Concrete cutting device

Abstract

The invention belongs to the technical field of building cutting, and particularly relates to a concrete cutting device which comprises a supporting frame, and a top plate is arranged at the top of the supporting frame; the cutting assembly is movably installed on the top plate, the cutting assembly comprises a shell, a cutting knife is installed in the shell, and a second lead screw used for driving the cutting assembly to move is rotationally installed on the upper portion of the supporting frame; the limiting assembly comprises a plurality of supporting rods arranged in parallel, limiting plates are symmetrically arranged on the two sides of the supporting rods in a sliding mode, and a first lead screw used for driving the limiting plates on the two sides to move synchronously is arranged in the middle of the supporting frame; the mud guard is arranged on the supporting rod in a sliding mode, and the mud guard moves synchronously along with the cutting assembly through a linkage assembly so as to stop splashing chippings generated when the cutting knife cuts the concrete block; the splash guard is arranged to prevent chippings from splashing, the chippings are prevented from flying around, and therefore the cleaning difficulty is lowered.

Description

Technical Field

[0001] The present invention belongs to the technical field of building cutting, and specifically relates to a concrete cutting device. Background Art

[0002] Aerated concrete blocks are a new type of building material that is lightweight, porous, has good heat insulation and fire resistance, and can be nailed, sawed, planed, and has a certain seismic resistance. They are widely used in various buildings. In specific applications, aerated concrete blocks need to be cut into various sizes suitable for use.

[0003] A patent of patent application CN112847849B discloses a building aerated concrete block cutting device. The key points of its technical solution are: including a bracket, a cutting device is provided on the bracket; the cutting device includes a cutting mechanism and a moving component that can place the aerated concrete block to move reciprocally relative to the cutting mechanism. An angle adjustment mechanism for adjusting the angle between the aerated concrete block and the cutting direction is provided on the moving component; the angle adjustment mechanism includes an angle measurement component that abuts and fixes against the angle to be measured and then replicates its angle, a positioning component that uses the angle measurement component for auxiliary fixation and then forms the same angle as the cutting mechanism, and an auxiliary component that provides support for the aerated concrete block by sliding and abutting. The technical effect is that it is convenient and accurate to perform irregular cutting on aerated concrete blocks.

[0004] However, the above technologies often have the following defects: during the cutting process of the above device, a large amount of debris is often generated, and these debris are easy to scatter and fly, which is not only difficult to collect, but also may cause pollution to the surrounding environment, affecting the cleanliness of the working environment and the safety of construction workers.

[0005] Therefore, the present invention provides a concrete cutting device. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art and solve at least one technical problem proposed in the background art.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a concrete cutting device of the present invention includes:

[0008] A support frame, a top plate is provided at the top of the support frame;

[0009] A cutting component, the cutting component is movably installed on the top plate. The cutting component includes a housing, a cutting knife is installed in the housing, and a second lead screw for driving the movement of the cutting component is rotatably installed on the upper part of the support frame;

[0010] A spray head, the spray head is fixed to the housing, and the spray head is connected to an external water source;

[0011] Limit component, the limit component includes a plurality of support rods arranged in parallel, the support rods are rotatably installed in the middle of the support frame, limit plates are symmetrically and slidably arranged on both sides of the support rods, a cutting groove is provided in the middle of the limit plates, and a first lead screw for driving the limit plates on both sides to move synchronously is arranged in the middle of the support frame;

[0012] Fender, the fender is slidably arranged on the support rod, and the fender follows the cutting component to move synchronously through the linkage component to block the flying debris when the cutting knife cuts the concrete block;

[0013] Collection tray, the collection tray is arranged below the support rod.

[0014] Preferably, the linkage component includes a hook rod, the hook rod is installed on the housing, the fender can be driven to move through the hook rod, a sliding cavity is provided on the housing, the hook rod is slidably arranged inside the sliding cavity, and a second spring is fixed inside the sliding cavity.

[0015] Preferably, a rectangular hole is provided in the middle of the side wall of the support frame, a movable rod is slidably installed in the rectangular hole, the movable rod is connected to the fender through a connecting component, a cavity is provided in the middle of the movable rod, an impact rod is movably installed inside one end of the movable rod close to the fender, through grooves are provided on both the upper and lower sides of the movable rod, a movable plate is slidably installed in the through grooves, the impact rod is fixed on the side wall of the movable plate, and a first spring is provided in the inner cavity of the other end of the movable rod away from the fender.

[0016] Preferably, the connecting component includes a connecting block fixed to the top of the movable rod, the connecting block is attached to the fender, and a connecting sleeve sleeved with the connecting block is fixed on the side wall of the fender.

[0017] Preferably, hydraulic cylinders are fixed on the outer walls on both sides of the support frame, and the telescopic end at the top of the hydraulic cylinder is fixed below the top plate.

[0018] Preferably, a chute is provided on the top plate, and the top end of the housing is slidably arranged inside the chute.

[0019] Preferably, a groove is provided at the relative position between the fender and the cutting knife.

[0020] Preferably, elastic membranes I are provided on both sides of the groove, an elastic membrane II is provided in the middle of the groove, both the elastic membrane I and the elastic membrane II are fixed on the inner wall of the groove, and both the elastic membrane I and the elastic membrane II form an arc-shaped bulge through coating on the inner wall of the groove, and air is provided inside the arc-shaped bulge.

[0021] Preferably, the two elastic membranes I are respectively communicated with the elastic membrane II through a connecting pipe. A sliding sleeve is fixed to the side wall of the fender. A push rod is hermetically and slidably installed in the middle of the sliding sleeve. One end of the push rod extends into the elastic membrane II. A spring III for resetting the push rod is installed inside the elastic membrane II. The other end of the push rod extends into the inner cavity of the movable rod.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. For the concrete cutting device of the present invention, a limiting component is provided to limit the concrete block. The concrete block is placed on the support rod. The concrete block can roll on the support rod, which is convenient for adjusting the relative position between the concrete block and the rotary cutting tool, so as to quickly determine the cutting position. In addition, it is convenient to remove the cut concrete block from the support rod, which is convenient for discharging. In addition, by providing a fender to block the flying debris, the flying of debris is avoided, thereby reducing the cleaning difficulty.

[0024] 2. For the concrete cutting device of the present invention, a groove is provided at the relative position between the fender and the cutting tool. By providing the groove, the flying range of the debris can be limited. When the debris contacts the inner wall of the groove, the flying direction of the debris will be restricted, so that the debris moves closer to the middle and is not easily dropped outside the support frame, polluting the surrounding environment. Description of the Drawings

[0025] The present invention will be further described below with reference to the drawings.

[0026] Figure 1 is a perspective view of the present invention;

[0027] Figure 2 is a front view of the present invention;

[0028] Figure 3 is Figure 2 the enlarged view at A in

[0029] Figure 4 is a partial structural schematic diagram of the present invention;

[0030] Figure 5 is Figure 4 the enlarged view at B in

[0031] Figure 6 is a top view cross-sectional view of the elastic membrane I and the elastic membrane II of the present invention.

[0032] In the figure: 1, support frame; 2, top plate; 3, housing; 4, cutting knife; 5, chute; 6, hydraulic cylinder; 7, mudguard; 8, support rod; 9, first lead screw; 10, limit plate; 11, collection tray; 12, second lead screw; 13, movable rod; 14, first spring; 15, hook rod; 16, second spring; 17, nozzle; 18, connecting block; 19, connecting sleeve; 20, impact rod; 21, movable plate; 22, cavity; 23, first elastic membrane; 24, second elastic membrane; 25, ejector rod; 26, sliding sleeve; 27, third spring. Detailed implementation manners

[0033] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0034] Example 1: As Figure 1 and Figure 2 shown, a concrete cutting device according to an embodiment of the present invention includes:

[0035] A support frame 1, with a top plate 2 provided at the top of the support frame 1;

[0036] A cutting assembly, the cutting assembly is movably installed on the top plate 2, the cutting assembly includes a housing 3, a cutting knife 4 is installed in the housing 3, a second lead screw 12 for driving the movement of the cutting assembly is rotatably installed on the upper part of the support frame 1, and the housing 3 is threadedly connected to the second lead screw 12;

[0037] A nozzle 17, the nozzle 17 is fixed to the housing 3, and the nozzle 17 is connected to an external water source;

[0038] A limiting assembly, the limiting assembly includes a plurality of support rods 8 arranged in parallel, the support rods 8 are rotatably installed in the middle of the support frame 1, limit plates 10 are symmetrically slidably arranged on both sides of the support rods 8, a cutting groove is provided in the middle of the limit plates 10, the cutting groove is lower than the support rods 8, a first lead screw 9 for driving the synchronous movement of the limit plates 10 on both sides is arranged in the middle of the support frame 1, and the limit plates 10 are threadedly connected to the first lead screw 9; the diameter of the first lead screw 9 is smaller than the diameter of the support rods 8, so that the concrete block will not interfere with the rotation of the first lead screw 9 when moving on the support rods 8;

[0039] A mudguard 7, the mudguard 7 is slidably arranged on the support rods 8, and the mudguard 7 follows the cutting assembly to move synchronously through a linkage assembly to block the flying debris when the cutting knife 4 cuts the concrete block;

[0040] A collection tray 11, the collection tray 11 is arranged below the support rods 8;

[0041] During operation, the device is moved to the designated position through the self-locking universal wheels at the bottom of the device. Then, the concrete block is placed on the support rod 8. The concrete block can roll on the support rod 8, facilitating the adjustment of the relative position between the concrete block and the rotary cutting tool 4, thereby quickly determining the cutting position. In addition, it is convenient to remove the cut concrete block from the support rod 8 for discharging.

[0042] After determining the cutting position, start the first motor outside the support frame 1. Drive the first lead screw 9 to rotate through the first motor. The first lead screw 9 is a bidirectional lead screw, so as to drive the two limit plates 10 to move closer to the middle at the same time to clamp and limit the concrete block. Then, start the second motor outside the support frame 1. Drive the second lead screw 12 to rotate through the second motor, and then drive the housing 3 and the cutting tool 4 to move horizontally. At the same time, start the drive motor of the cutting tool 4 to cut the concrete block with the cutting tool 4.

[0043] In addition, water is sprayed onto the cutting tool 4 through the nozzle 17. A large amount of frictional heat will be generated during the cutting process of the cutting tool 4. Spraying water can help take away this heat, thereby preventing the cutting tool 4 from overheating and avoiding excessive wear or damage of the tool; the water flow can reduce the friction between the cutting tool 4 and the material to be cut, reduce the resistance during the cutting process, make the cutting smoother, and at the same time reduce the burden on the equipment; and spraying water can also play a role in dust reduction, avoiding too much dust from affecting the operators.

[0044] During the cutting process, the debris contains moisture and needs to be collected to avoid adhering to other components and being difficult to clean. During collection, some debris falls into the lower collection tray 11 and is collected, and some debris is thrown to the side in a parabolic shape as the cutting tool 4 rotates. At this time, the mudguard 7 is used to block the splashing of the debris to avoid the random flying of the debris, thereby reducing the cleaning difficulty.

[0045] As Figure 2 shown, the linkage component includes a hook rod 15. The hook rod 15 is installed on the housing 3. The mudguard 7 can be driven to move through the hook rod 15. A sliding cavity is provided on the housing 3. The hook rod 15 is slidably arranged inside the sliding cavity. A second spring 16 is fixed inside the sliding cavity; during operation, the hook rod 15 is set in an L shape. The hook rod 15 is lapped on the top of the mudguard 7. When the housing 3 moves, the mudguard 7 is pulled to move synchronously through the hook rod 15, so that the mudguard 7 approaches the cutting tool 4 to timely block the splashing debris; when the mudguard 7 moves to contact the side of the concrete block, the housing 3 continues to move. At this time, the second spring 16 is stretched, and the position of the mudguard 7 remains unchanged, always blocking the debris.

[0046] As Figure 2As shown, a rectangular hole is provided in the middle of the side wall of the support frame 1. An active rod 13 is slidably installed in the rectangular hole. The active rod 13 is connected to the mudguard 7 through a connection component. A cavity 22 is provided in the middle of the active rod 13. An impact rod 20 is movably installed inside one end of the active rod 13 close to the mudguard 7. The impact rod 20 is an elastic rubber rod. Through slots are provided on both the upper and lower sides of the active rod 13. An active plate 21 is slidably installed in the through slots. The impact rod 20 is fixed to the side wall of the active plate 21. A first spring 14 is provided in the inner cavity of the end of the active rod 13 away from the mudguard 7;

[0047] During operation, the active rod 13 is adapted to the rectangular hole, and the movement direction of the mudguard 7 is restricted by the active rod 13. When the mudguard 7 moves along with the housing 3, the active rod 13 is pulled to move towards the inner side of the support frame 1. At this time, the active plate 21 and the second active plate are blocked outside the support frame 1, and the first spring 14 is compressed. At the same time, the impact rod 20 moves in a direction away from the mudguard 7. When the cutting task is completed, the top plate 2 is lifted to drive the housing 3 to move upward, thereby driving the hook rod 15 to disengage from the mudguard 7. Under the elastic return action of the first spring 14, the active rod 13 and the mudguard 7 are driven to move towards the outer side of the support frame 1. At the same time, the impact rod 20 moves towards the mudguard 7 and impacts on the side wall of the mudguard 7 under the action of inertia, so as to shake off the debris attached to the mudguard 7 and facilitate the automatic cleaning of the mudguard 7.

[0048] As Figure 3 shown, the connection component includes a connection block 18 fixed to the top of the active rod 13. The connection block 18 is attached to the mudguard 7. A connection sleeve 19 sleeved with the connection block 18 is fixed to the side wall of the mudguard 7; the bottom of the mudguard 7 is provided with a U-shaped card slot for clamping on the support rod 8; during operation, by lifting the mudguard 7 upward, the connection sleeve 19 on the mudguard 7 can be separated from the connection block 18, so as to remove the mudguard 7 for convenient cleaning; in addition, the bottom of the mudguard 7 is clamped on the support rod 8. When the mudguard 7 moves along the support rod 8, the debris attached to the support rod 8 can be cleaned synchronously.

[0049] As Figure 2 shown, hydraulic cylinders 6 are fixed on the outer walls of both sides of the support frame 1. The telescopic ends at the tops of the hydraulic cylinders 6 are fixed below the top plate 2; during operation, the hydraulic cylinders 6 can control the up and down movement of the top plate 2 to control the lapping or separation of the hook rod 15 and the mudguard 7.

[0050] As Figure 1 shown, a chute 5 is provided on the top plate 2. The top end of the housing 3 is slidably arranged inside the chute 5; during operation, the chute 5 is provided to restrict the movement direction of the housing 3, so that the housing 3 can only move linearly along the chute 5.

[0051] As Figure 5As shown in the figure, a groove is provided at the relative position between the fender 7 and the cutting blade 4. During operation, when irregular debris collides with the fender 7, the debris may rebound in all directions. By providing the groove, the splashing range of the debris can be restricted. When the debris contacts the inner wall of the groove, the splashing direction of the debris will be restricted. Through the rebounding effect, the debris will move closer to the middle and is not likely to fall outside the support frame 1, polluting the surrounding environment.

[0052] As Figure 5 shown in the figure, elastic membranes 23 are provided on both sides of the groove, and an elastic membrane 24 is provided in the middle of the groove. The elastic membranes 23 and 24 are both fixed to the inner wall of the groove, and the elastic membranes 23 and 24 form an arc-shaped bulge on the inner wall of the groove by wrapping, and air is provided inside the arc-shaped bulge. During operation, the air inside the elastic membranes 23 and 24 is insufficiently filled to reduce the elasticity of the elastic membranes 23 and 24. The elastic membranes 23 and 24 buffer the debris, so that the debris is not easily rebounded when hitting the elastic membranes 23 and 24.

[0053] Embodiment 2: As Figure 6 shown in the figure, compared with Embodiment 1, another implementation method of the present invention is as follows: the elastic membranes 23 on both sides are respectively communicated with the elastic membrane 24 through a connecting pipe. A sliding sleeve 26 is fixed on the side wall of the fender 7. A push rod 25 is hermetically and slidably installed in the middle of the sliding sleeve 26. One end of the push rod 25 extends into the elastic membrane 24. A spring 27 for resetting the push rod 25 is installed inside the elastic membrane 24. The other end of the push rod 25 extends into the inner cavity of the movable rod 13. During operation, after cutting is completed, during the reset process of the fender 7, when the impact rod 20 hits the side wall of the fender 7, the impact rod 20 first pushes the push rod 25 to move towards the inside of the elastic membrane 24. The push rod 25 pushes the elastic membrane 24 to expand outwards, thereby absorbing the air in the elastic membranes on both sides, so that the volume of the elastic membranes on both sides is reduced. Then, when the impact rod 20 contacts the side wall of the fender 7, the impact rod 20 is rebounded and separated from the fender 7. The spring 27 pushes the push rod 25 to move outwards. At this time, the elastic membranes 23 and 24 gradually recover, and the internal air starts to transfer, so that the elastic membranes 23 and 24 continuously vibrate to shake off the debris attached to the surfaces of the elastic membranes 23 and 24, facilitating the cleaning of the debris.

[0054] Working principle: Place the concrete block on the support rod 8, adjust the relative position between the concrete block and the rotary cutting tool 4, start the first motor outside the support frame 1, drive the first lead screw 9 to rotate through the first motor, drive the two limit plates 10 to move closer to the middle at the same time, clamp and limit the concrete block, and then start the second motor outside the support frame 1, drive the second lead screw 12 to rotate through the second motor, and then drive the housing 3 and the cutting tool 4 to move horizontally. At the same time, start the drive motor of the cutting tool 4 and use the cutting tool 4 to cut the concrete block;

[0055] During the cutting process, sprinkle water on the cutting tool 4 through the nozzle 17 to cool down the cutting tool 4, and it can also play a role in dust reduction to avoid the impact of too much dust on the operators; some debris is thrown to the side in a parabolic shape as the cutting tool 4 rotates. At this time, block the flying debris with the mudguard 7 to avoid the random flying of debris, thereby reducing the cleaning difficulty;

[0056] When the housing 3 moves, pull the mudguard 7 to move synchronously through the hook rod 15, so that the mudguard 7 is close to the cutting tool 4 to timely block the flying debris; when the mudguard 7 moves to contact the side of the concrete block, the housing 3 continues to move. At this time, the second spring 16 is stretched, and the position of the mudguard 7 remains unchanged, always blocking the debris;

[0057] When the cutting task is completed, lift the top plate 2 through the hydraulic cylinder 6, drive the housing 3 to move upward, and then drive the hook rod 15 to disengage from the mudguard 7. Under the elastic return action of the first spring 14, drive the movable rod 13 and the mudguard 7 to move towards the outside of the support frame 1. At the same time, the impact rod 20 moves closer to the mudguard 7 and impacts on the side wall of the mudguard 7 under the action of inertia, so as to shake off the debris attached to the mudguard 7 and facilitate the automatic cleaning of the mudguard 7;

[0058] By setting the groove, the range of debris splashing can be restricted. When the debris contacts the inner wall of the groove, the splashing direction of the debris will be restricted, causing the debris to move closer to the middle and making it less likely to fall outside the support frame 1 and pollute the surrounding environment. Moreover, an elastic film 23 and an elastic film 24 are provided on the inner wall of the groove. The air filling inside the elastic film 23 and the elastic film 24 is insufficient to reduce the elasticity of the elastic film 23 and the elastic film 24. The elastic film 23 and the elastic film 24 buffer the debris, so that when the debris impacts the elastic film 23 and the elastic film 24, it is not easily rebounded. During the reset process of the fender 7, when the impact rod 20 hits the side wall of the fender 7, the impact rod 20 first pushes the ejector rod 25 to move towards the inside of the elastic film 24. The ejector rod 25 pushes the elastic film 24 to expand outwards, thereby absorbing the air in the elastic films on both sides to reduce the volume of the elastic films on both sides. After that, when the impact rod 20 contacts the side wall of the fender 7, the impact rod 20 is rebounded and separated from the fender 7. The spring three pushes the ejector rod 25 to move outwards. At this time, the elastic film 23 and the elastic film 24 gradually recover, and the internal air begins to transfer, so that the elastic film 23 and the elastic film 24 continuously vibrate to shake off the debris attached to the surfaces of the elastic film 23 and the elastic film 24, facilitating the cleaning of the debris.

[0059] The above front, back, left, right, up, and down are all based on the Figure 1 in the specification drawings. Taking the perspective of the person observing as the standard, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0060] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. It is 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 a limitation on the protection scope of the present invention.

[0061] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A concrete cutting device, characterized in that: include: A support frame (1), wherein a top plate (2) is provided on the top of the support frame (1); A cutting assembly, the cutting assembly is movably mounted on the top plate (2), the cutting assembly comprises a housing (3), a cutting knife (4) is mounted in the housing (3), and a screw rod (12) for driving the cutting assembly to move is rotatably mounted on the upper part of the support frame (1); A spray head (17), wherein the spray head (17) is fixed on the housing (3), and the spray head (17) is connected to an external water source; A limit assembly, the limit assembly comprising a plurality of support rods (8) arranged in parallel, the support rods (8) being rotatably mounted in the middle of a support frame (1), limit plates (10) being symmetrically slidably arranged on both sides of the support rods (8), a cutting groove being arranged in the middle of the limit plates (10), and a screw rod (9) being arranged in the middle of the support frame (1) for driving the limit plates (10) on both sides to move synchronously; A mud guard (7), wherein the mud guard (7) is slidably arranged on the support rod (8), and the mud guard (7) moves synchronously with the cutting assembly through a linkage assembly to block debris splashed when the cutting knife (4) cuts the concrete block; A collecting tray (11), wherein the collecting tray (11) is arranged below the supporting rod (8).

2. A concrete cutting device according to claim 1, characterized in that: The linkage assembly comprises a hook rod (15), the hook rod (15) being mounted on the housing (3), and the fender (7) being driven to move by the hook rod (15), the housing (3) being provided with a sliding cavity, the hook rod (15) being slidably arranged inside the sliding cavity, and a spring 2 (16) being fixed inside the sliding cavity.

3. A concrete cutting device according to claim 1, characterized in that: A rectangular hole is provided in the middle of the side wall of the support frame (1), a movable rod (13) is slidably installed in the rectangular hole, the movable rod (13) is connected to the fender (7) through a connecting assembly, a cavity (22) is provided in the middle of the movable rod (13), an impact rod (20) is movably installed inside the end of the movable rod (13) close to the fender (7), through grooves are provided on the upper and lower sides of the movable rod (13), a movable plate (21) is slidably installed in the through groove, the impact rod (20) is fixed on the side wall of the movable plate (21), and a spring (14) is provided in the inner cavity of the end of the movable rod (13) away from the fender (7).

4. A concrete cutting device according to claim 3, characterized in that: The connection assembly comprises a connection block (18) fixed to the top of the movable rod (13); the connection block (18) is fitted with the fender (7); and a connection sleeve (19) sleeved with the connection block (18) is fixed to the side wall of the fender (7).

5. A concrete cutting device according to claim 1, characterized in that: Hydraulic cylinders (6) are fixed on both side outer walls of the support frame (1), and the top telescopic end of the hydraulic cylinder (6) is fixed below the top plate (2).

6. A concrete cutting device according to claim 1, characterized in that: The top plate (2) is provided with a slide groove (5), and the top end of the shell (3) is slidably arranged inside the slide groove (5).

7. A concrete cutting device according to claim 1, characterized in that: A groove is provided at a position opposite to the fender (7) and the cutting knife (4).

8. A concrete cutting device according to claim 7, characterized in that: Elastic membranes 1 (23) are provided on both sides of the groove, and elastic membranes 2 (24) are provided in the middle of the groove. The elastic membranes 1 (23) and 2 (24) are both fixed on the inner wall of the groove, and the elastic membranes 1 (23) and 2 (24) are wrapped on the inner wall of the groove to form an arc-shaped bulge, and air is provided inside the arc-shaped bulge.

9. A concrete cutting device according to claim 8, characterized in that: The elastic membranes 1 (23) on both sides are connected to the elastic membranes 2 (24) through connecting pipes, and a sliding sleeve (26) is fixed to the side wall of the fender (7). A push rod (25) is installed in the middle of the sliding sleeve (26) in a sealing and sliding manner. One end of the push rod (25) extends into the interior of the elastic membrane 2 (24). A spring 3 (27) for returning the push rod (25) is installed inside the elastic membrane 2 (24). The other end of the push rod (25) extends into the inner cavity of the movable rod (13).

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