Probe limiting seat and profile measuring instrument

Abstract

A probe limiting seat and a contour measuring instrument relate to the technical field of contour detecting instruments, the probe limiting seat comprises a seat body, the seat body is provided with a fixing structure, and the fixing structure is used for fixing the seat body on a probe of the contour measuring instrument; the seat body has a limiting direction, and the limiting direction is parallel to the axial direction of the contact pin when the probe limiting seat is used; the base body is provided with a limiting end located at the end of the limiting direction, the tip of the contact pin extends out through the limiting end, and the limiting end is used for being supported on the surface of an object to be detected so as to limit the downward probing depth of the tip of the contact pin in a recess in the surface of the object to be detected. The probe limiting seat can be additionally arranged on the contour measuring instrument to protect the contact probe, so that the problem that the contact probe is easy to sink into a pit to be damaged when the contour measuring instrument is used for detecting samples with pits on the surfaces is solved.

Description

Technical Field

[0001] The present application relates to the technical field of contour detection instruments, and in particular to a stylus limit seat and a contour measuring instrument. Background Art

[0002] The profile measuring instrument can be used to measure the profile of the sample (such as threads, arc surfaces and spherical surfaces, special-shaped curved surfaces, etc.). The profile measuring instrument generally includes: a stylus (measurement needle), a stylus mounting rod for mounting the stylus, a driving mechanism for driving the stylus mounting rod to move horizontally, and a sensor for measuring the swing amplitude of the stylus mounting rod. During measurement, the stylus contacts the surface of the sample, and the driving mechanism drives the stylus mounting rod to move horizontally. The stylus moves up and down following the surface morphology of the workpiece, thereby driving the stylus mounting rod to swing. The sensor measures the swing amplitude of the stylus mounting rod, and can subsequently restore the surface morphology of the sample based on the swing of the stylus mounting rod.

[0003] Since some samples may have pits on their surfaces, if the pits are too deep, the stylus will be difficult to get out after being stuck in the deep pits. As the stylus mounting rod continuously drives the stylus to move horizontally, the stylus may be easily damaged due to excessive force. Utility Model Content

[0004] The present application provides a stylus limit seat and a contour measuring instrument, so as to improve the problem that when the contour measuring instrument detects some samples with pits on the surface, the stylus is easily sunk into the pits and damaged.

[0005] According to the first aspect, an embodiment provides a probe limit seat, comprising:

[0006] A seat body, wherein a fixing structure is provided on the seat body, and the fixing structure is used to fix the seat body on the measuring needle of the contour measuring instrument;

[0007] The seat body has a limiting direction, which is a direction parallel to the axial direction of the stylus when the stylus limiting seat is in use; the seat body has a limiting end located at the end of the limiting direction, the limiting end is for the tip of the stylus to extend, and the limiting end is used to support on the surface of the object to be measured to limit the depth of the stylus tip in the depression on the surface of the object to be measured.

[0008] In one embodiment, the fixing structure includes a rod positioning cavity and an abutment surface provided on the seat body; the rod positioning cavity is for the stylus mounting rod of the contour measuring instrument to enter, and positions the seat body on the stylus mounting rod along the axial direction of the stylus; the abutment surface is used to abut against the outer surface of the stylus to limit the axial rotation of the seat body around the stylus mounting rod.

[0009] In one embodiment, the rod body positioning cavity has an insertion port for the contact pin mounting rod to be inserted axially, and the insertion port is located on the end surface of the seat body.

[0010] In one embodiment, the rod body positioning cavity is formed by a through hole or a blind hole provided on the seat body.

[0011] In one embodiment, a through groove is provided on the seat body, and the through groove is located on one side of the circumference corresponding to the rod body positioning cavity. The through groove extends along the axial direction of the rod body positioning cavity and is connected with the rod body positioning cavity.

[0012] In one embodiment, the seat body includes a first part and a second part, the first part and the second part form a step structure, and the step structure forms an accommodating space for accommodating the contact pin; the abutting surface is arranged on the second part.

[0013] In one embodiment, the abutting surface has a recessed portion, and the recessed portion is used to partially accommodate the contact pin.

[0014] In one embodiment, the cross section of the recess is arc-shaped.

[0015] In one embodiment, the rod body positioning cavity is located in the middle of the seat body along the limiting direction, and two abutting surfaces are provided, and the two abutting surfaces are located on both sides of the rod body positioning cavity along the limiting direction.

[0016] According to the second aspect, an embodiment provides a contour measuring instrument, comprising a main body, a stylus mounting rod and a stylus mounted at an end of the stylus mounting rod away from the main body, the main body is provided with a driving mechanism, the stylus mounting rod is mounted on the driving mechanism, the driving mechanism is used to drive the stylus mounting rod and the stylus to move; and also includes a stylus limit seat, the stylus limit seat is the stylus limit seat described in any of the above embodiments.

[0017] According to the stylus limit seat of the above-mentioned embodiment, it includes a seat body and a fixing structure arranged on the seat body. The seat body can be fixed on the stylus of the contour measuring instrument through the fixing structure. The seat body has a limiting end. During the detection process, when the stylus enters a pit with a depth exceeding the depth from which it can escape by itself, the limiting end can be supported on the surface of the object to be measured to limit the depth of the needle tip in the depression on the surface of the object to be measured, so that the depth of the stylus does not exceed the depth from which the stylus can escape by itself, thereby enabling the stylus to escape from the pit by itself during the process of being driven to move and continue the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a measuring needle limit seat in an embodiment;

[0019] Figure 2A side view of a measuring needle limit seat in one embodiment;

[0020] Figure 3 A schematic diagram of a detection process using a probe limit seat for detection in an embodiment;

[0021] Figure 4 It is a schematic diagram of the structure of a measuring needle limit seat in another embodiment;

[0022] Figure 5 A schematic diagram of the structure of a profile tester in an embodiment;

[0023] Figure 6 for Figure 5 Enlarged schematic diagram of part A.

[0024] In the figure, 100, the measuring needle limit seat; 110, the seat body; 111, the limit end; 112, the first part; 113, the second part; 120, the fixing structure; 121, the rod body positioning cavity; 1211, the plug interface; 122, the abutment surface; 1221, the recess; 123, the through groove;

[0025] 200, main machine; 210, driving mechanism;

[0026] 300, stylus mounting rod;

[0027] 400. Stylus. DETAILED DESCRIPTION

[0028] The present application is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are intended to enable the present application to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0029] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0030] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0031] The profile measuring instrument can measure the profile of samples with profiles such as threads, arc surfaces, spherical surfaces, and special-shaped curved surfaces. However, the surface of samples such as screws and gears has pits. Since the tip of the stylus is a cone, for pits with a small depth, the stylus can escape along the sample surface with the help of the cone. However, if the pit is too deep, it will be difficult for the stylus to escape after being stuck in the pit. During the profile measurement process, the stylus mounting rod of the profile measuring instrument will continuously drive the stylus to move horizontally. The stylus that is stuck in the pit and cannot escape will be damaged due to excessive force.

[0032] In order to improve this problem, some contour measuring instruments will design motion control methods in advance. In some measurement scenarios where the surface contour of the sample is more important than the pit contour and the measurement process is expected to be continuous, the designed motion control methods are applied to prevent the stylus from sinking into a pit that is too deep, thereby reducing the occurrence of the stylus being damaged by sinking into the pit. A limit mechanism can also be set in the contour measuring instrument, for example, the stylus mounting rod is passed through a limit hole, and the swing range of the stylus mounting rod is limited by the limit hole. However, the above scheme requires the contour measuring instrument to be designed in advance. In addition, for the improvement scheme of setting a limit mechanism, after the limit mechanism is set, it is usually impossible to adjust the limit range or remove the limit function, which limits the use scenario of the contour measuring instrument and is relatively inconvenient.

[0033] The present application embodiment provides a probe limit seat, referring to Figures 1 to 4 The stylus limit seat 100 includes a seat body 110, on which a fixing structure 120 is provided, and the fixing structure 120 is used to fix the seat body 110 on the stylus 300 of the contour measuring instrument; the seat body 110 has a limiting direction, and the limiting direction is a direction parallel to the axial direction of the stylus 400 when the stylus limit seat 100 is in use; the seat body 110 has a limiting end 111 located at the end of the limiting direction, and the limiting end 111 is for the tip of the stylus 400 to extend out, and the limiting end 111 is used to support the surface of the object to be measured to limit the depth of the tip of the stylus 400 in the depression on the surface of the object to be measured.

[0034] The stylus 300 referred to in the present application refers to a structural member having a stylus 400 . Exemplarily, the stylus 300 includes a stylus mounting rod 300 and a stylus 400 mounted on the stylus mounting rod 300 .

[0035] The distance from the limit end 111 of the stylus limit seat 100 to the tip of the stylus 400 is defined as h (refer to Figure 2), then h can be expressed as a limited distance. When the depth of the pit is greater than the limited distance h, the stylus 400 will pass over the contour of the pit that is lower than h. Thus, the stylus limiter 100 can pass over the deeper pit to maintain the continuous scanning of the profilometer. In actual settings, h should not be greater than the maximum depth of the pit from which the stylus 400 can escape by itself.

[0036] During the detection process, when the stylus 400 measures the flat area on the sample surface or some pit areas with a depth not greater than h, the limit end 111 is separated from the surface of the object to be measured, and the stylus 400 can measure normally; when the stylus 400 enters a pit with a depth exceeding h, the limit end 111 can be supported on the surface of the object to be measured to limit the depth of the tip of the stylus 400 in the depression on the surface of the object to be measured, so that the depth of the stylus 400 does not exceed h. As the stylus 400 is driven to move horizontally, the stylus 400 can automatically escape from the pit and continue the detection.

[0037] The stylus limit seat 100 provided in the present application can be loaded and unloaded at any time according to the detection needs, without adjusting or designing the original measurement structure, and due to the simple structure, it is low-cost to implement, which is helpful for actual detection applications.

[0038] In one embodiment, referring to Figure 1 and Figure 2 The fixed structure 120 includes a rod body positioning cavity 121 and an abutment surface 122 provided on the seat body 110; the rod body positioning cavity 121 is for the stylus mounting rod 300 of the contour measuring instrument to enter, and positions the seat body 110 on the stylus mounting rod 300 along the axial direction of the stylus 400; the abutment surface 122 is used to abut against the outer surface of the stylus 400 to limit the axial rotation of the seat body 110 around the stylus mounting rod 300. The coordinated arrangement of the rod body positioning cavity 121 and the abutment surface 122 not only realizes the installation of the seat body 110, but also makes the seat body 110 less likely to deflect during the detection process, which helps to improve the installation stability and the limit accuracy. The stylus mounting rod 300 referred to in the embodiment of the present application refers to a structural member for the stylus 400 to be directly or indirectly installed. In different examples, the stylus mounting rod 300 can be a measuring rod, or a measuring rod for the measuring rod to be installed.

[0039] In one embodiment, referring to Figure 1 and Figure 3 The rod body positioning cavity 121 has an insertion port 1211 for the stylus mounting rod 300 to be inserted axially, and the insertion port 1211 is located on the end surface of the seat body 110 .

[0040] In one embodiment, referring to Figure 1 and Figure 3The rod body positioning cavity 121 is formed by a through hole provided on the seat body 110. In this way, the seat body 110 can be sleeved and installed at any position on the stylus mounting rod 300, which helps to adjust the installation position as needed.

[0041] In a further embodiment, referring to Figure 1 and Figure 3 A through groove 123 is provided on the seat body 110, and the through groove 123 is located on one side of the circumference corresponding to the through hole. The through groove 123 extends along the axial direction of the through hole and is connected to the through hole, so that the stylus mounting rod 300 can be inserted radially so that the seat body 110 can be installed on the stylus mounting rod 300.

[0042] The width of the through slot 123 should not be greater than the diameter of the through hole. In some embodiments, if the through slot 123 is provided on the side of the seat body 110 away from the limiting end 111, the width of the through slot 123 should be less than the diameter of the through hole to prevent the stylus mounting rod 300 from being separated from the seat body 110 through the through slot 123, causing the seat body 110 to fall, thereby improving the installation stability. Of course, the width of the through slot 123 should be only slightly smaller than the diameter of the through hole, so that after the seat body 110 is deformed under pressure, the opening of the through slot 123 is expanded, and the stylus mounting rod 300 can be installed into the seat body 110 through the through slot 123. Moreover, illustratively, the diameter of the through hole can also be slightly smaller than the diameter of the stylus mounting rod 300, so that the stylus mounting rod 300 can appropriately expand the through hole, which not only helps to reduce the processing accuracy requirements, but also helps to clamp the stylus mounting rod 300, further improving the installation stability.

[0043] In another embodiment, the rod body positioning cavity 121 may also be formed by a blind hole provided on the seat body 110. In this way, the seat body 110 may be sleeved and installed on the end of the stylus mounting rod 300. Similarly, a through groove 123 connected to the blind hole may be provided on the seat body 110 to facilitate the installation of the seat body 110 on the stylus mounting rod 300. In other embodiments, the rod body positioning cavity 121 may also be formed by a snap-in groove, which is provided on the side wall of the seat body 110, and the snap-in groove notch may serve as a lateral snap-in interface for the stylus mounting rod 300 to snap in radially. Exemplarily, the snap-in groove extends in a direction perpendicular to the limiting direction, and when the seat body 110 is installed on the stylus mounting rod 300, the rod body positioning cavity 121 and the stylus 400 are arranged in a cross shape.

[0044] In one embodiment, referring to Figure 1 and Figure 3The seat body 110 includes a first portion 112 and a second portion 113, wherein the first portion 112 and the second portion 113 form a step structure, and the step structure forms an accommodation space for accommodating the stylus 400; the rod body positioning cavity 121 is arranged across the first portion 112 and the second portion 113, and the abutment surface 122 is arranged on the second portion 113. In some other embodiments, the seat body 110 may also be provided with an angled structure by providing an inclined surface or an arc surface, and the angled area may be used as an accommodation space for accommodating the stylus 400, and an accommodation groove may be provided on the seat body 110, and the groove body of the accommodation groove may be used as an accommodation space for accommodating the stylus 400; in short, any space that can form a space for installing the stylus 400 may be used.

[0045] In a further embodiment, referring to Figure 4 The abutting surface 122 has a recess 1221, and the recess 1221 is used to partially accommodate the contact pin 400. The cross section of the recess 1221 can be arc-shaped, triangular, rectangular, trapezoidal or other shapes in different embodiments. Exemplarily, the cross section of the recess 1221 is an arc-shaped, and the arc shape is substantially the same as the outer surface profile of the contact pin 400, which helps the contact pin 400 to fit with the abutting surface 122 to improve the installation stability.

[0046] In some embodiments, reference Figure 4 The rod body positioning cavity 121 is located in the middle of the seat body 110 along the limiting direction, and two abutting surfaces 122 are provided, and the two abutting surfaces 122 are located on both sides of the rod body positioning cavity 121 along the limiting direction. In this way, it is helpful to cooperate with the bidirectional stylus 400 to improve the installation stability of the stylus limiting seat 100.

[0047] In one embodiment, the fixing structure 120 may also be a stylus positioning cavity provided on the seat body 110, and the stylus positioning cavity is for the stylus 400 to enter, that is, the seat body 110 is provided in a sleeve shape, and the seat body 110 limits the depth of the stylus 400 by being sleeved on the stylus 400.

[0048] For the seat body 110 in the above embodiment of the present application, its material can be plastic, or metal, rubber or wood, and its overall shape can be a cylinder, a cube, a sphere or any other shape that meets the design and use requirements.

[0049] The length of the seat body 110 in the limiting direction and the length along the axis of the stylus mounting rod 300 will affect the limiting degree, so the seat body 110 adopts an appropriate length in the limiting direction and the axis of the stylus mounting rod 300 to help reduce the impact on normal measurement. For example, the lengths in the above two directions can be selected between 5mm and 20mm, so that the seat body 110 has better adaptability in some detection scenarios. Exemplarily, the length of the seat body 110 in the limiting direction and the length of the stylus mounting rod 300 in the axis direction can be one of 5mm, 10mm, 15mm, and 20mm.

[0050] In addition, there may be multiple models of the stylus limit seat 100, corresponding to different lengths in the limit direction and lengths along the axis of the stylus mounting rod 300, thereby enabling the appropriate model of the stylus limit seat 100 to be adaptively selected according to the conditions of the object to be measured.

[0051] In one embodiment of a profilometer, referring to Figure 5 and Figure 6 , including a host 200, a stylus mounting rod 300 and a stylus 400 installed at one end of the stylus mounting rod 300 away from the host 200, the host 200 is provided with a driving mechanism 210, the stylus mounting rod 300 is installed on the driving mechanism 210, and the driving mechanism 210 is used to drive the stylus mounting rod 300 and the stylus 400 to move; and also includes the stylus limit seat 100 in any of the above embodiments.

[0052] The above specific examples are used to illustrate the present application, which is only used to help understand the present application and is not intended to limit the present application. For technicians in the technical field to which the present application belongs, they can also make some simple deductions, deformations or substitutions based on the ideas of the present application.

Claims

1. The probe limit seat is characterized by: include: A seat body, wherein a fixing structure is provided on the seat body, and the fixing structure is used to fix the seat body on the measuring needle of the contour measuring instrument; The seat body has a limiting direction, which is a direction parallel to the axial direction of the stylus of the contour measuring instrument when the stylus limiting seat is in use; the seat body has a limiting end located at the end of the limiting direction, the limiting end is for the tip of the stylus to extend, and the limiting end is used to support on the surface of the object to be measured so as to limit the depth of the stylus tip probing into the recess on the surface of the object to be measured.

2. The measuring needle limit seat according to claim 1, characterized in that: The fixing structure includes a rod positioning cavity and an abutment surface arranged on the seat body; the rod positioning cavity is for the stylus mounting rod of the contour measuring instrument to enter, and positions the seat body on the stylus mounting rod along the axial direction of the stylus; the abutment surface is used to abut against the outer surface of the stylus to limit the axial rotation of the seat body around the stylus mounting rod.

3. The measuring needle limit seat according to claim 2, characterized in that: The rod body positioning cavity has an insertion port for the contact pin mounting rod to be inserted axially, and the insertion port is located on the end surface of the seat body.

4. The measuring needle limit seat according to claim 3, characterized in that: The rod body positioning cavity is formed by a through hole or a blind hole arranged on the seat body.

5. The measuring needle limit seat according to claim 4, characterized in that: The seat body is provided with a through groove, the through groove is located on one side of the circumference corresponding to the rod body positioning cavity, the through groove extends along the axial direction of the rod body positioning cavity, and is communicated with the rod body positioning cavity.

6. The measuring needle limit seat according to any one of claims 2 to 5, characterized in that: The seat body comprises a first part and a second part, wherein the first part and the second part form a step structure, and the step structure forms an accommodating space for accommodating the contact pin; and the abutting surface is arranged on the second part.

7. The measuring needle limit seat according to claim 6, characterized in that: The abutment surface has a recessed portion, and the recessed portion is used to partially accommodate the contact pin.

8. The measuring needle limit seat according to claim 7, characterized in that: The cross section of the recess is arc-shaped.

9. The measuring needle limit seat according to any one of claims 2 to 5, characterized in that: The rod body positioning cavity is located in the middle of the seat body along the limiting direction, and the abutting surfaces are provided at two locations, and the two abutting surfaces are located at two sides of the rod body positioning cavity along the limiting direction.

10. A profile measuring instrument, characterized in that It comprises a mainframe, a stylus mounting rod and a stylus mounted at one end of the stylus mounting rod away from the mainframe, the mainframe is provided with a driving mechanism, the stylus is mounted on the driving mechanism, the driving mechanism is used to drive the stylus mounting rod and the stylus to move; it also comprises a stylus limit seat, the stylus limit seat is the stylus limit seat described in any one of claims 1 to 9.

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