CN114088529B - Longitudinal bending load and transverse pulling/ballasting load coupling loading method - Google Patents
Longitudinal bending load and transverse pulling/ballasting load coupling loading method Download PDFInfo
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- CN114088529B CN114088529B CN202111418107.4A CN202111418107A CN114088529B CN 114088529 B CN114088529 B CN 114088529B CN 202111418107 A CN202111418107 A CN 202111418107A CN 114088529 B CN114088529 B CN 114088529B
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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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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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
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
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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
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
Abstract
The invention provides a longitudinal bending load and transverse pulling/loading load coupling loading method, which comprises the following steps: applying a longitudinal bending load to the center of the test piece by adopting a jacking mechanism, and simultaneously applying a transverse tensile load or a transverse compressive load to the test piece; when the test piece is lengthened or pressed to a preset value, the jacking mechanism and/or the clamping seat are rapidly moved to a designated position, so that the jacking rod assembly of the jacking mechanism is opposite to the center of the test piece; repeating the above steps one or more times until the test is finished. The invention can always ensure that the longitudinal bending load applying point is positioned in the middle area of the test piece, and carry out regular stress test according to the actual stress state of the test piece, can efficiently, precisely, stably and flexibly control the strain concentration area, can continuously carry out the cooperative/coupling loading of the longitudinal bending load and the transverse pulling/pressing load in an outdoor environment, particularly in a severe environment for a long time, and is particularly suitable for evaluating the evolution of the environmental damage performance of engineering plastic components.
Description
Technical Field
The invention belongs to the technical field of mechanical tests, and particularly relates to a longitudinal bending load and transverse pulling/ballasting load coupling loading method.
Background
To achieve a particular function or performance, the load bearing members tend to be relatively complex in construction. Under the use environment condition, the bearing components are subjected to the effects of various complex service working condition loads to different degrees in the processes of assembly, storage, transportation and use. Under the action of environment-stress coupling, various performances of the composite material can be changed, faults are easy to occur, and the damage forms are various. Aiming at the most common bearing component (such as a curved bearing component) for bearing tension/compression load and bending load in engineering practice, the development of the coupling loading test method has strong practical significance for regularly simulating the actual stress state of the bearing component.
In the prior art, document CN2758743 discloses a plate-shaped curvature rod, two ends of the curvature rod are straight rods, and the middle of the curvature rod is of a bending structure, and in the experimental process, on an electronic universal testing machine, eccentric stretching or compression experiments are performed on samples with different curvature radiuses according to a simple stretching experimental method. However, with this solution, the test piece must be made to be the most specific curved structure in advance, which is obviously cumbersome to implement, difficult and subject to great limitations.
In addition, document CN2021106648412 discloses a comprehensive testing device for internal pressure, stretching, torsion and bending load of a flexible composite pipeline, which comprises an upper base station, a lower base station and a hydraulic cylinder stand column, wherein a cylinder barrel and a cylinder rod of the hydraulic cylinder stand column are respectively and fixedly connected to the upper base station and the lower base station, an internal pressure loading assembly is arranged on the upper base station, a rotary chassis and a hydraulic driving assembly are arranged on the lower base station, bending load loading is carried out through the hydraulic cylinder and a coupling, the hydraulic cylinder changes displacement through expansion and contraction, so that the force is changed, and the direction of force is changed through the coupling, and the force and direction transmission are carried out by connecting a sealing joint flange at the bottom end of the flexible composite pipeline through a lower flange connector, so that bending moment is applied to the flexible composite pipeline. However, this device is only suitable for flexible pipes, and the irregular bending phenomenon of the test piece can occur after the bending load is applied, the strain concentration area is uncontrollable, and the device cannot be continuously used in an outdoor environment for a long time.
Disclosure of Invention
The invention aims to provide a longitudinal bending load and transverse pulling/pressing load coupling loading method which can not only perform regular stress test according to the actual stress state of a test piece, but also flexibly control a strain concentration area, and can also continuously perform collaborative loading of the longitudinal bending load and the transverse pulling/pressing load in an outdoor environment for a long time.
In order to achieve the above object, the present invention adopts the following technical scheme.
A method of loading a longitudinal bending load coupled with a transverse pull/ballast load, comprising the steps of:
step 1, applying a longitudinal bending load to the center of a test piece by adopting a jacking mechanism, and simultaneously applying a transverse tensile load or a transverse compressive load to the test piece;
step 2, after the test piece is lengthened or pressed to a preset value, rapidly moving the jacking mechanism and/or the clamping seat to a designated position, so that a jacking rod component of the jacking mechanism is opposite to the center of the test piece; the clamping seat is used for clamping the test piece; as a preferable scheme: the clamping seat and the jacking mechanism are simultaneously connected, and two groups of elastic pieces with the same specification are symmetrically arranged to pull the jacking mechanism to a designated position, or the clamping seat is automatically pulled to the designated position by adopting a creep automatic compensation system connected to the clamping seat; in the invention, two, four or six elastic pieces connected to the same side of the pressing mechanism are called a group of elastic pieces, and the symmetrical arrangement means that the two groups of elastic pieces are symmetrically arranged around the pressing mechanism;
and 3, repeating the step 1-2 one or more times until the test is finished.
In order to continuously and stably apply bending fatigue stress loading to a sample, the pressing mechanism includes: the middle point between the two clamping seats and the center of the jacking mechanism support are positioned on the same vertical line; a jacking rod assembly is vertically arranged on the jacking mechanism support, the upper end of the jacking rod assembly is used for jacking a test piece, and a crank mechanism below the jacking rod assembly is connected with a motor; the crank mechanism comprises a cam connected to the output shaft of the motor, the cam is matched with the movable shaft, and the movable shaft and the top pressure rod assembly are driven to reciprocate up and down when the cam rotates.
In order to improve stability during the test, the pressing mechanism further includes: the guide sleeve is vertically penetrated and fixed on the support of the pressing mechanism, a movable shaft is axially arranged in the guide sleeve, the upper end of the movable shaft abuts against the pressing rod assembly, the lower end of the movable shaft is matched with the cam, the earpins symmetrically arranged on the movable shaft are radially penetrated in the strip-shaped holes of the guide sleeve, one part of the pressing rod assembly is precisely matched in the guide sleeve, and the other part of the pressing rod assembly extends upwards.
In order to be convenient for accurate regulation and apply the not cylinder of equidimension bending stress, the roof pressure pole subassembly is provided with the screw including taking the cap edge in cap edge middle part, axial, screw-thread fit have the ejector pin in the screw, and the ejector pin top is used for the roof pressure test piece, overlaps on the cylinder and is equipped with the second spring, and second spring upper end supports and leans on cap edge, lower extreme and supports and lean on the loose axle.
In order to enable the test piece to have a regular bending phenomenon, the strain concentration area is conveniently and accurately controlled, the support of the jacking mechanism is slidably matched with or fixed on the horizontal guide rail, and two sets of elastic pieces with the same specification which are symmetrically arranged on the support of the jacking mechanism are respectively connected with the clamping seat. By adopting the structure, the longitudinal bending load applying point can be rapidly ensured to be positioned at the middle part of the test piece.
In order to be able to control the strain concentration area more precisely and stably, two clamping holders are in sliding fit on the horizontal guide rail, wherein one clamping holder B is connected with a pulling/ballasting loading system through a horizontally arranged lever, and the other clamping holder A is connected with a creep automatic compensation system which is used for pulling back the clamping holder A to a designated position. As a preferable scheme, the creep automatic compensation system comprises a ball screw fixedly connected to a clamping seat A, a nut seat with a first helical tooth is matched on the ball screw, and the first helical tooth is meshed with a helical tooth at the output end of a servo motor; or, the ball screw is matched with a nut seat, the nut seat is fixedly sleeved with a first helical tooth, and the first helical tooth is meshed with a helical tooth at the output end of the servo motor; when the servo motor operates, the bevel gear II is driven to rotate, so that the nut seat is driven to rotate, and the ball screw is driven to move so as to pull the clamping seat A back.
In order to be able to control the strain concentration area efficiently, in real time, accurately, stably and flexibly, a sensor A and a sensor B are arranged right below the lever, and the sensor A, the sensor B, a servo motor and a pull/press load loading system are respectively connected with a control system, wherein the control system comprises a memory, a processor and a program which is stored on the memory and can run on the processor, and the processor realizes the following steps/functions when executing the program: when the sensor A detects that the lever deflects by a preset angle, immediately starting a servo motor of the creep automatic compensation system to run, pulling the clamping seat A back to a preset position, and then controlling the servo motor to be closed; when the sensor B detects that the lever deflects by a preset angle II, the pull/ballast loading system is immediately closed.
As a preferable scheme, the ejector rod is a single-head screw rod; or, the ejector rod is provided with a cylindrical part, the top end of the cylindrical part is connected with a U-shaped part or a V-shaped part, and the U-shaped part or the V-shaped part is integrally connected with the top end of the cylindrical part. With this structure, the specimen can be prevented from being longitudinally displaced.
The beneficial effects are that: by adopting the scheme of the invention, the longitudinal bending load application point is always ensured to be positioned in the middle area of the test piece under the unattended condition, the regular stress test is carried out according to the actual stress state of the test piece, the strain concentration area can be efficiently, precisely, stably and flexibly controlled, the cooperative/coupling loading of the longitudinal bending load and the transverse pulling/pressing load can be continuously carried out in an outdoor environment (for months or even years) particularly in a severe environment (such as coastal areas and alpine areas) for a long time, and the method is particularly suitable for researching and evaluating the environmental damage performance evolution of engineering plastic components; by adopting the scheme of the invention, the bending stress and the pulling/pressing stress of high frequency and large load can be stably applied to the test piece (especially the rod piece, the plate piece and the cylindrical piece in the creep state), and when the bending loading frequency is 1-5HZ, the bending stress load can reach more than 375 kg.
Drawings
FIG. 1 is a partial schematic view of an apparatus for applying a longitudinal bending load and a tensile load to a test piece in an embodiment;
FIG. 2 is a schematic diagram of a portion of an embodiment creep automatic compensation system;
FIG. 3 is a schematic view of the jacking mechanism (pitch-up) in an embodiment;
FIG. 4 is a schematic partial perspective view of a pressing mechanism in one embodiment;
FIG. 5 is a schematic partial perspective view of a pressing mechanism according to a second embodiment;
FIG. 6 is an exploded view of a jack rod assembly of the jack mechanism of the embodiment;
FIG. 7 is a schematic illustration of a ram pressing mechanism according to an embodiment;
fig. 8 is a schematic diagram of a ram of the pressing mechanism in the second embodiment.
Detailed Description
The following examples are provided only to aid in understanding the principles of the present invention and its core ideas and are not intended to limit the scope of the present invention. It should be noted that modifications to the present invention without departing from the principles of the invention would be obvious to one of ordinary skill in this art and would fall within the scope of the invention as defined in the appended claims.
Examples
The apparatus for applying the coupling loading of the longitudinal bending load and the transverse pulling/compressive load will be described. As shown in fig. 1 to 6, the apparatus includes a stage, a pressing mechanism 300 provided on the stage for applying a longitudinal bending load to a test piece, a pull/press loading system 100 for applying a lateral tensile load or a lateral compressive load to the test piece; two parallel horizontal guide rails 41 are arranged on the rack, two clamping seats are in sliding fit on the horizontal guide rails 41, one clamping seat B102 is connected with the pulling/ballasting load loading system 100 through a horizontally arranged lever 21, the other clamping seat A101 is connected with the creep automatic compensation system 200, and the creep automatic compensation system 200 is used for pulling the clamping seat A101 back to a designated position.
Wherein, the pressing mechanism 300 includes: the jacking mechanism support 40 is arranged between the two clamping seats, the jacking mechanism support 40 is slidably matched on the horizontal guide rail rod 53, and the middle point between the two clamping seats and the center of the jacking mechanism support 40 are positioned on the same vertical line; a jacking rod assembly 43 is vertically arranged on the jacking mechanism support 40, the upper end of the jacking rod assembly 43 is used for jacking the test piece 11, and a crank mechanism below the jacking rod assembly 43 is connected with a motor 44; the crank mechanism comprises a cam 45 connected to the output shaft of the motor 44, the cam 45 is matched with a movable shaft 48, and the movable shaft 48 and the pressing rod assembly 43 are driven to reciprocate up and down when the cam 45 rotates. The pressing mechanism further includes: the guide sleeve 47 vertically penetrates through and is fixed on the support 40 of the pressing mechanism, the movable shaft 48 is axially arranged in the guide sleeve 47, the upper end of the movable shaft 48 abuts against the pressing rod assembly 43, the lower end of the movable shaft 48 is matched with the cam 45, the symmetrically arranged ear pins 49 on the movable shaft 48 radially penetrate through the strip-shaped holes 50 of the guide sleeve 47, one part of the pressing rod assembly 43 is precisely matched in the guide sleeve 47, and the other part of the pressing rod assembly extends upwards.
Wherein, more specifically: as shown in fig. 6, the pressing rod assembly 43 includes a cylinder 432 with a cap edge 431, a screw hole 433 is provided in the middle of the cap edge 431, a pressing rod 434 is axially and threadedly engaged in the screw hole 433, the pressing rod 434 adopts a single-head hexagonal screw, the top end of the pressing rod 434 is used for pressing the test piece 11, a second spring 435 is sleeved on the cylinder 432, and the upper end of the second spring 435 abuts against the cap edge 431, and the lower end abuts against the movable shaft 48. With this structure, not only is it convenient to precisely adjust the application of different amounts of bending stress, but also different fatigue bending stresses can be applied by replacing the second springs 435 of different specifications. Two sets of elastic pieces with the same specification which are symmetrically arranged on the jacking mechanism support 40 are respectively connected with the clamping seat, the elastic pieces adopt springs, one end of each elastic piece is connected with the side wall of the jacking mechanism support 40, and the other end is connected with the side wall of the clamping seat; more preferably, the elastic member is made of rubber band.
As shown in fig. 2, the creep automatic compensation system 200 includes a ball screw 61 fixedly connected to the clamping seat a101, a nut seat 63 with a first helical tooth 62 is matched on the ball screw 61, and the first helical tooth 62 is meshed with a second helical tooth 64 at the output end of the servo motor 60; or, a nut seat 63 is matched with the ball screw 61, a first helical tooth 62 is fixedly sleeved on the nut seat 63, and the first helical tooth 62 is meshed with a second helical tooth 64 at the output end of the servo motor 60; when the servo motor 60 operates, the helical gear two 64 is driven to rotate, so as to drive the nut seat 63 to rotate, and further drive the ball screw 61 to move, so as to pull back the clamping seat A101. With such a structure, it is possible to realize: when the servo motor 60 is turned off, the clamping seat A101 is in a fixed state; when the servo motor 60 is turned on, the clamping seat a101 is in an active state.
A sensor a and a sensor B are arranged right below the lever 21, the sensor a, the sensor B, the servo motor 60 and the pull/press loading system are respectively connected with a control system, the control system comprises a memory, a processor and a program which is stored on the memory and can run on the processor, and the processor realizes the following steps/functions when executing the program: when the sensor A detects that the lever 21 deflects by a preset angle, the servo motor 60 of the creep automatic compensation system 200 is started to operate immediately, the clamping seat A101 is pulled back to a preset position, the clamping seat B102 moves synchronously along with the clamping seat A101 at the moment, and then the servo motor 60 is controlled to be closed; when sensor B detects that lever 21 is deflected by a preset angle two, the pull/ballast loading system 100 is immediately turned off.
A method of coupling a longitudinal bending load with a transverse pull/ballast load, the method employing the apparatus of this embodiment, the steps comprising:
step 1, applying a longitudinal bending load to the center of a test piece by adopting a jacking mechanism 300, and simultaneously applying a transverse tensile load or a transverse compressive load to the test piece;
step 2, after the test piece is lengthened or pressed to a preset value, rapidly moving the jacking mechanism 300 and the clamping seat to a specified position, automatically pulling the clamping seat to the specified position through a creep automatic compensation system connected to the clamping seat, and simultaneously pulling the jacking mechanism to the specified position by means of two groups of elastic pieces with the same specification, so that a jacking rod component of the jacking mechanism 300 is opposite to the center of the test piece;
and 3, repeating the step 1-2 one or more times until the test is finished.
The process of applying load to the center of the test piece: the motor 44 drives the cam 45 to rotate when running, the movable shaft 48 is driven to reciprocate up and down when the cam 45 rotates, the pressing rod assembly 43 reciprocates up and down along with the movable shaft 48, the pressing rod assembly 43 longitudinally presses the test piece to apply a longitudinal load to bend the test piece when moving up, and the test piece is reset when the pressing rod assembly 43 moves down, so that the continuous operation is carried out to continuously apply a bending load to the test piece; and when bending load is applied, a tension/compression load loading system is adopted to apply transverse tension load or transverse compression load to the test piece, and the two loads are applied simultaneously, so that the coupling loading of the longitudinal bending load and the transverse tension/compression load of the test piece is realized.
Because the test piece will creep and gradually lengthen under the action of the transverse tension load, the clamping seat B102 will also adaptively displace along with the test piece, which requires moving the pressing mechanism and/or moving the clamping seat to adjust the application point of the longitudinal load. In this embodiment, the sensor a disposed directly below the lever 21 is used to monitor the deflection of the lever 21, and once the lever 21 deflects to a preset angle, it indicates that the test piece is elongated to a certain extent, the middle part of the test piece deviates from the longitudinal load application area, then the servo motor 60 of the creep automatic compensation system is immediately started to operate, and the clamping seat a101 is pulled back to a preset position, so that the middle part of the test piece returns to the longitudinal load application area again, and then the servo motor 60 is controlled to be turned off; as the specimen continues to elongate, when sensor B detects the deflection of lever 21 by a preset angle two, indicating that the specimen is being pulled apart, the pull/ballast loading system is immediately turned off. In this embodiment, two sets of elastic members (springs) with the same specification symmetrically arranged on the support 40 of the pressing mechanism can play a role in automatic centering, and the stretching or shortening amount can be automatically adjusted through the elastic members after the clamping seat a101 or the clamping seat B102 moves, so that the pressing mechanism is always positioned at the central position between the clamping seat a101 and the clamping seat B102, and the pressing member is further ensured to be opposite to the center of the test piece.
In other embodiments, the support 40 of the pressing mechanism may be fixed on the horizontal guide rail 53, and the clamping seat is directly pulled back to half of the elongation of the test piece through the creep automatic compensation system, for example, when the elongation of the test piece (engineering plastic rod) is Nmm, the center of the elongated test piece is shifted by N/2mm relative to the center of the test piece in the initial state, and at this time, the clamping seat B102 needs to be pulled back by N/2mm, and the clamping seat a101 is correspondingly pulled back by N/2mm.
In other embodiments, the ejector rod 434 may also have a structure that (1) as shown in fig. 7, the ejector rod 434 has a cylindrical portion 51, the top end of the cylindrical portion 51 is connected to a U-shaped portion 52, and when a longitudinal bending load is applied, a test piece passes through a U-shaped groove of the U-shaped portion 52; (2) As shown in fig. 8, the jack 434 has a cylindrical portion 51, and the tip of the cylindrical portion 51 is connected to a V-shaped portion 54, and when a longitudinal bending load is applied, a test piece is passed through the V-shaped groove of the V-shaped portion 54.
By adopting the scheme in the embodiment, the longitudinal bending load applying point can be always ensured to be positioned in the middle area of the test piece under the unattended condition, the regular stress test can be carried out according to the actual stress state of the test piece, the strain concentration area can be efficiently, precisely, stably and flexibly controlled, the cooperative/coupling loading of the longitudinal bending load and the transverse pulling/pressing load can be continuously carried out in the outdoor environment (months or even years) particularly in the severe environment (such as coastal areas and alpine areas) for a long time, and the method is particularly suitable for researching and evaluating the environment damage performance evolution of engineering plastic components; by adopting the scheme in the embodiment, the bending stress and the pulling/pressing stress of high frequency and large load can be stably applied to the test piece (particularly the rod piece, the plate piece and the cylindrical piece in the creep state), and when the bending loading frequency is 1-5HZ, the bending stress load can reach more than 375 kg.
Claims (4)
1. A method of coupling a longitudinal bending load with a transverse pull/ballast load, comprising the steps of: step 1, applying a longitudinal bending load to the center of a test piece by adopting a jacking mechanism, and simultaneously applying a transverse tensile load or a transverse compressive load to the test piece; step 2, after the test piece is lengthened or pressed to a preset value, rapidly moving the jacking mechanism and/or the clamping seat to a designated position, so that a jacking rod component of the jacking mechanism is opposite to the center of the test piece; the clamping seat is used for clamping the test piece; step 3, repeating the step 1-2 one or more times until the test is finished;
the pressing mechanism includes: the jacking mechanism support (40) is arranged between the two clamping seats, and the middle point between the two clamping seats and the center of the jacking mechanism support (40) are positioned on the same vertical line; a jacking rod assembly (43) is vertically arranged on the jacking mechanism support (40), the upper end of the jacking rod assembly (43) is used for jacking the test piece (11), and a crank mechanism below the jacking rod assembly (43) is connected with a motor (44); the crank mechanism comprises a cam (45) connected to the output shaft of the motor (44), the cam (45) is matched with the movable shaft (48), and the movable shaft (48) and the top pressure rod assembly (43) are driven to reciprocate up and down when the cam (45) rotates;
the pressing mechanism further includes: the guide sleeve (47) is vertically arranged in a penetrating mode and fixed on the jacking mechanism support (40), a movable shaft (48) is axially arranged in the guide sleeve (47), the upper end of the movable shaft (48) abuts against the jacking rod assembly (43), the lower end of the movable shaft (48) is matched with the cam (45), ear pins (49) symmetrically arranged on the movable shaft (48) are radially arranged in strip-shaped holes (50) of the guide sleeve (47) in a penetrating mode, one part of the jacking rod assembly (43) is precisely matched in the guide sleeve (47), and the other part of the jacking rod assembly extends upwards;
the jacking rod assembly (43) comprises a cylinder (432) with a cap edge (431), a screw hole (433) is formed in the middle of the cap edge (431), a jacking rod (434) is axially and in threaded fit with the screw hole (433), the top end of the jacking rod (434) is used for jacking a test piece (11), a second spring (435) is sleeved on the cylinder (432), the upper end of the second spring (435) abuts against the cap edge (431), and the lower end of the second spring abuts against the movable shaft (48);
the jacking mechanism support (40) is slidably matched or fixed on the horizontal guide rail rod (53), two sets of elastic pieces with the same specification symmetrically arranged on the jacking mechanism support (40) are respectively connected with the clamping seat, and the elastic pieces adopt springs or rubber strips;
the two clamping seats are in sliding fit on the horizontal guide rail (41), one clamping seat B (102) is connected with a pulling/ballasting loading system through a lever (21) which is horizontally arranged, the other clamping seat A (101) is connected with a creep automatic compensation system, and the creep automatic compensation system is used for pulling the clamping seat A (101) back to a designated position;
a sensor A and a sensor B are arranged right below the lever (21), the sensor A, the sensor B, a servo motor (60) and a pull/ballast loading system are respectively connected with a control system, the control system comprises a memory, a processor and a program which is stored on the memory and can run on the processor, and the processor realizes the following steps/functions when executing the program: when the sensor A detects that the lever (21) deflects by a preset angle, immediately starting a servo motor (60) of the creep automatic compensation system to operate, pulling the clamping seat A (101) back to a preset position, and then controlling the servo motor (60) to be closed; when the sensor B detects that the lever (21) deflects by a preset angle II, the pull/ballast loading system is immediately turned off.
2. The method according to claim 1, characterized in that: the clamping seat and the jacking mechanism are simultaneously connected, and two groups of elastic pieces with the same specification are symmetrically arranged to pull the jacking mechanism to a designated position, or the clamping seat is automatically pulled to the designated position by adopting a creep automatic compensation system connected to the clamping seat.
3. The method according to claim 1, characterized in that: the creep automatic compensation system comprises a ball screw (61) fixedly connected to a clamping seat A (101), a nut seat (63) with a first helical tooth (62) is matched on the ball screw (61), and the first helical tooth (62) is meshed with a second helical tooth (64) at the output end of a servo motor (60); or, a nut seat (63) is matched with the ball screw (61), a first helical tooth (62) is fixedly sleeved on the nut seat (63), and the first helical tooth (62) is meshed with a second helical tooth (64) at the output end of the servo motor (60); the servo motor (60) drives the helical gear II (64) to rotate during operation, and then drives the nut seat (63) to rotate, and then drives the ball screw (61) to move so as to realize the pulling back of the clamping seat A (101).
4. The method according to claim 1, characterized in that: the ejector rod (434) is a single-head screw rod; or, the ejector rod (434) is provided with a cylindrical part (51), the top end of the cylindrical part (51) is connected with a U-shaped part (52) or a V-shaped part (54), and the U-shaped part (52) or the V-shaped part (54) is integrally connected with the top end of the cylindrical part (51).
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| CN202111418107.4A CN114088529B (en) | 2021-11-25 | 2021-11-25 | Longitudinal bending load and transverse pulling/ballasting load coupling loading method |
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| CN202111418107.4A CN114088529B (en) | 2021-11-25 | 2021-11-25 | Longitudinal bending load and transverse pulling/ballasting load coupling loading method |
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