Expansion force testing mechanism

Abstract

The present invention discloses an expansion force testing mechanism, including a bracket and a reaction frame, wherein the bracket is provided with a table plate, a reaction barrel with an opening at the top is fixedly provided on the table plate, a grouting port is provided at the bottom end of the reaction barrel, a valve is provided on the grouting port, a piston is provided in the reaction barrel and moves along the axial direction of the reaction barrel, a first connecting rod is provided on the piston, a force value measuring element and a displacement measuring element are provided on the first connecting rod, the top end of the first connecting rod extends to the reaction frame and is connected to the reaction frame, the lower part of the reaction frame moves through the table plate, and a load adding device is provided at the lower part of the reaction frame. The expansion force of the expansion object under different loads can be measured with high measurement accuracy. The present invention is applied to the field of geotechnical engineering technology.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical engineering, and in particular to an expansion force testing mechanism. Background Art

[0002] In recent years, with the continuous development of civil engineering and water conservancy projects in my country, a batch of new civil engineering materials suitable for different "water-soil" engineering diseases have emerged. Among them, foaming polymer grouting materials have been widely used in engineering rescue and repair reinforcement caused by "water-soil" diseases due to their characteristics of no water reaction, early strength, large expansion force and strong durability. Among the many "water-soil" diseases, the sinking of road surfaces, airport pavements, underground pipelines, channel plates and high-speed rail track plates is the most common. The traditional method is to perform polymer conduit grouting to lift the diseased location, but the expansion force parameters of the polymer must be obtained in advance. However, the existing measurement method is to grout in a closed container and measure the polymer expansion force by installing an earth pressure box inside the upper cover of the reaction container. This ignores the constraint of the upper load, which does not conform to the actual engineering situation, and the accuracy of the existing earth pressure box and the accuracy of the measurement results need to be considered. Therefore, there is an urgent need for a device that can accurately measure the expansion force of polymers under fixed constraints.

[0003] The patent document with authorization number CN205748755U discloses a multi-channel rock and soil expansion force automated testing system, including a group of expansion force testers with the same structure electrically connected to a central control system, the expansion force testers including an anti-deformation frame consisting of a base, a top plate and two columns connecting the two, an S-shaped force sensor is arranged under the top plate, a screw lifting device is arranged on the base, a tray is arranged at the end of the top rod of the screw lifting device, and a sample container is clamped between the S-shaped force sensor and the tray; the signal output end of the S-shaped force sensor is electrically connected to the input end of the analog-to-digital converter, the output end of the analog-to-digital converter is electrically connected to the signal input end of the PLC controller, and the signal output end of the PLC controller is electrically connected to the signal input end of the central control system.

[0004] The solution in the above patent document does not provide any technical inspiration on how to measure expansion force under different loads, and the measurement accuracy is not high. Summary of the invention

[0005] The main purpose of the present invention is to provide an expansion force testing mechanism, which can measure the expansion force of an expansion object under different loads with high measurement accuracy.

[0006] To achieve the above-mentioned purpose, the present invention proposes an expansion force testing mechanism, including a bracket and a reaction frame, the bracket is provided with a table plate, a reaction barrel with an open top is fixedly provided on the table plate, a grouting port is provided at the bottom end of the reaction barrel, a valve is provided on the grouting port, a piston is provided in the reaction barrel and moves along the axial direction of the reaction barrel, a first connecting rod is provided on the piston, a force measuring element and a displacement measuring element are provided on the first connecting rod, the top end of the first connecting rod extends to the reaction frame and is connected to the reaction frame, the lower part of the reaction frame moves through the table plate, and a load adding device is provided at the lower part of the reaction frame.

[0007] Preferably, the expansion material tested in the present invention is a polymer; the bracket can be a plurality of supporting legs arranged at the bottom end of the table, and the bracket and the table form the structure of a working platform.

[0008] Further improved, the force value measuring element is a force ring, the displacement measuring element includes an electronic micrometer and a data acquisition instrument, the force ring is embedded in the first connecting rod, the electronic micrometer is arranged in the force ring, and the electronic micrometer and the data acquisition instrument are electrically connected. The first connecting rod is divided into two sections, one of which is connected to the top of the force ring, and the other is connected to the bottom of the force ring. The force ring and the electronic micrometer can accurately test the force value and displacement. The data acquisition instrument is used to read the reading of the electronic micrometer. The electronic micrometer and the data acquisition instrument are connected by a data line, and the electronic micrometer transmits the data to the data display instrument through the data line. After the data acquisition instrument readings stabilize, the expansion force change curve during the reaction process (expansion force = (change in electronic micrometer reading × force ring coefficient × 10) / average force area of ​​the stone body at the contact point between the polymer stone body and the piston) and the vertical displacement curve (displacement = change in micrometer reading) can be obtained. By changing the number of grouting guns and the load and repeating the above steps, the relationship between the expansion force and the fixed constraint force and the polymer density can be obtained.

[0009] As a further improvement, the piston is provided with an exhaust hole, and the interior of the reaction barrel is connected to the outside through the exhaust hole. The exhaust hole is used to exhaust the gas generated during the polymer reaction. Only after the gas generated during the polymer reaction is exhausted can the expansion force of the polymer be measured more accurately.

[0010] As a further improvement, the inner wall of the reaction barrel is provided with a step, and in the reaction barrel, the inner diameter of the upper part of the step is larger than the inner diameter of the lower part of the step, and the piston is movably arranged on the upper part of the step. Since a certain space is required for the polymer reaction, the step can block the piston, and when the polymer reacts, the piston is prevented from falling to the bottom of the reaction barrel, so that the polymer can react fully.

[0011] As a further improvement, the inner wall of the reaction barrel is coated with lubricating oil, which enables the piston to slide smoothly on the inner wall of the reaction barrel.

[0012] As a further improvement, a sealing ring is sleeved on the piston, and the sealing ring can seal between the piston and the reaction barrel to ensure good airtightness.

[0013] As a further improvement, the top edge of the reaction barrel is bent outward, and the top edge of the reaction barrel is connected to the table plate by a first bolt, so that the reaction barrel is easy to disassemble and assemble, and is convenient for cleaning and maintenance.

[0014] Further improved, the reaction frame includes multiple upper beams and multiple lower beams, the ends of each upper beam are connected in sequence to form a first frame structure, and the ends of each lower beam are connected in sequence to form a second frame structure, the upper beams and the lower beams are connected by a second bolt, the upper beam is located above the table, the second bolt is movably inserted on the table, the lower beam is located below the table, the top end of the first connecting rod extends to the upper beam and is connected to the upper beam, and the load adding device is arranged on the lower beam. The vertical positions of the upper beam and the lower beam can be adjusted by the second bolt. During testing, the height of the upper beam and the lower beam can be adjusted according to the specific situation, and it can adapt to a variety of reaction conditions.

[0015] Further improved, the load adding device includes a second connecting rod and a lever beam, the second connecting rod is connected to the table, the first end of the lever beam is rotatably hung on the second connecting rod, the second end of the lever beam is provided with a weight plate, and the middle part of the lever beam is also movably hung on the bottom end of the reaction frame. Specifically, a hanging ring is provided in the middle part of the lever beam, and a hook is provided on the bottom end of the reaction frame, that is, the lower beam. The middle part of the lever beam is movably hung on the hook through the hanging ring. When the hanging ring is hung on the hook, the load added to the weight plate can be transferred to the piston through the lower beam-second bolt-upper beam-first connecting rod. Of course, the hook can also be set on the lever beam, and correspondingly, the hanging ring is set on the lower beam.

[0016] As a further improvement, a fine-tuning weight is further provided at the first end of the lever beam, the connection point between the lever beam and the second connecting rod is located between the fine-tuning weight and the weight plate, and the fine-tuning weight is slidably arranged along the length direction of the lever beam. The fine-tuning weight is used for fine-tuning, making the addition and adjustment of the load more accurate and convenient.

[0017] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0018] When measuring the expansion force of the expansion object, the present invention first opens the valve, injects the expansion object into the reaction barrel from the grouting port, and closes the valve after the injection. The expansion object is slowly expanded, and a load is added to the load adding device. The load added to the load adding device is transmitted to the first connecting rod through the reaction frame, and the first connecting rod is transmitted to the piston; the force acting on the first connecting rod during the expansion process of the expansion object is measured by the force value measuring element, and the displacement measuring element can detect the displacement of the piston during the expansion process of the expansion object. By adding different loads to the load adding device and repeating the above steps, the expansion force of the expansion object under different loads can be tested, and the expansion force = displacement * force value / piston area.

[0019] The present invention acts on the reaction frame through a load adding device, and the reaction frame acts on the piston in reverse through a first connecting rod, thereby realizing the testing of the expansion force of the expansion object under the action of fixed constraints; the expansion force is measured by a force value measuring element, and the displacement is measured by a displacement measuring element, so the size of the expansion force can be accurately measured, and the operation is simple, economical and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of the expansion force testing mechanism. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0026] Please refer to Figure 1 A expansion force testing mechanism includes a bracket 1 and a reaction frame 2. The bracket 1 is provided with a table plate 3. A reaction barrel 4 with an open top is fixedly provided on the table plate 3. A grouting port 41 is provided at the bottom end of the reaction barrel 4. A valve 42 is provided on the grouting port 41. A piston 5 that moves axially along the reaction barrel 4 is provided in the reaction barrel 4. A first connecting rod 51 is provided on the piston 5. A force measuring element 52 and a displacement measuring element 53 are provided on the first connecting rod 51. The top end of the first connecting rod 51 extends to the reaction frame 2 and is connected to the reaction frame 2. The lower part of the reaction frame 2 moves through the table plate 3. A load adding device 6 is provided at the lower part of the reaction frame 2.

[0027] When measuring the expansion force of the expansion object in this embodiment, first open the valve 42, inject the expansion object into the reaction barrel 4 from the grouting port 41, and close the valve 42 after injection. Wait for the expansion object to expand slowly, and add a load to the load adding device 6, the load added to the load adding device 6 is transmitted to the first connecting rod 51 through the reaction frame 2, and the first connecting rod 51 is transmitted to the piston 5; the force of the expansion object on the first connecting rod 51 during the expansion process is measured by the force value measuring element 52, and the displacement measuring element 53 can detect the displacement of the piston 5 during the expansion process of the expansion object. By adding different loads to the load adding device 6 and repeating the above steps, the expansion force of the expansion object under different loads can be tested, and the expansion force = displacement * force value / piston 5 area.

[0028] In this embodiment, the load adding device 6 acts on the reaction frame 2, and the reaction frame 2 acts in reverse on the piston 5 through the first connecting rod 51, thereby realizing the testing of the expansion force of the expansion object under the action of fixed constraint; the expansion force is measured by the force value measuring element 52, and the displacement is measured by the displacement measuring element 53, so that the size of the expansion force can be accurately measured, and the operation is simple, economical and practical.

[0029] Preferably, the expansion material tested in this embodiment is a polymer; the bracket 1 can be a plurality of supporting legs arranged at the bottom end of the table 3, and the bracket 1 and the table 3 form a structure of a working platform.

[0030] In this embodiment, as a further improvement of the above technical solution, the force value measuring element 52 is a force ring, and the displacement measuring element 53 includes an electronic micrometer 531 and a data acquisition instrument 532. The force ring is embedded in the first connecting rod 51, and the electronic micrometer 531 is arranged in the force ring. The electronic micrometer 531 and the data acquisition instrument 532 are electrically connected. The first connecting rod 51 is divided into two sections, one of which is connected to the top of the force ring, and the other is connected to the bottom of the force ring. The force ring and the electronic micrometer 531 can accurately test the force value and displacement. The data acquisition instrument 532 is used to read the reading of the electronic micrometer 531. The electronic micrometer 531 and the data acquisition instrument 532 are connected by a data line, and the electronic micrometer 531 transmits data to the data display instrument through the data line. After the reading of the data acquisition instrument 532 stabilizes, the expansion force change curve (expansion force = (change in reading of the electronic micrometer 531 × force ring coefficient × 10) / average force area of ​​the polymer stone body at the contact point between the polymer stone body and the piston 5) and the vertical displacement curve (displacement = change in micrometer reading) during the reaction process can be obtained. By changing the number of grouting guns and the load and repeating the above steps, the relationship between the expansion force and the fixed constraint force and the polymer density can be obtained.

[0031] In this embodiment, as a further improvement of the above technical solution, a vent hole 54 is provided on the piston 5, and the interior of the reaction barrel 4 is connected to the outside through the vent hole 54. The vent hole 54 is used to discharge the gas generated during the polymer reaction. Only after the gas generated during the polymer reaction is discharged, the expansion force of the polymer can be measured more accurately.

[0032] In this embodiment, as a further improvement of the above technical solution, a step 43 is provided on the inner wall of the reaction barrel 4. In the reaction barrel 4, the inner diameter of the upper part of the step 43 is greater than the inner diameter of the lower part of the step 43, and the piston 5 is movably arranged on the upper part of the step 43. Since a certain space is required for the polymer reaction, the step 43 can block the piston 5, and when the polymer reacts, the piston 5 is prevented from falling to the bottom of the reaction barrel 4, so that the polymer can react fully.

[0033] In this embodiment, as a further improvement of the above technical solution, the inner wall of the reaction barrel 4 is coated with lubricating oil, which enables the piston 5 to slide smoothly on the inner wall of the reaction barrel 4 .

[0034] In this embodiment, as a further improvement of the above technical solution, a sealing ring 55 is sleeved on the piston 5, and the sealing ring 55 can seal between the piston 5 and the reaction barrel 4 to ensure good airtightness.

[0035] In this embodiment, as a further improvement of the above technical solution, the top edge of the reaction barrel 4 is bent outward, and the top edge of the reaction barrel 4 and the table 3 are connected by a first bolt 44, so that the reaction barrel 4 is easy to disassemble and assemble, and is convenient for cleaning and maintenance.

[0036] In this embodiment, as a further improvement of the above technical solution, the reaction frame 2 includes an upper crossbeam 21 and a lower crossbeam 22, the upper crossbeam 21 and the lower crossbeam 22 are connected by a second bolt 23, the upper crossbeam 21 is located above the table 3, the second bolt 23 is movably arranged on the table 3, the lower crossbeam 22 is located below the table 3, the top end of the first connecting rod 51 extends to the upper crossbeam 21 and is connected to the upper crossbeam 21, and the load adding device 6 is arranged on the lower crossbeam 22. The vertical positions of the upper crossbeam 21 and the lower crossbeam 22 can be adjusted by the second bolt 23. During testing, the heights of the upper crossbeam 21 and the lower crossbeam 22 can be adjusted according to the specific situation, and can adapt to a variety of reaction conditions.

[0037] In this embodiment, as a further improvement of the above technical solution, the load adding device 6 includes a second connecting rod 61 and a lever beam 62, the second connecting rod 61 is connected to the table 3, the first end 621 of the lever beam 62 is rotatably hung on the second connecting rod 61, the second end 622 of the lever beam 62 is provided with a weight plate 63, and the middle part of the lever beam 62 is also movably hung on the bottom end of the reaction frame 2. Specifically, a hanging ring 64 is provided in the middle part of the lever beam 62, and a hook 221 is provided on the bottom end of the reaction frame 2, that is, the lower beam 22, and the middle part of the lever beam 62 is movably hung on the hook 221 through the hanging ring 64. When the hanging ring 64 is hung on the hook 221, the load added to the weight plate 63 can be transmitted to the piston 5 through the lower beam 22-the second bolt 23-the upper beam 21-the first connecting rod 51. Of course, the hook 221 can also be set on the lever beam 62, and correspondingly, the hanging ring 64 is set on the lower beam 22.

[0038] In this embodiment, as a further improvement of the above technical solution, the first end 621 of the lever beam 62 is further provided with a fine-tuning weight 65, the connection point between the lever beam 62 and the second connecting rod 61 is located between the fine-tuning weight 65 and the weight plate 63, the fine-tuning weight 65 is slidably arranged along the length direction of the lever beam 62, and a counterweight measuring table is also provided on the lever beam 62. The fine-tuning weight 65 is used for fine-tuning, so that the addition and adjustment of the load are more accurate and convenient.

[0039] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An expansion force testing mechanism, characterized in that: The invention comprises a bracket and a reaction frame, wherein the bracket is a plurality of supporting legs arranged at the bottom end of a table, the bracket is provided with a table, a reaction barrel with an opening at the top is fixedly provided on the table, a step is provided on the inner wall of the reaction barrel, the inner diameter of the upper part of the step in the reaction barrel is larger than the inner diameter of the lower part of the step, a grouting port is provided at the bottom end of the reaction barrel, a valve is provided on the grouting port, a piston is provided in the reaction barrel which moves along the axial direction of the reaction barrel, the piston is movably arranged at the upper part of the step, the top edge of the reaction barrel is bent outward, the top edge of the reaction barrel and the table are connected by a first bolt, an exhaust hole is provided on the piston, and the reaction The interior of the barrel is connected to the outside world through an exhaust hole. A first connecting rod is provided on the piston. A force measuring element and a displacement measuring element are provided on the first connecting rod. The top end of the first connecting rod extends to the reaction frame and is connected to the reaction frame. The lower part of the reaction frame movably passes through a table. A load adding device is provided at the lower part of the reaction frame. The load adding device includes a second connecting rod and a lever beam. The second connecting rod is connected to the table. The first end of the lever beam is rotatably hung on the second connecting rod. A weight plate is provided on the second end of the lever beam. The middle part of the lever beam is also movably hung on the bottom end of the reaction frame.

2. The expansion force testing mechanism according to claim 1, characterized in that: The force value measuring element is a force ring, and the displacement measuring element includes an electronic micrometer and a data acquisition instrument. The force ring is embedded on the first connecting rod, and the electronic micrometer is arranged in the force ring. The electronic micrometer and the data acquisition instrument are electrically connected.

3. The expansion force testing mechanism according to claim 1, characterized in that: The inner wall of the reaction barrel is coated with lubricating oil.

4. The expansion force testing mechanism according to claim 1, characterized in that: A sealing ring is sleeved on the piston.

5. The expansion force testing mechanism according to claim 1, characterized in that: The reaction frame includes an upper crossbeam and a lower crossbeam, and the upper crossbeam and the lower crossbeam are connected by a second bolt. The upper crossbeam is located above the table plate, and the second bolt is movably passed through the table plate. The lower crossbeam is located below the table plate. The top end of the first connecting rod extends to the upper crossbeam and is connected to the upper crossbeam, and the load adding device is arranged on the lower crossbeam.

6. The expansion force testing mechanism according to claim 5, characterized in that: The first end of the lever beam is also provided with a fine-tuning weight, the connection point between the lever beam and the second connecting rod is located between the fine-tuning weight and the weight plate, and the fine-tuning weight is slidably arranged along the length direction of the lever beam.

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