrement processing, and more particularly to a silkworm excrement processing device with negative pressure collection. Background Art

[0002] Silkworm excrement, an inevitable byproduct of the sericulture industry, is rich in organic matter such as nitrogen and phosphorus, but it can also be a carrier of pathogens (such as nuclear polyhedrosis virus and microsporidia). Traditional open-air composting methods have serious drawbacks: significant risk of pathogen spread; low fermentation efficiency, requiring 6-8 months for natural composting; and uneven temperature distribution, resulting in incomplete sterilization. Furthermore, this method causes secondary pollution, with rainwater leachate contaminating the soil and groundwater and direct release of harmful gases such as ammonia and hydrogen sulfide. To address these issues, existing technologies, such as patent CN106146052A, propose a sealed storage chamber structure, achieving physical isolation through cement walls and a reinforced concrete roof. This utilizes the high temperatures of composting (above 50°C) to achieve a basic sterilization effect. However, this technology still has significant limitations: static sealing is passive, relying solely on soil covering the cover and foam sealing strips. After long-term use, the materials age and the airtightness decreases. The accumulation of harmful gases is a prominent problem. Methane and hydrogen sulfide produced during the fermentation process accumulate indoors, posing a risk of explosion and poisoning when the warehouse is opened. Furthermore, the technology lacks active processing capabilities, making it impossible to filter or disinfect exhaust gases, and ultimately, emissions still pollute the environment. The industry urgently needs a breakthrough solution that meets three requirements: an integrated negative pressure system for active airflow control, an embedded gas treatment unit for harmless emissions, and a real-time monitoring mechanism to provide feedback on temperature, pressure, and harmful gas concentrations, thereby completely addressing pathogen spread, operational safety, and environmental compliance. Summary of the Invention

[0003] The present invention provides a silkworm excrement processing device with negative pressure collection, which solves the problems of pathogen spread and environmental pollution in traditional silkworm excrement composting through a triple coordinated structure.

[0004] In order to overcome the defects in the prior art, the present invention proposes a silkworm excrement processing device with negative pressure collection, comprising a storage chamber, a feed port arranged at the top of the storage chamber, and a discharge port arranged at the side of the storage chamber. A stainless steel negative pressure exhaust pipe is vertically penetrated through the center of the top surface of the storage chamber, and the diameter of the pipe is 20 cm; The upper end of the negative pressure exhaust pipe is connected to a gas processing unit through a flange, and the gas processing unit includes an activated carbon tank and a UV disinfection cabin connected in series; The exhaust port of the gas processing unit is connected to the air inlet of the vacuum pump.

[0005] Preferably, two 185nm ultraviolet lamps are fixed in parallel inside the UV disinfection chamber, and a titanium dioxide catalytic mesh is filled between the two lamps.

[0006] Preferably, a rotary airtight valve is installed inside the feed inlet channel; The airtight valve comprises a circular valve plate, the diameter of which is equal to the inner diameter of the feed inlet channel; The valve plate is rotated by a rotating shaft that transversely passes through the side wall of the feed channel; An annular groove is provided on the edge of the valve plate, and a silicone sealing ring is embedded in the groove.

[0007] Preferably, the discharge port is equipped with a hydraulic sealing door structure; The hydraulic sealing door structure includes a steel door panel, which is connected to the embedded parts of the outer wall of the discharge port through a hinge; An annular groove is processed on the inner surface of the door panel, and an annular hollow silicone gasket with a trapezoidal cross section is embedded in the groove.

[0008] Preferably, the hydraulic sealing door structure further comprises a hydraulic cylinder; The piston rod end of the hydraulic cylinder is hinged to the bracket on the back side of the door panel; The cylinder end of the hydraulic cylinder is hinged to the pre-embedded base of the wall.

[0009] Preferably, a slide rail is fixedly installed on the bottom of the activated carbon tank; A slot matching the slide rail is provided on the top of the UV disinfection chamber; The slide rail and the slot form a separable plug-in connection structure.

[0010] Preferably, the extended length of the slide rail is greater than 1.5 times the diameter of the activated carbon canister; A handle is welded on the top of the activated carbon tank.

[0011] Preferably, a temperature sensor probe is embedded at 1 / 2 of the height of the storage chamber side wall; An air pressure sensor is embedded 10 cm below the top surface of the storage chamber; The probe wire is led out to the outside through a pre-buried wire tube.

[0012] Preferably, the depth of the annular groove is 80% of the uncompressed height of the silicone gasket; The assembly gap between the inner wall of the groove and the gasket is 0.5 mm.

[0013] Preferably, the sealing surface of the discharge port flange is processed into a conical slope of 15°±1°; The conical inclined surface matches the trapezoidal inclined surface of the silicone gasket.

[0014] Compared with the prior art, the present invention has the following beneficial effects: A negative pressure exhaust pipe runs vertically through the center of the storage chamber's ceiling, forcibly directing pathogen-laden airflow into the gas treatment unit. Within this unit, parallel UV lamps and catalytic screens are arranged. Through the synergistic effect of UV radiation (185nm) and titanium dioxide photocatalytic reactions, they disrupt microbial DNA and decompose organic toxins.

[0015] The hydraulic sealing door at the discharge port features a trapezoidal cross-section silicone gasket that expands radially under pressure to fill the flange gap. Combined with a 15° tapered sealing surface, this creates a geometric self-locking effect, eliminating gap penetration caused by aging of traditional foam seals. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present disclosure includes accompanying drawings, which should be considered as included in and constitute a part of the specification, and together with the specification, illustrate various exemplary embodiments, features, and aspects of the present disclosure and are used to explain the principles of the present disclosure. The present disclosure will be more fully understood through the following detailed description in conjunction with the accompanying drawings, in which similar elements are numbered in a similar manner. Among them: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a flow chart of the dynamic seal test of the present invention; Figure 3 This is a flow chart of the base pre-embedding of the present invention; Figure 4 It is a flow chart of the on-site installation operation process of the activated carbon canister of the present invention; Figure 5 is a flow chart of sensor fixing and sealing of the present invention; Figure 6 It is a fault emergency processing flow chart of the present invention; Figure 7 This is a low-temperature assembly flow chart of the gasket of the present invention; Figure 8 It is a flow chart of the dynamic sealing test of the present invention. DETAILED DESCRIPTION

[0017] Below by embodiment, and in conjunction with the accompanying Figure 1-8 , the technical solution of the present invention is further described in detail, but the present invention is not limited to the following embodiments.

[0018] A silkworm excrement processing device with negative pressure collection includes a storage chamber 1, a feed port 2 arranged at the top of the storage chamber, and a discharge port 3 arranged on the side of the storage chamber. A stainless steel negative pressure exhaust pipe 201 is vertically penetrated through the center of the top surface of the storage chamber 1, and the diameter of the pipe is 20 cm; the upper end of the negative pressure exhaust pipe 201 is connected to a gas processing unit 6 through a flange, and the gas processing unit includes an activated carbon canister 601 and a UV disinfection cabin 602 connected in series; the exhaust port of the gas processing unit 6 is connected to the air inlet of a vacuum pump 8.

[0019] Construction of main structure and core components During the construction of the storage chamber, the foundation was first precisely leveled, using a total station to ensure a deviation of ≤2mm along the foundation axis. The concrete foundation was constructed with a C30 impermeability grade (P8 grade) and internally reinforced with a double-layer, bidirectional Φ12@200mm steel mesh. Insert vibrators were used during pouring to compact the concrete in layers. After final set, the concrete was covered with a geotextile and cured for 28 days to maintain moisture retention. During wall construction, the above-ground structure was constructed with MU15 fired bricks (240mm thick), with horizontal mortar joints strictly controlled to within 8-10mm. Reinforced concrete columns were installed every 1.2m to enhance structural integrity. The underground structure employed M10 cement mortar for 300mm-thick stone walls. The exterior walls were waterproofed with a "three-felt, four-oil" coating, and 500mm-wide reinforced waterproofing membrane was added at the corners. The ceiling construction is a key node: During rebar binding, an S30408 ​​stainless steel sleeve (DN200 x 4mm) was embedded in the center of the ceiling. The verticality was calibrated using a laser line projector to a deviation of ≤0.5°. The lower end of the sleeve was flush with the interior ceiling, with the upper end extending 200mm. After concrete pouring, the sleeve gap was sealed with non-shrinkage grouting and continuously watered for 7 days to prevent cracking.

[0020] The gas treatment unit is assembled in a cleanroom. Two mirror-polished stainless steel rails (60×40×5mm, surface roughness Ra ≤ 0.8μm) are welded to the bottom of the activated carbon canister. A 52±0.1mm-deep T-shaped slot is machined into the top of the UV disinfection chamber and inlaid with ultra-high molecular weight polyethylene wear strips. During assembly, the disinfection chamber is secured to a dedicated bracket, and the activated carbon canister is pushed along the rails into the slot at a 30° angle until a mechanical lock snaps into place. The photocatalytic system is integrated in a darkroom environment. Two 185nm wavelength low-pressure mercury lamps (30W) are mounted parallel to each other and calibrated to a spacing of 80±0.5mm using a laser rangefinder. A 100-mesh titanium dioxide catalytic mesh (heat-treated at 450°C to produce an anatase crystal form) is placed between the two lamps. The mesh maintains a precise spacing of 5±0.2mm from the lamp. The pipeline connection adopts a flange structure with PTFE sealing gasket, and the corrugated hose uses a double-layer 316L stainless steel braided layer (negative pressure resistance -0.1MPa). All interfaces have completed helium mass spectrometry leak testing (leakage rate ≤1×10⁻ 6 Pa·m³ / s) before it can be put into use.

[0021] Dynamic sealing system and operation verification The feed inlet sealing system undergoes three stages of precision manufacturing: the valve plate is machined from 316L stainless steel using a five-axis CNC machine tool to a surface roughness of Ra0.4, and a 10×8mm annular sealing groove is machined around the edge. A silicone sealing ring with a Shore hardness of 65±3° is molded and vulcanized and then pressed into the groove using a special tool (interference allowance of 0.5mm). The shaft assembly is assembled with a zirconia ceramic rolling bearing (ABEC-7 accuracy grade) and has undergone 2,000 opening and closing tests to ensure no sticking. The hydraulic sealing door at the discharge port is manufactured to even stricter standards. The door panel is laser-cut from 10mm-thick Q345D steel and tempered to a hardness of HRC 28-32. A 12±0.05mm deep annular groove (15±0.1mm wide) is CNC-milled on the inside of the door panel. A trapezoidal silicone gasket (70±5° Shore hardness) is inserted into the groove after aging for 72 hours in a constant temperature and humidity environment. The hydraulic cylinder is equipped with a magnetostrictive displacement sensor (0.01mm resolution) and has passed 500,000 cycles of fatigue testing before shipment. The sealing surface is CNC-machined with a 15°±0.05° tapered flange. After CNC-testing the profile to ≤0.02mm, the surface is plated with a 30μm hard chrome layer (HV900 hardness).

[0022] The equipment operates according to standardized procedures: Before startup, the sealing door pressure sensor reading is confirmed to be >0.5 MPa. The vacuum pump is soft-started via a frequency converter (0-50 Hz / 30 seconds), maintaining a negative pressure of -0.08±0.005 MPa. During operation, the core temperature is controlled within the range of 55-70°C, and the UV lamp current is stabilized at 0.6±0.05A. Maintenance regulations stipulate that the activated carbon canister is tested for carbon tetrachloride adsorption every three months (if < 60%, replace), the UV lamp is tested for 253.7 nm irradiance after 8000 hours of operation (if < 800 μW / cm², replace), and the silicone seal is tested for compression set every six months (if > 20%, replace). Acceptance test data validates performance: a 24-hour negative pressure test with a pressure drop of ≤2.3%, a Bacillus subtilis var. niger spore challenge test with an inactivation rate of 99.998%, and an H2S removal rate of 96.7% (in compliance with GB / T 16157). This demonstrates that the device achieves efficient sterilization and zero-leakage operation through structural innovation.

[0023] In the UV disinfection chamber 602 of this embodiment, two 185nm ultraviolet lamps are fixed in parallel inside, and a titanium dioxide catalytic mesh is filled between the two lamps.

[0024] UV disinfection cabin core structure manufacturing and integration Inside the disinfection chamber 602 of the gas processing unit 6, two 185nm low-pressure mercury UV lamps are fixed parallel to the chamber's side walls via precision ceramic holders. The axial spacing between the lamps is strictly controlled within a range of 80 ± 0.1mm. A spring-loaded mechanism on the back of the holder compensates for thermal expansion, ensuring the lamps maintain a constant position throughout their lifecycle. The gap between the two lamps is filled with a 100-mesh titanium dioxide catalytic mesh woven with titanium wire. This mesh undergoes a 450°C heat treatment to form an anatase-type active structure. The four edges are reinforced with stainless steel edging, and spring tensioning mechanisms at the four corners maintain mesh flatness. The catalytic mesh maintains an optimal irradiation distance of 5 ± 0.1mm from the lamp surface, calibrated using a laser rangefinder to maximize UV ​​photocatalytic reaction efficiency. The chamber's end caps utilize fluororubber O-rings for an airtight seal (temperature-resistant to 250°C). The quartz observation window is coated with a special UV-blocking coating, ensuring a transmittance of >90% in the 185nm band.

[0025] When the disinfection chamber is integrated, it forms a quick-release structure with the activated carbon canister 601: a mirror-polished stainless steel slide rail (surface roughness Ra ≤ 0.8μm) is welded to the bottom of the activated carbon canister, and a T-shaped slot with a depth of 52±0.1mm is opened on the top of the disinfection chamber and inlaid with ultra-high molecular weight polyethylene wear-resistant strips. During assembly, the activated carbon canister is accurately pushed into the slot along the slide rail at a 30° angle. When the mechanical lock is closed, a crisp "click" sound is emitted to confirm that it is in place. The entire gas processing unit is connected to the negative pressure exhaust pipe 201 through a flange. PTFE sealing gaskets are used at the interface. The leak test of helium mass spectrometry has reached ≤1×10⁻ 6 Military-grade sealing standard of Pa·m³ / s.

[0026] A rotary airtight valve 301 is installed inside the feed port 2 channel of this embodiment; the airtight valve 301 includes a circular valve plate, the diameter of which is equal to the inner diameter of the feed port channel; the valve plate rotates through a rotating shaft that transversely passes through the side wall of the feed channel; an annular groove is provided on the edge of the valve plate, and a silicone sealing ring is embedded in the groove.

[0027] Valve manufacturing process Valve plate precision machining The circular valve disc is machined from 316L stainless steel bar stock on a five-axis CNC lathe, its diameter precisely matching the inner diameter of the feed channel (tolerance ±0.05mm). An 8mm deep, 10mm wide annular sealing groove is machined into the disc's edge, with a bottom radius of R = 1mm to minimize stress concentration. The surface is mirror-polished (Ra ≤ 0.4μm) to reduce friction during opening and closing.

[0028] Vulcanization molding of sealing ring The silicone seal is made of food-grade liquid silicone (Shore hardness 65±3°) and is compression-cured in a mold at 160°C. A secondary vulcanization treatment (200°C / 4h) eliminates volatile substances, resulting in a compression set of ≤10% for the finished product.

[0029] Shaft system assembly The shaft is made of GCr15 bearing steel and nitrided (hardness HV850). Zirconia ceramic rolling bearings (ABEC-7 precision grade) are installed at both ends. The bearing seats are laser welded to the side walls of the feed channel, with a coaxiality error of ≤0.02mm.

[0030] On-site installation implementation steps Channel preprocessing A Φ30H7 precision-machined hole is drilled on both sides of the feed inlet 2 channel, with the hole center 150mm from the channel top. The hole wall is hard chrome plated (20μm thick) to enhance wear resistance.

[0031] Valve assembly process Press the silicone sealing ring into the annular groove of the valve plate (interference amount 0.8%); The rotating shaft passes through the center hole of the valve plate, and ceramic bearings are inserted into both ends; The whole is hoisted and inserted into the bearing seat on the side wall of the channel, with the bolt pre-tightening force of 120N·m; A dustproof end cover (IP65 protection grade) is installed on the outside of the valve body.

[0032] Dynamic seal test Test standard: Bubble method detection leakage ≤ 0.5mL / min.

[0033] The discharge port 3 of this embodiment is equipped with a hydraulic sealing door structure; the hydraulic sealing door structure includes a steel door panel, which is connected to the embedded parts of the outer wall of the discharge port through a hinge; an annular groove is processed on the inner surface of the door panel, and an annular hollow silicone gasket with a trapezoidal cross-section is embedded in the groove.

[0034] Door manufacturing process Door panel precision machining 10mm thick Q235B steel plates are laser cut and edge-machined with a 30° weld groove. A vertical machining center mills an annular groove on the inner surface of the door panel. The groove depth is 12±0.05mm (corresponding to 80% of the uncompressed height of the silicone gasket, 15mm) and the width is 15±0.1mm. The bottom of the groove is shot-peened (Sa2.5 grade) to enhance bonding strength, and the verticality of the groove wall is ≤0.02mm.

[0035] Silicone gasket molding The trapezoidal-section annular gasket is made of fluorosilicone rubber with a Shore hardness of 70±5° and is compression-vulcanized in a mold at 160°C. The hollow cavity is designed to have a wall thickness of 2mm. After vulcanization, it undergoes a secondary vulcanization (200°C / 4h) to eliminate internal stresses. The dimensional tolerance is controlled to ±0.1mm.

[0036] Hinge system assembly The hinge features a heavy-duty stainless steel four-bearing structure (load capacity ≥ 2 tons). The hinge base is fully welded to the embedded wall component (8mm thick steel plate), and the welds are 100% magnetic particle inspected. The hinge shaft is hard chrome plated (30μm thick) with a clearance of 0.05-0.08mm.

[0037] On-site installation process Embedded parts positioning During the reinforcement binding phase on both sides of outlet 3, 200×200×8mm steel plates (Q345D) were embedded, with the embedded surface flush with the exterior wall. A total station was used for calibration and positioning, with a horizontal error of ≤1mm / m. Embedded bolts were secured using M20×300 chemical anchors.

[0038] Door assembly The gasket is pressed into the groove after shrinking at low temperature (interference amount 0.8%) The door panel is hoisted by crane, and the deviation between the hinge hole and the embedded part hole is ≤0.5mm Apply food grade grease (NLGI 2#) after the pin is installed. Sealing surface fit adjustment The discharge flange sealing surface is CNC-machined to a 15° taper angle (tolerance ±0.05°). The clearance between the flange and the bevel of the gasket is controlled to 0.05-0.1mm using a feeler gauge. A pressure-sensitive test strip is evenly applied to the contact surface to verify a contact ratio of at least 80%.

[0039] Sealing performance verification Static testing After the door panel is closed, the hydraulic system is pressurized to 0.6MPa Apply soap solution on the outside of the sealing surface and maintain pressure for 5 minutes without generating bubbles. Helium mass spectrometer leak detection rate ≤1×10⁻ 5 Pa·m³ / s Test loop pressure fluctuations Leakage First opening and closing ±0.01MPa 0.8mL / min After 1000 times ±0.008MPa 0.5mL / min After 5000 times ±0.012MPa 1.2mL / min The hydraulic sealing door structure of this embodiment also includes a hydraulic cylinder; the end of the piston rod of the hydraulic cylinder is hinged to the bracket on the back side of the door panel; the end of the cylinder body of the hydraulic cylinder is hinged to the pre-embedded base in the wall.

[0040] Hydraulic system design and manufacturing The HSG-63 / 35 engineering hydraulic cylinder features a 63mm bore and a 35mm rod diameter, allowing for a precisely controlled stroke of 300mm (±0.1mm repeatability) and a rated operating pressure of 16MPa. A built-in magnetostrictive displacement sensor with a resolution of 0.01mm monitors piston rod displacement in real time. The piston rod end utilizes a clevis-type hinge seat made of quenched and tempered 40Cr alloy steel (HRC 35-40 hardness). It is secured to the door panel's rear bracket via gas shielded welding. The weld groove is precisely machined to a 35° angle, and ultrasonic testing after welding confirms the absence of cracks. The cylinder end is connected to a U-shaped base, laser-cut from Q345D steel plate and sandblasted for enhanced adhesion. The connecting pin is a Φ25h6 smooth shaft with a composite coating: a 30μm hard chrome layer (HV900 hardness) followed by a 15μm Teflon coating to reduce the coefficient of friction to below 0.05.

[0041] On-site installation and calibration During the pre-embedded wall phase, the base installation position was calibrated using a total station, with coordinate errors strictly controlled within ±2mm and horizontality deviations ≤0.05°. After the concrete strength reached the required level, the hydraulic cylinder was positioned with the door panel open 85° to calibrate the hinge point. A laser projector projected a crosshair to ensure the coaxiality between the piston rod hinge hole and the wall base hole was ≤0.05mm. The pin was assembled using a low-temperature interference fit process: the pin was first frozen to -30°C to shrink it by 0.05mm, then pressed into the hinge hole to create a 0.02mm interference fit. Finally, a self-lubricating copper alloy sleeve was installed to compensate for thermal deformation (0.05-0.08mm). The hydraulic piping utilizes a dual-channel layout: the rigid pipe is Φ12×1.5mm stainless steel tubing with a bend radius of ≥100mm to avoid stress concentration. The hose is a 4SP four-layer steel wire braided hose with a pressure rating of 25MPa. After installation, the piping undergoes a circulating flushing process to meet NAS Level 7 cleanliness standards.

[0042] Dynamic performance verification After completing 50,000 accelerated fatigue tests (at a load of 150% of the design value), key parameter changes remained within safety limits: pin diameter wear was only 0.002mm (standard ≤ 0.005mm), hydraulic cylinder leakage increased slightly from 0.05mL / min to 0.08mL / min (limit 0.1mL / min), opening and closing time remained at 12.5 seconds (design value ≤ 13 seconds), and hinge looseness was 0.02mm (allowable ≤ 0.05mm). The hydraulic system performed stably during the test, with the proportional valve accurately controlling the door panel opening and closing speed within a range of 10-15 seconds per cycle. When the pressure exceeded the safety threshold of 12MPa, the relief valve instantly responded with unloading protection.

[0043] The activated carbon tank 601 of this embodiment has a slide rail fixedly installed on the bottom; a slot matching the slide rail is provided on the top of the UV disinfection chamber 602; the slide rail and the slot form a detachable plug-in connection structure.

[0044] Precision manufacturing process of slide rails and slots Slide rail processing The slide rails are forged from S30408 ​​stainless steel, forming a 60×40×5mm rectangular profile and milled on a five-axis machining center. The working surfaces of the rails are mirror-polished (Ra ≤ 0.8μm), and the bottom features four mounting holes, each measuring 12mm in diameter, matching the bolt layout of a 601-mm flange for activated carbon canisters. The rail ends feature a 30° guide bevel, extending the length to 600mm (1.5 times the 400mm canister diameter). The surface is hard-chrome plated (20μm thick) for enhanced wear resistance.

[0045] Card slot structure The top of the UV disinfection chamber 602 is laser-cut with a 52 ± 0.1mm deep T-slot, 62mm wide (slide rail width + 2mm tolerance). This slot is inlaid with an ultra-high molecular weight polyethylene wear strip (Shore D65 hardness) with a V-shaped oil guide groove, reducing the insertion and extraction friction coefficient to below 0.15.

[0046] Positioning locking mechanism A spring pin positioning hole (Φ6H7) is provided at the front end of the slide rail; A stainless steel spring lock is installed at the end of the card slot; A "click" sound confirms insertion into place (locking force ≥ 200N); On-site installation operation process Key operating specifications The clearance between the slide rail and the card slot is controlled at 0.5-1.0mm (feeler gauge detection); Plug and unplug test push and pull force ≤ 150N (monitored by digital push and pull force gauge); Apply food grade silicone grease (NLGI 2#) to lubricate the joint surfaces.

[0047] The extended length of the slide rail in this embodiment is greater than 1.5 times the diameter of the activated carbon canister 601; a handle is welded on the top of the activated carbon canister 601.

[0048] Precision manufacturing of slide rail extension structure Dimensional control The slide rail is forged from 304 stainless steel, with a length strictly controlled to 1.55 times the diameter of the activated carbon canister (canister diameter 400mm → slide rail length 620mm). The end is machined with a 30° guide bevel, 80mm long, and the surface is mirror polished (Ra ≤ 0.8μm) and hard chrome plated (20μm thickness).

[0049] Mechanical strengthening design The cross section of the slide rail is a 40×5mm rectangle, with additional reinforcement ribs (3mm in height) in the middle to increase bending rigidity; Finite element analysis verification: maximum deformation ≤ 0.1mm when carrying 200kg; Vibration test: Under 30Hz sweep amplitude, the resonance point should avoid the operating frequency range (2-5Hz); Welding procedure specifications The handle is made of Φ25mm stainless steel pipe bent into a U shape (inner diameter 180mm); TIG welding is used with the tank top (current 90A, argon flow rate 12L / min); The welds are X-ray inspected (in compliance with NB / T 47013.2-2015 Level II standard); Human-computer interaction optimization Operating force test: Single person pulling force ≤ 150N (in compliance with OSHA Ergonomics standards); On-site installation operation process Slide rail installation steps Draw a positioning line on the bottom of the activated carbon tank (parallelism ≤ 0.2mm / m); Drill 4-Φ10.5mm holes (for M10 stainless steel bolts); Apply thread locker (Loctite 243) and pre-tighten the bolts (torque 45 N·m); Laser calibration of slide rail straightness (deviation ≤ 0.15mm / m); Handle operation specifications Hold both ends of the handle with both hands; 30° inclination angle, uniform push and pull (speed 0.3-0.5m / s); After hearing the lock "click", manually confirm again.

[0050] In this embodiment, a temperature sensor probe 71 is embedded at 1 / 2 of the height of the side wall of the storage chamber 1; an air pressure sensor 72 is embedded 10 cm below the top surface of the storage chamber 1; and the probe wire is led out to the outside through a embedded wire tube.

[0051] Pre-buried construction process Positioning and layout coordination with structure During the reinforcement tying phase of the storage room 1 wall, precise positioning is performed according to the design drawings: Temperature sensor probe 71 Starting from the indoor floor elevation, draw a cross reference line at 1 / 2 of the side wall height (if the total height of the storage room is 2.4m, then position it at 1.2m), with an allowable deviation of ≤±3mm.

[0052] Air pressure sensor 72 Position it 100mm away from the bottom of the roof, and avoid the main beam area of ​​the roof by at least 200mm; Pre-buried wire pipe Lay DN32 galvanized steel pipes along the wall corners with a bending radius of ≥200mm; Sensor fixing and sealing Use diamond thin-wall drill to drill a Φ50mm hole (depth 60mm); Insert the probe into the special fixing frame and pour in non-shrinkage epoxy mortar (compressive strength ≥ 60MPa); The wire pipe interface is sealed with explosion-proof putty (width ≥ 20mm).

[0053] Components Technical indicators Detection method Temperature probe burial depth 50±2mm Depth gauge calibration Air pressure sensor level ≤0.5° Electronic level measurement Conduit sealing pressure rating 0.6MPa pressure maintenance without leakage Pressure decay method (GB / T 13927) Conductor insulation resistance ≥100MΩ (500VDC) Megohmmeter test The depth of the annular groove in this embodiment is 80% of the uncompressed height of the silicone gasket; the assembly gap between the inner wall of the groove and the gasket is 0.5 mm.

[0054] Structural parameter implementation details Dimension control benchmark Groove depth The uncompressed height of the silicone gasket is strictly controlled at 15.00±0.05mm (average of three measurements), and the groove depth is set at 12.00±0.02mm (calibrated with a digital vernier caliper) at an 80% ratio.

[0055] Assembly clearance The gap between the inner wall of the groove and the gasket is 0.50±0.05mm (measured with a feeler gauge), which is achieved by precisely matching the outer diameter of the gasket with the groove width (gasket Φ503.6mm, groove width 504.1mm).

[0056] Components Technical indicators Testing standards Silicone gasket (4.1) Shore hardness 70±2°, tear strength ≥25kN / m GB / T 528-2009 Grooved substrate (door panel) Q235B quenched and tempered, hardness HRC28-32 GB / T 231.1-2018 Assembly environment Constant temperature 23±2℃, humidity 50±5%RH ISO 2230:2018 Tooling and assembly process 1. Groove processing technology Rough machining: Use a Φ12mm end mill on a vertical milling machine to slot to a depth of 11.5mm (leave a 0.5mm allowance); Finishing: Replace with a Φ10mm diamond-coated milling cutter, perform layered milling to a depth of 12.00±0.02mm, and achieve a surface roughness of Ra0.8μm.

[0057] Groove wall treatment: Chemical nickel plating (thickness 5μm) reduces the friction coefficient to 0.15.

[0058] Gasket low temperature assembly Assembly force control: Using servo press, pressing speed 0.5mm / s, upper pressure limit 10kN.

[0059] Gap Verification Method Contact detection: Φ0.50mm feeler gauge is evenly distributed at 8 points around the circumference, and the insertion force is ≤1N; Non-contact detection: Laser triangulation rangefinder scans the gap (sampling density 0.1mm / point).

[0060] The sealing surface of the discharge port flange of this embodiment is processed into a conical slope of 15°±1°; the conical slope matches the trapezoidal slope of the silicone gasket.

[0061] Precision machining of tapered flanges Turning Processing the discharge port flange sealing surface on a vertical CNC lathe; Use diamond-coated blades (tip radius 0.2mm); Spindle speed 1200rpm, feed rate 0.05mm / rev; There are two processes: rough turning and fine turning: Rough turning allowance 0.5mm (surface roughness Ra 3.2μm); Finish turning to a taper angle of 15°±0.05° (surface roughness Ra0.4μm).

[0062] Grinding finishing Use a bowl-shaped grinding wheel (grit size 800#) for precision grinding; Online laser goniometer provides real-time feedback on cone angle accuracy; The final surface roughness reaches Ra0.1μm (in line with ISO 1302 standard).

[0063] Match Verification and Assembly Control Detection tools Technical indicators Verification Standards Three-coordinate measuring machine Cone angle tolerance ±0.05° ISO 2768-mK grade Blue light scanner Contour ≤0.02mm ASME Y14.5-2009 Feeler gauge set Matching gap 0.05-0.10mm GB / T 1957-2006 Dynamic seal test Verification of contact surface uniformity: Pressure-sensitive paper (2.5 MPa range) shows that the contact area is >85%.

[0064] Working principle and operation process of this embodiment 1. Establishment of sealed negative pressure environment After the silkworm litter is fed into the storage chamber 1 through the feed port 2, the rotary airtight valve 301 is closed and the sealing cover is covered. The vacuum pump 8 is started to form a constant negative pressure of -0.08 MPa in the storage chamber, and the air flow is directed in a directional manner through the top stainless steel exhaust pipe (201). At this time: Pathogen control mechanism: The airflow containing pathogenic microorganisms is forced to pass through the gas treatment unit 6, avoiding the risk of gas accumulation in traditional static seals; Structural synergy: The air extraction pipe 201 vertically penetrates the center of the top surface of the storage chamber to ensure that the air flow is collected without dead corners.

[0065] 2. Multi-stage purification of gas treatment unit The extracted gas passes through the activated carbon tank 601 and UV disinfection chamber 602 in series: Physical adsorption layer: The activated carbon canister intercepts small molecular pollutants such as H2S and ammonia, with an adsorption rate of >95%; Photochemical inactivation layer: 185nm ultraviolet light directly destroys the DNA structure of microorganisms; The titanium dioxide catalytic mesh produces hydroxyl radicals (·OH) under ultraviolet excitation, which completely decomposes organic toxins; Key structure: The distance between lamp tubes is 80±0.5mm, and the distance between the catalytic screen and the lamp tube is 5±0.2mm.

[0066] 3. Operation guarantee of dynamic sealing structure Feed port operation: When the rotary valve 301 is closed, the silicone seal ring continuously scrapes the inner wall of the channel, eliminating instantaneous leakage; The valve plate axis is designed to be orthogonal to ensure that the rotation plane is perpendicular to the airflow direction.

[0067] Discharge port seal: The hydraulic cylinder drives the door panel, causing the trapezoidal silicone gasket to squeeze the 15° conical flange surface; Self-tightening effect: The gasket expands radially under pressure, accurately filling the 0.5mm gap; The hydraulic system maintains a pressure of 0.6MPa to prevent harmful gas backflow when opening the warehouse.

[0068] 4. Intelligent monitoring of the fermentation process Real-time feedback of parameters: The temperature probe 71 at the half height of the side wall monitors the core temperature of the pile (optimal range of 55-70°C); The air pressure sensor 72 10 cm below the top surface captures the state of gas accumulation and triggers an alarm when the limit is exceeded.

[0069] Adaptive control: When the temperature is greater than 65℃, the vacuum pump automatically speeds up to enhance the extraction; When the air pressure fluctuation is greater than 0.005MPa, the system will suspend operation and check for sealing failure points.

[0070] 5. Discharging and regeneration stage Safe discharging process: The negative pressure system is shut down 24 hours in advance and residual gas is replaced by natural ventilation; Open the hydraulic sealing door, and the hydraulic cylinder retracts the door panel at a uniform speed of 10 seconds per time; The decomposed silkworm excrement slides out through the inclined surface of the discharge port 3.

[0071] Modular maintenance: The activated carbon canister is pulled out along the slide rail and replaced (taking less than 5 minutes); The UV lamp should be replaced after 8000 hours of cumulative operation, and the catalytic screen should be regenerated at 450℃.

[0072] It will be understood that the present invention is described by way of certain embodiments, and it will be appreciated by those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A silkworm excrement processing device with negative pressure collection, comprising a storage chamber, a feed port provided at the top of the storage chamber, and a discharge port provided at the side of the storage chamber, characterized in that: A stainless steel negative pressure exhaust pipe is vertically provided through the center of the top surface of the storage chamber, and the diameter of the pipe is 20 cm; The upper end of the negative pressure exhaust pipe is connected to a gas processing unit through a flange, and the gas processing unit includes an activated carbon tank and a UV disinfection cabin connected in series; The exhaust port of the gas processing unit is connected to the air inlet of the vacuum pump.

2. The silkworm excrement processing device with negative pressure collection according to claim 1, characterized in that: Two 185nm ultraviolet lamps are fixed in parallel inside the UV disinfection chamber, and a titanium dioxide catalytic mesh is filled between the two lamps.

3. The silkworm excrement processing device with negative pressure collection according to claim 1, characterized in that: A rotary airtight valve is installed inside the feed inlet channel; The airtight valve comprises a circular valve plate, the diameter of which is equal to the inner diameter of the feed inlet channel; The valve plate is rotated by a rotating shaft that transversely passes through the side wall of the feed channel; An annular groove is provided on the edge of the valve plate, and a silicone sealing ring is embedded in the groove.

4. The silkworm excrement processing device with negative pressure collection according to claim 1, characterized in that: The discharge port is equipped with a hydraulic sealing door structure; The hydraulic sealing door structure includes a steel door panel, which is connected to the embedded parts of the outer wall of the discharge port through a hinge; An annular groove is processed on the inner surface of the door panel, and an annular hollow silicone gasket with a trapezoidal cross section is embedded in the groove.

5. The silkworm excrement processing device with negative pressure collection according to claim 4, characterized in that: The hydraulic sealing door structure also includes a hydraulic cylinder; The piston rod end of the hydraulic cylinder is hinged to the bracket on the back side of the door panel; The cylinder end of the hydraulic cylinder is hinged to the pre-embedded base of the wall.

6. The silkworm excrement processing device with negative pressure collection according to claim 1, characterized in that: The bottom of the activated carbon tank is fixed with a slide rail; A slot matching the slide rail is provided on the top of the UV disinfection chamber; The slide rail and the slot form a separable plug-in connection structure.

7. The silkworm excrement processing device with negative pressure collection according to claim 6, characterized in that: The extended length of the slide rail is greater than 1.5 times the diameter of the activated carbon canister; A handle is welded on the top of the activated carbon tank.

8. The silkworm excrement processing device with negative pressure collection according to claim 1, characterized in that: A temperature sensor probe is embedded at 1 / 2 of the height of the storage chamber side wall; An air pressure sensor is embedded 10 cm below the top surface of the storage chamber; The probe wire is led out to the outside through a pre-buried wire tube.

9. The silkworm excrement processing device with negative pressure collection according to claim 4, characterized in that: The depth of the annular groove is 80% of the uncompressed height of the silicone gasket; The assembly gap between the inner wall of the groove and the gasket is 0.5 mm.

10. The silkworm excrement processing device with negative pressure collection according to claim 4, characterized in that: The sealing surface of the discharge port flange is processed into a conical slope of 15°±1°; The conical inclined surface matches the trapezoidal inclined surface of the silicone gasket.

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