A device for removing soy sauce precipitate

Abstract

The application discloses a device for removing soy sauce precipitate and relates to the technical field of soy sauce filtration. The device comprises a rack, a tank body is fixedly installed at the top of the rack, a tank cover is installed at the top of the tank body, a driving shaft is rotatably installed in the tank body, the driving shaft is designed to be hollow, a rotating sealing portion is arranged at the bottom of the driving shaft, a liquid discharge pipe is arranged outside the rotating sealing portion, a driving motor and an input pump are installed in the rack, the driving motor is used for driving the driving shaft, and the input pump can input soy sauce into the tank body; a plurality of ceramic membrane mounting seats are sleeved with the outside of the driving shaft, and a ceramic membrane disc is sleeved with the outside of the ceramic membrane mounting seat. Through the design of the adjustable-angle ceramic membrane disc, when filtering high-viscosity or high-concentration soy sauce, the installation ring is adjusted to a large inclination angle, which can significantly enhance the fluid disturbance and boundary layer update of the membrane surface, effectively resist the serious concentration difference polarization and rapid pollution caused by high-viscosity materials.

Description

Technical Field

[0001] This invention relates to the field of soy sauce filtration technology, and more specifically to a device for removing sediment from soy sauce. Background Technology

[0002] In recent years, cross-flow filtration technology, with ceramic membranes at its core, has been applied in the production of high-end soy sauce due to its advantages such as high filtration accuracy, good physicochemical stability, high-temperature sterilization capability, and long service life. This technology allows soy sauce to flow parallel across the surface of a ceramic membrane under pressure. Water and small-molecule flavor substances pass through the membrane pores, while large-molecule colloids, proteins, microorganisms, and particles are retained, thereby achieving clarification, sterilization, and stabilization.

[0003] Patent application CN119499881A discloses a rotating cross-flow ceramic membrane filtration device, including a housing, a main shaft unit disposed within the housing, and a power unit that drives the main shaft unit to rotate. The power unit provides rotational power to the main shaft unit, driving the filter discs to rotate. The main shaft unit is installed inside the housing to perform specific filtration tasks, while the housing provides necessary support and protection for the main shaft unit and the power unit, and controls the inflow and outflow of materials.

[0004] The aforementioned patent is similar to conventional rotary cross-flow ceramic membrane filtration equipment, which involves fixing multiple ceramic membrane filter discs on the main shaft unit. The angle of the ceramic membrane filter discs is fixed and always perpendicular to the main shaft unit. This design has poor adaptability to the viscosity of soy sauce because soy sauce (especially dark soy sauce) has a high viscosity and concentration. In cross-flow filtration, high viscosity leads to a sharp increase in the energy consumption of the circulation pump, a decrease in the efficiency of membrane shear force transmission, a poorer anti-fouling effect, increased mass transfer resistance, and a reduction in filtration efficiency. For high-viscosity soy sauce products, the techno-economic efficiency of cross-flow filtration deteriorates significantly. These problems are generally mitigated by pre-dilution or increasing the temperature, but this can lead to flavor loss or thermal damage. Summary of the Invention

[0005] To address the above problems, the present invention provides an apparatus for removing sediment from soy sauce.

[0006] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0007] An apparatus for removing sediment from soy sauce includes a frame, a tank fixedly mounted on the top of the frame, a tank cover mounted on the top of the tank, a drive shaft rotatably mounted inside the tank, the drive shaft being hollow, a rotary sealing part being provided at the bottom of the drive shaft, a drain pipe being provided on the outside of the rotary sealing part, and a drive motor and an input pump being installed inside the frame. The drive motor is used to drive the drive shaft, and the input pump can input soy sauce into the tank.

[0008] Several ceramic membrane mounting seats are sleeved on the outside of the drive shaft, and ceramic membrane discs are sleeved on the outside of the ceramic membrane mounting seats. An inner shaft is provided inside the ceramic membrane mounting seat and passes through the drive shaft. An adjusting shaft is rotatably installed inside the drive shaft. When the adjusting shaft rotates, it can drive the inner shaft to rotate. A liquid storage chamber is opened inside the ceramic membrane mounting seat and is connected to the ceramic membrane disc. The adjusting shaft is hollow and is connected to the liquid storage chamber. Several drainage holes are opened at the bottom of the adjusting shaft.

[0009] Furthermore, the rotary sealing part includes a rotary sealing cavity opened at the bottom end of the drive shaft, and a rotary sealing ring is rotatably installed inside the rotary sealing cavity, and a drain pipe is arranged on the rotary sealing ring.

[0010] Furthermore, a shaft cover is threadedly connected to the top of the drive shaft, and an adjusting hydraulic cylinder is fixedly installed at the bottom of the shaft cover. A drive sleeve is provided at the bottom of the telescopic end of the adjusting hydraulic cylinder. A drive part is provided at the top of the adjusting shaft. A spiral drive groove is opened on the outer surface of the drive part. A drive protrusion is provided on the inner wall of the drive sleeve. The drive protrusion is inserted into the spiral drive groove. A rotary sealing joint is provided at the top of the shaft cover. The adjusting hydraulic cylinder pipeline is connected to an external pipeline through the rotary sealing joint.

[0011] Furthermore, the drive shaft drives the inner shaft to rotate via a worm gear structure.

[0012] Furthermore, the outer surface of the ceramic membrane mounting base is provided with a connecting ring groove, the ceramic membrane disc is sleeved on the outside of the connecting ring groove, and the inner wall of the connecting ring groove is provided with a plurality of liquid inlet holes, which connect the connecting ring groove and the liquid storage chamber.

[0013] Furthermore, sealing pressure rings are fixedly installed on both the upper and lower surfaces of the connecting ring groove. The ceramic membrane mounting base has two sets of transmission holes through it, located above and below the connecting ring groove respectively. Each set of transmission holes consists of several guide holes arranged in a ring. A sealing clamp rod is slidably connected inside the guide hole. The sealing clamp rod is connected to the drive shaft through a winding rope. When the winding rope is loosened, the sealing clamp rod extends out of the guide hole. When the sealing clamp rods above and below the connecting ring groove extend, they can clamp the sealing pressure ring and the ceramic membrane disc in the middle.

[0014] Furthermore, the sealing clamp rod is U-shaped, with two sets of swing rods hinged to both ends of the sealing clamp rod. An elastic pressure rod is provided between the two sets of swing rods at the same end, and a pressure head is provided at both ends of the sealing clamp rod, with the elastic pressure rod located inside the pressure head.

[0015] Furthermore, the outer side of the drive shaft is provided with a shaft hole and a rope hole, and a sliding sealing sleeve is provided inside both the shaft hole and the rope hole. The inner shaft rod passes through the shaft hole, and the rope passes through the rope hole.

[0016] Furthermore, a pressure relief valve is provided on the outside of the tank, and a pressure gauge is installed on the pressure relief valve.

[0017] Furthermore, the can lid is fixedly installed on the can body by locking bolts.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. This invention, through the design of an adjustable-angle ceramic membrane disc, allows the installation ring to be adjusted to a larger tilt angle when filtering high-viscosity or high-concentration soy sauce. At this time, gravity generates a component force along the membrane tube direction, which couples with the rotational shear force to form a "spiral propulsion" or "enhanced secondary flow" effect. This can significantly enhance the fluid disturbance and boundary layer renewal on the membrane surface, effectively combating the severe concentration polarization and rapid fouling caused by high-viscosity materials.

[0020] 2. This invention, through the setting of the ceramic membrane mounting base, can adjust the angle while the drive shaft rotates. When filtering soy sauce, it is divided into three stages: the coarse filtration stage, which adopts a 30° tilt angle, and the higher tangential gravity component helps to "wash" the membrane surface, which is suitable for processing soy sauce with high initial viscosity and high solid content; the fine filtration stage, which switches to 0° horizontally to obtain a stable and uniform flow field for fine filtration with low energy consumption; and the final cleaning and emptying stage, which adopts a -5° tilt angle to facilitate the thorough drainage of concentrate and cleaning agent. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic cross-sectional view of the overall structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the drive shaft structure of the present invention;

[0024] Figure 4 This is a schematic cross-sectional view of the drive shaft structure of the present invention;

[0025] Figure 5 This is a schematic diagram of the shaft cover structure of the present invention;

[0026] Figure 6 This is a schematic diagram of the ceramic membrane mounting base structure of the present invention;

[0027] Figure 7 This is a schematic diagram of the internal structure of the ceramic film disk of the present invention;

[0028] Figure 8 This is a cross-sectional view of the ceramic membrane mounting base of the present invention;

[0029] Figure 9 This is a schematic diagram of the sealing clamp structure of the present invention.

[0030] Reference numerals: 1. Frame; 2. Input pump; 3. Drive motor; 4. Tank body; 401. Pressure relief valve; 5. Tank cover; 501. Locking bolt; 6. Drive shaft; 601. Adjusting shaft; 602. Rotary sealing cavity; 603. Rotary sealing ring; 604. Drain pipe; 605. Drive unit; 7. Shaft cover; 701. Adjusting hydraulic cylinder; 702. Drive sleeve; 703. Rotary sealing joint; 8. Ceramic diaphragm mounting base; 801. Inner shaft; 802. Sealing pressure ring; 803. Guide hole; 804. Liquid storage cavity; 805. Liquid inlet; 806. Connecting ring groove; 807. Drain hole; 9. Ceramic diaphragm disc; 10. Sealing clamp rod; 101. Pressure head; 102. Swing rod; 103. Elastic pressure rod; 104. Winding rope. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] Example 1, as Figures 1-9 As shown, an apparatus for removing sediment from soy sauce includes a frame 1, a tank 4 fixedly mounted on the top of the frame 1, a tank cover 5 mounted on the top of the tank 4, a drive shaft 6 rotatably mounted inside the tank 4, the drive shaft 6 having a hollow design, a rotary sealing part provided at the bottom of the drive shaft 6, and a drain pipe 604 provided on the outside of the rotary sealing part. A drive motor 3 and an input pump 2 are installed inside the frame 1. The drive motor 3 is used to drive the drive shaft 6, and the input pump 2 can input soy sauce into the tank 4.

[0033] Several ceramic membrane mounting seats 8 are sleeved on the outside of the drive shaft 6, and ceramic membrane discs 9 are sleeved on the outside of the ceramic membrane mounting seats 8. An inner shaft rod 801 is provided inside the ceramic membrane mounting seat 8, and the inner shaft rod 801 passes through the drive shaft 6. An adjusting shaft 601 is rotatably installed inside the drive shaft 6. When the adjusting shaft 601 rotates, it can drive the inner shaft rod 801 to rotate. A liquid storage chamber 804 is opened inside the ceramic membrane mounting seat 8, and the liquid storage chamber 804 is connected to the ceramic membrane disc 9. The adjusting shaft 601 is hollow and connected to the liquid storage chamber 804. Several drainage holes 807 are opened at the bottom of the adjusting shaft 601.

[0034] Preferably, the rotary sealing part includes a rotary sealing cavity 602 opened at the bottom end of the drive shaft 6, and a rotary sealing ring 603 is rotatably installed inside the rotary sealing cavity 602, and a drain pipe 604 is disposed on the rotary sealing ring 603.

[0035] Preferably, a shaft cover 7 is threadedly connected to the top of the drive shaft 6, and an adjusting hydraulic cylinder 701 is fixedly installed at the bottom of the shaft cover 7. A drive sleeve 702 is provided at the bottom of the telescopic end of the adjusting hydraulic cylinder 701. A drive part 605 is provided at the top of the adjusting shaft 601. A spiral drive groove is opened on the outer surface of the drive part 605. A drive protrusion is provided on the inner wall of the drive sleeve 702. The drive protrusion is inserted into the spiral drive groove. A rotary sealing joint 703 is provided at the top of the shaft cover 7. The pipeline of the adjusting hydraulic cylinder 701 is connected to the external pipeline through the rotary sealing joint 703.

[0036] Preferably, the drive shaft 6 drives the inner shaft 801 to rotate through a worm gear structure. The worm gear unidirectional transmission structure ensures that the ceramic membrane mounting base 8 has a fixed angle and stable stirring during rotation.

[0037] Preferably, a pressure relief valve 401 is provided on the outside of the tank body 4, and a pressure gauge is provided on the pressure relief valve 401. After the soy sauce is poured in, the pressure above the tank body 4 increases. By observing the pressure gauge, the pressure relief valve 401 is opened to adjust the pressure in the tank body 4 to a suitable filtration pressure.

[0038] Preferably, the can lid 5 is fixedly installed on the can body 4 by locking bolts 501. This design allows for quick assembly and disassembly of the can lid 5.

[0039] Straining steps for concentrated soy sauce:

[0040] 1. Liquid injection: Soy sauce is injected into tank 4 from below using input pump 2. A fixed amount is injected each time. After the specified amount is injected, the gas in tank 4 is pushed to the top of the liquid surface. The liquid level does not exceed the pressure relief valve 401. Then, by observing the pressure gauge, the pressure relief valve 401 is opened to adjust the pressure in tank 4 to a suitable filtration pressure.

[0041] 2. Filtration: When the equipment starts, the drive motor 3 drives the drive shaft 6 to rotate. The drive shaft 6 drives the ceramic membrane disc 9 to rotate at high speed through the ceramic membrane mounting seat 8. The filtered soy sauce enters the liquid storage chamber 804 through the ceramic membrane disc 9 and then enters the inner shaft rod 801. It then enters the drive shaft 6 through the drain hole 807 and is discharged through the rotary sealing chamber 602 and the drain pipe 604. During the filtration process, the equipment does not stop. The control and adjustment hydraulic cylinder 701 is operated. The adjustment hydraulic cylinder 701 drives the drive sleeve 702 to descend. The drive sleeve 702 converts the linear drive into the rotation drive of the adjustment shaft 601 through the drive protrusion and the spiral drive groove. The adjustment shaft 601 drives all the inner shaft rods 801 to rotate simultaneously through the worm gear structure. All the ceramic membrane mounting seats 8 drive the ceramic membrane disc 9 to adjust the tilt angle. It is mainly divided into three stages: (1) Coarse filtration stage, using a 30° tilt angle, the higher tangential gravity component helps to "wash" the membrane surface, which is suitable for processing soy sauce with high initial viscosity and high solid content; (2) Fine filtration stage, switching to 0° level to obtain a stable and uniform flow field, and performing fine filtration with low energy consumption; (3) Cleaning: loosen the locking bolt 501, open the tank cover 5, adjust the ceramic membrane plate 9 to a -5° tilt angle, so as to thoroughly drain the concentrate and cleaning agent on the ceramic membrane plate 9, and then discharge the concentrate and cleaning agent from the drain port at the bottom of the tank 4.

[0042] In the second embodiment, a connecting ring groove 806 is provided on the outer surface of the ceramic membrane mounting base 8, and the ceramic membrane disk 9 is sleeved on the outside of the connecting ring groove 806. A plurality of liquid inlet holes 805 are provided in a ring on the inner wall of the connecting ring groove 806, and the liquid inlet holes 805 connect the connecting ring groove 806 and the liquid storage chamber 804.

[0043] Preferably, sealing rings 802 are fixedly installed on both the upper and lower surfaces of the connecting ring groove 806. The ceramic membrane mounting base 8 has two sets of transmission holes, which are located above and below the connecting ring groove 806, respectively. Each set of transmission holes consists of several guide holes 803 arranged in a ring. A sealing clamping rod 10 is slidably connected inside the guide hole 803. The sealing clamping rod 10 is connected to the drive shaft 6 through a winding rope 104. When the winding rope 104 is loosened, the sealing clamping rod 10 extends out of the guide hole 803. When the sealing clamping rods 10 above and below the connecting ring groove 806 extend, they can clamp the sealing ring 802 and the ceramic membrane disc 9 in the middle. By setting the connecting ring groove 806, the drain port of the ceramic membrane disc 9 does not need to correspond to the liquid inlet 805. During installation, the ceramic membrane disc 9 only needs to be sleeved on the outside of the connecting ring groove 806, which is convenient for installation.

[0044] Preferably, the sealing clamp rod 10 is U-shaped, and two sets of swing rods 102 are hinged to both ends of the sealing clamp rod 10. An elastic pressure rod 103 is provided between the two sets of swing rods 102 at the same end. A pressure head 101 is provided at both ends of the sealing clamp rod 10, and the elastic pressure rod 103 is located inside the pressure head 101.

[0045] Preferably, the drive shaft 6 has a shaft hole and a rope hole through it on the outside. The shaft hole and the rope hole are both provided with sliding sealing sleeves. The inner shaft rod 801 passes through the shaft hole and the winding rope 104 passes through the rope hole, thereby improving the overall sealing performance of the drive shaft 6.

[0046] In the background art, the installation method for the ceramic diaphragm discs 9 is generally to fix each disc individually with screws. Since there are many ceramic diaphragm discs 9, this method has extremely low replacement efficiency. Therefore, this embodiment provides a method for quickly replacing the ceramic diaphragm discs 9. The specific operation steps are as follows:

[0047] By controlling the operation of the regulating hydraulic cylinder 701, the regulating hydraulic cylinder 701 drives the drive sleeve 702 to descend. The drive sleeve 702 converts the linear drive into the rotational drive of the regulating shaft 601 through the drive protrusion and the spiral drive groove. The regulating shaft 601 drives all the inner shafts 801 to rotate simultaneously through the worm gear structure. All the ceramic diaphragm mounting seats 8 drive the ceramic diaphragm discs 9 to adjust their tilt angle until the tilt angle of the ceramic diaphragm discs 9 reaches -30°. During this process, the regulating shaft 601 winds up the rope 104, and the rope 104 drives the sealing clamp rod 10 to guide the guide hole 80. 3. Internal sliding: Under the guidance of the inner wall of the guide hole 803, the swing rod 102 closes. When the swing rod 102 closes, the elastic pressure rod 103 bends and retracts below the pressure head 101 until the sealing clamp rod 10 disengages from the ceramic diaphragm plate 9. It should be noted that when the sealing clamp rod 10 disengages from the ceramic diaphragm plate 9, the swing rod 102 is not completely retracted in the guide hole 803. At this time, the ceramic diaphragm plate 9 is rotated to a horizontal position. The contact position between the ceramic diaphragm plate 9 and the inclined ceramic diaphragm mounting seat 8 is only two points, which can easily remove the ceramic diaphragm plate 9 from the ceramic diaphragm mounting seat 8, resulting in high disassembly efficiency.

[0048] During installation, the new ceramic diaphragm disc 9 is sequentially fitted onto the ceramic diaphragm mounting base 8 and rotated to -30° to align with the position of the connecting ring groove 806. The friction between the ceramic diaphragm disc 9 and the connecting ring groove 806 must be greater than the weight of the ceramic diaphragm disc 9. Then, the adjusting shaft 601 is reversed, and the adjusting shaft 601 loosens the winding rope 104. Since the sealing clamp rod 10 is not under tension and the swing rod 102 is not fully retracted in the guide hole 803, the two sets of swing rods 102 unfold under the elastic force of the elastic pressure rod 103. The swing rods 102 on adjacent sealing clamp rods 10 touch each other and cooperate with the elastic pressure rod 103 to form a continuous pressure ring. Due to the setting of the pressure head 101, the elastic pressure rod 103 will not bend upward and can tightly press the sealing pressure ring 802. Therefore, the sealing clamp rod 10 can tightly clamp the sealing pressure ring 802 and the ceramic diaphragm disc 9, achieving one-time quick sealing installation.

[0049] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for removing sediment from soy sauce, comprising a frame (1), characterized in that, The top of the frame (1) is fixedly installed with a tank (4), the top of the tank (4) is installed with a tank cover (5), the inside of the tank (4) is rotatably installed with a drive shaft (6), the drive shaft (6) is hollow, the bottom of the drive shaft (6) is provided with a rotary sealing part, the outside of the rotary sealing part is provided with a drain pipe (604), the inside of the frame (1) is installed with a drive motor (3) and an input pump (2), the drive motor (3) is used to drive the drive shaft (6), and the input pump (2) can input soy sauce into the tank (4); A plurality of ceramic membrane mounting seats (8) are sleeved on the outside of the drive shaft (6), and a ceramic membrane disk (9) is sleeved on the outside of the ceramic membrane mounting seat (8). An inner shaft (801) is provided inside the ceramic membrane mounting seat (8), and the inner shaft (801) passes through the drive shaft (6). An adjusting shaft (601) is rotatably installed inside the drive shaft (6). When the adjusting shaft (601) rotates, it can drive the inner shaft (801) to rotate. A liquid storage chamber (804) is opened inside the ceramic membrane mounting seat (8), and the liquid storage chamber (804) is connected to the ceramic membrane disk (9). The adjusting shaft (601) is hollow and is connected to the liquid storage chamber (804). A plurality of drain holes (807) are opened at the bottom of the adjusting shaft (601). The outer surface of the ceramic membrane mounting base (8) is provided with a connecting ring groove (806). The ceramic membrane disc (9) is sleeved on the outside of the connecting ring groove (806). The inner wall of the connecting ring groove (806) is provided with a plurality of liquid inlet holes (805). The liquid inlet holes (805) connect the connecting ring groove (806) and the liquid storage chamber (804). The upper and lower surfaces of the connecting ring groove (806) are fixedly installed with sealing pressure rings (802). The ceramic membrane mounting base (8) is provided with two sets of transmission holes. The two sets of transmission holes are respectively located at Above and below the connecting ring groove (806), each set of transmission holes is composed of several guide holes (803) distributed in a ring. A sealing clamp rod (10) is slidably connected inside the guide hole (803). The sealing clamp rod (10) is connected to the drive shaft (6) through a winding rope (104). When the winding rope (104) is loosened, the sealing clamp rod (10) extends out of the guide hole (803). When the sealing clamp rods (10) above and below the connecting ring groove (806) extend, they can clamp the sealing pressure ring (802) and the ceramic diaphragm plate (9) in the middle. The top of the drive shaft (6) is threaded with a shaft cover (7), and the bottom of the shaft cover (7) is fixedly installed with an adjusting hydraulic cylinder (701). The bottom of the telescopic end of the adjusting hydraulic cylinder (701) is provided with a drive sleeve (702). The top of the adjusting shaft (601) is provided with a drive part (605). The outer surface of the drive part (605) is provided with a spiral drive groove. The inner wall of the drive sleeve (702) is provided with a drive protrusion. The drive protrusion is inserted into the spiral drive groove. The top of the shaft cover (7) is provided with a rotary sealing joint (703). The pipeline of the adjusting hydraulic cylinder (701) is connected to the external pipeline through the rotary sealing joint (703).

2. The apparatus for removing soy sauce sediment according to claim 1, characterized in that, The rotary sealing part includes a rotary sealing cavity (602) opened at the bottom end of the drive shaft (6), and a rotary sealing ring (603) is rotatably installed inside the rotary sealing cavity (602), and a drain pipe (604) is provided on the rotary sealing ring (603).

3. The apparatus for removing soy sauce sediment according to claim 2, characterized in that, The drive shaft (6) drives the inner shaft (801) to rotate through a worm gear structure.

4. The apparatus for removing soy sauce sediment according to claim 3, characterized in that, The sealing clamp (10) is U-shaped. Two sets of swing rods (102) are hinged to both ends of the sealing clamp (10). An elastic pressure rod (103) is provided between the two sets of swing rods (102) at the same end. A pressure head (101) is provided at both ends of the sealing clamp (10). The elastic pressure rod (103) is located inside the pressure head (101).

5. The apparatus for removing soy sauce sediment according to claim 4, characterized in that, The drive shaft (6) has a shaft hole and a rope hole through the outer side. The shaft hole and the rope hole are both equipped with sliding sealing sleeves. The inner shaft rod (801) passes through the shaft hole, and the winding rope (104) passes through the rope hole.

6. The apparatus for removing soy sauce sediment according to any one of claims 1-5, characterized in that, A pressure relief valve (401) is provided on the outside of the tank (4), and a pressure gauge is provided on the pressure relief valve (401).

7. The apparatus for removing soy sauce sediment according to claim 6, characterized in that, The can lid (5) is fixedly installed on the can body (4) by locking bolts (501).

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