A dial gauge testing device

Abstract

The utility model relates to the technical field of measurement and detection, concretely to a dial gauge calibrating device, including base and dial gauge body, the one side of base top is equipped with the interface mechanism for installing dial gauge body and adjusting its height, and the base below dial gauge body is equipped with the calibrating piece with its measurement end contact, the cross section of calibrating piece is round, and the top of calibrating piece is inclined plane, the base below calibrating piece is equipped with the adjusting mechanism for controlling its rotation and self -locking, through setting calibrating piece, adjusting mechanism and indicating component, utilize worm gear high transmission ratio characteristic to realize the trace control of calibrating piece rotation angle, cooperate the visual positioning of scale groove and indicating component, and each scale groove corresponds only standard height, can accurate locking target calibrating height, avoid the positioning error that traditional calibrating block replaced or manual regulation brought, ensure the accuracy of dial gauge body measurement end telescopic amount, and then promote the precision of the result of calibration.

Description

Technical Field

[0001] This utility model relates to the field of metrology and testing technology, and in particular to a dial gauge calibration device. Background Technology

[0002] The dial indicator calibration device is a core metrological device used in the field of metrology and testing to calibrate the accuracy of dial indicators (including lever dial indicators and internal diameter dial indicators). By generating a standard displacement and comparing it with the dial indicator's measured value, it verifies key indicators such as the dial indicator's indication error, hysteresis error, and repeatability, ensuring the reliability of its measurement results.

[0003] A dial indicator calibration device disclosed in Chinese Patent Publication No. CN216012002U uses a measuring head of the dial indicator to abut against a calibration block to zero the dial indicator. A plastic movable block is attached to the outer surface of the measuring rod, facilitating upward movement of the measuring rod. Moving the calibration block allows the measuring head to measure calibration pits at different depths, which can be used to determine the accuracy of the dial indicator after calibration. This eliminates the need for calibration blocks of different heights, making operation simpler and more convenient. However, based on existing dial indicator calibration devices and technologies, current devices often employ multiple fixed-height calibration blocks, a simple manual adjustment frame, and multiple calibration pits. Replacing calibration blocks and pits requires repositioning and zero-point calibration, which can easily lead to installation and contact deviations. Manual adjustment frames (such as micrometer screw gauges) lack a high-ratio precision transmission mechanism, making it difficult to accurately correspond rotation angles and height changes, hindering micro-adjustment and resulting in low precision control of the dial indicator's measuring end extension and retraction, leading to significant errors in the calibration results. Summary of the Invention

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art, solve the problems mentioned in the background art, and provide a dial indicator calibration device.

[0005] The objective of this utility model is achieved through the following technical solution: a dial indicator calibration device, comprising a base and a dial indicator body, wherein a connecting mechanism for mounting the dial indicator body and adjusting its height is installed on one side of the top of the base, and a calibration component for contacting its measuring end is provided below the dial indicator body on the base, the calibration component having a circular cross-section and a sloping top; an adjustment mechanism for controlling the rotation and self-locking of the calibration component is provided below the calibration component on the base, and multiple scale grooves are provided on the outer surface of the calibration component, and an indicator component is provided on the base to precisely adjust the rotation angle of the calibration component in cooperation with the scale grooves.

[0006] Preferably, the adjustment mechanism includes a splined shaft rotatably disposed on the top of the base, a worm gear is splinedly connected to the outer surface of the splined shaft, a worm is meshed with the outer surface of the worm gear, and the worm is rotatably disposed on the top of the base.

[0007] Preferably, the calibration piece has a insertion hole at the middle of its bottom, and the calibration piece is splined to the spline shaft through the insertion hole. A screw is rotatably provided at the center of the calibration piece, and the screw passes through the calibration piece and is threaded to the spline shaft.

[0008] Preferably, the indicating component includes a sleeve fixedly disposed on the top of the base, a pointer slidably disposed inside the sleeve, and a spring disposed between the bottom end of the pointer and the bottom surface inside the sleeve.

[0009] Preferably, the top of the pointer is provided with two chamfers symmetrically, and the chamfers of the pointer cooperate with the scale groove.

[0010] Preferably, the base is fixedly mounted with mounting seats at both ends corresponding to the worm gear, the worm gear is rotatably engaged with the mounting seats, and a knob is fixedly provided at one end of the worm gear, the knob being located on the outside of the base.

[0011] Preferably, the calibration piece has a countersunk hole corresponding to the position of the screw head, and a through hole corresponding to the thread of the screw. The through hole, the countersunk hole, and the insertion hole are connected. A threaded hole adapted to the screw is formed at the center of the top of the spline shaft.

[0012] The beneficial effects of this dial indicator calibration device are as follows: by setting up calibration pieces, adjustment mechanisms, and indicating components, the device utilizes the high transmission ratio characteristics of worm gears to achieve micro-quantitative control of the rotation angle of the calibration pieces. Combined with the visual positioning of the scale grooves and indicating components, each scale groove corresponds to a unique standard height, which can accurately lock the target calibration height. This avoids the positioning errors caused by replacing traditional calibration blocks or manual adjustment, ensuring the accuracy of the extension and retraction of the dial indicator body's measuring end, thereby improving the accuracy of the calibration results. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2This is a schematic diagram showing the state when the lowest point of the calibration piece of this utility model is in contact with the dial indicator body; Figure 3 This is a schematic diagram showing the state when the highest point of the calibration piece of this utility model is in contact with the dial indicator body; Figure 4 This is a schematic diagram of the structure of the calibration component of this utility model; Figure 5 This utility model Figure 4 Enlarged structural diagram at point A; Figure 6 This is a first-view structural diagram of the calibration component and adjustment mechanism of this utility model after disassembly. Figure 7 This is a second-view structural diagram of the calibration component and adjustment mechanism of this utility model after they have been separated.

[0015] In the diagram: 1. Base; 101. Mounting base; 2. Dial indicator body; 3. Connecting mechanism; 4. Calibration component; 401. Scale groove; 402. Insertion hole; 403. Screw; 404. Countersunk hole; 405. Through hole; 5. Adjustment mechanism; 501. Splined shaft; 5011. Threaded hole; 502. Worm gear; 503. Worm; 5031. Knob; 6. Indicating assembly; 601. Sleeve; 602. Pointer; 603. Spring. Detailed Implementation

[0016] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] Additional aspects and advantages of this invention will be further set forth in the description which follows in conjunction with the accompanying drawings, and in part will be obvious from the description or may be learned by practice of the invention.

[0018] like Figures 1 to 7As shown, a dial indicator calibration device includes a base 1 and a dial indicator body 2. A connecting mechanism 3 for mounting the dial indicator body 2 and adjusting its height is installed on one side of the top of the base 1. A calibration component 4 is provided below the dial indicator body 2 on the base 1, which contacts its measuring end. The calibration component 4 has a circular cross-section and a sloping top. An adjustment mechanism 5 for controlling the rotation and self-locking of the calibration component 4 is provided below the base 1. Multiple scale grooves 401 are opened on the outer surface of the calibration component 4. An indicator component 6 is provided on the base 1 to cooperate with the scale grooves 401 to accurately adjust the rotation angle of the calibration component 4.

[0019] In summary, the top slope of the calibration piece 4 covers a height range of 0~50mm and higher. By rotating, the height difference of the slope can be used to continuously extend and retract the measuring end of the dial indicator body 2. Unlike traditional devices, there is no need to frequently replace fixed calibration blocks of different heights. This greatly simplifies the repetitive process of changing the calibration medium → repositioning → calibrating the zero point, saves operation time, and improves calibration efficiency.

[0020] The adjustment mechanism 5 includes a splined shaft 501 rotatably mounted on the top of the base 1 (the base 1 has a rotating hole at the bottom of the splined shaft 501, and the splined shaft 501 is connected to the rotating hole through a bearing, thereby reducing the friction force when the splined shaft 501 rotates and improving the stability of the splined shaft 501 during rotation). A worm gear 502 is splinedly connected to the outer surface of the splined shaft 501, and a worm 503 is meshed on the outer surface of the worm gear 502. The worm 503 is rotatably mounted on the top of the base 1, and mounting seats 101 are fixedly installed on both ends of the base 1 corresponding to the worm 503. The worm 503 rotatably engages with the mounting seats 101. A knob 5031 is fixedly installed at one end of the worm 503, and the knob 5031 is located on the outside of the base 1. The mounting seats 101 ensure the stability of the worm 503 during rotation.

[0021] In summary, firstly, the high transmission ratio of the worm gear 502 and worm 503 enables micro-quantitative control of the rotation angle of the calibration piece 4 (each degree of rotation corresponds to a fixed height difference). Combined with the visual positioning of the scale groove 401 and the indicating component 6, each scale groove 401 corresponds to a unique standard height, allowing for precise locking of the target calibration height. This avoids positioning errors caused by traditional calibration block replacements or manual adjustments, ensuring the accuracy of the extension / retraction of the dial indicator body 2's measuring end, thereby improving the precision of the calibration results. Secondly, utilizing the self-locking characteristics of the worm gear 502 and worm 503 (the worm 503 can drive the worm gear 502 to rotate, but the worm gear 502 cannot drive the worm 503 in the opposite direction), the calibration piece 4 can be immediately locked after rotating to the target angle. Self-locking prevents displacement or shaking of the calibration piece 4 due to external force or vibration during the calibration process or data reading, ensuring stable contact between the measuring end of the dial indicator body 2 and the inclined surface of the calibration piece 4, avoiding reading deviations caused by contact point offset, and ensuring the reliability of calibration data; thirdly, the worm gear 502 and worm 503 transmission mechanism has the characteristics of smooth transmission and low wear. Combined with the mechanical positioning design of the scale groove 401, it has stronger anti-interference ability (such as not being affected by power fluctuations and electromagnetic interference) and longer service life compared with electronic adjustment mechanism; the calibration piece 4 adopts a circular structure, the machining accuracy of the inclined surface is easy to control, and the force is uniform during rotation, further improving the durability and long-term stability of the device.

[0022] The calibration piece 4 has a insertion hole 402 at the center of its bottom. The calibration piece 4 is splined to the spline shaft 501 through the insertion hole 402. A screw 403 is rotatably installed at the center of the calibration piece 4. The screw 403 passes through the calibration piece 4 and is threaded to the spline shaft 501. The calibration piece 4 has a countersunk hole 404 at the position corresponding to the head of the screw 403. The calibration piece 4 has a through hole 405 at the threaded part of the screw 403. The through hole 405, countersunk hole 404 and insertion hole 402 are connected. The spline shaft 501 has a threaded hole 5011 at the center of its top that matches the screw 403. By setting the screw 403, a calibration piece 4 with a higher range can be replaced during use. At the same time, after installation, the screw 403 can make the insertion hole 402 fit tightly with the spline shaft 501, thereby ensuring the calibration accuracy of the calibration piece 4.

[0023] The indicating component 6 includes a sleeve 601 fixedly mounted on the top of the base 1. A pointer 602 is slidably mounted inside the sleeve 601. A spring 603 is provided between the bottom end of the pointer 602 and the bottom surface inside the sleeve 601. The top of the pointer 602 is symmetrically provided with two chamfers. The chamfers of the pointer 602 cooperate with the scale groove 401. When the calibration piece 4 rotates, the scale groove 401 will contact the inclined surface of the pointer 602, thereby causing the pointer 602 to compress the spring 603 and slide downward. Then, when the pointer 602 corresponds to another scale groove 401, the elastic force of the spring 603 is restored, thereby causing the pointer 602 to enter another scale groove 401. Thus, by utilizing the cooperation between the scale groove 401 and the indicating component 6, the operator can intuitively read the standard height corresponding to the rotation angle of the calibration piece 4 without relying on complex auxiliary measuring tools or calculations, and quickly locate the target calibration height.

[0024] The usage process is as follows: S1: During the calibration, the dial indicator body 2 is installed on the connecting mechanism 3, and then the height of the dial indicator body 2 is adjusted by the connecting mechanism 3 so that the measuring end of the dial indicator body 2 contacts the lowest point of the inclined surface of the calibration piece 4, and then the dial indicator body 2 is zeroed. S2: After the dial indicator body 2 is installed, the worm 503 is rotated by the knob 5031, so that the worm 503 controls the worm wheel 502 to rotate. Then, the worm wheel 502 is splinedly connected to the spline shaft 501 and the calibration piece 4 is splinedly connected to the spline shaft 501 through the insertion hole 402, so that the worm wheel 502 can control the rotation of the calibration piece 4 through the spline shaft 501. S3: The top slope of the calibration piece covers a height range of 0~50mm and higher. By rotating, the height difference of the slope can be used to achieve continuous extension and retraction of the measuring end of the dial indicator body 2. Unlike traditional devices, there is no need to frequently replace fixed calibration blocks of different heights, which greatly simplifies the operation process, saves operation time, and improves calibration efficiency. S4: The high transmission ratio characteristics of the worm gear 502 and worm 503 enable micro-control of the rotation angle of the calibration piece 4 (each degree of rotation corresponds to a fixed height difference). Combined with the visual positioning of the scale groove 401 and the indicator component 6, each scale groove 401 corresponds to a unique standard height, which can accurately lock the target calibration height, avoid the positioning error caused by the replacement of traditional calibration blocks or manual adjustment, ensure the accuracy of the extension and retraction of the dial indicator body 2, and thus improve the accuracy of the calibration results.

[0025] The dial gauge body 2 and the connecting mechanism 3 described in this application are both well-known technologies in this field, and therefore their specific structures and working principles are not described in detail.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A dial indicator calibration device, characterized in that: Includes a base (1) and a dial gauge body (2). A connecting mechanism (3) for mounting the dial gauge body (2) and adjusting its height is installed on one side of the top of the base (1). The base (1) is located below the dial gauge body (2) and has a calibration piece (4) in contact with its measuring end. The cross-section of the calibration piece (4) is circular and the top of the calibration piece (4) is inclined. The base (1) is located below the calibration piece (4) and is provided with an adjustment mechanism (5) for controlling its rotation and self-locking. The outer surface of the calibration piece (4) is provided with multiple scale grooves (401). The base (1) is provided with an indicator component (6) that cooperates with the scale grooves (401) to accurately adjust the rotation angle of the calibration piece (4).

2. The dial indicator calibration device according to claim 1, characterized in that: The adjustment mechanism (5) includes a spline shaft (501) rotatably disposed on the top of the base (1), a worm gear (502) is splinedly connected to the outer surface of the spline shaft (501), a worm (503) is meshed on the outer surface of the worm gear (502), and the worm (503) is rotatably disposed on the top of the base (1).

3. The dial indicator calibration device according to claim 2, characterized in that: The calibration piece (4) has a insertion hole (402) in the middle of its bottom. The calibration piece (4) is splined to the spline shaft (501) through the insertion hole (402). A screw (403) is rotatably provided at the center of the calibration piece (4). The screw (403) passes through the calibration piece (4) and is threaded to the spline shaft (501).

4. The dial indicator calibration device according to claim 1, characterized in that: The indicator component (6) includes a sleeve (601) fixedly disposed on the top of the base (1), a pointer (602) is slidably disposed inside the sleeve (601), and a spring (603) is disposed between the bottom end of the pointer (602) and the bottom surface inside the sleeve (601).

5. A dial indicator calibration device according to claim 4, characterized in that: The pointer (602) has two chamfers symmetrically arranged at the top, and the chamfers of the pointer (602) cooperate with the scale groove (401).

6. A dial indicator calibration device according to claim 3, characterized in that: The base (1) is fixedly equipped with mounting seats (101) at both ends of the worm (503). The worm (503) is rotatably engaged with the mounting seats (101). A knob (5031) is fixedly provided at one end of the worm (503), and the knob (5031) is located on the outside of the base (1).

7. A dial indicator calibration device according to claim 3, characterized in that: The calibration piece (4) has a countersunk hole (404) at the head of the screw (403), and a through hole (405) at the threaded part of the screw (403). The through hole (405) and the countersunk hole (404) are connected to the insertion hole (402). A threaded hole (5011) that matches the screw (403) is provided at the center of the top of the spline shaft (501).

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