Concrete vibrator rotation angle measuring device

Abstract

The invention discloses a device for measuring the rotation angle of a vibrator of a concrete vibrator, comprising: a magnet fixed on the rim of a vibrator turntable; a plurality of Hall sensors evenly distributed on the circumference of a fixed disk of the vibrator to form an angle scale, wherein each Hall sensor represents an angle value corresponding to its position on the circumference of the fixed disk, and the Hall sensor is encapsulated in a flexible protective belt, which is coated on the circumference of the fixed disk of the vibrator; and a signal processor for displaying and recording the angle value represented by the Hall sensor.

Description

Technical Field

[0001] The invention relates to a concrete vibrator, in particular to a vibrator rotation angle measuring device of the vibrator. Background Art

[0002] Large-scale concrete projects, such as hydropower station dams, are all constructed by vibrating concrete trucks. Concrete vibrators are a type of special large-scale engineering machinery with a vibrator at the front end of its working arm. The vibrator has a fixed plate and a turntable corresponding to each other. The turntable has a plurality of vibrating rods, and the turntable can rotate relative to the fixed plate. When working, while the vibrating rods vibrate, the turntable also rotates slowly to eliminate bubbles in the concrete pouring and make the concrete dense.

[0003] Concrete vibration is a key process in concrete pouring. The monitoring and control of vibration quality during the process is one of the important links in concrete quality control. Conventionally, the concrete vibration range is visually inspected through on-site command or by on-site operators, and the comprehensiveness of the vibration range is controlled by experience. In actual operation, it is difficult for operators to accurately judge the concrete vibration phenomenon, and the operation based on personal experience is subjective and arbitrary. The monitoring and control of vibration quality is largely affected by human factors and working conditions. It is difficult to avoid the problem of missed vibration caused by the deviation of the insertion position of the vibrating rod, which is easy to produce quality defects and difficult to know and deal with quality defects in time. In order to solve the existing problems, technical personnel in the industry proposed to detect the rotation angle of the vibrator turntable as a data basis for the later statistics and analysis of the vibration points, over-vibration, under-vibration, and missed vibration.

[0004] In order to obtain the rotation angle (angular displacement) value of the vibrator turntable, a vibrator angle measuring device based on encoders, pull-wire sensors and other equipment has been developed. This technical means can realize the conversion of angular displacement into electrical signals. Combined with the control unit and the display unit, the rotation angle of the vibrator can be intuitively displayed and recorded.

[0005] However, there are still some problems with this type of measuring device in actual application. First, its application environment is harsh, and it has high requirements for waterproof and anti-fouling properties. However, the pull-wire sensor is a mechanical sensor with a large size. It is difficult to find practical and effective protection measures during the design process. Only local protection can be provided for its key components, and it cannot be fully sealed. The vibrator of the vibrating truck has been in service in concrete mud conditions for a long time. In mud conditions, the measuring device with the outer surface directly exposed is very easy to be contaminated, causing mechanical jamming and equipment failure. Moreover, after the on-site construction is completed, a high-pressure water column is generally used to flush and clean the vibrator of the vibrating truck. The water flow can easily enter the sensor and cause the electronic devices to become damp and short-circuited. The waterproof and anti-fouling capabilities of the existing measuring devices are difficult to adapt to the current harsh environment.

[0006] Secondly, there are oil pipes, wires and other components arranged around the vibrator, and there are obstacles such as steel bars and templates on the vibrating chamber surface. When the vibrating arm is extended or retracted or the vibrator is rotated, the detection device arranged on the vibrator is very susceptible to collision and scratching, causing damage. Although the existing protective device can reduce the probability of key components being hit to a certain extent, it also further occupies limited space for installation, and it is difficult to avoid scratching of the protective device itself. The anti-collision capability of the existing measuring device urgently needs to be improved.

[0007] In addition, conventional measuring devices have many installation components and low integration, and require a large number of screws for installation. Since the original installation holes on the vibrator have low utilization rate, drilling and other operations are required before installation, which increases the difficulty of disassembly, assembly and maintenance of the measuring device. Summary of the invention

[0008] The technical purpose of the present invention is to provide a sealed rotation angle measuring device for a vibrator of a vibrating vehicle, which is simple to install, waterproof and anti-fouling, in view of the deficiencies of the above-mentioned prior art and in combination with the application technology of Hall sensors.

[0009] The technical solution adopted by the present invention to achieve its purpose is:

[0010] A vibrator rotation angle measuring device for a concrete vibrator, wherein the vibrator has a fixed plate and a rotating plate corresponding to each other, the rotating plate has a plurality of vibrating rods, and the rotating plate can rotate relative to the fixed plate; the vibrator rotation angle measuring device comprises:

[0011] A magnet, fixed to the rim of the vibrator turntable;

[0012] A plurality of Hall sensors are evenly distributed on the circumference of the vibrator fixed disk to form an angle scale, and each Hall sensor represents the angle value corresponding to its position on the circumference of the fixed disk;

[0013] The signal processor is used to display and record the angle value represented by the Hall sensor.

[0014] The Hall sensor is encapsulated in a flexible protective band, and the flexible protective band is coated on the circumference of the vibrator fixing disk.

[0015] The flexible protection strip further comprises: a flexible bottom plate for carrying the Hall sensor, and a flexible sleeve sleeved on the outer periphery of the flexible bottom plate.

[0016] Both ends of the flexible protective belt are spirally wrapped sealing structures.

[0017] The Hall sensor comprises a sensing sheet and a lead wire, which are connected by a gold finger transition. The sensing sheet is embedded in the Hall sensor, and the lead wire is welded on the gold finger.

[0018] The Hall sensor is provided with an indicator light.

[0019] The beneficial technical effects of the present invention are:

[0020] 1. The present invention installs a magnet on the rotating body of the vibrator of the vibrator. When the vibrator of the vibrator rotates, the magnet is driven to rotate. When the magnet is close to the Hall sensor, the Hall sensor outputs a voltage signal. Each voltage signal is connected to each port of the signal processor via a data bus. An independent number is defined for each Hall sensor inside the processor, corresponding to a different rotation angle. When a certain port collects a voltage signal, the current rotation angle of the vibrator of the vibrator is determined by comparing the relationship between the Hall sensor number and the rotation angle, thereby realizing the measurement of any rotation angle within a 360-degree range of the vibrator of the vibrator.

[0021] 2. All components of the present invention are integrally encapsulated in the flexible protective belt, with high integration, which reduces the probability of the rotation angle measuring belt being hit or scratched during the extension and retraction of the vibrating arm or the rotation of the vibrator; at the same time, the two ends of the flexible protective belt (rotation angle measuring belt) are spirally wrapped sealing structures, which effectively prevent the internal electrical components of the flexible protective belt from being affected by mud during use, and ensure that the flexible protective belt does not get water in the process of cleaning the vibrator of the vibrator, so that the flexible protective belt can adapt to various harsh outdoor use environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of an installation structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the deployment of the flexible protection belt of the present invention.

[0024] Figure 3 yes Figure 2 Cross-sectional view of the flexible protective strip in the direction of A.

[0025] Figure 4 yes Figure 2 An enlarged cross-sectional view of the flexible sleeve head end 131 structure in the CC direction.

[0026] Figure 5 yes Figure 2 An enlarged cross-sectional view of the flexible sleeve tail end 133 structure along the BB direction.

[0027] Figure 6 yes Figure 3 An enlarged schematic diagram of the structure of the front side 113 of the FPC flexible circuit board.

[0028] Figure 7 yes Figure 3 An enlarged schematic diagram of the structure of the back side 114 of the FPC flexible circuit board.

[0029] Meaning of the codes in the figure:

[0030] 1—Flexible protective belt (rotation angle measurement belt); 2—Magnet; 3—L-shaped bracket;

[0031] 11—Flexible base plate (FPC flexible circuit board); 111—Flexible main board; 112—Flexible sensor board; 1121—Hall sensor; 1122—Indicator light; 113—FPC flexible circuit board front; 114—FPC flexible circuit board back; 115—Gold finger; 116—Support board; a—Signal processor;

[0032] 12—Insulation lining;

[0033] 13—flexible sleeve; 131—head end of flexible sleeve; 132—middle part of flexible sleeve; 1321—sensing surface of flexible protective belt; 1322—installation surface of flexible protective belt; 133—tail end of flexible sleeve;

[0034] 14—Waterproof connector;

[0035] 15—flexible mounting part; 151—self-adhesive surface; 152—rough surface. DETAILED DESCRIPTION

[0036] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings:

[0037] like Figures 1 to 7 As shown, the present invention is a vibrator rotation angle measuring device for a concrete vibrator, wherein the vibrating device has a fixed disk and a rotating disk corresponding to each other, and the rotating disk has a plurality of vibrating rods, and the rotating disk can rotate relative to the fixed disk; the vibrator rotation angle measuring device comprises: a magnet 2 fixed on the rim of the vibrator rotating disk; a plurality of Hall sensors 1121 evenly distributed on the circumference of the vibrator fixed disk, forming an angle scale, and each Hall sensor 1121 respectively represents the angle value corresponding to its position on the circumference of the fixed disk; a signal processor a, used to display and record the angle value represented by the Hall sensor 1121. The rotating disk also comprises an L-shaped bracket 3, which is fixed on the rim of the wheel disk, and a magnet 2 is fixed on the inner side of the bracket 3 and corresponds to the circumference of the fixed disk, and a certain gap is formed between the magnet 2 and the circumference of the fixed disk. The rotation angle measuring device comprises a flexible protective belt 1, and the Hall sensor 1121 is encapsulated in the flexible protective belt 1 and coated on the circumference of the vibrator fixed disk, and the flexible protective belt 1 is in the shape of an overall flat strip.

[0038] like Figures 2 to 5As shown, the flexible protective belt 1 further includes: a flexible base plate 11 for carrying the Hall sensor 1121, and a flexible sleeve 13 sleeved on the outer periphery of the flexible base plate. The flexible sleeve 13 specifically includes a flexible sleeve head end 131, a flexible sleeve middle part 132, and a flexible sleeve tail end 133. The flexible sleeve is in the shape of a flat strip as a whole, and adopts a transparent heat shrink tube made of EVA material with the characteristics of softness, shock resistance, and pressure resistance. The length of the flexible sleeve 13 is longer than the flexible base plate 11, and a certain length is reserved for the flexible sleeve head end 131 and the flexible sleeve tail end 133, and the specific length is 4cm to 10cm; it is used for sealing treatment later. As shown Figure 4 , Figure 5 As shown, the flexible sleeve head end 131 and the flexible sleeve tail end 133 are both subjected to high temperature heating and then rolled and pressurized to seal, so that the two ends of the flexible sleeve 13 are closed. The two ends of the flexible protective belt 1 are spirally wrapped and sealed.

[0039] The rotation angle measuring device also includes a waterproof connector 14, one end of which is welded to the FPC flexible circuit board 11 through a thin cable wire, and the other end is a plug, and the plug contains a sealing component; the thin cable wire of the waterproof connector 14 is rolled and embedded in the head end 131 of the flexible protective belt for overall sealing to prevent rainwater from flowing downstream. The overall packaging method of the flexible protective belt 1 is combined with the sealing treatment method of the head end 131 and the tail end 133 of the flexible protective belt, which effectively improves its anti-fouling and waterproof capabilities.

[0040] like Figure 3 As shown, the flexible protective strip 1 also includes an insulating liner 12, and the FPC flexible circuit board 11 is clamped in the folded insulating liner 12, and then the whole is set in the flexible protective strip 1, the length is twice that of the FPC flexible circuit board 11, and the width matches the FPC flexible circuit board 11, which mainly reinforces the FPC flexible circuit board 11, and on the other hand, facilitates the implementation of the FPC flexible circuit board 11 through the pipe. The insulating liner 12 is made of a flexible transparent material.

[0041] The rotation angle measuring device also includes a flexible mounting part 15, which includes a molecular part and a mother part. In this embodiment, the molecular part is pasted on the flexible protective belt 1, and the flexible protective belt 1 includes a flexible protective belt sensing surface 1321 and a flexible protective belt mounting surface 1322; the mother part is pasted on the circumferential curved surface of the vibrator fixed body of the vibrator, and one side of the molecular part is a self-adhesive surface 151, which is used to be pasted with the flexible protective belt mounting surface 1322, and the other side is a rough surface 152, which is used to be pasted with the mother part. One side of the mother part is a self-adhesive surface 151, which is used to be pasted with the circumferential curved surface of the vibrator fixed body of the vibrator, and the other side is a hook surface, which is used to be pasted with the molecular part. The molecular part and the mother part can be pasted repeatedly, and the pasting method replaces a large number of screw installations to achieve repeated, fast and stable installation of the flexible protective belt 1. It is suitable for flexible disassembly and assembly of installation surfaces of different shapes, and is particularly suitable for curved surface installation of vibrators.

[0042] like Figure 6 As shown, the flexible base plate 11 is an FPC flexible circuit board, and the flexible base plate 11 includes a flexible main board 111 and multiple flexible sensor boards 112; the connection parts of the flexible main board 111 and the flexible sensor board 112 are all gold fingers 115. The flexible main board 111 is arranged with a signal processor a, and the processor a completes the signal acquisition and angle conversion functions of the Hall sensor 1121, and is used to display and record the angle value represented by the Hall sensor. The signal processor a is a single-chip microcomputer; the flexible sensor board 112 is evenly distributed with a number of Hall sensors 1121, each Hall sensor 1121 has a sensing sheet and a lead wire, the sensing sheet is embedded in the Hall sensor 1121, and the lead wires of the Hall sensor 1121 are respectively connected to the ports of the processor a through the data bus and are transitionally connected using gold fingers 115, and the lead wires are welded on the gold fingers 115. The one-to-one welding of the gold fingers 115 can avoid the loose connection problem caused by the traditional plug-in method and reduce the failure points. All components are distributed on the front side 113 of the FPC flexible circuit board, which has the characteristics of high integration and low failure rate, realizes the integration and centralization of the measuring device, reduces the space occupancy rate, and improves the anti-collision problem.

[0043] The flexible sensor board 112 is provided with indicator lights 1122 corresponding to each Hall sensor 1121, and the number of indicator lights 1122 is consistent with the number of Hall sensors 1121. When the Hall sensor 1121 outputs a voltage signal, the corresponding indicator light 1122 lights up. Combined with the transparent material of the flexible protective strip 1, the debugging personnel can intuitively observe the signal indication of the indicator light, which is convenient for understanding the current working status of the measuring device, facilitating the debugging personnel to troubleshoot problems, and making on-site maintenance more convenient.

[0044] In addition, the number of flexible sensor plates 112 can be increased or decreased according to the circumferential diameter and rotation range of the fixed body of the vibrator of the vibrator vehicle, so that the rotation angle measuring device can be applied to different vibrators of the vibrator vehicle.

[0045] like Figure 7 As shown, a support plate 116 is pasted to the corresponding welding position of each gold finger 115 on the back side 114 of the FPC flexible circuit board to transfer the force point and avoid direct force on the welding position of the gold finger 115 when the FPC flexible circuit board 11 is bent, causing the solder joint to loosen, thereby extending the service life of the circuit board.

[0046] In addition, the flexible protective strip 1 can be pre-circled into an arc shape with reference to the circumferential diameter of the vibrator fixing body of the vibrator vehicle, and heat-shrink-molded to enhance the stability of the FPC flexible circuit board 11 and the insulating liner 12 in the flexible protective strip 1.

[0047] The working principle of the concrete vibrator rotation angle measuring device is as follows:

[0048] When the rotation angle measuring device of the concrete vibrator is working, the turntable drives the magnet 2 to rotate. When the magnet 2 is close to the Hall sensor 1121, the Hall sensor 1121 outputs a voltage signal. Each voltage signal is connected to each port of the signal processor a through the data bus. The processor a defines an independent number for each Hall sensor 1121, which corresponds to a different rotation angle, forming an angle scale. When a certain port collects a voltage signal, the current rotation angle of the vibrator of the vibrator is determined by comparing the relationship between the Hall sensor 1121 number and the rotation angle, realizing the step-by-step measurement of the rotation angle. The step difference is related to the number of Hall sensors. Figure 6 The positions shown are numbered from left to right. According to the rotation angle measurement range θm of the vibrator of the vibrator and the total number Nm of Hall sensors 1121, the increment △ of each Hall sensor 1121 can be calculated. The formula is: △ = θm / Nm. According to the increment, the rotation angle corresponding to the Nth Hall sensor 1121, that is, the current rotation angle θ of the vibrator of the vibrator can be calculated. The formula is: θ = △×(N-1). For example, when the vibrator of the vibrating vehicle rotates a certain angle and then vibrates, a Hall sensor close to magnet 2 senses the magnetic field and outputs a voltage signal. The corresponding port of the processor collects the voltage signal. Since the processor port corresponds to the Hall sensor number one by one, it can be judged according to the port number that the Hall sensor number is 10, that is, the 10th Hall sensor. Assuming that the rotation angle measurement range of the vibrator of the vibrating vehicle is 360 degrees, and the number of Hall sensors 1121 is 180, the angle increment corresponding to each Hall sensor 1121 is 2. According to the formula θ = △×(N-1), it can be calculated that the rotation angle corresponding to the 10th Hall sensor is 18 degrees, that is, the current rotation angle of the vibrator of the vibrating vehicle is 18 degrees.

[0049] The above embodiments are only used to illustrate the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the present invention can still modify the specific technical solutions in the above embodiments, or perform equivalent replacements on some of the technical features therein, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the present invention.

Claims

1. A device for measuring the rotation angle of a concrete vibrator, wherein the vibrator has a fixed plate and a rotating plate corresponding to each other, the rotating plate has a plurality of vibrating rods, and the rotating plate rotates relative to the fixed plate; characterized in that: The vibrator rotation angle measuring device comprises: A magnet, fixed to the rim of the vibrator turntable; A plurality of Hall sensors are evenly distributed on the circumference of the vibrator fixed disk to form an angle scale, and each Hall sensor represents the angle value corresponding to its position on the circumference of the fixed disk; The signal processor is used to display and record the angle value represented by the Hall sensor.

2. The concrete vibrator rotation angle measuring device according to claim 1, characterized in that: The Hall sensor is encapsulated in a flexible protective band, and the flexible protective band is coated on the circumference of the vibrator fixing disk.

3. The concrete vibrator rotation angle measuring device according to claim 2, characterized in that: The flexible protection strip further comprises: a flexible bottom plate for carrying the Hall sensor, and a flexible sleeve sleeved on the outer periphery of the flexible bottom plate.

4. The concrete vibrator rotation angle measuring device according to claim 2, characterized in that: Both ends of the flexible protective belt are spirally wrapped sealing structures.

5. The concrete vibrator rotation angle measuring device according to claim 2, characterized in that: The Hall sensor comprises a sensing sheet and a lead wire, which are connected by a gold finger transition. The sensing sheet is embedded in the Hall sensor, and the lead wire is welded on the gold finger.

6. The concrete vibrator rotation angle measuring device according to claim 2, characterized in that: The Hall sensor is provided with an indicator light.

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