A portable external cable prestressing detection device

Abstract

The utility model relates to the field of prestress detection of external cables, and specifically to a portable prestress detection device for external cables; it includes a support seat, and a fixing clamp adapted to the external cables is provided at the bottom of the support seat; a detection platform is installed above the support seat, and an LED display screen is provided on the outer side of the detection platform; a pressure loading structure is provided on one side of the detection platform, and the pressure loading structure includes a pressure detection sensor, a loading plate, and a driving member; the pressure detection sensor is provided on the fixing clamp, and the loading plate is movably provided on the detection platform, and the driving member is configured to drive the loading plate to move up and down to complete the operation of applying a preset pressure value to the external cables; the pressure detection sensor maintains a signal connection with the LED display screen; and a deformation test structure is also provided on one side of the detection platform. The utility model adopts an integrated detection structure, which is easy to carry, and adopts automatic detection and digital display readings, which not only greatly improves the efficiency of external cable prestress detection, but also effectively guarantees the accuracy of prestress detection.

Description

Technical Field

[0001] The utility model relates to the field of in vitro cable prestress detection, in particular to a portable in vitro cable prestress detection device. Background Art

[0002] In the study of the effective stress test of the external cable using the transverse tension method, because the test object is a single steel strand, the stiffness of the steel strand itself is not significant when the test gauge length is small, and the steel strand is similar to an ideal cable structure. For the external prestressed bundles with a length of tens of meters in actual engineering, ignoring the influence of the stiffness of the external bundle itself, it is still similar to a cable structure, so the transverse tension method is also applicable. By applying a certain transverse tension to the steel bundle and testing the transverse deformation at key positions, the effective prestress state of the external bundle can be obtained.

[0003] The prior art "CN 205192664 U, a test system for effective prestress of an external cable" records that "the utility model belongs to the general field of metrology technology for measuring stress, and specifically relates to a test system for effective prestress of an external cable, including a beam, an external cable and a displacement measuring device. The two ends of the external cable are respectively provided with anchor ends, and the anchor ends are fixed under the beam. One end of the displacement measuring device is fixed under the beam, and the other end is fixed at the midpoint of the external cable: a temporary fixing device is fixed at the midpoint of the external cable, and a counterweight device is connected to the bottom of the temporary fixing device through a force transmission rod. The test system has a clear principle and is easy to operate. It can quickly and accurately measure the effective prestress of the external cable without affecting the traffic on the bridge."

[0004] However, the above-mentioned in-vitro cable prestress test system of the prior art still has the following disadvantages: First, the structure of the in-vitro cable prestress test system is not perfect. The traditional one adopts a split monomer structure. The pressure loading device and the deformation test device are independent individuals. In the construction test operation, they need to be fixed and debugged one by one, which is time-consuming and labor-intensive, and very inconvenient to carry, which seriously restricts the efficiency of the in-vitro cable prestress test. Second, the in-vitro cable prestress test structure of the prior art is relatively simple, and the use effect is that the pressure loading and deformation displacement detection are all in the form of manual reading and recording, which is not only time-consuming and labor-intensive, but also has a large error effect. Summary of the invention

[0005] In order to solve the above-mentioned shortcomings and deficiencies of the existing technology of extracorporeal cable prestress detection, the utility model provides a portable extracorporeal cable prestress detection device with reasonable structural design, integrated detection structure, easy to carry, automated detection and digital display readings, and improved extracorporeal cable prestress detection efficiency.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a portable external cable prestress detection device, including a support seat, the support seat is distributed on the left and right, and the bottom end is provided with a fixing clamp adapted to the external cable; a detection platform is installed above the support seat, and an LED display screen is provided on the outer side of the detection platform; a pressure loading structure is provided on one side of the detection platform, and the pressure loading structure includes a pressure detection sensor, a loading plate, and a driving member; the pressure detection sensor is arranged on the fixing clamp, the loading plate is movably arranged on the detection platform, and the driving member is configured to drive the loading plate to move up and down to complete the operation of applying a preset pressure value to the external cable; the pressure detection sensor maintains a signal connection with the LED display screen, and in the initial state, the loading plate is kept flush with the top surface of the detection platform; a deformation test structure is also provided on one side of the detection platform, and the deformation test structure includes an electric hydraulic lifting rod and a displacement sensor; the electric hydraulic lifting rod is arranged on the detection platform, and the displacement sensor is arranged at the end of the electric hydraulic lifting rod, and the displacement sensor is electrically connected to the LED display screen.

[0007] As a preferred technical solution: the fastening clamp is a semicircular structure and is connected to a sliding block, a sliding groove is provided on one side of the support seat, and the sliding block is installed in a matching manner with the sliding groove.

[0008] A further preferred technical solution: a fixing bolt is further provided on one side of the slider, so that the fixing clamp is moved to a preset position and then fixed.

[0009] A further preferred technical solution: the driving member includes a base plate, a first connecting rod, a second connecting rod, a connecting arm, a driving rod and a driving motor; a groove is provided on one side of the detection platform, the base plate is arranged at the bottom of the groove, the first connecting rods are four and are symmetrically distributed front to back and left to right, and one end of the first connecting rod is hinged to the base plate and the other end is hinged to the second connecting rod, and one end of the second connecting rod is hinged to the loading plate; the connecting arms are two and are distributed front to back, and each connecting arm is arranged at the hinge point of the first connecting rod and the second connecting rod in a left-right distribution; the driving rod is distributed front to back and is rotatably arranged on the detection platform, the driving rod passes through the two connecting arms and maintains a threaded rotation connection, so that the positive rotation of the driving rod drives the two connecting arms closer to each other; the driving motor is fixedly installed on the detection platform through a bracket, and the output shaft is connected to the driving rod.

[0010] A further preferred technical solution is as follows: a mounting groove is provided on one side of the detection platform, and the electric hydraulic lifting rod is fixedly installed in the mounting groove; a cover plate is also hinged on one side of the mounting groove; in an initial state, the electric hydraulic lifting rod is retracted and the displacement sensor is in the mounting groove.

[0011] A further preferred technical solution is that a handle is also provided on the upper end surface of the detection platform.

[0012] Compared with the prior art, the utility model has the following beneficial effects: the detection device has a reasonable structural design, and by setting the pressure detection sensor, the loading plate, and the driving member, and by the deformation detection of the electric hydraulic lifting rod and the displacement sensor, a free telescopic storage method is adopted. When the detection device is not in use, the driving member drives the loading plate to shrink, so that the loading plate is flush with the detection platform, which not only ensures the flatness and regularity of the detection device, but also provides the function of being easy to carry; the method of using the shear lifting structure to complete the pressurization is more stable, the pressurization load range is large, the practicality is stronger, and the integrated integrated detection structure is easy to carry; further, the LED display screen, the pressure detection sensor, and the displacement sensor are used in combination to realize efficient and rapid automatic detection and intuitive digital display readings, which not only greatly improves the efficiency of the prestress detection of the in vitro cable, but also effectively ensures the accuracy of the prestress detection; the detection device has high integration and portability, is suitable for different types of in vitro cable stress tests, is powered by batteries, is also convenient for field operations, has high test efficiency, and is highly feasible. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 It is a three-dimensional diagram of the overall structure of the utility model;

[0015] Figure 2 A three-dimensional diagram of the support base of the utility model;

[0016] Figure 3 It is a cross-sectional view of the overall structure of the utility model;

[0017] Figure 4 It is a structural stereogram of the driving member of the utility model;

[0018] Figure 5 This is a schematic diagram showing the application of the utility model in a prestressed pressure detection site.

[0019] In the figure: 1. support seat; 2. fastening clamp; 3. detection platform; 4. LED display screen; 5. pressure loading structure; 51. pressure detection sensor; 52. loading plate; 53. driving member; 54. bottom plate; 55. first connecting rod; 56. second connecting rod; 57. connecting arm; 58. driving rod; 59. driving motor; 6. deformation test structure; 61. electric hydraulic lifting rod; 62. displacement sensor; 7. slider; 8. slide groove; 9. fastening bolt; 10. mounting groove; 11. cover plate; 12. handle; 13. groove. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] It should be noted that, in the specific implementation of the utility model, the terms such as "first" and "second" and other relational terms that may appear are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms such as "include", "comprise" or any other variants thereof that may appear are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the sentence "including a ..." and other defined elements that may appear do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0022] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "provided with" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0023] Example: Figures 1 to 5 As shown: a portable external cable prestressing detection device, comprising a support base 1, the support base 1 is distributed on the left and right, and a fixing clamp 2 adapted to the external cable is provided at the bottom. Specifically, as Figure 2 As shown: the fastening clamp 2 is a semicircular structure and is connected to a slider 7. Figure 2 As shown, the slider is an L-shaped structure as a whole, and the fastening clamp is arranged at the bottom end of the slider. A slide groove 8 is provided on one side of the support seat 1, and the slider 7 is installed in matching with the slide groove 8. In actual construction operations, two external cables are often used for prestress detection; the slider and the fastening clamp of this embodiment are also two groups, and a fastening bolt 9 is also provided on one side of the slider 7, so that the fastening clamp 2 is fixed after being moved to a preset position. The purpose of such a setting is to facilitate the adjustment of external cables of different spacings and positions for support, and to provide sufficient stability in the working scene.

[0024] like Figure 1 As shown: In this embodiment, a detection platform 3 is installed above the support seat 1, and an LED display screen 4 is provided on the outer side of the detection platform 3; the LED display screen is used to display parameters. A backup battery is also provided on one side of the detection platform to provide power drive for the detection device. A pressure loading structure 5 is provided on one side of the detection platform 3, such as Figure 3 As shown in the figure, the pressure loading structure 5 includes a pressure detection sensor 51, a loading plate 52, and a driving member 53. The pressure detection sensor 51 is arranged on the fastening clamp 2, and is used to detect the pressure value of the external cable in real time. The loading plate 52 is movably arranged on the detection platform 3, and the loading plate area is large enough to support the crossbeam. The driving member 53 is configured to drive the loading plate 52 to move up and down to complete the operation of applying a preset pressure value to the external cable.

[0025] like Figure 4As shown: Specifically, the driving member 53 includes a bottom plate 54, a first connecting rod 55, a second connecting rod 56, a connecting arm 57, a driving rod 58 and a driving motor 59. A groove 13 is provided on one side of the detection platform 3, and the bottom plate 54 is arranged at the bottom of the groove 13. There are four first connecting rods 55 symmetrically distributed front and back, left and right, and one end of the first connecting rod 55 is hinged to the bottom plate 54, and the other end is hinged to the second connecting rod 56, and one end of the second connecting rod 56 is hinged to the loading plate 52; there are two connecting arms 57 distributed front and back, and each connecting arm 57 is arranged at the hinge point of the first connecting rod 55 and the second connecting rod 56 in a left and right distribution; the driving rod 58 is distributed front and back and rotatably arranged on the detection platform 3, and the driving rod 58 passes through the two connecting arms 57 and maintains a threaded rotation connection, so that the forward rotation of the driving rod 58 drives the two connecting arms 57 to approach each other to form a lifting structure; the reverse rotation of the driving rod drives the two connecting arms away from each other to form a contraction structure. The driving motor 59 is fixedly mounted on the detection platform 3 through a bracket, and the output shaft is connected to the driving rod 58. The driving motor adopts a servo control motor. The positive rotation of the driving motor drives the driving rod to rotate synchronously. The driving rod is connected to the front and rear side walls of the detection platform through bearings to maintain relative rotation. The driving rod and the connecting arm are threadedly connected. Therefore, the positive rotation of the driving rod will drive the two connecting arms to move closer to each other, forming a lifting structure, and then drive the loading plate to move.

[0026] like Figure 3As shown: In this embodiment, a mounting groove 10 is provided on one side of the detection platform 3, specifically, the mounting groove is vertically distributed and penetrates the support seat, and the electric hydraulic lifting rod 61 is vertically distributed and installed in the mounting groove 10. In this embodiment, a split structure can also be adopted, and the electric hydraulic lifting rod and the displacement sensor are an integrated structure. The electric hydraulic lifting rod can be fixedly installed in the mounting groove, or it can be detachably installed by bolting, thereby ensuring the convenience in the field detection operation. A cover plate 11 is also hinged on one side of the bottom end of the mounting groove 10; in the initial state, the electric hydraulic lifting rod 61 is retracted, the displacement sensor 62 is in the mounting groove 10, and the cover plate is covered by an elastic buckle. In this embodiment, the pressure detection sensor 51 maintains a signal connection with the LED display screen 4, and in the initial state, the loading plate 52 is kept flush with the top surface of the detection platform 3. A deformation test structure 6 is also provided on one side of the detection platform 3, and the deformation test structure 6 includes an electric hydraulic lifting rod 61 and a displacement sensor 62. The electric hydraulic lifting rod 61 is arranged on the detection platform 3, and the displacement sensor 62 is arranged at the end of the electric hydraulic lifting rod 61, and the displacement sensor 62 is electrically connected to the LED display screen 4. In this embodiment, the connection between the LED display screen and the displacement sensor and the pressure detection sensor can be connected and intelligently controlled by a PLC controller. For technicians in this field, the parameter display technical principle of this part is common knowledge, so the applicant will not repeat it. In the detection state, open the cover plate, start the extension of the electric hydraulic lifting rod through the control switch, and then adjust the contact between the displacement sensor and the external cable to perform initialization settings. The purpose of such a setting is to adopt a free telescopic storage method. When the detection equipment is not in use, the driving member drives the loading plate to shrink, so that the loading plate is flush with the detection platform, which not only ensures the flatness and regularity of the detection equipment, but also provides a function of easy carrying. A handle 12 is also provided on the upper end surface of the detection platform 3; such a setting is easy to carry and saves time and effort.

[0027] Working process: Step 1: The staff easily carries the integrated detection equipment to the work site, first fixing the anchor block and external cable on the bridge;

[0028] Step 2: The staff then moves the slider to clamp the corresponding fastening clamps and the external cable to form a stable support structure, and fixes the position of the slider with the fastening bolts; the next step is for the staff to turn on the drive motor, and the forward rotation of the drive motor drives the drive rod to rotate synchronously. The forward rotation of the drive rod will drive the two connecting arms closer to each other to form a jacking structure, and then drive the loading plate to move until the loading plate contacts the bridge surface. At this time, the initialization of the pressure detection sensor is completed. The next step is for the staff to open the cover plate, start the extension of the electric hydraulic lifting rod through the control switch, and then adjust the displacement sensor to contact the external cable, perform the initialization setting of the displacement sensor, and complete the calibration of the detection equipment;

[0029] Step 3: Next, the staff continues to turn on the driving motor to rotate forward so that the shear structure composed of the first connecting rod and the second connecting rod gradually extends, and applies vertical force to the external cable step by step. At the same time, the LED display screen intuitively displays the continuously recorded pressure value of the pressure detection sensor and the detection value of the displacement sensor;

[0030] Step 4: The test system calculates the external cable stress in real time using formula (1):

[0031] Formula (1): ;

[0032] The physical meaning of each symbol in formula (1) is as follows: Figure 5 As shown, T is the loading pressure value obtained by the pressure detection sensor; d1 is the offset value under the current pressurized state obtained by the displacement sensor; L1 and L2 are the lengths of the external cables at the left and right ends of the detection device as the center; F represents the effective stress of the external cable.

[0033] Step 5: When the change in F is less than 3%, stop loading and complete the test of in vitro cable prestress.

[0034] This testing equipment not only greatly improves the efficiency of external cable prestress testing, but also effectively ensures the accuracy of prestress testing. At the same time, it is highly integrated and portable, suitable for different types of external cable stress tests, has high feasibility, is powered by batteries, is also convenient for field operations, and has high testing efficiency.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A portable in vitro cable prestress detection device, characterized in that: The invention comprises a support base (1), the support base (1) is distributed on the left and right, and a fixing clamp (2) adapted to the external cable is provided at the bottom end; a detection platform (3) is installed above the support base (1), and an LED display screen (4) is provided on the outer side of the detection platform (3); a pressure loading structure (5) is provided on one side of the detection platform (3), and the pressure loading structure (5) comprises a pressure detection sensor (51), a loading plate (52), and a driving member (53); the pressure detection sensor (51) is arranged on the fixing clamp (2), the loading plate (52) is movably arranged on the detection platform (3), and the driving member (53) is configured to drive the loading plate (52) to move. ) moves up and down to complete the operation of applying a preset pressure value to the external cable; the pressure detection sensor (51) maintains a signal connection with the LED display screen (4), and in the initial state, the loading plate (52) and the top surface of the detection platform (3) remain flush; a deformation test structure (6) is also provided on one side of the detection platform (3), and the deformation test structure (6) includes an electric hydraulic lifting rod (61) and a displacement sensor (62); the electric hydraulic lifting rod (61) is arranged on the detection platform (3), and the displacement sensor (62) is arranged at the end of the electric hydraulic lifting rod (61), and the displacement sensor (62) is electrically connected to the LED display screen (4).

2. A portable in vitro cable prestress detection device as claimed in claim 1, characterized in that: The fastening clamp (2) is of a semicircular structure and is connected to a slide block (7). A slide groove (8) is provided on one side of the support seat (1), and the slide block (7) is mounted in a matching manner with the slide groove (8).

3. A portable in-vitro cable prestress detection device as claimed in claim 2, characterized in that: A fixing bolt (9) is also provided on one side of the sliding block (7) so that the fixing clamp (2) is fixed after being moved to a preset position.

4. A portable in vitro cable prestressing detection device as claimed in claim 3, characterized in that: The driving member (53) comprises a bottom plate (54), a first connecting rod (55), a second connecting rod (56), a connecting arm (57), a driving rod (58) and a driving motor (59); a groove (13) is provided on one side of the detection platform (3); the bottom plate (54) is arranged at the bottom of the groove; four first connecting rods (55) are symmetrically distributed in the front and rear directions, and one end of the first connecting rod (55) is hinged to the bottom plate (54) and the other end is hinged to the second connecting rod (56); one end of the second connecting rod (56) is hinged to the loading plate (52); There are two connecting arms (57) distributed front and back, and each connecting arm (57) is arranged at a hinge point between a first connecting rod (55) and a second connecting rod (56) in a left-right distributed manner; the driving rod (58) is distributed front and back and is rotatably arranged on the detection platform (3); the driving rod (58) passes through the two connecting arms (57) and maintains a threaded rotation connection, so that the driving rod (58) rotates forward to drive the two connecting arms (57) to approach each other; the driving motor (59) is fixedly installed on the detection platform (3) through a bracket, and the output shaft is connected to the driving rod (58).

5. A portable in vitro cable prestress detection device as claimed in claim 4, characterized in that: A mounting groove (10) is provided on one side of the detection platform (3), and the electric hydraulic lifting rod (61) is fixedly mounted in the mounting groove (10); a cover plate (11) is also hingedly connected to one side of the mounting groove (10); in an initial state, the electric hydraulic lifting rod (61) is retracted, and the displacement sensor (62) is located in the mounting groove (10).

6. A portable in-vitro cable prestress detection device as claimed in claim 5, characterized in that: A handle (12) is also provided on the upper end surface of the detection platform (3).

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