A shore bridge crane tension sensor auxiliary device

Abstract

The invention discloses a tension sensor auxiliary device for a shore bridge crane, comprising a strain gauge signal acquisition unit, a strain gauge signal conditioning circuit and a three-axis acceleration sensor, wherein the strain gauge signal acquisition unit comprises a primary filtering circuit, the primary filtering circuit is connected to the strain gauge signal acquisition unit, the three-axis acceleration sensor comprises a switch capacitor filter, the switch capacitor filter is connected to the three-axis acceleration sensor, and a voltage stabilization module is fixedly connected inside the strain gauge signal acquisition unit. The shore bridge crane tension sensor auxiliary device uses the primary filtering circuit provided inside the strain signal acquisition power supply, takes the hoisting weight as the real data of the lifting system, takes the inertial force as the noise and interference of the system, measures the real object weight by using the Kalman filter, and restores the inertial force in real time by using the instantaneous data of the sensor and the real object weight, thereby correcting the input torque of the system input frequency converter.

Description

Technical Field

[0001] The invention relates to the field of tension sensor auxiliary devices, in particular to a tension sensor auxiliary device for a shore bridge crane. Background Art

[0002] The tension sensor auxiliary device is a device that uses the volumetric Kalman digital filtering algorithm to process the crane wire rope tension measurement data, actively distinguishes the "impact overload" and actual overload data, saves control system resources, and integrates this computing equipment and algorithm into the wire rope lateral pressure sensor, so that the output signal filters the impact overload data, ensuring the use range of the sensor while improving data accuracy and improving the safety of the crane.

[0003] However, the existing tension sensor auxiliary device has a fixed initial output torque of the crane drive system of a specific tonnage, resulting in different inertial forces in the lifting and unloading stages caused by different object weights. Frequent box operations during operation cause frequent changes in sensor data, which poses a major safety hazard. When lifting and unloading loads, the load inertia force will increase the static value of the lifting load and cause elastic vibrations in the wire rope. Summary of the invention

[0004] The purpose of the present invention is to provide a tension sensor auxiliary device for a shore bridge crane to solve the problem that the tension sensor auxiliary device proposed in the above-mentioned background technology has different inertial forces during the lifting and unloading stages of the crane due to different weights of objects, frequent box operations during operation, and frequent changes in sensor data, which brings great safety hazards.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a shore bridge crane tension sensor auxiliary device, comprising a strain gauge signal acquisition unit, a strain gauge signal conditioning circuit and a three-axis acceleration sensor, the strain gauge signal acquisition unit comprising a primary filtering circuit, the three-axis acceleration sensor comprising a switched capacitor filter, a voltage stabilization module fixedly connected to the strain gauge signal acquisition unit, the voltage stabilization module connected to a strain bridge circuit, the strain bridge circuit connected to a voltage follower, the strain gauge signal acquisition unit connected to a strain gauge signal conditioning circuit, the strain gauge signal conditioning circuit connected to a bus interface unit with a microprocessor through an AD / conversion, the three-axis acceleration sensor connected to the bus interface unit through a microprocessor, the three-axis acceleration sensor comprising a secondary amplification circuit, the bus interface unit comprising a slave controller, the slave controller connected to a full-duplex transceiver, and the bus interface unit connected to a bridge crane system bus.

[0006] Furthermore, the strain bridge circuit is connected to the preamplifier circuit, and both the preamplifier circuit and the strain bridge circuit are connected to a power supply.

[0007] Further, the strain gauge signal conditioning circuit is connected to the A / D converter, and the strain gauge signal conditioning circuit and the A / D converter are connected in series.

[0008] Furthermore, the three-axis acceleration sensor is connected to a microprocessor, and the microprocessor has three-way connections, namely A / D conversion, bus interface unit and three-axis acceleration sensor.

[0009] Furthermore, the three-axis acceleration sensor includes a program-controlled amplifier, and the program-controlled amplifier is connected to the A / D conversion circuit.

[0010] Furthermore, the bus interface unit includes a crystal oscillator circuit, and the crystal oscillator circuit is connected in series to the slave station controller.

[0011] Furthermore, the slave controller is connected to a high-speed photoelectric isolation circuit, and the high-speed photoelectric isolation circuit connects the slave controller and the full-duplex transceiver in series.

[0012] Furthermore, the full-duplex transceiver is connected to a bus physical interface, and the bus physical interface connects the full-duplex transceiver and the bridge crane control system bus.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This kind of shore bridge crane tension sensor auxiliary device uses the primary filtering circuit set inside the strain signal acquisition power supply to take the weight of the hoisting weight as the real data of the lifting system and the inertial force as the noise and interference of the system. It uses Kalman filtering to measure the real object weight, and restores the inertial force in real time through the instantaneous data of the sensor and the real object weight, thereby correcting the input torque of the system input frequency converter and fundamentally weakening the effect of the impact of the hoisting power.

[0015] 2. This type of shore bridge crane tension sensor auxiliary device uses a switched capacitor filter inside the three-axis acceleration sensor. According to the analysis in the previous Kalman filter algorithm, the inertial force is used as the disturbance of the object's gravity. The two are separated through the algorithm, so that the effect of the inertial force component on the wire rope is obtained according to the instantaneous angle value of the three-axis acceleration sensor.

[0016] 3. This type of shore bridge crane tension sensor auxiliary device can increase the signal strength of the speed analog signal on the three-axis acceleration sensor by a certain amount through the programmable amplifier provided inside the three-axis acceleration sensor, so that the analog signal can be maintained at a larger intensity after being converted by the A / D conversion circuit, which can reduce the recognition burden of the microprocessor, thereby making it easier for the microprocessor to recognize.

[0017] 4. This type of shore bridge crane tension sensor auxiliary device can convert the analog signal transmitted from the strain gauge signal conditioning circuit into a digital signal through A / D conversion. In this way, when the digital signal is sent to the microprocessor, the microprocessor can process the data. Therefore, the A / D conversion plays a role in converting the signal for the microprocessor and keeping the signal uniform.

[0018] 5. This kind of shore crane tension sensor auxiliary device can produce the clock frequency required by the microprocessor by combining with the circuit inside the microprocessor through the crystal oscillator circuit provided inside the bus interface unit. Moreover, all the normal working instructions of the microprocessor are based on this. Therefore, the crystal oscillator circuit creates the prerequisite for the operation of the microprocessor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall workflow of the present invention;

[0020] Figure 2 It is a schematic diagram of the working process of the strain gauge signal acquisition unit of the present invention;

[0021] Figure 3 It is a schematic diagram of the working process of the three-axis acceleration sensor ADXL335 of the present invention;

[0022] Figure 4 It is a schematic diagram of the working process of the PROFIBUS bus interface unit of the present invention.

[0023] In the figure: 1. Strain gauge signal acquisition unit, 101. Voltage stabilization module, 102. Strain bridge circuit, 103. Preamplifier circuit, 104. Primary filtering circuit, 105. Voltage follower, 2. Strain gauge signal conditioning circuit, 3. A / D conversion 4. Microprocessor, 5. Three-axis acceleration sensor, 501. Secondary amplifier circuit, 502. Switch capacitor filter, 503. Programmable amplifier, 504. A / D conversion circuit, 6. Bus interface unit, 601. Crystal oscillator circuit, 602. Slave controller, 603. High-speed optoelectronic isolation circuit, 604. Full-duplex transceiver, 605. Bus physical interface, 7. Bridge crane system bus. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-4The present invention provides a technical solution: a shore bridge crane tension sensor auxiliary device includes a strain gauge signal acquisition unit 1, a strain gauge signal conditioning circuit 2 and a three-axis acceleration sensor 5, the strain gauge signal acquisition unit 1 includes a primary filtering circuit 104, the three-axis acceleration sensor 5 includes a switch capacitor filter 502, a voltage stabilization module 101 is fixedly connected inside the strain gauge signal acquisition unit 1, the voltage stabilization module 101 is connected to a strain bridge circuit 102, the strain bridge circuit 102 is connected to a voltage follower 105, the strain gauge signal acquisition unit 1 is connected to the strain gauge signal conditioning circuit 2, the strain gauge signal conditioning circuit 2 is connected to a bus interface unit 6 with a microprocessor 4 through an AD / conversion 3, the three-axis acceleration sensor 5 is connected to the bus interface unit 6 through the microprocessor 4, the three-axis acceleration sensor 5 includes a secondary amplification circuit 501 inside, the bus interface unit 6 includes a slave controller 602, the slave controller 602 is connected to a full-duplex transceiver 604, and the bus interface unit 6 is connected to a bridge crane system bus 7.

[0026] Furthermore, the strain bridge circuit 102 is connected to the preamplifier circuit 103, and the preamplifier circuit 103 and the strain bridge circuit 102 are both connected to a power supply. Through the preamplifier circuit 103, the analog signal of the crane rope tension data collected by the strain gauge signal acquisition unit 1 can be amplified, so that the primary filtering circuit 104 can filter the noise of the amplified analog signal, thereby facilitating the elimination of signal noise and interference collected by the strain gauge signal acquisition unit 1.

[0027] Furthermore, the strain gauge signal conditioning circuit 2 is connected to the A / D converter 3, and the strain gauge signal conditioning circuit 2 and the A / D converter 3 are connected in series. Through the A / D converter 3, the analog signal transmitted from the strain gauge signal conditioning circuit 2 can be converted into a digital signal. In this way, when the digital signal is sent to the microprocessor 4, the microprocessor 4 can process the data. Therefore, the A / D converter 3 plays a role in converting the signal for the microprocessor 4 and keeping the signal uniform.

[0028] Furthermore, the three-axis acceleration sensor 5 is connected to the microprocessor 4, and the microprocessor 4 has three-way connections, namely the A / D converter 3, the bus interface unit 6 and the three-axis acceleration sensor 5. Through the microprocessor 4, the digital signal sent from the A / D converter 3 can be processed, and then corresponding work instructions can be issued to other components based on the information, thereby coordinating the work between the various components.

[0029] Furthermore, the three-axis acceleration sensor 5 includes a programmable amplifier 503, and the programmable amplifier 503 is connected to the A / D conversion circuit 504. Through the programmable amplifier 503, the signal strength of the speed analog signal on the three-axis acceleration sensor 5 can be amplified by a certain amount, so that the analog signal can be maintained at a larger intensity after being converted by the A / D conversion circuit 504, which can reduce the recognition burden of the microprocessor 4, thereby making it easier for the microprocessor 4 to recognize.

[0030] Furthermore, the bus interface unit 6 includes a crystal oscillator circuit 601, and the crystal oscillator circuit 601 is connected in series to the slave station controller 602. Through the crystal oscillator circuit 601, the circuit inside the microprocessor 4 can be combined to produce the clock frequency required by the microprocessor 4. Moreover, all normal working instructions of the microprocessor 4 are based on this. Therefore, the crystal oscillator circuit 601 creates a prerequisite for the operation of the microprocessor 4.

[0031] Furthermore, the slave station controller 602 is connected to a high-speed optoelectronic isolation circuit 603, and the high-speed optoelectronic isolation circuit 603 connects the slave station controller 602 and the full-duplex transceiver 604 in series. Through the high-speed optoelectronic isolation circuit 603, the noise and interference on the auxiliary device can be isolated from those normal data, and the medium that introduces the interference can be cut off to prevent these interferences from affecting the data, thereby achieving the effect of isolating on-site interference.

[0032] Furthermore, the full-duplex transceiver 604 is connected to the bus physical interface 605, and the bus physical interface 605 connects the full-duplex transceiver 604 and the bridge crane control system bus 7. Through the bus physical interface 605, when the bus physical interface 605 is inserted into the bridge crane system bus 7, the signal transmission instrument bridge crane system of the entire sensor auxiliary device can be connected together, so that data transmission can be formed with the bridge crane system, thereby fundamentally optimizing the effect of the crane.

[0033] Working principle: First, the crane lifts the heavy object. At this time, the lateral pressure sensor measures the component of the axial pressure in the form of the angle of the wire rope. At the same time, the strain gauge signal acquisition unit 1 on the sensor auxiliary device collects the tension analog information on the lateral pressure sensor. Then, the strain gauge signal conditioning circuit 2 processes the collected analog signal. Then, the A / D converter 3 converts the analog signal into a digital signal. At the same time, the primary filtering circuit 104 uses the gravity of the lifting weight as the real data of the lifting system and the inertial force as the noise and interference of the system. The real object weight is measured by Kalman filtering, and the inertial force is restored in real time through the instantaneous data of the sensor and the real object weight. At the same time, the three-axis acceleration sensor 5 uses the inertial force as the disturbance of the object weight according to the analysis in the previous Kalman filtering algorithm. The two are separated by the algorithm. Then, the data is exchanged with the lateral pressure sensor through the bus interface unit 6 connected to the bridge crane system bus 7.

[0034] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tension sensor auxiliary device for a shore crane, comprising a strain gauge signal acquisition unit (1), a strain gauge signal conditioning circuit (2) and a triaxial acceleration sensor (5), wherein the strain gauge signal acquisition unit (1) comprises a primary filtering circuit (104), and the triaxial acceleration sensor (5) comprises a switched capacitor filter (502), characterized in that: The strain gauge signal acquisition unit (1) is internally fixedly connected with a voltage stabilization module (101), the voltage stabilization module (101) is connected to a strain bridge circuit (102), the strain bridge circuit (102) is connected to a preamplifier circuit (103), and the preamplifier circuit (103) and the strain bridge circuit (102) are both connected to a power supply, the strain bridge circuit (102) is connected to a voltage follower (105), the strain gauge signal acquisition unit (1) is connected to a strain gauge signal conditioning circuit (2), the strain gauge signal conditioning circuit (2) is connected to an A / D converter (3), and the strain gauge signal conditioning circuit (2) and the A / D converter (3) are connected in series, and the strain gauge signal conditioning circuit (2) is connected to a microprocessor through the A / D converter (3). The microprocessor (4) is connected to a bus interface unit (6); the three-axis acceleration sensor (5) is connected to the bus interface unit (6) via the microprocessor (4); the three-axis acceleration sensor (5) includes a program-controlled amplifier (503), and the program-controlled amplifier (503) is connected to an A / D conversion circuit (504); the three-axis acceleration sensor (5) includes a secondary amplifier circuit (501); the bus interface unit (6) includes a slave station controller (602); the bus interface unit (6) includes a crystal oscillator circuit (601), and the crystal oscillator circuit (601) is connected in series to the slave station controller (602); the slave station controller (602) is connected to a full-duplex transceiver (604); and the bus interface unit (6) is connected to a bridge crane system bus (7).

2. The tension sensor auxiliary device of a shore crane according to claim 1, characterized in that: The three-axis acceleration sensor (5) is connected to the microprocessor (4), and the microprocessor (4) has three-way connections, namely, an A / D converter (3), a bus interface unit (6) and the three-axis acceleration sensor (5).

3. The auxiliary device for a tension sensor of a shore crane according to claim 1, characterized in that: The slave station controller (602) is connected to a high-speed photoelectric isolation circuit (603), and the high-speed photoelectric isolation circuit (603) connects the slave station controller (602) and the full-duplex transceiver (604) in series.

4. The tension sensor auxiliary device of a shore crane according to claim 1, characterized in that: The full-duplex transceiver (604) is connected to the bus physical interface (605), and the bus physical interface (605) connects the full-duplex transceiver (604) and the bridge crane control system bus (7).

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