A device and method for measuring the tensile force of a transmission belt

Abstract

The present invention provides a device and a method for measuring the tensile force of a transmission belt, which includes a support, a driving wheel assembly, a measuring truss, a first driven wheel, a second driven wheel and a transmission belt. The measuring truss is of a triangular structure and fixedly connected to the support. The driving wheel assembly is arranged on the support and includes a driving wheel. The driving wheel, the first driven wheel and the second driven wheel are respectively arranged at the three vertices of the measuring truss and are connected by the transmission belt in a transmission manner. Two tension and compression sensors are arranged on each side of the measuring truss, and the central axis of the tension and compression sensor is parallel to the axis of the side of the measuring truss where it is located. The resultant force generated by the transmission belt on the measuring truss during the static and dynamic processes is measured by the tension and compression sensors, and then the tensile forces generated on different segments of the transmission belt are calculated according to the geometric relationship between the transmission belt and the measuring truss, thereby realizing the static and dynamic measurement of the tensile force of the transmission belt and having a wider application range.

Description

Technical Field

[0001] The present invention relates to the technical field of tensile force measuring devices, and particularly to a conveyor belt tensile force measuring device and a measuring method. Background Art

[0002] The belt drive system is an important way to transmit power and motion in mechanical drives. During the installation and operation of the conveyor belt, detecting and controlling the conveyor belt tensile force (also known as the tension force, tension, etc.) is of great significance for reducing slippage, increasing the service life of the belt, avoiding excessive force on the belt pulley, and ensuring the stability of the drive system.

[0003] As Figure 1 shown, when the conveyor belt is installed, the belt must be tensioned, that is, it is tightly sleeved on the two belt pulleys with a certain initial tensile force. At this time, the tensile forces in the conveyor belt are equal, both being the initial tensile force F0 (referred to as the tension force). Therefore, in the static state before the conveyor belt operates, the tensile force in the conveyor belt is constant. The measurement of this tensile force in the static state is relatively easy to achieve, and currently there are mainly two methods, namely contact type and non-contact type.

[0004] Contact measurement: According to "National Standard GB / T 13575.1 - 2008", use the measuring contact of the instrument to apply a force perpendicular to the belt edge at the midpoint of the span at the tangent points between the conveyor belt and the two belt pulleys, and obtain the tensile force of the belt through certain calculations.

[0005] Non-contact measurement: It includes acoustic wave type or optical wave type. Align the sensor measuring head of the instrument with the belt to be measured, tap the belt to make it vibrate, and indirectly measure the conveyor belt tensile force by measuring its vibration frequency and converting through a formula.

[0006] As Figure 2 shown, when the belt drive is operating, due to the action of the frictional force on the contact surface between the belt and the belt pulley, the side of the belt that enters the driving pulley is further tightened, and the tensile force increases from F0 to F1. This side is called the tight side; the other side is relaxed, and the tensile force drops from F0 to F2. This side is called the slack side. In the actual working process, affected by the torsional vibration of the driving pulley, the deformation of the conveyor belt, the slippage of the conveyor belt, etc., the tensile forces on the slack side and the tight side of the conveyor belt are constantly changing, and are significantly different in numerical value from the tensile force values measured in the static state of the above conveyor belt. Therefore, it is necessary to measure the tensile force of the conveyor belt in the moving state in real time, that is, to perform dynamic measurement on the conveyor belt.

[0007] However, both of the above two methods for measuring the tension of a stationary conveyor belt require the conveyor belt to be toggled during measurement, temporarily changing the position of the conveyor belt. This is not practical for a conveyor belt in a moving state because it will change the original motion characteristics of the conveyor belt and directly affect the measurement accuracy. In addition, directly and forcibly toggling a conveyor belt running at high speed may cause the conveyor belt to fall off or slip violently, posing a safety hazard. Therefore, the traditional methods are only applicable to the measurement of stationary conveyor belts. For a conveyor belt in a moving / working state, without disturbing the normal movement of the belt, the above traditional methods are not applicable and cannot perform dynamic measurement on the conveyor belt. Summary of the Invention

[0008] The technical problem to be solved by the present invention is: in order to overcome the deficiencies in the prior art, the present invention provides a device and a method for measuring the tension of a conveyor belt.

[0009] The technical solution adopted by the present invention to solve its technical problems is: a device for measuring the tension of a conveyor belt, including a support, a driving wheel assembly, a measuring truss, a first driven wheel, a second driven wheel and a conveyor belt. Among them, the measuring truss is in a triangular structure and is fixedly connected to the support. The driving wheel assembly is arranged on the support and includes a driving wheel. The driving wheel, the first driven wheel and the second driven wheel are respectively arranged at the three vertices of the measuring truss, that is, the intersection points of the three side axes of the measuring truss are the rotation centers of the driving wheel, the first driven wheel and the second driven wheel, and are connected by a conveyor belt. Two tension and compression sensors are provided on each side of the measuring truss, and the central axis of the tension and compression sensor is parallel to the axis of the side of the measuring truss where it is located.

[0010] And the following relationships are satisfied among the measuring truss, the driving wheel, the first driven wheel and the second driven wheel:

[0011]

[0012] In the formula, D is the diameter of the driving wheel, d1 is the diameter of the first driven wheel, d2 is the diameter of the second driven wheel, L1 is the center distance between the driving wheel and the first driven wheel, L2 is the center distance between the first driven wheel and the second driven wheel, L3 is the center distance between the driving wheel and the second driven wheel, α1 is the included angle between the longitudinal line of the conveyor belt between the driving wheel and the first driven wheel and the central axis of the tension and compression sensor on the same side, α2 is the included angle between the longitudinal line of the conveyor belt between the first driven wheel and the second driven wheel and the central axis of the tension and compression sensor on the same side, and α3 is the included angle between the longitudinal line of the conveyor belt between the driving wheel and the second driven wheel and the central axis of the tension and compression sensor on the same side.

[0013] Further, the driving wheel assembly includes a motor, a connecting component, a bearing seat, a bearing, a driving wheel pivot and a driving wheel. Among them, the connecting component includes a motor bracket and a coupling disposed inside the motor bracket, and the coupling inside can rotate relative to the external motor bracket around the axis. One end of the motor bracket is fixedly connected to the outer shell of the motor, and the other end is fixedly connected to the back surface of the vertical plate. The driving wheel pivot is rotatably connected to the driving wheel mounting hole of the vertical plate through the bearing and the bearing seat. One end of the driving wheel pivot passes through the bearing and is connected to the motor output shaft through the coupling. The other end of the driving wheel pivot is fixedly connected (such as key connection) to the driving wheel. One end of the coupling is fixedly connected to the motor output shaft, and the other end is fixedly connected to the driving wheel pivot. The driving connection between the motor output shaft and the driving wheel pivot is realized through the coupling.

[0014] Further, in order to support the two driven wheels and install the tension and compression sensors, the measuring truss is a double-layer triangular frame structure with inner and outer parallels, including a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a first tension and compression sensor, a second tension and compression sensor, a third tension and compression sensor, a fourth tension and compression sensor, a fifth tension and compression sensor, a sixth tension and compression sensor, a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a sleeve, a first driven wheel pivot and a second driven wheel pivot. Among them,

[0015] One end of the sleeve is fixed in the sleeve positioning circular groove on the vertical plate of the support, and the sleeve is coaxially arranged with the motor. The first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod are all V-shaped;

[0016] The first connecting rod, the first connecting rod, the third connecting rod and the third connecting rod are sequentially connected to form an outer triangular frame, and the ends of the first connecting rod and the third connecting rod are both connected to the outer wall of the sleeve. The included angle between the first connecting rod and the third connecting rod is β1. The first tension and compression sensor is connected between the first connecting rod and the first connecting rod, and the first tension and compression sensor is coaxially arranged with the first connecting rod. The third tension and compression sensor is connected between the third connecting rod and the third connecting rod, and the third tension and compression sensor is coaxially arranged with the third connecting rod. The fifth tension and compression sensor is connected between the first connecting rod and the third connecting rod;

[0017] The second connecting rod, the second connecting rod, the fourth connecting rod and the fourth connecting rod are sequentially connected to form an inner triangular frame, and the ends of the second connecting rod and the fourth connecting rod are both connected to the outer wall of the sleeve. The included angle between the second connecting rod and the fourth connecting rod is β1. The second tension and compression sensor is connected between the second connecting rod and the second connecting rod, and the second tension and compression sensor is coaxially arranged with the second connecting rod. The fourth tension and compression sensor is connected between the fourth connecting rod and the fourth connecting rod, and the fourth tension and compression sensor is coaxially arranged with the fourth connecting rod. The sixth tension and compression sensor is connected between the second connecting rod and the fourth connecting rod;

[0018] The first driven wheel pivot is arranged between the first transfer rod and the second transfer rod, and the second driven wheel pivot is arranged between the third transfer rod and the fourth transfer rod. The axes of the first driven wheel pivot and the second driven wheel pivot are parallel to the axis of the sleeve. The first driven wheel is rotatably installed on the first driven wheel pivot, and the second driven wheel is rotatably installed on the second driven wheel pivot.

[0019] The overall measurement truss is a double-layer structure. The sensors and connecting rods between the two layers are symmetrically arranged. A pulley is pivotally installed at the middle position between the two layers. The advantage of this structure is that if it is a single-layer structure, when measuring, the sensor will bear a huge bending moment from the pulley (the tension of the transmission belt is applied to the pulley), and this bending moment will reduce the measurement accuracy of the sensor. The double-layer structure will eliminate this bending moment, ensure the measurement accuracy, and at the same time make the overall structure more stable.

[0020] Furthermore, in order to reduce the structural connectors, both the first transfer rod and the third transfer rod are integral structures. Their structures both include rod one, rod two, and a pivot support seat. The pivot support seat is a cylindrical structure as a whole. One end of rod one and rod two are respectively connected to the outer wall of the pivot support seat, and the other ends of rod one and rod two are provided with external threaded shafts connected to the internal threaded holes at the center of the tension and compression sensor. A circular groove is opened at the center of the pivot support seat, and a circle of threaded holes is provided at the bottom of the circular groove for fixedly connecting with the flange at one end of the driven wheel pivot.

[0021] Specifically, the included angle formed by rod one and rod two of the first transfer rod is β2, and the included angle formed by rod one and rod two of the third transfer rod is β3. The magnitudes of β2 and β3 are equal or not equal.

[0022] Furthermore, in order to reduce the structural connectors, both the second transfer rod and the fourth transfer rod are integral structures. Their structures both include rod three, rod four, and a pivot connection block. The pivot connection block is a cylindrical structure as a whole. One end of rod three and rod four are respectively connected to the outer wall of the pivot connection block, forming a V shape, and the other ends of rod three and rod four are provided with external threaded shafts connected to the internal threaded holes at the center of the tension and compression sensor. A keyway hole is opened at the center of the pivot connection block for fixedly connecting with the other end of the driven wheel pivot.

[0023] Specifically, the included angle formed by rod three and rod four of the second transfer rod is β2, and the included angle formed by rod three and rod four of the fourth transfer rod is β3. The magnitudes of β2 and β3 are equal or not equal.

[0024] Furthermore, in order to achieve the installation and stable support of the measurement truss, the support includes a vertical plate and a bottom plate. The lower end of the vertical plate is connected to the bottom plate to form an L-shaped structure, and a reinforcing rib is provided between the back of the vertical plate and the bottom plate; a driving wheel installation hole is provided on the vertical plate, and a sleeve positioning circular groove is provided around the driving wheel installation hole.

[0025] Specifically, the first tensile and compressive force sensor, the second tensile and compressive force sensor, the third tensile and compressive force sensor, the fourth tensile and compressive force sensor, the fifth tensile and compressive force sensor, and the sixth tensile and compressive force sensor have the same structure. The overall shape is disc-shaped, with a first stress surface and a second stress surface provided at both ends respectively. The central axis is perpendicular to the first stress surface and the second stress surface, and a through internal threaded hole is provided along the central axis.

[0026] A method for measuring the tensile force of a transmission belt, which uses the above-mentioned measuring device for measurement, further includes the following measuring steps:

[0027] S1: According to the positional relationship between the transmission belt and the belt pulley, the part of the transmission belt between the driving pulley and the first driven pulley is called section I, the part of the transmission belt between the first driven pulley and the second driven pulley is called section II, and the part of the transmission belt between the driving pulley and the second driven pulley is called section III; the tension force on section I is denoted as F1, the tension force on section II is denoted as F2, and the tension force on section III is denoted as F3; the resultant force measured by the first tensile and compressive force sensor and the second tensile and compressive force sensor on the section I side is F a , the resultant force measured by the third tensile and compressive force sensor and the fourth tensile and compressive force sensor on the section III side is F b , the resultant force measured by the fifth tensile and compressive force sensor and the sixth tensile and compressive force sensor on the section II side is F c ;

[0028] S2: Measure and determine the diameter D of the driving pulley, the diameter d1 of the first driven pulley, the diameter d2 of the second driven pulley, the center distance L1 between the driving pulley and the first driven pulley, the center distance L2 between the first driven pulley and the second driven pulley, and the center distance L3 between the driving pulley and the second driven pulley. Then, according to formula (1), calculate the magnitudes of the included angles α1, α2, and α3 respectively;

[0029] S3: Regarding the entire measuring truss as a rigid body, according to the statics of rigid bodies, the following relationships exist for the measuring device:

[0030]

[0031] Based on this equation, the tensile forces F1, F2, and F3 on sections I, II, and III of the transmission belt corresponding to different states can be obtained;

[0032] S4: Measurement of the tensile force of the transmission belt

[0033] (1) Static measurement of the transmission belt: After the installation of the measuring device is completed, the motor is not started, and the resultant forces F a , F b , F c measured by the pressure sensors at this time are directly read, and the tensile forces F1, F2, and F3 on sections I, II, and III of the transmission belt under static conditions are calculated using the above formula (2);

[0034] (2) Dynamically measure the drive belt: Start the motor, drive the driving wheel to rotate clockwise / counterclockwise, simulate the operation of the drive belt, and record in real time the resultant force F of the two tension and compression sensors corresponding to each section on the drive belt at each time point during the operation process. a 、F b 、F c 's numerical values, and use the above formula (2) to calculate the tensions F1, F2, and F3 on sections I, II, and III of the drive belt at each time point under dynamic conditions.

[0035] The beneficial effects of the present invention are as follows: A drive belt tension measurement device and measurement method provided by the present invention indirectly detect the tension of the drive belt through a combination of multiple tension and compression sensors. During the normal operation process, regardless of how the operating conditions of the drive belt change, the tensions corresponding to different parts of the drive belt at each time point can be calculated in real time, thereby realizing the dynamic measurement of the drive belt tension. Both static and dynamic measurements of the drive belt can be achieved, and the application range is wider. Brief Description of the Drawings

[0036] The present invention will be further described below in conjunction with the drawings and embodiments.

[0037] Figure 1 is a schematic diagram of the tension of the drive belt in a stationary state.

[0038] Figure 2 is a schematic diagram of the tension of the belt drive in a working state.

[0039] Figure 3 is a three-dimensional structure schematic diagram of the measurement device.

[0040] Figure 4 is a three-dimensional structure schematic diagram of the measurement device.

[0041] Figure 5 is the front view of the measurement device.

[0042] Figure 6 is the rear view of the measurement device.

[0043] Figure 7 is the side view of the measurement device.

[0044] Figure 8 is the structural schematic diagram of the support.

[0045] Figure 9 is the three-dimensional structural schematic diagram of the driving wheel assembly.

[0046] Figure 10 is the front view structural schematic diagram of the driving wheel assembly.

[0047] Figure 11 is Figure 10 the sectional structural schematic diagram of A-A in

[0048] Figure 12 It is a three-dimensional structure schematic diagram of the measuring truss.

[0049] Figure 13 It is a three-dimensional structure schematic diagram of the measuring truss.

[0050] Figure 14 It is a front view structure schematic diagram of the measuring truss.

[0051] Figure 15 It is a structure schematic diagram of the tension and compression sensor.

[0052] Figure 16 It is a structure schematic diagram of the tension and compression sensor.

[0053] Figure 17 It is a structure schematic diagram of the driven wheel pivot.

[0054] Figure 18 It is a structure schematic diagram of the first connecting rod.

[0055] Figure 19 It is a structure schematic diagram of the second connecting rod.

[0056] Figure 20 It is a three-dimensional structure schematic diagram of the sleeve.

[0057] Figure 21 It is a front view of the sleeve.

[0058] Figure 22 It is a side view of the sleeve.

[0059] Figure 23 It is a schematic diagram of the principle of the measuring method.

[0060] In the figure: 1. Support, 1.1 Vertical plate, 1.2 Base plate, 1.3 Reinforcing rib, 1.4 Driving wheel mounting hole, 1.5 Sleeve positioning circular groove, 2. Driving wheel assembly, 2.1 Motor, 2.2 Connection assembly, 2.3 Bearing seat, 2.4 Bearing, 2.5 Driving wheel pivot, 2.6 Driving wheel, 3. Measuring truss, 3.1a First connecting rod, 3.1b Second connecting rod, 3.2a Third connecting rod, 3.2b Fourth connecting rod, 3.3a First tension and compression sensor, 3.3b Second tension and compression sensor, 3.3c Third tension and compression sensor, 3.3d Fourth tension and compression sensor, 3.3e Fifth tension and compression sensor, 3.3f Sixth tension and compression sensor, 3.31 First stress surface, 3.32 Second stress surface, 3.33 Central axis, 3.34 Internal thread hole, 3.4 First connecting rod, 3.41 Rod one, 3.42 Rod two, 3.43 Pivot support seat, 3.5 Second connecting rod, 3.51 Rod three, 3.52 Rod four, 3.53 Pivot connection block, 3.6 Third connecting rod, 3.7 Fourth connecting rod, 3.8 Sleeve, 3.81 Circular flange, 3.82 Reinforcing rib, 3.83 Connecting plate, 3.84 Groove, 3.9a First driven wheel pivot, 3.9b Second driven wheel pivot, 4. First driven wheel, 5. Second driven wheel, 6. Transmission belt, 7. Longitudinal line of the transmission belt, 8. Sensor central axis. Detailed implementation mode

[0061] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner. Therefore, they only show the components related to the present invention. Directions and references (such as up, down, left, right, etc.) can only be used to assist in the description of the features in the drawings. Therefore, the following detailed implementation mode is not adopted in a restrictive sense, and the scope of the claimed subject matter is only defined by the appended claims and their equivalent forms.

[0062] As Figures 3 - 7As shown in the figure, a device for measuring the tensile force of a transmission belt according to the present invention includes a support 1, a driving wheel assembly 2, a measuring truss 3, a first driven wheel 4, a second driven wheel 5, and a transmission belt 6. Among them, the measuring truss 3 has a triangular structure and is fixedly connected to the support 1. The driving wheel assembly 2 is arranged on the support 1 and includes a driving wheel 2.6. The driving wheel 2.6, the first driven wheel 4, and the second driven wheel are respectively arranged at the three vertices of the measuring truss 3, that is, the intersection points of the three side axes of the measuring truss 3 are the rotation centers of the driving wheel 2.6, the first driven wheel 4, and the second driven wheel, and are connected by a transmission belt 6. Two tension and compression sensors are arranged on each side of the measuring truss 3, and the central axis 8 of the tension and compression sensor is parallel to the axis of the side of the measuring truss 3 where it is located. In this embodiment, both the first driven wheel 4 and the second driven wheel 5 are ordinary belt wheels, with a circular hole in the center and an embedded bearing.

[0063] As Figure 8 shown, the support 1 includes a vertical plate 1.1 and a bottom plate 1.2. The vertical plate 1.1 and the bottom plate 1.2 are integrally rectangular plates and are perpendicular to each other. The lower end of the vertical plate 1.1 is connected to the bottom plate 1.2 to form an L-shaped structure. The vertical plate 1.1 is an installation platform for other components, with a front side and a back side. And there is a reinforcing rib 1.3 between the back side of the vertical plate 1.1 and the bottom plate 1.2. The components such as the vertical plate 1.1, the bottom plate 1.2, and the reinforcing rib 1.3 can be fixed by screws or welding. A driving wheel mounting hole 1.4 is opened on the vertical plate 1.1. An outer sleeve positioning circular groove 1.5 is provided around the driving wheel mounting hole 1.4. Threaded holes are processed around the driving wheel mounting hole 1.4 and the outer sleeve positioning circular groove 1.5 to ensure that the driving wheel mounting hole 1.4 and the outer sleeve positioning circular groove 1.5 are strictly concentric.

[0064] As Figures 9 - 11As shown in the figure, the driving wheel assembly 2 includes a motor 2.1, a connecting assembly 2.2, a bearing seat 2.3, a bearing 2.4, a driving wheel pivot 2.5 and a driving wheel 2.6. Among them, the connecting assembly 2.2 includes a motor bracket and a coupling arranged inside the motor bracket, and the coupling inside can rotate relative to the external motor bracket around the axis. One end of the motor bracket is fixedly connected to the outer shell of the motor 2.1, and the other end is fixedly connected to the back of the vertical plate 1.1. The driving wheel 2.6 is an ordinary pulley with a circular hole in the center for connecting with the driving wheel pivot 2.5. The motor bracket is installed on the reverse side of the vertical plate 1.1, and the driving wheel pivot 2.5 is a round shaft. The bearing seat 2.3 passes through the driving wheel mounting hole 1.4 on the vertical plate 1.1 as a whole. It is a circular cylinder as a whole, with a bearing 2.4 installed on its inner wall. One end of the bearing seat 2.3 is flange-shaped and is installed on the front of the vertical plate 1.1 by screws. The driving wheel pivot 2.5 is rotationally connected to the driving wheel mounting hole 1.4 of the vertical plate 1.1 through the bearing 2.4 and the bearing seat 2.3. One end of the driving wheel pivot 2.5 passes through the bearing 2.4 and is connected to the output shaft of the motor 2.1 through the coupling. The other end of the driving wheel pivot 2.5 is fixedly connected (such as key connection) to the driving wheel 2.6. One end of the coupling is fixedly connected to the output shaft of the motor 2.1, and the other end is fixedly connected to the driving wheel pivot 2.5. The transmission connection between the output shaft of the motor 2.1 and the driving wheel pivot 2.5 is realized through the coupling. During installation, it is strictly ensured that the driving wheel 2.6 is concentric with the driving wheel mounting hole 1.4. During operation, the motor 2.1 drives the driving wheel 2.6 to rotate clockwise / counterclockwise.

[0065] As Figures 12 - 14As shown, the measuring truss 3 is a double-layer triangular truss structure with parallel inner and outer layers, including a first connecting rod 3.1a, a second connecting rod 3.1b, a third connecting rod 3.2a, a fourth connecting rod 3.2b, a first tension-compression sensor 3.3a, a second tension-compression sensor 3.3b, a third tension-compression sensor 3.3c, a fourth tension-compression sensor 3.3d, a fifth tension-compression sensor 3.3e, a sixth tension-compression sensor 3.3f, a first connecting rod 3.4, a second connecting rod 3.5, a third connecting rod 3.6, a fourth connecting rod 3.7, a sleeve 3.8, a first driven wheel pivot 3.9a and a second driven wheel pivot 3.9b. Each component is fixedly connected to form a rigid body. Among them, the structures of the first connecting rod 3.1a, the second connecting rod 3.1b, the third connecting rod 3.2a and the fourth connecting rod 3.2b are similar. One end is provided with a screw flange, the middle part is a round shaft, and the other end is an external thread shaft structure. The external thread shaft is connected to the internal thread hole at the center of the tension-compression sensor, and the force of the connecting rod can be transmitted to the tension-compression sensor.The first transfer rod 3.4, the second transfer rod 3.5, the third transfer rod 3.6 and the fourth transfer rod 3.7 are all V-shaped; the first connecting rod 3.1a, the first transfer rod 3.4, the third transfer rod 3.6, and the third connecting rod 3.2a are connected in sequence to form an outer tripod, and the ends of the first connecting rod 3.1a and the third connecting rod 3.2a are both connected to the outer wall of the sleeve 3.8. The included angle between the first connecting rod 3.1a and the third connecting rod 3.2a is β1; the first tension-compression sensor 3.3a is connected between the first connecting rod 3.1a and the first transfer rod 3.4, and the first tension-compression sensor 3.3a is coaxially arranged with the first connecting rod 3.1a; the third tension-compression sensor 3.3c is connected between the third connecting rod 3.2a and the third transfer rod 3.6, and the third tension-compression sensor 3.3c is coaxially arranged with the third connecting rod 3.2a; the fifth tension-compression sensor 3.3e is connected between the first transfer rod 3.4 and the third transfer rod 3.6; the second connecting rod 3.1b, the second transfer rod 3.5, the fourth transfer rod 3.7, and the fourth connecting rod 3.2b are connected in sequence to form an inner tripod, and the ends of the second connecting rod 3.1b and the fourth connecting rod 3.2b are both connected to the outer wall of the sleeve 3.8. The included angle between the second connecting rod 3.1b and the fourth connecting rod 3.2b is β1; the second tension-compression sensor 3.3b is connected between the second connecting rod 3.1b and the second transfer rod 3.5, and the second tension-compression sensor 3.3b is coaxially arranged with the second connecting rod 3.1b; the fourth tension-compression sensor 3.3d is connected between the fourth connecting rod 3.2b and the fourth transfer rod 3.7, and the fourth tension-compression sensor 3.3d is coaxially arranged with the fourth connecting rod 3.2b; the sixth tension-compression sensor 3.3f is connected between the second transfer rod 3.5 and the fourth transfer rod 3.7; the first driven wheel pivot 3.9a is arranged between the first transfer rod 3.4 and the second transfer rod 3.5, and the second driven wheel pivot 3.9b is arranged between the third transfer rod 3.6 and the fourth transfer rod 3.7. The axes of the first driven wheel pivot 3.9a and the second driven wheel pivot 3.9b are parallel to the axis of the sleeve 3.8. The first driven wheel 4 is rotatably installed on the first driven wheel pivot 3.9a, and the second driven wheel 5 is rotatably installed on the second driven wheel pivot 3.9b.

[0066] As Figure 15 and Figure 16 shown, the structures of the first tension-compression sensor 3.3a, the second tension-compression sensor 3.3b, the third tension-compression sensor 3.3c, the fourth tension-compression sensor 3.3d, the fifth tension-compression sensor 3.3e, and the sixth tension-compression sensor 3.3f are the same. They are of a conventional structure, integrally circular cake-shaped, with a first force-receiving surface 3.31 and a second force-receiving surface 3.32 provided at both ends respectively. The central axis 3.33 is perpendicular to the first force-receiving surface 3.31 and the second force-receiving surface 3.32, and a through internal threaded hole 3.34 is provided along the central axis 3.33.

[0067] AsFigure 17 As shown, the structures of the first driven wheel pivot 3.9a and the second driven wheel pivot 3.9b are the same. They are stepped shafts as a whole. One end is provided with a keyway and is press-fitted with a key, and the other end is a circular flange structure with a through hole.

[0068] As Figure 18 shown, the first transfer rod 3.4 is V-shaped as a whole and is fixedly connected by rod one 3.41, rod two 3.42 and pivot support seat 3.43. Among them, the main bodies of rod one 3.41 and rod two 3.42 are optical shafts, and there is a specified angle β2 between their central axes. The end faces of the optical shafts are processed into external threaded shafts and are fixedly connected to the above-mentioned tensile and compressive force sensors; the pivot support seat 3.43 is a cylindrical structure as a whole. One end of rod one 3.41 and rod two 3.42 are respectively connected to the outer wall of the pivot support seat 3.43, and the other ends of rod one 3.41 and rod two 3.42 are provided with external threaded shafts connected to the internal threaded holes at the center of the tensile and compressive force sensors. A circular groove is opened at the center of the pivot support seat 3.43, and a circle of threaded holes is provided at the bottom of the circular groove for fixedly connecting to the flange at one end of the driven wheel pivot.

[0069] The structure of the third transfer rod 3.6 is basically the same as that of the first transfer rod 3.4. The angle formed by rod one 3.41 and rod two 3.42 of the third transfer rod 3.6 is β3. The difference between them is that the lengths of rod one 3.41 and rod two 3.42 of the first transfer rod 3.4 and the lengths of rod one 3.41 and rod two 3.42 of the third transfer rod 3.6 may be different, and the magnitudes of the angles β2 and β3 may be equal or not equal. Therefore, the structure of the third transfer rod 3.6 will not be elaborated here.

[0070] As Figure 19 shown, the second transfer rod 3.5 is parallel to the first transfer rod 3.4 and includes rod three 3.51, rod four 3.52 and pivot connection block 3.53. It is V-shaped as a whole and is fixedly connected by rod three 3.51, rod four 3.52 and pivot connection block 3.53. Among them, the main bodies of rod three 3.51 and rod four 3.52 are optical shafts, and there is a specified angle β2 between their central axes. The end faces of the optical shafts are processed into external threaded shafts and are fixedly connected to the above-mentioned tensile and compressive force sensors; the pivot connection block 3.53 is a cylindrical structure as a whole. One end of rod three 3.51 and rod four 3.52 are respectively connected to the outer wall of the pivot connection block 3.53 to form a V shape, and the other ends of rod three 3.51 and rod four 3.52 are provided with external threaded shafts connected to the internal threaded holes at the center of the tensile and compressive force sensors. A keyway hole is opened at the center of the pivot connection block 3.53 for fixedly connecting to the other end of the driven wheel pivot.

[0071] The structure of the fourth connecting rod 3.7 is basically the same as that of the second connecting rod 3.5. The fourth connecting rod 3.7 is parallel to the third connecting rod 3.6. Therefore, the included angle formed by the rod three 3.51 and the rod four 3.52 of the fourth connecting rod 3.7 is β3. The difference between them is that the lengths of the rod three 3.51 and the rod four 3.52 of the second connecting rod 3.5 may be different from those of the rod three 3.51 and the rod four 3.52 of the fourth connecting rod 3.7, and the magnitudes of the included angles β2 and β3 may be equal or not equal. Therefore, the structure of the fourth connecting rod 3.7 will not be elaborated here.

[0072] As Figures 20 - 22 shown, the sleeve 3.8 is integrally composed of a circular flange 3.81, two connecting plates 3.83, and two reinforcing ribs 3.82; the circular flange 3.81 is in the shape of a pipe flange as a whole, and a section of groove is cut at a certain angle on the upper part to form a cut groove 3.84; along the uncut part of the upper part of the groove 3.84, two connecting plates 3.83 and two reinforcing ribs 3.82 are welded; circular positioning grooves and a circle of threaded holes are opened on the connecting plate 3.83 for fixedly connecting the flange ends of the first connecting rod 3.1a, the first connecting rod, the third connecting rod, and the fourth connecting rod; a circular positioning boss and a circle of through holes are machined at the bottom of the sleeve 3.8, and the circular positioning boss is in close fit with the sleeve positioning circular groove 1.5 on the above-mentioned support 1 to ensure that the axis of the sleeve 3.8 is coaxial with the driving wheel mounting hole 1.4, so that the sleeve 3.8 is coaxially arranged with the motor 2.1; the sleeve 3.8 and the entire measuring truss 3 are fixed on the support 1 through the threaded holes. Note: To ensure the force measurement accuracy, during installation, the central axis 8 of the sensor needs to coincide with the central axes of each rod, and at the same time, the central axes of each rod point to the center of the sleeve 3.8, and then the central axis 8 of the sensor points to the center of each pulley.

[0073] As Figure 23 shown, a method for measuring the tension of a transmission belt uses the above-mentioned measuring device to measure the tension of the transmission belt. After installing the measuring device, in order to eliminate the influence of gravity and the internal force of the measuring truss 3 on the measurement result, the six tension and compression sensors in the measuring truss 3 are zeroed. It should be noted that the installation of the measuring device here refers to the installation of other components except the transmission belt, that is, the tension and compression sensors are zeroed before installing the transmission belt, and then when testing, the transmission belt is installed on the measuring device. Since the mass of the transmission belt itself is relatively small compared to the masses of other components of the measuring device, its influence on the measurement result is also relatively small and can be ignored.

[0074] This measurement method further includes the following steps:

[0075] S1: According to the positional relationship between the transmission belt 6 and the belt pulleys, the part of the transmission belt 6 between the driving pulley 2.6 and the first driven pulley 4 is called section I, the part of the transmission belt 6 between the first driven pulley 4 and the second driven pulley 5 is called section II, and the part of the transmission belt 6 between the driving pulley 2.6 and the second driven pulley 5 is called section III; the tension force on section I is denoted as F1, the tension force on section II is denoted as F2, and the tension force on section III is denoted as F3; the resultant force measured by the first tension and compression sensor 3.3a and the second tension and compression sensor 3.3b on the section I side is F a , and the resultant force measured by the third tension and compression sensor 3.3c and the fourth tension and compression sensor 3.3d on the section III side is F b , and the resultant force measured by the fifth tension and compression sensor 3.3e and the sixth tension and compression sensor 3.3f on the section II side is F c ;

[0076] Then, the following relationships are satisfied among the measuring truss 3, the driving pulley 2.6, the first driven pulley 4, and the second driven pulley 5:

[0077]

[0078] In the formula, D is the diameter of the driving pulley 2.6, d1 is the diameter of the first driven pulley 4, d2 is the diameter of the second driven pulley 5, L1 is the center distance between the driving pulley 2.6 and the first driven pulley 4, L2 is the center distance between the first driven pulley 4 and the second driven pulley 5, L3 is the center distance between the driving pulley 2.6 and the second driven pulley 5, α1 is the angle between the longitudinal line 7 of the transmission belt between the driving pulley 2.6 and the first driven pulley 4 and the central axis 8 of the tension and compression sensor on the same side, α2 is the angle between the longitudinal line 7 of the transmission belt between the first driven pulley 4 and the second driven pulley 5 and the central axis 8 of the tension and compression sensor on the same side, and α3 is the angle between the longitudinal line 7 of the transmission belt between the driving pulley 2.6 and the second driven pulley 5 and the central axis 8 of the tension and compression sensor on the same side.

[0079] Through formula (1), the angle between the longitudinal line 7 of the transmission belt in different sections and its corresponding sensor central axis 8 can be calculated.

[0080] S2: Measure the parameters of each component in the measuring device to determine the diameter D of the driving pulley 2.6, the diameter d1 of the first driven pulley 4, the diameter d2 of the second driven pulley 5, the center distance L1 between the driving pulley 2.6 and the first driven pulley 4, the center distance L2 between the first driven pulley 4 and the second driven pulley 5, and the center distance L3 between the driving pulley 2.6 and the second driven pulley 5. Then, calculate the magnitudes of the angles α1, α2, and α3 respectively according to formula (1);

[0081] S3: Regarding the entire measuring truss 3 as a rigid body, according to the statics of rigid bodies, the following relationships exist in the measuring device:

[0082]

[0083] According to this equation, the tensions F1, F2, and F3 on sections Ⅰ, Ⅱ, and Ⅲ of the transmission belt 6 in different states can be obtained.

[0084] S4: Measurement of the tension of the transmission belt 6

[0085] (1) Static measurement of the transmission belt 6: After the installation of the transmission belt 6 is completed, the motor 2.1 is not started, and the resultant force F measured by the pressure sensor at this time is directly read. a 、F b 、F c , and the tensions F1, F2, and F3 on sections Ⅰ, Ⅱ, and Ⅲ of the transmission belt 6 in the static state are calculated using the above formula (2).

[0086] (2) Dynamic measurement of the transmission belt 6: The motor 2.1 is started to drive the driving wheel 2.6 to rotate clockwise / counterclockwise to simulate the operation of the transmission belt 6, and the resultant forces F of the two tension and pressure sensors corresponding to each section of the transmission belt 6 at each time point during the operation process are recorded in real time. a 、F b 、F c The values of are used to calculate the tensions F1, F2, and F3 on sections Ⅰ, Ⅱ, and Ⅲ of the transmission belt 6 at each time point in the dynamic state using the above formula (2).

[0087] The key points of the present invention are: measuring the double-layer structure of the entire measuring truss 3, measuring the internal structure of the measuring truss 3, the installation positions of the sensors relative to the pulley, that is, the axis points to the center of the pulley; measuring the installation position of the measuring truss 3 relative to the driving wheel 2.6, that is, concentric installation.

[0088] As an example, the above structure is composed of one driving wheel 2.6 and two driven wheels. The present invention has no requirement for the number of driven wheels, and the number of driven wheels can be increased or decreased arbitrarily. After changing the number of driven wheels, only the number of connecting rods, sensors, and pivot shafts inside the measuring truss 3 needs to be changed to meet the measurement requirements. For example, after increasing the number of driven wheels from 2 to 3, only the number of sensors needs to be increased to 8, the number of connecting rods to 6, and the number of pivot shafts to 3, and then they can be recombined. At the same time, several more structural dimensions (the above angles and center distances) are measured during the measurement.

[0089] Inspired by the above ideal embodiments according to the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the scope of the present invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A device for measuring the tensile force of a transmission belt, characterized in that: It includes a support, a driving wheel assembly, a measuring truss, a first driven wheel, a second driven wheel and a transmission belt. Among them, the measuring truss is in a triangular structure and fixedly connected to the support. The driving wheel assembly is arranged on the support and includes a driving wheel. The driving wheel, the first driven wheel and the second driven wheel are respectively arranged at the three vertices of the measuring truss and are connected by the transmission belt. Two tension and compression sensors are arranged on each side of the measuring truss, and the central axis of the tension and compression sensor is parallel to the axis of the side of the measuring truss where it is located. And the following relationships are satisfied among the measuring truss, the driving wheel, the first driven wheel and the second driven wheel: In the formula, D is the diameter of the driving wheel, d1 is the diameter of the first driven wheel, d2 is the diameter of the second driven wheel, L1 is the center distance between the driving wheel and the first driven wheel, L2 is the center distance between the first driven wheel and the second driven wheel, L3 is the center distance between the driving wheel and the second driven wheel, α1 is the angle between the longitudinal line of the transmission belt between the driving wheel and the first driven wheel and the central axis of the tension and compression sensor on the same side, α2 is the angle between the longitudinal line of the transmission belt between the first driven wheel and the second driven wheel and the central axis of the tension and compression sensor on the same side, and α3 is the angle between the longitudinal line of the transmission belt between the driving wheel and the second driven wheel and the central axis of the tension and compression sensor on the same side. The measuring truss is a double-layer triangular frame structure with inner and outer parallels, including a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a first tension and compression sensor, a second tension and compression sensor, a third tension and compression sensor, a fourth tension and compression sensor, a fifth tension and compression sensor, a sixth tension and compression sensor, a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a sleeve, a first driven wheel pivot and a second driven wheel pivot. Among them, One end of the sleeve is fixed on the vertical plate of the support, and the sleeve is coaxially arranged with the motor. The first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod are all V-shaped. The first connecting rod, the first connecting rod, the third connecting rod and the third connecting rod are sequentially connected to form an outer triangular frame, and the ends of the first connecting rod and the third connecting rod are both connected to the outer wall of the sleeve. The included angle between the first connecting rod and the third connecting rod is β1. The first tension and compression sensor is connected between the first connecting rod and the first connecting rod, and the first tension and compression sensor is coaxially arranged with the first connecting rod. The third tension and compression sensor is connected between the third connecting rod and the third connecting rod, and the third tension and compression sensor is coaxially arranged with the third connecting rod. The fifth tension and compression sensor is connected between the first connecting rod and the third connecting rod. The second connecting rod, the second connecting rod, the fourth connecting rod and the fourth connecting rod are sequentially connected to form an inner triangular frame, and the ends of the second connecting rod and the fourth connecting rod are both connected to the outer wall of the sleeve. The included angle between the second connecting rod and the fourth connecting rod is β1. The second tension and compression sensor is connected between the second connecting rod and the second connecting rod, and the second tension and compression sensor is coaxially arranged with the second connecting rod. The fourth tension and compression sensor is connected between the fourth connecting rod and the fourth connecting rod, and the fourth tension and compression sensor is coaxially arranged with the fourth connecting rod. The sixth tension and compression sensor is connected between the second connecting rod and the fourth connecting rod. The first driven wheel pivot is arranged between the first transfer rod and the second transfer rod, and the second driven wheel pivot is arranged between the third transfer rod and the fourth transfer rod. The axes of the first driven wheel pivot and the second driven wheel pivot are parallel to the axis of the sleeve. The first driven wheel is rotatably mounted on the first driven wheel pivot, and the second driven wheel is rotatably mounted on the second driven wheel pivot.

2. The belt tension measuring device according to claim 1, characterized in that: The driving wheel assembly includes a motor, a connection assembly, a bearing seat, a bearing, a driving wheel pivot and a driving wheel. Among them, the connection assembly includes a motor bracket and a coupling arranged inside the motor bracket, and the coupling inside can rotate relative to the external motor bracket around the axis. One end of the motor bracket is fixedly connected to the outer shell of the motor, and the other end is fixedly connected to the back of the vertical plate. The driving wheel pivot is rotatably connected to the driving wheel mounting hole of the vertical plate through a bearing and a bearing seat. One end of the driving wheel pivot passes through the bearing and is connected to the motor output shaft through a coupling, and the other end of the driving wheel pivot is fixedly connected to the driving wheel.

3. The belt tension measuring device according to claim 1, characterized in that: The structures of the first transfer rod and the third transfer rod both include a rod one, a rod two and a pivot support seat. The pivot support seat is a cylindrical structure as a whole. One end of the rod one and the rod two are respectively connected to the outer wall of the pivot support seat, and the other ends of the rod one and the rod two are provided with external threaded shafts connected to the internal threaded holes at the center of the tensile and compressive force sensors. A circular groove is opened at the center of the pivot support seat, and a circle of threaded holes is provided at the bottom of the circular groove for fixedly connecting with the flange at one end of the driven wheel pivot.

4. The belt tension measuring device according to claim 3, characterized in that: The included angle formed by the rod one and the rod two of the first transfer rod is β2, and the included angle formed by the rod one and the rod two of the third transfer rod is β3. The magnitudes of β2 and β3 are equal or not equal.

5. The belt tension measuring device according to claim 1, characterized in that: The structures of the second transfer rod and the fourth transfer rod both include a rod three, a rod four and a pivot connection block. The pivot connection block is a cylindrical structure as a whole. One end of the rod three and the rod four are respectively connected to the outer wall of the pivot connection block, forming a V shape, and the other ends of the rod three and the rod four are provided with external threaded shafts connected to the internal threaded holes at the center of the tensile and compressive force sensors. A keyway hole is opened at the center of the pivot connection block for fixedly connecting with the other end of the driven wheel pivot.

6. The belt tension measuring device according to claim 5, wherein: The included angle formed by the rod three and the rod four of the second transfer rod is β2, and the included angle formed by the rod three and the rod four of the fourth transfer rod is β3. The magnitudes of β2 and β3 are equal or not equal.

7. The belt tension measuring device according to claim 1, characterized in that: The support includes a vertical plate and a bottom plate. The lower end of the vertical plate is connected to the bottom plate to form an L-shaped structure, and a reinforcing rib is provided between the back of the vertical plate and the bottom plate. The vertical plate is provided with a driving wheel mounting hole, and a sleeve positioning circular groove is provided around the driving wheel mounting hole.

8. The belt tension measuring device according to claim 1, characterized in that: The structures of the first tensile and compressive force sensor, the second tensile and compressive force sensor, the third tensile and compressive force sensor, the fourth tensile and compressive force sensor, the fifth tensile and compressive force sensor and the sixth tensile and compressive force sensor are the same. The whole is in a round cake shape, and the first stress surface and the second stress surface are respectively provided at both ends. The central axis is perpendicular to the first stress surface and the second stress surface, and a through internal threaded hole is provided along the central axis.

9. A method for measuring the tensile force of a transmission belt, characterized in that: When measuring by using the measuring device according to any one of claims 1-8, the following measuring steps are further included: S1: According to the positional relationship between the transmission belt and the belt pulley, the transmission belt part between the driving pulley and the first driven pulley is called section I, the transmission belt part between the first driven pulley and the second driven pulley is called section II, and the transmission belt part between the driving pulley and the second driven pulley is called section III; the tension on section I is denoted as F1, the tension on section II is denoted as F2, and the tension on section III is denoted as F3; the resultant force measured by the first and second tension and compression sensors on the section I side is F a , the resultant force measured by the third and fourth tension and compression sensors on the section III side is F b , the resultant force measured by the fifth and sixth tension and compression sensors on the section II side is F c ; S2: Measure and determine the diameter D of the driving wheel, the diameter d1 of the first driven wheel, the diameter d2 of the second driven wheel, the center distance L1 between the driving wheel and the first driven wheel, the center distance L2 between the first driven wheel and the second driven wheel, and the center distance L3 between the driving wheel and the second driven wheel. Then, calculate the magnitudes of the included angles α1, α2, and α3 respectively according to formula (1); S3: Regarding the entire measuring truss as a rigid body, according to the statics of rigid bodies, the following relationships exist for the measuring device: Among them, the included angles formed by rod 1 and rod 2 of the first connecting rod and the included angles formed by rod 3 and rod 4 of the second connecting rod are both β2, and the included angles formed by rod 1 and rod 2 of the third connecting rod and the included angles formed by rod 3 and rod 4 of the fourth connecting rod are both β3; According to the above formula (2), the tensions F1, F2, and F3 on the corresponding sections Ⅰ, Ⅱ, and Ⅲ of the transmission belt in different states can be obtained; S4: Measurement of the tension of the transmission belt (1) Static measurement of the transmission belt: After the installation of the measuring device, the motor is not started, and the resultant force F measured by the pressure sensor at this time is directly read a , F b , F c . Using the above formula (2), the tensions F1, F2, and F3 on sections Ⅰ, Ⅱ, and Ⅲ of the transmission belt under static conditions are calculated; (2) Dynamic measurement of the conveyor belt: Start the motor, drive the driving wheel to rotate clockwise / counterclockwise, simulate the operation of the conveyor belt, and record in real time the resultant force F of the two tension and compression sensors corresponding to each section on the conveyor belt at each time point during the operation process. a , F b , F c values, and use the above formula (2) to calculate the tensions F1, F2, and F3 on sections I, II, and III of the conveyor belt at each time point under dynamic conditions.

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