Anti-collision device for measuring instrument and measuring instrument

Abstract

The invention discloses an anti-collision device for a measuring instrument, which is characterized in that the anti-collision device comprises a guide part and a floating part, and the guide part is arranged on the periphery of a measuring lens of the measuring instrument and is used for guiding the floating part to move in a preset direction; the floating part comprises a sliding rod and a light source arranged on the sliding rod and located at the end, close to the to-be-measured object, of the measuring lens, and the sliding rod is arranged on the guide part in the mode of being capable of moving relative to the guide part. When the light source is subjected to unexpected acting force, the floating part moves a preset distance away from the to-be-measured object in the preset direction relative to the guide part. According to the invention, the anti-collision device which is simple in structure and can protect the measuring lens can be provided.

Description

[0001] This application is a divisional application of the patent application filed on June 20, 2022, with application number 2022107000543, entitled "Protective Device for Measuring Instruments". Technical Field

[0002] This disclosure relates to an intelligent manufacturing equipment industry, specifically to an anti-collision device for measuring instruments and a measuring instrument. Background Technology

[0003] With the rapid development of computer measurement technology, measuring instruments for measuring the dimensions of objects based on computer measurement technology have emerged. Typically, measuring instruments for measuring the dimensions of objects are image measuring instruments. Image measuring instruments generally include a measuring platform, a measuring lens, and a light source set at one end of the measuring lens and close to the measuring platform. The measuring lens acquires a surface image of the object to be measured, and then the surface image is analyzed based on image processing technology to obtain the dimensions of the object.

[0004] Generally, during the measurement of an object, it is necessary to control the movement of the measuring lens and / or the measuring platform to move the object into the visible area of ​​the measuring lens. However, improper operation during the measurement process may cause the light source and the measuring platform to collide, which may affect the measurement accuracy of the measuring lens or even damage it. Patent document (CN109489564A) discloses an image measuring instrument with automatic anti-collision function. In this patent document, an anti-collision monitoring structure is set to monitor whether the light source is collided. If the light source is collided, the anti-collision monitoring structure will obtain a collision signal and control the light source to retract to protect the measuring lens.

[0005] However, the aforementioned collision avoidance 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 separation of the conductive balls and conductive sheets controls the light source's retraction; after the light source has retracted a safe distance, the conductive balls and conductive sheets come into contact. The separation and contact process between the conductive balls and conductive sheets causes wear, thus requiring frequent maintenance of the conductive balls and conductive sheets. Summary of the Invention

[0006] This disclosure is made in view of the above-mentioned state of the prior art, and its purpose is to provide a protective device with a simple structure that can protect the measuring lens.

[0007] This disclosure provides a protective device for a measuring instrument, specifically a device for protecting the measuring lens of the measuring instrument during the 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 disposed on the measuring lens and guides 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 disposed on the sliding rod at the end of the measuring lens closer 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 emission signal of the photoelectric sensor when the floating portion moves relative to the guide portion. The photoelectric sensor generates 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.

[0008] In this scenario, during the measurement process, when the light source is subjected to external force, the floating part moves in a preset direction. The guide part guides the floating part to move in the preset direction, simultaneously moving the detector in the preset direction. When the detector blocks the invisible light path of the photoelectric sensor, it indicates that the floating part has moved a preset distance in the preset direction. At this point, the photoelectric sensor generates an electrical signal based on the detector blocking the emitted signal and sends the signal to the control unit. Based on the received electrical signal, the control unit controls the measuring lens to move away from the object being measured. The protection device achieves the purpose of intelligently protecting the measuring lens. Thus, the light source will not be further squeezed and damaged, thereby protecting the measuring lens from damage and maintaining the measurement accuracy of the measuring instrument.

[0009] Alternatively, in the protective device disclosed herein, the floating part may further include a first floating plate disposed on the outer 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 sliding rod can be installed between the first floating plate and the second floating plate using the first fixing block and the second fixing block.

[0010] Alternatively, in the protective device disclosed herein, the detector may be disposed on the second fixed block. In this case, the detector can remain relatively stationary with the second fixed block, that is, it can remain relatively stationary with the floating part. When the floating part moves a preset distance in a preset direction, the detector can move accordingly.

[0011] Alternatively, in the protective device disclosed herein, the light source can 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 an external force from or to the object under test, the floating part can move in a preset direction.

[0012] Alternatively, in the protective device disclosed herein, the guide portion may include a linear bearing, a bearing housing that matches the linear bearing, and a fixed plate connected to the bearing housing and located on the outer periphery of the measuring lens. The linear bearing cooperates with the sliding rod to allow the sliding rod to move relative to the guide portion. In this case, the guide portion can maintain a relatively fixed state relative to the measuring lens, thereby providing stable linear motion for the floating portion, and thus enabling the floating portion to move more stably within the guide portion.

[0013] Additionally, the protective device disclosed herein may optionally include an elastic member for maintaining the floating part with a tensile force in a direction opposite to the preset direction. One end of the elastic member is disposed on the first floating plate, and the other end of the elastic member is disposed on the fixed plate. In this case, during the measurement of the object to be measured, the elastic member can continuously provide a slight downward tensile force to the floating part. Even if the light source is impacted by abnormal factors, the tensile force of the elastic member can quickly return the floating part to its initial position, further ensuring the reliability of the measuring instrument.

[0014] Alternatively, in the protective device disclosed herein, the linear bearing may have a first groove surrounding the linear bearing for mounting a first elastic retaining ring and a second groove surrounding the linear bearing for mounting a second elastic retaining ring, the linear bearing being disposed on the bearing housing via the first elastic retaining ring and the second elastic retaining ring. In this case, by providing the first elastic retaining ring in the first groove and the second elastic retaining ring in the second groove, the linear bearing can be fixed to the bearing housing; in other words, with the above arrangement, the linear bearing will not move relative to the bearing housing.

[0015] Additionally, in the protective device disclosed herein, optionally, the floating part further includes a first rubber pad and a second rubber pad. 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, noise is reduced while vibration of the floating part caused by movement is also reduced, thereby further protecting the light source and the measuring lens.

[0016] Alternatively, in the protection device disclosed herein, the photoelectric sensor may be disposed on the bearing housing. This allows the photoelectric sensor to remain relatively stationary with respect to the bearing housing.

[0017] Additionally, in the protective device disclosed herein, the light source may optionally be a ring light source. In this case, it can provide illumination light from multiple directions to the object under test, maintaining stable brightness around the object. This allows the measuring lens to obtain more stable image information, which is beneficial for improving the imaging effect of image processing.

[0018] According to this disclosure, a protective device with a simple structure that can protect the measuring lens can be provided. Attached Figure Description

[0019] This disclosure will now be explained in further detail by way of example only with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram illustrating an application scenario of the measuring instrument involved in the examples of this disclosure.

[0021] Figure 2 This is a block diagram illustrating the structure of the measuring instrument involved in the example of this disclosure.

[0022] Figure 3 This is a three-dimensional schematic diagram showing the protective device and measuring lens involved in the example of this disclosure.

[0023] Figure 4 This is a schematic diagram showing a first-view perspective of the protective device and measuring lens involved in the example of this disclosure.

[0024] Figure 5 This is a partial enlarged cross-sectional view of the protective device involved in the example of this disclosure.

[0025] Figure 6 This is an exploded schematic diagram showing the protection device involved in the example of this disclosure.

[0026] Figure 7 This is a schematic diagram showing a second perspective of the protective device and measuring lens involved in the example of this disclosure.

[0027] Figure 8 This is a flowchart illustrating the protection method involved in the example of this disclosure. Detailed Implementation

[0028] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, the same reference numerals are used for the same components, and repeated descriptions are omitted. Furthermore, the drawings are merely schematic diagrams, and the proportions of the components or the shapes of the components may differ from actual figures.

[0029] It should be noted that the terms "comprising" 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 that are explicitly listed, but may include or have other steps or units that are not explicitly listed or that are inherent to such processes, methods, products, or equipment.

[0030] Additionally, it should be noted that the relative position and direction terms used in this article, such as "above", "facing upward", "below", "facing downward", "up and down direction", "left side", "facing left side", "left", "facing left side", "right side", "facing right side", "right side", "facing right side", "left and right direction", "front", "facing forward", "back", "facing backward", and "front and back direction", are based on the usual operating posture and should not be considered restrictive.

[0031] This disclosure relates to a protective device for a measuring instrument, which can be used to protect the measuring lens of the measuring instrument. The protective device of this embodiment can effectively reduce the probability of the light source colliding with the object being measured, thereby protecting the measuring lens and enabling the measuring instrument to maintain high measurement accuracy.

[0032] The protective device for measuring instruments involved in this embodiment can be simply referred to as a protective device. In some examples, the protective device may be called an anti-collision device, a buffer device, etc. It should be noted that the names are for the purpose of indicating the device for measuring instruments involved in this embodiment and should not be construed as limiting.

[0033] Figure 1 This is a schematic diagram illustrating an application scenario of the measuring instrument 1 involved in the example of this disclosure. Figure 2 This is a block diagram illustrating the structure of the measuring instrument 1 involved in the example of this disclosure.

[0034] The protective device 10 described in this embodiment can be applied to a measuring instrument 1 used to measure information about an object under test, such as measuring the two-dimensional dimensions, three-dimensional dimensions, and surface morphology of the object under test. In some examples, the measuring instrument 1 can be any instrument including a measuring lens 20 (described later), especially an instrument in which the measuring lens 20 needs to move in a direction perpendicular to the measuring platform 30. For example, the measuring instrument 1 can be an image measuring instrument, a white light interferometer, or a flash measuring instrument.

[0035] Hereinafter, taking an image measuring instrument as an example, the protection device 10 involved in this embodiment will be described. It should be noted that, for other measuring instruments 1, those skilled in the art can make slight modifications to the protection device 10 used in the image measuring instrument to protect the measuring lens 20 of other measuring instruments 1.

[0036] See Figure 1 The protective device 10 described in this embodiment can be applied to an image measuring instrument. In some examples, the image measuring instrument can perform two-dimensional coordinate measurement of the object under test.

[0037] In some examples, the measuring instrument 1 may include a measuring lens 20 and a measuring platform 30. The measuring lens 20 can be used to acquire image information of the object to be measured. The measuring platform 30 can be used to support the object to be measured.

[0038] In some examples, the measuring lens 20 may be roughly cylindrical.

[0039] In some examples, the measuring lens 20 may be close to the measuring platform 30 during the measurement of the object under test. The protective device 10 of this embodiment aims to reduce the probability of the light source 122 (described later) colliding with the measuring platform 30 and / or the object under test when the measuring lens 20 is close to the measuring platform 30. In this case, when measuring the object under test, the protective device 10 can protect the light source 122 from collision as much as possible, thereby protecting the measuring lens 20 from damage and maintaining 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 under test. In some examples, the protective device 10 also protects the light source 122. At the same time, the protective device 10 of this embodiment has a simple structure and is easy to implement.

[0040] See Figure 2 In some examples, the protective device 10 may include a guide portion 110, a floating portion 120, and a sensing portion 130. The guide portion 110 can be used to guide the movement of the floating portion 120. The floating portion 120 can be used to move a preset distance on the guide portion 110 when the light source 122 is subjected to an external force. The sensing portion 130 can be used to monitor the movement of the floating portion 120. In some examples, the protective device 10 may also include a control portion 140. The control portion can be used to control the movement of the measuring lens 20. In some examples, the control portion 140 may be automatic. In other examples, the control portion 140 may be manual.

[0041] In some examples, the preset distance may be related to the position set by the sensor 130.

[0042] Figure 3 This is a perspective view showing the protective device 10 and the measuring lens 20 involved in the example of this disclosure. Figure 4 This is a schematic diagram showing a first-view perspective of the protective device 10 and the measuring lens 20 involved in the example of this disclosure. Figure 5 This is a partial enlarged cross-sectional view of the protection device 10 involved in the example of this disclosure.

[0043] See Figure 3 In the protective device 10 according to this embodiment, the guide portion 110 may be provided on the measuring lens 20. For example, the guide portion 110 may be provided on the outer periphery of the measuring lens 20. In some examples, the guide portion 110 may be provided on the outer periphery of the measuring lens 20 and near one end of the measuring platform 30. In other examples, the guide portion 110 may be provided at any position on the outer periphery of the measuring lens 20.

[0044] In some examples, the guide 110 can be used to guide the floating part 120 to move in a preset direction D1. The preset direction D1 can be as follows: Figure 3 As shown in D1. In some examples, the preset direction D1 can be a direction perpendicular to the measuring platform 30. For example, if the measuring platform 30 is arranged horizontally, the preset direction D1 can be a vertical direction. In some examples, the preset direction D1 can be a direction parallel to the central axis of the measuring lens 20.

[0045] As described above, the guide portion 110 can be used to guide the movement of the floating portion 120. In some examples, when measuring the object to be measured, at least a portion of the floating portion 120 can be located between the measuring lens 20 and the object to be measured. If at least a portion of the floating portion 120 comes into contact with the object to be measured or is subjected to the pressure of the object to be measured, the floating portion 120 will move a preset distance in a preset direction D1 to move the measuring lens 20 away from the object to be measured. In some examples, at least a portion of the floating portion 120 can refer to the light source 122. In other examples, at least a portion of the floating portion 120 can include more components.

[0046] See Figure 4 and Figure 5 In some examples, the floating part 120 may include a sliding rod 121 and a light source 122. The sliding rod 121 can cooperate with the guide part 110 to movably position the floating part 120 on the guide part 110. The light source 122 can illuminate the object under test. Specifically, the light source 122 can provide illumination to the object under test and create an imaging effect that is beneficial for image processing, thereby improving image stability.

[0047] Figure 6 This is an exploded schematic diagram showing the protection device 10 involved in the example of this disclosure.

[0048] See Figure 6 In some examples, the sliding rod 121 may be cylindrical. This results in less frictional resistance during the movement of the sliding rod 121, making its movement smoother. In some examples, the sliding rod 121 may have threaded holes at both ends. In this case, the sliding rod 121 can be connected to other components of the floating part 120 (described in detail later) through the engagement of the threaded holes.

[0049] In some examples, the floating part 120 may include a plurality of sliding rods 121. For example, it may include, for instance, a plurality of sliding rods 121. Figure 6 The sliding rods 121a and 121b are shown. In other examples, the floating part 120 may include multiple sliding rods 121, such as 3, 4, 5, or 6. When the floating part 120 includes multiple sliding rods 121, the multiple sliding rods 121 can be arranged symmetrically around the outer periphery of the measuring lens 20, and the guide part 110 may also include multiple sliding tracks that match the multiple sliding rods 121. In this case, when the floating part 120 moves, it can maintain a higher balance to protect the measuring lens 20 from collisions as much as possible. In other examples, the multiple sliding rods 121 may not be arranged symmetrically.

[0050] In some examples, the floating part 120 may also include a first fixing block 123 and a second fixing block 124. For ease of description, the two ends of the sliding rod 121 can be designated as a first end and a second end, respectively. The first fixing block 123 can be disposed at the first end, and the second fixing block 124 can be disposed at the second end.

[0051] 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 can be fixed to the first end by a first fixing member, and the second fixing block 124 can be fixed to the second end by a second fixing member. The first fixing member and the second fixing member can 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.

[0052] In some examples, the first fixing block 123 and the second fixing block 124 may have the same shape and height. For example, they may be roughly cylindrical, prismatic, or other columnar shapes with irregular shapes.

[0053] In some examples, when the floating part 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. See Figure 6 The floating part 120 may include two sliding rods 121. Specifically, it may include sliding rod 121a and sliding rod 121b. In this case, the floating part 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.

[0054] See Figure 6 In some examples, the floating part 120 may further include a first floating plate 127 disposed on the outer 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 installed between the first floating plate 127 and the second floating plate 128 using the first fixing block 123 and the second fixing block 124.

[0055] 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 the multiple sliding rods 121 to be synchronized.

[0056] In some examples, the floating part 120 may further include a first floating plate 127. The first floating plate 127 can be used to connect a plurality of first fixed blocks 123. Thus, the plurality of sliding rods 121 can have synchronous movement. The first floating plate 127 can be disposed on the outer periphery of the measuring lens 20. Specifically, the first floating plate 127 can have an inner surface that matches the outer surface of the measuring lens 20. Thus, the first floating plate 127 can have a high degree of matching with the measuring lens 20. In some examples, the floating part 120 may further include a second floating plate 128. The second floating plate 128 can be used to connect a plurality of second fixed blocks 124. The second floating plate 128 can be disposed on the outer periphery of the measuring lens 20. Specifically, the second floating plate 128 can have an inner surface that matches the outer surface of the measuring lens 20. Thus, the second floating plate 128 can have a high degree of matching with the measuring lens 20.

[0057] In some examples, the first fixing block 123 and the first floating plate 127 may be connected together by welding or gluing. In other examples, the first fixing block 123 and the first floating plate 127 may be integrally formed. In some examples, the second fixing block 124 and the second floating plate 128 may be connected together by welding, gluing, or snap-fitting. In other examples, the second fixing block 124 and the second floating plate 128 may be integrally formed.

[0058] In some examples, the light source 122 can be disposed on the sliding rod 121 and located at the end of the measuring lens 20 near the object to be measured. In some examples, the light source 122 can be connected to the second fixing block 124. That is, the light source 122 can be connected to the sliding rod 121 through the second fixing block 124. In this case, the light source 122 can be fixed to the sliding rod 121, and if the bottom of the light source 122 is subjected to an external force from the measuring platform 30 and / or the object to be measured, the floating part 120 can move in a preset direction D1.

[0059] In some examples, when measuring the object to be measured, the light source 122 can be located between the measuring lens 20 and the object to be measured. Alternatively, the light source 122 can be located between the measuring lens 20 and the measuring platform 30. In some examples, the light source 122 can be located between the measuring lens 20 and the measuring platform 30 regardless of whether the object to be measured is being measured. When the bottom of the light source 122 (i.e., the portion near the measuring platform 30 and / or the object to be measured) is subjected to an external force, it can be considered that the light source 122 is being squeezed against the measuring platform 30 and / or the object to be measured. At this time, the floating part 120 will move a preset distance in a preset direction D1 to protect the light source 122 from further squeezing, thereby protecting the measuring lens 20.

[0060] In some examples, the light source 122 may be provided with a feedback travel. Within the feedback travel, the light source 122 may have a self-protection mechanism. In this case, even if the light source 122 is subjected to external pressure, it will not be damaged. The protective device 10 according to this embodiment can protect the light source 122 from further pressure, that is, it can prevent the light source 122 from being pressured outside the feedback travel. Thus, the measuring lens 20 can be protected while protecting the light source 122.

[0061] As described above, the sliding rod 121 may be equipped with a light source 122. In other words, in some examples, the light source 122 may be located 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 the interference of ambient brightness to maintain stable brightness around the object under test. In this case, the measuring lens 20 can obtain more stable image information, which is beneficial to improving the imaging effect of image processing, and thus reducing the complexity of the computing system of the measuring instrument 1.

[0062] In some examples, the light source 122 can be a ring light source. The light source 122 can have a bottom light source and side light sources surrounding it. In this case, it can provide illumination from multiple directions to the object under test, maintaining stable brightness around the object. This allows the measuring lens 20 to obtain more stable image information, which is beneficial for improving the imaging effect of image processing. In some examples, the bottom light source can be circular, rectangular, or any irregular shape. In some examples, the bottom light source can have a through-hole through which the measuring lens 20 passes. Thus, the measuring lens 20 can pass through the bottom light source and obtain stable image information of the object under test under the illumination of the light source 122.

[0063] As described above, the guide portion 110 can be used to guide the floating portion 120 to move in a preset direction D1. In some examples, a sliding rod 121 can be provided on the guide portion 110. In other examples, the sliding rod 121 can be provided on the guide portion 110 in a manner that allows it to move relative to the guide portion 110.

[0064] In some examples, the guide portion 110 may include a sliding track arranged in a preset direction D1. Thus, the guide portion 110 is able to provide a guide trajectory in the preset direction D1. In some examples, the sliding track can provide linear motion. In other examples, the sliding track can provide curvilinear motion.

[0065] Specifically, in some examples, the guide portion 110 may include a linear bearing 111 and a bearing housing 112 that matches the linear bearing 111. The linear bearing 111 can be a system that provides linear motion. In some examples, the linear motion provided by the linear bearing 111 can have lower frictional resistance and more precise and smoother linear motion. Thus, the floating portion 120 can move more stably within the guide portion 110. In some examples, the linear bearing 111 may be a cylindrical shaft.

[0066] In some examples, the linear bearing 111 can be disposed in the bearing housing 112. Specifically, in some examples, the linear bearing 111 can have a first groove 114 surrounding the linear bearing 111 for mounting a first elastic retaining ring 116 and a second groove 115 surrounding the linear bearing 111 for mounting a second elastic retaining ring 117. The linear bearing 111 can be disposed in the bearing housing 112 via the first elastic retaining ring 116 and the second elastic retaining ring 117. In this case, by providing the first elastic retaining ring 116 in the first groove 114 and the second elastic retaining ring 117 in the second groove 115, the linear bearing 111 can be fixed to the bearing housing 112. In other words, with the above arrangement, the linear bearing 111 will not move relative to the bearing housing 112.

[0067] As described above, the guide portion 110 may include a plurality of sliding tracks that mate with the plurality of sliding rods 121. See also Figure 6 In some examples, the guide portion 110 may include two sliding tracks. Specifically, it may include a linear bearing 111a and a bearing housing 112a that matches the linear bearing 111, and a linear bearing 111b and a bearing housing 112b that matches the linear bearing 111. The relevant mating and connection relationships can be as described above, and will not be repeated here.

[0068] Figure 7 This is a schematic diagram showing a second perspective of the protective device 10 and the measuring lens 20 involved in the example of this disclosure.

[0069] In some examples, the measuring instrument 1 may also include a clamping fixture 40 for securing the measuring lens 20. See also 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 the 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 the end of the measuring lens 20 close 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 on the outer periphery of the measuring lens 20. In some examples, the second fixing seat 430 and the second clamping block 440 may be fixed to the Z-axis moving part (described later).

[0070] In some examples, the guide portion 110 may also include a fixing plate 113. The fixing plate 113 may be connected to the bearing housing 112 and is located on the outer periphery of the measuring lens 20. In some examples, the fixing plate 113 may be used to connect multiple bearing housings 112, for example, bearing housings 112a and 112b may be connected (see...). Figure 6 In other examples, bearing housings 112a and 112b and fixing plate 113 may be integrally formed. In some examples, fixing plate 113 may be fixed to fixing base 410 for clamping measuring lens 20. In this case, guide portion 110 can remain relatively fixed relative to measuring lens 20, thereby providing stable linear motion for floating portion 120.

[0071] As described above, the second fixing base 430 and the second clamping block 440 can be fixed to the Z-axis moving part. In some examples, the Z-axis moving part can move in a preset direction D1 and in a direction opposite to the preset direction D1. The measuring lens 20 can be fixed to the Z-axis moving part by the second fixing base 430 and the second clamping block 440. The movement of the Z-axis moving part can drive the measuring lens 20 to move, for example, closer to or further away from the object to be measured.

[0072] In some examples, the second mounting base 430 and the second clamping block 440 can be fixed to any component that is stationary relative to the Z-axis moving part.

[0073] In some examples, the bearing housing 112 can be fixedly connected to the second fixed base 430. In other words, during the movement of the measuring lens 20, the bearing housing 112 and the measuring lens 20 may not move relative to each other.

[0074] In some examples, the second mounting base 430 and the second clamping block 440 may be included in the guide portion 110. In this case, the second mounting base 430 can provide a stable base for the mounting of the linear bearing 111 and the bearing housing 112, thereby preventing relative movement between the bearing housing 112 and the measuring lens 20.

[0075] In some examples, the linear bearing 111 may 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, thereby allowing the floating portion 120 to move relative to the guide portion 110.

[0076] See Figure 5 and Figure 6 In some examples, the floating part 120 may further include a first rubber pad 125 and a second rubber pad 126. Both the first rubber pad 125 and the second rubber pad 126 may be disposed on the outer periphery of the sliding rod 121. In some examples, the first rubber pad 125 and the second rubber pad 126 can be used to reduce the vibration of the floating part 120 during movement, i.e., they can serve as shock absorbers. In some examples, the first rubber pad 125 and the second rubber pad 126 can also reduce the noise generated by the floating part 120 during movement, i.e., they can serve as noise reducers. When multiple sliding rods 121 are included, multiple first rubber pads 125 and multiple second rubber pads 126 that match the multiple sliding rods 121 may also be included, which will not be elaborated further here.

[0077] In some examples, a first rubber pad 125 may 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 a second rubber pad 126 may 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, noise is reduced while the vibration of the floating part 120 caused by the movement is minimized, thereby further protecting the light source 122 and the measuring lens 20.

[0078] As described above, the protection device 10 according to this embodiment also includes a sensing unit 130. The sensing unit 130 can be used to monitor whether the floating unit 120 moves. In some examples, the sensing unit 130 may 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. In addition, the photoelectric sensor 131 can also be used to receive the transmission signal blocked by the detector 132.

[0079] In some examples, the photoelectric sensor 131 can be any device capable of emitting optical signals, radar signals, or electronic signals. For example, the photoelectric sensor 131 can be a photoelectric switch. In some examples, the emitted signal can be an optical signal, radar signal, or electronic signal. In some examples, the detector 132 can be any device capable of reflecting (or blocking) any of the above-mentioned signals. The detector 132 can also be called a light blocker.

[0080] In the protection device 10 of this embodiment, the photoelectric sensor 131 can generate an electrical signal based on the detector 132 blocking the emitted signal and send the electrical signal to the control unit 140 so that the control unit 140 controls the measuring lens 20 to move away from the object to be measured. For example, in some examples, the detector 132 can block the invisible light path of the photoelectric sensor 131, so that the photoelectric sensor 131 emits different high or low frequency electrical signals to the control unit 140. The control unit 140 receives the corresponding electrical signal and can control the measuring lens 20 to move away from the object to be measured, thereby protecting the measuring lens 20 and ensuring the safety and reliability of the measurement process.

[0081] In some examples, the photoelectric sensor 131 may be disposed on the guide portion 110. In some examples, the detector 132 may 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 emission signal of the photoelectric sensor 131. In other words, the detector 132 can be disposed on the floating portion 120 and block the emission signal of the photoelectric sensor 131 when the floating portion 120 moves relative to the guide portion 110. Thus, it is possible to determine that the floating portion 120 has moved relative to the guide portion 110 based on the detector 132 blocking the emission signal. Specifically, as described above, in some examples, the detector 132 can block the invisible light path of the photoelectric sensor 131, causing the photoelectric sensor 131 to emit different high or low frequency electrical signals to the control unit 140.

[0082] like Figure 7 As shown, in some examples, the photoelectric sensor 131 can be disposed on the bearing housing 112. Thus, the photoelectric sensor 131 can remain relatively stationary with respect to the bearing housing 112.

[0083] In some examples, the detector 132 can be disposed on the second fixed block 124. In this case, the detector 132 can remain relatively stationary with respect to the second fixed block 124, that is, it can remain relatively stationary with respect to the floating part 120. When the floating part 120 moves a preset distance in a preset direction D1, the detector 132 can move accordingly. In other examples, the detector 132 can also be disposed on any component of the floating part 120.

[0084] In this embodiment, the photoelectric sensor 131 can generate an electrical signal based on the detector 132 blocking the emitted signal. The protection device 10 can control the measuring lens 20 to move away from the object to be measured based on the electrical signal. Specifically, in some examples, the protection device 10 may also include a control unit 140. The control unit 140 can be used to control the measuring lens 20 to move away from or closer to the object to be measured. For example, when measuring the object to be measured, the control unit 140 can control the measuring lens 20 to move closer to the object to be measured so that the object to be measured enters the measurement field of view of the measuring lens 20. After the measurement is completed, the control unit 140 can control the measuring lens 20 to move away from the object to be measured. In some examples, the control unit 140 can also control the measuring lens 20 to move away from the object to be measured when the light source 122 is hit. In other words, when the floating part 120 moves a preset distance in a preset direction D1, the control unit 140 can control the measuring lens 20 to move away from the object to be measured.

[0085] In some examples, the photoelectric sensor 131 can send an electrical signal to the control unit 140. The control unit 140 can control the measuring lens 20 to move away from the object under test based on the received electrical signal. Thus, the protection device 10 can protect the measuring lens 20. In some examples, controlling the measuring lens 20 to move away from the object under test also controls the light source 122 to move away from the object under test.

[0086] In some examples, the protective device 10 may further include an elastic member 150 for maintaining the floating part 120 with a tension force in the direction opposite to the preset 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 preset direction D1 may be a vertically downward direction. In this case, during the measurement of the object to be measured, the elastic member 150 can continuously provide a light downward tension force to the floating part 120. Even if the light source 122 is impacted by abnormal factors, the tension force of the elastic member 150 can quickly return the floating part 120 to its initial position, further ensuring the reliability of the measuring instrument 1.

[0087] In some examples, the initial position can be the position when the floating part 120 has not moved.

[0088] In some examples, if the protective device 10 includes only a sliding rod 121, then 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 also include an elastic member 150 for maintaining the floating part 120 with a tension in a preset direction D1 (some drawings use simplified drawing methods for clarity). If the protective device 10 includes only a 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.

[0089] Figure 8 This is a flowchart illustrating the protection method involved in the example of this disclosure.

[0090] This embodiment also discloses a method for protecting the measuring lens 20. See [link to previous document]. 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 part 120 moves in a preset direction D1 (step S200), the sensing part 130 monitors the movement signal of the floating part 120, and in response to the sensing part 130 monitoring the movement signal of the floating part 120, sends an electrical signal to the control part 140 (step S400), and the control part 140 controls the measuring lens 20 to move away from the measuring platform 30 (step S600).

[0091] According to this disclosure, when the measuring instrument 1 measures the information of 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 when the measuring lens 20 approaches the object to be measured, the floating part 120 will move in the preset direction D1. When the detector 132 blocks the invisible light path of the photoelectric sensor 131, it indicates that the floating part 120 has moved in the preset direction D1. At this time, the photoelectric sensor 131 can generate an electrical signal based on the detector 132 blocking the transmission signal 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 protection 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.

[0092] While the disclosure has been specifically described above in conjunction with the accompanying drawings and examples, it is to be understood that the foregoing description does not limit the disclosure in any way. Those skilled in the art can make modifications and variations to the disclosure as needed without departing from its essential spirit and scope, and all such modifications and variations shall fall within the scope of the disclosure.

Claims

1. A collision avoidance device for measuring instruments, characterized in that, The anti-collision device includes a guide part and a floating part. The guide part is disposed on the outer periphery of the measuring lens of the measuring instrument and is used to guide the floating part to move in a preset direction. The floating part includes a sliding rod and a light source disposed on the sliding rod and located at the end of the measuring lens near the object to be measured. The sliding rod is disposed on the guide part in a manner that allows it to move relative to the guide part. When the light source is subjected to an undesirable force, the floating part moves a preset distance away from the object to be measured in the preset direction relative to the guide part.

2. The anti-collision device according to claim 1, characterized in that, The floating part includes a first fixing block and a second fixing block respectively disposed at both ends of the sliding rod. The first fixing block and the second fixing block are configured to cooperate with the guide part to limit the movement distance of the floating part. The light source and the sliding rod are connected through the second fixing block.

3. The anti-collision device according to claim 1, characterized in that, The floating part further includes a first floating plate disposed on the outer 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. The light source is connected to the sliding rod through the second fixing block.

4. The anti-collision device according to claim 2, characterized in that, The guide portion includes a linear bearing and a bearing housing that matches the linear bearing, and the sliding rod is configured to move along the linear bearing.

5. The anti-collision device according to claim 3, characterized in that, The guide portion includes a linear bearing, a bearing housing that matches the linear bearing, and a fixed plate connected to the bearing housing and located on the outer periphery of the measuring lens. The linear bearing cooperates with the sliding rod to allow the sliding rod to move relative to the guide portion.

6. The anti-collision device according to claim 4 or 5, characterized in that, The linear bearing has a first groove surrounding the linear bearing and for mounting a first elastic retaining ring, and a second groove surrounding the linear bearing and for mounting a second elastic retaining ring, the linear bearing being disposed on the bearing housing via the first elastic retaining ring and the second elastic retaining ring.

7. The anti-collision device according to claim 4 or 5, characterized in that, The floating part further includes a first rubber pad and a second rubber pad. 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. 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.

8. The anti-collision device according to claim 1, characterized in that, It also includes a sensing unit, which includes a photoelectric sensor disposed on the guide portion and a detector disposed on the floating portion and used to block the emission signal of the photoelectric sensor when the floating portion moves relative to the guide portion. The measuring lens is controlled to move away from the object to be measured based on the electrical signal generated by the detector blocking the emission signal.

9. The anti-collision device according to claim 8, characterized in that, The floating part includes a second fixing block disposed at one end of the sliding rod and used to connect the light source and the sliding rod, and the detector is disposed on the second fixing block; The guide portion includes a linear bearing configured to move the sliding rod along a preset direction and a bearing housing that matches the linear bearing, and the photoelectric sensor is disposed in the bearing housing.

10. A measuring instrument, characterized in that, The measuring instrument includes a support platform for carrying the object to be measured, a measuring lens for measuring the object to be measured, and an anti-collision device as described in any one of claims 1 to 9.

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