Camera fixing device
By designing a combined structure of mounting and adjustment sections, the problem of the inability to adjust the positions of the camera and the robotic arm was solved, enabling the image acquisition unit to be adjusted in multiple directions, increasing the shooting range, and improving the camera's flexibility and applicability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA TOBACCO SICHUAN IND CO LTD
- Filing Date
- 2025-08-12
- Publication Date
- 2026-05-29
AI Technical Summary
In the existing technology, when the camera is mounted on the robotic arm via an L-shaped steel plate, the relative position of the camera and the robotic arm cannot be adjusted as needed, which affects the camera's performance.
Design a camera mounting device, including a mounting part and an adjustment part, which allows the image acquisition device to be adjusted in multiple directions by a combination of mounting holes and adjustment holes, thereby increasing the shooting range.
Without moving the external equipment, staff can adjust the position of the image acquisition device according to shooting needs, increasing the shooting area and improving the camera's flexibility and applicability.
Smart Images
Figure CN224301734U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of camera mounting technology, and in particular to a camera fixing device. Background Technology
[0002] In the tobacco processing and manufacturing process, a robotic arm is typically used to grab empty boxes and place them in a preset position. Once the tobacco sticks are formed, they are then placed into the empty box at the preset position. Before grabbing the empty box, the robotic arm needs to use a camera to scan and identify the barcode on the empty box.
[0003] In related technologies, the camera is mounted on a robotic arm via an L-shaped steel plate. The L-shaped steel plate has multiple bolt holes. During installation, the operator first passes the camera's mounting hardware through these bolt holes to connect the camera to the L-shaped steel plate. Then, mounting bolts are passed through the remaining bolt holes on the L-shaped steel plate. Finally, the mounting bolts are connected to the robotic arm, assembling the L-shaped steel plate with the camera mounted on it onto the robotic arm. The relative position of the camera on the L-shaped steel plate and the robotic arm cannot be adjusted as needed, affecting the camera's usability. Utility Model Content
[0004] Therefore, it is necessary to propose a camera fixing device to address the problem that the relative position of the camera on the L-shaped steel plate and the robotic arm cannot be adjusted as needed.
[0005] A camera mounting device, comprising:
[0006] The mounting part is used for mounting with external equipment; the mounting part is provided with a mounting hole group; the mounting hole group includes at least one first oblong hole, the first oblong hole extends along a first direction and penetrates the mounting part along the thickness direction of the mounting part;
[0007] An adjustment section is located on one side of the mounting section along its own thickness direction and on one side of the mounting hole group along the second direction; the adjustment section is used to mount an image acquisition device; the adjustment section is provided with an adjustment hole group; the adjustment hole group includes at least one second oblong hole, the second oblong hole extends along the thickness direction of the mounting section and penetrates the adjustment section along the second direction;
[0008] The thickness direction of the mounting part, the first direction, and the second direction intersect each other.
[0009] In one embodiment, the adjustment hole group includes a plurality of second waist-shaped holes; the plurality of second waist-shaped holes are arranged along the first direction.
[0010] In one embodiment, the ratio of the dimension of the second waist-shaped hole along the thickness direction of the mounting portion to the dimension of the adjusting portion along the thickness direction of the mounting portion is between 0.5 and 0.9.
[0011] In one embodiment, the dimension of the second oblong hole along the thickness direction of the mounting portion is between 50 mm and 75 mm.
[0012] In one embodiment, the ratio of the size of the second waist-shaped hole along the first direction to the size of the adjusting part along the first direction is greater than 0 and less than or equal to 1 / (M+1);
[0013] Wherein, M is the number of the second waist-shaped holes.
[0014] In one embodiment, the ratio of the dimension of the first waist-shaped hole along the first direction to the dimension of the mounting portion along the first direction is between 0.5 and 0.99.
[0015] In one embodiment, the mounting hole group includes two first waist-shaped holes; the two first waist-shaped holes are arranged along the second direction.
[0016] In one embodiment, the mounting hole group includes at least one third oblong hole; the third oblong hole extends along the second direction; the third oblong hole penetrates the mounting portion along the thickness direction of the mounting portion;
[0017] The third waist-shaped hole includes a first waist-shaped sub-hole and a second waist-shaped sub-hole; the first waist-shaped sub-hole and the second waist-shaped sub-hole are arranged along the second direction;
[0018] Of the two first waist-shaped holes, one first waist-shaped hole is connected to the first waist-shaped sub-hole, and the other first waist-shaped hole is connected to the second waist-shaped sub-hole.
[0019] In one embodiment, the first waist-shaped sub-hole and the second waist-shaped sub-hole are respectively located between the two sides of the corresponding first waist-shaped hole along the first direction.
[0020] In one embodiment, the mounting hole group includes a plurality of the third oblong holes; the plurality of third oblong holes are arranged along the first direction;
[0021] Of the two first waist-shaped holes, one first waist-shaped hole communicates with a plurality of first waist-shaped sub-holes arranged along the first direction; the other first waist-shaped hole communicates with a plurality of second waist-shaped sub-holes arranged along the first direction.
[0022] In this embodiment, when the mounting part is assembled with the external device, the screw of the mounting bolt passes through the first oblong hole on the mounting part and is then fastened to the external device; the nut of the mounting bolt presses the mounting part onto the external device, preventing the mounting part from detaching from the external device. When the mounting part is fixed to the external device, the screw of the fastening bolt passes through the second oblong hole on the adjusting part and is then fastened to the image acquisition unit; the nut of the fastening bolt presses the adjusting part and the image acquisition unit together. The adjusting part is located on one side of the mounting part along its own thickness direction, and the relative positional relationship between the adjusting part and the mounting part is fixed. The image acquisition unit on the adjusting part can be connected to the external device through the mounting part.
[0023] The first oblong hole extends along the first direction, and the second oblong hole extends along the thickness direction of the mounting part. When adjusting the imaging range of the image acquisition unit in the first direction, the mounting bolt can be moved within the first oblong hole along the first direction, changing the position of the mounting bolt within the first oblong hole; this, in turn, changes the position of the mounting part and the external device in the first direction, causing the mounting part to move relative to the external device along the first direction. Simultaneously, the adjustment part moves synchronously under the drive of the mounting part, and drives the image acquisition unit to move relative to the external device along the first direction, so that the image acquisition unit can capture images of the target objects within the area, increasing the imaging range of the image acquisition unit in the first direction.
[0024] When adjusting the imaging range of the image acquisition device in the thickness direction of the mounting part, the fastening bolt can be moved within the second oblong hole along the thickness direction of the mounting part to change the position of the fastening bolt within the second oblong hole; thereby causing the image acquisition device to move relative to the adjustment part along the thickness direction of the mounting part, increasing the imaging range of the image acquisition device in the thickness direction of the mounting part.
[0025] In summary, when the camera fixing device in this embodiment is used to connect the image acquisition device to the external device, the operator can adjust the position of the image acquisition device according to the shooting needs without moving the external device, thereby changing the shooting area of the image acquisition device. Attached Figure Description
[0026] To more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of this application, the drawings used in the description of the embodiments or exemplary embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0027] Figure 1 This is a schematic diagram of the camera fixing device in one embodiment of this application.
[0028] Figure label:
[0029] Camera mounting device 100;
[0030] Installation Department 110;
[0031] Mounting hole group 120, first waist-shaped hole 121, third waist-shaped hole 122, first waist-shaped sub-hole 122-1, second waist-shaped sub-hole 122-2;
[0032] Adjustment unit 130;
[0033] Adjustment hole group 140, second oblong hole 141. Detailed Implementation
[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0035] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0036] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0038] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0039] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.
[0040] Please see Figure 1 , Figure 1A schematic diagram of a camera mounting device according to an embodiment of this application is shown. An embodiment of this application provides a camera mounting device 100, including a mounting portion 110 and an adjustment portion 130. The mounting portion 110 is used for mounting an external device (not shown); the mounting portion 110 is provided with a mounting hole group 120; the mounting hole group 120 includes at least one first oblong hole 121, which extends along a first direction and penetrates the mounting portion 110 along its thickness direction. The adjustment portion 130 is located on one side of the mounting portion 110 along its own thickness direction and on one side of the mounting hole group 120 along a second direction; the adjustment portion 130 is used for mounting an image acquisition device (not shown); the adjustment portion 130 is provided with an adjustment hole group 140; the adjustment hole group 140 includes at least one second oblong hole 141, which extends along the thickness direction of the mounting portion 110 and penetrates the adjustment portion 130 along the second direction. The thickness direction, the first direction, and the second direction of the mounting portion 110 intersect each other.
[0041] In this embodiment, when the mounting part 110 is assembled with an external device, the screw of the mounting bolt (not shown) passes through the first oblong hole 121 on the mounting part 110 and is then fastened to the external device; the nut of the mounting bolt presses the mounting part 110 onto the external device, preventing the mounting part 110 from detaching from the external device. When the mounting part 110 is fixed to the external device, the screw of the fastening bolt (not shown) passes through the second oblong hole 141 on the adjusting part 130 and is then fastened to the image acquisition unit; the nut of the fastening bolt presses the adjusting part 130 and the image acquisition unit together. The adjusting part 130 is located on one side of the mounting part 110 along its own thickness direction, and the relative positional relationship between the adjusting part 130 and the mounting part 110 is fixed. The image acquisition unit on the adjusting part 130 can be connected to the external device through the mounting part 110.
[0042] The first oblong hole 121 extends along the first direction, and the second oblong hole 141 extends along the thickness direction of the mounting portion 110. When adjusting the shooting range of the image acquisition unit in the first direction, the mounting bolt can be moved within the first oblong hole 121 along the first direction, changing the position of the mounting bolt within the first oblong hole 121; thereby changing the position of the mounting portion 110 and the external device in the first direction, so that the mounting portion 110 moves relative to the external device in the first direction. At the same time, the adjustment portion 130 moves synchronously under the drive of the mounting portion 110, and drives the image acquisition unit to move relative to the external device in the first direction, so that the image acquisition unit can capture images of the target objects in the area, increasing the shooting range of the image acquisition unit in the first direction.
[0043] When it is necessary to adjust the shooting range of the image acquisition device in the thickness direction of the mounting part 110, the fastening bolt can be moved in the second oblong hole 141 along the thickness direction of the mounting part 110 to change the position of the fastening bolt in the second oblong hole 141; thereby causing the image acquisition device to move relative to the adjustment part 130 along the thickness direction of the mounting part 110, increasing the shooting range of the image acquisition device in the thickness direction of the mounting part 110.
[0044] In summary, when the camera fixing device 100 in this embodiment is used to connect the image acquisition device to an external device, the operator can adjust the position of the image acquisition device according to the shooting needs without moving the external device, thereby changing the shooting area of the image acquisition device.
[0045] It should be noted that the external device can be a robotic arm or a robot.
[0046] Please see Figure 1 In some embodiments, the adjustment hole group 140 includes a plurality of second waist-shaped holes 141; the plurality of second waist-shaped holes 141 are arranged along a first direction.
[0047] In this embodiment, a plurality of second waist-shaped holes 141 are arranged along the first direction, so that the operator can insert a fastening bolt in each second waist-shaped hole 141 and connect the image acquisition device and the adjustment part 130 through the multiple fastening bolts, thereby enhancing the firmness of the connection between the image acquisition device and the adjustment part 130.
[0048] Please see Figure 1 In some embodiments, the ratio of the dimension D1 of the second waist-shaped hole 141 along the thickness direction of the mounting portion 110 to the dimension D2 of the adjusting portion 130 along the thickness direction of the mounting portion 110 is between 0.5 and 0.9.
[0049] In this embodiment, the ratio of the dimension D1 of the second oblong hole 141 along the thickness direction of the mounting portion 110 to the dimension D2 of the adjusting portion 130 along the thickness direction of the mounting portion 110 is between 0.5 and 0.9. Thus, the fastening bolt can move a greater distance within the second oblong hole 141 along the thickness direction of the mounting portion 110; the image acquisition device can move a greater distance relative to the adjusting portion 130 along the thickness direction of the mounting portion 110 under the drive of the fastening bolt; further increasing the imaging range of the image acquisition device in the thickness direction of the mounting portion 110.
[0050] Please see Figure 1 In some embodiments, the dimension D1 of the second oblong hole 141 along the thickness direction of the mounting portion 110 is between 50 mm and 75 mm.
[0051] In this embodiment, the dimension D1 of the second oblong hole 141 along the thickness direction of the mounting portion 110 is between 50mm and 75mm; thus, the fastening bolt can move 50mm to 75mm within the second oblong hole 141 along the thickness direction of the mounting portion 110; the image acquisition device can move 50mm to 75mm relative to the adjustment portion 130 along the thickness direction of the mounting portion 110 under the drive of the fastening bolt.
[0052] It should be noted that the dimension D1 of the second oblong hole 141 along the thickness direction of the mounting portion 110 is 50mm; the dimension D2 of the adjusting portion 130 along the thickness direction of the mounting portion 110 is 80mm.
[0053] Please see Figure 1 In some embodiments, the ratio of the dimension D3 of the second waist-shaped hole 141 along the first direction to the dimension D4 of the adjustment part 130 along the first direction is greater than 0 and less than or equal to 1 / (M+1); where M is the number of the second waist-shaped holes 141.
[0054] In this embodiment, the dimension D3 of the second waist-shaped hole 141 along the first direction can be 5mm, and the dimension D4 of the adjusting part 130 along the first direction can be 100mm.
[0055] It should be noted that the camera mounting device 100 can be made of 304 stainless steel and its hardness can reach 38HRC~45HRC after heat treatment.
[0056] Please see Figure 1 In some embodiments, the ratio of the dimension D5 of the first waist-shaped hole 121 along the first direction to the dimension D6 of the mounting portion 110 along the first direction is between 0.5 and 0.99.
[0057] In this embodiment, the ratio of the dimension D5 of the first oblong hole 121 along the first direction to the dimension D6 of the mounting portion 110 along the first direction is between 0.5 and 0.99. Thus, the mounting bolt can move a greater distance within the first oblong hole 121 along the first direction, and the mounting bolt can drive the mounting portion 110 to move a greater distance relative to the external device along the first direction. The mounting portion 110 can drive the image acquisition unit on the adjustment portion 130 to move a greater distance along the first direction, further increasing the image acquisition unit's shooting range in the first direction.
[0058] It should be noted that the dimension D6 of the mounting part 110 along the first direction can be 100mm, and the dimension D5 of the first oblong hole 121 along the first direction can be 84mm. The thickness of the mounting part 110 can be 5mm.
[0059] Please see Figure 1In some embodiments, the mounting hole group 120 includes two first oblong holes 121; the two first oblong holes 121 are arranged along a second direction.
[0060] In this embodiment, the two first waist-shaped holes 121 are arranged along the second direction, so that the operator can insert a mounting bolt in each first waist-shaped hole 121 and connect the mounting part 110 to the external equipment through multiple mounting bolts, thereby enhancing the firmness of the connection between the mounting part 110 and the external equipment.
[0061] It should be noted that the distance between the two first waist-shaped holes 121 along the second direction can be 30mm.
[0062] In some embodiments, one side of the adjusting portion 130 along the second direction is flush with one side of the mounting portion 110 along the second direction, the dimension of the adjusting portion 130 along the second direction is D7, the dimension of the mounting portion 110 along the second direction is D8, and the ratio of D8 to D7 is greater than or equal to 16.
[0063] It should be noted that the dimension of the adjusting part 130 along the second direction can be 5mm, and the dimension of the mounting part 110 along the second direction can be 120mm.
[0064] In some embodiments, the dimension of the first waist-shaped hole 121 along the second direction is D9, and the ratio of D9 to D8 is greater than 0 and less than or equal to 1 / 3.
[0065] It should be noted that the dimension D9 of the first oblong hole 121 along the second direction can be 6.5mm.
[0066] Please see Figure 1 In some embodiments, the mounting hole assembly 120 includes at least one third oblong hole 122; the third oblong hole 122 extends along a second direction; the third oblong hole 122 penetrates the mounting portion 110 along its thickness direction. The third oblong hole 122 includes a first oblong sub-hole 122-1 and a second oblong sub-hole 122-2; the first oblong sub-hole 122-1 and the second oblong sub-hole 122-2 are arranged along the second direction. Of the two first oblong holes 121, one first oblong hole 121 communicates with the first oblong sub-hole 122-1, and the other first oblong hole 121 communicates with the second oblong hole 122-2.
[0067] In this embodiment, when the shooting range of the image acquisition unit in the second direction needs to be changed, the mounting bolts in the two first oblong holes 121 can be moved into the corresponding first oblong sub-holes 122-1 and second oblong sub-holes 122-2, respectively; then, the mounting part 110 moves relative to the external device in the second direction by moving along the second direction within the corresponding first oblong sub-holes 122-1 and second oblong sub-holes 122-2. By moving the mounting part 110 relative to the external device in the second direction, the image acquisition unit on the adjustment part 130 can be driven to move synchronously, ultimately increasing the shooting range of the image acquisition unit in the second direction.
[0068] It should be noted that the distance between the first waist-shaped sub-hole 122-1 and the second waist-shaped sub-hole 122-2 in the second direction is D10, and D10 can be 8mm.
[0069] Please see Figure 1 In some embodiments, the first waist-shaped sub-hole 122-1 and the second waist-shaped sub-hole 122-2 are respectively located between the two sides of the corresponding first waist-shaped hole 121 along the first direction.
[0070] In this embodiment, the first waist-shaped sub-hole 122-1 and the second waist-shaped sub-hole 122-2 have a dimension of D11 along the second direction, and the ratio of D11 to D8 is less than 1 / 3. It should be noted that D11 can be 31mm.
[0071] In some embodiments, the dimensions of the first oblong sub-hole 122-1 and the second oblong sub-hole 122-2 along the first direction are D12, and the ratio of D12 to D6 is less than 1 / 10. It should be noted that D12 can be 6.5mm.
[0072] Please see Figure 1 In some embodiments, the mounting hole group 120 includes a plurality of third oblong holes 122; the plurality of third oblong holes 122 are arranged along a first direction. Of the two first oblong holes 121, one first oblong hole 121 communicates with a plurality of first oblong sub-holes 122-1 arranged along the first direction; the other first oblong hole 121 communicates with a plurality of second oblong sub-holes 122-2 arranged along the first direction.
[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0074] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A camera fixing device, characterized in that, The camera fixing device includes: The mounting part is used for mounting with external equipment; the mounting part is provided with a mounting hole group; the mounting hole group includes at least one first oblong hole, the first oblong hole extends along a first direction and penetrates the mounting part along the thickness direction of the mounting part; An adjustment section is located on one side of the mounting section along its own thickness direction and on one side of the mounting hole group along the second direction; the adjustment section is used to mount an image acquisition device; the adjustment section is provided with an adjustment hole group; the adjustment hole group includes at least one second oblong hole, the second oblong hole extends along the thickness direction of the mounting section and penetrates the adjustment section along the second direction; The thickness direction of the mounting part, the first direction, and the second direction intersect each other.
2. The camera fixing device according to claim 1, characterized in that, The adjustment hole group includes a plurality of second waist-shaped holes; the plurality of second waist-shaped holes are arranged along the first direction.
3. The camera fixing device according to claim 1 or 2, characterized in that, The ratio of the dimension of the second waist-shaped hole along the thickness direction of the mounting portion to the dimension of the adjusting portion along the thickness direction of the mounting portion is between 0.5 and 0.
9.
4. The camera fixing device according to claim 3, characterized in that, The second oblong hole has a dimension between 50mm and 75mm along the thickness direction of the mounting portion.
5. The camera fixing device according to claim 3, characterized in that, The ratio of the dimension of the second waist-shaped hole along the first direction to the dimension of the adjusting part along the first direction is greater than 0 and less than or equal to 1 / (M+1); Wherein, M is the number of the second waist-shaped holes.
6. The camera fixing device according to claim 1, characterized in that, The ratio of the dimension of the first waist-shaped hole along the first direction to the dimension of the mounting portion along the first direction is between 0.5 and 0.
99.
7. The camera fixing device according to claim 1, characterized in that, The mounting hole group includes two first waist-shaped holes; the two first waist-shaped holes are arranged along the second direction.
8. The camera fixing device according to claim 7, characterized in that, The mounting hole group includes at least one third oblong hole; the third oblong hole extends along the second direction; the third oblong hole penetrates the mounting portion along the thickness direction of the mounting portion; The third waist-shaped hole includes a first waist-shaped sub-hole and a second waist-shaped sub-hole; the first waist-shaped sub-hole and the second waist-shaped sub-hole are arranged along the second direction; Of the two first waist-shaped holes, one first waist-shaped hole is connected to the first waist-shaped sub-hole, and the other first waist-shaped hole is connected to the second waist-shaped sub-hole.
9. The camera fixing device according to claim 8, characterized in that, The first waist-shaped sub-hole and the second waist-shaped sub-hole are respectively located between the two sides of the corresponding first waist-shaped sub-hole along the first direction.
10. The camera fixing device according to claim 8, characterized in that, The mounting hole group includes a plurality of the third oblong holes; the plurality of third oblong holes are arranged along the first direction; Of the two first waist-shaped holes, one first waist-shaped hole communicates with a plurality of first waist-shaped sub-holes arranged along the first direction; the other first waist-shaped hole communicates with a plurality of second waist-shaped sub-holes arranged along the first direction.