Roller conveying and oiling device

Abstract

The invention relates to the technical field of metal stamping auxiliary equipment, in particular to a roller conveying and oiling device which comprises a rack, an oil spraying unit is connected to the rack, and an oil spraying area is formed at the oil spraying unit; the conveying unit is connected with the rack and forms a feeding plane, a material placing area and a material taking area are formed at the two ends of the feeding plane formed by the conveying unit respectively, and the oil spraying area formed by the oil spraying unit is located between the material placing area and the material taking area; the stopping plate is connected with the rack and is arranged perpendicular to the conveying direction, and the stopping plate is located in the material taking area; the connecting line of the two sets of centering rods is perpendicular to the conveying direction, and the centering rods are located between the oil injection unit and the stop plate; the driving unit is used for changing the distance between the two groups of centering rods, and the driving unit is connected with the rack and the centering rods; the drawing oil spraying device has the effect that the position of the to-be-drawn material is adjusted after the drawing oil is sprayed.

Description

Technical Field

[0001] This application relates to the field of metal stamping auxiliary equipment technology, and in particular to a roller conveyor oiling device. Background Technology

[0002] Stamping is a production technology that uses the power of conventional or special stamping equipment to directly deform sheet metal in a mold to obtain product parts with certain shapes, sizes and properties. It is the most commonly used forming method in home appliance production. It mainly includes forming, blanking, bending, shearing, stretching, bulging, spinning and straightening processes. Among them, stretching is a more critical link in stamping production.

[0003] To reduce material scrap rate, drawing oil is usually sprayed before the stretching process. Existing technology discloses an oiling device for stamping dies, which includes a frame, an inlet mechanism, a first oil spraying device, a first oil spreading roller mechanism, a first oil scraping mechanism, a second oil spraying device, a second oil spreading roller mechanism, a second oil scraping mechanism, and an outlet mechanism arranged sequentially along the material conveying direction on the frame. The first oil spraying device has an upper oil spraying mechanism for spraying the upper surface of the material strip, and the second oil spraying device has a lower oil spraying device for spraying the lower surface of the material strip. A first oil scraping mechanism is provided on one side of the output end of the first oil spreading roller mechanism, scraping material from the upper oil spreading roller of the first oil spreading roller mechanism. An auxiliary oil collection hopper is provided below the first oil scraping mechanism. A second oil scraping mechanism is provided on one side of the input end of the second oil spreading roller mechanism, scraping material from the lower oil spreading roller of the second oil spreading roller mechanism. A recovery oil tank is provided above the frame.

[0004] Regarding the aforementioned technologies, after the staff places the material to be stretched onto the conveyor belt, the material to be stretched passes through the first and second oil spraying devices in sequence under the transport of the inlet mechanism, and then moves to the outlet mechanism. However, since the external force applied to the material to be stretched during the oil scraping process will cause the position of the material to be stretched to change, the position of the material to be stretched needs to be manually adjusted. Summary of the Invention

[0005] In order to adjust the position of the material to be stretched after the coating of drawing oil is completed, this application provides a roller conveyor oiling device.

[0006] The technical solution of the roller conveyor oiling device provided in this application is as follows: A roller conveyor oiling device, comprising: A frame on which an oil injection unit is connected, and an oil injection zone is formed at the oil injection unit; The conveying unit is connected to the frame and forms a feeding plane. The two ends of the feeding plane formed by the conveying unit respectively form a feeding area and a picking area. The oil spraying unit forms an oil spraying area between the feeding area and the picking area. A set of stop plates, the stop plates being able to pass through the feeding plane from bottom to top, and the stop plates being located in the material taking area; Two sets of centering rods are provided, with the line connecting the two sets of centering rods perpendicular to the conveying direction, and the centering rods are located between the oil injection unit and the stop plate. A drive unit for changing the spacing between two sets of centering rods, the drive unit being connected to the frame and the centering rod.

[0007] By adopting the above technical solution, the worker places the material in the feeding area on the feeding plane, and then the conveying unit transports the material from the feeding area to the picking area. During the conveying process, the material passes through the oil spraying area, where the oil spraying unit sprays drawing oil onto the surface of the material. After the drawing oil is sprayed, the material continues to move under the action of the conveying unit until it reaches the picking area and contacts the stop plate. Then, the two sets of centering rods move closer or further apart under the drive of the drive unit, thereby achieving the attitude control of the material. The robot arm can easily pick up the material sprayed with drawing oil and transfer it to the next process without manual attitude adjustment. The designed roller conveyor oiling device facilitates the installation of the oil spraying unit, conveying unit, and drive unit through the frame. The oil spraying unit facilitates the spraying of drawing oil onto the material. The conveying unit allows the material to move from the feeding area to the picking area and pass through the oil spraying area. The stop plate, centering rods, and drive unit work together to achieve the attitude adjustment of the material, thus facilitating the robot arm to pick up the material sprayed with drawing oil and transfer it to the next process without manual attitude adjustment.

[0008] In one specific implementation, the conveying unit includes: Multiple conveyor rollers are arranged parallel to each other and form a feeding plane, and the conveyor rollers are rotatably connected to the frame. A conveying mechanism for driving the conveying roller to rotate, the conveying mechanism being connected to the frame and the conveying roller being connected to the conveying mechanism.

[0009] By adopting the above technical solution, the designed conveying unit can form a feeding plane through the conveying rollers, and the conveying mechanism can drive the conveying rollers to rotate, thereby moving the material from the feeding area to the picking area.

[0010] In one specific implementation, the surface of the conveyor roller is covered with a soft, scratch-resistant film.

[0011] By adopting the above technical solution, the designed conveyor roller with a surface covered with a soft anti-scratch film can reduce the possibility of scratching the material surface when conveying materials.

[0012] In one specific implementation, the drive unit includes: A guide bar, which is connected to the frame and is located below the feeding plane; Two sliding blocks are slidably connected to the guide bar, and the centering rod is installed on the sliding blocks. The sliding direction of the sliding rod is perpendicular to the conveying direction. A drive mechanism is connected to the guide bar and the sliding block.

[0013] By adopting the above technical solution, the designed drive unit can use the guide bar as the sliding base of the sliding block and as the installation base of the drive mechanism. The sliding block can be used as the installation base of the centering rod. The drive mechanism can realize the position movement of the sliding block, thereby realizing the position movement of the centering rod.

[0014] In one specific implementation, a tapping cylinder is mounted on the sliding block, and the piston rod of the tapping cylinder is connected to the centering rod via a connecting rod, so that the centering rod can slide relative to the sliding block along the sliding direction of the sliding block.

[0015] By adopting the above technical solution, the designed tapping cylinder can achieve a small range of movement of the centering rod position, thereby improving the efficiency of material posture adjustment.

[0016] In one specific implementation, two outer limiting plates are installed on the guide strip, and the sliding block slides in the sliding area between the two outer limiting plates.

[0017] By adopting the above technical solution, the designed outer limiting plate can limit the displacement stroke of the sliding block.

[0018] In one specific implementation, the drive mechanism includes: A drive motor is connected to the guide bar, and the axial direction of the output shaft of the drive motor is parallel to the sliding direction of the sliding block; A drive rod is coaxially connected to the output shaft of the drive motor, and the drive rod is connected to the sliding block via a linear bearing.

[0019] By adopting the above technical solution, the designed drive mechanism can drive the drive rod to rotate through the drive motor, and the position movement of the sliding block can be realized through the drive rod in conjunction with the linear bearing and the guide bar.

[0020] In one specific implementation, a strip frame is connected to the frame, one end of the conveying roller is rotatably connected to the strip frame, and an adjusting rod is slidably arranged on the strip frame along the conveying direction, and the adjusting rod can pass through the conveying plane in the vertical direction.

[0021] By adopting the above technical solution, the designed strip frame can provide an installation base for one end of the conveying roller and leave a moving channel for the adjusting rod to move along the conveying direction. The adjusting rod can be used in conjunction with the stop plate to adjust the posture of the material along the conveying direction.

[0022] In one specific implementation scheme, an adjustment control unit is also included, the adjustment control unit comprising: A transverse slide rail is connected to the frame, and a moving block is slidably connected to the transverse slide rail along the conveying direction; An adjusting cylinder is provided, which is connected to the moving block, and the piston rod of the adjusting cylinder is vertically arranged and connected to the adjusting rod.

[0023] By adopting the above technical solution, the designed adjustment control unit can provide sliding guidance for the moving block through the transverse slide rail, and the moving block can serve as the mounting base for the adjustment cylinder. The adjustment cylinder can realize the movement of the adjustment rod in the vertical direction, thereby keeping the adjustment rod below the conveying plane before the material passes through.

[0024] In one specific implementation, the fuel injection unit includes: The mounting cover is slidably connected to the frame and slides along the material conveying direction; Multiple nozzles are provided, which are connected to the mounting cover. The multiple nozzles are distributed perpendicular to the conveying direction and are oriented toward the feeding plane. An oil storage tank is connected to the mounting cover, and the oil storage tank is connected to the nozzle via an oil supply pipe.

[0025] By adopting the above technical solution, the designed oil spraying unit can reduce the possibility of the nozzle being affected by floating dust or air flow in the environment by installing a cover. The oil storage tank and the nozzle can be used to spray drawing oil onto the material.

[0026] In summary, this application includes at least one of the following beneficial technical effects: The designed roller conveyor oiling device facilitates the installation of the oil spraying unit, conveying unit, and drive unit via a frame. The oil spraying unit facilitates the spraying of drawing oil onto the material. The conveying unit allows the material to move from the feeding area to the picking area and through the oil spraying area. The stop plate, centering rod, and drive unit work together to adjust the material's posture, thus eliminating the need for manual posture adjustment. This allows the robot arm to easily pick up the oiled material and transfer it to the next process.

[0027] The designed roller conveyor oiling device uses guide bars as the sliding base for the sliding block and as the mounting base for the drive mechanism. The sliding block can also serve as the mounting base for the centering rod. The drive mechanism enables the sliding block to move, thereby moving the centering rod.

[0028] The designed roller conveyor oiling device can reduce the possibility of the nozzle being affected by floating dust or air flow in the environment by installing a cover. The oil storage tank and the nozzle can be used to spray drawing oil onto the material. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the roller conveyor oiling device according to an embodiment of this application.

[0030] Figure 2 yes Figure 1 Another perspective diagram.

[0031] Figure 3 yes Figure 2 A cross-sectional view through the mounting cover.

[0032] Figure 4 yes Figure 2 A cross-sectional view passing through the drive unit.

[0033] Figure 5 yes Figure 2 A cross-sectional view along the conveying direction.

[0034] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Injection unit; 21. Mounting cover; 22. Nozzle; 23. Oil storage tank; 3. Conveying unit; 31. Conveying roller; 32. Conveying mechanism; 4. Stop plate; 5. Centering rod; 6. Drive unit; 61. Guide bar; 62. Sliding block; 621. Front operating lever; 63. Drive mechanism; 631. Drive motor; 632. Drive rod; 64. Slapping cylinder; 7. Strip frame; 8. Adjusting rod; 9. Adjustment control unit; 91. Transverse slide rail; 92. Moving block; 93. Adjusting cylinder. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0036] This application discloses a roller conveyor oiling device.

[0037] Reference Figure 1 A roller conveyor oiling device includes a frame 1, an oil spraying unit 2, and a conveying unit 3. The oil spraying unit 2 is installed on the frame 1 and forms an oil spraying area. The conveying unit 3 is connected to the frame 1 and forms a feeding plane. The two ends of the feeding plane formed by the conveying unit 3 respectively constitute a feeding area and a picking area. The oil spraying area is located between the feeding area and the picking area. The operator places the material on the feeding area on the feeding plane, and then the conveying unit 3 works to convey the material from the feeding area to the picking area. During the conveying process, the material will pass through the oil spraying area. At this time, the oil spraying unit 2 works to spray drawing oil onto the surface of the material. After the drawing oil is sprayed, the material continues to move under the action of the conveying unit 3 until the material moves to the picking area.

[0038] Reference Figure 1 Specifically, the conveying unit 3 includes conveying rollers 31 and a conveying mechanism 32. There are multiple conveying rollers 31, which are arranged parallel to each other and form a feeding plane. Both ends of the conveying rollers 31 are rotatably connected to the frame 1. The conveying mechanism 32 is connected to the frame 1 and to the conveying rollers 31. It is used to drive the multiple conveying rollers 31 to rotate synchronously. In this application, the conveying mechanism 32 can be multiple motors, with the motor output shaft coaxially connected to the conveying rollers 31. The conveying mechanism 32 can also be a motor, a belt, and multiple pulleys. The motor is connected to the frame 1, and the pulleys are installed on the motor output shaft or the conveying rollers 31. The belt is simultaneously fitted on multiple pulleys. It can also be other structures, as long as it can realize the rotation of the conveying rollers 31. The conveying mechanism 32 can drive the conveying rollers 31 to rotate, thereby moving the material from the feeding area to the picking area.

[0039] Reference Figure 3 There are two spraying units 2, which are located above and below the conveying plane, respectively, to spray the upper and lower surfaces of the material. Specifically, the spraying unit 2 includes a mounting cover 21, a nozzle 22, and an oil storage tank 23. The mounting cover 21 is slidably connected to the frame 1 and slides along the material conveying direction. The mounting cover 21 is located above the feeding plane. The nozzle 22 is connected to the mounting cover 21. There are multiple nozzles 22, which are evenly distributed in a direction perpendicular to the conveying direction and are facing the feeding plane. The oil storage tank 23 is bolted to the mounting cover 21 and is connected to the nozzle 22 flange through a pump body and an oil delivery pipe. The pump body is located inside the oil storage tank 23. The mounting cover 21 can reduce the possibility of the nozzle 22 being affected by floating dust or air flow in the environment. The oil storage tank 23 and the nozzle 22 work together to spray drawing oil onto the material.

[0040] Reference Figure 2 and Figure 4 Furthermore, after the material is coated with drawing oil and moved to the picking area, it is generally picked up by a robotic arm. However, the material may deviate in posture during its movement on the feeding plane. To adjust the material's posture, the roller conveyor oiling device also includes a stop plate 4, a centering rod 5, and a drive unit 6. The stop plate 4 is bolted to the frame 1 and is set perpendicular to the conveying direction. The stop plate 4 is located at the end of the picking area. There are two sets of centering rods 5, and the line connecting the two sets of centering rods 5 is set perpendicular to the conveying direction. Two sets of centering rods 5 are distributed along the width of the feeding plane. The centering rods 5 are located between the oil spraying unit 2 and the stop plate 4. Each set of centering rods 5 includes multiple centering rods 5, such as three or four. The drive unit 6 is connected to the frame 1 and the centering rods 5. It is used to change the distance between the two sets of centering rods 5. The posture of the material can be adjusted by the cooperation of the stop plate 4, the centering rods 5 and the drive unit 6. Thus, the robot can easily pick up the material sprayed with drawing oil and transfer it to the next process without the need for manual posture adjustment.

[0041] Reference Figure 4 To reduce the possibility of scratching the material during material movement caused by the rotation of the conveyor roller 31, the surface of the conveyor roller 31 is covered with a soft anti-scratch film. The frame 1 facilitates the installation of the oil spraying unit 2, the conveying unit 3, and the drive unit 6. The oil spraying unit 2 facilitates the spraying of drawing oil onto the material. The conveying unit 3 allows the material to move from the feeding area to the picking area and through the oil spraying area. The stop plate 4, the centering rod 5, and the drive unit 6 work together to adjust the posture of the material, so that the robot can easily grab the material sprayed with drawing oil and transfer it to the next process without manual posture adjustment.

[0042] Reference Figure 4 Specifically, the drive unit 6 includes a guide bar 61, a sliding block 62, and a drive mechanism 63. The guide bar 61 is bolted to the frame 1 and is located below the feeding plane. There are two sliding blocks 62, which are slidably connected to the guide bar 61. The centering rod 5 is installed on the sliding block 62, and the sliding direction of the sliding rod is perpendicular to the conveying direction. The drive mechanism 63 is connected to the guide bar 61 and the sliding block 62, and is used to drive the sliding block 62 to move. The guide bar 61 can serve as the sliding base of the sliding block 62 and as the mounting base of the drive mechanism 63. The sliding block 62 can serve as the mounting base of the centering rod 5. The drive mechanism 63 can realize the position movement of the sliding block 62, thereby realizing the position movement of the centering rod 5.

[0043] Reference Figure 4 and Figure 5Furthermore, a tapping cylinder 64 is bolted to the sliding block 62. The piston rod of the tapping cylinder 64 is fixedly connected to the centering rod 5 through a connecting rod. When the piston rod of the tapping cylinder 64 slides, it drives the centering rod 5 to slide relative to the sliding block 62 along the sliding direction of the sliding block 62 through the connecting rod.

[0044] Reference Figure 5 Furthermore, in order to prevent the material from shifting beyond the adjustment range of the centering rod 5 after spraying, an extension rod is welded and fixed on the sliding block 62. Multiple front operating rods 621 are welded on the extension rod along the conveying direction. The multiple front operating rods 621 connected to the same extension rod form a front adjustment surface, which is located between the two sets of centering rods 5 on both sides.

[0045] Reference Figure 4 and Figure 5 More specifically, the drive mechanism 63 includes a drive motor 631, a drive rod 632, and a guide rod. The drive motor 631 is bolted to the guide rod 61, and the circumferential direction of the output shaft of the drive motor 631 is parallel to the sliding direction of the sliding block 62. The drive rod 632 is coaxially connected to the output shaft of the drive motor 631, and the drive rod 632 is connected to the sliding block 62 through a linear bearing. There is at least one guide rod, and both ends of the guide rod are slidably connected to two sliding blocks 62 respectively. The guide rod is parallel to the drive rod 632. The drive motor 631 can drive the drive rod 632 to rotate. The drive rod 632 can cooperate with the linear bearing to realize the position movement of the sliding block 62. The guide rod can realize the sliding guidance of the sliding block 62. Reference Figure 5 A strip frame 7 is bolted to the frame 1. One end of the conveying roller 31 is rotatably connected to the frame 1, and the other end is rotatably connected to the strip frame 7. The strip frame 7 is set along the conveying direction. An adjusting rod 8 is slidably set in the strip frame 7 along the conveying direction. The adjusting rod 8 can pass through the conveying plane in the vertical direction. The strip frame 7 can provide an installation base for one end of the conveying roller 31 and leave a moving channel for the adjusting rod 8 to move along the conveying direction. The adjusting rod 8 can be used in conjunction with the stop plate 4 to adjust the posture of the material along the conveying direction.

[0046] Reference Figure 5Specifically, it also includes an adjustment control unit 9. The movement of the adjustment rod 8 along the conveying direction and along the vertical direction is achieved through the adjustment control unit 9. The adjustment control unit 9 includes a transverse slide rail 91, a moving block 92, and an adjustment cylinder 93. The transverse slide rail 91 is welded and fixed to the frame 1. The moving block 92 is slidably connected to the transverse slide rail 91 and slides along the conveying direction. The body of the adjustment cylinder 93 is bolted to the moving block 92, and the piston rod of the adjustment cylinder 93 is set along the vertical direction. The piston rod of the adjustment cylinder 93 is connected to the adjustment rod 8. The transverse slide rail 91 can provide sliding guidance for the moving block 92. The moving block 92 can serve as the mounting base for the adjustment cylinder 93. The adjustment cylinder 93 can realize the movement of the adjustment rod 8 along the vertical direction, thereby keeping the adjustment rod 8 below the conveying plane before the material passes through.

[0047] The implementation principle of the roller conveyor oiling device in this application embodiment is as follows: The worker places the material in the feeding area on the feeding plane. Then, the conveying unit 3 transports the material from the feeding area to the picking area. During the transport process, the material passes through the spraying area. At this time, the spraying unit 2 sprays drawing oil onto the surface of the material. After the drawing oil is sprayed, the material continues to move under the action of the conveying unit 3 until it reaches the picking area and contacts the stop plate 4. Then, the two sets of centering rods 5 move closer or further apart under the drive of the drive unit 6, thereby achieving material attitude control without the need for... Manual posture adjustment facilitates the robotic arm to grasp and transfer the material coated with drawing oil to the next process. The frame 1 facilitates the installation of the oil spraying unit 2, the conveying unit 3, and the drive unit 6. The oil spraying unit 2 facilitates the spraying of drawing oil onto the material. The conveying unit 3 allows the material to move from the feeding area to the picking area and through the oil spraying area. The stop plate 4, the centering rod 5, and the drive unit 6 work together to adjust the posture of the material, thus eliminating the need for manual posture adjustment and allowing the robotic arm to grasp and transfer the material coated with drawing oil to the next process.

[0048] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A roller conveyor oiling device, characterized in that: include: A frame (1) is provided, on which an oil injection unit (2) is connected, and an oil injection zone is formed at the oil injection unit (2). The conveying unit (3) is connected to the frame (1) and forms a feeding plane. The two ends of the feeding plane formed by the conveying unit (3) are respectively formed with a feeding area and a picking area. The oil spraying area formed by the oil spraying unit (2) is located between the feeding area and the picking area. Stop plate (4), the stop plate (4) is connected to the frame (1) and is set perpendicular to the conveying direction, and the stop plate (4) is located in the material picking area; Two sets of centering rods (5), the line connecting the two sets of centering rods (5) is set perpendicular to the conveying direction, and the centering rods (5) are located between the oil injection unit (2) and the stop plate (4); A drive unit (6) for changing the spacing between two sets of centering rods (5), the drive unit (6) is connected to the frame (1), and the drive unit (6) is connected to the centering rod (5).

2. The roller conveyor oiling device according to claim 1, characterized in that: The conveying unit (3) includes: Multiple conveying rollers (31) are arranged parallel to each other and form a feeding plane, and the conveying rollers (31) are rotatably connected to the frame (1). A conveying mechanism (32) for driving the conveying roller (31) to rotate, the conveying mechanism (32) being connected to the frame (1) and the conveying mechanism (32) being connected to the conveying roller (31).

3. The roller conveyor oiling device according to claim 2, characterized in that: The surface of the conveying roller (31) is covered with a soft, scratch-resistant film.

4. The roller conveyor oiling device according to claim 2, characterized in that: The driving unit (6) includes: Guide bar (61), the guide bar (61) is connected to the frame (1), and the guide bar (61) is located below the feeding plane; Two sliding blocks (62) are slidably connected to the guide bar (61), and the centering rod (5) is installed on the sliding block (62). The sliding direction of the sliding rod is perpendicular to the conveying direction. A drive mechanism (63) is connected to the guide bar (61) and the drive mechanism (63) is connected to the sliding block (62).

5. The roller conveyor oiling device according to claim 4, characterized in that: A tapping cylinder (64) is installed on the sliding block (62). The piston rod of the tapping cylinder (64) is connected to the centering rod (5) through a connecting rod, so that the centering rod (5) can slide relative to the sliding block (62) along the sliding direction of the sliding block (62).

6. The roller conveyor oiling device according to claim 4, characterized in that: Two outer limiting plates are installed on the guide strip (61), and the sliding block (62) slides in the sliding area between the two outer limiting plates.

7. The roller conveyor oiling device according to claim 4, characterized in that: The drive mechanism (63) includes: A drive motor (631) is connected to the guide bar (61), and the axial direction of the output shaft of the drive motor (631) is parallel to the sliding direction of the sliding block (62). A drive rod (632) is coaxially connected to the output shaft of the drive motor (631), and the drive rod (632) is connected to the sliding block (62) via a linear bearing.

8. The roller conveyor oiling device according to claim 2, characterized in that: A strip frame (7) is connected to the frame (1). One end of the conveying roller (31) is rotatably connected to the strip frame (7). An adjusting rod (8) is slidably arranged on the strip frame (7) along the conveying direction. The adjusting rod (8) can pass through the conveying plane in the vertical direction.

9. The roller conveyor oiling device according to claim 8, characterized in that: It also includes an adjustment control unit (9), which includes: A transverse slide rail (91) is connected to the frame (1), and a moving block (92) is slidably connected on the transverse slide rail (91) along the conveying direction; An adjusting cylinder (93) is connected to the moving block (92), and the piston rod of the adjusting cylinder (93) is vertically arranged and connected to the adjusting rod (8).

10. The roller conveyor oiling device according to any one of claims 1-9, characterized in that: The fuel injection unit (2) includes: Mounting cover (21) is slidably connected to the frame (1) and slides along the material conveying direction; Multiple nozzles (22) are connected to the mounting cover (21). The multiple nozzles (22) are distributed perpendicular to the conveying direction and are oriented toward the feeding plane. An oil storage tank (23) is connected to the mounting cover (21), and the oil storage tank (23) is connected to the nozzle (22) through an oil supply pipe.

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