A concrete vertical conveying tool
By designing a vertical concrete conveying tool including a conveying pipe body, a conveying mixing assembly and a support frame, the problem of inconvenience in concrete conveying in construction is solved, and efficient conveying and quality assurance of concrete is achieved.
Patent Information
- Application Number
- CN202211522229.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-11-30
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2042-11-30
AI Technical Summary
During construction, especially in mountainous areas, the road is winding and rugged and the vertical height drop is large, resulting in inconvenient concrete transport and it is impossible to directly reach the construction site.
A concrete vertical conveying tool is designed, including a conveying pipe body, a conveying mixing assembly and a support frame. The conveying pipe body consists of a top section pipe, a middle section pipe and a bottom section pipe, and is connected by a joint clamp, and the number of middle section pipes can be adjusted according to the height drop. The conveying mixing assembly includes a rotating shaft and spiral blades for stirring the concrete and fixed at the construction site by a support frame.
It realizes convenient transportation of concrete between different heights and stirs during the conveying process, reducing the possibility of concrete separation and ensuring the quality of concrete.
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Figure CN116065823B_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of building construction, and in particular to a tool for vertically conveying concrete. Background Art
[0002] Currently in the process of building construction, concrete is a necessary binder.
[0003] During the construction of houses, bridges, roads, etc. in mountainous areas, it is often encountered that the transportation of concrete is extremely inconvenient due to the winding and rugged roads and large vertical height differences, and the concrete cannot reach the construction site directly. Summary of the invention
[0004] In order to facilitate the transportation of concrete and ensure the quality of concrete, the present application provides a concrete vertical transportation tool.
[0005] The above technical objectives of this application are achieved through the following technical solutions:
[0006] A vertical concrete conveying tool comprises a conveying pipe body, the conveying pipe body comprises a top section pipe, a middle section pipe is arranged at one end of the top section pipe, a bottom section pipe is arranged at the end of the middle section pipe away from the top section pipe, joint clamps are arranged between the top section pipe and the middle section pipe, and between the middle section pipe and the top section pipe, a rotating shaft is arranged inside the conveying pipe body, the rotating shaft is rotatably connected to the conveying pipe body, spiral blades are arranged on the outer surface of the rotating shaft, and a support frame is arranged on the bottom section pipe.
[0007] By adopting the above scheme, when it is necessary to use a conveying tool to convey concrete, first, the top section pipe, the middle section pipe and the bottom section pipe are connected to each other through the joint clamp. At this time, it should be noted that the number of middle section pipes can be determined according to the height difference. When the height difference is large, the number of middle section pipes can be appropriately increased; then the position of the conveying pipe body is fixed by the support frame. When in use, concrete is added into the conveying pipe body from the upper end of the top section pipe, and the rotating shaft is rotated. The rotating shaft will drive the concrete inside the conveying pipe body to move downward, so that the concrete can be transported to the designated location below, achieving the effect of facilitating the transportation of concrete; at the same time, the spiral blades on the outer surface of the rotating shaft will stir the concrete, which can reduce the possibility of concrete segregation and thus ensure the quality of the concrete.
[0008] Preferably, the rotating shaft and the spiral blades on the rotating shaft are divided into three sections corresponding to the top tube section, the middle tube section and the bottom tube section and having the same length, and two adjacent sections of the rotating shaft are detachably connected.
[0009] Preferably, plug-in blocks are provided at one end of the rotating shaft of the top section and the middle section and at both ends of the rotating shaft of the bottom section, and a connecting groove for the plug-in block to enter is provided at the other end of one end of the rotating shaft of the top section and the middle section.
[0010] Preferably, the middle section pipe includes a fixed pipe and a movable pipe which are coaxially connected to each other. A sliding pipe is coaxially fixed to one end of the movable pipe close to the fixed pipe. The sliding pipe is inserted into the fixed pipe and is slidably connected to the fixed pipe. An adjusting ring is sleeved on the fixed pipe. The inner surface of the adjusting ring is embedded in the outer surface of the fixed pipe and is threadedly connected to the outer surface of the sliding pipe.
[0011] Preferably, a limiting strip is arranged inside the fixed tube, and a limiting groove for the limiting strip to enter is opened on the outer surface of the sliding tube, and the opening direction of the limiting groove is the same as the axial direction of the sliding tube.
[0012] Preferably, a support ring is provided inside the bottom section tube, the support ring is arranged away from the middle section tube, an auxiliary plate is rotatably installed inside the support ring, a clearance groove is provided at the center position of the auxiliary plate for inserting the plug-in block at one end of the bottom section of the rotating shaft, an adjustment block that can be embedded in the inner surface of the bottom section tube is provided on the circumference of the support ring, and an elastic member that can drive the adjustment ring to move inside the bottom section tube along the axial direction of the bottom section tube is provided inside the side wall of the bottom section tube.
[0013] Preferably, the support frame includes a first support ring sleeved on the bottom section pipe, a second support ring is arranged on one side of the first support ring, and a lifting component for adjusting the distance between the first support ring and the second support ring is arranged between the first support ring and the second support ring.
[0014] Preferably, the lifting assembly includes a plurality of connecting rods rotatably connected to the first support ring, one end of the connecting rod away from the first support ring is slidably connected to the lifting rod, one end of the lifting rod away from the connecting rod is rotatably connected to the second support ring, and a limiting member is arranged between the lifting rod and the connecting rod.
[0015] Preferably, one end of the connecting rod close to the first support ring is sleeved on the first support ring, a pawl is provided on the bottom tube at a position corresponding to the end of the connecting rod, the pawl is rotatably connected to the bottom tube, and a slot for cooperating with the pawl is provided on the end of the connecting rod.
[0016] Preferably, a feeding pipe is arranged on the side wall of the top tube section, a trumpet-shaped feeding hopper is arranged at one end of the feeding pipe away from the top tube section, and an arc-shaped discharge pipe is arranged at one end of the bottom tube section away from the middle tube section.
[0017] In summary, this application has the following technical effects:
[0018] 1. By setting up a conveying tool, the concrete can be transported between two locations at different heights, and the concrete can be stirred during the conveying process, so as to facilitate the conveying of the concrete and ensure the quality of the concrete;
[0019] 2. By setting up a middle tube including a fixed tube, a movable tube and a sliding tube, after determining the number of middle tubes, people can also drive the sliding tube to move inside the fixed tube as needed, so that the vertical length of the conveying tool can be fine-tuned, making the conveying tool more convenient to use;
[0020] 3. By setting a ratchet, after the connecting rod and the first support ring rotate relative to each other, the ratchet can limit the connecting rod, so that the connecting rod and the first support ring can only rotate freely along a fixed direction, and the opposite direction will be restricted by the ratchet. In this way, after the distance between the first support ring and the second support ring is adjusted, the positional relationship between the two is more stable. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is an overall structural diagram of the conveying tool in the embodiment of the present application;
[0022] Figure 2 is a longitudinal cross-sectional view of a conveying tool in an embodiment of the present application;
[0023] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.
[0024] In the figure, 1. conveying pipe body; 11. top section pipe; 12. middle section pipe; 121. fixed pipe; 122. movable pipe; 123. sliding pipe; 124. adjusting ring; 125. limit strip; 126. adjusting block; 127. spring; 13. bottom section pipe; 14. joint clamp; 2. conveying and stirring assembly; 21. rotating shaft; 22. rotating motor; 23. spiral blade; 24. plug-in block; 25. support ring; 26. auxiliary plate; 27. connecting groove; 3. support frame; 31. first support ring; 32. second support ring; 33. connecting rod; 34. lifting rod; 35. limit bolt; 4. feeding pipe; 41. feeding hopper; 42. discharge pipe; 5. ratchet; 51. slot. DETAILED DESCRIPTION
[0025] The present application is further described in detail below in conjunction with the accompanying drawings.
[0026] Reference Figure 1The present application provides a vertical concrete conveying tool, including a conveying pipe body 1, a conveying and stirring assembly 2 and a support frame 3. The interior of the conveying pipe body 1 is hollow, the conveying and stirring assembly 2 is arranged inside the conveying pipe body 1 and can convey and stir concrete, and the support frame 3 is arranged on the conveying pipe body 1 and can support and fix the conveying pipe body 1. When the conveying tool is in use, the conveying pipe body 1 is fixed on the ground by the support frame 3. At this time, it is necessary to ensure that the two ends of the conveying pipe body 1 are respectively facing the area where concrete is provided and the area where concrete is needed. People add concrete from one end of the conveying pipe body 1 into the conveying pipe body 1, and the conveying and stirring assembly 2 can convey the concrete to the other end of the conveying pipe body 1. Finally, the concrete will be conveyed to the area where concrete is needed, so as to achieve the effect of facilitating the conveying of concrete in areas with winding and rugged roads and large vertical height differences; and while conveying the concrete, the conveying and stirring assembly 2 can stir the concrete, so as to reduce the possibility of concrete segregation, thereby ensuring the quality of the concrete.
[0027] The conveying pipe body 1 includes a top pipe section 11, a middle pipe section 12 and a bottom pipe section 13 which are coaxially connected together. In the present embodiment, the number of the middle pipe section 12 is 1. In other embodiments, the number of the middle pipe sections 12 can be determined according to the height difference in different use environments. A joint clamp 14 is provided at the connection between the top pipe section 11 and the middle pipe section 12, and at the connection between the middle pipe section 12 and the bottom pipe section 13. A tightening bolt is provided on the joint clamp 14. After the joint clamp 14 is sleeved on the outer surface of the pipeline, the tightening bolt is tightened to achieve a sealed connection between the top pipe section 11 and the middle pipe section 12, and between the middle pipe section 12 and the bottom pipe section 13. Similarly, if the number of middle pipe sections 12 used is greater than 1, the joint clamp 14 can also be used to connect two adjacent middle pipe sections 12 together. In the present embodiment, the length of the conveying pipe body 1 can be changed according to people's needs, which can expand the scope of application of the conveying tool.
[0028] Reference Figure 1 and Figure 2The conveying and stirring assembly 2 includes a rotating shaft 21, a rotating motor 22, a spiral blade 23 and a plug-in block 24. The rotating shaft 21 is coaxially arranged inside the conveying pipe body 1, and the spiral blade 23 is fixed on the circumferential surface of the rotating shaft 21. In this embodiment, in order to make the rotating shaft 21 and the spiral blade 23 suitable for the situation where the length of the conveying pipe body 1 can be adjusted arbitrarily, the rotating shaft 21 and the spiral blade 23 are divided into three sections corresponding to the top section pipe 11, the middle section pipe 12 and the bottom section pipe 13 and having the same length; it should be noted here that the rotating shaft 21, the spiral blade 23 and the top section pipe 11, The middle section tube 12 and the bottom section tube 13 are in a one-to-one correspondence. When the number of middle section tubes 12 used increases, the number of sections of the rotating shaft 21 and the spiral blades 23 corresponding to the middle section tube 12 will also increase. The plug-in block 24 is in the shape of a hexahedron. In this embodiment, there are four plug-in blocks 24, which are respectively fixed on the end surface of the middle section rotating shaft 21 close to the top section tube 11, the end surface of the top section away from the middle section tube 12, and the two end surfaces of the lower section rotating shaft 21. The other end of one end of the rotating shaft 21 of the top section and the middle section is provided with a connecting groove 27 for the plug-in block 24 to enter.
[0029] A support ring 25 is arranged inside the end surfaces of the top section tube 11 and the bottom section tube 13 which are away from each other, and an auxiliary plate 26 is arranged inside the support ring 25. The auxiliary plate 26 is rotatably connected to the support ring 25, and a connecting groove 27 for inserting the plug-in block 24 is also provided on the auxiliary plate 26. The rotating motor 22 is arranged on the end surface of the top section tube 11 away from the bottom section tube 13 and is fixedly connected to the rotating shaft 21 of the upper section to drive the rotating shaft 21 to rotate.
[0030] The conveying and stirring assembly 2 is composed of multiple rotating shafts 21 and spiral blades 23 on the rotating shafts 21, and the plug-in block 24 is set to a hexahedron, so that two adjacent rotating shafts 21 can maintain synchronous rotation. When concrete needs to be conveyed, concrete is added to the top section pipe 11, and after the rotating motor 22 is started, the rotating motor 22 will drive the multiple rotating shafts 21 and the spiral blades 23 on the rotating shafts 21 to rotate together. The spiral blades 23 can convey the concrete and stir the concrete at the same time.
[0031] Reference Figure 1 In order to facilitate people to add concrete into the top section pipe 11, a feeding pipe 4 is connected to the side wall of the top section pipe 11. The feeding pipe 4 is connected to the inside of the top section pipe 11, and the end of the feeding pipe 4 away from the top section pipe 11 is connected to a feeding hopper 41. The feeding hopper 41 is generally in the shape of a trumpet and the wide mouth side is away from the feeding hopper 41.
[0032] The conveying tool is used in areas with a large height difference between the upper and lower parts. When concrete falls to the lower end of the bottom section pipe 13, its own moving speed may be relatively fast, and even cause concrete splashing. In order to reduce the possibility of the above situation, a discharge pipe 42 is provided at the lower end of the bottom section pipe 13. The discharge pipe 42 is arc-shaped as a whole, and the central axis of the discharge port of the discharge pipe 42 is horizontal; the arc-shaped discharge pipe 42 has a certain buffering effect on the falling speed of concrete, thereby reducing the possibility of concrete splashing.
[0033] Reference Figure 2 and Figure 3 The top tube section 11, the middle tube section 12 and the bottom tube section 13 all have a certain length. After the number of the middle tube sections 12 is determined, the two ends of the conveying pipe body 1 may not be connected to the concrete supply area and the concrete demand area respectively. In order to make the conveying tool more convenient to use, the middle tube section 12 is configured to include a fixed tube 121, a movable tube 122, a sliding tube 123 and an adjusting ring 124. The fixed tube 121 is coaxially arranged with the movable tube 122, and the sliding tube 123 is coaxially fixed to the movable tube 122 near the fixed tube. On the end surface of the tube 121, the inner diameter of the sliding tube 123 is larger than the inner diameter of the movable tube 122, and the outer diameter of the sliding tube 123 is smaller than the outer diameter of the movable tube 122. The end of the sliding tube 123 away from the movable tube 122 is inserted into the interior of the fixed tube 121 and is slidably connected to the fixed tube 121; the adjusting ring 124 is coaxially arranged on the end surface of the fixed tube 121 close to the movable tube 122 and is rotatably connected to the fixed tube 121. The adjusting ring 124 is also sleeved on the outside of the sliding tube 123 and is threadedly connected to the sliding tube 123.
[0034] After determining the number of middle-section tubes 12 and connecting the top-section tube 11, the middle-section tube 12 and the bottom-section tube 13 to each other, when people need to adjust the length of the conveying pipeline, they can rotate the adjusting ring 124. The adjusting ring 124 is threadedly connected to the sliding tube 123, so the adjusting ring 124 will drive the movable tube 122 to move closer to or away from the fixed tube 121 through the sliding tube 123. In this way, the length of a single middle-section tube 12 can be fine-tuned, making the conveying tool more convenient to use; it should be noted that in order to prevent the sliding tube 123 and the movable tube 122 from rotating with the adjusting ring 124, a limiting strip 125 embedded in the outer surface of the sliding tube 123 is provided on the side wall of the fixed tube 121. The length direction of the limiting strip 125 is the same as the axial direction of the sliding tube 123, and a limiting groove for the limiting strip 125 to enter is provided on the outer surface of the sliding tube 123.
[0035] Reference Figure 2, after the length of the middle tube 12 changes, in order to make the rotating shaft 21 suitable for the conveying tube body 1 after the length changes, an adjusting block 126 capable of being embedded in the inner surface of the bottom tube 13 is arranged on the circumference of the support ring 25 inside the bottom tube 13, and an elastic member capable of driving the adjusting ring 124 to move along the axial direction of the bottom tube 13 inside the bottom tube 13 is arranged inside the side wall of the bottom tube 13; in this embodiment, the elastic member is a spring 127, which is arranged on the side of the adjusting block 126 away from the top tube 11, and the spring 127 is in a compressed state inside the bottom tube 13. After the length of the middle tube 12 changes, the adjusting block 126 will move in the direction close to the middle tube 12 inside the bottom tube 13 under the elastic force of the spring 127, so that the rotating shaft 21 inside the conveying tube body 1 can be used normally.
[0036] Reference Figure 1 The support frame 3 includes a first support ring 31, a second support ring 32, a connecting rod 33, a lifting rod 34 and a limiting member. The first support ring 31 is sleeved on the bottom section tube 13 and fixedly connected to the bottom section tube 13. The second support ring 32 is arranged on one side of the first support ring 31 and remains coaxial with the first support ring 31. A plurality of connecting rods 33 are arranged along the circumference of the first support ring 31. One end of the plurality of connecting rods 33 close to the first support ring 31 is sleeved on the first support ring 31 and rotatably connected to the first support ring 31. The lifting rod 34 corresponds to the connecting rod 33 one by one. One end of the lifting rod 34 is sleeved on the connecting rod 33 and slidably connected to the connecting rod 33. One end of the lifting rod 34 away from the connecting rod 33 is sleeved on the second support ring 32 and rotatably connected to the second support ring 32. The limiting member is arranged between the connecting rod 33 and the lifting rod 34 and can fix the positional relationship between the two.
[0037] When the position of the conveying pipe body 1 needs to be fixed, the ground is leveled, and then the second support ring 32 is placed horizontally on the ground, and the support frame 3 can support the conveying pipe body 1; when people adjust the length of the conveying pipe body 1 through the adjustment ring, the distance between the first support ring 31 and the second support ring 32 will change. At this time, people can release the limiting effect of the limiting member on the connecting rod 33 and the lifting rod 34. After adjusting the distance between the first support ring 31 and the second support ring 32, the limiting member can be used again to limit the connecting rod 33 and the lifting rod 34.
[0038] In this embodiment, the limiting member is a limiting bolt 35 disposed at one end of the lifting rod 34 close to the connecting rod 33 . The limiting bolt 35 extends along the radial direction of the lifting rod 34 to the inside of the lifting rod 34 and presses against the connecting rod 33 .
[0039] If the number of middle tubes 12 included in the conveying pipe body 1 is relatively large, and the concrete inside the conveying pipe body 1 is added, the weight of the entire conveying tool will increase. In order to reduce the possibility of relative sliding between the connecting rod 33 and the lifting rod 34 under the limiting action of the limiting bolt 35, a ratchet 5 is provided on the bottom tube 13 at a position corresponding to the end of the connecting rod 33. The ratchet 5 is rotatably connected to the bottom tube 13, and a slot 51 for use with the ratchet 5 is provided on the end of the connecting rod 33. After adjusting the positional relationship between the connecting rod 33 and the lifting rod 34, people can insert the end of the ratchet 5 away from the bottom tube 13 into the slot 51. The ratchet 5 can limit the connecting rod 33 through the slot 51, making it difficult for the connecting rod 33 to rotate on the first support ring 31. In this way, the ratchet 5 can reduce the possibility of relative sliding between the connecting rod 33 and the lifting rod 34 under the limiting action of the limiting bolt 35 under strong pressure. It should be noted here that, because the distance between the first support ring 31 and the second support ring 32 changes under the premise that the connection angles between the connecting rod 33 and the first support ring 31 and the lifting rod 34 and the second support ring 32 will change, the pawl 5 can achieve the above effect.
[0040] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.
Claims
1. A vertical concrete transport tool, characterized in that: The conveying pipe body (1) comprises a top section pipe (11), one end of the top section pipe (11) is provided with a middle section pipe (12), one end of the middle section pipe (12) away from the top section pipe (11) is provided with a bottom section pipe (13), a joint clamp (14) is provided between the top section pipe (11) and the middle section pipe (12), and between the middle section pipe (12) and the top section pipe (11), a rotating shaft (21) is provided inside the conveying pipe body (1), the rotating shaft (21) is rotatably connected to the conveying pipe body (1), a spiral blade (23) is provided on the outer surface of the rotating shaft (21), and a support frame (3) is provided on the bottom section pipe (13); the rotating shaft (21) and the rotating shaft (21) are provided with a support frame (3). The spiral blades (23) on the shaft (21) are divided into three sections corresponding to the top section tube (11), the middle section tube (12) and the bottom section tube (13) and having the same length, and two adjacent sections of the rotating shaft (21) are detachably connected; the middle section tube (12) comprises a fixed tube (121), a movable tube (122), a sliding tube (123) and an adjusting ring (124); the fixed tube (121) and the movable tube (122) are coaxially arranged opposite to each other; the sliding tube (123) is coaxially fixed on the end surface of the movable tube (122) close to the fixed tube (121); the inner diameter of the sliding tube (123) is larger than the inner diameter of the movable tube (122); the outer diameter of the sliding tube (123) is The diameter of the sliding tube (123) is smaller than the outer diameter of the movable tube (122); one end of the sliding tube (123) away from the movable tube (122) is inserted into the interior of the fixed tube (121) and is slidably connected to the fixed tube (121); the adjusting ring (124) is coaxially arranged on the end surface of the fixed tube (121) close to the movable tube (122) and is rotatably connected to the fixed tube (121); the adjusting ring (124) is also sleeved on the outside of the sliding tube (123) and is threadedly connected to the sliding tube (123); when the length of the conveying tube body (1) needs to be adjusted, the adjusting ring (124) is rotated, and the adjusting ring (124) drives the movable tube (122) to move closer to the sliding tube (123) through the sliding tube (123). or moves in a direction away from the fixed tube (121); a support ring (25) is arranged inside the bottom tube (13), the support ring (25) is arranged away from the middle tube (12), an auxiliary plate (26) is rotatably installed inside the support ring (25), a central position of the auxiliary plate (26) is provided with a clearance groove for inserting a plug-in block (24) at one end of the bottom section of the rotating shaft (21), an adjustment block (126) capable of being embedded in the inner surface of the bottom tube (13) is arranged on the circumference of the support ring (25), and an elastic member capable of driving the adjustment block (126) to move inside the bottom tube (13) along the axial direction of the bottom tube (13) is arranged inside the side wall of the bottom tube (13).
2. A vertical concrete transport tool according to claim 1, characterized in that: A plug-in block (24) is provided at one end of the rotating shaft (21) of the top section and the middle section and at both ends of the rotating shaft (21) of the bottom section. A connecting groove (27) for the plug-in block (24) to enter is provided at the other end of one end of the rotating shaft (21) of the top section and the middle section.
3. A vertical concrete transport tool according to claim 1, characterized in that: A limiting strip (125) is arranged inside the fixed tube (121), and a limiting groove for the limiting strip (125) to enter is opened on the outer surface of the sliding tube (123), and the opening direction of the limiting groove is the same as the axial direction of the sliding tube (123).
4. A vertical concrete transport tool according to claim 1, characterized in that: The support frame (3) comprises a first support ring (31) sleeved on the bottom tube (13), a second support ring (32) is arranged on one side of the first support ring (31), and a lifting component for adjusting the distance between the first support ring (31) and the second support ring (32) is arranged between the first support ring (31) and the second support ring (32).
5. A vertical concrete transport tool according to claim 4, characterized in that: The lifting assembly comprises a plurality of connecting rods (33) rotatably connected to the first support ring (31); one end of the connecting rod (33) away from the first support ring (31) is slidably connected to a lifting rod (34); one end of the lifting rod (34) away from the connecting rod (33) is rotatably connected to the second support ring (32); and a limiting member is arranged between the lifting rod (34) and the connecting rod (33).
6. A vertical concrete transport tool according to claim 5, characterized in that: One end of the connecting rod (33) close to the first support ring (31) is sleeved on the first support ring (31), a ratchet (5) is arranged on the bottom tube (13) at a position corresponding to the end of the connecting rod (33), the ratchet (5) is rotatably connected to the bottom tube (13), and a slot (51) for use with the ratchet (5) is provided on the end of the connecting rod (33).
7. A vertical concrete transport tool according to claim 1, characterized in that: A feeding pipe (4) is arranged on the side wall of the top tube section (11), a bell-shaped feeding hopper (41) is arranged at one end of the feeding pipe (4) away from the top tube section (11), and an arc-shaped discharge pipe (42) is arranged at one end of the bottom tube section (13) away from the middle tube section (12).
Citation Information
Patent Citations
Exhaust manifold
CN207470277U
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CN210682154U
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