Pure electrically-driven liquid nitrogen pump truck

Abstract

The invention discloses a pure electric drive liquid nitrogen pump truck, and relates to the technical field of liquid nitrogen pump trucks, the pure electric drive liquid nitrogen pump truck comprises an electric liquid nitrogen pump truck body, the electric liquid nitrogen pump truck body is driven by electric power, a buffer assembly is arranged on the electric liquid nitrogen pump truck body, the buffer assembly comprises four fixed seats which are fixedly connected, two of the four fixed seats are divided into one group, and the other group is divided into two groups. The top of each fixing seat is slidably connected with a movable block, each movable block is composed of a connecting ring and a sliding rod, the outer surface of each movable block is sleeved with a first spring, and the upper end and the lower end of each first spring are fixedly connected with the corresponding connecting ring and the corresponding fixing seat of the corresponding movable block respectively. The vibration transmitted to the movable block can be reduced through the first spring, the vibration of the electric liquid nitrogen pump truck body is prevented from being directly transmitted to the storage tank through the movable block, the connecting pipe and the fixed pipe, and then the situation that due to excessive hard vibration of the storage tank, a connecting part on the storage tank is loosened is prevented; and the problem that liquid nitrogen in the storage tank leaks due to the fact that the connecting position of the storage tank and the feeding pipe is loosened is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid nitrogen pump trucks, and in particular to a purely electrically driven liquid nitrogen pump truck. Background Art

[0002] Liquid nitrogen pump truck is a special vehicle specially used for conveying and pumping liquid nitrogen. As an ultra-low temperature liquid, liquid nitrogen is widely used in many fields such as industry, medical treatment, scientific research, etc. Liquid nitrogen pump truck can accurately convey the stored liquid nitrogen to the required place through the pumping system to meet various needs for the use of liquid nitrogen. For example, in the field of oil extraction, it is used for fracturing operations of oil wells, and the low temperature characteristics and expansion properties of liquid nitrogen are used to effectively improve the extraction efficiency of oil wells; in the medical industry, it is used for cryogenic storage and transportation of biological samples, etc. Its working principle is to drive the pumping device through the on-board power system to extract liquid nitrogen from the storage tank and pressurize it for delivery.

[0003] However, during the driving process, the liquid nitrogen pump truck will produce significant vibration due to uneven road conditions, vehicle acceleration or deceleration, and the shaking of the liquid in the liquid nitrogen storage tank. In the design of many electric liquid nitrogen pump trucks, bolts are used to install the feed pipe on the liquid nitrogen tank. The advantage of this method is that the connection is relatively firm and reliable, and it is convenient for disassembly and maintenance, as well as replacement of feed pipe components. As the liquid nitrogen pump truck travels for a long time and shakes, it is easy to cause the bolts to loosen and the connection to be loose, resulting in leakage between the liquid nitrogen storage tank and the pipeline, thereby affecting the stability and safety of the liquid nitrogen pump truck. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a purely electrically driven liquid nitrogen pump truck.

[0005] The technical solution is as follows:

[0006] A purely electrically driven liquid nitrogen pump truck comprises an electric liquid nitrogen pump truck body, the electric liquid nitrogen pump truck body is driven by electricity, and a buffer assembly is arranged on the electric liquid nitrogen pump truck body;

[0007] The buffer assembly includes four fixed seats fixedly connected to the body of the electric liquid nitrogen pump truck. The four fixed seats are divided into a group of two. The top of each fixed seat is slidably connected with a movable block. The movable block consists of a connecting ring and a sliding rod. The outer surface of the movable block is sleeved with a spring 1. The upper and lower ends of the spring 1 are respectively fixedly connected to the connecting ring of the movable block and the fixed seat.

[0008] Furthermore, a connecting pipe is fixedly connected between the two movable block connecting rings on the two fixed seats. Two connecting pipes are provided. Auxiliary pipes are fixedly connected to both ends of the two connecting pipes. A fixed pipe is fixedly connected to each of the two connecting pipes. A storage tank is fixedly connected between the two fixed pipes, and a feed pipe is provided on the outside of the storage tank.

[0009] Furthermore, a water filter assembly is provided on the outside of the storage tank, and the water filter assembly includes a feed pipe arranged on the storage tank, a water removal bin is fixedly connected to the outer surface of the feed pipe, a fixing ring is fixedly connected to the interior of the water removal bin, a coalescing water filter plate is fixedly connected to the inner surface of the fixing ring, and a water leakage bin is fixedly connected to the bottom of the fixing ring.

[0010] Furthermore, the auxiliary pipes on the two connecting pipes are connected to each other, the auxiliary pipes are connected to the storage tank, and the water removal tank is connected to the feed pipe.

[0011] Furthermore, a fastening assembly is provided on the storage tank, both ends of the storage tank are fixedly connected to a fixed cover, a transparent ring is fixedly connected to the side of the fixed cover away from the storage tank, an arc ring is fixedly connected to the inner surface of the fixed cover, a rotating ring is rotatably connected to the inner side of the arc ring, a ball is rollingly connected between the arc ring and the rotating ring, a plurality of connecting rods are fixedly connected to the side of the rotating ring away from the storage tank, a gear ring is commonly fixedly connected to one end of the plurality of connecting rods away from the rotating ring, a servo motor is fixedly connected to the outer surface of the feed pipe, a gear is fixedly connected to the output shaft of the servo motor, and the gear and the gear ring are meshed with each other.

[0012] Furthermore, the fastening assembly also includes a fixing bolt threadedly connected to one end of the feed pipe close to the storage tank, the fixing bolt fixes the feed pipe on the storage tank, the fixing bolt is an existing conventional hexagonal bolt, the outer surface of the fixing bolt is inserted with a toggle sleeve, the inner surface of the rotating ring is fixedly connected with a toggle block, and the inner wall of the fixed cover is fixedly connected with a temperature sensor.

[0013] Furthermore, a sealing assembly is provided on the rotating ring, and the sealing assembly includes a rotating frame fixedly connected to the rotating ring near the storage tank, a material storage cavity is provided inside the rotating frame, an exhaust hole is provided on the outer ring surface of the rotating frame, a movable rod is slidably connected to the rotating frame, one end of the movable rod located on the outer side of the rotating frame is fixedly connected to a resistance block, a spring three is sleeved on the outer surface of the movable rod, two ends of the spring three are respectively fixedly connected to the outer surface of the rotating frame and the resistance block, one end of the movable rod located inside the material storage cavity is fixedly connected to a pushing plate, the outer surface of the end of the movable rod located inside the material storage cavity is fixedly connected to a limiting plate one, and the inner ring surface of the fixed cover is fixedly connected to a corrugated ring, and the resistance block resists the corrugated ring.

[0014] Furthermore, the sealing assembly includes a plurality of discharge ports opened on a side of the rotating frame close to the storage tank, a one-way plate is rotatably connected to the outer surface of the rotating frame, a limiting plate 2 is fixedly connected to the outer surface of the rotating frame, and an end of the limiting plate 2 close to the one-way plate is set as an elastic metal sheet.

[0015] Furthermore, low-temperature special silica gel is stored inside the storage cavity, the exhaust hole is connected to the inside of the storage cavity, both ends of the pushing plate are set to rubber material, and the limiting plate one is in conflict with the rubber material part at both ends of the pushing plate.

[0016] As described above, the beneficial effects of a pure electric-driven liquid nitrogen pump truck in the present invention are as follows:

[0017] The vibration transmitted to the movable block can be reduced by the spring 1, and the spring can buffer and absorb the vibration by its own expansion and contraction, thereby preventing the vibration of the electric liquid nitrogen pump truck body from being directly transmitted to the storage tank through the movable block, the connecting pipe and the fixed pipe, thereby preventing the connection parts on the storage tank from loosening due to excessive rigid vibration of the storage tank, and avoiding the problem of liquid nitrogen leakage in the storage tank due to loose connection parts of the storage tank;

[0018] Since the coalescing filter plate is hydrophilic, it will only absorb the water in the liquid nitrogen. By reducing the water in the liquid nitrogen, it can prevent the water in the liquid nitrogen from freezing into solid crystals due to the extremely low temperature. Reducing the water content can reduce the solid crystals, thereby reducing the blockage of the pipeline caused by excessive solid crystals.

[0019] By further tightening the fixing bolts, the feed pipe can be firmly fixed on the storage tank again, thereby preventing the feed pipe from further loosening and causing a large amount of liquid nitrogen in the storage tank to leak out, further preventing a large amount of leaked liquid nitrogen from polluting the environment, and also preventing the leaked liquid nitrogen from causing danger to people around;

[0020] By squeezing the special low-temperature silicone into the connection between the feed pipe and the storage tank, the connection between the feed pipe and the storage tank can be sealed, effectively avoiding further leakage at the connection between the feed pipe and the storage tank, and ensuring the safety of storage in the storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a three-dimensional schematic diagram of the storage tank and its connection structure of the present invention;

[0023] Figure 3 It is a cross-sectional perspective schematic diagram of the storage tank of the present invention;

[0024] Figure 4 For the present invention Figure 3 A schematic diagram of the structure enlargement in the middle;

[0025] Figure 5 It is a three-dimensional schematic diagram of the gear, gear ring and other components of the present invention;

[0026] Figure 6 It is a three-dimensional schematic diagram of components such as a toggle block and a fixing bolt of the present invention;

[0027] Figure 7 It is a schematic diagram of the components such as the rotating frame, the corrugated ring, and the temperature detection plate of the present invention;

[0028] Figure 8 It is an enlarged schematic diagram of the structure at B in body 7 of the present invention;

[0029] Fig. 9 It is a three-dimensional schematic diagram of the two components of the present invention, namely, the abutment block, the corrugated ring, the one-way plate and the limit plate.

[0030] Among them, the accompanying drawings in the present invention are:

[0031] 1. Electric liquid nitrogen pump truck body;

[0032] Buffer assembly: 21, fixed seat; 22, movable block; 23, spring 1;

[0033] 4. Connecting pipe; 41. Fixed pipe; 42. Storage tank; 43. Auxiliary pipe; 51. Feed pipe;

[0034] Fastening components: 61, fixed cover; 62, transparent ring; 63, arc ring; 64, ball bearing; 65, rotating ring; 66, connecting rod; 67, gear ring; 68, servo motor; 69, gear; 610, fixing bolt; 611, toggle sleeve; 612, toggle block; 613, temperature sensor;

[0035] Sealing components: 71, rotating frame; 72, storage chamber; 73, exhaust hole; 74, movable rod; 75, resistance block; 76, spring three; 77, pushing plate; 78, limit plate one; 79, corrugated ring; 710, discharge port; 711, one-way plate; 712, limit plate two. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] The embodiments provided by the present invention will be described in detail below:

[0038] like Figure 1 to Figure 2 As shown, a purely electrically driven liquid nitrogen pump truck comprises an electric liquid nitrogen pump truck body 1, the electric liquid nitrogen pump truck body 1 is driven by electricity, and a buffer component for buffering vibration is arranged on the electric liquid nitrogen pump truck body 1;

[0039] The buffer assembly includes four fixed seats 21 fixedly connected to the electric liquid nitrogen pump vehicle body 1. The four fixed seats 21 are divided into two groups, and two groups are provided in total. The top of each fixed seat 21 is slidably connected to a movable block 22. The movable block 22 consists of a connecting ring and a sliding rod. The outer surface of the movable block 22 is sleeved with a spring 23. The upper and lower ends of the spring 23 are respectively fixedly connected to the connecting ring of the movable block 22 and the fixed seat 21;

[0040] A connecting pipe 4 is fixedly connected between the connecting rings of the two movable blocks 22 on the two fixed seats 21. Two connecting pipes 4 are provided. Auxiliary pipes 43 are fixedly connected to both ends of the two connecting pipes 4. The auxiliary pipes 43 on the two connecting pipes 4 are connected to each other. A fixed pipe 41 is fixedly connected to the two connecting pipes 4. A storage tank 42 is fixedly connected between the two fixed pipes 41. The auxiliary pipe 43 is connected to the storage tank 42. A feeding pipe 51 is provided on the outside of the storage tank 42.

[0041] like Figures 3 to 7 As shown, a fastening assembly for fastening the connection between the feed pipe 51 and the storage tank 42 is provided on the storage tank 42, both ends of the storage tank 42 are fixedly connected to the fixed cover 61, and a transparent ring 62 is fixedly connected to the side of the fixed cover 61 away from the storage tank 42 for convenient observation of the internal situation of the fixed cover 61, an arc ring 63 is fixedly connected to the inner surface of the fixed cover 61, and a rotating ring 65 is rotatably connected to the inner side of the arc ring 63, and a ball 64 is rollingly connected between the arc ring 63 and the rotating ring 65, and a plurality of connecting rods 66 are fixedly connected to the side of the rotating ring 65 away from the storage tank 42, and a gear ring 67 is fixedly connected to the end of the plurality of connecting rods 66 away from the rotating ring 65, and the outer surface of the feed pipe 51 is fixedly A servo motor 68 is fixedly connected to the output shaft of the servo motor 68, and a gear 69 is fixedly connected to the gear ring 67. The gear 69 is meshed with the gear ring 67. A fixing bolt 610 is threadedly installed on the end of the feed pipe 51 close to the storage tank 42. The fixing bolt 610 fixes the feed pipe 51 on the storage tank 42. The fixing bolt 610 is an existing conventional hexagonal bolt. A toggle sleeve 611 is inserted on the outer surface of the fixing bolt 610. The inner surface of the rotating ring 65 is fixedly connected with toggle blocks 612 with the same number as the fixing bolts 610. A contact plate is extended from the outer surface of the toggle sleeve 611 for contacting the toggle block 612. A temperature sensor 613 is fixedly connected to the inner wall of the fixed cover 61.

[0042] like Figures 7 to 9The cam 76 is a substantially parallelogram of the cam 76, which is a block 75 formed on the outer surface of the cam 76 and abuts against the cam 76. The cam 76 is a substantially parallelogram of the cam 76, and a substantially parallelogram of the cam 76 is a block 75 formed on the outer surface of the cam 76. The cam 76 is a substantially parallelogram of the cam 76, and a substantially parallelogram of the cam 76 is a block 75 formed on the outer surface of the cam 76. The cam 78 is smaller than the pushing plate 77 to prevent the limiting plate 78 from blocking the storage chamber 72. The limiting plate 78 contacts the rubber material parts at both ends of the pushing plate 77 to prevent the pushing plate 77 from bending toward the side close to the exhaust hole 73, so that the pushing plate 77 can only bend toward the side away from the exhaust hole 73. The inner ring surface of the fixed cover 61 is fixedly connected with a corrugated ring 79, and the contact block 75 contacts the corrugated ring 79. The rotating frame 71 is provided with a plurality of discharge holes on the side close to the storage tank 42. The one-way plate 711 is rotatably connected to the outer surface of the rotating frame 71 and corresponds to the position of the discharge outlet 710. The outer surface of the rotating frame 71 is fixedly connected to a second limiting plate 712 corresponding to the position of the one-way plate 711. An end of the second limiting plate 712 close to the one-way plate 711 is set as an elastic metal sheet for limiting the rotation of the one-way plate 711, so that after the one-way plate 711 is pushed open, it can automatically return to the blocking state of the discharge outlet 710 through the elastic metal sheet of the second limiting plate 712.

[0043] In combination with the above preferred embodiments, the following is the entire working process and working principle of the above embodiments:

[0044] The initial state is:

[0045] Spring 1 23 is not compressed by the connecting ring of the movable block 22 , and the resistance block 75 is in the depression of the corrugated ring 79 . At this time, the resistance block 75 does not compress spring 3 76 , and the elastic metal sheet of the limiting plate 2 712 makes the one-way plate 711 in a state of blocking the discharge port 710 .

[0046] The buffer assembly reduces the shock of the storage tank 42:

[0047] During the driving of the electric liquid nitrogen pump vehicle body 1, if it is driving on a bumpy road section, the electric liquid nitrogen pump vehicle body 1 will vibrate due to the bumps of the road section, and the vibration of the electric liquid nitrogen pump vehicle body 1 will be transmitted to the movable block 22 through the spring 1 23. The spring can buffer and absorb the vibration by its own expansion and contraction. The vibration transmitted to the movable block 22 can be reduced by the spring 1 23, thereby preventing the vibration of the electric liquid nitrogen pump vehicle body 1 from being directly transmitted to the storage tank 42 through the movable block 22, the connecting pipe 4 and the fixed pipe 41, thereby preventing the storage tank 42 from excessive rigid vibration causing the connecting parts on the storage tank 42 to loosen, and avoiding the problem of liquid nitrogen in the storage tank 42 leaking due to loosening of the connection between the storage tank 42 and the feed pipe 51.

[0048] The fastening assembly is used to tighten the looseness of the feed pipe 51:

[0049] When transporting liquid nitrogen for a long time, if the connection between the feed pipe 51 and the storage tank 42 by the fixing bolt 610 becomes loose, the connection between the feed pipe 51 and the storage tank 42 will become loose, and the liquid nitrogen in the storage tank 42 will leak outward, that is, leak from the connection between the feed pipe 51 and the storage tank 42, and the leaked liquid nitrogen will enter the interior of the fixed cover 61. The liquid nitrogen entering the interior of the fixed cover 61 will cause the temperature in the fixed cover 61 to drop rapidly. When the temperature sensor 613 in the fixed cover 61 detects that the temperature in the fixed cover 61 has dropped, the temperature sensor 613 controls the servo motor 68 to start through the controller. After the servo motor 68 starts, it drives the gear 69 to rotate, and the gear 69 drives the gear ring 67 to rotate. The connecting rod 66 drives the rotating ring 65 to rotate. During the rotation of the rotating ring 65, the ball 64 rotates on the inner side of the arc ring 63. At this time, the rotation of the rotating ring 65 drives the toggle block 612 to rotate synchronously. During the rotation of the toggle block 612, the contact plate extending from the outer surface of the toggle sleeve 611 is pushed. After the toggle sleeve 611 is pushed, the fixing bolt 610 is driven to rotate, so that the fixing bolt 610 is further tightened, so that the feed pipe 51 can be fixed on the storage tank 42 again, thereby preventing the feed pipe 51 from continuing to loosen and causing a large amount of liquid nitrogen in the storage tank 42 to leak out, thereby preventing a large amount of leaked liquid nitrogen from polluting the environment, and also preventing the leaked liquid nitrogen from causing danger to the surrounding personnel.

[0050] The sealing assembly seals the gap between the feed pipe 51 and the storage tank 42:

[0051] When the rotating ring 65 rotates, the rotating ring 65 will also drive the rotating frame 71 to rotate. During the rotation of the rotating frame 71, the movable rod 74 will be driven to rotate synchronously. During the rotation of the movable rod 74, the resistance block 75 will be driven to rotate synchronously. During the rotation of the resistance block 75, the resistance block 75 will be affected by the corrugated shape of the corrugated ring 79, so that the resistance block 75 drives the movable rod 74 to continuously move into the interior of the storage chamber 72. During this process, the resistance block 75 will compress the spring three 76. During the movement of the movable rod 74 into the storage chamber 72, the pushing plate 77 will be driven to move toward the middle of the storage chamber 72. During the movement of the storage chamber 72, the low-temperature special silicone in the storage chamber 72 will be squeezed. Under the limiting effect, the pushing plate 77 can effectively push the low-temperature special silicone, and the low-temperature special silicone will be discharged to the outside of the storage chamber 72 through the discharge port 710. In the process of the low-temperature special silicone being discharged outward from the discharge port 710, the one-way plate 711 will be pushed to rotate to the side away from the discharge port 710. In the process of the one-way plate 711 rotating, the elastic metal sheet of the limiting plate 2 712 will be elastically deformed, so that the low-temperature special silicone is squeezed to the connection between the feed pipe 51 and the storage tank 42. The low-temperature special silicone can be used to seal the connection between the feed pipe 51 and the storage tank 42, thereby further avoiding continued leakage at the connection between the feed pipe 51 and the storage tank 42, thereby ensuring the safety of storage in the storage tank 42.

[0052] Because the shape of the corrugated ring 79 makes the contact block 75 drive the movable rod 74 to move reciprocatingly into the storage chamber 72, and because the movable rod 74 is reciprocating, the movable rod 74 will not only move into the storage chamber 72, but also move toward the outside of the storage chamber 72. When the contact block 75 contacts the convex part of the corrugation of the corrugated ring 79, the movable rod 74 will move into the storage chamber 72, and when the contact block 75 contacts the concave part of the corrugation of the corrugated ring 79, the movable rod 74 will move out of the storage chamber 72, so that the spring three 76 compressed by the contact block 75, after the contact block 75 contacts the concave part of the corrugation of the corrugated ring 79, the elastic reset action of the spring three 76 makes the contact block 75 drive the movable rod 74 to move toward the outside of the storage chamber 72, and the movable rod 74 drives the pushing plate 77 to move upward inside the storage chamber 72, that is, Figure 8 In the process, because the pushing plate 77 is no longer restricted by the limiting plate 1 78, the pushing plate 77 will bend downward, and the air outside the storage chamber 72 will flow into the storage chamber 72 through the exhaust hole 73, so that the storage chamber 72 has enough compressed air, and the low-temperature special silica gel can be squeezed out through the sufficient compressed air. At the same time, the elastic metal sheet of the limiting plate 2 712 will make the one-way plate 711 fold downward, and the one-way plate 711 will completely block the exhaust port 710, thereby preventing the low-temperature special silica gel from being squeezed out.

[0053] It should be noted that the extrusion and no longer being extruded are both reciprocating motions, and the rotation of the rotating frame 71 is only no less than fifteen degrees.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A purely electrically driven liquid nitrogen pump truck, comprising an electric liquid nitrogen pump truck body (1), characterized in that: The electric liquid nitrogen pump truck body (1) is driven by electricity, and a buffer component is provided on the electric liquid nitrogen pump truck body (1); The buffer assembly comprises four fixed seats (21) fixedly connected to the electric liquid nitrogen pump vehicle body (1), the four fixed seats (21) are divided into a group of two, the top of each fixed seat (21) is slidably connected to a movable block (22), the movable block (22) comprises a connecting ring and a sliding rod, the outer surface of the movable block (22) is sleeved with a spring (23), and the upper and lower ends of the spring (23) are respectively fixedly connected to the connecting ring of the movable block (22) and the fixed seat (21).

2. The purely electrically driven liquid nitrogen pump truck according to claim 1, characterized in that: A connecting pipe (4) is fixedly connected between the connecting rings of the two movable blocks (22) on the two fixed seats (21), two connecting pipes (4) are provided, both ends of the two connecting pipes (4) are fixedly connected to auxiliary pipes (43), a fixed pipe (41) is fixedly connected to each of the two connecting pipes (4), a storage tank (42) is fixedly connected between the two fixed pipes (41), and a feed pipe (51) is provided on the outside of the storage tank (42).

3. The purely electrically driven liquid nitrogen pump truck according to claim 2, characterized in that: The auxiliary pipes (43) on the two connecting pipes (4) are connected to each other, the auxiliary pipe (43) is connected to the storage tank (42), and the water removal tank (52) is connected to the feed pipe (51).

4. The purely electrically driven liquid nitrogen pump truck according to claim 3, characterized in that: The storage tank (42) is provided with a fastening assembly, both ends of the storage tank (42) are fixedly connected to a fixed cover (61), a transparent ring (62) is fixedly connected to the side of the fixed cover (61) away from the storage tank (42), an arc ring (63) is fixedly connected to the inner surface of the fixed cover (61), a rotating ring (65) is rotatably connected to the inner side of the arc ring (63), a ball (64) is rollingly connected between the arc ring (63) and the rotating ring (65), a plurality of connecting rods (66) are fixedly connected to the side of the rotating ring (65) away from the storage tank (42), a gear ring (67) is fixedly connected to one end of the plurality of connecting rods (66) away from the rotating ring (65), a servo motor (68) is fixedly connected to the outer surface of the feed pipe (51), a gear (69) is fixedly connected to the output shaft of the servo motor (68), and the gear (69) and the gear ring (67) are meshed with each other.

5. The purely electrically driven liquid nitrogen pump truck according to claim 4, characterized in that: The fastening assembly also includes a fixing bolt (610) threadedly connected to one end of the feed pipe (51) close to the storage tank (42), the fixing bolt (610) fixes the feed pipe (51) on the storage tank (42), the fixing bolt (610) is an existing conventional hexagonal bolt, the outer surface of the fixing bolt (610) is plugged with a toggle sleeve (611), the inner surface of the rotating ring (65) is fixedly connected to a toggle block (612), and the inner wall of the fixed cover (61) is fixedly connected to a temperature sensor (613).

6. The purely electrically driven liquid nitrogen pump truck according to claim 4, characterized in that: The rotating ring (65) is provided with a sealing assembly, which includes a rotating frame (71) fixedly connected to a side of the rotating ring (65) close to the storage tank (42), a material storage cavity (72) is provided inside the rotating frame (71), an exhaust hole (73) is provided on the outer ring surface of the rotating frame (71), a movable rod (74) is slidably connected to the rotating frame (71), and a resistance block (75) is fixedly connected to one end of the movable rod (74) located outside the rotating frame (71), and the outer surface of the movable rod (74) is provided with a material storage cavity (72), and an exhaust hole (73) is provided on the outer ring surface of the rotating frame (71). The face sleeve is provided with a spring three (76), the two ends of the spring three (76) are respectively fixedly connected to the outer surface of the rotating frame (71) and the abutment block (75), one end of the movable rod (74) located inside the material storage chamber (72) is fixedly connected to a pushing plate (77), the outer surface of one end of the movable rod (74) located inside the material storage chamber (72) is fixedly connected to a limiting plate one (78), the inner ring surface of the fixed cover (61) is fixedly connected to a corrugated ring (79), and the abutment block (75) abuts against the corrugated ring (79).

7. The purely electrically driven liquid nitrogen pump truck according to claim 6, characterized in that: The sealing assembly comprises a plurality of discharge ports (710) provided on a side of a rotating frame (71) close to a storage tank (42); a one-way plate (711) is rotatably connected to the outer surface of the rotating frame (71); a second limiting plate (712) is fixedly connected to the outer surface of the rotating frame (71); and an end of the second limiting plate (712) close to the one-way plate (711) is provided as an elastic metal sheet.

8. The purely electrically driven liquid nitrogen pump truck according to claim 6, characterized in that: The storage chamber (72) stores low-temperature special silica gel, the exhaust hole (73) is connected to the inside of the storage chamber (72), the two ends of the pushing plate (77) are set to rubber material, and the limiting plate (78) is in conflict with the rubber material parts at the two ends of the pushing plate (77).

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