Digital rolling force measuring instrument with eccentric load detection function

Abstract

The present invention provides a digital rolling force measuring instrument with an eccentric load detection function, which relates to the field of rolling technology. The measuring instrument includes a dynamometer and a secondary instrument. The dynamometer includes multiple force measuring units; each force measuring unit is provided with a first-type hole and four second-type holes, and four resistance strain gauges are pasted in the first-type holes; the four strain gauges are connected to form a Wheatstone bridge, and the strain gauges with the same force measuring direction are connected to form the diagonal ends of the bridge. The terminals between the first and fourth strain gauges and between the second and third strain gauges are used to receive the bridge excitation voltage signal, and the terminals between the first and second strain gauges and between the fourth and third strain gauges are used to output the bridge output voltage signal. By distributing multiple force measuring units in the dynamometer, the total rolling force can be detected, and whether eccentric load occurs can also be determined. By prepending the instrument circuit to the dynamometer, the problems of attenuation of the resistance strain gauge bridge excitation voltage and interference of the analog signal are eliminated, thereby achieving accurate measurement of the rolling force.

Description

Technical Field

[0001] The present invention relates to the field of rolling technology, and in particular to a rolling force digital measuring instrument with an eccentric load detection function. Background Art

[0002] Metal sheets are rolled in rolling mills. The rolling force of the sheet is a crucial parameter in production. The sensor that measures this rolling force is called a dynamometer. Installed within the mill housing, it directly withstands the rolling force and converts it into an electrical signal. Due to the constraints of the working environment, the dynamometer is a flat structure with a vertical height of approximately 74mm. It features high overload capacity, durability, and fast response time.

[0003] Currently, most rolling force dynamometers use a strain gauge. The component that carries the rolling force in the dynamometer is called an elastomer, and a strain gauge is mounted inside the elastomer. When the elastomer deforms under force, the resistance of the strain gauge changes accordingly, providing a measure of the rolling force. Because the rolling forces during sheet metal production are extremely high, the elastomer needs to have a high load-bearing capacity and overload capability.

[0004] Usually at steel rolling production sites, the dynamometer is connected to the secondary instrument through a cable one or two hundred meters long, which may cause the resistance strain gauge bridge excitation voltage to attenuate and the analog signal to be interfered with.

[0005] Due to factors such as imperfect rolling mill structural design, deformation of the equalizing plate, and uneven installation, the rolling force cannot be evenly transmitted to the working surface of the dynamometer, causing the dynamometer to be overloaded. This will not only affect the measurement accuracy of the rolling force, but also, in severe cases, damage the dynamometer and the rolling mill. Summary of the Invention

[0006] The purpose of the present invention is to provide a digital rolling force measuring instrument with an eccentric load detection function to solve the problem of accurate measurement of rolling force in view of the above-mentioned deficiencies in the prior art.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] The present invention provides a digital rolling force measuring instrument with an eccentric load detection function, the digital measuring instrument includes a dynamometer and a secondary instrument, the dynamometer is used to obtain force value data and send it to the secondary instrument, and the secondary instrument is used to send calibration instructions to the dynamometer;

[0009] The dynamometer includes a plurality of force measuring cells, a plurality of signal amplifiers, and a processing unit. Each of the plurality of force measuring cells is used to output a force value signal. Each of the plurality of force measuring cells is connected to a corresponding signal amplifier, which is connected to the processing unit. The processing unit is connected to a secondary instrument via a communication module.

[0010] The elastic body of the dynamometer has a flat structure. Each force measuring unit is provided with a first-type hole and four second-type holes extending in the same direction. The diameter of the first-type hole is larger than the diameter of the second-type hole. The depth of each of the first-type hole and the second-type hole is shorter than the width of the elastic body. The four second-type holes are evenly distributed around the first-type hole. Four identical resistance strain gauges are adhered in the first-type hole. The four resistance strain gauges include a first resistance strain gauge, a second resistance strain gauge, a third resistance strain gauge and a fourth resistance strain gauge. The first resistance strain gauge and the third resistance strain gauge are arranged on the upper and lower sides of the first-type hole. The first resistance strain gauge and the third resistance strain gauge are used to measure the horizontal strain of the elastic body. The second resistance strain gauge and the fourth resistance strain gauge are arranged on the left and right sides of the first-type hole. The second resistance strain gauge and the fourth resistance strain gauge are used to measure the vertical strain of the elastic body.

[0011] The four resistance strain gauges in the same first-type hole are connected to form a Wheatstone bridge, and the resistance strain gauges with the same force measuring direction are connected to the diagonals of the bridge. In the bridge, the terminal between the first resistance strain gauge and the fourth resistance strain gauge and the terminal between the second resistance strain gauge and the third resistance strain gauge are used to receive the bridge excitation voltage signal, and the terminal between the first resistance strain gauge and the second resistance strain gauge and the terminal between the fourth resistance strain gauge and the third resistance strain gauge are used to output the bridge output voltage signal.

[0012] Optionally, the processing unit includes multiple ADC modules and an MCU module, and each signal amplifier is connected to a corresponding ADC module among the multiple ADC modules.

[0013] Optionally, the vertical height of the elastic body is 74 mm.

[0014] Optionally, the number of force measuring units is 3.

[0015] Optionally, a strip groove is provided on the surface of the elastic body at a position between two adjacent force measuring units among the plurality of force measuring units, and an extending direction of the strip groove is the same as an extending direction of the first type of hole.

[0016] Optionally, each test unit in the force gauge is calibrated independently, and any uncalibrated force unit is selected from the plurality of force units as a designated force unit. The calibration process of the force unit includes the following steps:

[0017] Step A: Each test unit in the dynamometer is unloaded;

[0018] Step B: The secondary instrument sends a record zero point instruction to the dynamometer;

[0019] Step C, applying rated pressure to the designated force measuring unit;

[0020] Step D: The secondary instrument sends an instruction to the dynamometer to designate the force measuring unit to record the rated point, and the calibration of the designated force measuring unit is completed;

[0021] Step E: If all force measuring units are calibrated, the calibration process ends. If there are uncalibrated force measuring units, any one of the uncalibrated force measuring units is used as a designated force measuring unit, and steps C to D are executed.

[0022] The beneficial effects of the present invention include:

[0023] The digital rolling force measuring instrument with an eccentric load detection function provided by the present invention includes a dynamometer and a secondary instrument, the dynamometer is used to obtain force value data and send it to the secondary instrument, and the secondary instrument is used to send calibration instructions to the dynamometer; the dynamometer includes multiple force measuring units, multiple signal amplifiers and a processing unit, each of the multiple force measuring units is used to output a force value signal, each of the multiple force measuring units is connected to a corresponding signal amplifier, the signal amplifier is connected to the processing unit, and the processing unit is communicatively connected to the secondary instrument via a communication module; the elastic body of the dynamometer is a flat structure, and each force measuring unit is provided with a first type hole and four second type holes with the same extension direction, the diameter of the first type hole is larger than the diameter of the second type hole, the depth of each hole in the first type hole and the second type hole is shorter than the width of the elastomer, the four second type holes are evenly distributed around the first type hole, and four identical resistance strain gauges are pasted in the first type hole, and the four resistance strain gauges are pasted in the first type hole. The gauge includes a first resistance strain gauge, a second resistance strain gauge, a third resistance strain gauge and a fourth resistance strain gauge. The first resistance strain gauge and the third resistance strain gauge are arranged on the upper and lower sides of the first type of hole. The first resistance strain gauge and the third resistance strain gauge are used to measure the horizontal strain of the elastic body. The second resistance strain gauge and the fourth resistance strain gauge are arranged on the left and right sides of the first type of hole. The second resistance strain gauge and the fourth resistance strain gauge are used to measure the vertical strain of the elastic body. The four resistance strain gauges in the same first type of hole are connected to form a Wheatstone bridge, and the resistance strain gauges with the same force measuring direction are connected to the diagonals of the bridge. In the bridge, the terminal between the first resistance strain gauge and the fourth resistance strain gauge and the terminal between the second resistance strain gauge and the third resistance strain gauge are used to receive the bridge excitation voltage signal, and the terminal between the first resistance strain gauge and the second resistance strain gauge and the terminal between the fourth resistance strain gauge and the third resistance strain gauge are used to output the bridge output voltage signal. Multiple force measuring units are distributed within the dynamometer, each independently outputting a force signal. When connected to a secondary instrument, the dynamometer can not only detect the total rolling force, but also determine its distribution on the dynamometer, allowing for the determination of any unbalanced loading. By prepending the instrument circuit to the dynamometer and connecting the dynamometer and secondary instrument via communication, the problems of voltage attenuation in the resistance strain gauge bridge excitation and analog signal interference are eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 The schematic diagram of the rolling force digital measuring instrument with eccentric load detection function provided by an embodiment of the present invention is shown;

[0026] Figure 2A A schematic diagram of the three-dimensional structure of a dynamometer provided in an embodiment of the present invention is shown;

[0027] Figure 2B Shown Figure 2A A front view of the dynamometer provided in;

[0028] Figure 2C Shown Figure 2B An enlarged view of a force cell of a dynamometer provided in;

[0029] Figure 2D Shown Figure 2A A top view of the dynamometer provided in;

[0030] Figure 2E Shown Figure 2D AA cross-section diagram in;

[0031] Figure 2F Shown Figure 2E BB cross-section diagram in;

[0032] Figure 3 A circuit diagram of a Wheatstone bridge formed by connecting four resistance strain gauges in a force measuring unit provided by an embodiment of the present invention is shown;

[0033] Figure 4 A schematic diagram of the calibration process of a force measuring unit provided in an embodiment of the present invention is shown.

[0034] Figure markings: 100 - elastomer; 101 - first type of hole; 121, 122, 123, 124 - second type of hole; 131 - first resistance strain gauge; 132 - second resistance strain gauge; 133 - third resistance strain gauge; 134 - fourth resistance strain gauge; 141 - first upper working surface; 142 - second upper working surface; 143 - third upper working surface; 105 - strip groove. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] Currently, most rolling force dynamometers use a strain gauge. The component in the dynamometer that carries the rolling force is called an elastomer, and a strain gauge is mounted within the elastomer. When the dynamometer is subjected to force and the elastomer deforms, the resistance of the strain gauge changes accordingly, thereby determining the rolling force. Because the rolling forces during sheet metal production are extremely high, the elastomer must have a high load-bearing capacity and overload capability. Typically, at steel rolling production sites, the dynamometer is connected to secondary instrumentation via cables that are one to two hundred meters long. This can lead to voltage attenuation across the strain gauge bridge excitation and interference with the analog signal. Due to factors such as imperfect mill structural design, deformation of the equalizing plate, and uneven installation, rolling force is not evenly transmitted to the dynamometer's working surface, resulting in uneven loading of the dynamometer. This not only affects the accuracy of rolling force measurement but, in severe cases, can damage the dynamometer and the rolling mill. Therefore, a new digital rolling force measuring instrument is needed. The present invention aims to solve the problems of uneven force on the rolling force dynamometer, eccentric load, long cables between the dynamometer and secondary instrument, attenuation of excitation voltage and interference of analog signals. A digital rolling force measurement system with eccentric load detection function is proposed.

[0037] Figure 1 FIG1 shows a schematic diagram of a rolling force digital measuring instrument with an eccentric load detection function provided by an embodiment of the present invention. Figure 1 As shown, the digital rolling force measuring instrument with eccentric load detection function provided by the present invention includes a dynamometer and a secondary instrument. The dynamometer is used to obtain force value data (the data comes from the force measuring unit) and send it to the secondary instrument. The secondary instrument is used to send calibration instructions to the dynamometer.

[0038] The dynamometer includes multiple force measuring units, multiple signal amplifiers (i.e. Figure 1 ) and a processing unit, each of the multiple force measuring cells is used to output a force value signal, each of the multiple force measuring cells is connected to a corresponding signal amplifier, the signal amplifier is connected to the processing unit, and the processing unit is connected to the secondary instrument via a communication module. The communication connection here is a bidirectional data transmission connection. Optionally, the processing unit includes a plurality of ADC modules (that is, analog-to-digital converter modules) and an MCU module (that is, a processing chip MCU), and each signal amplifier is connected to a corresponding ADC module among the multiple ADC modules. In the processing unit, the multiple ADC modules are connected to the MCU module in the processing unit.

[0039] like Figure 1 As shown, the secondary instrument may include a display module, a DAC output module, a digital IO module, and a processing chip MCU. In the secondary instrument, the display module, the DAC output module, and the digital IO module are all connected to the processing chip MCU. The processing chip MCU of the secondary instrument is communicated with the MCU module in the processing unit via the communication module.

[0040] Alternatively, for example, Figure 1 As shown, the number of force measuring units is 3, and the force measuring units include Figure 1 The force measuring unit A, force measuring unit B and force measuring unit C are shown in FIG. It should be understood that the force measuring units may be of other numbers depending on the size of the force measuring unit. For example, when the rolling force dynamometer is longer, more groups of force measuring units may be added, and the rolling force measurement system may still be arranged in the manner shown in the present invention. Figure 1 As shown, the plurality of force measuring units are evenly arranged along the length direction of the elastic body (as described below).

[0041] Figure 2A A schematic diagram of the three-dimensional structure of a dynamometer provided in an embodiment of the present invention is shown; Figure 2B Shown Figure 2A A front view of the dynamometer provided in; Figure 2C Shown Figure 2B An enlarged view of a force cell of a dynamometer provided in; Figure 2D Shown Figure 2A A top view of the dynamometer provided in; Figure 2E Shown Figure 2D AA cross-section diagram in; Figure 2F Shown Figure 2E Schematic diagram of the BB cross section.

[0042] like Figure 2A As shown, the elastic body 100 of the dynamometer is a flat structure. Optionally, the height of the elastic body 100 is about 74 mm, for example, the height of the elastic body 100 can be equal to 74 mm.

[0043] Each force measuring unit is provided with a first type hole 101 (i.e. Figure 2A The large pores in the Figure 2A The second type of holes include the second type of holes 121, the second type of holes 122, the second type of holes 123 and the second type of holes 124. The diameters and depths of the four second type of holes are the same. The diameter of the first type of holes 101 is larger than the diameter of the second type of holes. The depth of each hole in the first type of holes 101 and the second type of holes is shorter than the width of the elastomer 100 (e.g., Figure 2F As shown, the depth of each of the first and second type holes 101 is the same. The four second type holes (i.e., second type holes 121, second type holes 122, second type holes 123, and second type holes 124) are evenly distributed around the first type hole 101. By evenly distributing the four small holes (i.e., the four second type holes) around the large hole (i.e., first type hole 101), stress is dispersed, ensuring a uniform stress distribution in the area of ​​the large hole where the strain gauge is bonded, ensuring that the strain gauge and the elastic body deform equally.

[0044] Four identical resistance strain gauges are pasted in the first type of hole 101, such as Figure 2B As shown, the four resistance strain gauges include a first resistance strain gauge 131, a second resistance strain gauge 132, a third resistance strain gauge 133, and a fourth resistance strain gauge 134. The first resistance strain gauge 131 and the third resistance strain gauge 133 are arranged on the upper and lower sides of the first type of hole 101. The first resistance strain gauge 131 and the third resistance strain gauge 133 are used to measure the strain of the elastic body 100 in the horizontal direction (i.e., the X direction). The resistance value of the strain gauge increases when it is under tension. The second resistance strain gauge 132 and the fourth resistance strain gauge 134 are arranged on the left and right sides of the first type of hole 101. The second resistance strain gauge 132 and the fourth resistance strain gauge 134 are used to measure the strain of the elastic body 100 in the vertical direction (i.e., the Y direction). The resistance value of the strain gauge decreases when it is under pressure.

[0045] The four resistance strain gauges in the same first-type hole 101 are connected to form a Wheatstone bridge. The resistance of the first resistance strain gauge 131 is represented by R1, the resistance of the second resistance strain gauge 132 is represented by R2, the resistance of the third resistance strain gauge 133 is represented by R3, and the resistance of the fourth resistance strain gauge 134 is represented by R4. Figure 3 As shown, the resistance strain gauges with the same force measuring direction are connected to form the diagonal bridge. Specifically, the first resistance strain gauge 131 and the second resistance strain gauge 132 are connected to form the upper and lower bridge arms on the left side of the bridge, and the fourth resistance strain gauge 134 and the third resistance strain gauge 133 are connected to form the upper and lower bridge arms on the right side of the bridge. In the bridge, the connection terminal between the first resistance strain gauge 131 and the fourth resistance strain gauge 134 and the connection terminal between the second resistance strain gauge 132 and the third resistance strain gauge 133 are used to receive the bridge excitation voltage signal U E The connection terminal between the first resistance strain gauge 131 and the second resistance strain gauge 132 and the connection terminal between the fourth resistance strain gauge 134 and the third resistance strain gauge 133 are used to output the bridge output voltage signal U O When the elastic body 100 is unloaded (ie, not under pressure), the resistance values ​​of R1, R2, R3, and R4 are all the same. In the initial state where the rolling force dynamometer is not under pressure, U OWhen the rolling force dynamometer is compressed, the X-direction resistance strain gauges R1 and R3 are pulled and increased, while the Y-direction resistance strain gauges R2 and R4 are compressed and reduced, making the output voltage U O changes, that is, the voltage U O Represents the force signal received by the rolling force dynamometer.

[0046] After the secondary instrument receives the force data of each force measuring unit from the dynamometer, it sums them up to obtain the total rolling force. Since the dynamometer includes multiple force measuring units, it can judge whether the dynamometer is overloaded based on the force distribution of each force measuring unit, and issue an alarm signal accordingly to ensure the normal operation of the rolling mill system.

[0047] The dynamometer features multiple force-measuring units, each independently outputting a force signal. When connected to a secondary instrument, the dynamometer can not only detect the total rolling force, but also its distribution on the dynamometer, allowing for the determination of eccentric loading. This allows for the detection of eccentric loading. By pre-installing the instrument circuit within the dynamometer and connecting the dynamometer and secondary instrument via communication, the problems of voltage attenuation in the resistance strain gauge bridge excitation and analog signal interference are eliminated, enabling accurate measurement of rolling force.

[0048] Alternatively, as Figure 1 As shown, a strip groove 105 is provided on the surface of the elastic body 100 between two adjacent force measuring units among the plurality of force measuring units. The extending direction of the strip groove 105 is the same as the extending direction of the first type of hole 101. By providing the strip groove 105, the influence of the force in any area on the upper working surface of the elastic body 100 on the force measuring units in other areas can be reduced, thereby facilitating a more accurate judgment of the unbalanced load situation. For example, Figure 1 In the figure, the upper pressure surface of the elastic body 100 is divided into three upper working surfaces by two strip grooves 105, including: a first upper working surface 141 corresponding to the force measuring unit on the left, a second upper working surface 142 corresponding to the force measuring unit in the middle, and a third upper working surface 143 corresponding to the force measuring unit on the right.

[0049] Each test cell in the dynamometer is calibrated individually. Figure 4 The schematic diagram of the calibration process of the force measuring unit provided by the embodiment of the present invention is shown. From the multiple force measuring units in the force measuring meter, any uncalibrated force measuring unit is selected as the designated force measuring unit. The calibration process of the force measuring unit includes the following steps: Step A, each test unit in the force measuring meter is unloaded; Step B, the secondary instrument sends a record zero point instruction to the force measuring meter; Step C, the designated force measuring unit (that is, Figure 4In step D, the secondary instrument sends an instruction to the force gauge to designate the force unit to record the rated point, and the calibration of the designated force unit is completed; in step E, if the calibration of all the force units is completed, the calibration process is terminated. If there are uncalibrated force units, any one of the uncalibrated force units is used as the designated force unit, and steps C to D are executed.

[0050] In summary, by pre-placing the instrument circuit inside the dynamometer, the rolling force can be measured in different areas; the dynamometer and the secondary instrument are connected by communication, which has strong anti-interference ability and eliminates the problems of bridge excitation voltage attenuation and analog signal interference when the dynamometer and the secondary instrument are connected through a cable of one or two hundred meters long; the measurement system can not only obtain the total rolling force, but also the distribution of the rolling force, and has the characteristic of detecting overload.

[0051] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable ordinary technicians in this field to understand the content of the present invention and implement it. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A digital rolling force measuring instrument with eccentric load detection function, characterized in that: The digital measuring instrument includes a dynamometer and a secondary instrument, wherein the dynamometer is used to obtain force value data and send it to the secondary instrument, and the secondary instrument is used to send a calibration instruction to the dynamometer; The force gauge includes a plurality of force measuring cells, a plurality of signal amplifiers, and a processing unit, each of the plurality of force measuring cells is used to output a force value signal, each of the plurality of force measuring cells is connected to a corresponding signal amplifier, the signal amplifier is connected to the processing unit, and the processing unit is communicatively connected to the secondary instrument via a communication module; The elastic body of the dynamometer is a flat structure, and each force measuring unit is provided with a first-type hole and four second-type holes extending in the same direction. The diameter of the first-type hole is larger than the diameter of the second-type hole, and the depth of each of the first-type hole and the second-type hole is shorter than the width of the elastic body. The four second-type holes are evenly distributed around the first-type hole. Four identical resistance strain gauges are adhered in the first-type hole. The four resistance strain gauges include a first resistance strain gauge, a second resistance strain gauge, a third resistance strain gauge and a fourth resistance strain gauge. The first resistance strain gauge and the third resistance strain gauge are arranged on the upper and lower sides of the first-type hole. The first resistance strain gauge and the third resistance strain gauge are used to measure the horizontal strain of the elastic body. The second resistance strain gauge and the fourth resistance strain gauge are arranged on the left and right sides of the first-type hole. The second resistance strain gauge and the fourth resistance strain gauge are used to measure the vertical strain of the elastic body. The four resistance strain gauges in the same first-class hole are connected to form a Wheatstone bridge, and the resistance strain gauges with the same force measuring direction are connected to the diagonals of the bridge. In the bridge, the terminal between the first resistance strain gauge and the fourth resistance strain gauge and the terminal between the second resistance strain gauge and the third resistance strain gauge are used to receive the bridge excitation voltage signal, and the terminal between the first resistance strain gauge and the second resistance strain gauge and the terminal between the fourth resistance strain gauge and the third resistance strain gauge are used to output the bridge output voltage signal; the processing unit includes multiple ADC modules and an MCU module, and each signal amplifier is connected to the corresponding ADC module among the multiple ADC modules; the vertical height of the elastic body is 74 mm.

2. The rolling force digital measuring instrument with eccentric load detection function according to claim 1, characterized in that: The number of the force measuring units is 3.

3. The rolling force digital measuring instrument with eccentric load detection function according to claim 2, characterized in that: A strip groove is provided on the surface of the elastic body at a position between two adjacent force measuring units among the plurality of force measuring units, and an extending direction of the strip groove is the same as an extending direction of the first type of hole.

4. The rolling force digital measuring instrument with eccentric load detection function according to claim 1, characterized in that: Each test unit in the force gauge is calibrated independently, and any uncalibrated force unit is selected from the plurality of force units as a designated force unit. The calibration process of the force unit includes the following steps: Step A, each test unit in the dynamometer is unloaded; Step B, the secondary instrument sends a record zero point instruction to the dynamometer; Step C, applying rated pressure to the designated force measuring unit; Step D, the secondary instrument sends an instruction to the dynamometer to designate a force measuring unit to record a rated point, and the calibration of the designated force measuring unit is completed; Step E: If all force measuring units are calibrated, the calibration process ends. If there are uncalibrated force measuring units, any one of the uncalibrated force measuring units is used as a designated force measuring unit, and steps C to D are executed.

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