A constant temperature delivery device for lignin adhesive

Abstract

The utility model discloses a food processing technical field's lignin adhesive constant temperature conveying device, including constant temperature conveying body and air pump, the top of constant temperature conveying body is assembled with the inlet pipe, and the top of inlet pipe is assembled with lignin adhesive feed hopper, the side wall upper end of lignin adhesive feed hopper is assembled with the connecting ring, and the driving end of connecting ring and air pump is connected through siphon tube component, siphon tube component includes the siphon tube a of installation in the driving end of air pump, connecting body and the siphon tube b of installation in connecting ring, and the both ends of connecting body all are set up with the sealed mouth, and the siphon tube a is inserted in left sealed mouth, the setting of this lignin adhesive constant temperature conveying device, through setting constant temperature conveying body lignin adhesive feed hopper, can ensure that lignin adhesive is always in suitable temperature in the conveying process, effectively avoids the viscosity change caused by temperature fluctuation, guarantees the coating performance and adhesion effect of adhesive, improves product quality stability.

Description

Technical Field

[0001] This utility model relates to the field of conveying device technology, specifically a constant temperature conveying device for lignin adhesive. Background Technology

[0002] Lignin adhesives, as environmentally friendly adhesives derived from plant fibers, are increasingly widely used in fields such as engineered wood products and furniture manufacturing. Their performance is significantly affected by temperature; temperature fluctuations can easily lead to changes in adhesive viscosity, thus affecting coating uniformity and bonding strength. Existing adhesive conveying devices have several shortcomings: First, they lack an effective constant temperature control mechanism, resulting in unstable temperatures during conveying and potential degradation of adhesive performance. Second, the connection between the conveying power component and the feeding structure is not sufficiently sealed, easily leading to air leakage or adhesive leakage, affecting conveying efficiency. Third, material accumulation and bridging are prone to occur inside the feeding hopper, causing poor material supply. Fourth, they lack precise level monitoring methods, making it difficult to monitor the remaining material in the feeding hopper in real time, easily leading to material interruption or overflow. Fifth, the filtration and sealing design of key components such as the siphon assembly is inadequate, and impurities or sealing failure can affect the purity of the adhesive and the stability of conveying. To address the aforementioned issues, the development of a lignin adhesive conveying device that can achieve constant temperature conveying, reliable sealing, stable material supply, and easy monitoring has become an urgent need in the industry. Utility Model Content

[0003] The purpose of this invention is to provide a constant temperature conveying device for lignin adhesives to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a lignin adhesive constant temperature conveying device, comprising a constant temperature conveying body and an air pump, wherein the top end of the constant temperature conveying body is equipped with an inlet pipe, and the top end of the inlet pipe is equipped with a lignin adhesive feed hopper. The upper side wall of the lignin adhesive feed hopper is equipped with a connecting ring, and the connecting ring and the drive end of the air pump are connected through a siphon tube assembly. The siphon assembly includes a siphon a installed at the air pump drive end, a connector, and a siphon b installed in the connecting ring; Both ends of the connector are provided with sealing ports. The siphon tube a is inserted into the sealing port on the left side, and the siphon tube b is inserted into the sealing port on the right side. The siphon tube a is equipped with a limiting ring at one end inside the connector, and a filter screen is embedded inside the limiting ring; The outer wall of the siphon tube b is provided with external threads, and the inner wall of the connector is provided with internal threads.

[0005] As a preferred embodiment of the lignin adhesive constant temperature conveying device of this utility model, the connecting body is provided with a sealing component inside, and the sealing component is sleeved on the outside of the siphon tube b. The sealing component includes a rubber pad a and a rubber pad b sleeved on the outside of the siphon tube b.

[0006] In a preferred embodiment of the lignin adhesive constant temperature conveying device of this utility model, a rubber block is assembled between the rubber pad a and the rubber pad b.

[0007] In a preferred embodiment of the lignin adhesive constant temperature conveying device of this utility model, the outer diameter of the limiting ring is larger than the inner diameter of the sealing opening.

[0008] As a preferred embodiment of the lignin adhesive constant temperature conveying device of this utility model, the lignin adhesive feed hopper is equipped with a feeding structure inside. The feeding structure includes a crossbar, an electric push rod, an annular pad, and an umbrella-shaped cylinder. The crossbar is installed inside the lignin adhesive feed hopper, the electric push rod is installed on the crossbar, the annular pad is installed inside the lignin adhesive feed hopper, and the umbrella-shaped cylinder is installed on the output end of the electric push rod.

[0009] As a preferred embodiment of the lignin adhesive constant temperature conveying device of this utility model, a through hole is provided on the side wall of the lignin adhesive feed hopper, and a tuning fork level gauge is installed in the through hole.

[0010] As a preferred embodiment of the lignin adhesive constant temperature conveying device of this utility model, a discharge pipe is installed at the lower end of the side wall of the constant temperature conveying body.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the setting of the lignin adhesive constant temperature conveying device has a reasonable structural design; By setting up a constant-temperature conveyor for lignin adhesive feeding hopper, it is possible to ensure that the lignin adhesive is always at a suitable temperature during the conveying process, effectively avoiding viscosity changes caused by temperature fluctuations, ensuring the coating performance and bonding effect of the adhesive, and improving product quality stability. In the lignin adhesive feed hopper of the siphon assembly, the connecting lignin adhesive feed hopper is connected to the lignin adhesive feed hoppers of siphon tube a and siphon tube b through a sealing port. The external thread of the lignin adhesive feed hopper of siphon tube b matches the internal thread of the connecting lignin adhesive feed hopper. Combined with the sealing assembly lignin adhesive feed hopper, rubber gasket b lignin adhesive feed hopper, and rubber block lignin adhesive feed hopper, the sealing performance between the air pump lignin adhesive feed hopper and the feed hopper lignin adhesive feed hopper is significantly enhanced, reducing air leakage, improving air pump drive efficiency, and ensuring the continuity of adhesive delivery. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the lignin adhesive feed hopper of this utility model; Figure 3 This is a schematic diagram of the siphon tube assembly of this utility model; Figure 4 This is an exploded view of the siphon tube assembly of this utility model.

[0013] In the diagram: 1. Thermostatic conveyor; 2. Air pump; 3. Siphon assembly; 4. Connecting ring; 5. Lignin adhesive feed hopper; 6. Feed pipe; 7. Through hole; 8. Tuning fork level gauge; 9. Feeding structure; 901. Crossbar; 902. Electric push rod; 903. Annular pad; 904. Umbrella-shaped cylinder; 10. Siphon a; 11. Connector; 12. Siphon b; 13. External thread; 14. Limiting ring; 15. Sealing port; 16. Internal thread; 17. Rubber pad a; 18. Rubber block; 19. Rubber pad b; 20. Discharge pipe. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-4 This utility model provides a technical solution: In this technical solution, a lignin adhesive constant temperature conveying device includes a constant temperature conveying body 1 and an air pump 2. The top of the constant temperature conveying body 1 is equipped with an inlet pipe 6, and the top of the inlet pipe 6 is equipped with a lignin adhesive feed hopper 5. A connecting ring 4 is installed on the upper side wall of the lignin adhesive feed hopper 5. The connecting ring 4 and the drive end of the air pump 2 are connected through a siphon tube assembly 3. The siphon tube assembly 3 includes a siphon tube a10 installed on the drive end of the air pump, a connecting body 11, and a siphon tube b12 installed in the connecting ring 4. Both ends of the connecting body 11 are provided with sealing ports 15. The siphon tube a10 is inserted into the left sealing port 15, and the siphon tube b12 is inserted into the right sealing port 15. A limiting ring 14 is installed at the end of the siphon tube a10 located inside the connecting body 11, and a filter screen is embedded inside the limiting ring 14. The outer wall of the siphon tube b12 is provided with an external thread 13, and the inner wall of the connecting body 11 is provided with an internal thread 16.

[0016] Thermostatic conveyor hopper 1: Made of 304 stainless steel, with a 5mm thick high-temperature resistant silicone insulation layer on the inner wall. The operating temperature range is set from 40℃ to 60℃ (with an error of ±1℃), and the volume is from 50L to 200L, adaptable to production scale. It is equipped with a PT100 temperature sensor and a 2kW heating element, and the temperature is automatically adjusted via a PLC control system. Air pump lignin adhesive feed hopper 2: Uses an oil-free vortex air pump with a rated power of 1.5kW, a maximum air pressure of 80kPa, and an exhaust volume of 0.6m³ / min. Equipped with a pressure regulating valve, the output pressure can be adjusted according to the adhesive viscosity (500mPa·s - 5000mPa·s). Feed pipe 6: The feed pipe is made of DN50 food-grade PVC lignin adhesive, with a length of 300-500mm. It is connected to the constant temperature conveyor 1 and feed hopper 5 by flange connection, and the flange gasket is made of oil-resistant nitrile rubber. Lignin adhesive feed hopper 5: It has a conical structure with an upper diameter of 800mm, a lower diameter of 150mm, and a height of 1000mm. It is made of 316L stainless steel and the inner wall is mirror polished (roughness Ra≤0.8μm) to reduce material adhesion. The connecting ring lignin adhesive feed hopper 4 is forged from stainless steel of the same material as the feed hopper 5. Its inner diameter matches the outer diameter of the siphon lignin adhesive feed hopper b12 (e.g., lignin adhesive feed hopper DN32). It is fixed to the feed hopper 5 by welding, and the weld is passivated to prevent corrosion. Siphon assembly lignin adhesive feed hopper 3: Siphon lignin adhesive feed hopper a10 and siphon lignin adhesive feed hopper b12 are both DN32 seamless steel pipes with a wall thickness of 3mm and lengths of 500mm and 300mm respectively; Connector lignin adhesive feed hopper 11 is a cylindrical structure with sealed ends lignin adhesive feed hopper 15, with an inner diameter of 50mm and a length of 200mm, made of 45 steel with chrome plating. The sealed lignin adhesive feed hopper 15 has an inner diameter of 32mm, a depth of 50mm, an inner wall roughness of Ra≤1.6μm, and a 15° chamfer at the port to facilitate siphon tube insertion.

[0017] Limiting ring lignin adhesive feed hopper 14: Made of polytetrafluoroethylene, with an outer diameter of 40mm, an inner diameter of 28mm, and a thickness of 10mm; the embedded filter screen is made of 304 stainless steel woven mesh with a mesh count of 80 (capable of intercepting impurities ≥180μm), and is fixed to the limiting ring by a snap-fit ​​method for easy disassembly and cleaning.

[0018] External thread lignin adhesive feeder 13 and internal thread lignin adhesive feeder 16: both are fine-pitch threads of M36×2 lignin adhesive feeders, with a fitting accuracy of 6H / 6g and a thread length of 80mm. During assembly, apply food-grade thread sealant (such as Loctite 567) to enhance sealing.

[0019] In some technical solutions, a sealing component is provided inside the connector 11, and the sealing component is sleeved on the outside of the siphon tube b12. The sealing component includes a rubber pad a17 and a rubber pad b19 sleeved on the outside of the siphon tube b12.

[0020] Rubber pad lignin adhesive feed hoppers a17 and b19: both are made of oil-resistant EPDM rubber, with a Shore hardness of 70±5A, a thickness of 10mm, an inner diameter of 32mm, and an outer diameter of 50mm. Rubber pad lignin adhesive feed hopper a17 is located near the end of the connecting body hopper 11, while rubber pad lignin adhesive feed hopper b19 is 50mm away from the middle of the connecting body. Both have 2mm rounded edges to prevent scratches during assembly.

[0021] In some technical solutions, a rubber block 18 is assembled between rubber pad a17 and rubber pad b19.

[0022] The material is the same as the rubber gasket, with a cylindrical structure, a diameter of 50mm, a length of 30mm, and a 32mm through hole in the center. The contact surfaces of the rubber block and the rubber gasket (a17, b19) are fitted with a concave-convex fit (the height of the boss is 2mm, and the depth of the groove is 2mm) to enhance the overall sealing performance.

[0023] In some technical solutions, the outer diameter of the limiting ring 14 is larger than the inner diameter of the sealing port 15.

[0024] The dimensional fit between the limiting ring (lignin adhesive feed hopper 14) and the sealing port (lignin adhesive feed hopper 15) is as follows: the outer diameter of the limiting ring is 40mm, and the inner diameter of the sealing port (lignin adhesive feed hopper 15) is 32mm. There is an 8mm radial gap between the two to ensure that the limiting ring can tightly fit the sealing port end face after the siphon tube (lignin adhesive feed hopper a10) is inserted. A 0.5mm thick nitrile rubber gasket is attached to the side of the limiting ring facing the sealing port to further enhance the seal.

[0025] In some technical solutions, the lignin adhesive feed hopper 5 is equipped with a feeding structure 9. The feeding structure 9 includes a crossbar 901, an electric push rod 902, an annular pad 903, and an umbrella-shaped cylinder 904. The crossbar 901 is installed inside the lignin adhesive feed hopper 5, the electric push rod 902 is installed on the crossbar 901, the annular pad 903 is installed inside the lignin adhesive feed hopper 5, and the umbrella-shaped cylinder 904 is installed on the output end of the electric push rod 902.

[0026] 901 lignin adhesive feed hopper with crossbar: It adopts a DN20 stainless steel round tube for lignin adhesive feed hopper, with a length of 700mm. Both ends are fixed to the bracket on the inner wall of the feed hopper with bolts (the height of the bracket is 300mm from the top of the feed hopper). The load-bearing capacity is ≥50kg. Electric push rod lignin adhesive feed hopper 902: Uses DC servo electric push rod, rated voltage 24V, thrust 500N, stroke 150mm, speed 50mm / s, equipped with limit switch to prevent overtravel, operating temperature 60℃. 903 Annular Pad Lignolac Adhesive Feed Hopper: A stainless steel circular ring with an inner diameter of 200mm, an outer diameter of 750mm, a thickness of 5mm, and a distance of 200mm from the bottom of the feed hopper. The gap between the inner wall and the outer wall of the umbrella-shaped cylindrical 904 lignin adhesive feed hopper is controlled at 8mm. Umbrella-shaped lignin adhesive feed hopper 904: Made of polytetrafluoroethylene, with an upper diameter of 180mm, a lower diameter of 50mm, a height of 200mm, and an outer wall slope of 30°. The top is connected to the output shaft of the electric push rod lignin adhesive feed hopper 902 via a flange (flange diameter 80mm, bolt specification M8×20). Missing technical features: The control logic of the feeding structure is not described. It is recommended to add a linkage program with the tuning fork level gauge lignin adhesive feed hopper 8. When the material level is lower than the set value, the electric push rod reciprocates once every 30 seconds (stroke 100mm) to prevent material bridging. The wear-resistant treatment of the umbrella-shaped cylinder is not mentioned. It is recommended to spray a polytetrafluoroethylene coating (thickness 50μm) on the outer wall to reduce the coefficient of friction.

[0027] In some technical solutions, a through hole 7 is provided on the side wall of the lignin adhesive feed hopper 5, and a tuning fork level gauge 8 is installed in the through hole 7.

[0028] Through-hole lignin adhesive feed hopper 7: 50mm in diameter, located on the side wall of feed hopper 5 (400mm from the top of feed hopper). A DN50 lignin adhesive feed hopper flange is welded to the opening for mounting a level gauge. Tuning fork level gauge for lignin adhesive feed hopper 8: A corrosion-resistant tuning fork level gauge is selected. Measuring range: 0-1000mm (corresponding to feed hopper height). Resolution: 1mm. Output signal: 20mA. Power supply voltage: 220VAC. Fork material: 316L stainless steel. Fork length: 150mm. Fork width: 30mm. Suitable for media viscosity ≤10000mPa・s.

[0029] In some technical solutions, a discharge pipe 20 is installed at the lower end of the side wall of the constant temperature conveyor 1.

[0030] The discharge pipe lignin adhesive feed hopper 20 is made of DN40 stainless steel and is 200mm long. It is connected to the constant temperature conveyor 1 by welding (with a 5° slope for easy discharge). A DN40 manual ball valve is installed at the end (made of 304 stainless steel with a PTFE sealing surface). The valve operating torque is ≤30N・m.

[0031] Work process Initial preparation stage: First, check the connection status of each component of the device to ensure that the threaded connection of the siphon tube assembly lignin adhesive feed hopper 3 is tight (the external thread lignin adhesive feed hopper 13 and the internal thread lignin adhesive feed hopper 16 are screwed in place), and the sealing components (rubber pad lignin adhesive feed hopper a17, rubber pad lignin adhesive feed hopper b19 and rubber block lignin adhesive feed hopper 18) are in an effective compression state (compression amount lignin adhesive feed hopper 3 - lignin adhesive feed hopper 5mm). Start the PLC control system of the lignin adhesive feed hopper 1 of the constant temperature conveyor, set the target temperature (e.g., 50℃), the heating element starts working, the PT100 temperature sensor monitors the internal temperature in real time, and adjusts the heating power through the PID algorithm to stabilize the internal temperature of the lignin adhesive feed hopper 1 within the set value ±1℃. Material addition stage: Pour the lignin adhesive into the lignin adhesive feed hopper 5. The tuning fork level gauge in the lignin adhesive feed hopper 8 monitors the liquid level of the material in the hopper through the through-hole lignin adhesive feed hopper 7. When the liquid level reaches the set high level (e.g., 200mm from the upper lignin adhesive feed hopper), an audible and visual alarm is issued to stop feeding. If the liquid level is lower than the set low level (e.g., 300mm from the lower lignin adhesive feed hopper), the feeding structure lignin adhesive feed hopper 9 is triggered to start. In the feeding structure, the electric push rod drives the umbrella-shaped cylinder 904 to move up and down along the inner wall of the annular pad 903 (stroke 100mm, once every 30 seconds). The inclined surface of the umbrella-shaped cylinder pushes the material, breaking the bridging phenomenon and ensuring that the material flows smoothly to the feed pipe 6. Power supply stage: Start the air pump lignin adhesive feed hopper 2, and adjust the output pressure to a value matching the viscosity of the adhesive through the pressure regulating valve (e.g., adjust to 50kPa when the viscosity of the lignin adhesive feed hopper is 3000mPa・s). The gas enters the connecting body lignin adhesive feed hopper 11 through the siphon pipe lignin adhesive feed hopper a10, and is filtered by the limit ring lignin adhesive feed hopper 14 and the lignin adhesive feed hopper 80 embedded in the lignin adhesive feed hopper mesh to intercept impurities ≥180μm. The filtered gas enters the upper space of the feed hopper 5 via the siphon pipe, creating positive pressure inside the hopper (pressure range 30-70 kPa), which pushes the adhesive along the feed pipe 6 towards the constant temperature conveyor 1. Constant Temperature Maintenance Stage: After the adhesive enters the constant temperature conveying body lignin adhesive feed hopper 1, heat loss is reduced by the insulation layer (5mm thick high-temperature resistant silicone). The heating tube continuously replenishes heat, the PT100 lignin adhesive feed hopper sensor provides real-time temperature data feedback, and the PLC lignin adhesive feed hopper system dynamically adjusts to ensure that the adhesive is always in the set temperature environment during the conveying process, avoiding viscosity changes due to temperature fluctuations (stable within the range of 500mPa・s from 500mPa・s). Material discharge stage: When the amount of adhesive in the lignin adhesive feed hopper 1 of the constant temperature conveyor reaches a certain level, open the manual ball valve at the end of the discharge pipe lignin adhesive feed hopper 20. The adhesive flows out along the discharge pipe under its own gravity and internal pressure (pipe slope 5° to accelerate flow). If precise flow control is required, the flow data can be monitored in real time by a DN40 electromagnetic flowmeter connected in series (measuring range 0-50L / min), and fed back to the lignin adhesive feed PLC system to adjust the valve opening and stabilize the flow rate at the set value (e.g., 20L / min). During the discharge process, the lignin adhesive feed hopper wrapped with a 30mm thick rock wool insulation layer prevents the adhesive from cooling down and solidifying. Shutdown and Cleaning Phase: After the conveying process is completed, turn off the air pump and the heating pipe. After the constant temperature conveyor body cools down to room temperature, disassemble the siphon assembly and clean the filter screen inside the limit ring. Drive the umbrella-shaped cylinder to the lowest position through the electric push rod of the feeding structure to clean the residual material inside the feed hopper. Open the ball valve of the discharge pipe to drain the remaining adhesive in the constant temperature conveyor body, completing the equipment cleaning. Working principle Pneumatic conveying principle: Compressed gas generated by the air pump in the lignin adhesive feed hopper 2 enters the upper part of the feed hopper 5 via the siphon assembly in the lignin adhesive feed hopper 3, creating a positive pressure environment inside the hopper. The pressure difference overcomes the flow resistance of the adhesive, propelling the material along the feed pipe in the lignin adhesive feed hopper 6 towards the constant temperature conveyor body in the lignin adhesive feed hopper 1. The sealing structure in the siphon assembly (threaded seal + rubber gasket seal) ensures no gas leakage and stable air pressure; the limit ring in the lignin adhesive feed hopper 14 and the filter screen intercept impurities, preventing them from entering the air pump or adhesive and affecting equipment operation and product quality. Thermostatic Control Principle: The thermostatic conveyor lignin adhesive feed hopper adopts closed-loop control logic. The PT100 lignin adhesive feed hopper temperature sensor converts the detected temperature signal into an electrical signal and transmits it to the lignin adhesive feed hopper PLC. The PLC compares the actual temperature with the set temperature and controls the on / off state of the heating element or adjusts the power (a 2kW heating element can achieve 0-100% power output), maintaining the internal temperature within the set range. The insulation layer reduces heat transfer to the outside, lowers energy loss, and ensures the adhesive maintains a stable viscosity at a suitable temperature. Anti-bridging and level monitoring principle: The lignin adhesive feed hopper 9 has an umbrella-shaped cylinder. When the lignin adhesive feed hopper 904 moves up and down, its outer wall and the annular pad 903 form a shearing force between the inner wall of the lignin adhesive feed hopper 5 and the lignin adhesive feed hopper - lignin adhesive feed hopper 8mm gap, breaking the agglomerated structure of the adhesive and preventing bridging of materials in the conical part of the feed hopper; the tuning fork level gauge is based on the principle that the vibration frequency of the tuning fork changes with the material contact state (the vibration frequency is stable when empty and decreases when in contact with materials), realizing real-time monitoring and alarm of the material level, ensuring continuous feeding. Sealing and Limiting Principle: The threaded connection of the siphon assembly (M36×2 fine thread) provides an initial seal, which, together with the elastic deformation of the rubber gaskets (a17, b19) and the rubber block (18), fills the gap to achieve multiple seals. The outer diameter (40mm) of the limiting ring (14) is larger than the inner diameter (32mm) of the sealing port (15), limiting the insertion depth of the siphon tube (a10). At the same time, the nitrile rubber gasket on its end face further enhances the fit and seal with the sealing port, preventing gas leakage from the connection gap.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A lignin adhesive constant temperature conveying device, comprising a constant temperature conveying body (1) and an air pump (2), characterized in that: The top of the constant temperature conveyor (1) is equipped with a feed pipe (6), and the top of the feed pipe (6) is equipped with a lignin adhesive feed hopper (5). The upper side wall of the lignin adhesive feed hopper (5) is equipped with a connecting ring (4), and the connecting ring (4) and the drive end of the air pump (2) are connected through a siphon assembly (3). The siphon assembly (3) includes a siphon a (10) installed at the air pump drive end, a connector (11), and a siphon b (12) installed in the connecting ring (4). Both ends of the connector (11) are provided with sealing ports (15), the siphon tube a (10) is inserted into the sealing port (15) on the left side, and the siphon tube b (12) is inserted into the sealing port (15) on the right side; The siphon tube a (10) is equipped with a limiting ring (14) at one end inside the connector (11), and a filter screen is embedded inside the limiting ring (14); The outer wall of the siphon tube b (12) is provided with an external thread (13), and the inner wall of the connector (11) is provided with an internal thread (16).

2. The lignin adhesive constant temperature conveying device according to claim 1, characterized in that, The connector (11) is provided with a sealing component inside, and the sealing component is sleeved on the outside of the siphon tube b (12). The sealing component includes a rubber pad a (17) and a rubber pad b (19) sleeved on the outside of the siphon tube b (12).

3. The lignin adhesive constant temperature conveying device according to claim 2, characterized in that, A rubber block (18) is assembled between the rubber pad a (17) and the rubber pad b (19).

4. The lignin adhesive constant temperature conveying device according to claim 1, characterized in that, The outer diameter of the limiting ring (14) is larger than the inner diameter of the sealing port (15).

5. The lignin adhesive constant temperature conveying device according to claim 1, characterized in that, The lignin adhesive feed hopper (5) is equipped with a feeding structure (9). The feeding structure (9) includes a crossbar (901), an electric push rod (902), an annular pad (903), and an umbrella-shaped cylinder (904). The crossbar (901) is installed inside the lignin adhesive feed hopper (5), the electric push rod (902) is installed on the crossbar (901), the annular pad (903) is installed inside the lignin adhesive feed hopper (5), and the umbrella-shaped cylinder (904) is installed on the output end of the electric push rod (902).

6. The lignin adhesive constant temperature conveying device according to claim 5, characterized in that, A through hole (7) is provided on the side wall of the lignin adhesive feed hopper (5), and a tuning fork level gauge (8) is installed in the through hole (7).

7. The lignin adhesive constant temperature conveying device according to claim 1, characterized in that, The lower end of the side wall of the constant temperature conveyor (1) is equipped with a discharge pipe (20).

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