Universal comparison measuring instrument

Abstract

The utility model discloses a universal comparison measuring instrument which comprises a measuring rod and a digital display meter, the measuring rod is a hollow shell, and the surface of the shell of the measuring rod comprises a switching hole; the measuring device comprises a spline shaft, an outer diameter limiting block and a locking piece, the spline shaft, the outer diameter limiting block and the locking piece are installed in the measuring rod and are coaxially arranged, an inner diameter spring and an outer diameter spring which are arranged outside the spline shaft in a sleeving mode are installed on the locking piece, and an inner diameter limiting block arranged on the spline shaft in a sleeving mode is further installed at the other end of the inner diameter spring; an adjusting screw capable of fixing the locking piece on the spline shaft is arranged on the locking piece, and the adjusting screw can extend into the switching hole; the movable measuring claw is fixed with the spline shaft, the fixed measuring claw can move along the length direction of the measuring rod, and the tightness of the fixed measuring claw on the measuring rod is controlled through an inner hexagonal screw; the measuring head is detachably installed on the movable measuring claw and the fixed measuring claw. According to the utility model, the measurement of various sizes such as the inner diameter and the outer diameter can be realized, and the application range can be widened through the measuring head.

Description

TECHNICAL FIELD

[0001] The utility model relates to measuring instrument technical field, concretely relates to a universal comparison measuring instrument. BACKGROUND

[0002] A comparison measuring instrument is a type of precision instrument used to measure the differences in size, shape, or other parameters between two or more objects. These instruments are widely used in industrial manufacturing, quality control, laboratory research, and precision engineering fields. A comparison measuring instrument does not directly display the absolute value of the measured object, but rather measures the difference between a known standard (reference) and the measured object.

[0003] However, the current conventional inner diameter or outer diameter measuring gauges have the problems of single application scene and inability to measure multiple types of sizes. For example, a caliper is convenient to use for measurement and detection, but has low precision and a single application scene; a micrometer or an inner diameter gauge has high precision, but has a single application scene and narrow measurement purpose; and various customized gauges and tooling can only be adapted to corresponding measured sizes, have high prices, and have poor versatility. SUMMARY

[0004] In order to overcome the above shortcomings, the utility model aims at providing a universal comparison measuring instrument which can measure multiple sizes such as inner diameter and outer diameter and can expand the application range through a measuring head.

[0005] TECHNICAL SOLUTION: The utility model discloses a universal comparison measuring instrument, taking the comparison measuring instrument as a reference, having a first end direction and a second end direction, and comprising:

[0006] A measuring rod and a digital display gauge installed at one end of the measuring rod, the measuring rod is a hollow shell, and the surface of the shell of the measuring rod comprises a switching hole;

[0007] A measuring device, the measuring device comprises a spline shaft installed in the measuring rod and coaxially arranged with the measuring rod, an outer diameter limiting block fixed in the interior of the measuring rod, and a locking member sleeved on the spline shaft, the spline shaft can move axially in the measuring rod, the digital display gauge is in abutment with the first end of the spline shaft, the locking member is located at the second end of the spline shaft, the locking member is provided with an inner diameter spring and an outer diameter spring sleeved outside the spline shaft, the inner diameter spring and the outer diameter spring are towards the first end, the length of the inner diameter spring is not greater than the length of the outer diameter spring, an inner diameter limiting block fixed on the spline shaft is further installed at the other end of the inner diameter spring, the locking member is provided with an adjusting screw capable of fixing the locking member on the spline shaft, and the adjusting screw can extend into the switching hole;

[0008] A movable measuring claw is fixed with the spline shaft, a limiting hole for the movement of the movable measuring claw is arranged on the shell of the measuring rod, and the movable measuring claw moves along the length direction of the measuring rod;

[0009] A fixed measuring claw is movable along the length direction of the measuring rod and is controlled by an internal hex screw to be loose or tight on the measuring rod;

[0010] A measuring head is detachably installed on the movable measuring claw and the fixed measuring claw.

[0011] Further, the locking member comprises a large boss and a small boss, the outer diameter spring is installed on the large boss, and the inner diameter spring is installed on the small boss.

[0012] Further, the diameter of the inner diameter limiting block is smaller than the diameter of the outer diameter spring.

[0013] Further, the back surface of the movable measuring claw and the fixed measuring claw is provided with a plurality of alignment supporting points.

[0014] Further, the spline shaft further comprises two fixed splines, and the fixed splines are located on both sides of the movable measuring claw.

[0015] Further, the outer diameter limiting block is sleeved on the outside of the fixed spline away from the first end.

[0016] Further, the measuring head at least comprises a disc type measuring head, a conical type measuring head and a shoulder type measuring head.

[0017] The utility model discloses the beneficial effects are:

[0018] (1) by switching hole and the adjusting screw on the locking member, the user can conveniently fix or adjust the position of the locking member, thereby switching the measurement state of the inner diameter or the outer diameter, and through the cooperation of the movable measuring claw and the fixed measuring claw, the comparative measurement of various sizes is realized.

[0019] (2) the measuring head is detachable, and at least comprises a disc type measuring head, a conical type measuring head and a shoulder type measuring head, can be suitable for the measurement of workpieces of different shapes and sizes, and the application range of the measuring instrument is improved.

[0020] (3) the alignment supporting points on the back surface of the movable measuring claw and the fixed measuring claw help to make the measurement more accurate and stable when positioning and clamping the workpiece. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes and proportions of the components in the drawings are only illustrative and are used to help understand the present disclosure, and are not specifically limited to the shapes and proportions of the components of the present disclosure. Those skilled in the art can select various possible shapes and proportions to implement the present disclosure according to specific circumstances under the guidance of the present disclosure. In the drawings:

[0022] Figure 1 A structure diagram of the universal comparative measuring instrument according to the present disclosure;

[0023] Figure 2 A schematic diagram of the universal comparative measuring instrument cooperating with the measuring head according to the present disclosure.

[0024] In the drawings: 1, first end; 2, second end; 3, measuring rod; 31, switching hole; 32, limiting hole; 4, digital display meter; 51, spline shaft; 52, locking piece; 521, adjusting screw; 522, large boss; 523, small boss; 53, inner diameter spring; 531, inner diameter limiting block; 54, outer diameter spring; 541, outer diameter limiting block; 61, movable measuring claw; 62, fixed measuring claw; 621, inner hexagonal screw; 7, alignment support point; 8, fixed spline; 9, measuring head. DETAILED DESCRIPTION

[0025] The present disclosure will be further illustrated below in combination with the drawings and specific embodiments.

[0026] In the description of the present disclosure, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and therefore cannot be understood as limiting the devices or elements indicated or implied to have a specific orientation, structure and operation. Therefore, it cannot be understood as a limitation on the present disclosure. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances. The embodiments will be described below according to the overall structure of the present disclosure.

[0027] As shown in Figure 1 and Figure 2 The present disclosure provides a universal comparative measuring instrument. The comparative measuring instrument is used as a reference, has a first end 1 direction and a second end 2 direction, and the universal comparative measuring instrument comprises:

[0028] A measuring rod 3 and a digital display meter 4 installed at one end of the measuring rod 3, the measuring rod 3 is a hollow shell, the shell surface of the measuring rod 3 comprises a switching hole 31;

[0029] A measuring device, the measuring device comprises a spline shaft 51 installed in the measuring rod 3 and coaxially arranged with the measuring rod 3, an outer diameter limiting block 541 fixed in the inside of the measuring rod 3 and a locking piece 52 sleeved on the spline shaft 51, the spline shaft 51 can move axially in the measuring rod 3, the digital display meter 4 abuts against the first end 1 of the spline shaft 51, the locking piece 52 is located at the second end 2 of the spline shaft 51, the locking piece 52 is provided with an inner diameter spring 53 and an outer diameter spring 54 sleeved on the outside of the spline shaft 51, the inner diameter spring 53 and the outer diameter spring 54 are towards the first end 1, the other end of the inner diameter spring 53 is further provided with an inner diameter limiting block 531 sleeved on the spline shaft 51, the locking piece 52 is provided with an adjusting screw 521 capable of fixing the locking piece 52 on the spline shaft 51, the adjusting screw 521 can be inserted into the switching hole 31;

[0030] A movable measuring claw 61, the movable measuring claw 61 is fixed with the spline shaft 51, the shell of the measuring rod 3 is provided with a limiting hole 32 for the movement of the movable measuring claw 61, the movable measuring claw 61 moves along the length direction of the measuring rod 3;

[0031] A fixed measuring claw 62, the fixed measuring claw 62 can move along the length direction of the measuring rod 3 and control the tightness of the fixed measuring claw 62 on the measuring rod 3 through an inner hexagonal screw 621;

[0032] A measuring head 9, the measuring head 9 is detachably installed on the movable measuring claw 61 and the fixed measuring claw 62.

[0033] Through the above structure, the universal comparative measuring instrument can measure the inner diameter or the outer diameter, the switching of the inner diameter measurement mode and the outer diameter measurement mode is mainly through the cooperation of the adjusting screw 521 on the locking piece 52 and the switching hole 31 on the measuring rod 3. When measuring the standard workpiece, the value is set through the digital display meter 4, then the workpiece to be measured is measured, and the actual measured value of the digital display meter 4 is obtained through the distance changed by the spline shaft 51.

[0034] Preferably, the structure of the locking piece 52 can comprise a large boss 522 and a small boss 523, the diameter of the inner diameter spring 53 is smaller than the diameter of the outer diameter spring 54, therefore, one end of the outer diameter spring 54 is connected to the large boss 522, and one end of the inner diameter spring 53 is connected to the small boss 523.

[0035] In the measurement of the outer diameter, the comparative measuring instrument is in a stationary state, the locking member 52 is fixed at the second end 2 of the spline shaft 51, the movable measuring jaw 61 is located at the end part of the movable range towards the second end 2, at this time the outer diameter spring 54 connected with the locking member 52 is in abutment with the outer diameter limiting block 541 fixed in the measuring rod 3. The movable measuring jaw 61 is fixedly connected with the spline shaft 51, when the movable measuring jaw 61 moves towards the first end 1, the spline shaft 51 as a whole also moves towards the first end 1. Due to the blockage of the outer diameter limiting block 541, the locking member 52 and the outer diameter limiting block 541 jointly cause the extrusion of the outer diameter spring 54, when the movable measuring jaw 61 is released, the force of the extrusion of the outer diameter spring 54 disappears, the outer diameter spring 54 restores the deformation, thus the locking member 52 moves towards the second end 2, therefore the spline shaft 51 as a whole and the movable measuring jaw 61 move towards the second end 2. In the measurement, after the position of the fixed measuring jaw 62 is determined by the inner hexagonal screw 621, the movable measuring jaw 61 is pulled towards the first end 1, when the movable measuring jaw 61 is released, the movable measuring jaw 61 moves towards the second end 2 under the action of the outer diameter spring 54, the movable measuring jaw 61 and the fixed measuring jaw 62 form a state of clamping in the middle, thus the measurement of the outer diameter of the workpiece is completed.

[0036] In the measurement of the inner diameter, the movable measuring jaw 61 originally located at the second end 2 of the limiting hole 32 is moved towards the first end 1 until the adjusting screw 521 on the locking member 52 is aligned with the switching hole 31 on the outer shell of the measuring rod 3, the adjusting screw 521 is rotated so that it can extend into the switching hole 31, and under the action of the adjusting screw 521, the switching hole 31 also forms a limit for the locking member 52, while the locking member 52 is loosened on the spline shaft 51, and the spline shaft 51 can move along the length direction of the measuring rod 3. In the static state, the movable measuring jaw 61 is located at the first end 1 of its movable range, i.e. the first end 1 of the limiting hole 32, and since the position of the locking member 52 on the spline shaft 51 has changed, the inner diameter spring 53 located between the inner diameter limiting block 531 and the locking member 52 at this time can be in a static state or a compressed state. Because the locking member 52 is loose with the spline shaft 51 at this time, even if the outer diameter spring 54 is in a compressed state, it will not affect the spline shaft 51. When the movable measuring jaw 61 moves towards the second end 2, the locking member 52 is limited by the switching hole 31 and cannot move, the inner diameter limiting block 531 is fixed on the spline shaft 51, the spline shaft 51 as a whole moves towards the second end 2, and the inner diameter limiting block 531 and the locking member 52 jointly act on the inner diameter spring 53 to cause extrusion, when the movable measuring jaw 61 is released, the position of the locking member 52 is fixed, so that the inner diameter spring 53 recovers the deformation to drive the spline shaft 51 to move towards the first end 1. During measurement, after the position of the fixed measuring jaw 62 is determined by the inner hexagonal screw 621, the movable measuring jaw 61 is pulled towards the second end 2, and when the movable measuring jaw 61 is released, it moves towards the first end 1 under the action of the inner diameter spring 53, the movable measuring jaw 61 and the fixed measuring jaw 62 form a state of being stretched to both sides, and the measurement of the inner diameter of the workpiece is completed.

[0037] Preferably, two fixed splines 8 are further provided on the spline shaft 51, the fixed splines 8 are installed inside the measuring rod 3 and located on both sides of the movable measuring jaw 61, and the spline shaft 51 can move along the length direction of the measuring rod 3 through the fixed splines 8. The fixed splines 8 can limit the movable range of the movable measuring jaw 61 and also guide the movement of the spline shaft 51. In order to prevent the fixed splines 8 from being unstable, an outer diameter limiting block 541 is further sleeved and fixed on the outside of the fixed splines 8 away from the first end 1 to fill the internal space of the measuring rod 3.

[0038] In the embodiment, the back of the movable measuring claw 61 and the fixed measuring claw 62 is provided with an alignment support point 7, which can ensure that the movable measuring claw 61 and the fixed measuring claw 62 always maintain good alignment and consistency during use. If the movable measuring claw 61 and the fixed measuring claw 62 are misaligned, it may cause errors in the measurement data or even fail to complete the measurement. By setting several alignment support points 7, the stability during measurement can be effectively improved, and measurement deviation caused by improper operation or surface characteristics of the measurement object can be avoided.

[0039] In the embodiment, the measuring head 9 can be replaced according to actual needs, and the measuring head 9 at least includes a disc type measuring head, a conical type measuring head, and a shoulder type measuring head. The disc type measuring head is suitable for plane measurement and can provide a larger contact area, effectively reducing the error caused by point contact, especially when measuring large planes or irregular surfaces, it has higher stability and accuracy. The conical type measuring head is suitable for measuring small holes, grooves or other narrow parts that are difficult to reach, and can enter areas that cannot be covered by traditional plane measuring heads, providing more comprehensive measurement capabilities. The special geometry of the shoulder type measuring head makes it suitable for measuring workpieces with steps, edges or shoulder features, and can accurately capture the size parameters of these complex geometric shapes. The universal comparison measuring instrument described in the utility model significantly enhances the multifunctionality of the measuring head 9 by combining multiple measuring head forms, and can meet diverse measurement needs. Whether in precise measurement of complex workpieces or in irregularly shaped special measurement environments, this design can effectively adapt. At the same time, the user can quickly replace the measuring head according to specific measurement needs, greatly improving work efficiency and the flexibility of the measuring tool.

[0040] So far, the technical scheme of the utility model has been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without deviating from the principles of the utility model, those skilled in the art can make equivalent changes or replacements to related technical features, and the technical scheme after these changes or replacements will fall within the protection scope of the utility model.

Claims

1. A universal comparison measuring instrument, characterized in that, With the comparison measuring instrument as a benchmark, having a first end direction and a second end direction, comprising: a measuring rod and a digital display gauge installed at one end of the measuring rod, the measuring rod being a hollow shell, the shell surface of the measuring rod comprising a switching hole; a measuring device, the measuring device comprising a spline shaft installed in the measuring rod and coaxially arranged with the measuring rod, an outer diameter limiting block fixed in the interior of the measuring rod, and a locking member sleeved on the spline shaft, the spline shaft being capable of moving axially in the measuring rod, the digital display gauge abutting against the first end of the spline shaft, the locking member being located at the second end of the spline shaft, the locking member having an inner diameter spring and an outer diameter spring sleeved outside the spline shaft installed thereon, the inner diameter spring and the outer diameter spring being towards the first end, the length of the inner diameter spring being not greater than the length of the outer diameter spring, the other end of the inner diameter spring further having an inner diameter limiting block fixed on the spline shaft, the locking member being provided with an adjusting screw capable of fixing it on the spline shaft, the adjusting screw being capable of extending into the switching hole; a movable measuring claw, the movable measuring claw being fixed with the spline shaft, the shell of the measuring rod being provided with a limiting hole for the movement of the movable measuring claw, the movable measuring claw moving along the length direction of the measuring rod; a fixed measuring claw, the fixed measuring claw being capable of moving along the length direction of the measuring rod and being controlled by an inner hexagonal screw for its tightness on the measuring rod; a measuring head, the measuring head being detachably installed on the movable measuring claw and the fixed measuring claw.

2. The universal comparative measuring instrument according to claim 1, characterized in that, The locking member comprises a large boss and a small boss, the outer diameter spring being installed on the large boss, and the inner diameter spring being installed on the small boss.

3. The universal comparative measuring instrument according to claim 2, characterized in that, The diameter of the inner diameter limiting block is smaller than the diameter of the outer diameter spring.

4. The universal comparative measuring instrument according to claim 1, characterized in that, The back surface of the movable measuring claw and the fixed measuring claw is provided with a plurality of alignment support points.

5. The universal comparative measuring instrument according to claim 1, characterized in that, The spline shaft further comprises two fixed splines, the fixed splines being located on both sides of the movable measuring claw.

6. The universal comparative measuring instrument according to claim 5, characterized in that, The outer diameter limiting block is sleeved outside the fixed spline away from the first end.

7. The universal comparative measuring instrument of claim 1, wherein, The measuring head at least comprises a disc type measuring head, a conical type measuring head, and a shoulder type measuring head.

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