A structure to prevent accidental opening of a titanium dioxide slurry mixing tank

Abstract

This utility model discloses an anti-accidental opening structure for titanium dioxide slurry mixing tanks, including a screw pump, a mixed liquid inlet pipe located at the inlet end of the screw pump, a three-way valve located at the end of the mixed liquid inlet pipe, and two mixing tanks connected to the three-way valve at the outlet. Each mixing tank includes a slurry tank, an agitator mounted on the slurry tank, an EG inlet pipe and a feeding port located at the top of the slurry tank, a mixed liquid outlet pipe located between the outlet of the slurry tank and the three-way valve, and a level gauge located on one side of the slurry tank. The EG inlet pipe is equipped with an inlet switch valve, and the mixed liquid outlet pipe is equipped with an outlet switch valve. Both the inlet and outlet switch valves are equipped with a locking mechanism, which can be used to lock them. This prevents the bottom outlet switch valve from being directly opened during EG injection or agitation, thus avoiding the problem of liquid flowing out without sufficient mixing.

Description

Technical Field

[0001] This utility model relates to the technical field of titanium dioxide pulping device, specifically to a system for reminding users of the error in the inlet and outlet pipe switches of a titanium dioxide raw material reactor. Background Technology

[0002] During the production process, before the titanium dioxide raw material is fed into the grinding equipment for grinding and dispersion, it first needs to be mixed with EG in a pulping tank. After mixing, it is then transported through pipelines to a screw pump, which then transports it to the grinding equipment for grinding and dispersion. To ensure a continuous supply, the screw pump's inlet is connected to two pulping tanks. While one tank is discharging material, the other can agitate the slurry. Currently, valves are installed on the inlet and outlet pipes of each pulping tank, especially the valves on the bottom outlet pipe, which are basically adjacent to each other. When the inlet is discharging or agitating, the outlet must be closed. Discharging can only occur after agitation is complete. However, during actual discharging, operators have mistakenly opened the outlet valve incorrectly, resulting in the bottom outlet being open while the raw material is being fed in. This causes insufficiently agitated slurry to flow out directly. To avoid this situation from recurring, the existing structure needs to be improved. Summary of the Invention

[0003] In order to solve one or more technical problems existing in the prior art, the purpose of this application is to provide a structure for preventing accidental opening of a titanium dioxide slurry mixing tank, which can prevent the bottom discharge valve from being opened directly during the injection of EG or the stirring of the agitator, resulting in the liquid flowing out without being fully stirred.

[0004] To solve the aforementioned technical problems, this application adopts the following technical solution: A structure for preventing accidental opening of a titanium dioxide slurry mixing tank includes a screw pump, a mixed liquid feed pipe located at the feed end of the screw pump, a three-way valve located at the end of the mixed liquid feed pipe, and two mixing tanks whose outlets are connected to the three-way valve. The mixing tank comprises a slurry tank, a stirrer located on the slurry tank, an EG feed pipe and a feeding port located at the top of the slurry tank, a mixed liquid discharge pipe located between the slurry tank outlet and the three-way valve, and a level gauge located on one side of the slurry tank. The EG feed pipe is equipped with a feed switch valve, and the mixed liquid discharge pipe is equipped with a discharge switch valve. Both the feed switch valve and the discharge switch valve are equipped with an anti-opening mechanism, which can lock the feed switch valve and the discharge switch valve.

[0005] Preferably, the anti-opening mechanism is interlocked with the level gauge.

[0006] Preferably, the non-opening mechanism includes a position switch and an electric push rod, the electric push rod being controlled by the position switch, the position switch being used to detect the handle positions of the feed switch valve and the discharge switch valve.

[0007] Preferably, each of the slurry tanks is also equipped with an alarm on its outer side, and the agitator, level gauge and the anti-opening mechanism on each of the slurry tanks are all interlocked with the alarm.

[0008] Preferably, the alarm is an audible and visual alarm and is installed on the side close to the discharge switch valve, and the installation height of the alarm does not exceed 2 meters.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: By adding a locking mechanism, when either the feed valve of the pulping tank or the agitator is open, the discharge valve at the outlet of the pulping tank can be locked by the locking mechanism, preventing the operator from opening it. This avoids the problem of liquid flowing out before it is fully mixed when the operator at the bottom opens the bottom discharge valve during EG injection or agitation. It also avoids the problem of the operator opening the top feed valve by mistake during discharge, resulting in excessive EG injection. Attached Figure Description

[0010] Figure 1 This is a process flow diagram of the present invention; Figure 2 This is a schematic diagram of the switch valve structure equipped with a non-opening mechanism in this utility model; In the diagram: 1. Screw pump; 2. Mixed liquor feed pipe; 3. Three-way valve; 4. Mixed liquor discharge pipe; 5. Alarm; 6. Pulping tank; 61. EG feed pipe; 62. Feed switch valve; 63. Agitator; 64. Level gauge; 65. Feed port; 66. Pulp tank; 67. Discharge switch valve; 7. Restriction mechanism; 71. Position switch; 72. Electric actuator; 73. Mounting plate; 74. L-shaped support plate; 75. Protrusion. Detailed Implementation

[0011] The present application will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0012] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0013] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, without limiting the number of objects; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0014] like Figure 1 As shown, a structure for preventing accidental opening of a titanium dioxide slurry mixing tank 6 includes a screw pump 1, a mixed liquid feed pipe 2 located at the feed end of the screw pump 1, a three-way valve 3 located at the end of the mixed liquid feed pipe 2, and two mixing tanks 6 whose outlets are connected to the three-way valve 3. Each mixing tank 6 includes a slurry tank 66, an agitator 63 located on the slurry tank 66, an EG feed pipe 61 and a feeding port 65 located at the top of the slurry tank 66, a mixed liquid discharge pipe 4 located between the outlet of the slurry tank 66 and the three-way valve 3, and a level gauge 64 located on one side of the slurry tank 66. The EG feed pipe 61 is equipped with a feed switch valve 62, and the mixed liquid discharge pipe 4 is equipped with a discharge switch valve 67. Both the feed switch valve 62 and the discharge switch valve 67 are equipped with an anti-opening mechanism 7, which can lock the feed switch valve 62 and the discharge switch valve 67.

[0015] During the mixing process in the pulping tank 6, first confirm that the pulping tank 66 is empty, then open the feed valve 62 and add a certain amount of ethylene glycol required for the ingredients into the pulping tank 66 through the EG feed pipe 61. After the ethylene glycol is added, turn on the agitator 63 on the pulping tank 66 (dry running is strictly prohibited). After the agitation speed stabilizes, add the required auxiliary materials into the pulping tank 66. The addition speed should be slow to ensure uniform mixing. After the addition is complete, stir for 5 minutes. Then start feeding (record the time and production batch number of each bag of material). Use an electric hoist to lift the 500KG or 1000kg titanium dioxide raw material bag to the feeding port 65, untie the material bag rope and start feeding. The feeding speed should not be too fast. During the feeding process, observe the situation inside the tank to prevent material accumulation due to untimely mixing caused by excessive feeding speed. At the same time, closely observe whether there are any foreign objects in the material bag. If any are found, stop feeding immediately and clean the foreign objects before feeding again.

[0016] After feeding is completed (time recorded), continue stirring for 40 minutes. Then, the operator turns off the stirring and opens the discharge valve 67 at the outlet of slurry tank 66, the inlet and outlet valves of screw pump 1, and the inlet valve of the grinding equipment. Once screw pump 1 is full of slurry, it is started to transport the material to the grinding equipment for grinding. During transport, monitor the liquid level in slurry tank 6 and the outlet pressure of screw pump 1; dry running of screw pump 1 is strictly prohibited. When slurry in one slurry tank 66 is discharged, the material in the other slurry tank 66 can be continued by switching the discharge valve 67, thus ensuring an uninterrupted supply of slurry. To prevent the slurry in slurry tank 66 from being discharged due to insufficient stirring, and the operator accidentally opening the discharge valve 67, causing the material to flow out, two sets of interlocking control mechanisms 7 have been added to the existing equipment. These two sets of control mechanisms 7 are located on the feed valve 62 and discharge valve 67 of the two slurry tanks 6, respectively.

[0017] By adding the locking mechanism 7, during the entire operation, when either the feed valve 62 of the pulping tank 6 or the agitator 63 is open, the discharge valve 67 at the outlet of the pulping tank 66 is locked by the locking mechanism 7, preventing the operator from opening it, while the locking mechanism 7 on the feed valve 62 is unlocked. When both the feed valve 62 and the agitator 63 are closed, the locking mechanism 7 on the discharge valve 67 at the outlet of the pulping tank 66 is unlocked, while the locking mechanism 7 on the feed valve 62 is locked. Through the interlocking control of the locking mechanism 7, the discharge valve 67 cannot be opened when the pulping tank 66 is being mixed or stirred. This avoids the problem of liquid flowing out before sufficient mixing due to the bottom operator directly opening the bottom discharge valve 67 during EG injection or agitation by the agitator 63. It also avoids the problem of the operator mistakenly opening the top feed valve 62 during discharge, resulting in excessive EG injection.

[0018] A further improvement is that the locking mechanism 7 is interlocked with the level gauge 64.

[0019] The slurry mixing process includes the feeding stage, the mixing period, and the discharging stage. Among these, Feeding period: When the level gauge 64 detects that the liquid level is below 0.5m, the inaccessible mechanism 7 on the feed switch valve 62 is unlocked, the feed status light on the main controller is lit, and the EG liquid is continuously injected by opening the feed switch valve 62. The agitator 63 is prohibited from starting, and the discharge valve is prohibited from opening. During the mixing period: When the liquid level is greater than 1.4m, the indicator light for closing the feed valve illuminates. After the manual closing signal of the feed switch valve 62 is received, the feed status light goes out, and the start prohibition signal of the agitator 63 is closed. The manual start signal of the agitator 63 is issued, and the agitator 63 is manually started. After the agitator 63 is started, the feeding process continues, and titanium dioxide raw materials are poured in. When the liquid level is greater than 3m, the manual stop signal of the agitator 63 is issued, the inaccessible mechanism 7 on the discharge switch valve 67 is unlocked, the discharge indicator light illuminates, the inaccessible mechanism 7 on the feed switch valve 62 is locked, and after the discharge switch valve 67 is opened, the discharge signal is continuously monitored. Discharge period: When the continuous discharge liquid level is <0.3m, the indicator light of the discharge switch valve 67 will light up. After the valve closing signal of the discharge switch valve 67 is returned, the discharge inhibitor will lock, the discharge indicator light will go out, and the process will return to the feeding period.

[0020] A further improvement is made in that each of the slurry tanks 66 is also provided with an alarm 5 on its outer side. The agitator 63, level gauge 64 and the prohibition opening mechanism on each of the slurry tanks 6 are all interlocked with the alarm 5. The alarm 5 is an audible and visual alarm 5 and is installed on the side close to the discharge switch valve 67. The installation height of the alarm 5 does not exceed 2 meters.

[0021] Alarm 5 is an audible and visual alarm installed near the discharge switch. It features an alarm light and buzzer, enabling various alarm modes. Located near the discharge valve 67, it allows for easy identification of problems during valve operation, preventing incorrect opening. Even with the inoperability mechanism 7 malfunctioning, precise control is still possible via alarm 5. The alarm 5 is typically installed at a height not exceeding 2 meters for easy operator observation. When any valve signal indicates improper operation during feeding, mixing, or discharging, the corresponding alarm 5 will simultaneously activate both the indicator light and a loud alarm to alert the operator of the error. The current alarm mode is displayed on the touchscreen of the main controller, and the audible alarm further alerts the operator to any misoperation of the top EG feed pipe 61 due to the inoperability of the inoperability mechanism 7. When the agitator 63 or the EG feed pipe 61 is in the open state, the alarm light is constantly on. When the level gauge 64 detects that the liquid level is below 0.3m, the alarm light of the alarm 5 is constantly on and an alarm sound is emitted. Through different simple combinations, it not only serves to remind the operator, but also provides dual monitoring for misoperation, so that the pulping tank 6 can effectively prevent the valve from being opened incorrectly during operation.

[0022] Further improvements include, for example Figure 2 As shown, the non-opening mechanism 7 includes a position switch 71 and an electric push rod 72. The electric push rod 72 is controlled by the position switch 71, which is used to detect the handle positions of the feed switch valve 62 and the discharge switch valve 67.

[0023] Both the feed valve 62 and the discharge valve 67 are manual valves. Position switch 71 detects the closed position of the handle. When position switch 71 cannot detect the handle, it is determined to be in the open state and a signal is sent to the main controller. Position switch 71, alarm 5, and level sensor 64 are interlocked through the main controller. This interlocking control effectively monitors the open / closed status and level of each valve. In case of a problem, alarm 5 can promptly issue an alarm.

[0024] A further improvement is made by providing an L-shaped support plate 74 fixed with bolts on one side of the valve body connecting flange of the feed valve 62 and the discharge valve 67, a protrusion 75 at the end of the handle of the feed valve 62 and the discharge valve 67, and a mounting plate 73 between the two connecting flanges of the valve body of the feed valve 62 and the discharge valve 67. The position switch 71 is fixed below the protrusion 75 at the end of the handle in the closed state by the L-shaped support plate 74. The electric push rod 72 is fixed below the valve body handle by the mounting plate 73. The push rod in the extended state is higher than the horizontal plane of the handle. When in the locked state, the push rod protrudes upward, and the protrusion 75 is located directly above the position switch 71. When the position switch 71 does not detect the protrusion, it indicates that the valve body is in the open state. This facilitates the installation and fixing of the position switch 71 and the electric push rod 72, does not affect disassembly and assembly, and provides better stability after installation.

[0025] The above embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of protection of this application. Any non-substantial changes and substitutions made by those skilled in the art based on this application shall fall within the scope of protection claimed by this application.

Claims

1. A structure for preventing accidental opening of titanium dioxide slurry mixing tanks, comprising a screw pump (1), a mixed liquid feed pipe (2) disposed at the feed end of the screw pump (1), a three-way valve (3) disposed at the end of the mixed liquid feed pipe (2), and two mixing tanks (6) whose outlets are connected to the three-way valve (3), characterized in that: The pulping tank (6) includes a pulp tank (66), an agitator (63) on the pulp tank (66), an EG feed pipe (61) and a feeding port (65) on the top of the pulp tank (66), a mixed liquid discharge pipe (4) between the discharge port of the pulp tank (66) and the three-way valve (3), and a level gauge (64) on one side of the pulp tank (66). The EG feed pipe (61) is equipped with a feed switch valve (62), and the mixed liquid discharge pipe (4) is equipped with a discharge switch valve (67). Both the feed switch valve (62) and the discharge switch valve (67) are equipped with a lock-on mechanism (7), which can lock the feed switch valve (62) and the discharge switch valve (67).

2. The anti-accidental opening structure for a titanium dioxide slurry mixing tank according to claim 1, characterized in that: The lock-opening mechanism (7) is interlocked with the level gauge (64).

3. The anti-accidental opening structure for a titanium dioxide slurry mixing tank according to claim 1, characterized in that: The blocking mechanism (7) includes a position switch (71) and an electric push rod (72). The electric push rod (72) is controlled by the position switch (71), which is used to detect the handle positions of the feed valve (62) and the discharge valve (67).

4. The anti-accidental opening structure for a titanium dioxide slurry mixing tank according to claim 1, characterized in that: Each of the slurry tanks (66) is also equipped with a set of alarms (5) on the outside. The agitator (63), level gauge (64) and the prohibition opening mechanism on each of the slurry tanks (6) are all interlocked with the alarms (5).

5. The anti-accidental opening structure for a titanium dioxide slurry mixing tank according to claim 4, characterized in that: The alarm (5) is an audible and visual alarm and is installed on the side close to the discharge switch valve (67). The installation height of the alarm (5) does not exceed 2 meters.

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