Coil unwinding device

Abstract

The present application belongs to the technical field of wireless charging, and discloses a coil tidying device, which comprises a coil carrier, a coil tidying platform and a coil tidying assembly, the coil carrier is used for carrying and fixing a coil to be tidied, the coil tidying platform is provided with a carrying part, the coil carrier is detachably fixed on the carrying part, and the coil tidying assembly is arranged on the coil tidying platform and can process two leads of the coil to be tidied into a predetermined shape. The coil tidying device provided by the present application can fix the coil to be tidied on the coil carrier when performing the coil tidying operation, then fix the coil carrier on the carrying part of the coil tidying platform, and then process the two leads of the coil to be tidied into a predetermined shape by using the coil tidying assembly. After the coil tidying operation is completed, the coil carrier is detached from the carrying part, so as to enter the next operation process. The coil tidying device provided by the present application can reduce the influence of manual operation on the accuracy of the coil and improve the work efficiency.

Description

Technical Field

[0001] This invention belongs to the field of wireless charging technology, and particularly relates to a coil management device. Background Technology

[0002] During the manufacturing process of a coil, the leads at both ends of the coil need to be straightened and bent into a predetermined shape. For example... Figure 1 As shown, the first lead 101' and the second lead 102' of coil 10' need to be formed as follows: Figure 1 As shown, the first lead 101' and the second lead 102' are side by side and form a set angle. However, the coil 10' wound by the winding machine may have an abnormal shape, for example, as... Figure 2 The first lead 101' and the second lead 102' in the coil intersect each other, causing the coil 10' to be out of shape and unable to proceed directly to the next process.

[0003] Currently, the above-mentioned substandard coil 10' is usually processed by manually bending the two leads. This manual operation is inefficient and the accuracy of the forming is low, which can easily affect the smooth progress of subsequent processes.

[0004] Therefore, there is an urgent need for a coil management device to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a coil winding device to improve the accuracy of coil winding and increase work efficiency.

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

[0007] Coil management device, including:

[0008] Coil carrier, used to hold and fix the coil to be processed;

[0009] A cable management platform having a support portion thereon, wherein the coil carrier is detachably fixed to the support portion;

[0010] A wire management assembly is disposed on the wire management platform, and the wire management assembly is capable of processing the two leads of the coil to be managed into a predetermined shape.

[0011] As a preferred embodiment of the above-mentioned coil wire management device, the wire management component includes:

[0012] Two pins are movably mounted on the cable management platform;

[0013] A transmission assembly is disposed on the cable management platform and connected to the two pins;

[0014] A driving component is disposed on the cable management platform. The output end of the driving component is connected to the transmission assembly. The driving component can drive the two pins to move closer to each other through the transmission assembly, so that the two leads located between the two pins are deformed into the predetermined shape.

[0015] As a preferred technical solution of the above-mentioned coil management device, the transmission component includes two rotating blocks, both of which are rotatably connected to the management platform. The two rotating blocks share a common rotation axis. The two pins are connected to the two rotating blocks in a one-to-one correspondence. The driving component is driven and connected to the two rotating blocks, and can drive the two rotating blocks to rotate towards each other or away from each other.

[0016] As a preferred technical solution of the above-mentioned coil winding device, the transmission component further includes two connecting rods, one end of which is a swing end and the other end is a moving end. The two swing ends are respectively rotatably connected to the two rotating blocks, and the two moving ends are simultaneously rotatably connected to the output end of the driving member. The driving member can drive the two moving ends to reciprocate along the first straight line direction at the same time, so as to drive the two rotating blocks to rotate towards each other or away from each other.

[0017] As a preferred technical solution of the above-mentioned coil wire management device, the wire management assembly further includes two lead wire limiting grooves, which are disposed on the wire management platform. The two lead wire limiting grooves are spaced apart from the pin. When the two leads of the coil to be managed are processed into a predetermined shape, the two leads are respectively passed through the two lead wire limiting grooves.

[0018] As a preferred technical solution of the above-mentioned coil winding device, a guide groove is provided on the winding platform, one end of the pin is movably disposed in the guide groove along the extension direction of the guide groove, and the other end extends to the side of the coil to be wound.

[0019] As a preferred embodiment of the above-mentioned coil management device, the coil carrier includes a base plate and a cover plate hinged to the base plate, with a portion of the coil to be managed sandwiched between the base plate and the cover plate.

[0020] As a preferred embodiment of the above-mentioned coil management device, the substrate and / or the cover plate are provided with a coil positioning part, and the coil to be managed is positioned in the coil positioning part.

[0021] As a preferred embodiment of the above-mentioned coil management device, the coil carrier further includes a pressure plate, which is hinged to the cover plate and can press against another part of the coil to be managed to flatten the lead wire.

[0022] As a preferred technical solution of the above-mentioned coil wire management device, the wire management platform includes a platform plate and at least two limiting blocks disposed on the platform plate, and the platform plate and all the limiting blocks form the bearing portion.

[0023] The beneficial effects of this invention are:

[0024] This invention provides a coil management device. During coil management, the coil to be managed is fixed to a coil carrier. Next, the coil carrier is fixed to a support portion of a coil management platform. Then, a coil management assembly processes the two leads of the coil to be managed into a predetermined shape. After the coil management is completed, the coil carrier is detached from the support portion for use in the next process. The coil management device provided by this invention can reduce the impact of manual operation on the accuracy of the coil and improve work efficiency. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a coil with a qualified lead shape in the prior art;

[0027] Figure 2 This is a schematic diagram of the structure of a coil with an unqualified lead shape in the prior art;

[0028] Figure 3 This is a frontal schematic diagram of the coil wire management device provided in an embodiment of the present invention when the wires are not managed;

[0029] Figure 4 This is a back view schematic diagram of the coil wire management device provided in the embodiment of the present invention when the wires are not managed;

[0030] Figure 5 This is a frontal schematic diagram of the coil wire management device provided in an embodiment of the present invention after wire management;

[0031] Figure 6 This is a schematic diagram of the coil wire management device provided in this embodiment of the invention after wire management;

[0032] Figure 7 The coil wire management device provided in the embodiment of the present invention is shown in the exploded view. Figure 1 ;

[0033] Figure 8 The coil wire management device provided in the embodiment of the present invention is shown in the exploded view. Figure 2;

[0034] Figure 9 This is a schematic diagram of the coil wire management device provided in an embodiment of the present invention after wire management;

[0035] Figure 10 yes Figure 9 Enlarged view of point A in the middle;

[0036] Figure 11 This is a frontal schematic diagram of the coil wire management device provided in this embodiment of the invention when the pressure plate flattens the lead wire.

[0037] In the picture:

[0038] Figure 1 and Figure 2 middle:

[0039] 10', coil; 101', first lead; 102', second lead;

[0040] Figures 3 to 11 middle:

[0041] 10. Coil to be processed; 101. Lead wire;

[0042] 1. Coil carrier; 2. Cable management platform; 3. Cable management assembly;

[0043] 11. Substrate; 12. Cover plate; 13. Pressure plate; 14. Handle; 21. Platform plate; 22. Limiting block; 23. Supporting part; 24. Side plate; 31. Pin; 32. Transmission assembly; 33. Driving component; 34. Lead wire limiting groove;

[0044] 111. Coil positioning part; 112. Limiting hole; 113. Through groove; 121. Groove; 122. Receiving groove; 131. Grip part; 132. Wire groove; 211. Guide groove; 212. Limiting post; 321. Rotating block; 322. Connecting rod; 323. First connecting shaft; 324. Bearing; 325. Second connecting shaft; 341. Protrusion. Detailed Implementation

[0045] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0046] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "installed" should be interpreted broadly. For example, they can refer to a mounting connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or 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 invention according to the specific circumstances.

[0047] In the description of this invention, unless otherwise expressly 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 being 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 being 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.

[0048] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0049] This embodiment provides a coil management device for, such as... Figure 2 The first lead 101' and the second lead 102' of the coil 10' in the cross state are processed as follows: Figure 1 The two rows are shown side by side at a set angle.

[0050] Specifically, such as Figures 3 to 6 As shown, the coil management device provided in this embodiment includes a coil carrier 1, a management platform 2, and a management assembly 3. The coil carrier 1 is used to support and fix the coil 10 to be managed. The management platform 2 has a support part 23, and the coil carrier 1 is detachably fixed to the support part 23. The management assembly 3 is disposed on the management platform 2 and can process the two leads 101 of the coil 10 to be managed into a predetermined shape.

[0051] It is understood that, in this embodiment, the predetermined shape is Figure 5 The shape of the two leads 101 is such that the two leads 101 are drawn out side by side from the exit position and extend along two directions with a set angle.

[0052] When performing coil management using the coil management device provided in this embodiment, the coil 10 to be managed is fixed to the coil carrier 1. Next, the coil carrier 1 is fixed to the support portion 23 of the coil management platform 2. Then, the two leads 101 of the coil 10 to be managed are processed into a predetermined shape using the coil management assembly 3. After the coil management operation is completed, the coil carrier 1 is removed from the support portion 23 for use in the next process. The coil management device provided in this embodiment can reduce the impact of manual operation on the accuracy of the coil and improve work efficiency.

[0053] Specifically, see [link to relevant documentation] Figures 3 to 6 The cable management assembly 3 includes a transmission assembly 32, a drive component 33, and two pins 31. The two pins 31 are movably mounted on the cable management platform 2. The transmission assembly 32 is mounted on the cable management platform 2 and connected to the two pins 31. The drive component 33 is mounted on the cable management platform 2, and its output end is connected to the transmission assembly 32. The drive component 33 can drive the two pins 31 to move closer to each other through the transmission assembly 32, so that the two leads 101 located between the two pins 31 are deformed into a predetermined shape. Specifically, as shown... Figure 3 and Figure 4 As shown, the two pins 31 are located on both sides of the exit positions of the two leads 101. The driving component 33 drives the two pins 31 to move closer to each other through the transmission assembly 32. During the approach process, the two pins 31 abut against the roots of the two leads 101, driving the two leads 101 to rotate towards each other, so that the included angle between the two leads 101 gradually decreases until the included angle between the two leads 101 reaches the following value: Figure 5 The set angle is shown.

[0054] Specifically, such as Figure 7 and Figure 8 As shown, the cable management platform 2 includes a platform plate 21, a support part 23 disposed on the front of the platform plate 21, a transmission assembly 32 and a drive component 33 disposed on the back of the platform plate 21, and two pins 31 with one end connected to the transmission assembly 32 and the other end passing through the platform plate 21 and exiting from the front of the platform plate 21, so that the pins 31 can abut against the lead wire 101. This arrangement avoids the transmission assembly 32 and the drive component 33 occupying the useful space on the front of the cable management platform 2, avoids interference with the fixation of the coil carrier 1, and protects the transmission assembly 32 and the drive component 33. The overall structure is compact and reasonably arranged.

[0055] Specifically, the cable management platform 2 also includes four side plates 24, which are respectively connected to the four sides of the back of the platform plate 21, forming an accommodating space with the platform plate 21. The transmission component 32 and the drive component 33 are located in the accommodating space, which improves the overall structural strength of the cable management platform 2 and further protects the transmission component 32 and the drive component 33.

[0056] For more details, see [link to relevant documentation] Figure 7 and Figure 8 The cable management platform 2 has a guide groove 211. One end of the pin 31 is movably disposed within the guide groove 211 along its extension direction, and the other end extends to the side of the coil 10 to be managed. In this embodiment, the platform plate 21 has a guide groove 211. One end of the pin 31 is connected to the transmission assembly 32 on the back of the platform plate 21 and passes through the guide groove 211. The other end passes through the front of the platform plate 21 and extends to the side of the coil 10 to be managed, so that the pin 31 can abut against the lead wire 101.

[0057] Specifically, see [link to relevant documentation] Figure 7 and Figure 8 The transmission assembly 32 includes two rotating blocks 321, both rotatably connected to the wire-reaming platform 2. The two rotating blocks 321 share a common rotation axis. Two shifting pins 31 are connected to the two rotating blocks 321 in a one-to-one correspondence. A driving component 33 is connected to the two rotating blocks 321 and can drive them to rotate towards or away from each other. When the two rotating blocks 321 rotate, they cause the two shifting pins 31 to move closer to or further away from each other along an arc path. Since the portion of the coil to be managed 10, excluding the lead wire 101, is annular, the movement of the shifting pins 31 along the arc path better drives the two lead wires 101 to move and deform, ensuring the effectiveness of lead wire 101 forming. In this embodiment, the guide groove 211 extends along the arc path, guiding the movement of the shifting pins 31.

[0058] Optionally, in other embodiments, the drive unit 33 may include two rotary drivers, which respectively drive two rotating blocks 321 to rotate, thereby causing the two dial pins 31 to move closer to or further away from each other along an arc path. The rotary drivers may be motors or rotary cylinders, etc.

[0059] In this embodiment, the driving element 33 is a linear actuator, which simultaneously drives two rotating blocks 321 to rotate.

[0060] Specifically, the transmission assembly 32 further includes two connecting rods 322, one end of which is a swinging end and the other end is a moving end. The two swinging ends are rotatably connected to two rotating blocks 321, and the two moving ends are simultaneously rotatably connected to the output end of the drive member 33. The drive member 33 can drive the two moving ends to reciprocate simultaneously along the first linear direction, thereby causing the two rotating blocks 321 to rotate towards each other or away from each other. Specifically, as shown... Figure 8As shown, two rotating blocks 321 are arranged sequentially in the second straight line direction, and two dial pins 31 are arranged sequentially in the second straight line direction. The second straight line direction is perpendicular to the first straight line direction. When the driving member 33 drives the moving ends of the two connecting rods 322 to move back and forth along the first straight line direction at the same time, the two swing ends swing around the moving ends in opposite directions, thereby driving the two rotating blocks 321 to rotate in opposite directions, which in turn causes the two dial pins 31 to move closer to or further away from each other.

[0061] More specifically, the rotating block 321 has a fan-shaped structure. One end of the arc-shaped edge of the rotating block 321 is fixedly connected to a dial pin 31, and the other end is rotatably connected to the swing end of the connecting rod 322. The two rotating blocks 321 share a common center, which is located on the rotation axis of the rotating blocks 321. In this embodiment, the two rotating blocks 321 are simultaneously connected to the platform plate 21 through the first connecting shaft 323, and a bearing 324 is provided between the platform plate 21 and the first connecting shaft 323.

[0062] More specifically, the moving ends of the two connecting rods 322 are simultaneously rotatably connected to the output end of the drive unit 33 via the second connecting shaft 325.

[0063] Optionally, the drive element 33 can be a linear cylinder or a linear motor, etc. In this embodiment, the drive element 33 is a linear cylinder.

[0064] Specifically, the cable management platform 2 also includes at least two limiting blocks 22 disposed on the platform plate 21, and the platform plate 21 and all the limiting blocks 22 form a supporting part 23. In this embodiment, there are two limiting blocks 22, and the platform plate 21 has a plurality of fixing holes. When the coil carrier 1 is fixed to the supporting part 23, two adjacent sidewalls of the coil carrier 1 abut against the two limiting blocks 22 respectively. At the same time, the coil carrier 1 is locked to the fixing holes on the platform plate 21 by screws or other fasteners, so as to securely fix the coil carrier 1, ensuring the smooth cable management. Moreover, the method of fastening with screws or other fasteners also facilitates disassembly.

[0065] Specifically, such as Figure 3 As shown, the cable management assembly 3 also includes two lead wire positioning grooves 34, which are disposed on the cable management platform 2. Both lead wire positioning grooves 34 and the guide pins 31 are spaced apart. When the two leads 101 of the cable management coil 10 are processed into a predetermined shape, the two leads 101 are respectively passed through the two lead wire positioning grooves 34. The two guide pins 31 are used to limit the position of the roots of the two leads 101, and the two lead wire positioning grooves 34 are used to limit the position of the heads of the two leads 101. That is, each lead 101 is positioned by two mutually spaced points, thereby limiting the position of the lead 101. Therefore, the setting of the lead wire positioning grooves 34 further ensures the accuracy of cable management.

[0066] like Figure 9and Figure 10 As shown, the cable management platform 2 is provided with four protrusions 341 arranged at intervals along the second straight line. Two adjacent protrusions 341 form a lead wire limiting groove 34, and another two adjacent protrusions 341 form another lead wire limiting groove 34. In this embodiment, the four protrusions 341 are disposed on a limiting block 22, and the protrusions 341 are cylindrical.

[0067] Specifically, such as Figure 7 As shown, the coil carrier 1 includes a base plate 11 and a cover plate 12 hinged to the base plate 11. A portion of the coil to be processed 10 is sandwiched between the base plate 11 and the cover plate 12. The base plate 11 and the cover plate 12 clamp a portion of the coil to be processed 10, fixing the coil to be processed 10 in place, while another portion of the coil to be processed 10 is exposed to the outside, as is the lead wire 101. A through slot 113 is provided on the base plate 11. The pin 31 passes through the through slot 113 and extends to the side of the lead wire 101, ensuring that the pin 31 can abut against the lead wire 101 after moving along the arc-shaped path.

[0068] See also Figure 7 A coil positioning portion 111 is provided on the substrate 11 and / or the cover plate 12, and the coil to be processed 10 is positioned in the coil positioning portion 111. In this embodiment, the coil positioning portion 111 is provided on the substrate 11. The coil positioning portion 111 is a cylindrical protrusion, and the size of the cylindrical protrusion is adapted to the inner circle size of the coil to be processed 10. The coil to be processed 10 is sleeved on the cylindrical protrusion to define the position of the coil to be processed 10. A portion of the coil positioning portion 111 is located in the through groove 113, and the coil to be processed 10 sleeved in this portion is exposed. The dialing needle 31 moves along the outer edge of this portion.

[0069] Specifically, a groove 121 is provided on the side of the cover plate 12 facing the substrate 11. When the cover plate 12 is closed on the substrate 11, the coil positioning part 111 and the coil to be processed 10 are both located in the groove 121, which further limits the position of the coil to be processed 10.

[0070] More specifically, the substrate 11 also has two limiting holes 112, and correspondingly, two limiting posts 212 are provided on the front side of the platform plate 21, with the two limiting posts 212 passing through the two limiting holes 112 one-to-one. This arrangement facilitates the positioning and installation of the coil carrier 1.

[0071] More specifically, the coil carrier 1 also includes a handle 14, which is fixedly connected to the substrate 11 for easy gripping and transfer.

[0072] Specifically, such as Figure 11As shown, the coil carrier 1 also includes a pressure plate 13, which is hinged to the cover plate 12. The pressure plate 13 can press against another part of the coil 10 to be processed, so as to flatten the lead wire 101. One side of the cover plate 12 is connected to the base plate 11, and the opposite side is connected to the pressure plate 13. After the wire processing assembly 3 has finished processing the coil 10, the pressure plate 13 is flipped to flatten the lead wire 101, which further improves the accuracy of wire processing.

[0073] More specifically, such as Figure 9 and Figure 11 As shown, gripping portions 131 are provided at both ends of the pressure plate 13 to facilitate gripping and flipping the pressure plate 13. A receiving groove 122 is provided on the side of the cover plate 12 away from the substrate 11. When the lead wire 101 is not flattened, the pressure plate 13 and the gripping portions 131 are simultaneously located in the receiving groove 122.

[0074] Specifically, such as Figure 9 As shown, a wire groove 132 is provided on the side of the pressure plate 13 facing away from the cover plate 12. A wire divider post is provided at the bottom of the wire groove 132, dividing the wire groove 132 into two wire routing channels. When the pressure plate 13 is flipped to press against the cover plate 12, the two leads 101 are respectively accommodated in the two wire routing channels. The arrangement of the wire routing channels can both moderately flatten the leads 101 and avoid the pressure plate 13 applying excessive pressure to the leads 101 and damaging the leads 101.

[0075] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. 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 the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A coil sorting device, characterized in that, The coil carrier (1) is used for carrying a coil (10) to be processed. The coil processing platform (2) has a carrying portion (23) on which the coil carrier (1) is detachably fixed. The coil processing assembly (3) is arranged on the coil processing platform (2) and can process two lead wires (101) of the coil (10) to be processed into a predetermined shape. The coil processing assembly (3) comprises two needle pushers (31) movably arranged on the coil processing platform (2), a transmission assembly (32) arranged on the coil processing platform (2) and connected to the two needle pushers (31), and a driving member (33) arranged on the coil processing platform (2) and connected to the transmission assembly (32) at an output end thereof, the driving member (33) being capable of driving the two needle pushers (31) to move towards each other through the transmission assembly (32) so that the two lead wires (101) located between the two needle pushers (31) are deformed into the predetermined shape. The transmission assembly (32) comprises two rotating blocks (321) each rotatably connected to the coil processing platform (2), the two rotating blocks (321) having a common rotating shaft, the two needle pushers (31) being one-to-one correspondingly connected to the two rotating blocks (321), and the driving member (33) being drivingly connected to the two rotating blocks (321) and capable of driving the two rotating blocks (321) to rotate towards or away from each other.

2. The coil threader of claim 1, wherein, The transmission assembly (32) further comprises two connecting rods (322), one end of each connecting rod (322) being a swinging end and the other end being a moving end, the two swinging ends being rotatably connected to the two rotating blocks (321) respectively, and the two moving ends being rotatably connected to the output end of the driving member (33) simultaneously, the driving member (33) being capable of driving the two moving ends to move reciprocally along a first straight line direction simultaneously so as to drive the two rotating blocks (321) to rotate towards or away from each other.

3. The coil threader of claim 2, wherein, The coil processing assembly (3) further comprises two lead wire limiting grooves (34) arranged on the coil processing platform (2), the two lead wire limiting grooves (34) and the needle pushers (31) each having a spacing, and the two lead wires (101) of the coil (10) to be processed being arranged in the two lead wire limiting grooves (34) respectively when the two lead wires (101) are processed into the predetermined shape.

4. The coil threader of claim 1, wherein, The coil processing platform (2) is provided with a guide groove (211), one end of each needle pusher (31) being movably arranged in the guide groove (211) along an extension direction of the guide groove (211), and the other end extending to a side of the coil (10) to be processed.

5. The coil threader of claim 1, wherein, The coil carrier (1) comprises a base plate (11) and a cover plate (12) hingedly connected to the base plate (11), and a part of the coil (10) to be processed is clamped between the base plate (11) and the cover plate (12).

6. The coil threader of claim 1, wherein, ​ 7. The coil threader of claim 6, wherein, The substrate (11) and / or the cover plate (12) is provided with a coil positioning portion (111), and the coil to be treated (10) is positioned on the coil positioning portion (111).

8. The coil threader of claim 6, wherein, The coil carrier (1) further comprises a pressing plate (13) hinged to the cover plate (12), and the pressing plate (13) can press on another part of the coil to be treated (10) to flatten the lead (101).

9. The coil threader of any of claims 1-8, wherein, The wire arranging platform (2) comprises a platform plate (21) and at least two limiting blocks (22) provided on the platform plate (21), and the platform plate (21) and all the limiting blocks (22) enclose the carrying portion (23).

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