Folding grid supermarket shopping basket

Abstract

The utility model discloses a folding type grid supermarket shopping basket. Belongs to the technical field of shopping baskets. According to the technical key points, the device comprises a rear grid plate, a telescopic handle is arranged on one side of the rear grid plate, inner folding side plates are hinged to the two sides of the rear grid plate, a front grid plate is jointly hinged to the other sides of the two inner folding side plates, and a supporting bottom plate is hinged to the near end of the bottom end of the side, facing the front grid plate, of the rear grid plate; and when the supporting bottom plate rotates to be in a horizontal state, the movable end of the supporting bottom plate is erected on one side of the front grid plate, and fixing clamping shells are clamped to the tops of the two inner folding side plates correspondingly. According to the foldable shopping basket, the rear grid plate, the front grid plate, the supporting bottom plate, the inner folding side plates, the fixing clamping shells and the lock catch assemblies are arranged and used in cooperation, when the shopping basket is transported, carried or stored, the shopping basket can be folded, and the folded shopping basket is small in occupied space, convenient to carry and store and high in practicability.

Description

Technical Field

[0001] This utility model relates to the field of shopping basket technology, specifically a foldable mesh supermarket shopping basket. Background Technology

[0002] As people's living standards improve, the impact on the environment is also increasing. At the same time, people are paying more and more attention to environmental protection. When shopping in markets, salespeople provide plastic bags, but due to the materials and manufacturing processes, these plastic bags are non-biodegradable and easily damaged, forming persistent white pollution that causes serious environmental damage. Currently, plastic bags are still disposed of through incineration and landfill. The waste released from incineration poses a significant threat to human health, and the plastic bags remaining in the ground after landfilling will not decompose for a long time. Previously, plastic bags were provided free of charge, so people used them without any concerns. Considering these issues, the use of reusable bags has been promoted to gradually reduce the use of plastic bags. Even when using plastic bags, biodegradable ones are preferred, and a usage fee is charged. This has led to the increasing popularity of reusable bags. Reusable bags are reusable, but current reusable bags lack support frames. While they are convenient to fold, they cannot support themselves, causing items to be squeezed together when filled. Therefore, shopping baskets are often used instead.

[0003] Currently, shopping baskets used in supermarkets, shopping malls, or homes are generally made of plastic or wire. Their structure mainly includes a handle and a basket body. The basket body generally includes a basket opening frame and a basket body. The basket body is generally fixedly connected to the basket opening frame or integrally formed, that is, the basket opening frame and the basket body are generally an integral structure and cannot be folded. Therefore, existing shopping baskets take up a lot of space and are inconvenient to store and put away. At the same time, existing shopping baskets are also very inconvenient to transport or carry. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a foldable mesh supermarket shopping basket. This technical solution addresses the issue raised in the background art that shopping baskets currently used in supermarkets, shopping malls, or homes are generally made of plastic or iron wire. Their structure mainly includes a handle and a basket body. The basket body generally includes a basket opening frame and a basket body. The basket body is generally fixedly connected to the basket opening frame or integrally formed, that is, the basket opening frame and the basket body are generally an integral structure and cannot be folded. Therefore, existing shopping baskets occupy a lot of space and are inconvenient to store. At the same time, existing shopping baskets are also inconvenient to transport or carry.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A foldable mesh supermarket shopping basket includes a rear mesh panel with a telescopic handle on one side. Both sides of the rear mesh panel are hinged with inward-folding side panels, and the other side of both inward-folding side panels is hinged to a front mesh panel. A support base plate is hinged to the bottom near the front mesh panel on the side of the rear mesh panel facing the front mesh panel. When the support base plate rotates to a horizontal position, its movable end rests on one side of the front mesh panel. The tops of both inward-folding side panels are fitted with fixing clips. Universal wheels are installed on both the bottom sides of the rear and front mesh panels. A locking assembly is also provided between the rear and front mesh panels.

[0007] Preferably, a hook is fixedly connected to the top end near the outer side of the rear mesh plate.

[0008] Preferably, both sides of the rear grid plate are rotatably connected to stair-climbing triangular wheels near the bottom.

[0009] Preferably, the telescopic handle includes two square sleeve rods fixedly connected to one side of the rear grid plate. A square inner rod is inserted into each of the two square sleeve rods. A connecting plate is fixedly connected between the two square sleeve rods near their top positions. A handle is fixedly connected to the top of both square inner rods. Sliding cavities are formed on both sides of the connecting plate, communicating with the inner cavities of the square sleeve rods. Limiting rods are slidably connected within each of the two sliding cavities. A spring is also provided within each sliding cavity. Pressing plates are fixedly connected to the ends of the two limiting rods that are close to each other. Two through slots communicating with the two sliding cavities are formed on the side of the connecting plate away from the rear grid plate. The two pressing plates move laterally within the two through slots. Several limiting slots adapted to the limiting rods are formed on the opposite sides of the two square inner rods.

[0010] Preferably, the inner folding side panel includes two mesh side panels hinged together. One end of one mesh side panel is hinged to one side of the rear mesh panel, and one end of the other mesh side panel is hinged to one side of the front mesh panel. The hinge point of the two mesh side panels is located on the outer side of the opposite side of the two mesh side panels. A limiting component is provided on the inner side of the opposite side of the two mesh side panels. The limiting component includes a limiting groove formed on one side of one mesh side panel, and a limiting block adapted to the limiting groove is fixedly connected to one side of the other mesh side panel. When the two mesh side panels are in a straight line, the limiting block will abut against the limiting groove. The fixing clip is engaged at the top of the two mesh side panels that are in a straight line.

[0011] Preferably, the bottom of the supporting base plate is provided with a honeycomb structure, and the end of the supporting base plate away from the hinge is provided with a notch.

[0012] Preferably, an elastic hook is fixedly connected to the outer side of the fixed housing, and a set of slots adapted to the elastic hook is opened on the outer side of the rear grid plate. The set of slots includes a sliding groove for the elastic hook to pass through and a hook groove for the elastic hook to hook.

[0013] Preferably, the locking assembly includes two elastic latches rotatably connected to both sides of the rear mesh plate, and locking grooves adapted to the two elastic latches are provided on both sides of the front mesh plate at corresponding positions, and locking blocks for locking the elastic latches are provided in the locking grooves.

[0014] Compared with the prior art, this utility model provides a foldable mesh supermarket shopping basket, which has the following beneficial effects:

[0015] 1. This utility model utilizes a combination of a rear grid plate, a front grid plate, a supporting base plate, inner folding side plates, fixing clips, and a locking assembly. When transporting or storing the shopping basket, first remove the two fixing clips, then rotate the supporting base plate upwards. After folding, the supporting base plate will fit snugly inside the rear grid plate. Next, fold the inner folding side plates inwards along the hinge joint of the two grid side plates, making them fold together. The two inner folding side plates must be folded inwards simultaneously. During the folding process, the two inner folding side plates will bring the rear and front grid plates closer together. When the two inner folding side plates are fully folded together, the rear grid plate will fit snugly against the front grid plate. The folded inner folding side plates will then be stored in the slot formed between the rear and front grid plates. The locking assembly then secures the rear and front grid plates together, allowing for easy transport and storage. The folded shopping basket occupies little space, is easy to carry and store, and is highly practical.

[0016] 2. By setting a telescopic handle, this utility model allows the height of the shopping basket to be adjusted according to the height of different users, making it widely applicable and improving user comfort. At the same time, the telescopic handle can be retracted to its lowest position when the shopping basket is folded for carrying, further reducing the space occupied and further meeting the needs of users. It has substantial improvements and is conducive to its widespread use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0018] Figure 2 In this utility model Figure 1 A magnified structural diagram at point A;

[0019] Figure 3 This is a schematic diagram of the telescopic handle in this utility model;

[0020] Figure 4This is a cross-sectional view of the telescopic handle in this utility model;

[0021] Figure 5 This is a cross-sectional view of the telescopic handle in this utility model from another perspective;

[0022] Figure 6 This is a schematic diagram of the structure in this utility model in which one end of the supporting base plate is erected on one side of the front grid plate;

[0023] Figure 7 This is a schematic diagram of the structure of the supporting base plate when it is opened in this utility model;

[0024] Figure 8 This is a schematic diagram of the structure of the supporting base plate folded up in this utility model;

[0025] Figure 9 This is a schematic diagram of the locking assembly in use according to this utility model;

[0026] Figure 10 This is a schematic diagram of the structure of the fixing clip in this utility model.

[0027] The following are the labels in the diagram: 1. Rear mesh plate; 2. Telescopic handle; 201. Square sleeve rod; 202. Square inner rod; 203. Connecting plate; 204. Grip; 205. Slide cavity; 206. Limiting rod; 207. Spring; 208. Pressing plate; 209. Limiting slot; 3. Inner folding side plate; 301. Mesh side plate; 302. Limiting groove; 303. Limiting stop block; 4. Front mesh plate; 5. Support base plate; 6. Fixing clip; 7. Universal wheel; 8. Locking assembly; 801. Elastic lock; 802. Lock groove; 9. Hook; 10. Stair climbing triangular wheel; 11. Honeycomb structure; 12. Notch; 13. Elastic hook; 14. Slide groove; 15. Hook groove. Detailed Implementation

[0028] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0029] Example 1

[0030] Please refer to Figures 1 to 10As shown, a foldable mesh supermarket shopping basket includes a rear mesh panel 1, a telescopic handle 2 on one side of the rear mesh panel 1, inner folding side panels 3 hinged to both sides of the rear mesh panel 1, and a front mesh panel 4 hinged to the other side of the two inner folding side panels 3. A support base plate 5 is hinged to the bottom near the end of the side of the rear mesh panel 1 facing the front mesh panel 4. When the support base plate 5 is rotated to a horizontal state, the movable end of the support base plate 5 will rest on the side of the front mesh panel 4. A fixing clip 6 is installed on the top of the two inner folding side panels 3. Universal wheels 7 are installed on both sides of the bottom of the rear mesh panel 1 and the front mesh panel 4. A locking assembly 8 is also provided between the rear mesh panel 1 and the front mesh panel 4.

[0031] Those skilled in the art will understand that when transporting, carrying, or storing the shopping basket, the two fixing clips 6 are first removed, and then the support base plate 5 is rotated upwards and folded. After the support base plate 5 is rotated and folded, it will fit snugly inside the rear grid plate 1. Then, the inner folding side plate 3 is folded inwards along the hinge of the two grid side plates 301, so that the two grid side plates 301 are folded together. The two grid side plates 301 need to be folded inwards simultaneously. During the folding process, the two grid side plates 301 will cause the rear grid plate 1 and the front grid plate 4 to move closer to each other. When the two grid side plates 301 are completely folded together, the rear grid plate 1 will fit snugly against the front grid plate 4, and the folded grid side plate 301 will be stored in the slot between the rear grid plate 1 and the front grid plate 4. Then, the rear grid plate 1 and the front grid plate 4 are fixed together by the locking assembly 8, and then it can be carried and transported. The folded shopping basket occupies little space, is easy to carry and store, and is highly practical.

[0032] In addition, slots are provided on opposite sides of the rear grid plate 1 and the front grid plate 4 for storing and unfolding the folded support base plate 5 and the inner folding side plate 3. When the support base plate 5 is rotated and opened to a horizontal state, its movable end is placed in the groove on one side of the front grid plate 4. The setting of the fixing clip 6 can make the inner folding side plate 3 more stable when unfolded.

[0033] Furthermore, the two casters 7 at the bottom of the rear grid plate 1 are locking casters 7. Once locked, they can prevent the wheels from slipping and avoid the shopping basket from moving accidentally. They are especially suitable for slopes or uneven ground and can meet the needs of temporary fixation.

[0034] Example 2

[0035] Furthermore, a hook 9 is fixedly connected to the top end near the outer side of the rear mesh plate 1.

[0036] Those skilled in the art will understand that the present invention expands the temporary storage space by setting the hook 9, and can hang small goods or fragile items to avoid being squeezed and damaged by heavy objects in the basket.

[0037] In addition, you can hang eco-friendly bags or handbags to free up your hands for easy selection of goods and improve ease of use.

[0038] Example 3

[0039] Furthermore, both sides of the rear grid plate 1 are rotatably connected to stair-climbing triangular wheels 10 near the bottom.

[0040] Those skilled in the art will understand that the stair-climbing triangular wheel 10 of this utility model disperses pressure by having three small wheels alternately contact the steps, avoiding the risk of tipping over due to single-point force, and can maintain balance when the items in the shopping basket are heavy.

[0041] In addition, the three small wheels on one side can automatically adjust their angle to fit the edge of the step, reducing jamming and enabling continuous climbing.

[0042] Example 4

[0043] Furthermore, the telescopic handle 2 includes two square sleeve rods 201 fixedly connected to one side of the rear grid plate 1. A square inner rod 202 is inserted into each of the two square sleeve rods 201. A connecting plate 203 is fixedly connected between the two square sleeve rods 201 near their top positions. A handle 204 is fixedly connected to the top of both square inner rods 202. Sliding cavities 205 are formed on both sides of the connecting plate 203, communicating with the inner cavities of the square sleeve rods 201. Limiting rods 206 are slidably connected within each of the two sliding cavities 205. A spring 207 is also provided within each sliding cavity 205. Pressing plates 208 are fixedly connected to the ends of the two limiting rods 206 that are close to each other. Two through slots communicating with the two sliding cavities 205 are formed on the side of the connecting plate 203 away from the rear grid plate 1. The two pressing plates 208 move laterally within the two through slots. Several limiting slots 209, adapted to the limiting rods 206, are formed on the opposite sides of the two square inner rods 202.

[0044] As will be understood by those skilled in the art, when adjusting the telescopic handle 2 of this utility model, by pressing the two pressing plates 208 relative to each other, the two limiting rods 206 are simultaneously retracted into the two sliding cavities 205 (the spring 207 will be compressed). Then, by pulling the two square inner rods 202 upwards through the handle 204, the square inner rods 202 are pulled out to the appropriate length. Then, the two pressing plates 208 are released, the spring 207 returns to its original state and pushes the limiting rods 206 outwards, causing one end of the limiting rod 206 to move out of the sliding cavity 205. If the limiting rod 206 is not aligned with any of the limiting slots 209, one end of the limiting rod 206 will abut against the outside of the square inner rod 202. At this time, the square inner rod 202 can be moved slightly upwards or downwards again to align the limiting rod 206 with the nearest limiting slot 209. Then, the limiting rod 206 will be inserted into the limiting slot 209, thereby fixing the square inner rod 202 and completing the adjustment of the telescopic handle 2.

[0045] In addition, when transporting and carrying the shopping basket, the limiting rod 206 can be inserted into the top limiting slot 209, so that the square inner rod 202 will be completely retracted into the square sleeve rod 201, further reducing the space ratio of the shopping basket after folding, making it easier to carry or store.

[0046] Example 5

[0047] Furthermore, the inner folding side panel 3 includes two mesh side panels 301 hinged together. One end of one mesh side panel 301 is hinged to one side of the rear mesh panel 1, and one end of the other mesh side panel 301 is hinged to one side of the front mesh panel 4. The hinge point of the two mesh side panels 301 is located on the outer side of the two mesh side panels 301. A limiting component is provided on the inner side of the two mesh side panels 301. The limiting component includes a limiting groove 302 opened on one side of one mesh side panel 301, and a limiting block 303 adapted to the limiting groove 302 is fixedly connected to one side of the other mesh side panel 301. When the two mesh side panels 301 are in a straight line, the limiting block 303 will abut against the limiting groove 302. The fixing clip 6 is locked on the top of the two mesh side panels 301 that are in a straight line.

[0048] Those skilled in the art will understand that when the inner folding side plate 3 of this utility model is folded, the inner folding side plate 3 is folded inward along the hinge of the two mesh side plates 301, so that the two mesh side plates 301 are folded and attached together.

[0049] In addition, by setting the limiting groove 302 and the limiting block 303, the inner folding side plate 3 can only be folded inward when folded. As a result, when the inner folding side plate 3 is unfolded and used, the structure is more stable through cooperation with the supporting base plate 5, so that the supporting base plate 5 can support the unfolded inner folding side plates 3 on both sides.

[0050] Example 6

[0051] Furthermore, the bottom of the support base plate 5 is provided with a honeycomb structure 11, and a notch 12 is opened at the end of the support base plate 5 away from the hinge.

[0052] Those skilled in the art will understand that by setting a honeycomb structure 11 at the bottom of the support base plate 5, the present invention can achieve the effect of uniformly dispersing pressure, significantly improving the compressive and bending resistance of the support base plate 5, making the support base plate 5 less prone to deformation, and at the same time, the honeycomb structure 11 can greatly reduce weight while maintaining a high-strength support effect.

[0053] In addition, the notch 12 makes it easy for users to hook one end of the support base plate 5 and rotate and fold the support base plate 5.

[0054] Example 7

[0055] Furthermore, an elastic hook 13 is fixedly connected to the outer side of the fixed housing 6, and a slot group adapted to the elastic hook 13 is opened on the outer side of the rear grid plate 1. The slot group includes a sliding groove 14 for the elastic hook 13 to pass through and a hook groove 15 for the elastic hook 13 to hook. The hook groove 15 is located below the sliding groove 14.

[0056] Those skilled in the art will understand that after the fixing clip 6 is removed, the elastic hook 13 of the fixing clip 6 can be inserted into the slide groove 14 of the clip group, and then the fixing clip 6 can be moved downward so that the elastic hook 13 slides downward in the slide groove 14. When the elastic hook 13 slides downward a certain distance in the slide groove 14, the bent part of the elastic hook 13 will be engaged in the hook groove 15 in the clip group, thereby fixing the fixing clip 6 and making it easy to store the fixing clip 6 after the shopping basket is folded.

[0057] In addition, each of the two fixing clips 6 is provided with two elastic hooks 13, and the rear grid plate 1 is provided with four slot groups. Each fixing clip 6 is secured by inserting the two elastic hooks 13 into the two slot groups.

[0058] Example 8

[0059] Furthermore, the locking assembly 8 includes two elastic latches 801 rotatably connected to both sides of the rear mesh plate 1. The front mesh plate 4 has corresponding locking grooves 802 that are adapted to the two elastic latches 801. The locking grooves 802 are provided with locking blocks for locking the elastic latches 801.

[0060] Those skilled in the art will understand that, in use, the locking assembly 8 of this utility model requires the rear mesh plate 1 to be attached to the front mesh plate 4, and then the two elastic latches 801 on the rear mesh plate 1 are rotated into the two locking grooves 802 on the front mesh plate 4, so that the elastic latches 801 hook the locking blocks in the locking grooves 802, thereby fixing the rear mesh plate 1 and the front mesh plate 4 together.

[0061] The working principle and usage procedure of this device are as follows: When transporting or storing the shopping basket, first remove the two fixing clips 6, insert the elastic hooks 13 of the fixing clips 6 into the sliding grooves 14 of the slot group on the rear grid plate 1, and then move the fixing clips 6 downwards so that the elastic hooks 13 slide downwards in the sliding grooves 14. When the elastic hooks 13 slide downwards in the sliding grooves 14 to a certain distance, the hooks of the elastic hooks 13 will engage with the hook grooves 15 in the slot group, thereby fixing the fixing clips 6. This makes it easy to store the fixing clips 6 after the shopping basket is folded to avoid loss. Then, rotate the folding support base plate 5 upwards. After the support base plate 5 is rotated and folded, it will fit snugly into the rear grid plate 1. Then, the inner folding side plate 3 is moved along the two grid side plates 3. The hinge of 01 is folded inward, so that the two mesh side plates 301 are folded and attached together. The two mesh side plates 301 need to be folded inward simultaneously. During the folding process, the two mesh side plates 301 will drive the rear mesh plate 1 and the front mesh plate 4 to move closer to each other. When the two mesh side plates 301 are completely folded together, the rear mesh plate 1 will be attached to the front mesh plate 4. The folded mesh side plate 301 will be put into the slot between the rear mesh plate 1 and the front mesh plate 4. Then, the two elastic buckles 801 on the rear mesh plate 1 are rotated into the two locking slots 802 on the front mesh plate 4 respectively, so that the elastic buckles 801 hook the locking blocks in the locking slots 802, thereby fixing the rear mesh plate 1 and the front mesh plate 4 together, and then it can be carried and transported.

[0062] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A foldable grid supermarket shopping basket comprising a rear grid panel (1), characterised in that, The rear grid plate (1) is provided with a telescopic handle (2) on one side, and the two sides of the rear grid plate (1) are hingedly connected with inner folding side plates (3), and the other sides of the two inner folding side plates (3) are hingedly connected with a front grid plate (4), and the bottom end of the side of the rear grid plate (1) close to the front grid plate (4) is hingedly connected with a supporting bottom plate (5), when the supporting bottom plate (5) is rotated to a horizontal state, the movable end of the supporting bottom plate (5) is arranged on one side of the front grid plate (4), the top of the two inner folding side plates (3) is clamped with a fixed clamping shell (6), the bottom of the rear grid plate (1) and the front grid plate (4) is provided with a universal wheel (7), and the rear grid plate (1) and the front grid plate (4) are further provided with a lock catch assembly (8).

2. A foldable grid supermarket shopping basket according to claim 1, wherein, The top end of the outer side of the rear grid plate (1) is fixedly connected with a hook (9).

3. The foldable grid supermarket shopping basket of claim 1, wherein, The two sides of the rear grid plate (1) close to the bottom are rotatably connected with a climbing triangular wheel (10).

4. The foldable grid supermarket shopping basket of claim 1, wherein, The telescopic handle (2) comprises two square sleeve rods (201) fixedly connected on one side of the rear grid plate (1), square inner rods (202) are inserted into the two square sleeve rods (201), a connecting plate (203) is fixedly connected between the two square sleeve rods (201) close to the top, a handle (204) is fixedly connected to the top ends of the two square inner rods (202), slide cavities (205) are formed in the two sides of the connecting plate (203), the slide cavities (205) are in communication with the inner cavities of the square sleeve rods (201), limit rods (206) are slidably connected in the two slide cavities (205), springs (207) are arranged in the slide cavities (205), press plates (208) are fixedly connected to the ends of the limit rods (206) close to each other, two through grooves are formed in the side of the connecting plate (203) away from the rear grid plate (1) and in communication with the two slide cavities (205), the two press plates (208) are respectively horizontally arranged in the two through grooves, and a plurality of limit insertion grooves (209) matched with the limit rods (206) are formed in the opposite sides of the two square inner rods (202).

5. The foldable grid supermarket shopping basket of claim 1, wherein, The inner folding side plate (3) comprises two grid side plates (301) hinged together, one end of one of the grid side plates (301) is hinged to one side of the rear grid plate (1), one end of the other grid side plate (301) is hinged to one side of the front grid plate (4), the hinge of the two grid side plates (301) is located at the outer side of the opposite sides of the two grid side plates (301), the inner side of the opposite sides of the two grid side plates (301) is provided with a limiting assembly, the limiting assembly comprises a limiting slot (302) opened in one side of one of the grid side plates (301), the other side of the other grid side plate (301) is fixedly connected with a limiting stop block (303) matched with the limiting slot (302), when the two grid side plates (301) are in a straight line, the limiting stop block (303) is arranged in the limiting slot (302), and the fixed clamping shell (6) is clamped on the top of the two grid side plates (301) in a straight line.

6. The foldable grid supermarket shopping basket of claim 1, wherein, The bottom of the support bottom plate (5) is provided with a honeycomb structure (11), and the end of the support bottom plate (5) away from the hinge is provided with an opening (12).

7. The foldable grid supermarket shopping basket of claim 1, wherein, The outer side of the fixed clamping shell (6) is fixedly connected with an elastic clamping hook (13), and the outer side of the rear grid plate (1) is provided with a clamping groove set matched with the elastic clamping hook (13), the clamping groove set comprises a sliding groove (14) for the elastic clamping hook (13) to pass through and a hook groove (15) for the elastic clamping hook (13) to hook.

8. The foldable mesh supermarket shopping basket according to claim 1, wherein, The lock catch assembly (8) comprises two elastic lock catches (801) rotatably connected on both sides of the rear grid plate (1), the two sides of the front grid plate (4) are provided with lock grooves (802) matched with the two elastic lock catches (801) at the corresponding positions, and the lock grooves (802) are provided with clamping blocks for clamping the elastic lock catches (801).

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