High-precision sensor detection mechanism

Abstract

The invention belongs to the field of industrial automatic detection, and particularly relates to a high-precision sensor detection mechanism which comprises a sensor protection shaft, a high-precision distance measuring sensor, a guide shaft sleeve and a transition block. The sensor protection shaft is of a hollow shaft-shaped structure; the high-precision distance measuring sensor is fixedly arranged in an inner cavity of the sensor protection shaft in the axial direction, and a measuring head of the high-precision distance measuring sensor faces the lower end of the sensor protection shaft. The guide shaft sleeve is coaxially arranged at the lower part of the inner cavity of the sensor protection shaft, and the lower end surface of the guide shaft sleeve is flush with or basically flush with the lower end surface of the sensor protection shaft; the transition block is sleeved in the guide shaft sleeve in an axial sliding manner, the lower end face of the transition block extends out of the guide shaft sleeve and the lower end face of the sensor protection shaft, and a preset gap is formed between the upper end face of the transition block and the measuring head. The slidable transition block is used for replacing a sensor measuring head to directly contact with a measured surface, so that pollutants such as oil stain and dust are effectively isolated, and the measuring head is kept clean and the measuring precision is kept.

Description

Technical Field

[0001] This invention belongs to the field of industrial automation testing, and more specifically, it relates to a high-precision sensor testing mechanism. Background Technology

[0002] In the field of industrial automation inspection, high-precision ranging sensors (such as laser ranging sensors and contact displacement sensors) are widely used in key processes such as workpiece size measurement, position positioning, and surface topography inspection. These sensors typically have measurement accuracy at the micrometer or even sub-micrometer level, but their probes often need to be in direct contact with or close to the surface of the workpiece being measured to ensure the accuracy and reliability of the measurement data.

[0003] However, in actual industrial environments, especially in machining, assembly, stamping, and welding processes, workpiece surfaces are often contaminated with oil, cutting fluid, metal shavings, dust, and other pollutants. If the sensor probe is in direct contact with such surfaces for extended periods, these contaminants can easily adhere and accumulate, leading to increased measurement errors, decreased response speed, and even damage to the sensor's optical window or sensitive elements, severely impacting its lifespan and measurement stability. Furthermore, during production, due to mechanical vibration, workpiece positioning deviations, or human error, the sensor probe is also susceptible to accidental impacts or pressure, which can cause measurement errors or, in severe cases, deformation of the sensor's mechanical structure or damage to internal components.

[0004] Existing protection technologies mostly focus on a single function, making it difficult to simultaneously provide protection against contamination, impacts, and overloads under complex operating conditions. Furthermore, they are rarely designed in conjunction with the sensor's own measurement range, meaning that the sensor may still be damaged due to exceeding its range in the event of a severe collision. Therefore, there is an urgent need for a sensor detection mechanism that is compact, does not compromise measurement accuracy, and provides comprehensive and reliable protection. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a high-precision sensor detection mechanism to resolve the issues present in the background art.

[0006] The purpose and effectiveness of the high-precision sensor detection mechanism of this invention are achieved by the following specific technical means: A high-precision sensor detection mechanism includes a sensor protection shaft, a high-precision ranging sensor, a guide sleeve, and a transition block; The sensor protection shaft is a hollow shaft-shaped structure. The high-precision ranging sensor is fixedly installed axially in the inner cavity of the sensor protection shaft, with its probe facing the lower end of the sensor protection shaft; The guide bushing is coaxially disposed in the lower part of the inner cavity of the sensor protection shaft, and its lower end face is flush or substantially flush with the lower end face of the sensor protection shaft. The transition block is axially slidably fitted inside the guide sleeve, with its lower end face extending beyond the lower end face of the guide sleeve and the sensor protection shaft, and its upper end face having a preset gap with the probe.

[0007] Preferably, it further includes a steel back bushing, which is fixedly disposed on the upper part of the inner cavity of the sensor protection shaft, and the high-precision ranging sensor is inserted through the steel back bushing.

[0008] Preferably, it also includes a first set screw, and the side wall of the sensor protection shaft has a first threaded hole. The first set screw is screwed into the first threaded hole and abuts against the high-precision ranging sensor to fix it axially.

[0009] Preferably, it also includes a second set screw, and the side wall of the sensor protection shaft has a second threaded hole. The second set screw is screwed into the second threaded hole and abuts against the guide sleeve to fix it.

[0010] Preferably, the guide bushing has a self-lubricating function.

[0011] Preferably, the transition block is a stepped shaft structure with a large diameter at the upper end and a small diameter at the lower end, with the larger end of the shaft diameter located inside the guide sleeve.

[0012] Preferably, when the lower end face of the transition block is flush with the lower end face of the sensor protection shaft, the upper end face of the transition block is within the effective measurement range of the high-precision ranging sensor.

[0013] Compared with the prior art, the present invention has the following beneficial effects: By replacing the sensor probe with a sliding transition block that directly contacts the measured surface, contaminants such as oil and dust are effectively isolated, maintaining probe cleanliness and measurement accuracy. Simultaneously, the cooperation between the transition block, the sensor protection shaft, and the guide bushing prevents accidental impacts to the probe by tools or workpieces during routine maintenance. Furthermore, in the event of a hard collision due to equipment failure, the structural limit ensures that the displacement of the transition block remains within the sensor's effective range, preventing sensor damage due to overload. The overall structure is compact and reliable, the guide bushing ensures smooth sliding, and the set screw fixing method facilitates assembly and maintenance, achieving comprehensive protection for high-precision ranging sensors in complex industrial environments. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the high-precision sensor detection mechanism of the present invention in a free state; Figure 2 This is a schematic diagram of the high-precision sensor detection mechanism of the present invention in the detection state; Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle; In the picture: 1. Sensor protection shaft; 2. High-precision ranging sensor; 2.1. Sensor probe; 3. Steel back bushing; 4.1. First set screw; 4.2. Second set screw; 5. Guide bushing; 6. Transition block. Detailed Implementation

[0015] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0016] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] Figures 1 to 3 A specific embodiment of a high-precision sensor detection mechanism according to the present invention is shown. For example... Figure 2 As shown, the detection mechanism mainly includes a sensor protection shaft 1, a high-precision distance sensor 2, a steel backing sleeve 3, a first set screw 4.1, a second set screw 4.2, a guide sleeve 5, and a transition block 6.

[0018] The sensor protection shaft 1 is a hollow stepped shaft structure with one open end and one closed end, and its inner cavity is used to accommodate other components. First, the steel backing sleeve 3 is pressed into the upper part of the inner cavity of the sensor protection shaft 1 (i.e., the closed end side). Then, the high-precision ranging sensor 2 is inserted into the open end of the sensor protection shaft 1, and one end of its probe 2.1 passes through the steel backing sleeve 3 and extends into the lower part of the inner cavity. After adjusting the axial position of the high-precision ranging sensor 2 to the predetermined position, the first set screw 4.1 on the side wall of the sensor protection shaft 1 is tightened, so that its end presses against the outer shell of the high-precision ranging sensor 2, thus achieving its firm fixation.

[0019] The transition block 6 is a stepped shaft-shaped part that has undergone precision machining and heat treatment. Its upper end (the end with the larger shaft diameter) has a precision sliding fit with the inner hole of the guide sleeve 5. During assembly, first insert the transition block 6 with the smaller shaft diameter end facing down into the guide sleeve 5. Then, insert this assembly from the open end of the sensor protection shaft 1 until the lower end face of the guide sleeve 5 is flush with the lower end face of the sensor protection shaft 1. At this point, tighten the second set screw 4.2 on the side wall of the sensor protection shaft 1, causing its end to press against the outer wall of the guide sleeve 5, thus fixing the guide sleeve 5 in place. After installation, the transition block 6 can slide freely and smoothly along the axial direction within the guide sleeve 5, with its lower end face protruding beyond the lower end face of the sensor protection shaft 1.

[0020] Figure 1 The diagram shows the mechanism in its free state. At this time, the transition block 6 is in a free-hanging position under the action of gravity, and its upper end face maintains a certain initial gap with the probe 2.1 of the high-precision distance sensor 2. The sensor outputs a basic signal value.

[0021] During measurement, the entire mechanism is moved so that the lower end face of the transition block 6 contacts the surface of the workpiece being measured. Under the action of the contact force, the transition block 6 is pushed upward and slides upward within the guide sleeve 5. When the upper end face of the transition block 6 just contacts the sensor probe 2.1 (see...), the measurement is completed. Figure 2 and Figure 3 (As shown in the diagram), this position is set as the mechanical zero point of the high-precision ranging sensor 2 and electrically zeroed. Afterward, any minute undulations on the workpiece surface will cause the transition block 6 to produce a corresponding displacement, which is directly transmitted to the probe 2.1. The sensor can then accurately measure this displacement, i.e., the change in the workpiece surface.

[0022] The core protection mechanism of this invention is reflected in two aspects: First, throughout the entire measurement process, the lower end face of the transition block 6 is always in contact with the measured surface, completely isolating contaminants such as oil and debris from direct contact with the precision probe 2.1, thus achieving anti-contamination protection. Second, overload protection is achieved through structural design. Specifically, the design ensures that when the transition block 6 slides upward from its free-falling position (zero point) until its lower end face is completely flush with the lower end face of the sensor protection shaft 1 (i.e., the limit position where the mechanism can withstand the maximum possible mechanical collision), the total displacement generated by the transition block 6 is still strictly less than the effective measurement range of the high-precision ranging sensor 2 itself. Therefore, even in the extreme case of abnormal hard collision caused by equipment failure, the sensor's sensitive element will not be damaged due to excessive displacement.

[0023] The guide bushing 5 is preferably made of engineering plastics with self-lubricating properties (such as polytetrafluoroethylene, oil-impregnated bearings, etc.) to ensure that the transition block 6 slides smoothly for a long time without the need for additional lubrication and to avoid lubricant contamination. The fixing method of the set screws (4.1, 4.2) makes the assembly, disassembly and subsequent maintenance of each component (such as replacing the transition block 6 or the guide bushing 5) very simple.

[0024] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high-precision sensor detection mechanism, characterized in that, It includes a sensor protection shaft (1), a high-precision ranging sensor (2), a guide bushing (5), and a transition block (6); The sensor protection shaft (1) is a hollow shaft structure; The high-precision ranging sensor (2) is fixedly installed in the inner cavity of the sensor protection shaft (1) along the axial direction, with its probe (2.1) facing the lower end of the sensor protection shaft (1); The guide bushing (5) is coaxially disposed in the lower part of the inner cavity of the sensor protection shaft (1), and its lower end face is flush or substantially flush with the lower end face of the sensor protection shaft (1). The transition block (6) is axially slidably fitted inside the guide sleeve (5), with its lower end face extending out of the guide sleeve (5) and the lower end face of the sensor protection shaft (1), and its upper end face having a preset gap with the probe (2.1).

2. The high-precision sensor detection mechanism according to claim 1, characterized in that, It also includes a steel back bushing (3), which is fixedly installed on the upper part of the inner cavity of the sensor protection shaft (1), and the high-precision ranging sensor (2) is inserted in the steel back bushing (3).

3. The high-precision sensor detection mechanism according to claim 2, characterized in that, It also includes a first set screw (4.1), and the side wall of the sensor protection shaft (1) is provided with a first threaded hole. The first set screw (4.1) is screwed into the first threaded hole and abuts against the high-precision ranging sensor (2) to fix it axially.

4. The high-precision sensor detection mechanism according to claim 1, characterized in that, It also includes a second set screw (4.2), and the side wall of the sensor protection shaft (1) is provided with a second threaded hole. The second set screw (4.2) is screwed into the second threaded hole and abuts against the guide sleeve (5) to fix it.

5. The high-precision sensor detection mechanism according to claim 1, characterized in that, The guide bushing (5) has a self-lubricating function.

6. The high-precision sensor detection mechanism according to claim 1, characterized in that, The transition block (6) is a stepped shaft structure with a large diameter at the upper end and a small diameter at the lower end, with the larger end of its shaft diameter located inside the guide sleeve (5).

7. The high-precision sensor detection mechanism according to any one of claims 1 to 6, characterized in that, When the lower end face of the transition block (6) is flush with the lower end face of the sensor protection shaft (1), the upper end face of the transition block (6) is within the effective measurement range of the high-precision ranging sensor (2).

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