A concrete spraying machine for civil engineering

Abstract

This invention relates to the field of civil engineering technology and provides a concrete spraying machine for civil engineering, including a concrete spraying machine body. By setting a distance-limiting guide component on the outer periphery of the spraying head, when the spraying head approaches the steel mesh or construction surface, the distance-limiting rollers can first contact and roll to guide it, thereby maintaining a relatively stable predetermined distance between the spraying outlet and the construction surface. This reduces the problems of uneven spraying layer and increased rebound caused by inconsistent spraying distance and skewed spraying angle when manually spraying. The adjustable distance-limiting guide component can adjust the forward extension distance of the distance-limiting component to adapt to different spraying thicknesses and construction surface conditions, improving applicability. At the same time, the anti-rebound cover and the outer wall of the spraying head form an annular rebound buffer cavity, which can guide some of the rebound material to the outside and downward, avoiding its direct impact on the spraying outlet, thereby reducing the risk of spraying head blockage, wear, and unstable spraying.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, and in particular to a concrete spraying machine for civil engineering. Background Technology

[0002] Concrete spraying machines are suitable for applications such as initial support of tunnels, slope protection of foundation pits, support of mine roadways, and repair of the sidewalls of underground utility tunnels. During construction, the reinforcing mesh or hanging mesh is usually pre-fixed to the rock surface, slope surface, or outer side of the wall. The spraying worker holds the nozzle and moves along the surface of the reinforcing mesh, spraying concrete onto the reinforcing mesh and the construction surface behind it.

[0003] The nozzles of existing concrete spraying machines are mostly ordinary straight or curved nozzles. The nozzle front end lacks a distance-limiting guide structure to cooperate with the steel mesh or construction surface. When operated manually, the distance and angle between the nozzle and the construction surface mainly depend on the experience of the construction personnel. When the nozzle is too close, the concrete is prone to splashing, accumulating and clogging the nozzle opening. When the nozzle is too far away, the spray flow diffuses and the amount of rebound material increases. When the nozzle is tilted, it is easy to cause the spray layer to be thick on one side and thin on the other side, which affects the spraying quality and material utilization rate. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art where manually operated spray nozzles are prone to issues such as inconsistent nozzle distance, tilted spray angle, and direct impact of the spray stream on the intersection of the reinforcing mesh. These problems lead to increased concrete rebound, uneven spray layer thickness, insufficient filling behind the reinforcing mesh, and rebound material easily impacting the spray outlet in the opposite direction, affecting the stability of continuous spraying.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a concrete spraying machine for civil engineering: comprising a concrete spraying machine body, the concrete spraying machine for civil engineering further comprising:

[0006] A delivery pipe is installed on one side of the concrete spraying machine body, and the delivery pipe is connected to the interior of the concrete spraying machine body;

[0007] A spraying head is installed at the end of the delivery pipe away from the concrete spraying machine body. The spraying head is connected to the delivery pipe. The interior of the spraying head forms a spraying channel for concrete to pass through, and the front end of the spraying head forms a spraying outlet.

[0008] A distance-limiting guide assembly is sleeved and fixedly installed on the outer periphery of the spray head to limit the distance between the spray head and the construction surface or steel mesh, and to guide the movement of the spray head.

[0009] An adjustable distance limiting component is disposed on the distance limiting guide component and cooperates with the distance limiting guide component to adjust the forward extension distance of the distance limiting guide component relative to the spray outlet of the spray head;

[0010] An anti-rebound cover is fitted around the outer periphery of the nozzle and forms an annular rebound buffer cavity between it and the outer wall of the nozzle.

[0011] In a preferred embodiment, the distance-limiting guide assembly includes:

[0012] Two fixing rings are respectively fitted onto the outer circumferential surface of the spray head. The two fixing rings are spaced apart along the axial direction of the spray head, and the two fixing rings are fixed to the outer circumference of the spray head by clamps.

[0013] Three support arms are arranged at circumferential intervals along the two fixed rings. The three support arms are distributed in a triangle. Each support arm extends along the spray direction of the spray head, with its rear part cooperating with the two fixed rings and its front part extending towards the spray outlet of the spray head.

[0014] Three support frames are respectively fixedly installed at the front ends of the three support arms;

[0015] Three hinge shafts are rotatably mounted on the three support frames, respectively;

[0016] Three limiting rollers are respectively mounted on the three hinge shafts and can rotate relative to the support frame with the hinge shafts.

[0017] The technical effects of adopting the above-mentioned further solution are as follows: the axial spacing support of the support arm by the two fixed rings can improve the connection stability between the distance limiting guide component and the spray head; the three support arms and three distance limiting rollers are distributed in a triangle, which can form multi-point rolling support on the steel mesh or construction surface, so that the spray outlet is kept in a retracted state relative to the distance limiting contact surface, thereby stabilizing the spray distance and reducing the spray head deviation and uneven spray layer.

[0018] In a preferred embodiment, the distance-limiting guide assembly further includes:

[0019] Three scales are fixedly installed on the top of the three support arms, and the scales are set along the length of the support arms.

[0020] The technical effect of adopting the above-mentioned further solution is that by setting a scale on the top of the three support arms, the extension length of each support arm relative to the adjusting sleeve can be displayed intuitively, which makes it convenient for construction personnel to adjust the position of the three limiting rollers simultaneously, so that the front ends of the three limiting rollers are kept on the same limiting contact surface, avoiding the spray head tilting due to the different extension of a single roller, and improving the accuracy of spray distance control.

[0021] In a preferred embodiment, the adjustable distance limiting component further includes:

[0022] Three adjusting sleeves are spaced apart along the circumference of the spray head and correspond one-to-one with the three support arms. The three adjusting sleeves are connected between the two fixed rings or fixed to the outside of the fixed rings. The three support arms pass through the corresponding adjusting sleeves and slide with the corresponding adjusting sleeves.

[0023] The end face of the adjusting sleeve forms a reading reference, and the scale lines of the ruler protrude from the outside of the adjusting sleeve to display the extension length of the support arm.

[0024] A screw is provided along the sliding direction of the support arm. One end of the screw is rotatably connected to the support arm, and the other end passes through the adjusting sleeve and is threadedly connected to the adjusting sleeve.

[0025] A knob is fixedly installed at one end of the screw.

[0026] The technical effect of adopting the above-mentioned further solution is that by adjusting the sleeve and the support arm slidingly, and by using the screw and the adjusting sleeve threadedly connected, rotating the knob can drive the support arm to move back and forth, thereby adjusting the forward extension distance of the distance limiting roller relative to the spray outlet, so that the spray head can adapt to different spray thicknesses and construction surface conditions. The adjustment process is intuitive and stable, and there is no need to completely disassemble the distance limiting guide component.

[0027] In a preferred embodiment, the adjustable distance limiting component further includes:

[0028] Each of the adjusting sleeve inner cavities has a limiting groove on both sides, and the limiting groove extends along the sliding direction of the support arm;

[0029] Each of the support arms is provided with a limit block on both sides, and the limit block is slidably installed in the corresponding limit groove.

[0030] The technical effect of adopting the above-mentioned further solution is that by setting a limiting groove in the adjusting sleeve and allowing the limiting block on the support arm to slide along the limiting groove, the circumferential rotation or lateral sway of the support arm in the adjusting sleeve can be restricted, so that the support arm can only move back and forth in a predetermined direction, thereby ensuring the stability of the posture of the limiting roller after adjustment and avoiding the roller from being skewed and affecting its rolling along the steel mesh or construction surface.

[0031] As a preferred embodiment, the civil engineering concrete spraying machine further includes:

[0032] The rear end of the anti-rebound shield is connected to the fixing ring located on the rear side, and the front end of the anti-rebound shield opens in the direction of spray, so that the anti-rebound shield as a whole forms a trumpet-shaped shield structure that is larger in the front and smaller in the back. The front edge of the anti-rebound shield is located behind the distance limiting roller and does not exceed the front end of the distance limiting roller.

[0033] The lower side of the anti-rebound cover forms a downward-opening lower discharge guide gap between the lower side and the outer wall of the spray head.

[0034] The technical effect of adopting the above-mentioned further solution is that by setting a front-large and rear-small anti-rebound cover around the outer periphery of the spray head, and making it form an annular rebound buffer cavity with the outer wall of the spray head, the rebounding mortar and stones can be blocked, buffered and deflected; since the front edge of the anti-rebound cover is located behind the distance limiting roller, it will not affect the distance limiting contact of the roller, and at the same time, it can guide some of the rebounded material to the outside and down, reducing its direct impact on the spray outlet.

[0035] As a preferred embodiment, the civil engineering concrete spraying machine further includes:

[0036] The removable wear-resistant liner is fixed to the inner wall of the anti-rebound cover by screws.

[0037] The technical advantages of adopting the above-mentioned further solution are as follows: by setting a removable wear-resistant liner on the inner wall of the anti-rebound cover, the wear-resistant liner can directly bear the scouring and wear of the rebound mortar and stones, reducing the wear of the anti-rebound cover body; when the wear-resistant liner is worn, it can be replaced separately by removing the screws, without having to replace the entire anti-rebound cover, thereby reducing maintenance costs and increasing the service life of the device in high-wear spraying environments.

[0038] As a preferred embodiment, the civil engineering concrete spraying machine further includes:

[0039] A wear-resistant rubber layer is disposed on the outer periphery of the three limiting rollers.

[0040] The technical effects of adopting the above-mentioned further solution are as follows: by setting a wear-resistant rubber layer on the outer periphery of the three distance rollers, the adhesion stability between the distance rollers and the steel mesh or construction surface can be improved, and the slippage, vibration and impact noise caused by direct contact between the metal rollers can be reduced; at the same time, the wear-resistant rubber layer can buffer the rolling contact force, reduce the scratching of the steel mesh or the sprayed base layer, and make the movement of the spray head more stable.

[0041] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0042] 1. This invention enables stable concrete delivery to the spraying end by setting a conveying pipe between the concrete spraying machine body and the spraying head; by setting a distance-limiting guide component on the outer periphery of the spraying head, the distance-limiting rollers can make contact with and roll the spraying head when it approaches the steel mesh or construction surface, thereby maintaining a relatively stable predetermined distance between the spraying outlet and the construction surface, reducing the problems of uneven spraying layer and increased rebound caused by inconsistent spraying distance and spraying angle deviation when manually spraying; the adjustable distance-limiting guide component can adjust the forward extension distance to adapt to different spraying thicknesses and construction surface conditions, improving applicability; at the same time, the anti-rebound cover and the outer wall of the spraying head form an annular rebound buffer cavity, which can guide some of the rebound material to the outside and downward, avoiding its direct impact on the spraying outlet, thereby reducing the risk of spraying head blockage, wear and unstable spraying. Attached Figure Description

[0043] Figure 1 This is a perspective view of an embodiment of the present invention;

[0044] Figure 2 This is a perspective view of another embodiment of the present invention;

[0045] Figure 3 This is a perspective cross-sectional view of the adjustable distance limiting component according to an embodiment of the present invention;

[0046] Figure 4 This is a perspective cross-sectional view of the distance-limiting guide assembly according to an embodiment of the present invention;

[0047] Figure 5 This is an embodiment of the present invention. Figure 4 Enlarged view of point A.

[0048] Legend:

[0049] 1. Concrete spraying machine body; 2. Conveying pipe; 3. Adjustable distance limiting component; 301. Adjusting sleeve; 302. Screw; 303. Knob; 304. Limiting block; 305. Limiting groove; 4. Anti-rebound cover; 5. Distance limiting guide component; 501. Distance limiting roller; 502. Support frame; 503. Support arm; 504. Fixing ring; 505. Hinge shaft; 506. Scale; 6. Spraying head. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] Example:

[0052] Please see Figures 1-5 This embodiment provides a concrete spraying machine for civil engineering, suitable for applications such as tunnel support, foundation pit slope support, and wall repair that require spraying concrete onto steel mesh or construction surfaces. This concrete spraying machine, by setting a distance-limiting guide component and an anti-rebound cover around the spraying head, ensures that the spraying head maintains a relatively stable spraying distance from the steel mesh or construction surface during the spraying process, and reduces the direct impact of rebound material on the spraying outlet. The specific approach is as follows:

[0053] A concrete spraying machine for civil engineering includes a concrete spraying machine body 1. The concrete spraying machine body 1 serves as the main structure for concrete mixing, conveying, or pressurized spraying. Its interior is connected to a conveying pipe 2. The concrete spraying machine body 1 continuously pushes concrete into the conveying pipe 2, enabling the concrete to stably enter the spraying end from the main machine side, thereby providing a basis for the directional spraying of the subsequent spraying head 6.

[0054] The delivery pipe 2 is installed on one side of the concrete spraying machine body 1. One end of the delivery pipe 2 is connected to the interior of the concrete spraying machine body 1, and the other end is connected to the spraying head 6. The delivery pipe 2 is used to form a concrete delivery channel between the concrete spraying machine body 1 and the spraying head 6.

[0055] Concrete flows along the delivery pipe 2 to the spray head 6, allowing the spray head 6 to complete the spraying operation at a position away from the concrete spraying machine body 1, making it easier for construction personnel to move the spray head 6 to the vicinity of the steel mesh or the construction surface.

[0056] The spraying head 6 is installed at the end of the delivery pipe 2 away from the concrete spraying machine body 1. The spraying outlet 601 is located at the front end of the spraying head 6 and communicates with the spraying channel inside the spraying head 6. The spraying outlet 601 is recessed rearward relative to the distance contact surface formed by the three distance rollers 501, so that the distance rollers 501 contact the reinforcing mesh or construction surface before the spraying outlet 601. Therefore, the spraying outlet 601 does not directly contact the reinforcing mesh or construction surface, which reduces the risk of the spraying outlet 601 being blocked or worn by rebound material.

[0057] After the concrete enters the spray head 6 through the delivery pipe 2, it is sprayed out from the spray outlet of the spray head 6 towards the steel mesh or the construction surface. Since the spray head 6 is equipped with a distance-limiting guide component 5 on its outer periphery, the spray head 6 will not directly contact the steel mesh or the construction surface when it is close to the construction surface, thereby reducing the risk of the spray outlet being blocked or worn by splashed material due to close contact.

[0058] The distance limiting guide component 5 is sleeved and fixedly installed on the outer periphery of the spray head 6. The distance limiting guide component 5 is used to limit the distance between the spray head 6 and the steel mesh or construction surface.

[0059] Specifically, the distance limiting guide assembly 5 includes two fixing rings 504. The two fixing rings 504 are respectively sleeved on the outer peripheral surface of the spray head 6 and are distributed at intervals along the axial direction of the spray head 6. The two fixing rings 504 can be fixed to the outer periphery of the spray head 6 by clamps. The two fixing rings 504 jointly bear the reaction force transmitted by the support arm 503, so that the distance limiting guide assembly 5 will not shake relative to the spray head 6 due to single-point force, thereby improving the connection stability between the distance limiting guide assembly 5 and the spray head 6.

[0060] Three support arms 503 are arranged circumferentially around the two fixing rings 504 and are distributed in a triangular pattern. Each support arm 503 extends along the spray direction of the spray head 6, with its rear part cooperating with the two fixing rings 504 and its front part extending toward the spray outlet direction of the spray head 6.

[0061] Three support arms 503 support the distance limiting rollers 501 from three directions around the outer periphery of the spray head 6, forming a three-point support structure in front of the spray head 6. When the spray head 6 approaches the steel mesh or construction surface, the three support arms 503 can share the reaction force from the steel mesh or construction surface, preventing the spray head 6 from being significantly tilted due to unilateral force.

[0062] Three support frames 502 are fixedly installed at the front end of three support arms 503 respectively, and each support frame 502 is used to install the corresponding hinge shaft 505.

[0063] The support frame 502 transmits the contact force on the distance roller 501 to the support arm 503, and at the same time provides a stable rotation installation position for the distance roller 501, so that the distance roller 501 can rotate smoothly during the movement of the spray head 6, instead of sliding and rubbing directly with the steel mesh or construction surface.

[0064] Three hinge shafts 505 are respectively hinged to one side of three support frames 502, and three distance-limiting rollers 501 are respectively fixedly installed in the middle of the three hinge shafts 505.

[0065] The distance limiting roller 501 can rotate around the corresponding hinge shaft 505. When the spray head 6 moves along the steel mesh or construction surface, the distance limiting roller 501 rolls forward in the direction of movement, reducing the jamming and resistance when the spray head 6 moves. At the same time, the front ends of the three distance limiting rollers 501 together form a distance limiting contact surface. The spray outlet of the spray head 6 is set backward relative to the distance limiting contact surface, thereby forming a predetermined distance between the spray outlet and the steel mesh or construction surface.

[0066] The process of the three limiting rollers 501 rolling stably along the surface of the reinforcing mesh is as follows: When the spray head 6 approaches the reinforcing mesh, the three limiting rollers 501 contact the reinforcing mesh before the spray outlet, and the three limiting rollers 501 are triangularly distributed around the spray head 6. Therefore, they can form three-point contact support on the surface of the reinforcing mesh, such as upper, lower left, lower right, or similar points. When the construction personnel push the spray head 6 to move along the reinforcing mesh, the three limiting rollers 501 roll around their respective hinge axes 505, and together with the three support frames 502, three support arms 503, and two fixing rings 504, they maintain the posture of the spray head 6. Even if there are slight undulations in the local area of ​​the reinforcing mesh, the three limiting rollers 501 can reduce the shaking of the spray head 6 through multi-point contact, so that the spray outlet is always located behind the limiting contact surface, thereby maintaining a predetermined distance between the spray outlet and the reinforcing mesh or construction surface, reducing the problem of uneven spraying layer and increased rebound caused by inconsistent spraying distance.

[0067] Three scales 506 are fixedly installed on the top of the three support arms 503 respectively, and the scales 506 are set along the length of the support arms 503.

[0068] The scale 506 can be used to observe the extension length of the support arm 503 relative to the adjusting sleeve 301, ensuring that the construction personnel maintain a consistent forward extension distance of the three limiting rollers 501 when adjusting the three support arms 503. This prevents one limiting roller 501 from overextending or retracting, causing the spray head 6 to tilt, thus ensuring that the limiting contact surface formed by the three limiting rollers 501 is relatively stable. After adjustment, the extension length of the three support arms 503 is consistent, so that the foremost ends of the three limiting rollers 501 are located within the same limiting contact surface, which is located in front of the spray outlet of the spray head 6, with the spray outlet retracted backward relative to the limiting contact surface. During spraying, the three limiting rollers 501 together abut against the reinforcing mesh or construction surface, limiting the spray head 6 from further approaching the construction surface and maintaining a predetermined distance between the spray outlet and the construction surface.

[0069] The adjustable distance limiting component 3 is located inside and on one side of the distance limiting guide component 5. The adjustable distance limiting component 3 is used to adjust the forward extension distance of the distance limiting roller 501 relative to the spray outlet of the spray head 6.

[0070] Specifically, the adjustable distance limiting component 3 includes three adjusting sleeves 301, each of which corresponds to one of the three support arms 503. The support arms 503 pass through the corresponding adjusting sleeves 301 and slide with them.

[0071] The support arm 503 can move back and forth along the adjusting sleeve 301, so that the distance limiting roller 501 extends or retracts relative to the spray outlet of the spray head 6, thereby changing the predetermined distance between the spray outlet and the steel mesh or construction surface.

[0072] The screw 302 is rotatably mounted on the side of the support arm 503 near the adjusting sleeve 301. The screw 302 passes through the middle of one side of the adjusting sleeve 301 and is threadedly connected to the adjusting sleeve 301. The knob 303 is fixedly mounted on one end of the screw 302.

[0073] Furthermore, a rotating connecting seat is provided at one end of the support arm 503 near the adjusting sleeve 301. One end of the screw 302 is rotatably connected to the rotating connecting seat through a limiting ring or a snap ring, so that the screw 302 can rotate relative to the support arm 503, but cannot disengage from the support arm 503 along the axial direction of the support arm 503. Thus, when the knob 303 drives the screw 302 to rotate relative to the adjusting sleeve 301, the screw 302 generates axial displacement under the action of the threaded engagement, and drives the support arm 503 to slide back and forth along the adjusting sleeve 301 through the rotating connecting seat, thereby adjusting the forward extension distance of the limiting roller 501.

[0074] The construction worker rotates the knob 303, which drives the screw 302 to rotate. Since the screw 302 is threadedly engaged with the adjusting sleeve 301, the screw 302 drives the support arm 503 to move back and forth along the adjusting sleeve 301 during rotation. Through this structure, the forward extension distance of the limiting roller 501 can be adjusted more precisely, so that the spray head 6 can adapt to different spray thicknesses or different exposed heights of steel mesh.

[0075] Each adjusting sleeve 301 has a limiting groove 305 on both sides of its inner cavity, which extends along the sliding direction of the support arm 503. Each support arm 503 has a limiting block 304 on both sides, which slides in the corresponding limiting groove 305. When the support arm 503 slides back and forth in the adjusting sleeve 301, the limiting block 304 moves synchronously along the limiting groove 305. The limiting groove 305 can restrict the support arm 503 from circumferential rotation or lateral sway, so that the support arm 503 can only move in a predetermined direction. This ensures that the rolling direction of the limiting roller 501 is stable after adjustment, and thus ensures that the limiting roller 501 maintains the correct orientation after adjusting the forward extension distance, so that the limiting roller 501 can stably adhere to and roll on the steel mesh or construction surface.

[0076] The anti-rebound cover 4 is fitted around the outer periphery of the spray head 6 and is located behind the outlet of the distance guide assembly 5. The rear end of the anti-rebound cover 4 is connected to the fixing ring 504 located on the rear side. The front end of the anti-rebound cover 4 opens in the spray direction, so that the anti-rebound cover 4 as a whole forms a trumpet-shaped cover structure that is larger in the front and smaller in the back.

[0077] Concrete is sprayed forward from the nozzle of the spray head 6. Some of the concrete material that bounces back from the steel mesh or the construction surface will first contact the inner wall of the anti-rebound cover 4 instead of directly impacting the spray nozzle in the opposite direction, thereby reducing the possibility of splash accumulation, blockage and wear at the spray nozzle.

[0078] The front edge of the anti-rebound cover 4 is located behind the distance limiting roller 501 and does not extend beyond the front end of the distance limiting roller 501.

[0079] The distance limiting roller 501 first contacts the steel mesh or construction surface. The anti-rebound cover 4 will not directly press against the steel mesh or scrape the newly sprayed concrete layer. Therefore, it can ensure that the distance limiting roller 501 forms a distance limiting contact surface normally, and also prevent the anti-rebound cover 4 from damaging the surface of the sprayed layer. Since the front end of the anti-rebound cover 4 is open in the spraying direction, after the rebound material contacts the inner wall of the anti-rebound cover 4, it will deflect outward along the horn-shaped inner wall and be discharged downward along the lower area of ​​the anti-rebound cover 4 under the action of gravity. This guides some of the rebound material to the outside and downward, preventing the rebound material from rushing back to the spray outlet in the spraying direction.

[0080] The anti-rebound cover 4 is fitted around the outer periphery of the spray head 6 and is located behind the spray outlet 601 of the spray head 6. The rear end of the anti-rebound cover 4 is connected to the fixing ring 504 located on the rear side. The front end of the anti-rebound cover 4 opens in the spray direction, so that the anti-rebound cover 4 as a whole forms a trumpet-shaped cover structure that is larger in the front and smaller in the back.

[0081] The front edge of the anti-rebound cover 4 is located behind the distance limiting roller 501 and does not exceed the front end of the distance limiting roller 501, so that the distance limiting roller 501 contacts the steel mesh or construction surface first, and the anti-rebound cover 4 will not directly press against the steel mesh or scrape the newly sprayed concrete layer.

[0082] An annular rebound buffer cavity 401 is formed between the anti-rebound cover 4 and the outer wall of the injection head 6. The lower part of the anti-rebound cover 4 is provided with a lower discharge guide gap 403 that communicates with the annular rebound buffer cavity 401.

[0083] During the spraying process, some of the rebound material first enters the annular rebound buffer chamber 401 and is blocked and buffered by the inner wall of the anti-rebound cover 4 and the detachable wear-resistant liner 402. Then, it deflects outward along the inner wall of the anti-rebound cover 4 and is discharged downward through the lower discharge guide gap 403 under the action of gravity, thereby reducing the direct impact of the rebound material on the spray outlet 601 and avoiding the long-term accumulation of the rebound material in the anti-rebound cover 4.

[0084] The rebound mortar, gravel, and cement slurry entering the anti-rebound cover 4 can temporarily enter the annular rebound buffer chamber. The annular rebound buffer chamber provides buffering and deflection space for the rebound material, changing the direction of movement of the rebound material from a reverse impact towards the injection outlet to diffusion outward and downward along the inner wall of the anti-rebound cover 4. This reduces the concentrated impact of the rebound material on the injection outlet and improves the stability of the injection head 6 during continuous injection.

[0085] The detachable wear-resistant liner is fixedly installed on the inner wall of the anti-rebound cover 4 with screws. The detachable wear-resistant liner is located in a position that is easily eroded by the rebounding material. The detachable wear-resistant liner directly bears the friction and impact of the rebounding mortar and stones, reducing the wear of the anti-rebound cover 4 body. When the detachable wear-resistant liner is worn, it can be replaced separately by removing the screws, without having to replace the entire anti-rebound cover 4, thereby improving the maintenance convenience of the anti-rebound cover 4.

[0086] The wear-resistant rubber layer is set on the outer periphery of the three spacer rollers 501. The wear-resistant rubber layer is in direct contact with the steel mesh or construction surface, which can increase the adhesion stability between the spacer rollers 501 and the steel mesh, reduce the vibration and slippage caused by the direct collision of the metal rollers with the steel mesh. At the same time, the wear-resistant rubber layer can buffer the impact when the spacer rollers 501 roll, so that the three spacer rollers 501 roll more smoothly along the surface of the steel mesh, further maintaining the predetermined distance between the spray outlet and the steel mesh or construction surface.

[0087] Working principle:

[0088] First, adjust the adjustable distance limiting component 3 according to the designed spraying thickness or the construction surface conditions. The construction personnel rotate the three knobs 303 respectively, so that the three screws 302 drive the corresponding support arms 503 to move along the adjusting sleeve 301. The scale 506 is used to confirm that the extension length of the three support arms 503 is consistent, so that the front ends of the three distance limiting rollers 501 are on the same distance limiting contact surface. Then, start the concrete spraying machine body 1. The concrete enters the spraying head 6 through the delivery pipe 2 and is sprayed from the spraying outlet of the spraying head 6 onto the steel mesh or construction surface.

[0089] During the spraying process, the three distance-limiting rollers 501 first contact the steel mesh or construction surface and roll along its surface. The three distance-limiting rollers 501 maintain the stability of the spray head 6 through triangular multi-point support, so that the spray outlet is always located behind the distance-limiting contact surface, thereby maintaining the predetermined distance between the spray outlet and the steel mesh or construction surface.

[0090] Meanwhile, some of the rebounding concrete enters the annular rebound buffer chamber between the anti-rebound cover 4 and the outer wall of the spray head 6. It is blocked, buffered, and deflected by the flared inner wall and removable wear-resistant lining of the anti-rebound cover 4, and then guided outwards and downwards along the inner wall of the anti-rebound cover 4, preventing the rebounding material from directly impacting the spray outlet. Through this combination, the device can improve the spray distance stability when the spray head 6 is manually moved, reducing the impact of spray head 6 swaying, spray distance changes, and rebounding material backlash on the continuity of spraying.

[0091] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0092] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. 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 scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A civil engineering concrete sprayer comprising a concrete sprayer body (1), characterized in that, The concrete spraying machine for this civil engineering project also includes: A delivery pipe (2) is installed on one side of the concrete spraying machine body (1), and the delivery pipe (2) is connected to the interior of the concrete spraying machine body (1). The spray head (6) is installed at one end of the conveying pipe (2) away from the concrete spraying machine body (1). The spray head (6) is connected to the conveying pipe (2). The inside of the spray head (6) forms a spraying channel for concrete to pass through. The front end of the spray head (6) forms a spraying outlet. The distance-limiting guide component (5) is sleeved and fixedly installed on the outer periphery of the spray head (6) to limit the distance between the spray head (6) and the construction surface or steel mesh, and to guide the movement posture of the spray head (6). An adjustable distance limiting component (3) is disposed on the distance limiting guide component (5) and cooperates with the distance limiting guide component (5) to adjust the forward extension distance of the distance limiting guide component (5) relative to the spray outlet of the spray head (6); The anti-rebound cover (4) is fitted around the outer periphery of the spray head (6) and forms an annular rebound buffer cavity (401) between it and the outer wall of the spray head (6).

2. The concrete spraying machine for civil engineering according to claim 1, characterized in that, The distance-limiting guide assembly (5) includes: Two fixing rings (504) are respectively sleeved on the outer circumferential surface of the spray head (6). The two fixing rings (504) are distributed at intervals along the axial direction of the spray head (6), and the two fixing rings (504) are fixed to the outer circumference of the spray head (6) by clamps. Three support arms (503) are arranged at circumferential intervals along the two fixed rings (504). The three support arms (503) are arranged in a triangular distribution. Each support arm (503) extends along the spray direction of the spray head (6), and its rear part cooperates with the two fixed rings (504). Its front part extends toward the spray outlet direction of the spray head (6). Three support frames (502) are respectively fixedly installed at the front end of the three support arms (503); Three hinge shafts (505) are rotatably mounted on three of the aforementioned support frames (502); Three limiting rollers (501) are respectively mounted on the three hinge shafts (505) and can rotate with the hinge shafts (505) relative to the support frame (502).

3. A concrete spraying machine for civil engineering projects according to claim 2, characterized in that, The distance-limiting guide assembly (5) also includes: Three scales (506) are fixedly installed on the top of the three support arms (503), and the scales (506) are set along the length of the support arms (503).

4. A concrete spraying machine for civil engineering projects according to claim 3, characterized in that, The adjustable distance limiting component (3) further includes: Three adjusting sleeves (301) are arranged at intervals along the circumference of the spray head (6) and correspond one-to-one with three support arms (503). The three adjusting sleeves (301) are connected between two fixed rings (504) or fixed to the outside of the fixed rings (504). The three support arms (503) pass through the corresponding adjusting sleeves (301) and slide with the corresponding adjusting sleeves (301). The end face of the adjusting sleeve (301) forms a reading reference, and the scale line of the scale (506) is exposed outside the adjusting sleeve (301) to display the extension length of the support arm (503). The screw (302) is rotatably mounted on the side of the support arm (503) near the adjusting sleeve (301). The screw (302) passes through the middle of one side of the adjusting sleeve (301), and the screw (302) is threadedly connected to the middle of one side of the adjusting sleeve (301). A knob (303) is fixedly installed at one end of the screw (302).

5. A concrete spraying machine for civil engineering projects according to claim 4, characterized in that, The adjustable distance limiting component (3) further includes: Each of the adjusting sleeves (301) has a limiting groove (305) on both sides of its inner cavity, and the limiting groove (305) extends along the sliding direction of the support arm (503). Each of the support arms (503) is provided with a limit block (304) on both sides, and the limit block (304) is slidably installed in the corresponding limit groove (305).

6. A concrete spraying machine for civil engineering projects according to claim 2, characterized in that, The concrete spraying machine for this civil engineering project also includes: The rear end of the anti-rebound shield (4) is connected to the fixing ring (504) located on the rear side. The front end of the anti-rebound shield (4) opens in the direction of spraying, so that the anti-rebound shield (4) as a whole forms a trumpet-shaped shield structure that is larger in the front and smaller in the back. The front edge of the anti-rebound shield (4) is located behind the distance limiting roller (501) and does not exceed the front end of the distance limiting roller (501). The lower part of the anti-rebound cover (4) is provided with a lower guide gap (403) that communicates with the annular rebound buffer cavity (401).

7. A concrete spraying machine for civil engineering projects according to claim 6, characterized in that, The concrete spraying machine for this civil engineering project also includes: The removable wear-resistant liner is fixed to the inner wall of the anti-rebound cover (4) by screws.

8. A concrete spraying machine for civil engineering projects according to claim 2, characterized in that, The concrete spraying machine for this civil engineering project also includes: A wear-resistant rubber layer is disposed on the outer periphery of the three distance-limiting rollers (501).

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