CN105241769A - Dynamic loading device and dynamic loading method for concrete pole - Google Patents

Abstract

The invention relates to a dynamic loading device for cement electric poles, which comprises a steel wire rope fixed at the top of the cement electric pole at one end, and the other end of the steel rope is fixed on the ground through several guide wheels fixed at longitudinal intervals; the guide wheels are fixed on the cement pole through a bracket. The side of the electric pole; a tension sensor is also connected in series on the steel wire rope, and the tension sensor is electrically connected with a control unit; it also includes a cam mechanism for dynamically pulling the steel wire rope, and the cam mechanism includes a fixed frame, along which the fixed frame A two-way screw rod is provided in the length direction, and semi-elliptic cams are respectively fixed on the two sliding nuts on the two-way screw rod. The two cams are symmetrical to the center of the fixed frame and move along the fixed frame; The motor drives the rotation, and the rotation center coincides with the center of the fixed frame. The beneficial effect of the invention lies in that: the cement electric pole fixed at the bottom or similar rod-like objects are dynamically loaded by the loading device, and the ability to withstand dynamic loads such as typhoons is simulated.

Description

A dynamic loading device and loading method for cement poles

technical field

The invention relates to a cement pole dynamic loading device and a loading method, which are suitable for dynamically loading cement poles fixed at the bottom or similar pole-shaped objects, and simulating their ability to bear dynamic loads.

Background technique

In the power transmission and distribution network, cement poles tend to collapse in batches due to typhoons, especially in coastal areas, and this situation will be more serious. The cement pole is blown down by the typhoon. One case is that the strength of the cement pole is not enough and it breaks under the action of a strong typhoon. The collapse of the pole. In either case, it may cause the power transmission and distribution lines to break, hurt people, or even produce other more serious consequences. For this reason, some technical means must be adopted to test whether the actual power transmission and distribution cement poles can withstand the set typhoon level. The force effect of cement poles under the action of typhoon can be equivalent to a certain static force or the repeated action of dynamic force. If a certain static force is applied to the cement pole, its effect is the same as that of a typhoon, then by artificially loading the specific static force on the cement pole, it can be used to check whether the cement pole is toppled or broken. If a dynamic force of a certain frequency and amplitude is applied to the cement pole, its effect is the same as that of a typhoon, then by artificially applying a load with this frequency and amplitude characteristics to the cement pole, it can also play a role. Check whether the cement pole will fall or break. In terms of static equivalent loading of cement poles, the patent (utility model: ZL201320721531, invention patent: CN201310569485) provides the specific design scheme and loading method of the loading device. Since the thrust applied to the cement pole remains constant or changes very slowly during the static loading process, it cannot reflect the dynamic effect of the typhoon on the cement pole. The typhoon itself has a certain frequency characteristic. Since the static loading cannot reflect the transient properties of the typhoon, it is difficult to achieve the same effect as the typhoon. Therefore, it is not ideal to use the static loading method to evaluate the effect of the typhoon on the cement pole. Research dynamic loading methods.

Contents of the invention

The object of the present invention is to provide a dynamic loading device and loading method for cement electric poles to realize the dynamic load that can be borne by simulating cement electric poles.

The solution adopted by the present invention to solve the technical problem is: a dynamic loading device for cement electric poles, which includes a steel wire rope fixed at the top of the cement electric pole at one end, and the other end of the steel rope is fixed on the ground through several guide wheels fixed at longitudinal intervals, The height of the guide wheel at the highest point is at the same height as the fixed position of the steel wire rope and the cement pole; the guide wheel is fixed on the side of the cement pole through a bracket; a tension sensor is also connected in series on the steel wire rope, and the The tension sensor is electrically connected with a control unit; it also includes a cam mechanism for dynamically pulling the steel wire rope. Half elliptical cams are respectively fixed on the sliding nuts, and the two cams are symmetrical to the center of the fixed frame and move along the fixed frame; the fixed frame is driven to rotate by a motor, and the center of rotation is the same as The centers coincide.

Further, a speed reducer is fixedly sleeved at the center of the fixing frame, and the speed reducer is connected with the motor.

Further, the outer edge of the cam is provided with a groove along the circumference, and the steel wire rope is pressed into the groove.

Further, the center of the fixing frame coincides with the midpoint of the line connecting the vertices of the two cams, and the central axis of the output shaft of the reducer is perpendicular to the line connecting the vertices of the two cams.

Further, guide rails are respectively provided on both sides of the fixed frame along the length direction, and the cam is mounted on the guide rails and moves along the guide rails.

Further, the two-way screw rod is arranged in the middle of the fixed frame and fixed by the bearing seats at both ends of the fixed frame, one end of the two-way screw rod passes through the bearing seat and is provided with a handle for manual rotation of the two-way screw rod handle.

Further, it also includes a signal acquisition and processing module, the tension sensor is electrically connected to the control unit through the signal acquisition and processing module, and the motor is electrically connected to the control unit through a motor drive module.

Further, it also includes a display module for displaying the current rotation speed of the motor and the current output tension value of the tension sensor, and the display module is connected with the control unit.

The present invention also provides a loading method of the cement pole dynamic loading device as described above, comprising the following steps:

Step S1: Calculate the minimum value, maximum value and loading frequency of the dynamic loading force according to the typhoon level, the height of the cement pole and the loading action point;

Step S2: setting the initial state of the wire rope;

Step S20: Rotate the two-way screw through a rotating handle to adjust the distance between the two sliding nuts on the two-way screw so that the line connecting the two cam vertices is the shortest, press the wire rope into the groove on the outer edge of the cam, and drive it through the control unit The motor makes the fixed frame rotate around its center, so that the distance between the contact point of the wire rope and the cam and the center of the fixed frame is the shortest, stop driving the motor, and the center of the fixed frame is the center of rotation;

Step S21: pre-tightening the wire rope so that the pre-tightening force of the wire rope is equal to the minimum value of the dynamic loading force, and the wire rope is in the initial state at this time;

Step S3: setting the saturation state of the wire rope;

Step S31: Drive the motor to rotate through the control unit, and observe the tension value of the tension sensor at the same time. When the tension value reaches the maximum, stop the motor operation. If the maximum tension value reaches the maximum value of the required dynamic loading force, the wire rope is in a saturated state , go to step S4; otherwise go to step S32;

Step S32: Rotate the two-way screw so that the cam moves in the opposite direction on the fixed frame along the guide rail, and observe the tension value of the tension sensor at the same time;

Step S33: If the tension value of the wire rope reaches the maximum value of the dynamic loading force, stop rotating the two-way screw, and the wire rope is in a saturated state at this time; otherwise, go to step S32;

Step S4: Determine the speed of the motor; set the speed of the motor as n rpm, and the reduction ratio of the reducer is , then the dynamic loading frequency is , when the frequency of the loading force is determined, the motor speed n can be obtained accordingly;

Step S5: The motor is driven by the control unit according to the rotation speed n to drive the fixed frame to continuously rotate, and the cement pole is dynamically loaded, and during the loading process, the tensile force of the steel wire rope, that is, the change data of the loading force is recorded.

Compared with the prior art, the present invention has the following beneficial effects: For a typhoon in a certain direction, when it acts on the cement pole, the dynamic force generated by it can only be the pulsation value of the wind direction, and it is impossible to produce a typhoon with Forward and reverse alternating force, that is to say, the cement pole is unidirectional under the typhoon force. Based on this, the present invention proposes to use a steel wire rope to load the dynamic load (the steel wire rope can only bear tension, but not pressure). The wire rope is flexible, and the direction of the wire rope can be easily changed through the guide wheel, and the tension of the wire rope will not change with the change of the direction of the wire rope, which provides great convenience for the design and installation of the loading device and reduces the requirements for the loading site. The cam mechanism rotates continuously under the drive of the motor, thereby driving the steel wire rope to be elastic and tight alternately, so that the cement pole produces a reciprocating motion in the direction of the steel wire rope tension. The advantage of this method is that the power source realizes the reciprocating motion of dynamic loading on the cement pole under the condition of continuous rotation (rather than frequent forward and reverse switching), and the range of dynamic loading force amplitude is adjustable, which greatly improves the power. The lifetime of the source is also improved in the flexibility of the loading device.

Description of drawings

Below in conjunction with accompanying drawing, the patent of the present invention is further described.

Fig. 1 is a structural diagram of the cement pole dynamic loading device of the present invention.

Fig. 2 is a structural schematic diagram of the cam mechanism of the present invention.

Fig. 3 a is the state that the cam of the present invention is in level;

Fig. 3b is the state that the steel wire rope of the present invention is pressed into the cam groove;

Fig. 3c is the steel wire rope pretension state of the present invention;

Figure 3d is the vertical state of the cam when the motor of the present invention rotates;

Fig. 3e is the state in which the distance between the cams is adjusted by the two-way screw rod in the present invention by rotating the handle.

In the figure: 1- cement pole; 2- steel wire rope; 3- guide wheel; 4- motor; 5- reducer; 6- cam; 7- tension sensor; 8- fixed frame; .

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1-2, a dynamic loading device for cement poles includes a steel wire rope 2 fixed at the top of a cement pole 1 at one end, and the other end of the steel rope 2 is fixed to the ground through several guide wheels 3 fixed at longitudinal intervals. , the height of the guide wheel 3 at the highest point is at the same height as the fixed position of the steel wire rope 2 and the cement pole 1; the guide wheel 3 is fixed on the side of the cement pole 1 through a bracket; A tension sensor 7 is connected, and the tension sensor 7 is electrically connected with a control unit; it also includes a cam 6 mechanism for dynamically pulling the steel wire rope 2, and the cam 6 mechanism includes a fixed frame 8 along the length of the fixed frame 8. The direction is provided with a two-way screw 10, and the two sliding nuts on the two-way screw 10 are respectively fixed with semi-elliptical cams 6, the two cams 6 are symmetrical to the center of the fixed frame 8, and move along the fixed frame 8 ; The fixed frame 8 is driven to rotate by a motor 4 , and the center of rotation coincides with the center of the fixed frame 8 .

In the actual loading device, the number of its guide wheels 3 can be flexibly set according to actual needs and site installation conditions, but the height of the guide wheels 3 at the highest point needs to be at the same height as the steel wire rope 2 fixed on the top of the cement pole 1, The steel wire rope 2 forms 90° with the cement pole 1, so as to ensure that under the constant pulling force, the generated moment to the cement pole 1 is maximum. From the above, it can be seen that the present invention fixes the cement pole 1 with the steel wire rope 2, and the steel wire rope 2 is flexible, so that it is convenient to change the direction of the steel wire rope 2, so the loading device can flexibly change the direction of the force. The dynamic loading force generated by the steel wire rope 2 realizes the reciprocating tension movement according to the set frequency through the cam 6 mechanism, so that the power source can realize the adjustable force amplitude under the condition of continuous rotation (rather than frequent positive and negative switching). Dynamic continuous loading greatly improves the life of the power source and also improves the flexibility of the loading device.

Further, a speed reducer 5 is fixedly sleeved at the center of the fixing frame 8 , and the speed reducer 5 is connected with the motor 4 . The speed reducer 5 plays the role of increasing the torque and reducing the speed. For example, the reduction ratio is 80, and the speed of the motor 4 is 3000 rpm, so the loading frequency is 1.25 Hz. Since the power spectrum energy of the typhoon is mainly concentrated within 1 Hz, so A set of conventional parameter design can meet the requirements of dynamic loading.

Further, the outer edge of the cam 6 is provided with a groove along the circumference, and the steel wire rope 2 is pressed into the groove.

Further, the center of the fixed frame 8 coincides with the midpoint of the line connecting the vertices of the two cams 6 , and the central axis of the output shaft of the reducer 5 is perpendicular to the line connecting the vertices of the two cams 6 . Ensure that the pulling force produced by the good cam 6 on the steel wire rope 2 is symmetrical.

Further, guide rails 9 are respectively provided on both sides of the fixing frame 8 along the length direction, and the cam 6 is erected on the guide rails 9 and moves along the guide rails 9 .

Further, the two-way screw rod 10 is arranged in the middle of the fixed frame 8 and is fixed by bearing seats located at both ends of the fixed frame 8, one end of the two-way screw rod 10 passes through the bearing seat and is provided with a shaft for manual rotation. The handle of the two-way screw mandrel 10. The sliding nut of the two-way screw mandrel 10 has a trapezoidal structure and has a self-locking function. When the motor 4 rotates, the distance between the two cams 6 remains constant.

Further, it also includes a signal acquisition and processing module, the tension sensor 7 is electrically connected to the control unit through the signal acquisition and processing module, and the motor 4 is electrically connected to the control unit through a motor 4 drive module.

Further, it also includes a display module for displaying the current rotation speed of the motor 4 and the current output tension value of the tension sensor 7, and the display module is connected with the control unit. The control unit can adopt a personal computer, an industrial computer or other embedded controllers, and the signal acquisition and processing module performs AD conversion, amplification, filtering and other processing on the sensor signal, and displays the converted data in the display module after the control unit; The control unit outputs instructions to the motor 4 drive module to control the speed of the motor 4 . The signal acquisition and processing module can adopt PCI or USB bus data acquisition card, the motor 4 and the motor 4 drive module can adopt AC servo motor 4 and its supporting driver, and the control unit can also be connected with a man-machine interface, which can be a touch screen Or keyboard, monitor, etc.

As shown in Figures 3a-3e, the present invention also provides a loading method for the above-mentioned dynamic loading device for cement poles, which includes the following steps:

Step S1: Calculate the minimum value, maximum value and loading frequency of the dynamic loading force according to the typhoon level, the height of the cement pole and the loading action point;

Step S2: setting the initial state of the wire rope 2;

Step S20: Rotate the two-way screw 10 through a rotating handle, and adjust the distance between the two sliding nuts on the two-way screw 10, so that the connection line between the vertices of the two cams 6 is the shortest, as shown in Figure 3a; press the wire rope 2 into the outside of the cam 6 In the groove of the edge, and drive the motor 4 through the control unit to make the fixed frame 8 rotate around its center, so that the distance between the contact point of the wire rope 2 and the cam 6 and the center of the fixed frame 8 is the shortest, stop driving the motor 4, and the center of the fixed frame 8 is rotating Center, as shown in Figure 3b;

Step S21: pre-tighten the steel wire rope 2, so that the pre-tightening force of the steel wire rope 2 is equal to the minimum value of the dynamic loading force, and the steel wire rope 2 is in the initial state at this time, as shown in Figure 3c;

Step S3: setting the saturation state of the wire rope 2;

Step S31: Drive the motor 4 to rotate through the control unit, and observe the tension value of the tension sensor 7 at the same time. When the tension reaches the maximum value, stop the rotation of the motor, as shown in Figure 3d. If the maximum tension has reached the required dynamic loading force maximum value, then the wire rope 2 is in a saturated state at this time, and go to step S4; otherwise, go to step S32;

Step S32: Rotate the two-way screw rod 10, so that the cam 6 moves in the opposite direction along the guide rail 9 on the fixed frame 8, and observe the tension value of the tension sensor 7 at the same time;

Step S33: If the tension value of the wire rope 2 reaches the maximum value of the dynamic loading force, stop rotating the bidirectional screw 10, and the wire rope 2 is in a saturated state at this time, as shown in FIG. 3e; otherwise, go to step S32;

Step S4: Determine the speed of the motor 4; set the speed of the motor 4 as n rpm, and the reduction ratio of the reducer 5 is , then the dynamic loading frequency is , when the frequency of the loading force is determined, the speed n of the motor 4 can be obtained accordingly;

Step S5: The motor 4 is driven by the control unit according to the rotation speed n to drive the fixed frame 8 to continuously rotate, so as to implement dynamic loading on the cement pole 1, and record the tension of the steel wire rope 2, that is, the change data of the loading force.

In summary, the present invention provides a dynamic loading device and method for cement poles, which can realize dynamic tension loading of cement poles through steel wire ropes, thereby simulating the ability of cement poles to withstand typhoons.

The above preferred embodiments provided by the present invention further describe the purpose, technical solutions and advantages of the present invention in detail. It should be understood that the above descriptions are only preferred embodiments of the present invention and are not intended to limit In the present invention, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (9)

1. a cement electric pole dynamic loading device, it is characterized in that: comprise the wire rope that cement electric pole top is fixed in one end, the other end of described wire rope is fixed on ground through the angle sheave that several longitudinal separation is fixing, and the fixed position of the height and wire rope and cement electric pole that are positioned at the angle sheave of highest point is in sustained height; Described angle sheave is fixed on the side of cement electric pole through a support; Described wire rope is also serially connected with a pulling force sensor, and described pulling force sensor is electrically connected with a control module; Also comprise one for dynamically pulling the cam mechanism of described wire rope, described cam mechanism comprises a fixed mount, is provided with a Bidirectional-screw along fixed mount length direction, be positioned on two sliding nuts on Bidirectional-screw and be fixed with the elliptoid cam of half respectively, two cams relative to described fixed mount Central Symmetry, and move along described fixed mount; Described fixed mount drives through a motor and rotates, and the center superposition of rotation center and described fixed mount.

2. a kind of cement electric pole dynamic loading device according to claim 1, is characterized in that: the center fixed cover of described fixed mount is connected to one speed reducer, and described speed reduction unit is connected with described motor.

3. a kind of cement electric pole dynamic loading device according to claim 1, is characterized in that: described cam outer rim is circumferentially provided with groove, and described wire rope is pressed in described groove.

4. a kind of cement electric pole dynamic loading device according to claim 1, is characterized in that: the center of described fixed mount overlaps with the mid point of two cam summit lines, and the central axis of described reducer output shaft is vertical with two cam summit lines.

5. a kind of cement electric pole dynamic loading device according to claim 1, is characterized in that: the both sides of described fixed mount are respectively equipped with guide rail along its length, and described cam holder is located on described guide rail and is moved along described guide rail.

6. a kind of cement electric pole dynamic loading device according to claim 1, it is characterized in that: described Bidirectional-screw is arranged in the middle part of described fixed mount and bearing seat through being positioned at fixed mount two ends is fixed, described Bidirectional-screw wherein one end is provided with one for the handle of manual rotation Bidirectional-screw through described bearing seat.

7. a kind of cement electric pole dynamic loading device according to claim 1, it is characterized in that: also comprise a signal acquisition process module, described pulling force sensor is electrically connected with control module through signal acquisition process module, and described motor is electrically connected with described control module through a motor drive module.

8. a kind of cement electric pole dynamic loading device according to claim 7, is characterized in that: also comprise one for showing the display module of the current rotating speed of motor and current pulling force sensor output value of thrust, described display module is connected with described control module.

9. a loading method for cement electric pole dynamic loading device as claimed in claim 1, is characterized in that, comprise the following steps:

Step S1: according to typhoon grade, cement electric pole height and loading application point, calculate the minimum value of dynamic load power, maximal value and loading frequency;

Step S2: the original state of setting wire rope;

Step S20: rotate Bidirectional-screw by a rotary handle, adjustment is positioned at the distance of two sliding nuts on Bidirectional-screw, make the line on two cam summits the shortest, wire rope is pressed in the groove of cam outer rim, and make fixed mount around its center rotating by control module drive motor, make wire rope and cam contact point the shortest to fixed mount centre distance, stop drive motor, fixed mount center is rotation center;

Step S21: pretension wire rope, make wire rope pretightning force equal the minimum value of dynamic load power, now wire rope is in original state;

Step S3: the state of saturation of setting wire rope;

Step S31: rotated by control module drive motor, observes the value of thrust of pulling force sensor simultaneously, when value of thrust reaches maximum, stop electric machine rotation, if this pulling force maximal value reaches the maximal value of required dynamic load power, then wire rope is in state of saturation, goes to step S4; Otherwise go to step S32;

Step S32: rotate Bidirectional-screw, makes cam along guide rail in fixed mount oppositely movement, observes the value of thrust of pulling force sensor simultaneously;

Step S33: if when the value of thrust of wire rope reaches the maximal value of dynamic load power, stop the rotation Bidirectional-screw, and now wire rope is in state of saturation; Otherwise go to step S32;

Step S4: the rotating speed determining motor; If motor speed is n rpm, speed reduction unit reduction gear ratio is , then dynamic load frequency is , after determining loading force frequency, motor speed n can be obtained accordingly;

Step S5: drive fixed mount continuous rotation according to rotating speed n drive motor by control module, carries out dynamic load namely to cement electric pole, records the delta data in loading procedure of lineoutofservice signal pull and loading force simultaneously.