Bus bar surface defect detection device

Abstract

The invention relates to the technical field of bus bar defect detection, in particular to a bus bar surface defect detection device which comprises a distance regulation and control mechanism, a tin supplementing mechanism installed on the distance regulation and control mechanism, a mirror image detection mechanism installed on the distance regulation and control mechanism and a boosting scraping mechanism installed in the mirror image detection mechanism. And the spacing regulation and control mechanism comprises a clamp, two rectangular sleeves mounted on the clamp, and two positioning pieces movably mounted in the two rectangular sleeves. A double-sided mirror image detection mechanism is provided for a bus bar body passing through a tin liquid pool, symmetric optical detection on the top surface and the bottom surface of the bus bar is utilized, once a tin layer on the surface of the bus bar has a bulge, an instruction of the mirror image detection mechanism is received, and then a motor is started through external control equipment; and the compression-resistant and slow-transmission bus bar can be scraped by the two scrapers, so that the device can be ensured to clean and trim the tin bar raised on the bus bar.

Description

Technical Field

[0001] The invention relates to the technical field of busbar defect detection, and in particular to a busbar surface defect detection device. Background Art

[0002] The busbar is mainly based on copper strip, and tin is coated on the surface of the copper strip, so it is also called photovoltaic welding strip. It is mainly used for connecting the battery cells of broadband modules and plays a conductive role.

[0003] The quality of the busbar directly affects the current collection efficiency of the photovoltaic module. As the copper strip is extended into the tin liquid through the delivery assembly, when the copper strip is extended from the tin liquid, the tin liquid will be affected by gravity and condense along the surface of the copper strip, which will cause bulges or pits in the tin layer.

[0004] In view of the above, the present invention designs a busbar surface defect detection device to solve the above problems. Summary of the invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technology.

[0006] To this end, the technical solution adopted in the present invention is: A busbar surface defect detection device comprises a spacing control mechanism, a tin supplement mechanism installed on the spacing control mechanism, a mirror detection mechanism installed on the spacing control mechanism, and a boosting scraping mechanism installed in the mirror detection mechanism; The spacing adjustment mechanism comprises a fixture, two rectangular sleeves mounted on the fixture, two positioning members movably mounted in the two rectangular sleeves, and a linkage shaft movably mounted in the two positioning members, and a locking bolt is movably mounted at one end of the rectangular sleeve; The tin replenishing mechanism comprises two columns mounted on the fixture and a tin storage bin fixedly mounted on the two columns; The mirror detection mechanism includes two optical detection heads and two sets of first and second sealing covers installed outside the two optical detection heads; The scraping assisting mechanism comprises an active delivery roller and a passive delivery roller movably installed in two adjacent first and second covers, a chain drivingly connected to the active delivery roller and the passive delivery roller, a guide rod arranged in the adjacent second cover and the first cover, and a scraper installed outside the guide rod.

[0007] In a preferred example, the present invention can be further configured as follows: the clamp is composed of an extended support plate and an end tube, and a telescopic tube is fixedly installed in the end tube, and a spring and two support rods movably installed at the top and bottom of the telescopic tube are installed inside the telescopic tube; A gasket and a clamp are installed at one end of the support rod away from the telescopic tube.

[0008] In a preferred example, the present invention can be further configured as follows: the spacing control mechanism further includes a hydraulic rod installed outside the end tube; Two traction members are movably mounted on the outer ends of the hydraulic sub-rods in the hydraulic rods, and the other ends of the traction members are movably mounted on the clamps.

[0009] In a preferred example, the present invention can be further configured as follows: the tin replenishing mechanism also includes a tin injection tube fixedly installed on the top of the tin storage bin, a wheel shaft installed inside the tin storage bin, a wheel movably installed outside the wheel shaft and located inside the tin storage bin, and a convergence belt that penetrates into the tin storage bin and fits in the outer ring groove of the wheel.

[0010] In a preferred example, the present invention can be further configured as follows: an annular groove that is recessed inward and guides the tin liquid to flow into the top surface of the busbar is provided on the outside of the rotating wheel.

[0011] In a preferred example, the present invention can be further configured as follows: the mirror detection mechanism further includes a clamping seat mounted on the outside of the optical detection head, a plurality of auxiliary rotation shafts movably mounted in adjacent first and second sealing covers, and an auxiliary sleeve roller mounted on the outside of the auxiliary rotation shafts; One end of the support rod away from the telescopic tube is adapted to penetrate into the end head outside the clamp seat.

[0012] In a preferred example, the present invention can be further configured as follows: the mirror detection mechanism further comprises four pads, and a hexagonal nut is installed in the middle of the pad, and a propulsion assembly is movably installed inside the hexagonal nut; The propulsion assembly consists of a screw rod, a hexagonal nut and an I-shaped end head.

[0013] In a preferred example, the present invention can be further configured as follows: the scraping assisting mechanism further includes a chassis fixedly mounted on a first cover at the bottom thereof and a motor fixedly mounted in the chassis.

[0014] In a preferred example, the present invention can be further configured as follows: the active delivery roller is composed of a first linkage shaft, a first pressure roller and a first gear, and one end of the first linkage shaft away from the first gear is fixed to the transmission shaft in the motor; The passive delivery roller is composed of a second linkage shaft, a second pressure roller and a second gear; The linkage shaft is transmitted to the first gear and the second gear through a chain.

[0015] In a preferred example, the present invention can be further configured as follows: the scraping assisting mechanism further includes two sets of supporting frames, and the supporting frames are in an L-shaped structure as a whole; The bearing frame is composed of an elliptical baffle, an insert rod and an end plate, and the I-shaped end head is movably installed in the end plate.

[0016] By adopting the above technical solution, the beneficial effects achieved by the present invention are: 1. The present invention provides a double-sided mirror detection mechanism on the busbar body after passing through the tin liquid pool, and utilizes the symmetrical optical detection of the top and bottom surfaces of the busbar. Once there are bulges on the tin layer on the surface of the busbar, the motor is started by the command of the mirror detection mechanism through an external control device, and the pressure-resistant and slowly transmitted busbar can be scraped by two scrapers, thereby ensuring that the device can clean and trim the bulges of tin on the busbar.

[0017] 2. The present invention limits the delivery of the bus tape. When there are defects in the tin layer on the surface of the bus tape, the bus tape that is delivered at a uniform speed can be delivered to the tin storage bin. At this time, the tin liquid can quickly fill the defective parts on the top surface of the bus tape, and finally the bus tape is limited by the outlet of the tin storage bin, thereby ensuring that the bus tape after being coated with tin liquid can be accurately repaired, while avoiding excessive tin liquid from accumulating on the surface of the bus tape due to gravity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the present invention when used; Figure 2 It is a three-dimensional bottom view schematic diagram of the present invention; Figure 3 It is a schematic diagram of the spacing control mechanism and the tin supplement mechanism of the present invention; Figure 4 It is a cross-sectional schematic diagram of the spacing adjustment mechanism and the tin supplementation mechanism of the present invention; Figure 5 For the present invention Figure 4 The enlarged schematic diagram of point A in the middle; Figure 6 It is a dispersed schematic diagram of the mirror image detection mechanism of the present invention; Figure 7 For the present invention Figure 6 The enlarged schematic diagram of point B in the middle; Figure 8 It is a schematic diagram of the scraping mechanism of the present invention; Fig. 9 For the present invention Figure 8 Enlarged schematic diagram of point C in the middle.

[0019] Reference numerals: 100, spacing control mechanism; 110, clamp; 120, hydraulic rod; 130, telescopic tube; 140, spring; 150, support rod; 160, traction member; 170, rectangular sleeve; 180, positioning member; 190, linkage shaft; 200, tin replenishing mechanism; 210, column; 220, tin storage bin; 230, rotating wheel shaft; 240, rotating wheel; 250, tin injection tube; 260, converging belt; 300, mirror detection mechanism; 310, clamping seat; 320, optical detection head; 330, first cover; 340, second cover; 350, auxiliary rotation shaft; 360, auxiliary sleeve roller; 370, pad; 380, propulsion assembly; 400, scraper assisting mechanism; 410, chassis; 420, motor; 430, active delivery roller; 440, passive delivery roller; 450, carrier frame; 460, guide rod; 470, scraper; 480, chain. DETAILED DESCRIPTION

[0020] To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementations and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0021] It is to be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention.

[0022] A busbar surface defect detection device provided by some embodiments of the present invention will be described below in conjunction with the accompanying drawings. Embodiment 1:

[0023] Combination Figure 1-Figure 9 As shown, a busbar surface defect detection device provided by the present invention includes a spacing adjustment mechanism 100, a tin replenishing mechanism 200 installed on the spacing adjustment mechanism 100, a mirror detection mechanism 300 installed on the spacing adjustment mechanism 100, and a scraper assisting mechanism 400 installed in the mirror detection mechanism 300.

[0024] The spacing control mechanism 100 includes a clamp 110, a hydraulic rod 120, a telescopic tube 130, a spring 140, a strut 150, a traction member 160, a rectangular sleeve 170, a positioning member 180 and a linkage shaft 190. The tin replenishing mechanism 200 includes a column 210, a tin storage bin 220, a rotating wheel shaft 230, a rotating wheel 240, a tin injection tube 250 and a convergence belt 260. The mirror detection mechanism 300 includes a clamp seat 310, an optical detection head 320, a first cover 330, a second cover 340, an auxiliary rotating shaft 350, an auxiliary sleeve roller 360, a pad 370 and a propulsion assembly 380. The auxiliary scraping mechanism 400 includes a chassis 410, a motor 420, an active delivery roller 430, a passive delivery roller 440, a carrier frame 450, a guide rod 460, a scraper 470 and a chain 480.

[0025] The spacing adjustment mechanism 100 includes a fixture 110, two rectangular sleeves 170 mounted on the fixture 110, two positioning members 180 movably mounted in the two rectangular sleeves 170, and a linkage shaft 190 movably mounted in the two positioning members 180, and a locking bolt is movably mounted at one end of the rectangular sleeve 170; The tin replenishing mechanism 200 includes two columns 210 installed on the fixture 110, a tin storage bin 220 fixedly installed on the two columns 210, a tin injection tube 250 fixedly installed on the top of the tin storage bin 220, a rotating wheel shaft 230 installed inside the tin storage bin 220, a rotating wheel 240 movably installed outside the rotating wheel shaft 230 and located inside the tin storage bin 220, and a converging belt 260 that penetrates into the tin storage bin 220 and fits in the outer ring groove of the rotating wheel 240; The outer portion of the rotating wheel 240 is provided with an annular groove which is concave inwards and guides the tin liquid to flow into the top surface of the busbar 260; The mirror detection mechanism 300 includes two optical detection heads 320 and two sets of first covers 330 and second covers 340 installed outside the two optical detection heads 320; The scraper-assisting mechanism 400 includes an active delivery roller 430 and a passive delivery roller 440 movably installed in two adjacent first covers 330 and second covers 340, a chain 480 transmission-connected to the active delivery roller 430 and the passive delivery roller 440, a guide rod 460 arranged in the adjacent second covers 340 and first covers 330, and a scraper 470 installed outside the guide rod 460.

[0026] Since the busbar uses copper strip as the base material, the copper strip is pulled by a delivery device. When the copper strip is immersed in the tin liquid and stretched outward, the surface of the copper strip can be coated with a tin layer. However, the moment it is extended from the tin pool, the tin liquid will accumulate on the surface of the copper strip in a short period of time due to the influence of gravity, and then form a bulge after solidification. In severe cases, it will cause a concave hole defect in the tin layer. The busbar body is small in size, and conventional detection methods cannot detect the precise specifications of the busbar. At the same time, the bulges and defects of the tin layer are also difficult to detect.

[0027] The device is used in conjunction with the tinned busbar. When the tinned busbar 260 passes through the gap between the multiple groups of auxiliary rollers 360, the multiple groups of auxiliary rollers 360 distributed symmetrically can provide sufficiently stable roller pressure for the delivery of the busbar 260. When the two optical inspection heads 320 arranged in the middle of the two groups of first covers 330 and the second covers 340 perform synchronous optical inspection on the top and bottom surfaces of the busbar 260, once there is a bulge on the surface of the busbar 260, the motor 420 will actively drive the active delivery roller 430 through the control of the external control device, and then cooperate with the chain 480 to drive the passive delivery roller 440 and the linkage shaft 190. At this time, the linkage The active delivery roller 430 and the passive delivery roller 440 can roll the tin layer on the top and bottom surfaces of the bus tape 260. At this time, the raised tin blocks can be initially rolled to a flat state. After the bus tape 260 passes through the blades of the two scrapers 470, the raised tin blocks that have not been rolled flat can be flattened. Once there are defects on the surface of the bus tape 260, the pulled bus tape 260 can enter the inner cavity of the tin storage bin 220, and with the help of the rotating wheel 240 to fit the top surface of the bus tape 260, the tin liquid will eventually fill the defective parts of the defective tin layer on the top surface of the bus tape 260, and under the limiting effect of the outlet of the tin storage bin 220, the repaired bus tape 260 can be flattened. Embodiment 2:

[0028] Combination Figure 3-Figure 6 As shown, based on the first embodiment, the spacing control mechanism 100 further includes a hydraulic rod 120 installed outside the end pipe; The clamp 110 is composed of an extended support plate and an end tube, and a telescopic tube 130 is fixedly installed in the end tube. A spring 140 and two support rods 150 movably installed at the top and bottom of the telescopic tube 130 are installed inside the telescopic tube 130. A gasket and a clamp are installed at one end of the support rod 150 away from the telescopic tube 130; Two traction members 160 are movably mounted on the outer ends of the hydraulic sub-rods in the hydraulic rod member 120, and the other ends of the traction members 160 are movably mounted on the clamping head.

[0029] By fixing the telescopic tube 130 in the end tube in the clamp 110, when the hydraulic rod 120 is running, the internal hydraulic sub-rod will simultaneously pull the two traction members 160 to stretch, and then push the two support rods 150 to expand. At this time, the two clamp seats 310 installed at the outer ends of the two support rods 150 can drive the two optical inspection heads 320 to approach the top and bottom surfaces of the busbar 260. As the external winding device pulls the busbar 260, it is rolled and delivered by multiple groups of auxiliary rollers 360. At this time, the busbar 260 that is continuously delivered in a stable state can be optically inspected on both sides by the two optical inspection heads 320, so that the tin blocks and defects on the surface of the busbar 260 can be quickly detected. Embodiment three:

[0030] Combination Figure 3-Figure 8 As shown, based on the first embodiment, the mirror detection mechanism 300 further includes four pads 370, a clamping seat 310 installed outside the optical detection head 320, a plurality of auxiliary rotation shafts 350 movably installed in adjacent first and second covers 330 and 340, and an auxiliary sleeve roller 360 installed outside the auxiliary rotation shafts 350; One end of the support rod 150 away from the telescopic tube 130 is adapted to penetrate into the end of the clamp seat 310; A hexagonal nut is installed in the middle of the backing plate 370, and a driving assembly 380 is movably installed inside the hexagonal nut; The propulsion assembly 380 is composed of a screw rod, a hexagonal nut and an I-shaped end.

[0031] The two adjacent first covers 330 and the second covers 340 are combined by using a plurality of bolts. At this time, a plurality of auxiliary rotation shafts 350 can be movably installed between the first cover 330 and the second cover 340. At this time, the auxiliary rollers 360 installed on the outside of the auxiliary rotation shafts 350 can provide a stable delivery auxiliary rotation thrust to the tin layer on the surface of the busbar 260. As the busbar 260 continues to stretch, the plurality of groups of auxiliary rollers 360 can prevent the busbar 260 from shaking during the mirror detection. Finally, the active delivery roller 430 and the passive delivery roller 440 can perform preliminary rolling to flatten the bulge, and at the same time, the two scrapers 470 can conveniently remove the preliminary flattened bulge. Embodiment 4:

[0032] Combination Figure 2-Figure 9 As shown, based on the first embodiment, the scraping mechanism 400 further includes two sets of carriers 450, a chassis 410 fixedly mounted on a first cover 330 at the bottom thereof, and a motor 420 fixedly mounted in the chassis 410; The active delivery roller 430 is composed of a first linkage shaft, a first pressure roller and a first gear, and one end of the first linkage shaft away from the first gear is fixed to the transmission shaft in the motor 420; The passive delivery roller 440 is composed of a second linkage shaft, a second pressure roller and a second gear; The linkage shaft 190 is transmitted to the first gear and the second gear through the chain 480; The supporting frame 450 is an L-shaped structure as a whole, and the supporting frame 450 is composed of an elliptical baffle, a plug rod and an end plate, and the I-shaped end head is movably installed in the end plate.

[0033] By movably installing the end plate in the support frame 450 outside the I-shaped end head, when the hexagonal nut in the propulsion assembly 380 is controlled to rotate, the propulsion assembly 380 will be stably lifted and lowered in the pad 370. At this time, the tractioned support frame 450 will drive the guide rod 460 to lift and lower, and a slideway is provided inside the adjacent first cover 330 and the second cover 340. As the guide rod 460 is lifted and lowered along the slideway, the scraper 470 installed outside the guide rod 460 can adjust the spacing of the tin layer on the surface of the busbar 260, so that the raised bulges of the tin layer on the surface of the busbar 260 can be quickly removed.

[0034] The working principle and use process of the present invention are as follows: the chassis 410 is fixedly installed on a first cover 330 at the bottom in advance, and then the motor 420 is fixedly installed in the chassis 410. At this time, the active delivery roller 430 is movably installed in a group of first covers 330 and second covers 340 at the bottom, and the passive delivery roller 440 is movably installed in another group of first covers 330 and second covers 340 at the top, and the gear transmission on the adjacent ends of the active delivery roller 430 and the passive delivery roller 440 is connected with a chain 480. At this time, the other end of the chain 480 is connected to the linkage shaft 190, and the scraper 470 is fixedly installed on the guide rod 460. At this time, the two ends of the guide rod 460 respectively penetrate the outer sides of the adjacent first covers 330 and second covers 340. The two carriers 450 arranged inside the first cover 330 and the second cover 340 will position and clamp the two ends of the guide rod 460, and the four pads 370 are respectively installed on the outside of the two first covers 330 and the two second covers 340, and the four propulsion assemblies 380 are respectively installed in the four pads 370. At this time, the end of the propulsion assembly 380 with an I-shaped structure is movably installed in the end plate at the outer end of the carrier 450. When the propulsion assembly 380 is rotated, the propulsion assembly 380 that rises and falls along the inside of the pad 370 can drive the carrier 450 to rise and fall along the elliptical channel reserved inside the first cover 330 and the second cover 340, and the two adjacent scrapers 470 can limit and adjust the passing converging strip 260; When in use, the bus strip 260 is delivered in advance along the gap between the multiple groups of auxiliary rollers 360 until the bus strip 260 passes through the active delivery roller 430 and the passive delivery roller 440. The active delivery roller 430 and the passive delivery roller 440 can roll the raised tin blocks on the surface of the bus strip 260 to an initial flat state. At this time, the two optical inspection heads 320 arranged in the middle of the two groups of first covers 330 and the second covers 340 can perform optical inspection on the top and bottom surfaces of the bus strip 260. When there are bulges on the tin on the surface of the bus strip 260, the two scrapers 470 with adjusted spacing can optically capture the bulges on the surface of the bus strip 260 through the optical capture of the other two optical inspection heads 320. The tin blocks are scraped off. When there are concave holes or defects in the tin layer on the surface of the bus belt 260, as the bus belt 260 is continuously delivered, it will eventually enter the inner cavity of the tin storage bin 220, and under the limiting and assisting action of the rotating wheel 240, the molten tin liquid will quickly adhere to the surface defects of the bus belt 260. When the bus belt 260 extends from the outlet of the tin storage bin 220, it is limited by the outlet of the tin storage bin 220 on the surface of the bus belt 260. At this time, the tin liquid stored in the surface defects of the bus belt 260 can be scraped off. At this time, the device can perform double-sided mirror optical inspection on the bus belt, and can also trim and fill the raised tin blocks or defects on the surface of the bus belt 260.

[0035] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A busbar surface defect detection device, comprising a spacing control mechanism (100), characterized in that: It also includes a tin-filling mechanism (200) installed on the spacing adjustment mechanism (100), a mirror image detection mechanism (300) installed on the spacing adjustment mechanism (100), and a material-scraping assisting mechanism (400) installed in the mirror image detection mechanism (300); The spacing adjustment mechanism (100) comprises a clamp (110), two rectangular sleeves (170) mounted on the clamp (110), two positioning members (180) movably mounted in the two rectangular sleeves (170), and a linkage shaft (190) movably mounted in the two positioning members (180), and a locking bolt is movably mounted on one end of the rectangular sleeve (170); The tin replenishing mechanism (200) comprises two columns (210) mounted on the fixture (110), a tin storage bin (220) fixedly mounted on the two columns (210), a tin injection tube (250) fixedly mounted on the top of the tin storage bin (220), a rotating wheel shaft (230) mounted inside the tin storage bin (220), a rotating wheel (240) movably mounted outside the rotating wheel shaft (230) and located inside the tin storage bin (220), and a converging belt (260) penetrating into the interior of the tin storage bin (220) and fitting into an outer annular groove of the rotating wheel (240); The mirror detection mechanism (300) comprises two optical detection heads (320), two sets of first covers (330) and second covers (340) installed outside the two optical detection heads (320), a clamping seat (310) installed outside the optical detection heads (320), a plurality of auxiliary rotation shafts (350) movably installed in adjacent first covers (330) and second covers (340), and an auxiliary sleeve roller (360) installed outside the auxiliary rotation shafts (350); The scraping assisting mechanism (400) comprises an active delivery roller (430) and a passive delivery roller (440) movably mounted in two adjacent first covers (330) and a second cover (340), a chain (480) drivingly connected to the active delivery roller (430) and the passive delivery roller (440), a guide rod (460) disposed in the adjacent second covers (340) and the first covers (330), and a scraper (470) mounted outside the guide rod (460).

2. A busbar surface defect detection device according to claim 1, characterized in that: The clamp (110) is composed of an extended support plate and an end tube, and a telescopic tube (130) is fixedly installed in the end tube. A spring (140) and two support rods (150) movably installed at the top and bottom of the telescopic tube (130) are installed inside the telescopic tube (130); A gasket and a clamp are installed at one end of the support rod (150) away from the telescopic tube (130).

3. A busbar surface defect detection device according to claim 2, characterized in that: The spacing control mechanism (100) further comprises a hydraulic rod (120) installed outside the end pipe; Two traction members (160) are movably mounted on the outer end of the hydraulic sub-rod in the hydraulic rod member (120), and the other end of the traction member (160) is movably mounted on the clamping head.

4. The busbar surface defect detection device according to claim 1, characterized in that: The outer portion of the rotating wheel (240) is provided with an annular groove which is recessed inwards and guides the tin liquid to flow into the top surface of the busbar (260).

5. The busbar surface defect detection device according to claim 2, characterized in that: One end of the support rod (150) away from the telescopic tube (130) is adapted to penetrate into an end head outside the clamp seat (310).

6. The busbar surface defect detection device according to claim 1, characterized in that: The mirror image detection mechanism (300) further comprises four pads (370), wherein a hexagonal nut is installed in the middle of the pad (370), and a propulsion assembly (380) is movably installed inside the hexagonal nut; The propulsion assembly (380) is composed of a screw rod, a hexagonal nut, and an I-shaped end.

7. The busbar surface defect detection device according to claim 1, characterized in that: The scraping-assisting mechanism (400) further comprises a case (410) fixedly mounted on a first cover (330) disposed at the bottom thereof, and a motor (420) fixedly mounted in the case (410).

8. The busbar surface defect detection device according to claim 1, characterized in that: The active delivery roller (430) is composed of a first linkage shaft, a first pressure roller, and a first gear, and one end of the first linkage shaft away from the first gear is fixed to a transmission shaft in the motor (420); The passive delivery roller (440) is composed of a second linkage shaft, a second pressure roller and a second gear; The linkage shaft (190) is driven to the first gear and the second gear via a chain (480).

9. The busbar surface defect detection device according to claim 6, characterized in that: The scraping assisting mechanism (400) further comprises two groups of supporting frames (450), and the supporting frames (450) are in an L-shaped structure as a whole; The support frame (450) is composed of an elliptical baffle, an insert rod and an end plate, and the I-shaped end head is movably installed in the end plate.

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