Temperature isolation detection platform for testing variable temperature precision of encoder
By designing a temperature isolation detection table for encoder, the accuracy test of the encoder at different temperatures is achieved using temperature control boxes and thermal insulation materials, the problem of inability to effectively consider the temperature influence in the existing technology is solved, and high-precision Temperature testing and error compensation.
Patent Information
- Application Number
- CN202420476915.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-12
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-03-12
AI Technical Summary
The existing encoder accuracy detection scheme fails to effectively consider the impact of temperature on encoder accuracy error, and cannot realize variable temperature testing of the encoder and accuracy measurement at multiple different temperatures.
A temperature isolation detection table is designed to isolate the encoder to be tested and the reference rotary table through a temperature control box, and avoid heat exchange through the rotating spindle and sealing ring of the insulation material, so as to achieve the accuracy test of the encoder at different temperatures. .
The accuracy test of the encoder at different temperatures is realized, forming a temperature-accuracy curve, helping users understand the errors at different temperatures and compensate, improving the reliability and accuracy of detection.
Smart Images
Figure CN222505465U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of encoder accuracy testing, and specifically provides a temperature isolation testing platform for encoder variable temperature accuracy testing. Background Art
[0002] As a key component of high-end CNC machine tools, automation, and intelligent sensing, the encoder's accuracy index directly affects the operation and positioning accuracy of the equipment. Usually, for high-precision encoders, the accuracy curve they provide is a 0-360° division error under a certain preset temperature state, but does not provide accuracy curves under other temperature conditions or accuracy changes with temperature changes.
[0003] At present, domestic and foreign encoder manufacturers all provide accuracy curves under specified constant temperature. They cannot provide data curves for encoder accuracy changes at temperatures other than this. However, the actual working environment of the encoder is usually not the specified temperature provided by the encoder manufacturer. Therefore, the accuracy curves under specified constant temperature provided by the encoder manufacturer are not reliable.
[0004] There are two existing precision detection schemes: one is to use a polyhedron as a detection benchmark to test the accuracy of the encoder, and the other is to use a turntable or other high-precision digital continuous measurement equipment as a detection benchmark to test the accuracy of the encoder. Both of the above precision detection schemes do not consider the impact of temperature on the encoder's accuracy error, and the detection benchmark and the test encoder are set in the same temperature environment. When the test encoder needs to be tested at a variable temperature, the ambient temperature of the detection benchmark and the test encoder will change, but the detection benchmark can only guarantee high accuracy under rated temperature conditions. When the actual operating temperature is different from the rated temperature, the accuracy of the detection benchmark will be affected by the temperature, resulting in its accuracy being insufficient as a benchmark for encoder accuracy detection. Therefore, it is impossible to implement variable temperature testing of the encoder, and it is impossible to measure the accuracy of the encoder at multiple different temperatures.
[0005] In addition, there is a solution to avoid the influence of temperature on the encoder accuracy test by temperature compensating the benchmark, but its accuracy range is limited and it is only applicable to some products. The correctness of its temperature compensation function cannot be verified, and it does not meet the benchmark usage requirements for the accuracy test of high-precision products. Utility Model Content
[0006] In order to solve the above problems, the utility model provides a temperature isolation test bench for variable temperature accuracy test of encoders, wherein the temperature of the encoder under test and the reference turntable are isolated by a temperature control box, and the heat exchange between the encoder under test and the reference turntable is avoided by a rotating spindle of a heat insulating material, and the accuracy test of the encoder under test at different temperatures is realized by the temperature control box.
[0007] The temperature isolation test bench for encoder temperature accuracy test provided by the utility model comprises: a rotating spindle, a reference turntable, a temperature control box, a fixing plate and a sealing ring;
[0008] Among them, a fixed plate is arranged in the temperature control box, which is used to support and fix the encoder under test, and a first axial hole is opened on the fixed plate; the temperature control box has heating and cooling functions, which is used to adjust the ambient temperature of the encoder under test during the accuracy test, and a second axial hole is opened on the bottom panel of the temperature control box; a sealing ring is connected to the inner edge of the second axial hole, and the inner diameter of the sealing ring is the same as the outer diameter of the rotating spindle; the encoder under test is arranged above the fixed plate, the rotating spindle is connected to the encoder under test, and the rotating spindle passes through the first axial hole and the second axial hole and is coaxially connected to the reference turntable; the rotating spindle adopts heat insulation material to isolate the encoder under test from heat exchange with the reference turntable through the rotating spindle.
[0009] Preferably, it also includes a support frame, which is used to support a temperature control box. The temperature control box is arranged on the upper surface of the support frame, and the reference turntable is arranged below the support frame.
[0010] Preferably, a heating plate and a refrigerator are provided inside the temperature control box to adjust the temperature inside the temperature control box.
[0011] Preferably, a constant temperature box is further provided, and the reference turntable is arranged in the constant temperature box, and the temperature in the constant temperature box is equal to the rated temperature of the reference turntable.
[0012] Preferably, the sealing ring comprises an inner sealing ring and an outer sealing ring, and an air layer is provided between the inner sealing ring and the outer sealing ring to reduce heat exchange between the temperature control box and the outside.
[0013] Compared with the prior art, the utility model can achieve the following beneficial effects:
[0014] The utility model isolates the temperature of the measured encoder and the reference turntable by a temperature control box, and avoids heat exchange between the measured encoder and the reference turntable by a rotating spindle and a sealing ring of a heat insulating material. The temperature control box can be used to test the accuracy performance of the encoder at different temperatures, and a temperature-accuracy curve is formed to help users understand the temperature performance of the encoder at different temperatures and the possible errors, so that users can compensate for the errors.
[0015] The utility model can be upgraded and built on the existing precision detection platform, without the need to purchase high-precision testing equipment, thus saving development costs, and has a compact structure, small footprint, easy disassembly, and efficient construction, and can be operated by technicians themselves. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 The present invention is a schematic diagram of the structure of a temperature isolation test bench for encoder temperature accuracy testing provided in accordance with an embodiment of the present invention.
[0017] Reference numerals include:
[0018] Encoder under test 1, rotating spindle 2, reference turntable 3, temperature control box 4, fixing plate 5, sealing ring 6, supporting frame 7. DETAILED DESCRIPTION
[0019] Hereinafter, embodiments of the present utility model will be described with reference to the accompanying drawings. In the following description, the same modules are represented by the same reference numerals. In the case of the same reference numerals, their names and functions are also the same. Therefore, the detailed description thereof will not be repeated.
[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and do not constitute a limitation of the utility model.
[0021] like Figure 1 As shown, the embodiment of the utility model provides a temperature isolation test bench for variable temperature accuracy test of encoders, which is used to detect the accuracy of the encoder 1 under different temperature conditions, and specifically includes: a rotating spindle 2, a reference turntable 3, a temperature control box 4, a fixing plate 5, a sealing ring 6 and a support frame 7, wherein the encoder 1 under test is arranged in the temperature control box 4. During the variable temperature accuracy test of the encoder, the temperature control box 4 needs to provide an independent environment that can change the temperature and maintain the temperature for the encoder 1 under test, and the encoder 1 under test needs to be isolated from the reference turntable 3 to avoid the temperature environment of the encoder 1 under test from affecting the reference turntable 3. A heating plate and a refrigerator are arranged in the temperature control box 4, and the heating or cooling function can be realized by the heating plate and the refrigerator. By heating or cooling the local environment in the temperature control box 4, the working environment temperature of the encoder 1 under test is changed to meet the test requirements of the encoder 1 under test at different temperatures. In addition, the temperature control box 4 also needs to have good thermal insulation effects. All panels of the temperature control box 4 are made of insulation materials. Specifically, polyurethane foam materials or polystyrene boards can be used to avoid heat exchange between the temperature control box 4 and the environment outside the box as much as possible.
[0022] As a preferred embodiment, a temperature sensor is also provided in the temperature control box 4, which is used to measure and display the ambient temperature in the temperature control box 4. In addition, when the ambient temperature is lower or higher than the temperature required for the test, the heating plate or refrigerator is automatically controlled to achieve heating or cooling adjustment to ensure that the temperature in the temperature control box 4 remains constant during the test.
[0023] The fixing plate 5 is arranged in the temperature control box 4 and at a lower position, and there is a certain distance between the fixing plate 5 and the bottom panel of the temperature control box 4. The fixing plate 5 is relatively fixed to the side panel surface of the temperature control box 4, and its height is adjustable. A first axial hole is opened in the central position of the fixing plate 5, and the first axial hole is used to accommodate the rotating spindle 2. During the precision detection process, the fixing plate 5 is used to support and fix the encoder 1 to be tested, and the encoder 1 to be tested is placed on the upper surface of the fixing plate 5. A second axial hole is also opened on the bottom panel of the temperature control box 4, and the size of the second axial hole is slightly larger than the diameter of the rotating spindle 2.
[0024] During the precision detection process, the temperature control box 4 is set on the support frame 7, and the reference turntable 3 is set below the support frame 7. The reference turntable 3 is coaxially connected to the encoder 1 under test through the rotating spindle 2, and the encoder 1 under test rotates synchronously with the reference turntable 3. The rotation angle of the reference turntable 3 is the reference quantity, and the reading of the encoder 1 under test is the measurement quantity. By calculating the unit angle difference between the measurement quantity and the reference quantity, the precision error of the encoder 1 under test at the set temperature of the temperature control box 4 can be obtained. Since the rotation accuracy of the reference turntable 3 is also affected by temperature, the accuracy of the rotation angle of the reference turntable 3 is reliable only at its rated temperature. Therefore, during the test process, the ambient temperature of the reference turntable 3 when working needs to be guaranteed to be the rated temperature. The rated temperature of the reference turntable 3 is usually around 20°C, which is close to room temperature, so usually the reference turntable 3 only needs to work at room temperature, and its accuracy is less affected. However, the encoder 1 under test is affected by the working environment and mechanical heating, and usually works between -40℃ and 100℃. At present, the encoder manufacturer usually only provides the working accuracy of the encoder 1 under a certain temperature, but this temperature is usually quite different from the actual working temperature, so it is necessary to measure the encoder accuracy under the actual working temperature. In order to meet the needs of different working environments, it is also necessary to expand the measurement of the accuracy performance of the encoder 1 under test at multiple different temperatures and form a temperature-accuracy curve to understand the temperature performance of the encoder at different temperatures and the possible errors. However, when the working temperature during the detection deviates greatly from the room temperature, the accuracy of the reference turntable 3 will be affected by the temperature. For example, if the actual working temperature of the encoder 1 under test is -25℃ or 80℃, the rotation angle of the reference turntable 3 will have a large deviation, resulting in the final measured temperature-accuracy curve containing both the error of the encoder 1 under test and the error caused by the temperature of the reference turntable 3. In the existing encoder accuracy test process, the encoder 1 under test and the reference turntable 3 are both in the same temperature environment. On the one hand, it is difficult to adjust the working temperature of the encoder 1 under test, and on the other hand, the reference turntable 3 will produce errors when working at non-rated temperatures.
[0025] Therefore, the embodiment of the utility model is designed with a temperature control box 4, which can realize the regulation of the working temperature of the encoder 1 under test, and also isolate the working environment of the encoder 1 under test from the reference turntable 3, to ensure that the working environment of the reference turntable 3 is always maintained at the rated temperature during the temperature change process of the encoder 1 under test.
[0026] Since the encoder 1 under test and the reference turntable 3 are synchronously rotated by the rotating spindle 2, the conventional metal rotating spindle 2 will cause the encoder 1 under test and the reference turntable 3 to achieve heat exchange through the rotating spindle 2, so the rotating spindle 2 in the embodiment of the utility model adopts a heat-insulating material, specifically alumina ceramics or silicon carbide ceramics, to reduce the heat exchange between the temperature control box 4 and the reference turntable 3, which not only ensures the constant temperature of the encoder 1 under test, but also ensures the accuracy maintenance ability of the reference turntable 3 at the rated temperature. In addition, alumina ceramics or silicon carbide ceramics also have high rigidity, which meets the mechanical requirements of the rotating spindle 2.
[0027] In addition, since the second axial hole is opened on the bottom panel of the temperature control box 4, the temperature control box 4 will exchange heat with the external environment, affecting the temperature of the environment where the reference turntable 3 is located. Therefore, a sealing ring 6 is also connected to the inner edge of the second axial hole. The sealing ring 6 is made of a flexible heat preservation or heat insulation material, such as artificial rubber, polyurethane, polystyrene, etc. The inner diameter of the sealing ring 6 is the same as the outer diameter of the rotating spindle 2.
[0028] As a preferred embodiment, the second axial hole of the temperature control box 4 adopts double-layer sealing, and the sealing ring 6 includes an inner sealing ring and an outer sealing ring, wherein there is a certain distance between the inner sealing ring and the outer sealing ring, and an air layer is formed in the middle to reduce heat exchange between the temperature control box 4 and the external environment.
[0029] As a preferred embodiment, in order to further improve the test accuracy, a constant temperature box is provided, and the reference turntable 3 is placed in the constant temperature box. The temperature in the constant temperature box is adjusted to be equal to the rated temperature of the reference turntable 3 to ensure that the reference turntable 3 always works at the rated temperature.
[0030] The temperature isolation test bench for the variable temperature accuracy test of the encoder provided by the embodiment of the utility model can detect the accuracy performance of the encoder 1 under different temperatures. For the encoder manufacturer, multiple sets of temperature-accuracy curves can be provided when the encoder leaves the factory for user reference to improve the user recognition of the encoder. For the user, the actual accuracy error corresponding to the encoder can be measured according to the actual working environment temperature according to actual work needs, so as to facilitate error compensation. In addition, the utility model has a simple structure, is easy to disassemble, and is efficient to build. The technicians can operate it by themselves without the need for manufacturer guidance or on-site debugging.
[0031] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.
[0032] The above specific implementation methods of the utility model do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.
Claims
1. A temperature isolation test bench for encoder temperature accuracy test, characterized in that: include: Rotating spindle, reference turntable, temperature control box, fixed plate and sealing ring; Among them, the fixed plate is arranged in the temperature control box, which is used to support and fix the encoder under test, and the fixed plate is provided with a first axial hole; the temperature control box has heating and cooling functions, which is used to adjust the ambient temperature of the encoder under test during the accuracy test, and the bottom panel of the temperature control box is provided with a second axial hole; the inner edge of the second axial hole is connected with the sealing ring, and the inner diameter of the sealing ring is the same as the outer diameter of the rotating spindle; the encoder under test is arranged above the fixed plate, the rotating spindle is connected to the encoder under test, and the rotating spindle passes through the first axial hole and the second axial hole and is coaxially connected to the reference turntable; the rotating spindle adopts heat insulation material to isolate the encoder under test from heat exchange with the reference turntable through the rotating spindle.
2. The temperature isolation test bench for encoder variable temperature accuracy test according to claim 1, characterized in that: It also includes a support frame, which is used to support the temperature control box. The temperature control box is arranged on the upper surface of the support frame, and the reference turntable is arranged below the support frame.
3. The temperature isolation test bench for encoder temperature accuracy test according to claim 1, characterized in that: The temperature control box is provided with a heating plate and a refrigerator inside to adjust the temperature inside the temperature control box.
4. The temperature isolation test bench for encoder temperature accuracy test according to claim 1, characterized in that: A constant temperature box is also provided, and the reference turntable is arranged in the constant temperature box, and the temperature in the constant temperature box is equal to the rated temperature of the reference turntable.
5. The temperature isolation test bench for encoder temperature accuracy test according to claim 1, characterized in that: The sealing ring comprises an inner sealing ring and an outer sealing ring, and an air layer is arranged between the inner sealing ring and the outer sealing ring to reduce heat exchange between the temperature control box and the outside.