CN219284905U - Maximum shearing force resistance testing device for building joists - Google Patents

Abstract

The utility model discloses a device for testing the maximum shearing resistance of a building keel, which comprises a rack, wherein a testing mechanism is arranged on the rack; the test mechanism vertically outputs a first linear degree of freedom to the shearing piece, and the shearing piece is attached to the tested keel to output shearing force; the utility model can realize the following technical advantages in the practical application process through the multi-degree-of-freedom linkage and mutual coordination between the adjusting mechanism and the testing mechanism: (1) can adapt to fossil fragments of different specifications and test: the hydraulic cylinder can adjust the general height and direction through the servo electric cylinder, so that the hydraulic cylinder can adapt to keels of different specifications for testing. This makes the technique very versatile and adaptable. (2) The horizontal direction of fossil fragments can be adjusted through adjustment mechanism and test: the horizontal direction of fossil fragments is adjusted through adjustment mechanism, the biggest shear force that resists of fossil fragments of different positions can be tested, this comprehensiveness and the accuracy of test have been improved.

Description

Maximum shearing force resistance testing device for building joists

Technical Field

The utility model relates to the technical field of constructional engineering, in particular to a device for testing the maximum shearing resistance of a building keel.

Background

Keels in construction engineering generally refer to the primary support structure from which a suspended ceiling, partition, or other decorative element is suspended. Traditionally, keels have been made of standard size metal or wood, but as architectural designs become more and more personalized, more and more non-standardized keels have grown. The manufacture of non-standardized keels requires the reliance on advanced processing techniques and efficient manufacturing procedures.

The fabrication of non-standardized keels also requires consideration of material selection and structural stability. In selecting materials, various factors such as load, environment, cost, etc. need to be considered according to practical situations. While ensuring the strength and rigidity of the material, the shape and structure of the keels need to be fully considered to ensure the stability and reliability thereof. In view of the above, the fabrication of non-standardized keels requires reliance on advanced techniques and processes, as well as thorough knowledge and control of materials, structures and processes by designers.

The inventor finds that the necessity of processing a sample to perform an actual maximum shear resistance test is very important after the non-standard keel theory is designed. This is because:

(1) First, the actual maximum shear test can verify the correctness of the theoretical design. Theoretical design is an important foundation for building keel manufacture, but due to the fact that many complex factors are involved in building engineering, the theoretical design is difficult to fully consider all practical situations. The actual test may verify the correctness of the theoretical design to determine if the design meets the requirements.

(2) Second, the actual maximum shear test can determine the strength and stability of the building joist. Non-standardized construction keels generally have unique shapes and structures, so their strength and stability are difficult to determine empirically or theoretically. Practical tests can directly measure the maximum bearing capacity and shearing resistance of the building joist, thereby determining the strength and stability thereof.

(3) Thirdly, the safety of the building joists can be ensured by the practical maximum shear force test. The building joists are often used as part of the building structure to carry the weight of the decorative elements such as ceilings, partitions, etc., and if they are not strong enough or are not stable enough, they may cause the decorative elements to fall off or the entire building structure to be unstable. The safety of the building joist can be ensured by the practical test, so that the stability and safety of the whole building structure are ensured.

Therefore, a maximum shearing resistance testing device for building keels is provided.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a device for testing the maximum shear resistance of a building joist, so as to solve or alleviate the technical problems existing in the prior art, and at least provide a beneficial choice;

the technical scheme of the embodiment of the utility model is realized as follows: the device for testing the maximum shearing resistance of the building joists comprises a frame, wherein a testing mechanism is arranged on the frame; the test mechanism vertically outputs a first linear degree of freedom to the shearing piece, and the shearing piece is attached to the tested keel to output shearing force; the tested keel outputs a second linear degree of freedom carrying adjustment azimuth by the adjustment mechanism, and the second linear degree of freedom is staggered with the axial direction of the first linear degree of freedom.

In the above embodiment, the maximum shearing force testing device for the building joists has the main function of testing the limit of the building joists in the shearing bearing capacity. The shear member is in contact with the keel under test to measure the shear force output by the keel under test. The tested keel outputs a second linear degree of freedom by the adjustment mechanism to carry and adjust the orientation. The axes of the first and second linear degrees of freedom are in a staggered state. In the testing process, the azimuth of the keel can be finely adjusted according to the requirement so as to ensure the accuracy of the testing result. In addition, the output force of the testing mechanism can be adjusted through the control device so as to meet different testing requirements.

Wherein in one embodiment: the test mechanism comprises a lifting table, and a second telescopic cylinder for outputting the first linear degree of freedom is arranged on the lifting table; and a piston rod of the second telescopic cylinder is connected with the shearing piece.

In the above embodiment, the main purpose of the embodiment is to change the contact force between the shearing member and the tested keel by adjusting the height of the lifting platform so as to achieve the measurement of the shearing force output by the tested keel.

In the above embodiment, when the device is used for testing, the tested keel is first placed on the shear member, and then the second linear degree of freedom is output by the adjusting mechanism, so that the tested keel is fixed on the testing device. And then, adjusting the contact force between the shearing piece and the tested keel through the height adjustment of the lifting table so as to enable the shearing piece to reach a proper testing state.

Wherein in one embodiment: the testing mechanism further comprises a first telescopic cylinder; the first telescopic cylinder is vertically arranged, and a cylinder body and a piston rod of the first telescopic cylinder are respectively connected to the top of the frame and the upper part of the lifting platform; the lifting platform is vertically matched with the frame in a sliding manner.

In the above embodiment, the first telescopic cylinder is used for adjusting the height of the testing mechanism and enabling the shearing piece to be perpendicular to the tested keel. The lifting platform can vertically and slidably match with the frame so that the second telescopic cylinder can apply shearing force to the tested keel. The first and second telescopic cylinders together output a first linear degree of freedom for testing shear forces.

Wherein in one embodiment: the adjusting mechanism comprises an electric claw; the tested keels are clamped and clamped by the electric clamping jaws.

In the above embodiment, the adjusting mechanism of the device for testing the maximum shearing resistance of the building joist comprises an electric claw which can clamp and fix the tested joist.

Wherein in one embodiment: the adjusting mechanism comprises a truss horizontally and fixedly connected to the frame; the sliding table is in sliding fit with the top of the truss along the horizontal plane, and the electric clamping jaw is arranged on the sliding table; the linear module is arranged between the truss and the sliding table, and the linear module outputs the second linear degree of freedom to slide on the sliding table.

In the above embodiment, the adjusting mechanism adopts a structure of a truss and a sliding table, the truss is horizontally and fixedly connected to the frame, and the sliding table is slidably matched with the top of the truss along a horizontal plane. The electric claw is arranged on the sliding table and can be clamped with the tested keel. In addition, a linear module is arranged between the truss and the sliding table and used for outputting a second linear degree of freedom. In the test, the adjusting mechanism can control the movement of the linear module, so that the azimuth of the tested keel can be adjusted.

Wherein in one embodiment: the linear module comprises a power piece and a gear rack assembly driven by the power piece; the power piece is fixedly connected to the sliding table.

In the above embodiment, the linear module includes a power member and a rack and pinion assembly driven by the power member. The power piece is fixedly connected to the sliding table, and the gear rack assembly is coupled with the power piece through a gear, so that power transmission and linear motion control are realized.

Wherein in one embodiment: the gear rack assembly comprises a gear and a rack which are meshed with each other; the gear is driven to rotate by the power piece, and the rack is fixedly connected to the truss.

In the above embodiments, the rack and pinion assembly is composed of two parts, namely a rack and pinion. The two parts are realized through meshing, the gear is driven to rotate by the power piece, and the rack is fixedly connected with the truss. When the power member drives the gear to rotate, the meshing action between the gear and the rack causes the rack to move in the direction of the truss.

Compared with the prior art, the utility model has the beneficial effects that: the utility model can realize the following technical advantages in the practical application process through the multi-degree-of-freedom linkage and mutual coordination between the adjusting mechanism and the testing mechanism:

(1) The test can be carried out on keels which are suitable for different specifications: the hydraulic cylinder can adjust the general height and direction through the servo electric cylinder, so that the hydraulic cylinder can adapt to keels of different specifications for testing. This makes the technique very versatile and adaptable.

(2) The horizontal direction of fossil fragments can be adjusted through adjustment mechanism and test: the horizontal direction of fossil fragments is adjusted through adjustment mechanism, the biggest shear force that resists of fossil fragments of different positions can be tested, this comprehensiveness and the accuracy of test have been improved.

(3) Automatic testing can be realized, and human errors are reduced: by using the hydraulic cylinder and the servo electric cylinder, automatic test can be realized, personal errors are reduced, and the accuracy and repeatability of the test are improved.

(4) The test efficiency can be improved: because the technology adopts the hydraulic cylinder for testing, the testing process is quick and simple, and the testing efficiency can be improved.

(5) The safety of the test can be ensured: because the hydraulic cylinder can control the shearing force of the test, the safety of the test can be ensured, and accidents in the test are avoided.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the technical descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a perspective view of the present utility model;

FIG. 2 is a perspective view of another embodiment of the present utility model;

FIG. 3 is a schematic perspective view of a testing mechanism according to the present utility model;

FIG. 4 is a schematic perspective view of an adjusting mechanism according to the present utility model;

FIG. 5 is an enlarged perspective view of the area A of FIG. 4 according to the present utility model;

FIG. 6 is a programming control diagram of the present utility model.

Reference numerals: 1. a frame; 2. a testing mechanism; 201. a first telescopic cylinder; 202. a lifting table; 203. a second telescopic cylinder; 204. a shear member; 3. an adjusting mechanism; 301. truss; 302. a sliding table; 303. a power member; 304. a rack and pinion assembly; 305. and (5) an electric claw.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. This utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below;

it should be noted that the terms "first," "second," "symmetric," "array," and the like are used merely for distinguishing between description and location descriptions, and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of features indicated. Thus, a feature defining "first," "symmetry," or the like, may explicitly or implicitly include one or more such feature; also, where certain features are not limited in number by words such as "two," "three," etc., it should be noted that the feature likewise pertains to the explicit or implicit inclusion of one or more feature quantities;

in the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature; meanwhile, all axial descriptions such as X-axis, Y-axis, Z-axis, one end of X-axis, the other end of Y-axis, or the other end of Z-axis are based on a cartesian coordinate system.

In the present utility model, unless explicitly specified and limited otherwise, terms such as "mounted," "connected," "secured," and the like are to be construed broadly; for example, the connection can be fixed connection, detachable connection or integrated molding; the connection may be mechanical, direct, welded, indirect via an intermediate medium, internal communication between two elements, or interaction between two elements. The specific meaning of the terms described above in the present utility model will be understood by those skilled in the art from the specification and drawings in combination with specific cases.

In the nonstandard keels in the prior art, the correctness of theoretical design can be verified by the actual maximum shear resistance test of the newly designed nonstandard keels. Theoretical design is an important foundation for building keel manufacture, but due to the fact that many complex factors are involved in building engineering, the theoretical design is difficult to fully consider all practical situations. The correctness of the theoretical design can be verified through the actual test, so that whether the design meets the requirements or not is determined; for this reason, referring to fig. 1-5, the present utility model provides a technical solution to solve the above technical problems: the device for testing the maximum shearing resistance of the building joists comprises a frame 1, wherein a testing mechanism 2 is arranged on the frame 1; the testing mechanism 2 vertically outputs a first linear degree of freedom to the shearing piece 204, and the shearing piece 204 is attached to the tested keel to output shearing force; the tested keel outputs a second linear degree of freedom carrying adjustment direction by the adjustment mechanism 3, and the second linear degree of freedom is staggered with the axial direction of the first linear degree of freedom.

In the above embodiment, the maximum shearing force testing device for the building joists has the main function of testing the limit of the building joists in the shearing bearing capacity. The device comprises a frame 1 and a testing mechanism 2. The frame 1 is used for supporting a test mechanism 2. The test mechanism 2 outputs a first linear degree of freedom vertically to the shear 204. The shear member 204 is in contact with the keel under test to measure the shear force output by the keel under test. The keel under test is output a second linear degree of freedom by the adjustment mechanism 3 to carry and adjust the orientation. The axes of the first and second linear degrees of freedom are in a staggered state.

In this embodiment, the keel to be tested is first mounted on the adjustment mechanism 3 and oriented with the second linear degree of freedom adjusted to make vertical contact with the shear 204. The test mechanism 2 then outputs a force perpendicular to the shear 204 through the first linear degree of freedom, which the shear 204 converts to a shear force and applies to the keel under test, measuring the limits of its shear load capacity.

Specifically, the direction of the keel can be finely adjusted according to the requirement so as to ensure the accuracy of the test result. In addition, the output force of the testing mechanism 2 can be regulated by the control device to meet different testing requirements.

In this embodiment, the test mechanism 2 and the adjustment mechanism 3 are main functional mechanisms in the device provided in this embodiment; on the basis of the above mechanism, it is arranged on the frame 1; specifically, the frame 1 is used as a reference supporting structure of the whole device, provides a foundation for the device to cooperate with the external environment, and can be matched with external staff to carry out maintenance, adjustment, assembly of related parts and other conventional mechanical maintenance operations;

in some embodiments of the present application, please refer to fig. 3 in combination: the test mechanism 2 comprises a lifting table 202, and a second telescopic cylinder 203 for outputting a first linear degree of freedom is arranged on the lifting table 202; the piston rod of the second telescopic cylinder 203 is connected to the shear 204.

In this solution, the test mechanism 2 comprises a lifting table 202 and a second telescopic cylinder 203. The lift table 202 is mounted on the frame 1 and is used to output a first linear degree of freedom. A second telescopic cylinder 203 is then connected to the lifting table 202 and its piston rod is connected to the shear 204. The primary purpose of this embodiment is to vary the contact force of the shear member 204 with the keel under test by height adjustment of the lift table 202 to achieve a measurement of the keel under test output shear force.

Specifically, when the device is used for testing, the keel under test is first placed on the shear member 204, and then the second linear degree of freedom is output by the adjusting mechanism 3, so that the keel under test is fixed on the testing device. Next, the contact force of the shear member 204 with the keel under test is adjusted to achieve the proper test condition by height adjustment of the lift table 202. The second expansion cylinder 203 will then exert a shearing force downwardly through its piston rod, causing the keel under test to deform under the influence of the shear 204. The deformation is detected by a feedback sensor of a second telescopic cylinder in the testing mechanism 2, and the maximum shearing resistance of the tested keel is calculated. The main principle of this embodiment is therefore to measure the maximum shear resistance of the tested keel by adjusting the height of the lift table 202 and applying the shear force.

In this scheme, the frame 1 and the lifting platform 202 are in a sliding fit connection relationship, and a sliding table assembly is further arranged on one side of each sliding table assembly, and the arrangement axial direction of the sliding table assembly is the same as the sliding direction of the components, so as to adapt to the corresponding linear degree of freedom, provide guiding stability during operation, and standardize the running track of the linear degree of freedom to meet the theoretical design and practical application requirements;

specifically, the sliding table assembly comprises a sliding block and a sliding rail which are in sliding fit with each other; the sliding block is fixedly connected to the frame 1, and the sliding rail is fixedly connected to the lifting table 202;

specifically, the sliding table assemblies are preferably two groups, and are respectively arranged in mutually symmetrical directions between the frame 1 and the lifting table 202, so as to provide a symmetrical sliding driving mode to improve the stability of the sliding table assemblies in the sliding adjustment process.

In the scheme, all electric elements of the whole device are powered by mains supply; specifically, the electric elements of the whole device are in conventional electrical connection with the commercial power output port through the relay, the transformer, the button panel and other devices, so that the energy supply requirements of all the electric elements of the device are met.

Specifically, a controller is further arranged outside the device and is used for connecting and controlling all electrical elements of the whole device to drive according to a preset program as a preset value and a drive mode; it should be noted that the driving mode corresponds to output parameters such as start-stop time interval, rotation speed, power and the like between the relevant electrical components in the context, and meets the requirement that the relevant electrical components drive the relevant mechanical devices to operate according to the functions described in the relevant mechanical devices.

In some embodiments of the present application, please refer to fig. 3 in combination: the test mechanism 2 further comprises a first telescopic cylinder 201; the first telescopic cylinder 201 is vertically arranged, and the cylinder body and the piston rod of the first telescopic cylinder are respectively connected with the top of the frame 1 and the upper part of the lifting platform 202; the lifting table 202 is vertically and slidably matched with the frame 1.

In this solution, the test mechanism 2 comprises a first telescopic cylinder 201 and a lifting table 202. The first telescopic cylinder 201 is vertically arranged, and the cylinder body and the piston rod are respectively connected to the top of the frame 1 and the upper part of the lifting table 202. The piston rod is connected to a second telescopic cylinder 203 on the lifting table 202. The first telescopic cylinder 201 is used to adjust the height of the remaining components of the test mechanism 2 to accommodate different sized or contoured keels with the shear 204 perpendicular to the keel under test. The lifting platform 202 can vertically slidably engage the frame 1 to enable the second telescopic cylinder 203 to apply shear forces to the keel under test. The first telescopic cylinder 201 and the second telescopic cylinder 203 together output a first linear degree of freedom for testing the shear force.

It should be noted that in this embodiment, the shear member 204 is a relatively planar surface that conforms to the keel under test to output the shear force of the keel under test during testing. The shear member may be subject to twisting or deformation when the test mechanism applies shear forces, but remain sufficiently stiff to ensure accuracy of the test.

Preferably, the first telescopic cylinder 201 and the second telescopic cylinder 203 are preferably a servo electric cylinder and a hydraulic cylinder, respectively.

Preferably, the shear member 204 is an alloy cone.

In some embodiments of the present application, please refer to fig. 4 in combination: the adjustment mechanism 3 includes a motorized pawl 305; the tested keel is clamped and clamped by the electric clamping claws 305.

In this embodiment, the adjusting mechanism 3 of the device for testing the maximum shearing resistance of the building joist comprises an electric claw 305 which can clamp and clamp the tested joist. The electric claw is a clamping mechanism with a motor, and the clamping mechanism is used for clamping or loosening an object to be clamped through driving of the motor.

Specifically, the electric jaws 305 are used to clamp the tested keel to ensure that the tested keel can be securely fixed to the testing mechanism 2 during testing and to avoid movement of the tested keel interfering with the accuracy of the test results.

In some embodiments of the present application, please refer to fig. 3-4 in combination: the adjusting mechanism 3 comprises a truss 301 horizontally and fixedly connected to the frame 1; the sliding table 302 is in sliding fit with the top of the truss 301 along the horizontal plane, and an electric claw 305 is arranged on the sliding table 302; the linear module is arranged between the truss 301 and the sliding table 302, and outputs a second linear degree of freedom to slide on the sliding table 302.

In this scheme, adjustment mechanism 3 has adopted the structure of truss 301 and slip table 302, and truss 301 level fixed connection is in frame 1, and slip table 302 is along the top of horizontal plane sliding fit in truss 301. The electric claw 305 is installed on the sliding table and can clamp and fix the tested keels. In addition, a linear module is provided between truss 301 and ramp 302 for outputting a second linear degree of freedom. In testing, the adjustment mechanism 3 may be used to control the movement of the linear module so that the orientation of the keel under test may be adjusted.

It should be noted that in this embodiment, the first linear degree of freedom is implemented by the shear member 204 and the second telescopic cylinder 203, and the second linear degree of freedom is implemented by the linear module and the slide table 302 in the adjustment mechanism 3, and the axial directions of the first linear degree of freedom and the second linear degree of freedom are staggered.

In some embodiments of the present application, please refer to fig. 4 in combination: the linear module comprises a power member 303 and a rack and pinion assembly 304 driven by the power member 303; the power member 303 is fixedly connected to the slide table 302.

Preferably, the power member 303 is a servo motor, and an output shaft of the servo motor is fixedly connected with a gear of a gear rack assembly below.

In this embodiment, the linear module includes a power member 303 and a rack and pinion assembly 304 driven by the power member 303. The power piece 303 is fixedly connected to the sliding table 302, and the gear rack assembly 304 is coupled with the power piece 303 through a gear, so that power transmission and linear motion control are realized. When the motor is started, the power piece 303 drives the gear rack assembly 304 to move, so that the sliding table 302 horizontally slides on the truss 301, and a second linear degree of freedom is output for adjusting the orientation of the tested keel. The linear module has higher precision and stability, and can effectively complete the adjustment task.

In the present solution, in one embodiment,

the rack and pinion assembly 304 includes intermeshing gears and racks; the gear is driven to rotate by the power member 303, and the rack is fixedly connected to the truss 301.

In the above embodiment, the rack and pinion assembly 304 is made up of two parts, namely a rack and pinion. The two parts are realized by meshing, the gear is driven to rotate by the power piece 303, and the rack is fixedly connected to the truss 301. When the power member drives the gear to rotate, the meshing action between the gear and the rack causes the rack to move in the direction of truss 301, thereby driving ramp 302 to slide along a horizontal plane, effecting movement in a second linear degree of freedom. The gear rack assembly has the characteristics of simple structure, high reliability and high transmission efficiency.

In the scheme, in order to facilitate the controller to detect the maximum shearing force resistance value of the keel, the method can be realized in a programming mode; wherein, first, a definite calculation formula is needed:

the keel with the rectangular section is made of steel, and has the length L, the width b and the height h. We used a hydraulic cylinder to apply shear force F and performed a shear force test along the width of the keel. Assuming that the acting area of the hydraulic cylinder is A, the pressure applied by the hydraulic cylinder is P, the maximum shearing resistance of the keel is τmax, the shearing area is As, and the elastic modulus is E, the following formula is provided:

shear force formula:

shear force = a x P = 2bh x P

Shear strength formula:

shear strength=τmax/as=fmax/(bh)

Wherein Fmax is the maximum load shear force of the keel.

Maximum load shear force formula:

Fmax＝S×τmax

where S is the keel cross-sectional area and τmax is the maximum shear stress of the material.

Maximum shear stress formula:

τmax＝0.5×F/As

where F is the applied shear force and As is the shear area of the keel.

Shear area formula:

As＝bh

keel elastic modulus formula:

E＝σ/ε

wherein sigma is the stress generated when the keel is stressed, and epsilon is the strain of the keel.

By the above formula, we can calculate the maximum shear resistance of the keel and test and evaluate it. In practical application, proper materials, hydraulic cylinder size, direction and size of applied shearing force and other parameters need to be selected according to practical conditions so as to ensure the accuracy and reliability of the test.

It should be noted that the manner in which the shear area is calculated depends on the shape and geometry of the keel. For example, the shearing area of a rectangular keel can be calculated by b×h, and the shearing area of a circular keel can be calculated by pi×r 2/2.

With the above code, the program thereof can be coded as shown in fig. 6:

first, the procedure requires setting the shear force applied by the hydraulic cylinder, here assumed to be 1000N. The program then requires setting the parameters of the dimensions of the keel, including length, width, height, etc. Here, it is assumed that the length is 2m, the width is 0.1m, and the height is 0.2m. Finally, the procedure also requires setting the keel material parameters, including maximum shear strength and modulus of elasticity.

Next, the procedure requires calculating the shear area and shear strength of the keel based on the size and material parameters of the keel. The shearing area is the sectional area of the keel in the shearing direction when the hydraulic cylinder applies shearing force, and the calculation formula is shearing area = width height. Shear strength refers to the maximum load carrying capacity of the keel in the shear direction, calculated as shear strength = maximum shear strength/shear area, where maximum shear strength is a performance parameter of the keel material.

Finally, the program needs to compare the shearing force applied by the hydraulic cylinder with the maximum shearing force resistance of the keel to determine whether the keel meets the requirements. If the shearing force applied by the hydraulic cylinder is less than or equal to the maximum shearing force of the keel, the keel passes the test, and the program outputs the maximum shearing force of the keel; otherwise, the keel fails the test and the program will also output the maximum shear resistance of the keel. It should be noted here that the unit of the maximum shear resistance of the program output is Pa.

The technical features of the above-described embodiments may be combined in any manner, and for brevity, all of the possible combinations of the technical features of the above-described embodiments may not be described, however, they should be considered as the scope of the present description as long as there is no contradiction between the combinations of the technical features.

Examples

In order to make the above-described embodiments of the present utility model more comprehensible, embodiments accompanied with the present utility model are described in detail by way of example. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, so that the utility model is not limited to the embodiments disclosed below.

The present embodiment is based on the relevant principles described in the above detailed description, where exemplary applications are:

s1, processing a sample from a newly designed nonstandard keel, and placing the sample on an electric claw 305 for clamping;

s2, in the test mechanism 2, the first telescopic cylinder 201 adjusts the general height of the lifting platform 202 in advance so as to adapt to the size and the appearance characteristics of the current keel;

s3, a second telescopic cylinder 203 in the testing mechanism 2 drives a shearing piece 204 to shear outside the keel, and testing of the maximum shearing force of the keel is started. The second telescopic cylinder 203 interacts with the controller through a built-in feedback sensor, and judges the maximum shearing resistance of the keel through program linkage.

S4, after the maximum shear force test of the position of the current keel is finished, the adjusting mechanism 3 continuously adjusts the position of the testing mechanism 2, so that the testing mechanism 2 can test the maximum shear force of different positions of the keel.

The above examples merely illustrate embodiments of the utility model that are specific and detailed for the relevant practical applications, but are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (7)

1. The device for testing the maximum shearing resistance of the building joist is characterized by comprising a frame (1), wherein a testing mechanism (2) is arranged on the frame (1);

the testing mechanism (2) vertically outputs a first linear degree of freedom to the shearing piece (204), and the shearing piece (204) is attached to the tested keel to output shearing force;

the tested keel outputs a second linear degree of freedom carrying adjustment azimuth by the adjustment mechanism (3), and the second linear degree of freedom is staggered with the axial direction of the first linear degree of freedom.

2. The maximum shear test device for a building joist according to claim 1, wherein: the test mechanism (2) comprises a lifting table (202), and a second telescopic cylinder (203) for outputting the first linear degree of freedom is arranged on the lifting table (202);

the piston rod of the second telescopic cylinder (203) is connected with the shearing piece (204).

3. The maximum shear test device for a building joist according to claim 2, wherein: the testing mechanism (2) further comprises a first telescopic cylinder (201);

the first telescopic cylinder (201) is vertically arranged, and a cylinder body and a piston rod of the first telescopic cylinder are respectively connected to the top of the frame (1) and the upper part of the lifting table (202);

the lifting table (202) is vertically matched with the frame (1) in a sliding manner.

4. A device for testing the maximum shearing resistance of a building keel according to any one of claims 1 to 3, wherein: the adjusting mechanism (3) comprises an electric claw (305);

the tested keel is clamped and clamped by the electric clamping jaws (305).

5. The maximum shear test device for a building joist according to claim 4, wherein: the adjusting mechanism (3) comprises a truss (301) horizontally and fixedly connected to the frame (1);

the sliding table (302) is in sliding fit with the top of the truss (301) along the horizontal plane, and the electric clamping jaw (305) is installed on the sliding table (302);

the linear module is arranged between the truss (301) and the sliding table (302), and the linear module outputs the second linear degree of freedom to slide on the sliding table (302).

6. The maximum shear test device for a building joist according to claim 5, wherein: the linear module comprises a power piece (303) and a gear rack assembly (304) driven by the power piece (303);

the power piece (303) is fixedly connected to the sliding table (302).

7. The maximum shear test device for a building joist according to claim 6, wherein: the rack and pinion assembly (304) includes intermeshing gears and racks;

the gear is driven by the power piece (303) to rotate, and the rack is fixedly connected to the truss (301).

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