A combined mass and torque measuring device and method

Abstract

This invention proposes a composite mass and torque measurement device and method, belonging to the field of metrology equipment technology. The device includes a main body, which comprises a bearing cover, a connecting column, a fixed connection assembly, a photoelectric module, a magnetic steel assembly, and multiple force transmission components. This invention integrates mass measurement and torque measurement into a single metrology device, enabling composite measurement of mass and torque under the same environmental conditions. This reduces measurement errors caused by simultaneous measurement of mass and torque, improves measurement accuracy and data consistency, and also increases measurement efficiency, thus well meeting the application requirements of automated production lines or rapid response measurement equipment.

Description

Technical Field

[0001] This invention belongs to the field of metrology equipment technology, and relates to mass and torque measurement technology, specifically a mass and torque composite measurement device and method. Background Technology

[0002] With the sustained prosperity and development of my country's economy, the country's metrology industry has also made rapid progress, and the metrology needs of various industries are becoming increasingly heavy, leading to a gradual increase in the volume of metrology services. Mechanical metrology is an important branch of metrology, encompassing mass metrology, volume metrology, force metrology, pressure metrology, vacuum metrology, flow metrology, density metrology, rotational speed metrology, torque metrology, vibration and shock metrology, and acceleration metrology. Among these, mass / torque metrology is involved in various industrial fields, including machinery manufacturing, automotive, aerospace, construction, and energy. Therefore, mass / torque metrology is not only of great significance to scientific research but also plays a vital role in areas such as trade settlement, healthcare, and environmental monitoring.

[0003] In traditional metrology, mass / torque measurement requires separate measurements using different measuring instruments. Mass measuring equipment is used to measure mass, while torque measuring equipment is used to measure torque. When measured separately, the data are not measured under the same environmental conditions because they are different instruments. This not only introduces measurement errors from the two types of measuring equipment, affecting measurement accuracy, but also results in low measurement efficiency, failing to meet the application requirements of automated production lines or rapid-response measuring equipment. Summary of the Invention

[0004] In view of the above-described background technology, traditional mass measurement and torque measurement are performed by two separate measuring devices. The discrepancy between the two measuring devices leads to errors, resulting in low measurement accuracy and low measurement efficiency. To address this technical problem, the present invention proposes a composite mass and torque measuring device and method.

[0005] This invention integrates mass measurement and torque measurement into a single metrology device, enabling composite measurement of mass and torque under the same environmental and conditions. This reduces measurement errors caused by metrology devices, improves measurement accuracy, and also increases measurement efficiency, thus well meeting the application needs of automated production lines or rapid response measurement devices.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] The present invention provides a composite mass and torque measuring device, comprising a device body, the device body including a bearing cover, a connecting column, a fixed connection assembly, a photoelectric module, and multiple force transmission components;

[0008] The support cover is used to support the object to be measured and to apply gravity and torque to the connecting column;

[0009] The fixed connection assembly is arranged side by side with the support cover and is used to fix the photoelectric module and multiple force transmission components.

[0010] The connecting post is connected to the support cover;

[0011] Multiple force-transmitting components are connected side-by-side between the bearing cover and the fixed connection assembly, and are distributed circumferentially along the connecting column. Each force-transmitting component has an angle with the plane of the bearing cover and with the plane of the fixed connection assembly, so that multiple force-transmitting components have a tendency to be twisted, for transmitting torque.

[0012] The photoelectric module is connected to the connecting column and is used to generate a photoelectric signal based on the photoelectric effect under the action of gravity and torsional force of the connecting column.

[0013] When the object under test acts on the bearing cover, the coupling model of mass and torque is determined based on the changing photoelectric signal and the distance between the center of the connecting column and the center of the bearing cover. The composite measurement of mass and torque is realized based on the coupling model of mass and torque.

[0014] The coupling model between mass and torque is as follows:

[0015]

[0016] T is torque, unit: N·m; K is the strain coefficient of the material used in the connecting column and force transmission components, dimensionless; ΔS T β is the difference between the photoelectric signals generated based on the changing photoelectric signals, in mV; β is the proportionality coefficient of the photoelectric signal and the included angle, in mV / rad; L is the distance between the point of application of the torque and the center of the connecting column, in m; m is the mass, in kg; g is the acceleration due to gravity, in N / kg; d is the distance between the center of the connecting column and the center of the bearing cover, in m.

[0017] Furthermore, each of the force transmission components includes multiple force transmission rods connected sequentially from top to bottom, with adjacent force transmission rods connected by force transmission springs, the thickness of which ranges from 0.08 mm to 0.12 mm.

[0018] Further specified, the top of the force transmission component is provided with an upper fixing protrusion, and the bearing cover is connected to the force transmission component through the upper fixing protrusion; the bottom of the force transmission component is provided with a lower fixing protrusion, and the fixed connection assembly is connected to the force transmission component through the lower fixing protrusion.

[0019] Furthermore, a preload adjustment component is provided at the connection between the fixed connection assembly and the force transmission component, and the preload adjustment component is used to adjust the preload between the force transmission component and the fixed connection assembly.

[0020] Further defined, the optoelectronic module includes an optical gap plate, an optoelectronic module mounting base, a transmission line, a terminal block, an optoelectronic signal transmitting module, and an optoelectronic signal receiving module. The optoelectronic module mounting base is fixedly connected to a fixed connection assembly. The terminal block, the optoelectronic signal transmitting module, and the optoelectronic signal receiving module are all connected to the optoelectronic module mounting base. A gap is provided between the optoelectronic signal transmitting module and the optoelectronic signal receiving module. One end of the optical gap plate is connected to a connecting post, and the other end is provided with an optical gap extending into the gap.

[0021] The photoelectric signal receiving module is electrically connected to the terminal block, and the transmission line is electrically connected to the terminal block.

[0022] Further specifying, the mass and torque composite measuring device also includes a magnet assembly, which is located below and connected to the fixed connection assembly; the magnet assembly is electrically connected to the transmission line of the photoelectric module;

[0023] The connecting post extends below the fixed connecting assembly and connects to the magnet assembly, which is used to balance the gravity and torque on the connecting post.

[0024] Under the action of gravity and torsional force, the connecting column causes the optical gap on the optical gap plate to deflect, which in turn changes the photoelectric signal received by the photoelectric signal receiving module, thus generating a changed photoelectric signal.

[0025] Further defined, the magnetic steel assembly includes a magnetic yoke, a permanent magnet, a magnetizing element, and a coil disposed within the permanent magnet. The magnetic yoke has a receiving cavity, and the permanent magnet and the magnetizing element are disposed sequentially from top to bottom within the receiving cavity. The coil on the permanent magnet is electrically connected to a transmission line. The connecting post is connected to the permanent magnet. The fixed connection assembly is fixedly connected to the magnetic yoke. Magnetic gaps are provided between the magnetic yoke and the permanent magnet, and between the magnetic yoke and the magnetizing element.

[0026] Further specifying, the fixed connection assembly includes an upper flange and a lower flange, the upper flange and the lower flange are fixedly connected, and both the upper flange and the lower flange are arranged side by side with the bearing cover; the photoelectric module and multiple force transmission components are all connected to the upper flange.

[0027] This invention discloses a method for combined mass and torque measurement, comprising the following steps:

[0028] S1: Install the aforementioned composite mass and torque measuring device;

[0029] S2: When the bearing cover is not carrying the object to be measured, the bearing cover is in a balanced state;

[0030] When the bearing cover supports the object to be measured, the object to be measured applies gravity and torque to the connecting column, causing the connecting column to deform axially. This causes the photoelectric module to generate a changing photoelectric signal based on the photoelectric effect under the action of gravity and torsional force of the connecting column.

[0031] S3: A coupled model for determining mass and torque is based on the changing photoelectric signal and the distance between the center of the connecting column and the center of the bearing cover. The coupled model for mass and torque enables composite measurement of mass and torque.

[0032] The coupling model between mass and torque is as follows:

[0033]

[0034] T is torque, unit: N·m; K is the strain coefficient of the material used in the connecting column and force transmission components, dimensionless; ΔS T β is the difference between the photoelectric signals generated based on the changing photoelectric signals, in mV; β is the proportionality coefficient of the photoelectric signal and the included angle, in mV / rad; L is the distance between the point of application of the torque and the center of the connecting column, in m; m is the mass, in kg; g is the acceleration due to gravity, in N / kg; d is the distance between the center of the connecting column and the center of the bearing cover, in m.

[0035] To further define the model for calculating quality, it is as follows:

[0036]

[0037] In the formula, m is the mass, unit: kg; g is the gravitational acceleration, unit: N / kg; K is the strain coefficient of the materials used in the connecting column and force transmission components, dimensionless; a is the proportionality coefficient between the photoelectric signal and the gravity of the object being measured, unit: mV / N; S g The total amplitude of the photoelectric signal, in Mv; ΔS T γ is the difference between the photoelectric signals generated based on the changing photoelectric signal, in mV; γ is the influence coefficient of torque on the total amplitude of the photoelectric signal, dimensionless.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0039] 1. This invention discloses a composite mass and torque measuring device. It utilizes a connecting column to bear gravity and torque, and a force transmission component to transmit the torque. Under the combined force of gravity and torque on the connecting column, a photoelectric module generates a changing photoelectric signal based on the photoelectric effect. Based on this changing photoelectric signal and the distance between the center of the connecting column and the center of the bearing cover, a coupling model for mass and torque is determined. This model enables composite mass and torque measurement. This invention integrates mass and torque measurement into a single measuring device, allowing for composite measurement of mass and torque under the same environmental conditions. It reduces measurement errors introduced by other measuring devices when simultaneously measuring mass and torque, improves measurement accuracy and data consistency, and increases measurement efficiency. This device effectively meets the application requirements of automated production lines or rapid-response measuring equipment.

[0040] 2. The present invention designs the force transmission component as multiple force transmission rods connected sequentially from top to bottom, and sets force transmission springs between two adjacent force transmission rods. At the same time, the thickness of the force transmission springs is limited to between 0.08 mm and 0.12 mm, which can improve the sensitivity of measurement while transmitting force.

[0041] 3. The present invention provides a preload adjustment component at the connection between the fixed connection component and the force transmission component. The preload adjustment component can adjust the preload between the force transmission component and the fixed connection component, so as to realize the independent adjustment of the preload between each force transmission component and the fixed connection component, which is convenient for calibration.

[0042] 4. This invention integrates mass measurement and torque measurement into one metrology device, which reduces the workload of calibrating the mass measurement device and the torque measurement device, and eliminates the need for users to purchase separate mass measurement device and torque measurement device, thus reducing costs. Attached Figure Description

[0043] Figure 1 This is an overall schematic diagram of the mass and torque composite measuring device of the present invention.

[0044] Figure 2 This is a schematic diagram of the structure of the composite mass and torque measuring device of the present invention;

[0045] Figure 3 This is a schematic diagram of the optoelectronic module.

[0046] Figure 4 This is a schematic diagram showing the installation of the optoelectronic module and the connecting post;

[0047] Figure 5 This is a schematic diagram of the structure of the support cover;

[0048] Figure 6 This is a structural schematic diagram of the force transmission component;

[0049] Figure 7 Schematic diagram of the connecting column structure Figure 1 ;

[0050] Figure 8 This is a schematic diagram of the upper flange structure;

[0051] Figure 9 This is a structural schematic diagram of the lower flange;

[0052] Figure 10 This is a schematic diagram showing the connection between the lower flange and the magnetic yoke;

[0053] Figure 11 A schematic diagram showing the connection between the permanent magnet and the yoke;

[0054] Figure 12 A schematic diagram showing the connection of the permanent magnet, the yoke, and the magnetizing element;

[0055] Figure 13 This is a schematic diagram showing the connection between the permanent magnet and the connecting post;

[0056] Figure 14 Schematic diagram of the connecting column structure Figure 2 ;

[0057] Figure 15 This is a schematic diagram of the temperature sensor installation.

[0058] Figure 16 This is a schematic diagram of the optical gap plate.

[0059] Figure 17 This is a structural diagram of the optoelectronic module mounting bracket;

[0060] In the diagram, 1-device body, 2-control module, 3-display module, 4-bearing cover, 5-force transmission component, 6-connecting column, 7-adjusting bolt, 8-upper flange, 9-lower flange, 10-optical gap plate, 11-photoelectric module mounting base, 12-transmission line, 13-terminal block, 14-force transmission spring, 15-adjusting bolt hole, 16-lower fixing protrusion, 17-upper fixing protrusion, 18-lower threaded hole of connecting column, 19-middle threaded hole of connecting column, 20-upper thread of connecting column Hole, 21- Upper flange threaded hole, 22- Upper flange fixing groove, 23- Lower flange countersunk hole, 24- Lower flange bolt hole, 25- Lower flange countersunk bolt, 26- Permanent magnet threaded hole, 27- Coil, 28- Magnetic yoke, 29- Coil bolt hole, 30- Permanent magnet, 31- Magnetizing, 32- Connecting column bolt, 33- Temperature sensor, 34- Optical gap, 35- Photoelectric signal transmitting module, 36- Photoelectric signal receiving module, 37- Shoulder, 38- Magnetic gap. Detailed Implementation

[0061] The technical solution of the present invention will be further explained and described below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the embodiments described below.

[0062] See Figure 2 The present invention provides a composite mass and torque measuring device, comprising a device body 1, the device body 1 comprising a bearing cover 4, a connecting column 6, a fixed connection assembly, a photoelectric module, a magnetic steel assembly, and multiple force transmission components 5;

[0063] The support cover 4 is used to support the object to be measured and to apply gravity and torque to the connecting column 6;

[0064] A fixed connection assembly is arranged side by side with the support cover 4 and is used to fix the photoelectric module, the magnetic steel assembly and multiple force transmission components 5.

[0065] The connecting column 6 is connected at one end to the bearing cover 4, and at the other end passes through the fixed connection assembly and connects to the magnet assembly located below the fixed connection assembly. It is used to transfer gravity to the magnet assembly, which in turn balances the gravity and torque on the connecting column 6. Specifically, during operation, when a torque load or mass load is applied to the bearing cover 4, the connecting column 6 will experience a vertically downward load F. f Under the aforementioned load, connecting column 6 will undergo a vertically downward displacement, at which point the magnet assembly will generate a vertically upward electromagnetic force F. m This makes F m =F f This ensures that the connecting column 6 is in a dynamic equilibrium state, preventing damage to the connecting column 6 due to overload.

[0066] Multiple force transmission components 5 are connected side by side between the bearing cover 4 and the fixed connection assembly, and are distributed along the circumference of the connecting column 6. Each force transmission component 5 has an angle with the plane where the bearing cover 4 is located and with the plane where the fixed connection assembly is located, which makes the multiple force transmission components 5 have a tendency to be twisted.

[0067] The photoelectric module, connected to the connecting column 6, is used to generate a changing photoelectric signal based on the photoelectric effect under the action of gravity and torsional force of the connecting column 6. When the object under test acts on the bearing cover 4, the coupling model of mass and torque is determined based on the changing photoelectric signal and the distance between the center of the connecting column 6 and the center of the bearing cover 4. The composite measurement of mass and torque is realized based on the coupling model of mass and torque.

[0068] The coupling model between mass and torque is as follows:

[0069]

[0070] T is torque, unit: N·m; K is the strain coefficient of the materials used in connecting column 6 and force transmission component 5 (the materials used in connecting column 6 and force transmission component 5 are the same), dimensionless; ΔS T β is the difference between the photoelectric signals generated based on the changing photoelectric signals, in mV; β is the proportionality coefficient of the photoelectric signal and the included angle, in mV / rad; L is the distance between the point of application of the torque and the center of the connecting column 6, in m; m is the mass, in kg; g is the acceleration due to gravity, in N / kg; d is the distance between the center of the connecting column 6 and the center of the bearing cover 4, in m.

[0071] The magnet assembly is electrically connected to the optoelectronic module.

[0072] In a preferred embodiment of the present invention, the connecting post 6 is connected to the center of the bearing cover 4, and the connecting post 6 passes through the fixed connection assembly along the center of the fixed connection assembly and is connected to the magnet assembly. The magnet assembly and the connecting post 6 are coaxially arranged.

[0073] Specifically, the number of force transmission components 5 can be 3, 4, 5, or even more; the present invention does not impose a specific limit on the number of force transmission components 5. In a preferred embodiment of the present invention, the number of force transmission components 5 is 5.

[0074] This invention integrates mass measurement and torque measurement into a single metrology device, enabling combined measurement of mass and torque under the same environmental conditions. This reduces measurement errors caused by the metrology device when simultaneously measuring mass and torque, improves measurement accuracy and data consistency, and also increases measurement efficiency. It can well meet the application needs of automated production lines or rapid response measurement devices.

[0075] See Figure 6 Each force transmission component 5 includes multiple force transmission rods connected sequentially from top to bottom. Adjacent force transmission rods are connected by force transmission springs 14, and the thickness of the force transmission springs 14 ranges from 0.08 mm to 0.12 mm.

[0076] Each force transmission component 5 may include 2, 3, 4, or even more force transmission rods. In a preferred embodiment of the invention, each force transmission component 5 includes 3 force transmission rods: a first force transmission rod, a second force transmission rod, and a third force transmission rod. The top end of the first force transmission rod is connected to the bearing cover 4, the bottom end of the first force transmission rod is connected to the top end of the second force transmission rod via a force transmission spring 14, the bottom end of the second force transmission rod is connected to the top end of the third force transmission rod via the force transmission spring 14, and the bottom end of the third force transmission rod is connected to a fixed connection assembly.

[0077] The thickness of the force transmission spring 14 can be 0.08 mm, 0.09 mm, 0.10 mm, 0.11 mm or 0.12 mm. As a preferred embodiment of the present invention, the thickness of the force transmission spring 14 is less than or equal to 0.10 mm, that is, the preferred value of the thickness of the force transmission spring 14 is 0.08 mm, 0.09 mm or 0.10 mm.

[0078] In this invention, the force transmission component 5 is designed as multiple force transmission rods connected sequentially from top to bottom. A force transmission spring 14 is set between two adjacent force transmission rods. At the same time, the thickness of the force transmission spring 14 is limited to between 0.08 mm and 0.12 mm, so that the force transmission spring 14 can improve the measurement sensitivity while transmitting force.

[0079] The fixed connection assembly includes an upper flange 8 and a lower flange 9, which are fixedly connected. Both the upper flange 8 and the lower flange 9 are arranged side by side with the bearing cover 4. The magnet assembly is located below the lower flange 9 and is fixedly connected to it. The photoelectric module and multiple force transmission components 5 are all connected to the upper flange 8. For details, see [link to details]. Figure 8 and Figure 9 The upper flange 8 is provided with an upper flange threaded hole 21, and the lower flange 9 is provided with a lower flange bolt hole 24. Flange bolts pass through the upper flange threaded hole 21 and the lower flange bolt hole 24, and the upper flange 8 and the lower flange 9 are fixedly connected by the flange bolts.

[0080] See Figure 3 , Figure 6 and Figure 8 The force transmission component 5 has an upper fixing protrusion 17 on its top, and the bearing cover 4 is connected to the force transmission component 5 through the upper fixing protrusion 17. The force transmission component 5 has a lower fixing protrusion 16 on its bottom, and the fixed connection assembly is connected to the force transmission component 5 through the lower fixing protrusion 16. Specifically, a slot matching the shape of the upper fixing protrusion 17 is provided on the bottom end face of the bearing cover 4, and the upper fixing protrusion 17 extends into the slot and engages with the slot, so that the bearing cover 4 is connected to the force transmission component 5. An upper flange fixing groove 22 matching the shape of the lower fixing protrusion 16 is provided on the top end face of the upper flange 8, and the lower fixing protrusion 16 extends into the upper flange fixing groove 22 and engages with the upper flange fixing groove 22, so that the upper flange 8 is connected to the force transmission component 5.

[0081] See Figure 2A preload adjustment component is provided at the connection between the fixed connection assembly and the force transmission component 5. The preload adjustment component is used to adjust the preload between the force transmission component 5 and the fixed connection assembly. Specifically, the preload adjustment component is a threaded connection. In a preferred embodiment of the present invention, the preload adjustment component is an adjusting bolt 7. An adjusting bolt hole 15 is provided at the bottom of the force transmission component 5. The adjusting bolt 7 passes through the adjusting bolt hole 15 and connects to the upper flange 8 to preload the force transmission component 5 and the upper flange 8.

[0082] See Figure 5 , Figure 7 and Figure 14 A threaded hole 20 is provided on the top end face of the connecting column 6, and a countersunk hole is provided at the center line position of the bearing cover 4. The bolt 32 on the connecting column passes through the countersunk hole and extends into the threaded hole 20 on the connecting column to fix the bearing cover 4 and the connecting column 6.

[0083] See Figure 4 , Figure 13 , Figure 16 and Figure 17 In this invention, the photoelectric module includes a light gap plate 10, a photoelectric module mounting base 11, a transmission line 12, a terminal block 13, a photoelectric signal transmitting module 35, and a photoelectric signal receiving module 36. The photoelectric module mounting base 11 is fixedly connected to a fixed connection assembly. The terminal block 13, the photoelectric signal transmitting module 35, and the photoelectric signal receiving module 36 are all connected to the photoelectric module mounting base 11. A gap is provided between the photoelectric signal transmitting module 35 and the photoelectric signal receiving module 36. One end of the light gap plate 10 is connected to a connecting post 6, and the other end is provided with a light gap 34 extending into the gap. The photoelectric signal receiving module 36 is electrically connected to the terminal block 13. One end of the transmission line 12 is electrically connected to the terminal block 13, and the other end is electrically connected to the magnet assembly. Under the action of gravity and torsional force, the connecting post 6 causes the light gap 34 on the light gap plate 10 to deflect, causing the light signal received by the photoelectric signal receiving module 36 to change, generating a changing electric potential energy, and transmitting the changing electric potential energy to the magnet assembly through the terminal block 13 and the transmission line 12 in sequence. Specifically, the optoelectronic module mounting base 11 is fixedly connected to the upper end face of the upper flange 8.

[0084] See Figure 12 In this invention, the magnetic steel assembly includes a magnetic yoke 28, a permanent magnet 30, a magnetizing element 31, and a coil 27 disposed in the permanent magnet 30. The magnetic yoke 28 is provided with a receiving cavity, and the permanent magnet 30 and the magnetizing element 31 are disposed in the receiving cavity from top to bottom. The coil 27 on the permanent magnet 30 is electrically connected to the transmission line 12. The connecting post 6 is connected to the permanent magnet 30. The fixed connection assembly is fixedly connected to the magnetic yoke 28. Magnetic gaps 38 are provided between the magnetic yoke 28 and the permanent magnet 30, and between the magnetic yoke 28 and the magnetizing element 31.

[0085] See Figure 10 A countersunk hole 23 is provided on the lower flange 9, and the countersunk bolt 25 passes through the countersunk hole 23 and connects with the magnetic yoke 28, thereby realizing the fixed connection between the lower flange 9 and the magnetic yoke 28.

[0086] See Figure 7 and Figure 9 A connecting post lower threaded hole 18 is provided on the lower end face of the connecting post 6, and a permanent magnet threaded hole 26 is provided on the permanent magnet 30. The connecting post 6 and the permanent magnet 30 are fixedly connected by a screw extending into the connecting post lower threaded hole 18 and the permanent magnet threaded hole 26.

[0087] See Figure 7 A threaded hole 19 is provided in the middle of the connecting post 6. The connecting post 6 is fixedly connected to the light gap plate 10 by a screw that passes through the light gap plate 10 and extends into the threaded hole 19 in the middle of the connecting post.

[0088] See Figure 7 In a preferred embodiment of the present invention, the present invention provides a shoulder 37 on both the upper end face and the lower end face of the connecting column 6, which facilitates the installation of the connecting column 6 with the bearing cover 4 and the magnetic yoke 28.

[0089] See Figure 11 A coil bolt hole 29 is provided on the magnetic yoke 28, through which the coil 27 is led out and electrically connected to the transmission line 12.

[0090] As a preferred embodiment of the present invention, see Figure 1 This invention discloses a composite mass and torque measuring device, which further includes a control module 2 and a display module 3. The control module 2 is electrically connected to the coil 27 in the permanent magnet 30, and the control module 2 is communicatively connected to the display module 3. The communication connection can be wired or wireless, preferably wired. The control module 2 determines the mass and torque based on a coupled mass and torque model and a mass calculation model, and transmits the calculated mass and torque to the display module 3 for display.

[0091] Preferred, see Figure 15 The device body 1 of the present invention also includes a temperature sensor 33 installed on the bottom end face of the magnetic yoke 28. The temperature sensor 33 is communicatively connected to the display module 3. The communication connection can be wired or wireless. Preferably, the communication connection is wired. The temperature sensor 33 transmits the measured temperature data to the display module 3, and the display module 3 displays the temperature data.

[0092] The present invention also provides a method for combined mass and torque measurement, applied to the above-mentioned combined mass and torque measurement device, comprising the following steps:

[0093] S1: Install the aforementioned composite mass and torque measuring device;

[0094] S2: When the bearing cover 4 is not carrying the object to be measured, the bearing cover 4 is in a balanced state;

[0095] When the bearing cover 4 supports the object to be measured, the object to be measured is the connecting column 6, which is subjected to gravity and torque. The connecting column 6 undergoes axial deformation, causing the photoelectric module to generate a changing photoelectric signal based on the photoelectric effect under the action of gravity and torsional force of the connecting column 6.

[0096] S3: Based on the changing photoelectric signal and the distance between the center of the connecting column 6 and the center of the bearing cover 4, a coupled model of mass and torque is determined, and a composite measurement of mass and torque is realized based on the coupled model of mass and torque.

[0097] The coupling model between mass and torque is as follows:

[0098]

[0099] T is torque, unit: N·m; K is the strain coefficient of the materials used in connecting column 6 and force transmission component 5 (the materials used in connecting column 6 and force transmission component 5 are the same), dimensionless; ΔS T β is the difference between the photoelectric signals generated based on the changing photoelectric signals, in mV; β is the proportionality coefficient of the photoelectric signal and the included angle, in mV / rad; L is the distance between the point of application of the torque and the center of the connecting column 6, in m; m is the mass, in kg; g is the acceleration due to gravity, in N / kg; d is the distance between the center of the connecting column 6 and the center of the bearing cover 4, in m.

[0100] The calculation model for quality is as follows:

[0101]

[0102] In the formula, m is the mass, unit: kg; g is the gravitational acceleration, unit: N / kg; K is the strain coefficient of the materials used in connecting column 6 and force transmission component 5 (the materials used in connecting column 6 and force transmission component 5 are the same), dimensionless; a is the proportionality coefficient between the photoelectric signal and the gravity of the object under test, unit: mV / N; S g The total amplitude of the photoelectric signal, in Mv; ΔS T γ is the difference between the photoelectric signals generated based on the changing photoelectric signal, in mV; γ is the influence coefficient of torque on the total amplitude of the photoelectric signal, dimensionless.

[0103] In the above formula, a, β, γ, and K are all determined experimentally, and the determination process is as follows:

[0104] In the composite mass and torque measurement of this invention, a series of known masses m are applied. i The weights (note: during this process, the combined mass and torque measurement needs to be placed horizontally, and the center of mass of the weights should be aligned with the center of convergence of the combined mass and torque measurement to avoid the influence of additional torque) are used to record the photoelectric signal amplitude S corresponding to different weights. g S g =(S left +S right ) / 2, S left and S right These represent the left and right differences in the photoelectric signals under gravity and torque, respectively; the difference is based on the photoelectric signal amplitude S after each loading of weights. g Calculate the corresponding gravity F g Gravity F g The calculation formula is:

[0105]

[0106] F g With S g By fitting the experimental data, the values ​​of K and a are obtained.

[0107] Experiments show that the typical range of a is (10 3 ~10 5 )mV / N, where a is taken as 10 in this application. 3 mV / N.

[0108] β represents the proportionality coefficient between the photoelectric signal and the included angle. The combined mass and torque measurement is placed on an adjustable tilting platform. The platform tilt angle θ is adjusted (note: during this process, it is necessary to avoid loading additional mass and ensure that the center of the tilting platform is aligned with the center of the combined mass and torque measurement). The photoelectric signal difference ΔS generated by the changing photoelectric signal at each angle is recorded. T =S left -S right Establish ΔS T The linear relationship with the platform tilt angle θ:

[0109] ΔS T =β·θ

[0110] In the formula, ΔS T θ represents the difference between the photoelectric signals generated based on the changing photoelectric signals, in mV; θ is the platform tilt angle, in rad.

[0111] ΔS T By fitting the coefficient to θ, the scaling factor is obtained. Experiments show that the typical range of β is (10~10). 3)mV / rad, and in this application, the preferred value of β is 500mV / rad.

[0112] It should be noted that the mass and torque composite measurement method of the present invention corresponds completely to the mass and torque composite measurement device described above. For the structure and principle of the mass and torque composite measurement method that are not described in detail, please refer to the description of the mass and torque composite measurement device section above.

[0113] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A combined mass and torque measuring device, characterized in that, The device includes a main body (1), which includes a support cover (4), a connecting column (6), a fixed connection assembly, a photoelectric module, and multiple force transmission components (5). The support cover (4) is used to support the object to be measured and to apply gravity and torque to the connecting column (6); The fixed connection assembly is arranged side by side with the support cover (4) and is used to fix the photoelectric module and multiple force transmission components (5); The connecting column (6) is connected to the bearing cover (4); Multiple force transmission components (5) are connected side by side between the bearing cover (4) and the fixed connection assembly, and are distributed along the circumference of the connecting column (6). Each force transmission component (5) has an angle with the plane of the bearing cover (4) and with the plane of the fixed connection assembly, so that multiple force transmission components (5) have a tendency to be twisted, for transmitting torque. The photoelectric module is connected to the connecting post (6) and is used to generate a photoelectric signal based on the photoelectric effect under the action of gravity and torsional force of the connecting post (6); When the object to be measured acts on the bearing cover (4), the coupling model of mass and torque is determined based on the changing photoelectric signal and the distance between the center of the connecting column (6) and the center of the bearing cover (4), and the composite measurement of mass and torque is realized based on the coupling model of mass and torque. The coupling model between mass and torque is as follows: T is torque, unit: N·m; K is the strain coefficient of the materials used in the connecting column (6) and the force transmission component (5), dimensionless; ΔS T β is the difference between the photoelectric signals generated based on the changing photoelectric signals, in mV; β is the proportionality coefficient between the photoelectric signal and the included angle, in mV / rad; L is the distance between the point of application of the torque and the center of the connecting column (6), in m; m is the mass, in kg; g is the gravitational acceleration, in N / kg; d is the distance between the center of the connecting column (6) and the center of the bearing cover (4), in m.

2. The mass and torque combined measuring device according to claim 1, characterized in that, Each of the force transmission components (5) includes multiple force transmission rods connected sequentially from top to bottom. Adjacent force transmission rods are connected by force transmission springs (14), and the thickness of the force transmission springs (14) ranges from 0.08 mm to 0.12 mm.

3. The mass and torque combined measuring device according to claim 1, characterized in that, The top of the force transmission component (5) is provided with an upper fixing protrusion (17), and the bearing cover (4) is connected to the force transmission component (5) through the upper fixing protrusion (17); the bottom of the force transmission component (5) is provided with a lower fixing protrusion (16), and the fixed connection assembly is connected to the force transmission component (5) through the lower fixing protrusion (16).

4. The mass and torque composite measuring device according to claim 3, characterized in that, A preload adjustment component is provided at the connection between the fixed connection assembly and the force transmission component (5). The preload adjustment component is used to adjust the preload between the force transmission component (5) and the fixed connection assembly.

5. The mass and torque combined measuring device according to claim 1, characterized in that, The optoelectronic module includes an optical gap plate (10), an optoelectronic module mounting base (11), a transmission line (12), a terminal block (13), an optoelectronic signal transmitting module (35), and an optoelectronic signal receiving module (36). The optoelectronic module mounting base (11) is fixedly connected to a fixed connection assembly. The terminal block (13), the optoelectronic signal transmitting module (35), and the optoelectronic signal receiving module (36) are all connected to the optoelectronic module mounting base (11). A gap is provided between the optoelectronic signal transmitting module (35) and the optoelectronic signal receiving module (36). One end of the optical gap plate (10) is connected to a connecting post (6), and the other end is provided with an optical gap (34) extending into the gap. The photoelectric signal receiving module (36) is electrically connected to the terminal block (13), and the transmission line (12) is electrically connected to the terminal block (13).

6. The mass and torque combined measuring device according to claim 5, characterized in that, The mass and torque composite measuring device also includes a magnet assembly, which is located below and connected to the fixed connection assembly; the magnet assembly is electrically connected to the transmission line (12) of the photoelectric module. The connecting post (6) extends below the fixed connecting assembly and is connected to the magnet assembly, which is used to balance the gravity and torque on the connecting post (6); Under the action of gravity and torsional force, the connecting column (6) causes the optical gap (34) on the optical gap plate (10) to deflect, which causes the photoelectric signal received by the photoelectric signal receiving module (36) to change and generate a changed photoelectric signal.

7. The mass and torque composite measuring device according to claim 6, characterized in that, The magnet assembly includes a yoke (28), a permanent magnet (30), a magnetizing element (31), and a coil (27) disposed in the permanent magnet (30). The yoke (28) has a receiving cavity. The permanent magnet (30) and the magnetizing element (31) are disposed in the receiving cavity from top to bottom. The coil (27) on the permanent magnet (30) is electrically connected to the transmission line (12). The connecting post (6) is connected to the permanent magnet (30). The fixed connection assembly is fixedly connected to the yoke (28). Magnetic gaps (38) are provided between the yoke (28) and the permanent magnet (30) and between the yoke (28) and the magnetizing element (31).

8. The mass and torque composite measuring device according to claim 1, characterized in that, The fixed connection assembly includes an upper flange (8) and a lower flange (9), the upper flange (8) and the lower flange (9) are fixedly connected, and both the upper flange (8) and the lower flange (9) are arranged side by side with the bearing cover (4); the photoelectric module and multiple force transmission components (5) are all connected to the upper flange (8).

9. A method for combined mass and torque measurement, characterized in that, Includes the following steps: S1: Install the mass and torque composite measuring device as described in claim 1; S2: When the bearing cover (4) is not carrying the object to be measured, the bearing cover (4) is in a balanced state; When the bearing cover (4) carries the object to be measured, the object to be measured is the connecting column (6) which is subjected to gravity and torque. The connecting column (6) undergoes axial deformation, so that the photoelectric module generates a changing photoelectric signal based on the photoelectric effect under the action of gravity and torsional force of the connecting column (6). S3: Based on the changing photoelectric signal and the distance between the center of the connecting column (6) and the center of the bearing cover (4), a coupling model of mass and torque is determined, and a composite measurement of mass and torque is realized based on the coupling model of mass and torque; The coupling model between mass and torque is as follows: T is torque, unit: N·m; K is the strain coefficient of the material used in the connecting column (6) and the force transmission component (5), dimensionless; dimensionless; ΔS T β is the difference between the photoelectric signals generated based on the changing photoelectric signals, in mV; β is the proportionality coefficient between the photoelectric signal and the included angle, in mV / rad; L is the distance between the point of application of the torque and the center of the connecting column (6), in m; m is the mass, in kg; g is the gravitational acceleration, in N / kg; d is the distance between the center of the connecting column (6) and the center of the bearing cover (4), in m.

10. The composite mass and torque measurement method according to claim 9, characterized in that, The calculation model for quality is as follows: In the formula, m is the mass, unit: kg; g is the gravitational acceleration, unit: N / kg; K is the strain coefficient of the material used in the connecting column (6) and the force transmission component (5), which is dimensionless; 'a' is the proportionality coefficient between the photoelectric signal and the gravity of the object being measured, in mV / N; S g The total amplitude of the photoelectric signal, in Mv; ΔS T The difference between photoelectric signals generated based on the changing photoelectric signal, in mV; γ is the influence coefficient of torque on the total amplitude of the photoelectric signal, which is dimensionless.

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