Steel bar cutting device for construction

Abstract

The present invention discloses a steel bar cutting device for construction, comprising: a support seat, a cutting opening is provided in the middle of the support seat; a support assembly for supporting steel bars, the support assembly is located above the cutting opening and is longitudinally spanned across the cutting opening; a first protective cover and a second protective cover, the first protective cover and the second protective cover are laterally connected to the top of the support seat in an openable and closable manner; a cutting assembly for cutting steel bars, the cutting assembly being movably arranged in the cutting space in an opening and closing direction; a driving member for driving the first protective cover and the cutting assembly to move synchronously in the opening and closing direction; a linkage member for linking the second protective cover to move relative to each other in the opening and closing direction when the first protective cover moves in the opening and closing direction, the linkage member being movably connected between the first protective cover and the second protective cover, and the provision of the cutting device improves safety.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, in particular to a steel bar cutting device for building construction. Background Art

[0002] Building construction refers to the production activities during the implementation phase of a project. It is the process of constructing various buildings. It can also be said to be the process of transforming the various lines on the design drawings into physical objects at the designated location. It includes foundation construction, main structure construction, roof construction, and decorative construction. The place where construction work is carried out is called "construction site" or "construction site", also called construction site, and its steel bar is one of the necessary materials for the construction, generally refers to steel used for reinforced concrete and prestressed reinforced concrete, its cross-section is circular, sometimes square with rounded corners, and steel bars for reinforced concrete refer to straight bars or coiled steel bars used for reinforced concrete reinforcement, and its appearance is divided into two types: plain round steel bars and deformed steel bars, and the delivery status is straight bars and coiled round bars. The existing steel bars will use corresponding cutting and chopping mechanisms to cut the steel bars during processing, the purpose is to process the steel bars into small pieces and cut them into suitable lengths for use, and the cutting device on the cutting device will generate a large amount of sparks when rotating and cutting the steel bars, and the high-temperature sparks will splash, which will bring safety hazards to the surrounding construction workers. If the processing is not carried out on site, the cutting situation cannot be observed in the first time, so it needs to be improved. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a steel bar cutting device for construction, which can automatically close the first protective cover and the second protective cover when cutting the steel bar, and automatically open them after the cutting is completed to avoid the safety hazards caused by sparks. At the same time, the cutting situation can be observed in real time through the setting of the glass plate.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is a steel bar cutting device for construction, comprising:

[0005] A support seat, wherein a cutting opening is formed in the middle of the support seat;

[0006] a support assembly for supporting the steel bars, the support assembly being located above the cutting opening and longitudinally spanning the cutting opening, and the support assembly being connected to the top of the support seat;

[0007] a first protective cover and a second protective cover located on opposite sides of the cutting opening and the support assembly, the first protective cover and the second protective cover being laterally openably connected to the top of the support base, a notch being provided on a side of the first protective cover and the second protective cover that are relatively close to each other for avoiding the support assembly, and a cutting space being formed between the first protective cover and the second protective cover when the first protective cover and the second protective cover are in a closed state;

[0008] A cutting assembly for cutting steel bars, wherein the cutting assembly is movably arranged in the cutting space along an opening and closing direction;

[0009] a driving member for driving the first protective cover and the cutting assembly to move synchronously along the opening and closing direction, the driving member being fixed to the support seat, and an output end of the driving member being connected to the cutting assembly;

[0010] A linkage member is used to link the second protective cover to move relatively along the opening and closing direction when the first protective cover moves along the opening and closing direction, and the linkage member is movably connected between the first protective cover and the second protective cover.

[0011] A further improvement of the steel bar cutting device for construction of the present invention is that a waste box for receiving cutting waste is connected to the bottom of the support seat, and an opening is provided on the top of the waste box, which is opposite to the cutting opening.

[0012] A further improvement of the steel bar cutting device for construction of the present invention is that the driving member comprises:

[0013] a fixing base connected to the top of the supporting base and located on a side of the first protective cover facing away from the second protective cover;

[0014] A cylinder is arranged in a transverse direction, wherein the main body of the cylinder is connected to the fixing seat, a first through hole is formed on the first protective cover, and an output end of the cylinder passes through the first through hole and is connected to the cutting assembly;

[0015] A spring for driving the first protective cover to move is sleeved on the cylinder, with one end of the spring connected to the output end of the cylinder and the other end connected to the inner wall of the first protective cover.

[0016] A further improvement of the steel bar cutting device for construction of the present invention is that a first sliding rod is vertically connected to one side of the first protective cover, and a first through groove is horizontally opened on the upper edge of the support seat for the first sliding rod to pass through and slide; a second sliding rod is vertically connected to one side of the second protective cover, and a second through groove is horizontally opened on the upper edge of the support seat for the second sliding rod to pass through and slide; the first sliding rod and the second sliding rod are located on the same side.

[0017] A further improvement of the steel bar cutting device for construction of the present invention is that the linkage member comprises:

[0018] A first connecting plate and a second connecting plate are arranged in the longitudinal direction, wherein a first end of the first connecting plate is connected to the bottom of the first sliding rod, a first end of the second connecting plate is connected to the bottom of the second sliding rod, a first sliding groove is longitudinally defined at the second end of the first connecting plate, a first end of the first sliding groove is relatively close to the first sliding rod, a second end of the first sliding groove is relatively far from the first sliding rod, and a slot is defined at the first end of the second connecting plate;

[0019] A rotating plate is used to adaptively push and pull the second connecting plate, and both ends of the rotating plate are respectively connected to a first slider and an insertion rod, the first slider is slidably connected in the first slide groove, and the insertion rod is inserted and rotatably connected in the slot, and the length of the rotating plate satisfies that in the separation limit state of the first protective cover and the second protective cover, the first slider is located at the first end of the first slide groove, and in the abutment state of the first protective cover and the second protective cover, the first slider is located at the second end of the first slide groove.

[0020] A further improvement of the steel bar cutting device for construction of the present invention is that a transparent window for observing the steel bar cutting situation in the cutting space is provided on a side of the second protective cover relatively far away from the first protective cover.

[0021] A further improvement of the steel bar cutting device for construction of the present invention is that a cleaning component for wiping the inside of the transparent window is connected to the inner side of the second protective cover, comprising:

[0022] Two driven racks are located on the inner side of the second protective cover and are arranged parallel to each other in an upper and lower direction, and the two driven racks are connected to the inner wall of the second protective cover in a longitudinal sliding manner;

[0023] a driving gear for driving the two driven racks to slide, the driving gear being meshed and connected between the two driven racks, one end of the driving gear being connected to a connecting rod, the connecting rod extending out of the second protective cover and forming an extension section, the extension section being connected to a knob for rotation, and the second protective cover being provided with a second through hole for the connecting rod to pass through;

[0024] Two cleaning bars, both of which are pressed against the transparent window, are respectively connected to the two driven racks through connecting frames, and are adapted to the transparent window.

[0025] A further improvement of the steel bar cutting device for construction of the present invention is that a limiter for limiting the rotation of the knob is connected to the outer side of the second protective cover, and the knob is a rotating gear, and the limiter includes:

[0026] a connecting block, the connecting block being located on one side of the knob and connected to the outer side wall of the second protective cover;

[0027] A screw rod, the screw rod is screwed to the connecting block, and the connecting block is provided with a threaded hole for the screw rod to pass through;

[0028] A card plate is rotatably connected to an end of the screw rod relatively close to the knob, and a side of the card plate facing away from the screw rod is connected to a limiting tooth, and the limiting tooth is adapted to the knob.

[0029] A further improvement of the steel bar cutting device for construction of the present invention is that the support assembly includes two L-shaped support rods, the vertical rods of the two L-shaped support rods are respectively located on both sides of the cutting opening and connected to the top of the support seat, the cross rods of the two L-shaped support rods are arranged opposite to each other and located above the cutting opening, the tops of the cross rods of the two L-shaped support rods jointly form a support groove for placing the steel bars, and a gap for the cutting assembly to pass through is formed between the cross rods of the two L-shaped support rods.

[0030] Compared with the prior art, the advantages of the present invention are:

[0031] 1. By setting up the first and second protective covers that can be opened and closed, the safety hazard caused by sparks flying when cutting steel bars can be avoided.

[0032] 2. By setting up a transparent window, it is convenient to observe the steel bar cutting situation in real time;

[0033] 3. By setting up a cleaning component, it is easy to wipe the inside of the transparent window to prevent cutting waste from being contaminated on the inside of the transparent window and affecting observation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 This is a structural front view of the steel bar cutting device for construction use according to the present invention.

[0036] Figure 2 This is a first cross-sectional view of the steel bar cutting device for construction use according to the present invention.

[0037] Figure 3 This is a second cross-sectional view of the steel bar cutting device for construction use according to the present invention.

[0038] Figure 4 for Figure 3 Detailed drawings of the .

[0039] Figure 5 This is a detailed structural diagram of the linkage components of the steel bar cutting device for construction use according to the present invention.

[0040] Figure 6 This is a detailed view of the inner side of the second protective cover of the steel bar cutting device for construction construction of the present invention.

[0041] Figure 7 Detailed diagram of the cleaning component of the steel bar cutting device for construction use according to the present invention.

[0042] In the figure: 1. support base; 2. first protective cover; 3. second protective cover; 4. steel bar; 5. driving part; 501. fixed base; 502. cylinder; 503. spring; 6. transparent window; 7. cleaning assembly; 701. driven rack; 702. driving gear; 703. cleaning bar; 704. connecting frame; 705. knob; 706. connecting block; 707. screw rod; 708. clamping plate; 8. support assembly; 801. L-shaped support rod; 802. conveying wheel; 9. second slide bar; 10. second through slot; 11. waste box; 12. notch; 13. cutting opening; 14. cutting assembly; 15. first slide bar; 16. first connecting plate; 17. second connecting plate; 18. first slide slot; 19. slot; 20. rotating plate; 21. first slider; 22. insertion rod. DETAILED DESCRIPTION

[0043] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0044] The steel bar cutting device for construction of the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0045] See also Figures 1 to 7 As shown, the steel bar cutting device for construction includes:

[0046] A support base 1, wherein a cutting opening 13 is formed in the middle of the support base 1;

[0047] A support assembly 8 for supporting the steel bar 4, the support assembly 8 being located above the cutting opening 13 and longitudinally spanning the cutting opening 13, and the support assembly 8 being connected to the top of the support base 1;

[0048] The first protective cover 2 and the second protective cover 3 are located on opposite sides of the cutting opening 13 and the support assembly 8. The first protective cover 2 and the second protective cover 3 are connected to the top of the support base 1 in a transversely openable and closable manner. A notch 12 is provided on the side of the first protective cover 2 and the second protective cover 3 that is relatively close to each other to avoid the support assembly 8. When the first protective cover 2 and the second protective cover 3 are in a closed state, a cutting space is formed between the first protective cover 2 and the second protective cover 3.

[0049] A cutting assembly 14 for cutting the steel bars 4, the cutting assembly 14 being movably disposed in the cutting space along an opening and closing direction;

[0050] a driving member 5 for driving the first protective cover 2 and the cutting assembly 14 to move synchronously along the opening and closing direction, wherein the driving member 5 is fixed to the support base 1, and an output end of the driving member 5 is connected to the cutting assembly 14;

[0051] A linkage member is used to link the second protective cover 3 to move relatively along the opening and closing direction when the first protective cover 2 moves along the opening and closing direction. The linkage member is movably connected between the first protective cover 2 and the second protective cover 3.

[0052] Preferably, a waste box 11 for receiving cutting waste is connected to the bottom of the support base 1 , and an opening is provided on the top of the waste box 11 , and the opening is opposite to the cutting opening 13 .

[0053] By providing the waste box 11 , after the cutting assembly 14 cuts the steel bar 4 , waste will automatically fall from the cutting opening 13 into the waste box 11 .

[0054] Preferably, the driving member 5 includes:

[0055] A fixing base 501 connected to the top of the support base 1 and located on a side of the first protective cover 2 facing away from the second protective cover 3;

[0056] A cylinder 502 is disposed in a transverse direction, wherein the main body of the cylinder 502 is connected to the fixing base 501 , and a first through hole is formed in the first protective cover 2 , through which the output end of the cylinder 502 passes and is connected to the cutting assembly 14 ;

[0057] The spring 503 is used to drive the first protective cover 2 to move. The spring 503 is sleeved on the cylinder 502 , and one end of the spring 503 is connected to the output end of the cylinder 502 , and the other end is connected to the inner wall of the first protective cover 2 .

[0058] When the cylinder 502 is in the extended state, the cylinder 502 drives the cutting assembly 14 to move together, and the spring 503 pulls the first protective cover 2 to move together.

[0059] Specifically, the cutting assembly 14 includes a rotary cutter and a drive motor for driving the rotary cutter. Both the rotary cutter and the drive motor are connected to the output end of the cylinder 502 .

[0060] Preferably, a first slide bar 15 is vertically connected to one side of the first protective cover 2, and a first through groove is horizontally opened on the upper edge of the support seat 1 for the first slide bar 15 to pass through and slide. A second slide bar 9 is vertically connected to one side of the second protective cover 3, and a second through groove 10 is horizontally opened on the upper edge of the support seat 1 for the second slide bar 9 to pass through and slide. The first slide bar 15 and the second slide bar 9 are located on the same side.

[0061] By providing the first sliding rod 15 , the first through slot, the second sliding rod 9 and the second through slot 10 , the sliding stability of the first protective cover 2 and the second anti-slip cover is improved.

[0062] Preferably, the linkage comprises:

[0063] A first connecting plate 16 and a second connecting plate 17 are arranged longitudinally, wherein a first end of the first connecting plate 16 is connected to the bottom of the first slide bar 15, and a first end of the second connecting plate 17 is connected to the bottom of the second slide bar 9. A first sliding groove 18 is longitudinally defined at the second end of the first connecting plate 16, wherein a first end of the first sliding groove 18 is relatively close to the first slide bar 15, and a second end of the first sliding groove 18 is relatively far from the first slide bar 15. A slot 19 is defined at the first end of the second connecting plate 17;

[0064] The rotating plate 20 is used to adaptively push and pull the second connecting plate 17. The two ends of the rotating plate 20 are respectively connected to a first slider 21 and an insertion rod 22. The first slider 21 is slidably connected to the first slide groove 18, and the insertion rod 22 is inserted and rotatably connected to the slot 19. The length of the rotating plate 20 satisfies that when the first protective cover 2 and the second protective cover 3 are in the separation limit state, the first slider 21 is located at the first end of the first slide groove 18, and when the first protective cover 2 and the second protective cover 3 are in the abutting state, the first slider 21 is located at the second end of the first slide groove 18.

[0065] When it is necessary to cut the steel bars 4, the cylinder 502 drives the first protective cover 2 to move toward the second protective cover 3. At this time, the rotating plate 20 starts to rotate, and the first slider 21 slides from the first end to the second end of the first slide groove 18. Then the rotating plate 20 will pull the second protective cover 3 toward the first protective cover 2 until the first protective cover 2 and the second protective cover 3 are closed.

[0066] Preferably, a transparent window 6 for observing the cutting condition of the steel bars 4 in the cutting space is provided on a side of the second protective cover 3 relatively away from the first protective cover 2 .

[0067] By providing the transparent window 6, the cutting condition of the steel bar 4 can be observed in real time while the cutting is closed, thereby improving the practicality.

[0068] Preferably, the inner side of the second protective cover 3 is connected to a cleaning assembly 7 for wiping the inner side of the transparent window 6, comprising:

[0069] Two driven racks 701 are located on the inner side of the second protective cover 3 and are spaced apart from each other in parallel. The two driven racks 701 are both slidably connected to the inner wall of the second protective cover 3 in the longitudinal direction.

[0070] A driving gear 702 for driving the two driven racks 701 to slide, the driving gear 702 being meshed and connected between the two driven racks 701, one end of the driving gear 702 being connected to a connecting rod, the connecting rod extending out of the second protective cover 3 and forming an extension section, the extension section being connected to a knob 705 for rotation, and the second protective cover 3 being provided with a second through hole for the connecting rod to pass through;

[0071] Two cleaning bars 703 , both of which are in contact with the transparent window 6 , are connected to the two driven racks 701 via connecting frames 704 , and are adapted to the transparent window 6 .

[0072] By providing the cleaning assembly 7 , it is convenient to wipe the inner side of the transparent window 6 , thereby preventing cutting waste from being stained on the inner side of the transparent window 6 and affecting observation.

[0073] By rotating the driving gear 702 , the two driven racks 701 are driven to move toward or away from each other. The two driven racks 701 drive the two cleaning bars 703 to move back and forth against the transparent window 6 to wipe the inner side of the transparent window 6 .

[0074] Specifically, two second sliding grooves for the two driven racks 701 to slide are provided on the inner wall of the second protective cover 3 at intervals, and the driven racks 701 are connected to second sliding blocks adapted to the second sliding grooves.

[0075] Specifically, the second sliding groove is a dovetail groove, and the second sliding block is adapted to the dovetail groove.

[0076] By limiting the second sliding groove to a dovetail groove, an anti-slip effect is achieved, thereby preventing the driven rack 701 from falling off.

[0077] Preferably, a limiter is connected to the outer side of the second protective cover 3 for limiting the rotation of the knob 705. The knob 705 is a rotating gear. The limiter includes:

[0078] a connecting block 706 , which is located on one side of the knob 705 and connected to the outer side wall of the second protective cover 3 ;

[0079] A screw rod 707 is screwed to the connecting block 706 , and a threaded hole is formed in the connecting block 706 for the screw rod 707 to pass through;

[0080] The card plate 708 is rotatably connected to one end of the screw rod 707 relatively close to the knob 705 . The side of the card plate 708 facing away from the screw rod 707 is connected to a limiting tooth, and the limiting tooth is adapted to the knob 705 .

[0081] By rotating the screw rod 707 , the clamping plate 708 is controlled to move toward the knob 705 until the clamping plate 708 is engaged with the knob 705 , thereby limiting the rotation of the knob 705 .

[0082] Specifically, a bearing is connected between the clamping plate 708 and the screw rod 707 .

[0083] By providing the bearing, the clamping plate 708 is prevented from rotating along with the rotation of the screw rod 707 , thereby preventing the clamping connection between the clamping plate 708 and the knob 705 from being affected.

[0084] Preferably, the support assembly 8 includes two L-shaped support rods 801, the vertical rods of the two L-shaped support rods 801 are respectively located on both sides of the cutting opening 13 and connected to the top of the support seat 1, the horizontal rods of the two L-shaped support rods 801 are arranged opposite to each other and located above the cutting opening 13, and the tops of the horizontal rods of the two L-shaped support rods 801 jointly form a support groove for the steel bars 4 to be placed, and a gap is formed between the horizontal rods of the two L-shaped support rods 801 for the cutting assembly 14 to pass through.

[0085] The gap is formed by spacing the two L-shaped support rods 801 apart, so that the cutting assembly 14 can be convenient for cutting.

[0086] Specifically, a conveying wheel 802 for controlling the movement of the steel bar 4 is connected to the support groove.

[0087] By providing the conveying wheel 802 , the movement of the steel bar 4 can be controlled until the point to be cut of the steel bar 4 moves to the gap, so that the cutting assembly 14 can start cutting.

[0088] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology, and are not used to limit the conditions for implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0089] The above description is merely 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 profession can make some changes or modifications to equivalent embodiments of the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A steel bar cutting device for construction, characterized in that: include: A support seat, wherein a cutting opening is formed in the middle of the support seat; a support assembly for supporting the steel bars, the support assembly being located above the cutting opening and longitudinally spanning the cutting opening, and the support assembly being connected to the top of the support seat; a first protective cover and a second protective cover located on opposite sides of the cutting opening and the support assembly, the first protective cover and the second protective cover being laterally openably connected to the top of the support base, a notch being provided on a side of the first protective cover and the second protective cover that are relatively close to each other for avoiding the support assembly, and a cutting space being formed between the first protective cover and the second protective cover when the first protective cover and the second protective cover are in a closed state; A cutting assembly for cutting steel bars, wherein the cutting assembly is movably disposed in the cutting space along an opening and closing direction; a driving member for driving the first protective cover and the cutting assembly to move synchronously along the opening and closing direction, the driving member being fixed to the support seat, and an output end of the driving member being connected to the cutting assembly; The linkage member is used to link the second protective cover to move relatively in the opening and closing direction when the first protective cover moves in the opening and closing direction, the linkage member is movably connected between the first protective cover and the second protective cover, one side of the first protective cover is vertically connected to the first sliding bar, the upper edge of the support seat is provided with a first through slot for the first sliding bar to pass through and slide, the upper edge of the second protective cover is vertically connected to the second sliding bar, the upper edge of the support seat is provided with a second through slot for the second sliding bar to pass through and slide, the first sliding bar and the second sliding bar are located on the same side, and the linkage member includes: A first connecting plate and a second connecting plate are arranged in the longitudinal direction, wherein a first end of the first connecting plate is connected to the bottom of the first sliding rod, a first end of the second connecting plate is connected to the bottom of the second sliding rod, a first sliding groove is longitudinally defined at the second end of the first connecting plate, a first end of the first sliding groove is relatively close to the first sliding rod, a second end of the first sliding groove is relatively far from the first sliding rod, and a slot is defined at the first end of the second connecting plate; A rotating plate is used to adaptively push and pull the second connecting plate, and both ends of the rotating plate are respectively connected to a first slider and an insertion rod, the first slider is slidably connected in the first slide groove, and the insertion rod is inserted and rotatably connected in the slot, and the length of the rotating plate satisfies that in the separation limit state of the first protective cover and the second protective cover, the first slider is located at the first end of the first slide groove, and in the abutment state of the first protective cover and the second protective cover, the first slider is located at the second end of the first slide groove.

2. The steel bar cutting device for construction as claimed in claim 1, characterized in that: The bottom of the support seat is connected to a waste box for receiving cutting waste, and the top of the waste box is provided with an opening, which is directly opposite to the cutting opening.

3. The steel bar cutting device for construction as claimed in claim 1, characterized in that: The driving member includes: a fixing base connected to the top of the supporting base and located on a side of the first protective cover facing away from the second protective cover; A cylinder is arranged in a transverse direction, wherein the main body of the cylinder is connected to the fixing seat, a first through hole is formed on the first protective cover, and an output end of the cylinder passes through the first through hole and is connected to the cutting assembly; A spring for driving the first protective cover to move is sleeved on the cylinder, with one end of the spring connected to the output end of the cylinder and the other end connected to the inner wall of the first protective cover.

4. The steel bar cutting device for construction as claimed in claim 1, characterized in that: A transparent window for observing the cutting condition of the steel bars in the cutting space is provided on a side of the second protective cover relatively far away from the first protective cover.

5. The steel bar cutting device for construction as claimed in claim 4, characterized in that: The inner side of the second protective cover is connected to a cleaning component for wiping the inner side of the transparent window, including: Two driven racks are located on the inner side of the second protective cover and are arranged parallel to each other in an upper and lower direction, and the two driven racks are connected to the inner wall of the second protective cover in a longitudinal sliding manner; a driving gear for driving the two driven racks to slide, the driving gear being meshed and connected between the two driven racks, one end of the driving gear being connected to a connecting rod, the connecting rod extending out of the second protective cover and forming an extension section, the extension section being connected to a knob for rotation, and the second protective cover being provided with a second through hole for the connecting rod to pass through; Two cleaning bars, both of which are pressed against the transparent window, are respectively connected to the two driven racks through connecting frames, and are adapted to the transparent window.

6. The steel bar cutting device for construction as claimed in claim 5, characterized in that: The outer side of the second protective cover is connected to a limiter for limiting the rotation of the knob, the knob is a rotating gear, and the limiter includes: a connecting block, the connecting block being located on one side of the knob and connected to the outer side wall of the second protective cover; A screw rod, the screw rod is screwed to the connecting block, and the connecting block is provided with a threaded hole for the screw rod to pass through; A card plate is rotatably connected to an end of the screw rod relatively close to the knob, and a side of the card plate facing away from the screw rod is connected to a limiting tooth, and the limiting tooth is adapted to the knob.

7. The steel bar cutting device for construction as claimed in claim 1, characterized in that: The support assembly includes two L-shaped support rods, the vertical rods of the two L-shaped support rods are respectively located on both sides of the cutting opening and connected to the top of the support seat, the cross rods of the two L-shaped support rods are arranged opposite to each other and located above the cutting opening, the tops of the cross rods of the two L-shaped support rods jointly form a support groove for placing steel bars, and a gap for the cutting assembly to pass through is formed between the cross rods of the two L-shaped support rods.

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