A device for smoothing the inner wall of the lower tube of a carbon fiber electric vehicle
The silicone tube and air bag combination structure of the carbon fiber electric vehicle lower tube inner wall smoothing device solves the battery assembly jamming problem caused by the uneven inner wall of the carbon fiber lower tube, achieving more efficient assembly and a more aesthetically pleasing inner wall effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TIANJIN FUJI-TA SPORTS GOODS CO LTD
- Filing Date
- 2025-07-25
- Publication Date
- 2026-07-31
AI Technical Summary
The inner wall of the existing carbon fiber electric vehicle's lower tube is not smooth during the manufacturing process, which causes jamming during battery assembly, affecting assembly efficiency and aesthetics.
A device for smoothing the inner wall of the carbon fiber electric vehicle lower tube is adopted. The carbon fiber lower tube is extruded and formed by a combination of silicone tube and air bag. The silicone tube is expanded by inflating the air bag, thereby achieving a smoothing treatment of the inner wall of the carbon fiber lower tube.
The smoothness of the inner wall of the carbon fiber lower tube was improved, avoiding jamming during battery assembly, improving vehicle assembly efficiency and enhancing the product's aesthetics.
Smart Images

Figure CN224576220U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electric vehicles, and in particular to a device for smoothing the inner wall of the lower tube of a carbon fiber electric vehicle. Background Technology
[0002] The existing carbon fiber electric vehicle lower tube inner wall is not molded with silicone during the product manufacturing process, resulting in an uneven inner wall with burrs or starting points. This often causes jamming during battery assembly, affecting battery assembly, reducing vehicle assembly efficiency, and causing inconvenience to staff. Summary of the Invention
[0003] This utility model addresses the aforementioned shortcomings of the existing technology by providing a carbon fiber electric vehicle lower tube inner wall smoothing forming device that makes battery assembly more convenient, avoids jamming, improves vehicle assembly efficiency, and makes the inner wall of the product more aesthetically pleasing.
[0004] The objective of this utility model is achieved through the following technical solution:
[0005] A device for smoothing the inner wall of the lower tube of a carbon fiber electric vehicle includes a forming worktable and an auxiliary clamping frame. The upper part of the forming worktable has two fixed uprights arranged symmetrically. The auxiliary clamping frame is connected inside the fixed uprights and slides within them. The fixed uprights have two symmetrically arranged positioning connection holes. A first adjusting handwheel is threaded into the auxiliary clamping frame. One end of the first adjusting handwheel passes through the auxiliary clamping frame and connects to the fixed uprights, allowing it to rotate within the fixed uprights. Two supporting slide rods are symmetrically arranged on one side of the auxiliary clamping frame. The outer side of each supporting slide rod is connected to a positioning connection hole, allowing it to slide within the positioning connection hole.
[0006] The supporting slide rod of this utility model passes through a positioning connection hole and connects to an adjusting bracket. The lower part of the adjusting bracket is connected to a forming worktable. The adjusting bracket slides on the forming worktable. The bottom of the adjusting bracket has a positioning protrusion. The upper part of the forming worktable has multiple positioning grooves. The positioning grooves are symmetrically arranged. The positioning protrusion is connected to the inner side of the positioning groove. The positioning protrusion slides within the positioning groove.
[0007] The adjustment bracket of this utility model has an auxiliary connecting plate at the top and a support plate at the bottom. The auxiliary connecting plate is connected to a second adjustment handwheel by a thread. The lower part of the second adjustment handwheel passes through the auxiliary connecting plate and is connected to a fastening pressure plate. The side wall of the adjustment bracket has an adjustment groove. The fastening pressure plate is connected to the inner side of the adjustment groove and slides within the adjustment groove.
[0008] The present invention describes a fastening plate with two springs connected to its upper part, the springs being symmetrically arranged. An adjusting groove is connected to the outer side of each spring, allowing the springs to slide within the adjusting groove. Multiple adjusting brackets are connected to the outer side of the carbon fiber lower tube, and multiple support plates are connected to the lower part of the carbon fiber lower tube. Multiple fastening plates are connected to the upper part of the support plates. A silicone tube is connected to the inner side of the carbon fiber lower tube, and an air bag is connected to the inner side of the silicone tube. One end of the air bag has an air inlet, and the other end has an air outlet. An auxiliary connecting pipe is connected to the inner side of the air inlet, and the other end of the auxiliary connecting pipe is connected to the air pump outlet. The bottom of the air pump is connected to a molding worktable. Beneficial effects
[0009] This utility model uses an inflatable air bag to compress a silicone tube. The silicone tube expands outward under pressure, which in turn compresses the interior of the carbon fiber lower tube. During molding, high pressure is applied to the smooth surface of the silicone tube to compress the carbon fiber lower tube, making the inner surface even smoother. The smooth inner wall of the carbon fiber lower tube makes battery assembly easier, avoids jamming, improves vehicle assembly efficiency, and makes the inner wall of the product more aesthetically pleasing.
[0010] This utility model provides an auxiliary clamping frame for clamping the carbon fiber lower tube. The auxiliary clamping frame plays a role in fixing and securing the carbon fiber lower tube, preventing the inner wall of the carbon fiber lower tube from shaking during the molding process, and making the overall structure more stable. Attached Figure Description
[0011] Figure 1 This is a left-side view of the structure of a carbon fiber electric vehicle lower tube inner wall smoothing forming device according to the present invention.
[0012] Figure 2 This is a right-side view of the structure of a carbon fiber electric vehicle lower tube inner wall smoothing forming device according to the present invention.
[0013] Figure 3 This is a schematic diagram of the forming workbench structure of a carbon fiber electric vehicle lower tube inner wall smoothing forming device according to the present invention.
[0014] Figure 4 This is a schematic diagram of the combined structure of a carbon fiber lower tube, silicone tube, and air bag in a carbon fiber electric vehicle lower tube smoothing forming device according to the present invention.
[0015] Figure 5 This is a schematic diagram of the auxiliary clamping frame structure of the carbon fiber electric vehicle lower tube inner wall smoothing forming device described in this utility model.
[0016] Figure 6 This is a bottom view of the auxiliary clamping frame structure of the carbon fiber electric vehicle lower tube inner wall smoothing forming device described in this utility model. Detailed Implementation
[0017] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:
[0018] Example 1:
[0019] A device for smoothing the inner wall of the lower tube of a carbon fiber electric vehicle includes a forming worktable 01 and an auxiliary clamping frame 03. The forming worktable 01 has two fixed upright plates 02 on its upper part, symmetrically arranged. The auxiliary clamping frame 03 is connected inside the fixed upright plates 02 and slides within them. The fixed upright plates 02 have two positioning connection holes 15, symmetrically arranged. A first adjusting handwheel 04 is threadedly connected inside the auxiliary clamping frame 03. One end of the first adjusting handwheel 04 passes through the auxiliary clamping frame 03 and connects to the fixed upright plate 02, rotating within the fixed upright plate 02. Two supporting slide rods 05 are symmetrically arranged on one side of the auxiliary clamping frame 03, with the outer side of each supporting slide rod connected to the positioning connection hole 15, allowing the supporting slide rods 05 to slide within the positioning connection hole 15.
[0020] In this utility model, one end of the support slide rod 05 passes through the positioning connection hole 15 and connects to the adjustment bracket 06. The lower part of the adjustment bracket 06 is connected to the forming worktable 01. The adjustment bracket 06 slides on the forming worktable 01. The bottom of the adjustment bracket 06 has a positioning protrusion 21. The upper part of the forming worktable 01 has multiple positioning slide grooves 16. The positioning slide grooves 16 are symmetrically arranged. The positioning protrusion 21 is connected to the inner side of the positioning slide groove 16. The positioning protrusion 21 slides in the positioning slide groove 16.
[0021] The upper part of the adjustable bracket 06 of this utility model has an auxiliary connecting plate 20, and the lower part of the adjustable bracket 06 has a support plate 19. The auxiliary connecting plate 20 is connected to a second adjusting handwheel 07 by a thread. The lower part of the second adjusting handwheel 07 passes through the auxiliary connecting plate 20 and is connected to a fastening pressure plate 08. The side wall of the adjustable bracket 06 has an adjusting groove 18. The fastening pressure plate 08 is connected to the inner side of the adjusting groove 18 and slides within the adjusting groove 18.
[0022] The upper part of the fastening pressure plate 08 of this utility model is connected to two springs 22, which are symmetrically arranged. The outer side of the springs 22 is connected to the adjusting slide groove 18, and the springs 22 slide within the adjusting slide groove 18. The outer side of the carbon fiber lower tube 09 is connected to multiple adjusting brackets 06, and the lower part of the carbon fiber lower tube 09 is connected to multiple support plates 19. The upper part of the support plates 19 is connected to multiple fastening pressure plates 08. The inner side of the carbon fiber lower tube 09 is connected to a silicone tube 10, and the inner side of the silicone tube 10 is connected to an air bag 11. One end of the air bag 11 has an air inlet 17, and the other end of the air bag 11 has an exhaust port 14. The inner side of the air inlet 17 is connected to an auxiliary connecting pipe 12, and the other end of the auxiliary connecting pipe 12 is connected to the air outlet of an air pump 13. The bottom of the air pump 13 is connected to the molding worktable 01. The auxiliary clamping frame 03 clamps the carbon fiber lower tube 09. The auxiliary clamping frame 03 fixes and tightens the carbon fiber lower tube 09, preventing the inner wall of the carbon fiber lower tube 09 from shaking during the molding process, making the overall structure more stable. The air bag 11 inflates and expands to squeeze the silicone tube 10. The silicone tube 10 expands outward under force to squeeze the inside of the carbon fiber lower tube 09. During molding, the high pressure makes the smooth surface of the silicone tube 10 squeeze the carbon fiber lower tube 09, making the inner surface smoother. The smooth inner wall makes it easier to assemble the battery, avoids jamming, improves vehicle assembly efficiency, and the smooth surface makes the inner wall of the product more beautiful.
[0023] Installation steps: First, create an embedded silicone tube 10 according to the inner wall shape of the carbon fiber lower tube 09. During pre-forming, use the silicone tube 10 to encase the air bag 11 and place it into the carbon fiber lower tube 09 according to the standard. Then, fix the carbon fiber lower tube 09 onto the auxiliary clamping frame 03. The auxiliary clamping frame 03 clamps the carbon fiber lower tube 09, providing fixation and tightening to prevent the inner wall of the carbon fiber lower tube 09 from shaking during the forming process, making the overall structure more stable. Next, connect the air inlet 17 at one end of the air bag 11 to the auxiliary connecting pipe 12. Turn on the air pump 13. The air pump 13 inflates the air bag 11 through the auxiliary connecting pipe 12. The inflation and expansion of the air bag 11 affects the silicone... The silicone tube 10 is compressed, and the silicone tube 10 expands outward under force to compress the inside of the carbon fiber lower tube 09. During molding, the smooth surface of the silicone tube 10 is pressed against the carbon fiber lower tube 09 under high pressure, making the inner surface smoother. The smooth inner wall of the carbon fiber lower tube makes it easier to assemble the battery, avoids jamming, and improves vehicle assembly efficiency. The smooth surface makes the inner wall of the product more beautiful. After the inner wall of the carbon fiber lower tube 09 is formed, the air pump 13 is turned off, and the exhaust port 14 at the other end of the air bag 11 is opened. The gas inside the air bag 11 is discharged through the exhaust port 14. Then, the air bag 11 and silicone tube 10 are taken out in sequence, and the carbon fiber lower tube 09 is removed from the auxiliary clamp 03. The carbon fiber lower tube 09 completes the entire molding process.
[0024] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A device for smoothing the inner wall of the lower tube of a carbon fiber electric vehicle, characterized in that... The device includes a forming worktable (01) and an auxiliary clamping frame (03). The forming worktable (01) has two fixed upright plates (02) on its upper part. The fixed upright plates (02) are symmetrically arranged. The auxiliary clamping frame (03) is connected inside the fixed upright plates (02). The auxiliary clamping frame (03) slides inside the fixed upright plates (02). The fixed upright plates (02) have two positioning connection holes (15) inside. The positioning connection holes (15) are symmetrically arranged. The auxiliary clamping frame (03) is connected to a first adjusting handwheel (04) through a thread. One end of the first adjusting handwheel (04) passes through the auxiliary clamping frame (03) and connects to the fixed upright plates (02). The first adjusting handwheel (04) rotates inside the fixed upright plates (02). The auxiliary clamping frame (03) has two supporting slide rods (05) on one side. The supporting slide rods (05) are symmetrically arranged. The outer side of the supporting slide rods (05) is connected to the positioning connection holes (15). The supporting slide rods (05) slide inside the positioning connection holes (15).
2. The carbon fiber electric vehicle lower tube inner wall smoothing forming device according to claim 1, characterized in that: One end of the support slide rod (05) passes through the positioning connection hole (15) and connects to the adjustment bracket (06). The lower part of the adjustment bracket (06) is connected to the forming worktable (01). The adjustment bracket (06) slides on the forming worktable (01). The bottom of the adjustment bracket (06) has a positioning protrusion (21). The upper part of the forming worktable (01) has multiple positioning slide grooves (16). The positioning slide grooves (16) are symmetrically arranged. The inner side of the positioning slide groove (16) is connected to the positioning protrusion (21). The positioning protrusion (21) slides in the positioning slide groove (16).
3. The carbon fiber electric vehicle lower tube inner wall smoothing forming device according to claim 2, characterized in that: The upper part of the adjustment bracket (06) has an auxiliary connecting plate (20), and the lower part of the adjustment bracket (06) has a support plate (19). The auxiliary connecting plate (20) is connected to the second adjustment handwheel (07) by a thread. The lower part of the second adjustment handwheel (07) passes through the auxiliary connecting plate (20) and is connected to the fastening pressure plate (08). The side wall of the adjustment bracket (06) has an adjustment groove (18). The fastening pressure plate (08) is connected to the inner side of the adjustment groove (18). The fastening pressure plate (08) slides in the adjustment groove (18).
4. The carbon fiber electric vehicle lower tube inner wall smoothing forming device according to claim 3, characterized in that: Two springs (22) are connected to the upper part of the fastening plate (08). The springs (22) are symmetrically arranged. The outer side of the springs (22) is connected to the adjusting slide (18). The springs (22) slide in the adjusting slide (18). Multiple adjusting brackets (06) are connected to the outer side of the carbon fiber lower tube (09). Multiple support plates (19) are connected to the lower part of the carbon fiber lower tube (09). Multiple fastening plates (08) are connected to the upper part of the support plates (19). Silicone tube (10) is connected to the inner side of the carbon fiber lower tube (09). Air bag (11) is connected to the inner side of the silicone tube (10). Air bag (11) has an air inlet (17) at one end and an exhaust port (14) at the other end. Auxiliary connecting pipe (12) is connected to the inner side of the air inlet (17). Air pump (13) has an exhaust port (14) at the other end. Auxiliary connecting pipe (12) is connected to the inner side of the air inlet (17). Air pump (13) has an exhaust port (01) at the other end. Molding worktable (01) is connected to the bottom of the air pump (13).