Rotary table and wireless test system
By introducing a magnetic scale and magnetic head to the rotary table, the precise detection of the rotation angle is achieved, and the problems of poor accuracy and low accuracy of the rotation angle detection of the rotary table in traditional technology are solved, and the detection accuracy is improved.
Patent Information
- Application Number
- CN202421906547.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-06
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-08-06
AI Technical Summary
In wireless tests, the rotation angle detection of traditional rotary tables has problems such as poor accuracy and low accuracy.
A rotary table including a base, a rotating body and a magnetic scale is designed. The magnetic signal on the first scale is read through the first magnetic head and the rotation information of the rotating body is calculated, thereby achieving accurate angle detection. Optionally, the second magnetic scale is used to further improve detection accuracy.
Through the correspondence between the magnetic scale and the magnetic head, the precise detection of the rotation angle is achieved, the accuracy of the rotation angle detection of the turntable is improved, and the problems of poor accuracy and low accuracy in traditional technology are solved.
Smart Images
Figure CN222993664U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of wireless testing, and particularly to a turntable and a wireless testing system. Background Art
[0002] Mechanical precision is the core of precision manufacturing, processing, and measurement. However, currently, in many application scenarios, it is actually very difficult to achieve a certain degree of mechanical precision. The following takes the problems of the turntable often encountered in the electromagnetic testing field as an example for explanation.
[0003] In wireless testing (such as in wireless testing systems such as spherical near-field, cylindrical near-field, planar near-field, anechoic chamber, etc.), precision moving components such as turntables and guide rails are often used. For example, when performing spherical near-field testing on an antenna, a turntable is usually used to carry the DUT and rotate it in the horizontal plane to perform tests at different azimuth angles. During continuous testing, the turntable rotates continuously, and the mechanical rotation of the turntable is synchronized with the electronic scanning of the test antenna to improve the testing speed. Specifically, it is necessary to obtain the real-time position (angle) signal of the turntable during continuous rotation to trigger the electronic scanning of the preset test angle.
[0004] Generally, the higher the frequency or the larger the DUT, the higher the requirement for mechanical motion precision. For example, when testing DUTs such as satellites and automobiles currently, the requirement for the mechanical precision of the turntable rotation and probe positioning may reach 0.01°. If it is a turntable with a diameter of 5m, the arc length corresponding to 0.01° at the edge of the turntable is 0.4363mm. Although the length of this arc is relatively large, it is still difficult to achieve precise rotational positioning in practice, and the following problems will be faced: It is very easy to detect whether the turntable can achieve an accuracy of 0.01 degrees (0.4363mm). However, if the turntable is very large or the load is very heavy, it is very difficult to move the turntable to an accuracy of 0.01 degrees. A slight drive may cause the turntable to overshoot the position, and it is necessary to repeatedly adjust at a position to accurately reach the preset angle; most turntables are driven by gears plus motors, and all gear drives will face backlash, which will cause positioning errors. For example, when the position parameters are read by the encoder of the driving motor of the turntable, the movement of the driving motor will be recognized by the motor encoder, but due to the gear backlash of the driven turntable, the actual movement arc length is not equal to the reading of the driving motor encoder, resulting in errors; during the long-term movement process, the contact area between the driving and driven gears of the turntable will wear, and the backlash between the driving and driven gears will increase after wear, leading to out-of-control precision.
[0005] In summary, the traditional method for detecting the rotation angle of the turntable has technical problems of poor accuracy and low precision. Summary of the Utility Model
[0006] The technical problem solved by the present utility model is how to improve the poor accuracy and low precision of the detection of the rotation angle of the turntable in the prior art.
[0007] The embodiments of the present utility model can be implemented as follows:
[0008] The present utility model provides a turntable, which is applied to a wireless test system and is used to carry a DUT and drive the DUT to rotate. The turntable includes:
[0009] A base;
[0010] A rotating body, rotatably connected to the base; the rotating body is used to carry the DUT and drive the DUT to rotate;
[0011] A first magnetic grating scale, including a first magnetic head and a first grating scale; the first grating scale is arranged on the rotating body, and the first grating scale extends in an arc shape along a first circular path, and the center of the first circular path coincides with the rotation center of the rotating body; the first magnetic head is arranged on the base, and the first magnetic head is arranged corresponding to the first circular path;
[0012] Wherein, the first magnetic head is used to read the magnetic signal on the first grating scale and convert the magnetic signal into an electrical signal for calculating the rotation information of the rotating body.
[0013] Optionally, the turntable further includes a second magnetic grating scale, the second magnetic grating scale includes a second magnetic head and a second grating scale; the second grating scale is arranged on the rotating body, and the second grating scale extends in an arc shape along a second circular path, and the center of the second circular path coincides with the center of the first circular path; the second magnetic head is arranged on the base, and the second magnetic head is arranged corresponding to the second circular path; the second magnetic head is used to read the magnetic signal on the first grating scale and convert the magnetic signal into an electrical signal for calculating the rotation information of the rotating body;
[0014] Wherein, during the rotation of the rotating body, the first magnetic head corresponds to the first grating scale, and / or, the second magnetic head corresponds to the second grating scale.
[0015] Optionally, a first connection line is formed by the connection line between the first magnetic head and the center of the first circular path, a second connection line is formed by the connection line between the projection of the second magnetic head on the plane where the first circular path is located and the center of the first circular path, and the first connection line and the second connection line coincide; the second grating scale corresponds to the notches formed by the two ends of the first grating scale on the first circular path.
[0016] Optionally, the two ends of the first grating scale coincide with the two ends of the second grating scale in the radial direction of the first circular path.
[0017] Optionally, the turntable further includes a triggering device, and both the first magnetic head and the second magnetic head are electrically connected to the triggering device;
[0018] When the first magnetic head and the second magnetic head are at a preset position corresponding to the overlapping portion of the first grating scale and the second grating scale, the triggering device emits an electrical signal for switching the start / stop states of the first magnetic head and the second magnetic head.
[0019] Optionally, the overlapping portion of the first grating scale and the second grating scale is divided into a first overlapping segment and a second overlapping segment;
[0020] The triggering device includes a first trigger switch and a second trigger switch. The first trigger switch corresponds to the first overlapping segment. When the first magnetic head and the second magnetic head are at a first preset position corresponding to the first overlapping segment, the first trigger switch emits an electrical signal for switching the start / stop states of the first magnetic head and the second magnetic head; the second trigger switch corresponds to the second overlapping segment. When the first magnetic head and the second magnetic head are at a second preset position corresponding to the second overlapping segment, the second trigger switch emits an electrical signal for switching the start / stop states of the first magnetic head and the second magnetic head.
[0021] Optionally, the radius of the first circumferential path is equal to the radius of the second circumferential path.
[0022] Optionally, the radian of the first grating scale is greater than the radian of the second grating scale.
[0023] Optionally, the turntable further includes a third trigger switch, and the third trigger switch is electrically connected to the second magnetic head. When the second magnetic head is at a third preset position on the second grating scale, the third trigger switch emits an electrical signal for triggering the start / stop of a test operation; or,
[0024] The third trigger switch is electrically connected to the first magnetic head. When the first magnetic head is at a fourth preset position on the first grating scale, the third trigger switch emits an electrical signal for triggering the start / stop of a test operation.
[0025] A wireless test system includes a test instrument and the above turntable. The turntable is connected to the test instrument, and the test instrument is used for sampling according to the electrical signal representing a preset rotation angle.
[0026] The beneficial effects of the turntable and the wireless test system provided by the present utility model compared with the prior art include:
[0027] During the process of the turntable performing the test operation, the rotating main body drives the component under test to rotate. At the same time, it drives the first grating scale to rotate, causing the first magnetic head to move relative to the first grating scale. At this time, the first magnetic head can read the magnetic signals at different positions on the first grating scale during the relative movement with respect to the first grating scale. By measuring the number of grids on the first grating scale passed by the first magnetic head, the corresponding angular information can be calculated, thereby achieving precise angular detection. This can improve the accuracy of detecting the rotation angle of the turntable and address the technical problems of poor accuracy and low precision in detecting the rotation angle of the turntable in the existing technology.
[0028] Furthermore, when the second grating scale is set and during the rotation of the rotating main body, in the case where the first magnetic head corresponds to the first grating scale and / or the second magnetic head corresponds to the second grating scale, during one 360° rotation of the rotating main body, at least one of the first magnetic head and the second magnetic head corresponds to the grating scale. Thus, the accuracy of detecting the rotation angle of the rotating main body can be ensured through any set of corresponding grating scale and magnetic head, improving the detection accuracy when the turntable has a rotation requirement of 360° or more. This can further address the technical problems of poor accuracy and low precision in detecting the rotation angle of the turntable in the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can be obtained based on these drawings.
[0030] Figure 1 Schematic diagram of the relative positions of the first magnetic grating scale and the second magnetic grating scale provided in the embodiments of the present application;
[0031] Figure 2 Schematic diagram of the relative positions of the first magnetic grating scale and the second magnetic grating scale provided in other embodiments of the present application;
[0032] Figure 3 Schematic diagram of the structure of the first grating scale provided in the embodiments of the present application.
[0033] Reference numerals: 1 - first grating scale; 2 - second grating scale; 3 - second magnetic head; 4 - first magnetic head; 5 - first overlapping section; 6 - second overlapping section; 7 - first trigger switch; 8 - second trigger switch. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. Components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.
[0035] Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings below is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.
[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0037] In the description of the present utility model, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is habitually placed during use, it is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.
[0038] In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.
[0039] It should be noted that the features in the embodiments of the present utility model can be combined with each other without conflict.
[0040] In the embodiments of the present application, a turntable is provided. The turntable can be applied to a wireless test system. When applied to the wireless test system, the turntable is used to carry a device under test and drive the device under test to rotate, so as to facilitate wireless performance testing of the device under test in different directions / angles. It should be noted that the turntable provided in this embodiment can improve the technical problems of poor accuracy and low precision in detecting the rotation angle of the turntable in the prior art.
[0041] In this embodiment, the turntable includes a base, a rotating body, and a first magnetic grating ruler. The rotating body is rotatably connected to the base; the rotating body is used to carry the device under test and drive the device under test to rotate. Please refer to Figure 1, the first magnetic scale includes a first magnetic head 4 and a first scale 1; the first scale 1 is disposed on the rotating body, and the first scale 1 extends in an arc shape along a first circumferential path, and the center of the first circumferential path coincides with the rotation center of the rotating body; the first magnetic head 4 is disposed on the base, and the first magnetic head 4 is arranged corresponding to the first circumferential path. Wherein, the first magnetic head 4 is used to read the magnetic signal on the first scale 1 and convert the magnetic signal into an electrical signal for calculating the rotation information of the rotating body.
[0042] Wherein, the first magnetic head 4 being arranged corresponding to the first circumferential path means that during the rotation of the first scale 1 following the rotating body, the first magnetic head 4 can correspond to the first scale 1 on the first circumferential path to read the magnetic signal on the first scale 1.
[0043] It should be noted that in this embodiment, since the first magnetic head 4 needs to emit an electrical signal for the controller in the wireless test system to operate, therefore, disposing the first magnetic head 4 on the fixed base can facilitate the circuit layout and signal transmission of the first magnetic head 4. It should be understood that without considering the circuit arrangement, in other embodiments, disposing the first magnetic head 4 on the rotatable rotating body and disposing the first scale 1 on the fixed base can be regarded as an equivalent solution to the above embodiment.
[0044] As described above, the rotating body drives the workpiece to be measured to rotate, and at the same time drives the first scale 1 to rotate, which makes the first magnetic head 4 move relative to the first scale 1. At this time, the first magnetic head 4 can read the magnetic signals at different positions on the first scale 1 during the movement relative to the first scale 1. By measuring the number of grids on the first scale 1 passed by the first magnetic head 4, the corresponding angle information can be calculated, thereby realizing accurate angle detection, and thus improving the accuracy of the rotation angle detection of the turntable and improving the technical problems of poor accuracy and low precision in the rotation angle detection of the turntable in the prior art.
[0045] In addition, the "rotation information" mentioned above can refer to the angle information of the rotation of the rotating body, the circumferential distance information, etc.
[0046] Further, in this embodiment, the turntable further includes a second magnetic scale, please refer to Figure 1 , the second magnetic scale includes a second magnetic head 3 and a second scale 2; the second scale 2 is disposed on the rotating body, and the second scale 2 extends in an arc shape along a second circumferential path, and the center of the second circumferential path coincides with the center of the first circumferential path; the second magnetic head 3 is disposed on the base, and the second magnetic head 3 is arranged corresponding to the second circumferential path; the second magnetic head 3 is used to read the magnetic signal on the second scale 2 and convert the magnetic signal into an electrical signal for calculating the rotation information of the rotating body.
[0047] It should be noted that the second magnetic head 3 corresponds to the second circumferential path representation. During the rotation of the rotation body following the second scale 2, the second magnetic head 3 can correspond to the second scale 2 on the second circumferential path to read the magnetic signal on the second scale 2. Moreover, the "rotation information" contained in the electrical signal converted by the second magnetic head 3 also represents the angle information of the rotation of the rotation body, the circumferential distance information, etc.
[0048] Among them, during the rotation of the rotation body, the first magnetic head 4 corresponds to the first scale 1, and / or the second magnetic head 3 corresponds to the second scale 2. In other words, during the rotation of the rotation body, the corresponding relationship between the first magnetic head 4 and the first scale 1 and the corresponding relationship between the second magnetic head 3 and the second scale 2 can form the following situations: 1. Only the first magnetic head 4 corresponds to the first scale 1; 2. Only the second magnetic head 3 corresponds to the second scale 2; 3. The first magnetic head 4 corresponds to the first scale 1 and the second magnetic head 3 corresponds to the second scale 2. In other words, at least one of the first magnetic head 4 and the second magnetic head 3 corresponds to the scale (the first scale 1 corresponds to the first magnetic head 4, and the second scale 2 corresponds to the second magnetic head 3), which can ensure that during the rotation of the rotation body, the detection of the rotation angle of the rotation body can be realized through the correspondence between the magnetic head and the scale (the first magnetic head 4 corresponds to the first scale 1, or the second magnetic head 3 corresponds to the second scale 2) when the rotation body rotates at any angle. Thus, even when the rotation body needs to rotate 360°, the purpose of improving the detection accuracy of the rotation angle of the rotation body can be achieved through the first magnetic scale and the second magnetic scale.
[0049] It should be understood that in other embodiments of the present application, when the rotation angle requirement of the rotation body is less than 360°, that is, when the rotation body does not need to rotate 360° to complete the wireless performance test operation, the setting method of canceling the second magnetic scale can be adopted; at this time, by covering the rotation angle of the rotation body with the radian of the first scale 1 (the radian of the first scale 1 is greater than or equal to the rotation angle of the rotation body), the purpose of improving the detection accuracy of the rotation angle of the rotation body can be achieved. When the first magnetic head 4 corresponds to the end position (the end) of the first scale 1, since the magnetic data reading at the end of the magnetic scale is unstable, there may be a situation where the detection accuracy is reduced. Therefore, when the rotation angle requirement of the rotation body is less than 360°, preferably, the radian of the first scale 1 is greater than the rotation angle of the rotation body.
[0050] In this embodiment, the line connecting the first magnetic head 4 and the center of the first circular path forms a first connection line, and the line connecting the projection of the second magnetic head 3 on the plane where the first circular path is located and the center of the first circular path forms a second connection line. The first connection line and the second connection line coincide. It can also be considered that the radial line of the first circular path corresponding to the first magnetic head 4 coincides with the radial line of the second circular path corresponding to the second magnetic head 3. In other words, the first circular path and the second circular path are divided in an equal division manner (for example, divided into 360 parts according to 360°), and degree markings are made on the first circular path and the second circular path (for example, each dividing line is marked from 0° to 360°, where the 0° dividing line and the 360° dividing line coincide). At the same time, each same-degree marking on the first circular path and the second circular path corresponds one by one in the radial direction (the 0° marking on the first circular path and the 0° marking on the second circular path are located on the same straight line in the radial direction). At this time, the degree markings corresponding to the first magnetic head 4 on the first circular path and the degree markings corresponding to the second magnetic head 3 on the second circular path are two corresponding degree markings (for example, the first magnetic head 4 corresponds to the 0° position of the first circular path, and the second magnetic head 3 corresponds to the 0° position of the second circular path). Based on this, the two ends of the second grating ruler 2 corresponding to the first grating ruler 1 form notches on the first circular path. Thus, it can be ensured that when the rotating body rotates 360°, the detection accuracy of the rotation angle can be improved by the correspondence between the magnetic head and the grating ruler at any position where the rotating body rotates. It can be understood that if only one grating ruler is spliced into a circular shape, although it can also cover the angle detection of 360°, due to the gap at the splicing position, when the magnetic head reads the number at the splicing position, the pulse count may show irregular jumps, resulting in reduced accuracy and poor repeatability.
[0051] It should be noted that the above method of dividing the first circular path and the second circular path is only for the convenience of describing the positions of the first magnetic head 4 and the second magnetic head 3. In practical applications, the rotation angle can be counted on the grating ruler without using dividing lines, and can be obtained by calculating the pulse count of the trigger switch, which will not be elaborated here.
[0052] Among them, setting the first magnetic head 4 and the second magnetic head 3 at the corresponding positions of the first circular path and the second circular path can facilitate the unified layout of the circuits of the first magnetic head 4 and the second magnetic head 3 and is convenient for circuit setting.
[0053] However, in other embodiments of the present application, please refer to Figure 2, when the position of the first magnetic head 4 on the first circumferential path does not correspond to the position of the second magnetic head 3 on the second circumferential path (the first magnetic head 4 corresponds to the 0° position on the first circumferential path, while the second magnetic head 3 corresponds to the 180° position on the second circumferential path), at this time, in order to ensure that there is at least one magnetic head corresponding to the corresponding grating scale at any position within the 360° rotation of the rotating body, the second grating scale 2 does not correspond to the notch of the first grating scale 1.
[0054] In addition, it should be noted that the notches formed by the two ends of the first grating scale 1 on the first circumferential path represent the notches formed by the unoccupied part of the first grating scale 1 on the first circumferential path, that is, starting from one end of the first grating scale 1, in the direction away from the first grating scale 1, along the first circumferential path to the other end of the first grating scale 1, the partial area of the first circumferential path spanned (such as Figure 1 the area marked by the dashed line A in the figure).
[0055] As mentioned above, when the first magnetic head 4 corresponds to the end position of the first grating scale 1, there is a situation where the detection accuracy decreases; similarly, when the second magnetic head 3 corresponds to the end position of the second grating scale 2, there is also a situation where the detection accuracy decreases. Therefore, to improve the above problems, preferably, the two ends of the first grating scale 1 coincide with the two ends of the second grating scale 2 in the radial direction of the first circumferential path. Based on this, during the rotation of the rotating body, when the first magnetic head 4 corresponds to the first grating scale 1 to detect the rotation angle of the rotating body, before the first magnetic head 4 moves to correspond to the end of the first grating scale 1 and the second magnetic head 3 has passed the position corresponding to the end of the second grating scale 2, at this time, the detection of the rotation angle of the rotating body is switched to the second magnetic head 3 corresponding to the second grating scale 2; similarly, when the rotating body continues to rotate, so that the second magnetic head 3 does not correspond to the end of the second grating scale 2 and the first magnetic head 4 has passed the position corresponding to the end of the first grating scale 1, the detection of the rotation angle of the rotating body is switched back to the first magnetic head 4 corresponding to the first grating scale 1. This can avoid the situation of detecting the rotation angle of the rotating body by the correspondence between the magnetic head and the end of the grating scale, thereby achieving the purpose of further improving the detection accuracy.
[0056] Furthermore, in this embodiment, the turntable further includes a triggering device, and both the first magnetic head 4 and the second magnetic head 3 are electrically connected to the triggering device. When the first magnetic head 4 and the second magnetic head 3 correspond to the preset positions of the overlapping part of the first grating scale 1 and the second grating scale 2, the triggering device emits an electrical signal for switching the start-stop states of the first magnetic head 4 and the second magnetic head 3. Among them, the preset position represents any position in the overlapping part of the first grating scale 1 and the second grating scale 2 (which can be set manually).
[0057] That is, when using the first magnetic head 4 corresponding to the first grating scale 1 to detect the rotation angle of the rotating body, when the first magnetic head 4 and the second magnetic head 3 correspond to the preset position, the triggering device emits an electrical signal, and switches to using the second magnetic head 3 corresponding to the second grating scale 2 to detect the rotation angle of the rotating body (switch the start / stop state of the first magnetic head 4 from the start state to the stop state, and switch the start / stop state of the second magnetic head 3 from the stop state to the start state). Similarly, when the rotating body continues to rotate so that the first magnetic head 4 and the second magnetic head 3 correspond to the preset position, it switches back to using the first magnetic head 4 corresponding to the first grating scale 1 to detect the rotation angle of the rotating body (switch the start / stop state of the first magnetic head 4 from the stop state to the start state, and switch the start / stop state of the second magnetic head 3 from the start state to the stop state). Through the setting of the triggering device, the switching of the start / stop states of the first magnetic head 4 and the second magnetic head 3 can be automatically completed, and during the rotation of the rotating body, the switching of the magnetic head and the grating scale can be automatically completed, and the detection of the rotation angle of the rotating body can be efficiently completed.
[0058] It should be noted that in some other embodiments of the present application, the above-mentioned triggering to switch the start / stop states of the first magnetic head 4 and the second magnetic head 3 may also refer to triggering the source of magnetic signal acquisition for the wireless performance test operation. For example, the start state of the first magnetic head 4 means that during the wireless performance test operation, the rotation angle of the rotating body is detected based on the magnetic signal obtained by the first magnetic head 4, and the wireless performance test is triggered when the preset rotation angle is reached; while when the first magnetic head 4 is in the stop state, it means that the rotation angle of the rotating body is not detected based on the magnetic signal read by the first magnetic head 4. Similarly, the start state of the second magnetic head 3 means that during the wireless performance test operation, the rotation angle of the rotating body is detected based on the magnetic signal obtained by the second magnetic head 3, and the wireless performance test is triggered when the preset rotation angle is reached; while when the second magnetic head 3 is in the stop state, it means that the rotation angle of the rotating body is not detected based on the magnetic signal read by the second magnetic head 3. That is to say, during the rotation of the rotating body, there is a state where the first magnetic head 4 is in the state of reading the magnetic signal on the first grating scale 1, and the second magnetic head 3 is simultaneously in the state of reading the magnetic signal on the second grating scale 2; at this time, the source of magnetic signal acquisition is judged based on the start / stop states of the first magnetic head 4 and the second magnetic head 3.
[0059] Preferably, please continue to refer to Figure 1, the overlapping part of the first scale 1 and the second scale 2 is divided into a first overlapping section 5 and a second overlapping section 6. The first overlapping section 5 and the second overlapping section 6 are located at both ends of the first scale 1 and also at both ends of the second scale 2. The triggering device includes a first trigger switch 7 and a second trigger switch 8. The first trigger switch 7 corresponds to the first overlapping section 5. When the first magnetic head 4 and the second magnetic head 3 are at a first preset position corresponding to the first overlapping section 5, the first trigger switch 7 emits an electrical signal for switching the start / stop states of the first magnetic head 4 and the second magnetic head 3. The second trigger switch 8 corresponds to the second overlapping section 6. When the first magnetic head 4 and the second magnetic head 3 are at a second preset position corresponding to the second overlapping section 6, the second trigger switch 8 emits an electrical signal for switching the start / stop states of the first magnetic head 4 and the second magnetic head 3. Optionally, in this embodiment, the first trigger switch 7 and the second trigger switch 8 can be optoelectronic switches. Of course, in other embodiments, the first trigger switch 7 and the second trigger switch 8 can also be proximity switches, pull rod switches, etc.
[0060] Among them, when the rotating body rotates in the forward direction (clockwise direction) (with the positions of the first magnetic head 4 and the second magnetic head 3 corresponding to the first scale 1 as the initial state), when the first magnetic head 4 and the second magnetic head 3 move to the first preset position, the first trigger switch 7 is triggered and emits an electrical signal, causing the start / stop state of the first magnetic head 4 to switch from the start state to the stop state, and at the same time causing the start / stop state of the second magnetic head 3 to switch from the stop state to the start state. The rotating body continues to rotate until the first magnetic head 4 and the second magnetic head 3 correspond to the second preset position, the second trigger switch 8 is triggered and emits an electrical signal, causing the start / stop state of the first magnetic head 4 to switch from the stop state to the start state, and at the same time causing the start / stop state of the second magnetic head 3 to switch from the start state to the stop state, and so on in a cycle.
[0061] Of course, when the rotating body rotates in the reverse direction (counterclockwise direction) (also with the positions of the first magnetic head 4 and the second magnetic head 3 corresponding to the first scale 1 as the initial state), when the first magnetic head 4 and the second magnetic head 3 move to the second preset position, the second trigger switch 8 is triggered and emits an electrical signal, causing the start / stop state of the first magnetic head 4 to switch from the start state to the stop state, and at the same time causing the start / stop state of the second magnetic head 3 to switch from the stop state to the start state. The rotating body continues to rotate until the first magnetic head 4 and the second magnetic head 3 correspond to the first preset position, the first trigger switch 7 is triggered and emits an electrical signal, causing the start / stop state of the first magnetic head 4 to switch from the stop state to the start state, and at the same time causing the start / stop state of the second magnetic head 3 to switch from the start state to the stop state, and so on in a cycle.
[0062] In this embodiment, the radius of the first circular path is equal to the radius of the second circular path, which makes calibration more convenient. Specifically, the first grating scale 1 and the second grating scale 2 are arranged vertically one above the other. It should be understood that in other embodiments of the present application, the radius of the first circular path is greater than the radius of the second circular path. That is to say, the first grating scale 1 is arranged outside the second grating scale 2. Alternatively, the second grating scale 2 can also be arranged outside the first grating scale 1, that is, the radius of the second circular path is greater than the radius of the first circular path.
[0063] In addition, in this embodiment, the radian of the first grating scale 1 is greater than the radian of the second grating scale 2. Setting the radian of the first grating scale 1 to be greater than the radian of the second grating scale 2 can make the distance between the two ends of the first grating scale 1 relatively close, so that the installation positions of the first trigger switch 7 and the second trigger switch 8 are relatively concentrated, which is convenient for installation and operation. Optionally, the radian of the first grating scale 1 can be 358° (one of the optional structures of the first grating scale 1 is as Figure 3 shown), and the radian of the second grating scale 2 is 4°. Of course, the radian value of the first grating scale 1 can also be any value within 360°, and similarly, the radian value of the second grating scale 2 can also be any value within 360°.
[0064] In this embodiment, the turntable further includes a third trigger switch, which is electrically connected to the second magnetic head 3. When the second magnetic head 3 corresponds to the third preset position on the second grating scale 2, the third trigger switch emits an electrical signal for triggering the start and stop of the test operation.
[0065] It should be noted that in other embodiments, when the start and stop position of the turntable corresponds to the preset area on the first grating scale 1, the third trigger switch can also be electrically connected to the first magnetic head 4, and the start and stop of the test operation can be triggered based on the correspondence between the first magnetic head 4 and the fourth preset position on the first grating scale 1.
[0066] Based on the turntable provided above, when the wireless test system applying this turntable performs a wireless performance test operation, the working process is as follows:
[0067] Among them, as Figure 1 , taking the middle position of the second grating scale 2 as the 0° position (i.e., the third preset position), correspondingly, in the overlapping area of the first grating scale 1 and the second grating scale 2, there are a -2° position (i.e., the first preset position) and a 2° position (i.e., the second preset position). Taking the initial positions of the first magnetic head 4 and the second magnetic head 3 at the -5° position and the rotating body rotating forward (clockwise direction) as an example for illustration. And taking the requirement of the wireless performance test operation as the rotating body rotating 360° as an example for illustration.
[0068] It should be noted that in the initial stage, the first magnetic head 4 can be in the starting state, or both the first magnetic head 4 and the second magnetic head 3 can be in the shutdown state; the rotating body rotates forward under the driving action of its corresponding driving device. When the first magnetic head 4 and the second magnetic head 3 correspond to the -2° position, the first trigger switch 7 is triggered, the second magnetic head 3 switches to the starting state, and the first magnetic head 4 is in the shutdown state. At this time, the second magnetic head 3 reads the magnetic signal on the second grating scale 2. The rotating body continues to rotate. When the first magnetic head 4 and the second magnetic head 3 correspond to the 0° position, the third trigger switch triggers the electrical signal for starting and stopping the test operation, so that the wireless performance test operation starts. The magnetic signal read by the second magnetic head 3 is used for detecting the rotation angle of the rotating body. The rotating body continues to rotate. When the first magnetic head 4 and the second magnetic head 3 correspond to the 2° position, the second trigger switch 8 is triggered, the first magnetic head 4 switches to the starting state, the second magnetic head 3 switches to the shutdown state, and the first magnetic head 4 reads the magnetic signal on the first grating scale 1, and continues to perform the detection of the rotation angle of the rotating body. The rotating body continues to rotate. When the first magnetic head 4 and the second magnetic head 3 correspond to the -2° position, the first trigger switch 7 is triggered, the first magnetic head 4 switches to the shutdown state, the second magnetic head 3 switches to the starting state, and at this time, the second magnetic head 3 reads the magnetic signal of the second grating scale 2, and continues to perform the detection of the rotation angle of the rotating body. The rotating body continues to rotate. When the first magnetic head 4 and the second magnetic head 3 correspond to the 0° position, the third trigger switch triggers the electrical signal for starting and stopping the test operation, so that the wireless performance test operation ends.
[0069] Correspondingly, in the wireless performance test operation, if the rotating body rotates in the reverse direction (rotates counterclockwise), the initial positions of the first magnetic head 4 and the second magnetic head 3 can be selected as the 5° position at this time to facilitate the rapid completion of the wireless performance test operation.
[0070] Based on the turntable provided above, an embodiment of the present application further provides a wireless test system. The wireless test system adopts the above turntable, and the turntable is connected to the test instrument of the wireless test system. The turntable sends the electrical signal for calculating the rotation information of the rotating body to the test instrument, and this electrical signal is used to trigger the test instrument to sample at the preset rotation angle of the turntable, so as to accurately perform the wireless performance test on the test piece at the preset angle. Based on this, the wireless test system provided in this embodiment can solve the technical problem of low test accuracy in the prior art due to poor accuracy and low precision in detecting the rotation angle of the turntable.
[0071] In summary, during the operation of the job, the rotating body drives the component to be measured to rotate. At the same time, the first grating ruler 1 is driven to rotate, causing the first magnetic head 4 to move relative to the first grating ruler 1. At this time, the first magnetic head 4 can read the magnetic signals at different positions on the first grating ruler 1 during the relative movement with respect to the first grating ruler 1. By counting the number of grids on the first grating ruler 1 passed by the first magnetic head 4, the corresponding angle information can be calculated, thereby achieving accurate angle detection, and thus improving the accuracy of detecting the rotation angle of the turntable and solving the technical problems of poor accuracy and low precision in detecting the rotation angle of the turntable in the prior art. Further, when the second grating ruler 2 is provided and, during the rotation of the rotating body, the first magnetic head 4 corresponds to the first grating ruler 1 and / or the second magnetic head 3 corresponds to the second grating ruler 2, during the 360° rotation of the rotating body, at least one of the first magnetic head 4 and the second magnetic head 3 corresponds to the grating ruler. Thus, the accuracy of detecting the rotation angle of the rotating body can be ensured through the correspondence between the grating ruler and the magnetic head, and the detection accuracy of the turntable in the case of a 360° rotation requirement can be improved. This can further achieve the purpose of solving the technical problems of poor accuracy and low precision in detecting the rotation angle of the turntable in the prior art.
[0072] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims
1. A turntable, applied to a wireless test system, for carrying a device under test and driving the device under test to rotate, characterized in that: The turntable comprises: Base; A rotating body is rotatably connected to the base; the rotating body is used to carry the measured object and drive the measured object to rotate; A first magnetic scale, comprising a first magnetic head and a first scale; the first scale is arranged on the rotating body, and the first scale extends in an arc shape along a first circumferential path, and the center of the first circumferential path coincides with the rotation center of the rotating body; the first magnetic head is arranged on the base, and the first magnetic head is arranged corresponding to the first circumferential path; The first magnetic head is used to read the magnetic signal on the first scale and convert the magnetic signal into an electrical signal for calculating the rotation information of the rotating body.
2. The turntable according to claim 1, characterized in that: The turntable further includes a second magnetic scale, which includes a second magnetic head and a second scale; the second scale is arranged on the rotating body, and the second scale extends in an arc shape along a second circumferential path, and the center of the second circumferential path coincides with the center of the first circumferential path; the second magnetic head is arranged on the base, and the second magnetic head is arranged corresponding to the second circumferential path; the second magnetic head is used to read the magnetic signal on the second scale and convert the magnetic signal into an electrical signal for calculating the rotation information of the rotating body; Wherein, during the rotation of the rotating body, the first magnetic head corresponds to the first scale, and / or the second magnetic head corresponds to the second scale.
3. The turntable according to claim 2, characterized in that: The line connecting the first magnetic head and the center of the first circular path forms a first line, the projection of the second magnetic head on the plane where the first circular path is located and the line connecting the center of the first circular path form a second line, and the first line and the second line coincide with each other; the second scale corresponds to the gap formed by the two ends of the first scale on the first circular path.
4. The turntable according to claim 3, characterized in that: Two ends of the first scale coincide with two ends of the second scale in a radial direction of the first circumferential path.
5. The turntable according to claim 4, characterized in that: The turntable further comprises a trigger device, and the first magnetic head and the second magnetic head are both electrically connected to the trigger device; When the first magnetic head and the second magnetic head correspond to the preset positions of the overlapping parts of the first scale and the second scale, the trigger device sends an electrical signal for switching the start and stop states of the first magnetic head and the second magnetic head.
6. The turntable according to claim 5, characterized in that: The overlapping portion of the first scale and the second scale is divided into a first overlapping section and a second overlapping section; The trigger device includes a first trigger switch and a second trigger switch, the first trigger switch corresponds to the first overlapping section, when the first magnetic head and the second magnetic head correspond to the first preset position of the first overlapping section, the first trigger switch sends an electrical signal for switching the start and stop states of the first magnetic head and the start and stop states of the second magnetic head; the second trigger switch corresponds to the second overlapping section, when the first magnetic head and the second magnetic head correspond to the second preset position of the second overlapping section, the second trigger switch sends an electrical signal for switching the start and stop states of the first magnetic head and the start and stop states of the second magnetic head.
7. The turntable according to claim 2, characterized in that: The radius of the first circumferential path is equal to the radius of the second circumferential path.
8. The turntable according to claim 2, characterized in that: The curvature of the first scale is greater than the curvature of the second scale.
9. The turntable according to claim 8, characterized in that: The turntable further includes a third trigger switch, the third trigger switch is electrically connected to the second magnetic head, and when the second magnetic head corresponds to a third preset position on the second scale, the third trigger switch sends an electrical signal for triggering the start and stop of the test operation; or, The third trigger switch is electrically connected to the first magnetic head. When the first magnetic head corresponds to a fourth preset position on the first scale, the third trigger switch sends an electrical signal for triggering the start and stop of a test operation.
10. A wireless testing system, characterized in that: It comprises a test meter and a turntable as claimed in any one of claims 1 to 9, wherein the turntable is connected to the test meter, and the test meter is used for sampling according to the electrical signal representing a preset rotation angle.