Tray and workpiece loading system

Abstract

The utility model belongs to material storage and conveying technical field discloses a tray and workpiece feeding system, the bottom of tray is provided with first recess, first recess is shaped with the boss that sets on processing machine platform, thereby only need to make tray through first recess sleeve set in the outer periphery of boss, can position tray, moreover, because the outer periphery of the fence platform is shaped with support plate, when tray sleeve set in the outer periphery of boss, support plate can be supported on processing machine platform, thereby play the role of supporting tray. By the above, the tray in the utility model can be positioned and stably loaded on the processing machine platform, thereby ensuring that the subsequent mechanical hand can accurately and quickly pick up the workpiece, that is, in the utility model, the mechanical hand can directly pick up the workpiece from the tray without manual transfer of the workpiece, thereby eliminating the problem of damage to the workpiece during transfer, and also saving the time consumed in transferring the workpiece, thereby improving the production efficiency of the product.

Description

Technical Field

[0001] This utility model relates to the field of material storage and conveying technology, and in particular to a pallet and workpiece loading system. Background Technology

[0002] In the production process of electronic product components such as mobile phone screen modules, smaller electronic components need to be laser-welded onto the middle plate. In order to facilitate the bulk transportation of electronic components, the existing technology generally uses trays as carriers to store electronic components.

[0003] As mentioned above, traditional pallets are difficult to place stably on the processing machine table, and the position of the pallet placed on the processing machine table is uncertain. Therefore, in order to ensure that the robot can accurately and quickly pick up the workpiece, after the pallet is transported to the processing machine table, the operator needs to manually take the workpiece out of the pallet and place it in the preset position so that the robot can pick up the material later.

[0004] However, workers are prone to damaging workpieces during transfer, and the transfer process takes a long time, resulting in low production efficiency. Utility Model Content

[0005] The purpose of this utility model is to provide a pallet and workpiece loading system to solve the problems that workers are prone to damaging workpieces when transferring them, and that transferring workpieces takes a long time, resulting in low production efficiency.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a tray, comprising:

[0008] A carrier plate and a baffle platform, the baffle platform surrounding the outer perimeter of the carrier plate, and the back of the carrier plate and the baffle platform together forming a first groove, the first groove being contoured to a boss set on a processing machine platform, and the front of the carrier plate being provided with a plurality of receiving grooves, the receiving grooves being configured to accommodate workpieces;

[0009] A support plate is formed on the outer periphery of the enclosure platform and surrounds the outer periphery of the groove of the first recess.

[0010] Preferably, the enclosure platform includes a first plate portion and a second plate portion. The first plate portion surrounds the outer periphery of the carrier plate, and the second plate portion connects the first plate portion and the support plate. The upper surface of the first plate portion is higher than the front surface of the carrier plate, so that the front surface of the carrier plate and the first plate portion together form a second groove.

[0011] Preferably, the carrier plate has several protruding ribs protruding into the first groove, and the receiving groove is formed inside the protruding ribs.

[0012] Preferably, the second plate portion protrudes into the first groove to form a positioning rib, and the positioning ribs are provided around the perimeter of the carrier plate. In the two stacked trays, the positioning rib of the upper tray abuts against the first plate portion of the lower tray.

[0013] Preferably, the second plate portion has a guide rib protruding towards the inside of the first groove, the guide rib bends towards the inside of the first groove, and forms a first guide groove on the outer wall of the second plate portion, the two ends of the first guide groove extending to the upper surface of the first plate portion and the support plate, respectively.

[0014] Preferably, the front side of the carrier plate is provided with a plurality of alignment grooves, each of which corresponds one-to-one with a plurality of receiving grooves. The receiving grooves are located at the bottom of the alignment grooves, and the opening size of the receiving grooves is smaller than the bottom size of the alignment grooves.

[0015] Preferably, the front side of the carrier plate is provided with a plurality of pick-up and place slots, and the plurality of pick-up and place slots correspond one-to-one with the plurality of receiving slots. The pick-up and place slots include a first slot portion and a second slot portion. The first slot portion and the second slot portion are respectively located on both sides of the receiving slot along the horizontal direction, and the first slot portion and the second slot portion both penetrate the slot wall of the receiving slot and communicate with the receiving slot.

[0016] Preferably, the carrier plate protrudes into the first groove to form a support column, the support column is hollow, and the bottom surface of the support column is flush with the bottom surface of the support plate.

[0017] In another aspect, this utility model also provides a workpiece feeding system, including a processing machine table and a tray as described above. The processing machine table is used to hold the tray, and the processing machine table is provided with a boss. The tray is sleeved on the outer periphery of the boss through the first groove.

[0018] Preferably, the enclosure platform has a positioning rib protruding into the first groove, and the positioning rib is provided on all four sides of the carrier plate.

[0019] The boss is provided with a number of positioning slots, and the number of positioning ribs can be accommodated in the number of positioning slots.

[0020] The beneficial effects of this utility model are:

[0021] In this invention, the bottom of the pallet is provided with a first groove, which is contoured to a boss on the processing machine table. Therefore, the pallet can be positioned simply by fitting it through the first groove onto the outer periphery of the boss. Furthermore, since the outer periphery of the platform is formed with a support plate, the support plate supports the pallet on the processing machine table when it is fitted onto the boss, thus providing support. As a result, the pallet in this invention can be positioned and stably placed on the processing machine table, ensuring that the robot arm can accurately and quickly pick up the workpiece. In other words, in this invention, the robot arm can directly pick up the workpiece from the pallet without manual transfer, eliminating the problem of workpiece damage during transfer and saving time spent on transfer, thereby improving production efficiency.

[0022] In this invention, the workpiece feeding system has a processing table with a boss. The pallet is fitted onto the outer periphery of the boss through a first groove. Thus, the processing table can position the pallet, and the pallet's support plate can support it on the processing table. This allows the pallet to be positioned and stably placed on the processing table. Subsequently, the robot can directly, accurately, and quickly remove the workpiece from the pallet, eliminating the need for manual transfer of the workpiece. This eliminates the problem of workpiece damage during transfer and saves the time spent on transferring workpieces, thereby improving product production efficiency. Attached Figure Description

[0023] Figure 1 This is one of the structural schematic diagrams of the tray in the embodiments of this utility model;

[0024] Figure 2 This is the second schematic diagram of the tray structure in this utility model embodiment;

[0025] Figure 3 This is a schematic diagram of the structure of two stacked trays in an embodiment of this utility model;

[0026] Figure 4 This is a top view of two stacked trays in an embodiment of this utility model;

[0027] Figure 5 yes Figure 4 A magnified view of a section at point A in the middle;

[0028] Figure 6 It is along Figure 4 Sectional view of the middle BB line;

[0029] Figure 7 It is along Figure 4 A cross-sectional view of the CC line;

[0030] Figure 8 This is a schematic diagram of the processing machine table in an embodiment of this utility model.

[0031] In the picture:

[0032] 11. Carrier plate; 111. Receiving groove; 112. Protruding rib; 113. Alignment groove; 114. Pick-up and drop groove; 1141. First groove; 1142. Second groove; 115. Support column; 12. Enclosure platform; 121. First plate; 1211. First plate; 1212. Second plate; 122. Second plate; 1221. Positioning rib; 1222. Guide rib; 1223. First guide groove; 13. First groove; 14. Support plate; 15. Second groove;

[0033] 2. Machining table; 21. Boss; 211. Positioning groove; 212. Clearance groove; 213. Second guide groove. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0035] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] This embodiment provides a workpiece loading system, which includes a processing machine and a pallet. The pallet is used to hold workpieces and can be transferred to the processing machine, which is used to hold the pallet.

[0039] Please see Figures 1 to 8 In this embodiment, the pallet includes a carrier plate 11, a retaining platform 12, and a support plate 14. The retaining platform 12 surrounds the outer periphery of the carrier plate 11, and the back of the carrier plate 11 and the retaining platform 12 together form a first groove 13. The first groove 13 is contoured to the boss 21 provided on the processing machine table 2. The front of the carrier plate 11 is provided with a plurality of receiving slots 111, which are configured to accommodate workpieces, thereby enabling the placement of a plurality of workpieces on the pallet. The support plate 14 is formed on the outer periphery of the retaining platform 12 and surrounds the outer periphery of the opening of the first groove 13.

[0040] For example, in this embodiment, the carrier plate 11 is provided with two placement areas, and each placement area is provided with four rows of receiving slots 111, each row including eight receiving slots 111, so that a single tray can hold 64 workpieces.

[0041] In this embodiment, a first groove 13 is provided at the bottom of the pallet, which is contoured to a protrusion 21 on the processing table 2. Therefore, the pallet can be positioned simply by fitting it onto the outer periphery of the protrusion 21 through the first groove 13. Furthermore, since a support plate 14 is formed on the outer periphery of the enclosure table 12, the support plate 14 supports the pallet on the processing table 2 when it is fitted onto the protrusion 21, thus providing support for the pallet. As a result, the pallet in this embodiment can be positioned and stably placed on the processing table 2, ensuring that the robot can accurately and quickly pick up the workpiece. That is, in this embodiment, the robot can directly pick up the workpiece from the pallet without manual transfer, thus eliminating the problem of workpiece damage during transfer and saving time spent on transfer, thereby improving production efficiency.

[0042] Based on the above, in this embodiment, the processing table 2 of the workpiece loading system is provided with a boss 21. The pallet is fitted onto the outer periphery of the boss 21 through the first groove 13. Thus, the processing table 2 can position the pallet, and the pallet support plate 14 can support it on the processing table 2, so that the pallet can be positioned and stably placed on the processing table 2. Subsequently, the robot can directly, accurately and quickly pick up the workpiece from the pallet, eliminating the need for manual transfer of workpieces. This can eliminate the problem of workpieces being damaged during transfer, and also save the time spent on transferring workpieces, thereby improving the production efficiency of the product.

[0043] It is worth noting that the enclosure platform 12 includes a first plate portion 121 and a second plate portion 122. The first plate portion 121 surrounds the outer periphery of the carrier plate 11, and the second plate portion 122 connects the first plate portion 121 and the support plate 14. The upper surface of the first plate portion 121 is higher than the front surface of the carrier plate 11, so that the front surface of the carrier plate 11 and the first plate portion 121 together form a second groove 15. That is, in this embodiment, the carrier plate 11 is sunk below the enclosure platform 12, and the enclosure platform 12 can prevent the workpiece from falling off the pallet, thereby effectively protecting the workpiece placed in the receiving groove 111.

[0044] Specifically, in this embodiment, the first plate portion 121 includes a first plate member 1211 and a second plate member 1212. The first plate member 1211 surrounds the outer periphery of the carrier plate 11, and the front side of the carrier plate 11 and the first plate member 1211 form a second groove 15. The front side of the carrier plate 11 is the bottom of the second groove 15, and the inner wall of the first plate member 1211 is the side wall of the second groove 15. The second plate member 1212 surrounds the outer periphery of the first plate member 1211 and is connected between the second plate portion 122 and the first plate member 1211. The upper surface of the second plate member 1212 is described as the first surface, and the front side of the carrier plate 11 is described as the second surface. The first surface is higher than the second surface.

[0045] Moreover, in this embodiment, the second plate portion 122 is inclined. Specifically, from the side near the first plate portion 121 to the side near the support plate 14, the second plate portion 122 is inclined to the side away from the carrier plate 11, and the inclination angle is 10°, thereby facilitating pallet demolding during pallet manufacturing.

[0046] As can be understood from the above, the boss 21 is provided with a relief groove 212. When the pallet is fitted on the outer periphery of the boss 21, the carrier plate 11 sinks into the relief groove 212. That is, the boss 21 avoids the carrier plate 11 through the relief groove 212, so that the pallet can be fitted on the outer periphery of the boss 21.

[0047] Moreover, in this embodiment, the carrier plate 11 is provided with a plurality of protruding ribs 112 protruding into the first groove 13, and the protruding ribs 112 are provided with receiving grooves 111. Therefore, the thickness of the carrier plate 11 does not need to be set too thick, thereby saving the manufacturing cost of the pallet.

[0048] Understandably, when the tray is fitted onto the outer periphery of the boss 21, the protruding rib 112 sinks into the relief groove 212.

[0049] Based on the above description, by way of example, the bottom of each of the two placement areas on the carrier plate 11 is provided with four rows of protruding ribs 112, each row including eight protruding ribs 112, that is, a single tray is provided with 64 protruding ribs 112, thereby forming 64 receiving slots 111 on the tray.

[0050] In addition to the receiving groove 111, the front of the carrier plate 11 is also provided with several alignment grooves 113. The alignment grooves 113 correspond one-to-one with the receiving grooves 111. The receiving grooves 111 are located at the bottom of the alignment grooves 113, and the opening size of the receiving grooves 111 is smaller than the bottom size of the alignment grooves 113. The alignment grooves 113 can facilitate the alignment of the robot arm, and the end of the robot arm can extend into the alignment grooves 113, thereby more accurately picking up the workpiece from the pallet.

[0051] It is understood that, in this embodiment, the alignment groove 113 is also formed in the protruding rib 112.

[0052] Furthermore, the front side of the carrier plate 11 is also provided with a plurality of pick-and-place slots 114, which correspond one-to-one with a plurality of receiving slots 111. The pick-and-place slots 114 include a first slot portion 1141 and a second slot portion 1142. The first slot portion 1141 and the second slot portion 1142 are respectively located on both sides of the receiving slot 111 in the horizontal direction, and both the first slot portion 1141 and the second slot portion 1142 penetrate the slot wall of the receiving slot 111 and communicate with the receiving slot 111. Thus, when the end of the robot arm extends into the alignment slot 113, the gripper located at the end of the robot arm can grip the workpiece through the pick-and-place slots 114. Specifically, the two claw portions of the gripper can respectively extend into the first slot portion 1141 and the second slot portion 1142, thereby being able to grip the workpiece from both sides. Therefore, this embodiment can facilitate the robot arm to pick up the workpiece.

[0053] It is understood that in this embodiment, the pick-and-place slot 114 is also formed in the protruding rib 112.

[0054] Based on the foregoing description, each of the two placement areas on the carrier plate 11 is provided with four rows of pick-up and drop slots 114, with each row including eight pick-up and drop slots 114, that is, a single pallet is provided with 64 pick-up and drop slots 114. It is worth noting that, in this embodiment, in any row of pick-up and drop slots 114, the first groove portion 1141 and the second groove portion 1142 of any pick-up and drop slot 114 are arranged along the arrangement direction of that row of pick-up and drop slots 114. Thus, for two adjacent pick-up and drop slots 114, the second groove portion 1142 of one pick-up and drop slot 114 is connected to the first groove portion 1141 of the other pick-up and drop slot 114, thereby facilitating pallet forming.

[0055] Furthermore, in this embodiment, the wall of the receiving groove 111 is inclined, so that the cross-sectional area of ​​the receiving groove 111 gradually decreases as the depth of the receiving groove 111 increases. For example, in this embodiment, the inclination angle of the wall of the receiving groove 111 is 13°, so that the wall of the receiving groove 111 can be prevented from scratching the workpiece when picking up and putting down the workpiece.

[0056] In addition, in this embodiment, the wall of the alignment groove 113 is inclined, so that the cross-sectional area of ​​the alignment groove 113 gradually decreases as the depth of the alignment groove 113 increases. For example, in this embodiment, the inclination angle of the wall of the alignment groove 113 is 3°, which makes it easier for the robot to move into or out of the alignment groove 113.

[0057] Furthermore, the walls of the receiving groove 111 and the alignment groove 113 are both inclined, which further facilitates pallet demolding during the pallet manufacturing process.

[0058] It is worth noting that during the process of handling pallets to transport workpieces, the pallets are generally stacked. That is, in this embodiment, by transporting a stack of pallets, the number of workpieces that can be transported at one time is increased.

[0059] Based on the above, for two stacked pallets, the protruding rib 112 of the upper pallet will extend into the protruding rib 112 of the lower pallet. In order to prevent the protruding rib 112 of the upper pallet from damaging the workpiece placed on the lower pallet, in this embodiment, the baffle platform 12 protrudes into the first groove 13 to form a positioning rib 1221. Specifically, the second plate portion 122 protrudes into the first groove 13 to form a positioning rib 1221, and positioning ribs 1221 are provided around the entire perimeter of the carrier plate 11.

[0060] Furthermore, from the side near the first plate 121 to the side near the support plate 14, the sidewall of the positioning rib 1221 opposite to the first plate 1211 is inclined toward the side near the carrier plate 11, and for example, the inclination angle is 10°.

[0061] With this setting, such as Figure 6 As shown, in the two stacked trays, the positioning rib 1221 of the upper tray presses against the second plate 1212 of the lower tray, thereby preventing the protruding rib 112 of the upper tray from extending excessively into the protruding rib 112 of the lower tray, and thus preventing the protruding rib 112 of the upper tray from damaging the workpiece placed on the lower tray.

[0062] Please continue reading Figures 1 to 8 Based on the above, the second plate portion 122 forms a plurality of positioning ribs 1221, which are distributed around the carrier plate 11. The boss 21 is provided with a plurality of positioning grooves 211, and the plurality of positioning ribs 1221 can be accommodated in the plurality of positioning grooves 211, thereby further positioning the pallet. Moreover, the positioning grooves 211 can provide guidance for placing the pallet, thereby facilitating the placement of the pallet on the outer periphery of the boss 21.

[0063] Furthermore, a guide rib 1222 is formed protruding from the second plate portion 122 toward the interior of the first groove 13. The guide rib 1222 bends toward the interior of the first groove 13 and forms an arc-shaped first guide groove 1223 on the outer wall of the second plate portion 122. The two ends of the first guide groove 1223 extend to the upper surface of the first plate portion 121 and the support plate 14, respectively.

[0064] Based on the above, in the two stacked trays, the guide rib 1222 of the upper tray slides into the first guide groove 1223 of the lower tray. That is, in this embodiment, the guide rib 1222 can play a guiding role when stacking trays, thereby facilitating the stacking of trays.

[0065] In addition, the second plate portion 122 has two guide ribs 1222 on both sides along the horizontal direction, and the boss 21 is provided with four arc-shaped second guide grooves 213. The four guide ribs 1222 can slide into the four second guide grooves 213 respectively, which makes it easier to put the tray on the outer periphery of the boss 21.

[0066] It is understood that in other alternative embodiments, other numbers of guide ribs 1222 may be provided on any side of the second plate portion 122 along the horizontal direction, and correspondingly, a corresponding number of second guide grooves 213 may be provided on the boss 21. This embodiment does not impose specific limitations on this.

[0067] Additionally, it should be noted that in this embodiment, the carrier plate 11 protrudes into the first groove 13 to form a support column 115, the support column 115 is hollow, and the bottom surface of the support column 115 is flush with the bottom surface of the support plate 14.

[0068] For example, in this embodiment, three support columns 115 are provided between the two placement areas on the carrier plate 11. Of course, in other optional embodiments, the carrier plate 11 may also be provided with other numbers of support columns 115 in other positions. This embodiment does not impose specific limitations on this.

[0069] When the pallet is fitted onto the outer periphery of the boss 21, the support column 115 sinks into the relief groove 212. Moreover, the support column 115 can press against the groove wall of the relief groove 212, so that the pallet can be placed more stably on the processing table 2.

[0070] like Figure 7 As shown, in the two stacked trays, the support column 115 of the upper tray extends into the support column 115 of the lower tray.

[0071] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A tray, characterized in that, include: A carrier plate (11) and a retaining platform (12) are provided. The retaining platform (12) surrounds the outer periphery of the carrier plate (11), and the back of the carrier plate (11) and the retaining platform (12) together form a first groove (13). The first groove (13) is similar in shape to the boss (21) provided on the processing machine table (2). A plurality of receiving grooves (111) are provided on the front side of the carrier plate (11), and the receiving grooves (111) are configured to accommodate workpieces. A support plate (14) is formed on the outer periphery of the enclosure platform (12) and surrounds the outer periphery of the opening of the first groove (13).

2. The pallet according to claim 1, characterized in that, The enclosure platform (12) includes a first plate portion (121) and a second plate portion (122). The first plate portion (121) surrounds the outer periphery of the carrier plate (11), and the second plate portion (122) connects the first plate portion (121) and the support plate (14). The upper surface of the first plate portion (121) is higher than the front surface of the carrier plate (11) so that the front surface of the carrier plate (11) and the first plate portion (121) together form a second groove (15).

3. The pallet according to claim 2, characterized in that, The carrier plate (11) has a plurality of protruding ribs (112) protruding into the first groove (13), and the receiving groove (111) is formed inside the protruding ribs (112).

4. The tray according to claim 3, characterized in that, The second plate portion (122) protrudes into the first groove (13) to form a positioning rib (1221). The positioning rib (1221) is provided around the carrier plate (11). In the two stacked trays, the positioning rib (1221) of the upper tray presses against the first plate portion (121) of the lower tray.

5. The pallet according to claim 2, characterized in that, The second plate portion (122) protrudes into the first groove (13) to form a guide rib (1222), the guide rib (1222) bends into the first groove (13) and forms a first guide groove (1223) on the outer wall of the second plate portion (122), the two ends of the first guide groove (1223) extending to the upper surface of the first plate portion (121) and the support plate (14) respectively.

6. The pallet according to claim 1, characterized in that, The front side of the carrier plate (11) is provided with a plurality of alignment grooves (113), and the plurality of alignment grooves (113) correspond one-to-one with the plurality of receiving grooves (111). The receiving grooves (111) are located at the bottom of the alignment grooves (113), and the opening size of the receiving grooves (111) is smaller than the bottom size of the alignment grooves (113).

7. The pallet according to claim 1, characterized in that, The front side of the carrier plate (11) is provided with a plurality of pick-up and put-down slots (114), and the plurality of pick-up and put-down slots (114) correspond one-to-one with the plurality of receiving slots (111). The pick-up and put-down slot (114) includes a first slot portion (1141) and a second slot portion (1142). The first slot portion (1141) and the second slot portion (1142) are respectively located on both sides of the receiving slot (111) along the horizontal direction, and the first slot portion (1141) and the second slot portion (1142) both penetrate the slot wall of the receiving slot (111) and communicate with the receiving slot (111).

8. The pallet according to claim 1, characterized in that, The carrier plate (11) protrudes into the first groove (13) to form a support column (115), the support column (115) is hollow, and the bottom surface of the support column (115) is flush with the bottom surface of the support plate (14).

9. A workpiece loading system, comprising a processing table (2) and a pallet as described in any one of claims 1-8, wherein the processing table (2) is used to hold the pallet, characterized in that, The processing table (2) is provided with a boss (21), and the tray is fitted around the outer periphery of the boss (21) through the first groove (13).

10. The workpiece feeding system according to claim 9, characterized in that, The enclosure platform (12) protrudes into the first groove (13) to form a positioning rib (1221), and the positioning rib (1221) is provided around the entire perimeter of the carrier plate (11). The boss (21) is provided with a plurality of positioning grooves (211), and the plurality of positioning ribs (1221) can be accommodated in the plurality of positioning grooves (211).

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