CN110907285A - Miniature loading device for DVC method test - Google Patents
Miniature loading device for DVC method test Download PDFInfo
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- 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
- G01N3/14—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by dead weight, e.g. pendulum; generated by springs tension
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Abstract
The invention belongs to the technical field of material mechanical property testing, and relates to a micro loading device for a DVC method test; comprises the following steps: the loading driving mechanism, the bottom supporting mechanism, the frame and the transmission shaft are arranged on the frame; the loading driving mechanism and the bottom supporting mechanism synchronously rotate through a transmission shaft; the loading drive mechanism includes: the device comprises a ball screw assembly, an upper transmission gear set, a middle transmission strut, an upper platform plate, a middle platform plate, a die spring, a lower platform plate and an upper clamp; the bottom support mechanism includes: the lower clamp, the load sensor and the lower transmission gear set are arranged on the lower part of the frame; a base; when the hand wheel is rotated to drive the ball screw to move up and down, the middle platform plate of the loading driving mechanism connected with the lower end of the ball screw through the plane bearing moves up and down along with the ball screw, so that a die spring arranged in the loading driving mechanism generates tensile or compressive deformation, a load with a specified direction and size is accurately applied to a detected sample, and real-time monitoring is carried out through the load sensor.
Description
Technical Field
The invention belongs to the technical field of material mechanical property testing, and relates to a micro loading device for a DVC method test, which can be used for material mechanical property measurement, internal three-dimensional deformation field visualization analysis, damage expansion and damage mechanism research and nondestructive detection of parts in the fields of aerospace industry, nuclear industry, automobile industry, petroleum industry, ship and marine equipment industry, biomedicine, material science, civil engineering, mechanical manufacturing industry and the like.
Background
The novel material represented by a 3D printing material and a high-performance composite material is widely applied in the modern industrial field, due to the complexity of the material composition and the particularity of a forming process method, the deformation condition and damage expansion of the material interior are generally greatly different from the surface deformation and damage condition obtained by testing, the initiation and expansion of the interior damage under the action of an external load are key factors influencing the mechanical property of the material, and the damage is generally difficult to observe from the surface, so that the mechanical property of the material can not be evaluated by directly using the surface displacement and strain field of the material observed by a traditional observation method, and a novel three-dimensional full-field deformation measurement technology needs to be developed.
Among the currently used experimental mechanics methods, Digital Image Correlation (DIC) is a widely used full-field non-contact optical deformation measurement technique, and under the drive of the rapid development of volume imaging techniques such as X-ray computed tomography, the Digital image correlation method is popularized from surface measurement to internal measurement, and Digital Volume Correlation (DVC) is rapidly developed in recent years, and combines the full-field and non-contact characteristics of the optical mechanics method and the internal properties of the material that can be seen through volume imaging means such as CT technique, so that the DIC has obvious advantages in the aspect of visualization representation of deformation and damage evolution inside the measured material. In the DVC method test, signals such as X-rays generated and received by a CT (computed tomography) and other body imaging equipment can be used for observing the details of layering, pores, cracks, grain structures and density distribution in the object, and the obtained three-dimensional displacement field and three-dimensional strain field data can also be used as important controls of three-dimensional finite element analysis.
Similar to the process of measuring the surface deformation of the object by the DIC method, the process of measuring the internal deformation of the object by the DVC method can also be divided into three links: (1) using CT scanning imaging equipment to carry out circumferential scanning on a detected sample which is not loaded on a test platform and deforms under the action of different external loads, and reconstructing acquired experimental data to obtain three-dimensional digital body images before and after the sample deforms; (2) tracking and detecting the position change of a selected observation point in a sample three-dimensional font image before and after deformation, respectively defining the three-dimensional digital body image before and after deformation as a reference image and a target image, determining the corresponding relation before and after deformation by utilizing the gray level (density) distribution condition of a sub-block taking each selected discrete reference point as the center, and performing operation by using a local or global displacement measurement algorithm according to the position coordinates of the selected calculation point in the three-dimensional digital body image before and after deformation to determine a three-dimensional displacement field of a selected area; (3) and selecting corresponding displacement vector data from the three-dimensional displacement field containing the noise signals by adopting a proper numerical method such as a difference algorithm, a fitting algorithm or a differential algorithm and the like for operation, and finally obtaining a required three-dimensional strain field of the selected area to realize the aim of measuring by using the DVC method.
When internal deformation tests are carried out on various materials by using the DVC method, a related specialized test device needs to be established. Generally, the DVC method test device can be divided into two major components, namely a loading system and an imaging system, from the aspect of hardware, and the operation of the two major components is controlled by related operating software on a computer. The loading system is an in-situ loading device which can be matched with the existing CT scanning imaging equipment for use and is used for accurately applying tensile load or compressive load with specified size to a detected sample.
At present, most of the new-generation industrial CT scanning imaging equipment used in the field of nondestructive testing is provided with a closed integral metal shell so as to realize a good ray shielding effect, a tested sample is arranged on an object stage in the tested sample through a protective door, and the equipment is in a completely closed state in the scanning process. In view of the above, the in-situ loading device for DVC method test must have a small enough size to be installed inside the CT scanning imaging apparatus, and it should be considered in design that the combination of the specimen and the working component can be driven by the stage to rotate 360 degrees while the specimen is in the holding state.
Disclosure of Invention
The purpose of the invention is: a micro loading device for DVC method test is developed, which can be properly matched with a new generation of industrial CT scanning imaging equipment in the aspects of shape size and structural form, and can meet the requirements of continuously, stably, controllably and accurately applying tensile load and compressive load to a tested sample.
In order to solve the technical problem, the technical scheme of the invention is as follows:
a micro loading device for DVC method testing, the micro loading device comprising: the loading driving mechanism, the bottom supporting mechanism, the frame and the transmission shaft 7 are arranged; the loading driving mechanism and the bottom supporting mechanism synchronously rotate through a transmission shaft 7;
the frame comprises a top cover 4, a frame strut 5 and a base 22; the outer edge of the top cover 4 and the outer edge of the base 22 are supported by a frame strut 5;
the loading drive mechanism includes: the device comprises a ball screw assembly, an upper transmission gear set 6, a middle transmission strut 8, an upper platform plate 9, a middle platform plate 11, a die spring 12, a lower platform plate 13 and an upper clamp 15;
the ball screw assembly consists of a ball screw 2 and a fixing piece;
the ball screw 2 sequentially penetrates through the top cover 4, the driven wheel of the upper transmission gear set 6, the upper platform plate 9 and the middle platform plate 11, and is fixed with the driven wheel and the middle part of the top cover 4 through fixing pieces; the top end of the ball screw 2 is fixed with the middle platform plate 11;
the middle force transmission strut 8 is connected with an upper platform plate 9 and a lower platform plate 13 through a middle platform plate 11; the middle force transmission strut 8 is assembled with the middle platform plate 11 in an interference fit manner;
the central axes of the upper platform plate 9, the middle platform plate 11 and the lower platform plate 13 are superposed with the central axis of the loading device; the upper platform plate 9 and the middle platform plate 11, and the middle platform plate 11 and the lower platform plate 13 are connected through a die spring 12;
an upper clamp 15 is fixed in the middle of the bottom of the lower platform plate 13;
the bottom support mechanism includes: a lower clamp 17, a load sensor 19, a lower transmission gear set 21; a base 22;
the lower transmission gear set 21 is fixed on the base 22, a driving wheel in the lower transmission gear set 21 is fixedly connected with the load sensor 19, and the center of the driving wheel is fixed on the central axis of the loading device; the lower clamp 17 is fixed to the upper middle portion of the load cell 19.
The ball screw assembly is characterized in that a bearing matched with the ball screw 2 is arranged in the middle of the fixing piece, the fixing piece penetrates through the top cover 4 to be fixed with a driven wheel of the upper transmission gear set 6, and the fixing piece is fixed with the top cover 4 and the driven wheel respectively. The fixing way of the fixing piece, the top cover 4 and the upper transmission gear set 6 can be any one of bolts, flanges, glue or welding.
The top end of the ball screw 2 is fixed with the middle platform plate 11 through a plane bearing 10.
Preferably, the middle of the bottom of the lower platform plate 13 is fixed with an upper clamp 15 through an upper clamp adapter 14. The upper clamp adapter 14 is used for matching different clamps, and improves applicability.
The lower drive gear set 21 is fixed to a base 22 by a lower angular contact ball bearing 20.
Preferably, the load cell 19 is fixed to the lower clamp 17 by a lower clamp adapter 18. The lower clamp adapter 18 is used for matching different clamps, and improves applicability.
The upper transmission gear set 6 and the lower transmission gear set 21 are both composed of a large-diameter gear and a small-diameter gear, the central axis of the large-diameter gear is superposed with the central axis of the loading device, and the small-diameter gear is arranged on the side surface of the loading device; in the upper transmission gear set 6, the small-diameter gear is a driving gear, and the large-diameter gear is a driven gear; in the lower transmission gear set 21, the large-diameter gear is a driving gear, and the small-diameter gear is a driven gear; the transmission shaft 7 is connected with two small-diameter gears.
Preferably, the top cover 4 and the base 22 are respectively provided with a positioning groove, and the end parts of the two ends of the transmission shaft 7 are respectively positioned in the positioning grooves of the top cover 4 and the base 22; the positioning grooves are blind holes and are respectively arranged at the lower part of the top cover 4 and the upper part of the base 22.
Preferably, the tail end of the ball screw 2 is provided with a hand wheel or a handle, so that the ball screw can be conveniently gripped to apply loads.
The middle part of the bottom of the base 22 is provided with a docking seat ring 23 for matching and positioning with a three-jaw chuck on a CT device objective table.
The frame struts 5 are force bearing members, and preferably, the number of the frame struts 5 is 3 or 4.
The invention has the beneficial effects that: the micro loading device provided by the invention is mainly used for carrying out a test by matching with a CT scanning imaging device adopting a circumferential scanning mode, the bottom butt joint seat ring 23 of the loading device and the objective table of the CT scanning imaging device are fixed by the three-jaw chuck 24, namely, all working parts including the detected sample 16 can be driven to carry out circumferential motion by the rotation of the objective table, so that the in-situ scanning imaging of the detected sample 16 in a loaded state is realized, and a hardware basis is provided for observing a three-dimensional deformation field in a sample material by applying a DVC method and researching the damage expansion and damage mechanism of the material. The open external frame design enables the X-ray emission device 25 of the CT scanning imaging device to penetrate into the loading device and irradiate close to the detected sample as much as possible, thereby improving the resolution of the acquired three-dimensional digital body image to the maximum extent.
The micro loading device has good load-holding performance, can measure the load in real time through the load sensor, and has the advantages that the composition materials are easy to obtain, and all parts are easy to process and assemble.
The micro loading device provided by the invention is used as an important corollary device of CT scanning imaging equipment, and has a wide application prospect in the fields of non-contact measurement research of experimental mechanics and nondestructive testing of materials. .
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the embodiment of the present invention will be briefly explained. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of the overall structure of a micro loading device according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the operation of the micro loading device according to the preferred embodiment of the present invention;
FIG. 3 is a schematic view of a portion of a loading actuator of the micro-loading unit in accordance with a preferred embodiment of the present invention;
FIG. 4 is a schematic view of a tensile test piece to be tested of the micro loading device according to the preferred embodiment of the present invention;
FIG. 5 is a schematic view of the connection between the bottom docking seat of the micro loader and the three-jaw chuck on the stage of the CT scanning imaging device;
the device comprises a hand wheel 1, a ball screw 2, an upper angular contact ball bearing 3, a top cover 4, a frame support 5, an upper transmission gear set 6, a transmission shaft 7, a middle transmission support 8, an upper platform plate 9, a plane bearing 10, an intermediate platform plate 11, a mold spring 12, a lower platform plate 13, an upper clamp adapter port 14, an upper clamp 15, a sample 16, a lower clamp 17, a lower clamp adapter port 18, a load sensor 19, a lower angular contact ball bearing 20, a lower transmission gear set 21, a base 22, a base 23, a bottom butt joint seat ring 24, a CT equipment object stage three-jaw chuck 25, a CT equipment X-ray emitting device 26, a CT equipment X-ray receiving device 27 and a screw fixing piece 27.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Features of various aspects of embodiments of the invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. The following description of the embodiments is merely intended to better understand the present invention by illustrating examples thereof. The present invention is not limited to any particular arrangement or method provided below, but rather covers all product structures, any modifications, alterations, etc. of the method covered without departing from the spirit of the invention.
In the drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the present invention.
As shown in fig. 1, the micro loading device of this embodiment includes a hand wheel 1, a ball screw and its fixing member 2, an upper angular contact ball bearing 3, a top cover 4, a frame pillar 5, an upper transmission gear set 6, a transmission shaft 7, a middle transmission pillar 8, an upper platform plate 9 of a loading driving mechanism, a plane bearing 10, an intermediate platform plate 11 of the loading driving mechanism, a mold spring 12, a lower platform plate 13 of the loading driving mechanism, an upper clamp adapter port 14, an upper clamp 15, a lower clamp 17, a lower clamp adapter port 18, a load sensor 19, a lower angular contact ball bearing 20, a lower transmission gear set 21, a base 22, a bottom butt-joint race 23, and other components. Wherein, the outer ring of the upper angular contact ball bearing 3 is fixed on the top cover 4, the inner ring is connected with the fixed part 2 attached to the ball screw, the outer ring of the lower angular contact ball bearing 20 is fixed on the base 22, and the inner ring is connected with the bottom butt-joint seat ring 23; the upper end of the ball screw 2 is connected with the hand wheel 1, the lower end of the ball screw passes through a large-diameter round hole in the center of an upper platform plate 9 of the loading driving mechanism and is connected with the inner ring of a plane bearing 10, and the fixing part of the ball screw is connected with an upper transmission gear set 6; the center part of a middle platform plate 11 of the loading driving mechanism is connected with the outer ring of a plane bearing 10, the upper surface of the middle platform plate is connected with an upper platform plate 9 of the loading driving mechanism through a mould spring 12, and the lower surface of the middle platform plate is connected with a lower platform plate 13 of the loading driving mechanism through a mould spring 12; the central part of the middle force transmission strut 8 passes through a clearance fit hole distributed on a middle platform plate 11 of the loading driving mechanism, the upper end of the middle force transmission strut is connected with an upper platform plate 9 of the loading driving mechanism, the lower end of the middle force transmission strut is connected with a lower platform plate 13 of the loading driving mechanism, and the lower surface of the lower platform plate 13 of the loading driving mechanism is connected with an upper clamp adapter port 14; the upper end of the load sensor 19 is connected with the lower clamp adapter 18, and the lower end of the load sensor is connected with the inner ring of the lower angular contact ball bearing 20; the lower transmission gear set 21 is connected with the lower end of the load sensor 19 and synchronously rotates with the upper transmission gear set 6 under the action of the transmission shaft 7; the lower end of the upper clamp adapter port 14 is connected with the upper clamp 15, the upper end of the lower clamp adapter port 18 is connected with the lower clamp 17, and the lower end of the lower clamp adapter port is connected with the upper end of the load sensor 19; the upper clamp 15 and the lower clamp 17 are used for clamping and fixing a sample 16 to be detected, when the hand wheel 1 is rotated to enable the ball screw 2 to drive the loading driving mechanism middle platform plate 11 to move up and down, tensile load or compressive load generated by deformation of the die spring 12 is transmitted to the sample 16 to be detected through the action of the upper clamp 15 and the lower clamp 17; the upper end of the frame pillar 5 is connected to the top cover 4, the lower end is connected to the base 22, and the portion protruding from the lower surface of the base 22 serves as a leg of the loading device.
Wherein the middle force transmission strut 8 and the die spring 12 are all arranged in a mode of surrounding the circumference of the ball screw 2 and are connected with the upper platform plate 9 of the loading driving mechanism, the middle platform plate 11 of the loading driving mechanism and the lower platform plate 13 of the loading driving mechanism.
The micro loading device of the embodiment is used in cooperation with a CT scanning imaging device which adopts a circumferential scanning mode and is provided with a rotatable object stage, and is used for carrying out in-situ scanning imaging on detected samples in different loading states and acquiring a three-dimensional digital body image containing deformation field information inside sample materials.
The upper clamp 15 and the lower clamp 17 in the micro loading device of the embodiment can be used for fixing the sample 16 to be detected, and the combination body formed by the clamp and the sample is connected into the loading device through the upper clamp adapter 14 and the lower clamp adapter 18; when the handwheel 1 is rotated to drive the ball screw 2 to move up and down, the middle platform plate 11 of the loading driving mechanism connected with the lower end of the ball screw 2 through the plane bearing 10 also moves up and down, so that a mould spring 12 arranged in the loading driving mechanism generates tensile or compression deformation, a load with a specified direction and size is accurately applied to a detected sample, and real-time monitoring is carried out through a load sensor 19, and the existence of the plane bearing 10 can be used for eliminating torsional load interference caused by the rotation of the ball screw 2;
wherein, the state change process of the die spring 12 is specifically as follows: when the loading driving mechanism is used for generating tensile load, the die spring 12 connecting the upper platform plate 9 of the loading driving mechanism and the middle platform plate 11 of the loading driving mechanism is in a compressed state, and the die spring 12 connecting the middle platform plate 11 of the loading driving mechanism and the lower platform plate 13 of the loading driving mechanism is in a tensile state; when the loading driving mechanism is used for generating a compression load, the die springs 12 connecting the loading driving mechanism upper platen 9 and the loading driving mechanism intermediate platen 11 are in a tensile state, and the die springs 12 connecting the loading driving mechanism intermediate platen 11 and the loading driving mechanism lower platen 13 are in a compression state.
The main working components in the loading device are connected with the external frame structure thereof through an upper angular contact ball bearing 3 and a lower angular contact ball bearing 20, can rotate around a central axis under the driving of an object stage of CT scanning imaging equipment, and can ensure that the working components on the upper side and the lower side of the sample can synchronously rotate through the matching motion of an upper transmission gear set 6, a lower transmission gear set 21 and a transmission shaft 7 which are fixed on the upper end and the lower end so as to eliminate the possible torsional load interference; the bottom butt joint seat ring 23 of the loading device is fixed with the objective table of the CT scanning imaging device through the three-jaw chuck 24, namely, all working components including the detected sample 16 are driven to perform circular motion through the rotation of the objective table, so that the in-situ scanning imaging of the detected sample in a loaded state is realized. Fig. 2 to 5 respectively show the state of receiving X-ray radiation during the operation of the micro loading device, the detailed structure of the loading driving mechanism part, and the connection mode of the tested sample 16 and the bottom docking seat 23 with the three-jaw chuck 24 on the object stage of the CT scanning imaging device used in cooperation.
In this embodiment, the frame support 5, the top cover 4 and the base 22 together form an external force-bearing structure of the entire micro loading device, and the structural design makes the side surface of the micro loading device have a larger opening, so as to allow the X-ray emitting device 25 of the CT scanning imaging apparatus to penetrate into the loading device, irradiate close to the detected sample 16 as much as possible, and collect signals through the X-ray receiving device 26, thereby improving the resolution of the acquired three-dimensional digital body image to the maximum extent, as shown in fig. 2, by analyzing and operating the three-dimensional font images of the detected sample 16 under different loading states, the three-dimensional displacement field data and the three-dimensional strain field data can be further acquired. When the micro loading device carrying the tested sample 16 is placed in the CT scanning imaging device for circumferential scanning, the hand wheel 1 mounted on the top must stop rotating, and at this time, the micro loading device is in a load-holding state.
The foregoing disclosure shows in detail preferred embodiments of the invention. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, all technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A micro-loading device for DVC method testing, the micro-loading device comprising: the loading driving mechanism, the bottom supporting mechanism, the frame and the transmission shaft (7); the loading driving mechanism and the bottom supporting mechanism synchronously rotate through a transmission shaft (7);
the frame comprises a top cover (4), a frame strut (5) and a base (22); the outer edge of the top cover (4) and the outer edge of the base (22) are supported by a frame strut (5);
the loading drive mechanism includes: the device comprises a ball screw assembly, an upper transmission gear set (6), a middle transmission strut (8), an upper platform plate (9), a middle platform plate (11), a die spring (12), a lower platform plate (13) and an upper clamp (15);
the ball screw assembly consists of a ball screw (2) and a fixing piece;
the ball screw (2) sequentially penetrates through the top cover (4), a driven wheel of the upper transmission gear set (6), an upper platform plate (9) and a middle platform plate (11) and is fixed with the driven wheel and the middle of the top cover (4) through fixing pieces; the top end of the ball screw (2) is fixed with the middle platform plate (11);
the middle force transmission strut (8) is connected with the upper platform plate (9) and the lower platform plate (13) through a middle platform plate (11); the middle force transmission strut (8) is assembled with the middle platform plate (11) in an interference fit manner;
the central axes of the upper platform plate (9), the middle platform plate (11) and the lower platform plate (13) are superposed with the central axis of the loading device; the upper platform plate (9) and the middle platform plate (11) and the lower platform plate (13) are connected through a die spring (12);
an upper clamp (15) is fixed in the middle of the bottom of the lower platform plate (13);
the bottom support mechanism includes: a lower clamp (17), a load sensor (19) and a lower transmission gear set (21); a base (22);
the lower transmission gear set (21) is fixed on the base (22), a driving wheel in the lower transmission gear set (21) is fixedly connected with the load sensor (19), and the center of the driving wheel is fixed on the central axis of the loading device; the middle part of the upper part of the load sensor (19) is fixed with a lower clamp (17).
2. The micro loading device for DVC method testing according to claim 1, wherein: the ball screw assembly is characterized in that a bearing matched with the ball screw (2) is arranged in the middle of the fixing piece, the fixing piece penetrates through the top cover (4) to be fixed with a driven wheel of the upper transmission gear set (6), and the fixing piece is fixed with the top cover (4) and the driven wheel respectively.
3. The micro loading device for DVC method testing according to claim 1, wherein: the top end of the ball screw (2) is fixed with the middle platform plate (11) through a plane bearing (10).
4. The micro loading device for DVC method testing according to claim 1, wherein: the middle part of the bottom of the lower platform plate (13) is fixed with an upper clamp (15) through an upper clamp adapter (14).
5. The micro loading device for DVC method testing according to claim 1, wherein: the lower transmission gear set (21) is fixed on a base (22) through a lower angular contact ball bearing (20).
6. The micro loading device for DVC method testing according to claim 1, wherein: the load sensor (19) is fixed with the lower clamp (17) through a lower clamp adapter (18).
7. The micro loading device for DVC method testing according to claim 1, wherein: the upper transmission gear set (6) and the lower transmission gear set (21) are both composed of a large-diameter gear and a small-diameter gear, the central axis of the large-diameter gear is superposed with the central axis of the loading device, and the small-diameter gear is arranged on the side surface of the loading device; in the upper transmission gear set (6), the small-diameter gear is a driving gear, and the large-diameter gear is a driven gear; in the lower transmission gear set (21), the large-diameter gear is a driving gear, and the small-diameter gear is a driven gear; the transmission shaft (7) is connected with two small-diameter gears.
8. The micro loading device for DVC method testing according to claim 1, wherein: positioning grooves are respectively formed in the top cover (4) and the base (22), and the end parts of the two ends of the transmission shaft (7) are respectively positioned in the positioning grooves in the top cover (4) and the base (22); the positioning grooves are blind holes and are respectively arranged on the lower part of the top cover (4) and the upper part of the base (22).
9. The micro loading device for DVC method testing according to claim 1, wherein: the tail end of the ball screw (2) is provided with a hand wheel or a handle.
10. The micro loading device for DVC method testing according to claim 1, wherein: the middle part of the bottom of the base (22) is provided with a butt-joint seat ring (23).
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