Feeding machine for storage box machining

Abstract

The utility model relates to the technical field of storage box machining, and discloses a feeding machine for storage box machining, which comprises a supporting seat, a supporting plate is fixedly connected to the outer wall of one side of the supporting seat, a transverse moving assembly is arranged at the top end of the supporting plate, and first connecting plates are respectively arranged on two sides of the bottom end of the supporting plate. First sliding blocks are fixedly connected to one sides of the top ends of the two first connecting plates correspondingly, first sliding grooves matched with the first sliding blocks in size are transversely formed in the bottom end of the supporting plate, the two first connecting plates are slidably connected with the supporting plate through the first sliding blocks, and longitudinal moving assemblies are arranged at the bottom ends of the two first connecting plates correspondingly. The first double-end lead screw can rotate, two second connecting blocks are driven to move on the supporting plate in the opposite direction or the same direction under the action of threads, so that the feeding frame is driven to move transversely, the second double-end lead screw can rotate, and two third connecting blocks are driven to move in the opposite direction or the same direction under the action of threads. Therefore, the feeding frame is driven to move longitudinally.

Description

Technical Field

[0001] The utility model relates to the technical field of storage box processing, and specifically, to a feeding machine for storage box processing. Background Art

[0002] A storage box is a simple, lightweight and multifunctional storage container designed for organizing scattered items in the home. Storage boxes can be used to store various small items, such as books, newspapers, cosmetics, etc., to help classify and store items in the home, making the space more tidy and orderly. In the process of making storage boxes, a loader is required to load the storage boxes.

[0003] The existing devices have some disadvantages during use. For example, the existing storage box loaders usually use fixed-size conveyor tracks. However, when the size of the storage box exceeds the design range of the track, the stability of the conveyance will be seriously affected. Since the track size is fixed, it cannot adapt to storage boxes of different sizes, which may cause the storage box to shake, deviate or even fall off during the conveyance process, thereby affecting the normal operation of the production line. Utility Model Content

[0004] The utility model aims to provide a feeding machine for processing storage boxes, so as to solve the problem that the feeding machine for storage boxes can only convey storage boxes of fixed sizes.

[0005] The cam is an assembly made of a plurality of movable parts, each of which is connected to a pair of movable parts, and the movable part is connected to the pair of movable parts by a movable frame. The outer walls of one side of the two connecting plates close to the supporting column are respectively fixedly connected with a second sliding block adapted to the size of the second sliding groove, and the second connecting plate is slidably connected to the supporting seat through the second sliding block, and the outer walls of the two second connecting plates away from the supporting seat are respectively fixedly connected with a sliding column, and the outer sides of the two ends of the two sliding columns are respectively slidably sleeved with a first connecting block, and the tops of the four first connecting blocks are respectively fixedly connected with a third sliding block, and the bottom ends of the two second connecting plates are longitudinally provided with a third sliding groove adapted to the third sliding block, and the four first connecting blocks are slidably connected to the second connecting plate through the third sliding block, and one side of the four first connecting blocks is fixedly connected with a loading rack, and one side of the bottom of the four loading racks is respectively provided with a material dividing component.

[0006] In the above scheme, the design of the second slide groove and the second slider ensures the stability and accuracy of the second connecting plate during the sliding process. The coordinated use of the sliding column and the third slider allows the first connecting block to slide longitudinally on the second connecting plate. This design not only enhances the structural stability of the loading rack, but also ensures that the relative positions of the components remain stable during the adjustment process. The support seat provides a solid foundation for the entire structure through the fixedly connected support plate. The set lateral moving assembly and longitudinal moving assembly realize flexible adjustment of the position of the loading rack and the material dividing assembly.

[0007] As a preferred embodiment of the above technical solution, the horizontal moving component includes a fourth slide groove horizontally opened at the top of the support plate, and second connecting blocks are respectively provided at the two ends of the top of the support plate, and the bottom ends of the two second connecting blocks are fixedly connected with a fourth sliding block adapted to the fourth slide groove, and the two second connecting blocks are slidably connected to the support plate through the fourth sliding block, and the outer walls of the two second connecting blocks on one side away from the support seat are respectively fixedly connected with a loading rack, and the top of one side of the support plate is fixedly connected with a first motor, and the output end of the first motor is fixedly connected with a first double-headed screw rod, and the outer sides of the two ends of the first double-headed screw rod are respectively threadedly sleeved with corresponding second connecting blocks.

[0008] In the above scheme, the fourth slide groove is horizontally opened at the top of the support plate, providing a horizontal sliding track for the second connecting block, ensuring the stability and linearity of the second connecting block during movement. When the first motor is started, the first double-headed screw will rotate, and drive the two second connecting blocks to move in opposite or same directions on the support plate through the action of the thread, thereby driving the loading rack to move horizontally.

[0009] As a preferred embodiment of the above technical solution, the longitudinal moving component includes a fifth slide groove longitudinally opened at the bottom ends of the two first connecting plates, third connecting blocks are respectively arranged at both ends of the bottoms of the two first connecting plates, the top ends of the four third connecting blocks are fixedly connected with a fifth slider adapted to the fifth slide groove, the four third connecting blocks are slidably connected to the first connecting plates through the fifth slider, one side of the four third connecting blocks is respectively fixedly connected with a loading rack, the bottom ends of the two first connecting plates are respectively fixedly connected with a second motor on one side close to the support column, the output ends of the two second motors are respectively fixedly connected with the second double-headed screw rods, and the outer sides of the two ends of the two second double-headed screw rods are respectively threadedly sleeved with the corresponding third connecting blocks.

[0010] In the above scheme, the fifth slide groove longitudinally opened at the bottom end of the first connecting plate provides a track for longitudinal movement of the third connecting block, and the fifth slider adapted to the fifth slide groove ensures that the third connecting block can move smoothly along the slide groove. When the second motor is started, the second double-headed screw will rotate, and drive the two third connecting blocks to move in opposite or same directions through the action of the thread, thereby driving the loading rack to move longitudinally.

[0011] As a preferred embodiment of the above technical solution, the material dividing assembly includes fourth connecting blocks respectively fixedly connected to the outer wall of one side of the bottom of four loading racks, the four fourth connecting blocks are fixedly connected to the third motors on the opposite sides, the output ends of the four third motors are respectively fixedly connected to the rotating shafts, the four rotating shafts respectively pass through the corresponding fourth connecting blocks and are rotatably connected to the fourth connecting blocks, and the four rotating shafts are fixedly connected to the ends away from the third motors with material dividing wheels.

[0012] In the above scheme, the rotating shaft is driven by the third motor, so that the rotating shaft drives the dividing wheel to rotate. During the rotation of the dividing wheel, it will contact the stacked storage boxes and exert a certain force. This force separates the storage boxes at the bottom layer, so that the storage boxes are pushed to the predetermined position.

[0013] As a preferred embodiment of the above technical solution, the fourth slide groove is provided with first limiting grooves on two opposite sides of the bottom end, and the top ends of the two fifth sliding blocks are fixedly connected with first limiting blocks adapted to the size of the first limiting grooves on two outer side walls respectively, and the two second connecting blocks are slidably connected to the first limiting grooves through the first limiting blocks.

[0014] In the above scheme, through the coordinated use of the first limit block and the first limit groove, the movement of the second connecting block in the fourth slide groove is effectively constrained and guided, which not only ensures that the second connecting block slides smoothly along the predetermined path and reduces the possibility of shaking and deviation, but also improves the stability of the entire lateral moving assembly.

[0015] As a preferred embodiment of the above technical solution, second limiting grooves are respectively opened on two opposite sides of the top of the two fifth sliding grooves, and second limiting blocks adapted to the size of the second limiting grooves are respectively fixedly connected to the top of the four fifth sliding blocks relative to the two outer walls, and the four third connecting blocks are slidably connected to the second limiting grooves through the second limiting blocks.

[0016] In the above scheme, through the coordinated use of the second limit block and the second limit groove, the movement of the third connecting block in the fifth slide groove is effectively constrained and guided, which not only ensures that the third connecting block slides smoothly along the predetermined path and reduces the possibility of shaking and deviation, but also improves the stability of the entire longitudinal moving assembly.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] In the utility model, the fourth slide groove is transversely opened at the top of the support plate, providing a stable sliding track for the second connecting block, ensuring the stability and linearity of the second connecting block during movement, this design effectively prevents the loading rack from offsetting or shaking during transverse movement, and improves the accuracy and reliability of the entire loading process, when the first motor is started, the first double-headed screw drives the two second connecting blocks to move in opposite or same directions on the support plate through thread action, this driving method is not only efficient, but also can achieve precise positioning of the loading rack, the fifth slide groove longitudinally opened at the bottom end of the first connecting plate provides a track for longitudinal movement for the third connecting block, and the fifth slider adapted to the fifth slide groove ensures that the third connecting block can move smoothly along the slide groove, this design enables the loading rack to remain stable and stable during longitudinal movement, reducing errors and faults caused by shaking or jittering, through the drive of the second motor, the second double-headed screw can drive the two third connecting blocks to move in opposite or same directions, thereby realizing the longitudinal movement of the loading rack, this design enables the loading machine to flexibly adjust the position of the loading rack according to storage boxes of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of a loading machine for processing storage boxes;

[0020] Figure 2 It is a side view structural schematic diagram of a material loading machine for processing storage boxes;

[0021] Figure 3 It is a schematic diagram of the structure of a second connecting plate in a loading machine for processing storage boxes;

[0022] Figure 4 It is a partial cross-sectional structural schematic diagram of a second connecting plate in a loading machine for processing storage boxes;

[0023] Figure 5 It is a schematic diagram of the partial structure of a first connecting block in a loading machine for processing storage boxes;

[0024] Figure 6 It is a schematic diagram of the structure of a lateral moving component in a loading machine for processing storage boxes;

[0025] Figure 7 It is a partial cross-sectional structural schematic diagram of a second connecting block in a loading machine for processing storage boxes;

[0026] Figure 8 It is a schematic diagram of the structure of a longitudinal moving component in a loading machine for processing storage boxes;

[0027] Fig. 9 It is a schematic diagram of a partial cross-sectional structure of a first connecting plate in a loading machine for processing storage boxes;

[0028] Fig.10 It is a schematic diagram of a partial cross-sectional structure of a third connecting block in a loading machine for processing storage boxes.

[0029] In the figure: 10, support seat; 11, support plate; 12, first connecting plate; 13, first slider; 14, first slide groove; 15, second slide groove; 16, second connecting plate; 17, second slider; 18, sliding column; 19, first connecting block; 191, third slider; 192, third slide groove; 193, loading rack; 20, fourth slide groove; 21, second connecting block; 22, fourth slider; 23, first motor; 24, first double-ended screw rod; 30, fifth slide groove; 31, third connecting block; 32, fifth slider; 33, second motor; 34, second double-ended screw rod; 40, fourth connecting block; 41, third motor; 42, rotating shaft; 43, dividing wheel; 50, first limiting groove; 51, first limiting block; 60, second limiting groove; 61, second limiting block. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Example

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the utility model provides a technical solution: a material loading machine for processing storage boxes, including a support seat 10, a support plate 11 is fixedly connected to an outer wall of one side of the support seat 10, a lateral moving component is arranged on the top of the support plate 11, first connecting plates 12 are arranged on both sides of the bottom end of the support plate 11, and first sliding blocks 13 are fixedly connected to the top sides of the two first connecting plates 12, and first sliding grooves 14 adapted to the size of the first sliding blocks 13 are opened horizontally at the bottom end of the support plate 11, and the two first connecting plates 12 are slidably connected to the support plate 11 through the first sliding blocks 13. The bottom ends of the first connecting plates 12 are respectively provided with longitudinal moving components, the outer wall on one side of the top of the support seat 10 is horizontally provided with a second slide groove 15, and the two ends of the second slide groove 15 are respectively provided with second connecting plates 16, and the outer walls on one side of the two second connecting plates 16 close to the support column are respectively fixedly connected with second sliders 17 adapted to the size of the second slide groove 15, and the second connecting plates 16 are slidably connected to the support seat 10 through the second sliders 17, and the outer walls on the side of the two second connecting plates 16 away from the support seat 10 are respectively fixedly connected with sliding columns 18, and the outer sides of the two ends of the two sliding columns 18 The first connecting blocks 19 are respectively slidably sleeved, and the top ends of the four first connecting blocks 19 are respectively fixedly connected to the third sliding blocks 191, and the bottom ends of the two second connecting plates 16 are longitudinally provided with third sliding grooves 192 adapted to the third sliding blocks 191. The four first connecting blocks 19 are slidably connected to the second connecting plates 16 through the third sliding blocks 191, and one side of the four first connecting blocks 19 is fixedly connected to a loading rack 193, and one side of the bottom of the four loading racks 193 is respectively provided with a material dividing assembly. In specific use, the design of the second sliding groove 15 and the second sliding block 17 ensures the stability and accuracy of the second connecting plate 16 during the sliding process. The coordinated use of the sliding column 18 and the third sliding block 191 enables the first connecting block 19 to slide longitudinally on the second connecting plate 16. This design not only enhances the structural stability of the loading rack 193, but also ensures that the relative positions of the components remain stable during the adjustment process. The support seat 10 provides a solid foundation for the entire structure through the fixedly connected support plate 11, and the set lateral moving assembly and longitudinal moving assembly realize flexible adjustment of the positions of the loading rack 193 and the material dividing assembly.

[0032] As an implementation method in this embodiment, Figure 6 and Figure 7As shown, the lateral movement component includes a fourth slide groove 20 that is horizontally opened at the top of the support plate 11, and second connecting blocks 21 are respectively provided at both ends of the top of the support plate 11. The bottom ends of the two second connecting blocks 21 are fixedly connected with fourth sliders 22 adapted to the fourth slide groove 20. The two second connecting blocks 21 are slidably connected to the support plate 11 through the fourth sliders 22. The outer walls of the two second connecting blocks 21 on one side away from the support seat 10 are respectively fixedly connected with the loading rack 193. The top of one side of the support plate 11 is fixedly connected with a first motor 23, and the output end of the first motor 23 is fixedly connected The first double-headed screw rod 24 has two ends whose outer sides are respectively threadedly sleeved with the corresponding second connecting blocks 21. During specific use, the fourth slide groove 20 is horizontally opened at the top of the support plate 11, providing a horizontal sliding track for the second connecting block 21, ensuring the stability and linearity of the second connecting block 21 during movement. When the first motor 23 is started, the first double-headed screw rod 24 will rotate, and the two second connecting blocks 21 are driven to move in opposite or same directions on the support plate 11 through the action of the thread, thereby driving the loading rack 193 to move horizontally.

[0033] As an implementation method in this embodiment, Figure 8 , Fig. 9 and Fig.10 As shown, the longitudinal moving component includes a fifth slide groove 30 longitudinally opened at the bottom ends of the two first connecting plates 12, and the two ends of the bottom of the two first connecting plates 12 are respectively provided with third connecting blocks 31, and the top ends of the four third connecting blocks 31 are fixedly connected with a fifth slider 32 adapted to the fifth slide groove 30, and the four third connecting blocks 31 are slidably connected to the first connecting plate 12 through the fifth slider 32, and one side of the four third connecting blocks 31 is respectively fixedly connected with a loading rack 193, and the bottom ends of the two first connecting plates 12 are respectively fixedly connected with a second motor 33 on one side close to the support column, and the output ends of the two second motors 33 are respectively fixed The second double-headed screw rod 34 is connected, and the outer sides of the two ends of the two second double-headed screw rods 34 are respectively threadedly sleeved with the corresponding third connecting blocks 31. During specific use, the fifth slide groove 30 longitudinally opened at the bottom end of the first connecting plate 12 provides a track for longitudinal movement of the third connecting block 31, and the fifth slider 32 adapted to the fifth slide groove 30 ensures that the third connecting block 31 can move smoothly along the slide groove. When the second motor 33 is started, the second double-headed screw rod 34 will rotate, and the two third connecting blocks 31 are driven to move in opposite or same directions through the action of the thread, thereby driving the loading rack 193 to move longitudinally.

[0034] As an implementation method in this embodiment, Figure 1 and Figure 2As shown, the material dividing assembly includes fourth connecting blocks 40 respectively fixedly connected to the outer wall of one side of the bottom of four loading racks 193, third motors 41 are fixedly connected to the opposite sides of the four fourth connecting blocks 40, and the output ends of the four third motors 41 are respectively fixedly connected to rotating shafts 42, and the four rotating shafts 42 respectively penetrate the corresponding fourth connecting blocks 40 and are rotatably connected to the fourth connecting blocks 40, and one end of the four rotating shafts 42 away from the third motor 41 is fixedly connected to a material dividing wheel 43. During specific use, the rotating shaft 42 is driven by the third motor 41 to make the rotating shaft 42 drive the material dividing wheel 43 to rotate. During the rotation of the material dividing wheel 43, it will contact the stacked storage boxes and exert a certain force, which separates the storage boxes on the bottom layer and pushes the storage boxes to the predetermined positions.

[0035] As an implementation method in this embodiment, Figure 7 As shown, first limiting grooves 50 are provided on opposite sides of the bottom end of the fourth slide groove 20, and first limiting blocks 51 adapted to the size of the first limiting grooves 50 are fixedly connected to the top ends of the two fifth sliding blocks 32 relative to the two outer side walls, respectively. The two second connecting blocks 21 are slidably connected to the first limiting grooves 50 through the first limiting blocks 51. During specific use, the movement of the second connecting blocks 21 in the fourth slide groove 20 is effectively constrained and guided by the coordinated use of the first limiting blocks 51 and the first limiting grooves 50, which can not only ensure that the second connecting blocks 21 slide smoothly along the predetermined path and reduce the possibility of shaking and deviation, but also improve the stability of the entire lateral moving assembly.

[0036] As an implementation method in this embodiment, Fig.10 As shown, second limiting grooves 60 are respectively provided on two opposite sides of the top ends of the two fifth slide grooves 30, and second limiting blocks 61 adapted to the size of the second limiting grooves 60 are respectively fixedly connected to the top ends of the four fifth sliding blocks 32 relative to the two outer side walls, and the four third connecting blocks 31 are slidably connected to the second limiting grooves 60 through the second limiting blocks 61. During specific use, the movement of the third connecting blocks 31 in the fifth slide grooves 30 is effectively constrained and guided by the coordinated use of the second limiting blocks 61 and the second limiting grooves 60, which can not only ensure that the third connecting blocks 31 slide smoothly along the predetermined path and reduce the possibility of shaking and deviation, but also improve the stability of the entire longitudinal moving assembly.

[0037] Working principle: When the first motor 23 is started, the first double-headed screw 24 will rotate, and the two second connecting blocks 21 will be driven to move in opposite or same directions on the support plate 11 through the action of the thread, thereby driving the loading rack 193 to move horizontally, and the second double-headed screw 34 will rotate, and the two third connecting blocks 31 will be driven to move in opposite or same directions through the action of the thread, thereby driving the loading rack 193 to move longitudinally. At the same time, the cooperation of the sliding column 18 and the third sliding block 191 allows the first connecting block 19 to slide longitudinally on the second connecting plate 16. This design not only enhances the structural stability of the loading rack 193, but also ensures that the relative positions of the components remain stable during the adjustment process, and prevents loading errors caused by shaking or offset. The rotating shaft 42 is driven by the third motor 41, so that the rotating shaft 42 drives the dividing wheel 43 to load the storage box. During the rotation of the dividing wheel 43, it will contact the stacked storage boxes and exert a certain force. This force separates the storage boxes on the bottom layer, so that the storage boxes are pushed to the predetermined position.

[0038] The above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it.

Claims

1. A material loading machine for processing a storage box, comprising a support seat (10), characterized in that: The outer wall of one side of the support seat (10) is fixedly connected to a support plate (11), and a transverse moving component is arranged at the top of the support plate (11), and first connecting plates (12) are respectively arranged on both sides of the bottom end of the support plate (11), and the top sides of the two first connecting plates (12) are respectively fixedly connected to a first slider (13), and the bottom end of the support plate (11) is transversely provided with a first slide groove (14) adapted to the size of the first slider (13), and the two first connecting plates (12) are slidably connected to the support plate (11) through the first slider (13), and the bottom ends of the two first connecting plates (12) are respectively provided with a longitudinal moving component, and the outer wall of one side of the top of the support seat (10) is transversely provided with a second slide groove (15), and the two ends of the second slide groove (15) are respectively provided with second connecting plates (16), and the outer walls of the two second connecting plates (16) on one side close to the support column are respectively fixedly connected with a first slide groove (14) adapted to the size of the first slider (13). A second slider (17) of a size similar to that of the second slide groove (15); the second connecting plate (16) is slidably connected to the support seat (10) through the second slider (17); the outer walls of the two second connecting plates (16) on one side away from the support seat (10) are respectively fixedly connected with sliding columns (18); the outer sides of the two ends of the two sliding columns (18) are respectively slidably sleeved with first connecting blocks (19); the top ends of the four first connecting blocks (19) are respectively fixedly connected with third sliders (191); the bottom ends of the two second connecting plates (16) are longitudinally provided with third slide grooves (192) adapted to the third sliders (191); the four first connecting blocks (19) are slidably connected to the second connecting plates (16) through the third sliders (191); one side of the four first connecting blocks (19) is fixedly connected with a loading rack (193); and one side of the bottom of the four loading racks (193) is respectively provided with a material dividing assembly.

2. A material feeding machine for storage box processing according to claim 1, characterized in that: The lateral movement assembly comprises a fourth slide groove (20) which is laterally opened at the top of the support plate (11); second connecting blocks (21) are respectively arranged at two ends of the top of the support plate (11); the bottom ends of the two second connecting blocks (21) are fixedly connected with fourth sliders (22) adapted to the fourth slide groove (20); the two second connecting blocks (21) are slidably connected to the support plate (11) via the fourth sliders (22); the outer walls of the two second connecting blocks (21) on one side away from the support seat (10) are respectively fixedly connected with a loading rack (193); the top of one side of the support plate (11) is fixedly connected with a first motor (23); the output end of the first motor (23) is fixedly connected with a first double-headed screw rod (24); and the outer sides of the two ends of the first double-headed screw rod (24) are respectively threadedly sleeved with the corresponding second connecting blocks (21).

3. A material feeding machine for processing a storage box according to claim 2, characterized in that: The longitudinal moving assembly comprises a fifth slide groove (30) longitudinally opened at the bottom ends of the two first connecting plates (12), third connecting blocks (31) are respectively arranged at both ends of the bottom ends of the two first connecting plates (12), the top ends of the four third connecting blocks (31) are fixedly connected with a fifth slider (32) adapted to the fifth slide groove (30), the four third connecting blocks (31) are slidably connected to the first connecting plates (12) through the fifth slider (32), one side of the four third connecting blocks (31) is respectively fixedly connected with a loading rack (193), one side of the bottom ends of the two first connecting plates (12) close to the supporting column is respectively fixedly connected with a second motor (33), the output ends of the two second motors (33) are respectively fixedly connected with a second double-headed screw rod (34), and the outer sides of the two ends of the two second double-headed screw rods (34) are respectively threadedly sleeved with the corresponding third connecting blocks (31).

4. The material loading machine for storage box processing according to claim 1, characterized in that: The material distribution assembly comprises fourth connecting blocks (40) respectively fixedly connected to the outer wall of one side of the bottom of four loading racks (193); the third motors (41) are fixedly connected to the opposite sides of the four fourth connecting blocks (40); the output ends of the four third motors (41) are respectively fixedly connected to rotating shafts (42); the four rotating shafts (42) respectively penetrate the corresponding fourth connecting blocks (40) and are rotatably connected to the fourth connecting blocks (40); and the ends of the four rotating shafts (42) away from the third motors (41) are fixedly connected to the material distribution wheels (43).

5. The material loading machine for storage box processing according to claim 3, characterized in that: The bottom end of the fourth sliding groove (20) is provided with first limiting grooves (50) on opposite sides, and the top ends of the two fifth sliding blocks (32) are respectively fixedly connected with first limiting blocks (51) adapted to the size of the first limiting grooves (50) on opposite outer side walls, and the two second connection blocks (21) are slidably connected to the first limiting grooves (50) via the first limiting blocks (51).

6. The material loading machine for storage box processing according to claim 3, characterized in that: The top ends of the two fifth sliding grooves (30) are respectively provided with second limiting grooves (60) on opposite sides, the top ends of the four fifth sliding blocks (32) are respectively fixedly connected with second limiting blocks (61) adapted to the size of the second limiting grooves (60) on opposite outer side walls, and the four third connecting blocks (31) are slidably connected to the second limiting grooves (60) via the second limiting blocks (61).

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