A cross-drawing machine oven heat energy recovery device

Abstract

The utility model relates to heat energy recovery device technical field and disclose a kind of horizontal pull machine oven heat energy recovery device, including installation box, the front and rear surface of installation box is all fixedly connected with support frame, uniform mixing subassembly, uniform mixing subassembly is set on installation box, and uniform mixing subassembly includes first baffle, first baffle is fixedly connected on the middle position inside installation box, the left side of first baffle is fixedly connected with two second baffle, and the left side in installation box is divided into three independent spaces by two second baffle, by setting uniform mixing subassembly, curved pipe and arc-shaped agitator solve preliminary mixing uniform problem, staggered inclined plate and rotating arc-shaped plate solve depth mixing uniform problem, multi-link collaboration ensures that temperature distribution in oven is stable, avoid local temperature fluctuation to cause PI film tensile quality problem (such as film surface shrinkage, uneven stretching), finally realize the dual goal of heat energy recovery and oven temperature uniformity.

Description

Technical Field

[0001] This utility model relates to the technical field of heat energy recovery devices, specifically a heat energy recovery device for a horizontal stretching machine oven. Background Technology

[0002] An improved heat recovery device for a horizontal stretching machine, disclosed in CN217802785U, includes an oven and a heat exchanger. The heat exchanger has a cold fluid inlet, a cold fluid outlet, a hot fluid inlet, and a hot fluid outlet. Parallel heat exchange tubes are arranged in an array inside the heat exchanger. One end of each heat exchange tube is connected to the hot fluid inlet, and the other end is connected to the hot fluid outlet. Spiral heat exchange plates are arranged along the length of each heat exchange tube on its outer wall. The cold fluid inlet of the heat exchanger is connected to a fresh air system via a pipe. The cold fluid outlet of the heat exchanger is connected to the bottom of the oven via a first fan. The hot fluid inlet of the heat exchanger is connected to the top of the oven via a second fan. The hot fluid outlet of the heat exchanger is connected to a condenser via a pipe. This invention uses a condenser instead of a spray tower to recover organic solvents and improves the internal structure of the heat exchanger to increase heat exchange efficiency.

[0003] However, the aforementioned improved heat recovery device for a horizontal stretching machine mentions that "multiple air inlets are set at the bottom of the oven, and multiple first fans are connected to the cold fluid outlet of the heat exchanger," but it does not solve the problem of airflow matching: the multiple fans lack a "synchronous adjustment" structure, and the uniformity of air intake cannot be guaranteed by the "air inlet spacing" alone. Multiple first fans correspond to different air inlets, but no "air volume regulating valve" or "synchronous control module" is designed: if there are slight differences in the fan models (or inconsistent fan performance degradation after long-term use), it will lead to differences in the fresh air volume of different air inlets, which will result in uneven air intake temperature / air volume in different areas at the bottom of the oven; the temperature distribution fluctuation inside the oven will directly affect the stretching quality of the PI film (such as local overheating causing film shrinkage, and local insufficient temperature causing uneven stretching), which contradicts the design goal of "maintaining uniform temperature inside the oven". Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a heat recovery device for a horizontal stretching machine oven. This solves the problem of an improved horizontal stretching machine heat recovery device that mentions "multiple air inlets at the bottom of the oven, connected to the cold fluid outlet of the heat exchanger via multiple first fans," but fails to address the issue of airflow matching: the multiple fans lack a "synchronous adjustment" structure, and the uniformity of air intake cannot be guaranteed solely by the "air inlet spacing," which cannot ensure that multiple first fans correspond to different air inlets. Furthermore, no "airflow regulating valve" or "synchronous control module" is designed. If there are slight differences in fan models (or inconsistent fan performance degradation after long-term use), it will lead to differences in the fresh air volume at different air inlets, resulting in uneven airflow / temperature distribution in different areas at the bottom of the oven. Fluctuations in temperature distribution within the oven directly affect the stretching quality of the PI film (e.g., localized overheating leading to film shrinkage, or localized insufficient temperature leading to uneven stretching), contradicting the design goal of "maintaining uniform temperature inside the oven."

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a heat recovery device for a horizontal stretching machine oven, comprising an installation box, with support frames fixedly connected to both the front and rear surfaces of the installation box, a uniform mixing component, the uniform mixing component being disposed on the installation box, the uniform mixing component including a first partition plate, the first partition plate being fixedly connected to the middle position inside the installation box;

[0008] Among them, two second partitions are fixedly connected to the left side of the first partition, and the two second partitions divide the left side of the installation box into three independent spaces. Multiple curved tubes are fixedly connected to the lower left side of the first partition.

[0009] Among them, the right side of multiple curved tubes extends through the right side of the first partition, and three second connecting boxes are fixedly connected to the left side of the lower surface of the mounting box, with the upper ends of the three second connecting boxes extending into the interior of the mounting box.

[0010] Among them, the ends of multiple curved tubes away from the first partition are respectively fixedly connected to the corresponding second connecting boxes, and the multiple curved tubes are respectively connected to the corresponding second connecting boxes.

[0011] Preferably, a servo motor is fixedly mounted on the front surface of the mounting box, and a connecting shaft is fixedly connected to the output end of the servo motor. The rear end of the connecting shaft rotatably penetrates into the interior of the mounting box and is rotatably connected to the inner wall of the mounting box.

[0012] The connecting shaft is located on the right side of the first partition plate. Multiple sets of arc-shaped stirring plates are fixedly connected to the outer wall of the connecting shaft. Each set of arc-shaped stirring plates consists of four arc-shaped stirring plates arranged in a cross shape.

[0013] The upper right side of the mounting box is fixedly connected to an air supply box that communicates with its interior, and the rear surface of the air supply box is fixedly connected to an air supply pipe that communicates with its interior.

[0014] Preferably, a first connecting box is fixedly connected to the left side of the upper surface of the mounting box, and the end of the gas supply pipe away from the gas supply box is fixedly connected to the first connecting box, and the gas supply pipe communicates with the first connecting box;

[0015] Two heating fans are fixedly installed on the upper surface of the first connecting box, and connecting pipes are fixedly installed at the air outlets of the two heating fans.

[0016] Preferably, the interior of the first connecting box is provided with four inclined plates. From back to front, the first and third inclined plates are fixedly connected to the top of the first connecting box and are both inclined forward.

[0017] Among them, the second and fourth inclined plates from back to front are both fixedly connected to the bottom of the first connecting box, and both are inclined backward.

[0018] Preferably, four mounting tubes are fixedly connected to the left side of the first connecting box, and rotating tubes communicating with the inside of each of the four mounting tubes are rotatably connected to the right side of each of the four mounting tubes. The right ends of the four rotating tubes are rotatably inserted into the interior of the first connecting box and are rotatably connected to the inner wall of the first connecting box.

[0019] Preferably, the outer walls of the four rotating tubes are fixedly connected with two sets of arc-shaped plates that communicate with their interiors. Each set of arc-shaped plates consists of four arc-shaped plates arranged in a cross shape, and exhaust holes are provided on each of the multiple arc-shaped plates.

[0020] The four rotating tubes are located on opposite sides of multiple inclined plates.

[0021] Preferably, the lower surfaces of both connecting pipes are fixedly connected to concave connecting pipes that communicate with their interiors, and the right sides of the two concave connecting pipes are respectively fixedly connected to corresponding mounting pipes.

[0022] Preferably, the lower surfaces of the three connecting boxes are all fixedly connected with air inlets that communicate with their interiors;

[0023] The front surface of the connecting box is fixedly connected to an air outlet duct that communicates with its interior.

[0024] Preferably, the arc-shaped stirring plate can be replaced with a straight stirring plate with a scraper and a guide groove. The straight stirring plate is rectangular, with a silicone scraper added to the edge of the plate and a guide groove opened on the surface.

[0025] Preferably, the arc-shaped stirring plate can be replaced with a straight stirring plate with heat dissipation holes. The plate has multiple heat dissipation holes, retains a fixed connection with the connecting shaft, and the hole positions avoid the stress area of ​​the plate.

[0026] (III) Beneficial Effects

[0027] Compared with the prior art, this utility model provides a heat recovery device for a horizontal stretching machine oven, which has the following beneficial effects:

[0028] By setting up a uniform mixing component, the curved tube and arc-shaped stirring plate solve the problem of initial uniform mixing, while the staggered inclined plate and rotating arc plate solve the problem of deep uniform mixing. The multi-stage collaboration ensures a stable temperature distribution inside the oven, avoiding PI film stretching quality problems (such as film shrinkage and uneven stretching) caused by local temperature fluctuations, and ultimately achieving the dual goals of heat recovery and uniform oven temperature. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the heat recovery device for the horizontal stretching machine oven of this utility model;

[0030] Figure 2 This is a schematic diagram of the gas transmission pipe of this utility model;

[0031] Figure 3 This is a schematic diagram of the curved tube of this utility model;

[0032] Figure 4 This is a schematic diagram of the inclined plate of this utility model;

[0033] Figure 5 This is a schematic diagram of the replaceable arc-shaped stirring plate of this utility model;

[0034] Figure 6 This is a schematic diagram of the replaceable arc-shaped stirring plate of this utility model.

[0035] In the diagram: 1. Mounting box; 2. Air inlet; 3. Air outlet pipe; 4. Servo motor; 5. Air supply box; 6. First connecting box; 7. Heating fan; 8. Connecting pipe; 9. Mounting pipe; 10. Concave connecting pipe; 11. Air supply pipe; 12. Second connecting box; 13. Curved pipe; 14. First partition; 15. Arc-shaped stirring plate; 16. Connecting shaft; 17. Rotating pipe; 18. Arc-shaped plate; 19. Inclined plate; 20. Second partition. Detailed Implementation

[0036] 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.

[0037] Please see Figure 1-6This utility model provides a new technical solution: a heat recovery device for a horizontal stretcher oven, including multiple curved tubes 13, the left ends of which are fixedly connected (and communicate) with the corresponding second connecting boxes 12, and the right ends of which all extend through the right side of the first partition 14. The bent structure extends the flow path of fresh air in the installation box 1, so that the fresh air can initially absorb the heat energy recovered in the installation box 1 to achieve preheating; the multiple curved tubes 13 are evenly distributed to ensure that the fresh air is evenly dispersed to the right side space of the installation box 1.

[0038] There are three second connecting boxes 12, which are fixedly connected to the left side of the lower surface of the mounting box 1. The upper end penetrates into the interior of the mounting box 1, and the lower end is fixedly connected to the air inlet 2. They are connected to the curved pipe 13 and the air inlet 2, and receive the fresh air delivered by the air inlet 2 and divert it to the corresponding curved pipe 13.

[0039] There are three air inlets 2, which are fixedly connected to the lower surface of the three second connecting boxes 12 and communicate with the inside of the second connecting boxes 12. They are used to receive warm fresh air discharged from the cold fluid outlet of the heat exchanger. With the help of the synchronous control module (which adjusts the speed of the corresponding air supply fan), the fresh air volume of the three air inlets 2 is consistent.

[0040] The servo motor 4 is fixedly mounted on the front surface of the mounting box 1, and its output end is fixedly connected to the connecting shaft 16, providing power for the rotation of the connecting shaft 16 and the arc-shaped stirring plate 15, thereby driving the forced mixing of hot and cold air.

[0041] The rear end of the connecting shaft 16 rotates through the interior of the mounting box 1 and rotates to connect with the inner wall of the box. It is located on the right side of the first partition 14. Multiple sets of arc-shaped stirring plates 15 are fixedly connected to the outer wall, which transmits power to the servo motor 4 and drives the arc-shaped stirring plates 15 to rotate synchronously.

[0042] The arc-shaped stirring plates 15 are in multiple groups, each group consisting of four arc-shaped stirring plates arranged in a cross shape. They are fixedly connected to the outer wall of the connecting shaft 16, and their rotation direction is opposite to the fresh air flow direction. They cover the entire right side space of the installation box 1, breaking the airflow stratification, forcing the fresh air and the recovered hot air to fully mix, and eliminating local temperature differences.

[0043] The air supply box 5 is fixedly connected to the right side of the upper surface of the mounting box 1 and communicates with the inside of the mounting box 1. It collects the hot air that is uniformly mixed on the right side of the mounting box 1 and provides a transition channel for the hot air to be delivered to the first connecting box 6.

[0044] One end of the gas supply pipe 11 is fixedly connected (and communicates) to the rear surface of the gas supply box 5, and the other end is fixedly connected (and communicates) to the first connecting box 6, so as to transport the hot air collected in the gas supply box 5 to the first connecting box 6.

[0045] The first connecting box 6 is fixedly connected to the left side of the upper surface of the mounting box 1. It is equipped with four inclined plates 19 and four rotating pipes 17 inside. Four mounting pipes 9 are fixedly connected to the left side. Two heating fans 7 are fixedly installed on the upper surface for deep mixing of hot air and fusion of supplementary hot air.

[0046] There are four inclined plates 19, which are arranged in a staggered flow pattern inside the first connecting box 6. The first and third inclined plates 19 from back to front are fixedly connected to the top of the first connecting box 6 and tilted forward, while the second and fourth inclined plates 19 are fixedly connected to the bottom of the first connecting box 6 and tilted backward. This guides the hot air to flow along the flow path, disrupts the airflow distribution to compensate for small temperature differences, and prolongs the residence time of the hot air in the first connecting box 6.

[0047] There are two heating fans 7, which are fixedly installed on the upper surface of the first connecting box 6. The air outlet is fixedly connected to the connecting pipe 8 to generate supplementary hot air, which is used to regulate the temperature of the mixed air and meet the heat requirements of the oven.

[0048] There are two connecting pipes 8. One end is fixedly connected to the air outlet of the heating fan 7, and the other end is fixedly connected to the concave connecting pipe 10 on its lower surface, so that the supplementary hot air generated by the heating fan 7 can be delivered to the concave connecting pipe 10.

[0049] There are two concave connecting pipes 10, which are fixedly connected to the corresponding mounting pipes 9 on the right side respectively. They are connected to both the connecting pipe 8 and the mounting pipes 9, and the supplementary hot air delivered by the connecting pipe 8 is diverted to the four mounting pipes 9.

[0050] There are four mounting pipes 9, which are fixedly connected to the left side of the first connecting box 6. The right end is rotatably connected to the rotating pipe 17 and communicates with the inside of the rotating pipe 17, so that the supplementary hot air delivered by the concave connecting pipe 10 is introduced into the rotating pipe 17.

[0051] There are four rotating tubes 17. The right end rotates through the first connecting box 6 and rotates to connect with the inner wall of the box. The left end rotates to connect with the mounting tube 9 (and communicates with it). Two sets of arc-shaped plates 18 are fixedly connected to the outer wall. They rotate under the drive of the supplementary hot air flow to make the hot air spray evenly.

[0052] The arc-shaped plates 18 are in multiple groups, each group consisting of four arc-shaped plates arranged in a cross shape, fixedly connected to the outer wall of the rotating tube 17 and communicating with the inside of the rotating tube 17. The plates are provided with exhaust holes. As the rotating tube 17 rotates, the supplementary hot air is evenly sprayed into the deflected hot air in the first connecting box 6 through the exhaust holes, so as to achieve all-round contact between the supplementary hot air and the recovered hot air.

[0053] Furthermore, when using the heat recovery device of the horizontal stretcher oven, fresh air with a certain temperature enters the three air inlets 2 from the cold fluid outlet of the heat exchanger.

[0054] Fresh air with a certain temperature enters three air inlets 2 from the cold fluid outlet of the heat exchanger, then enters three second connecting boxes 12, and is then transported to the interior of the installation box 1 (to the right of the first partition 14) through multiple curved pipes 13. The bending structure of the curved pipes 13 extends the flow path of the fresh air in the installation box 1, allowing the fresh air to initially absorb the recovered heat energy in the installation box 1 during the transportation process, thus achieving preheating. At the same time, the multiple curved pipes 13 are evenly distributed on the left side of the first partition 14, further ensuring that the fresh air can be evenly distributed to the right side space of the installation box 1, avoiding uneven temperature caused by local concentration of fresh air.

[0055] The servo motor 4 is started, and its output drives the connecting shaft 16 to rotate. The connecting shaft 16 drives the multiple sets of arc-shaped stirring plates 15 (arranged in a cross) on the outer wall to rotate synchronously. The rotation direction of the arc-shaped stirring plates 15 is opposite to the direction of fresh air flow. This allows for forced mixing of the fresh air entering the right side of the installation box 1 with the recovered hot air inside the box. The cross-shaped arc-shaped stirring plates 15 can cover the entire right side of the installation box 1, breaking the airflow stratification and allowing the hot and cold air to fully blend. This eliminates the problem of "local overheating / insufficient temperature" and lays a uniform temperature foundation for the air subsequently delivered to the oven, meeting the design goal of "maintaining a uniform temperature inside the oven".

[0056] The uniformly mixed hot air is collected by the air supply box 5 on the upper surface of the mounting box 1, and then transported to the first connecting box 6 through the air supply pipe 11. The four inclined plates 19 inside the first connecting box 6 are designed with "staggered flow deflection" (from back to front: plates 1 and 3 are connected to the top and tilted forward, plates 2 and 4 are connected to the bottom and tilted backward). After the hot air enters the first connecting box 6, it will flow along the deflection path of the inclined plates 19, rather than passing through directly in a straight line. During the deflection process, the hot air will collide and split with the surface of the inclined plates 19, further disrupting the airflow distribution, making up for possible small temperature differences, and at the same time extending the residence time of the hot air in the first connecting box 6, so as to reserve sufficient time for subsequent mixing with the hot air of the heating fan 7.

[0057] In this process, two heating fans 7 are started, and the supplementary hot air generated by the heating fans 7 is delivered to the concave connecting pipe 10 through the connecting pipe 8, and then distributed to four installation pipes 9 through the concave connecting pipe 10. The hot air enters the rotating pipe 17 through the installation pipe 9. At this time, the rotating pipe 17 will rotate under the drive of the airflow. The arc plate 18 (with exhaust hole) on the outer wall of the rotating pipe 17 rotates with it, and the hot air is evenly sprayed into the deflected hot air in the first connecting box 6 through the exhaust hole. The arc plate 18 is arranged in a cross shape and has a wide rotation coverage, which allows the supplementary hot air to come into full contact with the deflected recovered hot air, avoiding local accumulation of supplementary hot air and further improving the temperature and airflow uniformity of the mixed air.

[0058] The hot air that is finally mixed evenly is delivered to the oven of the horizontal stretching machine through the air outlet of the first connecting box 6 to provide a stable temperature environment for PI film stretching.

[0059] Among them, by setting up a uniform mixing component and a synchronous control module to solve the problem of airflow matching, the curved tube 13 and the arc-shaped stirring plate 15 solve the problem of initial uniform mixing, and the staggered inclined plate 19 and the rotating arc plate 18 solve the problem of deep uniform mixing. The multi-stage collaboration ensures stable temperature distribution in the oven and avoids PI film stretching quality problems (such as film shrinkage and uneven stretching) caused by local temperature fluctuations. Ultimately, it achieves the dual goals of heat recovery and uniform oven temperature.

[0060] Example 1: Application in high-viscosity impurity environments after replacing a straight-plate agitator with scraper strips and flow channels. Figure 5 As shown

[0061] Scene background

[0062] In the production process of a PI film factory, the hot air discharged from the oven contains oligomeric viscous impurities (viscosity 100-150 cP). The original curved stirring plate 15 is prone to fouling due to its curved surface structure (approximately 3g of fouling per day), resulting in a reduction in the stirring gap (from 20mm to 12mm). This increases the airflow resistance on the right side of the mounting box 1 by 30%. After the impurities harden, they need to be cleaned with a scraper (which easily scratches the curved surface, resulting in a 5% deformation rate of the plate after 3 months). This leads to a decrease in mixing efficiency, causing a temperature deviation of ±4℃ and an 8% uneven stretching rate of the PI film. At this point, the curved stirring plate 15 is replaced with a "straight stirring plate with a scraper strip and a guide groove". The plate is rectangular (150mm long and 20mm wide), retaining the cross-shaped fixing structure with the connecting shaft 16. A silicone scraper strip is added to the edge of the plate (with a 0.1mm gap from the inner wall of the mounting box 1), and a 1mm deep guide groove is opened on the surface (along the length direction).

[0063] Structural function and practical effect

[0064] High viscosity impurities, anti-fouling, and compatibility with various materials:

[0065] The straight plate structure eliminates curved dead corners, reducing the impurity accumulation rate from 3g / day to 0.5g / day; the scraper bar rotates with the plate (30r / min) to scrape away residual impurities on the tank wall and plate in real time, restoring airflow resistance to its initial value, and reducing the temperature deviation on the right side of the installation box 1 from ±4℃ to ±0.6℃; the guide channel guides impurities to the bottom slag discharge port (newly added), extending the cleaning cycle from once a day to once a week, and reducing maintenance time by 85%;

[0066] Compatible with existing structure:

[0067] The mounting holes and rotation radius of the straight mixing plate are the same as those of the original curved plate, and it can be directly fixed on the connecting shaft 16. The weight of the plate (200g) is close to that of the curved plate, the load current of the servo motor 4 remains unchanged (originally 1.2A), the torque transmission of the connecting shaft 16 is stable, and it does not affect the fresh air delivery path of the curved tube 13.

[0068] Example 2: Application of low-temperature frequent reheating (-15℃ environment) after replacing the straight plate stirring plate with heat dissipation holes

[0069] like Figure 6 As shown

[0070] Scene background

[0071] A PI film factory in Northeast China needs to turn on the heating fan 7 every 30 minutes for supplemental heating during winter (-15℃ to -5℃) (48 times a day). The original arc-shaped stirring plate 15 could not quickly disperse the supplemental heating air, resulting in a "local overheating zone" on the right side of the installation box 1 (the temperature rises sharply by 4℃ during supplemental heating). The sudden temperature change is transmitted to the oven through the air supply pipe 11, causing thermal stress when the PI film is stretched (crack rate 2.5%), requiring a reduction in the supplemental heating frequency (affecting the temperature stability of the oven). At this time, the arc-shaped stirring plate 15 is replaced with a "straight plate stirring plate with heat dissipation holes". The plate has multiple φ4mm heat dissipation holes (evenly distributed along the length direction), and the fixed connection with the connecting shaft 16 is retained. The hole positions avoid the stress area of ​​the plate (to ensure strength).

[0072] Structural function and practical effect

[0073] Improved uniformity of low-temperature heat replenishment:

[0074] The heat dissipation holes can disperse the supplementary heating air into multiple fine airflows, reducing the mixing time with the recovered air from 20 seconds to 5 seconds, eliminating local overheating areas, and reducing the temperature fluctuation on the right side of the installation box 1 from ±4℃ to ±0.7℃; the oven temperature is stable, the thermal stress crack rate of the PI film drops from 2.5% to below 0.3%, and the normal supplementary heating frequency can be restored.

[0075] Heat replenishment efficiency and energy consumption optimization:

[0076] After the mixing efficiency was improved, the single reheating time of the heating fan 7 was shortened from 15 minutes to 8 minutes, the daily reheating energy consumption was reduced from 50kWh to 28kWh, and the winter operating cost was reduced by 44%; the heat dissipation holes do not affect the plate strength (the bending strength is still ≥200MPa), and the service life of the mixing plate is not reduced.

[0077] Compatible with existing structure:

[0078] The perforated straight plate weighs 5% less (190g) than the curved plate, and the load on the servo motor 4 is slightly reduced (current drops from 1.2A to 1.1A); the rotational balance of the connecting shaft 16 is unaffected, and it is compatible with the fresh air delivery of the original curved tube 13 and the airflow collection function of the air box 5.

[0079] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heat recovery device for a horizontal stretching machine oven, comprising a mounting box (1), characterized in that: The front and rear surfaces of the mounting box (1) are fixedly connected with support frames and uniform mixing components. The uniform mixing components are set on the mounting box (1). The uniform mixing components include a first partition (14), which is fixedly connected to the middle position inside the mounting box (1). Among them, two second partitions (20) are fixedly connected to the left side of the first partition (14). The two second partitions (20) divide the left side of the installation box (1) into three independent spaces. Multiple curved tubes (13) are fixedly connected to the lower left side of the first partition (14). Among them, the right side of multiple curved tubes (13) extends through the right side of the first partition (14), and three second connecting boxes (12) are fixedly connected to the left side of the lower surface of the mounting box (1). The upper ends of the three second connecting boxes (12) extend into the interior of the mounting box (1). Among them, the ends of multiple curved tubes (13) away from the first partition (14) are respectively fixedly connected to the corresponding second connecting box (12), and the multiple curved tubes (13) are respectively connected to the corresponding second connecting box (12).

2. The heat recovery device for a horizontal stretching machine oven according to claim 1, characterized in that: A servo motor (4) is fixedly mounted on the front surface of the mounting box (1). A connecting shaft (16) is fixedly connected to the output end of the servo motor (4). The rear end of the connecting shaft (16) rotates through into the interior of the mounting box (1) and rotates to connect with the inner wall of the mounting box (1). Among them, the connecting shaft (16) is located on the right side of the first partition (14), and multiple sets of arc-shaped stirring plates (15) are fixedly connected to the outer wall of the connecting shaft (16). Each set of arc-shaped stirring plates (15) consists of four arc-shaped stirring plates (15) arranged in a cross shape. Among them, the right side of the upper surface of the mounting box (1) is fixedly connected to the gas supply box (5) which communicates with its interior, and the rear surface of the gas supply box (5) is fixedly connected to the gas supply pipe (11) which communicates with its interior.

3. The heat recovery device for a horizontal stretching machine oven according to claim 1, characterized in that: The first connecting box (6) is fixedly connected to the left side of the upper surface of the mounting box (1). The end of the gas supply pipe (11) away from the gas supply box (5) is fixedly connected to the first connecting box (6). The gas supply pipe (11) is connected to the first connecting box (6). Two heating fans (7) are fixedly installed on the upper surface of the first connecting box (6), and connecting pipes (8) are fixedly installed at the air outlets of the two heating fans (7).

4. The heat recovery device for a horizontal stretching machine oven according to claim 3, characterized in that: The first connecting box (6) is provided with four inclined plates (19). From back to front, the first inclined plate (19) and the third inclined plate (19) are fixedly connected to the top of the first connecting box (6) and are both inclined forward. Among them, the second inclined plate (19) and the fourth inclined plate (19) from back to front are both fixedly connected to the bottom of the first connecting box (6), and both are inclined backward.

5. The heat recovery device for a horizontal stretching machine oven according to claim 3, characterized in that: Four mounting tubes (9) are fixedly connected to the left side of the first connecting box (6). The right side of each of the four mounting tubes (9) is rotatably connected to a rotating tube (17) that communicates with its interior. The right ends of the four rotating tubes (17) are rotatably inserted into the interior of the first connecting box (6) and are rotatably connected to the inner wall of the first connecting box (6).

6. The heat recovery device for a horizontal stretching machine oven according to claim 5, characterized in that: The outer walls of the four rotating tubes (17) are fixedly connected with two sets of arc plates (18) that communicate with their interiors. Each set of arc plates (18) consists of four arc plates (18) arranged in a cross shape. Each set of arc plates (18) has an exhaust hole. Among them, four rotating tubes (17) are located on opposite sides of multiple inclined plates (19).

7. The heat recovery device for a horizontal stretching machine oven according to claim 3, characterized in that: The lower surfaces of the two connecting pipes (8) are fixedly connected to concave connecting pipes (10) that communicate with their interiors, and the right sides of the two concave connecting pipes (10) are fixedly connected to the corresponding mounting pipes (9).

8. The heat recovery device for a horizontal stretching machine oven according to claim 1, characterized in that: The lower surfaces of the three second connecting boxes (12) are all fixedly connected with air inlets (2) that communicate with their interiors; Among them, the front surface of the first connecting box (6) is fixedly connected to an air outlet pipe (3) that communicates with its interior.

9. A heat recovery device for a horizontal stretching machine oven according to claim 2, characterized in that: The arc-shaped stirring plate (15) can be replaced with a straight stirring plate with a scraper strip and a guide groove. The straight stirring plate is rectangular, with a silicone scraper strip installed on the edge of the plate and a guide groove on the surface.

10. A heat recovery device for a horizontal drawing machine oven according to claim 2, characterized in that: The arc-shaped stirring plate (15) can be replaced with a straight stirring plate with heat dissipation holes. The plate has multiple heat dissipation holes and retains a fixed connection with the connecting shaft (16). The holes are positioned to avoid the stress area of ​​the plate.

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