Transmission system of measuring seat

Abstract

The utility model describes a transmission system of a measuring seat, which is used for driving a measuring head arranged on the measuring seat to rotate, the transmission system comprises a transmission wheel, a positioning wheel and a pre-tightening mechanism, the transmission wheel rotates under the action of a driving mechanism, the measuring head is linked with the transmission wheel to enable the transmission wheel to drive the measuring head to rotate, the positioning wheel is meshed with the transmission wheel, and the pre-tightening mechanism is arranged on the positioning wheel. The pre-tightening mechanism is connected with the positioning wheel and applies pre-tightening torsion to the positioning wheel so that the tooth surface of the positioning wheel can abut against the tooth surface of the transmission wheel, and the pre-tightening torque generated by the pre-tightening torsion on the positioning wheel is smaller than the driving torque generated by the driving mechanism on the transmission wheel. The positioning wheel is arranged on the angle measuring mechanism so that the rotation angle of the positioning wheel can be measured through the angle measuring mechanism. According to the utility model, the transmission system of the measuring seat can improve the measuring precision.

Description

TECHNICAL FIELD

[0001] The utility model relates to intelligent manufacturing equipment industry field, specifically related to a transmission system of measuring seat. BACKGROUND

[0002] Three coordinate measuring machine refers to the measuring ability of the instrument in a hexahedron space, which can show geometric shape, length and circumference graduation, also known as three coordinate measuring machine or three coordinate measuring machine. Three coordinate measuring machine can also be defined as "an instrument with a probe that can move in three directions, which can move on three mutually perpendicular guide rails, the probe transmits signals in contact or non-contact mode, and the displacement measurement system (such as grating ruler) of three axes calculates the points (x, y, z) of workpiece and various function measurements through data processor or computer."

[0003] Three coordinate measuring machine usually includes probe and measuring seat, the measuring seat is provided with rotating shaft for controlling the rotation of probe, encoder for recording the current rotation angle of rotating shaft, and driving motor for driving the rotation of rotating shaft. The gear of encoder is engaged with the gear of rotating shaft, so that the encoder can measure the rotation angle of probe in real time. In the prior art, the gap between the gear of encoder and the gear of rotating shaft is generally reduced to reduce the measurement error.

[0004] However, if the gap is too small, the processing and assembly process requirements are higher, and the gear is easy to be stuck, so that the probe is difficult to rotate; if the gap is too large, the gear of encoder is difficult to accurately reflect the rotation angle of the gear of rotating shaft, which causes measurement error. SUMMARY

[0005] The utility model discloses a transmission system of measuring seat that can improve the measurement precision.

[0006] Therefore, the utility model provides a transmission system of measuring seat, which is used for driving the rotation of the probe arranged in the measuring seat, and includes a transmission wheel, a positioning wheel and a pre-tightening mechanism. The transmission wheel rotates under the action of a driving mechanism. The probe is linked with the transmission wheel to drive the transmission wheel to rotate. The positioning wheel is engaged with the transmission wheel. The pre-tightening mechanism is connected with the positioning wheel and applies a pre-tightening torque to the positioning wheel to make the tooth surface of the positioning wheel abut against the tooth surface of the transmission wheel. The pre-tightening torque generated by the pre-tightening mechanism on the positioning wheel is smaller than the driving torque generated by the driving mechanism on the transmission wheel. The positioning wheel is arranged in an angle measuring mechanism to measure the rotation angle of the positioning wheel through the angle measuring mechanism.

[0007] In the utility model, the pre-tightening mechanism exerts pre-tightening torque on the positioning wheel, and generates pre-tightening torque on the positioning wheel, and because the pre-tightening torque has directionality, in the rotating process, the tooth surface of the positioning wheel is always in contact with the tooth surface of the transmission wheel from a single direction under the action of the pre-tightening torque, thereby the gap between the tooth surfaces can be conveniently eliminated, and at the same time, a certain gap is reserved between the tooth surfaces on the other side, thereby the positioning wheel can be prevented from being locked with the transmission wheel. In addition, because the pre-tightening torque is smaller than the driving torque, the positioning wheel can reduce the obstruction to the transmission wheel. In summary, no matter how the transmission wheel rotates, the positioning wheel can rotate along with the transmission wheel without affecting the transmission wheel, thereby the rotating angle of the transmission wheel can be accurately reflected, that is, the rotating angle of the measuring head can be more accurately reflected, and thereby the measurement precision is improved.

[0008] In addition, in the transmission system of the measuring seat, the pre-tightening mechanism comprises an elastic element, and the elastic element generates pressure in the circumferential direction of the positioning wheel. Therefore, the pre-tightening mechanism can generate pre-tightening torque.

[0009] In addition, in the transmission system of the measuring seat, the elastic element is a torsion spring or a coil spring. In this case, because the structure of the torsion spring or the coil spring is relatively simple and easy to miniaturize, the structure of the transmission system can be simplified.

[0010] In addition, in the transmission system of the measuring seat, the elastic element is a torsion spring, and the maximum torsion angle of the torsion spring is not less than 360 degrees. In this case, in the rotating process of the positioning wheel, the torsion spring can be prevented from being excessively twisted and plastically deformed, thereby the reliability of the transmission system is improved.

[0011] In addition, in the transmission system of the measuring seat, the angle measuring mechanism is fixedly arranged on the measuring seat, one end of the pre-tightening mechanism is connected to the angle measuring mechanism, and the other end is connected to the positioning wheel. In this case, by fixing one end of the pre-tightening mechanism, the pre-tightening mechanism can stably exert pre-tightening torque.

[0012] In addition, in the transmission system of the measuring seat, the positioning wheel has an assembly structure, the pre-tightening mechanism is fixedly connected to the assembly structure, and the assembly structure is a groove or a through hole. Therefore, the pre-tightening mechanism can be connected to the positioning wheel.

[0013] In addition, in the transmission system of the measuring seat, the number of assembly structures is multiple, the multiple assembly structures are arranged around the center of the positioning wheel, and the pre-tightening torque is different when the pre-tightening mechanism is fixed to different assembly structures. Therefore, the size of the pre-tightening torque can be conveniently adjusted.

[0014] In addition, the transmission system of the measuring seat further comprises a fixing structure, and the transmission wheel is close to the fixing structure and is clamped to the fixing structure after rotation stops.

[0015] In addition, the transmission system of the measuring seat further comprises a fixing structure, and the transmission wheel is close to the fixing structure and is clamped to the fixing structure after rotation stops.

[0016] In addition, the transmission system of the measuring seat further comprises a fixing structure, and the transmission wheel is close to the fixing structure and is clamped to the fixing structure after rotation stops.

[0017] According to the utility model, a transmission system of a measuring seat capable of improving measurement precision is provided. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model will be explained in further detail only by example by referring to the drawings.

[0019] Figure 1 It is the three -dimensional schematic view that example of the utility model relates to three -coordinate measuring machine has shown.

[0020] Figure 2 is a three-dimensional schematic view of a probe of a three-coordinate measuring machine according to the present application.

[0021] Figure 3 is an exploded view of a transmission system according to the present application.

[0022] Figure 4A is a schematic view of a transmission wheel and a fixing structure in a first state according to the present application.

[0023] Figure 4B is a schematic view of a transmission wheel and a fixing structure in a second state according to the present application.

[0024] Figure 4C is a schematic view of a transmission wheel and a fixing structure in a third state according to the present application.

[0025] Figure 5 is a three-dimensional schematic view of a drive wheel, a transmission wheel and a positioning wheel according to the present application.

[0026] Figure 6 is a schematic view of a drive wheel and a transmission wheel being driven by a belt according to the present application.

[0027] Figure 7 is a schematic view of a part of a transmission wheel according to the present application.

[0028] Figure 8 is a schematic view of a fixing structure according to the present application. Figure 3 from a direction A.

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] 1…three-coordinate measuring machine, 10…probe, 11…measuring seat, 111…first rotating mechanism, 112…second rotating mechanism, 12…measuring head, 13…transmission system, 14…transmission wheel, 14a…first transmission wheel, 14b…second transmission wheel, 141…first clamping member, 1411…first clamping arm, 1412…second clamping arm, 142…first clamping surface, 15…fixing structure, 151…second clamping member, 152…second clamping surface, 16…positioning wheel, 161…assembly structure, 162…rotating shaft, 17…angle measuring mechanism, 18…drive wheel, 19…pre-tightening mechanism, 191…elastic element, A1…first measuring head rotating axis, A2…second measuring head rotating axis, C1…groove structure, C2…convex structure. DETAILED DESCRIPTION

[0031] Hereinafter, preferred embodiments of the present application will be described in detail with reference to the accompanying drawings. In the following description, identical components are assigned with identical reference numerals, and overlapping description will be omitted. In addition, the drawings are schematic ones, and the ratio of the dimensions between components or the shape of the components, etc. can be different from the actual ones.

[0032] It should be noted that the terms "comprising" and "having" and any variations thereof, such as a series of steps or units included or having in the process, method, system, product or device, are not necessarily limited to those steps or units clearly listed, but can include or have other steps or units not clearly listed or inherent to the process, method, product or device.

[0033] It should be noted that in this document, the relative position and direction terms such as "up", "towards up", "down", "towards down", "vertical direction", "left side", "towards left side", "left", "towards left", "right side", "towards right side", "right", "towards right", "horizontal direction", "front", "towards front", "back", "towards back", "front-back direction" are referred to the usual operating posture, and should not be considered as restrictive.

[0034] Firstly, the related terms involved in the present application are introduced.

[0035] The "rotation angle" can be understood in the following way: the measuring head can have a radial reference line, when the reference line is at the initial position, the rotation angle can be 0 degrees; when the reference line is not at the initial position, the rotation angle can be the included angle between the reference line and the initial position.

[0036] The "rotation accuracy" can be the accuracy of the measuring head rotating to the target angle (or expected angle), after the measuring head rotates, the closer the actual rotation angle of the measuring head to the target angle, the higher the rotation accuracy.

[0037] The present application can improve the measurement accuracy of the rotation angle measurement of the measuring head. In the present application, by setting a pre-tightening mechanism on the positioning wheel and continuously applying a torsion to the positioning wheel by the pre-tightening mechanism, the positioning wheel can always be closely engaged with the transmission wheel during rotation, so that the rotation angle of the positioning wheel can more accurately reflect the rotation angle of the transmission wheel (i.e. the rotation angle of the measuring head), at this time, by measuring the rotation angle of the positioning wheel by the angle measuring mechanism, the rotation angle of the measuring head with higher accuracy can be measured.

[0038] In some examples, the transmission system of the measuring seat involved in the present application can also be referred to as a transmission system, a rotation system or a transmission system of a three-coordinate measuring machine, etc.

[0039] The transmission system of the measuring seat (hereinafter referred to as the transmission system) involved in the utility model is described in detail below with reference to the drawings.

[0040] Figure 1 is a three-dimensional schematic view showing a three-coordinate measuring machine 1 involved in the utility model example. Figure 2 is a three-dimensional schematic view showing a probe 10 of the three-coordinate measuring machine 1 involved in the utility model example.

[0041] The utility model relates to a kind of three-coordinate measuring machines 1, referring to Figure 1 , can include probe 10 and the guide rail movement system controllable probe 10 moves along multiple guide rails, guide rail movement system can include the X-axis guide rail movement system of control probe 10 moves along X-axis guide rail, Y-axis guide rail movement system of control probe 10 moves along Y-axis guide rail and Z-axis guide rail movement system of control probe 10 moves along Z-axis guide rail.

[0042] The utility model relates to a kind of probes 10, referring to Figure 2 , can be set in the guide rail movement system of three-coordinate measuring machine 1, probe 10 can include measuring seat 11 and the measuring head 12 of setting in measuring seat 11.

[0043] In some examples, measuring seat 11 can include multiple rotating mechanisms. Rotating mechanism can control the rotation of measuring head 12 around different rotation axes. For example, referring to Figure 2 , multiple rotating mechanisms can include first rotating mechanism 111 and second rotating mechanism 112, first rotating mechanism 111 can control the rotation of measuring head 12 around first measuring head rotation axis A1, and second rotating mechanism 112 can control the rotation of measuring head 12 around second measuring head rotation axis A2. In some examples, first measuring head rotation axis A1 can be the axis of the input shaft (described later) of transmission system 13, and second measuring head rotation axis A2 can be the axis of the output shaft (described later) of transmission system 13.

[0044] In some examples, referring to Figure 2 , second rotating mechanism 112 can be set in first rotating mechanism 111, and measuring head 12 can be set in second rotating mechanism 112. In this case, first rotating mechanism 111 controls the rotation of second rotating mechanism 112 around first measuring head rotation axis A1, which can facilitate the rotation of measuring head 12 around first measuring head rotation axis A1.

[0045] The utility model describes a transmission system 13, transmission system 13 can be located in the arbitrary one or more rotating mechanism (for example first rotating mechanism 111 and / or second rotating mechanism 112) of measuring seat 11, that is, the arbitrary one or more rotating mechanism can include transmission system 13.In some examples, transmission system 13 can be used to drive the rotation of measuring head 12.

[0046] In some examples, the rotating mechanism can also include a driving mechanism. The driving mechanism can be configured to generate a driving force. In some examples, the driving mechanism can be a driving motor.

[0047] In some examples, the input shaft of transmission system 13 can be connected to the driving mechanism, and the output shaft can be connected to measuring head 12 or other rotating mechanisms. In this case, under the action of the driving force of the driving mechanism, transmission system 13 can directly drive measuring head 12 provided on measuring seat 11 to rotate, or drive measuring head 12 to rotate by controlling other rotating mechanisms.

[0048] Figure 3 is shown in the utility model example the explosion map of transmission system 13 involved.

[0049] In some examples, referring to Figure 3 , transmission system 13 can include transmission wheel 14. In some examples, transmission wheel 14 can rotate under the action of the driving mechanism. In other words, the driving mechanism can drive transmission wheel 14.

[0050] In some examples, transmission wheel 14 can be linked with measuring head 12. Transmission wheel 14 can drive measuring head 12 to rotate. In some examples, transmission wheel 14 and measuring head 12 can be linked to drive measuring head 12 to rotate.

[0051] In some examples, referring to Figure 3 , transmission system 13 can include fixed structure 15. In some examples, fixed structure 15 can be fixedly connected with the shell of the rotating mechanism. Thus, fixed structure 15 can be conveniently fixed.

[0052] In some examples, transmission wheel 14 can rotate relative to fixed structure 15.

[0053] In some examples, transmission wheel 14 can be clamped to fixed structure 15. Thus, transmission wheel 14 can be conveniently fixed at the current rotation angle. In some examples, when transmission wheel 14 is clamped to fixed structure 15, transmission wheel 14 can be fixed to fixed structure 15. In some examples, fixed structure 15 can provide a fixed clamping position for transmission wheel 14.

[0054] Figure 4Ais a schematic view showing that the transmission wheel 14 and the fixing structure 15 are in the first state. Figure 4B is a schematic view showing that the transmission wheel 14 and the fixing structure 15 are in the second state. Figure 4C is a schematic view showing that the transmission wheel 14 and the fixing structure 15 are in the third state.

[0055] In some examples, the transmission wheel 14 can be close to or away from the fixing structure 15. In some examples, the transmission wheel 14 can be close to the fixing structure 15 to be clamped to the fixing structure 15 (see Figure 4A , Figure 4B and Figure 4C ); or away from the fixing structure 15 to rotate. For example, after the transmission wheel 14 stops rotating, the transmission wheel 14 can be close to the fixing structure 15; after the transmission wheel 14 is away from the fixing structure 15, the transmission wheel 14 can rotate. In some examples, the transmission wheel 14 and the fixing structure 15 can be in the first state of being away from each other and the transmission wheel 14 being rotatable relative to the fixing structure 15. The transmission wheel 14 and the fixing structure 15 can also be in the second state of being close to each other before being clamped. The transmission wheel 14 and the fixing structure 15 can also be in the third state of being clamped to each other and the transmission wheel being not rotatable.

[0056] In some examples, the transmission wheel 14 can be clamped to the fixing structure 15 by lifting. In some examples, the transmission wheel 14 can be unclamped from the fixing structure 15 by releasing. In some examples, the measuring seat 11 can be provided with a lifting mechanism for lifting or releasing the transmission wheel 14. In some examples, the lifting mechanism can be any driving straight reciprocating motion mechanism for the transmission wheel 14, for example, the lifting mechanism can be a crank slider mechanism, an eccentric wheel mechanism, a slot wheel mechanism, a cam mechanism, etc. In some examples, the lifting mechanism can be arranged on the fixing structure 15.

[0057] In some examples, referring to Figure 3 , the transmission wheel 14 can be provided with a first clamping piece 141. The position of the first clamping piece 141 on the transmission wheel 14 can be fixed. For example, the first clamping piece 141 can be fixedly connected with the transmission wheel 14.

[0058] In some examples, referring to Figure 3 , the fixing structure 15 can be provided with a second clamping piece 151. The position of the second clamping piece 151 on the fixing structure 15 can be fixed. For example, the second clamping piece 151 can be fixedly connected with the fixing structure 15.

[0059] In some examples, the second clamping piece 151 can be clamped with the first clamping piece 141. In some examples, the second clamping piece 151 can be a plurality of (seeFigure 3 In this case, by engaging the first engaging member 141 with multiple second engaging members 151 located at different fixed positions, it is possible for the multiple second engaging members 151 at different positions to engage the transmission wheel 14 to different preset positions, thereby allowing the probe 12 to rotate to the preset position. Specifically, since the transmission wheel 14 can rotate under the action of the drive motor, and after rotation stops, it can approach and engage with the fixed structure 15, the rotational accuracy of the transmission wheel 14 (which can also be considered as the rotational accuracy of the probe 12) is related to the positional accuracy (i.e., the machining accuracy) of the second engaging members 151. When the control accuracy of the drive motor is low, limiting the rotational angle of the transmission wheel 14 by engaging the transmission wheel 14 with the fixed structure 15 can improve the rotational accuracy of the probe 12.

[0060] However, this invention is not limited to this. The rotational accuracy of the transmission wheel 14 can also be related to the positional accuracy (i.e., machining accuracy) of the first engaging member 141. Specifically, the transmission wheel 14 can be provided with multiple first engaging members 141, and the fixing structure 15 can be provided with at least one second engaging member 151 that can engage with the first engaging members 141. At the same time, the position of the first engaging member 141 on the transmission wheel 14 is fixed. In this case, the second engaging member 151 is engaged by multiple first engaging members 141 located in different fixed positions. When any second engaging member 151 engages with a first engaging member 141 at a different position, the rotational angle of the transmission wheel 14 is different. At this time, the rotational accuracy of the transmission wheel 14 is related to the positional accuracy (i.e., machining accuracy) of the first engaging member 141.

[0061] See in some examples Figure 3 The first engaging member 141 may be disposed on the drive wheel 14. In some examples, the engagement of the drive wheel 14 with the fixed structure 15 can be understood as the engagement of the drive wheel 14 with the fixed structure 15, the engagement of the first engaging member 141 with the second engaging member 151, or the engagement of the groove structure C1 with the convex structure C2 (described later), etc.

[0062] Figure 5 This is a perspective view showing the drive wheel 18, transmission wheel 14 and positioning wheel 16 involved in the example of this utility model. Figure 6 This is a schematic diagram showing the drive wheel 18 and transmission wheel 14 driven by a belt in this utility model example.

[0063] See in some examples Figure 5 The transmission system 13 may include a positioning wheel 16. The positioning wheel 16 can be used to measure the rotation angle of the transmission wheel 14. In some examples, the positioning wheel 16 may be linked with the transmission wheel 14.

[0064] In some examples, the positioning wheel 16 and the transmission wheel 14 can be linked by means of belt drive, gear drive, synchronous belt drive, or fixed connection. This allows for the selection of a suitable transmission method based on the actual situation.

[0065] In some examples, both the positioning wheel 16 and the drive wheel 14 can be gears. In some examples, the positioning wheel 16 can mesh with the drive wheel 14.

[0066] See in some examples Figure 5 The coordinate measuring machine 1 may include an angle measuring mechanism 17. A positioning wheel 16 may be disposed on the angle measuring mechanism 17. In some examples, the rotation angle of the positioning wheel 16 can be measured via the angle measuring mechanism 17.

[0067] In some examples, the angle measuring mechanism 17 can be any mechanism capable of measuring the rotation angle of the positioning wheel 16. For example, the angle measuring mechanism 17 can be a linear scale or an encoder.

[0068] See in some examples Figure 5 The transmission system 13 may include a drive wheel 18. The drive wheel 18 can be used to provide driving force to the transmission wheel 14. The drive wheel 18 can be linked with the transmission wheel 14.

[0069] In some examples, drive wheel 18 and transmission wheel 14 can be driven by a belt (see [link]). Figure 6 Linkage can be achieved through gear transmission or synchronous belt transmission. In this case, the appropriate transmission method can be selected according to the actual situation.

[0070] In some examples, the drive wheel 18 can be directly connected to the drive motor.

[0071] In some examples, the control precision of the drive motor may not meet the requirements for the rotational precision of the probe 12, making it difficult for the probe 12 (which can also be considered as the transmission wheel 14 linked to the probe 12) to rotate to the target angle (i.e., the rotation angle to which the probe 12 is rotated based on measurement requirements during the workpiece measurement process). In this case, the drive motor can be used to drive the probe 12 to rotate to near the target angle. For example, during the rotation of the probe 12, if the target angle is 41.1 degrees, meaning the probe 12 needs to be rotated to 41.1 degrees, but the control precision of the drive motor is only 1 degree, meaning the drive motor can only rotate the probe 12 to 41 degrees or 42 degrees, the drive motor can be used to drive the probe 12 to rotate to 41 degrees and then stop driving. Then, the rotational precision of the probe 12 can be improved by engaging the transmission wheel 14 and the fixed structure 15 (described in detail later).

[0072] In some examples, the positioning wheel 16 and the drive wheel 18 may not be in direct contact. In some examples, due to limitations in the control precision of the drive mechanism, the rotation angle of the drive wheel 18 may not be the target angle; that is, the rotation angle of the drive wheel 18 itself has an error. Even if the rotation angle of the drive wheel 18 is measured by the angle measuring mechanism 17 with high measurement precision, it is difficult to eliminate or reduce the error of the measurement result. Therefore, the angle measured by the angle measuring mechanism 17 can be the rotation angle of the transmission wheel 14. In this case, since the rotation angle of the transmission wheel 14 is the same as the rotation angle of the probe 12, using the positioning wheel 16 to represent the rotation angle of the transmission wheel 14 can help the angle measuring mechanism 17 measure the rotation angle of the probe 12, thereby determining whether the probe 12 is at the target angle.

[0073] In some examples, the backlash between the drive mechanism (or drive wheel 18) and the transmission wheel 14 may not be less than a first preset value. The backlash can also be represented by dead zone or return clearance, and the first preset value can be represented by arc minutes. In this case, when the drive wheel 18 stops rotating and is fixed, the transmission wheel 14 may rotate to near the target angle. At this time, the transmission wheel 14 can continue to rotate by approaching and engaging with the fixed structure 15 until it reaches the target angle. Since the backlash is not less than the first preset value, sufficient space for the transmission wheel 14 to continue rotating is maintained during engagement, helping to avoid the situation where the transmission wheel 14 cannot continue to rotate due to the fixed drive wheel 18, thus allowing the transmission wheel 14 to rotate to the target angle and improving rotational accuracy. In other words, since the transmission wheel 14 can only engage with the fixed structure 15 after reaching a specific angle, when the drive motor stops, the angle at which the transmission wheel 14 is located may not be able to engage with the fixed structure 15. The existence of the backlash allows the transmission wheel 14 to continue rotating, thus allowing the transmission wheel 14 to rotate to an angle where it can engage with the fixed structure 15.

[0074] In some examples, the magnitude of the first preset value can be related to the distance between adjacent second engaging members 151. For example, the more second engaging members 151 there are, the more rotation angles the drive wheel 14 can engage with the fixed structure 15, that is, the more precise positions the drive wheel 14 can be in, the smaller the distance between adjacent second engaging members 151, and the smaller the backlash between the drive wheel 18 and the drive wheel 14. In other words, the magnitude of the first preset value can be matched with the distance between adjacent second engaging members 151.

[0075] In some examples, after the drive wheel 18 (or drive motor) stops rotating and is fixed, the transmission wheel 14 can continue to rotate within a rotational allowance. In some examples, a first preset value can be matched with the rotational allowance. For example, the first preset value can be greater than or equal to the rotational allowance. In some examples, when the transmission wheel 14 rotates within the rotational allowance, the number of engageable second engaging members 151 for any one first engaging member 141 is not less than one.

[0076] In some examples, the number of drive wheels 14 can be at least one. In some examples, the drive wheels 14 may include a first drive wheel 14a and a second drive wheel 14b arranged coaxially. The first drive wheel 14a may be linked with the drive wheel 18. The second drive wheel 14b may be linked with the positioning wheel 16.

[0077] In some examples, the back clearance between the first transmission wheel 14a and the drive wheel 18 may not be less than a first preset value.

[0078] In some examples, the first transmission wheel 14a and the second transmission wheel 14b can be different in size and have different numbers of teeth. This allows for different transmission ratios. In other examples, the first transmission wheel 14a and the second transmission wheel 14b can be the same in size and have the same number of teeth.

[0079] In some examples, the transmission ratio between the drive wheel 18 and the first transmission wheel 14a can be less than 1. This allows for a reduction in the rotational speed of the transmission wheel 14, thereby improving the control accuracy of the transmission wheel 14 during rotation.

[0080] In some examples, the transmission ratio of the positioning wheel 16 and the second transmission wheel 14b can be 1. In this case, it helps to make the rotation angle of the positioning wheel 16 the same as the rotation angle of the second transmission wheel 14b, so that the rotation angle of the second transmission wheel 14b can be more intuitively represented by the rotation angle of the positioning wheel 16. In other examples, the transmission ratio of the positioning wheel 16 and the second transmission wheel 14b can also be greater than or less than 1.

[0081] However, this utility model is not limited to this. There may be only one transmission wheel 14. In this case, the transmission wheel 14 can mesh with both the drive wheel 18 and the positioning wheel 16 at the same time.

[0082] In some examples, the back clearance between the drive wheel 18 and the transmission wheel 14 can be formed in various ways. For example, the back clearance between the drive wheel 18 and the transmission wheel 14 can be increased by increasing the groove width of the drive wheel 18, reducing the tooth thickness of the first transmission wheel 14a, increasing the distance between the drive wheel 18 and the first transmission wheel 14a, or using belt drive, until the back clearance between the drive wheel 18 and the transmission wheel 14 is greater than a first preset value.

[0083] In some examples, the backlash between the second drive wheel 14b and the positioning wheel 16 may not exceed a second preset value. In some examples, the backlash between the second drive wheel 14b and the positioning wheel 16 may not exceed the backlash between the first drive wheel 14a and the drive wheel 18. In this case, by having a smaller backlash between the second drive wheel 14b and the positioning wheel 16, the positioning wheel 16 can more accurately reflect the rotation angle of the second drive wheel 14b, thereby improving measurement accuracy.

[0084] Figure 7 This is a schematic diagram showing a portion of the structure of the transmission wheel 14 involved in this utility model example. Figure 8 It shows Figure 3 A schematic diagram of the fixed structure 15 from the perspective of the central direction A.

[0085] See in some examples Figure 7 The surface of the drive wheel 14 near the fixed structure 15 can be designated as the first engagement surface 142. A first engagement member 141 can be disposed on the first engagement surface 142. In some examples, the first engagement member 141 can form a concave groove structure C1.

[0086] See in some examples Figure 8 The surface of the fixing structure 15 near the drive wheel 14 can be designated as the second engagement surface 152. A second engagement member 151 can be disposed on the second engagement surface 152. In some examples, the second engagement member 151 can form a raised convex structure C2.

[0087] In some examples, the shape of the groove structure C1 can match the shape of the convex structure C2. For example, the shape of the groove structure C1 can be complementary to the shape of the convex structure C2. In some examples, when the drive wheel 14 approaches the fixed structure 15, the drive wheel 14 can engage with the fixed structure 15 in such a way that the groove structure C1 engages with the convex structure C2. In this case, when the drive wheel 14 approaches the fixed structure 15, the drive wheel 14 engages with the fixed structure 15 by engaging the groove structure C1 with the convex structure C2, which can fix its own rotation angle, thereby allowing the drive wheel 14 to be in a position with high precision when engaged with the fixed structure 15. However, the present invention is not limited to this. In some examples, the first engaging member 141 can also form a raised convex structure C2, and the second engaging member 151 can also form a concave groove structure C1.

[0088] In some examples, the first engaging member 141 can be formed with a recessed groove structure C1 in different ways. In some examples, the first engaging member 141 may include a first engaging arm 1411 and a second engaging arm 1412. A gap may be present between the first engaging arm 1411 and the second engaging arm 1412 to form the recessed groove structure C1. This facilitates the formation of the recessed groove structure C1 in the first engaging member 141. In other examples, a groove may also be machined into the surface of the first engaging member 141 to form the groove structure C1.

[0089] In some examples, when the drive wheel 14 is engaged with the fixed structure 15, the first engaging arm 1411 and the second engaging arm 1412 can engage the corresponding second engaging member 151. In this case, by engaging the first engaging member 141 with multiple second engaging members 151 located at different fixed positions, the drive wheel 14 can be engaged to different preset positions. Since the rotational accuracy of the drive wheel 14 is related to the positional accuracy (i.e., machining accuracy) of the second engaging member 151, it is convenient to improve the rotational accuracy of the drive wheel 14 by improving the machining accuracy. In some examples, the corresponding second engaging member 151 can refer to the second engaging member 151 closest to any one of the first engaging members 141 (or groove structure C1) when the drive wheel 14 stops rotating.

[0090] See in some examples Figure 7 The number of first engaging members 141 can be multiple. For example, the number of first engaging members 141 can be 2, 3, 4, or 5. Preferably, the number of first engaging members 141 can be 3. In this case, since at least three points can define a plane, when the 3 first engaging members 141 engage with different second engaging members 151, the transmission wheel 14 can be stably engaged with the fixed structure 15.

[0091] In some examples, the drive wheel 14 may be provided with at least three first engaging members 141.

[0092] In some examples, a plurality of first engaging members 141 may be arranged on the first engaging surface 142 in a manner surrounding the central axis of the transmission wheel 14. In other words, a plurality of first engaging members 141 may be distributed on a circle centered on the center of the transmission wheel 14 on the first engaging surface 142. In this case, since the first engaging members 141 will rotate with the transmission wheel 14 during rotation, by distributing a plurality of first engaging members 141 on a circle centered on the center of the transmission wheel 14 on the first engaging surface 142, when the transmission wheel 14 stops rotating, the distances of the plurality of first engaging members 141 closest to the second engaging member 151 from the center of rotation are all the same, thereby facilitating engagement between the first engaging surface 142 and the second engaging surface 152. However, the present invention is not limited to this, and the first engaging members 141 may also be arranged on the first engaging surface 142 in a manner not surrounding the central axis of the transmission wheel 14. For example, the first engaging component 141 can also be centrally located in the fan-shaped area of ​​the first engaging surface 142 with the center of the transmission wheel 14 as the center.

[0093] See in some examples Figure 7 At least a portion of the surface of the first engaging arm 1411 near the groove structure C1 can be an arc surface. At least a portion of the surface of the second engaging arm 1412 near the groove structure C1 can also be an arc surface. In this case, when the first engaging member 141 and the second engaging member 151 come into contact, the arc surface guides the convex structure C2 to move to the groove structure C1, which facilitates the engagement of the first engaging member 141 with the second engaging member 151.

[0094] In some examples, the second engaging member 151 can be formed into a raised convex structure C2 in different ways. In some examples, the second engaging member 151 can be any shape, such as a cylinder, cone, ellipsoid, or irregular shape, that is disposed on the second engaging surface 152 and protrudes. This facilitates the formation of the convex structure C2 on the second engaging surface 152. In other examples, the protrusion can also be machined onto the surface of the second engaging member 151 to form the convex structure C2.

[0095] See in some examples Figure 8The fixing structure 15 may have multiple second engaging members 151. These multiple second engaging members 151 may be evenly arranged around the central axis of the fixing structure 15 on the second engaging surface 152. In other words, the second engaging members 151 may be distributed in a circle centered on the center of the fixing structure 15, and the intervals between each second engaging member 151 are the same. In this case, since the rotation angle of the transmission wheel 14 is limited by the second engaging members 151 when the first engaging member 141 engages with the second engaging member 151, i.e., the rotation angle of the probe 12 is limited, by making the second engaging members 151 evenly distributed, the intervals of the rotation angles that the probe 12 can reach are the same, thereby facilitating the even distribution of the rotation angles that the probe 12 can reach within the circumference.

[0096] In other examples, multiple second engaging elements 151 may also be arranged on the second engaging surface 152 in a manner that is unevenly arranged around the central axis of the fixing structure 15.

[0097] In some examples, the number of second clips 151 may not be less than the first preset number. The first preset number may not be less than 18, that is, the number of second clips 151 may not be less than 18. For example, the number of second clips 151 may be 18, 36, 48, 72, or 180. However, this invention is not limited to this, and the number of second clips 151 may be arbitrary. The more second clips 151 there are, the more rotation angles with higher accuracy that the probe 12 can reach, and thus the higher the rotation accuracy of the probe 12.

[0098] In some examples, when the slot structure C1 engages with the convex structure C2, the contact between the first engaging member 141 and the second engaging member 151 can be a line contact or a surface contact. This improves the stability of the engagement of the first engaging member 141 and the second engaging member 151.

[0099] In some examples, see [reference] Figure 5 The transmission system 13 may also include a pre-tensioning mechanism 19.

[0100] In some examples, the preload mechanism 19 can be connected to the positioning wheel 16 (see [reference]). Figure 5 In some examples, the preload mechanism 19 can generate preload torque. Thus, the preload mechanism 19 is able to apply preload torque to the positioning wheel 16.

[0101] In some examples, the tooth surface of the positioning wheel 16 can abut against the tooth surface of the transmission wheel 14. In some examples, the preload mechanism 19 can apply a preload torque to the positioning wheel 16 so that the tooth surface of the positioning wheel 16 abuts against the tooth surface of the transmission wheel 14. In this case, the preload mechanism 19 applies a preload torque to the positioning wheel 16 and generates a preload torque on the positioning wheel 16. Since the preload torque is directional, during rotation, the tooth surface of the positioning wheel 16 always abuts against the tooth surface of the transmission wheel 14 from a single direction under the action of the preload torque, which facilitates the elimination of gaps between the tooth surfaces, while maintaining a certain gap between the tooth surfaces on the other side. This helps to prevent the positioning wheel 16 from jamming the transmission wheel 14. Thus, no matter how the transmission wheel 14 rotates, the positioning wheel 16 can rotate with the transmission wheel 14 without affecting the transmission wheel 14, thereby accurately reflecting the rotation angle of the transmission wheel 14, that is, more accurately reflecting the rotation angle of the probe 12, thereby improving the measurement accuracy.

[0102] In some examples, the toothed surface of the drive wheel 14 that abuts against the positioning wheel 16 is designated as the first toothed surface, and the toothed surface of the positioning wheel 16 that abuts against the drive wheel 14 is designated as the second toothed surface. When the first toothed surface rotates closer to the second toothed surface, since the first and second toothed surfaces are already in contact (i.e., there is no gap between them), the first toothed surface always acts on the second toothed surface during rotation, thus preventing the formation of a gap; that is, the first and second toothed surfaces always abut against each other. When the first toothed surface rotates away from the second toothed surface, the gap between the first and second toothed surfaces gradually increases from 0. This gap provides space for the second toothed surface to rotate toward the first toothed surface, so the second toothed surface begins to rotate under the action of the preload torque. When the drive wheel 14 stops rotating (i.e., the first toothed surface no longer rotates), since the preload torque is always present, regardless of the size of the gap between the first and second toothed surfaces, the second toothed surface will always continue to rotate under the action of the preload torque until it abuts against the first toothed surface again. Therefore, no matter how the transmission wheel 14 rotates, the rotation angle of the positioning wheel 16 always corresponds to the rotation angle of the transmission wheel 14 (or the probe 12), thereby improving the measurement accuracy.

[0103] It should be noted that the first tooth surface can refer to any one or more teeth on the transmission wheel 14 that mesh with the positioning wheel 16. For example, when the number of teeth meshing between the transmission wheel 14 and the positioning wheel 16 is 3, there can be 3 first tooth surfaces, and the same applies to the second tooth surface.

[0104] In some examples, the rotation angle of the positioning wheel 16 corresponding to the rotation angle of the transmission wheel 14 (or probe 12) may mean that since the transmission ratio between the positioning wheel 16 and the transmission wheel 14 is adjusted according to requirements, the rotation angle of the positioning wheel 16 can be determined based on the rotation angle of the transmission wheel 14 and the transmission ratio.

[0105] In some examples, the preload torque generated on the positioning wheel 16 can be the preload torque. The torque generated on the drive wheel 14 by the drive mechanism can be the drive torque. The preload torque can be less than the drive torque. This reduces the obstruction of the positioning wheel 16 to the drive wheel 14.

[0106] In some examples, the preload torque may be no less than a third preset value, which can be the torque required to start the rotation of the positioning wheel 16. In this case, when there is a gap between the tooth surface of the positioning wheel 16 and the tooth surface of the transmission wheel 14, it is convenient to drive the positioning wheel 16 to rotate so that the tooth surfaces abut.

[0107] In some examples, the preload torque may not exceed a fourth preset value, which can be the torque required to start the drive wheel 14 rotating. In this case, when the tooth surface of the positioning wheel 16 abuts against the tooth surface of the drive wheel 14, it helps to prevent the drive wheel 14 from rotating unexpectedly due to excessive preload torque (e.g., the drive wheel 14 being driven by the preload torque). In some examples, the fourth preset value may also be the drive torque.

[0108] In some examples, the preload mechanism 19 may include an elastic element 191 (see [link to example]). Figure 5 The elastic element 191 can generate pressure in the circumferential direction of the positioning wheel 16. This helps the preload mechanism 19 generate preload torque. In some examples, the preload torque can be the pressure generated by the elastic element 191.

[0109] In some examples, the elastic element 191 can be a torsion spring or a coil spring. In this case, since the structure of a torsion spring or a coil spring is relatively simple and easy to miniaturize, it is convenient to simplify the structure of the transmission system 13. Preferably, the elastic element 191 can be a torsion spring. The following description uses a torsion spring as an example of the elastic element 191.

[0110] In some examples, the maximum torsion angle of the torsion spring can be no less than 360 degrees. In this case, during the rotation of the positioning wheel 16, it can help prevent the torsion spring from over-torsional and undergoing plastic deformation, thereby improving the reliability of the transmission system 13.

[0111] In some examples, the rotation angle of the positioning wheel 16 may not exceed 360 degrees. This helps to prevent plastic deformation of the torsion spring.

[0112] In some examples, the torsion direction of the torsion spring during preload is defined as the preload direction, and the torsion angle of the torsion spring is defined as the preload angle. When the rotation direction of the positioning wheel 16 is the same as the preload direction, the maximum torsion angle of the torsion spring can be no less than the sum of the preload angle and the rotation angle of the positioning wheel 16. This helps to prevent plastic deformation of the torsion spring.

[0113] In some examples, when the rotation direction of the positioning wheel 16 is opposite to the preload direction, the preload angle may not be less than the rotation angle of the positioning wheel 16. This helps to prevent the preload mechanism 19 from returning to its original state and ceasing to apply preload torque during the rotation of the positioning wheel 16.

[0114] In some examples, the angle measuring mechanism 17 can be fixedly mounted on the measuring base 11. In some examples, one end of the pre-tensioning mechanism 19 can be connected to the angle measuring mechanism 17, and the other end can be connected to the positioning wheel 16. In other words, the pre-tensioning mechanism 19 can be positioned between the angle measuring mechanism 17 and the positioning wheel 16. In this case, by fixing one end of the pre-tensioning mechanism 19, it is possible to help the pre-tensioning mechanism 19 apply pre-tensioning torque stably.

[0115] See in some examples Figure 5 The positioning wheel 16 may have an assembly structure 161. The pre-tightening mechanism 19 may be fixedly connected to the assembly structure 161.

[0116] See in some examples Figure 5 The assembly structure 161 can be a groove or a through hole. This facilitates the connection of the pre-tightening mechanism 19 to the positioning wheel 16.

[0117] See in some examples Figure 5 The number of assembly structures 161 can be multiple. Multiple assembly structures 161 can be arranged around the center of the positioning wheel 16.

[0118] In some examples, the preload mechanism 19 can be fixed to different assembly structures 161. When the preload mechanism 19 is fixed to different assembly structures 161, the preload torque can be different. This allows for easy adjustment of the preload torque.

[0119] See in some examples Figure 5 Figure 5 The positioning wheel 16 may have a rotating shaft 162. A preload mechanism 19 may be fitted onto the rotating shaft 162. In this case, by fitting the preload mechanism 19 onto the rotating shaft 162 of the positioning wheel 16, the central axis of the preload mechanism 19 can be made to coincide with the central axis of the rotating shaft 162 of the positioning wheel 16 as much as possible. This helps to maintain the direction of the preload torque consistent with the rotation direction of the positioning wheel 16 during its rotation.

[0120] As described above, the positioning wheel 16 can be disposed on the angle measuring mechanism 17. In some examples, the rotation axis 162 of the positioning wheel 16 can be disposed on the angle measuring mechanism 17, and the angle measuring mechanism 17 can measure the rotation angle of the positioning wheel 16 by measuring the rotation angle of the rotation axis 162.

[0121] In this invention, the pre-tightening mechanism 19 applies a pre-tightening torque to the positioning wheel 16, generating a pre-tightening torque on the positioning wheel 16. Since the pre-tightening torque is directional, during rotation, the tooth surface of the positioning wheel 16 always abuts against the tooth surface of the transmission wheel 14 from a single direction under the action of the pre-tightening torque. This facilitates the elimination of gaps between the tooth surfaces, while maintaining a certain gap between the tooth surfaces on the other side, thus helping to prevent the positioning wheel 16 from jamming the transmission wheel 14. Furthermore, since the pre-tightening torque is less than the driving torque, it reduces the obstruction of the positioning wheel 16 to the transmission wheel 14. In summary, regardless of how the transmission wheel 14 rotates, the positioning wheel 16 can rotate with the transmission wheel 14 without affecting it, thereby accurately reflecting the rotation angle of the transmission wheel 14, and thus more accurately reflecting the rotation angle of the probe 12, thereby improving measurement accuracy.

[0122] Although the present invention has been specifically described above in conjunction with the accompanying drawings and examples, it is to be understood that the above description does not limit the present invention in any way. Those skilled in the art can make modifications and variations to the present invention as needed without departing from the essential spirit and scope of the present invention, and all such modifications and variations fall within the scope of the present invention.

Claims

1. A transmission system for a measuring base, which is a transmission system for driving a measuring head disposed on the measuring base to rotate, characterized in that, The device includes a drive wheel, a positioning wheel, and a pre-tightening mechanism. The drive wheel rotates under the action of a drive mechanism. The probe is linked to the drive wheel so that the drive wheel drives the probe to rotate. The positioning wheel meshes with the drive wheel. The pre-tightening mechanism is connected to the positioning wheel and applies a pre-tightening torque to the positioning wheel so that the tooth surface of the positioning wheel abuts against the tooth surface of the drive wheel. The pre-tightening torque generated on the positioning wheel is less than the driving torque generated on the drive wheel by the drive mechanism. The positioning wheel is disposed on an angle measuring mechanism so that the rotation angle of the positioning wheel can be measured by the angle measuring mechanism.

2. The transmission system of the measuring base according to claim 1, characterized in that, The pre-tensioning mechanism includes an elastic element that generates pressure in the circumferential direction of the positioning wheel.

3. The transmission system of the measuring base according to claim 2, characterized in that, The elastic element is a torsion spring or a coil spring.

4. The transmission system of the measuring base according to claim 3, characterized in that, The elastic element is a torsion spring, and the maximum torsion angle of the torsion spring is not less than 360 degrees.

5. The transmission system of the measuring base according to claim 1 or 4, characterized in that, The angle measuring mechanism is fixedly mounted on the measuring base, and one end of the pre-tightening mechanism is connected to the angle measuring mechanism, while the other end is connected to the positioning wheel.

6. The transmission system of the measuring base according to claim 1, characterized in that, The positioning wheel has an assembly structure, and the pre-tightening mechanism is fixedly connected to the assembly structure, which is a groove or a through hole.

7. The transmission system of the measuring base according to claim 6, characterized in that, The number of assembly structures is multiple, and the multiple assembly structures are arranged around the center of the positioning wheel. The pre-tightening mechanism has different pre-tightening torques when it is fixed to different assembly structures.

8. The transmission system of the measuring base according to claim 1, characterized in that, It also includes a fixing structure, wherein the transmission wheel approaches and engages with the fixing structure after it stops rotating.

9. The transmission system of the measuring base according to claim 8, characterized in that, The transmission wheel is provided with a first engaging member, and the fixed structure is provided with a plurality of second engaging members that can engage with the first engaging member. The first engaging member includes a first engaging arm and a second engaging arm. When the transmission wheel is engaged with the fixed structure, the first engaging arm and the second engaging arm engage with the second engaging member at the corresponding position. The back clearance between the driving mechanism and the transmission wheel is not less than a first preset value.

10. The transmission system of the measuring base according to claim 9, characterized in that, The first engaging member forms a concave groove structure, and the second engaging member forms a convex structure. The shape of the groove structure matches the shape of the convex structure. When the transmission wheel approaches the fixed structure, it engages with the fixed structure in such a way that the groove structure engages with the convex structure. At least a portion of the surface of the first engaging arm near the groove structure is an arc surface, and at least a portion of the surface of the second engaging arm near the groove structure is an arc surface.

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