A testing device for gearbox strength testing

Abstract

This utility model discloses a testing device for gearbox strength testing, relating to the field of gear testing. It includes a base on which a gearbox to be tested and a powertrain for driving the gearbox input shaft are fixedly connected. A vibration device for detecting gearbox vibration is fixedly connected to the base. A testing device is also fixedly connected to the base for detecting the gearbox's temperature, decibel level, and vibration. The advantages are: by setting a vibration device on the base, the vibration conditions of the gearbox after installation, such as the bumps of construction machinery or the vibration of a vehicle, can be simulated. Combined with the powertrain driving the gearbox, this achieves composite testing of dynamic drive and vibration environment, effectively exposing potential structural problems of the gearbox under vibration conditions, such as bearing loosening and gearbox resonance. The test results are more consistent with actual usage scenarios, providing a reliable basis for strength assessment.

Description

Technical Field

[0001] This utility model relates to the field of gear testing technology, specifically to a testing device for testing the strength of gearboxes. Background Technology

[0002] As a core component of a mechanical transmission system, the strength and stability of the gearbox directly determine the operational safety of the entire machine. Therefore, it must undergo comprehensive performance testing using specialized testing equipment before leaving the factory. Existing gearbox strength testing equipment has the following technical shortcomings:

[0003] Most equipment can only perform static loading or conventional dynamic drive testing of gearboxes, and cannot simulate the vibration environment that accompanies the actual installation of gearboxes. This results in a large deviation between the test results and the actual usage scenario, making it difficult to detect potential structural hazards under vibration conditions, such as loose bearings and gearbox resonance.

[0004] The detection parameters are not comprehensive. Traditional equipment often only focuses on core parameters such as output torque, and lacks synchronous and accurate detection of auxiliary parameters such as temperature during gearbox operation, abnormal noise caused by tooth surface wear and shaft jamming. It is easy to miss intensity problems reflected by excessive temperature and abnormal noise. Utility Model Content

[0005] The purpose of this invention is to provide a testing device for gearbox strength testing in order to solve the above-mentioned problems, as detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This utility model provides a testing device for testing the strength of a gearbox, including a base, on which a gearbox to be tested and a power assembly for driving the input shaft of the gearbox are fixedly connected;

[0008] A vibration device for dissipating the vibration of the gearbox is fixedly connected to the base.

[0009] A detection device is fixedly connected to the base for detecting the temperature, decibel level, and vibration of the gearbox.

[0010] A torque sensor is fixedly connected to the base for detecting the output torque of the gearbox. The input end of the torque sensor is fixedly connected to the output shaft of the gearbox.

[0011] The aforementioned test equipment for gearbox strength testing uses a powertrain to drive the gearbox, a torque sensor to detect the gearbox's output, a testing device to detect the gearbox's operating temperature, noise, and vibration level, and a vibration device to vibrate the gearbox to simulate the gearbox's working conditions after installation, thereby further testing the gearbox's stability.

[0012] Preferably, the detection device includes a fixed plate fixedly connected to the base, a lead screw threadedly connected to the fixed plate, a torque sensor rotatably connected to the end of the lead screw, and the torque sensor in contact with the surface of the gearbox.

[0013] Preferably, a decibel sensor and an infrared temperature sensor corresponding to the gearbox are fixedly connected to the fixing plate.

[0014] Preferably, the powertrain includes a motor fixedly connected to the base, the output shaft of the motor being fixedly connected to a rotating shaft, the end of the rotating shaft being fixedly connected to a mounting sleeve, and a connecting sleeve being inserted into the mounting sleeve, and the input shaft of the gearbox being inserted into the connecting sleeve.

[0015] Preferably, the mounting sleeve has a screw threaded onto its surface for fixing the connecting sleeve inside the mounting sleeve, and the end of the screw is inserted into a retaining hole on the surface of the connecting sleeve.

[0016] Preferably, the motor is coaxial with the rotating shaft, mounting sleeve, connecting sleeve, and input shaft of the gearbox.

[0017] Preferably, the input shaft of the gearbox is provided with a keyway, and a protrusion for clearance fitting with the inner wall of the keyway is fixedly connected inside the connecting sleeve.

[0018] Preferably, two noise-reducing covers are fixedly connected to the base, which are used to cover the motor and the gearbox respectively.

[0019] Preferably, the top of the soundproof enclosure is provided with a removable cover.

[0020] Preferably, the base has a through cavity.

[0021] The beneficial effects are:

[0022] 1. By setting a vibration device on the base, the vibration conditions of the gearbox after installation can be simulated, such as the bumps of construction machinery and the vibration of vehicles. Combined with the powertrain driving the gearbox, the combined working condition detection of dynamic drive and vibration environment can be realized. It can effectively expose the potential structural problems of the gearbox under vibration environment, such as bearing loosening and gearbox resonance. The test results are more consistent with the actual use scenario and provide a reliable basis for strength assessment.

[0023] 2. The detection device integrates a vibration detection screw adjustment torque sensor that contacts the gearbox surface to accurately collect vibration data, infrared temperature detection to monitor the bearing housing and gearbox temperature in real time and warn of overheating risks, and decibel detection to capture abnormal noise and reflect problems such as tooth surface wear and shaft jamming. Combined with the torque sensor at the output shaft end, it can realize the synchronous acquisition of multiple parameters such as torque, vibration, temperature and noise, comprehensively cover key indicators related to gearbox strength, and avoid the omission of hidden dangers caused by single parameter detection.

[0024] 3. Two noise-reducing covers are installed on the base to cover the motor and gearbox respectively, which can effectively isolate the motor running noise and external environmental noise, and avoid interfering with the gearbox's own noise detection. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a three-dimensional structural diagram of the gearbox of this utility model;

[0027] Figure 2 This is a three-dimensional structural diagram of the base of this utility model;

[0028] Figure 3 This is a front view structural diagram of the present invention.

[0029] The annotations in the attached figures are explained as follows:

[0030] 1. Base; 2. Soundproof enclosure; 3. Powertrain; 4. Gearbox; 5. Motor; 6. Shaft; 7. Mounting sleeve; 8. Connecting sleeve; 9. Screw; 10. Vibration device; 11. Torque sensor; 12. Detection device; 13. Keyway; 14. Fixing plate; 15. Lead screw; 16. Decibels sensor; 17. Infrared temperature sensor; 18. Vibration sensor. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] See Figures 1-3 As shown, this utility model provides a testing device for testing the strength of a gearbox, including a base 1, on which a gearbox 4 to be tested and a power assembly 3 for driving the input shaft of the gearbox 4 are fixedly connected;

[0033] A vibration device 10 for vibrating the gearbox 4 is fixedly connected to the base 1;

[0034] The vibration device 10 adopts existing technology and is fixed to the base 1. It is used to simulate the vibration conditions of gearbox assembly. The core is that the model of the vibration motor matches the weight, size and expected vibration intensity of the gearbox. The frequency can be continuously adjusted within the commonly used range. The vibration motor is installed through the shock-absorbing rubber pad, which ensures that the vibration is transmitted to the gearbox and reduces the impact on other components. The installation angle can be adjusted through the bracket bolt holes to adapt to vibration requirements in different directions. It is equipped with a vibration controller, which can accurately set parameters and digitally display the working status.

[0035] A detection device 12 is fixedly connected to the base 1 to detect the temperature, decibels and vibration of the gearbox 4.

[0036] A torque sensor 11 is fixedly connected to the base 1 to detect the output torque of the gearbox 4. The input end of the torque sensor 11 is fixedly connected to the output shaft of the gearbox 4.

[0037] The torque sensor 11 is fixed to the base 1, and its input end is rigidly connected to the output shaft of the gearbox 4 via a coupling such as a diaphragm coupling. The housing is made of stainless steel, providing strong protection and anti-interference capabilities. The internal strain gauge is made of a special alloy material, exhibiting high sensitivity and low temperature drift, enabling accurate torque measurement at different temperatures. It outputs standard analog or digital signals for easy subsequent data processing. During installation, it is essential to ensure coaxiality with the gearbox output shaft to minimize measurement errors.

[0038] The powertrain 3 provides driving force to the input shaft of the gearbox 4. The core of the powertrain is a three-phase asynchronous motor 5, which matches the power of the gearbox under test and is fixed to the base 1 with anchor bolts. The output shaft of the motor is rigidly connected to the rotating shaft 6 via a coupling such as a plum blossom coupling. The rotating shaft 6 is made of 40Cr alloy steel with a quenched and tempered finish, and the end of the rotating shaft is fixedly connected to the mounting sleeve 7, which is made of medium carbon steel.

[0039] One end of the connecting sleeve 8 is inserted into the mounting sleeve 7 and fixed by a high-strength internal hex screw 9;

[0040] The other end is inserted into the gearbox input shaft, with its inner diameter transitioning to the input shaft, and its built-in protrusion engaging with the keyway 13 of the input shaft to achieve power transmission and circumferential positioning.

[0041] The motor, shaft, mounting sleeve, connecting sleeve, and gearbox input shaft must be coaxial to reduce vibration and wear.

[0042] As an optional implementation, the detection device 12 includes a fixing plate 14 fixedly connected to the base 1, a lead screw 15 threadedly connected to the fixing plate 14, a torque sensor 11 rotatably connected to the end of the lead screw 15, and the torque sensor 11 is in contact with the surface of the gearbox 4.

[0043] A decibel sensor 16 and an infrared temperature sensor 17 corresponding to the gearbox 4 are fixedly connected to the fixed plate 14.

[0044] The detection device 12 is used to simultaneously detect the gearbox temperature, decibel level, and vibration. The aluminum alloy mounting plate 14 is fixed to the base 1. The lead screw 15 is threadedly connected to the mounting plate, and its end is rotatably connected to the torque sensor 11, allowing adjustment of the sensor's contact position and pressure with the gearbox surface. The torque sensor 11 is a strain gauge type, with a range matching the gearbox output torque; the decibel sensor 16 is a high-precision sound level meter, covering commonly used detection ranges; and the infrared temperature sensor 17 is a non-contact type, aligned with key parts of the gearbox. All these are integrated into the detection device. The output signal is processed by the conditioning circuit, acquired by the data acquisition module, and transmitted to the host computer for analysis.

[0045] The powertrain 3 includes a motor 5 fixedly connected to the base 1. The output shaft of the motor 5 is fixedly connected to a rotating shaft 6. The end of the rotating shaft 6 is fixedly connected to a mounting sleeve 7, and a connecting sleeve 8 is inserted into the mounting sleeve 7. The input shaft of the gearbox 4 is inserted into the connecting sleeve 8.

[0046] The mounting sleeve 7 has a threaded connection with a screw 9 for fixing the connecting sleeve 8 inside the mounting sleeve 7. The end of the screw 9 is inserted into a retaining hole on the surface of the connecting sleeve 8.

[0047] The motor 5 is coaxial with the shaft 6, the mounting sleeve 7, the connecting sleeve 8, and the input shaft of the gearbox 4.

[0048] The input shaft of the gearbox 4 has a keyway 13, and the connecting sleeve 8 has a protrusion for clearance fit with the inner wall of the keyway 13.

[0049] Two soundproof covers 2 are fixedly connected to the base 1, which are used to cover the motor 5 and the gearbox 4 respectively.

[0050] The top of the soundproof enclosure 2 is equipped with a removable cover. Two soundproof enclosures 2 respectively enclose the motor 5 and gearbox 4. The outer layer is a thin steel plate for protection and support, while the inner layer is made of sound-absorbing material such as fiberglass sound-absorbing cotton. The sound absorption coefficient meets the standards, reducing equipment noise and minimizing external interference. The top is equipped with a removable cover with a handle, hinge, and rubber sealing strip for easy maintenance. Ventilation holes on the sides contain dust filters and sound-absorbing material, balancing heat dissipation and dust prevention, with the ventilation area matching the equipment's heat generation requirements.

[0051] The base 1 has a through cavity. The base 1 is made of high-strength steel, such as Q345, and is integrally formed, providing sufficient rigidity and stability to support the various components and operating forces of the equipment. The surface is milled for high flatness precision, providing a precise reference for component installation. The internal through cavity is used to centrally store cables, motor power cords, sensor signal lines, and small maintenance tools, preventing cable tangling and damage.

[0052] The equipment is equipped with a central control system such as a PLC controller to realize the coordinated operation of the powertrain, vibration device, and detection device: When the equipment is started, the central control system first detects the initial temperature of the gearbox 4 through the infrared temperature sensor 17, which needs to reach the range of room temperature ±5℃. Then, it instructs the motor 5 to start at a preset speed, such as gradually increasing from 500r / min to the rated speed. At the same time, the vibration device 10 applies vibration according to the application scenario of the gearbox to be tested, such as a 10-20Hz vibration frequency for gearboxes used in construction machinery and a 5-15Hz vibration frequency for gearboxes used in automobiles.

[0053] The detection device 12 collects data synchronously. If the torque sensor 11 detects that the output torque exceeds the set threshold, such as 120% of the rated torque, or the infrared temperature sensor 17 detects that the temperature exceeds 90°C, the central control system will immediately trigger an alarm and control the motor 5 to reduce speed and the vibration device 10 to stop, so as to avoid overload damage to the gearbox.

[0054] The data acquisition module of the detection device 12 communicates with the central control system in real time via industrial Ethernet, with a data transmission rate of ≥100Mbps, ensuring that the synchronization time deviation of torque, temperature, noise and vibration data is ≤10ms;

[0055] The system has a built-in data comparison algorithm that can compare real-time detection data with preset gearbox standard parameters, such as noise value ≤75dB and vibration acceleration ≤0.3g under the rated torque of a certain model of gearbox. When the data exceeds the standard range, the control system will pop up an abnormal prompt on the operation interface, such as a touch screen, and record the abnormal time point and abnormal parameter value for subsequent fault analysis.

[0056] Using the above structure, the powertrain 3 drives the gearbox 4, the torque sensor 11 detects the output of the gearbox 4, the detection device 12 detects the temperature, noise and vibration of the gearbox 4 during operation, and the vibration device 10 vibrates the gearbox 4 to simulate the working conditions of the gearbox 4 after installation, further detecting the stability of the gearbox 4.

[0057] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A test apparatus for gear box strength detection, characterised in that: Includes a base (1), on which a gearbox (4) to be tested and a power assembly (3) for driving the input shaft of the gearbox (4) are fixedly connected; A vibration device (10) for vibrating the gearbox (4) is fixedly connected to the base (1); A detection device (12) is fixedly connected to the base (1) for detecting the temperature, decibels and vibration of the gearbox (4); A torque sensor (11) is fixedly connected to the base (1) for detecting the output torque of the gearbox (4). The input end of the torque sensor (11) is fixedly connected to the output shaft of the gearbox (4).

2. A test apparatus for gear box strength detection as claimed in claim 1, wherein: The detection device (12) includes a fixed plate (14) fixedly connected to the base (1), a lead screw (15) is threadedly connected to the fixed plate (14), a torque sensor (11) is rotatably connected to the end of the lead screw (15), and the torque sensor (11) is in contact with the surface of the gearbox (4).

3. A test apparatus for gear box strength detection as claimed in claim 2, wherein: A decibel sensor (16) and an infrared temperature sensor (17) corresponding to the gearbox (4) are fixedly connected to the fixed plate (14).

4. The testing equipment for gearbox strength testing according to claim 1, characterized in that: The powertrain (3) includes a motor (5) fixedly connected to the base (1), the output shaft of the motor (5) is fixedly connected to a rotating shaft (6), the end of the rotating shaft (6) is fixedly connected to a mounting sleeve (7), and a connecting sleeve (8) is inserted into the mounting sleeve (7), and the input shaft of the gearbox (4) is inserted into the connecting sleeve (8).

5. The testing equipment for gearbox strength testing according to claim 4, characterized in that: The mounting sleeve (7) has a screw (9) threaded on its surface to fix the connecting sleeve (8) inside the mounting sleeve (7), and the end of the screw (9) is inserted into a retaining hole on the surface of the connecting sleeve (8).

6. The testing equipment for gearbox strength testing according to claim 5, characterized in that: The motor (5) is coaxial with the shaft (6), mounting sleeve (7), connecting sleeve (8) and input shaft of gearbox (4).

7. The testing equipment for gearbox strength testing according to claim 6, characterized in that: The input shaft of the gearbox (4) is provided with a keyway (13), and the connecting sleeve (8) is fixedly connected with a protrusion for clearance fit with the inner wall of the keyway (13).

8. The testing equipment for gearbox strength testing according to claim 7, characterized in that: Two soundproof covers (2) are fixedly connected to the base (1), which are used to cover the motor (5) and the gearbox (4) respectively.

9. The testing equipment for gearbox strength testing according to claim 8, characterized in that: The top of the soundproof enclosure (2) is provided with a removable cover plate.

10. The testing equipment for gearbox strength testing according to claim 8, characterized in that: The base (1) has a through cavity.

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