An automobile parts welding device

Abstract

The application discloses a kind of automobile parts welding devices, it is related to automobile parts processing technical field, including positioning mechanism, splicing mechanism and retaining mechanism.Positioning mechanism is provided with a pair of reversible, can be translated suction box, for carrying and adsorbing two half shells;Splicing mechanism is arranged below suction box, with hydraulic cylinder as power source, by gear transmission mechanism and plane link mechanism driven in turn, time sequence drive half shell overturn, fold, and the bottom of assembly plate is completed synchronous docking;Retaining mechanism is arranged above, is provided with a plurality of vacuum chuck's suction box, can adsorb fixed after splicing all workpieces and drive it to rotate.The application realizes the synchronous splicing of multiple workpieces by single power source, cooperates with rotatable adsorption retaining structure, can complete annular weld welding without secondary clamping, effectively improves splicing precision and welding efficiency, reduces workpiece clamping damage.

Description

Technical Field

[0001] This invention relates to the technical field of automotive parts, and more specifically to a welding device for automotive parts. Background Technology

[0002] The automotive energy-absorbing box is a core buffer component in the automotive passive safety system. It is usually formed by welding two half-shells and a bottom assembly plate. The precision of its splicing and welding directly affects the vehicle's collision energy absorption performance and the precision of the front assembly.

[0003] Currently, the welding of energy-absorbing boxes mostly adopts a step-by-step clamping process: first, the two halves of the shell are aligned and clamped using a fixture, then the bottom assembly plate is manually assembled and fixed a second time, and finally the weld is completed section by section. This method has the following drawbacks: First, multiple clamping can easily lead to cumulative positioning errors, making it difficult to guarantee the splicing alignment accuracy, and easily resulting in uneven weld gaps and insufficient weld strength; Second, the flipping, closing and docking of the half-shell with the assembly plate are mostly driven by independent power, resulting in poor synchronization of actions, complex transmission structures, and high equipment failure rates; Third, when welding circumferential ring welds, manual flipping or multiple clamp changes are required, resulting in low production efficiency, high labor intensity, and difficulty in adapting to automated mass production; Fourth, traditional mechanical hard clamping can easily cause pressure damage and deformation to the surface of thin-walled workpieces, affecting the product's appearance and dimensional consistency. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a welding device for automotive parts. Through the integrated positioning, splicing and holding mechanism linkage design, a single power source sequentially drives the half-shell to flip, close and synchronously dock with the assembly plate. Combined with a rotatable vacuum adsorption holding structure, it can complete the precise splicing of the energy-absorbing box and continuous welding of the circumferential weld in one go, effectively improving welding accuracy and production efficiency, and reducing workpiece clamping damage.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An automotive parts welding apparatus, comprising: The positioning mechanism includes a pair of adsorption boxes, which are respectively used to horizontally support and adsorb half-shell one and half-shell two of the car energy-absorbing box. The splicing mechanism is located below the pair of adsorption boxes and includes a hydraulic cylinder and multiple positioning pins. The positioning pins are used to horizontally position the assembly plate of the automotive energy-absorbing box. The hydraulic cylinder drives the first half-shell and the second half-shell to move closer to each other and align and splice through a gear transmission mechanism and a planar linkage mechanism connected in sequence, while simultaneously driving the assembly plate to dock synchronously to the bottom of the first half-shell and the second half-shell. The retaining mechanism is located above the pair of adsorption boxes and includes an air suction box. Vacuum suction cups 1 are provided on the left and right sides of the air suction box, and vacuum suction cup 2 is provided at the bottom. Vacuum suction cups 1 on both sides are used to adsorb and fix half shell 1 and half shell 2 to the corresponding sides of the air suction box, and vacuum suction cup 2 is used to adsorb and fix the assembly plate to the lower side of the air suction box.

[0006] Preferably, the positioning mechanism further includes a support plate, on the lower side of which multiple support feet are evenly installed, and support bars are vertically fixed on its left and right sides. A C-shaped support frame is connected to the upper part of the support bars. Linear guide rails are horizontally installed on the front and rear sides of the support frame. A slider is slidably fitted on the linear guide rails, and a sliding plate is connected to the slider. A rotating shaft is rotatably connected between the front and rear sliding plates. A rotating plate is fixedly connected to the rotating shaft. The adsorption box is horizontally installed on the upper side of the rotating plate. The upper surface of the adsorption box is provided with a positioning groove that matches the outer surface of half-shell one or half-shell two. Multiple adsorption holes are evenly distributed at the bottom of the positioning groove. Multiple suction pipes are connected to the side of the adsorption box.

[0007] Furthermore, a tension spring is connected between the rotating shaft and the support frame.

[0008] Preferably, the hydraulic cylinder is vertically installed on the upper side of the support plate, and its piston rod is connected upward to a lifting bar; an X-shaped lifting frame is coaxially connected above the lifting bar via a compression spring, and multiple positioning pins are vertically connected to the middle of the lifting frame; linear guide rails are horizontally installed on the left and right sides of the lifting frame, and sliders are slidably fitted on the linear guide rails, with sliding frames connected to the sliders.

[0009] Furthermore, a sliding bar is vertically connected to the upper side of the sliding frame, and a rack is vertically connected to the sliding bar; a gear is installed at the end of the rotating shaft, and the gear meshes with the rack on the corresponding side.

[0010] Furthermore, a second sliding bar is vertically connected to the lower side of the sliding frame, and the second sliding bar is hinged to the lifting bar via a hinge bar.

[0011] Furthermore, guide posts are vertically connected to the front and rear sides of the lifting frame, and the guide posts slide in cooperation with the lifting bar through guide sleeves.

[0012] Preferably, the holding mechanism further includes a dual-axis cylinder and a servo motor; the dual-axis cylinder is vertically mounted between two support bars via a fixing plate, and its piston rod is connected downward to a lifting plate; the servo motor is vertically mounted on the lifting plate, and its output shaft is connected to the air intake box via a flange; multiple air intake pipes are connected to the upper side of the air intake box.

[0013] Furthermore, photoelectric switches are installed on the left and right sides of the air intake box via sensor bracket one, respectively; and photoelectric switches are installed on the lower side of the air intake box via sensor bracket two.

[0014] Compared with the prior art, the present invention has the following advantages: 1. High splicing accuracy and good synchronization. Using a single hydraulic cylinder as the power source, the gear transmission mechanism and the planar linkage mechanism work together in sequence to complete the tilting and horizontal closing of the half-shell, while simultaneously achieving the bottom docking of the assembly plate. The mechanical structure rigidity ensures the synchronicity of the movement of multiple parts, eliminating the cumulative error of step-by-step clamping from the root, significantly improving the alignment and splicing accuracy of the energy-absorbing box, and ensuring uniform weld gaps and welding strength.

[0015] 2. High welding efficiency and high degree of process integration The holding mechanism can hold all workpieces in place at once by vacuum suction cup after splicing. The lower positioning and splicing mechanism can be reset synchronously to avoid welding space. With the help of servo motor to drive the workpiece to rotate as a whole, continuous welding of the circumferential weld between the half shell and the assembly plate can be completed without secondary clamping or manual flipping, which greatly shortens the process flow time and improves the efficiency of mass production.

[0016] 3. Minimal workpiece damage and high adaptability. The vacuum adsorption method replaces the traditional mechanical clamping to achieve workpiece positioning and fixation. The contact surface is subjected to uniform force, which can effectively avoid the problems of surface crushing and clamping deformation of thin-walled semi-shells, and ensure the appearance and dimensional accuracy of the product. At the same time, the contour positioning groove and the liftable holding structure can be adapted to various specifications of energy-absorbing box workpieces, making the device highly versatile.

[0017] 4. Compact structure, stable and reliable operation. This device integrates workpiece positioning, synchronous splicing, and rotary welding functions into one unit. Through linkage design, it reduces the number of power components, resulting in a compact overall layout and a short transmission chain. Equipped with spring buffers and guide rail structures, it can absorb operational impacts, eliminate transmission gaps, and ensure high equipment stability and low maintenance costs. It can be directly connected to automated welding production lines. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the overall front view of the present invention.

[0020] Figure 3 This is a three-dimensional structural diagram of the positioning mechanism.

[0021] Figure 4 This is a partial three-dimensional structural diagram of the positioning mechanism.

[0022] Figure 5 This is a three-dimensional structural diagram of the splicing mechanism.

[0023] Figure 6 This is a partial three-dimensional structural diagram of the splicing mechanism.

[0024] Figure 7 A schematic diagram of the structure to maintain the overall three-dimensional appearance of the mechanism.

[0025] Figure 8 A schematic diagram of the structure to maintain a local three-dimensional appearance.

[0026] Figure 9 This is a three-dimensional structural diagram of the car's energy-absorbing box.

[0027] in: 10-Positioning mechanism; 101-Support plate; 102-Support foot; 103-Support bar; 104-Support frame; 105-Linear guide rail one; 106-Slider one; 107-Sliding plate; 108-Rotating shaft; 109-Tension spring; 110-Rotating plate; 111-Adsorption box; 111a-Positioning groove; 111b-Adsorption hole; 112-Suction pipe one; 20-Assembly mechanism; 201-Hydraulic cylinder; 202-Lifting bar; 203-Compression spring; 204-Lifting frame; 205-Positioning pin; 206-Linear guide rail II; 207-Slider II; 208-Sliding frame; 209-Sliding bar I; 210-Rack; 211-Gear; 212-Sliding bar II; 213-Hinge bar; 214-Guide post; 215-Guide sleeve; 30-Holding mechanism; 301-Fixing plate; 302-Dual-axis cylinder; 303-Lifting plate; 304-Servo motor; 305-Flange; 306-Suction box; 307-Vacuum suction cup one; 308-Vacuum suction cup two; 309-Suction pipe two; 310-Sensor bracket one; 311-Photoelectric switch one; 312-Sensor bracket two; 313-Photoelectric switch two; 40 - Automotive energy-absorbing box; 401 - Semi-shell one; 402 - Semi-shell two; 403 - Assembly plate. Detailed Implementation

[0028] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0029] like Figures 1 to 9 As shown, this embodiment provides an automotive parts welding apparatus, including: The positioning mechanism 10 includes a pair of adsorption boxes 111, which are used to horizontally support and adsorb the first half shell 401 and the second half shell 402 of the car energy absorption box 40. The splicing mechanism 20 is located below the pair of adsorption boxes 111 and includes a hydraulic cylinder 201 and multiple positioning pins 205. The positioning pins 205 are used to horizontally position the assembly plate 403 of the automotive energy absorption box 40. The hydraulic cylinder 201 drives the first half-shell 401 and the second half-shell 402 to move closer to each other and align and splice through a gear transmission mechanism and a planar linkage mechanism connected in sequence. At the same time, it drives the assembly plate 403 to be synchronously docked to the bottom of the first half-shell 401 and the second half-shell 402. The retaining mechanism 30 is located above the pair of adsorption boxes 111 and includes an air suction box 306. Vacuum suction cups 307 are provided on the left and right sides of the air suction box 306, and vacuum suction cups 308 are provided at the bottom. The vacuum suction cups 307 on both sides are used to adsorb and fix the half shell 401 and the half shell 402 to the corresponding sides of the air suction box 306, and the vacuum suction cups 308 are used to adsorb and fix the assembly plate 403 to the lower side of the air suction box 306.

[0030] This device adopts an integrated structural design that combines positioning, splicing, and holding, which can complete the precise alignment and splicing fixation of the energy-absorbing box half shell and the assembly plate in one go, eliminating the need for multiple manual clamping and alignment, and effectively improving the assembly accuracy and production efficiency of the energy-absorbing box welding.

[0031] In this embodiment, the positioning mechanism 10 further includes a support plate 101. Multiple support feet 102 are evenly installed on the lower side of the support plate 101, and support bars 103 are vertically fixed on its left and right sides. A C-shaped support frame 104 is connected to the upper part of the support bars 103. Linear guide rails 105 are horizontally installed on the front and rear sides of the support frame 104. Slider blocks 106 are slidably fitted onto the linear guide rails 105, and sliding plates 107 are connected to the sliders 106. A rotating shaft 108 is rotatably connected between the sliding plates 107. A rotating plate 110 is fixedly connected to the rotating shaft 108. The adsorption box 111 is horizontally installed on the upper side of the rotating plate 110. The upper surface of the adsorption box 111 is provided with a positioning groove 111a that is adapted to the outer surface of the first half shell 401 or the second half shell 402. A plurality of adsorption holes 111b are evenly distributed at the bottom of the positioning groove 111a. A plurality of suction pipes 112 are connected to the side of the adsorption box 111.

[0032] Furthermore, a tension spring 109 is connected between the rotating shaft 108 and the support frame 104. The tension spring 109 can provide elastic tension during the device reset phase, driving the rotating shaft 108, rotating plate 110 and adsorption box 111 to automatically return to the initial position, making it easier to remove the finished product after welding; on the other hand, it can apply preload to the gear and rack pair during transmission to eliminate transmission backlash.

[0033] In this embodiment, the hydraulic cylinder 201 is vertically mounted on the upper side of the support plate 101, and its piston rod is connected upward to the lifting bar 202. An X-shaped lifting frame 204 is coaxially connected above the lifting bar 202 via a compression spring 203. Multiple positioning pins 205 are vertically connected to the middle of the lifting frame 204. Linear guide rails 206 are horizontally mounted on the left and right sides of the lifting frame 204. Sliding sliders 207 are slidably fitted onto the linear guide rails 206, and sliding frames 208 are connected to the sliding sliders 207. The compression spring 203 is positioned between the lifting bar 202 and the lifting frame 204, forming a flexible buffer structure. When the positioning pins 205 are inserted into the positioning holes of the assembly plate 403 and the lifting frame 204 is lifted into position, hard contact impact is avoided, protecting the workpiece and positioning pins from damage, while ensuring full fit between the positioning pins and the positioning holes.

[0034] Furthermore, a sliding bar 209 is vertically connected to the upper side of the sliding frame 208, and a rack 210 is vertically connected to the sliding bar 209; a gear 211 is installed at the end of the rotating shaft 108, and the gear 211 meshes with the rack 210 on the corresponding side. The rack 210 and the gear 211 constitute a gear transmission mechanism, which can convert the horizontal linear motion of the sliding frame 208 into the rotational motion of the rotating shaft 108, thereby driving the adsorption box 111 and the half-shell to complete the flipping and engagement action.

[0035] Furthermore, a second sliding bar 212 is vertically connected to the lower side of the sliding frame 208, and the second sliding bar 212 is hinged to the lifting bar 202 via a hinge bar 213. The second sliding bar 212 and the hinge bar 213 together form a planar linkage mechanism, which can convert the vertical lifting motion of the lifting bar 202 into the horizontal reciprocating motion of the sliding frame 208, realizing the synchronous action of the hydraulic cylinder 201 driving the half-shell to flip and move closer to the assembly plate 403 for lifting and docking simultaneously.

[0036] Furthermore, guide posts 214 are vertically connected to the front and rear sides of the lifting frame 204. The guide posts 214 are slidably engaged with the lifting bar 202 via guide sleeves 215. The guide posts 214 and guide sleeves 215 provide precise linear guidance for the vertical movement of the lifting frame 204, effectively preventing the lifting frame 204 from swaying or twisting during the lifting process, ensuring the positional accuracy and verticality of the multiple positioning pins 205, improving the positioning accuracy of the assembly plate 403, and making the lifting movement smoother, reducing operational impact and noise.

[0037] In this embodiment, the holding mechanism 30 further includes a dual-axis cylinder 302 and a servo motor 304. The dual-axis cylinder 302 is vertically mounted between two support bars 103 via a fixing plate 301, and its piston rod is connected downward to a lifting plate 303. The servo motor 304 is vertically mounted on the lifting plate 303, and its output shaft is connected to the suction box 306 via a flange. Multiple suction pipes 309 are connected to the upper side of the suction box 306. The dual-axis cylinder 302 drives the lifting plate 303, the suction box 306, and the adsorbed workpiece to rise and fall as a whole. After the workpiece is assembled, it can move upward, allowing the automotive energy-absorbing box 40 to be freed from the constraints of the adsorption box 111 and the positioning pin 205. The servo motor 304 can drive the suction box 306 and the adsorbed workpiece to rotate as a whole, completing the welding operation of the circumferential weld of the workpiece without manual flipping, greatly improving the convenience of welding operation and production efficiency.

[0038] Furthermore, photoelectric switches 311 are mounted on the left and right sides of the suction box 306 via sensor bracket 310, respectively; and photoelectric switch 313 is mounted on the lower side of the suction box 306 via sensor bracket 312. Photoelectric switch 311 is used to detect the adsorption position of the semi-shell, and photoelectric switch 313 is used to detect the adsorption position of the assembly plate. Together, they constitute a workpiece in-situ detection unit, which can prevent welding from starting when the workpiece is not properly clamped or adsorption fails, thus improving the safety of the device operation and the welding qualification rate.

[0039] The working principle of an automotive parts welding device is as follows: 1. Pre-positioning of loading: Place half-shell 1 401 and half-shell 2 402 horizontally in the positioning slots 111a of the left and right adsorption boxes 111 respectively. After turning on the vacuum, the half-shells are initially adsorbed and fixed through the adsorption holes 111b. Set the assembly plate 403 on the positioning pins 205 of the lifting frame 204 to complete the horizontal pre-positioning.

[0040] 2. Maintain the pre-downward movement of the mechanism: The piston rod of the dual-axis cylinder 302 extends downward, driving the lifting plate 303 and the suction box 306 down to the preset position between the two adsorption boxes 111, preparing for subsequent adsorption and fixation.

[0041] 3. Half-shell flipping adjustment: Start the hydraulic cylinder 201, its piston rod extends upward to drive the lifting bar 202 to rise; when it extends to the first half, the compression spring 203 remains at its original length, and the lifting bar 202 pushes the two sliding frames 208 on both sides to move towards each other along the linear guide rail 206 through the hinge bar 213; the rack 210 on the sliding frame 208 meshes with the gear 211 at the end of the rotating shaft 108 to drive the rotating shaft 108 and the rotating plate 110 to flip inward, thereby causing the two adsorption boxes 111 on both sides to flip from the horizontal state to the vertical state simultaneously, completing the attitude adjustment of the half-shell.

[0042] 4. Synchronous assembly: The piston rod of hydraulic cylinder 201 continues to extend into the second half of the stroke. At this time, the half-shell has been flipped to a vertical position, and gear 211 and rack 210 no longer rotate relative to each other. Lifting bar 202 continues to rise and compresses compression spring 203. Lifting frame 204 and positioning pin 205 maintain a constant height. Hinge bar 213 continues to push the sliding frames 208 on both sides to move towards each other. Through rotating shaft 108, sliding plate 107 is driven to slide inward along linear guide rail 105, so that the two vertical half-shells move closer to each other and align. At the same time, lifting frame 204 drives assembly plate 403 to synchronously dock to the bottom of the two half-shells, completing the overall assembly of energy absorption box 40.

[0043] 5. Adsorption and Lower Reset: After splicing, the suction box 306 is connected to a vacuum, and the inner walls of the two halves of the shell 401 and 402 are adsorbed and fixed by the vacuum suction cups 307 on the left and right sides, and the assembly plate 403 is adsorbed and fixed by the vacuum suction cup 308 at the bottom, so as to achieve overall fixation of all workpieces; then the piston rod of the hydraulic cylinder 201 retracts, and the positioning mechanism 10 and the splicing mechanism 20 are reset synchronously, releasing the lower constraint on the workpiece and leaving space for welding operation.

[0044] 6. Rotary welding and unloading: Start the servo motor 304 to drive the suction box 306 and the energy-absorbing box 40 fixed by adsorption to rotate the workpiece as a whole, and continuously complete the welding of the circumferential weld in conjunction with the external welding equipment; after the welding is completed, the servo motor 304 stops, the dual-axis cylinder 302 drives the workpiece to move upward and reset, and the finished product can be removed after the vacuum system is depressurized. All mechanisms are reset and ready for the next round of operation.

[0045] Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not exhaustive. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. A welding device for automotive parts, characterized in that, include: The positioning mechanism (10) includes a pair of adsorption boxes (111), which are used to horizontally support and adsorb the first half shell (401) and the second half shell (402) of the car energy absorption box (40). The splicing mechanism (20) is located below the pair of adsorption boxes (111) and includes a hydraulic cylinder (201) and multiple positioning pins (205). The positioning pins (205) are used to horizontally position the assembly plate (403) of the car energy absorption box (40). The hydraulic cylinder (201) drives the first half-shell (401) and the second half-shell (402) to move closer to each other and align and splice through a gear transmission mechanism and a planar linkage mechanism connected in sequence, and at the same time drives the assembly plate (403) to be synchronously docked to the bottom of the first half-shell (401) and the second half-shell (402). The retaining mechanism (30) is located above the pair of adsorption boxes (111) and includes an air suction box (306). Vacuum suction cups 1 (307) are provided on the left and right sides of the air suction box (306) respectively, and vacuum suction cup 2 (308) is provided at the bottom. The vacuum suction cups 1 (307) on both sides are used to adsorb and fix half shell 1 (401) and half shell 2 (402) to the corresponding side of the air suction box (306) respectively, and the vacuum suction cup 2 (308) is used to adsorb and fix the assembly plate (403) to the lower side of the air suction box (306).

2. The automotive parts welding device according to claim 1, characterized in that, The positioning mechanism (10) further includes a support plate (101), on which multiple support feet (102) are evenly installed on the lower side, and support bars (103) are vertically fixed on the left and right sides. A C-shaped support frame (104) is connected to the upper part of the support bars (103). Linear guide rails (105) are horizontally installed on the front and rear sides of the support frame (104). A slider (106) is slidably fitted on the linear guide rails (105), and a sliding plate (107) is connected to the slider (106). A rotating shaft (108) is rotatably connected between the plates (107), and a rotating plate (110) is fixedly connected to the rotating shaft (108). The adsorption box (111) is horizontally installed on the upper side of the rotating plate (110). The upper surface of the adsorption box (111) is provided with a positioning groove (111a) that is adapted to the outer surface of the first half shell (401) or the second half shell (402). Multiple adsorption holes (111b) are evenly distributed at the bottom of the positioning groove (111a). Multiple suction pipes (112) are connected to the side of the adsorption box (111).

3. The automotive parts welding device according to claim 2, characterized in that, A tension spring (109) is connected between the rotating shaft (108) and the support frame (104).

4. The automotive parts welding device according to claim 2, characterized in that, The hydraulic cylinder (201) is vertically installed on the upper side of the support plate (101), and its piston rod is connected upward to the lifting bar (202); the upper part of the lifting bar (202) is coaxially connected to an X-shaped lifting frame (204) through a compression spring (203), and multiple positioning pins (205) are vertically connected to the middle of the lifting frame (204); linear guide rails (206) are horizontally installed on the left and right sides of the lifting frame (204), and sliders (207) are slidably fitted on the linear guide rails (206), and sliders (208) are connected to the sliders (207).

5. The automotive parts welding apparatus according to claim 4, characterized in that, A sliding bar (209) is vertically connected to the upper side of the sliding frame (208), and a rack (210) is vertically connected to the sliding bar (209); a gear (211) is installed at the end of the rotating shaft (108), and the gear (211) meshes with the rack (210) on the corresponding side.

6. The automotive parts welding apparatus according to claim 4, characterized in that, The lower side of the sliding frame (208) is vertically connected to a second sliding bar (212), and the second sliding bar (212) is hinged to the lifting bar (202) via a hinge bar (213).

7. The automotive parts welding device according to claim 4, characterized in that, The lifting frame (204) is vertically connected to the front and rear sides by guide posts (214), and the guide posts (214) slide with the lifting bar (202) through guide sleeves (215).

8. The automotive parts welding device according to claim 2, characterized in that, The holding mechanism (30) also includes a dual-axis cylinder (302) and a servo motor (304); the dual-axis cylinder (302) is vertically installed between two support bars (103) on the left and right sides via a fixing plate (301), and its piston rod is connected downward to a lifting plate (303); the servo motor (304) is vertically installed on the lifting plate (303), and its output shaft is connected to the air intake box (306) via a flange; the upper side of the air intake box (306) is connected to multiple air intake pipes (309).

9. The automotive parts welding apparatus according to claim 8, characterized in that, Photoelectric switch 1 (311) is installed on the left and right sides of the air intake box (306) via sensor bracket 1 (310); photoelectric switch 2 (313) is installed on the lower side of the air intake box (306) via sensor bracket 2 (312).

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