阅读说明：本技术 一种混凝土输送状态的监测装置和方法 (Concrete conveying state monitoring device and method ) 是由 龚俊 宋祖源 伍锡文 高洋 于 2020-12-22 设计创作，主要内容包括：本发明公开了一种混凝土输送状态的监测装置和方法,监测装置包括至少一个监测单元,监测单元包括安装座、应变片和传力组件,所述安装座安装于待监测混凝土输送管道上开设的安装孔中,所述传力组件连接于安装座上,并与安装座围合成一安装腔,所述传力组件包括挡设于安装腔一侧并与待监测混凝土接触的随动部,所述应变片设置于安装腔内或随动部中朝向安装腔内的一侧面上。本发明的混凝土输送状态的监测装置具有结构简单、经济实用和测量结果准确可靠等优点,使用该监测装置的监测方法同样具备上述优点。(The invention discloses a device and a method for monitoring a concrete conveying state, wherein the monitoring device comprises at least one monitoring unit, the monitoring unit comprises a mounting seat, a strain gauge and a force transmission assembly, the mounting seat is mounted in a mounting hole formed in a concrete conveying pipeline to be monitored, the force transmission assembly is connected to the mounting seat and forms a mounting cavity with the mounting seat in an enclosing mode, the force transmission assembly comprises a follow-up part which is arranged on one side of the mounting cavity in a blocking mode and is in contact with the concrete to be monitored, and the strain gauge is arranged in the mounting cavity or on one side face, facing the inside of the mounting cavity, of the follow-up part. The monitoring device for the concrete conveying state has the advantages of simple structure, economy, practicality, accurate and reliable measuring result and the like, and the monitoring method using the monitoring device also has the advantages.)

1. The utility model provides a monitoring devices of concrete conveying state, includes at least one monitoring unit, its characterized in that: the monitoring unit includes mount pad (1), foil gage (2) and biography power subassembly (3), mount pad (1) is installed in waiting to monitor the mounting hole of offering on the concrete conveying pipeline, biography power subassembly (3) are connected on mount pad (1) to enclose into a installation cavity with mount pad (1), biography power subassembly (3) locate installation cavity one side and with follow-up portion (31) that wait to monitor concrete and contact including keeping off, foil gage (2) set up in installation cavity or follow-up portion (31) on the side of orientation installation cavity in.

2. The apparatus for monitoring a concrete delivery state according to claim 1, wherein: and a convex part (311) is arranged on the side surface of the follow-up part (31) facing the interior of the conveying pipeline.

3. The concrete delivery state monitoring device according to claim 1 or 2, wherein: the force transmission assembly (3) further comprises a connecting rod (32), a nut (33) and an elastic piece (34), one end of the connecting rod (32) is connected with the follow-up portion (31), the rod body penetrates through a through hole (11) formed in the mounting seat (1) and is in clearance fit with the through hole, the end portion penetrating out of the mounting seat (1) is in threaded fit with the nut (33), and the elastic piece (34) is supported between the nut (33) and the mounting seat (1).

4. The apparatus for monitoring a concrete delivery state according to claim 3, wherein: the strain gauge is characterized in that the strain gauge (2) is provided with a plurality of strain gauges (2), and the plurality of strain gauges (2) are uniformly arranged around the axial direction of the connecting rod (32).

5. The apparatus for monitoring a concrete delivery state according to claim 3, wherein: the end part of the mounting seat (1) facing the interior of the conveying pipeline is provided with an inner concave area matched with the shape of the follow-up part (31), and the follow-up part (31) is embedded in the inner concave area.

6. The apparatus for monitoring a concrete delivery state according to claim 3, wherein: the edge of follow-up portion (31) is equipped with bellied flange (312) to mount pad (1) one side, the tip towards in the pipeline in mount pad (1) is equipped with the recess with flange (312) shape adaptation, flange (312) are inlayed and are located in the recess.

7. The apparatus for monitoring a concrete delivery state according to claim 2, wherein: pass power subassembly (3) still including installation section of thick bamboo (35), tip department in mount pad (1) orientation pipeline is equipped with connects one, be equipped with on installation section of thick bamboo (35) and connect the two portions of being connected of one cooperation, the bottom surface of installation section of thick bamboo (35) is outside bellied follow-up portion (31), follow-up portion (31) set up flexible deformation piece in bellying (311) both sides, foil gage (2) attached in the inboard of flexible deformation piece.

8. The apparatus for monitoring a concrete delivery state according to claim 1, wherein: the mounting seat (1) is provided with a through wire passing hole (12), and the wiring (21) of the strain gauge (2) penetrates out of the mounting seat (1) through the wire passing hole (12).

9. The apparatus for monitoring a concrete delivery state according to claim 1, wherein: the monitoring unit is equipped with a plurality ofly, and is a plurality of the monitoring unit is arranged along pipeline axial.

10. A method of monitoring using the concrete delivery state monitoring device according to claim 9, comprising the steps of:

s1: the method comprises the following steps that a plurality of monitoring units are arranged along the axial direction of a concrete conveying pipeline to be monitored, and each monitoring unit sends acquired monitoring information containing a pressure value to a monitoring system;

s2: the monitoring system receives the monitoring information acquired by each monitoring unit, and when the difference of the pressure values in the monitoring information of two adjacent monitoring units is larger than a safety set value, the monitoring system outputs alarm information and position information of the two monitoring units.

Technical Field

The invention relates to the technical field of material monitoring equipment, in particular to a device and a method for monitoring a concrete conveying state.

Background

In the concrete conveying process, the conveying pressure of the concrete is gradually reduced under the action of the friction resistance of the pipeline, particularly when the concrete passes through a plurality of bent pumping pipelines; simultaneously, the selection of the mix proportion of concrete also influences the transport state of concrete greatly, and the concrete moisture is few can lead to viscosity big, and on the way frictional resistance can greatly increased, and stifled pipe risk also can greatly increased, and this will waste a large amount of manpowers and time to go to handle, delays the construction progress. Therefore, the measurement of parameters such as on-way pressure loss, flow velocity, pressure and the like in the concrete flowing process is particularly important for the research on the pumpability of the concrete, and the timely prevention and alarm of pipe blockage also bring visual economic benefits to construction.

The external expansion pressure generated by the concrete in the pumping process can cause the conveying pipeline to slightly deform, and by utilizing the principle, the existing monitoring means can directly stick a strain gauge in the wall of the original conveying pipeline for measurement, but the strain gauge is directly contacted with the concrete in the mode, and if other corrosive media are added into the concrete, the service life of the strain gauge is greatly shortened; the strain gauge does not have strong wear resistance generally, and the friction with concrete can damage a testing device, so the strain gauge is not practical; in addition, the pipe wall of the conveying pipeline is not thick and has large deformation error, and vibration exists in the pumping process, so that the measured data is inaccurate, the conveying pressure and the pipeline loss can only be roughly tested, and the flow speed, the flow and the accurate pipeline loss cannot be tested. At present, a scheme for judging the pumpability of concrete by measuring the slump, the expansion and the like of the concrete also exists, but the scheme does not form a quantitative parameter through the judgment of experience, and the measurement result has large errors. In addition, the conveying state is judged in a manual mode, the mode excessively depends on manual experience, the concrete conveying state cannot be effectively monitored, the pipe blocking risk is not controllable, and the concrete conveying state cannot be processed in time, so that delay time after pipe blocking is extremely long, and solidification and blockage of the whole pipe due to delay of time are possibly caused.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a monitoring device for the concrete conveying state, which has a simple structure, is economical and practical, and has accurate and reliable measuring results, and a method for monitoring by using the monitoring device.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

the utility model provides a monitoring devices of concrete conveying state, includes at least one monitoring unit, and monitoring unit includes mount pad, foil gage and biography power subassembly, the mount pad is installed in waiting to monitor the mounting hole of seting up on the concrete conveying pipeline, biography power subassembly is connected on the mount pad to enclose synthetic installation cavity with the mount pad, biography power subassembly is including keeping off the follow-up portion of locating installation cavity one side and with waiting to monitor concrete contact, the foil gage sets up in installation cavity or follow-up portion in the side of orientation installation cavity.

As a further improvement of the above technical solution:

and a convex part is arranged on the side surface of the follow-up part facing the conveying pipeline.

The force transmission assembly further comprises a connecting rod, a nut and an elastic piece, one end of the connecting rod is connected with the follow-up portion, the rod body penetrates through a through hole formed in the mounting seat and is in clearance fit with the through hole, the end portion penetrating out of the mounting seat is in threaded fit with the nut, and the elastic piece is supported between the nut and the mounting seat.

The strain gauge is provided with a plurality of, a plurality of the strain gauge is evenly arranged around the axial direction of connecting rod.

The end part of the mounting seat facing the interior of the conveying pipeline is provided with an inner concave area matched with the shape of the follow-up part, and the follow-up part is embedded in the inner concave area.

The edge of follow-up portion is equipped with the bellied flange to mount pad one side, the tip towards in the pipeline in the mount pad is equipped with the recess with flange shape adaptation, the flange inlays and locates in the recess.

The power transmission assembly further comprises an installation cylinder, a connection portion is arranged at the end portion of the installation seat facing the interior of the conveying pipeline, a connection portion matched and connected with the connection portion is arranged on the installation cylinder, a follow-up portion protruding outwards is arranged on the bottom surface of the installation cylinder, flexible deformation pieces are arranged on two sides of the protruding portion of the follow-up portion, and the strain pieces are attached to the inner sides of the flexible deformation pieces.

The mounting seat is provided with a through wire passing hole, and the wiring of the strain gauge penetrates out of the mounting seat through the wire passing hole.

The monitoring unit is equipped with a plurality ofly, and is a plurality of the monitoring unit is arranged along pipeline axial.

A method for monitoring by using the monitoring device for the concrete conveying state comprises the following steps:

s1: the method comprises the following steps that a plurality of monitoring units are arranged along the axial direction of a concrete conveying pipeline to be monitored, and each monitoring unit sends acquired monitoring information containing a pressure value to a monitoring system;

s2: the monitoring system receives the monitoring information acquired by each monitoring unit, and when the difference of the pressure values in the monitoring information of two adjacent monitoring units is larger than a safety set value, the monitoring system outputs alarm information and position information of the two monitoring units.

Compared with the prior art, the invention has the advantages that:

the monitoring device for the concrete conveying state comprises at least one monitoring unit, wherein the monitoring unit comprises a mounting seat, a strain gauge and a force transmission assembly, the mounting seat is mounted in a mounting hole formed in a concrete conveying pipeline to be monitored, the force transmission assembly is connected to the mounting seat and forms a mounting cavity with the mounting seat in an enclosing mode, the force transmission assembly comprises a follow-up portion which is arranged on one side of the mounting cavity in a blocking mode and is in contact with the concrete to be monitored, and the strain gauge is arranged in the mounting cavity or on one side face, facing the inside of the mounting cavity, of the follow-up portion. When the concrete generates external expansion tension in the pipeline conveying process, the follow-up part is triggered, and due to the movable connection arrangement of the follow-up part, certain movement is generated by the triggering so as to transmit force to the strain gauge, so that the characteristic value of the strain gauge is changed, and the conveying state of the concrete in the conveying pipeline is obtained according to the change of the characteristic value. The setting mode isolates the strain gauge from direct contact with concrete by using the follow-up part, so that the abrasion of the strain gauge is avoided, the service life of the strain gauge is prolonged, the measurement accuracy of the strain gauge is ensured, and the problem of monitoring the flow state in the concrete pumping process is effectively solved.

The method for monitoring by using the monitoring device of the concrete conveying state has the advantages, when the blockage occurs, the alarm can be given in time, the position of the blockage can be output and sent, and workers can deal with the blockage in time to avoid concrete solidification.

Drawings

FIG. 1 is a schematic view showing the structure of a concrete feeding state monitoring apparatus according to example 1;

FIG. 2 is a schematic view showing the structure of a concrete feeding state monitoring apparatus according to example 2;

FIG. 3 is a schematic view showing the arrangement positions of strain gauges in the concrete transportation state monitoring apparatus according to example 2;

FIG. 4 is a schematic view showing the principle of the force applied to the follower portion of the concrete feeding state monitoring apparatus according to embodiment 2;

fig. 5 is a schematic structural view of a concrete conveying state monitoring device according to embodiment 3.

Illustration of the drawings: 1. a mounting seat; 11. a through hole; 12. a wire passing hole; 2. a strain gauge; 21. wiring; 3. a force transfer assembly; 31. a follow-up section; 311. a boss portion; 312. blocking edges; 32. a connecting rod; 33. a nut; 34. an elastic member; 35. and (6) mounting the cylinder.

Detailed Description

In order to facilitate understanding of the invention, the invention will be described more fully and in detail with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.

Example 1:

as shown in fig. 1, the monitoring device for the concrete conveying state of the embodiment includes at least one monitoring unit, the monitoring unit includes a mounting seat 1, a strain gauge 2 and a force transmission assembly 3, the mounting seat 1 is installed in a mounting hole formed in a concrete conveying pipeline to be monitored, the force transmission assembly 3 is connected to the mounting seat 1 and forms a mounting cavity with the mounting seat 1, the force transmission assembly 3 includes a follow-up portion 31 which is arranged on one side of the mounting cavity and is in contact with the concrete to be monitored, and the strain gauge 2 is arranged in the mounting cavity or on the follow-up portion 31. When the concrete generates external expansion force in the pipeline conveying process, the follow-up part 31 is triggered, and due to the movable connection arrangement of the follow-up part 31, certain movement is generated by the triggering so as to transmit the force to the strain gauge 2, so that the characteristic value of the strain gauge is changed, and the conveying state of the concrete in the conveying pipeline is obtained according to the value change. The setting mode isolates the strain gauge 2 from the direct contact of concrete by using the follow-up part 31, so that the abrasion of the strain gauge 2 is avoided, the service life of the strain gauge is prolonged, the measurement accuracy of the strain gauge 2 is ensured, and the problem of monitoring the flow state in the concrete pumping process is effectively solved. The follow-up portion 31 is made by wear-resisting material, effectively reduces the damage that causes after contacting with the concrete, improves the holistic life of device.

In this embodiment, strain gauge 2 is provided with a plurality ofly, and the numerical value change that a plurality of strain gauges 2 obtained can verify each other, has not only improved measuring result's accuracy, when certain strain gauge 2 broke down simultaneously, also can compare the numerical value of getting rid of the trouble fast according to the numerical value between a plurality of strain gauges 2.

In this embodiment, the force transmission assembly 3 further includes a connecting rod 32, a nut 33 and an elastic member 34, one end of the connecting rod 32 is connected to the following portion 31, and the rod body passes through the through hole 11 formed in the mounting seat 1 and is in clearance fit with the through hole, so that the connecting rod 32 has a certain movement space but a small radial movement amount. The end part penetrating through the mounting seat 1 is in threaded fit with the nut 33, and an elastic part 34 is supported between the nut 33 and the mounting seat 1. The elastic piece 34 ensures that a certain movement allowance exists between the follow-up part 31 and the mounting seat 1 so as to play a role in force transmission; the screw-thread fit between the nut 33 and the connecting rod 32 can quickly adjust the pretightening force of the elastic part 34, so that the monitoring unit is integrally suitable for different monitoring environments and monitoring situations.

In this embodiment, a countersunk head is disposed at the through hole 11 of the mounting base 1 to accommodate the elastic member 34 and limit the elastic member 34 to deform only along the axial direction of the connecting rod 32. A gasket is arranged between the nut 33 and the mounting seat 1 in a cushioning mode, and the follow-up portion 31 is prevented from being influenced by rigid contact of the nut and the mounting seat, so that the measuring result is not accurate.

In this embodiment, the end towards the conveying pipeline in the mount pad 1 is equipped with the indent district with follow-up portion 31 shape adaptation, and follow-up portion 31 inlays and locates in the indent district, is equipped with the sealing member between the lateral wall of indent district and follow-up portion 31 simultaneously for the space between sealed follow-up portion 31 and the mount pad 1 guarantees that foil gage 2 can not receive the erosion of concrete.

In this embodiment, the mounting base 1 is provided with a through wire passing hole 12, and the connection wire 21 of the strain gauge 2 passes through the mounting base 1 through the wire passing hole 12 and is connected to processing equipment such as a signal processing unit, so as to obtain an accurate concrete conveying state.

In this embodiment, the monitoring units are provided with a plurality of, and a plurality of monitoring units are arranged along the pipeline axial, can obtain the on-way pressure drop that this delivery stroke produced according to the strain signal difference that each monitoring unit produced to judge the transportability of medium or whether medium density is reasonable. The method can be used as a monitoring method for preventing the fluid blockage of the pipeline, and the specific position of the blocked pipe can be quickly judged according to the data. For example on concrete conveying pipeline, be equipped with four monitoring unit No. one to No. four along concrete conveying direction, the difference of numerical value between four monitoring unit accords with the on-the-way pressure drop of concrete feeding under normal conditions, and when taking place to block up the situation between No. two and No. three, block up the one in the place ahead, No. two monitoring unit's pressure can rise, block up No. three at rear, No. four monitoring unit's pressure can descend, the difference between No. two and No. three is greater than the numerical range of on-the-way pressure drop far away, therefore this kind of mode of arranging is favorable to the staff quick and accurate finding concrete jam emergence point, accomplish timely mediation, avoid the whole pipe jam consequence that causes because of time delays.

The method for monitoring by using the monitoring device for the concrete conveying state has the advantages, when the blockage situation occurs, the alarm can be given in time, the position of the blockage can be output and sent, and workers can handle the blockage situation in time to avoid concrete solidification. Which comprises the following steps:

s1: the method comprises the following steps that a plurality of monitoring units are arranged along the axial direction of a concrete conveying pipeline to be monitored, and each monitoring unit sends acquired monitoring information containing a pressure value to a monitoring system;

s2: the monitoring system receives the monitoring information acquired by each monitoring unit, and when the difference of the pressure values in the monitoring information of two adjacent monitoring units is larger than a safety set value, the monitoring system outputs alarm information and position information of the two monitoring units.

The monitoring system may be a terminal including a display screen and an acousto-optic alarm device, and may directly display the position of the monitoring unit through the display screen, or may send position information to a handheld mobile terminal of a worker, which is not described herein again.

Example 2:

this embodiment is substantially the same as embodiment 1, except that in this embodiment, as shown in fig. 2, a convex portion 311 is provided on the side of the following portion 31 facing the inside of the conveying pipe, and the convex portion 311 can increase the degree of deformation of the following portion 31 when a force is applied, thereby increasing the degree of change of the strain gauge 2. At least one strain gauge 2 is arranged on each of two sides of the boss 311 in the axial direction of the pipe. The arrangement mode makes full use of the resistance characteristic of the high-viscosity high-density fluid to enable the monitoring unit to generate differential pressure in the conveying direction, force generated by the differential pressure acts on the strain gauges 2, so that differential pressure signals are generated by the strain gauges 2 on two sides, and the differential pressure signals are compared with the previously experienced differential pressure signals, so that the conveying state of the fluid in the pipeline is judged. In this embodiment, the connecting rod 32 is made of a material with good toughness, which is beneficial to generating recoverable elastic deformation when stressed, so that the follow-up portion 31 can generate pressure difference on the strain gauges 2 at two sides along with the flow of concrete more easily.

The stress principle is shown in fig. 4, when concrete flows through the monitoring unit, the external expansion force generates a force F1 on the strain gauge 2 positioned on the front side of the concrete flow, and the strain gauge 2 obtains a strain signal P1; force F2 is generated on the strain gauge 2 positioned on the rear side of concrete flowing, meanwhile, fluid flows to impact one side of the follow-up part 31, axial equivalent pressure F3 is generated, F3 enables the connecting rod 32 to generate micro deformation, so that the stress on the strain gauge 2 positioned on the rear side of the concrete flowing is increased, a strain signal P2 is obtained, and the state data of the conveyed concrete can be obtained by comprehensively analyzing the pressure difference of the strain signals P2 and P1.

And (3) judging flow speed and flow direction signals by using the data: under the condition of fluid with specified mixture ratio density, the larger the flow speed is, the larger the axial equivalent pressure F3 is, the larger the difference between P2 and P1 is, and the difference signal is compared and matched with the empirical parameter value prestored in the system, so as to obtain the current flow speed and flow direction of the fluid.

And (3) judging a flow signal by using the data: according to the obtained flow speed signal, inputting the cross section parameter of the conveying pipeline, and calculating the flow information flowing through the cross section.

And (3) judging the pressure signal by using the data: in addition to the axial equivalent pressure F3, the fluid generates a radial pressure F on the radial projection area of the follow-up part 31 during the flowing process, the conversion signal P of the pressure F is equal to 1/2 of the sum of the strain signals P1 and P2, the conversion signal P is compared and matched with the empirical parameter value prestored in the system, so that the pressure value of the fluid acting on the inner wall of the pipeline at the current device setting position is obtained, and when the value is greater than the threshold value set by the system, the occurrence of a pipe blockage accident is indicated and the alarm processing is carried out.

Using the data to make a medium transportability determination: on the premise of setting equal flow, the flow speed change is not large when the flow passes through the position of the device, but due to different medium densities, the axial equivalent pressure F3 is different, the greater the density is, the greater the F3 is, the greater the difference signal of the pressure change signals P2 and P1 is, and when the difference signal is greater than the threshold value set by the system, the system gives an alarm and reminds a user of taking measures for preventing pipe blockage.

In the present embodiment, as shown in fig. 3, the strain gauge 2 is provided in plurality, and the plurality of strain gauges 2 are evenly arranged around the axial direction of the connecting rod 32. The arrangement mode effectively avoids the situations of inaccurate data and the like caused by the irregular vibration of the follow-up part 31 around the connecting rod 32, and further improves the data accuracy of the monitoring unit.

In this embodiment, the edge of the follow-up portion 31 is provided with the flange 312 protruding to one side of the mounting seat 1, a groove matched with the shape of the flange 312 is arranged in the mounting seat 1 towards the end portion in the conveying pipeline, the flange 312 is embedded in the groove to form a labyrinth sealing joint, and meanwhile, a sealing member is arranged between the groove and the side wall of the follow-up portion 31 and used for sealing the space between the follow-up portion 31 and the mounting seat 1, so as to ensure that the strain gauge 2 cannot be corroded by concrete.

Example 3:

this embodiment is substantially the same as embodiment 2 except that in this embodiment the force transfer assembly 3 is not connected to the mounting 1 by a connecting rod 32 as shown in figure 5. But include installation section of thick bamboo 35, the tip department that the mount pad 1 faced in the pipeline is equipped with the internal thread, connects one promptly, is equipped with the external screw thread that cooperates with it on the installation section of thick bamboo 35, connects two promptly. The bottom surface of the installation cylinder 35 is the follow-up portion 31 which protrudes outwards, the follow-up portion 31 is provided with flexible deformation sheets on two sides of the protruding portion 311, the strain gauge 2 is attached to the inner side of the flexible deformation sheets, and deformation signals are extracted by directly utilizing deformation of the flexible deformation sheets. In this embodiment, the first connecting portion and the second connecting portion may be formed by other known means such as snap-fit connection, which can connect the two members to each other.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-described embodiments. It should be apparent to those skilled in the art that modifications and variations can be made without departing from the technical spirit of the present invention.