Fast-actuated high-precision displacement measuring device with non-rigid connection

Abstract

This invention discloses a non-rigid connection, fast-drive, high-precision displacement measuring device, comprising a support, a threaded tube, a threaded column, and a measuring anvil. The threaded tube has internal threads that engage with the threaded column's external threads. The support houses a measuring shaft, an elastic element, and a measuring element for measuring the displacement of the measuring shaft. One end of the measuring shaft is a probe, which engages with the measuring anvil. The measuring shaft is connected to the threaded column, which has only axial freedom under the action of a guiding mechanism. The measuring shaft is connected to the support via a linear guide rail. One end of the elastic element is connected to the support, and the other end is connected to the measuring shaft. The elastic element applies a restoring force to the measuring shaft in the direction of the measured point. This invention employs a non-rigid connection between the measuring shaft and the drive structure. The measuring rod is provided with a constant measuring force only by a spring at the same deformation position, improving repeatability accuracy and preventing excessive external forces from affecting the measuring tool's accuracy and damaging the measured workpiece. The use of rotation and actuation allows for rapid size switching, resulting in high measurement efficiency.

Description

Technical Field

[0001] The invention relates to a displacement measuring device, in particular to a fast-driven high-precision displacement measuring device with non-rigid connection. Background Art

[0002] Displacement measuring devices, such as micrometers, can measure lengths with an accuracy of 0.01 mm. Existing micrometers have the following disadvantages:

[0003] 1. Ordinary micrometers use ratchet devices. When the ratchet device is at a constant speed, the force measurement is relatively stable. However, the rotation speed of the ratchet is easily affected by external factors and fluctuates. The resulting measurement force is not stable enough, and large errors will occur when measuring the same part size. Therefore, the measurement repeatability accuracy is low. The lever micrometer has relatively stable force measurement, but it is limited to a very small stroke range. In addition, if the lever micrometer wants to achieve high-precision measurement, it needs to use a standard gauge block for zero adjustment before measurement, that is, relative measurement. The measurement process is more complicated. Ordinary micrometers use absolute measurement, and the measurement process is relatively simple.

[0004] 2. The measuring axis and driving structure of traditional measuring tools are rigidly connected. There must be a gap when the driving part can move. This gap will transfer the external force of the measuring tool to the measuring axis through the rigid connection. Therefore, the measuring rod will be skewed after receiving the lateral force, causing the original parallel accuracy between the measuring rod and the measuring anvil to be lost, resulting in parallelism error, which affects the measurement accuracy. The axial force causes the measuring force to be unstable, which also affects the measurement accuracy.

[0005] 3. Ordinary micrometers use a screw-in structure, which can cause scratches on the surface of the measured part and damage the measured part. In addition, the measuring rod will produce parallelism errors after being subjected to lateral forces, which will affect the measurement accuracy. Since the measuring rod and the threaded tube are threaded, the measuring rod and the threaded tube are fixed to each other when they do not rotate with each other, and there is no axial freedom. During manual operation, if the threaded tube is rotated too fast, the measuring rod probe will collide with the measured part and damage the measured part. The collision also causes micro-deformation on the surface of the measured part, and it is no longer the original size, affecting the measurement accuracy. At the same time, the pressure between the probe and the anvil causes a slight deformation of the bow bracket, which also affects the measurement accuracy. The caliper uses a gear type to overcome the defects of the rotary micrometer, but since the caliper usually uses a gear type, the force on the measuring rod is also not constant, which is prone to repeatability errors.

[0006] 4. In large-scale and large-range measurements, it is necessary to manually rotate the threaded tube continuously to make the probe and the anvil suitable for parts of different sizes and different ranges. The range switching cycle is long, the measurement efficiency is low, and the measurement personnel are time-consuming and laborious to operate. Summary of the invention

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a rapid displacement measuring device with constant measuring force, high measuring efficiency, high measuring accuracy and convenient measuring.

[0008] The objective of the present invention is achieved through the following technical solutions:

[0009] A non-rigidly connected fast-drive high-precision displacement measuring device comprises a bracket, a threaded tube, a threaded column, and a measuring anvil. The threaded tube is provided with an inner thread which cooperates with an outer thread of the threaded column. The bracket is provided with a measuring shaft, an elastic element, and a measuring element for measuring the displacement of the measuring shaft. One end of the measuring shaft is a probe which cooperates with the measuring anvil. The measuring shaft is connected to the threaded column. The threaded column has a degree of freedom only in the axial direction under the action of a guide mechanism. The measuring shaft is connected to the bracket through a linear guide rail. One end of the elastic element is connected to the bracket, and the other end is connected to the measuring shaft. The elastic element applies a restoring force to the measuring shaft in the direction of a measured point.

[0010] Preferably, the measuring axis includes a measuring rod and an anti-rotation rod, the measuring rod is connected to the threaded column through the anti-rotation rod, the anti-rotation rod is connected to the bracket through a linear guide rail, and the non-probe end of the measuring rod is connected to one end of the anti-rotation rod through a non-rigid connection part. After being connected through the non-rigid connection part, the measuring rod and the anti-rotation rod have mutual freedom in both radial and axial directions.

[0011] Preferably, a notch is provided at the connecting end of the measuring rod and the anti-rotation rod, and a protrusion matching the notch is provided at the connecting end of the anti-rotation rod and the measuring rod. The non-rigid connecting part includes the protrusion and the notch. The protrusion includes a connecting part connected to the anti-rotation rod and a clamping part connected to the connecting part. The orthographic projection area of ​​the clamping part is larger than the orthographic projection area of ​​the connecting part. When the geometric centers of the protrusion and the notch coincide, the outer wall of the protrusion does not contact the inner wall of the notch.

[0012] Preferably, the non-rigid connecting portion is made of flexible material.

[0013] Preferably, a No. 1 anti-rotation pin is provided on the bracket, a No. 2 anti-rotation pin is provided on the threaded column, and a sliding groove is provided on the anti-rotation rod along the axial direction of the anti-rotation rod, the No. 1 anti-rotation pin and the No. 2 anti-rotation pin cooperate with the sliding groove, and the axes of the No. 1 anti-rotation pin and the No. 2 anti-rotation pin are both perpendicular to the axis of the anti-rotation rod.

[0014] Preferably, a guide block is fixedly provided inside the bracket, a fixed block is fixedly provided on the measuring shaft, a guide rod is provided on the fixed block, the axis of the guide rod is perpendicular to the axis of the measuring shaft, and a guide groove cooperating with the guide rod is provided on the guide block, and the guide groove is parallel to the axis of the measuring rod.

[0015] Preferably, the elastic element is a tension spring, a tension spring column is provided on the guide block, a pulley is provided in the bracket, the tension spring cooperates with the pulley, one end of the tension spring is fixed on the tension spring column, the other end of the tension spring passes through the pulley and is fixed on the guide rod, one end of the tension spring is connected to the bracket through the tension spring column, and the other end of the tension spring is connected to the measuring axis through the guide rod.

[0016] Preferably, an axial hole is provided on the threaded column, and the non-probe end of the measuring shaft cooperates with and passes through the axial hole. A limiting portion is provided on the non-probe end of the measuring shaft, and the cross-sectional area of ​​the limiting portion is larger than the cross-sectional area of ​​the axial hole. The limiting portion is used to prevent the measuring shaft from escaping from the axial hole at one end toward the measured point, but can move freely in the axial direction away from the measured point.

[0017] Preferably, the measuring element is a coding grating, which includes a fixed grating that is relatively stationary with the bracket and a moving grating that moves synchronously with the measuring axis.

[0018] Preferably, the bracket is provided with a coaxial shaft cover and an anti-rotation sleeve, one end of the shaft cover is threadedly connected to the bracket, and the other end of the shaft cover is threadedly connected to the anti-rotation sleeve, the anti-rotation rod is arranged inside the shaft cover and the anti-rotation sleeve, the shaft cover and the anti-rotation sleeve are arranged inside the threaded tube, a No. 1 limit block is arranged on the inner wall of the threaded tube, and a No. 2 limit block cooperating with the No. 1 limit block is arranged on the outer wall of the anti-rotation sleeve, and a wrench seat is also provided on the bracket, and a wrench is hingedly provided on the wrench seat, the wrench cooperates with the edge of the threaded tube, and the wrench is used to push the threaded tube to move in a direction away from the bracket.

[0019] The beneficial effects of the present invention are:

[0020] (1) One end of the tension spring is connected to the bracket, and the other end is connected to the measuring rod. The tension spring provides the only restoring force for the measuring rod. According to Hooke's law, the tension applied to the measuring rod at any same moving position is a constant value. Therefore, the measuring force applied to the measuring rod is constant, and the repeatability accuracy of the measuring tool is significantly improved.

[0021] (2) One end of the anti-rotation rod is non-rigidly connected to the measuring rod, and the other end is non-rigidly connected to the threaded column, so as to avoid external force on the measuring rod caused by human drive. The anti-rotation rod is only driven by the threaded tube to provide axial unidirectional driving force for the measuring rod. This unidirectional driving force does not affect the measuring force at all times, thereby improving the measurement accuracy.

[0022] (3) The threaded tube and the threaded column use self-locking threads to drive the anti-rotation rod to provide rapid displacement drive for the measuring rod, and can be self-locked at any position of the stroke. The wrench and the threaded tube are non-rigidly connected. The wrench drives the threaded tube to move axially and drives the anti-rotation rod to provide a fixed small stroke rapid drive in the self-locking position, thereby improving the measurement efficiency of batch measurement.

[0023] (4) It combines the advantages of absolute measurement of ordinary micrometers, the advantages of lever micrometers that can adapt to the size of the measured parts, and the advantages of calipers that can move in and out directly. It avoids the problem of measurement error caused by the rigid connection of the measuring rod with the ratchet of the traditional micrometer, the manual driving of the ratchet, and the unstable axial measuring force. It also avoids the problem that the lever micrometer can only measure constant force at a very small stroke and needs to calibrate the zero position. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the matching structure of the notch and the protrusion;

[0026] Figure 3 It is a schematic diagram of the structure of the measuring rod, the fixed block and the guide block;

[0027] Figure 4 It is a schematic diagram of the internal structure of the threaded pipe;

[0028] Figure 5 It is a schematic diagram of the matching structure of the wrench and the threaded pipe;

[0029] In the figure, 1- bracket, 2- anvil, 3- bowl-shaped rubber, 4- fixed sleeve, 5- measuring rod, 6- fixed grid, 7- tension spring, 8- moving grid, 9- guide rod, 10- tail end sleeve, 11- shaft cover, 12- anti-rotation rod, 13- anti-rotation sleeve, 14- No. 1 anti-rotation pin, 15- threaded column, 16- screw, 17- end cover, 18- threaded tube, 19- No. 2 anti-rotation pin, 20- wrench, 21- wrench shaft, 22- wrench seat, 23- guide block, 24- tension spring column, 25- battery, 26- pulley, 27- notch, 28- protrusion, 29- connecting part, 30- clamping part, 31- fixed block, 32- gasket, 33- No. 1 limit block. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-5 , the present invention provides a technical solution:

[0032] A fast-drive high-precision displacement measuring device with non-rigid connection comprises a bracket 1, a threaded tube 18, a threaded column 15, and a measuring anvil 2. The bracket 1 is provided with a measuring shaft, an elastic element, and a measuring element for measuring the displacement of the measuring shaft. The threaded tube 18 is provided with a thread that matches the threaded column 15. The bracket 1 is provided with a coaxial shaft cover 11 and an anti-rotation sleeve 13. One end of the shaft cover 11 is threadedly connected to the bracket 1, and the other end of the shaft cover 11 is threadedly connected to the anti-rotation sleeve 13. The anti-rotation rod 12 is provided inside the shaft cover 11 and the anti-rotation sleeve 13. The shaft cover 11 and the anti-rotation sleeve 13 are provided inside the threaded tube 18.

[0033] Among them, one end of the measuring shaft is a measuring head, and the measuring head cooperates with the measuring anvil 2. The measuring anvil 2 is used to fix the measuring end during measurement and provide a zero position reference for detection. The measuring shaft is connected to the threaded column 15. The threaded column 15 has only axial freedom under the action of the guide mechanism and can only provide axial unidirectional driving force for the measuring shaft. The measuring shaft is connected to the bracket 1 through a linear guide rail. One end of the elastic element is connected to the bracket 1, and the other end is connected to the measuring shaft. The elastic element applies a restoring force to the measuring shaft in the direction of the measured point.

[0034] Furthermore, the measuring axis includes a measuring rod 5 and an anti-rotation rod 12, the measuring rod 5 is connected to the threaded column 15 through the anti-rotation rod 12, the anti-rotation rod 12 is connected to the bracket 1 through a linear guide rail, and the non-probe end of the measuring rod 5 is connected to one end of the anti-rotation rod 12 through a non-rigid connection part. After being connected through the non-rigid connection part, the measuring rod 5 and the anti-rotation rod 12 have mutual freedom in both radial and axial directions.

[0035] The threaded column 15 is provided with an axial hole, and the non-probe end of the measuring shaft (here, the end of the anti-rotation rod 12 away from the measuring rod 5) cooperates with the axial hole and passes through the axial hole. The non-probe end of the measuring shaft (here, the end of the anti-rotation rod 12 away from the measuring rod 5) is provided with a limiter, and the cross-sectional area of ​​the limiter is larger than the cross-sectional area of ​​the axial hole. The limiter is used to prevent the measuring shaft from escaping from the axial hole at one end toward the measured point, but has a degree of freedom in the axial direction away from the measured point. Specifically, the end of the anti-rotation rod 12 away from the non-rigid connection part is provided with a screw 16 through a threaded connection, and the screw 16 is coaxial with the anti-rotation rod 12. A gasket 32 ​​is provided between the screw 16 and the anti-rotation rod 12, and the limiter is the gasket 32. The gasket 32 ​​cooperates with the end face of the threaded column 15.

[0036] A fixed shaft sleeve 4 and a tail end shaft sleeve 10 are provided in the bracket 1, which cooperate with the measuring rod 5, provide a mobile guide and support for the measuring rod 5. A bowl-shaped rubber 3 is provided on the fixed shaft sleeve 4, which provides good sealing for the entire measuring device, and is waterproof and dustproof. The fixed shaft sleeve 4 can adopt a dense ball bearing, which is tightly matched with the measuring rod 5 without any gap, thereby preventing the measuring rod 5 from tilting or swinging slightly, thereby improving the measurement accuracy. At the same time, the dense ball bearing has a long service life.

[0037] Furthermore, the non-rigid connecting portion can be made of a flexible material, such as a rope, a belt, a flexible plastic product, etc., or a notch 27 is provided at the connecting end of the measuring rod 5 and the anti-rotation rod 12, and a protrusion 28 cooperating with the notch 27 is provided at the connecting end of the anti-rotation rod 12 and the measuring rod 5. The non-rigid connecting portion includes the protrusion 28 and the notch 27, and the protrusion 28 includes a connecting portion 29 connected to the anti-rotation rod 12 and a clamping portion 30 connected to the connecting portion 29. The orthographic projection area of ​​the clamping portion 30 is larger than the orthographic projection area of ​​the connecting portion 29, so as to ensure that when the clamping portion 30 cannot escape from the notch 27 and the geometric centers of the protrusion 28 and the notch 27 coincide, the outer wall of the protrusion 28 does not contact the inner wall of the notch 27, so as to ensure that within a certain range, the measuring rod 5 and the anti-rotation rod 12 have mutual freedom in both radial and axial directions (this embodiment adopts a T-shaped notch and a T-shaped protrusion).

[0038] The measuring rod 5 and the anti-rotation rod 12 are connected to the bracket 1 through a linear guide rail, which replaces the traditional rotating in and out method and adopts a straight in and out method to improve the parallel accuracy. Among them, the bracket 1 is fixedly provided with a guide block 23, the measuring rod 5 is fixedly provided with a fixed block 31, the fixed block 31 is provided with a guide rod 9, the axis of the guide rod 9 is perpendicular to the axis of the measuring rod 5, the guide block 23 is provided with a guide groove that cooperates with the guide rod 9, and the guide groove is parallel to the axis of the measuring rod 5. The bracket 1 is provided with a No. 1 anti-rotation pin 14, further, the No. 1 anti-rotation pin 14 is fixed on the anti-rotation sleeve 13, the threaded column 15 is provided with a No. 2 anti-rotation pin 19, and a slide groove is provided on the anti-rotation rod 12 along the axis direction of the anti-rotation rod 12, the No. 1 anti-rotation pin 14 and the No. 2 anti-rotation pin 19 cooperate with the slide groove, and the axes of the No. 1 anti-rotation pin 14 and the No. 2 anti-rotation pin 19 are both perpendicular to the axis of the anti-rotation rod 12. The No. 1 anti-rotation pin 14 is inserted into the slide groove of the anti-rotation rod 12 to limit the rotation of the anti-rotation rod 12, ensuring that the anti-rotation rod 12 can only move axially. The No. 2 anti-rotation pin 19 is inserted into the slide groove of the anti-rotation rod 12 whose rotation is restricted, and then connected to the threaded column 15 to limit the rotation of the threaded column 15 to ensure that the threaded column 15 can only move axially. It adopts a straight-in structure and has the characteristics of fast and efficient straight-in measuring tools. At the same time, it has the characteristic of no mutual friction after contacting the workpiece during measurement, thereby protecting the measuring surface and the measured workpiece.

[0039] Further, one end of the elastic element is connected to the bracket 1, and the other end is connected to the measuring rod 5, and the elastic element applies a restoring force to the measuring rod 5 in a direction away from the anti-rotation rod 12. Further, the elastic element is a tension spring 7, a tension spring column 24 is provided on the guide block 23, a pulley 26 is provided in the bracket 1, the tension spring 7 cooperates with the pulley 26, one end of the tension spring 7 is fixed on the tension spring column 24, and the other end of the tension spring 7 is fixed on the guide rod 9 after passing through the pulley 26, one end of the tension spring 7 is connected to the bracket 1 through the tension spring column 24, and the other end of the tension spring 7 is connected to the measuring rod 5 through the guide rod 9. Since the internal space of the bracket 1 is small, the length of the tension spring 7 is lengthened by means of the pulley 26 (if the length of the tension spring 7 is short, when the moving distance of the measuring rod 5 exceeds the limit deformation of the tension spring 7, the elastic coefficient of the tension spring 7 changes, and then the tension of the tension spring 7 on the measuring rod 5 becomes unstable, and the measuring head of the measuring rod 5 cannot cooperate well with the measured part, affecting the measurement effect), providing a stable tension for the measuring rod 5.

[0040] Further, the measuring element is a coding grating, the battery 25 provides power support for the coding grating, the coding grating includes a fixed grating 6 relatively stationary with the bracket 1 and a moving grating 8 synchronously moving with the measuring axis, the displacement generated when the measuring rod 5 moves is the displacement between the fixed grating 6 and the moving grating 8, and the displacement generated when the measuring rod 5 moves is measured by the displacement between the fixed grating 6 and the moving grating 8. The electronic measurement method is used to facilitate rapid measurement and improve measurement efficiency. Further, the fixed grating 6 is fixed on the inner wall of the bracket 1, and the moving grating 8 is arranged on the fixed block 31.

[0041] A No. 1 limit block 33 is disposed on the inner wall of the threaded tube 18, and a No. 2 limit block 34 cooperating with the No. 1 limit block 33 is disposed on the outer wall of the anti-rotation sleeve 13. The No. 1 limit block 33 and the No. 2 limit block 34 are used to prevent the threaded tube 18 from detaching from the bracket 1, that is, to prevent the measuring rod 5 from excessively displacing and causing the moving fence 8 to exceed the stroke and be damaged. A wrench seat 22 is also disposed on the bracket 1, and a wrench 20 is hingedly disposed on the wrench seat 22 through a wrench shaft 21. The wrench 20 cooperates with the edge of the threaded tube 18, and the wrench 20 is used to push the threaded tube 18 to move in a direction away from the bracket 1. At the same time, the longest displacement of the threaded tube 18 pushed by the wrench 20 is the distance between the No. 1 limit block 33 and the No. 2 limit block 34. Figure 5 As shown, since the wrench 20 is hinged to move in an arc, considering that if only the end of the wrench 20 is matched with the edge of the threaded tube 18, when the arc displacement is large and the length of the wrench 20 is limited, the wrench 20 may be separated from the edge of the threaded tube 18, the wrench 20 is designed as shown. Figure 5The semicircular shape increases the contact area between the wrench 20 and the threaded tube 18 to prevent the above situation. The contact surface between the wrench 20 and the threaded tube 18 is set to an arc shape, so that the contact point trajectory of the wrench 20 and the threaded tube 18 adapts to the movement trajectory of the wrench 20, so that the contact between the wrench 20 and the threaded tube 18 is smoother, preventing jamming and scratching, which is ergonomic and comfortable to operate.

[0042] An end face cover 17 is provided at the end of the threaded tube 18 for sealing the bracket 1 and limiting the displacement of the measuring rod 5 to prevent the moving grid 8 from exceeding the stroke and being damaged.

[0043] The use process and principle of the present invention are as follows (with Figure 1 For example):

[0044] In the non-measuring state (when pre-adjusting the static position and stretching the measuring rod 5), the gasket 32 ​​keeps in contact with the end face of the threaded column 15, and at the same time provides a reaction force to overcome the tension of the tension spring 7 and the combined force of the gravity of the measuring rod 5, so as to achieve static balance or dynamic balance. In the measuring state (the measuring end of the measuring rod 5 and the measuring anvil 2 first contact the measured object at the same time, or the measuring end and the measuring anvil 2 are directly in contact at zero position), the threaded column 15 moves toward the measured object, causing the end face of the threaded column 15 to separate from the end face gasket 32. The measuring rod 5 is only subjected to the tension of the spring and the reaction force provided by the measured object in the axial direction, and is not affected by other forces. Therefore, at any same measuring position, the measuring force is constant.

[0045] During measurement, the threaded tube 18 is rotated by estimating the approximate length of the part to be measured. Since the No. 1 anti-rotation pin 14 is fixed on the anti-rotation sleeve 13, that is, fixed relative to the bracket 1, and the No. 2 anti-rotation pin 19 is arranged on the threaded column 15, that is, fixed relative to the threaded column 15, and the No. 1 anti-rotation pin 14 and the No. 2 anti-rotation pin 19 are both restricted by the slide groove on the anti-rotation rod 12, when the threaded tube 18 is rotated, the threaded column 15 will move forward relative to the threaded tube 18, even if the measuring rod 5 is away from the measuring anvil 2, and when the wrench 20 is turned, the threaded column 15 will move forward relative to the threaded tube 18. The threaded column 15 and the threaded tube 18 are fixed by threads, and the anti-rotation rod 12 together with the measuring rod 5 continue to move away from the measuring anvil 2 through the limiting part. In the large-scale inspection of parts with similar sizes, the threaded tube 18 is rotated in advance so that the distance between the measuring rod 5 and the measuring anvil 2 is roughly suitable for the measured parts, and it is self-locked in this position. In the subsequent measurement, it is only necessary to pull the wrench 20 (when the wrench 20 is not provided, the threaded tube 18 can also be directly pulled outward) to make a slight adjustment to the measuring rod 5 so that the measuring rod 5 finally matches the part size. This makes it convenient for measurement personnel to quickly change the measuring tool to any position in a large range, meets the need for fast switching of sizes, eliminates the trouble of manually rotating the threaded tube to make the probe and the anvil 2 cooperate, and greatly improves the measurement efficiency. The threaded column 15 that is restricted from rotation cooperates with the threaded tube 18 with a large-diameter self-locking thread. The rotation of the threaded tube 18 provides full-stroke rapid axial drive for the threaded column 15, and can self-lock at any position of the stroke, which can be applied to rapid detection of different sizes. The wrench 20 is non-rigidly connected to the threaded tube 18 to drive the threaded tube 18 to move axially and drive the anti-rotation rod 12 to provide rapid drive within a fixed stroke (the stroke distance is the distance between the No. 1 limit block 33 and the No. 2 limit block 34) in the self-locking position, which can be applied to rapid batch detection.

[0046] When the threaded tube 18 is rotated, since the threaded column 15 only cooperates with the anti-rotation rod 12, the lateral force generated during the rotation will only affect the anti-rotation rod 12. Since the anti-rotation rod 12 and the measuring rod 5 are connected by a non-rigid connection part, the lateral force will not be transmitted to the measuring rod 5. The measuring rod 5 is only subjected to the tension of the tension spring 7. When the probe and the anvil 2 cooperate well and contact the part to be measured at the same time, the threaded column 15 continues to move toward the measured part, and the end face of the threaded column 15 and the gasket 32 ​​will be separated or in a balanced state of contact but no force applied to each other. The external force will not be transmitted to the measuring rod 5 and the workpiece. The measuring rod 5 is axially subjected to the tension of the spring and the reaction force provided by the measured part, and is not affected by other forces. The measuring rod 5 is always provided with a constant measuring force by the tension spring 7 at the same deformation position (according to Hooke's law F=kx, x is the same at the same position, and F is constant when k remains unchanged), which significantly improves the repeatability accuracy of the measuring tool.

[0047] Since the anti-rotation rod 12 cooperates with the axial hole of the threaded column 15, the measuring rod 5 is not fixed to the threaded tube 18 like a traditional micrometer, thus avoiding the situation where the measuring rod 5 probe causes micro-deformation on the surface of the part to be measured (the measuring rod 5 has axial freedom and can adapt to the size of the part to be measured).

[0048] Therefore, during measurement, the displacement of the measuring rod 5 is completely equal to the size of the measured part and is not affected by other factors. The specific value is measured through the relative displacement of the fixed grid 6 and the moving grid 8.

[0049] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A non-rigidly connected fast-actuated high-precision displacement measuring device, comprising a bracket (1), Features: It also comprises a threaded tube (18), a threaded column (15), and a measuring anvil (2); the threaded tube (18) is provided with an internal thread which cooperates with an external thread of the threaded column (15); the bracket (1) is provided with a measuring shaft, an elastic element, and a measuring element for measuring the displacement of the measuring shaft; one end of the measuring shaft is a measuring head, the measuring head cooperates with the measuring anvil (2); the measuring shaft is connected to the threaded column (15); the threaded column (15) has a degree of freedom only in the axial direction under the action of a guide mechanism; the measuring shaft is connected to the bracket (1) via a linear guide rail; one end of the elastic element is connected to the bracket (1), and the other end is connected to the measuring shaft; the elastic element applies a restoring force to the measuring shaft in the direction of the measured point; The measuring axis comprises a measuring rod (5) and an anti-rotation rod (12), the measuring rod (5) being connected to the threaded column (15) via the anti-rotation rod (12), the anti-rotation rod (12) being connected to the bracket (1) via a linear guide rail, the non-probe end of the measuring rod (5) being connected to one end of the anti-rotation rod (12) via a non-rigid connection portion, and after being connected via the non-rigid connection portion, the measuring rod (5) and the anti-rotation rod (12) have mutual degrees of freedom in both radial and axial directions; The threaded column (15) is provided with an axial hole, the non-probe end of the measuring shaft cooperates with the axial hole and passes through the axial hole, the non-probe end of the measuring shaft is provided with a limit portion, the cross-sectional area of ​​the limit portion is larger than the cross-sectional area of ​​the axial hole, the limit portion is used to prevent the measuring shaft from escaping from the axial hole at one end toward the measured point, but can freely move in an axial direction away from the measured point; A screw (16) is provided at one end of the anti-rotation rod (12) away from the non-rigid connection portion through a threaded connection. The screw (16) is coaxial with the anti-rotation rod (12). A gasket (32) is provided between the screw (16) and the anti-rotation rod (12). The limiting portion is the gasket (32). The gasket (32) cooperates with the end surface of the threaded column (15). In the non-measuring state, the gasket (32) maintains contact with the end face of the threaded column (15); in the measuring state, the threaded column (15) moves toward the measured object, causing the end face of the threaded column (15) to separate from the end face gasket (32).

2. The non-rigidly connected fast-drive high-precision displacement measuring device according to claim 1, Features: A notch (27) is provided at the connecting end of the measuring rod (5) and the anti-rotation rod (12); a convex block (28) matching the notch (27) is provided at the connecting end of the anti-rotation rod (12) and the measuring rod (5); the non-rigid connecting portion comprises the convex block (28) and the notch (27); the convex block (28) comprises a connecting portion (29) connected to the anti-rotation rod (12) and a clamping portion (30) connected to the connecting portion (29); the orthographic projection area of ​​the clamping portion (30) is larger than the orthographic projection area of ​​the connecting portion (29); when the geometric centers of the convex block (28) and the notch (27) coincide, the outer wall of the convex block (28) and the inner wall of the notch (27) do not contact each other.

3. The non-rigidly connected fast-drive high-precision displacement measuring device according to claim 2, Features: The non-rigid connecting part is made of flexible material.

4. The non-rigidly connected fast-drive high-precision displacement measuring device according to claim 2, Features: The bracket (1) is provided with a No. 1 anti-rotation pin (14), the threaded column (15) is provided with a No. 2 anti-rotation pin (19), and a slide groove is provided on the anti-rotation rod (12) along the axis direction of the anti-rotation rod (12), the No. 1 anti-rotation pin (14) and the No. 2 anti-rotation pin (19) cooperate with the slide groove, and the axes of the No. 1 anti-rotation pin (14) and the No. 2 anti-rotation pin (19) are perpendicular to the axis of the anti-rotation rod (12).

5. The non-rigidly connected fast-drive high-precision displacement measuring device according to claim 1, Features: A guide block (23) is fixedly arranged inside the bracket (1), a fixed block (31) is fixedly arranged on the measuring shaft, a guide rod (9) is arranged on the fixed block (31), the axis of the guide rod (9) is perpendicular to the axis of the measuring shaft, and a guide groove cooperating with the guide rod (9) is arranged on the guide block (23), and the guide groove is parallel to the axis of the measuring rod (5).

6. The non-rigidly connected fast-drive high-precision displacement measuring device according to claim 5, Features: The elastic element is a tension spring (7), a tension spring column (24) is provided on the guide block (23), a pulley (26) is provided in the bracket (1), the tension spring (7) cooperates with the pulley (26), one end of the tension spring (7) is fixed on the tension spring column (24), the other end of the tension spring (7) passes through the pulley (26) and is fixed on the guide rod (9), one end of the tension spring (7) is connected to the bracket (1) through the tension spring column (24), and the other end of the tension spring (7) is connected to the measuring axis through the guide rod (9).

7. The non-rigidly connected fast-drive high-precision displacement measuring device according to claim 1, Features: The measuring element is a coding grating, which comprises a fixed grating (6) which is relatively stationary with the support (1) and a moving grating (8) which moves synchronously with the measuring axis.

8. The non-rigidly connected fast-drive high-precision displacement measuring device according to claim 1, Features: The bracket (1) is provided with a coaxial shaft cover (11) and an anti-rotation sleeve (13); one end of the shaft cover (11) is threadedly connected to the bracket (1); the other end of the shaft cover (11) is threadedly connected to the anti-rotation sleeve (13); the anti-rotation rod (12) is arranged inside the shaft cover (11) and the anti-rotation sleeve (13); the shaft cover (11) and the anti-rotation sleeve (13) are arranged inside the threaded tube (18); a first limit block (33) is arranged on the inner wall of the threaded tube (18); a second limit block (34) cooperating with the first limit block (33) is arranged on the outer wall of the anti-rotation sleeve (13); a wrench seat (22) is further provided on the bracket (1); a wrench (20) is hingedly provided on the wrench seat (22); the wrench (20) is cooperating with the edge of the threaded tube (18); the wrench (20) is used to push the threaded tube (18) to move in a direction away from the bracket (1).

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