Sensor for measuring stirring torque and use method thereof

Abstract

The invention discloses a sensor for measuring stirring torque and a using method thereof.The sensor comprises a sensor body, the sensor body comprises an installation fixing base, a middle shaft body rear section, a middle shaft body front section, a sealing shell and a stress plate, one end of the installation fixing base is connected with one end of the middle shaft body rear section, and the other end of the middle shaft body rear section is connected with one end of the sealing shell; the other end of the sealing shell is connected with one end of the middle shaft body front section, the other end of the middle shaft body front section is in threaded connection with two symmetrically-arranged stress plate connecting bolts, and the middle shaft body front section is connected with one side of a stress plate through the stress plate connecting bolts. According to the sensor, the small deformation of the elastic connecting body in the sensor is measured through the full-bridge strain gauge assembly, so that high-precision output voltage is obtained, the output voltage is amplified and converted to obtain a high-precision stirring torque value, and the stirring torque value is accurately measured through the full-bridge strain gauge assembly. The stirring device is applied to various types of stirring devices.

Description

Technical Field

[0001] The invention relates to the technical field of torque acquisition and conversion, and in particular to a sensor for measuring stirring torque and a use method thereof. Background Art

[0002] In industrial production, there are relatively many solid-liquid stirring and mixing devices or equipment. During the stirring process, the stirring torque has always been a relatively important production parameter. The torque value can reflect certain properties of the stirred mixed material. An automated control closed loop can be formed through the torque value. The existing technology uses non-contact indirect methods to measure the stirring torque, such as measuring the stirring motor driving current, measuring the hydraulic device driving pressure, etc.

[0003] However, traditional torque measurement has the following disadvantages;

[0004] Traditional indirect measurement methods are easily affected by external environmental interference, have low measurement accuracy, and are difficult to form an effective control closed loop. Summary of the invention

[0005] The purpose of the present invention is to provide a sensor for measuring stirring torque and a method of using the same, so as to solve the problem that the traditional indirect measurement method proposed in the above background technology is easily disturbed by the external environment, has low measurement accuracy, and is difficult to form an effective control closed loop.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A sensor for measuring stirring torque comprises a sensor, wherein the sensor comprises a mounting base, a rear section of a central axis body, a front section of a central axis body, a sealed shell and a force plate, wherein one end of the mounting base is connected to one end of the rear section of the central axis body, the other end of the rear section of the central axis body is connected to one end of the sealed shell, the other end of the sealed shell is connected to one end of the front section of the central axis body, the other end of the front section of the central axis body is threadedly connected to two symmetrically arranged force plate connecting bolts, the front section of the central axis body is connected to one side of the force plate through the force plate connecting bolts, the inner wall of the sealed shell is connected to the outer circumference of the rear section of the central axis body, an elastic connector is arranged in the sealed shell, a strain gauge circuit is installed in the sealed shell and is located on one side and outside the elastic connector, a strain gauge assembly is arranged in the strain gauge circuit, one end of the elastic connector is connected to one side of the rear section of the central axis body, the other end of the elastic connector is connected to one side of the front section of the central axis body, and the bottom ends of the two force plate connecting bolts are threadedly connected to force plate connecting nuts.

[0008] As a preferred technical solution of the present invention, the strain gauge assembly includes a first strain gauge, a second strain gauge, a third strain gauge and a fourth strain gauge, one side of the first strain gauge is connected to one side of the top of the elastic connector, one side of the second strain gauge is connected to one side of the bottom of the elastic connector, one side of the third strain gauge is connected to the other side of the top of the elastic connector, and one side of the fourth strain gauge is connected to the other side of the bottom of the elastic connector.

[0009] As a preferred technical solution of the present invention, the interior of the sealed housing is filled with flexible gel, the top of the elastic connector is connected to a transmitter PCB board via the flexible gel, and one end of the transmitter PCB board is connected to an input and output cable extending to the outside.

[0010] As a preferred technical solution of the present invention, both ends of the mounting base away from the rear section of the central axis body are installed with symmetrically arranged auxiliary fixing bolts, and the middle part of the mounting base away from the rear section of the central axis body is installed with a main fixing bolt.

[0011] As a preferred technical solution of the present invention, symmetrically arranged chamfers are provided on both sides of the connection between the mounting fixing seat and the rear section of the central axis body.

[0012] As a preferred technical solution of the present invention, the sealing shell is connected to the outer circumference of the front section of the central axis body, a rear end connecting seam is provided on the outer side of the connection between the sealing shell and the rear section of the central axis body, and a front end connecting seam is provided on the outer side of the connection between the sealing shell and the front section of the central axis body. There is a special sealing shell design, and the prior art does not have a completely sealed design, which mainly protects this sealing structure.

[0013] As a preferred technical solution of the present invention, a circuit center hole is opened in the middle of the rear section of the central axis body, and an elastic connector center line hole is opened in the middle of the elastic connector.

[0014] As a preferred technical solution of the present invention, the strain gauge circuit includes a first strain gauge static resistor R, a second strain gauge static resistor R, a third strain gauge static resistor R, a fourth strain gauge static resistor R, a left arm temperature compensation resistor R5 and a right arm temperature compensation resistor R6. The first strain gauge static resistor R1, the second strain gauge static resistor R2, the third strain gauge static resistor R3 and the fourth strain gauge static resistor R4 are connected in series, the connection between the first strain gauge static resistor R1 and the fourth strain gauge static resistor R4 is connected to one end of the left arm temperature compensation resistor R5, the connection between the second strain gauge static resistor R2 and the third strain gauge static resistor R3 is connected to one end of the right arm temperature compensation resistor R6, an input voltage Ui is connected between the right arm temperature compensation resistor R6 and the left arm temperature compensation resistor R5, and an output voltage Uo is connected between the connection between the first strain gauge static resistor R1 and the second strain gauge static resistor R2 and the connection between the third strain gauge static resistor R3 and the fourth strain gauge static resistor R4.

[0015] As a preferred technical solution of the present invention, the elastic connector is a cuboid.

[0016] The present invention provides a method for using a sensor for measuring stirring torque, comprising the following steps:

[0017] Step 1: Install and fix the sensor: Select a location on the outer wall of the stirring device to drill a hole. Before drilling, accurately measure the size of the sensor. Then evenly apply a layer of sealant on the bottom of the sensor's mounting base. Extend the sensor's fixing bolts from the inside to the outside through the holes on the outer wall. The sensor is inside the stirring device. Use suitable nuts to connect the main fixing bolts and the auxiliary fixing bolts and tighten them.

[0018] Step 2: Sensor connection: Connect the sensor's input and output cables to a dedicated electronic converter with amplification and digital-to-analog conversion functions according to technical requirements;

[0019] Step 3: Test and Detection: Power on to test whether the circuit connection is normal. If the test is normal, proceed to step 4;

[0020] Step 4: Numerical detection: Add a small amount of stirring material to test whether the output stirring torque value changes normally.

[0021] Compared with the prior art, the beneficial effects of the present invention are: the sensor measures the tiny deformation of the elastic connector inside the sensor through a full-bridge strain gauge assembly, thereby obtaining a high-precision output voltage, and obtains a high-precision stirring torque value by amplifying and converting the output voltage, which is applied to various types of stirring devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A perspective view of the present invention;

[0023] Figure 2 is a side view of the present invention;

[0024] Figure 3 is a cross-sectional view of the present invention;

[0025] Figure 4 It is a partial schematic diagram of the present invention;

[0026] Figure 5 is a circuit diagram of a strain gauge circuit of the present invention;

[0027] Figure 6 It is a flow chart of the present invention.

[0028] In the figure: 1. Mounting base; 101. Auxiliary fixing bolt; 102. Main fixing bolt; 103. Chamfer; 104. Rear end connection seam; 105. Front end connection seam; 106. Load plate connection bolt; 107. Load plate connection nut; 108. Line center hole; 109. Elastic connector center line hole; 2. Rear section of central axis; 3. Elastic connector; 4. Strain gauge assembly; 41. First strain gauge; 42. Second strain gauge; 43. Third strain gauge; 44. Fourth strain gauge; 45. Strain gauge Circuit; 451, first strain gauge static resistor R1; 452, second strain gauge static resistor R2; 453, third strain gauge static resistor R3; 454, fourth strain gauge static resistor R4; 455, left arm temperature compensation resistor R5; 456, right arm temperature compensation resistor R6; 457, input voltage Ui; 458, output voltage Uo; 5, transmitter PCB board; 6, input and output cables; 7, front section of the central axis; 8, sealed housing; 9, force plate; 10, sensor; 11, flexible gel. DETAILED DESCRIPTION

[0029] The following will be combined with 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.

[0030] See also Figure 1-6The present invention provides a sensor for measuring stirring torque, including a sensor 10, the sensor 10 includes a mounting base 1, a rear section 2 of a central axis body, a front section 7 of a central axis body, a sealing shell 8 and a force plate 9, one end of the mounting base 1 is connected to one end of the rear section 2 of the central axis body, the other end of the rear section 2 of the central axis body is connected to one end of the sealing shell 8, the other end of the sealing shell 8 is connected to one end of the front section 7 of the central axis body, the other end of the front section 7 of the central axis body is threadedly connected to two symmetrically arranged force plate connecting bolts 106, the front section 7 of the central axis body is connected to the force plate through The connecting bolt 106 is connected to one side of the force-bearing plate 9, the inner wall of the sealing shell 8 is connected to the outer circumference of the rear section 2 of the central axis body, an elastic connector 3 is provided in the sealing shell 8, a strain gauge circuit 45 is installed in the sealing shell 8 and is located on one side and outside the elastic connector 3, a strain gauge assembly 4 is provided in the strain gauge circuit 45, one end of the elastic connector 3 is connected to one side of the rear section 2 of the central axis body, and the other end of the elastic connector 3 is connected to one side of the front section 7 of the central axis body, and the bottom ends of the two force-bearing plate connecting bolts 106 are threadedly connected with force-bearing plate connecting nuts 107.

[0031] The strain gauge assembly 4 includes a first strain gauge 41, a second strain gauge 42, a third strain gauge 43 and a fourth strain gauge 44. One side of the first strain gauge 41 is connected to one side of the top of the elastic connector 3, one side of the second strain gauge 42 is connected to one side of the bottom of the elastic connector 3, one side of the third strain gauge 43 is connected to the other side of the top of the elastic connector 3, and one side of the fourth strain gauge 44 is connected to the other side of the bottom of the elastic connector 3.

[0032] The interior of the sealed housing 8 is filled with a flexible gel 11 , the top of the elastic connector 3 is connected to the transmitter PCB 5 via the flexible gel 11 , and one end of the transmitter PCB 5 is connected to an input / output cable 6 extending to the outside.

[0033] Auxiliary fixing bolts 101 are symmetrically installed at both ends of the installation fixing seat 1 away from the rear section 2 of the central axis body, and a main fixing bolt 102 is installed in the middle of the installation fixing seat 1 away from the rear section 2 of the central axis body.

[0034] Symmetrically arranged chamfers 103 are provided on both sides of the connection between the mounting base 1 and the rear section 2 of the central axis.

[0035] The sealing shell 8 is connected to the outer circumference of the central shaft body front section 7 , a rear end connection seam 104 is provided on the outer side of the connection between the sealing shell 8 and the central shaft body rear section 2 , and a front end connection seam 105 is provided on the outer side of the connection between the sealing shell 8 and the central shaft body front section 7 .

[0036] A circuit center hole 108 is opened in the middle of the rear section 2 of the central axis body, and an elastic connector center line hole 109 is opened in the middle of the elastic connector 3.

[0037] The strain gauge circuit 45 includes a first strain gauge static resistor R1451, a second strain gauge static resistor R2452, a third strain gauge static resistor R3453, a fourth strain gauge static resistor R4454, a left arm temperature compensation resistor R5455, and a right arm temperature compensation resistor R6456. The first strain gauge static resistor R1451, the second strain gauge static resistor R2452, the third strain gauge static resistor R3453, and the fourth strain gauge static resistor R4454 are connected in series, and the connection between the first strain gauge static resistor R1451 and the fourth strain gauge static resistor R4454 is connected to the left arm temperature compensation resistor R5455. One end of the arm temperature compensation resistor R5455 is connected, the connection between the second strain gauge static resistor R2452 and the third strain gauge static resistor R3453 is connected to one end of the right arm temperature compensation resistor R6456, an input voltage Ui457 is connected between the right arm temperature compensation resistor R6456 and the left arm temperature compensation resistor R5455, and an output voltage Uo458 is connected between the connection between the first strain gauge static resistor R1451 and the second strain gauge static resistor R2452 and the connection between the third strain gauge static resistor R3453 and the fourth strain gauge static resistor R4454.

[0038] The elastic connecting body 3 is a rectangular parallelepiped.

[0039] The present invention provides a method for using a sensor for measuring stirring torque, comprising the following steps:

[0040] Step 1, install and fix the sensor 10: select a position on the circumferential outer wall of the stirring device to drill a hole. Before drilling, accurately measure the size of the sensor 10, and then evenly apply a layer of sealant on the bottom of the installation base 1 of the sensor 10. Extend the fixing bolts of the sensor 10 from the inside to the outside through the holes on the circumferential outer wall. The sensor 10 is inside the stirring device. Use suitable nuts to connect the main fixing bolts 102 and the auxiliary fixing bolts 101, and tighten them;

[0041] Step 2: Connect the sensor 10: Connect the input and output cables 6 of the sensor 10 to a dedicated electronic converter with amplification and digital-to-analog conversion functions according to technical requirements;

[0042] Step 3: Test and Detection: Power on to test whether the circuit connection is normal. If the test is normal, proceed to step 4;

[0043] Step 4: Numerical detection: Add a small amount of stirring material to test whether the output stirring torque value changes normally.

[0044] In the present invention, the mounting base 1 adopts a rectangular base, and is installed and fixed by four auxiliary fixing bolts 101 and a main fixing bolt 102 that are symmetrically distributed in the center. The main fixing bolt 102 has a line center hole 108 in the center as a wiring hole for the input and output cables 6. Therefore, the main fixing bolt 102 has the functions of fixing and laying the line at the same time. The auxiliary fixing bolts 101 and the main fixing bolts 102 are both welded on the mounting base 1. The mounting base 1 is connected to the rear section 2 of the central axis body. The connection between the mounting base and the rear section of the central axis body is The main functions of the chamfer 103 are to increase the connection strength and to reduce the adhesion of materials. The sealing shell 8 connects the rear section 2 of the central axis body and the front section 7 of the central axis body. The rear connection seam 104 and the front connection seam 105 are both laser welded. It should be noted that cold welding technology should be used during welding to avoid damage to internal electronic components. The front section 7 of the central axis body is connected to the force plate 9. In this embodiment, two force plate connecting bolts 106 and two force plate connecting nuts 107 are used for connection. The sealing shell 8 contains an elastic connector 3 and a strain gauge. Component 4, transmitter PCB board 5, input and output cables, 6 are connected to the transmitter PCB board 5 through the line hole 108. The transmitter PCB board 5 is a printed circuit board with electronic components installed on it. Its main function is to convert and transmit the output signal of the strain gauge component 4 for output. The strain gauge component 4 includes four strain gauges and corresponding connecting wires, wherein: the first strain gauge 41 and the third strain gauge 43 are fixed to the upper plane of the elastic connector 3 with adhesive; the second strain gauge 42 and the fourth strain gauge 44 are fixed to the lower plane of the elastic connector 3 with adhesive; the output connecting wire of the strain gauge on the lower plane passes through the center line hole 109 of the elastic connector to connect to the transmitter PCB board 5, and at the same time, the output wire of the strain gauge on the upper plane is also connected to the transmitter PCB board 5, and then fixed with a flexible gel 11, so that the transmitter PCB board 5 is suspended in the flexible gel 11 and is located above the elastic connector 3. Before welding the rear end connection seam 104 and the front end connection seam 105, the internal space of the sealed housing 8 should be filled with the flexible gel 11 before welding.

[0045] The central axis is divided into two parts: the rear section 2 and the front section 7. The whole is cylindrical. The design diameter of the central axis should fully consider the sensor range, the actual maximum measurement torque, and the material strength factors. At the same time, the design area of ​​the force plate 9 also needs to be adjusted according to the different viscosity of the stirred materials and the sensor range. The three sensor ranges with more application scenarios: 2000Kg, 1000Kg, and 200Kg are listed to illustrate the design parameters of the central axis and the force plate of this embodiment.

[0046] Rated range Design length of the middle bracket Design diameter of the middle shaft Load plate size 2000Kg 90mm 32mm 160mm×240mm 1000Kg 80mm 28mm 140mm×220mm 200Kg 70mm 20mm 100mm×160mm

[0047] The strain gauge assembly 4 is a full-bridge structure, wherein: R1, the first strain gauge static resistance; R2, the second strain gauge static resistance; R3, the third strain gauge static resistance; R4, the fourth strain gauge static resistance; R5, the left arm temperature compensation resistance; R6, the right arm temperature compensation resistance; Ui, the input voltage; Uo, the output voltage, the four strain gauges all use the same model, and their initial static resistances are theoretically the same, and R5 and R6 are temperature compensation resistors with the same resistance value;

[0048] The relationship between the output voltage Uo and the input voltage Ui of the full-bridge strain gauge assembly 4 is briefly described below;

[0049] In this embodiment, the static resistances of R1, R2, R3, and R4 are theoretically equal and are represented by R, that is, R1 = R2 = R3 = R4 = R; the resistances of R5 and R6 are also the same, and the resistance value of the temperature compensation resistor is represented by Rm; that is, R5 = R6 = Rm. If the temperature effect is not considered,

[0050] When static:

[0051]

[0052] Dynamic:

[0053]

[0054] Simplified to:

[0055]

[0056] It can be seen that the output voltage is proportional to the algebraic sum of the resistance change rates of the four strain gauges. If the temperature compensation resistor is considered, the final output voltage is expressed as:

[0057]

[0058] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sensor for measuring stirring torque, comprising a sensor (10), characterized in that: The sensor (10) comprises a mounting base (1), a rear section of a central axis body (2), a front section of a central axis body (7), a sealing shell (8) and a force-bearing plate (9), one end of the mounting base (1) being connected to one end of the rear section of the central axis body (2), the other end of the rear section of the central axis body (2) being connected to one end of the sealing shell (8), the other end of the sealing shell (8) being connected to one end of the front section of the central axis body (7), the other end of the front section of the central axis body (7) being threadedly connected to two symmetrically arranged force-bearing plate connecting bolts (106), the front section of the central axis body (7) being connected to one end of the force-bearing plate (9) via the force-bearing plate connecting bolts (106). The inner wall of the sealing shell (8) is connected to the outer circumference of the rear section (2) of the central axis body, an elastic connector (3) is provided in the sealing shell (8), a strain gauge circuit (45) is installed in the sealing shell (8) and is located on one side and outside the elastic connector (3), a strain gauge assembly (4) is provided in the strain gauge circuit (45), one end of the elastic connector (3) is connected to one side of the rear section (2) of the central axis body, and the other end of the elastic connector (3) is connected to one side of the front section (7) of the central axis body, and the bottom ends of the two force-bearing plate connecting bolts (106) are both threadedly connected with force-bearing plate connecting nuts (107).

2. A sensor for measuring stirring torque according to claim 1, characterized in that: The strain gauge assembly (4) comprises a first strain gauge (41), a second strain gauge (42), a third strain gauge (43) and a fourth strain gauge (44); one side of the first strain gauge (41) is connected to one side of the top end of the elastic connector (3); one side of the second strain gauge (42) is connected to one side of the bottom end of the elastic connector (3); one side of the third strain gauge (43) is connected to the other side of the top end of the elastic connector (3); and one side of the fourth strain gauge (44) is connected to the other side of the bottom end of the elastic connector (3).

3. A sensor for measuring stirring torque according to claim 1, characterized in that: The interior of the sealed housing (8) is filled with a flexible gel (11), the top end of the elastic connector (3) is connected to a transmitter PCB board (5) via the flexible gel (11), and one end of the transmitter PCB board (5) is connected to an input / output cable (6) extending to the outside.

4. A sensor for measuring stirring torque according to claim 1, characterized in that: Both ends of the mounting and fixing seat (1) away from the rear section (2) of the central axis body are installed with symmetrically arranged auxiliary fixing bolts (101), and the middle part of the mounting and fixing seat (1) away from the rear section (2) of the central axis body is installed with a main fixing bolt (102).

5. A sensor for measuring stirring torque according to claim 1, characterized in that: Symmetrically arranged chamfers (103) are provided on both sides of the connection between the mounting fixing seat (1) and the rear section of the central axis body (2).

6. A sensor for measuring stirring torque according to claim 1, characterized in that: The sealing shell (8) is connected to the outer circumference of the front section (7) of the central axis body, a rear end connection seam (104) is provided on the outer side of the connection between the sealing shell (8) and the rear section (2) of the central axis body, and a front end connection seam (105) is provided on the outer side of the connection between the sealing shell (8) and the front section (7) of the central axis body.

7. A sensor for measuring stirring torque according to claim 1, characterized in that: A line center hole (108) is provided in the middle of the rear section (2) of the central axis body, and an elastic connecting body center line hole (109) is provided in the middle of the elastic connecting body (3).

8. A sensor for measuring stirring torque according to claim 1, characterized in that: The strain gauge circuit (45) comprises a first strain gauge static resistor R1 (451), a second strain gauge static resistor R2 (452), a third strain gauge static resistor R3 (453), a fourth strain gauge static resistor R4 (454), a left arm temperature compensation resistor R5 (455) and a right arm temperature compensation resistor R6 (456); the first strain gauge static resistor R1 (451), the second strain gauge static resistor R2 (452), the third strain gauge static resistor R3 (453) and the fourth strain gauge static resistor R4 (454) are connected in series; the connection between the first strain gauge static resistor R1 (451) and the fourth strain gauge static resistor R4 (454) is connected to One end of the left arm temperature compensation resistor R5 (455) is connected, the connection point between the second strain gauge static resistor R2 (452) and the third strain gauge static resistor R3 (453) is connected to one end of the right arm temperature compensation resistor R6 (456), an input voltage Ui (457) is connected between the right arm temperature compensation resistor R6 (456) and the left arm temperature compensation resistor R5 (455), and an output voltage Uo (458) is connected between the connection point between the first strain gauge static resistor R1 (451) and the second strain gauge static resistor R2 (452) and the connection point between the third strain gauge static resistor R3 (453) and the fourth strain gauge static resistor R4 (454).

9. A sensor for measuring stirring torque according to claim 1, characterized in that: The elastic connecting body (3) is a rectangular parallelepiped.

10. A method for using a sensor for measuring stirring torque according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1, installing and fixing the sensor (10): select a position on the circumferential outer wall of the stirring device to drill a hole. Before drilling, accurately measure the size of the sensor (10), then evenly apply a layer of sealant on the bottom of the installation and fixing seat (1) of the sensor (10), extend the fixing connecting bolts of the sensor (10) from the inside to the outside through the hole in the circumferential outer wall, and place the sensor (10) inside the stirring device. Use suitable nuts to connect the main fixing bolts (102) and the auxiliary fixing bolts (101), and tighten them; Step 2: Connect the sensor (10): Connect the input and output cables (6) of the sensor (10) to a dedicated electronic converter with amplification and digital-to-analog conversion functions according to technical requirements; Step 3: Test and Detection: Power on to test whether the circuit connection is normal. If the test is normal, proceed to step 4; Step 4: Numerical detection: Add a small amount of stirring material to test whether the output stirring torque value changes normally.

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