Damage positioning device and alarm system for internal sliding support of modular telescopic device

Abstract

The invention relates to a damage positioning device and an alarm system for an internal sliding support of a modular telescopic device, which are characterized in that a variable resistance assembly is arranged on the outer side of a hanging bracket of the modular telescopic device, a metal slip sheet of the variable resistance assembly is connected with an external pulley through a metal U-shaped rod, and the pulley is placed on a slide rail which is welded on the upper surface of a support beam in advance; along with the thickness reduction caused by sliding bearing abrasion of the modular telescopic device, the distance between the hanging bracket and the bearing beam is reduced, the hanging bracket moves downwards to cause upward movement of the metal sliding sheet, and the resistance provided by the resistance wire is reduced. When the sliding bearing is damaged, the voltage distributed in the circuit is gradually reduced, the voltage of the alarm is increased, the alarm reaches the rated voltage and normally works to give an alarm when the damage of the sliding bearing reaches a threshold value, and meanwhile, the abrasion state of the sliding bearing is monitored and evaluated in real time through the current indicator. Therefore, on-line monitoring, accurate positioning and real-time alarming of the sliding support of the bridge modular telescopic device are realized.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge structure detection, and in particular relates to a damage positioning alarm system for sliding bearings inside a modular telescopic device. Background Art

[0002] With the rapid development of bridge construction technology, the demand for expansion and contraction of long-span bridges is also gradually increasing. Modular expansion devices are widely used in long-span bridges due to their unique structure. The steel beam can withstand various vehicle loads, and the sliding unit can also provide sufficient expansion and contraction requirements. Compared with other forms of expansion devices, their main advantages include large displacement range, excellent shock absorption and buffering performance, high driving comfort, good sealing and durability. This good performance has gradually made it a widely accepted expansion device by the public.

[0003] The modular expansion device consists of steel, support system, displacement control system and anchor system. The support system consists of supporting beam, supporting box, hanger, sliding support and compression support. The displacement control system is in the form of compression spring, rubber shear spring or hinge. The anchor system is mainly composed of anchor plate and annular anchor bar welded on the side beam and anchor nail welded on the support box. Its working principle is that when the beam end is displaced, each sliding unit moves along the supporting beam under the action of the beam end force, thereby realizing the expansion and contraction requirements of the large-span bridge.

[0004] The main defects of modular telescopic devices include local bending or twisting deformation of the middle steel beam, fatigue cracking of the displacement control spring, severe wear and sliding failure of the sliding bearing and compression bearing, cracking or damage of the concrete in the anchor area, exposed and rusted steel bars, etc. Among them, the wear of the sliding bearing of the modular telescopic device of the bridge is one of the common major defects of the bridge facility. This wear is caused by the large cumulative displacement of the bridge under the action of vehicle load and wind load. The sliding units corresponding to each middle steel beam undergo high-frequency and small-amplitude reciprocating motion along the direction of the supporting beam, and the sliding bearing gradually wears or falls off during the repeated motion.

[0005] Existing research results and actual bridge data show that the longitudinal displacement of many long-span cable-supported bridges is very significant, especially long-span suspension bridges. This results in the modular expansion joints only having a working time of 3-5 years from the beginning of use to the occurrence of damage, which is much shorter than the 15-year design service life stipulated in the "General Specifications for Design of Highway Bridges and Culverts". In addition, the initial construction cost of the modular expansion joints usually does not exceed 1% of the total construction cost of the bridge, but the maintenance cost can even account for 20% of the total maintenance cost of the bridge. The main reason why the modular expansion joints cannot be used is the damage of the sliding bearings.

[0006] When the sliding support is worn out or falls off, the hanger is in direct contact with the surface of the supporting beam, and friction between steel and steel occurs. The friction coefficient increases significantly to 5 times the design value in the specification. At this time, the modular expansion device will not work properly. On the one hand, this will cause the constraint form of the bridge beam end to change, significantly increase the internal force of the bridge structure, and on the other hand, it will also cause the bridge to be unable to achieve free changes in longitudinal displacement, thereby affecting the overall seismic performance of the bridge.

[0007] Regarding the detection methods of sliding supports of modular telescopic devices of bridges, one is the traditional appearance detection method, which is carried out through visual inspection, camera shooting, ultrasonic flaw detection and other methods. Visual inspection is the most direct method. The staff can judge the status by patrolling and observing the surface of the sliding support. Camera shooting can be used in places that are not easy to access. The real-time image of the sliding support is obtained through the camera. Ultrasonic flaw detection can be used to detect whether there are defects such as cracks inside; the second method is to arrange a horizontal displacement sensor at the end of the beam, and deduce the displacement distance of the sliding support by measuring the horizontal displacement at the end of the beam, and then calculate the remaining thickness of the sliding support, and compare it with the allowable minimum thickness, so as to realize the wear alarm of the sliding support. However, this method can only analyze the overall wear of the modular telescopic device, and because the pressure and other factors generated when the vehicle passes through the modular telescopic device cannot be quantified, the displacement of the beam end has different effects on the movement of each sliding support, and it is difficult to accurately locate and alarm the damage of the sliding support. Summary of the invention

[0008] In order to overcome the problems existing in the background technology, the first purpose of the present invention is to provide a device for locating the damaged sliding bearing inside an analog-to-digital telescopic device, by which the wear or breakage of the sliding bearing can be judged according to the changes in the readings of an external ammeter or voltmeter; the second purpose of the present invention is to provide an alarm system including a device for locating the damaged sliding bearing inside an analog-to-digital telescopic device, by connecting an alarm between the positive terminal and the negative terminal of the locating device, when the sliding bearing is worn or broken, an alarm is automatically issued to serve as a reminder and alarm, and the staff can replace and repair the sliding bearing corresponding to the alarm.

[0009] The first object of the present invention is achieved through the following technical solutions:

[0010] The internal sliding support damage positioning device of the modular telescopic device includes a variable resistance component, a U-shaped rod, a pulley and a slide rail; the variable resistance component includes a support 1, a support 2, a support column, a resistance wire and a metal slide;

[0011] The support column is vertically fixed between support one and support two, and the resistance wire is evenly wrapped along the column height direction of the support column; the metal slide is in sliding contact with the resistance wire; the left side rod of the U-shaped rod is connected to the metal slide, and the right side rod is provided with a rotating shaft perpendicular to it, and the pulley is connected to the rotating shaft; the slide rail is arranged on the upper end surface of the support beam, the support column is fixed to the hanger position, and the pulley is slidably connected to the slide rail; the variable resistance assembly is provided with a positive terminal and a negative terminal, and the positive terminal and the negative terminal are connected to an external battery, and an ammeter or a voltmeter through wires.

[0012] Furthermore, the metal slide includes a moving end and two clips connected to the moving end, the clips are in sliding contact with the resistance wire, and the left side rod of the U-shaped rod is connected to the moving end; a rubber slider is fixed on the moving end; the U-shaped rod and the moving end are fixedly connected by the rubber slider; a limit block 1 and a limit block 2 are respectively provided on the support 1 and the support 2, and a metal rod is connected between the limit block 1 and the limit block 2; a sliding hole is opened on the moving end, and the mobile end is slidably connected to the metal rod through the sliding hole.

[0013] Furthermore, the variable resistance assembly is also provided with a shell, and the support 1 and the support 2 are horizontally fixed in the shell.

[0014] Furthermore, the telescopic rod is telescopically and adjustably connected to the right side rod of the U-shaped rod, and the rotating shaft is vertically fixed to the right end surface of the top end of the telescopic rod; the right side rod of the U-shaped rod is a hollow rod, and the telescopic rod is inserted into the right side rod and telescopically connected thereto, and a through-wall bolt is provided on the right side rod, and the telescopic rod and the right side rod of the U-shaped rod are fixed by the through-wall bolt.

[0015] Furthermore, the positive electrode terminal is arranged beside the upper end of the resistance wire, and the negative electrode terminal is arranged at the lower end of the metal rod.

[0016] Furthermore, the positioning alarm device is connected to a battery and connected to a solar panel via a photovoltaic charging controller.

[0017] Furthermore, each sliding support is equipped with a positioning device.

[0018] The internal sliding support damage positioning alarm system of the modular telescopic device includes the above-mentioned positioning device, wherein an alarm is connected between the positive terminal and the negative terminal, and the distance between the clip and the positive terminal is set to the maximum thickness of the sliding support allowed to wear. When the wear thickness of any sliding support of the modular telescopic device reaches the maximum allowable thickness or the sliding support falls off, the hanger and the support beam undergo relative displacement, causing the metal slide to contact the positive terminal, and the alarm sounds.

[0019] The method for using the alarm system comprises the following steps:

[0020] S100: Connect and fix the metal U-shaped rod and the rubber slider, and weld the variable resistor assembly in the direction that the negative terminal is pointing to the opening of the stainless steel shell, and expose the stainless steel shell, adjust the initial position of the metal slider so that the distance between it and the positive terminal is the maximum wear thickness allowed by the sliding support, weld the stainless steel shell opening downward to the side of the modular telescopic device sliding unit hanger, weld the slide rail on the outer edge of the upper surface of the modular telescopic device support beam, place the pulley on the slide rail, adjust the length of the telescopic rod, and fix the position by through-wall bolts;

[0021] S200: Use wires to connect the external ammeter, the alarm, and the positive and negative terminals of the variable resistor component one by one, and then connect each circuit to a battery to form a closed loop. The battery is used as a power source to provide voltage, and the alarm and the resistance wire are respectively divided into a certain voltage in the circuit;

[0022] S300: During the operation of the bridge, the wear of the sliding support causes the thickness to decrease, which in turn causes the metal slider and the resistance wire inside the variable resistor component to slide relative to each other, which in turn causes the resistance provided by the resistance wire in the circuit to change, and the current will also change. The wear condition of each sliding support is detected through the external current display number.

[0023] Among them, in step S300, the current magnitude in the circuit is expressed as:

[0024]

[0025] Where I is the current representation number, U is the battery voltage, R x is the resistance provided by the resistance wire (404) in the circuit, R A is the internal resistance of the ammeter, and R0 is the resistance of the alarm.

[0026] When the wear thickness of any sliding support of the modular telescopic device reaches the maximum allowable thickness or the sliding support falls off, the hanger and the support beam are relatively displaced, causing the metal slide to contact the positive terminal. At this time, the alarm reaches the rated voltage and works normally and alarms. The circuit voltage division principle is:

[0027]

[0028] Among them, the voltage at the beam end of the alarm is U0. When U0=U, the staff is notified to immediately replace and repair the sliding bearing corresponding to the alarm that is sounding.

[0029] Beneficial effects of the present invention:

[0030] The present invention installs a positioning device near each sliding support. During the operation of the bridge, the staff can record the external current indication number to evaluate the wear state of each sliding support. When the sliding support is severely worn or falls off, the metal slide and the resistance wire are relatively displaced, thereby reducing the resistance of the resistance wire in the closed circuit and changing the current indication number. The wear degree of the sliding support can be detected by the current indication number.

[0031] The present invention adds an alarm on the basis of the positioning device, sets the alarm voltage of the alarm to be equal to the power supply voltage, sets the distance between the clip and the positive terminal to the maximum wear thickness allowed by the sliding support, and when the voltage of the alarm reaches the calibrated rated voltage and works normally, the alarm starts to alarm, thereby realizing damage positioning and real-time alarm of the sliding support inside the modular telescopic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the connection relationship between the housing and the U-shaped rod of the present invention;

[0033] Figure 2 It is a structural schematic diagram of the damage localization device of the present invention;

[0034] Figure 3 An exploded view of the damage localization device of the present invention;

[0035] Figure 4 It is a schematic diagram of the installation relationship between the damage locating device of the present invention and the hanger and the support beam;

[0036] Figure 5 This is a schematic diagram of the state of the metal slide when the alarm device of the present invention sounds an alarm;

[0037] Figure 6 The circuit diagram of the new alarm system used in this paper;

[0038] Figure 7 This is a voltage variation diagram of the alarm device of the present invention;

[0039] Figure 8 This is a current variation diagram of the alarm device of the present invention;

[0040] Fig. 9 This is a flow chart of the sliding bearing wear monitoring method of the present invention;

[0041] In the figure: 1. shell; 2. U-shaped rod; 3. telescopic rod; 4. through-wall bolt; 5. rotating shaft; 6. pulley; 7. supporting beam; 8. slide rail; 9. middle steel beam; 10. hanger; 11. rubber slider; 12. metal rod; 13. positive terminal; 14. negative terminal; 15. metal slide; 16. sliding support; 401. support one; 402. support two; 403. support column; 404. resistance wire; 405. limit block one; 406. limit block two; 1501. mobile end; 1502. clip. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0043] In order to more clearly illustrate the present invention, it is described in detail through the following examples.

[0044] Example 1

[0045] A modular telescopic device internal sliding support damage positioning device

[0046] like Figure 1-5 As shown, the modular telescopic device internal sliding support damage positioning device comprises a housing 1, a resistor assembly, a U-shaped rod 2, a pulley 6 and a slide rail 8. The variable resistance assembly comprises a support 1 401, a support 2 402, a support column 403, a resistance wire 404, a metal slide 15, a housing 1, a metal rod 12, a positive terminal 13 and a negative terminal 14.

[0047] Support 1 401 and support 2 402 are fixed horizontally in the stainless steel housing 1, support column 403 is fixed vertically between support 1 401 and support 2 402, resistance wire 404 is evenly surrounded on the surface of support column 403 along the column height direction, and positive terminal 13 is set on the edge of resistance wire 404 near support 1 401. Support 1 401 and support 2 402 are used to fix support column 403 to ensure that support column 403 does not move with metal slide 15, resistance wire 404 is used to provide resistance in the circuit to limit the voltage divided by the alarm, and it should be ensured that resistance wire 404 is tightly and evenly surrounded and the cross-sectional size of each part of the resistance wire is exactly the same, and when the sliding support 16 is in normal working state, that is, the thickness of the sliding support 16 is not worn to the maximum wear thickness allowed, resistance wire 404 always provides resistance in the circuit.

[0048] The support 1 401 and the support 2 402 are respectively provided with a limit block 1 405 and a limit block 2 406, and a reserved circular hole is provided in the center of the two limit blocks. The metal rod 12 passes through the reserved circular hole and is fixedly connected with the limit block 1 405 and the limit block 2 406, and a negative terminal 14 is provided at the end of the metal rod 12 close to the opening direction of the stainless steel shell 1. The limit block 1 405 and the limit block 2 406 are used to ensure that the metal slide 15 always moves within the maximum longitudinal length range of the resistance wire 404 to prevent the metal slide 15 from separating from the resistance wire 404 and causing a circuit break. The length of the metal rod 12 should be greater than the spacing between the limit block 1 405 and the limit block 2 406 to ensure that there is enough length of the metal rod 12 so that the wire can be normally connected to the negative terminal 14.

[0049] The metal rod 12 is fixedly connected to the limit block 1 405 and the limit block 2 406 to prevent the metal rod 12 from falling off from the limit block 1 405 and the limit block 2 406 due to its own weight, and a metal slide 15 is installed on the metal rod 12, and the metal slide 15 includes a moving end 1501 and a clip 1502. A sliding hole is provided at the center position of the upper part of the moving end 1501 along the direction of the support column, and the side is fixedly connected to the rubber slider 11. The clip 1502 part of the metal slide 15 is in close contact with the resistance wire 404, and the initial position of the clip 1502 is related to the maximum wear thickness allowed by the warning sliding support 16, that is, during installation, the distance between the metal slide 15 and the positive terminal 13 is set to the maximum wear thickness allowed by the sliding support 16, and then the length of the telescopic rod 3 is adjusted to make the bottom surface of the pulley 6 normally contact with the groove surface of the slide rail 8, and then tighten the bolt 4 to ensure that the telescopic rod 3 will not slide freely in the telescopic groove of the metal U-shaped rod 2.

[0050] The outer shell 1 is welded to the outside of the hanger 10. The welding position does not affect the normal use of the modular telescopic device, and can also ensure the uniqueness and stability of each alarm device and its respective detection sliding support 16. The stainless steel outer shell 1 is provided to prevent debris from adhering to the metal wire 404 or other components, causing the metal slide 15 to be unable to slide normally or the circuit to short-circuit and open. The metal U-shaped rod 2 is close to the hanger 10, and the sliding support 16 is located between the hanger 10 and the supporting beam 7.

[0051] The left end of the metal U-shaped rod 2 (with Figure 2 The right end of the U-shaped rod 2 is a hollow rod, and the telescopic rod 3 is inserted into the right rod and is telescopically connected to the right rod. The right rod is also provided with a through-wall bolt 4. When the telescopic adjustment of the telescopic rod 3 and the U-shaped rod 2 is completed, the positions of the two are locked by the through-wall bolt 4. The rotating shaft 5 is vertically welded to the right end surface of the top of the telescopic rod 3.

[0052] The pulley 6 is installed on the rotating shaft 5. The pulley 6 can rotate freely around the rotating shaft 5. The wheel width of the pulley 6 is slightly smaller than the width of the slide groove of the metal slide rail 8. The side of the rotating shaft 5 contacts the upper surface of the metal slide rail 8. In order to prevent the pulley 6 from getting stuck and causing excessive wear of the pulley 6, and failing to provide normal alarm, a certain amount of lubricating oil can be applied between the rotating shaft 5 and the pulley 6 to ensure normal sliding of the pulley 6. During the operation of the positioning alarm device, the device can move longitudinally along the support beam 7 with the sliding unit.

[0053] The positive terminal 13 and the negative terminal 14 are connected to an external ammeter or voltmeter and a battery via wires to form a positioning detection device. When the sliding support 16 is worn, the distance between the hanger 10 and the upper end surface of the support beam 7 becomes smaller, and the hanger 10 and the support beam 7 are relatively displaced, while the height of the pulley 6 is fixed, so that the distance between the metal slide 15 and the positive terminal 13 becomes smaller, and the ammeter or voltmeter reading changes. The wear condition of the sliding support 16 can be judged based on the change in the reading.

[0054] As a preferred solution, the storage battery is connected to the solar panel via a photovoltaic charging controller, and the solar energy is used to power the storage battery.

[0055] As a preferred solution, the housing 1 is made of stainless steel, and the U-shaped rod 2 and the slide rail 8 are both made of metal.

[0056] Example 2

[0057] This embodiment adds an alarm on the basis of Embodiment 1, and this embodiment mainly describes the connection position and function of the alarm.

[0058] like Figure 1-7 As shown, the positive terminal 13 and the negative terminal 14 are connected to an external ammeter, an alarm and a battery through a wire to form a positioning alarm device, and the rated voltage of the alarm is the same as the battery voltage, and the positioning alarm device is connected to the battery and connected to the solar panel through a photovoltaic charging controller. At the same time, the distance between the clip 1502 and the positive terminal 13 is set to the maximum wear thickness allowed by the sliding support 16. When the wear thickness of any sliding support 16 of the modular telescopic device reaches the maximum allowable thickness or the sliding support 16 falls off, the hanger 10 and the support beam 7 are relatively displaced, causing the metal slide 15 to contact the positive terminal 13, and the alarm sounds.

[0059] like Figure 5 As shown, when the wear of the sliding support 16 reaches a threshold or falls off, the hanger 10 and the support beam 7 are relatively displaced, which causes the metal slider 15 and the resistance wire 404 to slide relative to each other. At this time, the metal slider just contacts the positive terminal 13, and the resistance wire 404 does not provide resistance in the circuit and does not distribute voltage, and the alarm reaches the rated voltage and alarms normally.

[0060] The alarm system of this embodiment is used to monitor the wear of the sliding bearing, as follows:

[0061] S100: Bond and fix the metal U-shaped rod 2 to the rubber slider 11, and weld the displacement control assembly inside the stainless steel shell 1 in the direction of the opening with the negative terminal 14 pointing to facilitate the connection of the wires. Adjust the initial position of the metal slide 15 so that its distance from the positive terminal 13 is the maximum wear thickness allowed by the sliding support 16. Weld the stainless steel shell 1 with the opening facing downward to the side of the modular telescopic device sliding unit hanger 10. When welding, it is not advisable to weld the entire side to the hanger 10. A certain outer surface of the stainless steel shell 1 should be retained beyond the edge of the hanger 10 so that the metal U-shaped rod 2 can move freely. Weld the metal slide rail 8 to the outer edge of the upper surface of the modular telescopic device support beam 7, place the pulley 6 on the metal slide rail 8, adjust the position of the telescopic rod 3, and tighten the bolt 4 after confirming that it is correct.

[0062] S200: Use wires to connect each external ammeter, alarm and each alarm device's positive terminal 13 and negative terminal 14 one by one, and then connect each circuit to a battery to form a closed loop. To ensure that the battery can continuously supply power, the battery is connected to the solar panel via a photovoltaic charging controller;

[0063] S300: During the operation of the bridge, the staff can evaluate the wear of each sliding bearing 16 through the external current indication number. The current size in the prediction circuit can be expressed as:

[0064]

[0065] Where I is the current representation number, U is the battery voltage, R x R is the resistance provided by the resistance wire in the circuit. A is the internal resistance of the ammeter, R0 is the alarm resistance, and the internal resistance of the ammeter R A Compared with the resistance wire resistance R x The alarm resistance R0 is relatively small and can be ignored.

[0066] S400: When the wear thickness of any sliding support 16 of the modular telescopic device reaches the maximum allowable wear thickness or the sliding support 16 falls off, the metal slide 15 contacts the positive terminal 13, the alarm reaches the rated voltage and works normally and alarms. The circuit voltage division principle is:

[0067]

[0068] Among them, the voltage at the beam end of the alarm is U0. When U0=U, the staff should be notified to immediately replace and repair the sliding bearing corresponding to the alarm that is sounding the alarm.

[0069] The following is a description of the working mechanism of the modular telescopic device and the working process of the positioning alarm device, as follows:

[0070] During the operation of the bridge, due to the effects of vehicle loads and wind loads, the long-span bridge will experience small-amplitude, high-frequency longitudinal reciprocating displacements. When the ambient temperature rises, the longitudinal expansion of the beam body due to heat will also produce longitudinal displacements. In order to meet the normal longitudinal displacement of the beam end, the modular telescopic device is designed and widely used. When the beam end is displaced, each middle steel beam 7 will also move accordingly. The sliding support 16 gradually wears out during the long-term friction with the supporting beam 7. In addition, due to the presence of dust on the supporting beam 7, the vehicle load passing through the modular telescopic device causes increased friction, loss of lubricant, etc. Factors will also lead to increased wear. The longitudinal displacement experienced by each sliding bearing 16 is not the same. In special circumstances, the sliding bearing 16 may fall off due to vehicle impact and other reasons. When the sliding bearing 16 falls off or is worn too much, it will cause direct contact between the hanger 10 and the supporting beam 9 to produce friction. At this time, the friction coefficient will increase significantly to five times the standard design, which will cause the sliding unit to fail to slide normally and the modular telescopic device to fail to work normally, thereby increasing the internal forces of other bridge components such as the main beam and bearing, seriously threatening the operational safety of large-span bridges.

[0071] The working principle of the alarm device is: Figure 6 As shown, the positive terminal 13 and the negative terminal 14 are connected to the external ammeter, the alarm and the battery through wires, and the battery with the same rated voltage as the alarm is selected, so that a complete closed circuit is formed. Figure 7 As shown in FIG. 1 , when the operation starts, the resistance wire 404 and the alarm device simultaneously receive a certain voltage of the battery. As the wear gradually increases, the vertical position of the pulley 6 remains the same as the support beam 7 and does not change. However, each sliding unit moves downward as a whole due to the decrease in the thickness of the sliding support 16, so that the metal slide 15 moves upward relative to the resistance wire 404, thereby changing the resistance of the resistance wire 404 in the entire closed loop, as shown in FIG. Figure 8 As shown, the wear thickness of each sliding bearing 16 can be calculated in real time based on the displayed value of the external ammeter and the status can be evaluated. When the maximum wear thickness allowed by the sliding bearing 16 is reached, the metal slide 15 moves upward to the end of the support column 403 and contacts the negative terminal 14. At this time, the resistance provided by the resistance wire 404 is zero, and the resistance wire 404 no longer divides the voltage. At the same time, the alarm reaches the rated voltage and starts to work normally and starts to alarm. The electronic alarm is connected to the monitoring center control system via a communication cable loop or a wireless transmission module, thereby realizing real-time and accurate alarm of the sliding bearing 16 of the modular telescopic device.

[0072] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A device for locating damage to the internal sliding support of a modular telescopic device, characterized in that: It comprises a variable resistance assembly, a U-shaped rod (2), a pulley (6) and a slide rail (8); the variable resistance assembly comprises a support 1 (401), a support 2 (402), a support column (403), a resistance wire (404) and a metal slide (15); The support column (403) is vertically fixed between the support 1 (401) and the support 2 (402), and the resistance wire (404) is uniformly wound along the column height direction of the support column (403); the metal slide (15) is in sliding contact with the resistance wire (404); the left side rod of the U-shaped rod (2) is connected to the metal slide (15), and the right side rod of the U-shaped rod (2) is provided with a rotating shaft (5) perpendicular to the U-shaped rod (2), and the pulley (6) is connected to the rotating shaft (5); the slide rail (8) is arranged on the upper end surface of the support beam (7), the support column (403) and the hanger (10) are fixed in position, and the pulley (6) can move along the slide rail (8); the variable resistance component is provided with a positive electrode terminal (13) and a negative electrode terminal (14), and the positive electrode terminal (13) and the negative electrode terminal (14) are connected to an external storage battery and an ammeter or a voltmeter through a wire.

2. The positioning device according to claim 1, characterized in that: The metal slide (15) comprises a moving end (1501) and two clips (1502) connected to the moving end (1501), the clips (1502) are in sliding contact with the resistance wire (404), and the left side rod of the U-shaped rod (2) is connected to the moving end (1501); a rubber slider (11) is fixed on the moving end (1501); the U-shaped rod (2) and the moving end (1501) are fixedly connected via the rubber slider (11); a limit block 1 (405) and a limit block 2 (406) are respectively provided on the support 1 (401) and the support 2 (402), and a metal rod (12) is connected between the limit block 1 (405) and the limit block 2 (406); a sliding hole is provided on the moving end (1501), and the moving end (1501) is slidably connected to the metal rod (12) via the sliding hole.

3. The positioning device according to claim 2, characterized in that: The variable resistance assembly is also provided with a shell, and the support 1 (401) and the support 2 (402) are horizontally fixed in the shell.

4. The positioning device according to claim 2, characterized in that: The right side rod of the U-shaped rod (2) is also provided with a telescopic rod (3); the telescopic rod (3) is telescopically connected to the right side rod of the U-shaped rod (2), and the rotating shaft (5) is vertically fixed to the right end surface of the top end of the telescopic rod (3); the right side rod of the U-shaped rod (2) is a hollow rod, the telescopic rod (3) is inserted into the right side rod and is telescopically connected thereto, a through-wall bolt (4) is provided on the right side rod, and the telescopic rod (3) and the right side rod of the U-shaped rod (2) are locked by the through-wall bolt (4).

5. The positioning device according to claim 4, characterized in that: The positive electrode terminal (13) is arranged beside the upper end of the resistance wire (404), and the negative electrode terminal (14) is arranged at the lower end of the metal rod (12).

6. The positioning device according to claim 1, characterized in that: An alarm is also connected between the positive electrode terminal (13) and the negative electrode terminal (14); the alarm is connected to the battery and connected to the solar panel via a photovoltaic charging controller.

7. The positioning device according to any one of claims 1 to 6, characterized in that: Each sliding support (16) is equipped with a positioning device.

8. An alarm system comprising a positioning device according to any one of claims 1 to 5, characterized in that: An alarm is also connected between the positive terminal (13) and the negative terminal (14). The distance between the clip (1502) and the positive terminal (13) is set to the maximum allowable wear thickness of the sliding support (16). When the wear thickness of any sliding support (16) of the modular telescopic device reaches the maximum allowable thickness or the sliding support (16) falls off, the hanger (10) and the support beam (7) are relatively displaced, causing the metal slide (15) to contact the positive terminal (13), and the alarm sounds.

9. The method for using the alarm system according to claim 8, characterized in that: The steps include: S100: Connect and fix the U-shaped rod (2) and the rubber slider (11), and weld the variable resistance assembly in the direction of the negative terminal (14) pointing to the opening of the shell (1), and let it protrude from the shell (1), adjust the initial position of the metal slide (15) so that the distance between it and the positive terminal (13) is the maximum thickness allowed by the wear of the sliding support (16), weld the shell (1) opening downward to the side of the modular telescopic device sliding unit hanger (10), weld the slide rail (8) on the outer edge of the upper surface of the modular telescopic device support beam (7), place the pulley (6) on the slide rail (8), adjust the length of the telescopic rod (3) and fix the position by the through-wall bolt (4); S200: Use wires to connect the external ammeter, the alarm, and the positive terminal (13) and the negative terminal (14) of the variable resistor component one by one, and then connect the circuit to a battery to form a closed loop. The battery is used as a power source to provide voltage, and the alarm and the resistance wire (404) respectively receive voltage in the circuit; S300: During the operation of the bridge, the wear thickness of the sliding support (16) decreases, causing the metal slider (15) of the variable resistor assembly and the resistance wire (404) to slide relative to each other, which in turn causes the resistance provided by the resistance wire (404) in the circuit to change, and the ammeter or voltmeter will also change. The wear condition of each sliding support (16) is judged by the external ammeter or voltmeter.

10. The method of use according to claim 9, in step S300, the magnitude of the current in the circuit is: Where I is the current representation number, U is the battery voltage, R x is the resistance provided by the resistance wire (404) in the circuit, R A is the internal resistance of the ammeter, R0 is the resistance of the alarm; When the wear thickness of any sliding support (16) of the modular telescopic device reaches the maximum allowable thickness or the sliding support falls off, the hanger (10) and the support beam (7) are relatively displaced, causing the metal slide (15) to contact the positive terminal (13). At this time, the alarm reaches the rated voltage and works normally and alarms. The circuit voltage is: in, The voltage at the beam end of the alarm is U0. When U0=U, notify the staff to immediately replace and repair the sliding bearing corresponding to the alarm that is sounding.

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