Modular energy storage converter

Abstract

The invention relates to the technical field of energy storage converters, and provides a modular energy storage converter which comprises a converter body, two sides of the exterior of the converter body are fixedly connected with two plate bodies, one side of the exterior of each of the four plate bodies is fixedly connected with a handle, and one side of the interior of the converter body is provided with four through grooves. Four shielding plates are fixedly connected to one side of the exterior of the converter body, a plurality of network cable ports are formed in one side of the exterior of the converter body, a plurality of wiring ports are installed and connected to one side of the exterior of the converter body, and a dredging mechanism is arranged on one side of the interior of the converter body; the dredging mechanism comprises a plurality of groups of filter screens with different lengths, a mounting plate is mounted and connected to one side wall of an inner cavity of the converter body, a temperature controller is fixedly connected to one side of the mounting plate, and a first electrified wire is fixedly connected to the interior of the temperature controller. By means of the technical scheme, the problem that in the prior art, it is inconvenient to ensure that an air channel in the device is smooth in an unmanned environment for a long time is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage converters, and in particular to a modular energy storage converter. Background Art

[0002] Energy storage converter: It can control the charging and discharging process of the battery, perform AC / DC conversion, and directly supply power to the AC load when there is no power grid. PCS is composed of DC / AC bidirectional converter, control unit, etc. The PCS controller receives background control instructions through communication, and controls the converter to charge or discharge the battery according to the sign and size of the power instruction, so as to adjust the active power and reactive power of the power grid. The PCS controller communicates with the BMS through the CAN interface to obtain the battery pack status information, and can realize protective charging and discharging of the battery to ensure the safe operation of the battery.

[0003] The patent specification with the announcement number CN109830905A discloses a heat dissipation device for a converter grid-connected cabinet, which belongs to the field of power generation technology. It includes a heat dissipation fan and a heat dissipation port installed on the cabinet, wherein two heat dissipation fans are installed at the lower part of the cabinet door and are symmetrically distributed, and the other two heat dissipation fans are installed at the upper part of the cabinet side panel and the cabinet door facing the busbar respectively; the heat dissipation fan installed at the lower part of the cabinet door and the cabinet door facing the busbar is an intake fan, and the heat dissipation fan installed on the cabinet side panel is an exhaust fan, and heat dissipation ports are respectively arranged at the upper part of the cabinet door and the cabinet back panel corresponding to the busbar.

[0004] However, in the implementation of relevant technologies, it was found that the above technical solution has the following problems: the above device needs to introduce external cold air into the inside of the device during use, so it is easy to cause a large amount of dust to adhere to the fan in an unmanned working environment for a long time. When the problem occurs, the heat will be difficult to release and discharge due to the reduction in the amount of cold air entering, which will eventually cause equipment failure. Based on this, further improvement is needed. Summary of the invention

[0005] The present invention proposes a modular energy storage converter, which solves the problem in the related art that it is inconvenient to ensure that the air duct inside the device is unobstructed in an unmanned environment for a long time.

[0006] The technical solution of the present invention is as follows:

[0007] A modular energy storage converter comprises a converter body, two plates are fixedly connected to both sides of the converter body, handles are fixedly connected to one side of the four plates, four through slots are provided on one side of the converter body, four shielding plates are fixedly connected to one side of the converter body, a plurality of network cable ports are provided on one side of the converter body, a plurality of wiring ports are installed and connected to one side of the converter body, and a dredging mechanism is provided on one side of the converter body;

[0008] The dredging mechanism includes multiple groups of filters of different lengths, a mounting plate is installed and connected to one side wall of the inner cavity of the inverter body, a temperature controller is fixedly connected to one side of the mounting plate, a power-on wire 1 is fixedly connected inside the temperature controller, the outer end of the power-on wire 1 is fixedly connected to a PLC controller, a plurality of power-on wires 2 are fixedly connected to the bottom of the PLC controller, and a plurality of power-on wires 2 are fixedly connected to the bottom of each of the transmission controllers, a connector is fixedly connected to one side of the transmission controller, a driving assembly is fixedly connected to one end of the connector, a rotating rod is connected to the inside of the driving assembly via a bearing, four fan blades are fixedly connected to the outside of the rotating rod, a rotating plate is provided on the outside of the fan blades, the rotating plate and the fan blades are connected via a one-way bearing, two short plates are fixedly installed on one side of the rotating plate, a movable plate is fixedly connected to one side of the two short plates, and a plurality of bristles are fixedly connected to one side of the two movable plates.

[0009] Preferably, the four shielding plates are respectively located at the tops of the four through slots, one side of the PLC controller is fixedly connected to a side wall of the inner cavity of the converter body, and the connector is configured to be U-shaped.

[0010] Preferably, the rotating rod extends to the outer side of the inverter body and is connected to the inverter body through a bearing, the rotating plate is located on the outer side of the filter screen, the bristle side is in contact with the outer side of the inverter body, and the multiple filters are in an uncovered state.

[0011] Preferably, the two movable plates and the bristles are distributed in a circular shape, an auxiliary mechanism is provided outside the rotating rod, and the auxiliary mechanism includes a long rod, and the long rod is fixedly connected to one side of the outside of the converter body.

[0012] Preferably, a clamping plate is fixedly connected to the outside of the long rod, the cross-section of the clamping plate is set to be L-shaped, and a circular plate is fixedly installed at one end of the long rod.

[0013] Preferably, a connecting rod is fixedly connected to one side of the clamping plate, and the connecting rod is located at the top of one of the bristles and at one side of the other bristle.

[0014] Preferably, a separation mechanism is provided on the outside of the rotating rod, and the separation mechanism includes a positioning plate, and the positioning plate is fixedly installed on one side of the outside of the converter body, and a card shell is fixedly connected to the bottom of the positioning plate, and a discharge port is opened at the bottom of the card shell.

[0015] Preferably, one side of the card shell is fixedly connected to the outer side of the converter body, and a transverse groove is provided on the inner side of the card shell, and the card plate and the connecting rod both extend to the inner side of the card shell through the transverse groove.

[0016] Preferably, one side of the rotating plate is fixedly connected to a strip plate, one side of the top of the strip plate is fixedly connected to an L-shaped rod, and one end of the L-shaped rod is fixedly connected to one side of one of the movable plates.

[0017] Preferably, the top and bottom of the strip plate are fixedly connected with inclined plates, the strip plate and one side of the two inclined plates are fixedly connected with a square plate, the inside of the square plate is connected with a rotating rod through a bearing, and the two sides of the outside of the rotating rod are respectively fixedly connected with roller body 1 and roller body 2, the roller body 1 and roller body 2 are both in contact with the inside of the card shell, and multiple grooves are opened inside the roller body 1 and roller body 2.

[0018] The working principle and beneficial effects of the present invention are:

[0019] 1. In the present invention, since the rotating rod and the rotating plate are connected by a one-way bearing, the rotating plate will not be driven to rotate by the rotating rod during the rotation of the fan blades. Since there is a certain gap between the multiple filter screens of different lengths, the movable plate and the bristles will basically not affect the amount of air entering the filter screen, thereby ensuring the functionality of air taking away the heat inside the inverter body and solving the problem of inconvenience in ensuring smooth air duct inside the device in an unmanned environment for a long time.

[0020] 2. In the present invention, during the rotation of the bristles, in order to prevent too much dust from accumulating on the surface of the bristles, which would cause the dust to "explode" into the air during the next cleaning, the bristles continuously pass through the inside of the connecting rod during the rotation, that is, the bristles continuously move relative to the connecting rod, so that the impurities and dust on the outside of the bristles are cleaned and separated, and discharged under the action of the breeze flowing to the outside, thereby ensuring the cleaning effect and solving the problem of inconvenience in ensuring the smooth flow of the internal air duct of the device in an unmanned environment for a long time.

[0021] 3. In the present invention, during the rotation of the bristles, in order to prevent too much dust from accumulating on the surface of the bristles, which would cause the dust to "explode" in the air during the next cleaning, the bristles will continuously pass through the inside of the connecting rod during the rotation, that is, the bristles will continuously move relative to the connecting rod, so that the impurities and dust on the outside of the bristles are cleaned and separated, and discharged under the action of the breeze flowing to the outside, thereby ensuring the cleaning effect and preventing the dust from adhering again during the transition of the working state, thus solving the problem of inconvenience in ensuring the smooth flow of the internal air duct of the device in an unmanned environment for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2This is a schematic diagram of the overall structure of the present invention from an upward viewing angle;

[0025] Figure 3 It is a schematic diagram of the overall structure of the present invention from a side view perspective;

[0026] Figure 4 For the present invention Figure 3 A in the enlarged view;

[0027] Figure 5 It is a cross-sectional structural schematic diagram of the present invention;

[0028] Figure 6 It is a partial structural schematic diagram of the present invention;

[0029] Figure 7 It is a schematic diagram of the structural separation of the dredging mechanism in the present invention;

[0030] Figure 8 For the present invention Figure 7 Schematic diagram of partial structural separation in ;

[0031] Fig. 9 For the present invention Figure 8 The enlarged view of point B in the figure;

[0032] Fig.10 It is a schematic diagram of partial structural separation in the present invention;

[0033] Fig.11 For the present invention Fig.10 Enlarged view of point C in the figure.

[0034] In the figure: 1, converter body; 2, plate body; 3, handle; 4, shield; 5, network cable port; 6, wiring port; 7, dredging mechanism; 701, filter; 702, mounting plate; 703, temperature controller; 704, power line 1; 705, PLC controller; 706, power line 2; 707, transmission controller; 708, connector; 709, drive assembly; 710, rotating rod; 711, fan blade; 712, rotating plate; 713, short plate; 714, movable plate; 715, bristles; 8, auxiliary mechanism; 801, long rod; 802, clamping plate; 803, round plate; 804, connecting rod; 9, separation mechanism; 901, positioning plate; 902, jamming shell; 903, strip plate; 904, L-shaped rod; 905, inclined plate; 906, rotating rod; 907, square plate; 908, roller body one; 909, roller body two. DETAILED DESCRIPTION

[0035] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1

[0037] like Figures 1 to 9 As shown, this embodiment proposes a modular energy storage converter, including a converter body 1, two plates 2 are fixedly connected to both sides of the outside of the converter body 1, a handle 3 is fixedly connected to one side of the outside of the four plates 2, four through slots are opened on one side of the inside of the converter body 1, four shielding plates 4 are fixedly connected to one side of the outside of the converter body 1, a plurality of network cable ports 5 are opened on one side of the outside of the converter body 1, a plurality of wiring ports 6 are installed and connected on one side of the outside of the converter body 1, and a dredging mechanism 7 is provided on one side of the inside of the converter body 1;

[0038] The dredging mechanism 7 includes a plurality of filter screens 701 of different lengths, a mounting plate 702 is mounted on one side wall of the inner cavity of the converter body 1, a temperature controller 703 is fixedly connected to one side of the mounting plate 702, a power line 1 704 is fixedly connected to the inside of the temperature controller 703, a PLC controller 705 is fixedly connected to the outer end of the power line 1 704, a plurality of power lines 2 706 are fixedly connected to the bottom of the PLC controller 705, a transmission controller 707 is fixedly connected to the bottom of the plurality of power lines 2 706, and a transmission controller 707 is fixedly connected to one side of the transmission controller 707 There is a connector 708, one end of which is fixedly connected to a driving assembly 709, the inside of the driving assembly 709 is connected to a rotating rod 710 through a bearing, the outside of the rotating rod 710 is fixedly connected to four fan blades 711, a rotating plate 712 is provided outside the fan blades 711, the rotating plate 712 and the fan blades 711 are connected through a one-way bearing, two short plates 713 are fixedly installed on one side of the rotating plate 712, one side of the two short plates 713 are fixedly connected to a movable plate 714, and one side of the two movable plates 714 are fixedly connected to a plurality of bristles 715.

[0039] In this embodiment, the four shielding plates 4 are respectively located at the tops of the four through slots, one side of the PLC controller 705 is fixedly connected to a side wall of the inner cavity of the converter body 1 , and the shape of the connector 708 is set to be U-shaped, which can facilitate the fixed connection work of the PLC controller 705 .

[0040] In this embodiment, the rotating rod 710 extends to the outer side of the inverter body 1 and is connected to the inverter body 1 through a bearing. The rotating plate 712 is located on the outer side of the filter 701. One side of the bristles 715 is in contact with the outer side of the inverter body 1. Multiple filter screens 701 are all uncovered, which can facilitate the support and rotation of the rotating rod 710 and the ventilation inside the filter 701.

[0041] During use, when the device needs to be used, the staff needs to place the inverter body 1 in a suitable position, and then when the inverter body 1 needs to be cooled, the staff needs to turn on the PLC inside the inverter body 1. After the PLC is turned on, it will control the drive assembly 709 to drive forward through the power line 706 and the connector 708. During the driving process, the drive assembly 709 will synchronously drive the rotating rod 710 and the fan blades 711 to rotate. During the rotation process, the fan blades 711 will suck the external air into the inverter body 1. During this process, the external air will continuously pass through the filter. The air will be discharged from the inside of the net 701 through the through groove, so as to ensure the internal temperature of the inverter body 1, that is, to achieve the working effect of heat dissipation. In this process, since the rotating rod 710 and the rotating plate 712 are connected by a one-way bearing, the rotating plate 712 will not be driven to rotate by the rotating rod 710 when the fan blade 711 rotates. Since there is a certain gap between the multiple filter nets 701 of different lengths, the movable plate 714 and the bristles 715 basically do not affect the amount of air entering the filter net 701, thereby ensuring the functionality of air taking away the heat inside the inverter body 1.

[0042] If a large amount of dust adheres to the outer surface of the filter 701 during long-term use, the filter 701 surface will be clogged, which will cause the air intake volume to decrease, and the heat inside the inverter body 1 cannot be discharged and released in time. Therefore, the temperature inside the inverter body 1 will gradually increase. When the temperature inside the inverter body 1 increases to a certain value, the temperature controller 703 will receive a signal. After receiving the signal, the temperature controller 703 will control the PLC controller 705 to work through the power line 1 704. After working, the PLC controller 705 will control the drive assembly 709 through the power line 2 706 to change the driving direction to Reverse slow rotation. Since the driving assembly 709 is the existing technology, that is, a variable frequency motor is arranged inside, it can be achieved that the rotating rod 710 drives the fan blades 711 to rotate in the reverse direction. The rotating rod 710 will synchronously drive the rotating plate 712 to rotate during the rotation. The rotating plate 712 will synchronously drive the short plate 713 and the movable plate 714 to rotate during the rotation. The movable plate 714 will drive the bristles 715 to clean and scrape the outside of the filter 701 during the rotation. At this time, the scraped impurities and dust will be peeled off faster under the breeze generated by the slow rotation of the fan blades 711, thereby ensuring the smoothness of the inside of the filter 701.

[0043] Example 2

[0044] like Figure 8 to Figure 10 As shown, based on the same concept as the above-mentioned embodiment 1, this embodiment also proposes that two movable plates 714 and bristles 715 are distributed in a circular shape, and an auxiliary mechanism 8 is provided on the outside of the rotating rod 710. The auxiliary mechanism 8 includes a long rod 801, and the long rod 801 is fixedly connected to one side of the outside of the inverter body 1, which can facilitate the fixation of the long rod 801.

[0045] In this embodiment, a clamping plate 802 is fixedly connected to the outside of the long rod 801 , and the cross section of the clamping plate 802 is set to be L-shaped. A circular plate 803 is fixedly installed at one end of the long rod 801 to facilitate the installation of the circular plate 803 .

[0046] In this embodiment, a connecting rod 804 is fixedly connected to one side of the clamping plate 802 . The connecting rod 804 is located on the top of one of the bristles 715 and on the side of another bristle 715 , which can facilitate the connection of the connecting rod 804 .

[0047] During use, during the rotation of the bristles 715, in order to prevent too much dust from accumulating on its surface, which would cause the dust to "explode" into the air during the next cleaning, the bristles 715 will continuously pass through the inside of the connecting rod 804 during the rotation, that is, the bristles 715 will continuously move relative to the connecting rod 804, so that the impurities and dust outside the bristles 715 are cleaned and separated, and discharged under the action of the breeze flowing to the outside, thereby ensuring the cleaning effect.

[0048] Example 3

[0049] like Figure 8 , Fig.10 and Fig.11 As shown, based on the same concept as the above-mentioned embodiment 2, this embodiment further proposes that a separation mechanism 9 is provided on the outside of the rotating rod 710, and the separation mechanism 9 includes a positioning plate 901, and the positioning plate 901 is fixedly installed on one side of the outside of the inverter body 1. A card shell 902 is fixedly connected to the bottom of the positioning plate 901, and a discharge port is opened at the bottom of the card shell 902, which can facilitate the discharge of dust from the discharge port.

[0050] In this embodiment, one side of the card shell 902 is fixedly connected to the outer side of the converter body 1, and a transverse groove is provided on the inner side of the card shell 902. The card plate 802 and the connecting rod 804 extend into the inner side of the card shell 902 through the transverse groove, which can facilitate the extension work of the card plate 802 and the connecting rod 804.

[0051] In this embodiment, a strip plate 903 is fixedly connected to one side of the rotating plate 712, an L-shaped rod 904 is fixedly connected to the top side of the strip plate 903, and one end of the L-shaped rod 904 is fixedly connected to one side of one of the movable plates 714, so that the movable plate 714 can drive the L-shaped rod 904 to rotate.

[0052] In this embodiment, the top and bottom of the strip plate 903 are fixedly connected with the inclined plate 905, and the strip plate 903 and the two inclined plates 905 are fixedly connected with the square plate 907 on one side. The inside of the square plate 907 is connected with the rotating rod 906 through a bearing, and the two sides of the outside of the rotating rod 906 are respectively fixedly connected with the roller body 1 908 and the roller body 2 909. The roller body 1 908 and the roller body 2 909 are both in contact with the inside of the casing 902, and the roller body 1 908 and the roller body 2 909 are provided with multiple grooves, through which the dust can be scraped off and discharged.

[0053] When in use, since the direction of dust needs to be suppressed during the cleaning process, that is, it is not allowed to spread over a large range to cause dust accumulation on the surface of the device, the card shell 902 will suppress the dust, which can not only prevent it from spreading to the surface of the device to cause dust accumulation and large heat storage, but also prevent it from existing around the device, resulting in dust adhesion again when it is converted into negative pressure airflow. The movable plate 714 will synchronously drive the L-shaped rod 904 to rotate during the rotation process, and the L-shaped rod 904 will synchronously drive the inclined plate 905, the square plate 907 and the rotating rod during the rotation process. 906 rotates, and the rotating rod 906 will synchronously drive the roller body 1 908 and the roller body 2 909 to rotate during the rotation process. The roller body 1 908 and the roller body 2 909 will continuously roll inside the jam shell 902 through friction during the rotation process. At the same time, the grooves inside the two will scrape off the dust, which can not only remove the dust attached to the inside of the jam shell 902, but also make the dust inside the groove be completely discharged through the discharge port under the action of the slow rotation of the rotating rod 710. Since the roller body 2 909 and the connecting rod 804 are not in the same plane, no collision will occur;

[0054] When the temperature drops, the temperature controller 703 will receive a signal to control the PLC controller 705 to work. The PLC controller 705 will then adjust the drive assembly 709 to a forward drive mode. At this time, since there is no dust in the air outside the device, dust can be prevented from adhering again during the transition of the working state.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A modular energy storage converter, comprising a converter body (1), characterized in that: Two plates (2) are fixedly connected to both sides of the exterior of the converter body (1); a handle (3) is fixedly connected to one side of the exterior of the four plates (2); four through slots are provided on one side of the interior of the converter body (1); four shielding plates (4) are fixedly connected to one side of the exterior of the converter body (1); a plurality of network cable ports (5) are provided on one side of the exterior of the converter body (1); a plurality of wiring ports (6) are installed and connected to one side of the exterior of the converter body (1); and a dredging mechanism (7) is provided on one side of the interior of the converter body (1); The dredging mechanism (7) comprises a plurality of groups of filter screens (701) of different lengths; a mounting plate (702) is mounted and connected to one side wall of the inner cavity of the converter body (1); a temperature controller (703) is fixedly connected to one side of the mounting plate (702); a power-on wire (704) is fixedly connected to the inside of the temperature controller (703); a PLC controller (705) is fixedly connected to the outer end of the power-on wire (704); a plurality of power-on wires (706) are fixedly connected to the bottom of the PLC controller (705); a transmission controller (707) is fixedly connected to the bottom of each of the plurality of power-on wires (706); and a connection wire (707) is fixedly connected to one side of the transmission controller (707). A connector (708), one end of the connector (708) is fixedly connected to a driving assembly (709), the interior of the driving assembly (709) is connected to a rotating rod (710) via a bearing, the exterior of the rotating rod (710) is fixedly connected to four fan blades (711), the exterior of the fan blades (711) is provided with a rotating plate (712), the rotating plate (712) and the fan blades (711) are connected via a one-way bearing, one side of the rotating plate (712) is fixedly mounted with two short plates (713), one side of the two short plates (713) is fixedly connected to a movable plate (714), and one side of the two movable plates (714) is fixedly connected to a plurality of bristles (715).

2. The modular energy storage converter according to claim 1, characterized in that: The four shielding plates (4) are respectively located at the tops of the four through slots, one side of the PLC controller (705) is fixedly connected to a side wall of the inner cavity of the converter body (1), and the shape of the connector (708) is set to be U-shaped.

3. The modular energy storage converter according to claim 1, characterized in that: The rotating rod (710) extends to one side of the outside of the converter body (1) and is connected to the converter body (1) via a bearing; the rotating plate (712) is located on one side of the outside of the filter screen (701); one side of the bristles (715) is in contact with one side of the outside of the converter body (1); and the plurality of filter screens (701) are all in an uncovered state.

4. The modular energy storage converter according to claim 1, characterized in that: The two movable plates (714) and the bristles (715) are arranged in a circular distribution. An auxiliary mechanism (8) is provided outside the rotating rod (710). The auxiliary mechanism (8) comprises a long rod (801). The long rod (801) is fixedly connected to one side of the outside of the converter body (1).

5. The modular energy storage converter according to claim 4, characterized in that: The outside of the long rod (801) is fixedly connected to a clamping plate (802), the cross section of the clamping plate (802) is arranged in an L shape, and a circular plate (803) is fixedly mounted on one end of the long rod (801).

6. The modular energy storage converter according to claim 5, characterized in that: A connecting rod (804) is fixedly connected to one side of the clamping plate (802), and the connecting rod (804) is located at the top of one of the bristles (715) and at one side of the other bristle (715).

7. The modular energy storage converter according to claim 6, characterized in that: A separation mechanism (9) is provided on the outside of the rotating rod (710), and the separation mechanism (9) comprises a positioning plate (901), and the positioning plate (901) is fixedly installed on one side of the outside of the converter body (1), and a housing (902) is fixedly connected to the bottom of the positioning plate (901), and a discharge port is provided at the bottom of the housing (902).

8. The modular energy storage converter according to claim 7, characterized in that: One side of the card shell (902) is fixedly connected to the outer side of the converter body (1), and a transverse groove is provided on the inner side of the card shell (902), and the card plate (802) and the connecting rod (804) both extend into the inner side of the card shell (902) through the transverse groove.

9. The modular energy storage converter according to claim 8, characterized in that: One side of the rotating plate (712) is fixedly connected to a strip plate (903), one side of the top of the strip plate (903) is fixedly connected to an L-shaped rod (904), and one end of the L-shaped rod (904) is fixedly connected to one side of one of the movable plates (714).

10. The modular energy storage converter according to claim 9, characterized in that: The top and bottom of the strip plate (903) are fixedly connected to an inclined plate (905); one side of the strip plate (903) and the two inclined plates (905) is fixedly connected to a square plate (907); the inside of the square plate (907) is connected to a rotating rod (906) via a bearing; the outside of the rotating rod (906) is fixedly connected to a roller body 1 (908) and a roller body 2 (909) on both sides; the roller body 1 (908) and the roller body 2 (909) are both in contact with the inside of the casing (902); and a plurality of grooves are provided inside the roller body 1 (908) and the roller body 2 (909).

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