LU500776B1 - Bearing and sample loading mechanism for triaxial loading model for rocks - Google Patents
Bearing and sample loading mechanism for triaxial loading model for rocks Download PDFInfo
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- LU500776B1 LU500776B1 LU500776A LU500776A LU500776B1 LU 500776 B1 LU500776 B1 LU 500776B1 LU 500776 A LU500776 A LU 500776A LU 500776 A LU500776 A LU 500776A LU 500776 B1 LU500776 B1 LU 500776B1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/02—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor using a plurality of sample containers moved by a conveyor system past one or more treatment or analysis stations
- G01N35/04—Details of the conveyor system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
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Abstract
A bearing and sample loading mechanism for a triaxial loading model for rocks relates to the field of rock testing equipment. The mechanism comprises a stander, wherein a transversely arranged guide rail and a movable flat plate slidably mounted on the guide rail are mounted on the stander; a model is arranged at one end of the stander, an opening is formed in one end of the model, a sealing cover matched with an opening end of the model is arranged on the movable flat plate, and a bearing plate which is horizontally distributed and used for placing a rock test piece is connected to the sealing cover; and a driving mechanism is used for driving the movable flat plate to move frontwards along the guide rail and driving the rock test piece on the bearing plate to be conveyed into the model along the opening end of the model, and meanwhile, the opening end of the model is sealed with the sealing cover, and a bolt hole for being fixed to the model is formed in a circumferential direction of the sealing cover. According to the bearing and sample loading mechanism disclosed by the present invention, a sealing cover body is fixed to the movable flat plate, the linear motion of the movable flat plate is achieved by use of the driving mechanism, thus achieving the movement of the sealing cover body; moreover, the operation is simple and labour-saving, and the sealing cover body is stable in movement and safe in mounting and dismounting.
Description
BEARING AND SAMPLE LOADING MECHANISM FOR TRIAXIAL LOADING MODEL HUS00776
TECHNICAL FIELD The present invention relates to the field of rock testing equipment, and in particular to a bearing and sample loading mechanism for a triaxial loading model for rocks.
BACKGROUND ART Since the first successful test, hydraulic fracturing has become one of the main measures for increasing the oil and gas production in the modern petroleum industry, which plays an important role in the production of low-permeability oil and gas reservoirs. However, field operations have shown that if a fracture runs through a water layer, not only the failure of the fracturing operation but also the damage of a reservoir pressure system may be caused, and one main reason for the failure of the operation is the failure to achieve effective control of the fracture geometry. The geothermal energy contained in hot dry rocks in the earth's crust is huge and has become a new energy source for research and development in countries around the world. The field test research on the enhanced geothermal engineering for hot dry rock resource development is large in investment, long in period, and high in risk, thus it is necessary to implement hot dry rock hydraulic fracturing laboratory research before field fracturing and artificial thermal reservoir construction demonstration engineering. To this end, it is particularly valuable to establish a triaxial loading model for rocks to provide parameter and technical supports for field fracturing process design and reservoir reformation. In the process of constructing the hot dry rock artificial reservoir through the hydraulic fracturing technology, economic and effective fracturing parameters are tested, the geometry and distribution characteristics of hydraulic fractures are monitored, thus providing necessary technical support and basic scientific research data for development of construction of the hot dry rock artificial reservoir; in this way, the bearing and sample loading mechanism for the triaxial loading model for rocks is particularly important. At present, devices for researching crack initiation and extension of fractures by the 1 domestic research institutes such as Taiyuan University of Technology and China Petroleum 17500778 Exploration and Development Research Institute Langfang Branch are all large-scale true triaxial simulation experimental devices. Such device adopts an upward opening, and a rock test piece and a sealing cover are all mounted and dismounted by adopting by hoisting. Although a large-size true triaxial simulation test system can be used to simulate a fracturing fracture propagation mechanism simulation experiment under reservoir ground stress conditions, there are still deficiencies:
1. the rock is large, positioning is inaccurate, and operation is inconvenient. The rock test piece adopted for the true triaxial fracturing simulation experiment is large in volume and representative. Rocks of 300 x 300 x 300 (mm) specification, even larger, are commonly employed. The position is hard to determine when the rock test piece is hoisted into a model cavity, and the operation is inconvenient;
2. the sealing cover body is heavy, dismounting is inconvenient, and positioning is inaccurate. The weight of the sealing cover body is directly determined based on the size of the rock test piece. Taking the rock test piece of 300 x 300 x 300 (mm) specification as an example, the sealing cover body can bear the pressure of 20 MPa, the size of the sealing cover body is at least 600 x 600 x 120 (mm), the weight of the sealing cover body is 60 cm x 60 cm x 12 cm x 7.8 g/cm = 336960 g = 336.96 Kg, it is obviously labour-consuming to artificially finish mounting and dismounting of the sealing cover body with the weight of more than 300 kg in a suspended mode, even if a crane is used, the suspended sealing cover body may also swing back and forth and is not prone to being aligned with a fixing hole, and the height is not prone to being controlled. And the general laboratory also does not have the conditions to equip the crane;
3. the sealing cover body covers the model from an upper side, thus a liquid flow pipeline is difficult to be connected from the rock test piece. Moreover, the sealing cover body is heavy, is not prone to being fixed and positioned, and is unsafe.
SUMMARY An objective of the present invention is to provide a bearing and sample loading mechanism for a triaxial loading model for rocks, which may effectively solve the problems in 2 the background. 7500776 A technical solution for achieving the objective is as follows: a bearing and sample loading mechanism for a triaxial loading model for rocks comprises a stander, wherein a transversely arranged guide rail and a movable flat plate slidably mounted on the guide rail are mounted on the stander; and a driving mechanism for driving the movable flat plate to slide along the guide rail is further mounted on the stander; a model is arranged at one end of the stander, and an opening is formed in one end of the model; a sealing cover matched with an opening end of the model is arranged on the movable flat plate, a bearing plate which is horizontally distributed and used for placing a rock test piece is connected to the sealing cover; the driving mechanism is used for driving the movable flat plate to move frontwards along the guide rail and driving the rock test piece on the bearing plate to be conveyed into the model along the opening end of the model, and meanwhile, the opening end of the model is sealed with the sealing cover, and a bolt hole for being fixed to the model is formed in the circumferential direction of the sealing cover.
According to the bearing and sample loading mechanism disclosed by the present invention, a sealing cover body is fixed to the movable flat plate, the linear motion of the movable flat plate is achieved by use of the driving mechanism, thus achieving the movement of the sealing cover body; moreover, the operation is simple and labour-saving, and the sealing cover body is stable in movement and safe in mounting and dismounting.
Further, the rock test piece is supported on the bearing plate through a loading and unloading sample plate, a plurality of first semi-circular grooves are distributed on an upper end face of the bearing plate in a spaced manner, and a plurality of second semi-circular grooves corresponding to the first semi-circular grooves respectively are distributed on a lower end face of the loading and unloading sample plate, and the first semi-circular grooves and the second semi-circular grooves are combined to form a plurality of through circular holes; a cylindrical rod penetrates through each circular hole in a matched mode, and the two ends of the cylindrical rod extend out of the corresponding circular hole respectively.
Through the arrangement of the circular holes and the cylindrical rods in the circular holes, the rock test piece can be easily loaded (unloaded) by a forklift, therefore, the operation is simple, the cylindrical rods may play a role in positioning, and the damage to 3 edges and corners of the rock test piece due to direct contact with the rock test piece during 7500776 loading and unloading can be avoided.
Further, limiting steps which are matched with one another are arranged between one end, facing the model, of the loading and unloading sample plate and the bearing plate, thus achieving the positioning of the loading and unloading sample plate.
Further, two sides of a front end of the bearing plate are respectively connected with rollers making the bearing plate roll and displace in the model, aiming at reducing the friction force between the bearing plate and the bottom surface of the model, thus achieving the effect of labour saving.
Further, a square sealing groove is further formed in an inner side of the sealing cover, a sealing ring matched with the opening end of the model is arranged in the sealing groove, thus avoiding awkward situations that a core test piece is inconvenient to operate and even cannot be connected to a pipeline due to space limitation after being loaded in a model cavity.
Further, two ends of a threading hole are arranged to be step-shaped and are machined with internal threads, thus facilitating connection with pipe joints.
Further, to guarantee the effect of sealing, a sealing ring is arranged between the sealing cover and the model.
Further, to reduce oil inlet amount during detection, a compensation block is arranged between the rock test piece and the sealing cover, and the compensation block is connected tothe sealing cover.
Further, to reduce weight and increase strength, the compensation block is provided with cavities, a plurality of reinforcing ribs are arranged between the cavities, and each reinforcing rib is provided with a threaded counter bore which penetrates through the compensation block and used for being in threaded connection with the sealing cover.
Further, two ends of the stander are provided with limiting switches respectively, the limiting switches are matched with the movable flat plate and respectively used for controlling the driving mechanism to stop action when the movable flat plate is moved to an initial position and moved to a position where the sealing cover is matched with the model.
4
BRIEF DESCRIPTION OF THE DRAWINGS HUS00776 FIG. 1 is a structure diagram in accordance with the present invention; FIG. 2 is a diagram of a connection structure of a sealing cover and a compensation block in accordance with the present invention; FIG. 3 is a structure diagram of a rock test piece supported on a loading and unloading sample plate.
DESCRIPTION OF THE EMBODIMENTS As shown in FIGS. 1, 2, 3, a bearing and sample loading mechanism for a triaxial loading model for rocks provided by the present invention comprises a stander 1, wherein a transversely arranged guide rail 2 and a movable flat plate 4 slidably mounted on the guide rail 2 through a linear bearing 3 are mounted on the stander 1, and a driving mechanism 5 for driving the movable flat plate 4 to slide along the guide rail 2 is further mounted on the stander 1; the driving mechanism 5 comprises a lead screw 5.2 mounted on the stander 1 below the movable flat plate 4 through a bearing block 5.1, the lead screw 5.2 is in threaded connection with a nut 5.3 fixed to the movable flat plate 4, and a servo motor 5.4 and a reduction gear 5.5 which are used for driving the lead screw 5.2 to rate and are in transmission connection with each other are further mounted on the stander 1. A model 6 is arranged at one end of the stander 1, and an opening is formed in one end of the model 6, a sealing cover 7 matched with an opening end of the model 6 is arranged on the movable flat plate 4, and the sealing cover 7 is mounted on the movable flat plate 4 through a cushion block 8; the mounting height of the sealing cover 7 is controlled through the cushion block 8, a sealing cover body bracket 9 is connected between the sealing cover 7 and the movable flat plate 4, and a bearing plate 11 which is horizontally arranged and used for placing a rock test pipe 10 is connected to one side, facing the model 6, of the sealing cover 7; the driving mechanism 5 is used for driving the movable flat plate 4 to move forwards along the guide rail 2 and driving the rock test piece 10 on the bearing plate 11 to be conveyed into the model 6 along the opening end of the model 6, and meanwhile, the opening end of the model 6 is sealed with the sealing cover 7, and a bolt hole 12 for being fixed to the model 6 is formed in the circumferential direction of the sealing cover 7. 5
Two ends of the stander 1 are provided with limiting switches 30 respectively, the limiting 7500776 switches 30 are matched with the movable flat plate 4 and respectively used for controlling the driving mechanism 5 to stop action when the movable flat plate 4 is moved to an initial position and moved to a position where the sealing cover 7 is matched with the model 6.
A compensation block 22 is arranged between the rock test piece 10 and the sealing cover 7, and the compensation block 22 is provided with cavities; a plurality of reinforcing ribs 23 are arranged between the cavities, each reinforcing rib 23 is provided with a threaded counter bore 24 which penetrates through the compensation block 22 and used for being in threaded connection with the sealing cover 7, and a countersunk bolt 29 in threaded connection with the sealing cover is arranged in each threaded counter bore 24.
A threading hole 13 for a test pipeline of the rock test piece to penetrate through is formed in the sealing cover 7, two ends of the threading hole 13 are arranged to be step-shaped and are machined with internal threads; and sealing rings 14 are arranged in two ports of the threading hole 13.
A square sealing groove 15 is further formed in an inner side of the sealing cover 7, and a sealing ring 16 matched with the opening end of the model 6 is arranged in the sealing groove 15.
The rock test piece 10 is supported on the bearing plate 11 through a loading and unloading sample plate 16, two sides of a front end of the bearing plate 11 are respectively connected with rollers 21 making the bearing plate 11 roll and displace in the model 6; limiting steps 17 which are matched with one another are arranged between one end, facing the model 6, of the loading and unloading sample plate 16 and the bearing plate 11; a plurality of first semi-circular grooves 18 are distributed on an upper end face of the bearing plate 11 in a spaced manner, and a plurality of second semi-circular grooves 19 corresponding to the first semi-circular grooves 18 respectively are distributed on a lower end face of the loading and unloading sample plate 16, and the first semi-circular grooves 18 and the second semi-circular grooves 19 are combined to form a plurality of through circular holes; a cylindrical rod 20 penetrates through each circular hole in a matched mode, and the two ends of the cylindrical rod 20 extend out of the corresponding circular hole respectively.
6
A loading process of the mechanism: 7500776 the rock test piece 10 is placed on the loading and unloading sample plate 16, the cylindrical rod 20 is arranged in each second semi-circular groove 19 at the lower end face of the loading and unloading sample 16 in a matched mode, the rock test piece 10 on the loading and unloading sample 16 is moved to the bearing plate 11 by a forklift by taking the two ends of the cylindrical rod 20 extending out of the second semi-circular groove 19 as supporting points, and meanwhile, the cylindrical rod 20 is arranged in the corresponding first semi-circular groove 18 in a matched mode, and then a pipeline between the rock test piece and the sealing cover 7 is connected.
10 After the rock test piece 10 is carried in place, the servo motor 5.4 drives the movable flat plate 4 to move forwards along the guide rail 2 and drives the rock test piece 10 on the bearing plate 11 to be conveyed into the model 6 along the opening end of the model 6, and meanwhile, the opening end of the model 6 is sealed with the sealing cover 7, the sealing cover is fastened by the bolt.
The sample taking process of the mechanism disclosed by the present invention is opposite to the sample loading process, the specific principles are the same, which will not be described in detail here.
The rock test piece 10, the model 6, the pipeline connection of the rock test piece 10 and the test process described in the present invention are all prior art, and the structure and the test method thereof are not described in detail here. For example, a rock test piece, a structure of a model accommodating the rock test piece, and a test method are disclosed in a paper titled: Large-Scale True Triaxial Hydraulic Fracturing Simulation and Analysis by Chen Mian et al., Chinese Journal of Rock Mechanics and Engineering, Volume 19, June 2000.
7
Claims (10)
1. A bearing and sample loading mechanism for a triaxial loading model for rocks, comprising a stander, wherein a transversely arranged guide rail and a movable flat plate slidably mounted on the guide rail are mounted on the stander, and a driving mechanism for driving the movable flat plate to slide along the guide rail is further mounted on the stander; a model is arranged at one end of the stander, and an opening is formed in one end of the model; a sealing cover matched with an opening end of the model is arranged on the movable flat plate, a bearing plate which is horizontally distributed and used for placing a rock test piece is connected to the sealing cover; the driving mechanism is used for driving the movable flat plate to move frontwards along the guide rail and driving the rock test piece on the bearing plate to be conveyed into the model along the opening end of the model, and meanwhile, the opening end of the model is sealed with the sealing cover, and a bolt hole for being fixed to the model is formed in the circumferential direction of the sealing cover.
2. The bearing and sample loading mechanism for the triaxial loading model for rocks according to claim 1, wherein the rock test piece is supported on the bearing plate through a loading and unloading sample plate, a plurality of first semi-circular grooves are distributed on an upper end face of the bearing plate in a spaced manner, and a plurality of second semi-circular grooves corresponding to the first semi-circular grooves respectively are distributed on a lower end face of the loading and unloading sample plate, and the first semi-circular grooves and the second semi-circular grooves are combined to form a plurality of through circular holes; a cylindrical rod penetrates through each circular hole in a matched mode, and the two ends of the cylindrical rod extend out of the corresponding circular hole respectively.
3. The bearing and sample loading mechanism for the triaxial loading model for rocks according to claim 2, wherein limiting steps which are matched with one another are arranged between one end, facing the model, of the loading and unloading sample plate and the bearing plate.
4. The bearing and sample loading mechanism for the triaxial loading model for rocks according to claim 2, wherein two sides of a front end of the bearing plate are respectively connected with rollers making the bearing plate roll and displace in the model.
8
5. The bearing and sample loading mechanism for the triaxial loading model for rocks 7500776 according to claim 1, wherein a threading hole for a test pipeline of the rock test piece to penetrate through is formed in the sealing cover, and sealing rings are arranged in two ports of the threading hole.
6. The bearing and sample loading mechanism for the triaxial loading model for rocks according to claim 4, wherein two ends of the threading hole are arranged to be step-shaped and are machined with internal threads.
7. The bearing and sample loading mechanism for the triaxial loading model for rocks according to claim 1, wherein a sealing ring is arranged between the sealing cover and the model.
8. The bearing and sample loading mechanism for the triaxial loading model for rocks according to claim 1, wherein a compensation block is arranged between the rock test piece and the sealing cover, and the compensation block is connected to the sealing cover.
9. The bearing and sample loading mechanism for the triaxial loading model for rocks according to claim 8, wherein the compensation block is provided with cavities, a plurality of reinforcing ribs are arranged between the cavities, and each reinforcing rib is provided with a threaded counter bore which penetrates through the compensation block and used for being in threaded connection with the sealing cover.
10. The bearing and sample loading mechanism for the triaxial loading model for rocks according to claim 1, wherein two ends of the stander are provided with limiting switches respectively, the limiting switches are matched with the movable flat plate and respectively used for controlling the driving mechanism to stop action when the movable flat plate is moved to an initial position and moved to a position where the sealing cover is matched with the model.
9
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU500776A LU500776B1 (en) | 2021-10-22 | 2021-10-22 | Bearing and sample loading mechanism for triaxial loading model for rocks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU500776A LU500776B1 (en) | 2021-10-22 | 2021-10-22 | Bearing and sample loading mechanism for triaxial loading model for rocks |
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| Publication Number | Publication Date |
|---|---|
| LU500776B1 true LU500776B1 (en) | 2022-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU500776A LU500776B1 (en) | 2021-10-22 | 2021-10-22 | Bearing and sample loading mechanism for triaxial loading model for rocks |
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| LU (1) | LU500776B1 (en) |
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2021
- 2021-10-22 LU LU500776A patent/LU500776B1/en active IP Right Grant
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