Grease cleaning device for yaw grease receiving disc of fan

Abstract

The utility model provides a grease cleaning device for a yaw grease receiving disc of a fan, and relates to the technical field of fan maintenance. The grease cleaning device of the fan yaw grease receiving disc comprises a shovel body, a conveying channel and a grease receiving container, the grease receiving container is connected with the shovel body through the conveying channel, and one of the grease receiving container and the conveying channel is used for being connected with a tower of a fan; the shovel body is used for being arranged on the upper surface of a yaw grease receiving disc of the fan, the extension direction of the shovel body is consistent with the circumferential direction of the yaw grease receiving disc, and the shovel body is configured to scrape and shovel the surface of the yaw grease receiving disc when the yaw grease receiving disc rotates so as to shovel grease on the surface of the yaw grease receiving disc; the conveying channel is used for guiding grease shoveled by the shovel body into the grease receiving container; the grease receiving container is used for collecting grease. The grease cleaning device for the yaw grease receiving disc of the fan is used for solving the problems that waste grease on the yaw grease receiving disc is difficult to clean, and the cleaning efficiency is not high.

Description

Technical Field

[0001] The present application relates to the technical field of fan maintenance, and in particular to a grease cleaning device for a yaw grease receiving pan of a fan. Background Art

[0002] The yaw system of the wind turbine includes yaw bearing, yaw drive motor, yaw brake device and control system, etc. When the wind direction changes, the yaw drive motor will drive the outer ring of the yaw bearing (i.e. the yaw gear ring) to rotate relative to the inner ring, thereby driving the nacelle to rotate to ensure that the impeller continues to face the wind.

[0003] As the fan runs for a long time, the yaw bearing will produce a lot of waste grease, which will accumulate on the yaw grease tray set under the yaw gear ring. It needs to be cleaned regularly to prevent the waste grease from overflowing from the yaw grease tray, causing the fan to be dirty, and to avoid excessive accumulation of waste grease, which makes cleaning difficult. The existing method of removing waste grease from the yaw grease tray is to manually remove it using a straight-handled shovel.

[0004] However, the cleaning workload of the yaw grease pan is large, and the working space is narrow, which makes the cleaning difficult and inefficient. Utility Model Content

[0005] The present application provides a grease cleaning device for a yaw grease receiving pan of a fan, which is used to solve the problems of difficult cleaning operation of waste grease on the yaw grease receiving pan and low cleaning efficiency.

[0006] The present application provides a grease cleaning device for a yaw grease receiving pan of a fan, comprising a shovel body, a conveying channel and a grease receiving container, wherein the grease receiving container is connected to the shovel body through the conveying channel, and one of the grease receiving container and the conveying channel is used to be connected to a tower of the fan; the shovel body is used to be arranged on the upper surface of the yaw grease receiving pan of the fan, and the extension direction of the shovel body is consistent with the circumference of the yaw grease receiving pan, and the shovel body is configured to scrape the surface of the yaw grease receiving pan to shovel off the grease on the surface of the yaw grease receiving pan when the yaw grease receiving pan rotates; the conveying channel is used to guide the grease scooped off by the shovel body into the grease receiving container; the grease receiving container is used to collect grease.

[0007] In a possible implementation, the shovel body includes a bottom plate, a side plate and a baffle; the extension direction of the bottom plate is consistent with the circumference of the yaw grease collecting pan, and the two ends of the bottom plate in the extension direction respectively have pointed portions for scraping grease; the side plates are arranged on both sides of the extension direction of the bottom plate; the baffle is connected to the bottom plate, and the baffle is used to separate the area enclosed by the bottom plate and the side plate into two symmetrical confluence areas.

[0008] In a possible implementation, two confluence ports for connecting the confluence area and the conveying channel are provided on the side plate, and the confluence ports correspond to the confluence areas one by one.

[0009] In a possible implementation, at least one limiting member is connected to a surface of the side plate facing away from the bottom plate, and the limiting member is used to limit the shovel body from being separated from the yaw grease receiving pan.

[0010] In a possible implementation manner, the limiting member is hook-shaped, and the hook head portion of the limiting member is used to buckle on the edge of the yaw grease receiving tray.

[0011] In a possible implementation, the top end of the conveying channel is connected to a side of the side plate facing away from the bottom plate, and the connection position between the conveying channel and the side plate corresponds to the positions of the two confluence ports.

[0012] In a possible implementation, the conveying channel is a U-shaped channel or a cylindrical channel, and one end of the conveying channel connected to the side plate is at least covered below and on both sides of the two confluence ports.

[0013] In a possible implementation, the length of the delivery channel is 10 to 20 cm; the width of the delivery channel is 5 to 15 cm.

[0014] In a possible implementation, the grease receiving container is a shell with a hollow interior, an opening is formed at the top of the shell, and the bottom end of the conveying channel is inserted into the shell through the opening.

[0015] In a possible implementation, the length of the shovel body is 5 to 15 cm; the width of the shovel body is 3 to 8 cm.

[0016] The present application provides a grease cleaning device for a yaw grease receiving pan of a fan, comprising a shovel body, a conveying channel and a grease receiving container. The grease receiving container is connected to the shovel body through the conveying channel. The grease receiving container or the conveying channel is fixed on the tower of the fan, so that the shovel body can be kept in contact with the upper surface of the yaw grease receiving pan. No manual operation is required, and only the yaw effect of the fan is utilized. When the yaw grease receiving pan rotates, the yaw grease receiving pan and the shovel body can be rotated relative to each other, so that the shovel body can scrape the surface of the yaw grease receiving pan to scrape off the waste grease, and the waste grease under the scraping is guided to the grease receiving container through the conveying channel for centralized treatment, thereby solving the problems of difficult operation and low cleaning efficiency when cleaning the waste grease from the yaw grease receiving pan. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0018] Figure 1 A diagram showing the installation state of a grease cleaning device for a yaw grease receiving tray of a fan provided in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of the structure of the shovel body in the grease cleaning device of the fan yaw grease receiving tray provided in the application embodiment;

[0020] Figure 3 A schematic diagram of the connection structure between the shovel body and the conveying channel in the grease cleaning device of the fan yaw grease receiving tray provided in an embodiment of the present application;

[0021] Figure 4 A schematic structural diagram of a grease collecting container in a grease cleaning device for a yaw grease collecting pan of a fan provided in an embodiment of the present application.

[0022] Description of reference numerals:

[0023] 100-shovel body;

[0024] 110- bottom plate; 111- tip;

[0025] 120-side panel; 121-exit;

[0026] 130- baffle;

[0027] 140 - confluence area;

[0028] 150-limiting piece;

[0029] 300- Grease container;

[0030] 310-housing; 311-opening;

[0031] 1- Yaw grease plate.

[0032] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0033] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0034] Those skilled in the art should understand that these implementations are only used to explain the technical principles of the present application and are not intended to limit the protection scope of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0035] It should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0036] In addition, in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0037] As can be seen from the background technology, the yaw system of the wind turbine includes a yaw bearing, a yaw drive motor, a yaw brake device and a control system, etc. When a change in wind direction is detected, the yaw drive motor will drive the outer ring of the yaw bearing (i.e., the yaw gear ring) to rotate relative to the inner ring, thereby driving the nacelle to rotate to ensure that the impeller continues to face the wind.

[0038] As the fan runs for a long time, the yaw bearing will produce a lot of waste grease, which will accumulate on the yaw grease tray set under the yaw gear ring. It needs to be cleaned regularly to prevent the waste grease from overflowing from the yaw grease tray, causing the fan to be dirty, and to avoid excessive accumulation of waste grease, which makes cleaning difficult. The existing method of removing waste grease from the yaw grease tray is to manually remove it using a straight-handled shovel.

[0039] However, the cleaning workload of the yaw grease pan is large, and the working space is narrow, which makes the cleaning difficult and inefficient.

[0040] In view of the above-mentioned problems existing in the prior art, the present application provides a grease cleaning device for a yaw grease receiving pan of a fan, comprising a shovel body, a conveying channel and a grease receiving container. The grease receiving container is connected to the shovel body through the conveying channel. The grease receiving container or the conveying channel is fixed on the tower of the fan, so that the shovel body can be kept in contact with the upper surface of the yaw grease receiving pan. No manual operation is required. Only the yaw effect of the fan is utilized. When the yaw grease receiving pan rotates, the yaw grease receiving pan and the shovel body are made to rotate relative to each other, so that the shovel body scrapes the surface of the yaw grease receiving pan to scrape off the waste grease, and the waste grease under the scraping is guided to the grease receiving container through the conveying channel for centralized treatment, thereby solving the problems of difficult operation and low cleaning efficiency when cleaning the waste grease from the yaw grease receiving pan.

[0041] The following specific embodiments are used to describe in detail the technical solution of the present application and how the technical solution of the present application solves the above technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0042] The following will refer to Figure 1-Figure 4 A grease cleaning device for a yaw grease receiving pan of a fan provided in an embodiment of the present application is described in detail.

[0043] Figure 1 This is a diagram showing the installation state of the grease removal device for the fan yaw grease receiving tray provided in the embodiment of the present application. Figure 1 As shown, the present application provides a grease cleaning device for a yaw grease receiving pan of a wind turbine, comprising a shovel body 100, a conveying channel 200 and a grease receiving container 300, the grease receiving container 300 being connected to the shovel body 100 through the conveying channel 200, and one of the grease receiving container 300 and the conveying channel 200 being used to be connected to the tower of the wind turbine; the shovel body 100 is used to be arranged on the upper surface of the yaw grease receiving pan 1 of the wind turbine, the extension direction of the shovel body 100 is consistent with the circumference of the yaw grease receiving pan 1, and the shovel body 100 is configured to scrape the surface of the yaw grease receiving pan 1 when the yaw grease receiving pan 1 rotates, so as to scrape off the grease on the surface of the yaw grease receiving pan 1; the conveying channel 200 is used to guide the grease scraped off by the shovel body 100 into the grease receiving container 300; the grease receiving container 300 is used to collect grease.

[0044] It can be understood that the yaw grease collecting pan 1 is installed below the yaw gear ring, and the yaw grease collecting pan 1 has a recessed portion on one side close to the yaw gear ring, and the recessed portion is used to accommodate waste grease dripping from the yaw bearing. The edge of the yaw grease collecting pan 1 also has a flange extending in the direction of the yaw gear ring, and the flange forms a shield on the outer circle of the recessed portion to prevent waste grease from flowing out of the yaw grease collecting pan 1 and causing the fan to be dirty.

[0045] During installation, overlap the shovel body 100 on the yaw grease receiving plate 1, and make the bottom surface of the shovel body 100 fit with the upper surface of the yaw grease receiving plate 1, and then use a bracket or other tools to fix the grease receiving container 300 and the conveying channel 200 to the tower of the wind turbine, so that the position of the shovel body 100 remains stable.

[0046] When the wind turbine is yawed, the yaw grease collecting plate 1 will rotate together with the yaw large gear ring, while the shovel body 100, the grease collecting container 300 and the conveying channel 200 are fixedly connected to the tower and remain stationary, which will cause relative sliding between the yaw grease collecting plate 1 and the shovel body 100. Since the shovel body 100 is attached to the upper surface of the yaw grease collecting plate 1, the shovel body 100 can shovel off the waste grease on the yaw grease collecting plate 1 when the two move relative to each other, and then transport it to the grease collecting container 300 through the conveying channel 200 for collection for regular cleaning.

[0047] It should be noted that since the circumferential size of the yaw grease receiving tray 1 is relatively large, multiple grease cleaning devices in the present application can be arranged along the circumference of the yaw grease receiving tray 1, so that when the yaw angle of the fan is small, resulting in a small relative displacement between the yaw grease receiving tray 1 and the shovel body 100, grease can be cleaned from multiple positions on the circumference of the yaw grease receiving tray 1 to increase the cleaning area.

[0048] The conveying channel 200 mainly utilizes the gravity of the waste grease to guide the flow, and the conveying channel 200 can be vertically or inclined. During use, the shovel body 100 is located at the top of the conveying channel 200 to shovel the waste grease from the top, and the grease receiving container 300 is located at the bottom of the conveying channel 200 to collect the waste grease from the bottom.

[0049] Exemplarily, the surface of the shovel body 100 in contact with the yaw grease receiving tray 1 is a curved surface that can fit with the recessed portion of the yaw grease receiving tray 1, so that the surface of the yaw grease receiving tray 1 can be fully cleaned without omission.

[0050] Figure 2 A schematic diagram of the structure of the shovel body in the grease cleaning device of the fan yaw grease receiving tray provided in the application embodiment; Figure 3 This is a schematic diagram of the connection structure between the shovel body and the conveying channel in the grease cleaning device of the fan yaw grease receiving tray provided in the embodiment of the present application. Figures 1 to 3 As shown, in the embodiment of the present application, the shovel body 100 includes a bottom plate 110, a side plate 120 and a baffle 130; the extension direction of the bottom plate 110 is consistent with the circumference of the yaw grease receiving tray 1, and the two ends of the extension direction of the bottom plate 110 respectively have pointed portions 111 for scraping grease; the side plates 120 are arranged on both sides of the extension direction of the bottom plate 110; the baffle 130 is connected to the bottom plate 110, and the baffle 130 is used to separate the area enclosed by the bottom plate 110 and the side plate 120 into two symmetrical confluence areas 140.

[0051] In an embodiment of the present application (not shown in the figure), the side plates 120 are distributed on both sides of the extension direction of the bottom plate 110, and the shape formed by the bottom plate 110 and the side plates 120 is approximately U-shaped, which has a guiding effect on the waste grease gathered in the confluence area 140, so that the waste grease can only flow along the extension direction of the bottom plate 110, thereby preventing the waste grease from overflowing radially from the yaw grease receiving plate 1.

[0052] Combination Figure 2 As shown, in another embodiment of the present application, the side panel 120 may be arranged only on the side of the bottom plate 110 away from the yaw grease receiving tray 1, so that the shape formed by the bottom plate 110 and the side panel 120 is approximately L-shaped, and the side panel 120 is blocked at the edge of the yaw grease receiving tray 1, and the height of the side panel 120 is higher than the flange of the yaw grease receiving tray 1 to prevent the waste grease gathered in the confluence area 140 from overflowing the shovel body 100.

[0053] Exemplarily, the bottom plate 110 and the side plate 120 may be integrally formed by bending sheet metal, or may be separate and connected by welding.

[0054] Furthermore, the bottom surface of the bottom plate 110 has an arc surface that fits the top surface of the yaw grease receiving pan 1, and the tips 111 at both ends can completely scoop up the waste grease from the bottom of the waste grease to avoid omission. Both ends of the shovel body 100 have tips 111, which is equivalent to having shovel heads at both ends of the shovel body 100. When the fan yaws left and right, the waste grease can be scraped from different directions to achieve a full cleaning effect.

[0055] When the yaw grease receiving tray 1 rotates, the tip 111 of the shovel body 100 that is away from the rotation direction of the yaw grease receiving tray 1 plays a cleaning role, completely scooping up the waste grease from the bottom of the waste grease, and the scooped waste grease gathers in the confluence area 140 close to the side tip 111.

[0056] It should be noted that the baffle 130 can be connected to the bottom plate 110 and the side plate 120 by welding or bonding, and the baffle 130 is used to block the waste grease gathered in one confluence area 140 from entering another confluence area 140 to prevent the grease from flowing back to the yaw grease receiving pan 1.

[0057] In the embodiment of the present application, two confluence ports 121 for connecting the confluence area 140 and the conveying channel 200 are provided on the side plate 120 , and the confluence ports 121 correspond to the confluence areas 140 one by one.

[0058] It can be understood that the waste grease scooped up by the shovel body 100 can be discharged from the confluence outlet 121 after being gathered in the confluence area 140 .

[0059] Combination Figure 3As shown, at least one limiting member 150 is connected to a side of the side plate 120 facing away from the bottom plate 110 , and the limiting member 150 is used to limit the shovel body 100 from being separated from the yaw grease receiving pan 1 .

[0060] It should be noted that the limiting member 150 can keep the shovel body 100 in contact with the surface of the yaw grease receiving tray 1 to prevent the shovel body 100 from shifting when encountering harder oil lumps or other impurities, thereby improving the effectiveness of removing waste grease.

[0061] Furthermore, the limiting member 150 is hook-shaped, and the hook head of the limiting member 150 is used to be buckled on the edge of the yaw grease receiving tray 1 .

[0062] When in use, the hook is hooked on the flange of the yaw grease receiving tray 1 and there is a gap between the hook and the bottom surface of the flange, which can reduce friction and limit the displacement of the shovel body 100 in the radial and up and down directions of the yaw grease receiving tray 1.

[0063] Combination Figure 3 As shown, the top end of the conveying channel 200 is connected to the side of the side plate 120 away from the bottom plate 110 , and the connection position between the conveying channel 200 and the side plate 120 corresponds to the position of the two confluence ports 121 .

[0064] The conveying channel 200 corresponds to the confluence outlet 121 , so that the waste grease discharged from the confluence outlet 121 can flow into the conveying channel 200 to avoid leakage.

[0065] In the embodiment of the present application, the conveying channel 200 is a U-shaped channel or a cylindrical channel, and one end of the conveying channel 200 connected to the side plate 120 is at least covered below and on both sides of the two confluence ports 121 .

[0066] The length of the conveying channel 200 is 10 to 20 cm; the width of the conveying channel 200 is 5 to 15 cm.

[0067] When the conveying channel 200 is a U-shaped member, the conveying channel 200 is preferably arranged at an angle, and the two vertical plates of the U-shaped member are respectively blocked at the outermost sides of the two confluence ports 121, and the horizontal plate of the U-shaped member is arranged at the bottom end and below of the two confluence ports 121, so that the waste oil and grease discharged from the confluence ports 121 can enter the conveying channel 200.

[0068] When the conveying channel 200 is a cylindrical member, it is preferably a square cylinder, and the cover is arranged on the edge and outside of the openings 311 of the two outlets 121 to ensure that the waste grease discharged from the outlets 121 enters the conveying channel 200 .

[0069] Furthermore, there may be two conveying passages 200 , which correspond one to one with each confluence outlet 121 , so as to prevent the waste grease discharged from the confluence outlet 121 from leaking.

[0070] Figure 4 This is a schematic diagram of the structure of the grease collecting container in the grease cleaning device of the fan yaw grease collecting tray provided in the embodiment of the present application. Figure 1 and Figure 4 As shown, in the embodiment of the present application, the grease receiving container 300 is a shell 310 with a hollow interior, an opening 311 is provided at the top of the shell 310 , and the bottom end of the delivery channel 200 is inserted into the shell 310 through the opening 311 .

[0071] The bottom end of the delivery channel 200 extends to the inside of the housing 310 to prevent the waste grease from leaking.

[0072] The bottom end of the conveying channel 200 can be detachably connected to the housing 310 by means of screw connection or the like, so as to facilitate the disassembly of the grease receiving container 300 for the treatment of waste grease.

[0073] Further, combined with Figure 4 As shown, a top cover may also be provided on the top of the housing 310 , and an opening 311 is provided on the top cover to prevent waste grease inside the housing 310 from splashing out of the housing 310 .

[0074] Specifically, the volume of the grease receiving container 300 is flexibly selected based on actual needs, and this is not limited in the present application.

[0075] In the embodiment of the present application, the length of the shovel body 100 is 5 to 15 cm; the width of the shovel body 100 is 3 to 8 cm.

[0076] Specifically, the length and width of the shovel body 100 can be set in combination with the size of the yaw grease receiving tray 1 .

[0077] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the utility model disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0078] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A grease cleaning device for a fan yaw grease receiving pan, characterized in that: It comprises a shovel body, a conveying channel and a grease receiving container, wherein the grease receiving container is connected to the shovel body through the conveying channel, and one of the grease receiving container and the conveying channel is used to be connected to a tower of a wind turbine; The shovel body is used to be arranged on the upper surface of the yaw grease receiving plate of the fan, the extension direction of the shovel body is consistent with the circumferential direction of the yaw grease receiving plate, and the shovel body is configured to scrape the surface of the yaw grease receiving plate when the yaw grease receiving plate rotates, so as to scrape off the grease on the surface of the yaw grease receiving plate; The conveying channel is used to guide the grease scooped off by the shovel body into the grease receiving container; The grease collecting container is used for collecting grease.

2. The grease cleaning device for the fan yaw grease receiving pan according to claim 1 is characterized in that: The shovel body comprises a bottom plate, a side plate and a baffle; The extension direction of the bottom plate is consistent with the circumferential direction of the yaw grease receiving tray, and both ends of the bottom plate in the extension direction respectively have pointed parts for scraping grease; The side panels are arranged on both sides of the bottom panel in the extension direction; The baffle is connected to the bottom plate, and is used to separate the area enclosed by the bottom plate and the side plate into two symmetrical confluence areas.

3. The grease cleaning device for the fan yaw grease receiving pan according to claim 2 is characterized in that: The side plate is provided with two confluence ports for connecting the confluence area and the conveying channel, and the confluence ports correspond to the confluence areas one by one.

4. The grease cleaning device for the fan yaw grease receiving pan according to claim 3 is characterized in that: At least one limiting member is connected to a side of the side plate facing away from the bottom plate, and the limiting member is used to limit the shovel body from being separated from the yaw grease receiving tray.

5. The grease cleaning device for the fan yaw grease receiving pan according to claim 4 is characterized in that: The limiting member is hook-shaped, and the hook head of the limiting member is used to buckle on the edge of the yaw grease receiving tray.

6. The grease cleaning device for the fan yaw grease receiving pan according to any one of claims 3 to 5, characterized in that: The top end of the conveying channel is connected to a side of the side plate facing away from the bottom plate, and the connection position of the conveying channel and the side plate corresponds to the position of the two confluence ports.

7. The grease cleaning device for the fan yaw grease receiving pan according to claim 6 is characterized in that: The conveying channel is a U-shaped channel or a cylindrical channel, and one end of the conveying channel connected to the side plate is at least covered below and on both sides of the two confluence ports.

8. The grease cleaning device for the fan yaw grease receiving pan according to claim 7 is characterized in that: The length of the conveying channel is 10 to 20 cm; the width of the conveying channel is 5 to 15 cm.

9. The grease cleaning device for the fan yaw grease receiving pan according to claim 8, characterized in that: The grease receiving container is a shell with a hollow interior, an opening is provided on the top of the shell, and the bottom end of the conveying channel is inserted into the shell through the opening.

10. The grease cleaning device for the fan yaw grease receiving pan according to any one of claims 1 to 5, characterized in that: The length of the shovel body is 5 to 15 cm; the width of the shovel body is 3 to 8 cm.

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