A feedback mechanism for a concrete vibrating rod approaching the bending limit

Abstract

The present invention belongs to the field of concrete vibrating machinery, and particularly relates to a feedback mechanism for a concrete vibrating rod approaching the bending limit; it includes an outer sleeve and an inner sleeve. The outer sleeve is used to be connected with a vibrating device. The center of the inner sleeve is a channel for the free sliding of the vibrating rod. The inner sleeve can rotate circumferentially and swing under the restriction of the outer sleeve. The outer sleeve is a component made of insulating material. A brass electrode is arranged on the outer sleeve on the outer circle of the inner sleeve. The conductive medium on the inner sleeve is connected to the feedback circuit of the control system of the vibrating device. When the swinging angle of the inner sleeve driven by the vibrating rod is too large, the conductive medium of the inner sleeve touches the brass electrode of the outer sleeve, and the feedback circuit is triggered. This device can effectively identify the working state of the vibrating rod with a relatively simple structure, prevent irreparable damage to the vibrating rod, and ensure the smooth progress of the automated pouring and vibrating process. This device can also prevent mortar from being brought into the inner sleeve and entering the vibrating device during long-term use, thus polluting the vibrating device.

Description

Technical Field

[0001] The present invention belongs to the field of concrete vibrating machinery, and particularly relates to a feedback mechanism for a concrete vibrating rod approaching the bending limit. Background Art

[0002] With the increasingly urgent development demand of intelligent construction technology, the pouring processes of many precast box-shaped reinforced concrete components all attempt to use large-scale automated operation equipment for vibration. Since the steel bar binding process of the current precast component table formwork is very complex and full-automatic mechanical binding has not been realized yet; and when manual binding is used, there will be phenomena such as non-standard steel bar binding structures, inaccurate dimensions, and inability to ensure the accurate position of the steel bar protection layer pads installed in the formwork after hoisting into the formwork. The resulting consequence is that the subsequent concrete compaction and vibration process cannot guarantee the reliability of mechanical automated insertion and extraction, especially it is very difficult to accurately insert and vibrate at the accurate points inside the steel bar cage of the web structure. Compared with manual insertion and extraction, it is easier to generate random jamming phenomena and cannot be disposed of in a timely and effective manner, affecting the smooth progress of vibration.

[0003] The internal structure of the rubber tube of the commonly used planetary vibrating rod is as shown in the attached Figure 1 description. The functions of the rubber protection layer and the liner spring protection layer are to protect the internal transmission flexible shaft that rotates at high speed under normal working conditions. When the pads are not standard and the steel bar binding is not standard, when the metal rod head of the vibrating rod automatically inserts and vibrates at the determined points, it will be stuck by the steel bars and the formwork and cannot continue to insert downward. However, at this time, the mechanical structure above will still continue to push the rod tube according to the automated operation process. When the hose is forced to be pushed for a long distance and the lower part is blocked, the vibrating rod at the connection with the mechanical structure will form a large bend, and the built-in spring flexible shaft that rotates at high speed will be blocked, causing instantaneous damage to the rod tube structure.

[0004] Therefore, invent a method and a reliable identification device that can detect the jamming phenomenon in the process of pushing the rod tube in real time, provide a judgment signal in time when the rod tube reaches the maximum bending arc that causes damage, transmit this signal to the control system, and quickly stop the rod tube feeding mechanism from pushing the rod tube to prevent further bending damage of the flexible shaft vibrating rod tube, so as to solve the stability and reliability problem of the concrete automatic insertion and vibration process under the condition of dense steel bars. Summary of the Invention

[0005] The present invention aims to solve the problem that when the flexible shaft vibrating rod head of the planetary vibrating machinery gets stuck with steel bars, formwork, etc., continuously pushing the rod tube will cause a large bend and then damage the vibrating rod tube.

[0006] The present invention provides the following technical solution: A feedback mechanism for a concrete vibrator approaching the bending limit, comprising an outer sleeve and an inner sleeve. The outer sleeve is used to be connected to a vibrating device. The center of the inner sleeve is a channel for the free sliding of the vibrator. The inner sleeve can rotate circumferentially and swing under the restriction of the outer sleeve. The outer sleeve is a component made of insulating material. A brass electrode is provided on the outer sleeve on the outer circle of the inner sleeve. The conductive medium on the inner sleeve is connected to the feedback circuit of the control system of the vibrating device. When the vibrator drives the inner sleeve to swing at an excessive angle, the conductive medium of the inner sleeve touches the brass electrode of the outer sleeve, and the feedback circuit is triggered.

[0007] Further, a cement mortar scraping device for surrounding the vibrator is provided at the bottom end of the inner sleeve.

[0008] Further, the cement mortar scraping device includes a silicone cleaning ring and a fastening ring buckle. The internal thread of the fastening ring buckle is connected to the external thread of the inner sleeve. The silicone cleaning ring is installed in the groove between the bottom end of the inner sleeve and the annular shoulder of the fastening ring buckle. The inner circle of the silicone cleaning ring is used to fit with the surface of the vibrator.

[0009] Further, the inner cavity of the outer sleeve includes a ball socket in the middle and cavities above and below the ball socket with a width greater than that of the ball socket. The inner sleeve has a ball head that fits with the ball socket. The brass electrode is installed in the cavity below the ball socket.

[0010] Further, the outer sleeve is an ABS component, the inner sleeve and the fastening ring buckle are metal components. A circumferentially protruding contact is integrally connected to the part of the inner sleeve below the ball socket. A terminal for the feedback circuit is provided on the fastening ring buckle.

[0011] Further, the inner sleeve is a stainless steel component.

[0012] Compared with the prior art, the advantages of the present invention are as follows:

[0013] The feedback mechanism for a concrete vibrator approaching the bending limit provided by the present invention realizes the function of monitoring the working state of the rod tube during the intelligent vibration operation of railway box girders, forms an intelligent vibration insertion operation protection system, enables the reliable realization of the concrete automatic pouring and vibration process under the condition of a dense steel bar bench form, effectively reduces the labor intensity, saves labor, ensures the operation efficiency, and significantly improves the service life of the vibrator.

[0014] This device can effectively identify the working state of the vibrator with a relatively simple structure, prevent irreparable damage to the vibrator, and ensure the smooth progress of the automatic pouring and vibration process. This device can also prevent mortar from entering the inner sleeve and the vibrating device during long-term use, thus polluting the vibrating device. Description of the Drawings

[0015] Figure 1 It is an internal structure diagram of the rubber rod tube of the vibrator.

[0016] Figure 2 This is a structural schematic diagram of the present invention.

[0017] Figure 3 This is a schematic diagram of the vibrating rod rotating to the limit position when encountering jamming.

[0018] In the figure: 1 - outer sleeve; 2 - brass electrode; 3 - inner sleeve; 4 - silica gel cleaning ring; 5 - fastening ring buckle; 6 - terminal; 7 - rubber protective layer; 8 - transmission flexible shaft; 9 - lining spring protective layer; 10 - vibrating rod. Specific embodiments

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] As Figure 2 shown: A feedback mechanism for a concrete vibrating rod approaching the bending limit includes an outer sleeve 1 and an inner sleeve 3. The outer sleeve 1 is used to connect with the vibrating device. The center of the inner sleeve 3 is a channel for the free sliding of the vibrating rod. The inner sleeve 3 can rotate circumferentially and swing under the restriction of the outer sleeve 1; the outer sleeve 1 is a component made of insulating material. A brass electrode 2 is provided on the outer sleeve 1 around the outer circumference of the inner sleeve 3. The conductive medium on the inner sleeve 3 is connected to the feedback circuit of the control system of the vibrating device. When the vibrating rod drives the inner sleeve 3 to swing at too large an angle, the conductive medium of the inner sleeve 3 touches the brass electrode 2 of the outer sleeve 1, and the feedback circuit is triggered. When the vibrating rod restricted by the inner sleeve 3 bends at a large angle, the conductive medium of the inner sleeve 3 touches the brass electrode 2 to form a short circuit, transmitting an electrical signal to the PLC control system of the vibrating device to control the vibrating device to stop working.

[0021] A cement mortar scraping device surrounding the vibrating rod is provided at the bottom end of the inner sleeve 3. The cement mortar scraping device includes a silica gel cleaning ring 4 and a fastening ring buckle 5. The internal thread of the fastening ring buckle 5 is connected to the external thread of the inner sleeve 3. The silica gel cleaning ring 4 is installed in the groove between the bottom end of the inner sleeve 3 and the annular shoulder of the fastening ring buckle 5. The inner ring of the silica gel cleaning ring 4 is used to fit the surface of the vibrating rod. The cement mortar scraping device can scrape off the concrete mortar adhered to the vibrating rod when the vibrating rod is retracted, preventing the slurry from entering the conduit. Without this device, once the slurry accumulates too much, it will hinder the smooth retraction and extension of the vibrating rod.

[0022] The outer sleeve 1 is fixed on the vibrating device by four nuts. The inner cavity of the outer sleeve 1 includes a spherical socket in the middle and cavities above and below the spherical socket with widths greater than that of the spherical socket. The inner sleeve 3 has a ball head that mates with the spherical socket, and the brass electrode 2 is installed in the cavity below the spherical socket.

[0023] The outer sleeve 1 is an ABS component, the inner sleeve 3 and the fastening ring buckle 5 are stainless steel components. A circumferentially protruding contact is integrally connected to the part of the inner sleeve 3 below the spherical socket. The fastening ring buckle 5 adds the structure of the terminal 6 while fixing the position of the silica gel cleaning ring 4, facilitating the transmission of electrical signals.

[0024] When the vibrating rod is vertically lowered, it is in Figure 1 a state. It has been proven by experiments that small-angle perturbations generated by the vibration of the vibrating rod will not cause false alarms of stop signals. When the vibrating rod is stuck by irregularly tied steel bars or other jamming situations (see Figure 3 ), the rubber tube of the vibrating rod still continues to convey, and the inner sleeve 3 starts to rotate, where θ is the deflection angle between the central axes of the inner sleeve 3 and the outer sleeve 1. According to the mechanical property parameters of the rod tube (rubber rod tube diameter, allowable bending radius) and the height of the free section of the rubber rod tube, the allowable bending angle of the rubber rod tube under actual working conditions is obtained; and further, the allowable deflection angle of the jamming device is obtained. When the offset angle θ reaches the allowable deflection angle θmax, the inner sleeve 3 contacts the brass electrode 2 to form a short circuit and transmit a switch signal. After receiving the signal, the PLC stops the pushing of the vibrating rod and starts to retract the vibrating rod. After adjusting the position, the vibrating operation is restarted.

[0025] Preferably, the value of θmax is particularly crucial. If θmax is too large, it will cause the phenomenon that the insertion of the rod head into jamming cannot be detected in time and damage the rubber rod tube. If θmax is too small, the jamming recognition will be too sensitive and the vibrating process will be interrupted frequently. Precise θmax can achieve a balance between the safety and efficiency of the automatic operation of concrete compaction machinery.

[0026] θmax = f(ΔH, E)

[0027] In the formula, θmax is the allowable deflection angle between the central axes of the inner sleeve and the outer sleeve;

[0028] ΔH is the distance from the bottom surface of the inner sleeve to the free section of the steel bar layer;

[0029] E is the mechanical property parameter of the vibrating rod;

[0030] Taking the φ37 planetary vibrating rod as an example, the experimentally obtained value of θmax is 15°, which meets the specification requirements of the vibrating process. When the vibrating operation in an area is completed and the vibrating rod is retracted, the silica gel cleaning ring will scrape off the cement mortar adhered to the vibrating rod, preventing the cement mortar from contaminating devices such as the guide wheel encoder. Secondly, due to the material characteristics, it will not affect the normal retraction and extension of the vibrating rod.

[0031] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A feedback mechanism for a concrete vibrating rod approaching the bending limit, characterized in that: It includes an outer sleeve (1) and an inner sleeve (3). The outer sleeve (1) is used to be connected to a vibrating device. The center of the inner sleeve (3) is a channel for the free sliding of a vibrating rod. The inner sleeve (3) can rotate circumferentially and swing under the restriction of the outer sleeve (1). The outer sleeve (1) is a component made of insulating material. A brass electrode (2) is arranged on the outer sleeve (1) on the outer circle of the inner sleeve (3). The conductive medium on the inner sleeve (3) is connected to the feedback circuit of the control system of the vibrating device. When the vibrating rod drives the inner sleeve (3) to swing at an excessive angle, the conductive medium of the inner sleeve (3) touches the brass electrode (2) of the outer sleeve (1), and the feedback circuit is triggered.

2. The feedback mechanism for a concrete vibrator approaching the bending limit according to claim 1, characterized in that: A cement mortar scraping device for surrounding the vibrating rod is arranged at the bottom end of the inner sleeve (3).

3. The feedback mechanism for a concrete vibrating rod approaching the bending limit according to claim 2, characterized in that: The cement mortar scraping device includes a silica gel cleaning ring (4) and a fastening ring buckle (5). The internal thread of the fastening ring buckle (5) is connected to the external thread of the inner sleeve (3). The silica gel cleaning ring (4) is embedded in the groove between the bottom end of the inner sleeve (3) and the annular shoulder of the fastening ring buckle (5). The inner circle of the silica gel cleaning ring (4) is used to fit with the surface of the vibrating rod.

4. A feedback mechanism for a concrete vibrator approaching the bending limit according to claim 3, characterized in that: The inner cavity of the outer sleeve (1) includes a spherical socket in the middle and cavities above and below the spherical socket with widths greater than that of the spherical socket. The inner sleeve (3) has a ball head that fits with the spherical socket. The brass electrode (2) is installed in the cavity below the spherical socket.

5. A feedback mechanism for a concrete vibrator approaching the bending limit according to claim 4, characterized in that: The outer sleeve (1) is an ABS component, the inner sleeve (3) and the fastening ring buckle (5) are metal components. A circumferentially protruding contact is integrally connected to the part of the inner sleeve (3) below the spherical socket. A wiring terminal (6) of the feedback circuit is arranged on the fastening ring buckle (5).

6. The feedback mechanism for a concrete vibrator approaching the bending limit according to claim 5, characterized in that: The inner sleeve (3) is a stainless steel component.

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