Cutting device for manufacturing composite aluminum alloy doors and windows

Abstract

The utility model relates to the technical field of composite aluminum alloy doors and windows, and discloses a cutting device for manufacturing composite aluminum alloy doors and windows, which comprises a cutting machine and an adjusting component. The cutting machine, the workbench, the cutting motor, the cutting disc, the adjusting assembly, a movable sleeve, an adjusting block, a fixed tension spring, a protruding block and other structural components are arranged, the composite aluminum alloy material is cut through the cutting machine, and the angle of the composite aluminum alloy material cut by the cutting disc is adjusted through the adjusting assembly; a composite aluminum alloy material is clamped and fixed through the clamping assembly, the composite aluminum alloy material is prevented from inclining through the positioning assembly, the composite aluminum alloy material is conveniently moved through the moving assembly, and the effect of conveniently cutting the composite aluminum alloy material at different angles is achieved; the problem that when the composite aluminum alloy material is moved, the composite aluminum alloy material can be moved in a misplaced mode, and the cutting angle of the composite aluminum alloy material deviates is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of composite aluminum alloy doors and windows, and in particular relates to a cutting device for preparing composite aluminum alloy doors and windows. Background Art

[0002] Composite aluminum alloy is a composite material formed by combining aluminum alloy with other non-metallic or metallic materials. It usually consists of two parts: matrix phase and reinforcement phase. The matrix phase is aluminum alloy, and the reinforcement phase can be carbon fiber, glass fiber, ceramic particles, etc., to improve the specific properties of the material, such as strength, rigidity, wear resistance or corrosion resistance.

[0003] When processing composite aluminum alloy doors and windows, it is necessary to cut the composite aluminum alloy materials. The composite aluminum alloy materials of composite aluminum alloy doors and windows are usually in the shape of long rods. When cutting the composite aluminum alloy materials, a cutting machine is needed. The composite aluminum alloy materials are cut by the cutting disk of the cutting machine rotating at high speed. In the process of cutting the composite aluminum alloy materials, the workers need to manually move the composite aluminum alloy materials so that the composite aluminum alloy materials contact the cutting disk, thereby cutting off the composite aluminum alloy materials. In order to meet the processing needs of composite aluminum alloy doors and windows, it is necessary to adjust the cutting angle of the composite aluminum alloy materials to facilitate the welding and installation of the composite aluminum alloy materials. In the process of workers moving the composite aluminum alloy materials, the composite aluminum alloy materials may be dislocated, resulting in a shift in the cutting angle of the composite aluminum alloy materials, affecting the welding and installation of the composite aluminum alloy materials. The problem with the above technology is that the composite aluminum alloy materials may be dislocated when the composite aluminum alloy materials are moved, resulting in a shift in the cutting angle of the composite aluminum alloy materials. Utility Model Content

[0004] In view of the problems existing in the prior art, the utility model provides a cutting device for preparing composite aluminum alloy doors and windows, which can overcome the above problems or at least partially solve the above problems.

[0005] The utility model is implemented as follows: a cutting device for preparing composite aluminum alloy doors and windows, comprising a cutting machine and an adjusting component, wherein the cutting comprises a workbench, a cutting motor and a cutting disc, the bottom of the cutting motor is fixedly connected to the bottom inside the workbench, the rear side of the cutting disc is fixedly connected to the front side of the output end of the cutting motor, the adjusting component comprises two movable sleeves, two adjusting blocks, a fixed tension spring and a plurality of protrusions, the surfaces of the two movable sleeves are movably connected to the front and rear sides inside the workbench respectively, the bottoms of the surfaces of the two adjusting blocks are plug-connected to the inside of the two movable sleeves, the bottoms of the fixed tension springs are fixedly connected to the bottom inside the front movable sleeve, the tops of the fixed tension springs are fixedly connected to the bottom of the front adjusting block, the side of the front adjusting block close to the plurality of protrusions is fixedly connected to the tops of the plurality of protrusions, and the bottoms of the plurality of protrusions are plug-connected to the top inside the front movable sleeve;

[0006] The cutting machine is used for cutting composite aluminum alloy materials;

[0007] The adjustment assembly is used to adjust the angle at which the cutting disc cuts the composite aluminum alloy material.

[0008] In order to facilitate the cutting of the composite aluminum alloy material, preferably, the tops of the two adjusting blocks are fixedly connected with support plates, the tops of the two support plates are provided with clamping assemblies, the interiors of the two clamping assemblies are provided with positioning assemblies, and the front side of the workbench is provided with a moving assembly. By placing the composite aluminum alloy material inside the two clamping assemblies, the composite aluminum alloy material is located on the tops of the two support plates, and the front support plate is moved upward. During the movement of the front support plate, the front adjusting block is driven to move upward, and during the movement of the front adjusting block, multiple protrusions are driven to move upward, the fixed tension spring is deformed, and multiple protrusions are disengaged from the front moving sleeve, and the front side is rotated. The adjusting block can adjust the angle of the composite aluminum alloy material. The movement of the composite aluminum alloy material drives the rear clamping assembly to move. The movement of the rear clamping assembly drives the rear moving sleeve to slide on the rear side of the workbench, and the front support plate is moved downward to insert multiple protrusions into the interior of the front moving sleeve. The fixed tension spring rebounds to keep the adjusting block stable. The composite aluminum alloy material is clamped and fixed by two clamping assemblies. The composite aluminum alloy material is positioned by two positioning assemblies to prevent the composite aluminum alloy material from tilting inside the two clamping assemblies. The composite aluminum alloy material is driven to move by the moving assembly, and the composite aluminum alloy material is cut and processed by the cutting disk.

[0009] In order to clamp and fix the composite aluminum alloy material, preferably, the front side clamping assembly includes a clamping bolt, a clamping plate and a limiting rod, the bottom of the clamping bolt surface is movably connected to the left side inside the front side support plate, the surface of the clamping bolt is threadedly connected to the left side inside the clamping plate, the top of the limiting rod is fixedly connected to the right side of the bottom of the clamping plate, and the surface of the limiting rod is slidingly connected to the right side inside the front side support plate. By turning the clamping bolt, the clamping bolt drives the clamping plate to move downward during rotation, and the clamping plate drives the limiting rod to move downward during downward movement. The limiting rod slides inside the front side support plate to limit the direction of the clamping plate, and the bottom of the clamping plate is in close contact with the composite aluminum alloy material, thereby clamping and fixing the composite aluminum alloy material.

[0010] In order to prevent the composite aluminum alloy material from tilting inside the clamping assembly, preferably, the positioning assembly on the front side includes two sliding bars, two positioning plates and four positioning springs, the left and right sides of the two sliding bars are respectively fixedly connected to the front and back sides of the left and right sides of the clamping plates, the front and back sides of the two positioning plates are respectively slidably connected to the left and right sides of the surfaces of the two sliding bars, the sides of the four positioning springs close to the two positioning plates are respectively fixedly connected to the opposite sides of the two positioning plates, and the sides of the four positioning springs close to the clamping plates are respectively fixedly connected to the left and right sides of the inside of the clamping plates, and in the process of the clamping plate moving downward, the two positioning plates are driven to move downward, the two positioning plates contact the composite aluminum alloy material, and the composite aluminum alloy material pushes the two positioning plates to move in opposite directions, so that the four positioning springs are deformed, and the two positioning plates generate a thrust toward the opposite ends, thereby positioning the composite aluminum alloy material to prevent the composite aluminum alloy material from tilting.

[0011] In order to facilitate the movement of the composite aluminum alloy material, preferably, the moving assembly includes a moving motor, a moving screw and a moving block. The left side of the moving motor is fixedly connected to the right side of the workbench, the right side of the moving screw is fixedly connected to the left side of the output end of the moving motor, the left side of the moving screw is movably connected to the left side inside the workbench, the surface of the moving screw is connected to the internal thread of the moving block, the side of the moving block close to the workbench is slidingly connected to the inside of the workbench, the front side of the moving block is fixedly connected to the rear side of the front moving sleeve, and by starting the moving motor, the output end of the moving motor drives the moving screw to rotate, and the moving screw drives the moving block to move to the right during the rotation, and the front moving sleeve is driven to move during the movement of the moving block, thereby driving the composite aluminum alloy material to move to the right.

[0012] In order to prevent workers from touching the cutting disk and getting cut when taking out the composite aluminum alloy material, preferably, a first protective plate is provided on the top of the cutting disk, and the bottom of the first protective plate is fixedly connected to the top of the workbench, and a second protective plate is provided on the bottom of the cutting disk, and the top of the second protective plate is fixedly connected to the bottom of the workbench. The cutting disk is blocked by the first protective plate and the second protective plate, thereby preventing the worker from touching the cutting disk.

[0013] In order to ensure stable movement of the rear movable sleeve, preferably, a slider is fixedly connected to the rear side of the movable sleeve, and the surface of the slider is slidably connected to the rear side inside the workbench. The movement of the rear movable sleeve drives the slider to move, and the slider slides inside the workbench to limit the moving direction of the rear movable sleeve, thereby ensuring stable movement of the rear movable sleeve.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] The utility model is provided with structural components such as a cutting machine, a workbench, a cutting motor, a cutting disc, an adjusting component, a movable sleeve, an adjusting block, a fixed tension spring and a protrusion. The cutting machine is used to cut the composite aluminum alloy material. The adjusting component is used to adjust the cutting angle of the composite aluminum alloy material by the cutting disc. The composite aluminum alloy material is clamped and fixed by the clamping component. The positioning component is used to prevent the composite aluminum alloy material from tilting. The moving component is used to facilitate the movement of the composite aluminum alloy material, thereby achieving the effect of conveniently cutting the composite aluminum alloy material at different angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a three-dimensional structure provided by an embodiment of the utility model;

[0017] Figure 2 It is a three-dimensional schematic diagram of a local structure provided by an embodiment of the utility model;

[0018] Figure 3 It is a three-dimensional structural schematic diagram of the adjustment component provided by the embodiment of the utility model.

[0019] In the figure: 1. cutting machine; 1a. workbench; 1b. cutting motor; 1c. cutting disc; 2. adjusting assembly; 2a. moving sleeve; 2b. adjusting block; 2c. fixed tension spring; 2d. protrusion; 3. support plate; 4. clamping assembly; 401. clamping bolt; 402. clamping plate; 403. limit rod; 5. positioning assembly; 501. slide bar; 502. positioning plate; 503. positioning spring; 6. moving assembly; 601. moving motor; 602. moving screw; 603. moving block; 7. first protective plate; 8. second protective plate; 9. slider. DETAILED DESCRIPTION

[0020] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

[0021] The structure of the utility model is described in detail below in conjunction with the accompanying drawings.

[0022] like Figures 1 to 3As shown, a cutting device for preparing composite aluminum alloy doors and windows provided by an embodiment of the utility model comprises a cutting machine 1 and an adjusting component 2, wherein the cutting machine comprises a workbench 1a, a cutting motor 1b and a cutting disc 1c, wherein the bottom of the cutting motor 1b is fixedly connected to the bottom inside the workbench 1a, and the rear side of the cutting disc 1c is fixedly connected to the front side of the output end of the cutting motor 1b, and the adjusting component 2 comprises two movable sleeves 2a, two adjusting blocks 2b, a fixed tension spring 2c and a plurality of protrusions 2d, wherein the surfaces of the two movable sleeves 2a are movably connected to the front and rear sides inside the workbench 1a respectively, the bottoms of the surfaces of the two adjusting blocks 2b are plug-connected to the inside of the two movable sleeves 2a, and the bottoms of the fixed tension springs 2c are fixedly connected to the bottom inside the front movable sleeve 2a, The top of the fixed tension spring 2c is fixedly connected to the bottom of the front adjustment block 2b, and the side of the front adjustment block 2b close to the multiple protrusions 2d is fixedly connected to the top of the multiple protrusions 2d, and the bottom of the multiple protrusions 2d is plug-connected with the top of the front movable sleeve 2a; the cutting machine 1 is used to cut the composite aluminum alloy material; the adjustment component 2 is used to adjust the angle at which the cutting disk 1c cuts the composite aluminum alloy material. In order to facilitate the cutting of the composite aluminum alloy material, the tops of the two adjustment blocks 2b are fixedly connected to the support plates 3, the tops of the two support plates 3 are provided with clamping components 4, and the interiors of the two clamping components 4 are provided with positioning components 5. The front side of the interior of the workbench 1a is provided with a moving component 6. By placing the composite aluminum alloy material on the two clamping components The composite aluminum alloy material is located inside the component 4, and the composite aluminum alloy material is located on the top of the two support plates 3. The front support plate 3 is moved upward. During the movement of the front support plate 3, the front adjustment block 2b is driven to move upward. During the movement of the front adjustment block 2b, multiple protrusions 2d are driven to move upward, and the fixed tension spring 2c is deformed. Multiple protrusions 2d are all out of contact with the front movable sleeve 2a. The front adjustment block 2b is rotated to adjust the angle of the composite aluminum alloy material. During the movement of the composite aluminum alloy material, the rear clamping assembly 4 is driven to move. During the movement of the rear clamping assembly 4, the rear movable sleeve 2a is driven to slide on the rear side of the workbench 1a, and the front support plate 3 is moved downward, so that multiple protrusions 2d are inserted into the interior of the front movable sleeve 2a, and the fixed tension spring 2c rebounds to make The adjustment block 2b remains stable, and the composite aluminum alloy material is clamped and fixed by two clamping components 4. The composite aluminum alloy material is positioned by two positioning components 5 to prevent the composite aluminum alloy material from tilting inside the two clamping components 4. The composite aluminum alloy material is driven to move by the moving component 6, and the composite aluminum alloy material is cut and processed by the cutting disk 1c. In order to clamp and fix the composite aluminum alloy material, the front clamping component 4 includes a clamping bolt 401, a clamping plate 402 and a limiting rod 403. The bottom of the surface of the clamping bolt 401 is movably connected to the left side inside the front side support plate 3, the surface of the clamping bolt 401 is threadedly connected to the left side inside the clamping plate 402, and the top of the limiting rod 403 is fixedly connected to the right side of the bottom of the clamping plate 402.The surface of the limit rod 403 is slidably connected to the right side inside the front side support plate 3. By tightening the clamping bolt 401, the clamping bolt 401 rotates and drives the clamping plate 402 to move downward. The clamping plate 402 moves downward and drives the limit rod 403 to move downward. The limit rod 403 slides inside the front side support plate 3 to limit the direction of the clamping plate 402. The bottom of the clamping plate 402 is in close contact with the composite aluminum alloy material, thereby clamping and fixing the composite aluminum alloy material. In order to prevent the composite aluminum alloy material from tilting inside the clamping assembly 4, the front side positioning assembly 5 includes two sliding rods 501, two positioning plates 502 and four positioning springs 503. The left and right sides of the two sliding rods 501 are respectively connected to the front left and right sides of the clamping plate 402. The front and rear sides of the two positioning plates 502 are respectively slidably connected to the left and right sides of the surfaces of the two slide bars 501, and the sides of the four positioning springs 503 close to the two positioning plates 502 are respectively fixedly connected to the opposite sides of the two positioning plates 502, and the sides of the four positioning springs 503 close to the clamping plate 402 are respectively fixedly connected to the left and right sides of the clamping plate 402. During the downward movement of the clamping plate 402, the two positioning plates 502 are driven to move downward, and the two positioning plates 502 contact the composite aluminum alloy material, and the composite aluminum alloy material pushes the two positioning plates 502 to move in opposite directions, so that the four positioning springs 503 are deformed, so that the two positioning plates 502 generate thrust toward the opposite ends, thereby In order to position the material and prevent the composite aluminum alloy material from tilting, in order to facilitate the movement of the composite aluminum alloy material, the moving component 6 includes a moving motor 601, a moving screw 602 and a moving block 603. The left side of the moving motor 601 is fixedly connected to the right side of the workbench 1a, the right side of the moving screw 602 is fixedly connected to the left side of the output end of the moving motor 601, the left side of the moving screw 602 is movably connected to the left side inside the workbench 1a, the surface of the moving screw 602 is connected to the internal thread of the moving block 603, the side of the moving block 603 close to the workbench 1a is slidably connected to the inside of the workbench 1a, the front side of the moving block 603 is fixedly connected to the rear side of the front moving sleeve 2a, and by starting the moving motor 601, the output of the moving motor 601 is moved. The end drives the moving screw 602 to rotate, and the moving screw 602 drives the moving block 603 to move to the right during the rotation. The moving block 603 drives the front moving sleeve 2a to move during the movement, thereby driving the composite aluminum alloy material to move to the right. In order to prevent the worker from touching the cutting disk 1c and getting cut when taking out the composite aluminum alloy material, a first protective plate 7 is provided on the top of the cutting disk 1c, and the bottom of the first protective plate 7 is fixedly connected to the top of the workbench 1a. The bottom of the cutting disk 1c is provided with a second protective plate 8, and the top of the second protective plate 8 is fixedly connected to the bottom of the workbench 1a. The cutting disk 1c is blocked by the first protective plate 7 and the second protective plate 8, thereby preventing the worker from touching the cutting disk 1c. In order to make the movement of the rear moving sleeve 2a stable,The rear side of the rear moving sleeve 2a is fixedly connected with a slider 9, and the surface of the slider 9 is slidably connected with the rear side inside the workbench 1a. The movement of the rear moving sleeve 2a drives the slider 9 to move. The slider 9 slides inside the workbench 1a to limit the moving direction of the rear moving sleeve 2a, thereby making the movement of the rear moving sleeve 2a stable.

[0023] The working principle of this utility model:

[0024] When cutting the composite aluminum alloy material, the composite aluminum alloy material is placed inside the two clamping assemblies 4, the composite aluminum alloy material is located on the top of the two support plates 3, and the front support plate 3 is moved upward. During the movement of the front support plate 3, the front adjustment block 2b is driven to move upward. During the movement of the front adjustment block 2b, multiple protrusions 2d are driven to move upward, and the fixed tension spring 2c is deformed. Multiple protrusions 2d are all out of contact with the front moving sleeve 2a, and the front adjustment block 2b is rotated to adjust the composite aluminum alloy material to the angle required for cutting. The alloy material moves, and the rear clamping assembly 4 is driven to move. The rear clamping assembly 4 is driven to slide on the rear side of the workbench 1a. The rear adjustment block 2b rotates, and the front support plate 3 is moved downward, so that the plurality of protrusions 2d are inserted into the interior of the front movable sleeve 2a. The fixed tension spring 2c rebounds to keep the adjustment block 2b stable. The clamping bolt 401 is turned, and the clamping bolt 401 rotates, and the clamping plate 402 is driven to move downward. The clamping plate 402 is driven to move downward. 02 moves downward, the two positioning plates 502 come into contact with the composite aluminum alloy material, and the composite aluminum alloy material pushes the two positioning plates 502 to move in opposite directions, so that the four positioning springs 503 are deformed, and the two positioning plates 502 generate thrusts toward the opposite ends, thereby positioning the composite aluminum alloy material, and the bottom of the clamping plate 402 is in close contact with the composite aluminum alloy material, thereby clamping and fixing the composite aluminum alloy material, starting the moving motor 601 and the cutting motor 1b, and the output end of the cutting motor 1b drives the cutting disc 1c to rotate, and the moving motor The output end of the machine 601 drives the moving screw 602 to rotate, and the moving screw 602 drives the moving block 603 to move to the right during the rotation. The moving block 603 drives the front moving sleeve 2a to move during the movement, thereby driving the composite aluminum alloy material to move to the right, so that the composite aluminum alloy material is cut by the cutting disk 1c. After the cutting of the composite aluminum alloy material is completed, the cutting motor 1b is turned off, and the clamping bolt 401 is turned in the opposite direction, so that the clamping plate 402 is out of contact with the composite aluminum alloy material, thereby taking out the cut composite aluminum alloy material.

[0025] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0026] The above description is only a preferred embodiment of the present invention, and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with this patent will not depart from the scope of the technical solution of the present invention.

Claims

1. A cutting device for preparing composite aluminum alloy doors and windows, comprising a cutting machine (1) and an adjustment component (2), characterized in that: The cutting machine comprises a workbench (1a), a cutting motor (1b) and a cutting disc (1c); the bottom of the cutting motor (1b) is fixedly connected to the bottom of the workbench (1a); the rear side of the cutting disc (1c) is fixedly connected to the front side of the output end of the cutting motor (1b); the adjustment component (2) comprises two movable sleeves (2a), two adjustment blocks (2b), a fixed tension spring (2c) and a plurality of protrusions (2d); the surfaces of the two movable sleeves (2a) are respectively movably connected to the front and rear sides of the workbench (1a); The bottoms of the surfaces of the two adjustment blocks (2b) are plug-connected to the inside of the two movable sleeves (2a); the bottoms of the fixed tension springs (2c) are fixedly connected to the bottom of the front movable sleeve (2a); the tops of the fixed tension springs (2c) are fixedly connected to the bottom of the front adjustment block (2b); the side of the front adjustment block (2b) close to the multiple protrusions (2d) is fixedly connected to the tops of the multiple protrusions (2d); and the bottoms of the multiple protrusions (2d) are plug-connected to the top of the front movable sleeve (2a); The cutting machine (1) is used to cut composite aluminum alloy materials; The adjustment component (2) is used to adjust the angle at which the cutting disc (1c) cuts the composite aluminum alloy material.

2. A cutting device for preparing composite aluminum alloy doors and windows as claimed in claim 1, characterized in that: The tops of the two adjustment blocks (2b) are fixedly connected to a support plate (3), the tops of the two support plates (3) are provided with a clamping assembly (4), the interiors of the two clamping assemblies (4) are provided with a positioning assembly (5), and the front side of the interior of the workbench (1a) is provided with a moving assembly (6).

3. A cutting device for preparing composite aluminum alloy doors and windows as claimed in claim 2, characterized in that: The front side clamping assembly (4) comprises a clamping bolt (401), a clamping plate (402) and a limiting rod (403); the bottom of the surface of the clamping bolt (401) is movably connected to the left side inside the front side support plate (3); the surface of the clamping bolt (401) is threadedly connected to the left side inside the clamping plate (402); the top of the limiting rod (403) is fixedly connected to the right side of the bottom of the clamping plate (402); and the surface of the limiting rod (403) is slidably connected to the right side inside the front side support plate (3).

4. A cutting device for preparing composite aluminum alloy doors and windows as claimed in claim 3, characterized in that: The positioning assembly (5) on the front side comprises two slide bars (501), two positioning plates (502) and four positioning springs (503); the left and right sides of the two slide bars (501) are respectively fixedly connected to the front and rear sides of the left and right sides of the inside of the clamping plate (402); the front and rear sides of the inside of the two positioning plates (502) are respectively slidably connected to the left and right sides of the surface of the two slide bars (501); the sides of the four positioning springs (503) close to the two positioning plates (502) are respectively fixedly connected to the opposite sides of the two positioning plates (502); the sides of the four positioning springs (503) close to the clamping plate (402) are respectively fixedly connected to the left and right sides of the inside of the clamping plate (402).

5. A cutting device for preparing composite aluminum alloy doors and windows as claimed in claim 2, characterized in that: The moving assembly (6) comprises a moving motor (601), a moving screw (602) and a moving block (603); the left side of the moving motor (601) is fixedly connected to the right side of the workbench (1a); the right side of the moving screw (602) is fixedly connected to the left side of the output end of the moving motor (601); the left side of the moving screw (602) is movably connected to the left side inside the workbench (1a); the surface of the moving screw (602) is threadedly connected to the inside of the moving block (603); the side of the moving block (603) close to the workbench (1a) is slidably connected to the inside of the workbench (1a); and the front side of the moving block (603) is fixedly connected to the rear side of the front moving sleeve (2a).

6. A cutting device for preparing composite aluminum alloy doors and windows as claimed in claim 1, characterized in that: The top of the cutting disc (1c) is sleeved with a first protective plate (7), the bottom of the first protective plate (7) is fixedly connected to the top of the workbench (1a), and the bottom of the cutting disc (1c) is sleeved with a second protective plate (8), the top of the second protective plate (8) is fixedly connected to the bottom of the workbench (1a).

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