Concrete retaining wall spraying machine for foundation pit construction

Abstract

The invention relates to the field of foundation pit construction, in particular to a concrete retaining wall spraying machine for foundation pit construction. A monitoring unit used for monitoring the concrete springback amount is arranged below the spray head and arranged on the support, the monitoring unit comprises four conveying wheels arranged in a trapezoidal structure, the four conveying wheels are sleeved with a conveying belt, the conveying belt is in transmission fit with the conveying wheels, the upper portion of the conveying belt is used for bearing and conveying concrete springback materials, and the lower portion of the conveying belt is used for bearing and conveying the concrete springback materials. Among the four conveying wheels arranged in a trapezoidal structure, two conveying wheels at higher positions are arranged in the horizontal direction, one section of the conveying belt in lap joint with the two conveying wheels at higher positions is in a concave bent shape, and a bearing wheel for bearing the conveying belt is arranged on the lower portion of the concave bent section of the conveying belt. And a pressure sensor is fixedly arranged on the peripheral wall of the bearing wheel. According to the invention, the accuracy of the monitored springback value is ensured, and the service life of the pressure sensor can be prolonged.

Description

Technical Field

[0001] The invention relates to the field of foundation pit construction, and in particular to a concrete wall protection spraying machine used for foundation pit construction. Background Art

[0002] When existing construction equipment for building foundation pits supports a designated slope with shotcrete, the consistency of the concrete may change. During the shotcrete spraying process, the size of the nozzle and the injection pressure need to be adjusted accordingly, otherwise blockage and other problems may occur. The adjustment of the nozzle size and injection pressure will also cause changes in the injection point and rebound amount, which is inconvenient to control. In addition, during the working process, the structure of the nozzle is usually fixed, and the adjustment is not flexible enough to meet complex construction needs.

[0003] Chinese patent CN118531799B discloses a construction equipment for a foundation pit, including a mobile jetting support, and also including: a mounting base, the mounting base is fixedly mounted on the mobile jetting support, and a conveying detection tube is detachably mounted on the mounting base, and a square support is arranged on the conveying detection tube, and the square support is communicated with the conveying detection tube; an adjustable nozzle enclosure plate 2, the adjustable nozzle enclosure plate 2 is slidably mounted on the square support, and an adjustable nozzle enclosure plate 1 is inserted on the adjustable nozzle enclosure plate 2, and the adjustable nozzle enclosure plate 1 is slidably connected with the adjustable nozzle enclosure plate 2 and the square support respectively; and a jet control mechanism, the The injection control mechanism is respectively connected to the mobile injection support, the conveying detection tube, the adjustable nozzle enclosure plate one and the adjustable nozzle enclosure plate two, wherein the injection control mechanism includes an injection monitoring system, a nozzle size adjustment component and a monitoring state adjustment component; the nozzle size adjustment component is respectively connected to the mobile injection support, the adjustable nozzle enclosure plate one and the adjustable nozzle enclosure plate two, the injection monitoring system is respectively connected to the mobile injection support, the conveying detection tube, the adjustable nozzle enclosure plate one and the adjustable nozzle enclosure plate two, and is electrically connected to the nozzle size adjustment component, and the monitoring state adjustment component is respectively connected to the mobile injection support and the injection monitoring system.

[0004] The above scheme improves the rebound amount of concrete by controlling the size of the injection nozzle through an adjustable nozzle enclosure. However, the factors affecting the rebound amount of concrete are not only the initial velocity of the nozzle, but also the injection angle, which is related to the consistency of the concrete. The nozzle angle used for injection in the above scheme is fixed, and the consistency of the sprayed concrete cannot be accurately judged. The rebound amount of concrete can only be changed by changing the size of the nozzle, which has great limitations. In addition, the above scheme has disadvantages when monitoring the rebound amount through a weight detector, that is, the concrete cannot be cleaned after falling on the weight detector. After a period of use, the weight detector can no longer monitor the rebound amount of the concrete, resulting in the size of the nozzle being unable to adjust itself according to the feedback of the rebound amount. At the same time, there are aggregates in the concrete, and the aggregates directly hit the weight detector, which will cause the weight detector to be damaged, increase the maintenance frequency, and cause the value detected by the weight detector to have a large deviation, resulting in unnecessary concrete loss. In addition, when the existing concrete spraying equipment absorbs concrete, the concrete is pre-mixed. When it is left to stand, the upper and lower layers of the concrete will have different consistencies, which will also affect the adsorption effect of the sprayed concrete. Summary of the invention

[0005] In view of the above problems, a concrete wall spraying machine for foundation pit construction is provided. A rotating conveyor belt is arranged, and a concave curved section is formed on the upper part of the conveyor belt. A receiving wheel is arranged on the lower part of the conveyor belt at the concave curved section. A pressure sensor is arranged on the receiving wheel. This not only ensures the accuracy of the monitored rebound value, but also extends the service life of the pressure sensor, thereby ensuring the stability of the monitoring unit when monitoring the rebound amount, and reducing the material loss caused by monitoring deviation during concrete spraying.

[0006] To solve the problems of the prior art, the present invention provides a concrete wall spraying machine for foundation pit construction, comprising a nozzle and a bracket; a monitoring unit for monitoring the rebound amount of concrete is arranged below the nozzle, the monitoring unit is arranged on the bracket, the monitoring unit comprises four conveying wheels arranged in a trapezoidal structure, a conveying belt is sleeved on the outer side of the four conveying wheels, the conveying belt is matched with the conveying wheels in transmission, the upper part of the conveying belt is used for receiving and conveying concrete rebound material, among the four conveying wheels arranged in a trapezoidal structure, two conveying wheels at higher positions are arranged in a horizontal direction, a section of the conveying belt overlapped on the two conveying wheels at higher positions is in a concave curved shape, the length of the conveying belt between the two conveying wheels at higher positions is greater than the straight-line distance between the two conveying wheels, and the length of the conveying belt between the two conveying wheels at higher positions remains unchanged, a receiving wheel for receiving the conveying belt is arranged at the lower part of the concave curved section of the conveying belt, a pressure sensor is fixedly arranged on the peripheral wall of the receiving wheel, and the pressure sensor monitors the weight of the concrete rebound material received on the conveying belt.

[0007] Preferably, a plurality of protruding blocks are evenly and fixedly arranged around the annular structure of the conveyor belt on the outer circumference of the conveyor belt, and gaps for placing the rebound material are provided between the protruding blocks.

[0008] Preferably, meshing grooves are evenly provided on the inner ring side of the conveyor belt, a meshing wheel is fixedly provided at the end of the conveying wheel, and meshing blocks are evenly fixedly provided on the peripheral wall of the meshing wheel around the axis of the meshing wheel, and the meshing blocks mesh with the meshing grooves.

[0009] Preferably, a lifting frame is provided at the end of the receiving wheel, the lifting frame passes through the side of the bracket in the horizontal direction and moves on the bracket in the vertical direction, an extension rod is fixedly provided in the vertical direction on the upper part of the lifting frame, a fixing plate is provided on the upper part of the lifting frame, the fixing plate is fixedly provided horizontally on the side wall of the bracket, the extension rod passes through the fixing plate and slides with the fixing plate, there is a gap between the upper part of the extension rod and the upper part of the fixing plate, a spring is provided in the gap along the extension direction of the extension rod, and both ends of the spring are fixedly connected to the upper end part of the extension rod and the upper part of the fixing plate, respectively.

[0010] Preferably, the trapezoidal structure formed by the four conveying wheels has an angle, the sharp corner faces the foundation pit retaining wall, and a guide plate is inclined at the front end of the sharp corner, the guide plate is inclined toward the conveyor belt, and the falling rebound material first falls on the guide plate and then falls on the conveyor belt.

[0011] Preferably, a cleaning unit is provided below the conveyor belt, and the cleaning unit includes a cleaning roller rotatably provided below the conveyor belt, and the axial direction of the cleaning roller is parallel to the axial direction of the conveying wheel. A water sprayer is provided on one side of the cleaning roller, and the water sprayer sprays clean water on the outer ring side of the conveyor belt. The cleaning roller is always in contact with the outer ring side of the conveyor belt.

[0012] Preferably, a third rotary drive is provided on one side of the nozzle, and the third rotary drive is used to drive the nozzle to rotate. The rotation angle of the nozzle is preset with a rated working angle range. When the third rotary drive drives the nozzle to rotate, the angle of the nozzle is always within the rated working angle range.

[0013] Preferably, a stirring unit connected to the nozzle is provided on one side of the nozzle, and the stirring unit includes a horizontally arranged stirring barrel, and a stirring frame is rotatably arranged in the stirring barrel, and the stirring frame is a cylindrical frame structure, and a plurality of stirring plates are evenly fixedly arranged on the stirring frame around the axis of the stirring frame.

[0014] Preferably, a detection unit is provided at the bottom of the mixing barrel, and the detection unit is used to detect the consistency of the concrete in the mixing barrel. The detection unit is preset with a rated consistency. When the concrete consistency detected by the detection unit does not reach the rated consistency, the nozzle is disconnected from the mixing barrel. When the concrete consistency detected by the detection unit reaches the rated consistency, the nozzle is connected to the mixing barrel.

[0015] Preferably, a detection tube is horizontally arranged at the bottom of the mixing barrel, a detection block is slidably arranged in the detection tube along the extension direction of the detection tube, a pressure-sensitive ring is fixedly arranged at the end of the detection tube away from the mixing barrel, and an air pump is connected to the side of the detection tube away from the mixing barrel. The air pump is used to extract the air in the detection tube and make the detection block slide in the detection tube. A timer is arranged on the detection tube. The timer is used to time the time taken for the detection block to move from one end of the detection tube to the other end, and a rated time threshold is set. When the detection block slides to the end of the detection tube where the pressure-sensitive ring is arranged, the pressure-sensitive ring detects pressure, the air pump stops running, and the timer stops timing.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. When the nozzle starts construction, the nozzle sprays concrete toward the retaining wall, and some concrete also falls from the retaining wall. The monitoring unit arranged under the nozzle can collect the fallen concrete. The four conveying wheels arranged in a trapezoidal shape have a sharp corner, which faces the retaining wall. The concrete falling from the retaining wall falls on the conveyor belt above the sharp corner. Since the conveyor belt keeps rotating after the nozzle is running, the conveyor belt can transport the fallen concrete to between two horizontally arranged conveying wheels at higher positions. The conveyor belt between the two conveying wheels is concave and curved, and a receiving wheel for receiving the conveyor belt is arranged below the conveyor belt in the concave curved shape. A pressure sensor is arranged on the receiving wheel. The rebound material received on the conveyor belt can be monitored by the pressure sensor on the receiving wheel when passing between the two higher conveying wheels. If the rebound amount is large, the rebound material is large, and the larger the value monitored by the pressure sensor, the larger the value, and the nozzle is adjusted accordingly. Compared with traditional monitoring units, the present invention not only ensures the accuracy of the monitored rebound value, but also extends the service life of the pressure sensor, thereby ensuring the stability of the monitoring unit when monitoring the rebound amount, and reducing the material loss caused by monitoring deviation during concrete spraying.

[0017] 2. The residual concrete on the conveyor belt is cleaned by the cleaning unit, which improves the accuracy of the pressure sensor in detecting the rebound amount. At the same time, a third rotary driver is arranged on one side of the nozzle, so that the third rotary driver first drives the nozzle to rotate within the rated working angle range and finds the corresponding angle when the standard rebound amount is met, thereby avoiding increasing the flow rate of the nozzle and reducing energy consumption.

[0018] 3. A mixing unit is provided and a detection unit is provided in the mixing unit. The consistency of the concrete in the mixing barrel is detected by the detection unit. The nozzle can spray the concrete only when the consistency of the concrete reaches the rated consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of a concrete wall spraying machine used in foundation pit construction.

[0020] Figure 2 It is a side view of a concrete wall spraying machine used in foundation pit construction.

[0021] Figure 3 It is a concrete wall spraying machine used in foundation pit construction. Figure 2 Schematic cross-sectional view at AA in the middle.

[0022] Figure 4 It is a cutaway stereoscopic schematic diagram of a concrete wall spraying machine used in foundation pit construction.

[0023] Figure 5 It is a concrete wall spraying machine used in foundation pit construction. Figure 4 A local enlarged schematic diagram of point B in the middle.

[0024] Figure 6 It is a concrete wall spraying machine used in foundation pit construction. Figure 4 A partial enlarged schematic diagram of point C in the middle.

[0025] Figure 7 It is a concrete wall spraying machine used in foundation pit construction. Figure 4 A partial enlarged schematic diagram of point D in the middle.

[0026] Figure 8 It is a three-dimensional schematic diagram of a concrete wall spraying machine used in foundation pit construction with some supports removed.

[0027] Fig. 9 It is a concrete wall spraying machine used in foundation pit construction. Figure 8 A partial enlarged schematic diagram of point E in the middle.

[0028] Fig.10 It is a concrete wall spraying machine used in foundation pit construction. Figure 8 A partial enlarged schematic diagram of point F in the middle.

[0029] Fig.11 It is a cutaway stereoscopic schematic diagram of a mixing unit of a concrete wall spraying machine used in foundation pit construction.

[0030] The numbers in the figure are: 1. Nozzle; 11. Third rotary drive; 2. Monitoring unit; 21. Conveyor belt; 211. Protruding block; 212. Engaging groove; 213. Engaging wheel; 214. Engaging block; 215. First rotary drive; 22. Receiver wheel; 23. Conveying wheel; 24. Lifting frame; 241. Extension rod; 25. Fixed plate; 26. Spring; 261. Corrugated sleeve; 27. Guide plate; 28. Second rotary drive; 29. ​​Cleaning unit; 291, cleaning roller; 292, sprinkler; 293, synchronous wheel; 294, synchronous belt; 3, bracket; 4, stirring unit; 41, stirring barrel; 42, stirring frame; 43, stirring plate; 44, driving unit; 441, fourth rotary driver; 442, gear ring; 443, gear; 45, inlet; 46, detection unit; 461, detection tube; 462, detection block; 463, pressure sensing ring; 464, air pump. DETAILED DESCRIPTION

[0031] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] Reference Figure 1-Figure 5 A concrete wall spraying machine for foundation pit construction, comprising a nozzle 1 and a bracket 3; a monitoring unit 2 for monitoring the rebound amount of concrete is arranged below the nozzle 1, the monitoring unit 2 is arranged on the bracket 3, the monitoring unit 2 comprises four conveying wheels 23 arranged in a trapezoidal structure, a conveying belt 21 is sleeved on the outside of the four conveying wheels 23, the conveying belt 21 is matched with the conveying wheels 23 in transmission, the upper part of the conveying belt 21 is used to receive and convey the rebound material of concrete, and among the four conveying wheels 23 arranged in a trapezoidal structure, two conveying wheels 23 at higher positions are arranged in the horizontal direction, A section of the conveyor belt 21 overlapped on two higher conveying wheels 23 is in a concave curved shape. The length of the conveyor belt 21 between the two higher conveying wheels 23 is greater than the straight-line distance between the two conveying wheels 23, and the length of the conveyor belt 21 between the two higher conveying wheels 23 remains unchanged. A receiving wheel 22 for receiving the conveyor belt 21 is provided at the lower part of the concave curved section of the conveyor belt 21. A pressure sensor is fixedly provided on the peripheral wall of the receiving wheel 22. The pressure sensor monitors the weight of the concrete rebound material received on the conveyor belt 21.

[0033] In the existing foundation pit construction, when the foundation pit retaining wall is poured by a concrete retaining wall spraying machine, concrete containing aggregate and water is usually sprayed on the retaining wall of the foundation pit through a nozzle 1. The concrete can stick to the retaining wall by its own viscosity. However, since the concrete is sprayed, it cannot be guaranteed that the concrete can stick to the retaining wall completely. After being sprayed by the nozzle 1, part of the concrete falls on the bottom of the foundation pit along the extension direction of the retaining wall. The ratio of the amount of concrete falling from the retaining wall to the total amount of concrete sprayed is the rebound amount, that is, the larger the rebound amount, the worse the adhesion of the concrete, and the greater the material loss of the concrete sprayed by the nozzle 1; conversely, if the rebound amount is smaller, it means that the adhesion of the concrete is better, and the concrete sprayed by the nozzle 1 has a greater material loss. The concrete adhesion mentioned above will be affected by the flow rate of the nozzle 1, the injection angle of the nozzle 1 and the consistency of the concrete, wherein the consistency of the concrete can be pre-configured, that is, the consistency of the concrete is an influencing factor that can be avoided in advance, and the injection flow rate and the injection angle of the nozzle 1 need to be adjusted in real time according to the rebound amount, wherein the effect of the size of the concrete injection flow rate on the rebound amount is uncertain, that is, the size of the injection flow rate needs to be adaptively adjusted according to the feedback of the rebound amount, such as increasing the injection flow rate first, if the rebound amount increases at this time, then reduce the injection flow rate until the minimum rebound amount is found, and then the nozzle 1 stops adjusting. The control principle of the spray angle of nozzle 1 is that after the initial spraying of nozzle 1, the sprayed concrete falls on the protective wall and slides down. At this time, the monitoring unit 2 monitors the sliding concrete and feeds back the rebound amount. A processor is provided on one side of the monitoring unit 2. The vertical feedback of the monitoring unit 2 is processed by the processor, that is, when the rebound amount is large, the spray angle of nozzle 1 increases. A minimum value is preset for the rebound amount monitored by the monitoring unit 2. When the actual monitored rebound amount is lower than the minimum value, the nozzle 1 does not change.

[0034] In order to ensure the accuracy of the monitoring unit 2 used to monitor the rebound amount, the monitoring unit 2 is further designed. In this article, the concrete that slides down to the bottom of the foundation pit is called rebound material, and the monitoring unit 2 monitors the weight of the rebound material. When the nozzle 1 starts construction, the nozzle 1 sprays concrete onto the retaining wall, and some concrete also falls from the retaining wall. The monitoring unit 2 arranged below the nozzle 1 can collect the fallen concrete. The four conveying wheels 23 arranged in a trapezoidal shape have a sharp corner, and the sharp corner faces the retaining wall. The concrete that falls from the retaining wall falls on the conveyor belt 21 above the sharp corner. Since the conveyor belt 21 keeps rotating after the nozzle 1 is running, the conveyor belt 21 can transport the fallen concrete to between the two horizontally arranged conveying wheels 23 at a higher position. The conveyor belt 21 between the two conveying wheels 23 is concave and curved, and a device for receiving the conveyor belt 21 is provided below the conveyor belt 21 in the concave curve. The receiving wheel 22 is provided with a pressure sensor. The rebound material received on the conveyor belt 21 can be monitored by the pressure sensor on the receiving wheel 22 when passing between two higher conveying wheels 23. If the rebound amount is large, the rebound material is large, and the value monitored by the pressure sensor is larger. At this time, the nozzle 1 needs to be adjusted according to the adjustment method described above. There is a standard amount preset for the rebound amount of concrete. The rebound amount standard in the industry standard is 15%. In actual construction, the staff can set the rebound amount according to actual needs. When the rebound amount monitored by the monitoring unit 2 is lower than the standard amount, the nozzle 1 will not make corresponding adjustments. Only when the actual rebound amount is higher than the standard amount, the nozzle 1 will make corresponding adjustments. Compared with the traditional monitoring unit 2 in which the pressure sensor is directly arranged under the guard wall, the pressure sensor of the monitoring unit 2 in the present invention is arranged away from the guard wall. This is because if the pressure sensor is directly arranged under the guard wall, the aggregate carried in the falling concrete will continuously collide with the pressure sensor, and the aggregate also has inertia due to its own gravity, so the numerical error read by the pressure sensor is large and the life is short. The present invention not only ensures the accuracy of the monitored rebound value, but also extends the service life of the pressure sensor, thereby ensuring the stability of the monitoring unit 2 when monitoring the rebound amount, and reducing the material loss caused by monitoring deviation during concrete spraying.

[0035] Reference Figure 4 and Figure 5 A plurality of protruding blocks 211 are evenly and fixedly arranged in an annular structure around the outer periphery of the conveyor belt 21 , and gaps for placing rebound materials are provided between the protruding blocks 211 .

[0036] Since the rebound material contains some concrete fluid in a flowing state in addition to aggregates, by providing a protruding block 211 on the conveyor belt 21, the fluid falling on the conveyor belt 21 will not fall from the conveyor belt 21 due to the inclination angle of the conveyor belt 21, thereby causing a deviation in the weight of the rebound material monitored by the final pressure sensor.

[0037] Reference Figure 2 and Fig. 9 : Engaging grooves 212 are evenly opened on the inner ring side of the conveyor belt 21, and an engaging wheel 213 is fixedly arranged at the end of the conveying wheel 23. Engaging blocks 214 are evenly fixedly arranged on the peripheral wall of the engaging wheel 213 around the axis of the engaging wheel 213, and the engaging blocks 214 are meshed with the engaging grooves 212.

[0038] By providing the meshing groove 212 and the meshing wheel 213 with the meshing block 214, the conveyor belt 21 will not rotate relative to the conveyor wheel 23 when rotating, ensuring that the length of the conveyor belt 21 between the two conveyor wheels 23 at a higher position remains unchanged. If the meshing wheel 213 and the meshing groove 212 are not provided, when the conveyor wheel 23 drives the conveyor belt 21 to rotate, the conveyor wheel 23 and the conveyor belt 21 will slip, and it is impossible to ensure that the length of the conveyor belt 21 between the two conveyor wheels 23 at a higher position remains unchanged. A first rotation driver 215 is provided at the end of one of the meshing wheels 213, and the first rotation driver 215 is provided on the bracket 3. The first rotation driver 215 is used to drive the meshing wheel 213 to rotate, thereby rotating the conveyor wheel 23 and finally rotating the conveyor belt 21.

[0039] Reference Figure 2 and Fig. 9 A lifting frame 24 is arranged at the end of the receiving wheel 22. The lifting frame 24 passes through the side of the bracket 3 in the horizontal direction and moves on the bracket 3 in the vertical direction. An extension rod 241 is fixedly arranged in the vertical direction on the upper part of the lifting frame 24. A fixing plate 25 is arranged on the upper part of the lifting frame 24. The fixing plate 25 is horizontally fixed on the side wall of the bracket 3. The extension rod 241 passes through the fixing plate 25 and slidably cooperates with the fixing plate 25. There is a gap between the upper part of the extension rod 241 and the upper part of the fixing plate 25. A spring 26 is arranged in the gap along the extension direction of the extension rod 241. The two ends of the spring 26 are fixedly connected to the upper end of the extension rod 241 and the upper part of the fixing plate 25 respectively.

[0040] In this way, the receiving wheel 22 is not fixed on the bracket 3, but can be raised and lowered synchronously with the lifting frame 24 in the vertical direction, ensuring that the receiving wheel 22 can always be in contact with the lower part of the conveyor belt 21. In order to ensure that the spring 26 can work normally without being affected by concrete falling from the outside, a corrugated sleeve 261 is provided on the outer periphery of the spring 26, and the two ends of the corrugated sleeve 261 are fixedly connected to the upper end surface of the extension rod 241 and the upper part of the fixed plate 25 respectively.

[0041] Reference Figure 8 and Fig.10 : The trapezoidal structure formed by the four conveying wheels 23 has an angle, and the sharp corner faces the foundation pit retaining wall. A guide plate 27 is inclined at the front end of the sharp corner, and the guide plate 27 is inclined toward the conveyor belt 21. The falling rebound material first falls on the guide plate 27 and then falls on the conveyor belt 21.

[0042] In this way, after the nozzle 1 sprays the concrete, part of the sprayed concrete is first received by the guide plate 27 after falling from the protective wall, and then guided to the conveyor belt 21 by the guide plate 27. If the conveyor belt 21 is used to directly receive the fallen rebound material, due to the presence of aggregates in the concrete, the weight of the aggregates is relatively large. During the falling process, the aggregates will have a large impact on the conveyor belt 21 when they contact the conveyor belt 21, which will inevitably cause the conveyor belt 21 to be damaged after long-term use. The guide plate 27 is arranged at the front end of the conveyor belt 21 to guide the rebound material, so that the guide plate 27 releases the force of the falling rebound material and then guides it to the conveyor belt 21, thereby extending the life of the conveyor belt 21. According to the use requirements, a second rotary driver 28 can be arranged at the end of the guide plate 27. The second rotary driver 28 is preferably a servo motor. The second rotary driver 28 is used to drive the guide plate 27 to reciprocate within an angle range, thereby achieving the shaking effect of the guide plate 27, so that the rebound material on the guide plate 27 is more likely to fall onto the conveyor belt 21.

[0043] Reference Figure 3 , Figure 6 and Fig. 9 A cleaning unit 29 is provided below the conveyor belt 21. The cleaning unit 29 includes a cleaning roller 291 rotatably provided below the conveyor belt 21. The axial direction of the cleaning roller 291 is parallel to the axial direction of the conveying wheel 23. A water sprayer 292 is provided on one side of the cleaning roller 291. The water sprayer 292 sprays clean water on the outer ring side of the conveyor belt 21. The cleaning roller 291 is always in contact with the outer ring side of the conveyor belt 21.

[0044] The conveyor belt 21 discharges the rebound material after receiving it and passing through the receiving wheel 22, but some rebound material still remains on the conveyor belt 21. In this case, the residual rebound material needs to be cleaned up, otherwise, when the concrete solidifies, the weight of the conveyor belt 21 will increase, thereby affecting the final rebound monitoring result. The cleaning unit 29 is also provided with a synchronous wheel 293 and a synchronous belt 294. Two synchronous wheels 293 are provided. The two synchronous wheels 293 are respectively arranged at one end of one of the conveying wheels 23 and one end of the cleaning roller 291. The synchronous belt 294 is sleeved on the two synchronous wheels 293, and the two synchronous wheels 293 are connected by the synchronous belt 294. In this way, when the conveying wheel 23 rotates, the cleaning roller 291 rotates synchronously with the conveying wheel 23. Due to the transmission of the synchronous belt 294, the rotation tangent direction of the cleaning roller 291 close to the conveying belt 21 is opposite to the conveying direction of the conveying belt 21, thereby improving the relative friction effect between the cleaning roller 291 and the conveying belt 21.

[0045] Reference Figure 1 and Figure 2 : 7. According to claim X, a concrete wall spraying machine for foundation pit construction is characterized in that a third rotary drive 11 is arranged on one side of the nozzle 1, and the third rotary drive 11 is used to drive the nozzle 1 to rotate. The rotation angle of the nozzle 1 is preset with a rated working angle range. When the third rotary drive 11 drives the nozzle 1 to rotate, the angle of the nozzle 1 is always within the rated working angle range.

[0046] The third rotary driver 11 is preferably a servo motor. After the nozzle 1 sprays concrete, the concrete falls on the retaining wall in a parabolic state. If the angle of the nozzle 1 is too high, the concrete will move on the ground before reaching the retaining wall, which will also reduce the distance moved in the horizontal direction. In order to avoid the above situation during the rotation of the nozzle 1, the rotation angle of the nozzle 1 is preset. The specific value of the rated working angle range needs to be determined according to the actual situation. When the rebound amount is large, the third rotary driver 11 drives the nozzle 1 to rotate within the rated working angle range. The monitoring unit 2 monitors the rebound amount in real time. When the rebound amount reaches the minimum, the angle of the nozzle 1 no longer changes. When the nozzle 1 changes its angle, the flow rate of the nozzle 1 does not change. Changing the angle to improve the rebound amount consumes less energy than changing the flow rate. This is because in most cases, the large rebound amount is due to the low flow rate of the nozzle 1. In this case, the flow rate of the nozzle 1 needs to be increased, but increasing the flow rate will increase the energy consumption. By changing the angle of the nozzle 1, it is only necessary to power the third rotary driver 11. If the nozzle 1 finds a rebound amount that meets the standard amount within the rated working angle range, there is no need to adjust the flow rate of the nozzle 1.

[0047] Reference Figure 2-Figure 5 and Figure 7 A stirring unit 4 connected to the nozzle 1 is arranged on one side of the nozzle 1, and the stirring unit 4 includes a horizontally arranged stirring barrel 41, and a stirring frame 42 is rotatably arranged in the stirring barrel 41. The stirring frame 42 is a cylindrical frame structure, and a plurality of stirring plates 43 are evenly fixedly arranged on the stirring frame 42 around the axis of the stirring frame 42.

[0048] A driving unit 44 for driving the stirring frame 42 to rotate is provided at the end of the stirring frame 42, and the driving unit 44 includes a fourth rotation driver 441, a gear 443 and a gear ring 442. The gear ring 442 is fixedly provided at the end of the stirring frame 42, and the gear 443 is rotatably provided on one side of the gear 443. The gear 443 and the gear ring 442 are meshed with each other. The fourth rotation driver 441 is provided at the end of the gear 443, and the fourth rotation driver 441 is used to drive the gear 443 to rotate. The fourth rotation driver 441 is preferably a servo motor. An inlet 45 is provided at the end of the mixing barrel 41, and concrete containing aggregate and water are added in proportion from the inlet 45. When the nozzle 1 is sprayed, the mixing barrel 41 is in a continuous stirring state, thereby ensuring that the consistency of the concrete is relatively uniform.

[0049] Reference Figure 8 : A detection unit 46 is provided at the bottom of the mixing barrel 41. The detection unit 46 is used to detect the consistency of the concrete in the mixing barrel 41. The detection unit 46 is preset with a rated consistency. When the concrete consistency detected by the detection unit 46 does not reach the rated consistency, the nozzle 1 is disconnected from the mixing barrel 41. When the concrete consistency detected by the detection unit 46 reaches the rated consistency, the nozzle 1 is connected to the mixing barrel 41.

[0050] Reference Fig.11 : A detection tube 461 is horizontally arranged at the bottom of the mixing barrel 41, and a detection block 462 is slidably arranged in the detection tube 461 along the extension direction of the detection tube 461. A pressure-sensitive ring 463 is fixedly arranged at the end of the detection tube 461 away from the mixing barrel 41, and an air pump 464 is connected to the side of the detection tube 461 away from the mixing barrel 41. The air pump 464 is used to extract the air in the detection tube 461 and make the detection block 462 slide in the detection tube 461. A timer is arranged on the detection tube 461. The timer is used to time the time taken for the detection block 462 to move from one end of the detection tube 461 to the other end, and a rated time threshold is set. When the detection block 462 slides to the end of the detection tube 461 where the pressure-sensitive ring 463 is arranged, the pressure-sensitive ring 463 detects pressure, the air pump 464 stops running, and the timer stops timing.

[0051] When the concrete in the mixing barrel 41 is stirred by the stirring plate 43, the detection unit 46 extracts the stirring concrete for detection. During the detection, the air pump 464 drives the detection block 462 located in the detection tube 461. The air pressure detected by the air pump 464 is constant. When the concrete consistency is large, the detection block 462 moves in the detection tube 461 for a long time. When the concrete consistency is small, the detection block 462 moves in the detection tube 461 for a short time. By timing the movement time of the detection block 462 in the detection tube 461, the consistency of the concrete is judged. When the time counted by the timer is within the rated time threshold, the nozzle 1 is connected to the mixing barrel 41, and the nozzle 1 starts to spray concrete. In the process of the nozzle 1 spraying, the mixing frame 42 is in a continuous stirring state.

[0052] Working principle: In this paper, the concrete that slides down to the bottom of the foundation pit is called rebound material. The monitoring unit 2 monitors the weight of the rebound material. When the nozzle 1 starts construction, the nozzle 1 sprays concrete onto the retaining wall. At the same time, some concrete falls from the retaining wall. The monitoring unit 2 arranged below the nozzle 1 can collect the fallen concrete. The four conveying wheels 23 arranged in a trapezoidal shape have a sharp corner, which faces the retaining wall. The concrete falling from the retaining wall falls on the conveyor belt 21 above the sharp corner. Since the conveyor belt 21 keeps rotating after the nozzle 1 is running, the conveyor belt 21 can convey the fallen concrete to between the two horizontally arranged conveying wheels 23 at a higher position, and the conveyor located between the two conveying wheels 23 The conveyor belt 21 is in a concave curved shape, and a receiving wheel 22 for receiving the conveyor belt 21 is arranged below the conveyor belt 21 in the concave curved shape. A pressure sensor is arranged on the receiving wheel 22. The rebound material received on the conveyor belt 21 can be monitored by the pressure sensor on the receiving wheel 22 when passing between two higher conveyor wheels 23. If the rebound amount is large, there will be more rebound material, and the larger the value monitored by the pressure sensor, the larger the value monitored by the pressure sensor. At this time, the nozzle 1 needs to be adjusted according to the adjustment method described above. A standard amount is preset for the rebound amount of concrete. When the rebound amount monitored by the monitoring unit 2 is lower than the standard amount, the nozzle 1 will not make corresponding adjustments. Only when the actual rebound amount is higher than the standard amount, the nozzle 1 will make corresponding adjustments. Compared with the traditional monitoring unit 2 in which the pressure sensor is directly arranged under the guard wall, the pressure sensor of the monitoring unit 2 in the present invention is arranged away from the guard wall. This is because if the pressure sensor is directly arranged under the guard wall, the aggregate carried in the falling concrete will continuously collide with the pressure sensor, and the aggregate also has inertia due to its own gravity, so the numerical error read by the pressure sensor is large and the life is short. The present invention not only ensures the accuracy of the monitored rebound value, but also extends the service life of the pressure sensor, thereby ensuring the stability of the monitoring unit 2 when monitoring the rebound amount, and reducing the material loss caused by monitoring deviation during concrete spraying.

[0053] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the protection scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A concrete wall spraying machine for foundation pit construction, comprising a spray head (1) and a bracket (3); It is characterized in that A monitoring unit (2) for monitoring the rebound amount of concrete is arranged below the nozzle (1). The monitoring unit (2) is arranged on a bracket (3). The monitoring unit (2) comprises four conveying wheels (23) arranged in a trapezoidal structure. A conveying belt (21) is sleeved on the outside of the four conveying wheels (23). The conveying belt (21) and the conveying wheels (23) are in driving cooperation. The upper part of the conveying belt (21) is used to receive and convey the rebound material of concrete. Among the four conveying wheels (23) arranged in a trapezoidal structure, two conveying wheels (23) at higher positions are arranged in a horizontal direction and overlapped on the two conveying wheels (23) at higher positions. A section of the conveyor belt (21) on the conveyor belt (23) is in a concave curved shape, the length of the conveyor belt (21) between two higher conveyor wheels (23) is greater than the straight-line distance between the two conveyor wheels (23), and the length of the conveyor belt (21) between the two higher conveyor wheels (23) remains unchanged. A receiving wheel (22) for receiving the conveyor belt (21) is provided at the lower part of the concave curved section of the conveyor belt (21), and a pressure sensor is fixedly provided on the peripheral wall of the receiving wheel (22), and the pressure sensor monitors the weight of the concrete rebound material received on the conveyor belt (21).

2. A concrete wall spraying machine for foundation pit construction according to claim 1, characterized in that: A plurality of protruding blocks (211) are evenly and fixedly arranged on the outer circumference of the conveyor belt (21) and around the annular structure of the conveyor belt (21), and gaps for placing rebound material are present between the protruding blocks (211).

3. A concrete wall spraying machine for foundation pit construction according to claim 1, characterized in that: Engaging grooves (212) are evenly provided on the inner ring side of the conveyor belt (21), an engaging wheel (213) is fixedly provided at the end of the conveyor wheel (23), and engaging blocks (214) are evenly fixedly provided on the peripheral wall of the engaging wheel (213) around the axis of the engaging wheel (213), and the engaging blocks (214) are engaged with the engaging grooves (212) mutually.

4. A concrete wall spraying machine for foundation pit construction according to claim 1, characterized in that: A lifting frame (24) is arranged at the end of the receiving wheel (22). The lifting frame (24) passes through the side of the bracket (3) in the horizontal direction and moves on the bracket (3) in the vertical direction. An extension rod (241) is fixedly arranged in the vertical direction on the upper part of the lifting frame (24). A fixing plate (25) is arranged on the upper part of the lifting frame (24). The fixing plate (25) is fixedly arranged horizontally on the side wall of the bracket (3). The extension rod (241) passes through the fixing plate (25) and is slidably matched with the fixing plate (25). There is a gap between the upper part of the extension rod (241) and the upper part of the fixing plate (25). A spring (26) is arranged in the gap along the extension direction of the extension rod (241). The two ends of the spring (26) are respectively fixedly connected to the upper end of the extension rod (241) and the upper part of the fixing plate (25).

5. The concrete wall spraying machine for foundation pit construction according to claim 1 is characterized in that: The trapezoidal structure formed by the four conveying wheels (23) has an angle, the sharp corner faces the foundation pit retaining wall, and a guide plate (27) is inclined at the front end of the sharp corner, the guide plate (27) is inclined toward the conveyor belt (21), and the falling rebound material first falls on the guide plate (27) and then falls on the conveyor belt (21).

6. A concrete wall spraying machine for foundation pit construction according to claim 1, characterized in that: A cleaning unit (29) is arranged below the conveyor belt (21). The cleaning unit (29) comprises a cleaning roller (291) rotatably arranged below the conveyor belt (21). The axial direction of the cleaning roller (291) is parallel to the axial direction of the conveyor wheel (23). A water sprayer (292) is arranged on one side of the cleaning roller (291). The water sprayer (292) sprays clean water on the outer ring side of the conveyor belt (21). The cleaning roller (291) is always in contact with the outer ring side of the conveyor belt (21).

7. The concrete wall spraying machine for foundation pit construction according to claim 1, characterized in that: A third rotary drive (11) for driving the nozzle (1) to rotate is provided on one side of the nozzle (1), the rotation angle of the nozzle (1) being preset with a rated working angle range, and when the third rotary drive (11) drives the nozzle (1) to rotate, the angle of the nozzle (1) is always within the rated working angle range.

8. The concrete wall spraying machine for foundation pit construction according to claim 1, characterized in that: A stirring unit (4) connected to the nozzle (1) is arranged on one side of the nozzle (1), the stirring unit (4) comprising a stirring barrel (41) arranged horizontally, a stirring frame (42) rotatably arranged in the stirring barrel (41), the stirring frame (42) being a cylindrical frame structure, a plurality of stirring plates (43) being evenly fixedly arranged on the stirring frame (42) around the axis of the stirring frame (42).

9. A concrete wall spraying machine for foundation pit construction according to claim 8, characterized in that: A detection unit (46) is provided at the bottom of the mixing barrel (41). The detection unit (46) is used to detect the consistency of the concrete in the mixing barrel (41). The detection unit (46) is preset with a rated consistency. When the concrete consistency detected by the detection unit (46) does not reach the rated consistency, the nozzle (1) is disconnected from the mixing barrel (41). When the concrete consistency detected by the detection unit (46) reaches the rated consistency, the nozzle (1) is connected to the mixing barrel (41).

10. A concrete wall spraying machine for foundation pit construction according to claim 9, characterized in that: A detection tube (461) is horizontally arranged at the bottom of the stirring barrel (41), a detection block (462) is slidably arranged in the detection tube (461) along the extension direction of the detection tube (461), a pressure-sensitive ring (463) is fixedly arranged at the end of the detection tube (461) away from the stirring barrel (41), an air pump (464) is connected to the side of the detection tube (461) away from the stirring barrel (41), the air pump (464) is used to extract air from the detection tube (461) and make the detection block (462) slide in the detection tube (461), a timer is arranged on the detection tube (461), the timer is used to count the time taken for the detection block (462) to move from one end of the detection tube (461) to the other end, and a rated time threshold is set, when the detection block (462) slides to the end of the detection tube (461) where the pressure-sensitive ring (463) is arranged, the pressure is detected by the pressure-sensitive ring (463), the air pump (464) stops running, and the timer stops timing.

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