Pressure balanced raw material storage tank

Abstract

The utility model discloses a pressure balance raw material storage tank relates to raw material storage tank pressure balance technical field, the utility model discloses a storage tank body is equipped with the breathing mouth in the top of storage tank body. The utility model discloses through the lift rod and two protective shell can make two springs change shape, and then change the pre -tightening force of the positive pressure valve disc and the negative pressure valve disc that give, thereby synchronous adjustment positive pressure valve disc and the pressure response threshold of negative pressure valve disc, the damper telescopic link can provide certain resistance simultaneously, make positive pressure valve disc and negative pressure valve disc slow moving, thereby avoid the excessive impact force that produces in the moving process and cause equipment damage, when replacing the filter screen, the block will first block the air inlet pipe or the air outlet pipe again fixed pipe, when replacing is completed, will first remove the block of fixed pipe, then remove the block of air inlet pipe or air outlet pipe, thereby effectively reduce the invasion of impurity during replacement, avoid the unfiltered gas that leads to the replacement filter screen and enters.

Description

Technical Field

[0001] This utility model relates to the field of pressure balancing technology for raw material storage tanks, and specifically to a pressure balancing raw material storage tank. Background Technology

[0002] With social development, the chemical industry has experienced rapid growth. In the process of chemical production and processing, raw materials need to be stored in storage tanks. At the same time, the pressure of raw material storage tanks will change during use. In order to avoid the risk of overpressure due to excessive pressure or the potential for negative pressure due to excessively low pressure, breather valves are installed to regulate the pressure inside the raw material storage tanks.

[0003] In existing technology, the breather valve consists of a shell, a positive pressure valve disc, a negative pressure valve disc, a valve seat, a guide rod, a filter screen, and seals. During use, the positive pressure valve disc moves upward when the internal pressure of the storage tank is too high, allowing gas to flow out from the top and releasing excess pressure. Conversely, the negative pressure valve disc moves upward when the internal pressure of the storage tank is too low, allowing external air to enter to balance the pressure. However, the filter screen needs to be replaced after prolonged use. During replacement, its mounting hole, inlet pipe, and outlet pipe remain connected to the outside. At this time, unfiltered external air can easily enter the shell and storage tank, affecting the purity of the raw materials and the movement of the positive and negative pressure valve discs. Furthermore, the sliding design of the positive and negative pressure valve discs makes it impossible to regulate the pre-tightening force and simultaneously move up and down to release the blockage and balance the pressure according to different pressure thresholds, making it inconvenient to use. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a pressure-balanced raw material storage tank. This solves the issue that when the filter screen is replaced, the mounting hole, air inlet pipe, and air outlet pipe remain connected to the outside. In this situation, unfiltered external air can easily enter the outer shell and storage tank, affecting the purity of the raw material and the movement of the positive and negative pressure valve discs. Furthermore, the sliding arrangement of the positive and negative pressure valve discs makes it impossible to regulate the pre-tightening force and simultaneously move up and down according to different pressure thresholds to release the sealing pressure, thus hindering its use.

[0005] To achieve the above objectives, this utility model employs the following technical solution: a pressure-balanced raw material storage tank, comprising a tank body, a vent at the top of the tank body, a shell mounted to the vent via a flange, two through holes on the outer wall of the shell, an inlet pipe and an outlet pipe respectively mounted on the two through holes, a circular plate mounted on the inner wall of the shell, a fixed cylinder mounted at the top of the inlet pipe, air holes at the bottom of both the circular plate and the fixed cylinder, and a positive pressure valve disc and a negative pressure valve disc disposed inside the shell. A lifting rod is movably arranged above the outer shell, and an elastic pressing mechanism is provided on the lifting rod. The elastic pressing mechanism can simultaneously change the force applied to the positive pressure valve disc and the negative pressure valve disc, so that they can move according to different air pressure requirements. Both the intake pipe and the exhaust pipe have a circular shell installed at the end furthest from the outer casing. Each of the two circular shells contains a filter screen, and each of the two circular shells has an adjustment mechanism for replacing the filter screen, while preventing gas from entering the intake pipe and the exhaust pipe during replacement.

[0006] Preferably, the elastic compression mechanism includes lifting holes opened at the top of the outer shell and the top of the circular plate. The lifting rod is slidably installed on the two lifting holes. Two lifting blocks are sleeved on the lifting rod. Protective shells are installed on the sides of the two lifting blocks. Sliding holes are opened at the bottom of the two protective shells. Guide rods are slidably installed on the two sliding holes. The positive pressure valve disc and the negative pressure valve disc are respectively installed at the bottom ends of the two guide rods. Two springs are installed at the top ends of the two guide rods. The other ends of the two springs are respectively installed on the top inner walls of the two protective shells.

[0007] Preferably, damping telescopic rods are installed on the top inner walls of both protective shells, and movable plates are installed at the ends of both damping telescopic rods. The two movable plates are respectively installed on the outer walls of the two guide rods.

[0008] Preferably, the adjusting mechanism includes a movable rod rotatably mounted on the inner wall of the bottom of the circular shell, a sealing block sleeved on the movable rod, an arc-shaped frame mounted on the side of the sealing block, two guide grooves on the top of the arc-shaped frame, a movable frame slidably mounted on the two guide grooves, a filter screen mounted on the inner wall of the movable frame, an arc-shaped hole on the top of the circular shell, a fixing tube mounted on the outer wall of the circular shell, and a limit unit provided on the movable rod.

[0009] Preferably, the limiting unit includes a slot opened at the top of the circular shell, the top end of the movable rod extends to the outside of the circular shell and is equipped with a movable plate, the top of the movable plate is provided with a movable hole, a plug rod is slidably installed on the movable hole, and magnets are installed at the bottom end of the plug rod and the bottom inner wall of the slot.

[0010] Preferably, sealing gaskets are installed on the outer wall of the sealing block, the side of the arc-shaped frame, and the side of the moving frame.

[0011] Preferably, a fixing plate is installed on the top of the outer shell, a limiting hole is opened on the side of the fixing plate, a fixing bolt is movably installed on the limiting hole, and a plurality of threaded grooves are opened on the outer wall of the lifting rod, and the end of the fixing bolt is threaded into one of the threaded grooves.

[0012] Preferably, the lifting rod is provided with a label.

[0013] The beneficial effects of this utility model are as follows: This invention uses a lifting rod and a lifting block to move two protective shells. The downward movement of the two protective shells causes deformation of two springs, thus changing their preload. This change in preload alters the force applied to the positive and negative pressure valve discs via two guide rods, thereby synchronously adjusting their pressure response thresholds. Simultaneously, the damping telescopic rod provides resistance during movement, allowing for slow movement and preventing excessive impact that could damage the equipment. When replacing the filter, the movable rod, via the sealing block, drives the arc-shaped frame and moving frame to align with the arc-shaped hole for filter replacement. The rotating sealing block first seals the inlet or outlet pipe before sealing the fixed pipe. Upon replacement, the reverse rotation resets the filter, simultaneously releasing the seal on the fixed pipe before releasing the seal on the inlet or outlet pipe. This effectively reduces the intrusion of impurities during replacement and prevents unfiltered gas from directly entering the storage tank during filter replacement. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram from a first-view perspective of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention excluding the tank body; Figure 3 This is a three-dimensional structural diagram of a partially cut-out outer shell in this utility model; Figure 4 This is a three-dimensional structural diagram showing a partial cross-section of the outer shell, protective shell, air inlet pipe, air outlet pipe, and fixing cylinder of this utility model; Figure 5 yes Figure 4 Enlarged structural diagram at point A in the middle; Figure 6 This is a three-dimensional structural diagram of a partially cut circular shell in this utility model.

[0015] Reference numerals in the attached drawings: 1. Tank body; 2. Breathing port; 3. Outer shell; 4. Round shell; 5. Lifting rod; 6. Protective shell; 7. Guide rod; 8. Positive pressure valve disc; 9. Fixed cylinder; 10. Negative pressure valve disc; 11. Spring; 12. Damping telescopic rod; 13. Fixing bolt; 14. Arc-shaped hole; 15. Movable rod; 16. Sealing block; 17. Arc-shaped frame; 18. Moving frame; 19. Insert rod; 20. Fixed pipe. Detailed Implementation

[0016] The present invention will be further described below with reference to specific embodiments. However, those skilled in the art should understand that the detailed description given here with reference to the accompanying drawings is for better explanation. The structure of the present invention may exceed the limited embodiments described herein. Some equivalent alternatives or common means will not be described in detail here, but they still fall within the protection scope of this application.

[0017] Figures 1-6 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figure 1 ~Attached Figure 6 The present invention will be further described below.

[0018] A pressure-balanced raw material storage tank includes a tank body 1. A breather 2 is located at the top of the tank body 1. An outer shell 3 is mounted to the breather 2 via a flange. Two through holes are formed on the outer wall of the outer shell 3, with an inlet pipe and an outlet pipe installed on each hole respectively. A circular plate is installed on the inner wall of the outer shell 3. A fixed cylinder 9 is installed at the top of the inlet pipe. Air holes are formed at the bottom of both the circular plate and the fixed cylinder 9. A positive pressure valve disc 8 and a negative pressure valve disc 10 are installed inside the outer shell 3. A lifting rod 5 is movably mounted on the top of the outer shell 3. An elastic compression mechanism is provided on the lifting rod 5. The elastic compression mechanism includes lifting holes opened on the top of the outer shell 3 and the top of the circular plate. The lifting rod 5 is slidably mounted on the two lifting holes. Two lifting blocks are sleeved on the lifting rod 5. Protective shells 6 are installed on the sides of the two lifting blocks. Sliding holes are opened on the bottom of the two protective shells 6. Guide rods 7 are slidably mounted on the two sliding holes. Positive pressure valve discs 8 and negative pressure valve discs 10 are respectively installed on the bottom ends of the two guide rods 7. Two springs 11 are installed on the top ends of the two guide rods 7. The other ends of the two springs 11 are respectively installed on the top inner walls of the two protective shells 6. A fixing plate is installed on the top of the outer shell 3. Limiting holes are opened on the side of the fixing plate. Fixing bolts 13 are movably mounted on the limiting holes. Multiple threaded grooves are opened on the outer wall of the lifting rod 5. The end of the fixing bolt 13 is threaded into one of the threaded grooves. Both the intake and exhaust pipes have circular shells 4 installed at their ends furthest from the outer casing 3. Each circular shell 4 contains a filter screen, and each circular shell 4 has an adjustment mechanism. The adjustment mechanism includes a movable rod 15 rotatably mounted on the inner wall of the bottom of the circular shell 4. A sealing block 16 is fitted onto the movable rod 15. An arc-shaped frame 17 is installed on the side of the sealing block 16. Two guide grooves are formed at the top of the arc-shaped frame 17, and a movable frame 18 is slidably mounted on both guide grooves. The filter screen is installed on the inner wall of the movable frame 18. The top of the shell 4 has an arc-shaped hole 14. A fixed tube 20 is installed on the outer wall of the round shell 4. A limiting unit is provided on the movable rod 15. The limiting unit includes a slot opened on the top of the round shell 4. The top of the movable rod 15 extends to the outside of the round shell 4 and is equipped with a movable plate. The top of the movable plate has a movable hole. An insert rod 19 is slidably installed on the movable hole. Magnets are installed on the bottom end of the insert rod 19 and the bottom inner wall of the slot. Specifically, the components are: breather 2, shell 3, round plate, air inlet pipe, air outlet pipe, and fixed cylinder. The positive pressure valve plate 8 and negative pressure valve plate 10 are existing structures and will not be described in detail here. The protective shell 6 is a heat-insulating protective shell. The arc-shaped frame 17 is U-shaped and contacts the inner wall of the round shell 4. The sealing block 16 is not completely circular. In use, two blocking rods can be installed on the top of the round shell 4 so that when the movable plate contacts one of the blocking rods, the movable frame 18 is aligned with the arc-shaped hole 14, or when the movable plate contacts the other blocking rod, the insert rod 19 is aligned with the slot.

[0019] With the above structure, during use, the outer shell 3 is first installed on the breather 2 via the flange, and then the raw materials are stored in the tank body 1. When the air pressure inside the tank body 1 increases or decreases, the positive pressure valve disc 8 will move upward under force or the negative pressure valve disc 10 will move upward under pressure, thereby allowing the internal gas to be discharged into the cylindrical shell 4 through the vent and the outlet pipe. Then, it is filtered by one of the filters and discharged from one of the fixed pipes 20, or enters the outer shell 3 through the inlet pipe and the vent, and then enters the tank body 1 through the breather 2 to replenish the air pressure, thereby achieving a balance of air pressure inside and outside the tank body 1 and preventing damage to the tank body 1 due to excessive or insufficient air pressure. When it is necessary to adjust the tank... When the air pressure demand within the main body 1 changes, the lifting rod 5 moves downward. This downward movement of the lifting rod 5 causes the two protective shells 6 to move downward via two lifting blocks. At this time, since the positive pressure valve disc 8 and the negative pressure valve disc 10 are respectively limited by the circular plate and the fixed cylinder 9, the downward movement of the two protective shells 6 causes the two springs 11 to deform, thereby changing the preload of the springs 11. This change in the preload of the two springs 11 changes the force on the two guide rods 7, thus adjusting the force applied to the positive pressure valve disc 8 and the negative pressure valve disc 10, thereby synchronously adjusting the pressure response threshold of the positive pressure valve disc 8 and the negative pressure valve disc 10. Once adjusted, the lifting rod 5 is fixed using the fixing bolts 13 to prevent further movement. When the filter screen needs replacing, rotating the movable rod 15 causes the sealing block 16 to rotate. This rotation, in turn, moves the moving frame 18 via the arc-shaped frame 17, which in turn moves the filter screen. During this process, the sealing block 16 first blocks the inlet or outlet pipe, and then blocks the fixed pipe 20. When the arc-shaped frame 17 aligns with the arc-shaped hole 14, the inlet or outlet pipe is disconnected from the fixed pipe 20. At this point, the moving frame 18 can be removed through the arc-shaped hole 14 for filter screen replacement. When the new moving frame 18 is inserted into the two guide slots on the arc-shaped frame 17, rotating the movable rod 15 in the opposite direction... Reverse rotation of 15 will cause the sealing block 16 to rotate in the opposite direction. The reverse rotation of the sealing block 16 will cause the moving frame 18 to move in the opposite direction through the arc frame 17. At this time, the sealing of the fixed pipe 20 will be released first, and then the sealing of the air inlet pipe and the air outlet pipe will be released. When the moving frame 18 is aligned with the air inlet pipe or the air outlet pipe again, the fixed pipe 20 and the air inlet pipe or the air outlet pipe will be connected, thereby effectively reducing the intrusion of impurities during replacement and preventing unfiltered gas from directly entering the storage tank body 1 because the air inlet pipe or the air outlet pipe is always connected to the fixed pipe 20 when replacing the filter. When the replacement is complete, insert the rod 19 into the slot and limit it with a magnet to prevent the moving rod 15 from rotating during use.

[0020] like Figure 5 As shown, damping telescopic rods 12 are installed on the top inner walls of both protective shells 6, and movable plates are installed at the ends of both damping telescopic rods 12. The two movable plates are respectively installed on the outer walls of the two guide rods 7.

[0021] In this solution, by setting the damping telescopic rod 12, when the positive pressure valve disc 8 and the negative pressure valve disc 10 move, the moving plate will move through the guide rod 7. At this time, the damping telescopic rod 12 can provide a certain resistance to the moving plate, so that the positive pressure valve disc 8 and the negative pressure valve disc 10 move slowly, thereby avoiding excessive impact force generated by the positive pressure valve disc 8 and the negative pressure valve disc 10 during the movement, which would cause equipment damage.

[0022] like Figure 6 As shown, sealing gaskets are installed on the outer wall of the sealing block 16, the side of the arc frame 17, and the side of the movable frame 18.

[0023] In this design, the sealing gasket provides a certain sealing effect, preventing gas from escaping through the gap between the outer wall of the sealing block 16 and the inner wall of the circular shell 4, the gap between the side of the arc frame 17 and the inner wall of the circular shell 4, and the gap between the side of the moving frame 18 and the inner wall of the circular shell 4 during use.

[0024] like Figure 5 As shown, a label is set on the lifting rod 5.

[0025] In this solution, by setting the marking, the preload force applied by the spring 11 to the two guide rods 7 during the downward movement of the lifting rod 5 can be accurately marked, which makes it easier for staff to observe.

[0026] In summary: When using this utility model, the outer shell 3 is first installed on the breather 2 via a flange. Then, the raw materials are stored in the tank body 1. When the air pressure inside the tank body 1 increases, it is introduced into the outer shell 3 through the breather 2. Simultaneously, the increased air pressure compresses the positive pressure valve disc 8, causing it to rise. This upward movement of the positive pressure valve disc 8 deforms one of the springs 11, simultaneously releasing the seal on the air holes on the circular plate. At this point, the gas is discharged into the circular shell 4 through the air holes and the outlet pipe on the circular plate, then filtered through a filter screen and discharged through a fixed pipe 20. This process achieves pressure balance. During this process, the negative pressure valve disc 10 is subjected to force and squeezes the fixed cylinder 9. When the air pressure inside the tank body 1 decreases, the air pressure inside the outer shell 3 drops, causing the negative pressure valve disc 10 to rise under pressure. The rise of the negative pressure valve disc 10 causes another spring 11 to deform. At the same time, the upward movement of the negative pressure valve disc 10 removes the blockage on the air hole on the fixed cylinder 9. At this time, outside air will sequentially pass through the fixed pipe 20, the round shell 4, the filter screen, the air inlet pipe, and the air hole on the fixed cylinder 9 into the outer shell 3, and then enter the tank body 1 through the breather 2 to replenish the air pressure. This achieves a balance of air pressure inside and outside the storage tank 1, preventing damage due to excessive or insufficient air pressure. When the required air pressure inside the storage tank 1 needs to be changed, the lifting rod 5 moves downward. This downward movement of the lifting rod 5 causes the two lifting blocks to move downward, which in turn causes the two protective shells 6 to move downward. At this time, because the positive pressure valve disc 8 and the negative pressure valve disc 10 are respectively limited by the circular plate and the fixed cylinder 9, the downward movement of the two protective shells 6 causes the two springs 11 to deform, thereby changing the preload of the springs 11. This change in the preload of the two springs 11 causes the two... The force on the guide rod 7 changes, thereby adjusting the force applied to the positive pressure valve disc 8 and the negative pressure valve disc 10, thus synchronously adjusting the pressure response threshold of the positive pressure valve disc 8 and the negative pressure valve disc 10. When the adjustment is complete, the lifting rod 5 is fixed by the fixing bolt 13 to prevent movement during use. At the same time, when the positive pressure valve disc 8 and the negative pressure valve disc 10 move, the damping telescopic rod 12 can provide a certain resistance, so that the positive pressure valve disc 8 and the negative pressure valve disc 10 move slowly, thereby avoiding excessive impact force during the movement of the positive pressure valve disc 8 and the negative pressure valve disc 10, which could cause equipment damage.

[0027] When the filter needs to be replaced, rotate the movable rod 15. Rotation of the movable rod 15 causes the sealing block 16 to rotate, which in turn moves the arc-shaped frame 17. The movement of the arc-shaped frame 17 then moves the moving frame 18, which in turn moves the filter. During this process, the rotating sealing block 16 first blocks the inlet or outlet pipe, and then blocks the fixed pipe 20. When the arc-shaped frame 17 aligns with the arc-shaped hole 14, the inlet or outlet pipe is disconnected from the fixed pipe 20. At this point, the moving frame 18 can be removed through the arc-shaped hole 14 for filter replacement. When the new moving frame 18 is inserted into the two guide slots on the arc-shaped frame 17, rotate the movable rod 15 in the opposite direction. The reverse rotation of the movable rod 15 will cause the sealing block 16 to rotate in the opposite direction. The reverse rotation of the sealing block 16 will cause the moving frame 18 to move in the opposite direction through the arc frame 17. At this time, the sealing of the fixed pipe 20 will be released first, and then the sealing of the air inlet pipe and the air outlet pipe will be released. When the moving frame 18 is aligned with the air inlet pipe or the air outlet pipe again, the fixed pipe 20 and the air inlet pipe or the air outlet pipe will be connected, thereby effectively reducing the intrusion of impurities during replacement and preventing unfiltered gas from directly entering the storage tank body 1 because the air inlet pipe or the air outlet pipe is always connected to the fixed pipe 20 when replacing the filter. When the replacement is complete, the insertion rod 19 is inserted into the slot and limited by the magnet, thereby preventing the movable rod 15 from rotating during use.

[0028] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A pressure-balanced raw material storage tank, comprising a tank body (1), characterized in that, The top of the storage tank body (1) is provided with a vent (2), and the vent (2) is fitted with a shell (3) through a flange. The outer wall of the shell (3) has two through holes, and an air inlet pipe and an air outlet pipe are respectively installed on the two through holes. A circular plate is installed on the inner wall of the shell (3). A fixed cylinder (9) is installed at the top of the air inlet pipe. Air holes are opened at the bottom of the circular plate and the fixed cylinder (9). A positive pressure valve disc (8) and a negative pressure valve disc (10) are provided inside the shell (3). A lifting rod (5) is movably arranged above the outer shell (3). An elastic squeezing mechanism is provided on the lifting rod (5). The elastic squeezing mechanism can simultaneously change the force applied to the positive pressure valve disc (8) and the negative pressure valve disc (10), so that they can move according to different air pressure requirements. Both the inlet pipe and the outlet pipe are equipped with a round shell (4) at the end away from the outer shell (3). Both round shells (4) are equipped with filters and adjustment mechanisms. The adjustment mechanisms are used to replace the filters and prevent gas from entering the inlet pipe and outlet pipe during replacement.

2. The pressure-balanced raw material storage tank according to claim 1, characterized in that, The elastic compression mechanism includes lifting holes opened at the top of the outer shell (3) and the top of the circular plate. The lifting rod (5) is slidably installed on the two lifting holes. Two lifting blocks are sleeved on the lifting rod (5). Protective shells (6) are installed on the sides of the two lifting blocks. Sliding holes are opened at the bottom of the two protective shells (6). Guide rods (7) are slidably installed on the two sliding holes. The positive pressure valve disc (8) and the negative pressure valve disc (10) are respectively installed at the bottom of the two guide rods (7). Two springs (11) are installed at the top of the two guide rods (7). The other ends of the two springs (11) are respectively installed on the top inner wall of the two protective shells (6).

3. The pressure-balanced raw material storage tank according to claim 2, characterized in that, The top inner walls of both protective shells (6) are equipped with damping telescopic rods (12), and the ends of both damping telescopic rods (12) are equipped with movable plates. The two movable plates are respectively installed on the outer walls of the two guide rods (7).

4. A pressure-balanced raw material storage tank according to claim 1, characterized in that, The adjustment mechanism includes a movable rod (15) rotatably mounted on the inner wall of the bottom of the circular shell (4), a sealing block (16) sleeved on the movable rod (15), an arc frame (17) mounted on the side of the sealing block (16), two guide grooves opened on the top of the arc frame (17), a movable frame (18) slidably mounted on the two guide grooves, the filter screen is mounted on the inner wall of the movable frame (18), an arc hole (14) is opened on the top of the circular shell (4), a fixed tube (20) is installed on the outer wall of the circular shell (4), and a limit unit is provided on the movable rod (15).

5. A pressure-balanced raw material storage tank according to claim 4, characterized in that, The limiting unit includes a slot opened on the top of the round shell (4), the top end of the movable rod (15) extends to the outside of the round shell (4) and is equipped with a movable plate, the top of the movable plate is provided with a movable hole, and a plug rod (19) is slidably installed on the movable hole. Magnets are installed on the bottom end of the plug rod (19) and the bottom inner wall of the slot.

6. A pressure-balanced raw material storage tank according to claim 4, characterized in that, Sealing gaskets are installed on the outer wall of the sealing block (16), the side of the arc frame (17), and the side of the moving frame (18).

7. A pressure-balanced raw material storage tank according to claim 1, characterized in that, A fixing plate is installed on the top of the outer shell (3). A limiting hole is opened on the side of the fixing plate. A fixing bolt (13) is movably installed on the limiting hole. Multiple threaded grooves are opened on the outer wall of the lifting rod (5). The end of the fixing bolt (13) is threaded into one of the threaded grooves.

8. A pressure-balanced raw material storage tank according to claim 1, characterized in that, The lifting rod (5) is equipped with a label.

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