Ethylene glycol tank car unloading device

Abstract

The utility model relates to an ethylene glycol tank car unloading device which comprises a sampling table and a material conveying assembly, the sampling table comprises a table body, stairs and a supporting piece, the supporting piece is arranged on the table body in the mode that the height of the supporting piece is adjustable relative to the table body, and the supporting piece can abut against the ground when the device is in a sampling state; the material conveying assembly comprises a first conveying pipeline, a second conveying pipeline, an intermediate tank and an unloading pump, the intermediate tank is provided with an inlet, a first outlet and a second outlet, the first outlet is used for being communicated with the atmosphere or a recycling tank, and the two opposite ends of the first conveying pipeline are used for being communicated with a tank car and the inlet of the intermediate tank correspondingly. The second conveying pipeline is communicated with a second outlet of the intermediate tank and the ethylene glycol storage tank, and the unloading pump is arranged on the second conveying pipeline. According to the ethylene glycol tank car unloading device, the sampling table can be moved to the tank car, sampling is fast, and pump starting and stopping during secondary unloading are avoided; the intermediate tank is arranged, cavitation is reduced, and materials are recycled; the labor cost is reduced, the efficiency is improved, and the operation safety is high.

Description

Technical Field

[0001] This utility model relates to an ethylene glycol tanker unloading device. Background Technology

[0002] The main raw materials for the polyester fiber plant are purified terephthalic acid and ethylene glycol. The plant has a capacity of 1500 t / d and requires approximately 501 t / d of ethylene glycol. Transportation is done by truck daily (33.4 t per truck), requiring approximately 15 truckloads. The current unloading problem is:

[0003] 1. There are two manholes on the top of the tanker truck for sampling. When sampling, it is necessary to climb to the top of the tanker truck, which poses a safety hazard for outdoor operations, especially in rainy weather. Climbing is also time-consuming and laborious, with sampling time taking about 60 minutes. 2. Unloading the vehicle takes about 60 minutes. The vehicle may not be completely unloaded. In addition, multiple venting operations are required to prevent cavitation, and the pump starts and stops take about 40 minutes. 3. Two sampling operations are required during the unloading process, taking about 60 minutes each time. 4. Ethylene glycol is discharged during sampling, and the recovery device needs to be used for 40 minutes every day. 5. Sampling monitoring and unloading monitoring require 3 people and are time-consuming. 6. Unloading can only be done during the day shift. Unloading operations at night pose a safety hazard. Utility Model Content

[0004] The purpose of this invention is to provide an ethylene glycol tanker unloading device.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An ethylene glycol tanker unloading device includes a sampling platform and a conveying assembly. The sampling platform includes a platform body, a staircase, and a support member. The bottom of the platform body is provided with casters. The support member is adjustable in height relative to the platform body and is mounted on the platform body. The support member is able to rest against the ground when the device is in the sampling state.

[0007] The material conveying assembly includes a first conveying pipeline, a second conveying pipeline, an intermediate tank, and an unloading pump. The intermediate tank has an inlet, a first outlet, and a second outlet. The first outlet is positioned higher than the inlet, and the inlet is positioned higher than the second outlet. The first outlet is used to connect to the atmosphere or a recovery tank. The opposite ends of the first conveying pipeline are respectively used to connect to the tank truck and the inlet of the intermediate tank. The opposite ends of the second conveying pipeline are respectively connected to the second outlet of the intermediate tank and the ethylene glycol storage tank. The unloading pump is installed on the second conveying pipeline.

[0008] According to some embodiments of this utility model, the support member includes a support rod and a support plate. The support rod extends vertically and is located at the lower part of the platform body. The upper end of the support rod is rotatably connected to the platform body, and the support plate is disposed at the lower end of the support rod.

[0009] According to some embodiments of this utility model, the platform body is provided with a guardrail and a sampling hanging plate. The guardrail is arranged around the upper side of the platform body, and a sampling hanging plate is arranged on one side of the guardrail. The lower end of the sampling hanging plate is rotatably connected to the platform body, and the upper end of the sampling hanging plate is connected to the guardrail through a retractable zipper.

[0010] According to some embodiments of this utility model, the staircase is a retractable staircase, which includes multiple treads, a linkage assembly, and a drive component. The multiple treads are arranged from top to bottom, with the topmost tread fixedly connected to the platform body. The multiple treads are connected to each other through the linkage assembly. The drive component is used to drive the second tread located below the first tread and to move the tread located below the second tread.

[0011] According to some embodiments of this utility model, the linkage assembly includes multiple linkages. A corresponding first connecting portion is provided at the middle of the left and right sides of the first pedal at the top, and a corresponding second connecting portion is provided at the rear of the left and right sides of the first pedal. A corresponding third connecting portion is provided at the front of the left and right sides of each of the multiple intermediate pedals between the first pedal and the bottom last pedal, a corresponding fourth connecting portion is provided at the middle of each, and a corresponding fifth connecting portion is provided at the rear of each. A corresponding sixth connecting portion is provided at the front of the left and right sides of the last pedal, and a corresponding seventh connecting portion is provided at the middle of the left and right sides of the last pedal.

[0012] The first connecting part on the first pedal and the third connecting part on the second pedal are rotatably connected by a connecting rod. The second connecting part on the first pedal, the fourth connecting part on the second pedal, and the third connecting part on the third pedal located below the second pedal are rotatably connected by a connecting rod. The fifth connecting part, the fourth connecting part on the next pedal, and the third connecting part on the pedal after that are rotatably connected by a connecting rod. The sixth connecting part on the last pedal, the fourth connecting part on the adjacent previous pedal, and the fifth connecting part on the pedal after that are rotatably connected by a connecting rod. The seventh connecting part on the last pedal and the fifth connecting part on the adjacent previous pedal are rotatably connected by a connecting rod.

[0013] According to some embodiments of this utility model, the main body of the driving component is rotatably connected to the platform body, and the driving shaft of the driving component is rotatably connected to the third connecting part on the second pedal.

[0014] According to some embodiments of this utility model, the first conveying pipeline includes a main pipeline and multiple branch pipelines. The two ends of the main pipeline are respectively connected to the inlet of the intermediate tank and one of the branch pipelines, and the two ends of the remaining branch pipelines are respectively connected to the main pipeline and the tank truck.

[0015] According to some embodiments of this utility model, the second conveying pipeline includes a first pipeline, a second pipeline, and a third pipeline. The first pipeline is connected to the ethylene glycol storage tank and the second pipeline, respectively. The third pipeline is connected to the second outlet of the intermediate tank and the second pipeline, respectively. When multiple third pipelines are provided, the multiple second pipelines form an inverted U-shape.

[0016] According to some embodiments of the present invention, the first outlet of the intermediate tank is located at the upper end of the intermediate tank, the inlet of the intermediate tank is located at the side of the intermediate tank, and the second outlet of the intermediate tank is located at the lower end of the intermediate tank.

[0017] According to some embodiments of the present invention, the device further includes a discharge platform, which includes a platform body and two extension platforms. The two extension platforms are respectively disposed on opposite sides of the platform body, and the extension platforms extend upward at an angle from their bottom to their top toward the platform body.

[0018] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0019] The ethylene glycol tanker unloading device provided by this utility model is equipped with a sampling platform. The support component can abut against the ground when the device is in the sampling state to restrict the movement of the sampling platform and ensure stability during sampling. It facilitates the movement of the sampling platform to the tanker, enabling rapid sampling and avoiding the need for secondary pump start-up and shutdown during unloading. An intermediate tank is included to reduce cavitation and recover materials. The number of personnel required to supervise ethylene glycol unloading is reduced from 3 to 1, saving operation time and making operation convenient and safe. It can meet production needs, reduce the intensity of personnel operation, lower labor costs, and improve work efficiency and operational safety. Attached Figure Description

[0020] Appendix Figure 1 A structural view from the first perspective of the ethylene glycol tanker unloading device provided by this utility model;

[0021] Appendix Figure 2 A structural view from a second perspective of the ethylene glycol tanker unloading device provided by this utility model;

[0022] Appendix Figure 3 Structural diagram of the intermediate tank of the ethylene glycol tanker unloading device provided by this utility model;

[0023] Appendix Figure 4 A structural view from the first perspective of the sampling platform of the ethylene glycol tanker unloading device provided by this utility model;

[0024] Appendix Figure 5 A structural diagram from a second perspective of the sampling platform of the ethylene glycol tanker unloading device provided by this utility model;

[0025] Appendix Figure 6 A first-view structural diagram of the pedal and linkage assembly of the ethylene glycol tanker unloading device provided by this utility model;

[0026] Appendix Figure 7 A second-view structural diagram of the pedal and linkage assembly of the ethylene glycol tanker unloading device provided by this utility model;

[0027] Appendix Figure 8 Structural diagram of the connecting assembly of the ethylene glycol tanker unloading device provided by this utility model;

[0028] Appendix Figure 9 The structural diagram of the unloading platform of the ethylene glycol tanker unloading device provided by this utility model.

[0029] In the attached diagrams above:

[0030] 1-Sampling platform, 101-Platform body, 102-Support rod, 103-Support plate, 104-Guardrail, 105-Sampling hanging plate, 106-Zipper, 107-Drive component, 108-Pedal, 109-Connecting rod, 110-Fixed shaft, 111-First connecting part, 112-Second connecting part, 113-Third connecting part, 114-Fourth connecting part, 115-Fifth connecting part, 116-Sixth connecting part, 117-Seventh connecting part, 118-Moving wheel, 119-First rod, 120-Second rod;

[0031] 2-First conveying pipeline, 201-Main pipeline, 202-Branch pipeline; 3-Second conveying pipeline, 301-First pipeline, 302-Second pipeline, 303-Third pipeline, 304-Branch pipeline; 4-Intermediate tank, 401-Inlet, 402-First outlet, 403-Second outlet; 5-Unloading pump; 6-Unloading platform, 601-Platform body, 602-Extension platform; 7-Ethylene glycol storage tank; 8-Tank truck; 9-Sampling valve; 10-Recovery tank. Detailed Implementation

[0032] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] See Figures 1 to 8 The ethylene glycol tanker unloading device shown includes a sampling platform 1 and a conveying assembly, wherein:

[0035] The sampling table 1 includes a table body 101, stairs, and support components. The bottom of the table body 101 is equipped with casters 118. The support components are adjustable in height relative to the table body 101. The support components can abut against the ground when the device is in the sampling state (the sampling table 1 stops moving) to restrict the movement of the sampling table 1, ensure stability during sampling, and improve the safety of the operator during sampling operations.

[0036] See Figure 4-5 In some embodiments, the support includes a support rod 102 and a support plate 103. The support rod 102 extends vertically, and its upper end is rotatably connected to the platform body 101. The support plate 103 is disposed at the lower end of the support rod 102 and is disc-shaped. The support plate can rest against the ground when the device is in the sampling state to restrict the movement of the sampling platform 1. The support rod 102 is preferably a screw. By operating the support rod 102, the position of the support plate 103 is adjusted so that the support plate 103 is closer to or farther from the ground, thereby stopping or moving the sampling platform 1.

[0037] In some embodiments, multiple support members are provided, and the multiple support members are respectively arranged around the lower part of the sampling stage 1, preferably four support members are provided.

[0038] In some embodiments, the platform body 101 is provided with a guardrail 104 and a sampling hanging plate 105. The guardrail 104 is arranged around the upper side of the platform body 101 to protect the operator. The sampling hanging plate 105 is provided on one side of the guardrail 104. The lower end of the sampling hanging plate 105 is rotatably connected to the platform body 101, and the upper end of the sampling hanging plate 105 is connected to the guardrail 104 through a retractable zipper 106. When the device is in the initial state, the sampling hanging plate 105 extends vertically. When the device is in the sampling working state, the sampling hanging plate 105 extends horizontally to the sampling port on the tank truck 8, which makes it convenient for the operator to move along the sampling hanging plate 105 to the sampling port on the tank truck 8. This facilitates sampling while ensuring operational safety. The retractable zipper 106 makes it easy to retract the sampling hanging plate 105, which is convenient to move and does not take up space. When sampling station 1 is located in front of ethylene glycol tanker 8, it can take samples from the front sampling port of the vehicle; when sampling station 1 is located behind ethylene glycol tanker 8, it can take samples from the rear sampling port of the vehicle, saving employees' operating time and making it convenient and quick.

[0039] In some implementations, the staircase is a retractable staircase, which is easy to move and does not take up space.

[0040] In some embodiments, the staircase includes multiple treads 108, a linkage assembly, and a drive unit 107. The treads 108 are square plates, and each tread 108 is horizontally arranged in any state. The multiple treads 108 are arranged from top to bottom, and the uppermost tread 108 is fixedly connected to the platform body 101 through a fixed shaft 110. The multiple treads 108 are connected to each other through the linkage assembly. Preferably, there are two drive units 107, which are arranged opposite to each other. The two drive units 107 are rotatably connected to the opposite sides of the second tread 108 located below the first tread 108. The drive units 107 are used to drive the second tread 108 located below the first tread 108 and drive the tread 108 located below the second tread 108 to move, so that the multiple treads 108 expand and retract.

[0041] See Figure 4-7The linkage assembly includes multiple linkages 109. A first connecting portion 111 is located on the middle of the left and right sides of the topmost pedal 108. The center lines of the two first connecting portions 111 are aligned. A pivot can pass through both sides of the first pedal 108, with the opposite ends of the pivot extending out to the left and right sides of the first pedal 108 to form the first connecting portion 111. The front parts of the left and right sides of the first pedal 108 are not directly opposite the front parts of the left and right sides of the second pedal 108. A second connecting portion 112 is located on the rear parts of both the left and right sides of the first pedal 108. The center lines of the two second connecting portions 112 are aligned. A pivot can pass through both sides of the first pedal 108, with the opposite ends of the pivot extending out to the left and right sides of the first pedal 108 to form the second connecting portion 112.

[0042] Each of the multiple intermediate pedals 108 between the first pedal 108 and the last pedal 108 located at the bottom has a corresponding third connecting part 113 on the front of its left and right sides, a corresponding fourth connecting part 114 in its middle, and a corresponding fifth connecting part 115 at its rear. The center lines of the two third connecting parts 113 are aligned, the center lines of the two fourth connecting parts 114 are aligned, and the center lines of the two fifth connecting parts 115 are aligned. The center lines of the two third connecting parts 113, the two fourth connecting parts 114, and the two fifth connecting parts 115 are arranged parallel to each other. Alternatively, three rotating shafts can pass through the left and right sides of the last pedal 108, with the opposite ends of the three rotating shafts extending out to the left and right sides of the last pedal 108, respectively forming the third connecting part 113, the fourth connecting part 114, and the fifth connecting part 115.

[0043] The left and right front parts of the last pedal 108 are each provided with a corresponding sixth connecting part 116. The center lines of the two sixth connecting parts 116 are aligned. A pivot can pass through the left and right sides of the last pedal 108, with the opposite ends of the pivot extending out to the left and right sides of the last pedal 108 to form the sixth connecting part 116. The middle parts of the left and right sides of the last pedal 108 are each provided with a corresponding seventh connecting part 117. The center lines of the two seventh connecting parts 117 are aligned. A pivot can pass through the left and right sides of the last pedal 108, with the opposite ends of the pivot extending out to the left and right sides of the last pedal 108 to form the seventh connecting part 117. There are no connecting parts at the rear of the left and right sides of the last pedal 108, and the rear of the left and right sides of the last pedal 108 are not directly opposite the rear of the left and right sides of the previous pedal 108.

[0044] The first connecting part 111 on the first pedal 108 and the third connecting part 113 on the second pedal 108 are rotatably connected by a connecting rod. The second connecting part 112 on the first pedal 108, the fourth connecting part 114 on the second pedal 108 and the third connecting part 113 on the third pedal 108 located below the second pedal 108 are rotatably connected by a connecting rod. The fifth connecting part 115, the fourth connecting part 114 on the next pedal 108 and the third connecting part 113 on the next pedal 108 are rotatably connected by a connecting rod. The sixth connecting part 116 on the last pedal 108, the fourth connecting part 114 on the adjacent previous pedal 108 and the fifth connecting part 115 on the next previous pedal 108 are rotatably connected by a connecting rod. The seventh connecting part 117 on the last pedal 108 and the fifth connecting part 115 on the adjacent previous pedal 108 are rotatably connected by a connecting rod.

[0045] When the drive unit 107 is activated, it drives the other pedals 108 below the first pedal 108 to extend or retract. When retracted, they are convenient for storage and transportation. When needed, the other pedals 108 below the first pedal 108 extend. This facilitates both operation and storage.

[0046] In some embodiments, the drive shafts of the two drive members 107 are rotatably connected to the third connecting portion 113 on the second pedal 108; or, see... Figure 9 The first connecting part 111 on the first pedal 108 and the third connecting part 113 on the second pedal 108 are connected by a connecting rod 109. The drive shaft of the drive member 107 is rotatably connected to the connecting rod 109 through a connecting assembly. The connecting assembly includes a first rod 119 and a second rod 120. The two ends of the first rod 119 are rotatably connected to the drive shaft of the drive member 107 and one end of the second rod 120, respectively. The other end of the second rod 120 is rotatably connected to the connecting rod 109 between the first connecting part 111 on the first pedal 108 and the third connecting part 113 on the second pedal 108.

[0047] In this example, the material conveying assembly includes a first conveying pipeline 2, a second conveying pipeline 3, an intermediate tank 4, and an unloading pump 5. The intermediate tank 4 has an inlet 401, a first outlet 402, and a second outlet 403. The inlet 401 is located between the first outlet 402 and the second outlet 403, that is, the first outlet 402 is positioned higher than the inlet 401, and the inlet 401 is positioned higher than the second outlet 403. The first outlet 402 is used to connect to the atmosphere or the recovery tank 10. The two ends of the first conveying pipeline 2 are respectively used to connect to the tank truck and the inlet 401 of the intermediate tank 4. The two ends of the second conveying pipeline 3 are respectively connected to the second outlet 403 of the intermediate tank 4 and the ethylene glycol storage tank 7. The unloading pump 5 is installed on the second conveying pipeline 3.

[0048] Because the first conveying pipeline 2 and the second conveying pipeline 3 are relatively long, and the air inside the first conveying pipeline 2 and the second conveying pipeline 3 is not easy to expel, it is necessary to start and stop the unloading pump multiple times each time to vent the air. An intermediate tank 4 is set up so that the air and ethylene glycol can be discharged into the intermediate tank 4 by using potential energy. Then, the air is discharged through the first outlet 402 (to reduce cavitation). Then, the second conveying pipeline 3 is connected to the second outlet 403 at the bottom of the intermediate tank 4 for material transportation. After unloading, a hose can be connected to the first outlet 402. The hose is connected to the recovery tank 10 to recover the ethylene glycol in the intermediate tank 4, which reduces the workload of employees and improves work efficiency.

[0049] In some embodiments, the first outlet 402 of the intermediate tank 4 is located at the upper end of the intermediate tank 4, the inlet 401 of the intermediate tank 4 is located at the side of the intermediate tank 4, and the second outlet 403 of the intermediate tank 4 is located at the lower end of the intermediate tank 4.

[0050] In some embodiments, when multiple tank cars unload simultaneously, the first conveying pipeline 2 includes a main pipeline 201 and multiple branch pipelines 202. The two ends of the main pipeline 201 are respectively connected to the inlet 401 of the intermediate tank 4 and one branch pipeline 202. The two ends of the remaining branch pipelines 202 are respectively connected to the main pipeline 201 and the tank car 8. A sampling valve 9 is installed on each branch pipeline 202. Multiple branch pipelines 202 are provided, each corresponding to one tank car 8, enabling simultaneous unloading of multiple tank cars. Alternatively, when multiple tank cars unload simultaneously, multiple conveying assemblies can be provided.

[0051] In some embodiments, the second conveying pipeline 3 includes a first pipeline 301, a second pipeline 302, and a third pipeline 303. The first pipeline 301 is connected to the ethylene glycol storage tank 7 and the second pipeline 302, respectively. The third pipeline 303 is connected to the second outlet 403 of the intermediate tank 4 and the second pipeline 302, respectively. When there are two third pipelines 303, the multiple second pipelines 302 form an inverted U-shape. Multiple branches 304 can be provided on the first pipeline 301, and the branches 304 are connected to the ethylene glycol storage tank 7.

[0052] In some embodiments, the device further includes a discharge platform 6 with a trapezoidal cross-section. The discharge platform 6 includes a main body 601 and two extension platforms 602. The main body 601 has an upper plane, and the two extension platforms 602 are respectively disposed on opposite sides of the main body 601. The extension platforms 602 extend upward at an incline from their bottom to their top towards the main body 601. The extension platforms 602 have inclined surfaces, with one side of the inclined surface of one extension platform 602 sharing one side with the upper plane of the main body 601, and the other side of the inclined surface of the other extension platform 602 sharing the other side with the upper plane of the main body 601. When the tank truck is unloaded horizontally, the ethylene glycol is not completely unloaded in the final stage of unloading, requiring multiple starts and stops of the unloading pump 5. By setting up the discharge platform 6, the tank truck is positioned on the extension platforms 602, allowing the tank truck to be tilted, which facilitates the discharge of ethylene glycol from the tank truck in one go, saving unloading time.

[0053] The ethylene glycol tanker unloading device provided by this utility model is equipped with a sampling platform. The support component can abut against the ground when the device is in the sampling state to limit the movement of the sampling platform and ensure stability during sampling. It is easy to move to the tanker, allows for rapid sampling, and avoids the need for secondary pump start-up and shutdown during unloading. An intermediate tank is set up to reduce cavitation and recover materials. The number of supervisors during ethylene glycol unloading is reduced from 3 to 1, saving 150 minutes of operation time, and making the operation more convenient and safer. It can meet production needs, reduce the intensity of personnel operation, reduce labor costs, and improve work efficiency and operational safety.

[0054] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. An ethylene glycol tanker unloading device, characterized in that, The device includes a sampling platform and a material conveying assembly. The sampling platform includes a platform body, a staircase, and a support member. The bottom of the platform body is equipped with casters. The support member is adjustable in height relative to the platform body and is mounted on the platform body. The support member is able to rest against the ground when the device is in the sampling state. The material conveying assembly includes a first conveying pipeline, a second conveying pipeline, an intermediate tank, and an unloading pump. The intermediate tank has an inlet, a first outlet, and a second outlet. The first outlet is positioned higher than the inlet, and the inlet is positioned higher than the second outlet. The first outlet is used to connect to the atmosphere or a recovery tank. The opposite ends of the first conveying pipeline are respectively used to connect to the tank truck and the inlet of the intermediate tank. The opposite ends of the second conveying pipeline are respectively connected to the second outlet of the intermediate tank and the ethylene glycol storage tank. The unloading pump is installed on the second conveying pipeline.

2. The ethylene glycol tanker unloading device according to claim 1, characterized in that, The support member includes a support rod and a support plate. The support rod extends vertically and is located at the lower part of the platform body. The upper end of the support rod is rotatably connected to the platform body, and the support plate is located at the lower end of the support rod.

3. The ethylene glycol tanker unloading device according to claim 1, characterized in that, The platform body is equipped with a guardrail and a sampling hanging plate. The guardrail is arranged around the upper side of the platform body, and a sampling hanging plate is arranged on one side of the guardrail. The lower end of the sampling hanging plate is rotatably connected to the platform body, and the upper end of the sampling hanging plate is connected to the guardrail through a retractable zipper.

4. The ethylene glycol tanker unloading device according to claim 1, characterized in that, The staircase is a retractable staircase, which includes multiple treads, a linkage assembly, and a drive unit. The multiple treads are arranged from top to bottom, with the topmost tread fixedly connected to the platform body. The multiple treads are connected to each other through the linkage assembly. The drive unit is used to drive the second tread located below the first tread and to move the tread located below the second tread.

5. The ethylene glycol tanker unloading device according to claim 4, characterized in that, The linkage assembly includes multiple linkages. A first connecting part is provided on the middle of the left and right sides of the topmost pedal, and a second connecting part is provided on the rear of the left and right sides of the topmost pedal. A third connecting part is provided on the front of the left and right sides of each of the multiple intermediate pedals between the topmost pedal and the bottommost pedal, a fourth connecting part is provided in the middle, and a fifth connecting part is provided at the rear. A sixth connecting part is provided on the front of the left and right sides of the bottommost pedal, and a seventh connecting part is provided on the middle of the left and right sides of the bottommost pedal. The first connecting part on the first pedal and the third connecting part on the second pedal are rotatably connected by a connecting rod. The second connecting part on the first pedal, the fourth connecting part on the second pedal, and the third connecting part on the third pedal located below the second pedal are rotatably connected by a connecting rod. The fifth connecting part, the fourth connecting part on the next pedal, and the third connecting part on the pedal after that are rotatably connected by a connecting rod. The sixth connecting part on the last pedal, the fourth connecting part on the adjacent previous pedal, and the fifth connecting part on the pedal after that are rotatably connected by a connecting rod. The seventh connecting part on the last pedal and the fifth connecting part on the adjacent previous pedal are rotatably connected by a connecting rod.

6. The ethylene glycol tanker unloading device according to claim 5, characterized in that, The main body of each drive component is rotatably connected to the main body of the platform, and the drive shaft of each drive component is rotatably connected to the third connecting part on the second pedal.

7. The ethylene glycol tanker unloading device according to claim 1, characterized in that, The first conveying pipeline includes a main pipeline and multiple branch pipelines. The two ends of the main pipeline are respectively connected to the inlet of the intermediate tank and one of the branch pipelines, and the two ends of the remaining branch pipelines are respectively connected to the main pipeline and the tank truck.

8. The ethylene glycol tanker unloading device according to claim 1, characterized in that, The second conveying pipeline includes a first pipeline, a second pipeline, and a third pipeline. The first pipeline is connected to the ethylene glycol storage tank and the second pipeline, respectively. The third pipeline is connected to the second outlet of the intermediate tank and the second pipeline, respectively. When there are multiple third pipelines, the multiple second pipelines form an inverted U-shape.

9. The ethylene glycol tanker unloading device according to claim 1, characterized in that, The first outlet of the intermediate tank is located at the upper end of the intermediate tank, the inlet of the intermediate tank is located at the side of the intermediate tank, and the second outlet of the intermediate tank is located at the lower end of the intermediate tank.

10. The ethylene glycol tanker unloading device according to claim 1, characterized in that, The device also includes a discharge platform, which includes a platform body and two extension platforms. The two extension platforms are respectively disposed on opposite sides of the platform body, and the extension platforms extend upward at an angle from their bottom to their top toward the platform body.

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