CN116960777B - Electric control cabinet - Google Patents

Abstract

The invention discloses an electric control cabinet, which relates to the technical field of electric control cabinets. It includes a main body of the electric control cabinet and a connecting shaft. The connecting shaft is installed at the front edge of the main body of the electric control cabinet. The outer surface of the connecting shaft is installed with There is a protective cover, and a positioning bolt is installed on the inner wall of the main body of the electric control cabinet. The present invention realizes the lifting and lowering of the installed connecting bracket by arranging the protection component and the classification component, and rotates the threaded shaft under the action of the handle, and adjusts the spacing of the connecting bracket by stretching, thereby making it easier for the staff to control the Electrical components of different sizes are installed in the cabinet to avoid the limited internal space, which will cause obstruction during installation and inconvenient installation. After installation, when the connecting bracket is raised and lowered by the threaded shaft, the gear plate installed on the front end of the support plate is slid up and down to a certain extent. function, and then the gear plate and the connecting gear are engaged and connected to realize the rotation of the installation shaft.

Description

An electrical control cabinet

Technical field

The invention relates to the technical field of electric control cabinets, specifically an electric control cabinet.

Background technique

The electric control cabinet is a combination of switching equipment, measuring instruments, protective appliances and auxiliary equipment assembled in a closed or semi-closed metal cabinet or on a screen according to electrical wiring requirements. Its layout should meet the requirements for normal operation of the power system, facilitate maintenance, and not endanger Control cabinets that are safe for people and surrounding equipment, including distribution cabinets, electrical control cabinets, etc., can connect or break circuits with the help of manual or automatic switches during normal operation. When there is a fault or abnormal operation, the protective appliance is used to cut off the circuit or alarm. The measuring instrument can display various parameters during operation, adjust certain electrical parameters, and prompt or signal deviations from normal working conditions. It is commonly used in various fields. The distribution board in the power generation, distribution and substation, and inside the electric control cabinet, is a simple distribution panel with sockets, switches, relays and other electrical components arranged on a piece of bakelite board.

When installing electrical components in the existing electric control cabinet, the electrical components need to be installed on the distribution board, and then the distribution board is installed inside the electric control cabinet for installation. However, when installing the distribution board, Installing the equipment through bolts requires professional tools to dismantle the distribution board during disassembly and maintenance, which is too cumbersome, and the electrical components are of different sizes, making it inconvenient for staff to install electrical components inside the distribution cabinet. The applicability of the product itself is poor, and it is easy to cause internal obstruction during the installation of electrical appliances, causing installation inconvenience. Moreover, the installed electrical components are easily exposed to the external environment and cannot be protected, causing dust to fall in. There is a risk of short circuit, so we provide an electrical control cabinet.

Contents of the invention

The purpose of the present invention is to solve the problem that when installing electrical components in an electric control cabinet, the electrical components need to be installed on the distribution board, and then the distribution board is installed inside the electric control cabinet for installation. However, during the distribution When installing electrical panels, the equipment is installed through bolts, which requires professional tools to dismantle the electrical panels during disassembly and maintenance. This is too cumbersome, and the electrical components are of different sizes. The staff are installing electrical appliances inside the electrical distribution cabinets. It is more inconvenient to install components, and the applicability of the product itself is poor. When installing electrical appliances, it is easy to cause internal obstruction, causing installation inconvenience. Moreover, the installation of transferred electrical components is easy to be exposed to the external environment and cannot be protected, resulting in easy to cause The falling of dust can cause dangerous problems of short circuit. An electric control cabinet is provided.

In order to achieve the above object, the present invention provides the following technical solution: an electric control cabinet, including an electric control cabinet main body and a connecting shaft. The connecting shaft is installed at the front edge of the electric control cabinet main body. The outer surface of the connecting shaft A protective cover is installed, a positioning bolt is installed on the inner wall of the main body of the electric control cabinet, a positioning hole is installed on the outer surface of the positioning bolt, a distribution board is installed at the end of the positioning hole, and the four ends of the distribution board A connecting mechanism is installed. The connecting mechanism includes a connecting plate. The connecting plate is installed inside the connecting mechanism. A connecting spring is installed on the inner upper end surface of the connecting plate. A snap bolt is installed on the inner side of the connecting spring. A connection hole is installed on the inner wall of the main body of the electric control cabinet. A classification mechanism is installed on the front end of the main body of the electric control cabinet. An installation mechanism is installed on the front end of the main body of the electric control cabinet at the lower end of the classification mechanism. The outer surface of the installation mechanism The layer is equipped with a protective mechanism.

The positioning bolts and positioning holes are provided to provide a certain limit when installing the distribution board inside the main body of the electric control cabinet, ensuring the stability during the installation of the distribution board and avoiding deviation. phenomenon, and then pull the clamping bolt to realize the contraction of the clamping bolt inside the connecting plate under the action of the connecting spring, and then move the distribution board through the engagement between the positioning bolt and the positioning hole, and then clamp the bolt and the connecting hole. The snap-in function realizes the installation of the distribution board, which is more convenient and avoids the tedious installation through bolts when disassembling. The classification mechanism is used to classify and assemble the internally connected cables. The installation mechanism It is used for the installation of electrical components, and the protective mechanism is used to protect the components.

As a further solution of the present invention: the classification mechanism includes a classification bracket, a chute is provided inside the classification bracket, a fixed plate is installed on the lower end surface of the chute, and a sliding rod is installed inside the fixed plate. A limit plate is installed on the outer surface of the sliding rod inside the chute, and a threaded rod is installed on the upper end of the limit plate.

The chute is used to insert the installed cables, and is used to separate the cables from each other when connecting the cables to avoid the risk of short circuit caused by mutual contact, and then realize the limit by rotating the threaded rod. The bit plate slides on the chute along the sliding rod on the inner wall of the fixed plate, which is used to fix the cables and avoid mutual contact.

As a further solution of the present invention: the installation mechanism includes a connecting bracket, an opening groove is provided on the upper end surface of the connecting bracket, a connecting groove is provided below the opening groove inside the connecting bracket, and the connecting groove is provided inside the connecting bracket. A slide plate is installed, and electrical components are installed on the front end of the slide plate.

An installation mechanism is provided for the installation of electrical components. The electrical components are inserted into the open slot through the sliding plate, and then slid on the connecting groove to install the electrical components through bolts.

As a further solution of the present invention: the protection mechanism includes a slide rail bracket, a threaded shaft is installed inside the slide rail bracket, a slider is installed on the outer surface of the threaded shaft, and a support is installed at the lower end of the slider. plate, a gear plate is installed on the front end surface of the support plate, a connecting gear is meshed and connected internally with the gear plate, a mounting shaft is installed inside the center of the connecting gear, and a protective plate is installed on the outer surface of the mounting shaft. The two ends of the installation shaft are located on the front end of the slide rail bracket and are equipped with installation plates.

The set threaded shaft rotates under the action of the handle to realize the lifting and lowering of the installed connecting bracket, and adjusts the spacing of the connecting bracket by stretching, thus making it convenient for the staff to install electrical components of different sizes in the control cabinet and avoid internal The limited space makes it difficult to install due to obstruction during installation, and after installation, when the connecting bracket is raised and lowered on the threaded shaft, the protection of the electrical components can be achieved.

As a further solution of the present invention: a locking mechanism is installed on the lower end of the classification bracket, the locking mechanism includes a locking rod, a locking block and a locking groove, and a locking rod is installed on the lower end of the limiting plate. , a locking block is installed on the inner wall of the locking rod, and the locking groove is opened on the side wall of the protective plate.

When the set locking rod slides through the limit plate, the locking block can be locked through the locking groove to ensure that after the limit plate clamps and limits the wire harness, it can be further locked through the locking mechanism. The protective plate is limited and engaged, while improving the stability of the wiring harness and the protective plate.

Compared with the prior art, the beneficial effects of the present invention are:

By setting up the protective components and classification components, and through the set threaded shaft rotating under the action of the handle, the installed connecting bracket can be lifted and lowered, and the distance between the connecting bracket can be adjusted by stretching, thus making it easier for the staff to install the control cabinet. Electrical components of different sizes are used to avoid the limited internal space, which may cause obstruction during installation and make installation inconvenient. After installation, when the connecting bracket is raised and lowered by the threaded shaft, the gear plate installed on the front end of the support plate is slid up and down to a certain extent. Then the gear plate and the connecting gear have a meshing connection function to realize the rotation of the installation shaft, realize the rotation opening and closing of the protective plate through the installation shaft on the installation plate, and realize the protection of the electrical components, and the chute is used for Insert the installed cables to separate the cables from each other when connecting the cables to avoid the risk of short circuit caused by mutual contact, and then rotate the threaded rod to realize the limit plate along the inner wall of the fixed plate The sliding rod on the cable slides on the chute to fix the cables and prevent them from contacting each other.

Description of the drawings

Figure 1 is a schematic structural diagram of the present invention;

Figure 2 is an enlarged view of the opening and closing structure of the protective cover of the present invention;

Figure 3 is a schematic diagram of the distribution board connection structure of the present invention;

Figure 4 is an enlarged structural view of the classification mechanism of the present invention;

Figure 5 is a schematic structural diagram of the classification mechanism of the present invention;

Figure 6 is a schematic structural diagram of the distribution board of the present invention;

Figure 7 is a schematic structural diagram of the installation mechanism of the present invention;

Figure 8 is a schematic structural diagram of the protective mechanism of the present invention;

Figure 9 is a schematic structural diagram of the locking rod of the present invention.

In the picture: 1. Main body of the electric control cabinet; 2. Connecting shaft; 3. Protective cover; 4. Positioning bolt; 5. Positioning hole; 6. Distribution board; 7. Connection mechanism; 701. Connection plate; 702. Clamp bolt ; 703. Connection spring; 704. Connection hole; 8. Classification mechanism; 801. Classification bracket; 802. Fixed plate; 803. Slide rod; 804. Chute; 805. Threaded rod; 806. Limit plate; 9. Protection Mechanism; 901, slide rail bracket; 902, threaded shaft; 903, slider; 904, support plate; 905, gear plate; 906, connecting gear; 907, installation shaft; 908, protective plate; 909, installation plate; 10. Installation mechanism; 1001, connecting bracket; 1002, open slot; 1003, connecting slot; 1004, slide plate; 1005, electrical components; 11, locking mechanism; 1101, locking rod; 1102, locking block; 1103, locking slot .

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limitations of the invention. Furthermore, the terms “first”, “second” and “third” are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection", "connection" and "setting" should be understood in a broad sense. For example, it can be a fixed connection or a fixed connection. It can be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis. The embodiments of the present invention will be described below based on the overall structure of the present invention.

Please refer to Figures 1-8. In an embodiment of the present invention, an electric control cabinet includes an electric control cabinet main body 1 and a connecting shaft 2. The connecting shaft 2 is installed at the front edge of the electric control cabinet main body 1. A protective cover 3 is installed on the outer surface of the connecting shaft 2, a positioning bolt 4 is installed on the inner wall of the main body 1 of the electric control cabinet, a positioning hole 5 is installed on the outer surface of the positioning bolt 4, and a positioning hole 5 is installed on the end of the positioning hole 5. Power distribution board 6. The four ends of the power distribution board 6 are equipped with connection mechanisms 7. The connection mechanism 7 includes a connection plate 701. The connection plate 701 is installed inside the connection mechanism 7. The connection plate 701 is installed inside the connection plate 701. A connecting spring 703 is installed on the upper end surface, a latch 702 is installed on the inner side of the connecting spring 703, a connecting hole 704 is installed on the inner wall of the main body 1 of the electric control cabinet, and a classification mechanism is installed on the front end surface of the main body 1 of the electric control cabinet. 8. The front end surface of the main body 1 of the electric control cabinet is located at the lower end of the classification mechanism 8, and an installation mechanism 10 is installed. The outer layer of the installation mechanism 10 is provided with a protective mechanism 9;

In this embodiment, positioning bolts 4 and positioning holes 5 are provided to provide a certain limiting effect when installing the distribution board 6 inside the main body 1 of the electric control cabinet, ensuring that the distribution board 6 is installed. To ensure stability during the installation work and avoid deflection, pull the clamping bolt 702 under the action of the connecting spring 703 to realize the contraction of the clamping bolt 702 inside the connecting plate 701, and then move the distribution board 6 through the positioning bolt. 4 and the positioning hole 5 are engaged, the clamping bolt 702 and the connecting hole 704 are engaged to realize the installation of the distribution board 6, which is more convenient and avoids the need to install through bolts during disassembly. The classification mechanism 8 is used to classify and assemble the internally connected cables, the installation mechanism 10 is used to install electrical components, and the protection mechanism 9 is used to protect the components;

Wherein, the sliding plate 1004 has an "H" shape structure.

Specifically, the sliding plate 1004 has an "H"-shaped structure, which is used to engage the electrical device 1005 inside the connecting groove 1003 through the sliding plate 1004, thereby preventing the sliding plate 1004 from falling off the connecting bracket 1001 due to long-term use of the bolts, and improving assembly efficiency. Safety during installation of electrical panel 6.

It should be noted that the "H"-shaped structure is used for sliding on the connecting groove 1003, which can avoid falling off during sliding and improve the stability when installing electrical components.

It should be noted that the protective plate 908 has an "L" shape structure.

The protective plate 908 with an "L" shape is provided to better wrap the top of the connecting bracket 1001, thereby providing better protection.

It should be noted that the chute 804 is evenly distributed along the upper end surface of the classification bracket 801, and the limiting plate 806 is in an "L" shape.

The provided chute 804 is used to pass through the cables inside the main body 1 of the electrical control cabinet during installation, perform classified installation, and separate each other.

Referring to Figures 6 and 8, in a preferred embodiment, the protection mechanism 9 includes a slide rail bracket 901, a threaded shaft 902 is installed inside the slide rail bracket 901, and a threaded shaft 902 is installed on the outer surface of the slide rail bracket 901. Slider 903. A support plate 904 is installed at the lower end of the slider 903. A gear plate 905 is installed on the front end of the support plate 904. A connecting gear 906 is meshed with the inside of the gear plate 905. The connecting gear 906 A mounting shaft 907 is installed inside the center, a protective plate 908 is installed on the outer surface of the installation shaft 907, and a mounting plate 909 is installed on both ends of the installation shaft 907 at the front end of the slide rail bracket 901.

Specifically, the threaded shaft 902 rotates under the action of the handle to realize the lifting and lowering of the installed connecting bracket 1001, and adjusts the spacing of the connecting bracket 1001 by stretching, thereby making it easier for workers to install control cabinets of different sizes. electrical components to avoid the limited internal space, which will cause obstruction during installation and inconvenient installation. After installation, when the connecting bracket 1001 is used to lift the threaded shaft 902, the slider 903 can be lifted and lowered on the slide rail bracket 901 to a certain extent. , and then the gear plate 905 installed on the front end of the support plate 904 performs a certain up and down sliding action, and then the gear plate 905 and the connecting gear 906 are engaged and connected to realize the rotation of the installation shaft 907, and realize the protection plate 908 through the installation plate. The mounting shaft 907 on 909 realizes the function of rotating opening and closing, and protects the electrical device 1005.

In actual usage scenarios, a protective plate 908 with an "L" shape is provided to better wrap the top of the connecting bracket 1001, thereby providing better protection and effectively protecting the internal components to a certain extent. effect.

In the above solution, the lifting function of the threaded shaft 902 is used to realize the rotation of the protective plate 908 to protect the components. When the component cables are confused with each other during installation, it is easy to cause difficulty in maintenance, and the cables need to be separated from each other. Specifically Here's how it works:

Referring to Figure 5, the classification mechanism 8 includes a classification bracket 801. A chute 804 is provided inside the classification bracket 801. A fixing plate 802 is installed on the lower end surface of the chute 804. A fixing plate 802 is installed inside the fixing plate 802. Slide rod 803, the outer surface of the slide rod 803 is located inside the chute 804 and a limit plate 806 is installed, and a threaded rod 805 is installed on the upper end of the limit plate 806.

Specifically, the chute 804 provided is used to insert the installed cables, and is used to separate the cables from each other when connecting the cables to avoid the risk of short circuit caused by mutual contact, and then rotates The threaded rod 805 enables the limiting plate 806 to slide on the chute 804 along the sliding rod 803 on the inner wall of the fixed plate 802, and is used to fix the cables and avoid mutual contact.

Referring to Figures 6 and 9, in the above embodiment, it is further supplemented that a locking mechanism 11 is installed on the lower end of the classification bracket 801. The locking mechanism 11 includes a locking rod 1101, a locking block 1102 and a locking groove 1103. A locking rod 1101 is installed on the lower end of the limiting plate 806, a locking block 1102 is installed on the inner wall of the locking rod 1101, and a locking groove 1103 is opened on the side wall of the protective plate 908.

When the provided locking rod 1101 slides through the limiting plate 806, the locking block 1102 on the inner wall of the locking rod 1101 snaps into the locking groove 1103 on the side wall of the protective plate 908, ensuring that the limiting plate 806 is in the process of tightening the wire harness. After clamping and limiting, the protective plate 908 can be further limited and engaged through the locking mechanism 11 , thereby improving the stability of the wire harness and the protective plate 908 .

Supplementary explanations include: the upper end of the locking rod 1101 can be detached from the lower end of the limiting plate 806 to facilitate subsequent replacement and maintenance.

Referring to Figure 7, in a preferred embodiment, the installation mechanism 10 includes a connecting bracket 1001. The upper end surface of the connecting bracket 1001 is provided with an opening slot 1002. The lower part of the opening slot 1002 is located inside the connecting bracket 1001. There is a connecting groove 1003, a sliding plate 1004 is installed inside the connecting groove 1003, and an electrical device 1005 is installed at the front end of the sliding plate 1004.

Among them, the installation mechanism 10 is provided to install the electrical device 1005. The electrical device 1005 is inserted into the open slot 1002 through the sliding plate 1004, and then slides on the connecting slot 1003. The electrical device 1005 is installed through bolts. .

working principle:

When the equipment is in use, the positioning bolts 4 and the positioning holes 5 are provided to provide a certain limiting effect when installing the distribution board 6 inside the main body 1 of the electric control cabinet to ensure that the distribution board 6 is installed. To ensure stability during the installation work and avoid deflection, pull the clamping bolt 702 under the action of the connecting spring 703 to realize the contraction of the clamping bolt 702 inside the connecting plate 701, and then move the distribution board 6 through the positioning bolt. 4 and the positioning hole 5 are engaged, the clamping bolt 702 and the connecting hole 704 are engaged to realize the installation of the distribution board 6, which is more convenient. The threaded shaft 902 is provided under the action of the handle. Carry out rotation work to realize the lifting effect of the installed connecting bracket 1001, and stretch to adjust the spacing of the connecting bracket 1001, so that the staff can easily install electrical components of different sizes in the control cabinet, and avoid the limited internal space, resulting in obstruction during installation. It is not convenient to install, and after installation, when the connecting bracket 1001 is raised and lowered by the threaded shaft 902, the gear plate 905 installed on the front end of the support plate 904 is slid up and down to a certain extent, and then the gear plate 905 and the connecting gear 906 are engaged and connected. , to realize the rotation of the installation shaft 907, to realize the rotation opening and closing of the protective plate 908 through the installation shaft 907 on the installation plate 909, to realize the protection of the electrical device 1005, and the chute 804 is used to protect the installed wires. The cables are inserted to separate the cables from each other when connecting the cables to avoid the risk of short circuit caused by mutual contact, and then by rotating the threaded rod 805, the limiting plate 806 is moved along the inner wall of the fixed plate 802 The sliding rod 803 slides on the chute 804, which is used to fix the cables and avoid mutual contact. The installation mechanism 10 is provided to install the electrical device 1005, and the electrical device 1005 is installed in the opening through the sliding plate 1004. The slot 1002 is inserted and then slid on the connecting slot 1003 to install the electrical device 1005 through bolts.

The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person familiar with the technical field can, within the technical scope disclosed in the present invention, use the technology of the present invention. Any equivalent substitution or change of the scheme and its inventive concept shall be covered by the protection scope of the present invention.

Claims (6)

1. The electric control cabinet is characterized by comprising an electric control cabinet main body (1) and a connecting shaft (2), wherein the connecting shaft (2) is arranged at the edge of the front end face of the electric control cabinet main body (1), a protective cover (3) is arranged on the outer surface of the connecting shaft (2), a positioning bolt (4) is arranged on the inner wall of the electric control cabinet main body (1), a positioning hole (5) is arranged on the outer surface of the positioning bolt (4), a distribution board (6) is arranged at the tail end of the positioning hole (5), and a connecting mechanism (7) is arranged at the four ends of the distribution board (6);

the connecting mechanism (7) comprises a connecting plate (701), the connecting plate (701) is arranged in the connecting mechanism (7), a connecting spring (703) is arranged on the upper end surface in the connecting plate (701), a clamping bolt (702) is arranged on the inner side of the connecting spring (703), and a connecting hole (704) is arranged on the inner side wall of the electric control cabinet main body (1);

the front end face of the electric control cabinet main body (1) is provided with a classification mechanism (8);

the front end face of the electric control cabinet main body (1) is positioned at the lower end of the classification mechanism (8) and is provided with a mounting mechanism (10);

the outer layer of the mounting mechanism (10) is provided with a protection mechanism (9);

the mounting mechanism (10) comprises a connecting bracket (1001), an opening groove (1002) is formed in the upper end face of the connecting bracket (1001), a connecting groove (1003) is formed in the connecting bracket (1001) below the opening groove (1002), a sliding plate (1004) is mounted in the connecting groove (1003), and an electric device (1005) is mounted at the front end of the sliding plate (1004);

the protection mechanism (9) comprises a sliding rail support (901), a threaded shaft (902) is arranged in the sliding rail support (901), a sliding block (903) is arranged on the outer surface of the threaded shaft (902), a supporting plate (904) is arranged at the lower end of the sliding block (903), a gear plate (905) is arranged on the front end face of the supporting plate (904), a connecting gear (906) is connected with the inner meshing of the gear plate (905), a mounting shaft (907) is arranged in the center of the connecting gear (906), a protection plate (908) is arranged on the outer surface of the mounting shaft (907), and mounting plates (909) are arranged on the front end face of the sliding rail support (901) at two ends of the mounting shaft (907);

the sorting mechanism (8) comprises a sorting bracket (801), a chute (804) is formed in the sorting bracket (801), a fixed plate (802) is arranged on the lower end face of the chute (804), a sliding rod (803) is arranged in the fixed plate (802), a limiting plate (806) is arranged on the outer surface of the sliding rod (803) in the chute (804), and a threaded rod (805) is arranged at the upper end of the limiting plate (806);

the locking mechanism (11) is installed to the lower extreme of categorised support (801), locking mechanism (11) are including locking lever (1101), latch segment (1102) and locking groove (1103), locking lever (1101) is installed to the lower extreme of limiting plate (806), latch segment (1102) is installed to the inner wall of locking lever (1101), side wall in guard plate (908) is seted up in locking groove (1103).

2. An electric control cabinet according to claim 1, characterized in that the positioning holes (5) are in a hole-shaped structure, the positioning holes (5) are arranged in four groups, and the four groups of positioning holes (5) are distributed in a matrix along the rear end face of the distribution board (6).

3. An electric control cabinet according to claim 1, characterized in that the connection means (7) are arranged in four groups, the four groups of connection means (7) being distributed in a matrix along the four ends of the front face of the distribution board (6).

4. An electric control cabinet according to claim 1, characterized in that the slide plate (1004) has an "H" shaped structure.

5. An electric control cabinet according to claim 1, characterized in that the protection plate (908) has an "L" -shaped structure.

6. An electric control cabinet according to claim 1, characterized in that the sliding grooves (804) are uniformly distributed along the upper end surface of the classifying bracket (801), and the limiting plate (806) is in an L-shaped structure.