A gear detection system based on circular grating

Abstract

The present application discloses a gear detection system based on circular grating, wherein the torque motor is installed in the rear housing, the motor shaft is rotatably installed in the rear housing, the support sleeve is fixed to the outer periphery of the motor shaft, the rotor part is fixed to the outer periphery of the support sleeve and forms a match with the stator part; the grating mounting shaft is rotatably installed in the front housing, and the two ends of the double-headed spline shaft respectively form a spline match with the grating mounting shaft and the motor shaft and are clearance fit in the length direction; the gear detection system based on circular grating provided by the present invention, when the torque motor is normally started or runs at a large torque / high speed, most of the vibration will be absorbed and transmitted by the support sleeve, the motor shaft and the grating mounting shaft are connected by the double-headed spline shaft, and when the vibration is transmitted between the motor shaft and the grating mounting shaft, since the double-headed spline shaft has a clearance fit at both ends, it will block the transmission of part of the vibration and heat. This ensures that the operating state and stable state at the position of the grating mounting shaft are more stable, and the final test accuracy is also improved.

Description

Technical Field

[0001] The present invention relates to the field of gear detection structural equipment, and in particular to a gear detection system based on a circular grating. Background Art

[0002] The spindle drive system plays a crucial role in gear testing equipment. It encompasses not only the machine's working spindle and its transmission components, but also the torque measurement and gear measurement devices. Direct motor drive is commonly used in the market. This drive system primarily aims to ensure that the gear being tested achieves the desired speed, torque, and direction of rotation. To further ensure measurement accuracy, a measuring disc (encoder) is typically mounted at the front end of the spindle, close to the gear being tested.

[0003] The aforementioned integrated spindle design also presents some problems. The main drawback is that factors that may affect detection, such as motor vibration and heat energy, are directly transmitted to the gear being tested. This effect is particularly pronounced during high-torque tests, making it difficult to distinguish whether the vibration source is from the gear itself or the motor. This makes it difficult to effectively process the vibration using filtering technology, which in turn affects the accuracy of the test data. In addition, the maintenance cost of this structure is relatively high, which brings additional inconvenience and financial burden when maintaining, servicing, and replacing consumables such as bearings in the later stages. At the same time, traditional gear inspection equipment generally attaches the strain gauges used to measure torque to the front of the spindle. However, the spindle diameter that can transmit high torque is relatively large, which will result in very small strain and low measurement accuracy, and it is impossible to truly reflect the strain applied to the gear. Summary of the Invention

[0004] The main purpose of the present invention is to provide a gear detection system based on a circular grating, aiming to solve the problem that the vibration and heat of the motor are easily transmitted to the output end of the shaft and affect the work.

[0005] In order to achieve the above object, the present invention provides a gear detection system based on a circular grating, comprising:

[0006] rear box;

[0007] a torque motor installed in the rear housing, comprising a stator, a motor shaft, a support sleeve, and a rotor; the stator is circumferentially arranged on the inner wall of the rear housing, the motor shaft is rotatably mounted on the rear housing, the support sleeve is fixed to the outer circumference of the motor shaft, and the rotor is fixed to the outer circumference of the support sleeve to form a fit with the stator;

[0008] A front box body connected to the rear box body;

[0009] A grating mounting shaft is rotatably mounted on the front box body, and a circular grating module is connected to one end of the grating mounting shaft away from the motor shaft;

[0010] A double-ended spline shaft, with both ends forming a spline fit with the grating mounting shaft and the motor shaft respectively and a clearance fit in the length direction;

[0011] A strain gauge is installed on the peripheral wall of the double-ended spline shaft, and the strain gauge detects and sends a strain sensing signal.

[0012] Furthermore, one end of the grating mounting shaft away from the motor shaft is connected to a gear measurement module.

[0013] Furthermore, both ends of the double-headed spline shaft in the length direction respectively clamp an elastic ring with the motor shaft and the grating installation shaft in the length direction.

[0014] Furthermore, the spline fit formed between the double-ended spline shaft, the grating installation shaft and the motor shaft is a clearance fit in the circumferential direction.

[0015] Furthermore, a plurality of first spline teeth are provided on the outer wall of the double-headed spline shaft corresponding to one end of the motor shaft, a plurality of second spline teeth corresponding to the plurality of first spline teeth are provided on the inner wall of the motor shaft, and a buffer strip with an L-shaped cross section is provided between the first spline teeth and the second spline teeth, and the buffer strip is clamped in the thickness direction and height direction of the first spline teeth and the second spline teeth.

[0016] Furthermore, the front box body is slidably arranged on the rear box body along the length direction.

[0017] Furthermore, an annular groove is provided in the middle portion of the double-ended spline shaft in the length direction, and the strain gauge is provided at the position of the groove.

[0018] Furthermore, the support sleeve is made of a flexible material, and an expansion sleeve for expanding the support sleeve is provided corresponding to the inner circumference of the support sleeve.

[0019] Furthermore, the grating mounting shaft and the motor shaft are both cylindrical hollow structures.

[0020] Furthermore, a rotation speed measurement module and a torque measurement module are provided at the outer end of the motor shaft.

[0021] In the circular grating-based gear detection system provided by the present invention, when the torque motor starts normally or operates at high torque or high speed, most of the vibration generated is absorbed and transmitted by the support sleeve. The motor shaft and the grating mounting shaft are connected by a double-ended spline shaft. When vibration is transmitted between the motor shaft and the grating mounting shaft, the double-ended spline shaft has a clearance fit at both ends, which partially blocks the transmission of vibration and heat. This ensures a more stable operating state and stable state at the grating mounting shaft, ultimately improving test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 1 is a cross-sectional schematic diagram of a gear detection system based on a circular grating according to a first embodiment of the present invention;

[0023] Figure 2 is a cross-sectional schematic diagram of a gear detection system based on a circular grating according to a second embodiment of the present invention;

[0024] Figure 3 This is an exploded view of the assembly of a motor shaft, a grating mounting shaft, and a double-ended spline shaft in a gear detection system based on a circular grating according to a second embodiment of the present invention;

[0025] Figure 4 This is an exploded view (sectional view) of the assembly of a motor shaft, a grating mounting shaft, and a double-ended spline shaft in a gear detection system based on a circular grating according to a second embodiment of the present invention;

[0026] Figure 5 This is an assembly diagram (first viewing angle) of a motor shaft, a grating mounting shaft, and a double-ended spline shaft in a gear detection system based on a circular grating according to a third embodiment of the present invention;

[0027] Figure 6 yes Figure 5 Local magnification in;

[0028] Figure 7 This is an assembly diagram (second perspective) of the motor shaft, grating mounting shaft, and double-ended spline shaft in a gear detection system based on a circular grating according to the third embodiment of the present invention;

[0029] Figure 8 yes Figure 7 Local magnification in .

[0030] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0031] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] Those skilled in the art will appreciate that, unless expressly stated otherwise, the singular forms "a", "an", "said", "above", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the described features, integers, steps, operations, elements, units, modules, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components, and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, "connected" or "coupled" as used herein may include wireless connections or wireless couplings. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0033] Those skilled in the art will understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art in the art to which this invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless specifically defined as such, will not be interpreted in an idealized or overly formal sense.

[0034] Reference Figures 1 to 8 In one embodiment of the present invention, a gear detection system based on a circular grating includes:

[0035] rear box 100;

[0036] The torque motor 200 is installed in the rear housing 100. The torque motor 200 includes a stator portion 210, a motor shaft 220, a support sleeve 230, and a rotor portion 240. The stator portion 210 is circumferentially arranged on the inner wall of the rear housing 100. The motor shaft 220 is rotatably mounted on the rear housing 100. The support sleeve 230 is fixed to the outer periphery of the motor shaft 220. The rotor portion 240 is fixed to the outer periphery of the support sleeve 230 and cooperates with the stator portion 210.

[0037] The front box 300 is connected to the rear box 100;

[0038] The grating mounting shaft 400 is rotatably mounted on the front box body 300, and the end of the grating mounting shaft 400 away from the motor shaft 220 is connected to the circular grating module;

[0039] A double-ended spline shaft 500, with both ends forming a spline fit with the grating mounting shaft 400 and the motor shaft 220 and a clearance fit in the length direction;

[0040] The strain gauge 600 is mounted on the peripheral wall of the double-ended spline shaft 500 , and the strain gauge 600 detects and sends a strain sensing signal.

[0041] In the existing technology, the main flaw of the spindle design is that factors that may affect the detection, such as the vibration and heat energy of the motor, are directly transmitted to the gear being tested. This effect is particularly obvious when conducting high-torque tests, making it difficult to distinguish whether the vibration source comes from the gear itself or the motor in the measurement results.

[0042] The circular grating-based gear detection system provided by the present invention includes a rear box 100 serving as a main structural basis.

[0043] The torque motor 200 is installed in the rear housing 100 to provide power output. The torque motor 200 includes a stator part 210, a motor shaft 220, a support sleeve 230 and a rotor part 240. The stator part 210 is circumferentially arranged on the inner wall of the rear housing 100, and the motor shaft 220 is rotatably installed on the rear housing 100. The support sleeve 230 is fixed to the outer periphery of the motor shaft 220, and the rotor part 240 is fixed to the outer periphery of the support sleeve 230 to form a match with the stator part 210. The rotation of the motor shaft 220 is achieved by bearings at corresponding positions, and there is no specific limitation. The support sleeve 230 can provide a buffering effect, thereby providing a basis for blocking the transmission of vibration and heat. The motor shaft 220 can be supported on the rear housing 100 by high-precision angular contact bearings. The support sleeve 230 can adopt a hollow structure in the middle to effectively isolate the vibration caused by the rotor part 240.

[0044] The front box 300 is connected to the rear box 100. The front box 300 can be installed using screws or other methods, and the connection between the rear box 100 and the front box 300 can be end nuts or other methods. In some embodiments, the front box 300 can be slidably mounted on the rear box 100 through certain structural designs, providing a basis for operating status adjustment and maintenance.

[0045] The grating mounting shaft 400 is rotatably mounted on the front housing 300 . The rotation of the grating mounting shaft 400 is achieved by bearings at corresponding positions. A circular grating module is connected to one end of the grating mounting shaft 400 away from the motor shaft 220 .

[0046] In this embodiment, the introduction of a circular grating module enables precise monitoring of the rotation of the grating mounting shaft 400. A gear testing system based on a circular grating can aim for stable and accurate torque output. Therefore, the installation of a gear measurement module enables gear testing. The spindle head requires both torque and grating (angle) measurements, and the closer the measurement is to the gear being tested, the more accurate the data.

[0047] The double-ended spline shaft 500 forms a spline fit at both ends with the grating mounting shaft 400 and the motor shaft 220, respectively, and a clearance fit along its length. The spline fit at both ends of the double-ended spline shaft 500 transmits the rotation of the motor shaft 220 to the grating mounting shaft 400. The double-ended spline shaft 500 also forms a clearance fit at both ends with the grating mounting shaft 400 and the motor shaft 220, allowing for a certain amount of slippage along its length. This clearance fit can, to a certain extent, block the transmission of vibration and heat.

[0048] A strain gauge 600 is mounted on the circumferential wall of the double-ended spline shaft 500. It detects and transmits strain sensing signals. Power for the strain gauge 600 can be obtained from the double-ended spline shaft 500 itself or from an external source via wireless charging. Signal transmission from the strain gauge 600 is preferably wireless. The stability of the strain gauge 600 data can also be used to determine the rotational stability of the double-ended spline shaft 500. For example, if the test data from the strain gauge 600 exhibits significant fluctuations, this indicates a problem with the installation of the double-ended spline shaft 500.

[0049] During installation:

[0050] The first step is to install the rear box 100;

[0051] Install the stator part 210 on the rear housing 100. Specifically, a mounting plate can be provided corresponding to the stator part 210. After fixing the stator part 210 on the mounting plate, fix the mounting plate to the rear housing 100. After correcting the matching position of the stator part 210 and the rear housing 100, perform a leakage test to ensure that the stator part 210 does not leak. Install the front bearing and the front bearing end cover of the rear housing 100. Then combine the rotor part 240 with the support sleeve 230, and insert the motor shaft 220 into the support sleeve 230, and tighten it with the expansion sleeve 250 to form the rotor part 240 corresponding to the stator part 210. Install the rear bearing and the rear bearing end cover of the rear housing 100, and then tighten the relevant fixing screws in sequence to complete the installation of the rear housing 100 part.

[0052] Step 2: Double-ended spline shaft;

[0053] After the strain gauge 600 is mounted on the double-ended spline shaft 500 , the double-ended spline shaft 500 is matched with the motor shaft 220 .

[0054] Step 3: Install the front box 300;

[0055] The grating mounting shaft 400 is mounted on the front housing 300 via a rotary bearing.

[0056] Step 4: Integration;

[0057] Push the front box body 300 to one side of the double-headed spline shaft 500 to ensure that the transmission chain of the grating installation shaft 400 is normal, and finally install the front box body 300 with screws.

[0058] In summary, when the torque motor 200 starts normally or operates at high torque / high speed, most of the vibration generated will be absorbed and transmitted by the support sleeve 230. The motor shaft 220 and the grating installation shaft 400 are connected via the double-ended spline shaft 500. When vibration is transmitted between the motor shaft 220 and the grating installation shaft 400, the double-ended spline shaft 500 has a clearance fit at both ends, which will block some of the vibration and heat transmission. This ensures that the operating state and stable state at the position of the grating installation shaft 400 are more stable, and ultimately improves test accuracy.

[0059] In one embodiment, an end of the grating mounting shaft 400 away from the motor shaft 220 is connected to a gear measurement module.

[0060] In this embodiment, the spindle box requires torque and grating (angle) measurement, and the closer it is to the gear being tested, the more accurate the measurement data. Therefore, a circular grating module and a gear measurement module are connected to the end of the grating mounting shaft 400 away from the motor shaft 220. This arrangement of a double-ended spline shaft 500 isolates the drive and measurement components, providing stable output while ensuring measurement accuracy.

[0061] In one embodiment, a temperature sensor is installed at each end of the double-ended spline shaft 500. The data from these two temperature sensors can indicate whether the temperature characteristics of the entire spindle are normal. The above temperature test results reflect the temperature characteristics of the motor shaft 220 and the grating mounting shaft 400, further demonstrating the effectiveness of the double-ended spline shaft 500 in providing thermal insulation. The power supply and data transmission channels of the temperature sensors can both share the strain gauge 600.

[0062] Reference Figures 2 to 4 In one embodiment, both ends of the double-headed spline shaft 500 in the length direction respectively clamp an elastic ring 700 with the motor shaft 220 and the grating mounting shaft 400 in the length direction.

[0063] In this embodiment, the double-ended spline shaft 500 is clamped longitudinally by an elastic ring 700, thereby isolating longitudinal vibrations of the rear housing 100 and the torque motor 200 from the grating mounting shaft 400 to a certain extent. Taking the grating mounting shaft 400 as an example, a stepped structure is provided on the grating mounting shaft 400, and a corresponding stepped structure is also provided on the double-ended spline shaft 500, thereby providing a foundation for the installation of the elastic ring 700. The elastic ring 700 can be a butterfly spring or a combination of multiple ring structures.

[0064] Reference Figures 5 to 8 In one embodiment, the spline fit formed between the double-headed spline shaft 500 and the grating mounting shaft 400 and the motor shaft 220 is a clearance fit in the circumferential direction.

[0065] In this embodiment, the double-ended spline shaft 500 forms a precise clearance fit through its mating structure, making the transmission of the double-ended spline shaft 500 more stable. If the spline fit of the double-ended spline shaft 500 is too large, vibration or collision may occur, which may negatively affect the transmission. If no clearance is formed, it will not only be difficult to install, but also increase the transmission of vibration and heat.

[0066] Reference Figures 5 to 8 In one embodiment, a plurality of first spline teeth 510 are provided on the outer wall of the double-headed spline shaft 500 corresponding to one end of the motor shaft 220, and a plurality of second spline teeth corresponding to the plurality of first spline teeth 510 are provided on the inner wall of the motor shaft 220. A buffer strip 520 with an L-shaped cross section is provided between the first spline teeth 510 and the second spline teeth, and the buffer strip 520 is clamped in the thickness direction and height direction of the first spline teeth 510 and the second spline teeth.

[0067] In the process of having a small but accurate angle, the clearance fit of the above spline has certain defects. In this embodiment, the buffer strip 520 is used to form a stable connection between the double-ended spline shaft 500 and the motor shaft 220, while also avoiding the vibration and efficient heat transfer caused by the rigid connection. The multiple buffer strips 520 can be a split structure, and individually form a fit with each first spline tooth 510 and second spline tooth pair; the multiple buffer strips 520 can be connected to each other, for example, through a ring structure to form a connection in the circumferential direction.

[0068] In one embodiment, the front box body 300 is slidably disposed on the rear box body 100 along the length direction.

[0069] In this embodiment, the front housing 300 is configured to slide relative to the rear housing 100, simplifying maintenance of the double-ended splined shaft 500. Specifically, fixing bolts are provided on the end surfaces corresponding to the front housing 300 and rear housing 100. Once the fixing bolts are removed, the front housing 300 can slide. After the front housing 300 is separated, both the buffer strip 520 and the double-ended splined shaft 500 can be installed and maintained. The sliding configuration of the front housing 300 facilitates operation and eliminates the need for alignment.

[0070] In a specific embodiment, the outer diameter of the double-ended spline shaft 500 at one end close to the motor shaft 220 is larger than the outer diameter of the end away from the motor shaft 220 .

[0071] In this embodiment, the shape of the double-ended spline shaft 500 is restricted to provide a basis for the installation of multiple buffer strips 520 to form a ring structure.

[0072] Reference Figure 1 In one embodiment, an annular groove is provided in the middle of the double-headed spline shaft 500 in the longitudinal direction, and the strain gauge 600 is provided at the position of the groove.

[0073] In this embodiment, the central portion of the double-ended spline shaft 500 is recessed, forming a groove whose diameter is substantially the same as the diameter of the gear shaft being tested. During measurement, the strain gauge 600 is attached to this groove, and the strain experienced by the groove is interpreted as the strain experienced by the gear shaft, enabling accurate torque measurement. Furthermore, if the strain gauge 600 needs to be replaced, simply remove the front housing 300 to expose the double-ended spline shaft 500.

[0074] Reference Figure 1 In one embodiment, the support sleeve 230 is made of a flexible material, and a tightening sleeve 250 is provided on the inner periphery of the support sleeve 230 for expanding the support sleeve 230 outward.

[0075] In this embodiment, support sleeve 230 can be made of a polymer or a composite material composed of metal and polymer laminated (radially). The flexible material of support sleeve 230 blocks vibration and heat. The addition of expansion sleeve 250 shapes support sleeve 230, ensuring that support sleeve 230 not only maintains structural strength but also provides a cushioning effect.

[0076] In one embodiment, the grating mounting shaft 400 and the motor shaft 220 are both cylindrical hollow structures.

[0077] In this embodiment, the material usage of the cylindrical structured grating mounting shaft 400 and the motor shaft 220 can be reduced, and the difficulty of processing the coupling structure at the corresponding position with the double-headed spline shaft 500 is also reduced.

[0078] In one embodiment, a rotation speed measurement module and a torque measurement module are provided at the outer end of the motor shaft 220 .

[0079] In this embodiment, the speed measurement module and the torque measurement module can monitor the output state of the torque motor 200, including the speed and output torque. The specific structure type of the speed measurement module and the torque measurement module is not limited, and the testing function is the basis.

[0080] In summary, in the circular grating-based gear detection system provided by the present invention, when the torque motor 200 starts normally or operates at high torque / high speed, most of the vibration generated will be absorbed and transmitted by the support sleeve 230. The motor shaft 220 and the grating mounting shaft 400 are connected via a double-ended spline shaft 500. When vibration is transmitted between the motor shaft 220 and the grating mounting shaft 400, the double-ended spline shaft 500 has a clearance fit at both ends, which will block some of the vibration and heat transmission. This ensures that the operating state and stable state at the position of the grating mounting shaft 400 are more stable, and ultimately the test accuracy is also improved.

[0081] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A gear detection system based on circular grating, characterized in that: include: rear box; a torque motor installed in the rear housing, comprising a stator, a motor shaft, a support sleeve, and a rotor; the stator is circumferentially arranged on the inner wall of the rear housing, the motor shaft is rotatably mounted on the rear housing, the support sleeve is fixed to the outer circumference of the motor shaft, and the rotor is fixed to the outer circumference of the support sleeve to form a fit with the stator; A front box body connected to the rear box body; A grating mounting shaft is rotatably mounted on the front box body, and a circular grating module is connected to one end of the grating mounting shaft away from the motor shaft; A double-ended spline shaft, with both ends forming a spline fit with the grating mounting shaft and the motor shaft respectively and a clearance fit in the length direction; a strain gauge mounted on a peripheral wall of the double-ended spline shaft, the strain gauge detecting and sending a strain sensing signal; The spline fit formed between the double-ended spline shaft, the grating mounting shaft and the motor shaft is a clearance fit in the circumferential direction; A plurality of first spline teeth are provided on an outer wall of the double-ended spline shaft corresponding to one end of the motor shaft, a plurality of second spline teeth are provided on an inner wall of the motor shaft corresponding to the plurality of first spline teeth, and a buffer strip with an L-shaped cross section is provided between the first spline teeth and the second spline teeth, the buffer strip being clamped in the thickness direction and the height direction of the first spline teeth and the second spline teeth; The support sleeve is made of a flexible material, and a tightening sleeve is provided corresponding to the inner circumference of the support sleeve for expanding the support sleeve outward.

2. The gear detection system based on circular grating according to claim 1, characterized in that: One end of the grating mounting shaft away from the motor shaft is connected to a gear measurement module.

3. The gear detection system based on circular grating according to claim 1, characterized in that: Both ends of the double-headed spline shaft in the length direction respectively clamp an elastic ring with the motor shaft and the grating installation shaft in the length direction.

4. The gear detection system based on circular grating according to claim 1, characterized in that: The front box body is slidably arranged on the rear box body along the length direction.

5. The gear detection system based on circular grating according to any one of claims 1 to 4, characterized in that: An annular groove is provided in the middle portion of the double-ended spline shaft in the length direction, and the strain gauge is provided at the position of the groove.

6. The gear detection system based on circular grating according to any one of claims 1 to 4, characterized in that: The grating installation shaft and the motor shaft are both cylindrical hollow structures.

7. The gear detection system based on circular grating according to any one of claims 1 to 4, characterized in that: A rotation speed measurement module and a torque measurement module are provided at the outer end of the motor shaft.

Images