CN110631829A - Static load test bed for jack - Google Patents
Static load test bed for jack Download PDFInfo
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- CN110631829A CN110631829A CN201911017847.XA CN201911017847A CN110631829A CN 110631829 A CN110631829 A CN 110631829A CN 201911017847 A CN201911017847 A CN 201911017847A CN 110631829 A CN110631829 A CN 110631829A
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- 238000012360 testing method Methods 0.000 title claims abstract description 140
- 230000003068 static effect Effects 0.000 title claims abstract description 43
- 229910000831 Steel Inorganic materials 0.000 claims description 29
- 239000010959 steel Substances 0.000 claims description 29
- 238000009434 installation Methods 0.000 abstract description 9
- 230000008859 change Effects 0.000 abstract description 6
- 230000008093 supporting effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/025—Test-benches with rotational drive means and loading means; Load or drive simulation
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Abstract
The embodiment of the invention discloses a jack static load test bed which comprises an upper cross beam, a lower cross beam, a limiting piece, a vertical pull rod and a force measuring sensor, wherein the test jack and the force measuring sensor are arranged between the upper cross beam and the lower cross beam, the vertical pull rod is connected with the upper cross beam and the lower cross beam and used for bearing the loading force of the test jack, the limiting piece is arranged between the upper cross beam and the lower cross beam, and the bearing capacity of the jack static load test bed can be changed by changing the connection mode of the limiting piece and the cross beams so as to change the stress condition of the limiting piece and change the number of the vertical pull rods. Therefore, the jack static load test bed provided by the embodiment of the invention has the advantages of compact structure, light self weight, convenience in installation and adjustment, clear load transfer path and wide applicability.
Description
Technical Field
The invention relates to the technical field of jack static load tests, in particular to a jack static load test bed.
Background
In static load or dynamic load tests of structural members such as bridges and floor slabs, a jack is often adopted to load the tested structural member so as to test the mechanical property of the structural member. Before the test, the loading capacity of a jack used in the test needs to be tested, and the static load test bed is a device for testing the loading capacity of the test jack. Most of jack static load test beds in the prior art are column type common steel frame structure test beds designed by adopting an internal force self-balancing principle, a poured thick steel plate is adopted as a loading table top to be connected with solid round steel columns, nuts for connecting the round steel columns and the loading table top need to be specially made, the structure is self-heavy, and the disassembly and transportation are inconvenient. In addition, the test bed in the prior art improves the bearing capacity of the test bed by thickening the loading table top and the vertical pull rod, and the cost is high.
Disclosure of Invention
In view of this, an embodiment of the present invention provides a jack static load test bed, which can adjust the bearing capacity of the test bed by adjusting the number of vertical pull rods and changing the pretightening force on a limiting member, so as to have a wider bearing capacity range.
The jack static load test bed of the embodiment of the invention comprises:
the test jack comprises a cross beam, a test jack and a test jack, wherein the cross beam comprises a lower cross beam and an upper cross beam which are arranged in parallel;
at least one limiting member disposed between the lower beam and the upper beam, the limiting member configured to limit a distance between the lower beam and the upper beam;
at least one vertical pull rod, wherein two ends of the vertical pull rod are respectively connected with the lower cross beam and the upper cross beam, and the vertical pull rod is configured to bear the loading force of the test jack; and
a load cell positioned between the test jack and the cross-beam, the load cell configured to detect a loading force value of the test jack;
the bearing capacity of the jack static test bed is configured to be changed by changing the connection mode of the vertical pull rods and the cross beam and the number of the vertical pull rods.
Preferably, the vertical pull rod is arranged on the periphery of the limiting part, and the vertical pull rod is perpendicular to the cross beam.
Preferably, the stopper is perpendicular to the cross member.
Preferably, the resultant centre line of the vertical tie, the axis of the upper cross beam and the axis of the lower cross beam are configured to coincide with the loading centre line of the test jack.
Preferably, two ends of the limiting member are respectively and fixedly connected with the upper cross beam and the lower cross beam, and the limiting member is further configured to bear the loading force of the test jack.
Preferably, the vertical pulling rod is further configured to prestress the stopper.
Preferably, the resultant force centre line of the stop, the resultant force centre line of the vertical tie rod, the axis of the upper cross beam and the axis of the lower cross beam are configured to coincide with the loading centre line of the test jack.
Preferably, the limiting member is movably connected with the upper cross beam and/or the lower cross beam, and the upper cross beam is further configured to move under the driving of the loading force of the test jack.
Preferably, the jack static test bed further comprises:
the positioning piece is fixedly connected with at least one cross beam, the positioning piece is configured to position the limiting piece, and the positioning piece is further configured to move along the limiting piece along with the movement of the upper cross beam.
Preferably, the cross beam is at least one of a box beam, a section steel beam and a casting platform;
the vertical pull rod is at least one of deformed steel bar, steel plate, section steel and steel strand;
the limiting piece is at least one of profile steel and a steel pipe.
The jack static load test bed comprises an upper cross beam, a lower cross beam, a limiting piece, a vertical pull rod and a force measuring sensor, wherein the test jack and the force measuring sensor are arranged between the upper cross beam and the lower cross beam, the vertical pull rod is connected with the upper cross beam and the lower cross beam and used for bearing the loading force of the test jack, the limiting piece is arranged between the upper cross beam and the lower cross beam, and the bearing capacity of the jack static load test bed can be changed by changing the connection mode of the limiting piece and the cross beams so as to change the stress condition of the limiting piece and change the number of the vertical pull rods. Therefore, the jack static load test bed provided by the embodiment of the invention has the advantages of compact structure, light self weight, convenience in installation and adjustment, clear load transfer path and wide applicability.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1 is a schematic perspective view of a static load testing stand of a jack according to an embodiment of the present invention;
FIG. 2 is a front view of a static test bed for a jack according to an embodiment of the present invention;
FIG. 3 is a side view of a static test bed for a jack according to an embodiment of the present invention;
FIG. 4 is a schematic installation diagram of a vertical pull rod, a limiting member and a lower cross beam of the static load test bed of the jack according to the embodiment of the invention;
FIG. 5 is a schematic view of the installation of the lower beam and the positioning member of the static load test bed of the jack according to the embodiment of the present invention;
fig. 6 is a schematic mounting diagram of an upper cross beam of the jack static load test bed of the embodiment of the invention.
Description of reference numerals:
1-a lower cross beam; 2-upper beam; 3-a limiting part; 4-vertical pull rod; 5-a force sensor; 6-test jack; 7-a positioning member; 8-a support leg; 9-mounting holes.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
Unless the context clearly requires otherwise, throughout this specification, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are intended to be inclusive and mean that, for example, they may be fixedly connected or detachably connected or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Spatially relative terms, such as "inner," "outer," "below," "lower," "above," "upper," and the like, are used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Fig. 1-3 are schematic structural views of a jack static load test bed according to an embodiment of the invention. As shown in fig. 1, the jack static test bed of the present embodiment includes a cross beam, a load cell 5, at least one limiting member 3, and at least one vertical pull rod 4. The crossbeam includes parallel arrangement's entablature 2 and bottom end rail 1, and locating part 3 sets up between bottom end rail 1 and entablature 2. Two ends of the vertical pull rod 4 are respectively connected with the lower cross beam 1 and the upper cross beam 2 and are used for bearing the loading force of the test jack 6.
Fig. 4 is an installation schematic diagram of the vertical pull rod, the limiting member and the lower cross beam of the jack static test bed of the embodiment. As shown in fig. 1 to 4, since the vertical pulling rod 4 is configured to receive a pulling force, a stopper 3 is provided for supporting the upper beam 2, limiting a distance between the lower beam 1 and the upper beam 2, and providing a space for placing the test jack 6 and the load cell 5 when the test jack 6 is not provided on the test bed or the test jack 6 is not loaded. The limiting member 3 may be a separate rod member, or may be another structure suitable for serving as a supporting member. When the limiting member 3 is an independent rod member, the limiting member 3 is substantially vertically connected to the cross beam, preferably, the limiting member 3 is perpendicular to the cross beam, so as to obtain a better supporting effect, and the length of the limiting member 3 can be shorter, thereby reducing the overall weight of the test bed. The number of limiting members 3 can be selected by a person skilled in the art according to specific experimental requirements, and preferably the number of limiting members 3 is an even number, for example, two. When the number of the limiting members 3 is an even number, the same number of the limiting members 3 are respectively disposed at both ends of the cross beam, and the arrangement positions of the limiting members 3 are symmetrical, so that the upper cross beam 2 can be stably supported.
When the number of the limiting members 3 is odd, the shape of the cross beam may be set to be a corresponding regular polygon, and each limiting member 3 is correspondingly disposed near an end point of the regular polygon, or an odd number of the limiting members 3 are disposed at the center of the rectangular cross beam, and the remaining limiting members 3 are symmetrically disposed at both ends of the rectangular cross beam, or other arrangement modes capable of supporting the limiting members 3 of the upper cross beam 2 in a balanced manner are adopted.
The vertical tie rods 4 are substantially perpendicular to the lower and upper cross beams 1, 2, and the vertical tie rods 4 may be arranged around the circumference of the limiting member 3 or symmetrically at both ends of the cross beams, or at other positions suitable for providing sufficient reaction force to the test jack 6 during the test.
The vertical pull rod 4 can be one or a combination of a plurality of types of finish-rolled deformed steel bars, steel plates, section steel and steel strands. In this embodiment, the finish rolling deformed steel bar is selected for use by the vertical pull rod 4, has higher strength, and can be connected with the connector with the corresponding internal thread at will, and the connection structure does not need to be additionally processed, so that the connection with the cross beam is facilitated.
The cross beam can be one or a combination of box girder, section steel beam and casting platform. In this embodiment, the cross beam is a steel box girder, which has good overall stress performance and light dead weight and is suitable for bearing the loading force of the test jack 6.
The lower crossbeam 1 is placed on the ground or the surface of other stable test bed carriers and used as a structure for supporting the test bed and the test jack 6, the upper crossbeam 2 is positioned right above the lower crossbeam 1 and is basically parallel to the lower crossbeam 1, the test jack 6 and the force transducer 5 are placed between the upper crossbeam 2 and the lower crossbeam 1, and the upper crossbeam 2 is combined with the vertical pull rod 4 and used for applying a reaction force to the test jack 6 in the loading process of the test jack 6. The force measuring sensor 5 can be placed on the upper surface of the lower cross beam 1, the test jack 6 is placed on the force measuring sensor 5, and the upper part of the test jack 6 is in contact with the lower surface of the upper cross beam 2; it is also possible to place the test jack 6 on the upper surface of the lower beam 1 and place the load cell 5 on the test jack 6 with the other end of the load cell 5 in contact with the lower surface of the upper beam 2. The load cell 5 of this embodiment is disposed below the test jack 6. The type of load cell 5 can be selected according to the requirements of the test load.
Fig. 5 is an installation schematic diagram of a lower cross beam and a positioning member of the jack static test bed of the embodiment, and fig. 6 is an installation schematic diagram of an upper cross beam of the jack static test bed of the embodiment.
As shown in fig. 4-6, in order to facilitate the installation and positioning of the vertical tie 4, the upper cross member 2 and the lower cross member 1 may be provided with mounting holes 9 for allowing the vertical tie 4 to pass through, and then the vertical tie 4 is connected with the upper cross member 2 and the lower cross member 1 by bolts. Alternatively, the vertical tie 4 is fixed by screwing with nuts at the upper surface of the upper beam 2 and at the lower surface of the lower beam 1. After the vertical pull rod 4 is connected with the cross beam, the upper cross beam 2 and the lower cross beam 1 are limited to move back to back without supporting the upper cross beam 2, namely, the vertical pull rod 4 does not limit the upper cross beam 2 and the lower cross beam 1 to move oppositely, and the limiting part 3 limits the upper cross beam 2 and the lower cross beam 1 to move oppositely. The positions of the mounting holes 9 of the upper cross beam 2 and the lower cross beam 1 are corresponding, so that the vertical pull rod 4 can be basically kept in a vertical state with the cross beams after being mounted, and the vertical pull rod 4 is prevented from being inclined to contact with the edges of the mounting holes 9 during the test to generate large shearing force so as to damage the vertical pull rod 4, thereby endangering the test safety.
As shown in fig. 5-6, to facilitate the positioning of the limit stop 3, the test stand further comprises a positioning element 7. Two sets of positioning pieces 7 are respectively fixed at the corresponding positions of the lower surface of the upper cross beam 2 and the upper surface of the lower cross beam 1. The shape and size of the positioning member 7 and the positioning member 3 are matched, so that the positioning member 3 can only move up and down along the positioning member 7, and the movement along the plane direction of the beam cannot occur.
The limiting member 3 may be one or a combination of several kinds of section steel and steel pipe. In this embodiment, the limiting member 3 is a circular steel tube, which is evenly stressed and is convenient to be used in cooperation with the positioning member 7 for positioning. The positioning member 7 may be configured as a spline shaft-like member, and the circular steel pipe may be sleeved outside the positioning member 7 and moved up and down along the positioning member 7. The positioning element 7 may be provided in other shapes suitable for positioning with the limiting element 3, such as a cylinder shape.
The two ends of the limiting member 3 are provided with connecting members for fixedly connecting with the upper cross beam 2 and/or the lower cross beam 1, and the specific connecting mode can be bolt connection, pin connection or other connecting modes. The person skilled in the art can set up the connected mode of locating part 3 and crossbeam according to the concrete needs of experimental load so that the bearing capacity of test bench can satisfy experimental needs.
Specifically, when the test load is small, the limiting part 3 and the lower beam 1 can be fixedly connected to enable the upper beam 2 and the limiting part 3 to be movably connected, that is, when the test jack 6 is loaded, the upper beam 2 can move up and down along the limiting part 3 through the positioning part 7, and the loading force of the test jack 6 is actually borne by the vertical pull rod 4. The transmission path of the test load is: the test jack 6, the upper cross beam 2, the vertical pull rod 4, the lower cross beam 1, the force transducer 5 and the test jack 6 realize the self-balance of the internal force of the system consisting of the test jack 6 and the test bed. During testing, the resultant force central line of the vertical pull rod 4, the axial line of the upper cross beam 2 and the axial line of the lower cross beam 1 are coincided with the loading central line of the test jack 6, so that the stress of the test bed is balanced, and the test bed is prevented from being damaged due to overlarge local stress. Of course, the limiting member 3 may also be fixedly connected to the upper beam 2 and movably connected to the lower beam 1, or the limiting member 3 may be movably connected to both the upper beam 2 and the lower beam 1. Preferably, the limiting member 3 is fixedly connected with the lower beam 1, so that the upper beam 2 is movably connected with the limiting member 3, and the limiting member 3 can be more stable.
When the test load is large, a mode that the positioning piece 7 is fixedly connected with the upper cross beam 2 and the lower cross beam 1 can be adopted, namely the upper cross beam 2, the lower cross beam 1 and the limiting piece 3 are connected with each other to form a rigid structure. At the same time, the limiting element 3 can be prestressed by screwing the nut which fixes the vertical tension rod 4. Therefore, during testing, the loading force of the testing jack 6 is actually borne by the limiting part 3 and the vertical pull rod 4 together, and the bearing capacity of the static load test bed of the jack can be effectively improved. The transmission path of the test load is: the test jack 6, the upper cross beam 2, the vertical pull rod 4, the limiting piece 3, the lower cross beam 1, the force measuring sensor 5 and the test jack 6 realize the self-balance of the internal force of a system consisting of the test jack 6 and a test bed. During testing, the resultant central line of the limiting part 3, the resultant central line of the vertical pull rod 4, the axis of the upper cross beam 2 and the axis of the lower cross beam 1 are coincided with the loading central line of the testing jack 6, so that the stress of the test bed is balanced, and the test bed is prevented from being damaged due to overlarge local stress.
Preferably, the cross beam can be provided with a large number of mounting holes 9, and when the test load is large, the bearing capacity of the test bed can be improved by adding the vertical pull rod 4 connected with the cross beam.
Preferably, the test bench still includes landing leg 8, and the one end of landing leg 8 can be connected with locating part 3 and/or lower beam 1 fixed connection, and the other end is connected with ground, other test bench carriers or other fixed objects to supplementary lower beam 1 supports the test bench, promotes the stability of test bench, prevents that the test bench from toppling over from the thickness direction of the test bench frame that crossbeam and locating part 3 constitute. As shown in fig. 1-3, the legs 8 may comprise diagonal bars inclined to the ground and the plane of the test stand frame, and cross bars parallel to the ground. The horizontal pole is placed on subaerial, and one end is connected with bottom end rail 1, and the other end and down tube fixed connection, the other end and the 3 fixed connection of locating part of down tube, if locating part 3 is swing joint with bottom end rail 1, then the other end of down tube can with 1 fixed connection of bottom end rail. Therefore, the supporting legs 8 and the test bed frame form a right-angled triangle structure, and the stability is high. Preferably, the support legs 8 can be symmetrically arranged on two sides of the plane of the test bed frame, and the support legs 8 can be fixedly connected with the ground through foundation bolts and the like so as to further improve the stability of the test bed.
The jack static load test bed comprises an upper cross beam, a lower cross beam, a limiting piece, a vertical pull rod and a force measuring sensor, wherein the test jack and the force measuring sensor are arranged between the upper cross beam and the lower cross beam, the vertical pull rod is connected with the upper cross beam and the lower cross beam and used for bearing the loading force of the test jack, the limiting piece is arranged between the upper cross beam and the lower cross beam, and the bearing capacity of the jack static load test bed can be changed by changing the connection mode of the limiting piece and the cross beams so as to change the stress condition of the limiting piece and change the number of the vertical pull rods. Therefore, the jack static load test bed provided by the embodiment of the invention has the advantages of compact structure, light self weight, convenience in installation and adjustment, clear load transfer path and wide applicability.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A jack static test platform which is characterized by comprising:
the test jack comprises a cross beam, a test jack and a test jack, wherein the cross beam comprises a lower cross beam and an upper cross beam which are arranged in parallel;
at least one limiting member disposed between the lower beam and the upper beam, the limiting member configured to limit a distance between the lower beam and the upper beam;
at least one vertical pull rod, wherein two ends of the vertical pull rod are respectively connected with the lower cross beam and the upper cross beam, and the vertical pull rod is configured to bear the loading force of the test jack; and
a load cell positioned between the test jack and the cross-beam, the load cell configured to detect a loading force value of the test jack;
the bearing capacity of the jack static test bed is configured to be changed by changing the connection mode of the vertical pull rods and the cross beam and the number of the vertical pull rods.
2. The jack static test bed according to claim 1, wherein the vertical pull rod is arranged on the periphery of the limiting member, and the vertical pull rod is perpendicular to the cross beam.
3. The jack static test bed according to claim 2, wherein the limiting member is perpendicular to the cross beam.
4. A jack static test rig according to claim 1, wherein the resultant centre line of the vertical tie, the axis of the upper beam and the axis of the lower beam are arranged to coincide with the loading centre line of the test jack.
5. The jack static test bed according to claim 1, wherein two ends of the limiting member are respectively and fixedly connected with the upper cross beam and the lower cross beam, and the limiting member is further configured to bear the loading force of the test jack.
6. The jack static test rig of claim 5, wherein the vertical tie is further configured to prestress the stop.
7. The jack static test stand of claim 6, wherein a resultant force centerline of the limiter, a resultant force centerline of the vertical tie rod, an axis of the upper beam, and an axis of the lower beam are configured to coincide with a loading centerline of the test jack.
8. The jack static test stand of claim 1, wherein the stop is movably connected to the upper beam and/or the lower beam, the upper beam further configured to move under the loading force of the test jack.
9. The jack static test stand of claim 8, further comprising:
the positioning piece is fixedly connected with at least one cross beam, the positioning piece is configured to position the limiting piece, and the positioning piece is further configured to move along the limiting piece along with the movement of the upper cross beam.
10. The jack static test stand of claim 1, wherein the cross beam is at least one of a box beam, a section steel beam and a cast platform;
the vertical pull rod is at least one of deformed steel bar, steel plate, section steel and steel strand;
the limiting piece is at least one of profile steel and a steel pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911017847.XA CN110631829A (en) | 2019-10-24 | 2019-10-24 | Static load test bed for jack |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911017847.XA CN110631829A (en) | 2019-10-24 | 2019-10-24 | Static load test bed for jack |
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| CN110631829A true CN110631829A (en) | 2019-12-31 |
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| CN201911017847.XA Pending CN110631829A (en) | 2019-10-24 | 2019-10-24 | Static load test bed for jack |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112763199A (en) * | 2020-12-28 | 2021-05-07 | 大连长丰实业总公司 | Aircraft jack test bench |
| CN117213824A (en) * | 2023-10-11 | 2023-12-12 | 江苏宇力机电设备集团有限公司 | Jack performance test equipment |
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