Automobile sound insulation cotton slitting device

Abstract

The utility model relates to the technical field of production and processing of automobile sound insulation cotton, especially to an automobile sound insulation cotton slitting device, which comprises a slitting device main body, a material loading assembly, a limiting assembly and a material collecting assembly, and the slitting device main body comprises a smooth workbench, in the utility model, the device can adjust the position of the limiting block through the second electric telescopic rod, and then the sound insulation cotton raw material in the form of a roll and a whole piece with different widths is limited through the paired limiting discs, the interval between the paired limiting plates is adjusted through the rotatable adjusting shaft, the sound insulation cotton raw material is assisted in positioning through the paired limiting plates, and the sound insulation cotton raw material is prevented from being skewed, the device can process the sound insulation cotton raw material in the form of a roll and a whole piece with appropriate widths according to the shape and size of the automobile sound insulation cotton, the sound insulation cotton raw material is not wasted, the device has higher flexibility, and is simple to operate, time-saving and labor-saving.

Description

Technical Field

[0001] This utility model relates to the field of automotive sound insulation cotton production and processing technology, specifically an automotive sound insulation cotton slitting device. Background Technology

[0002] An automotive sound insulation cotton slitting device is a mechanical device used to process automotive sound insulation cotton. The automotive sound insulation cotton slitting device usually uses a hydraulic cutting machine with interchangeable dies to punch and cut a whole piece of sound insulation cotton raw material, so as to cut automotive-specific sound insulation cotton of specific size and shape from the whole piece of sound insulation cotton raw material to meet the needs of different parts of the car interior.

[0003] Existing automotive sound insulation cotton slitting devices have relatively simple structures and can only position and cut rolls of sound insulation cotton material of a specific width. However, the shape and size of sound insulation cotton in different parts of the automotive interior vary greatly. Using rolls of sound insulation cotton material of a single width for cutting will result in waste of sound insulation cotton material. Therefore, an automotive sound insulation cotton slitting device is proposed to address the above problems. Utility Model Content

[0004] The purpose of this utility model is to provide an automotive sound insulation cotton slitting device to solve the problem that some existing automotive sound insulation cotton slitting devices can only position and cut rolls of sound insulation cotton raw materials of a specific width, which will cause waste of sound insulation cotton raw materials.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A cutting device for automotive sound insulation cotton includes a cutting device body, a material loading assembly, a limiting assembly, and a receiving assembly. The cutting device body includes a smoothing worktable, with a hydraulic cutting machine fixedly connected to the upper side of the smoothing worktable. A material loading assembly is located on the upper side of the cutting device body. The material loading assembly includes two fixed shafts located on the left and right sides of the hydraulic cutting machine, respectively. The lower side of each fixed shaft is fixedly connected to the smoothing worktable. A sliding shaft, slidably connected to the upper side of the smoothing worktable, is located directly behind each fixed shaft. A first electric telescopic rod, fixedly connected to the upper side of the smoothing worktable, is located behind each sliding shaft. The piston rod of each first electric telescopic rod is fixedly connected to the sliding shaft. A first drive motor, with its main shaft passing through the fixed shaft, is fixedly connected to the front side of each fixed shaft. A transmission prism is fixedly connected to the rear end of each drive motor's main shaft. The transmission prism is inserted into the front end of a material loading roller located between the fixed shaft and the sliding shaft. The front end of each material loading roller is rotatably connected to the fixed shaft, and the rear end of each material loading roller is rotatably connected to the sliding shaft. A pair of mounting brackets on the fixed shaft and the sliding shaft... Each slot is fixedly connected with a second electric telescopic rod, and the piston rod of each second electric telescopic rod is fixedly connected with a limit block. A pair of limit plates are slidably connected to the outer side of each material carrier roller. A limit assembly is provided on the upper side of the main body of the cutting device. The limit assembly includes two pairs of third electric telescopic rods fixedly connected to the smooth worktable. The two pairs of third electric telescopic rods are located on the left and right sides of the hydraulic cutting machine, respectively. Each third electric telescopic rod is located between two material carrier rollers. A first rotating seat is fixedly connected to the upper side of each third electric telescopic rod. A limit roller is rotatably connected between the two pairs of first rotating seats. Two pairs of second rotating seats are fixedly connected to the upper side of the smooth worktable. Each second rotating seat is located on the side of the first rotating seat closer to the hydraulic cutting machine. An adjusting shaft is rotatably connected between the two pairs of second rotating seats. A second drive motor is fixedly connected to the front end of each of the two second rotating seats located on the front side. The main shaft of each second drive motor is fixedly connected to the adjusting shaft. A pair of limit plates that fit against the upper side of the smooth worktable are threadedly connected to the outer side of each adjusting shaft.

[0007] Preferably, the main body of the slitting device is provided with a receiving assembly inside. The receiving assembly includes a mounting shell located in the mounting groove of the smooth worktable and fixedly connected to the smooth worktable. A pair of tensioning shafts are rotatably connected inside the mounting shell. A pair of third drive motors fixedly connected to the front side of the mounting shell and fixedly connected to the smooth worktable are fixedly connected. The main shafts of the third drive motors are all fixedly connected to the front end of the tensioning shafts. A tensioned conveyor belt is sleeved on the outside of the tensioning shafts.

[0008] Preferably, each pair of limiting discs has an annular limiting track on its opposite side, each pair of limiting blocks is located within the annular limiting track of the limiting disc, and the side of each pair of limiting blocks away from the second electric telescopic rod is in contact with the limiting disc.

[0009] Preferably, the third electric telescopic rods all pass through the smooth worktable, the upper ends of the outer shells of the third electric telescopic rods are aligned with the upper side of the smooth worktable, and the upper and lower ends of the limiting rollers are aligned with the upper and lower ends of the first rotating seat, respectively.

[0010] Preferably, each of the adjusting shafts has a pair of threaded protrusions symmetrically distributed front and back, and each limiting plate is composed of a screw block and a vertical plate, with the two limiting plates in pairs symmetrically distributed front and back.

[0011] Preferably, the conveyor belt is located inside the mounting housing, and the upper side of the mounting housing, the upper side of the third drive motor, and the upper side of the conveyor belt are all aligned with the upper side of the smooth worktable.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] In this invention, the device, equipped with a material-carrying roller, a limiting disc, an adjusting shaft, and a limiting plate, allows for adjustment of the position of the limiting block via a second electric telescopic rod. This, in turn, uses paired limiting discs to limit rolls of sound-insulating cotton material of varying widths. Simultaneously, the rotatable adjusting shaft adjusts the spacing between the paired limiting plates, which assist in positioning the sound-insulating cotton material and prevent skewing. This device can select rolls of sound-insulating cotton material of appropriate width for processing based on the shape and size of the automotive sound-insulating cotton, avoiding waste and offering greater flexibility. Furthermore, it is simple to operate, saving time and effort. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the main structure of the cutting device of this utility model;

[0016] Figure 3 This is a schematic diagram of the material carrier assembly structure of this utility model;

[0017] Figure 4 This is a cross-sectional view of the material carrier assembly structure of this utility model;

[0018] Figure 5 This is a schematic diagram of the limiting component structure of this utility model;

[0019] Figure 6 This is a cross-sectional view of the material receiving component of this utility model.

[0020] In the diagram: 1. Main body of the slitting device; 11. Smooth worktable; 12. Hydraulic cutting machine; 2. Material loading assembly; 21. Fixed shaft; 22. Sliding shaft; 23. First electric telescopic rod; 24. First drive motor; 25. Transmission prism; 26. Material loading roller; 27. Second electric telescopic rod; 28. Limiting block; 29. ​​Limiting disc; 3. Limiting assembly; 31. Third electric telescopic rod; 32. First rotating seat; 33. Limiting roller; 34. Second rotating seat; 35. Adjusting shaft; 36. Second drive motor; 37. Limiting plate; 4. Material receiving assembly; 41. Mounting shell; 42. Tensioning shaft; 43. Third drive motor; 44. Conveyor belt. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0023] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0024] Please see Figure 1-6 This utility model provides a technical solution:

[0025] A cutting device for automotive sound insulation cotton includes a cutting device body 1, a material loading assembly 2, a limiting assembly 3, and a material receiving assembly 4. The cutting device body 1 includes a smooth worktable 11, with a hydraulic cutting machine 12 fixedly connected to the upper side of the smooth worktable 11. The material loading assembly 2 is located on the upper side of the cutting device body 1. The material loading assembly 2 includes two fixed shafts 21 located on the left and right sides of the hydraulic cutting machine 12, respectively. The lower side of each fixed shaft 21 is fixedly connected to the smooth worktable 11. A sliding shaft 22 is provided directly behind each fixed shaft 21 and slidably connected to the upper side of the smooth worktable 11. The rear side of each sliding shaft 22 is provided with... A first electric telescopic rod 23 is fixedly connected to the upper side of the smooth worktable 11. The piston rod of the first electric telescopic rod 23 is fixedly connected to the sliding shaft 22. A first drive motor 24 with a main shaft passing through the fixed shaft 21 is fixedly connected to the front side of the fixed shaft 21. A transmission prism 25 is fixedly connected to the rear end of the main shaft of the first drive motor 24. The transmission prism 25 is inserted into the front end of the material roller 26 located between the fixed shaft 21 and the sliding shaft 22. The front end of the material roller 26 is rotatably connected to the fixed shaft 21, and the rear end of the material roller 26 is rotatably connected to the sliding shaft 22. The fixed shaft 21 and the sliding shaft 22 are... A second electric telescopic rod 27 is fixedly connected to each of the two mounting slots. The piston rods of the second electric telescopic rods 27 are fixedly connected to limit blocks 28. A pair of limit discs 29 are slidably connected to the outer sides of the material rollers 26. A limit assembly 3 is provided on the upper side of the main body 1 of the slitting device. The limit assembly 3 includes two pairs of third electric telescopic rods 31 fixedly connected to the smooth worktable 11. The two pairs of third electric telescopic rods 31 are located on the left and right sides of the hydraulic cutting machine 12, respectively. Each third electric telescopic rod 31 is located between two material rollers 26. A first rotating seat 32 is fixedly connected to the upper side of each third electric telescopic rod 31. Each pair of first rotating seats 32 is rotatably connected to a limiting roller 33. Two pairs of second rotating seats 34 are fixedly connected to the upper side of the smooth worktable 11. The second rotating seats 34 are all located on the side of the first rotating seats 32 near the hydraulic cutting machine 12. An adjusting shaft 35 is rotatably connected between each pair of second rotating seats 34. The front ends of the two second rotating seats 34 located on the front side are fixedly connected to a second drive motor 36. The main shaft of the second drive motor 36 is fixedly connected to the adjusting shaft 35. A pair of limiting plates 37 that fit against the upper side of the smooth worktable 11 are threadedly connected to the outer side of the adjusting shaft 35.

[0026] The slitting device body 1 has a receiving assembly 4 inside. The receiving assembly 4 includes a mounting shell 41 located in the mounting groove of the smooth worktable 11 and fixedly connected to the smooth worktable 11. A pair of tensioning shafts 42 are rotatably connected inside the mounting shell 41. A pair of third drive motors 43 are fixedly connected to the front side of the mounting shell 41 and fixedly connected to the smooth worktable 11. The main shafts of the third drive motors 43 are fixedly connected to the front ends of the tensioning shafts 42. A tensioned conveyor belt 44 is sleeved on the outside of the tensioning shafts 42. The third drive motors 43 can drive the tensioning shafts 42, which are limited by the mounting shell 41, to rotate. Each pair of limiting discs 29 has an annular limiting track on the back side. Each pair of limiting blocks 28 is located in the annular limiting track of the limiting discs 29. The side of each pair of limiting blocks 28 away from the second electric telescopic rod 27 is in contact with the limiting disc 29. The position of the limiting blocks 28 is adjusted by the second electric telescopic rod 27, and then the pairs of limiting discs 29 can handle the rolls of different widths. The sound insulation cotton material is limited; the third electric telescopic rod 31 passes through the smooth worktable 11, and the upper end of the outer shell of the third electric telescopic rod 31 is aligned with the upper side of the smooth worktable 11. The upper and lower ends of the limiting roller 33 are aligned with the upper and lower ends of the first rotating seat 32, respectively. The limiting roller 33 presses the sound insulation cotton material downward to ensure that the sound insulation cotton material is at a suitable height when passing through the lower gap of the hydraulic cutting machine 12; the outer side of the adjusting shaft 35 is provided with a pair of threaded protrusions symmetrically distributed front and back. The limiting plate 37 is composed of a screw block and a vertical plate. The two pairs of limiting plates 37 are symmetrically distributed front and back. The limiting plate 37 can limit the sound insulation cotton material to ensure that the sound insulation cotton is laid flat in the left and right directions without tilting; the conveyor belt 44 is located inside the mounting shell 41. The upper side of the mounting shell 41, the upper side of the third drive motor 43, and the upper side of the conveyor belt 44 are aligned with the upper side of the smooth worktable 11. The conveyor belt 44 can drive the cut automotive sound insulation cotton to move continuously to the right.

[0027] Workflow: Before use, install the smooth worktable 11 in a suitable position and connect the power supply. This device is equipped with an external controller, which is electrically connected to the hydraulic cutting machine 12, the first electric telescopic rod 23, the first drive motor 24, the second electric telescopic rod 27, the third electric telescopic rod 31, the second drive motor 36, and the third drive motor 43. Manually operating the external controller can adjust the operating status of the hydraulic cutting machine 12, the first electric telescopic rod 23, the first drive motor 24, the second electric telescopic rod 27, the third electric telescopic rod 31, the second drive motor 36, and the third drive motor 43. The smooth worktable 11 of this device has very low damping, and the sound insulation cotton can slide on the smooth worktable 11. The conveyor belt 4 of this device... 4. The damping is very high, and the sound insulation cotton can be moved by the conveyor belt 44. The core of the rolled sound insulation cotton material can be fitted onto the outside of the loading roller 26 of the device, and the two can match each other. All of the above are existing technologies. When using the device, the user first changes the appropriate die for the hydraulic cutting machine 12 and determines the width of the rolled sound insulation cotton material required for producing automotive sound insulation cotton. Then, the user uses the external controller to retract the two first electric telescopic rods 23 backward. The first electric telescopic rods 23 drive the sliding shaft 22 to slide backward, which releases the restriction of the fixed shaft 21 and the sliding shaft 22 on the loading roller 26. The loading roller 26 is removed together with the limiting plate 29. The rolled sound insulation cotton material with the core is fitted onto the loading roller 26 located on the left side, and the rolled material is rolled up. The entire piece of sound insulation cotton raw material is disassembled, and its starting end is passed from left to right through the gap between the left-side limiting roller 33 and the smoothing worktable 11, the lower gap of the hydraulic cutting machine 12, and the gap between the right-side limiting roller 33 and the smoothing worktable 11. The starting end of the rolled-up sound insulation cotton raw material is fixed on the waste material winding core. The waste material winding core is then placed on the right-side carrying roller 26, and the paired limiting discs 29 are placed on the carrying roller 26. The two carrying rollers 26 are reinstalled, and then multiple pairs of second electric telescopic rods 27 are simultaneously extended by an external controller. The limiting blocks 28 then push the paired limiting discs 29 closer together, locking the rolled-up sound insulation cotton raw material and the waste material winding core in the middle position of the two carrying rollers 26. Next, the extension length of the third electric telescopic rod 31 is adjusted by the external controller. The limiting roller 33, which is limited by the first rotating seat 32, presses the sound insulation cotton material downward to ensure that the sound insulation cotton material is at a suitable height when passing through the lower gap of the hydraulic cutting machine 12. The second drive motor 36 is rotated by the external controller, which in turn causes the adjusting shaft 35, which is limited by the second rotating seat 34, to rotate, so that the paired limiting plates 37 move closer to each other. The limiting plates 37 can limit the sound insulation cotton material to ensure that the sound insulation cotton is laid flat in the left and right directions without being crooked. Then, the first drive motor 24 located on the right side is adjusted by the external controller. The first drive motor 24 drives the transmission prism 25 inserted into the material carrier roller 26 to rotate, which in turn drives the material carrier roller 26 located on the right side to rotate.The sound insulation cotton material is tensioned, and the limiting block 28 at the end of the second electric telescopic rod 27 can press against the limiting plate 29. The limiting plate 29 can rotate synchronously with the material roller 26. The limiting plate 29 can limit the roll of sound insulation cotton material and waste material winding core. At this time, the hydraulic cutting machine 12, the first drive motor 24 and the third drive motor 43 can be started by the external controller. The external controller can make the two first drive motors 24 rotate at the same speed and the two third drive motors 43 rotate at the same speed, and the hydraulic cutting is performed. The machine 12 can cut according to a preset cutting interval. The hydraulic cutting machine 12 can continuously cut automotive sound insulation cotton of the required shape and size from the sound insulation cotton material. The cut automotive sound insulation cotton is located in the cutting groove of the sound insulation cotton material and can move to the right as the sound insulation cotton material moves as a whole. The cut material can be wound up by the waste roll core. At the same time, the third drive motor 43 can drive the tension shaft 42, which is limited by the mounting shell 41, to rotate, thereby causing the conveyor belt 44 located in the mounting shell 41 to drive the cutting. The finished automotive sound insulation cotton continues to move to the right. Workers only need to collect the produced sound insulation cotton at the right end of the smooth worktable 11. This device uses a rotatable loading roller 26 to rotate the core of the sound insulation cotton roll, allowing the cotton to move under the hydraulic cutting machine 12. The hydraulic cutting machine 12 cuts the sound insulation cotton, and the second electric telescopic rod 27 adjusts the position of the limiting block 28. Pairs of limiting discs 29 then limit the rolls of sound insulation cotton of different widths. Simultaneously, the rotatable loading roller 26... The movable adjusting shaft 35 adjusts the spacing between the paired limiting plates 37, which assist in positioning the sound insulation cotton material and prevent it from tilting. The material carrier roller 26 can also roll up the cut sound insulation cotton waste, and the conveyor belt 44 transports the cut automotive sound insulation cotton. This device can select a suitable width of roll of whole piece sound insulation cotton material according to its shape and size, avoiding waste and offering greater flexibility. It is also simple to operate, saving time and labor.

[0028] Contents not described in detail in this specification are existing technologies known to those skilled in the art. Standard parts used in this invention can all be purchased commercially, and irregularly shaped parts can be custom-made according to the description and drawings. The specific connection methods for each part all employ conventional methods such as bolts, rivets, and welding, which are already mature technologies. The machinery, parts, and equipment all use conventional models from the prior art, and the circuit connections also employ conventional connection methods from the prior art, which will not be detailed here.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cutting device for automotive sound insulation cotton, comprising a cutting device body (1), a material loading assembly (2), a limiting assembly (3), and a material receiving assembly (4), characterized in that: The main body (1) of the slitting device includes a smooth worktable (11), on which a hydraulic cutting machine (12) is fixedly connected. A material loading assembly (2) is provided on the upper side of the main body (1). The material loading assembly (2) includes two fixed shafts (21) located on the left and right sides of the hydraulic cutting machine (12), respectively. The lower sides of the fixed shafts (21) are fixedly connected to the smooth worktable (11). A sliding shaft (22) is provided directly behind each fixed shaft (21) and slidably connected to the upper side of the smooth worktable (11). A first electric telescopic rod (23) is provided behind each sliding shaft (22) and fixedly connected to the upper side of the smooth worktable (11). The piston rods of the first electric telescopic rod (23) are all fixedly connected to the sliding shaft (22). The front side of the fixed shaft (21) is fixedly connected to the first drive motor (24) whose main shaft passes through the fixed shaft (21). The rear end of the main shaft of the first drive motor (24) is fixedly connected to the transmission prism (25). The transmission prism (25) is inserted into the front end of the material roller (26) located between the fixed shaft (21) and the sliding shaft (22). The front end of the material roller (26) is rotatably connected to the fixed shaft (21). The rear end of the material roller (26) is rotatably connected to the sliding shaft (22). A second electric telescopic rod is fixedly connected in a pair of mounting slots of the fixed shaft (21) and the sliding shaft (22). The piston rods of the second electric telescopic rod (27) and the second electric telescopic rod (27) are fixedly connected to limit blocks (28). A pair of limit discs (29) are slidably connected to the outer side of the material roller (26). A limit assembly (3) is provided on the upper side of the main body (1) of the cutting device. The limit assembly (3) includes two pairs of third electric telescopic rods (31) fixedly connected to the smooth worktable (11). The two pairs of third electric telescopic rods (31) are located on the left and right sides of the hydraulic cutting machine (12). The third electric telescopic rods (31) are located between the two material rollers (26). A first rotating seat (32) is fixedly connected to the upper side of the third electric telescopic rod (31). The two pairs of first rotating seats (32) are fixedly connected to the upper side of the third electric telescopic rods (31). Each of the rotating seats (32) is rotatably connected to a limiting roller (33). The upper side of the smooth worktable (11) is fixedly connected to two pairs of second rotating seats (34). The second rotating seats (34) are all located on the side of the first rotating seat (32) close to the hydraulic cutting machine (12). The two pairs of second rotating seats (34) are rotatably connected to an adjusting shaft (35). The front ends of the two second rotating seats (34) located on the front side are fixedly connected to a second drive motor (36). The main shaft of the second drive motor (36) is fixedly connected to the adjusting shaft (35). The outer side of the adjusting shaft (35) is threadedly connected to a pair of limiting plates (37) that fit against the upper side of the smooth worktable (11).

2. The automotive sound insulation cotton slitting device according to claim 1, characterized in that: The main body (1) of the slitting device is provided with a receiving assembly (4). The receiving assembly (4) includes a mounting shell (41) located in the mounting groove of the smooth worktable (11) and fixedly connected to the smooth worktable (11). A pair of tensioning shafts (42) are rotatably connected inside the mounting shell (41). A pair of third drive motors (43) fixedly connected to the front side of the mounting shell (41) and fixedly connected to the smooth worktable (11) are fixedly connected. The main shafts of the third drive motors (43) are all fixedly connected to the front end of the tensioning shafts (42). A tensioned conveyor belt (44) is sleeved on the outside of the tensioning shafts (42).

3. The automotive sound insulation cotton slitting device according to claim 1, characterized in that: Each pair of limiting discs (29) has an annular limiting track on its back side, and each pair of limiting blocks (28) is located within the annular limiting track of the limiting disc (29). The side of each pair of limiting blocks (28) away from the second electric telescopic rod (27) is in contact with the limiting disc (29).

4. The automotive sound insulation cotton slitting device according to claim 1, characterized in that: The third electric telescopic rod (31) passes through the smooth worktable (11). The upper end of the outer shell of the third electric telescopic rod (31) is aligned with the upper side of the smooth worktable (11). The upper and lower ends of the limiting roller (33) are aligned with the upper and lower ends of the first rotating seat (32), respectively.

5. The automotive sound insulation cotton slitting device according to claim 1, characterized in that: The outer side of each adjustment shaft (35) is provided with a pair of threaded protrusions symmetrically distributed front and back. Each limiting plate (37) is composed of a screw block and a vertical plate, and the two limiting plates (37) in pairs are symmetrically distributed front and back.

6. The automotive sound insulation cotton slitting device according to claim 2, characterized in that: The conveyor belt (44) is located inside the mounting housing (41), and the upper side of the mounting housing (41), the upper side of the third drive motor (43), and the upper side of the conveyor belt (44) are all aligned with the upper side of the smooth worktable (11).

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