Device for accurately testing static braking torque of brake

Abstract

The invention provides a device for accurately testing the static braking torque of a brake, and the device is provided with an adjustable extension rod, a torque and rotating speed sensor, and a photoelectric rotary encoder. The problems that in an existing brake static braking torque test, force application is not accurate, electric cylinder stroke adaptability is poor, data comparison is lacked, and consequently experiment accuracy is insufficient are effectively solved, a powerful guarantee is provided for accurately testing the brake static braking torque, the performance detection level of a brake is improved, and the test efficiency is improved. And accurate data support is provided for product quality control and research and development decision in related industries.

Description

Technical Field

[0001] The invention relates to the technical field of torque testing, and in particular to a device for accurately testing the static braking torque of a brake. Background Art

[0002] During the static braking torque test, the length of the lever arm must be accurately measured to control its accuracy. In general, the length of the lever arm is usually kept constant to avoid errors in the calculation results caused by changes in the lever arm. Currently, common methods of applying external force include palletizing, hydraulics, and electric cylinders. The following problems exist in the current application of external force:

[0003] 1. The hydraulic method has poor accuracy and results in large test errors in industries such as electronic equipment manufacturing and precision instrument testing.

[0004] 2. In the electric cylinder method experiment, different models of electric cylinders correspond to different electric cylinder travel distances. The electric cylinder travel is too short to meet the movement requirements of the equipment. The electric cylinder model needs to be replaced, which increases the complexity and cost of the test.

[0005] 3. The testing process lacks data comparison at both ends. Summary of the invention

[0006] The purpose of the present invention is to provide a device for accurately testing the static braking torque of a brake, so as to solve the problems existing in the existing static braking torque test.

[0007] The present invention provides a device for accurately testing the static braking torque of a brake, comprising a frame, a workbench arranged at the upper end of the frame, a support plate arranged on the workbench, a transition connection plate arranged on the support plate, a torque speed sensor arranged on one side of the transition connection plate, a torque evaluation unit arranged on the lower side of the torque speed sensor, a coupling connected to the torque speed sensor, a main shaft connected to the coupling, a photoelectric rotary encoder arranged at the end of the main shaft, a swing arm connected to the main shaft, an adjustable extension rod rotatably connected to the lower end of the swing arm, a tension sensor arranged at one end of the adjustable extension rod, an electric cylinder connected to the tension sensor, and a control component, wherein one end of the main shaft is connected to the torque speed sensor through the coupling, and the other end is connected to the photoelectric rotary encoder, the tension sensor is installed at the front end of the electric cylinder and is connected to the adjustable extension rod through a connecting shaft, and the other end of the adjustable extension rod is connected to the swing arm.

[0008] The above-mentioned device for accurately testing the static braking torque of the brake, by setting an adjustable extension rod, a torque speed sensor, and a photoelectric rotary encoder, effectively solves the problems existing in the existing static braking torque test of the brake, such as inaccurate force application, poor adaptability of the electric cylinder stroke, and insufficient experimental accuracy due to lack of data comparison. It provides a strong guarantee for the accurate testing of the static braking torque of the brake, helps to improve the performance detection level of the brake, and provides accurate data support for product quality control and R&D decisions in related industries.

[0009] Furthermore, the control assembly includes an electrical control box and control buttons and a display screen connected to the electrical control box.

[0010] Furthermore, an outer cover is provided at the upper end of the support plate, a cover plate is provided at the upper end of the outer cover, and the torque and speed sensor, the torque evaluation unit, the main shaft and the photoelectric rotary encoder are all arranged in the outer cover.

[0011] Furthermore, a first platform and a second platform are provided at the upper end of the frame, and the support plate is provided on the first platform.

[0012] Furthermore, a mounting guide plate is respectively provided on the upper side of each of the first platforms.

[0013] Furthermore, a walking assembly is provided at the lower end of the frame.

[0014] Furthermore, the traveling assembly is a plurality of Forma wheels.

[0015] Furthermore, the main shaft is fixed on the workbench through a bearing mounting mechanism.

[0016] Furthermore, the bearing installation mechanism includes two support seats arranged at intervals and two bearing seats arranged on the two support seats.

[0017] Furthermore, the electric cylinder is installed on the frame through a push rod base. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the device for accurately testing the static braking torque of a brake in the first embodiment of the present invention at a first viewing angle;

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the device for accurately testing the static braking torque of a brake in the first embodiment of the present invention at a second viewing angle;

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of the device for accurately testing the static braking torque of a brake in the second embodiment of the present invention at a first viewing angle.

[0021] Description of main component symbols:

[0022] frame 10 Couplings 70 Push rod base 131 Workbench 20 Spindle 80 Control components 140 First Platform 21 Support seat 81 Electrical control box 141 Second platform 22 Bearing seat 82 Control buttons 142 Guide plate 23 Photoelectric Rotary Encoder 90 Display 143 Support plate 30 Swing arm 100 Cover 150 Transition connection plate 40 Adjustable extension rod 110 Cover 160 Torque speed sensor 50 Tension sensor 120 Brakes 170 Torque evaluation unit 60 Electric cylinder 130 Walking components 180

[0023] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0024] In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0027] See also Figures 1 to 3The embodiment of the present invention provides a device for accurately testing the static braking torque of a brake, comprising a frame 10, a workbench 20 arranged at the upper end of the frame 10, a support plate 30 arranged on the workbench 20, a transition connection plate 40 arranged on the support plate 30, a torque speed sensor 50 arranged on one side of the transition connection plate 40, a torque evaluation unit 60 arranged on the lower side of the torque speed sensor 50, a coupling 70 connected to the torque speed sensor 50, a main shaft 80 connected to the coupling 70, a photoelectric rotary encoder 90 arranged at the end of the main shaft 80, and a torque evaluation unit 60 arranged at the lower side of the torque speed sensor 50. The swing arm 100 is connected to the main shaft, the adjustable extension rod 110 is rotatably connected to the lower end of the swing arm 100, the tension sensor 120 is arranged at one end of the adjustable extension rod 110, the electric cylinder 130 is connected to the tension sensor 120, and the control component 140, one end of the main shaft 80 is connected to the torque speed sensor 50 through the coupling 70, and the other end is connected to the photoelectric rotary encoder 90, the tension sensor 120 is installed at the front end of the electric cylinder 130 and is connected to the adjustable extension rod 110 through a connecting shaft, and the other end of the adjustable extension rod 110 is connected to the swing arm 100.

[0028] Among them, the frame 10 serves as the basic supporting structure of the entire device, providing a stable bearing platform for the components above. The workbench 20 is arranged at the upper end of the frame 10, on which a support plate 30 is placed, and the support plate 30 further carries the subsequent key test components. The transition connection plate 40 is located on the support plate 30, which plays the role of connection and transition, and is convenient for the subsequent components to be installed in coordination with it. The torque and speed sensor 50 is installed on one side of the transition connection plate 30, which is used to accurately measure the torque and speed information of the relevant components. The lower side thereof is provided with a torque evaluation unit 60, which can analyze and evaluate the measured torque data. The coupling 70 is connected to the torque and speed sensor 50, and the main shaft 80 is connected to it through the coupling 70. The other end of the main shaft 80 is connected to the photoelectric rotary encoder 90, and the photoelectric rotary encoder 90 can accurately monitor the rotation of the main shaft 80. The swing arm 100 is connected to the main shaft 80, and its lower end is connected to the adjustable extension rod 110 by a rotational connection. A tension sensor 120 is provided at one end of the adjustable extension rod 110, and the tension sensor 120 is connected to the electric cylinder 130. The electric cylinder 130 can provide tension and accurately measure the tension value through the tension sensor 120, and the precise test of the static braking torque of the brake is achieved through the synergy between the various components. In addition, the device is also equipped with a control component 140 for controlling the entire test process and performing data display and other operations.

[0029] The above-mentioned device for accurately testing the static braking torque of the brake, by setting an adjustable extension rod 110, a torque speed sensor 50, and a photoelectric rotary encoder 90, effectively solves the problems existing in the existing static braking torque test of the brake, such as inaccurate force application, poor adaptability of the electric cylinder stroke, and insufficient experimental accuracy due to lack of data comparison. It provides a strong guarantee for accurately testing the static braking torque of the brake, helps to improve the performance detection level of the brake, and provides accurate data support for product quality control and R&D decisions in related industries.

[0030] In one embodiment of the present invention, the control component 140 includes an electrical control box 141, a control button 142 and a display screen 143 connected to the electrical control box 141. The electrical control box 141 may be a PLC controller for controlling the operation of various electrical devices in the device. The display screen 143 is used to display the control status.

[0031] In one embodiment of the present invention, an outer cover 150 is further provided at the upper end of the support plate 30, and a cover plate 160 is provided at the upper end of the outer cover 150. The torque and speed sensor 50, the torque evaluation unit 60, the spindle 80 and the photoelectric rotary encoder 90 are all arranged in the outer cover 150.

[0032] In one embodiment of the present invention, a first platform 21 and a second platform 22 are provided at the upper end of the frame 10, and the support plate 30 is provided on the first platform 21. A guide plate 23 is provided on the upper side of each of the first platforms 21. The first platform 21 is used to install two guide plates 23, which are symmetrical on the left and right. A support plate 30 is installed at the center position, and the brake 170 is connected to the support plate 30 through a transition connection plate 40. The second platform 22, the main shaft 80 is fixed to the workbench 20 through a bearing installation mechanism, and the bearing installation mechanism includes two support seats 81. Two bearing seats 82 are installed on the two support seats 81. A main shaft 80 is installed in the middle. The center of the main shaft 80 is vertically installed with a swing arm 100 to the ground, and is installed through the desktop opening of the second platform 22. One end of the main shaft 80 is connected to the torque and speed sensor 50 through a coupling 70. A torque evaluation unit 60 is installed below the torque and speed sensor 50 and connected to the brake 170 through the coupling 70. A photoelectric rotary encoder 90 is installed at the other end of the main shaft 80. Finally, the outer cover 150 is installed, and a cover plate 160 is installed on the top of the outer cover 150.

[0033] In one embodiment of the present invention, a travel assembly 180 is provided at the lower end of the frame 10. Specifically, in the embodiment of the present invention, the travel assembly 18 is four Forma wheels.

[0034] In one embodiment of the present invention, the electric cylinder 130 is installed on the frame 10 via a push rod base 131 .

[0035] In the preparation process of the test, the equipment integrity check should be carried out first. Carefully confirm whether all parts of the equipment are complete and not damaged or missing. At the same time, focus on checking the firmness of the connection between the various parts, including the connection between the brake 170 and the transition connection plate 40, the support plate 30, and the installation of the electric cylinder 130 and the push rod base 131, the tension sensor 120, the adjustable extension rod 110 and the swing arm 100. If the stroke of the electric cylinder 130 is short, the adjustable extension rod 110 does not need to be installed. If the stroke of the electric cylinder 130 is long, the adjustable extension rod 110 should be installed first, and then the electric cylinder 130 should be installed horizontally on the rack 10 to ensure that the equipment will not cause errors in subsequent tests. Then, open the electrical box door of the electrical control box 141, connect the equipment to the power supply, and ensure that the power-on is stable and the grounding is good.

[0036] After the inspection, the test installation is carried out. This part mainly involves installing the brake under test on the support plate 30. The brake under test 170 is firmly installed at the center of the support plate 30 through the transition connection plate 40. Then, the pre-test settings are carried out to confirm that the torque speed sensor 50, the torque evaluation unit 60, the photoelectric rotary encoder 90 and the tension sensor 120 are working properly and there is no fault display, and to check whether the connection lines of each sensor are correctly connected. The parameters required for the test are set through the control button 142 and the display screen 143, such as the torque range, speed, loading speed, etc. of the test, and the test can be started after accurate settings are made according to the specific test requirements.

[0037] After starting the equipment, the electric cylinder 130 is fixed on the frame 10 through the push rod base 131 and starts working, and applies force to the swing arm 100 through the tension sensor 120 and the adjustable extension rod 110. During the test, the torque and speed sensor 50 collects the torque and speed data of the brake in real time, and transmits it to the torque evaluation unit 60 for analysis and processing; the photoelectric rotary encoder 90 records the rotation angle and speed of the brake and other information; the tension sensor 120 measures the tension applied by the electric cylinder 130 for subsequent data comparison. Here, the tester needs to closely observe the various data displayed on the display screen 143, and pay attention to the operating status of the equipment, such as whether there is abnormal noise, vibration or overheating, so as to find problems in time and take corresponding measures.

[0038] After the test is completed, press the stop button, the equipment stops running, the electric cylinder 130 stops applying force, and the brake 170 also stops working. Next, read and record the test result data displayed on the display screen 143, including the static braking torque, rotation speed, rotation angle and other information of the brake. At the same time, use the data of the tension sensor 120 for comparative analysis to further confirm the accuracy of the test results. Then, further analyze and process the collected data to generate a test report. Finally, remove the brake 170 under test, clean the support plate 30 and the transition connection plate 40, check whether the various parts of the equipment are worn or damaged, and repair or replace them in time if necessary, close the electrical box door of the electrical control box 141, and tidy up the working environment around the equipment to prepare for the next use.

[0039] Specifically, in the embodiment of the present invention, the static braking torque, the conversion calculation of torque and shear stress, and the conversion calculation of tension and torque are as follows:

[0040] Calculation of static braking torque

[0041] The static braking torque can be calculated by the torque data collected by the torque speed sensor (6). If the torque is known to be T (unit: N·m) and the lever arm length is L (unit: m), then the static braking torque M = T×L.

[0042] M=T×L (1)

[0043] Conversion calculation of moment and shear stress

[0044] If the torque is known to be T (unit: N·m), the distance from any point on the circular section to the center of the circle is ρ (unit:) meter. For a solid circular section, its diameter is D (unit: meter), and the polar moment of inertia of the solid circular section.

[0045]

[0046] The shear stress at any point on the circular cross section is.

[0047]

[0048] The maximum shear stress calculation formula for a solid circular section is:

[0049] If the torque is known to be T (unit: N·m) and the diameter of the solid circular section is D (unit: m), then the distance from the edge of the solid circular section to the center is Torsional section modulus.

[0050]

[0051] Maximum shear stress in a solid circular section.

[0052]

[0053] In a solid circular section, the shear stress is the largest at the edge. Substituting the distance at the edge into the shear stress formula at any point can obtain the maximum shear stress formula. The torsional section coefficient reflects the ability of the solid circular section to resist torsional deformation.

[0054] The calculation formula of the polar moment of inertia of a hollow circular section is:

[0055] If the outer diameter of the hollow circular section is known to be D (unit: meter) and the inner diameter is d (unit: meter), then the polar moment of inertia of the hollow circular section is.

[0056]

[0057] This formula is obtained by calculating the moment of inertia of the hollow circular section relative to the center of the circle, taking into account the influence of the hollow part on the moment of inertia.

[0058] The calculation formula of the maximum shear stress of hollow circular section is:

[0059] If the torque is known to be T max (unit: N·m), the outer diameter of the hollow circular section is D (unit: m), and the inner diameter is d (unit: m), then the distance from the outer edge of the hollow circular section to the center is Polar moment of inertia of hollow circular section,

[0060]

[0061] Torsional section modulus,

[0062]

[0063] in Maximum shear stress in hollow circular section.

[0064]

[0065] In a hollow circular section, the shear stress is the largest at the outer edge. The maximum shear stress formula is obtained by substituting the polar moment of inertia formula of the hollow circular section. The torsional section coefficient reflects the degree of hollowness of the hollow circular section. When d is close to D, the degree of hollowness is larger, the torsional section coefficient decreases, and the maximum shear stress will increase.

[0066] Conversion calculation of tension and torque

[0067] The tension F (unit: Newton) applied by the electric cylinder (20) is measured by the tension sensor (19). The distance from the connection point of the adjustable extension rod (15) and the swing arm (14) to the rotation center of the brake is d (unit: meter). At this time, the torque M generated by the tension 拉 =F×d.

[0068] M拉 =F×d (10)

[0069] Calculation of rotation speed and rotation angle (if necessary)

[0070] The photoelectric rotary encoder (10) records the rotation angle θ (unit: radian) and the rotation speed ω (unit: radian / second) of the brake. If the angle of rotation in time t (unit: second) is known to be θ, then the average rotation speed is

[0071]

[0072] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A device for accurately testing the static braking torque of a brake, comprising a frame and a workbench disposed on the upper end of the frame, characterized in that: It also includes a support plate arranged on the workbench, a transition connection plate arranged on the support plate, a torque and speed sensor arranged on one side of the transition connection plate, a torsion evaluation unit arranged on the lower side of the torque and speed sensor, a coupling connected to the torque and speed sensor, a main shaft connected to the coupling, a photoelectric rotary encoder arranged at the end of the main shaft, a swing arm connected to the main shaft, an adjustable extension rod rotatably connected to the lower end of the swing arm, a tension sensor arranged at one end of the adjustable extension rod, an electric cylinder connected to the tension sensor, and a control component, wherein one end of the main shaft is connected to the torque and speed sensor through the coupling, and the other end is connected to the photoelectric rotary encoder, the tension sensor is installed at the front end of the electric cylinder and is connected to the adjustable extension rod through a connecting shaft, and the other end of the adjustable extension rod is connected to the swing arm.

2. A device for accurately testing the static braking torque of a brake according to claim 1, characterized in that: The control assembly includes an electrical control box and control buttons and a display screen connected to the electrical control box.

3. The device for accurately testing the static braking torque of a brake according to claim 1, characterized in that: An outer cover is also provided at the upper end of the support plate, and a cover plate is provided at the upper end of the outer cover. The torque and speed sensor, the torque evaluation unit, the main shaft and the photoelectric rotary encoder are all arranged in the outer cover.

4. The device for accurately testing the static braking torque of a brake according to claim 1, characterized in that: A first platform and a second platform are provided at the upper end of the frame, and the support plate is provided on the first platform.

5. The device for accurately testing the static braking torque of a brake according to claim 4, characterized in that: A mounting guide plate is respectively provided on the upper side of the first platform.

6. The device for accurately testing the static braking torque of a brake according to claim 1, characterized in that: A walking assembly is arranged at the lower end of the frame.

7. A device for accurately testing the static braking torque of a brake according to claim 6, characterized in that: The traveling components are a plurality of Forma wheels.

8. The device for accurately testing the static braking torque of a brake according to claim 1, characterized in that: The main shaft is fixed on the workbench through a bearing mounting mechanism.

9. The device for accurately testing the static braking torque of a brake according to claim 8, characterized in that: The bearing installation mechanism comprises two support seats arranged at intervals and two bearing seats arranged on the two support seats.

10. The device for accurately testing the static braking torque of a brake according to claim 1, characterized in that: The electric cylinder is installed on the frame through a push rod base.

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