Tank container

Abstract

This invention provides a tank container, comprising: a tank body, including a tank body itself and two first connecting rings respectively disposed at both ends of the tank body along the axial direction. The first connecting rings are cylindrical, circumferentially disposed around the outer periphery of the tank body, and protrude along the axial direction of the tank body; and two end frames, disposed opposite to each other at both ends of the tank body. Each end frame includes a frame body and a second connecting ring protruding from one side of the frame body. The second connecting rings are also cylindrical and fit together with the first connecting rings. The first and second connecting rings are respectively engaged by plastic deformation. By adding two connecting rings between the tank body and the end frames, the tank body and end frames can be pre-manufactured separately and then assembled to quickly form a tank container product. This breaks through the traditional limitation of assembling the tank container first and then painting the whole thing, significantly reducing the amount of painting work and shortening the manufacturing cycle of the tank container.

Description

Technical Field

[0001] This invention relates to the field of tank container manufacturing technology, and in particular to a tank container. Background Technology

[0002] A frame-structured tank container typically consists of a frame and a tank body. The tank body is formed by connecting a cylindrical body and two end caps to create a sealed container. The two ends of the tank body are connected to the frame via cylindrical connecting rings supported on the end caps.

[0003] The tank frame is made of carbon steel and requires painting to prevent corrosion. The tank body and connecting rings are mostly made of stainless steel and generally do not require painting. If the frame is painted first and then welded to the tank body, the paint on the frame will be damaged by the welding process. Therefore, during manufacturing, the frame and tank body are usually welded together to form a complete tank before painting. At the same time, the tank body and connecting rings are wrapped and isolated to prevent painting.

[0004] However, the large size of the entire container increases the workload of painting and places higher demands on the site and operation of the painting work. Furthermore, handling and moving the entire container is difficult, resulting in lower production efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a tank container to solve the problems of long painting time and low production efficiency caused by full-container painting in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A tank container includes: a tank body comprising a tank body and two first connecting rings respectively disposed at both ends of the tank body along the axial direction, the first connecting rings being cylindrical, circumferentially disposed around the outer periphery of the tank body, and protruding along the axial direction of the tank body; and two end frames disposed opposite to each other at both ends of the tank body, each end frame comprising a frame body and a second connecting ring protruding from one side of the frame body, the second connecting ring also being cylindrical to engage with the first connecting rings, and the first connecting rings and the second connecting rings being respectively engaged together by plastic deformation.

[0008] According to one embodiment of the present invention, both the first connecting ring and the second connecting ring are plastically deformed by stamping to form an engagement portion recessed to the same side; the engagement portions of the first connecting ring and the second connecting ring engage with each other.

[0009] According to one embodiment of the present invention, there is a gap between the interlocking portion and the end of the first connecting ring or the second connecting ring.

[0010] According to one embodiment of the present invention, the interlocking portion extends circumferentially along the first connecting ring or the second connecting ring to form a ring arrangement.

[0011] According to one embodiment of the present invention, the interlocking portion has multiple portions and is distributed along the outer circumference of the first connecting ring or the second connecting ring.

[0012] According to one embodiment of the present invention, the interlocking part is elongated, and its length direction is consistent with the axial or circumferential direction of the can body.

[0013] According to one embodiment of the present invention, the outer contour of the occlusal portion is circular.

[0014] According to one embodiment of the present invention, the cross-section of the occlusal portion is arc-shaped, V-shaped, or wavy.

[0015] According to one embodiment of the present invention, the first connecting ring protrudes from one end of the tank body and is bent to form a first engaging portion; the second connecting ring protrudes from one end of the frame body and is bent to form a second engaging portion, and the second engaging portion engages and is fixed with the first engaging portion.

[0016] According to one embodiment of the present invention, the first connecting ring is provided with a through hole; the second connecting ring is provided with a positioning hole corresponding to the through hole, and a protruding vertical edge is formed by pulling at the positioning hole; the vertical edge is correspondingly engaged in the through hole.

[0017] According to one embodiment of the present invention, the tank body and the first connecting ring are both made of stainless steel and are welded together; the frame is made of carbon steel and the second connecting ring is made of stainless steel. The frame and the second connecting ring are welded together, and the outer surface of the frame and the connection between the frame and the second connecting ring are respectively coated with paint.

[0018] As can be seen from the above technical solution, the tank container provided by the present invention has at least the following advantages and positive effects:

[0019] The end frame can be connected to the first connecting ring on the tank body via its second connecting ring, thus achieving an indirect connection with the tank body. This avoids the direct welding of the end frame to the tank body, which would damage the paint layer on the end frame. In other words, the tank body and end frame can be manufactured separately and then assembled to quickly form a tank container product. This breaks through the traditional limitation of assembling the tank container first and then painting the whole thing. Since there is no need to paint the entire large tank container, the amount of painting work is greatly reduced, the overall handling of the tank container is reduced, the manufacturing cycle of the tank container is shortened, and the production efficiency of tank containers is improved. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the overall assembly of the tank container in the first embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the connection between the end frame and the second connecting ring in the first embodiment of the present invention.

[0022] Figure 3 for Figure 2 Side view.

[0023] Figure 4 for Figure 1 A-direction view.

[0024] Figure 5 This is a schematic diagram of the connection between the first connecting ring and the second connecting ring in the first embodiment of the present invention.

[0025] Figure 6 for Figure 1 Enlarged view of point B.

[0026] Figure 7 This is a schematic diagram showing the connection between the first occlusal portion and the second occlusal portion in the first embodiment of the present invention.

[0027] Figure 8 This is a schematic diagram of the overall assembly of the tank container in the second embodiment of the present invention.

[0028] Figure 9 for Figure 8 The C-direction view.

[0029] Figure 10 This is a schematic diagram of the connection between the first connecting ring and the second connecting ring in the second embodiment of the present invention.

[0030] Figure 11 This is a schematic diagram of the overall assembly of the tank container in the third embodiment of the present invention.

[0031] Figure 12 for Figure 11 The D-direction view.

[0032] Figure 13 This is a schematic diagram of the connection between the first connecting ring and the second connecting ring in the third embodiment of the present invention.

[0033] Figure 14 This is a schematic diagram showing the connection between the first biting part and the second biting part in the fourth embodiment of the present invention.

[0034] Figure 15 This is a schematic diagram of the first connecting ring and the second connecting ring before they are fitted together in the fifth embodiment of the present invention.

[0035] Figure 16 This is a schematic diagram of the first connecting ring and the second connecting ring being engaged in the fifth embodiment of the present invention.

[0036] The annotations in the attached figures are explained as follows:

[0037] 1-Tank body; 11-Tank body; 111-Cylinder; 113-End cap; 12-First connecting ring; 121a, 121b, 121c, 121d-First interlocking parts; 101-Through hole;

[0038] 3-End frame; 31-Frame body; 311-Column; 312-Upper end beam, 313-Lower end beam; 314-Diagonal brace; 32-Second connecting ring; 321a, 321b, 321c, 321d-Second interlocking part; 301-Positioning hole; 302-Vertical edge. Detailed Implementation

[0039] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0040] This embodiment provides a tank container with two connecting rings added between the tank body and the end frames. The first connecting ring is attached to the tank body, and the second connecting ring is attached to the end frames, allowing the tank body and end frames to be pre-manufactured separately. The end frames can be painted during manufacturing. The first and second connecting rings are then engaged to assemble a complete tank container. This eliminates the need to paint the entire tank container, reducing painting workload and eliminating the need for overall handling of the tank container during painting, significantly improving the production efficiency of tank containers.

[0041] First embodiment of tank container

[0042] Please refer to Figure 1 , Figure 1 This embodiment illustrates the specific structure of a tank container, which mainly includes a tank body 1 and two end frames 3. The two end frames 3 are positioned opposite each other at both ends of the tank body 1. A protruding first connecting ring 12 is provided on the tank body 1 to correspondingly engage with a second connecting ring 32 protruding from the end frames 3, thereby achieving a non-welded connection and fixation between the tank body 1 and the two end frames 3. This allows for the rapid formation of a standard tank container, shortening the manufacturing time.

[0043] The tank body 1 includes a tank body 11 and two first connecting rings 12 respectively located at both ends of the tank body 11 along the axial direction.

[0044] The tank body 11 includes a cylindrical body 111 and two end caps 113 respectively sealed at both ends of the cylindrical body 111, and is used as a container for transporting and storing media such as chemical liquids or liquid food.

[0045] The tank body 11 is made of stainless steel, which not only has good corrosion resistance but also sufficient strength.

[0046] The first connecting ring 12 is also made of stainless steel, based on the requirement of corrosion prevention for the direct connection between the first connecting ring 12 and the tank body 11.

[0047] The first connecting ring 12 is cylindrical, circumferentially arranged along the outer peripheral wall of the tank body 11, and protrudes axially along the tank body 11. In this embodiment, the first connecting ring 12 is sleeved and welded to the edge where the end cap 113 meets the cylinder 111. One end of the first connecting ring 12 away from the cylinder 111 along the axial direction of the cylinder 111 is a suspended end, which does not extend beyond the end face of the end cap 113.

[0048] The end frame 3 includes a frame 31 and a second connecting ring 32 that protrudes from the frame 31 toward the tank 1.

[0049] The frame 31 is made of carbon steel, which has high strength and rigidity, but is relatively easy to rust and requires appropriate anti-corrosion treatment, such as painting or galvanizing.

[0050] Please combine Figure 2 and Figure 3 The frame 31 includes two opposing columns 311, an upper end beam 312 and a lower end beam 313 respectively connected to the two ends of the two columns 311, and multiple diagonal braces 314 connected between the columns 311 and the upper end beam 312 and between the columns 311 and the lower end beam 313.

[0051] The second connecting ring 32 is made of stainless steel, which has corrosion-resistant properties.

[0052] Please refer to Figure 4 The second connecting ring 32 is cylindrical. The outer edge of one end of the second connecting ring 32 is welded and fixed to the two columns 311 and the diagonal brace 314. The other end extends beyond the inner side of the column 311 along the axial direction of the tank body 1 to be sleeved with the suspended end of the first connecting ring 12. The two ends are respectively engaged together by plastic deformation, thereby tightly connecting the tank body 1 and the end frame 3 together.

[0053] In this embodiment, after the frame 31 and the second connecting ring 32 are welded together, anti-corrosion paint treatment is required on the outer surface of the carbon steel frame 31. Furthermore, the paint also covers at least the weld seam between the frame 31 and the second connecting ring 32.

[0054] Based on the above, the tank body 1 and end frame 3 can be pre-manufactured separately. During the manufacturing process, the tank body 11 and the first connecting ring 12, both made of stainless steel, do not require painting after welding; however, due to the special nature of carbon steel, the end frame 31 needs to be welded to the second connecting ring 32 before separate painting. Then, through the non-welding interlocking connection of the first connecting ring 12 and the second connecting ring 32, the tank body 1 and the end frame 3 are indirectly connected and fixed, avoiding welding damage to the anti-corrosion paint layer on the end frame 3, eliminating the need for overall painting of the assembled tank, reducing the amount of painting work, lowering labor intensity, shortening manufacturing time, and improving the production efficiency of the tank products. Moreover, the reduction in painting reduces the pollution caused by volatile substances in the paint to the environment, meeting increasingly stringent environmental protection requirements and demonstrating wide adaptability.

[0055] Please refer to further details. Figure 5 and Figure 6 , Figure 6 The interlocking connection of the first connecting ring 12 and the second connecting ring 32 is shown.

[0056] The first connecting ring 12 and the second connecting ring 32 are respectively stamped by special stamping equipment to produce plastic deformation, forming a first interlocking part 121a and a second interlocking part 321a that are recessed into the inside of the tank.

[0057] The first engagement portion 121a on the first connecting ring 12 is close to the suspended end and has a certain gap with the outer edge of the end of the suspended end.

[0058] The first engagement portion 121a is arranged circumferentially along the outer periphery of the first connecting ring 12, forming a complete annular groove.

[0059] The cross-section of the first biting part 121a is an upward-opening arc shape.

[0060] The second engagement portion 321a on the second connecting ring 32 has a similar structure to the first engagement portion 121a on the first connecting ring 12, and their shapes and sizes are compatible.

[0061] During connection, the end of the second connecting ring 32 facing the tank 1 is sleeved onto the suspended end of the first connecting ring 12. The first engaging portion 121a and the second engaging portion 321a are recessed towards the same inner side and have a matching arc-shaped profile. When the second engaging portion 321a is correspondingly embedded in the first engaging portion 121a, a tight engaging connection can be formed. At the same time, the outer and inner peripheral walls of the ends of the first connecting ring 12 and the second connecting ring 32 that are sleeved together fit together.

[0062] It should be noted that the first connecting ring 12 and the second connecting ring 32 form a tight interlock through plastic deformation. Unlike the traditional welding method, this not only reduces the amount of welding work, but also, due to the arc design of the interlocking part, can be regarded as a flexible connection structure. This can buffer the relative movement between the tank body 1 and the end frame 3 caused by vibration during transportation, thereby improving the overall structural strength and connection stability of the tank.

[0063] In this embodiment, the cross-sections of both the first occlusal portion 121a and the second occlusal portion 321a are arc-shaped. Please refer to... Figure 7 The cross-section of the aforementioned interlocking portion can also be a V-shape with the opening facing upwards, and the first connecting ring 12 and the second connecting ring 32 are connected in a V-shape. Alternatively, the cross-section of the interlocking portion can also be wavy, with multiple interlocking points, so that the first connecting ring 12 and the second connecting ring 32 can be interlocked more tightly.

[0064] In this embodiment, the first connecting ring 12 and the second connecting ring 32 can be adapted circular, elliptical, or square cylindrical section structures. In other embodiments, the connecting rings can also be tapered cylindrical section structures with an incline.

[0065] Second embodiment of tank container

[0066] Please refer to the above as well. Figures 8 to 10 The tank container structure provided in this embodiment differs from that of the tank container in the first embodiment in that the interlocking parts are not distributed in a complete ring, but rather there are multiple interlocking parts.

[0067] The first connecting ring 12 and the second connecting ring 32 are respectively stamped by special stamping equipment to produce plastic deformation, forming the first engagement part 121b and the second engagement part 321b that are recessed inward.

[0068] Multiple first engagement portions 121b are evenly distributed along the outer circumference of the first connecting ring 12 so as to be located on the circumference of the same circle.

[0069] Each first occlusal part 121b is elongated, specifically an elongated oval with rounded corners at both ends.

[0070] The first engagement portion 121b extends circumferentially along the first connecting ring 12 and is distributed in segments on the first connecting ring 12.

[0071] Correspondingly, the second engagement portion 321b on the second connecting ring 32 has multiple engagement portions, and the structure of the engagement portion is the same as that of the first engagement portion 121b on the first connecting ring 12, and the number, shape and size are matched.

[0072] During connection, the end of the second connecting ring 32 facing the tank 1 is sleeved onto the suspended end of the first connecting ring 12. The first engaging portion 121b and the second engaging portion 321b are recessed towards the same inner side and are respectively provided one-to-one. When the second engaging portion 321b is correspondingly embedded in the first engaging portion 121b, a tight engaging connection can be formed. At the same time, the outer and inner peripheral walls of the ends of the first connecting ring 12 and the second connecting ring 32 that are sleeved together are in close contact with each other.

[0073] In this embodiment, the length direction of the first engaging portion 121b is consistent with the circumferential direction of the first connecting ring 12. In other embodiments, the length direction of the first engaging portion 121b may be consistent with the axial direction of the can body, that is, it extends along the width direction of the first connecting ring 12.

[0074] In this embodiment, the cross-sections of the first biting portion 121b and the second biting portion 321b can be arc-shaped, V-shaped, wavy, or other shapes.

[0075] In this embodiment, multiple interlocking parts form a tight interlock, which is different from the traditional welding method, reducing the amount of welding work. Furthermore, due to the plastic deformation design of the interlocking parts, the relative movement between the tank body 1 and the end frame 3 caused by vibration during transportation can be buffered, thereby improving the overall structural strength and connection stability of the tank.

[0076] Thus, the first connecting ring 12 and the second connecting ring 32 adopt a non-welded interlocking connection method to achieve indirect connection and fixation between the tank body 1 and the end frame 3. This avoids welding damage to the anti-corrosion paint layer on the end frame 3, eliminates the need for overall painting of the assembled tank, reduces the amount of painting work, lowers labor intensity, shortens manufacturing time, and improves the production efficiency of the tank product. Moreover, the reduction in painting reduces the pollution caused by volatile substances in paint to the environment, meets increasingly stringent environmental protection requirements, and has wide adaptability.

[0077] Third embodiment of tank container

[0078] Please refer to the above as well. Figures 11 to 13 The tank container structure provided in this embodiment differs from that of the tank container in the first embodiment in that the interlocking parts are not distributed in a complete ring, but rather have multiple parts.

[0079] The first connecting ring 12 and the second connecting ring 32 are respectively stamped by special stamping equipment to produce plastic deformation, forming the first engagement part 121c and the second engagement part 321c that are recessed inward.

[0080] Multiple first engagement portions 121c are evenly distributed along the outer circumference of the first connecting ring 12, so as to be located on the circumference of the same circle.

[0081] The outer contour of the first biting part 121c is circular, and it is distributed in a dotted pattern on the first connecting ring 12.

[0082] The second engagement portion 321c on the second connecting ring 32 has multiple second engagement portions 321c, and the structure of the engagement portion is the same as that of the first engagement portion 121c on the first connecting ring 12, and the number, shape and size are matched.

[0083] During connection, the end of the second connecting ring 32 facing the tank 1 is sleeved onto the suspended end of the first connecting ring 12. The first engaging portion 121c and the second engaging portion 321c are recessed towards the same inner side and are respectively provided one-to-one. When the second engaging portion 321c is correspondingly embedded in the first engaging portion 121c, a tight engaging connection can be formed. At the same time, the outer and inner peripheral walls of the ends of the first connecting ring 12 and the second connecting ring 32 that are sleeved together are in close contact with each other.

[0084] Since the first connecting ring 12 and the second connecting ring 32 adopt a non-welding interlocking connection method, the tank body 1 and the end frame 3 are indirectly connected and fixed, avoiding the damage of the anti-corrosion paint layer on the end frame 3 by welding, eliminating the need for overall painting of the assembled tank box, reducing the amount of painting work, and improving the production efficiency of the tank box products.

[0085] Fourth embodiment of tank container

[0086] Please refer to Figure 14 The tank container provided in this embodiment differs from the tank container in the first embodiment in that the interlocking part is not designed to be recessed inward, but rather has a bent structure.

[0087] The first connecting ring 12 and the second connecting ring 32 are respectively stamped by special stamping equipment to produce plastic deformation, and one end of each ring is bent to form an interlocking part.

[0088] by Figure 13 With reference to the view direction, the first connecting ring 12 protrudes from one end of the tank body 11 and is bent upward to form a first engaging portion 121d. The first engaging portion 121d has a slope, and the angle between the slope and the horizontal plane is an obtuse angle.

[0089] The outer periphery of the end of the second connecting ring 32 protruding towards the frame 31 is bent downward to form a second engaging portion 321d. The second engaging portion 321d has an inclined surface that is adapted to fit the slope of the inclined surface, so that the second engaging portion 321d can be engaged and fixed with the first engaging portion 121d.

[0090] In this embodiment, the first biting portion 121d and the second biting portion 321d are both distributed in a complete circle along the circumference of each connecting ring.

[0091] Fifth embodiment of tank container

[0092] Please refer to the above as well. Figure 15 and Figure 16 The tank container provided in this embodiment differs from the tank container in the first embodiment in that the interlocking part is formed by plastic deformation using a drawing process.

[0093] Specifically, the first connecting ring 12 has a through hole 101. The second connecting ring 32 has a positioning hole 301 corresponding to the through hole 101, and a protruding vertical edge 302 is formed by pulling at the positioning hole 301. The shape and size of the vertical edge 302 are adapted to the inner diameter of the through hole so that it can be tightly locked in the through hole 101, thereby connecting the first connecting ring 12 and the second connecting ring 32 together.

[0094] In summary, the tank container provided by this invention has at least the following advantages and positive effects:

[0095] First, the tank body 1 and end frame 3 can be pre-manufactured separately without affecting each other. During the manufacturing process, the tank body 11 and the first connecting ring 12, both made of stainless steel, do not require painting after welding; however, due to the special nature of carbon steel, the end frame 31 needs to be welded to the second connecting ring 32 before the end frame 3 is painted separately. In this way, the end frame 3 is indirectly connected to the tank body 1 through the connection of the first connecting ring 12 and the second connecting ring 32, avoiding direct welding that would damage the anti-corrosion paint layer on the end frame 3. That is, the connection method using two connecting rings can solve the problem of the paint layer of the end frame 3 being damaged. Therefore, the end frame 3 can be painted first, and there is no need to worry about touch-up painting later. This breaks through the traditional limitation of assembling the tank container first and then painting the whole thing, shortening the tank container manufacturing cycle and improving the production efficiency of the tank container.

[0096] Moreover, the reduction in paint spraying reduces the pollution caused by volatile substances in paint to the environment, meeting increasingly stringent environmental protection requirements and making it widely adaptable.

[0097] Then, the first connecting ring 12 and the second connecting ring 32 form interlocking parts through plastic deformation, forming a tight interlock. This is different from the traditional welding method. It not only reduces the amount of welding work, but also, due to the arc-shaped and V-shaped design of the interlocking parts, can be regarded as a flexible connection structure. It can buffer the relative movement between the tank body 1 and the end frame 3 caused by vibration during transportation, and improve the overall structural strength and connection stability of the tank.

[0098] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A tank container, characterized in that include: The tank body includes a tank body and two first connecting rings respectively disposed at both ends of the tank body along the axial direction. The first connecting rings are cylindrical, circumferentially disposed around the outer periphery of the tank body, and protrude along the axial direction of the tank body. Two end frames are disposed opposite to each other at both ends of the tank body. Each end frame includes a frame and a second connecting ring protruding from one side of the frame. The second connecting ring is also cylindrical to fit into the first connecting ring, and the first connecting ring and the second connecting ring are respectively engaged together by plastic deformation. The first connecting ring and the second connecting ring respectively form interlocking parts through plastic deformation, and the interlocking parts of the first connecting ring and the second connecting ring interlock accordingly; Wherein: the first connecting ring and the second connecting ring are respectively stamped by special stamping equipment to produce plastic deformation, and one end of each is bent to form the interlocking part; Alternatively, the first connecting ring has a through hole; the second connecting ring has a positioning hole corresponding to the through hole, and a protruding vertical edge is formed by pulling at the positioning hole; the vertical edge is correspondingly engaged in the through hole.

2. The tank container according to claim 1, characterized in that: Both the first connecting ring and the second connecting ring are plastically deformed by stamping to form an interlocking portion that is recessed to the same side.

3. The tank container according to claim 2, characterized in that: There is a gap between the interlocking portion and the end of the first connecting ring or the second connecting ring.

4. The tank container according to claim 3, characterized in that: The interlocking portion extends circumferentially along the first or second connecting ring to form a ring arrangement.

5. The tank container according to claim 3, characterized in that: The interlocking portion has multiple parts, which are distributed along the outer circumference of the first connecting ring or the second connecting ring.

6. The tank container according to claim 5, characterized in that: The interlocking part is elongated, and its length direction is consistent with the axial or circumferential direction of the can body.

7. The tank container according to claim 5, characterized in that: The outer contour of the biting part is circular.

8. The tank container according to claim 2, characterized in that: The cross-section of the occlusal part is arc-shaped, V-shaped, or wavy.

9. The tank container according to claim 1, characterized in that: The first connecting ring protrudes from one end of the tank body and is bent to form a first interlocking part; The end of the second connecting ring that protrudes into the frame is bent to form a second engaging portion, which engages and is fixed with the first engaging portion.

10. The tank container according to claim 1, characterized in that: Both the tank body and the first connecting ring are made of stainless steel and are welded together. The frame is made of carbon steel, and the second connecting ring is made of stainless steel. The frame and the second connecting ring are welded and fixed together. The outer surface of the frame and the connection between the frame and the second connecting ring are respectively painted.

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