Stepping conveyor for cable drum

Abstract

The invention discloses a cable drum stepping conveyor, and belongs to the technical field of stereoscopic warehouses. Comprising a support, and the support extends inwards to the stereoscopic warehouse and is matched with an automatic pallet fork. Conveying chains are assembled on the two sides of the support to operate in the warehouse-in and warehouse-out direction. Wire coil positioning and placing devices which move synchronously are assembled on the inner sides of the two conveying chains. The wire coil positioning and placing device forms a placing position where the axial direction of the wire coil is consistent with the conveying direction. According to the invention, through short-distance conveying design, interaction of cable drums inside and outside the intelligent stereoscopic warehouse is realized; warehousing of the cable drum can be realized, and ex-warehouse of the cable drum can also be realized; an operator or other equipment is prevented from directly entering the vertical warehouse for operation, and the safety during interaction of the cable drums is ensured; the cable drum stepping conveyor is adopted, accurate stepping conveying is achieved, the production efficiency is improved, the production safety risk is greatly reduced, and safety accidents of the working environment are reduced; and the structure is simple and mature, and maintenance is easy.

Description

Technical Field

[0001] This invention relates to the field of automated warehouse technology, and more particularly to a cable reel stepping conveyor. Background Technology

[0002] In the process of cable reels entering and leaving the automated warehouse, the reels are usually transported directly to the receiving point (located below the automated racking) by the operator. In this mode, the operator needs to walk through the racking, which is a narrow space and unsafe, making it prone to accidents.

[0003] Based on the above issues, our company designed a cable reel stepping conveyor according to the actual site conditions. This separates the outside of the automated warehouse from the warehouse itself, and connects the two by means of the cable reel stepping conveyor, realizing fully automated logistics. This avoids operators directly interacting with materials in the intelligent automated warehouse, reduces safety risks, and improves the on-site working environment. Summary of the Invention

[0004] The purpose of this invention is to provide a cable reel stepping conveyor that can efficiently and safely realize the loading and unloading of cable reels.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A cable reel stepping conveyor includes a support frame that extends inward into an automated warehouse and cooperates with an automatic forklift. Conveyor chains are mounted on both sides of the support frame and operate in the direction of entering and exiting the warehouse. Synchronously moving cable reel positioning and placement devices are mounted on the inner sides of the two conveyor chains. The cable reel positioning and placement devices form a placement position where the axial direction of the cable reel is consistent with the conveying direction.

[0006] In some embodiments, the placement space above the support along the conveying direction is not less than two reel placement positions.

[0007] In some embodiments, each end of the cable reel positioning and placement device forms a cable placement position.

[0008] In some embodiments, the spool positioning and placement device consists of a support beam and a spool placement block mounted on the support beam; each set of spool positioning and placement devices is provided with two cooperating support beams.

[0009] In some embodiments, the trailing beam includes: a U-shaped curved beam in the middle portion, and end crossbeams integrally disposed at both ends of the U-shaped curved beam; the coil placement block is fixedly mounted above the end crossbeams.

[0010] In some embodiments, the conveyor chain is integrally provided with a bent assembly piece corresponding to the chain plate of the reel positioning and placement device, and is bolted and fixed to the reel positioning and placement device.

[0011] In some embodiments, one end of the conveyor chain is fitted with a drive wheel, and the other end is fitted with a driven wheel; the driven wheel is fitted with a tension adjustment assembly.

[0012] In some embodiments, the tension adjustment assembly includes: an outer opening box, guide plates mounted on the upper and lower ends inside the outer opening box, and a traction block slidably mounted between the two guide plates; the traction block is equipped with a bearing, and one end is adjusted by a long screw and a nut.

[0013] In some embodiments, a slotted switch is installed inside the bracket, and a trigger plate is correspondingly provided at the lower end of the coil positioning and placement device.

[0014] In some embodiments, the bracket consists of: legs and cross braces; the top of the legs extends inward to be fitted with an L-shaped connecting plate; and a frame beam is fitted above the L-shaped connecting plate.

[0015] Compared with the prior art, the present invention provides a cable reel step conveyor with the following advantages.

[0016] 1. This invention, through a short-distance conveying design, enables the interaction of cable reels inside and outside the intelligent automated warehouse; it can realize the entry and exit of cable reels; it avoids operators or other equipment from directly entering the warehouse for operation, ensuring the safety of cable reel interaction.

[0017] 2. This invention separates the outside of the automated warehouse from the warehouse itself, and connects the two by using a cable reel stepping conveyor to achieve fully automated logistics, reduce safety risks, and improve the on-site working environment. The cable reel stepping conveyor adopts a two-reel-per-step design, that is, it can transport two reels in one step, which doubles the working efficiency.

[0018] 3. This invention uses a cable reel stepping conveyor for precise stepping conveying, which realizes the interaction of cable reels inside and outside the intelligent automated warehouse, improves production efficiency, greatly reduces production safety risks, and reduces the occurrence of workplace safety accidents; moreover, the structure is simple and mature, and easy to maintain.

[0019] Other advantages, objectives and features of the invention will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art upon examination of the following description; or may be learned from practice of the invention. Attached Figure Description

[0020] Figure 1 This is a diagram showing the placement of the cable reel.

[0021] Figure 2This is a side view showing the cable reel in its placement.

[0022] Figure 3 This is a schematic diagram of the structure of the present invention.

[0023] Figure 4 for Figure 3 A magnified structural diagram of point A in the middle.

[0024] Figure 5 This is a partial structural schematic diagram of the present invention.

[0025] Figure 6 for Figure 5 A magnified structural diagram at point B in the middle.

[0026] Figure 7 for Figure 5 A magnified structural diagram at point C.

[0027] Figure 8 This is a schematic diagram of the support structure.

[0028] Figure 9 for Figure 8 A magnified structural diagram at point D.

[0029] Figure 10 This is a schematic diagram of the lower side of the conveyor chain.

[0030] Figure 11 for Figure 10 A magnified structural diagram at point E in the middle.

[0031] Figure 12 This is a schematic diagram of the tension adjustment assembly.

[0032] Figure 13 This is a side view of the tension adjustment assembly.

[0033] Figure 14 This is an exploded view of the tension adjustment assembly.

[0034] Figure 15 A schematic diagram of the positioning and placement device for a set of reels.

[0035] Figure 16 A schematic diagram of the lower side of the coil positioning and placement device.

[0036] Figure 17 for Figure 16 A magnified structural diagram at point F in the middle.

[0037] Figure 18 A partial exploded diagram of the device for positioning and placing the wire reel.

[0038] Figure 19 This is a schematic diagram of the exploded state of the end beam.

[0039] Figure 20 This is a schematic diagram illustrating the usage state of the present invention.

[0040] Figure 21 This is a schematic diagram of a conveyor chain.

[0041] In the picture: 1. Support frame; 11. Support leg; 12. Cross brace; 13. L-shaped connecting plate; 14. Side beam; 2. Conveyor chain; 20. Bending assembly piece; 21. Drive wheel; 22. Driven wheel; 23. Synchronous shaft; 3. Wire reel positioning and placement device; 31. Trailing beam; 32. Wire reel placement block; 311. U-shaped curved beam; 312. End crossbeam; 313. Pad plate; 321. Edge retainer; 322. Groove area; 4. Directional wheel; 5. Longitudinal pad beam; 6. Tension adjustment assembly; 61. Outer opening box; 62. Guide plate; 63. Pulling block; 64. Long screw; 65. End plate; 7. Slotted switch; 71. Trigger plate; 8. Chain pad block. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0043] Reference Figure 1-19 A cable reel stepping conveyor includes a support 1 that extends inward to an automated warehouse and cooperates with the automated warehouse's material handling device (automatic forklift); conveyor chains 2 are mounted on both sides of the support 1 and operate in the direction of entering and exiting the warehouse; cable reel positioning and placement devices 3 that move synchronously with the conveyor chains 2 are mounted on the inner sides of the two conveyor chains 2; the cable reel positioning and placement devices 3 form a placement position where the axial direction of the cable reel is consistent with the conveying direction.

[0044] like Figure 1 As shown, the cable reel positioning and placement device 3 supports the cable reel. Driven by the conveyor chain 2, after reaching the working position of the automatic forklift, the cable reel is moved away and stored by the automatic forklift. Then, the next cable reel moves forward, and after reaching its position, the returning automatic forklift moves and stores this cable reel again. The conveyor chain 2 operates in a cyclical manner, conveying cable reels forward in groups, while the automatic forklift continuously performs storage operations. During the operation, no complex manual operation is required; the operator simply places the cable reel onto the cable reel positioning and placement device 3.

[0045] like Figure 20 As shown, a forklift is used to place the cable reel onto the cable reel positioning device 3; the left side is the forklift, and the right side is the automated warehouse material handling device; the box to the right of the cable reel walking conveyor is a schematic diagram of the automated warehouse.

[0046] It is important to note that the placement space above bracket 1 along the conveying direction should be no less than two sets of reel placement positions, with a spacing between the placement positions; that is, at least two sets of placement positions should be formed in the front-to-back direction; such as Figure 1 As shown, it simultaneously carries two sets of cable reels, one in front and one behind. This way, after the front cable reel is completely moved away by the automatic forks, the next set of cable reels can move forward; once in position, the cable reel can be placed onto the rear cable reel positioning device 3 by the forklift; there is no need for continuous waiting, which greatly improves work efficiency.

[0047] Furthermore, such as Figure 20 As shown, the cable reel positioning and placement device 3 forms a side-by-side placement position for two cable reels. That is to say, each time two cable reels are transported, they are moved as a group; correspondingly, a double-bar forklift is used to simultaneously pick up and place the two cable reels, making the operation more convenient and safer.

[0048] In operation, this device uses a forklift to place the cable reel onto the cable reel positioning device 3. Then, the conveyor chain 2 moves the cable reel positioning device 3 towards the automated storage and retrieval system (AS / RS). Once in position, it is picked up by the AS / RS's automatic forks. After one set of cable reels is stored, the next set moves forward, and this cycle continues continuously. Conversely, when a cable reel needs to be retrieved, the forklift waits outside. The AS / RS's automatic forks remove the cable reel and place it on the cable reel positioning device 3. The conveyor chain 2 adjusts its direction, moving the cable reel positioning device 3 outwards. Once in position, the forklift removes the cable reel.

[0049] In some embodiments, the reel positioning and placement device 3 comprises: It consists of a trailing beam 31 and a coil placement block 32 mounted on the trailing beam 31.

[0050] Correspondingly, each set of cable reel positioning and placement devices 3 is equipped with two cooperating drag beams 31 to provide support for both ends of the cable reel and form a reliable limit.

[0051] like Figure 15 As shown, a V-shaped placement groove is formed above the cable reel placement block 32, which can accommodate various specifications of cable reels and ensure the accurate placement of the cable reels.

[0052] Furthermore, the online tray placement block 32 has a retaining edge 321 on one or both sides. For example, in Figure 15 In the middle, a retaining edge 321 is set on one side to block one side of the V-shaped placement groove; after the cable reel is placed in place, it is limited by the retaining edge 321 and will not move back and forth.

[0053] It should be noted that when setting the baffle 321 on one side, the baffles 321 of the two cable reel placement blocks 32 should be set opposite to each other; that is, they should be set on the inner or outer side at the same time to form an effective blockage of the cable reel; when both sides are set to have baffles 321, the clamping space of the V-shaped placement groove should be ensured.

[0054] Furthermore, corresponding to the single movement of two cable reels: a cable reel placement block 32 is provided at each end of the drag beam 31; thus, a cable placement position is formed at each end of the cable reel positioning and placement device 3.

[0055] like Figure 1 As shown, the two cable reels are located at both ends, making the force applied during movement more stable.

[0056] like Figure 21 As shown, the following explanation uses a four-set reel positioning device (two drag beams in each set) as an example.

[0057] A 72-link chain is used as the main transmission component, connected to the reel positioning device. The entire chain is divided into four segments, each with 18 links. Based on the workpiece's structural dimensions, eight links in each segment serve as the tooling connection area, while the remaining ten links act as the spacing area. This ensures a fixed distance for each movement, achieving step-by-step conveying.

[0058] This device enables vertical storage silo feeding and discharging operations.

[0059] Automated storage and retrieval system (AS / RS) feeding: A double-bar forklift picks up two cable reels at a time from a designated location; after reaching the set location, it places the cable reels on a cable reel stepping conveyor; the cable reel stepping conveyor moves and transports the cable reels to the set location and then stops. The automated storage and retrieval system (AS / RS) picking device then removes the two cable reels in sequence and moves them to the set location for storage.

[0060] Automated Warehouse Unloading: The automated warehouse material handling device sequentially removes two cable reels from the automated warehouse and places them on a cable reel stepping conveyor. The cable reel stepping conveyor moves and transports the cable reels to the set position and then stops. A double-bar forklift then picks up two cable reels at a time and transports them out of the automated warehouse for subsequent operations.

[0061] In some embodiments, the trailing beam 31 includes: The middle part is a U-shaped curved beam 311, and the end crossbeams 312 are integrally set at both ends of the U-shaped curved beam 311.

[0062] Understandably, setting the middle section to bend downwards makes the structure's center of gravity more stable.

[0063] Correspondingly, the coil placement block 32 is fixed above the end crossbeam 312.

[0064] Furthermore, the U-shaped curved beam 311 is made of square tube profile, and the end crossbeam 312 is made of square tube profile with the lower wall cut and retained (preferably retaining the rounded corner transition part to form a side stop).

[0065] Furthermore, a sealing plate is welded to the inner end of the end beam 312 to seal the inner cavity of the square tube profile; a pad 313 is placed inside the end beam 312 to form a planar assembly position; the installation accuracy is better and more reliable.

[0066] like Figure 18 , 19 As shown, recessed mounting positions are formed at both ends; when the coil placement block 32 is installed, its inner end touches the top, making the installation more stable and the stress state better.

[0067] In some embodiments, a directional wheel 4 is provided below the drag beam 31; a longitudinal pad beam 5 is fixedly provided on the inner side of the bracket 1 corresponding to the directional wheel 4.

[0068] like Figure 3 , 5 As shown in Figure 8, when the drag beam 31 is on top, the directional wheel 4 presses on the longitudinal pad beam 5; its lower end forms a support, reducing the pressure on the conveyor chain 2, ensuring smooth operation and reliable load-bearing capacity.

[0069] Furthermore, the area below the spool placement block 32 is misaligned with the installation position of the directional wheel 4 to form a groove area 322.

[0070] Understandably, the directional wheel 4 needs to be bolted to the bottom of the end beam 312; to ensure reliable connection and ease of operation, the bolts are generally installed from bottom to top, penetrating the end beam 312 and the pad 313 before the nut is installed; at the same time, the position of the coil placement block 32 needs to be adjusted during installation; therefore, a groove area 322 is provided below the coil placement block 32; as Figure 4 , 15 As shown in Figure 16, it avoids the bolts of the directional wheel 4 and can be moved and adjusted.

[0071] Furthermore, countersunk holes are provided on the coil placement block 32 for mounting bolts; such as Figure 19 As shown, strip holes are provided on the end beam 312 and the pad 313 to facilitate adjustment and assembly.

[0072] In some embodiments, the conveyor chain 2 is integrally provided with a bent assembly piece 20 corresponding to the chain plate of the reel positioning and placement device 3, and is bolted and fixed to the reel positioning and placement device 3.

[0073] like Figure 4 , 11 As shown in Figure 17, the bent assembly piece 20 is fixedly assembled onto the drag beam 31 from the lower end.

[0074] In some embodiments, one end of the conveyor chain 2 is fitted with a drive wheel 21, and the other end is fitted with a driven wheel 22; the drive wheels 21 and driven wheels 22 of the two conveyor chains 2 are connected by a synchronous shaft 23; the driven wheel 22 is fitted with a tension adjustment component 6.

[0075] The tension adjustment assembly 6 includes: an outer open box 61, guide plates 62 mounted inside the upper and lower ends of the outer open box 61, and a traction block 63 slidably mounted between the two guide plates 62; the traction block 63 is equipped with a bearing for cooperating with the driven wheel 22; one end of the traction block 63 is adjusted by a long screw 64 in cooperation with a nut.

[0076] like Figure 7 , 12 As shown in ~14; the outer opening box 61 forms a C-shaped space with the opening facing outward; end plates 65 are fixedly connected to both sides of the outer opening box 61 to form end seals; two guide plates 62 are fixed inside the outer opening box 61 by bolts, welding, etc. to form a guide structure; the upper and lower grooves of the pulling block 63 are used to fit the guide plates 62; the right side of the pulling block 63 forms an assembly space for inserting the long screw 64 and assembling the nut; the long screw 64 penetrates to the outside and is adjusted by the nut.

[0077] In some embodiments, a slotted switch 7 is installed inside the bracket 1, and a trigger plate 71 is correspondingly provided at the lower end of the coil positioning and placement device 3.

[0078] like Figures 3-6 As shown in Figures 8 and 9; the trigger plate 71 moves with the coil positioning and placement device 3, triggering the slotted switch 7; wherein, multiple slotted switches 7 and trigger plates 71 can be correspondingly configured; for example... Figure 5 As shown, two slotted switches 7 are provided, and a trigger plate 71 is assembled at the lower end of the corresponding online plate positioning device 3; preferably, the two slotted switches 7 are staggered to form different triggering time periods, which can further improve the control accuracy.

[0079] like Figure 16 , 18 As shown; the trigger plate 71 is a 90-degree folding plate, which can reuse the assembly bolts of the coil holding block 32; a strip hole is opened on the trigger plate 71 for easy adjustment.

[0080] In some embodiments, the support 1 consists of: a support leg 11 and a cross brace 12; the top of the support leg 11 extends inward to be fitted with an L-shaped connecting plate 13; a frame beam 14 is fitted above the L-shaped connecting plate 13, and the conveyor chain 2 passes through the upper and lower parts of the frame beam 14.

[0081] Correspondingly, a crossbeam is assembled on the inner side of the frame beam 14; the longitudinal pad beam is fixed on the crossbeam; the overall structure is more stable.

[0082] In some embodiments, a chain pad 8 is mounted above the frame beam 14; the two ends of the chain pad 8 are provided with beveled guides; preferably, polyurethane pads are used.

[0083] This device, through a short-distance conveying design, enables the exchange of cable reels inside and outside the intelligent automated warehouse. The equipment can handle both the loading and unloading of cable reels; its main function is to prevent operators or other equipment from directly entering the warehouse, ensuring safety during cable reel exchanges.

[0084] Intelligent automated warehouse feeding: A dual-bar forklift picks up two cable reels at a time from a designated location; upon reaching the set location, a cable reel walking conveyor detects whether there are any cable reels on the reel positioning device to which they will be placed; if no cable reels are found, the cable reel is placed on the walking conveyor, which then detects whether all cable reels transported to the intelligent automated warehouse have been removed; once it detects that there are no more cable reels in the previous sequence, the walking conveyor activates, transporting the cable reel to the set location and stopping; the intelligent automated warehouse picking device then sequentially removes the two cable reels and transports them to the set location for storage.

[0085] The cable reel stepping conveyor uses a double-pitch chain drive with accessories (bent assembly piece 20). A drive unit and a driven unit are designed at both ends to provide power to the conveying system. The cable reel positioning and placement device is fixed to the chain accessory and moves with the chain. By calculating and designing the distance of each set of cable reel positioning and placement devices, one cycle consists of 4 step positions (expandable), enabling stepping conveying. Combined with detection, this achieves precise material transfer and positioning.

[0086] Material unloading from the intelligent automated warehouse: The intelligent automated warehouse picking device sequentially removes two cable reels from the intelligent automated warehouse; the cable reel stepping conveyor detects whether there are cable reels on the reel positioning device to which the cable reels are to be placed; if there are no cable reels, the cable reel is placed on the cable reel stepping conveyor; the cable reel stepping conveyor detects whether all the cable reels transported to the outside of the intelligent automated warehouse have been removed. After detecting that there are no more cable reels in the previous sequence, the cable reel stepping conveyor starts, transports the cable reel to the set position, and then stops; a double-bar forklift picks up two cable reels at a time and transports them out of the intelligent automated warehouse for subsequent operations.

[0087] For detecting the presence of cable reels, photoelectric sensors, distance sensors, etc., can be used. They can be installed in suitable locations to detect the cable reels without any special limitations. For example, a distance probe facing the cable reel can be installed on the longitudinal support beam.

[0088] In this invention, the outside of the automated warehouse and the warehouse itself are separated, and the two are connected by a cable reel stepping conveyor to achieve fully automated logistics. This avoids operators directly interacting with materials in the intelligent automated warehouse, reduces safety risks, and improves the on-site working environment. The cable reel stepping conveyor adopts a two-reel-per-step design, meaning that two reels can be conveyed in one step, doubling the work efficiency.

[0089] In this invention, a cable reel stepping conveyor is used for precise stepping conveying, which realizes the interaction of cable reels inside and outside the intelligent automated warehouse, improves production efficiency, greatly reduces production safety risks, and reduces the occurrence of safety accidents in the working environment; moreover, the structure is simple and mature and easy to maintain.

[0090] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0091] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0092] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A cable reel stepping conveyor, comprising a support frame (1), characterized in that, The support (1) extends inward to the automated warehouse and works in conjunction with the automatic forks; conveyor chains (2) are mounted on both sides of the support (1) to operate in the direction of entering and leaving the warehouse; the inner sides of the two conveyor chains (2) are equipped with synchronously moving reel positioning and placement devices (3); the reel positioning and placement devices (3) form a placement position where the reel axis is consistent with the conveying direction.

2. The cable reel stepping conveyor according to claim 1, characterized in that, The placement space above the bracket (1) along the conveying direction is not less than two reel placement positions.

3. The cable reel stepping conveyor according to claim 1, characterized in that, The cable reel positioning and placement device (3) forms a cable placement position at each of its two ends.

4. The cable reel stepping conveyor according to claim 1, characterized in that, The coil positioning and placement device (3) consists of a drag beam (31) and a coil placement block (32) mounted on the drag beam (31); each set of coil positioning and placement devices (3) is provided with two cooperating drag beams (31).

5. The cable reel stepping conveyor according to claim 4, characterized in that, The trailing beam (31) includes: a U-shaped curved beam (311) in the middle part, and end beams (312) integrally set at both ends of the U-shaped curved beam (311); the coil placement block (32) is fixedly mounted on the end beams (312).

6. The cable reel stepping conveyor according to claim 1, characterized in that, The conveyor chain (2) is integrally provided with a bent assembly piece (20) corresponding to the chain plate of the reel positioning and placement device (3), and is bolted and fixed to the reel positioning and placement device (3).

7. The cable reel stepping conveyor according to claim 1, characterized in that, One end of the conveyor chain (2) is fitted with a drive wheel (21), and the other end is fitted with a driven wheel (22); the driven wheel (22) is fitted with a tension adjustment component (6).

8. The cable reel stepping conveyor according to claim 7, characterized in that, The tension adjustment assembly (6) includes: an outer opening box (61), guide plates (62) assembled inside the upper and lower ends of the outer opening box (61), and a traction block (63) slidably assembled between the two guide plates (62); the traction block (63) is equipped with a bearing, and one end is adjusted by a long screw (64) in conjunction with a nut.

9. The cable reel stepping conveyor according to claim 1, characterized in that, A slotted switch (7) is installed on the inner side of the bracket (1), and a trigger plate (71) is correspondingly provided at the lower end of the coil positioning and placement device (3).

10. The cable reel stepping conveyor according to claim 1, characterized in that, The bracket (1) consists of: a support leg (11) and a cross brace (12); the top of the support leg (11) extends inward to be fitted with an L-shaped connecting plate (13); a frame beam (14) is fitted above the L-shaped connecting plate (13).

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