An aerogel punch cutting device

Abstract

The utility model relates to an aerogel hot pressing cutting device, including base, cutting table, cutting mechanism, positioning mechanism, support frame, feeding mechanism and conveying mechanism, the cutting table is installed on the base, is provided with cutting mechanism above the cutting table, is installed with positioning mechanism on the cutting table, cutting mechanism is installed on the support frame, is installed with feeding mechanism on the support frame, the support frame is installed on the base, and the front end of base is provided with conveying mechanism, the utility model discloses through the sliding table cylinder one promotes L shape connecting plate one removal, and the horizontal positioning plate also removes along with, and the horizontal positioning plate promotes aerogel board removal, and the horizontal alignment of aerogel board is carried out, and the sliding table cylinder two promotes longitudinal positioning plate removal, and the longitudinal positioning plate promotes aerogel board removal, and the longitudinal alignment of aerogel board is carried out, to be able to carry out the positioning of aerogel board to horizontal and longitudinal, make aerogel board positioning convenient and accurate, improve the cutting accuracy of aerogel board.

Description

Technical Field

[0001] This utility model relates to the field of aerogel processing technology, specifically to an aerogel stamping and cutting device. Background Technology

[0002] Aerogel possesses numerous advantages, including low density, small pore size, low thermal insulation coefficient, and low sound propagation speed, making it an ideal thermal insulation material. However, the production of aerogel sheets or boards requires cutting. Existing cutting devices lack a positioning structure for the aerogel sheets, causing them to sway left and right under the force of the cutting blade during the cutting process, resulting in misalignment and insufficient cutting accuracy. Therefore, it is necessary to design an aerogel stamping and cutting device. Utility Model Content

[0003] The purpose of this invention is to provide an aerogel stamping and cutting device to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an aerogel stamping and cutting device, comprising a base, a cutting table, a cutting mechanism, a positioning mechanism, a support frame, a feeding mechanism, and a conveying mechanism. The cutting table is mounted on the base, the cutting mechanism is arranged above the cutting table, the positioning mechanism is mounted on the cutting table, the cutting mechanism is mounted on the support frame, the feeding mechanism is mounted on the support frame, the support frame is mounted on the base, and the conveying mechanism is arranged at the front end of the base.

[0005] Preferably, the cutting mechanism includes a pressure plate and a stamping plate. A hollow groove is provided in the middle of the pressure plate. An extension plate is installed at one end of the pressure plate. Guide rods are installed at the four corners of the pressure plate. A stop block is installed at one end of the guide rod. A sliding sleeve is fitted on the guide rod. The sliding sleeve is installed on the base plate. The base plate is installed on the cutting table. Two cutting blades are installed on the top of the cutting table.

[0006] Preferably, the cutting tool includes a cutting blade and a cutting blade base. The cutting blade is a square shell shape, with the top of the cutting blade being the cutting edge and the bottom of the cutting blade mounted on the cutting blade base. The cutting blade base has four stepped holes, and a limit rod is inserted into each stepped hole. The top of the limit rod is connected to a lifting plate, and a stop block is installed at the bottom of the limit rod. A spring is fitted on the limit rod, with one end of the spring connected to the cutting blade base and the other end of the spring connected to the lifting plate.

[0007] Preferably, a second spring is sleeved on the guide rod, and the second spring is located between the pressure plate and the bottom plate. There are two pressure plates, which are arranged side by side below the stamping plate. The stamping plate is connected to the piston rod of the hydraulic cylinder. The hydraulic cylinder is mounted on the support frame. Four guide sleeves are installed on the support frame. Each guide sleeve is fitted with a guide rod. The bottom end of the guide rod is mounted on the stamping plate, and the top end of the guide rod is provided with a limit block.

[0008] Preferably, there are two positioning mechanisms. The positioning mechanism includes a transverse positioning plate, a transverse baffle, a longitudinal positioning plate, and a longitudinal baffle. The transverse positioning plate is located on one side of the pressure plate and is connected to one end of an L-shaped connecting plate. The other end of the L-shaped connecting plate is mounted on the slide of a slide cylinder. The slide cylinder is mounted on a cylinder mounting plate and is mounted on the bottom of the pressure plate. The transverse baffle is mounted on the other side of the pressure plate.

[0009] Preferably, the longitudinal positioning plate is located at one end of the pressure plate, the longitudinal positioning plate is connected to one end of the L-shaped connecting plate two, the other end of the L-shaped connecting plate two is installed on the slide of the slide cylinder two, the slide cylinder two is installed on the extension plate, the L-shaped connecting plate two is provided with a clearance hole to avoid the extension plate, and the longitudinal baffle is installed at the other end of the pressure plate.

[0010] Preferably, the feeding mechanism includes a vacuum suction cup and a linear module for driving the vacuum suction cup to move. The linear module is mounted on a support frame via a linear module mounting plate. A vertical plate is mounted on the slide of the linear module, and a slide cylinder three is mounted on the vertical plate. A vacuum suction cup mounting plate is mounted on the slide of the slide cylinder three, and two sets of vacuum suction cup assemblies are mounted on the vacuum suction cup mounting plate. Each vacuum suction cup assembly consists of four sets of vacuum suction cups arranged in a rectangular array. The multiple vacuum suction cups are connected to a vacuum pump via air pipes.

[0011] Preferably, the conveying mechanism includes a conveyor belt and a motor for driving the conveyor belt to move. There are two conveyor belts, each of which is wound around a driving pulley and a driven pulley. The two driving pulleys are mounted on a driving shaft, which is connected to the output end of the motor. The motor is mounted on a frame, and the driving shaft is rotatably mounted on one end of the frame. A driven shaft is rotatably mounted on the other end of the frame, and two driven pulleys are installed at intervals on the driven shaft. Multiple material separating components are evenly distributed on the surface of the conveyor belt.

[0012] Preferably, the material separating assembly includes two partitions, forming a receiving space for placing the aerogel board between the two partitions. A tray is installed on the frame, and baffles are provided on both sides of the tray. A hollow groove is provided at one end of the tray, and a blocking component is provided below the hollow groove.

[0013] Preferably, the blocking assembly includes a blocking plate, which is connected to the piston rod of the slide cylinder four. The slide cylinder four is mounted on a support plate, which is mounted on a frame. Two spaced-apart sensor brackets are mounted on the support plate, and each sensor bracket is equipped with a photoelectric sensor.

[0014] Compared with the prior art, the technical solution provided by this utility model has at least the following technical effects or advantages: This invention utilizes a sliding cylinder to move an L-shaped connecting plate, which in turn moves a transverse positioning plate, aligning the aerogel board laterally. A second sliding cylinder moves a longitudinal positioning plate, which in turn moves the aerogel board longitudinally, aligning it longitudinally. This allows for convenient and precise positioning of the aerogel board, improving cutting accuracy. Furthermore, a hydraulic cylinder moves a stamping plate downwards, which in turn moves a pressure plate downwards. The transverse positioning plate, transverse baffle, longitudinal positioning plate, longitudinal baffle, and the aerogel board all move downwards, causing the aerogel board to be pressed downwards. A cutting blade then cuts the aerogel board. During this process, springs one and two are compressed, and the cut aerogel board is placed on a lifting plate inside the cutting blade. The hydraulic cylinder moves the stamping plate upwards to reset it, and spring one moves the lifting plate, which then pushes the aerogel board out, facilitating removal and preventing the aerogel board from getting stuck inside the cutting blade. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the cutting mechanism in this utility model; Figure 3 This is a perspective view of the positioning mechanism in this utility model; Figure 4 This is an exploded view of the cutting tool in this utility model; Figure 5 This is a schematic diagram of the conveying mechanism in this utility model.

[0016] In the attached image: 1. Base; 2. Cutting table; 3. Cutting mechanism; 301. Pressure plate; 302. Hollowed-out groove one; 303. Extension plate; 304. Guide rod; 305. Stop block one; 306. Sliding sleeve; 307. Base plate; 308. Cutting blade; 3081. Cutting blade; 3082. Cutting blade base; 3083. Step hole; 3084. Limiting rod; 3085. Lifting plate; 3086. Stop block two; 3087. Spring one; 309. Spring two; 310. Stamping plate; 311. Hydraulic cylinder; 312. Guide sleeve; 313. Guide rod; 314. Limiting block; 4. Positioning mechanism; 401. Transverse positioning plate; 402. L-shaped connecting plate one; 403. Slide table cylinder one; 404. Cylinder mounting plate; 405. Transverse baffle; 406. 407. Longitudinal positioning plate; 408. L-shaped connecting plate II; 409. Slide cylinder II; 410. Clearance hole; 5. Longitudinal baffle; 6. Support frame; 701. Feeding mechanism; 602. Vacuum suction cup; 603. Linear module; 604. Linear module mounting plate; 605. Vertical plate; 606. Slide cylinder III; 607. Vacuum suction cup mounting plate; 708. Conveying mechanism; 701. Conveyor belt; 702. Motor; 703. Drive pulley; 704. Driven pulley; 705. Drive shaft; 706. Frame; 707. Driven shaft; 708. Partition plate; 709. Support plate; 710. Baffle; 711. Hollowed-out groove II; 712. Blocking plate; 713. Slide cylinder IV; 714. Support plate; 715. Sensor bracket; 716. Photoelectric sensor. Detailed Implementation

[0017] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0018] Please see Figure 1-5 As shown, this utility model provides a technical solution: an aerogel stamping and cutting device, including a base 1, a cutting table 2, a cutting mechanism 3, a positioning mechanism 4, a support frame 5, a feeding mechanism 6, and a conveying mechanism 7. The cutting table 2 is installed on the base 1, the cutting mechanism 3 is arranged above the cutting table 2, the positioning mechanism 4 is installed on the cutting table 2, the cutting mechanism 3 is installed on the support frame 5, the feeding mechanism 6 is installed on the support frame 5, the support frame 5 is installed on the base 1, the conveying mechanism 7 is arranged at the front end of the base 1, and the feeding mechanism 6 is located between the cutting table 2 and the conveying mechanism 7.

[0019] The cutting mechanism 3 in this embodiment includes a pressure plate 301 and a stamping plate 310. Two pressure plates 301 are provided. A slot 302 is formed in the middle of each pressure plate 301. An extension plate 303 is installed at one end of each pressure plate 301. Guide rods 304 are installed at the four corners of each pressure plate 301. A stop block 305 is installed at one end of each guide rod 304. A sliding sleeve 306 is fitted onto each guide rod 304 and is mounted on a base plate 307. The base plate 307 is mounted on a cutting table 2. Two cutting blades 308 are installed on the top of the cutting table 2. The cutting blades 308 are located within the slot 302 of the pressure plate 301. Each cutting blade 308 includes a cutting blade 3081 and a cutting cutter. The base 3082 and the cutting blade 3081 are square shells. The top of the cutting blade 3081 is the blade part, and the bottom of the cutting blade 3081 is installed on the cutting blade base 3082. The cutting blade base 3082 has four stepped holes 3083. Limiting rods 3084 are inserted into the stepped holes 3083. The top of the limiting rods 3084 is connected to the lifting plate 3085. The bottom of the limiting rods 3084 is equipped with a second stop block 3086. A first spring 3087 is fitted on the limiting rods 3084. One end of the first spring 3087 is connected to the cutting blade base 3082, and the other end of the first spring 3087 is connected to the lifting plate 3085. The lifting plate 3085 is located inside the cutting blade 3081.

[0020] In this embodiment, a second spring 309 is sleeved on the guide rod 304. The second spring 309 is located between the pressure plate 301 and the bottom plate 307. There are two pressure plates 301, which are arranged side by side below the stamping plate 310. The stamping plate 310 is connected to the piston rod of the hydraulic cylinder 311. The hydraulic cylinder 311 is mounted on the support frame 5. Four guide sleeves 312 are installed on the support frame 5. Each guide sleeve 312 is sleeved with a guide rod 313. The bottom end of the guide rod 313 is mounted on the stamping plate 311, and the top end of the guide rod 313 is provided with a limit block 314.

[0021] In this embodiment, two positioning mechanisms 4 are provided. Each positioning mechanism 4 includes a transverse positioning plate 401, a transverse baffle 405, a longitudinal positioning plate 406, and a longitudinal baffle 410. The transverse positioning plate 401 is located on one side of the pressure plate 301 and is connected to one end of an L-shaped connecting plate 402. The other end of the L-shaped connecting plate 402 is mounted on the slide of a slide cylinder 403. The slide cylinder 403 is mounted on a cylinder mounting plate 404, which has an L-shaped structure. A transverse baffle 405 is installed on the other side of the pressure plate 301, and a longitudinal positioning plate 406 is located at one end of the pressure plate 301. The longitudinal positioning plate 406 is connected to one end of the L-shaped connecting plate 407. The other end of the L-shaped connecting plate 407 is installed on the slide of the slide cylinder 408. The slide cylinder 408 is installed on the extension plate 303. The L-shaped connecting plate 407 has a clearance hole 409 to avoid the extension plate 303. A longitudinal baffle 410 is installed at the other end of the pressure plate 301.

[0022] The feeding mechanism 6 in this embodiment includes a vacuum suction cup 601 and a linear module 602 that drives the vacuum suction cup 601 to move. The linear module 602 is mounted on the support frame 5 via a linear module mounting plate 603. A vertical plate 604 is mounted on the slide of the linear module 602. A slide cylinder 605 is mounted on the vertical plate 604. A vacuum suction cup mounting plate 606 is mounted on the slide of the slide cylinder 605. Two sets of vacuum suction cup assemblies are mounted on the vacuum suction cup mounting plate 606. The vacuum suction cup assembly consists of four sets of vacuum suction cups 601 arranged in a rectangular array. The multiple vacuum suction cups 601 are connected to a vacuum pump through air pipes.

[0023] The conveying mechanism 7 in this embodiment includes a conveyor belt 701 and a motor 702 for driving the conveyor belt 701. Two conveyor belts 701 are provided, each wound around a driving pulley 703 and a driven pulley 704. The two driving pulleys 703 are mounted on a driving shaft 705, which is connected to the output end of the motor 702. The motor 702 is mounted on a frame 706. The driving shaft 705 is rotatably mounted on one end of the frame 706, and a driven shaft 707 is rotatably mounted on the other end of the frame 706. Two driven pulleys 704 are spaced apart on the driven shaft 707. Multiple material separating components are evenly distributed on the surface of the conveyor belt 701. Each material separating component includes two partitions 708, forming a receiving space for placing aerogel sheets between the two partitions 708. A support plate 709 is mounted on the frame 706, located below the conveyor belt 701. 709 supports the aerogel on the conveyor belt 701. Baffles 710 are provided on both sides of the support plate 709. A hollow groove 711 is opened at one end of the support plate 709. A blocking assembly is provided below the hollow groove 711. The blocking assembly includes a blocking plate 712. The blocking plate 712 has an L-shaped structure and is connected to the piston rod of the slide cylinder 713. The slide cylinder 713 is mounted on a support plate 714. The support plate 714 is mounted on a frame 706. Two spaced sensor brackets 715 are mounted on the support plate 714. Each sensor bracket 715 is equipped with a photoelectric sensor 716. The two photoelectric sensors 716 are electrically connected to the PLC controller. The PLC controller is electrically connected to the hydraulic cylinder 311, the slide cylinder 403, the slide cylinder 408, the vacuum pump, the linear module 602, the slide cylinder 605, and the motor 702.

[0024] The working principle of this invention is as follows: The two ends of the aerogel plate are placed sequentially between the two partitions 708 of the two conveyor belts 701. The motor 702 drives the drive shaft 705 to rotate, which in turn drives the two drive pulleys 703 to rotate. The two drive pulleys 703 then move the two conveyor belts 701, thereby moving the aerogel plate. When both photoelectric sensors 716 detect the aerogel plate, they send the detected signals to the PLC controller. The PLC controller then controls the slide cylinder 713 to push the blocking plate 712 upwards, preventing the aerogel plate from moving. The PLC controller then stops the motor 702, and the slide cylinder 605 pushes the vacuum suction cup mounting plate 606 downwards. The two sets of vacuum suction cup assemblies also move downwards, bringing the vacuum suction cups 601 of the two sets of vacuum suction cup assemblies into contact with the aerogel plate. The vacuum pump is then activated, and the vacuum suction cups 601 create a vacuum under the action of the vacuum pump. The environment allows for the adsorption of aerogel sheets. After adsorption, the slide cylinder 3 (605) moves the vacuum suction cup mounting plate 606 upward to reset it. The linear module 602 moves the vertical plate 604, and the slide cylinder 3 (605), vacuum suction cup mounting plate 606, and vacuum suction cup 601 also move accordingly, thereby moving the two aerogel sheets above the two pressure plates 301. The vacuum pump is turned off, and the aerogel sheets on the vacuum suction cup 601 fall onto the pressure plate 301. The slide cylinder 1 (403) pushes the L-shaped connecting plate 1 (402) to move, and the transverse positioning plate 401 also moves accordingly. The transverse positioning plate 401 pushes the aerogel sheets to move, aligning them laterally. The slide cylinder 2 (408) pushes the longitudinal positioning plate 406 to move, aligning the aerogel sheets longitudinally. This allows for both transverse and longitudinal positioning of the aerogel sheets, making the positioning convenient and accurate, and improving the cutting precision of the aerogel sheets.

[0025] Hydraulic cylinder 311 drives stamping plate 310 to move downward, stamping plate 310 drives bearing plate 301 to move downward, transverse positioning plate 401, transverse baffle 405, longitudinal positioning plate 406, longitudinal baffle 410 and aerogel plate also move downward, causing aerogel plate to be stamped downward, and cut by cutting blade 3081. At this time, spring 1 3087 and spring 2 309 are compressed. The cut aerogel plate is placed on lifting plate 3085 inside cutting blade 3081. Hydraulic cylinder 311 drives stamping plate 310 to move upward to reset, and spring 1 3087 drives lifting plate 3085, lifting plate 3085 pushes out aerogel plate to facilitate material removal and prevent aerogel plate from getting stuck inside cutting blade 3081.

[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. An aerogel stamping and cutting device, characterized in that: The system includes a base (1), a cutting table (2), a cutting mechanism (3), a positioning mechanism (4), a support frame (5), a feeding mechanism (6), and a conveying mechanism (7). The cutting table (2) is mounted on the base (1), the cutting mechanism (3) is located above the cutting table (2), the positioning mechanism (4) is mounted on the cutting table (2), the cutting mechanism (3) is mounted on the support frame (5), the feeding mechanism (6) is mounted on the support frame (5), the support frame (5) is mounted on the base (1), and the conveying mechanism (7) is located at the front end of the base (1). There are two positioning mechanisms (4). It includes a transverse positioning plate (401), a transverse baffle (405), a longitudinal positioning plate (406), and a longitudinal baffle (410). The transverse positioning plate (401) is located on one side of the pressure plate (301). The transverse positioning plate (401) is connected to one end of an L-shaped connecting plate (402). The other end of the L-shaped connecting plate (402) is installed on the slide of a slide cylinder (403). The slide cylinder (403) is installed on a cylinder mounting plate (404). The cylinder mounting plate (404) is installed at the bottom of the pressure plate (301). The transverse baffle (405) is installed on the other side of the pressure plate (301).

2. The aerogel stamping and cutting device according to claim 1, characterized in that: The cutting mechanism (3) includes a pressure plate (301) and a stamping plate (310). A hollow groove (302) is provided in the middle of the pressure plate (301). An extension plate (303) is installed at one end of the pressure plate (301). Guide rods (304) are installed at the four corners of the pressure plate (301). A stop block (305) is installed at one end of the guide rod (304). A sliding sleeve (306) is fitted on the guide rod (304). The sliding sleeve (306) is installed on the base plate (307). The base plate (307) is installed on the cutting table (2). Two cutting tools (308) are installed on the top of the cutting table (2).

3. The aerogel stamping and cutting device according to claim 2, characterized in that: The cutting tool (308) includes a cutting blade (3081) and a cutting blade base (3082). The cutting blade (3081) is a square shell shape. The top of the cutting blade (3081) is the cutting edge. The bottom of the cutting blade (3081) is mounted on the cutting blade base (3082). The cutting blade base (3082) has four stepped holes (3083). Limiting rods (3084) are inserted into the stepped holes (3083). The top of the limiting rods (3084) is connected to the lifting plate (3085). The bottom of the limiting rods (3084) is equipped with a stop block (3086). A spring (3087) is fitted on the limiting rods (3084). One end of the spring (3087) is connected to the cutting blade base (3082), and the other end of the spring (3087) is connected to the lifting plate (3085).

4. The aerogel stamping and cutting device according to claim 3, characterized in that: Spring 2 (309) is sleeved on the guide rod (304). Spring 2 (309) is located between the pressure plate (301) and the bottom plate (307). There are two pressure plates (301). The two pressure plates (301) are arranged side by side below the stamping plate (310). The stamping plate (310) is connected to the piston rod of the hydraulic cylinder (311). The hydraulic cylinder (311) is installed on the support frame (5). Four guide sleeves (312) are installed on the support frame (5). Each guide sleeve (312) is sleeved with a guide rod (313). The bottom end of the guide rod (313) is installed on the stamping plate (310). The top end of the guide rod (313) is provided with a limit block (314).

5. The aerogel stamping and cutting device according to claim 1, characterized in that: The longitudinal positioning plate (406) is located at one end of the pressure plate (301). The longitudinal positioning plate (406) is connected to one end of the L-shaped connecting plate (407). The other end of the L-shaped connecting plate (407) is installed on the slide of the slide cylinder (408). The slide cylinder (408) is installed on the extension plate (303). The L-shaped connecting plate (407) has a clearance hole (409) to avoid the extension plate (303). The longitudinal baffle (410) is installed at the other end of the pressure plate (301).

6. The aerogel stamping and cutting device according to claim 1, characterized in that: The feeding mechanism (6) includes a vacuum suction cup (601) and a linear module (602) for driving the vacuum suction cup (601) to move. The linear module (602) is mounted on the support frame (5) via a linear module mounting plate (603). A vertical plate (604) is mounted on the slide of the linear module (602). A slide cylinder three (605) is mounted on the vertical plate (604). A vacuum suction cup mounting plate (606) is mounted on the slide of the slide cylinder three (605). Two sets of vacuum suction cup assemblies are mounted on the vacuum suction cup mounting plate (606). The vacuum suction cup assembly consists of four sets of vacuum suction cups (601). The four vacuum suction cups (601) are arranged in a rectangular array. The multiple vacuum suction cups (601) are connected to the vacuum pump through air pipes.

7. The aerogel stamping and cutting device according to claim 1, characterized in that: The conveying mechanism (7) includes a conveyor belt (701) and a motor (702) for driving the conveyor belt (701) to move. There are two conveyor belts (701), each of which is wound around a drive pulley (703) and a driven pulley (704). The two drive pulleys (703) are mounted on a drive shaft (705), which is connected to the output end of the motor (702). The motor (702) is mounted on a frame (706). The drive shaft (705) is rotatably mounted on one end of the frame (706), and a driven shaft (707) is rotatably mounted on the other end of the frame (706). Two driven pulleys (704) are spaced apart on the driven shaft (707). Multiple material separation components are evenly distributed on the surface of the conveyor belt (701).

8. The aerogel stamping and cutting device according to claim 7, characterized in that: The material separation assembly includes two partitions (708), forming a receiving space for placing the aerogel board between the two partitions (708). A tray (709) is installed on the frame (706), and baffles (710) are provided on both sides of the tray (709). A hollow groove (711) is opened at one end of the tray (709), and a blocking component is provided below the hollow groove (711).

9. The aerogel stamping and cutting device according to claim 8, characterized in that: The blocking assembly includes a blocking plate (712), which is connected to the piston rod of the slide cylinder four (713). The slide cylinder four (713) is mounted on a support plate (714), which is mounted on a frame (706). Two spaced sensor brackets (715) are mounted on the support plate (714), and each sensor bracket (715) is equipped with a photoelectric sensor (716).

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