NMP tank car unloading system

Abstract

The utility model discloses an NMP tank car unloading system which comprises a raw material tank and a metal hose, the raw material tank is connected with an unloading pump, the unloading pump is connected with an unloading monitor, and the two ends of the metal hose are connected with the unloading monitor and a tank car. After a tank car arrives at a factory, the tank car is parked in a designated area, a metal hose is connected with a tank car discharging port, the other end of the metal hose is connected with a material barrel, NMP flows into the material barrel, an unloading pump pumps NMP and sends the NMP into a raw material tank, a liquid level sensor monitors the NMP liquid level in the material barrel, and after the NMP liquid level is lower than 50%, the liquid level sensor stops the unloading pump through a controller, the unloading pump is prevented from idling and being damaged, and unnecessary NMP unloading steps are omitted. And the NMP unloading efficiency is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to NMP conveying technical field, concretely to a kind of NMP tank car unloading system. BACKGROUND

[0002] With the development of NMP industry, the demand of NMP in each lithium battery factory increases, and NMP gradually changes from previous barrel packaging mode to tank transportation. According to the different properties of NMP, the reliability of tank unloading needs to be solved urgently.

[0003] In related art, the lithium battery factory packages and transports NMP to be transported by using HDPE barrel (IBC) 1000 liters, 200 liters of galvanized barrel and 200 liters of PE barrel. After NMP arrives at the factory, the packaging barrel containing NMP is unloaded first, then the material in the barrel is pumped to a temporary storage tank by a diaphragm pump, and NMP in the temporary storage tank is sent to a raw material tank by a transfer pump. During the whole transfer process of NMP, loading and unloading are required, and at least two material pumping steps are required, which leads to many operation steps. During the material pumping process, NMP is left, which leads to environmental pollution.

[0004] It is found by searching that the scheme of the propylene oxide tank car unloading system (publication number CN215439658U) completely introduces propylene oxide remaining in the propylene oxide tank car and propylene oxide in the pipeline into a propylene oxide storage tank by a pneumatic diaphragm pump. The operation of the diaphragm pump depends on manual control. After the propylene oxide is pumped out, the manually controlled diaphragm pump may not be immediately stopped, the diaphragm pump may be in idle running, and the service life and stability of the diaphragm pump are affected. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide an NMP tank car unloading system to solve the problems in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: an NMP tank car unloading system, comprising a raw material tank, the raw material tank is connected with an unloading pump, the unloading pump is connected with an unloading monitor;

[0007] A metal hose is connected with the unloading monitor and the tank car at both ends.

[0008] When the material level in the unloading monitor decreases by less than 50%, the unloading monitor sends a stop signal to the unloading pump to prevent the unloading pump from idling and ensure that the unloading pump is always in good working condition.

[0009] The unloading monitor comprises a barrel, a cover is installed on the upper end of the barrel through a lock, a liquid level sensor is installed on the cover, a baffle is installed on the inner wall of the cover, and the baffle is located on the right side of the liquid level sensor. The liquid level sensor monitors the liquid level in the barrel in real time and provides a signal for the stop of the unloading pump.

[0010] Further, the liquid level sensor is electrically connected with a controller, the controller is electrically connected with the unloading pump, the controller controls power-on and power-off of the unloading pump, and automatic control of the unloading pump is realized.

[0011] Further, the unloading pump is connected with a discharge port in the bottom surface of the material bucket, and a first manual valve and a flow cut-off check valve are arranged between the discharge port and the unloading pump, so that NMP diversion and leakage can be prevented.

[0012] Further, the locker comprises a connecting lug and a screw rod rotationally connected with the connecting lug, the screw rod is arranged in the notch of the cover, a nut is screwed on the screw rod, and a rotating ring is connected to the side surface of the nut, the nut is tightened to press the cover, and the sealing property between the cover and the material bucket is improved.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: after the tank car arrives at the factory, the tank car is parked in a specified area, a metal hose is connected with the unloading port of the tank car, the other end of the metal hose is connected with a material bucket, NMP flows into the material bucket, the unloading pump draws NMP and sends the NMP into a raw material tank, the liquid level sensor monitors the liquid level of NMP in the material bucket, and when the liquid level is lower than 50%, the liquid level sensor stops the unloading pump from running through the controller, so that the unloading pump is prevented from being damaged by idling, unnecessary NMP unloading steps are saved, and the NMP unloading efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic view of the utility model as a whole;

[0015] Figure 2 It is a front view of the material bucket of the utility model;

[0016] Figure 3 It is a sectional view of the material bucket of the utility model.

[0017] In the drawing: 1, raw material tank; 2, unloading pump; 3, flow cut-off check valve; 4, first manual valve; 5, controller; 6, unloading monitor; 7, second manual valve; 8, metal hose; 9, tank car; 10, material bucket; 11, cover; 12, flange; 13, threaded sleeve; 14, liquid level sensor; 15, connecting lug; 16, screw rod; 17, nut; 18, rotating ring; 19, discharge port. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0019] Embodiment:

[0020] Please refer to Figures 1-3 The utility model provides a technical scheme: a NMP tank car unloading system, including raw material jar 1, raw material jar 1 is connected with unloading pump 2, and unloading pump 2 is diaphragm pump, unloading pump 2 is connected with unloading monitor 6;

[0021] Metal hose 8, metal hose 8 both ends are connected with unloading monitor 6 and tank car 9, and the mesh cover of metal hose 8 makes metal hose 8 more stable when bearing pressure, is not easy to deform or break, has stronger bending resistance, tensile property and lateral pressure resistance, prevents NMP leakage;

[0022] When the material liquid level in unloading monitor 6 drops below 50%, unloading monitor 6 sends stop signal to unloading pump 2, to protect unloading pump 2 from damage due to idling;

[0023] The unloading monitor 6 includes a bucket 10, the upper end of the bucket 10 is provided with a cover 11 through a locker, the cover 11 is provided with a liquid level sensor 14, the liquid level sensor 14 can be used to measure the NMP liquid level of the bucket 10 by ultrasonic waves, a baffle is installed on the inner wall of the cover 11, and the baffle is located to the right of the liquid level sensor 14, NMP flows into the bucket 10 through the second manual valve 7, and the baffle can block NMP from splashing onto the liquid level sensor 14.

[0024] In the embodiment, as shown in Figure 1 The liquid level sensor 14 is electrically connected with a controller 5, the controller 5 is electrically connected with the unloading pump 2, the NMP liquid level height is monitored in real time through the liquid level sensor 14, and signals are transmitted to the controller 5, the controller 5 controls the unloading pump 2 according to the liquid level sensor 14, different manual controls the unloading pump 2, and the production efficiency is improved.

[0025] In the embodiment, as shown in Figure 1 The unloading pump 2 is connected with a discharge port 19 in the bottom surface of the bucket 10, and a first manual valve 4 and a flow cut-off check valve 3 are installed between the discharge port 19 and the unloading pump 2, the first manual valve 4 can manually limit the unloading pump 2 to extract NMP, and the flow cut-off check valve 3 can prevent NMP from flowing back into the bucket 10.

[0026] In the embodiment, as shown in Figure 2 The cover 11 is fixedly connected with a flange 12, the flange 12 is connected with the metal hose 8 through the second manual valve 7, the tight connection between the cover 11 and the metal hose 8 is ensured, and NMP leakage is prevented.

[0027] In the embodiment, as shown in Figure 2As shown, the cover 11 is fixedly connected with a threaded sleeve 13, and the liquid level sensor 14 is screwed with the threaded sleeve 13, so as to realize the sealed connection between the liquid level sensor 14 and the cover 11.

[0028] In this embodiment, as shown in Figure 2 and Figure 3 As shown, the locking device comprises a connecting lug 15 and a screw rod 16 rotatably connected with the connecting lug 15, the screw rod 16 is arranged in the notch of the cover 11, a nut 17 is screwed on the screw rod 16, and a rotating ring 18 is connected with the side of the nut 17, the rotating ring 18 is used to facilitate the rotation of the nut 17, the nut 17 is loosened and separated from the cover 11, the screw rod 16 is rotated and separated from the cover 11, and the cover 11 can be quickly removed.

[0029] Specifically, in use, after the tank car 9 carrying raw materials arrives at the factory, a designated person guides the vehicle to a designated position, an operator connects the metal hose 8 with the tank car 9, opens the first manual valve 4, and then opens the valve of the tank car 9, so that the NMP in the tank car 9 flows into the barrel 10 through the metal hose 8;

[0030] The unloading pump 2 is vented and pumped, before starting the unloading pump 2, the vent of the unloading pump 2 needs to be opened, so that the air in the unloading pump 2 can be discharged, because if there is air in the unloading pump 2, when the unloading pump 2 starts, the air will occupy the space in the unloading pump 2, so that the NMP cannot be effectively sucked and discharged, thereby affecting the discharge capacity and working efficiency of the unloading pump 2, through the venting operation, it can be ensured that there is no air remaining in the unloading pump 2, so as to prepare for the subsequent pumping operation;

[0031] After the venting is completed, NMP needs to be injected into the unloading pump 2 until the unloading pump 2 is completely filled, this step is completed by opening the second manual valve 7, the purpose of pumping is to ensure that the inside of the unloading pump 2 is filled with liquid, so that when the unloading pump 2 starts, the NMP can be effectively sucked and discharged, thereby achieving the expected discharge capacity and working efficiency;

[0032] The unloading pump 2 extracts the NMP in the barrel 10 and sends it into the raw material tank 1, the liquid level sensor 14 monitors the NMP liquid level in the barrel 10 in real time, when the NMP in the tank car 9 is taken out, the NMP liquid level in the barrel 10 drops to 50%, at this time, the liquid level sensor 14 sends a pump stop signal to the controller 5, so that the unloading pump 2 stops working, to protect the unloading pump 2 from being damaged due to idling;

[0033] Then, the valve of the tank car 9 is closed, the metal hose 8 is removed, and at the same time, the residual NMP in the metal hose 8 is flowed into the barrel 10, and then the metal hose 8 is arranged in a designated position.

[0034] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An NMP tank car unloading system, characterized by, Include: Raw material tank (1), the raw material tank (1) is connected with unloading pump (2), the unloading pump (2) is connected with unloading monitor (6); Metal hose (8), both ends of the metal hose (8) are connected with unloading monitor (6) and tank car (9); The material level in the unloading monitor (6) is lower than 50%, and the unloading monitor (6) sends a stop signal to the unloading pump (2); The unloading monitor (6) includes a bucket (10), a cover (11) is installed on the upper end of the bucket (10) through a locking device, a liquid level sensor (14) is installed on the cover (11), a baffle is installed on the inner wall of the cover (11), and the baffle is located on the right side of the liquid level sensor (14).

2. The NMP tank car unloading system of claim 1, wherein: The liquid level sensor (14) is electrically connected with a controller (5), and the controller (5) is electrically connected with the unloading pump (2).

3. The NMP tank car unloading system of claim 1, wherein: The unloading pump (2) is connected with the discharge port (19) at the bottom of the bucket (10), and a first manual valve (4) and a flow stop check valve (3) are installed between the discharge port (19) and the unloading pump (2).

4. The NMP tank car unloading system of claim 1, wherein: The cover (11) is fixedly connected with a flange (12), and the flange (12) is connected with the metal hose (8) through a second manual valve (7).

5. The NMP tank car unloading system of claim 1, wherein: The surface of the cover (11) is fixedly connected with a threaded sleeve (13), and the liquid level sensor (14) is screwed with the threaded sleeve (13).

6. The NMP tank car unloading system of claim 1, wherein: The locking device includes a connecting lug (15) and a screw rod (16) rotatably connected with the connecting lug (15), the screw rod (16) is arranged in the notch of the cover (11), a nut (17) is screwed on the screw rod (16), and a rotating ring (18) is connected on the side surface of the nut (17).

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