Continuous extraction equipment for low-melting-point copolyamide

Abstract

The utility model relates to the technical field of copolyamide, and discloses low-melting-point copolyamide continuous extraction equipment which comprises a ladder assembly, a lifting assembly is arranged on the rear portion of the inner side of the ladder assembly, a pump box is arranged in the middle of the top end of the ladder assembly, and a heat recovery assembly is arranged in front of the pump box. And a left extraction tank is arranged on the left side of the heat recovery assembly. According to the utility model, the pump box, the heat recovery assembly, the left extraction tank and the right extraction tank are arranged to form a whole set of extraction heat recovery mechanism, and meanwhile, the first-layer frame body, the second-layer frame body and the third-layer frame body are matched to sequentially form a second-stage extraction heat recovery mechanism and a third-stage extraction heat recovery mechanism from top to bottom in a trapezoid shape; the three groups of mechanisms are independent from one another, so that the temperature among the extraction mechanisms can be accurately controlled during extraction, a stable temperature gradient is established, the extraction water and the copolyamide are in full countercurrent contact, and the production energy consumption is reduced while the extraction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of copolyamide, in particular to continuous extraction equipment for low-melting-point copolyamide. Background Art

[0002] Low-melting-point copolyamide is a modified polymer material with a lower melting point than conventional polyamide (PA). Due to the polar groups in its molecular chain, this material exhibits excellent adhesion to many polar materials. It also boasts a narrow melting range, a high softening point, rapid curing, resistance to dry cleaning with organic solvents, and environmental friendliness during use. Therefore, it has found widespread application in hot-melt adhesives, nonwovens, engineering plastics, and other fields.

[0003] Currently, there are two different extraction processes for low-melting-point copolyamide chips: indirect extraction and continuous extraction. The continuous extraction process often utilizes countercurrent contact. Water enters the extraction apparatus from one end, and the low-melting-point copolyamide enters from the other. The two flow in opposite directions and come into contact with each other within the apparatus. For example, in a multi-stage countercurrent extraction apparatus, the extraction water enters the lowest extraction tank, where it is heated and flows upward, while the copolyamide chips enter from the top of the first extraction tank and flow downward under gravity. This process ensures sufficient countercurrent contact between the water and the copolyamide, improving extraction efficiency.

[0004] However, in actual operation, since the extraction water flows upward while the low-melting-point copolyamide flows downward under the action of gravity, in order to ensure more sufficient countercurrent contact between the extraction water and the low-melting-point copolyamide, it is necessary to ensure that the extraction water temperature is distributed in a gradient. This requires precise control of the water temperature, resulting in the consumption of more electricity and increased production costs. At the same time, after the existing extraction water completes the countercurrent contact with the low-melting-point copolyamide, it will be directly discharged from the overflow port, causing a lot of heat in the extraction water to be lost, resulting in a waste of heat resources. Therefore, it is necessary to provide a low-melting-point copolyamide continuous extraction equipment to solve the above problems. Utility Model Content

[0005] (1) Technical problems solved

[0006] In response to the shortcomings of the existing technology, the utility model provides a low-melting-point copolyamide continuous extraction device, which solves the problem that the existing extraction equipment consumes a large amount of electricity to ensure that the temperature of the extraction water is gradiently distributed during operation, and at the same time, the direct discharge of the extraction water causes a waste of heat resources.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: low-melting-point copolyamide continuous extraction equipment, including a ladder frame assembly, a lifting assembly is provided at the rear of the inner side of the ladder frame assembly, a pump box is provided in the middle of the top of the ladder frame assembly, a heat recovery assembly is provided in front of the pump box, a left extraction tank is provided on the left side of the heat recovery assembly, a right extraction tank is provided on the right side of the heat recovery assembly, an overflow pipe is connected between the heat recovery assembly and the left extraction tank and the right extraction tank, a liquid inlet pipe is provided on the left and right sides of the upper end of the heat recovery assembly, a discharge pipe is provided at the lower ends of the left extraction tank and the right extraction tank, a circulating water tank is provided below the pump box, and a delivery pipe is connected between the circulating water tank and the pump box.

[0009] Optionally, the ladder frame assembly includes a bottom bracket, a first-layer frame, a second-layer frame, a third-layer frame, guardrails and stairs, a first-layer frame is provided on the rear side of the upper end of the bottom bracket, a second-layer frame is provided on the rear side of the upper end of the first-layer frame, a third-layer frame is provided on the rear side of the upper end of the second-layer frame, guardrails are provided on the outer sides of the upper ends of the first-layer frame, the second-layer frame and the third-layer frame, stairs are provided on the left and right sides of the front end of the first-layer frame, the second-layer frame and the third-layer frame.

[0010] Optionally, the lifting assembly includes a layered box, a conveying frame, a winder and a protective door. The conveying frame is provided inside the layered box, a winder is provided in the middle of the top of the layered box, and a protective door is slidably installed on the inner side of the front end of the layered box.

[0011] Optionally, the heat recovery component includes a circular base, an outer ring frame, an outer cylinder, a tightening ring, an inner cylinder, a liquid inlet, a return water port, a liquid outlet and a drain pipe. The upper end of the circular base is provided with an outer ring frame, the inner side of the upper end of the outer ring frame is provided with an outer cylinder, the upper end of the outer ring frame is provided with a tightening ring, the inner part of the outer cylinder is provided with an inner cylinder, liquid inlets are provided on the left and right sides of the upper end of the inner cylinder, return water ports are provided on both sides of the middle part of the outer end of the outer cylinder, liquid outlets are provided on both sides below the outer end of the outer cylinder, and a drain pipe is provided at the lower end of the outer cylinder.

[0012] Optionally, the left extraction tank includes a tank body, a heating device, a stirring device, a feed hopper and an electric valve. A heating device is provided on the left side of the outer end of the tank body, a stirring device is provided in the middle of the upper end of the tank body, a feed hopper is provided on the front side of the upper end of the tank body, and an electric valve is provided at the lower end of the tank body.

[0013] Optionally, the lifting components are symmetrically distributed in two groups on the left and right, the pump box and the heat recovery components are each trapezoidally distributed in three groups, the left extraction tank and the right extraction tank are symmetrically distributed, the pump box, the heat recovery component, the left extraction tank and the right extraction tank constitute a set of extraction heat recovery mechanism, and the extraction heat recovery mechanism is divided into a first-level extraction heat recovery mechanism, a second-level extraction heat recovery mechanism and a third-level extraction heat recovery mechanism from top to bottom.

[0014] Optionally, the floor area of ​​the first-layer frame is twice that of the second-layer frame, the floor area of ​​the second-layer frame is twice that of the third-layer frame, the first-layer frame, the second-layer frame and the third-layer frame are all vertically installed on the upper end of the bottom bracket at the rear side, and the first-layer frame, the second-layer frame and the third-layer frame form a trapezoidal structure.

[0015] Optionally, the inner cylinder is formed into a whole by two semi-cylinders and a top cover, and a gap is opened in the middle of the two semi-cylinders. The outer cylinder and the return water port are connected to each other, the liquid outlet and the inner cylinder are connected through a pipeline, and the contact end of the liquid outlet and the outer cylinder is sealed.

[0016] In summary, the technical effects and advantages of the utility model are:

[0017] 1. The utility model has a reasonable structure. The pump box, heat recovery component, left extraction tank and right extraction tank are arranged, and the four are interconnected through the overflow pipe and the liquid inlet pipe to form a complete set of extraction heat recovery mechanism. At the same time, with the first-layer frame, the second-layer frame and the third-layer frame in the ladder frame assembly, a secondary extraction heat recovery mechanism and a tertiary extraction heat recovery mechanism are formed in a trapezoidal shape from top to bottom. The three groups of extraction heat recovery mechanisms exist independently of each other, ensuring that the temperature between the extraction mechanisms at each level can be accurately controlled during extraction, establishing a stable temperature gradient, and allowing the extraction water to achieve sufficient countercurrent contact with the copolyamide, thereby improving the extraction efficiency and reducing production energy consumption.

[0018] 2. In the present invention, a double-layer hollow structure is formed by setting an outer cylinder and an inner cylinder. The outer wall diameter of the inner cylinder is one-third of the outer cylinder, and the inner cylinder is composed of two semicircular cylinders. There is a flow pore in the middle of the semicircular cylinder. When the extraction work is carried out, when the extracted water inside the left extraction tank and the right extraction tank is discharged from the overflow pipe, it will directly enter the pores between the outer cylinder and the inner cylinder. The heat in the overflow water will heat the inner cylinder, and the new extraction water injected into the inner cylinder from the liquid inlet pipe will be heated. After that, after entering the left extraction tank and the right extraction tank from the liquid outlet, the water flow temperature can be increased to the required threshold without consuming too much energy, thereby reducing the working energy consumption of the heating device and achieving the effect of heat recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the three-dimensional distribution structure of the left extraction tank, the right extraction tank and the heat recovery component of the utility model;

[0021] Figure 3 This is a schematic diagram of the three-dimensional connection structure of the left extraction tank, the right extraction tank and the heat recovery component of the utility model;

[0022] Figure 4 It is a three-dimensional structure schematic view of the pump box, circulating water tank and conveying pipe of the utility model;

[0023] Figure 5 It is a three-dimensional structure schematic view of the lifting assembly of the utility model;

[0024] Figure 6 It is a three-dimensional structure schematic view of the heat recovery assembly of the utility model;

[0025] Figure 7 It is a cross-section structure schematic view of the heat recovery assembly of the utility model.

[0026] In the drawing: 1, ladder frame assembly; 2, lifting assembly; 3, pump box; 4, heat recovery assembly; 5, left extraction tank; 6, right extraction tank; 7, overflow pipe; 8, liquid inlet pipe; 9, discharging pipe; 10, circulating water tank; 11, conveying pipe; 101, bottom support; 102, first layer frame body; 103, second layer frame body; 104, third layer frame body; 105, guardrail; 106, staircase; 201, layered box body; 202, conveying frame; 203, winding machine; 204, protective door; 401, round base; 402, outer ring frame; 403, outer cylinder; 404, tightening ring; 405, inner cylinder; 406, liquid inlet; 407, water return port; 408, liquid outlet; 409, liquid discharge pipe; 501, tank body; 502, heating device; 503, stirring device; 504, feeding hopper; 505, electric valve. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0028] Embodiment: refer to Figure 1-Figure 7The low-melting-point copolyamide continuous extraction equipment shown comprises a ladder assembly 1, a lifting assembly 2 arranged at the back of the inside of the ladder assembly 1, two groups of the lifting assemblies 2 are symmetrically distributed, a pump box 3 is arranged at the middle of the top end of the ladder assembly 1, a heat recovery assembly 4 is arranged in front of the pump box 3, the pump box 3 and the heat recovery assembly 4 are both trapezoidal and are distributed in three groups, a left extraction tank 5 is arranged at the left side of the heat recovery assembly 4, a right extraction tank 6 is arranged at the right side of the heat recovery assembly 4, the left extraction tank 5 and the right extraction tank 6 are symmetrically distributed, and the pump box 3, the heat recovery assembly 4, the left extraction tank 5 and the right extraction tank 6 constitute an extraction heat recovery mechanism, and the extraction heat recovery mechanism is sequentially divided into a first-stage extraction heat recovery mechanism, a second-stage extraction heat recovery mechanism and a third-stage extraction heat recovery mechanism from top to bottom, the heat recovery assembly 4 is communicated with the left extraction tank 5 and the right extraction tank 6 through an overflow pipe 7, liquid inlet pipes 8 are arranged at the left and right sides of the upper end of the heat recovery assembly 4, a discharging pipe 9 is arranged at the lower end of the left extraction tank 5 and the right extraction tank 6, a circulating water tank 10 is arranged below the pump box 3, and the circulating water tank 10 is communicated with the pump box 3 through a conveying pipe 11.

[0029] The ladder assembly 1 comprises a bottom support 101, a first-layer frame body 102, a second-layer frame body 103, a third-layer frame body 104, a guardrail 105 and a staircase 106, the back side of the upper end of the bottom support 101 is provided with the first-layer frame body 102, the back side of the upper end of the first-layer frame body 102 is provided with the second-layer frame body 103, the land area of the first-layer frame body 102 is twice that of the second-layer frame body 103, the back side of the upper end of the second-layer frame body 103 is provided with the third-layer frame body 104, the land area of the second-layer frame body 103 is twice that of the third-layer frame body 104, the first-layer frame body 102, the second-layer frame body 103 and the third-layer frame body 104 are all vertically installed at the upper end of the bottom support 101 by the back side, the first-layer frame body 102, the second-layer frame body 103 and the third-layer frame body 104 constitute a trapezoidal structure, the outer sides of the upper ends of the first-layer frame body 102, the second-layer frame body 103 and the third-layer frame body 104 are all provided with the guardrail 105, and the left and right sides of the front ends of the first-layer frame body 102, the second-layer frame body 103 and the third-layer frame body 104 are provided with the staircase 106.

[0030] By setting the pump box 3, heat recovery component 4, left extraction tank 5 and right extraction tank 6, the four are interconnected through the overflow pipe 7 and the liquid inlet pipe 8 to form a complete set of extraction heat recovery mechanism. At the same time, in conjunction with the first-layer frame 102, the second-layer frame 103 and the third-layer frame 104 in the ladder frame component 1, a secondary extraction heat recovery mechanism and a tertiary extraction heat recovery mechanism are formed in a trapezoidal shape from top to bottom. The three groups of extraction heat recovery mechanisms exist independently of each other, ensuring that the temperature between the extraction mechanisms at each level can be accurately controlled during extraction, establishing a stable temperature gradient, and allowing the extraction water to achieve sufficient countercurrent contact with the copolyamide, thereby improving the extraction efficiency while reducing production energy consumption.

[0031] The layered box 201 is provided to form a connection between the first layer frame 102, the second layer frame 103 and the third layer frame 104. When the copolyamide raw materials need to be transported, the raw materials only need to be placed in the conveying frame 202 at the bottom, and then the winder 203 is turned on to wind up the slings connected to the left and right ends of the conveying frame 202. The conveying frame 202 can be lifted to the required height, and then the protective door 204 is lifted up to take out the raw materials inside the conveying frame 202, which reduces the difficulty of conveying raw materials and improves the convenience during production.

[0032] like Figure 6 and Figure 7 As shown, in this embodiment, the heat recovery component 4 includes a circular base 401, an outer ring frame 402, an outer cylinder 403, a tightening ring 404, an inner cylinder 405, a liquid inlet 406, a water return port 407, a liquid outlet 408 and a drain pipe 409. The upper end of the circular base 401 is provided with an outer ring frame 402, the inner side of the upper end of the outer ring frame 402 is provided with an outer cylinder 403, the upper end of the outer ring frame 402 is provided with a tightening ring 404, the inner part of the outer cylinder 403 is provided with an inner cylinder 405, and the inner cylinder 405 is composed of two semi-cylinders and a top cover. The outer cylinder 403 is a whole, and a gap is opened in the middle of the two semi-cylinders. A liquid inlet 406 is opened on the left and right sides of the upper end of the inner cylinder 405, and a return water port 407 is opened on both sides of the middle of the outer end of the outer cylinder 403. The outer cylinder 403 and the return water port 407 are connected to each other. A liquid outlet 408 is opened on both sides of the lower side of the outer end of the outer cylinder 403. The liquid outlet 408 is connected to the inner cylinder 405 through a pipeline, and the contact end of the liquid outlet 408 and the outer cylinder 403 is sealed. The lower end of the outer cylinder 403 is connected to a drain pipe 409.

[0033] By setting the outer cylinder 403 and the inner cylinder 405, a double-layer hollow structure is formed. The outer wall diameter of the inner cylinder 405 is one-third of the outer cylinder 403, and the inner cylinder 405 is composed of two semicircular cylinders. There is also a flow pore in the middle of the semicircular cylinder. During the extraction work, when the extracted water inside the left extraction tank 5 and the right extraction tank 6 is discharged from the overflow pipe 7, it will directly enter the pores between the outer cylinder 403 and the inner cylinder 405. The heat in the overflow water will heat the inner cylinder 405, and the new extracted water injected into the inner cylinder 405 from the liquid inlet pipe 8 will be heated. After that, after entering the left extraction tank 5 and the right extraction tank 6 from the liquid outlet 408, the water flow temperature can be increased to the required threshold without consuming too much energy, thereby reducing the working energy consumption of the heating device 502 and achieving energy saving.

[0034] like Figures 1 to 3 As shown, in this embodiment, the left extraction tank 5 includes a tank body 501, a heating device 502, a stirring device 503, a feed hopper 504 and an electric valve 505. The tank body 501 is provided with an interlayer, and an electric heating pipe is laid inside the interlayer. The electric heating pipe and the heating device 502 are electrically connected to each other. The left side of the outer end of the tank body 501 is provided with a heating device 502, and the middle part of the upper end of the tank body 501 is provided with a stirring device 503, wherein the heating device 502 and the stirring device 503 are both This is an existing known technology, so it will not be elaborated on in this article. A feed hopper 504 is provided on the front side of the upper end of the tank body 501, and the feed hopper 504 is connected to the outer wall of the upper end of the tank body 501, and a closing plate is provided at the opening position of the feed hopper 504 for sealing. An electric valve 505 is provided at the lower end of the tank body 501, and the upper end of the electric valve 505 is connected to the lower end of the tank body 501, and the lower end of the electric valve 505 is connected to the discharge pipe 9.

[0035] The working principle of the present invention is as follows: before the low-melting-point copolyamide continuous extraction equipment starts working, the raw materials are placed in the conveying frame 202, and then the winder 203 is turned on to wind up the slings connected to the left and right ends of the conveying frame 202, so that the conveying frame 202 can be lifted to the required height, and then the protective door 204 is lifted upward to take out the raw materials inside the conveying frame 202; then the raw materials are injected into the tank body 501 from the feed hopper 504, and the extraction work is started by countercurrent contact with the internal extraction water. When the extraction water inside the left extraction tank 5 and the right extraction tank 6 is discharged from the overflow pipe 7, it will directly enter the pores between the outer cylinder 403 and the inner cylinder 405, and the heat in the overflow water will heat the inner cylinder 405, and the new extraction water injected into the inner cylinder 405 from the liquid inlet pipe 8 will be heated, and then enter the left extraction tank 5 and the right extraction tank 5 from the liquid outlet 408. After entering the extraction tank 6, the water flow temperature can be increased to the required threshold value without consuming too much energy, thereby reducing the working energy consumption of the heating device 502 and realizing the heat recovery effect; secondly, through the set pump box 3, heat recovery component 4, left extraction tank 5 and right extraction tank 6, the four are interconnected through the overflow pipe 7 and the liquid inlet pipe 8 to form a complete set of extraction heat recovery mechanism. At the same time, in conjunction with the first-layer frame 102, the second-layer frame 103 and the third-layer frame 104 in the ladder frame assembly 1, a secondary extraction heat recovery mechanism and a tertiary extraction heat recovery mechanism are formed in a trapezoidal shape from top to bottom. The three groups of extraction heat recovery mechanisms exist independently of each other, ensuring that the temperature between the extraction mechanisms at each level can be accurately controlled during extraction, establishing a stable temperature gradient, and allowing the extraction water to achieve sufficient countercurrent contact with the copolyamide, thereby improving the extraction efficiency while reducing production energy consumption.

[0036] The electrical components mentioned in this article are all connected to an external main controller and 220V AC power, and the main controller can be a conventional known device that performs control such as a computer.

[0037] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A low melting point copolyamide continuous extraction apparatus comprising a ladder assembly (1), characterized in that: A lifting assembly (2) is provided at the rear of the inner side of the ladder frame assembly (1), a pump box (3) is provided at the middle of the top of the ladder frame assembly (1), a heat recovery assembly (4) is provided in front of the pump box (3), a left extraction tank (5) is provided on the left side of the heat recovery assembly (4), a right extraction tank (6) is provided on the right side of the heat recovery assembly (4), an overflow pipe (7) is connected between the heat recovery assembly (4) and the left extraction tank (5) and the right extraction tank (6), a liquid inlet pipe (8) is provided on the left and right sides of the upper end of the heat recovery assembly (4), a discharge pipe (9) is provided at the lower ends of the left extraction tank (5) and the right extraction tank (6), a circulating water tank (10) is provided below the pump box (3), and a delivery pipe (11) is connected between the circulating water tank (10) and the pump box (3).

2. The low-melting-point copolyamide continuous extraction equipment according to claim 1, characterized in that: The ladder frame assembly (1) comprises a bottom bracket (101), a first-layer frame (102), a second-layer frame (103), a third-layer frame (104), a guardrail (105) and a staircase (106), wherein a first-layer frame (102) is provided at the rear side of the upper end of the bottom bracket (101), a second-layer frame (103) is provided at the rear side of the upper end of the first-layer frame (102), a third-layer frame (104) is provided at the rear side of the upper end of the second-layer frame (103), and guardrails (105) are provided on the outer sides of the upper ends of the first-layer frame (102), the second-layer frame (103) and the third-layer frame (104), and staircases (106) are provided on the left and right sides of the front ends of the first-layer frame (102), the second-layer frame (103) and the third-layer frame (104).

3. The low-melting-point copolyamide continuous extraction equipment according to claim 1, characterized in that: The lifting assembly (2) comprises a layered box (201), a conveying frame (202), a winder (203) and a protective door (204); the conveying frame (202) is provided inside the layered box (201); the winder (203) is provided in the middle of the top end of the layered box (201); and the protective door (204) is slidably mounted on the inner side of the front end of the layered box (201).

4. The low-melting-point copolyamide continuous extraction equipment according to claim 1, characterized in that: The heat recovery assembly (4) comprises a circular base (401), an outer ring frame (402), an outer cylinder (403), a tightening ring (404), an inner cylinder (405), a liquid inlet (406), a water return port (407), a liquid outlet (408) and a liquid discharge pipe (409). The upper end of the circular base (401) is provided with an outer ring frame (402), the inner side of the upper end of the outer ring frame (402) is provided with an outer cylinder (403), and the outer ring frame A tightening ring (404) is provided at the upper end of (402), an inner cylinder (405) is provided inside the outer cylinder (403), a liquid inlet (406) is provided on the left and right sides of the upper end of the inner cylinder (405), a water return port (407) is provided on both sides of the middle of the outer end of the outer cylinder (403), a liquid outlet (408) is provided on both sides of the lower part of the outer end of the outer cylinder (403), and a liquid discharge pipe (409) is provided at the lower end of the outer cylinder (403).

5. The low-melting-point copolyamide continuous extraction equipment according to claim 1, characterized in that: The left extraction tank (5) comprises a tank body (501), a heating device (502), a stirring device (503), a feed hopper (504) and an electric valve (505). The left side of the outer end of the tank body (501) is provided with a heating device (502), the middle part of the upper end of the tank body (501) is provided with a stirring device (503), the front side of the upper end of the tank body (501) is provided with a feed hopper (504), and the lower end of the tank body (501) is provided with an electric valve (505).

6. The low-melting-point copolyamide continuous extraction equipment according to claim 1, characterized in that: The lifting components (2) are symmetrically distributed in two groups on the left and right sides, the pump box (3) and the heat recovery component (4) are both trapezoidally distributed in three groups, the left extraction tank (5) and the right extraction tank (6) are symmetrically distributed, and the pump box (3), the heat recovery component (4), the left extraction tank (5) and the right extraction tank (6) constitute a set of extraction heat recovery mechanism, and the extraction heat recovery mechanism is divided into a first-level extraction heat recovery mechanism, a second-level extraction heat recovery mechanism and a third-level extraction heat recovery mechanism from top to bottom.

7. The low-melting-point copolyamide continuous extraction equipment according to claim 2, characterized in that: The floor area of ​​the first-layer frame (102) is twice that of the second-layer frame (103), and the floor area of ​​the second-layer frame (103) is twice that of the third-layer frame (104). The first-layer frame (102), the second-layer frame (103) and the third-layer frame (104) are all vertically mounted on the upper end of the bottom bracket (101) at the rear side. The first-layer frame (102), the second-layer frame (103) and the third-layer frame (104) form a trapezoidal structure.

8. The low-melting-point copolyamide continuous extraction equipment according to claim 4, characterized in that: The inner cylinder (405) is formed into a whole by two semi-cylinders and a top cover, and a gap is opened in the middle of the two semi-cylinders. The outer cylinder (403) and the return water port (407) are connected to each other, and the liquid outlet (408) and the inner cylinder (405) are connected through a pipeline, and the contact end of the liquid outlet (408) and the outer cylinder (403) is sealed.

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