WO2019233320A1

WO2019233320A1 - Megawatt power wheel disk, and megawatt power electricity generation device

Info

Publication number: WO2019233320A1
Application number: PCT/CN2019/088910
Authority: WO
Inventors: 徐义学
Original assignee: Xu Yixue
Priority date: 2018-06-05
Filing date: 2019-05-29
Publication date: 2019-12-12
Also published as: CN208281122U

Abstract

A megawatt power wheel disk (22), and a megawatt power electricity generation device. The megawatt power electricity generation device comprises the megawatt power wheel disk (22), a power connection component, a vertical shaft (11), a spinning sleeve (12), a middle bearing base (13), a traction frame-rotating support bearing (14), a foundation pile (15), a megawatt electricity generator (16), a transmission box (17), a power delivery gear (18), a bottom support surface (19), and a spinning sleeve-rotating support bearing (20). The foundation pile (15) is disposed below the bottom support surface (19). The bottom support surface (19) is connected to the foundation pile (15) via a foundation pile frame (21). A lower end of the vertical shaft (11) is fixed to the foundation pile (15). The spinning sleeve (12) is sleeved on the vertical shaft (11), and connected to the vertical shaft (11). A lower end of the spinning sleeve (12) is connected to the foundation pile (15), and an upper end thereof is connected to the megawatt power wheel disk (22). The spinning sleeve (12) is fitted with a middle bearing and the power delivery gear (18). The middle bearing is connected to the bottom support surface (19). A lower end of the megawatt power wheel disk (22) is connected to the middle bearing base (13). An outer periphery of the megawatt power wheel disk (22) is connected to the power connection component. The power delivery gear (18) is connected to the megawatt electricity generator (16) via the transmission box (17).

Description

Megawatt-level power wheel and megawatt-level power generation device

Technical field

The utility model relates to the technical field of power generation equipment, in particular to a megawatt-level power wheel disk and a megawatt-level power generation device.

Background technique

As we all know, the power of well-known generators generally uses thermal power, hydropower, wind power, nuclear power, solar power. Thermal power uses diesel and coal as the power source. This power source has large consumption and pollutes the environment. Inadequate; Although there is no pollution from hydropower and wind power, it is inconvenient to generate electricity due to the limitation of low terrain and insufficient basic investment. Although nuclear power generation has low power generation costs, due to the supporting construction of nuclear reactors, it also has a large amount of investment. The depletion of nuclear waste will also pose a great threat to humanity.

Therefore, CN2003201247174 discloses a livestock power generator on the Internet. Although the use of livestock power for power generation reduces pollution, protects the environment, and generates a large amount of power, it still has the following disadvantages: 1. Because the diameter of the storage wheel is very large, the weight is also very large. Large, not only inconvenient during the installation or removal process, but also deformation of the animal power wheel; Second, the structure is complex and the equipment cost is high; Third, the animal power cannot be limited according to a specific megawatt number; Fourth, It is not possible to restrict animal power at work; five, garbage and manure generated during the work of animal power cannot be automatically processed; and six, for civilian power in remote areas, it cannot be converted into megawatt-level power generation.

Summary of the Invention

The purpose of the utility model is to solve the shortcomings of the existing technology, and provide a simple structure, low equipment cost, environmental protection and pollution-free, large power generation, continuous power generation day and night, and can convert small power into megawatt-level power as required. Megawatt-level power wheel and megawatt-level power generation device.

The technical solution adopted by the utility model to solve its technical problems is:

A megawatt-level power roulette includes a roulette body, which is characterized in that the roulette body is composed of an upper connecting rod, a lower connecting rod, a hub and a connecting ring, and the hub is coaxial with the connecting ring. An upper connecting rod and a lower connecting rod are provided in a circumferentially spaced array between the hub and the connecting ring. One end of the upper connecting rod is fixedly connected to the wheel disc at the upper end of the hub after the clockwise rotation, and the other end is fixedly connected to the connecting ring. After counterclockwise rotation, one end is fixedly connected to the wheel disc at the lower end of the hub, and the other end is fixedly connected to the connecting ring, so as to achieve the functions of light weight and convenient disassembly.

The utility model can also be achieved by the following measures:

A megawatt-level power wheel disc includes a wheel disc body, which is characterized in that the wheel disc body is composed of a traction frame, a hub, an upper fixing cover, a lower fixing cover, a fixing bolt, a nut, and a connecting ring. The connecting ring is coaxial, and the upper end of the wheel hub is fixedly connected to the upper fixing cover via a bearing, and the lower end is fixedly connected to the lower fixing cover. The circumferential array between the wheel hub and the connecting ring is provided with a traction frame. The traction frame is composed of a lower truss, The upper truss and the connecting frame at the inner end of the upper truss and the lower truss form a triangular frame. The upper truss at the inner end of the traction frame is fixedly connected to the upper fixing cover via fixing bolts and nuts, and the lower truss is fixedly connected to the lower fixing cover through fixing bolts and nuts. After the outside of the traction frame is fixedly connected with the connecting ring, the light weight and convenient disassembly and assembly can be achieved.

The utility model can be provided with an upper positioning rod and a lower positioning rod in a circumferential array between the hub and the connecting ring. One end of the upper positioning rod is fixedly connected to the upper fixing cover, and the other end is fixedly connected to the outer end of the traction frame. One end is fixedly connected to the lower fixing cover, and the other end is fixedly connected to the outer end of the traction frame to make the traction frame firm and stable during use and ensure the safe operation of the equipment.

A megawatt-level power generation device, which is characterized by including the megawatt-level power wheel disc, power connection components, a vertical shaft, a rotating sleeve, a middle bearing seat, a traction slewing bearing, a foundation pile, and a megawatt-level power generator as described above. Machine, gearbox, power transmission gear, supporting bottom surface and slewing bearing. The supporting bottom surface is provided with a foundation pile, the supporting bottom surface is fixedly connected to the foundation pile through a supporting pile frame, and the lower end of the vertical shaft is fixed to the foundation pile. On the vertical shaft, a rotary sleeve is sleeved, the rotary sleeve is fixedly connected to the vertical shaft via a bearing, the lower end of the rotary sleeve is fixedly connected to the foundation pile via a rotary sleeve slewing bearing, and the upper end is fixedly connected to a megawatt-level power wheel disc. The rotating sleeve is fixed with a middle bearing and a power transmission gear. The middle bearing is fixedly connected to the supporting bottom surface through a middle bearing seat. The lower end of the megawatt-class power wheel disc is fixedly connected to the middle bearing seat through a slewing bearing of a traction frame. The outer periphery of the megawatt-level power wheel is connected with a power connection component, and the power transmission gear is connected to a megawatt-level generator through a gearbox. In order to drive the dynamic megawatt-level power wheel and rotary sleeve to rotate around the vertical axis through the power connection components, the power transmission gear on the rotary sleeve transmits power to the megawatt-level generator through the gearbox for power generation, which not only achieves The structure is simple, the equipment cost is low, the disassembly and assembly are convenient, and the small power is directly converted into megawatt-level power generation.

In the utility model, a connecting shaft can be provided in the radial direction evenly on the outer periphery of the megawatt-class power wheel disk. The connecting shaft is provided with a rolling wheel. A lower part of the rolling wheel is provided with a wheel supporting device. The device includes a ring-shaped sleeper, a lifting device and a ring-shaped slide. The lower end of the lifting device is fixedly connected to the supporting pile frame, and the upper end is fixedly connected to the ring-shaped sleeper. The ring-shaped sleeper is fixed at the upper end with the ring-shaped slide, and the lower end of the rolling wheel is connected with the ring-shaped slide. The roads are in conflict to facilitate the support of the megawatt-level power roulette through the roulette support device, which further achieves a stable operation.

The power connection component of the utility model can be a livestock traction component, which includes a livestock traction rod, a livestock fixing sleeve, and a traction hook. The livestock fixing sleeve is fixed on the connecting shaft, and the connecting ring between adjacent connecting shafts is fixed radially. There is a livestock traction rod, and a traction hook is installed on the livestock traction rod, which is beneficial to restrict the livestock through the livestock fixing sleeve and the traction hook, which greatly saves manpower.

The power connection component of the utility model can also be a small power motor driving component, which includes a motor fixing seat, a small driving motor and a driving gear. At least three motor fixing seats are uniformly arranged on the outside of the megawatt-level power wheel. The lower end of the motor fixing seat is fixedly connected to the support bottom surface, and a small driving motor is fixed at the upper end. At least three small motors are connected in parallel to the power source. The output shaft of the small driving motor is provided with a driving gear, and the megawatt-level power wheel An external ring gear is fixed on the connecting shaft on the outer periphery of the disk. The external ring gear meshes with the driving gear, so as to facilitate the conversion of power through a small motor and a megawatt-level power wheel to form a megawatt-level power output.

When livestock traction components are used, the utility model can be provided with a speed limiter on the power transmission gear, and the speed limiter can be a reduction motor that meshes with the power transmission gear via the reduction gear to facilitate the adjustment of the speed reduction gear. The rotating sleeve exerts a set resistance, so that the speed of the livestock can be controlled, and the power output of the megawatt-level generator is stable.

The utility model can also be provided with an operating room cover above the megawatt-class power wheel. The outer periphery of the operating room cover is fixedly connected to the supporting bottom surface through a surrounding wall, and an access channel is provided on the surrounding wall to facilitate in any climate. Can generate electricity.

The utility model can also be provided with a livestock working lane corresponding to the livestock traction part on the support bottom surface, and an automatic manure collection device is arranged below the livestock working lane. The livestock working lane is provided with a mesh-shaped through hole so that The feces generated during the operation flows into the automatic feces collection device below through the mesh through hole, and then flows into the external feces tank through the automatic feces collection device to ensure the safety and hygiene of the work site.

Due to the adoption of the above structure, the utility model has the advantages of simple structure, low equipment cost, environmental protection and pollution-free, large power generation, continuous power generation day and night, and conversion of small power into megawatt-level power according to needs.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of a first embodiment of a megawatt-class power wheel of the present invention.

FIG. 2 is a schematic structural diagram of a second embodiment of a megawatt-level power wheel according to the present invention.

FIG. 3 is a schematic structural diagram of a first embodiment of a megawatt-level power generating device according to the present invention.

FIG. 4 is a schematic structural diagram of a second embodiment of a megawatt-level power generating device according to the present invention.

FIG. 5 is a schematic structural diagram of a third embodiment of a megawatt-level power generating device according to the present invention.

FIG. 6 is a sectional view of FIG. 4 or FIG. 5.

Reference signs: hub 2, connecting ring 3, upper connecting rod 4, lower connecting rod 5, traction frame 6, hub 2, upper fixing cover 7, lower fixing cover 8, upper positioning rod 9, lower positioning rod 10, MW Stage power wheel disc 22, power connection parts, vertical shaft 11, rotating sleeve 12, middle bearing block 13, traction slewing bearing 14, foundation pile 15, megawatt-level generator 16, transmission 17, power transmission gear 18, support Bottom surface 19, swivel slewing bearing 20, support pile frame 21, megawatt-level power wheel disc 22, connecting shaft 23, rolling wheel 24, ring sleeper 25, lifting device 26, ring slide 27, livestock tow bar 28, livestock Fixing sleeve 29, traction hook 30, motor fixing base 31, small driving motor 32, driving gear 33, speed limiter 34, operating room cover 35, peripheral wall 36, access path 37, livestock working path 38, automatic manure collection device 39.

Detailed ways

The following describes the utility model with reference to the drawings and embodiments.

As shown in FIG. 1, a megawatt-level power roulette includes a roulette body, which is characterized in that the roulette body is composed of an upper connecting rod 4, a lower connecting rod 5, a hub 2 and a connecting ring 3. The hub 2 and the connecting ring 3 are coaxial, and an upper connecting rod 4 and a lower connecting rod 5 are arranged in a circumferentially spaced array between the hub 2 and the connecting ring 3. One end of the upper connecting rod 4 rotates clockwise with the upper end of the hub 2. The lower end of the lower connecting rod 5 is fixedly connected to the wheel 2 at the lower end of the hub 2 and the other end is fixedly connected to the connecting ring 3 to achieve light weight, Easy disassembly.

The utility model can also be achieved by the following measures:

As shown in FIG. 2, a megawatt-level power roulette includes a roulette body, which is characterized in that the roulette body is composed of a traction frame 6, a hub 2, an upper fixing cover 7, a lower fixing cover 8, and a fixing bolt. , The nut 2 and the connecting ring 3, the hub 2 and the connecting ring 3 are coaxial, the upper end of the hub 2 is fixedly connected to the upper fixing cover 7 through the bearing, the lower end is fixedly connected to the lower fixing cover 8, the hub 2 and the connection A traction frame 6 is provided in a circumferential array between the three rings. The traction frame 6 is a triangular frame formed by a lower truss, an upper truss, and a connecting frame of the upper and lower trusses. The upper truss at the inner end of the traction frame 6 is fixed by bolts and The nut is fixedly connected to the upper fixing cover 7; the lower truss is fixedly connected to the lower fixing cover 8 through fixing bolts and nuts; the outside of the traction frame 6 is fixedly connected to the connecting ring 3 to achieve the functions of light weight and convenient disassembly.

The utility model can be provided with an upper positioning rod 9 and a lower positioning rod 10 in a circumferential array between the hub 2 and the connecting ring 3. One end of the upper positioning rod 9 is fixedly connected to the upper fixing cover 7, and the other end is fixed to the outer end of the traction frame 6. One end of the lower positioning rod 10 is fixedly connected to the lower fixing cover 8 and the other end is fixedly connected to the outer end of the traction frame 6 to make the traction frame 6 firm and stable during use and ensure the safe operation of the equipment.

A megawatt-level power generating device, which is characterized by including the megawatt-level power wheel disc 22, power connection components, vertical shaft 11, rotary sleeve 12, middle bearing block 13, and traction frame slewing support as described in FIG. 1 or FIG. 2 above. Bearing 14, foundation pile 15, megawatt-level generator 16, gearbox 17, power transmission gear 18, support bottom surface 19 and rotary sleeve slewing bearing 20, a foundation pile 15 is provided below the support bottom surface 19, and the support bottom surface 19 is fixedly connected to the foundation pile 15 via the supporting pile frame 21, the lower end of the vertical shaft 11 is fixed to the foundation pile 15, the rotary shaft 11 is sleeved with a rotary sleeve 12, and the rotary sleeve 12 is fixedly connected to the vertical shaft 11 through a bearing. The lower end of the rotary sleeve 12 is fixedly connected to the foundation pile 15 through a rotary sleeve slewing bearing 20 and the upper end is fixedly connected to a megawatt-level power wheel disk 22. The rotary sleeve 12 is fixedly sleeved with a middle bearing and a power transmission gear 18. The middle bearing is fixedly connected to the supporting bottom surface 19 through the middle bearing seat 13, and the lower end of the megawatt-level power wheel disc 22 is fixedly connected to the middle bearing block 13 via a slewing bearing 14 of the drag frame. Power connection The power transmission gear 18 is connected to the megawatt-level generator 16 via the gearbox 17 so as to facilitate the driving of the megawatt-level power wheel disk 22 and the rotation sleeve 12 through the power connection part to rotate around the vertical axis 11 axis. The power transmission gear 18 on the rotating sleeve 12 transmits power to the megawatt-level generator 16 via the gearbox 17 to generate electricity, which not only achieves a simple structure, low equipment cost, convenient disassembly and assembly, but also enables small power to be directly converted into megawatts. Watt-level electricity generation.

According to the present invention, a connecting shaft 23 can be evenly distributed on the outer periphery of the megawatt-level power wheel disk 22, and the connecting shaft 23 is provided with a rolling wheel 24, and a lower part of the rolling wheel 24 is provided with a disk supporting device. The roulette support device includes a ring-shaped sleeper 25, a lifting device 26, and a ring-shaped slideway 27. The lower end of the lifting device 26 is fixedly connected to the supporting pile frame 21, the upper end is fixedly connected to the ring-shaped sleeper 25, and the ring-shaped sleeper 25 is fixed at the upper end. Circular slideway 27, the lower end of the rolling wheel 24 is in conflict with the circular slideway 27, so as to facilitate the support of the megawatt-level power wheel disc by the wheel disc support device, and further achieve the function of stable operation.

The power connection component of the present invention can be a livestock traction component, which includes a livestock traction rod 28, a livestock fixing sleeve 29, and a traction hook 30. The livestock fixing sleeve 29 is fixed on the connecting shaft 23, and a space between adjacent connecting shafts 23 A livestock traction rod 28 is fixed radially on the connecting ring 3, and a traction hook 30 is installed on the animal traction rod 28, which is beneficial to restrict the livestock through the livestock fixing sleeve 29 and the traction hook 30, and greatly saves manpower.

The utility model can be provided with a speed limiter 34 on the power transmission gear 18, and the speed limiter 34 can be a reduction motor. The reduction motor is meshed with the power transmission gear 18 through the reduction gear to facilitate the application of the rotation sleeve. The set resistance makes the speed of livestock controllable and guarantees the stable power output of megawatt-level generators.

The utility model can also be provided with an operating room cover 35 above the megawatt-level power wheel disk 22, and the outer periphery of the operating room cover 35 is fixedly connected to the support bottom surface 19 through a surrounding wall 36, and the access wall 37 is provided on the surrounding wall 36 To facilitate power generation in any climate.

The utility model can also be provided with a livestock working path 38 on the supporting bottom surface 19 corresponding to a livestock traction component, and an automatic manure collection device 39 is arranged below the livestock working path 38. A mesh-shaped communication is provided on the livestock working path 38. Holes, so that the feces generated by livestock during the operation flow into the automatic feces collection device below through the mesh through holes, and then flow into the external feces tank through the automatic feces collection device to ensure the safety and hygiene of the work site.

The power connection component of the utility model can also be a small power motor driving component, which includes a motor fixing base 31, a small driving motor 32, and a driving gear 33. At least three motors are evenly arranged on the outside of the megawatt-level power wheel disk 22. A fixed base 31, the lower end of the motor fixed base 31 is fixedly connected to the support bottom surface 19, and the upper end is fixed with a small driving motor 32. At least three small motors 32 are connected in parallel to a power source, and the output shaft of the small driving motor 32 is provided with A driving gear 33. An external ring gear is fixed on the connecting shaft 23 on the outer periphery of the megawatt-level power wheel disk 22. The external ring gear meshes with the driving gear 33 to facilitate the use of a small motor and a megawatt-level power wheel disk. Power conversion to form a megawatt-level power output.

The lifting device of the utility model generally uses a combination of a lifting screw and a fixed nut to lift the ring sleeper.

When the utility model is used,

When the power connection component adopts a livestock traction component, the operator pulls the livestock into the surrounding wall through the entry and exit channels, sets the livestock fixing sleeve in the livestock body, and then hooks the livestock fixing sleeve and the traction hook on the livestock tow bar one by one to drive out Livestock, livestock pull the megawatt-level power wheel in the enclosure to rotate, driving the power transmission gear at the lower end of the rotary sleeve to rotate. The power transmission gear transmits the power to the megawatt-level generator for power generation through the gearbox. When the walking speed of the livestock When it is too fast, resistance is applied to the power transmission gear through the speed limiter, so that the rotary sleeve always rotates at a stable speed, and then a stable megawatt-level power generation is obtained.

When the power connection part is driven by a small power motor, the operator can turn on the power, and the small power motor on the periphery of the megawatt-level power wheel rotates, which drives the megawatt-level power wheel to rotate, and drives the rotary sleeve and the lower end of the rotary sleeve. The power transmission gear rotates, and the power transmission gear shifts the power through the gearbox to the megawatt-level generator for power generation.

Claims

A megawatt-level power roulette includes a roulette body, which is characterized in that the roulette body is composed of an upper connecting rod, a lower connecting rod, a hub and a connecting ring, and the hub is coaxial with the connecting ring. An upper connecting rod and a lower connecting rod are provided in a circumferentially spaced array between the hub and the connecting ring. One end of the upper connecting rod is fixedly connected to the wheel disc at the upper end of the hub after the clockwise rotation, and the other end is fixedly connected to the connecting ring. After rotating counterclockwise, one end is fixedly connected to the wheel disc at the lower end of the hub, and the other end is fixedly connected to the connecting ring.
A megawatt-level power wheel disc includes a wheel disc body, which is characterized in that the wheel disc body is composed of a traction frame, a hub, an upper fixing cover, a lower fixing cover, a fixing bolt, a nut, and a connecting ring. The connecting ring is coaxial, and the upper end of the wheel hub is fixedly connected to the upper fixing cover via a bearing, and the lower end is fixedly connected to the lower fixing cover. The circumferential array between the wheel hub and the connecting ring is provided with a traction frame. The traction frame is composed of a lower truss, The upper truss and the connecting frame at the inner end of the upper truss and the lower truss form a triangular frame. The upper truss at the inner end of the traction frame is fixedly connected to the upper fixing cover via fixing bolts and nuts, and the lower truss is fixedly connected to the lower fixing cover through fixing bolts and nuts. After the outside of the traction frame is fixedly connected with the connecting ring.
The megawatt-class power wheel according to claim 2, wherein an upper positioning rod and a lower positioning rod are provided in a circumferential array between the hub and the connecting ring, and one end of the upper positioning rod is fixedly connected to the upper fixing cover, and One end is fixedly connected to the outer end of the traction frame, one end of the lower positioning rod is fixedly connected to the lower fixing cover, and the other end is fixedly connected to the outer end of the traction frame.
A megawatt-level power generating device, comprising the megawatt-level power wheel according to claim 1 or 2 or 3, a power connection component, a vertical shaft, a rotary sleeve, a middle bearing seat, a traction slewing bearing, and a foundation. A pile, a megawatt-level generator, a gearbox, a power transmission gear, a supporting bottom surface and a slewing bearing. The supporting bottom surface is provided with a foundation pile, and the supporting bottom surface is fixedly connected to the foundation pile through a supporting pile frame. The lower end of the vertical shaft is fixed on the foundation pile. The vertical shaft is sleeved with a rotary sleeve. The rotary sleeve is fixedly connected to the vertical shaft via a bearing. The lower end of the rotary sleeve is fixedly connected to the foundation pile via a rotary sleeve slewing bearing. The upper end is connected to the megawatt class. The power wheel is fixedly connected. The rotating sleeve is fixed with a middle bearing and a power transmission gear. The middle bearing is fixedly connected to the support bottom surface through a middle bearing seat. The lower end of the megawatt-level power wheel is supported by a slewing bearing. It is fixedly connected to the middle bearing seat, the outer periphery of the megawatt-level power wheel disc is connected with the power connection component, and the power transmission gear is connected to the megawatt-level generator via the gearbox. Connection.
The megawatt-level power generating device according to claim 4, characterized in that the outer periphery of the megawatt-level power wheel is uniformly provided with a connecting shaft in a radial direction, and the connecting shaft is provided with a rolling wheel, and the rolling The lower part of the wheel is provided with a roulette support device. The roulette support device includes an annular sleeper, a lifting device and an annular slide. The lower end of the lifting device is fixedly connected to the supporting pile frame, the upper end is fixedly connected to the annular sleeper, and the upper end of the annular sleeper. An annular slide is fixed, and the lower end of the rolling wheel is in conflict with the annular slide.
The megawatt-level power generating device according to claim 5, characterized in that the power connection component is a livestock traction component, which comprises a livestock traction rod, a livestock fixing sleeve and a traction hook, and the livestock fixing sleeve is fixed on the connection On the shaft, a connecting rod between adjacent connecting shafts is radially fixed with a livestock traction rod, and the livestock traction rod is provided with a traction hook.
The megawatt-level power generating device according to claim 5, wherein the power connection component is a small power motor driving component, which comprises a motor fixing seat, a small driving motor and a driving gear, and the megawatt power At least three motor mounts are uniformly arranged on the outside of the roulette. The lower end of the motor mount is fixedly connected to the support bottom surface, and a small drive motor is fixed at the upper end. At least three small motors are connected in parallel to the power supply. The output of the small drive motor A driving gear is provided on the shaft, and an external ring gear is fixed on the connecting shaft on the outer periphery of the megawatt-level power wheel disc, and the external ring gear is in mesh with the driving gear.
The megawatt-level power generating device according to claim 6, characterized in that a speed limiter is provided on the power transmission gear, and the speed limiter can be a reduction motor, and the reduction motor is transmitted through the reduction gear and the power. The gears mesh.
The megawatt-level power generating device according to claim 6 or 7 or 8, characterized in that an operating room cover is provided above the megawatt-level power wheel, and an outer periphery of the operating room cover is fixed to the supporting bottom surface through a surrounding wall. Connection, the enclosure wall is provided with an access passage.
The megawatt-level power generating device according to claim 9, characterized in that a livestock working lane is provided on the support bottom surface corresponding to a livestock traction component, and an automatic manure collection device is arranged below the livestock working lane, and the livestock A mesh-shaped through hole is provided on the working path.