An exhaust gas recovery device for tank truck loading and a method of using the same

Abstract

The invention discloses an exhaust gas recovery device for tank truck loading and a method of using the device. The device comprises: a main body, a switching mechanism and an air storage mechanism. The main body comprises a recovery bin, a shell is fixedly connected to the front side of the recovery bin, a first three-way valve is fixedly connected to the top of the shell, the valve stem of the first three-way valve passes through the top of the shell and is rotatably connected to the shell, the first three-way valve is matched with an air pump, a second connecting pipe and a third connecting pipe, and the air pump is fixedly connected to the top of the shell. The beneficial effect is: by arranging the switching mechanism to cooperate with the air storage mechanism, the device can separately store the low-concentration oil and gas in the early stage of tank truck loading through an air bag, and at the end of loading, the low-concentration oil and gas stored in the air bag is used to send the high-concentration oil and gas in the pipeline to the recovery equipment, so that the residual oil and gas in the pipeline is replaced by the high-concentration oil and gas with the low-concentration oil and gas, thereby reducing the consequences of oil and gas leakage.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas recovery, and in particular to an tail gas recovery device for tank truck loading and a use method thereof. Background Art

[0002] Tank truck loading exhaust gas recovery refers to the process of recovering oil and gas in the tank during the refueling process of the tank truck. By recycling the loading exhaust gas, it can reduce environmental pollution and improve energy utilization efficiency.

[0003] In the existing tank truck loading exhaust gas recovery process, the tank truck is usually connected to the recovery equipment through an oil and gas recovery pipeline to ensure that the exhaust gas is recovered to the recovery equipment during the loading process. After the loading is completed, a large amount of high-concentration oil and gas still remains in the recovery pipeline. These high-concentration oil and gas are prone to leakage when the pipeline is disconnected from the tank truck, posing a great safety hazard. Therefore, an exhaust gas recovery device for tank truck loading and a method of using the same are proposed. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] The present invention has been proposed in view of the above-mentioned problems.

[0006] Therefore, the object of the present invention is to provide an exhaust gas recovery device for tank truck loading and a method of using the same, which is used to solve the problems of high concentration of oil and gas remaining in the recovery pipeline in the prior art, which poses a great safety hazard.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: an exhaust gas recovery device for tank truck loading, comprising:

[0008] The main body comprises a recovery bin, the front side of the recovery bin is fixedly connected to a shell, the top of the shell is fixedly connected to a first three-way valve, the valve stem of the first three-way valve passes through the top of the shell and is rotatably connected to the shell, the first three-way valve is matched with an air extraction pump, a second connecting pipe and a third connecting pipe, the air extraction pump is fixedly connected to the top of the shell, the air outlet of the air extraction pump, the second connecting pipe and the third connecting pipe are respectively fixedly connected to three groups of valve ports of the first three-way valve, the side wall of the third connecting pipe is fixedly connected to the first connecting pipe, one end of the first connecting pipe away from the third connecting pipe is fixedly connected to the recovery bin, the air outlet of the air extraction pump and one end of the third connecting pipe away from the first three-way valve are respectively fixedly connected to a fourth connecting pipe and a fifth connecting pipe, the fourth connecting pipe and the fifth connecting pipe are matched with the second three-way valve, two groups of valve ports of the second three-way valve are respectively fixedly connected to the fourth connecting pipe and the fifth connecting pipe, and the last group of valve ports of the second three-way valve is fixedly connected to an oil and gas joint;

[0009] The switching mechanism comprises a mounting column arranged in the shell, the mounting column is fixedly connected to the end of the valve stem of the first three-way valve, the side wall of the mounting column is fixedly connected to a connecting rod, the top of the side wall of the connecting rod is fixedly connected to a push-pull column, the top inner wall of the shell is fixedly connected to a fixing column, a tension spring is arranged between the fixing column and the push-pull column, the two ends of the tension spring are respectively hooked on the push-pull column and the fixing column, the top inner wall of the shell is also fixedly connected to a limiting column, the connecting rod is located between the two groups of limiting columns, and the angle formed by the two groups of limiting columns and the mounting column is 90°, and a movable slat is also slidably arranged in the shell, the movable slat is located below the tension spring, and a slide groove is opened on the plate surface of the movable slat along the length direction, and the push-pull column is inserted into the slide groove;

[0010] The air storage mechanism includes a sliding slat slidably arranged in the recovery bin, an air bag is arranged between the sliding slat and the inner wall of the recovery bin close to the shell side, the two sides of the air bag are respectively fixedly connected to the inner wall of the recovery bin and the sliding slat, the two sides of the air bag are open, the first connecting pipe is located opposite to the air bag and is connected to the air bag, a push-pull cylinder is arranged inside the air bag, the push-pull cylinder is fixedly connected to the sliding slat and is horizontally arranged, the push-pull cylinder is matched with a push-pull rod, the push-pull rod horizontally penetrates the recovery bin, the shell and the push-pull cylinder and is slidably connected to the recovery bin, the shell and the push-pull cylinder, a slider is also slidably connected in the push-pull cylinder, the slider is fixedly connected to the end of the push-pull rod, and the end of the push-pull rod away from the slider is fixedly connected to the movable slat;

[0011] Among them, the tension spring is located below the mounting column and two groups of limit columns, the distances from the two groups of limit columns to the fixed column are equal, when the connecting rod is in contact with a group of limit columns far away from the recovery bin, the vacuum pump is connected to the first connecting pipe, and the airbag is in a relaxed state at this time, when the other group of limit columns of the connecting rod is in contact with the vacuum pump is connected to the second connecting pipe, and the airbag is in an inflated state at this time, and the second connecting pipe is externally connected to the oil and gas condensation recovery equipment.

[0012] As a preferred solution of the exhaust gas recovery device for tank truck loading described in the present invention, the main body also includes two groups of support rods, and the two groups of support rods are fixedly connected to the side of the bottom of the shell away from the recovery bin and are symmetrically arranged.

[0013] As a preferred solution of the exhaust gas recovery device for tank truck loading described in the present invention, two groups of parallel sliding bars are arranged in the shell, and the two ends of the two groups of sliding bars are respectively fixedly connected to the inner walls on both sides of the shell, and the positions of the movable slats facing the two groups of sliding bars are provided with through holes, and the two groups of sliding bars respectively pass through the two groups of through holes, and the movable slats are slidably arranged in the shell by cooperating with the two groups of sliding bars.

[0014] As a preferred solution of the exhaust gas recovery device for tank truck loading described in the present invention, the sliding slats are provided with openings at four corners, four groups of the openings are equipped with mounting rods, both ends of the four groups of mounting rods are respectively fixedly connected to the inner walls on both sides of the recovery bin, and the sliding slats are slidably arranged in the recovery bin by cooperating with the four groups of mounting rods.

[0015] As a preferred solution of the exhaust gas recovery device for tank truck loading described in the present invention, the airbag is made of rubber material, and a plurality of groups of annular folds are equidistantly arranged on the airbag along the length direction.

[0016] As a preferred solution of the exhaust gas recovery device for tank truck loading described in the present invention, the fourth connecting pipe and the fifth connecting pipe are both hoses, and the recovery bin is made of stainless steel.

[0017] As a preferred solution of the exhaust gas recovery device for tank truck loading described in the present invention, the mounting column, connecting rod, push-pull column, fixed column, limit column and movable slat are all made of stainless steel, and the surfaces of the push-pull column, fixed column and movable slat are smooth.

[0018] As a preferred solution of the exhaust gas recovery device for tank truck loading described in the present invention, the bottoms of the two groups of support rods are flush with the bottom of the recovery bin, and the two groups of support rods are made of stainless steel.

[0019] As a preferred solution of the exhaust gas recovery device for tank truck loading described in the present invention, the mounting column is arranged to coincide with the axis of the valve stem of the first three-way valve, and the length of the tension spring when the expansion amount is zero is smaller than the distance from the push-pull column to the fixed column.

[0020] Based on the above-mentioned exhaust gas recovery device for tank truck loading, the present invention additionally provides a preferred solution for a method of using the exhaust gas recovery device for tank truck loading, which specifically includes the following steps:

[0021] S1, initial state, the airbag is relaxed, the air pump is connected to the first connecting pipe and the third connecting pipe, the second three-way valve is turned to connect the second three-way valve to the fourth connecting pipe, and the oil and gas joint is connected to the oil and gas recovery interface of the tank truck;

[0022] S2, at the beginning of loading, the oil and gas concentration in the tank truck is low. At this time, the low-concentration oil and gas enter the air bag after passing through the oil and gas joint, the second three-way valve, the fourth connecting pipe, the vacuum pump, the first three-way valve, the third connecting pipe, and the first connecting pipe in sequence. The air bag gradually swells, and the sliding slats drive the air bag to move downward in the direction away from the shell. The sliding slats drive the push-pull cylinder to move synchronously. After moving for a period of time, the slider presses against the inner wall of the push-pull cylinder close to the shell. At this time, after a period of perfusion, the oil and gas concentration in the tank truck gradually increases, and the sliding slats continue to drive the push-pull cylinder. The cylinder moves, the push-pull cylinder pulls the push-pull rod through the slider, the push-pull rod pulls the movable slat, and when the movable slat moves, it pulls the connecting rod through the push-pull column, and the connecting rod rotates. When the connecting rod rotates more than 45 degrees, the tension of the tension spring pulls the push-pull column, so that the connecting rod quickly rotates to a group of limit columns close to the recovery bin. At this time, the first three-way valve is connected with the vacuum pump and the second connecting pipe, and the high-concentration oil and gas are successively input into the oil and gas condensation recovery equipment through the oil and gas joint, the second three-way valve, the fourth connecting pipe, the vacuum pump, the first three-way valve, and the second connecting pipe;

[0023] S3, after loading is completed, turn the second three-way valve to connect the fourth connecting pipe with the fifth connecting pipe. At this time, the low-concentration oil and gas in the airbag passes through the first connecting pipe, the third connecting pipe, the fifth connecting pipe, the second three-way valve, the fourth connecting pipe, the vacuum pump, the first three-way valve, and the second connecting pipe in turn, and then enters the oil and gas condensation recovery equipment. The high-concentration oil and gas in the fourth connecting pipe, the vacuum pump, the first three-way valve, and the second connecting pipe are replaced by low-concentration oil and gas. During the release of the low-concentration oil and gas in the airbag, the airbag gradually relaxes, driving the sliding slats to move to one side of the shell, and the sliding slats drive the push-pull cylinder to move synchronously. After moving for a period of time, the push-pull cylinder is close to one side of the sliding slats. The inner wall resists the slider, and when it continues to move, the push-pull cylinder pushes the push-pull rod to move synchronously through the slider, and the push-pull rod pushes the movable slat to move, and the movable slat drives the connecting rod to rotate through the push-pull column. When the rotation degree of the connecting rod is greater than 45°, under the tension of the tension spring, the connecting rod rotates rapidly to fit a set of limit columns away from the recovery bin. At this time, the first three-way valve is connected to the vacuum pump and the third connecting pipe, the device is reset, and the second three-way valve is turned to connect the oil and gas joint with the fourth connecting pipe, and the connection between the oil and gas joint and the tank truck is disconnected. The vacuum pump sends the low-concentration oil and gas in the fourth connecting pipe, the second three-way valve, the oil and gas joint and the second connecting pipe to the recovery equipment to complete the recovery.

[0024] Beneficial effects of the present invention:

[0025] 1. By setting up a switching mechanism and cooperating with the gas storage mechanism, the device can store the low-concentration oil and gas in the early stage of tank truck loading separately through the air bag. At the end of loading, the low-concentration oil and gas stored in the air bag is used to send the high-concentration oil and gas in the pipeline to the recovery equipment, so that the residual oil and gas in the pipeline is replaced by low-concentration oil and gas from high-concentration oil and gas, reducing the consequences of oil and gas leakage.

[0026] 2. By setting up a switching mechanism, when the device is used, only the second three-way valve needs to be turned to automatically store low-concentration oil and gas in the early stage of loading. After loading, the high-concentration oil and gas in the pipeline will be automatically sent to the recovery equipment through the low-concentration oil and gas. It is simple to operate and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0028] Figure 1 The present invention is a schematic diagram of the three-dimensional structure of an exhaust gas recovery device for tank truck loading.

[0029] Figure 2The present invention is a schematic diagram of the cross-sectional structure of the bottom of the shell portion of an exhaust gas recovery device for tank truck loading.

[0030] Figure 3 For the present invention Figure 2 A magnified view of the structure of area A.

[0031] Figure 4 The present invention is a schematic cross-sectional structural diagram of a recovery chamber portion of an exhaust gas recovery device for tank truck loading.

[0032] Figure 5 For the present invention Figure 4 A magnified view of the structure of region B.

[0033] Figure 6 For the present invention Figure 4 Enlarged view of the structure of the middle C region.

[0034] Figure 7 The present invention is a schematic diagram of the switching mechanism of an exhaust gas recovery device for tank truck loading.

[0035] Figure 8 The present invention is a schematic diagram of the top view of the exhaust gas recovery device for tank truck loading.

[0036] Description of the drawings: 100, main body; 101, recovery bin; 102, shell; 103, first three-way valve; 104, vacuum pump; 105, first connecting pipe; 106, second connecting pipe; 107, third connecting pipe; 108, fourth connecting pipe; 109, fifth connecting pipe; 110, second three-way valve; 111, oil and gas connector; 112, support rod; 200, switching mechanism; 201, mounting column; 202, connecting rod; 203, push-pull column; 204, fixed column; 205, tension spring; 206, limit column; 207, slide rod; 208, movable slat; 300, gas storage mechanism; 301, sliding slat; 302, mounting rod; 303, air bag; 304, push-pull cylinder; 305, push-pull rod; 306, slider. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0040] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0041] Example 1

[0042] An exhaust gas recovery device for tank truck loading, comprising:

[0043] The main body 100 includes a recovery bin 101, a housing 102 is fixedly connected to the front side of the recovery bin 101, a first three-way valve 103 is fixedly connected to the top of the housing 102, a valve stem of the first three-way valve 103 passes through the top of the housing 102 and is rotatably connected to the housing 102, the first three-way valve 103 is matched with an air pump 104, a second connecting pipe 106 and a third connecting pipe 107, the air pump 104 is fixedly connected to the top of the housing 102, the air outlet of the air pump 104, the second connecting pipe 106 and the third connecting pipe 107 are respectively fixedly connected to the three valve ports of the first three-way valve 103, and the side of the third connecting pipe 107 is fixedly connected to the third connecting pipe 107. The wall is fixedly connected with a first connecting pipe 105, and one end of the first connecting pipe 105 away from the third connecting pipe 107 is fixedly connected with the recovery bin 101, and the gas outlet of the vacuum pump 104 and one end of the third connecting pipe 107 away from the first three-way valve 103 are fixedly connected with a fourth connecting pipe 108 and a fifth connecting pipe 109 respectively, and the fourth connecting pipe 108 and the fifth connecting pipe 109 are matched with a second three-way valve 110, and two groups of valve ports of the second three-way valve 110 are fixedly connected with the fourth connecting pipe 108 and the fifth connecting pipe 109 respectively, and the last group of valve ports of the second three-way valve 110 is fixedly connected with an oil and gas joint 111;

[0044] The switching mechanism 200 includes a mounting column 201 disposed in the housing 102, the mounting column 201 is fixedly connected to the end of the valve stem of the first three-way valve 103, the side wall of the mounting column 201 is fixedly connected to a connecting rod 202, the top of the side wall of the connecting rod 202 is fixedly connected to a push-pull column 203, the top inner wall of the housing 102 is fixedly connected to a fixed column 204, a tension spring 205 is arranged between the fixed column 204 and the push-pull column 203, the two ends of the tension spring 205 are respectively hooked on the push-pull column 203 and the fixed column 204, the top inner wall of the housing 102 is also fixedly connected to a limiting column 206, the connecting rod 202 is located between the two groups of limiting columns 206, and the two groups of limiting columns The angle formed by 206 and the mounting column 201 is 90°, and a movable slat 208 is also slidably arranged in the shell 102. Two sets of mutually parallel slide bars 207 are arranged in the shell 102. Both ends of the two sets of slide bars 207 are respectively fixedly connected to the inner walls of the shell 102 on both sides. Through holes are provided at the positions of the movable slat 208 facing the two sets of slide bars 207. The two sets of slide bars 207 pass through the two sets of through holes respectively. The movable slat 208 is slidably arranged in the shell 102 by cooperating with the two sets of slide bars 207. The movable slat 208 is located below the tension spring 205. A sliding groove is provided on the surface of the movable slat 208 along the length direction, and the push-pull column 203 is inserted into the sliding groove.

[0045] The gas storage mechanism 300 includes a sliding slat 301 slidably arranged in the recovery bin 101. The sliding slat 301 has openings at four corners. The four groups of openings are matched with mounting rods 302. The two ends of the four groups of mounting rods 302 are respectively fixedly connected to the inner walls of the recovery bin 101 on both sides. The sliding slat 301 is slidably arranged in the recovery bin 101 by matching with the four groups of mounting rods 302. An air bag 303 is arranged between the sliding slat 301 and the inner wall of the recovery bin 101 close to the shell 102. The two sides of the air bag 303 are respectively fixedly connected to the inner wall of the recovery bin 101 and the sliding slat 301. The two sides of the air bag 303 are open. The first connection The through pipe 105 is located opposite to the airbag 303 and is connected to the airbag 303. A push-pull cylinder 304 is arranged inside the airbag 303. The push-pull cylinder 304 is fixedly connected to the sliding slat 301 and arranged horizontally. The push-pull cylinder 304 is matched with a push-pull rod 305. The push-pull rod 305 horizontally penetrates the recovery bin 101, the shell 102 and the push-pull cylinder 304 and is slidably connected to the recovery bin 101, the shell 102 and the push-pull cylinder 304. A slider 306 is also slidably connected in the push-pull cylinder 304. The slider 306 is fixedly connected to the end of the push-pull rod 305. The end of the push-pull rod 305 away from the slider 306 is fixedly connected to the movable slat 208.

[0046] Among them, the tension spring 205 is located below the installation column 201 and the two groups of limit columns 206. The distances between the two groups of limit columns 206 and the fixed column 204 are equal. When the connecting rod 202 is in contact with a group of limit columns 206 far away from the recovery bin 101, the vacuum pump 104 is connected to the first connecting pipe 105. At this time, the airbag 303 is in a relaxed state. When the other group of limit columns 206 of the connecting rod 202 are in contact with each other, the vacuum pump 104 is connected to the second connecting pipe 106. At this time, the airbag 303 is in an inflated state, and the second connecting pipe 106 is externally connected to the oil and gas condensation recovery equipment.

[0047] In addition, the main body 100 also includes two groups of support rods 112, which are fixedly connected to the bottom of the shell 102 on one side away from the recovery bin 101 and are symmetrically arranged. The two groups of support rods 112 are used to support the shell 102 to improve the stability of the device.

[0048] In addition, the airbag 303 is made of rubber material, and multiple groups of annular folds are equidistantly arranged along the length direction of the airbag 303. The fourth connecting pipe 108 and the fifth connecting pipe 109 are both hoses. The recovery bin 101 is made of stainless steel material. The mounting column 201, the connecting rod 202, the push-pull column 203, the fixed column 204, the limit column 206 and the movable slat 208 are all made of stainless steel material. The push-pull column 203, the fixed column 204 and the movable slat 208 have smooth surfaces. The stainless steel material is corrosion-resistant, and the smooth surface is used to reduce friction to ensure stable operation of the device.

[0049] It should be noted that the bottom of the two groups of support rods 112 are flush with the bottom of the recovery bin 101, and the two groups of support rods 112 are made of stainless steel. The mounting column 201 is arranged to coincide with the axis of the valve stem of the first three-way valve 103, and the length of the tension spring 205 when the expansion and contraction amount is zero is less than the distance from the push-pull column 203 to the fixed column 204.

[0050] Example 2

[0051] A method for using an exhaust gas recovery device for tank truck loading, based on Example 1, specifically comprises the following steps:

[0052] S1, initial state, the airbag 303 is relaxed, the air pump 104 is connected with the first connecting pipe 105 and the third connecting pipe 107, the second three-way valve 110 is turned to connect with the fourth connecting pipe 108, and the oil and gas joint 111 is connected with the oil and gas recovery interface of the tank truck;

[0053] S2, at the initial stage of loading, the oil and gas concentration in the tank truck is low. At this time, the low-concentration oil and gas pass through the oil and gas joint 111, the second three-way valve 110, the fourth connecting pipe 108, the vacuum pump 104, the first three-way valve 103, the third connecting pipe 107, and the first connecting pipe 105 in sequence and then enter the airbag 303. The airbag 303 gradually swells, and the sliding slat 301 drives the airbag 303 to move downward in the direction away from the shell 102. The sliding slat 301 drives the push-pull cylinder 304 to move synchronously. After moving for a period of time, the slider 306 presses against the inner wall of the push-pull cylinder 304 on one side close to the shell 102. At this time, after a period of perfusion, the oil and gas concentration in the tank truck gradually increases, and the sliding slat 301 continues to drive the push-pull cylinder 304 to move. 304 pulls the push-pull rod 305 through the slider 306, and the push-pull rod 305 pulls the movable slat 208. When the movable slat 208 moves, it pulls the connecting rod 202 through the push-pull column 203, and the connecting rod 202 rotates. When the connecting rod 202 rotates more than 45 degrees, the tension of the tension spring 205 pulls the push-pull column 203, so that the connecting rod 202 quickly rotates to a group of limit columns 206 close to the recovery bin 101. At this time, the first three-way valve 103 is connected with the vacuum pump 104 and the second connecting pipe 106, and the high-concentration oil and gas are successively input into the oil and gas condensation recovery equipment through the oil and gas joint 111, the second three-way valve 110, the fourth connecting pipe 108, the vacuum pump 104, the first three-way valve 103, and the second connecting pipe 106;

[0054] S3, after loading is completed, the second three-way valve 110 is rotated to connect the fourth connecting pipe 108 with the fifth connecting pipe 109. At this time, the low-concentration oil and gas in the airbag 303 passes through the first connecting pipe 105, the third connecting pipe 107, the fifth connecting pipe 109, the second three-way valve 110, the fourth connecting pipe 108, the vacuum pump 104, the first three-way valve 103, and the second connecting pipe 106 in sequence and then enters the oil and gas condensation recovery equipment. The high-concentration oil and gas in the fourth connecting pipe 108, the vacuum pump 104, the first three-way valve 103 and the second connecting pipe 106 are replaced by the low-concentration oil and gas. During the release of the low-concentration oil and gas in the airbag 303, the airbag 303 gradually relaxes, driving the sliding strip 301 to move toward one side of the shell 102, and the sliding strip 301 drives the push-pull cylinder 304 to move synchronously. After moving for a period of time, the push-pull cylinder 304 is close to the inner wall of one side of the sliding strip 301. The slider 306 is held, and when it continues to move, the push-pull cylinder 304 pushes the push-pull rod 305 to move synchronously through the slider 306, and the push-pull rod 305 pushes the movable slat 208 to move, and the movable slat 208 drives the connecting rod 202 to rotate through the push-pull column 203. When the rotation degree of the connecting rod 202 is greater than 45°, under the tension of the tension spring 205, the connecting rod 202 rotates rapidly until it is in contact with a set of limit columns 206 away from the recovery bin 101. At this time, the first three-way valve 103 is connected with the vacuum pump 104 and the third connecting pipe 107, the device is reset, and the second three-way valve 110 is rotated to connect the oil and gas joint 111 with the fourth connecting pipe 108, and the connection between the oil and gas joint 111 and the tank truck is disconnected. The vacuum pump 104 sends the low-concentration oil and gas in the fourth connecting pipe 108, the second three-way valve 110, the oil and gas joint 111 and the second connecting pipe 106 to the recovery equipment to complete the recovery.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An exhaust gas recovery device for tank truck loading, characterized in that: include: The main body (100) comprises a recovery bin (101), the front side of the recovery bin (101) is fixedly connected to a shell (102), the top of the shell (102) is fixedly connected to a first three-way valve (103), the valve stem of the first three-way valve (103) passes through the top of the shell (102) and is rotatably connected to the shell (102), the first three-way valve (103) is matched with an air pump (104), a second connecting pipe (106) and a third connecting pipe (107), the air pump (104) is fixedly connected to the top of the shell (102), the air outlet of the air pump (104), the second connecting pipe (106) and the third connecting pipe (107) are respectively fixedly connected to the three valve ports of the first three-way valve (103), and the third connecting pipe (107) is fixedly connected to the top of the shell (102). A first connecting pipe (105) is fixedly connected to the side wall of the valve (107); one end of the first connecting pipe (105) away from the third connecting pipe (107) is fixedly connected to the recovery bin (101); the gas outlet of the air pump (104) and one end of the third connecting pipe (107) away from the first three-way valve (103) are fixedly connected to a fourth connecting pipe (108) and a fifth connecting pipe (109), respectively; the fourth connecting pipe (108) and the fifth connecting pipe (109) are matched with a second three-way valve (110); two groups of valve ports of the second three-way valve (110) are fixedly connected to the fourth connecting pipe (108) and the fifth connecting pipe (109), respectively; and the last group of valve ports of the second three-way valve (110) is fixedly connected to an oil and gas joint (111); The switching mechanism (200) comprises a mounting column (201) arranged in a housing (102), the mounting column (201) being fixedly connected to the end of a valve stem of a first three-way valve (103), the side wall of the mounting column (201) being fixedly connected to a connecting rod (202), the top of the side wall of the connecting rod (202) being fixedly connected to a push-pull column (203), the top inner wall of the housing (102) being fixedly connected to a fixing column (204), a tension spring (205) being arranged between the fixing column (204) and the push-pull column (203), and the two ends of the tension spring (205) being respectively hooked A push-pull column (203) and a fixed column (204) are hung, and the top inner wall of the shell (102) is also fixedly connected to a limit column (206), and the connecting rod (202) is located between the two groups of limit columns (206), and the angle formed by the two groups of limit columns (206) and the installation column (201) is 90°. A movable slat (208) is also slidably arranged in the shell (102), and the movable slat (208) is located below the tension spring (205). The movable slat (208) is provided with a sliding groove along the length direction, and the push-pull column (203) is inserted into the sliding groove; The gas storage mechanism (300) comprises a sliding strip (301) slidably arranged in a recovery bin (101), an air bag (303) being arranged between the sliding strip (301) and the inner wall of the recovery bin (101) close to the shell (102), the two sides of the air bag (303) being respectively fixedly connected to the inner wall of the recovery bin (101) and the sliding strip (301), the two sides of the air bag (303) being open, the first connecting pipe (105) being located opposite to the air bag (303) and being connected to the air bag (303), the inner side of the air bag (303) being provided with a push-pull cylinder (304), the push-pull cylinder (304) 04) is fixedly connected to the sliding slat (301) and is horizontally arranged, the push-pull cylinder (304) is matched with a push-pull rod (305), the push-pull rod (305) horizontally penetrates the recovery bin (101), the shell (102) and the push-pull cylinder (304) and is slidably connected to the recovery bin (101), the shell (102) and the push-pull cylinder (304), and a slider (306) is also slidably connected in the push-pull cylinder (304), the slider (306) is fixedly connected to the end of the push-pull rod (305), and the end of the push-pull rod (305) away from the slider (306) is fixedly connected to the movable slat (208); Wherein, the tension spring (205) is located below the mounting column (201) and two groups of limiting columns (206), and the distances between the two groups of limiting columns (206) and the fixed column (204) are equal. When the connecting rod (202) is in contact with a group of limiting columns (206) far away from the recovery bin (101), the vacuum pump (104) is connected to the first connecting pipe (105), and at this time, the airbag (303) is in a relaxed state. When the connecting rod (202) is in contact with another group of limiting columns (206), the vacuum pump (104) is connected to the second connecting pipe (106), and at this time, the airbag (303) is in an inflated state, and the second connecting pipe (106) is externally connected to an oil and gas condensation recovery device.

2. The exhaust gas recovery device for tank truck loading according to claim 1, characterized in that: The main body (100) further comprises two groups of support rods (112), and the two groups of support rods (112) are both fixedly connected to a side of the bottom of the shell (102) away from the recovery bin (101) and are symmetrically arranged.

3. The exhaust gas recovery device for tank truck loading according to claim 1, characterized in that: Two groups of parallel sliding bars (207) are arranged in the shell (102), and both ends of the two groups of sliding bars (207) are fixedly connected to the inner walls of the shell (102) on both sides. The movable strips (208) are provided with through holes at the positions opposite to the two groups of sliding bars (207), and the two groups of sliding bars (207) pass through the two groups of through holes respectively. The movable strips (208) are slidably arranged in the shell (102) by cooperating with the two groups of sliding bars (207).

4. The exhaust gas recovery device for tank truck loading according to claim 1, characterized in that: The sliding slats (301) are provided with openings at four corners, and the four groups of openings are matched with mounting rods (302). The two ends of the four groups of mounting rods (302) are respectively fixedly connected to the inner walls of the recovery bin (101) on both sides, and the sliding slats (301) are slidably arranged in the recovery bin (101) by matching with the four groups of mounting rods (302).

5. The exhaust gas recovery device for tank truck loading according to claim 1, characterized in that: The airbag (303) is made of rubber material, and the airbag (303) is provided with a plurality of groups of annular folds at equal intervals along the length direction.

6. The exhaust gas recovery device for tank truck loading according to claim 1, characterized in that: The fourth connecting pipe (108) and the fifth connecting pipe (109) are both hoses, and the recovery bin (101) is made of stainless steel.

7. The exhaust gas recovery device for tank truck loading according to claim 1, characterized in that: The installation column (201), the connecting rod (202), the push-pull column (203), the fixed column (204), the limit column (206) and the movable plate (208) are all made of stainless steel material, and the push-pull column (203), the fixed column (204) and the movable plate (208) have smooth surfaces.

8. The exhaust gas recovery device for tank truck loading according to claim 2, characterized in that: The bottoms of the two groups of support rods (112) are flush with the bottom of the recovery bin (101), and the two groups of support rods (112) are both made of stainless steel.

9. The exhaust gas recovery device for tank truck loading according to claim 1, characterized in that: The installation column (201) is arranged to coincide with the valve stem axis of the first three-way valve (103); the length of the tension spring (205) when the extension amount is zero is smaller than the distance between the push-pull column (203) and the fixed column (204).

10. A method for using an exhaust gas recovery device for tank truck loading, using the recovery device as claimed in any one of claims 1 to 9, characterized in that: The specific steps include: S1, initial state, the air bag (303) is relaxed, the air pump (104) is connected to the first connecting pipe (105) and the third connecting pipe (107), the second three-way valve (110) is rotated to connect the second three-way valve (110) to the fourth connecting pipe (108), and the oil and gas joint (111) is connected to the oil and gas recovery interface of the tank truck; S2, at the initial stage of loading, the oil and gas concentration in the tank truck is relatively low. At this time, the low-concentration oil and gas sequentially passes through the oil and gas joint (111), the second three-way valve (110), the fourth connecting pipe (108), the vacuum pump (104), the first three-way valve (103), the third connecting pipe (107), and the first connecting pipe (105) before entering the air bag (303). The air bag (303) gradually swells, and the sliding slats (301) drive the air bag (303) to move downward in a direction away from the shell (102). The sliding slats (301) drive the push-pull cylinder (304) to move synchronously. After moving for a period of time, the slider (306) abuts against the inner wall of the push-pull cylinder (304) close to the shell (102). At this time, after a period of perfusion, the oil and gas concentration in the tank truck gradually increases. The sliding slats (301) continue to drive the push-pull cylinder (304) to move. The push-pull cylinder (304) The push-pull rod (305) is pulled by the slider (306), and the push-pull rod (305) pulls the movable slat (208). When the movable slat (208) moves, the connecting rod (202) is pulled by the push-pull column (203), and the connecting rod (202) rotates. When the connecting rod (202) rotates more than 45 degrees, the tension of the tension spring (205) pulls the push-pull column (203), so that the connecting rod (202) quickly rotates to abut against a group of limit columns (206) close to the recovery bin (101). At this time, the first three-way valve (103) is connected with the vacuum pump (104) and the second connecting pipe (106), and the high-concentration oil and gas are successively input into the oil and gas condensation recovery equipment through the oil and gas joint (111), the second three-way valve (110), the fourth connecting pipe (108), the vacuum pump (104), the first three-way valve (103), and the second connecting pipe (106); S3, after loading is completed, the second three-way valve (110) is turned to connect the fourth connecting pipe (108) with the fifth connecting pipe (109). At this time, the low-concentration oil and gas in the air bag (303) is sequentially passed through the first connecting pipe (105), the third connecting pipe (107), the fifth connecting pipe (109), the second three-way valve (110), the fourth connecting pipe (108), the air pump (104), the first three-way valve (103), the second connecting pipe (106), and then input into the oil and gas condensation recovery equipment. The high-concentration oil and gas in the communication pipe (108), the vacuum pump (104), the first three-way valve (103) and the second communication pipe (106) are replaced by low-concentration oil and gas. During the release of the low-concentration oil and gas in the airbag (303), the airbag (303) gradually relaxes, driving the sliding strip (301) to move toward one side of the housing (102). The sliding strip (301) drives the push-pull cylinder (304) to move synchronously. After moving for a period of time, the inner wall of the push-pull cylinder (304) close to the sliding strip (301) presses against the sliding strip. When the push-pull cylinder (304) continues to move, the push-pull rod (305) is pushed to move synchronously through the slider (306), the push-pull rod (305) pushes the movable slat (208) to move, and the movable slat (208) drives the connecting rod (202) to rotate through the push-pull column (203). When the connecting rod (202) rotates more than 45°, under the tension of the tension spring (205), the connecting rod (202) quickly rotates to a set of limit columns (206) far away from the recovery bin (101). The first three-way valve (103) is connected to the vacuum pump (104) and the third connecting pipe (107), the device is reset, the second three-way valve (110) is rotated, the oil and gas joint (111) is connected to the fourth connecting pipe (108), the connection between the oil and gas joint (111) and the tank truck is disconnected, and the vacuum pump (104) sends the low-concentration oil and gas in the fourth connecting pipe (108), the second three-way valve (110), the oil and gas joint (111) and the second connecting pipe (106) to the recovery equipment to complete the recovery.

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