Anchor cable dynamometer with transversely-arranged vibrating wire

Abstract

The invention relates to the field of structure safety monitoring, and discloses a vibrating wire transverse anchor cable dynamometer, which comprises an upper pressure-bearing body, a lower pressure-bearing body and a steel cylinder, the steel cylinder is used for fixing the upper pressure-bearing body and the lower pressure-bearing body, the upper pressure-bearing body and the lower pressure-bearing body are respectively provided with an axial through hole for an anchor cable to pass through, the end face of the upper pressure-bearing body is flush with the steel cylinder, and the end face of the lower pressure-bearing body is flush with the steel cylinder. Grooves are formed in the upper end face of the upper pressure-bearing body, the grooves are annularly and evenly distributed in the upper end face of the upper pressure-bearing body, vibrating string columns are longitudinally and symmetrically arranged at the grooves, the symmetrically arranged vibrating string columns are used for installing transverse vibrating strings, electromagnetic coil grooves are formed in the surfaces of the grooves, and the lower end face of the lower pressure-bearing body is connected with the upper end face of the upper pressure-bearing body in a matched mode. The non-groove part of the upper end face of the upper pressure-bearing body forms an upper pressure-bearing face, and the lower end face of the lower pressure-bearing body is connected with the upper pressure-bearing face. According to the scheme, the anchor cable dynamometer is compact in structure, small in size and small in occupied space, and the testing sensitivity and the response characteristic are enhanced through the vibrating wire transverse arrangement mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of structural safety monitoring, in particular to a vibrating string transversely arranged anchor cable dynamometer. BACKGROUND

[0002] The anchor cable dynamometer is a sensor for monitoring the anchoring state of the prestressed anchor cable of the hydraulic structure and other concrete structures, rock slopes, bridges, etc. The anchor cable dynamometer is generally designed based on vibrating strings, and there are two strings, three strings, four strings and six strings according to the number of vibrating strings. The real-time measurement values of each branch strain sensor of the dynamometer are read out by a vibrating string frequency reader, and the pressure applied by the anchor cable can be calculated by using the instrument characteristic parameters. However, the steel string of the current vibrating string anchor cable is longitudinally arranged in a symmetrical or equilateral triangle on the pressure cylinder of the anchor cable, which has a large volume and occupies a large space, and the stress monitoring sensitivity is poor. SUMMARY

[0003] The purpose of the present application is to provide a vibrating string transversely arranged anchor cable dynamometer to solve the problems of large volume and large space occupation of the current anchor cable dynamometer.

[0004] To achieve the above-mentioned purpose, the present application provides a vibrating string transversely arranged anchor cable dynamometer, which comprises an upper pressure-bearing body, a lower pressure-bearing body and a steel cylinder, the steel cylinder is used to fix the upper pressure-bearing body and the lower pressure-bearing body, the upper pressure-bearing body and the lower pressure-bearing body are respectively provided with an axial through hole for the anchor cable to pass through, the end face of the upper pressure-bearing body is flush with the steel cylinder, the upper end face of the upper pressure-bearing body is provided with a groove, the groove is annularly and uniformly distributed on the upper end face of the upper pressure-bearing body, longitudinally symmetrical vibrating string columns are arranged at the groove, the symmetrical vibrating string columns are used to install transverse vibrating strings, the surface of the groove is provided with an electromagnetic coil groove, the lower end face of the lower pressure-bearing body and the upper end face of the upper pressure-bearing body are connected, the non-groove part of the upper end face of the upper pressure-bearing body forms an upper pressure-bearing surface, and the lower end face of the lower pressure-bearing body is connected with the upper pressure-bearing surface.

[0005] The principle of the present application is that the upper pressure-bearing body and the lower pressure-bearing body are installed in the steel cylinder, then the anchor cable passes through the axial through holes of the upper pressure-bearing body and the lower pressure-bearing body, and then the steel cylinder is fixed on the corresponding structure through the fixed anchor. When the anchor cable acts, the anchor cable acts on the steel cylinder through the fixed anchor, thereby causing the axial deformation of the upper pressure-bearing body and the lower pressure-bearing body. The setting of the groove causes the upper end face of the upper pressure-bearing body to produce inconsistent deformation, so that the vibrating string stress changes and the vibration frequency changes, thereby affecting the change of the induced electromotive force of the electromagnetic coil. The frequency change of the induced electromotive force in the electromagnetic coil is measured to obtain the force value acting on the anchor cable dynamometer. The relationship between the force value and the frequency is usually calibrated through experimental test.

[0006] The advantages of the scheme are that: compared with the traditional anchor cable dynamometer, the anchor cable dynamometer does not need to design a long steel cylinder to match the installation of the vibrating string, is compact in structure, small in size, occupies less space, and significantly improves the convenience of installation and operation; at the same time, the reduction in size directly reduces material consumption and production cost; the recess is arranged in the anchor cable dynamometer to form a hollow structure, the overall stability of the structure is improved by the internal hollow structure combined with the transverse arrangement of the vibrating string, and the transverse arrangement of the vibrating string effectively reduces the risk of vibrating string failure (such as not vibrating) caused by non-axial external force interference, so that more accurate measurement data is obtained, and the sensitivity and response characteristics of the test are enhanced.

[0007] Preferably, the lower end surface of the lower pressure bearing body is provided with a lower pressure bearing surface matched with the upper pressure bearing surface, and a gap is left between the vibrating string column and the lower end surface of the lower pressure bearing body when the upper pressure bearing body and the lower pressure bearing body are connected. By forming a gap between the vibrating string column and the lower end surface of the lower pressure bearing body, the influence of friction on the vibrating string column caused by the relative misalignment sliding of the upper pressure bearing body and the lower pressure bearing body is avoided; the vibrating string only bears axial tension, avoiding the interference of lateral force, and only bears tension without bearing pressure, so that the impact resistance is improved and the service life is longer.

[0008] Preferably, a limiting column is arranged on the upper pressure bearing surface, and a limiting hole for installing the limiting column is arranged on the lower pressure bearing surface. The limiting column and the limiting hole make the upper pressure bearing body and the lower pressure bearing body form a precise positioning cooperation, effectively preventing the circumferential misalignment between the upper pressure bearing body and the lower pressure bearing body, and avoiding the functional failure or structural damage of the equipment caused by the misalignment of the components.

[0009] Preferably, a bolt through hole is arranged on the limiting column, and the upper pressure bearing body is provided with a bolt through hole corresponding to the bolt through hole, and the bolt through hole is used for installing a bolt. The through hole is arranged on the limiting column, and the lower pressure bearing body is connected through the bolt, so as to ensure the stability of the upper and lower pressure bearing bodies after combination.

[0010] Preferably, the limiting columns are annularly and uniformly arranged on the upper pressure bearing surface. The annular and uniform design of the limiting columns can avoid the local stress concentration, which helps to improve the stability of the overall structure; and can enhance the rigidity of the structure, so that it is more stable when bearing external load.

[0011] Preferably, the axial section of the limiting column is trapezoidal. When bearing vertical load, the lower tension area is larger, so that the upper pressure bearing body bears force more uniformly; the trapezoidal design can reduce the center position of the structure, thereby improving the stability of the overall structure and the anti-overturning ability.

[0012] Preferably, the inside of the steel cylinder is provided with positioning grooves matching the upper and lower pressure-bearing bodies respectively. The inner wall is precisely processed with positioning grooves matching the profiles of the upper and lower pressure-bearing bodies. During assembly, the corresponding pressure-bearing bodies and the grooves are tightly matched through interference press-fitting process, so as to realize high-precision positioning and rigid locking of the core module in the steel cylinder.

[0013] Preferably, the vibrating string column is provided with a vibrating string through hole, and the axis of the vibrating string through hole is perpendicular to the axis of the vibrating string column. The vibrating string through hole is provided to facilitate the installation of the vibrating string.

[0014] Preferably, the electromagnetic coil groove is located at the middle part of the corresponding vibrating string. In this way, the electromagnetic conversion efficiency can be maximized, the excitation force and the detection signal amplitude can be provided to be stronger, the detection can be more sensitive, the generation of transverse swing and torsional vibration can be reduced, the vibration mode of the vibrating string can be stabilized, and accurate and reliable detection results can be obtained.

[0015] Preferably, the upper end face of the upper pressure-bearing body is provided with a sealing ring groove in the middle part, and the lower end face of the lower pressure-bearing body is also provided with a corresponding sealing ring groove. During the tensioning of the anchor cable, the upper pressure-bearing body and the lower pressure-bearing body will act relatively, the sealing ring is installed in the sealing ring groove, the possible gap between the steel cylinder and the upper pressure-bearing body and the lower pressure-bearing body is reduced, and the reliability of the electronic components is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an explosion schematic diagram of the anchor cable dynamometer of the embodiment of the present application.

[0017] Figure 2 It is a structural schematic diagram of the upper pressure-bearing body of the embodiment of the present application.

[0018] Figure 3 It is a structural schematic diagram of the lower pressure-bearing body of the embodiment of the present application.

[0019] Figure 4 It is a structural schematic diagram of the steel cylinder of the embodiment of the present application. DETAILED DESCRIPTION

[0020] The following will be further described in detail through specific embodiments:

[0021] The reference signs in the drawings of the specification include: lower pressure-bearing body 1, lower pressure-bearing face 11, limiting hole 12, upper pressure-bearing body 2, upper pressure-bearing face 21, limiting column 22, vibrating string column 23, electromagnetic coil groove 24, steel cylinder 3, positioning groove 31.

[0022] Embodiment:

[0023] A vibrating string transverse anchor cable dynamometer, like Figure 1The structure includes a lower bearing body 1, an upper bearing body 2, and a steel cylinder 3. The upper bearing body 2 and the lower bearing body 1 each have axial through holes for the anchor cable to pass through. The steel cylinder 3 is used to fix the upper bearing body 2 and the lower bearing body 1. The upper bearing body 2 and the lower bearing body 1 are installed inside the steel cylinder 3, and then the anchor cable is passed through the axial through holes in the upper bearing body 2 and the lower bearing body 1. The steel cylinder 3 is then fixed to the corresponding structure using a fixing anchor. When the anchor cable is in action, it acts on the steel cylinder 3 through the fixing anchor, thereby causing axial deformation of the upper bearing body 2 and the lower bearing body 1. The magnitude of the anchor cable force is obtained by observing the change in the vibration frequency of the corresponding vibrating wire on the upper bearing body 2.

[0024] Among them, the steel cylinder 3 is used to protect the stress-bearing structures of the upper pressure-bearing body 2 and the lower pressure-bearing body 1, such as Figure 4 As shown, the inner wall of the steel cylinder 3 is provided with positioning grooves 31 that match the upper pressure-bearing body 2 and the lower pressure-bearing body 1 respectively. Positioning grooves 31 that match the contours of the upper pressure-bearing body 2 and the lower pressure-bearing body 1 are precisely machined on the inner wall of the steel cylinder 3. During assembly, through an interference fit process, the corresponding pressure-bearing body and the groove form a tight interference fit, thereby achieving high-precision positioning and rigid locking of the core module within the steel cylinder 3, and realizing the protection of the load-bearing main structure by the steel cylinder 3.

[0025] Among them, sealing rings are provided at the connection points of the upper pressure bearing body 2 and the lower pressure bearing body 1 with the positioning groove 31 of the steel cylinder 3 to ensure the stability of the structural connection.

[0026] In this design, the lower pressure-bearing body 1, the upper pressure-bearing body 2, and the steel cylinder 3 are coaxially arranged, facilitating the installation of the lower pressure-bearing body 1 and the upper pressure-bearing body 2 into the steel cylinder 3. The end face of the upper pressure-bearing body 2 is flush with the steel cylinder 3. In this embodiment, both the lower pressure-bearing body 1 and the upper pressure-bearing body 2 are cylindrical, and the diameters of the lower pressure-bearing body 1 and the upper pressure-bearing body 2 are the same.

[0027] like Figure 2 As shown, the upper end face of the upper pressure body 2 is provided with a groove, which is evenly distributed in a ring on the upper end face of the upper pressure body 2. The non-grooved part of the upper end face of the upper pressure body 2 forms the upper pressure surface 21. The upper end face of the upper pressure body 2 and the lower end face of the lower pressure body 1 are connected in a fitting manner. Specifically, the lower end face of the underground pressure body 1 is connected to the upper pressure surface 21.

[0028] A sealing ring groove is provided in the middle of the upper end face of the upper pressure body 2, and a corresponding sealing ring groove is also provided in the lower end face of the lower pressure body 1. During the tensioning process of the anchor cable, the upper pressure body 2 and the lower pressure body 1 will interact with each other. By installing a sealing ring in the sealing ring groove, the relative friction and damage between the upper pressure body 2 and the lower pressure body 1 are reduced.

[0029] The longitudinal symmetry of the groove is provided with a vibrating string column 23, and the vibrating string column 23 arranged symmetrically is used to install the transverse vibrating string, and the groove surface is provided with an electromagnetic coil groove 24. The setting of the groove makes the upper end surface of the upper pressure-bearing body 2 produce inconsistent deformation, changes the vibrating string stress and changes the vibrating frequency, and then affects the change of the electromagnetic coil induced electromotive force. By measuring the frequency change of the induced electromotive force in the electromagnetic coil, the force value acting on the anchor cable dynamometer is obtained. In the scheme, the transverse arrangement of the vibrating string effectively reduces the risk of vibrating string failure (such as not vibrating) caused by non-axial external force interference, so as to obtain more accurate measurement data and enhance the sensitivity and response characteristics of the test.

[0030] In the embodiment, three groups of grooves are provided, and each group of grooves is provided with a group of vibrating string columns 23, so that the three groups of vibrating string columns 23 are uniformly distributed around the central axial through hole of the upper pressure-bearing body 2. The triangular symmetric layout design can ensure the measurement accuracy, significantly improve the structural rigidity, effectively suppress the adverse effects of pressure-bearing body deformation on the vibrating string, such as tension loss or abnormal frequency response, and guarantee the reliable excitation and stable working state of the vibrating string.

[0031] As shown in Figure 3 The lower end surface of the lower pressure-bearing body 1 is provided with a lower pressure-bearing surface 11 matched with the upper pressure-bearing surface 21, and when the upper pressure-bearing body 2 and the lower pressure-bearing body 1 are connected, a gap is left between the vibrating string column 23 and the lower end surface of the lower pressure-bearing body 1. By forming a gap between the vibrating string column 23 and the lower end surface of the lower pressure-bearing body 1, the frictional force of the vibrating string column 23 caused by the relative misalignment sliding of the upper pressure-bearing body 2 and the lower pressure-bearing body 1 is avoided; the vibrating string only bears axial tension, avoiding the interference of lateral force, and only bears tension without bearing pressure, so that the impact resistance is improved and the service life is longer. In the scheme, the lower end surface of the lower pressure-bearing body 1 is also provided with grooves corresponding to the grooves of the upper pressure-bearing surface 21, which together form the vibrating string column 23 installation space. The non-groove part of the lower end surface of the lower pressure-bearing body 1 forms the lower pressure-bearing surface 11.

[0032] The vibrating string column 23 is provided with a vibrating string through hole, and the axis of the vibrating string through hole is perpendicular to the axis of the vibrating string column 23. The vibrating string through hole is provided to facilitate the installation of the vibrating string.

[0033] The electromagnetic coil slot 24 is located at the middle of the corresponding vibrating string. In this way, the electromagnetic conversion efficiency can be maximized, a stronger exciting force and a detection signal amplitude can be provided, and the detection is more sensitive; the generation of transverse swing and torsional vibration can be reduced, which helps to stabilize the vibration mode of the vibrating string to obtain accurate and reliable detection results. The relative motion principle of the electromagnetic coil and the vibrating string in the scheme and how to measure the force size according to the changes of the two are prior art, and the present application does not improve this part. The present application changes the distribution position and distribution mode of the vibrating string of the traditional anchor cable dynamometer. The anchor cable dynamometer of the present scheme does not need to design a relatively long steel cylinder 3 to match the installation of the vibrating string. The structure is compact, small in size, and occupies less space, which significantly improves the convenience of installation and operation. At the same time, the reduction in size directly reduces material consumption and production cost.

[0034] The limiting column 22 is arranged on the upper bearing surface 21, and the limiting hole 12 for installing the limiting column 22 is arranged on the lower bearing surface 11. The limiting column 22 and the limiting hole 12 make the upper bearing body 2 and the lower bearing body 1 form a precise positioning cooperation, effectively prevent the circumferential misplacement between the upper bearing body 2 and the lower bearing body 1, and avoid the equipment function failure or structural damage caused by the component misplacement.

[0035] The limiting column 22 is annularly and uniformly arranged on the upper bearing surface 21. The annular and uniform design of the limiting column 22 can avoid the local stress concentration, and help to improve the stability of the overall structure; and can enhance the rigidity of the structure, so that the structure is more stable when bearing external load.

[0036] In the present scheme, the cross section of the limiting column 22 is trapezoidal. When bearing the vertical load, the lower tensile area is larger, so that the upper bearing body 2 is more uniformly stressed; the trapezoidal design can reduce the center position of the structure, thereby improving the stability of the overall structure and the anti-overturning ability.

[0037] The limiting column 22 is provided with a bolt through hole, and the upper bearing body 2 is provided with a bolt through hole corresponding to the bolt through hole, and the bolt through hole is used for installing a bolt. The through hole is arranged on the limiting column 22, and the limiting column 22 is connected with the lower bearing body 1 through the bolt, so as to ensure the stability of the upper and lower bearing bodies 1 after being combined.

[0038] In the present scheme, the sealing rings are all rubber sealing rings, which have excellent elasticity and stretchability, and are low in cost.

[0039] The specific implementation process is as follows:

[0040] The use method of the anchor cable dynamometer in the scheme is same as that of the traditional anchor cable dynamometer, when in use, firstly, the corresponding sealing ring is installed on the upper pressure bearing body 2 and the lower pressure bearing body 1, then the upper pressure bearing body 2 and the lower pressure bearing body 1 are made into close interference fit with the corresponding positioning groove 31 through interference press fitting process, the high-precision positioning and rigid locking of the core module in the steel cylinder 3 are completed. Then the anchor cable is passed through the axial through holes of the anchor pad, the upper pressure bearing body 2 and the lower pressure bearing body 1, the structure of the upper pressure bearing body 2, the lower pressure bearing body 1 and the steel cylinder 3 is contacted with the anchor pad, and then the steel cylinder 3 is fixed on the anchor pad and the corresponding slope surface structure through the fixed anchor.

[0041] When the anchor cable is subjected to the slope load, the anchor cable acts on the steel cylinder 3 through the fixed anchor, the lower pressure bearing body 1 and the upper pressure bearing body 2 cooperate to form the transmission path of the axial load, the upper pressure bearing body 2 and the lower pressure bearing body 1 produce axial deformation under the action of the anchor cable, the setting of the groove makes the upper end surface of the upper pressure bearing body 2 produce inconsistent deformation, the vibration stress changes and the vibration frequency changes, and then the change of the induced electromotive force of the electromagnetic coil is affected, the frequency change of the induced electromotive force in the electromagnetic coil is measured, and the force value acting on the anchor cable dynamometer is obtained.

[0042] The basic parameter setting of the anchor cable dynamometer in the embodiment is shown in Table 1:

[0043] Table 1 Basic parameters of the facility

[0044] Cable inside diameter 80 mm Product range 0-400 KN Vibration wire count 3 Measurement accuracy ±0.5 Operating temperature ≤-25-60° Power supply Solar power (automated monitoring device) Insulation resistance ≥ 50 MΩ Force cylinder height 80 / 91 mm Cable outside diameter 180 mm Overall error ≤ 2.5% FS Waterproof sealing Maintained in water under specified pressure for 30 min

[0045] The data measurement method and calculation of the anchor cable dynamometer in the embodiment are as follows:

[0046] The calculation formula of the facility is:

[0047] The vibrating wire type reading instrument is connected with the lead wire of the facility, and the frequency value displayed after the frequency is stable is the test value of the frequency this time. The frequency value of the test sensor is converted by the formula, and the calculation formula is as follows:

[0048] A=D(f a 2 -f b 2 )

[0049] In the formula, A is the force value (KN)

[0050] D is the calibration coefficient of the measured anchor cable (KN / Hz 2 )

[0051] fb is the average value during measurement (Hz 2 )

[0052] fa is the initial frequency value before measurement (Hz 2 )

[0053] The facility is equipped with a special measuring data line, which is the same as the general anchor cable meter. The data line core is black, red, green and yellow. The black line is the common line. If a reading instrument is used, two wire clamps (black and red) are connected to the black-red, black-green and black-yellow of the facility, respectively, and the data output of the three groups of vibrating strings are connected, respectively. The average value of the three groups of data (unit F) is calculated, such as using automatic monitoring equipment. The average value of the three groups of vibrating strings is the final output data.

[0054] The reliability and accuracy of the measuring device are verified by systematic experiments. The experiments use a hydraulic machine to simulate the actual working environment of the anchor cable meter. The loading test is carried out in the pressure range of 0-400KN, as shown in Table 2. In order to ensure the integrity and accuracy of the data, the experiment sets a pressure recording point every 50KN, a total of 9 measurement intervals. The experimental data shows that during the whole pressure change process, the output signal of the measuring device is highly consistent with the standard pressure value applied by the hydraulic machine, and the error is not more than 2%. Even in the high pressure segment (300-400KN) test, the device can still maintain excellent measurement stability, and the maximum relative error is not more than 1%. These experimental data fully prove that the invention has excellent measurement accuracy and environmental adaptability, and can meet the strict requirements of anchor cable force value monitoring in engineering practice. In addition, the repeatability test also verifies that the device has good measurement consistency.

[0055] Table 2 Pressure loading test data

[0056]

[0057] Compared with the traditional anchor cable dynamometer, the anchor cable dynamometer of the present scheme has compact structure, small size, and occupies less space, which significantly improves the convenience of installation and operation. The reduction in volume directly reduces material consumption and production cost. The hollow structure in the device and the transverse arrangement of the vibrating strings improve the overall stability of the structure and enhance the sensitivity and response characteristics of the test. The transverse arrangement of the vibrating strings effectively reduces the risk of vibrating string failure (such as not vibrating) caused by non-axial external force interference, thereby obtaining more accurate measurement data.

[0058] The above-mentioned are only embodiments of the present application, and common technical solutions and / or common knowledge of the scheme are not described in detail. It should be pointed out that, for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, and in the present application, unless otherwise specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances. The protection scope claimed in the present application should be subject to the content of its claims, and the specific embodiments and the like in the specification can be used to explain the content of the claims.

Claims

1. A vibrating wire transverse cable dynamometer, characterized in that, The utility model relates to a kind of pressure-bearing body, including: Upper pressure-bearing body, lower pressure-bearing body and steel cylinder, the steel cylinder is used to fix upper pressure-bearing body and lower pressure-bearing body, the axial through-hole for anchor cable is respectively equipped with in upper pressure-bearing body and lower pressure-bearing body, the end surface of upper pressure-bearing body is flush with steel cylinder, the upper end surface of upper pressure-bearing body is equipped with recess, the recess is annularly distributed on the upper end surface of upper pressure-bearing body, longitudinal symmetry is equipped with vibrating string column at the recess, symmetrically arranged vibrating string column is used to install transverse vibrating string, the surface of recess is equipped with electromagnetic coil groove, the lower end surface of lower pressure-bearing body and the upper end surface of upper pressure-bearing body are connected, the upper end surface of upper pressure-bearing body is not recessed portion and forms upper pressure-bearing surface, the lower end surface of lower pressure-bearing body and upper pressure-bearing surface are connected.

2. A wire-in-line cable dynamometer according to claim 1, wherein: The lower end surface of the lower pressure-bearing body is equipped with the lower pressure-bearing surface matched with the upper pressure-bearing surface, and the vibrating string column and the lower end surface of the lower pressure-bearing body are left with a gap when the upper pressure-bearing body and the lower pressure-bearing body are connected.

3. A wire-in-line cable dynamometer according to claim 2, wherein: The upper pressure-bearing surface is equipped with a limiting column, and the lower pressure-bearing surface is equipped with a limiting hole for installing the limiting column.

4. A wire-in-line cable dynamometer according to claim 3, wherein: The limiting column is equipped with a bolt through hole, and the upper pressure-bearing body is equipped with a corresponding bolt through hole, and the bolt through hole is used to install a bolt.

5. A wire-in-line cable dynamometer according to claim 3, wherein: The limiting column is annularly distributed on the upper pressure-bearing surface.

6. A wire-in-line cable dynamometer according to claim 3, wherein: The axial section of the limiting column is trapezoidal.

7. A wire-in-line cable dynamometer according to claim 1, wherein: The inside of the steel cylinder is equipped with a positioning groove matched with the upper pressure-bearing body and the lower pressure-bearing body.

8. A wire-in-line cable dynamometer according to claim 1, wherein: The vibrating string column is equipped with a vibrating string through hole, and the axis of the vibrating string through hole is perpendicular to the axis of the vibrating string column.

9. A wire-in-line cable dynamometer according to claim 1, wherein: The electromagnetic coil groove is located at the middle part of the corresponding vibrating string.

10. A wire-in-line cable dynamometer according to claim 1, wherein: The upper end surface of the upper pressure-bearing body is equipped with a sealing ring groove in the middle part, and the lower end surface of the lower pressure-bearing body is also equipped with a corresponding sealing ring groove.

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