Continuous drilling device for electrical cabinet metal plate machining

Abstract

The invention relates to the technical field of electrical cabinet metal plate machining, and discloses a continuous drilling device for electrical cabinet metal plate machining, a continuous drilling mechanism is arranged on one side of a drilling table body, and fixing mechanisms capable of stacking multiple sets of electrical cabinet metal plates are arranged on the two sides of the drilling table body. The drilling table comprises a drilling table body, a fixing mechanism is arranged on the drilling table body, a pressing mechanism for pressing and covering a metal plate is arranged above the fixing mechanism, a groove structure is formed in the upper surface of the drilling table body, a supporting mechanism capable of transversely sliding is arranged in the groove structure, and a dust removal mechanism for supporting the drilling position of the plate is slidably arranged on the supporting mechanism. Through the fixing mechanism and the pressing mechanism, multiple sets of metal plates can be stacked and fixed, drilling positions of the metal plates can be supported through mutual cooperation of the supporting mechanism and the dust removal mechanism, the drilling effect is improved, and the center supporting mechanism can not only support the plates but also collect powder generated during drilling.

Description

Technical Field

[0001] The invention relates to the technical field of metal plate processing of electrical cabinets, in particular to a continuous drilling device for processing metal plates of electrical cabinets. Background Art

[0002] In the production of electrical cabinet enclosures, the role of drilling equipment is to drill holes in or through the enclosure. These holes can be used to install electrical equipment, electrical cables, and other related components to facilitate connection and assembly. Drilling equipment plays an important role in the production of electrical cabinet enclosures. It is used to create holes, provide ventilation, install wiring, and provide design flexibility. They ensure that electrical equipment and components can be installed and connected safely and effectively, thereby improving the functionality and reliability of the electrical cabinet.

[0003] After searching, the Chinese patent with publication number CN220902517U discloses a drilling and positioning device for copper busbars in electrical cabinets. The device uses a first drive motor to drive the drill bit to move horizontally on the plate, and then uses an electric push rod to move downward to drive the drill bit to drill. However, the following problems still exist:

[0004] 1. The efficiency of using a drive motor and an electric push rod to drive the drill bit is too slow, which greatly reduces the efficiency of drilling. In addition, the drill bit has no effective heat dissipation structure and is not suitable for continuous drilling scenarios.

[0005] 2. The manufacturer needs to drill holes in a batch of panels, but the fixing structure in the application cannot provide effective support for stacking multiple panels;

[0006] 3. Lack of effective dust removal structure, the metal powder generated by drilling will pollute the environment and endanger the health of workers. Summary of the Invention

[0007] Technical problems solved

[0008] In view of the shortcomings of the prior art, the present invention provides a continuous drilling device for processing metal plates of electrical cabinets, which is mainly used to solve the problem of low drilling efficiency.

[0009] Technical Solution

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] A continuous drilling device for processing metal plates of electrical cabinets comprises a drilling table body, a continuous drilling mechanism with a heat dissipation structure is provided on one side of the drilling table body, and fixing mechanisms capable of stacking multiple groups of metal plates of electrical cabinets are provided on both sides of the drilling table body, and a pressing mechanism for pressing the metal plates is provided above the fixing mechanism, a groove structure is provided on the upper surface of the drilling table body, and a support mechanism capable of sliding laterally is provided in the groove structure, and a dust removal mechanism for supporting the drilling position of the plates is slidably provided on the support mechanism, and a central support and collection mechanism is provided in the middle of the groove structure, and the central support and collection mechanism is connected to the dust removal mechanism.

[0012] As a further solution of the present invention, four groups of legs are welded to the lower end of the drilling table body, and a mounting platform is integrally formed on one side of the drilling table body.

[0013] As a further solution of the present invention, the continuous drilling mechanism includes a four-axis robotic arm, which is detachably mounted on a mounting table by bolts, and a machine head is mounted at the end of the four-axis robotic arm, a drill bit is mounted on the machine head, and the drill head is provided with heat dissipation grooves distributed in layers.

[0014] As a further solution of the present invention, the fixing mechanism is symmetrically arranged at the four corners of the upper end of the drilling table body. The fixing mechanism includes a pressing plate and a fixing table welded to the upper end of the drilling table body, and a limiting slide groove is provided on the inner side of the fixing table, and a limiting slide is integrally formed on one side of the pressing plate, and several groups of the pressing plates are slidably connected to the side of the fixing table through the limiting slide.

[0015] As a further solution of the present invention, the clamping mechanism includes a threaded rod, a threaded seat is integrally formed at the upper end of the fixed platform, the threaded rod and the threaded seat are threadedly connected, and a knob is welded at the upper end of the threaded rod, and the lower end of the threaded rod is rotatably connected to a limiting pressure block.

[0016] As a further solution of the present invention, the limiting pressure block is slidably connected to the side of the limiting slide groove, a rotating connection hole is opened on the upper part of the limiting pressure block, and the lower part of the threaded rod is inserted into the threaded rod and an integrally formed limiting plate is formed, and the threaded rod and the limiting pressure block are slidably connected through the cooperation of the rotating connection hole and the limiting plate.

[0017] As a further solution of the present invention, the groove structure includes a main groove opened on the upper surface of the drilling table body, a groove is opened on the side of the main groove, and two groups of symmetrically arranged receiving grooves are opened at the bottom of the main groove.

[0018] As a further solution of the present invention, the support mechanism is symmetrically arranged in two groups, and the support mechanism includes a support bar, one end of the support bar passes through the groove and is integrally formed with a limiting part, a handle is welded to the outside of the limiting part, and two groups of slides are integrally formed on the lower side of the support bar, and a roller is installed at the lower part of the slide, and the roller is arranged in the accommodating groove.

[0019] As a further solution of the present invention, the dust removal mechanism includes a limit seat, and a side groove is provided on the side of the support bar corresponding to the limit seat. The limit seat slides on the upper part of the support bar through the side groove, and a downwardly recessed collection hole is provided on the upper part of the limit seat. A connecting port 1 is provided on the side of the limit seat, and the connecting port 1 is connected to the collection hole.

[0020] As a further solution of the present invention, the central support collection mechanism includes a collection box, a cavity is opened inside the collection box, and the outer wall of the cavity is opened with ten groups of symmetrically arranged connection ports 2, the connection port 2 is connected with the connection port 1 through a rubber hose, and a main air suction port with a filter screen arranged inside is opened on the side of the collection box, the main air suction port is connected to the negative pressure device, and a slot is opened on the upper part of the collection box, a cover plate is slidably inserted into the upper part of the collection box through the slot, and the upper end of the cover plate is integrally formed with an anti-slip groove portion.

[0021] Beneficial effects

[0022] Compared with the prior art, the present invention provides a continuous drilling device for processing metal plates of electrical cabinets, which has the following beneficial effects:

[0023] 1. The present invention uses a four-axis robotic arm in a continuous drilling mechanism to drive a machine head and a drill bit to drill holes in stacked metal plates. The four-axis robotic arm has a fast and stable moving speed, which greatly improves the drilling efficiency.

[0024] 2. The present invention increases the heat dissipation area by providing heat dissipation grooves on the drill bit, thereby improving the heat dissipation efficiency of the drill bit during continuous operation, so that the physical performance of the drill bit during continuous operation can be guaranteed. Moreover, since the metal plates of the electrical cabinet are very thin, the heat dissipation grooves provided are unlikely to cause the drill bit to break due to reduced structural strength.

[0025] 3. The present invention can stack multiple groups of metal plates through the fixing mechanism, and then rotate the knob to make the limiting pressure blocks in the clamping and fixing mechanism press and fix the edges of the multiple groups of metal plates, so that a batch of plates can be drilled, which improves the drilling efficiency and increases the company's profit margin.

[0026] 4. The present invention can support the drilled holes of the metal plate through the cooperation of the support mechanism and the dust removal mechanism. The support mechanism can slide along the receiving groove to adjust its position through the roller at the bottom, and the limit seat in the dust removal mechanism can also slide above the support bar, thereby supporting the drilled holes of the plate and improving the quality of the drilling.

[0027] 5. The present invention collects the metal powder generated by drilling through the collection hole on the upper part of the limit seat, and the central support mechanism can not only support the plate, but also be connected to an external negative pressure device through the main exhaust port. The negative pressure device allows the collection hole to generate negative pressure to absorb the metal powder into the collection box, reducing the harm of the metal powder to the working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the front three-dimensional structure of a continuous drilling device for processing metal plates of electrical cabinets proposed by the present invention;

[0029] Figure 2 This is a schematic diagram of the front side three-dimensional structure of a drilling table body of a continuous drilling device for processing metal plates of electrical cabinets proposed by the present invention;

[0030] Figure 3 This is a schematic diagram of the front side three-dimensional structure of a drill bit of a continuous drilling device for processing metal plates of electrical cabinets proposed by the present invention;

[0031] Figure 4 This is a schematic diagram of the front three-dimensional structure of the central support and collection mechanism of a continuous drilling device for processing metal plates of electrical cabinets proposed by the present invention;

[0032] Figure 5 This is a schematic diagram of the front three-dimensional structure of a support mechanism of a continuous drilling device for processing metal plates of an electrical cabinet proposed by the present invention;

[0033] Figure 6 This is a front side stereoscopic structural diagram of the fixing mechanism and the pressing mechanism of a continuous drilling device for processing metal plates of an electrical cabinet proposed by the present invention.

[0034] Figure: 1, drilling table body; 2, continuous drilling mechanism; 3, fixing mechanism; 4, pressing mechanism; 5, groove structure; 6, supporting mechanism; 7, dust removal mechanism; 8, central support collection mechanism; 101, support legs; 102, mounting table; 201, mechanical arm; 202, machine head; 203, drill bit; 204, heat dissipation slot; 301, fixing table; 302, limit slide; 303, pressing plate; 304, limit slide; 305, threaded seat; 401, threaded rod; 402, knob; 403, limit pressure Block; 404, rotating connecting hole; 405, limiting piece; 501, main groove; 502, through groove; 503, accommodating groove; 601, support bar; 602, limiting part; 603, handle; 604, sliding seat; 605, roller; 606, side groove; 701, limiting seat; 702, collecting hole; 703, connecting port 1; 801, collecting box; 802, cavity; 803, connecting port 2; 804, main exhaust port; 805, slot; 806, filter; 807, cover; 808, anti-slip groove. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention include direct and indirect connections (couplings) unless otherwise specified. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0037] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0038] Reference Figures 1-6 A continuous drilling device for processing metal plates of electrical cabinets includes a drilling table body 1, a continuous drilling mechanism 2 with a heat dissipation structure is provided on one side of the drilling table body 1, and fixing mechanisms 3 for stacking multiple groups of metal plates of electrical cabinets are provided on both sides of the drilling table body 1, and a pressing mechanism 4 for pressing the metal plates is provided above the fixing mechanism 3, a groove structure 5 is provided on the upper surface of the drilling table body 1, and a support mechanism 6 that can slide laterally is provided in the groove structure 5, and a dust removal mechanism 7 for supporting the drilling position of the plate is slidably provided on the support mechanism 6, and a central support collection mechanism 8 is provided in the middle of the groove structure 5, and the central support collection mechanism 8 is connected to the dust removal mechanism 7.

[0039] In particular, in the present invention, four groups of legs 101 are welded to the lower end of the drilling table body 1, and a mounting platform 102 is integrally formed on one side of the drilling table body 1. Rubber pads are installed at the bottom of the legs 101 for anti-slip, and threaded holes are opened on the mounting platform 102.

[0040] It should be noted that the continuous drilling mechanism 2 includes a four-axis robot arm 201, which is detachably mounted on the mounting platform 102 by bolts, and a machine head 202 is mounted on the end of the four-axis robot arm 201, and a drill bit 203 is mounted on the machine head 202, and a heat dissipation groove 204 distributed in layers is opened on the drill bit 203. The heat dissipation groove 204 on the drill bit 203 is cast in one piece, and the heat dissipation groove 204 increases the heat dissipation area of ​​the drill bit 203, improves the heat dissipation efficiency of the drill bit 203 during continuous work, and ensures the physical properties of the drill bit 203 during continuous work. Moreover, since the metal plates of the electrical cabinet are very thin, the heat dissipation groove 204 makes it difficult for the drill bit 203 to break due to reduced structural strength.

[0041] In particular, in the present invention, the fixing mechanism 3 is symmetrically arranged at the four corners of the upper end of the drilling table body 1. The fixing mechanism 3 includes a pressing plate 303 and a fixing platform 301 welded to the upper end of the drilling table body 1, and a limiting slide groove 302 is provided on the inner side of the fixing platform 301, and a limiting slide 304 is integrally formed on one side of the pressing plate 303. Several groups of pressing plates 303 are slidably connected to the side of the fixing platform 301 through the limiting slide 304. The pressing plate 303 can separate multiple groups of metal plates to prevent the drilling effect from being reduced due to the mutual involvement of the plates.

[0042] It should be noted that the clamping mechanism 4 includes a threaded rod 401, and a threaded seat 305 is integrally formed at the upper end of the fixed platform 301. The threaded rod 401 and the threaded seat 305 are threadedly connected, and a knob 402 is welded to the upper end of the threaded rod 401. The lower end of the threaded rod 401 is rotatably connected to a limiting pressure block 403. By rotating the knob 402, the limiting pressure block 403 can be driven up and down to fix and unlock the edge of the metal plate.

[0043] In particular, in the present invention, the limiting pressure block 403 is slidably connected to the side of the limiting slide groove 302, a rotating connection hole 404 is opened on the upper part of the limiting pressure block 403, and the lower part of the threaded rod 401 is inserted into the threaded rod 401 and an integrally formed limiting plate 405 is formed, and the threaded rod 401 and the limiting pressure block 403 are slidably connected through the cooperation of the rotating connection hole 404 and the limiting plate 405.

[0044] It should be noted that the groove structure 5 includes a main groove 501 opened on the upper surface of the drilling table body 1, a groove 502 is opened on the side of the main groove 501, and two groups of symmetrically arranged receiving grooves 503 are opened at the bottom of the main groove 501.

[0045] In particular, in the present invention, the support mechanism 6 is symmetrically arranged in two groups, and the support mechanism 6 includes a support bar 601. One end of the support bar 601 passes through the groove 502 and is integrally formed with a limiting portion 602. A handle 603 is welded to the outside of the limiting portion 602, and two groups of slides 604 are integrally formed on the lower side of the support bar 601. The slide 604 is arranged in the accommodating groove 503. The slide 604 has a limiting function to prevent the support mechanism 6 from being dislocated. A roller 605 is installed at the lower part of the slide 604. The roller 605 is arranged in the accommodating groove 503. The roller 605 can allow the support bar 601 to move horizontally smoothly in the main groove 501.

[0046] It should be noted that the dust removal mechanism 7 includes a limit seat 701, the upper part of the limit seat 701 is flush with the upper surface of the drilling table body 1, and the limit seat 701 can move horizontally along the support bar 601, and then cooperate with the horizontal movement of the support bar 601 itself to allow the limit seat 701 to move to the bottom of both sides of the plate, thereby supporting the bottom of the drill hole during drilling, thereby improving the quality of the drill hole, and the side of the support bar 601 is provided with a side groove 606 corresponding to the limit seat 701, and the limit seat 701 slides on the upper part of the support bar 601 through the side groove 606, and the upper part of the limit seat 701 is provided with a downwardly recessed collection hole 702, and the side of the limit seat 701 is provided with a connecting port 1 703, and the connecting port 1 703 is connected to the collection hole 702.

[0047] In particular, in the present invention, the central support collection mechanism 8 includes a collection box 801, the interior of the collection box 801 is provided with a cavity 802, and the outer wall of the cavity 802 is provided with ten groups of symmetrically arranged connection ports 2 803, the connection ports 2 803 are connected to the connection port 1 703 through a rubber hose, and the side of the collection box 801 is provided with a main air extraction port 804 with a filter 806 inside, the main air extraction port 804 is connected to the negative pressure device, and the negative pressure device can generate negative pressure in the collection hole 702, which cooperates with the metal powder itself. Gravity can flow into the collection hole 702 and enter the collection box 801 along the rubber hose and be filtered and retained by the filter screen 806. A slot 805 is provided on the upper part of the collection box 801. A cover plate 807 is slidably inserted into the upper part of the collection box 801 through the slot 805, and the upper end of the cover plate 807 is integrally formed with an anti-slip groove 808. The cover plate 807 and the collection box 801 are both made of steel, and the upper part is flush with the upper surface of the drilling table body 1, which can support the middle part of the plate to prevent the middle part of the plate from falling due to its own action.

[0048] The present invention is divided into the following steps when used:

[0049] S1: First determine the placement of the plate and the location of the required drilling hole, move the support bar 601 horizontally using the handle 603, and then move the limit seat 701 above the support bar 601 to just below the drilling location;

[0050] S2: First, place the bottom plate directly on top of the drilling platform body 1, and then use the pressing sheet 303 to separate the upper layers of the stacked plates to prevent them from being entangled during drilling;

[0051] S3: After the last plate is placed, the positions of the plates are adjusted so that the edges of all plates are flush with the previously predetermined placement positions, and then the edges of all plates are pressed and fixed by the pressing mechanism 4;

[0052] S4: Rotate the knob 402 to press the limit pressing block 403 down to the uppermost edge of the plate to fix the plate;

[0053] S5: Connect a negative pressure device to the main air extraction port 804 of the collection box 801, start the negative pressure device first, and then start the robot arm 201 and the head 202 to drill at the predetermined position;

[0054] S6: After drilling is completed, loosen the knob 402 and remove the plates from top to bottom. After multiple drilling operations, slide open the cover 807 to clean the powder in the collection box 801.

[0055] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A continuous drilling device for processing metal plates of electrical cabinets, comprising a drilling table body (1), characterized in that: A continuous drilling mechanism (2) with a heat dissipation structure is provided on one side of the drilling platform body (1), and fixing mechanisms (3) capable of stacking a plurality of sets of metal plates of electrical cabinets are provided on both sides of the drilling platform body (1), and a pressing mechanism (4) for pressing the metal plates is provided above the fixing mechanism (3), a groove structure (5) is provided on the upper surface of the drilling platform body (1), and a support mechanism (6) capable of sliding laterally is provided in the groove structure (5), and a dust removal mechanism (7) for supporting the drilling position of the plates is slidably provided on the support mechanism (6), and a central support collection mechanism (8) is provided in the middle of the groove structure (5), and the central support collection mechanism (8) is connected to the dust removal mechanism (7).

2. A continuous drilling device for processing metal plates of an electrical cabinet according to claim 1, characterized in that: Four groups of legs (101) are welded to the lower end of the drilling platform body (1), and a mounting platform (102) is integrally formed on one side of the drilling platform body (1).

3. The continuous drilling device for processing metal plates of an electrical cabinet according to claim 2, characterized in that: The continuous drilling mechanism (2) comprises a four-axis mechanical arm (201), the continuous drilling mechanism (2) is detachably mounted on a mounting platform (102) via bolts, and a machine head (202) is mounted at the end of the four-axis mechanical arm (201), a drill bit (203) is mounted on the machine head (202), and the drill bit (203) is provided with heat dissipation grooves (204) distributed in layers.

4. The continuous drilling device for processing metal plates of an electrical cabinet according to claim 1, characterized in that: The fixing mechanism (3) is symmetrically arranged at the four corners of the upper end of the drilling platform body (1), and the fixing mechanism (3) includes a pressing plate (303) and a fixing platform (301) welded to the upper end of the drilling platform body (1), and a limiting sliding groove (302) is provided on the inner side of the fixing platform (301), and a limiting sliding plate (304) is integrally formed on one side of the pressing plate (303), and a plurality of groups of the pressing plates (303) are slidably connected to the side of the fixing platform (301) through the limiting sliding plate (304).

5. The continuous drilling device for processing metal plates of an electrical cabinet according to claim 4, characterized in that: The clamping mechanism (4) comprises a threaded rod (401), a threaded seat (305) is integrally formed on the upper end of the fixing platform (301), the threaded rod (401) and the threaded seat (305) are threadedly connected, and a knob (402) is welded to the upper end of the threaded rod (401), and the lower end of the threaded rod (401) is rotatably connected to a limiting pressure block (403).

6. The continuous drilling device for processing metal plates of an electrical cabinet according to claim 5, characterized in that: The limiting pressure block (403) is slidably connected to the side of the limiting slide groove (302), the upper part of the limiting pressure block (403) is provided with a rotation connection hole (404), and the lower part of the threaded rod (401) is inserted into the threaded rod (401) and integrally formed with a limiting plate (405), and the threaded rod (401) and the limiting pressure block (403) are slidably connected through the cooperation of the rotation connection hole (404) and the limiting plate (405).

7. The continuous drilling device for processing metal plates of an electrical cabinet according to claim 1, characterized in that: The groove structure (5) comprises a main groove (501) formed on the upper surface of the drilling platform body (1), a side of the main groove (501) is provided with a groove (502), and the bottom of the main groove (501) is provided with two groups of symmetrically arranged receiving grooves (503).

8. The continuous drilling device for processing metal plates of an electrical cabinet according to claim 7, characterized in that: The support mechanism (6) is symmetrically arranged in two groups, and the support mechanism (6) includes a support bar (601), one end of the support bar (601) passes through the groove (502) and is integrally formed with a limiting portion (602), a handle (603) is welded to the outer side of the limiting portion (602), and two groups of slides (604) are integrally formed on the lower side of the support bar (601), and a roller (605) is installed at the lower part of the slide (604), and the roller (605) is arranged in the accommodating groove (503).

9. The continuous drilling device for processing metal plates of an electrical cabinet according to claim 8, characterized in that: The dust removal mechanism (7) includes a limiting seat (701), a side groove (606) is provided on the side of the support bar (601) corresponding to the limiting seat (701), the limiting seat (701) slides on the upper part of the support bar (601) through the side groove (606), and a downwardly recessed collecting hole (702) is provided on the upper part of the limiting seat (701), and a connecting port (703) is provided on the side of the limiting seat (701), and the connecting port (703) is communicated with the collecting hole (702).

10. The continuous drilling device for processing metal plates of an electrical cabinet according to claim 9, characterized in that: The central support collection mechanism (8) includes a collection box (801), a cavity (802) is provided inside the collection box (801), and the outer wall of the cavity (802) is provided with ten groups of symmetrically arranged connection ports (803), the connection ports (803) are connected to the connection port (703) through a rubber hose, and a main air extraction port (804) with a filter (806) provided inside is provided on the side of the collection box (801), the main air extraction port (804) is connected to the negative pressure device, and a slot (805) is provided on the upper part of the collection box (801), and a cover plate (807) is slidably inserted into the upper part of the collection box (801) through the slot (805), and the upper end of the cover plate (807) is integrally formed with an anti-slip groove portion (808).

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