Protective devices for measuring instruments

Abstract

The present disclosure describes a protective device for a measuring instrument. The protective device includes: a guide portion, a floating portion, a sensing portion, and a control portion for controlling the movement of a measuring lens. The guide portion is disposed on the measuring lens and is used to guide the floating portion to move in a preset direction. When measuring an object to be measured, at least a portion of the floating portion is located between the measuring lens and the object to be measured. The floating portion includes a sliding rod and a light source disposed on the sliding rod and located at an end of the measuring lens closest to the object to be measured. The sliding rod is disposed on the guide portion in a manner movable relative to the guide portion. The sensing portion includes a photoelectric sensor disposed on the guide portion and a detector disposed on the floating portion and used to block the photoelectric sensor's emission signal when the floating portion and the guide portion move relative to each other. The photoelectric sensor generates an electrical signal based on the detector blocking the emission signal, and transmits the electrical signal to the control portion, so that the control portion controls the measuring lens to move away from the object to be measured. According to the present disclosure, a protective device with a simple structure that can protect a measuring lens can be provided.

Description

Technical Field

[0001] The present disclosure relates to an intelligent manufacturing equipment industry, and in particular to a protective device for a measuring instrument. Background Art

[0002] With the rapid development of computer-based measurement technology, measuring instruments that rely on this technology have emerged for measuring the dimensions of objects under test. Typically, these instruments are imaging measuring instruments, which typically consist of a measuring platform, a measuring lens, and a light source positioned near the measuring platform at one end of the lens. The measuring lens captures an image of the object's surface, which is then analyzed using image processing techniques to determine the object's dimensions.

[0003] Generally speaking, when measuring an object to be measured, it is necessary to control the movement of the measuring lens and / or measuring platform to move the object to be measured within the visual area of the measuring lens. However, improper operation during the measurement process may cause the light source and the measuring platform to collide, potentially affecting the measurement accuracy of the measuring lens or even damaging the measuring lens. Patent document (CN109489564A) discloses an image measuring instrument with automatic collision avoidance. In this patent document, an anti-collision monitoring structure is provided to monitor whether the light source has been hit. If the light source has been hit, the anti-collision monitoring structure will receive a collision signal and control the light source to retreat to protect the measuring lens.

[0004] However, the aforementioned anti-collision monitoring structure is complex, requiring multiple conductive sheets, multiple conductive balls, and multiple insulating components to form multiple normally closed conductive loops to monitor whether the light source has been impacted. Furthermore, in this patent document, when the light source is impacted, the conductive balls and conductive sheets are separated to control the light source's retraction. After the light source has retreated a safe distance, the conductive balls come into contact with each other. The separation and contact between the conductive balls and the conductive sheets causes wear, necessitating frequent maintenance of the conductive balls and sheets. Summary of the Invention

[0005] The present disclosure is proposed in view of the above-mentioned state of the prior art, and its purpose is to provide a protective device with a simple structure and capable of protecting a measuring lens.

[0006] The present disclosure provides a protective device for a measuring instrument, which is used to protect a measuring lens of the measuring instrument during measurement of an object to be measured. The protective device includes: a guide portion, a floating portion, a sensing portion, and a control portion for controlling the movement of the measuring lens. The guide portion is provided on the measuring lens and is used to guide the floating portion to move in a preset direction. When measuring the object to be measured, at least a portion of the floating portion is located between the measuring lens and the object to be measured. The floating portion includes a sliding rod and a light source provided on the sliding rod and located at an end of the measuring lens closest to the object to be measured. The sliding rod is provided on the guide portion in a manner movable relative to the guide portion. The sensing portion includes a photoelectric sensor provided on the guide portion and a detector provided on the floating portion and used to block an emission signal from the photoelectric sensor when the floating portion and the guide portion move relative to each other. The photoelectric sensor generates an electrical signal based on the detector blocking the emission signal, and transmits the electrical signal to the control portion, so that the control portion controls the measuring lens to move away from the object to be measured.

[0007] In this case, during the process of the measuring instrument measuring the object to be measured, when the light source is subjected to external force, the floating part will move in a preset direction, and the guide part can guide the floating part to move in the preset direction, while driving the detector to move in the preset direction. When the detector blocks the invisible light path of the photoelectric sensor, it means that the floating part has moved a preset distance in the preset direction. At this time, the photoelectric sensor can form an electrical signal based on the detector blocking the transmitted signal and send the electrical signal to the control part. The control part can control the measuring lens to move away from the object to be measured based on the received electrical signal. The protective device can achieve the purpose of intelligently protecting the measuring lens. As a result, the light source will not be further squeezed and damaged, and the measuring lens can be protected from damage, thereby maintaining the measurement accuracy of the measuring instrument.

[0008] In the protective device of the present disclosure, the floating portion may optionally further include a first floating plate disposed on the periphery of the measuring lens, a second floating plate disposed on the measuring lens, a first fixing block for connecting the sliding rod and the first floating plate, and a second fixing block for connecting the sliding rod and the second floating plate. In this case, the first and second fixing blocks can be used to mount the sliding rod between the first and second floating plates.

[0009] In addition, in the protective device of the present disclosure, the detector is optionally disposed on the second fixed block. In this case, the detector can remain relatively stationary with the second fixed block, that is, relatively stationary with the floating portion, and when the floating portion moves a predetermined distance in a predetermined direction, the detector can follow the movement.

[0010] In addition, in the protective device of the present disclosure, the light source can optionally be connected to the sliding rod via the second fixing block. In this case, the light source can be fixed to the sliding rod, and if the bottom of the light source is subjected to external force from the object to be measured, the floating portion can move in a predetermined direction.

[0011] Additionally, in the protective device of the present disclosure, the guide portion optionally includes a linear bearing, a bearing seat matching the linear bearing, and a fixed plate connected to the bearing seat and positioned around the periphery of the measuring lens. The linear bearing cooperates with the sliding rod to enable the sliding rod to move relative to the guide portion. In this case, the guide portion can remain relatively fixed relative to the measuring lens, thereby providing stable linear motion for the floating portion, thereby enabling the floating portion to move more stably within the guide portion.

[0012] Additionally, the protective device of the present disclosure optionally further includes an elastic member for maintaining a pulling force on the floating portion in a direction opposite to the preset direction, with one end of the elastic member being attached to the first floating plate and the other end being attached to the fixed plate. In this case, the elastic member can continuously provide a slight downward pulling force on the floating portion during measurement of the object to be measured. Even if the light source is impacted by an abnormal factor, the pulling force of the elastic member can quickly return the floating portion to its initial position, further ensuring the reliability of the measuring instrument.

[0013] Additionally, in the protective device of the present disclosure, the linear bearing may optionally include a first groove surrounding the linear bearing and for mounting a first circlip, and a second groove surrounding the linear bearing and for mounting a second circlip, with the linear bearing being mounted on the bearing seat via the first and second circlips. In this case, the linear bearing can be secured to the bearing seat by mounting the first circlip in the first groove and the second circlip in the second groove. In other words, this arrangement prevents the linear bearing from moving relative to the bearing seat.

[0014] Additionally, in the protective device of the present disclosure, the floating portion optionally further includes a first rubber pad and a second rubber pad, wherein the first rubber pad is disposed on the outer periphery of the sliding rod and located between the linear bearing and the first fixed block, and the second rubber pad is disposed on the outer periphery of the sliding rod and located between the linear bearing and the second fixed block. In this case, when the sliding rod moves relative to the linear bearing, the noise generated by the movement of the floating portion is reduced while also reducing vibrations caused by the movement, thereby further protecting the light source and the measurement lens.

[0015] In addition, in the protection device of the present disclosure, optionally, the photoelectric sensor is disposed on the bearing seat, thereby enabling the photoelectric sensor and the bearing seat to maintain a relatively stationary state.

[0016] Furthermore, in the protective device of the present disclosure, the light source can optionally be a ring-shaped light source. In this case, it can provide illumination from multiple directions to the object under test, maintaining a stable brightness around the object. This enables the measurement lens to obtain more stable image information, which is beneficial for improving the imaging effect of image processing.

[0017] According to the present disclosure, a protection device having a simple structure and capable of protecting a measuring lens can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present disclosure will now be explained in further detail, by way of example only, with reference to the accompanying drawings.

[0019] Figure 1 Schematic diagram showing an application scenario of the measuring instrument involved in the example of the present disclosure.

[0020] Figure 2 1 is a block diagram showing the structure of a measuring instrument according to an example of the present disclosure.

[0021] Figure 3 It is a three-dimensional schematic diagram showing the cooperation between the protection device and the measuring lens involved in the example of the present disclosure.

[0022] Figure 4 1 is a schematic diagram showing a first viewing angle of the protective device involved in the example of the present disclosure in conjunction with the measuring lens.

[0023] Figure 5 1 is a partial cross-sectional enlarged view showing a protection device according to an example of the present disclosure.

[0024] Figure 6 1 is an exploded schematic diagram showing a protection device according to an example of the present disclosure.

[0025] Figure 7 3 is a schematic diagram showing a second viewing angle of the protective device involved in the example of the present disclosure in conjunction with the measuring lens.

[0026] Figure 8 is a flowchart illustrating a protection method involved in an example of the present disclosure. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. In the following description, identical components are assigned identical reference numerals, and duplicate descriptions are omitted. In addition, the accompanying drawings are merely schematic, and the proportions of the dimensions of the components and the shapes of the components may differ from the actual ones.

[0028] It should be noted that the terms "including" and "having" and any variations thereof in this disclosure, such as a process, method, coordinate measuring device, product or equipment that includes or has a series of steps or units, are not necessarily limited to those steps or units clearly listed, but may include or have other steps or units that are not clearly listed or are inherent to these processes, methods, products or equipment.

[0029] In addition, it should be noted that the relative position and relative direction terms such as "above", "towards above", "below", "towards downward", "up and down directions", "left side", "towards the left side", "left direction", "towards the left", "right side", "towards the right side", "right side", "towards the right", "left and right directions", "front", "towards the front", "back", "towards the back", "front and back directions" in this document refer to the normal operating posture and should not be considered as restrictive.

[0030] Embodiments of the present disclosure relate to a protective device for a measuring instrument, which can be used to protect the measuring lens of the measuring instrument. The protective device described in this embodiment can effectively reduce the probability of collisions with the light source when measuring the dimensions of an object to be measured, thereby protecting the measuring lens and maintaining high measurement accuracy of the measuring instrument.

[0031] The protective device for a measuring instrument involved in this embodiment may be simply referred to as a protective device. In some examples, the protective device may be referred to as an anti-collision device, a buffer device, etc. It should be noted that the various names are intended to indicate the device for a measuring instrument involved in this embodiment and should not be construed as limiting.

[0032] Figure 1 Schematic diagram showing an application scenario of the measuring instrument 1 involved in the example of the present disclosure. Figure 2 1 is a block diagram showing the structure of a measuring instrument 1 according to an example of the present disclosure.

[0033] The protective device 10 of this embodiment can be applied to a measuring instrument 1 for measuring information about an object to be measured, such as the two-dimensional dimensions, three-dimensional dimensions, or surface topography of the object to be measured. In some examples, the measuring instrument 1 can be any instrument that includes a measuring lens 20 (described later), particularly an instrument in which the measuring lens 20 needs to move perpendicular to a measuring platform 30. For example, the measuring instrument 1 can be an image measuring instrument, a white light interferometer, or a flash meter.

[0034] The following describes the protective device 10 according to this embodiment, using a vision measuring instrument as an example. It should be noted that, for other measuring instruments 1, those skilled in the art can, by making minor modifications to the protective device 10 used for the vision measuring instrument, protect the measuring lens 20 of other measuring instruments 1.

[0035] See also Figure 1 The protection device 10 of this embodiment can be applied to an image measuring instrument. In some examples, the image measuring instrument can realize two-dimensional coordinate measurement of an object to be measured.

[0036] In some examples, the measuring instrument 1 may include a measuring lens 20 and a measuring platform 30. The measuring lens 20 may be used to obtain image information of the object to be measured, and the measuring platform 30 may be used to support the object to be measured.

[0037] In some examples, the measurement lens 20 may be substantially cylindrical.

[0038] In some examples, during the measurement of the object to be measured, the measuring lens 20 can be close to the measuring platform 30. The protective device 10 involved in this embodiment is intended to reduce the probability of the light source 122 (described later) colliding with the measuring platform 30 and / or the object to be measured when the measuring lens 20 is close to the measuring platform 30. In this case, when the object to be measured is measured, the protective device 10 can protect the light source 122 from collision as much as possible, thereby protecting the measuring lens 20 from damage to maintain the measurement accuracy of the measuring instrument 1. In other words, the protective device 10 can be used to protect the measuring lens 20 of the measuring instrument 1 during the measurement of the object to be measured. In some examples, the protective device 10 also protects the light source 122. At the same time, the protective device 10 involved in this embodiment has a simple structure and is easy to implement.

[0039] See also Figure 2 In some examples, the protective device 10 may include a guide portion 110, a floating portion 120, and a sensor portion 130. The guide portion 110 may be used to guide the movement of the floating portion 120. The floating portion 120 may be used to move a preset distance on the guide portion 110 when an external force is applied to the light source 122. The sensor portion 130 may be used to monitor the movement of the floating portion 120. In some examples, the protective device 10 may further include a control portion 140. The control portion may be used to control the movement of the measuring lens 20. In some examples, the control portion 140 may be automatically controlled. In other examples, the control portion 140 may be manually controlled.

[0040] In some examples, the predetermined distance may be related to the location where the sensing portion 130 is disposed.

[0041] Figure 3 It is a three-dimensional schematic diagram showing the cooperation between the protection device 10 and the measuring lens 20 involved in the example of the present disclosure. Figure 4 1 is a schematic diagram showing a first viewing angle of the protective device 10 and the measuring lens 20 involved in the example of the present disclosure. Figure 5 1 is a partially enlarged cross-sectional view showing a protection device 10 according to an example of the present disclosure.

[0042] See also Figure 3 In the protective device 10 of this embodiment, the guide portion 110 can be provided on the measuring lens 20. For example, the guide portion 110 can be provided on the periphery of the measuring lens 20. In some examples, the guide portion 110 can be provided on the periphery of the measuring lens 20 and close to one end of the measuring platform 30. In other examples, the guide portion 110 can be provided at any position on the periphery of the measuring lens 20.

[0043] In some examples, the guide portion 110 can be used to guide the floating portion 120 to move in a preset direction D1. The preset direction D1 can be as follows: Figure 3 In some examples, the preset direction D1 may be a direction perpendicular to the measurement platform 30. For example, if the measurement platform 30 is arranged horizontally, the preset direction D1 may be a vertical direction. In some examples, the preset direction D1 may be a direction parallel to the central axis of the measurement lens 20.

[0044] As described above, the guide portion 110 can be used to guide the movement of the floating portion 120. In some examples, when measuring an object under test, at least a portion of the floating portion 120 can be positioned between the measurement lens 20 and the object under test. If at least a portion of the floating portion 120 contacts the object under test or is subjected to a compressive force from the object under test, the floating portion 120 will move a predetermined distance in a predetermined direction D1 to move the measurement lens 20 away from the object under test. In some examples, the at least a portion of the floating portion 120 can be the light source 122. In other examples, the at least a portion of the floating portion 120 can include more components.

[0045] See also Figure 4 and Figure 5 In some examples, the floating portion 120 can include a sliding rod 121 and a light source 122. The sliding rod 121 can be used to cooperate with the guide portion 110 to allow the floating portion 120 to be movably disposed on the guide portion 110. The light source 122 can be used to illuminate the object under test. Specifically, the light source 122 can illuminate the object under test and create an imaging effect that is beneficial for image processing, thereby improving image stability.

[0046] Figure 6 1 is an exploded schematic diagram showing a protection device 10 according to an example of the present disclosure.

[0047] See also Figure 6 In some examples, the sliding rod 121 can be cylindrical. This reduces frictional resistance during movement of the sliding rod 121, making its movement smoother. In some examples, both ends of the sliding rod 121 can have threaded holes. In this case, the sliding rod 121 can be connected to other components of the floating portion 120 through the threaded holes (described in detail later).

[0048] In some examples, the floating portion 120 may include a plurality of sliding rods 121. For example, the floating portion 120 may include a plurality of sliding rods 121. Figure 6 The illustrated sliding rods 121a and 121b are shown. In other examples, the floating portion 120 may include three, four, five, six, or other plurality of sliding rods 121. When the floating portion 120 includes multiple sliding rods 121, the plurality of sliding rods 121 may be symmetrically arranged around the periphery of the measuring lens 20. The guide portion 110 may also include multiple sliding rails that match the plurality of sliding rods 121. In this case, when the floating portion 120 moves, it can maintain a higher degree of balance, protecting the measuring lens 20 from collisions. In other examples, the plurality of sliding rods 121 may not be arranged symmetrically.

[0049] In some examples, the floating portion 120 may further include a first fixing block 123 and a second fixing block 124. For ease of description, the sliding rod 121 may have a first end and a second end, the first fixing block 123 may be disposed at the first end, and the second fixing block 124 may be disposed at the second end.

[0050] As described above, both ends of the sliding rod 121 may have threaded holes. In some examples, the first end may have a first threaded hole, and the second end may have a second threaded hole. The first fixing block 123 may be fixed to the first end by a first fixing member, and the second fixing block 124 may be fixed to the second end by a second fixing member. The first fixing member and the second fixing member may be bolts or screws. In some examples, the first fixing block 123 may have a through hole that matches the first fixing member, and the second fixing block 124 may have a through hole that matches the second fixing member. In this case, the first fixing member can pass through the first fixing block 123 and fix the first fixing block 123 to the first end, and the second fixing member can pass through the second fixing block 124 and fix the second fixing block 124 to the second end.

[0051] In some examples, the first fixing block 123 and the second fixing block 124 may have the same shape and height, such as a substantially cylindrical shape, a prism shape, or other irregularly shaped columns.

[0052] In some examples, when the floating portion 120 includes a plurality of sliding rods 121, it may also include a plurality of first fixing blocks 123 and a plurality of second fixing blocks 124 that match the plurality of sliding rods 121. Figure 6 The floating portion 120 may include two sliding rods 121. Specifically, it may include a sliding rod 121a and a sliding rod 121b. In this case, the floating portion 120 may also include a first fixing block 123a1 and a second fixing block 124a2 disposed at both ends of the sliding rod 121a, and a first fixing block 123b1 and a second fixing block 124b2 disposed at both ends of the sliding rod 121b.

[0053] See also Figure 6 In some examples, the floating portion 120 may further include a first floating plate 127 disposed on the periphery of the measuring lens 20, a second floating plate 128 disposed on the measuring lens 20, a first fixing block 123 for connecting the sliding rod 121 and the first floating plate 127, and a second fixing block 124 for connecting the second floating plate 128. In this case, the sliding rod 121 can be mounted between the first floating plate 127 and the second floating plate 128 using the first fixing block 123 and the second fixing block 124.

[0054] In some examples, the first floating plate 127 can be connected to the sliding rod 121 via the first fixing block 123 , and the second sliding plate can be connected to the sliding rod 121 via the second fixing block 124 , thereby enabling synchronization of the plurality of sliding rods 121 .

[0055] In some examples, the floating portion 120 may further include a first floating plate 127. The first floating plate 127 may be used to connect the plurality of first fixed blocks 123. This allows the plurality of sliding rods 121 to synchronize their movements. The first floating plate 127 may be disposed on the periphery of the measuring lens 20. Specifically, the first floating plate 127 may have an inner surface that matches the outer surface of the measuring lens 20. This allows the first floating plate 127 to have a high degree of compatibility with the measuring lens 20. In some examples, the floating portion 120 may further include a second floating plate 128. The second floating plate 128 may be used to connect the plurality of second fixed blocks 124. The second floating plate 128 may be disposed on the periphery of the measuring lens 20. Specifically, the second floating plate 128 may have an inner surface that matches the outer surface of the measuring lens 20. This allows the second floating plate 128 to have a high degree of compatibility with the measuring lens 20.

[0056] In some examples, the first fixed block 123 and the first floating plate 127 may be connected together by welding or gluing. In other examples, the first fixed block 123 and the first floating plate 127 may be integrally formed. In some examples, the second fixed block 124 and the second floating plate 128 may be connected together by welding, gluing, or snapping. In other examples, the second fixed block 124 and the second floating plate 128 may be integrally formed.

[0057] In some examples, the light source 122 can be mounted on the sliding rod 121 and located at the end of the measuring lens 20 closest to the object under test. In some examples, the light source 122 can be connected to the second fixing block 124. In other words, the light source 122 can be connected to the sliding rod 121 via the second fixing block 124. In this case, the light source 122 can be fixed to the sliding rod 121. If the bottom of the light source 122 is subjected to external force from the measuring platform 30 and / or the object under test, the floating portion 120 can move in a predetermined direction D1.

[0058] In some examples, when measuring an object to be measured, light source 122 may be located between measurement lens 20 and the object to be measured. Alternatively, light source 122 may be located between measurement lens 20 and measurement platform 30. In some examples, regardless of whether the object to be measured is being measured, light source 122 may be located between measurement lens 20 and measurement platform 30. When the bottom portion of light source 122 (i.e., the portion close to measurement platform 30 and / or the object to be measured) is subjected to an external force, it can be considered that light source 122 is in compression with measurement platform 30 and / or the object to be measured. At this point, floating portion 120 moves a predetermined distance in a predetermined direction D1 to protect light source 122 from further compression, thereby protecting measurement lens 20.

[0059] In some examples, the light source 122 may be provided with a feedback travel. Within this travel, the light source 122 may have a self-protection mechanism. In this case, even if the light source 122 is squeezed by external forces, it will not be damaged. The protective device 10 of this embodiment protects the light source 122 from further compression, that is, it prevents the light source 122 from being squeezed beyond the feedback travel. This protects the light source 122 while also protecting the measurement lens 20.

[0060] As described above, the sliding rod 121 can be provided with a light source 122. In other words, in some examples, the light source 122 can be provided on the sliding rod 121. The light source 122 can be used to illuminate the target part. In some examples, the light source 122 can also be used to overcome ambient brightness interference to maintain a stable brightness around the object under test. In this case, the measuring lens 20 can obtain more stable image information, which helps improve the imaging quality of image processing and further reduces the complexity of the computing system of the measuring instrument 1.

[0061] In some examples, light source 122 may be a ring-shaped light source. Light source 122 may include a bottom light source and side light sources surrounding the bottom light source. In this case, illumination light can be provided to the object under test from multiple directions, maintaining a stable brightness around the object. This enables the measurement lens 20 to obtain more stable image information, which improves the imaging quality of image processing. In some examples, the bottom light source may be circular, rectangular, or in any irregular shape. In some examples, the bottom light source may include a through hole for the measurement lens 20 to pass through. This allows the measurement lens 20 to pass through the bottom light source and obtain stable image information of the object under test under the illumination of light source 122.

[0062] As described above, the guide portion 110 can be used to guide the floating portion 120 to move in the predetermined direction D1. In some examples, the sliding rod 121 can be disposed on the guide portion 110. In other examples, the sliding rod 121 can be disposed on the guide portion 110 in a manner that is movable relative to the guide portion 110.

[0063] In some examples, the guide portion 110 may include a sliding track arranged in a predetermined direction D1. Thus, the guide portion 110 can provide a guide track in the predetermined direction D1. In some examples, the sliding track can provide linear motion. In other examples, the sliding track can provide curved motion.

[0064] Specifically, in some examples, the guide portion 110 may include a linear bearing 111 and a bearing seat 112 that matches the linear bearing 111. The linear bearing 111 may be a system that provides linear motion. In some examples, the linear motion provided by the linear bearing 111 may have lower frictional resistance and provide more precise and smooth linear motion. This allows the floating portion 120 to move more stably within the guide portion 110. In some examples, the linear bearing 111 may be a cylindrical shaft.

[0065] In some examples, the linear bearing 111 can be disposed in the bearing seat 112. Specifically, in some examples, the linear bearing 111 can have a first groove 114 surrounding the linear bearing 111 and for mounting a first circlip 116, and a second groove 115 surrounding the linear bearing 111 and for mounting a second circlip 117. The linear bearing 111 can be disposed in the bearing seat 112 via the first circlip 116 and the second circlip 117. In this case, by disposing the first circlip 116 in the first groove 114 and the second circlip 117 in the second groove 115, the linear bearing 111 can be fixed to the bearing seat 112. In other words, through this arrangement, the linear bearing 111 will not move relative to the bearing seat 112.

[0066] As described above, the guide portion 110 may include a plurality of sliding rails that match the plurality of sliding rods 121. Figure 6 In some examples, the guide portion 110 may include two sliding rails. Specifically, it may include a linear bearing 111a and a bearing seat 112a that matches the linear bearing 111, and a linear bearing 111b and a bearing seat 112b that matches the linear bearing 111. The relevant matching and connection relationships can be as described above and will not be repeated here.

[0067] Figure 7 1 is a schematic diagram showing a second viewing angle of the protective device 10 and the measuring lens 20 according to an example of the present disclosure.

[0068] In some examples, the measuring instrument 1 may further include a fixing fixture 40 for fixing the measuring lens 20. Figure 3 Specifically, the fixing fixture 40 may include a first fixing seat 410, a first clamping block 420 cooperating with the first fixing seat 410, a second fixing seat 430, and a second clamping block 440 cooperating with the second fixing seat 430. The first fixing seat 410 and the first clamping block 420 may be disposed at an end of the measuring lens 20 away from the measuring platform 30 to clamp the measuring lens 20. The second fixing seat 430 and the second clamping block 440 may be disposed at an end of the measuring lens 20 closer to the measuring platform 30 to clamp the measuring lens 20. In other examples, the second fixing seat 430 and the second clamping block 440 may also be disposed at any position around the periphery of the measuring lens 20. In some examples, the second fixing seat 430 and the second clamping block 440 may be fixed to a Z-axis moving portion (described later).

[0069] In some examples, the guide portion 110 may further include a fixing plate 113. The fixing plate 113 may be connected to the bearing seat 112 and located at the periphery of the measuring lens 20. In some examples, the fixing plate 113 may be used to connect multiple bearing seats 112, for example, the bearing seat 112a and the bearing seat 112b (see FIG. Figure 6 In other examples, the bearing seats 112a and 112b and the fixing plate 113 may be integrally formed. In some examples, the fixing plate 113 may be fixed to a fixing base 410 that is used to clamp the measuring lens 20. In this case, the guide portion 110 can remain relatively fixed relative to the measuring lens 20, thereby providing stable linear motion for the floating portion 120.

[0070] As described above, the second fixing base 430 and the second clamping block 440 can be fixed to the Z-axis moving portion. In some examples, the Z-axis moving portion can move in a predetermined direction D1 and a direction opposite to the predetermined direction D1. The measurement lens 20 can be fixed to the Z-axis moving portion via the second fixing base 430 and the second clamping block 440. Movement of the Z-axis moving portion can drive the measurement lens 20 to move, for example, closer to or further away from the object under test.

[0071] In some examples, the second fixing base 430 and the second clamping block 440 can be fixed to any component that is relatively stationary with respect to the Z-axis moving portion.

[0072] In some examples, the bearing seat 112 may be fixedly connected to the second fixing seat 430. In other words, during the movement of the measuring lens 20, the bearing seat 112 and the measuring lens 20 may not move relative to each other.

[0073] In some examples, the second fixing base 430 and the second clamping block 440 may be included in the guide portion 110. In this case, the second fixing base 430 can provide a stable base for the installation of the linear bearing 111 and the bearing seat 112, thereby preventing the bearing seat 112 and the measuring lens 20 from moving relative to each other.

[0074] In some examples, the linear bearing 111 can cooperate with the sliding rod 121 so that the sliding rod 121 can move relative to the guide portion 110. In this case, the sliding rod 121 can move relative to the linear bearing 111 in a predetermined direction D1, and the floating portion 120 can move relative to the guide portion 110.

[0075] See also Figure 5 and Figure 6 In some examples, the floating portion 120 may further include a first rubber pad 125 and a second rubber pad 126. The first rubber pad 125 and the second rubber pad 126 may be disposed on the periphery of the sliding rod 121. In some examples, the first rubber pad 125 and the second rubber pad 126 may be used to reduce vibrations during movement of the floating portion 120, thereby providing a shock-absorbing function. In some examples, the first rubber pad 125 and the second rubber pad 126 may also reduce noise generated during movement of the floating portion 120, thereby providing a noise reduction function. When multiple sliding rods 121 are included, multiple first rubber pads 125 and multiple second rubber pads 126 may also be included to match the multiple sliding rods 121. This description will not be repeated here.

[0076] In some examples, the first rubber pad 125 can be disposed on the outer periphery of the sliding rod 121 and located between the linear bearing 111 and the first fixed block 123, and the second rubber pad 126 can be disposed on the outer periphery of the sliding rod 121 and located between the linear bearing 111 and the second fixed block 124. In this case, when the sliding rod 121 moves relative to the linear bearing 111, the vibration of the floating portion 120 caused by the movement can be minimized while reducing noise, thereby further protecting the light source 122 and the measuring lens 20.

[0077] As described above, the protective device 10 according to this embodiment further includes a sensor unit 130. The sensor unit 130 can be used to monitor whether the floating portion 120 is moving. In some examples, the sensor unit 130 can include a photoelectric sensor 131 and a detector 132. The photoelectric sensor 131 can be used to emit a transmission signal. The detector 132 can be used to block the transmission signal of the photoelectric sensor 131. Furthermore, the photoelectric sensor 131 can also be used to receive the transmission signal blocked by the detector 132.

[0078] In some examples, photoelectric sensor 131 can be any device that can transmit a light signal, a radar signal, or an electronic signal. For example, photoelectric sensor 131 can be a photoelectric switch. In some examples, the transmitted signal can be a light signal, a radar signal, or an electronic signal. In some examples, detector 132 can be any device that can reflect (or block) any of the above signals. Detector 132 can also be referred to as a light isolator.

[0079] In the protection device 10 of this embodiment, the photoelectric sensor 131 can generate an electrical signal based on the detector 132 blocking the transmitted signal. The electrical signal is then transmitted to the control unit 140, causing the control unit 140 to control the measurement lens 20 away from the object under test. For example, in some examples, the detector 132 can block the invisible light path of the photoelectric sensor 131, causing the photoelectric sensor 131 to transmit different high- or low-frequency electrical signals to the control unit 140. The control unit 140 receives the corresponding electrical signals and controls the measurement lens 20 away from the object under test, thereby protecting the measurement lens 20 and ensuring the safety and reliability of the measurement process.

[0080] In some examples, the photosensor 131 can be disposed on the guide portion 110. In some examples, the detector 132 can be disposed on the floating portion 120. In this case, if the floating portion 120 moves a predetermined distance relative to the guide portion 110, the detector 132 can block the signal transmitted by the photosensor 131. In other words, the detector 132 can be disposed on the floating portion 120 and block the signal transmitted by the photosensor 131 when the floating portion 120 and the guide portion 110 move relative to each other. Thus, movement of the floating portion 120 relative to the guide portion 110 can be determined based on the signal being blocked by the detector 132. Specifically, as described above, in some examples, the detector 132 can block the invisible light path of the photosensor 131, causing the photosensor 131 to transmit different high-frequency or low-frequency electrical signals to the control portion 140.

[0081] like Figure 7 As shown, in some examples, the photoelectric sensor 131 can be disposed on the bearing seat 112. Thus, the photoelectric sensor 131 can maintain a relatively static state with the bearing seat 112.

[0082] In some examples, the detector 132 can be mounted on the second fixed block 124. In this case, the detector 132 can remain stationary relative to the second fixed block 124, and therefore relative to the floating portion 120. When the floating portion 120 moves a predetermined distance in a predetermined direction D1, the detector 132 can follow the movement. In other examples, the detector 132 can also be mounted on any component of the floating portion 120.

[0083] In this embodiment, the photoelectric sensor 131 can generate an electrical signal based on the detector 132 blocking the transmitted signal. The protective device 10 can control the measuring lens 20 to move away from the object under test based on the electrical signal. Specifically, in some examples, the protective device 10 may further include a control unit 140. The control unit 140 can be used to control the measuring lens 20 to move away from or towards the object under test. For example, when measuring the object under test, the control unit 140 can control the measuring lens 20 to move closer to the object under test so that the object under test enters the measurement field of view of the measuring lens 20. After the measurement is completed, the measuring lens 20 can be controlled to move away from the object under test. In some examples, the control unit 140 can also control the measuring lens 20 to move away from the object under test when the light source 122 is impacted. In other words, when the floating portion 120 moves a preset distance in the preset direction D1, the control unit 140 can control the measuring lens 20 to move away from the object under test.

[0084] In some examples, the photosensor 131 can send an electrical signal to the control unit 140. Based on the received electrical signal, the control unit 140 can control the measurement lens 20 to move away from the object under test. Thus, the protective device 10 can protect the measurement lens 20. In some examples, controlling the measurement lens 20 to move away from the object under test also controls the light source 122 to move away from the object under test.

[0085] In some examples, the protective device 10 may further include an elastic member 150 for maintaining a pulling force on the floating portion 120 in a direction opposite to the predetermined direction D1. One end of the elastic member 150 may be disposed on the first floating plate 127, and the other end of the elastic member 150 may be disposed on the fixed plate 113. In some examples, the direction opposite to the predetermined direction D1 may be a vertically downward direction. In this case, during measurement of the object under test, the elastic member 150 can continuously provide a slight downward pulling force on the floating portion 120. Even if the light source 122 is impacted by an abnormal factor, the pulling force of the elastic member 150 can quickly return the floating portion 120 to its initial position, further ensuring the reliability of the measuring instrument 1.

[0086] In some examples, the initial position may be a position where the floating portion 120 has not moved.

[0087] In some examples, if the protective device 10 includes only one sliding rod 121, the protective device 10 may not include the first floating plate 127, the second floating plate 128, and the fixed plate 113. In some examples, the protective device 10 may further include an elastic member 150 (some figures are simplified for clarity) for maintaining the tension of the floating portion 120 in the predetermined direction D1. If the protective device 10 includes only one sliding rod 121, one end of the elastic member 150 may be disposed on the first fixed block 123, and the other end of the elastic member 150 may be disposed on the bearing seat 112.

[0088] Figure 8 is a flowchart illustrating a protection method involved in an example of the present disclosure.

[0089] This embodiment also discloses a method for protecting the measuring lens 20. Figure 8 The method for protecting the measuring lens 20 may include: if the light source 122 is subjected to an external force, the floating portion 120 moves in a predetermined direction D1 (step S200), the sensing portion 130 monitors a movement signal of the floating portion 120, and in response to the sensing portion 130 monitoring the movement signal of the floating portion 120, sends an electrical signal to the control portion 140 (step S400), and the control portion 140 controls the measuring lens 20 to move away from the measuring platform 30 (step S600).

[0090] According to the present disclosure, when the measuring instrument 1 is measuring information of the object to be measured, when the measuring lens 20 approaches the object to be measured, if the light source 122 comes into contact with the measuring lens 20 and is subjected to external force within the feedback stroke range, the floating portion 120 will move in the preset direction D1. When the detector 132 blocks the invisible light path of the photoelectric sensor 131, it means that the floating portion 120 has moved in the preset direction D1. At this time, the photoelectric sensor 131 can generate an electrical signal based on the transmission signal blocked by the detector 132 and send the electrical signal to the control unit 140. The control unit 140 can control the measuring lens 20 to move away from the object to be measured based on the received electrical signal. The protective device 10 can achieve the purpose of intelligently protecting the measuring lens 20. As a result, the light source 122 will not be further squeezed and damaged, thereby protecting the measuring lens 20 from damage and maintaining the measurement accuracy of the measuring instrument 1.

[0091] Although the disclosure is described in detail above with reference to the accompanying drawings and examples, it is to be understood that the above description does not limit the disclosure in any form. Those skilled in the art may modify and change the disclosure as needed without departing from the spirit and scope of the disclosure, and such modifications and variations fall within the scope of the disclosure.

Claims

1. A protective device for a measuring instrument, which is used to protect a measuring lens of the measuring instrument during measurement of an object to be measured, characterized in that: The protective device includes: a guide portion, a floating portion, a sensing portion, and a control portion for controlling the movement of the measuring lens. The guide portion is provided on the measuring lens and is used to guide the floating portion to move in a preset direction. The guide portion includes a linear bearing, a bearing seat matching the linear bearing, and a fixed plate connected to the bearing seat and located at the periphery of the measuring lens. When measuring the object to be measured, at least a portion of the floating portion is located between the measuring lens and the object to be measured. The floating portion includes a sliding rod, a light source provided on the sliding rod and located at an end of the measuring lens close to the object to be measured, a first floating plate provided on the periphery of the measuring lens, a second floating plate provided on the measuring lens, a first fixed block for connecting the sliding rod and the first floating plate, and a fixed block for connecting the sliding rod. The sliding rod is provided on the guide portion in a manner that it can move relative to the guide portion, wherein the linear bearing cooperates with the sliding rod so that the sliding rod can move relative to the guide portion, and the light source is connected to the sliding rod through the second fixed block; the sensing portion includes a photoelectric sensor provided on the guide portion and a detector provided on the floating portion and used to block the emission signal of the photoelectric sensor when the floating portion and the guide portion move relative to each other, the photoelectric sensor is provided on the bearing seat, and the detector is provided on the second fixed block, the photoelectric sensor forms an electrical signal based on the detector blocking the emission signal and sends the electrical signal to the control portion so that the control portion controls the measuring lens to move away from the object to be measured.

2. The protection device according to claim 1, characterized in that An elastic member is further included for maintaining the floating portion with a pulling force in a direction opposite to the preset direction, one end of the elastic member is arranged on the first floating plate, and the other end of the elastic member is arranged on the fixed plate.

3. The protection device according to claim 1, characterized in that: The linear bearing has a first groove surrounding the linear bearing and used for installing a first elastic retaining ring, and a second groove surrounding the linear bearing and used for installing a second elastic retaining ring. The linear bearing is arranged on the bearing seat through the first elastic retaining ring and the second elastic retaining ring.

4. The protection device according to claim 1, characterized in that The floating part also includes a first rubber pad and a second rubber pad. The first rubber pad is arranged on the outer periphery of the sliding rod and is located between the linear bearing and the first fixed block. The second rubber pad is arranged on the outer periphery of the sliding rod and is located between the linear bearing and the second fixed block.

5. The protection device according to claim 1, characterized in that: The light source is a ring-shaped light source.

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