A monitoring device and method for concrete delivery status

Abstract

The present invention discloses a monitoring device and method for the state of concrete delivery. The monitoring device includes at least one monitoring unit, and the monitoring unit includes a mounting seat, a strain gauge and a force transmission component. The mounting seat is installed in a mounting hole opened on a concrete delivery pipeline to be monitored. The force transmission component is connected to the mounting seat and forms a mounting cavity with the mounting seat. The force transmission component includes a follower portion that is blocked at one side of the mounting cavity and contacts the concrete to be monitored. The strain gauge is arranged in the mounting cavity or on a side surface of the follower portion facing the mounting cavity. The monitoring device for the state of concrete delivery of the present invention has the advantages of simple structure, economical and practical, and accurate and reliable measurement results. The monitoring method using the monitoring device also has the above advantages.

Description

Technical Field

[0001] The present invention relates to the technical field of material monitoring equipment, and in particular to a monitoring device and method for concrete conveying status. Background Art

[0002] During the concrete delivery process, due to the friction resistance of the pipeline, especially when passing through some curved pumping pipelines, the delivery pressure of the concrete will gradually decrease; at the same time, the choice of concrete mix ratio also has a great influence on the delivery state of the concrete. The low water content of the concrete will lead to high viscosity, which will greatly increase the friction resistance along the way and the risk of pipe blockage, which will waste a lot of manpower and time to deal with and delay the construction progress. Therefore, measuring the pressure loss, flow velocity, pressure and other parameters along the concrete flow process is particularly important for the study of concrete pumpability. The timely prevention and alarm of pipe blockage also brings intuitive economic benefits to the construction.

[0003] The external expansion pressure generated by concrete during the pumping process can cause slight deformation of the delivery pipeline. Based on this principle, the existing monitoring means will directly stick strain gauges in the original delivery pipe wall for measurement. However, in this method, the strain gauge is in direct contact with the concrete. If other corrosive media are added to the concrete, the life of the strain gauge will be greatly reduced; the strain gauge generally does not have strong wear resistance, and the friction with the concrete will also damage the test device, which is not practical; and because the wall of the delivery pipeline is not of equal thickness and the deformation error is large, there is vibration during the pumping process, making the measurement data inaccurate, and only the delivery pressure and pipeline loss can be roughly tested, and the flow rate, flow rate and accurate pipeline loss cannot be tested. There are also schemes to judge the pumpability of concrete by measuring the slump and expansion of concrete, but this scheme does not form a quantitative parameter based on experience, and this measurement result will have a large error. In addition, there is also a manual method to determine the transportation status. This method relies too much on manual experience and cannot effectively monitor the concrete transportation status. The risk of pipe blockage is uncontrollable and cannot be handled in time, which makes the response time after pipe blockage extremely long and may cause the entire pipe to solidify and become blocked due to time delay. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a monitoring device for the concrete conveying state which is simple in structure, economical and practical and has accurate and reliable measurement results, as well as a method for monitoring using the monitoring device.

[0005] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0006] A monitoring device for concrete conveying status includes at least one monitoring unit, wherein the monitoring unit includes a mounting seat, a strain gauge and a force transmission component, wherein the mounting seat is installed in a mounting hole opened on a concrete conveying pipeline to be monitored, the force transmission component is connected to the mounting seat and forms a mounting cavity with the mounting seat, the force transmission component includes a follower portion which is blocked at one side of the mounting cavity and contacts with the concrete to be monitored, and the strain gauge is arranged in the mounting cavity or on a side surface of the follower portion facing the mounting cavity.

[0007] As a further improvement of the above technical solution:

[0008] A convex portion is provided on the side of the follower portion facing the inside of the conveying pipeline.

[0009] The force transmission assembly also includes a connecting rod, a nut and an elastic member. One end of the connecting rod is connected to the follower, the rod body passes through a through hole set on the mounting seat and is gap-matched therewith, the end that passes through the mounting seat is threadedly matched with the nut, and the elastic member is supported between the nut and the mounting seat.

[0010] There are a plurality of strain gauges, and the plurality of strain gauges are evenly arranged around the axial direction of the connecting rod.

[0011] An inner concave area matching the shape of the follower part is arranged at the end of the mounting seat facing the inside of the conveying pipe, and the follower part is embedded in the inner concave area.

[0012] The edge of the follower is provided with a rib protruding toward one side of the mounting seat, and the end of the mounting seat facing the conveying pipe is provided with a groove matching the shape of the rib, and the rib is embedded in the groove.

[0013] The force transmission component also includes a mounting tube, a connecting part is provided at the end of the mounting seat facing the conveying pipeline, a connecting part is provided on the mounting tube for cooperating with the connecting part, the bottom surface of the mounting tube is a follower part protruding outward, and the follower part is provided with flexible deformation sheets on both sides of the protruding part, and the strain sheet is attached to the inner side of the flexible deformation sheet.

[0014] The mounting seat is provided with a through wire hole, and the wire connection of the strain gauge passes through the wire hole and out of the mounting seat.

[0015] There are multiple monitoring units, and the multiple monitoring units are arranged axially along the conveying pipeline.

[0016] A method for monitoring the concrete delivery status using the above-mentioned monitoring device comprises the following steps:

[0017] S1: multiple monitoring units are arranged along the axial direction of the concrete conveying pipeline to be monitored, and each monitoring unit sends the acquired monitoring information including the pressure value to a monitoring system;

[0018] S2: The monitoring system receives the monitoring information obtained by each monitoring unit. When the difference between the pressure values ​​in the monitoring information of two adjacent monitoring units is greater than the safety set value, the monitoring system outputs an alarm message and the location information of the two monitoring units.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] The monitoring device for the concrete conveying state of the present invention comprises at least one monitoring unit, the monitoring unit comprises a mounting seat, a strain gauge and a force transmission component, the mounting seat is mounted in a mounting hole opened on the concrete conveying pipeline to be monitored, the force transmission component is connected to the mounting seat and encloses a mounting cavity with the mounting seat, the force transmission component comprises a follower portion which is blocked at one side of the mounting cavity and contacts the concrete to be monitored, and the strain gauge is arranged in the mounting cavity or on a side surface of the follower portion facing the mounting cavity. When the concrete generates an external expansion force during the pipeline conveying process, the follower portion will be touched, and the follower portion will generate a certain activity due to the movable connection setting, thereby transmitting the force to the strain gauge, causing the characteristic value to change, and the conveying state of the concrete in the conveying pipeline is obtained according to the change in the value. This setting method uses the follower portion to isolate the direct contact between the strain gauge and the concrete, thereby avoiding the wear of the strain gauge, extending the service life of the strain gauge while ensuring the measurement accuracy of the strain gauge, and effectively solving the problem of flow state monitoring during concrete pumping.

[0021] The method of monitoring using a monitoring device for the concrete delivery status of the present invention also has the above advantages, and when a blockage occurs, not only can an alarm be given in time, but the location of the blockage can also be output and sent, so that the staff can handle it in time to avoid concrete solidification. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of a monitoring device for concrete delivery status in Example 1;

[0023] Figure 2 is a schematic structural diagram of a monitoring device for concrete delivery status in Example 2;

[0024] Figure 3 is a schematic diagram of the arrangement position of strain gauges in the monitoring device for the concrete delivery state in Example 2;

[0025] Figure 4 is a schematic diagram of the force principle of the follower in the monitoring device for the concrete delivery state in Example 2;

[0026] Figure 5 Schematic diagram of the structure of the monitoring device for the concrete delivery status in Example 3.

[0027] Legend: 1. Mounting seat; 11. Through hole; 12. Wire hole; 2. Strain gauge; 21. Wiring; 3. Force transmission component; 31. Follower; 311. Raised portion; 312. Rib; 32. Connecting rod; 33. Nut; 34. Elastic member; 35. Mounting tube. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and meticulously below in conjunction with the accompanying drawings and preferred embodiments of the present invention, but the protection scope of the present invention is not limited to the following specific embodiments.

[0029] Embodiment 1:

[0030] like Figure 1 As shown, the monitoring device for the concrete conveying state of this embodiment includes at least one monitoring unit, which includes a mounting seat 1, a strain gauge 2 and a force transmission component 3. The mounting seat 1 is installed in a mounting hole opened on the concrete conveying pipeline to be monitored. The force transmission component 3 is connected to the mounting seat 1 and encloses a mounting cavity with the mounting seat 1. The force transmission component 3 includes a follower 31 that is blocked at one side of the mounting cavity and contacts the concrete to be monitored. The strain gauge 2 is arranged in the mounting cavity or on the follower 31. When the concrete generates an external expansion force during the pipeline transportation process, the follower 31 will be touched. Due to the movable connection setting, the follower 31 will generate a certain activity due to the touch, thereby transmitting the force to the strain gauge 2, so that the characteristic value changes, and the conveying state of the concrete in the conveying pipeline is obtained according to the change in the value. This setting method uses the follower 31 to isolate the direct contact between the strain gauge 2 and the concrete, thereby avoiding the wear of the strain gauge 2, extending the service life of the strain gauge while ensuring the measurement accuracy of the strain gauge 2, and effectively solving the problem of flow state monitoring during concrete pumping. The follower 31 is made of wear-resistant material, which effectively reduces the damage caused by contact with concrete and increases the service life of the entire device.

[0031] In this embodiment, a plurality of strain gauges 2 are provided, and the numerical changes obtained by the plurality of strain gauges 2 can verify each other, which not only improves the accuracy of the measurement result, but also when a certain strain gauge 2 fails, the faulty value can be quickly eliminated based on the numerical comparison between the plurality of strain gauges 2.

[0032] In this embodiment, the force transmission component 3 also includes a connecting rod 32, a nut 33 and an elastic member 34. One end of the connecting rod 32 is connected to the follower 31, and the rod body passes through the through hole 11 set on the mounting seat 1 and is loosely matched therewith, so that the connecting rod 32 has a certain amount of activity space, but the radial activity is very small. The end that passes through the mounting seat 1 is threadedly matched with the nut 33, and an elastic member 34 is supported between the nut 33 and the mounting seat 1. The elastic member 34 ensures that there is a certain amount of activity margin between the follower 31 and the mounting seat 1 to play a role in force transmission; the threaded match between the nut 33 and the connecting rod 32 can quickly adjust the preload force of the elastic member 34, so that the monitoring unit as a whole can be suitable for different monitoring environments and monitoring situations.

[0033] In this embodiment, a countersunk head is provided at the through hole 11 of the mounting seat 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 washer is provided between the nut 33 and the mounting seat 1 to prevent the rigid contact between the two from affecting the follower 31 and causing inaccurate measurement results.

[0034] In this embodiment, an inner concave area matching the shape of the follower part 31 is provided at the end of the mounting seat 1 facing the conveying pipe, and the follower part 31 is embedded in the inner concave area. At the same time, a sealing member is provided between the inner concave area and the side wall of the follower part 31, which is used to seal the space between the follower part 31 and the mounting seat 1 to ensure that the strain gauge 2 will not be corroded by the concrete.

[0035] In this embodiment, a through wire hole 12 is provided on the mounting base 1, and the wire 21 of the strain gauge 2 passes through the mounting base 1 through the wire hole 12 and is connected to a processing device such as a signal processing unit to obtain an accurate concrete delivery status.

[0036] In this embodiment, there are multiple monitoring units, and the multiple monitoring units are arranged along the axial direction of the conveying pipeline. The pressure drop along the conveying stroke can be obtained according to the difference of the strain signals generated by each monitoring unit, so as to determine whether the medium can be conveyed or whether the medium density is reasonable. This can be used as a monitoring method to prevent pipeline fluid blockage, and the specific location of the blockage can be quickly determined based on the data. For example, on a concrete conveying pipeline, four monitoring units from No. 1 to No. 4 are provided along the direction of concrete conveying. Under normal circumstances, the difference in values ​​between the four monitoring units conforms to the pressure drop along the concrete conveying. When a blockage occurs between No. 2 and No. 3, the pressure of the No. 1 and No. 2 monitoring units in front of the blockage will rise, and the pressure of the No. 3 and No. 4 monitoring units behind the blockage will drop. The difference between No. 2 and No. 3 is much larger than the numerical range of the pressure drop along the conveying stroke. Therefore, this arrangement method is conducive to the staff to quickly and accurately find the point where the concrete blockage occurs, so as to clear it in time and avoid the consequences of the whole pipe blockage caused by time delay.

[0037] The method of monitoring using the above concrete delivery status monitoring device in this embodiment also has the above advantages, and when a blockage occurs, not only can an alarm be given in time, but also the location of the blockage can be output, so that the staff can handle it in time to avoid concrete solidification. It includes the following steps:

[0038] S1: multiple monitoring units are arranged along the axial direction of the concrete conveying pipeline to be monitored, and each monitoring unit sends the acquired monitoring information including the pressure value to a monitoring system;

[0039] S2: The monitoring system receives the monitoring information obtained by each monitoring unit. When the difference between the pressure values ​​in the monitoring information of two adjacent monitoring units is greater than the safety set value, the monitoring system outputs an alarm message and the position information of the two monitoring units.

[0040] The monitoring system may be a terminal including a display screen and an audible and visual alarm device, which may directly display the location of the monitoring unit through the display screen, or send the location information to a handheld mobile terminal of the staff, which will not be elaborated here.

[0041] Embodiment 2:

[0042] This embodiment is basically the same as Embodiment 1, except that, in this embodiment, Figure 2 As shown, a protrusion 311 is provided on the side of the follower 31 facing the inside of the conveying pipeline. The protrusion 311 can increase the deformation degree of the follower 31 when subjected to force, thereby increasing the degree of change of the strain gauge 2. At least one strain gauge 2 is provided on each side of the protrusion 311 along the axial direction of the pipeline. This arrangement makes full use of the resistance characteristics of high-viscosity and high-density fluids to enable the monitoring unit to generate a pressure difference in the conveying direction. The force generated by the pressure difference will act on the strain gauge 2, so that the strain gauges 2 on both sides generate a pressure difference signal, and the pressure difference signal is compared with the pre-experienced pressure difference signal to determine the conveying state of the fluid in the pipeline. In this embodiment, the connecting rod 32 is made of a material with good toughness, which is conducive to the generation of recoverable elastic deformation when subjected to force, so that the follower 31 is more likely to generate a pressure difference on the strain gauges 2 on both sides with the flow of concrete.

[0043] Its force principle is as follows Figure 4 As shown, when concrete flows through the monitoring unit, its outward expansion force generates a force F1 on the strain gauge 2 located on the front side of the concrete flow, and the strain gauge 2 obtains a strain signal P1; a force F2 is generated on the strain gauge 2 located on the rear side of the concrete flow, and at the same time, the fluid flow hits one side of the follower 31, generating an axial equivalent pressure F3, F3 will cause a slight deformation of the connecting rod 32, thereby increasing the force on the strain gauge 2 located on the rear side of the concrete flow, and obtaining a strain signal P2. By comprehensively analyzing the pressure difference of the strain signals P2 and P1, the state data of the conveyed concrete can be obtained.

[0044] The data is used to determine the flow velocity and flow direction signals: under the condition of fluid with specified ratio density, the greater the flow velocity, the greater the axial equivalent pressure F3, and the greater the difference between P2 and P1. The difference signal is compared and matched with the empirical parameter values ​​pre-stored in the system to obtain the current flow velocity and flow direction of the fluid.

[0045] Use this data to determine the flow signal: Based on the obtained flow velocity signal, input the cross-sectional parameters of the delivery pipeline, and then the flow information flowing through the cross-sectional area can be calculated.

[0046] The data is used to determine the pressure signal: in addition to the axial equivalent pressure F3, the fluid will also generate a radial pressure F on the radial projection area of ​​the follower 31 during the flow 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 values ​​pre-stored in the system to obtain the pressure value of the fluid at the current device setting position acting on the inner wall of the pipeline. When the value is greater than the threshold set by the system, it indicates that a pipe blockage accident has occurred and an alarm is issued.

[0047] Use this data to determine the transportability of the medium: Under the premise of setting the same flow rate, the flow velocity when flowing through the device position does not change much, but due to the different medium density, the axial equivalent pressure F3 will be different. The greater the density, the greater the F3 will be, and the greater the difference signal between the pressure change signals P2 and P1 will be. When it is greater than the threshold set by the system, the system will alarm and remind the user to take measures to prevent pipe blockage.

[0048] In this embodiment, Figure 3 As shown, a plurality of strain gauges 2 are provided, and the plurality of strain gauges 2 are evenly arranged around the axial direction of the connecting rod 32. This arrangement effectively avoids the situation where the follower 31 makes irregular vibrations around the connecting rod 32, causing inaccurate data, and further improves the data accuracy of the monitoring unit.

[0049] In this embodiment, the edge of the follower part 31 is provided with a rib 312 protruding toward one side of the mounting seat 1, and the end of the mounting seat 1 facing the conveying pipe is provided with a groove adapted to the shape of the rib 312. The rib 312 is embedded in the groove to form a labyrinth sealing joint. At the same time, a sealing member is provided between the groove and the side wall of the follower part 31 to seal the space between the follower part 31 and the mounting seat 1 to ensure that the strain gauge 2 will not be corroded by the concrete.

[0050] Embodiment 3:

[0051] This embodiment is basically the same as Embodiment 2, except that, in this embodiment, Figure 5As shown, the force transmission component 3 is not connected to the mounting base 1 through a connecting rod 32. Instead, it includes a mounting cylinder 35. The mounting base 1 is provided with an internal thread at the end facing the inside of the conveying pipe, i.e., the connecting part 1, and the mounting cylinder 35 is provided with an external thread matching therewith, i.e., the connecting part 2. The bottom surface of the mounting cylinder 35 is a follower part 31 protruding outward, and the follower part 31 is provided with flexible deformation sheets on both sides of the protruding part 311. The strain gauge 2 is attached to the inner side of the flexible deformation sheet, and the deformation of the flexible deformation sheet itself is directly used to extract the deformation signal. In this embodiment, the connecting part 1 and the connecting part 2 can also be implemented by other well-known methods such as snap-fit ​​connection that can connect two objects to each other.

[0052] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. For those skilled in the art, improvements and changes obtained without departing from the technical concept of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A monitoring device for concrete delivery status, comprising at least one monitoring unit, characterized in that: The monitoring unit comprises a mounting seat (1), a strain gauge (2) and a force transmission component (3); the mounting seat (1) is mounted in a mounting hole provided on a concrete delivery pipeline to be monitored; the force transmission component (3) is connected to the mounting seat (1) and forms a mounting cavity with the mounting seat (1); the force transmission component (3) comprises a follower portion (31) disposed at one side of the mounting cavity and in contact with the concrete to be monitored; the strain gauge (2) is disposed in the mounting cavity or on a side surface of the follower portion (31) facing the mounting cavity; The force transmission assembly (3) further comprises a connecting rod (32), a nut (33) and an elastic member (34); one end of the connecting rod (32) is connected to the follower (31); the rod body passes through a through hole (11) provided on the mounting seat (1) and is clearance-matched therewith; the end portion passing through the mounting seat (1) is threadably matched with the nut (33); and the elastic member (34) is supported between the nut (33) and the mounting seat (1); A countersunk head is provided at the through hole (11) of the mounting seat (1) to accommodate the elastic member (34).

2. The monitoring device for concrete delivery status according to claim 1 is characterized in that: A protrusion (311) is provided on the side of the follower portion (31) facing the inside of the conveying pipe.

3. The monitoring device for concrete delivery status according to claim 2 is characterized in that: A plurality of the strain gauges (2) are provided, and the plurality of strain gauges (2) are evenly arranged around the axial direction of the connecting rod (32).

4. The monitoring device for concrete delivery status according to claim 3 is characterized in that: An end portion of the mounting seat (1) facing the inside of the delivery pipe is provided with a concave area that matches the shape of the follower portion (31), and the follower portion (31) is embedded in the concave area.

5. The monitoring device for concrete delivery status according to claim 3 is characterized in that: The edge of the follower (31) is provided with a rib (312) protruding toward one side of the mounting seat (1), and the end of the mounting seat (1) facing the inside of the conveying pipe is provided with a groove matching the shape of the rib (312), and the rib (312) is embedded in the groove.

6. The monitoring device for concrete delivery status according to claim 2, characterized in that: The force transmission component (3) further comprises a mounting cylinder (35); a first connection portion is provided at the end of the mounting seat (1) facing the inside of the conveying pipeline; a second connection portion is provided on the mounting cylinder (35) and is cooperatively connected to the first connection portion; the bottom surface of the mounting cylinder (35) is a follower portion (31) protruding outwards; the follower portion (31) is provided with flexible deformation sheets on both sides of the protruding portion (311); and the strain gauge (2) is attached to the inner side of the flexible deformation sheet.

7. The monitoring device for concrete delivery status according to claim 1, characterized in that: The mounting seat (1) is provided with a through-going wire hole (12), and the wire connection (21) of the strain gauge (2) passes through the wire hole (12) and out of the mounting seat (1).

8. The monitoring device for concrete delivery status according to claim 1, characterized in that: There are multiple monitoring units, and the multiple monitoring units are arranged axially along the conveying pipeline.

9. A method for monitoring using the monitoring device for concrete delivery status according to claim 8, characterized in that: The following steps are involved: S1: multiple monitoring units are arranged along the axial direction of the concrete conveying pipeline to be monitored, and each monitoring unit sends the acquired monitoring information including the pressure value to a monitoring system; S2: The monitoring system receives the monitoring information obtained by each monitoring unit. When the difference between the pressure values ​​in the monitoring information of two adjacent monitoring units is greater than the safety set value, the monitoring system outputs an alarm message and the position information of the two monitoring units.

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