阅读说明：本技术 数显千分尺 (Digital display micrometer ) 是由 李乐航 李里 李宏明 于 2021-03-27 设计创作，主要内容包括：本申请公开了一种数显千分尺,包括操纵轮组件和测杆,在操纵轮组件和测杆之间设有转直机构,用于将操纵轮组件的旋转运动转为直线运动；转直机构包括丝杆、第一支撑、第二支撑和转直件,丝杆和测杆轴线平行,并且它们的轴线距离大于3mm。(The application discloses a digital display micrometer, which comprises a control wheel assembly and a measuring rod, wherein a rotating and straightening mechanism is arranged between the control wheel assembly and the measuring rod and is used for converting the rotating motion of the control wheel assembly into linear motion; the straightening mechanism comprises a screw rod, a first support, a second support and a straightening piece, the axes of the screw rod and the measuring rod are parallel, and the distance between the axes of the screw rod and the measuring rod is more than 3 mm.)

1. A digital display micrometer comprises a micrometer frame, a measuring rod, a control wheel assembly, a control circuit and a linear displacement sensor, and is characterized in that a straightening mechanism is arranged between the measuring rod and the control wheel assembly and used for converting the rotary motion of the control wheel assembly into linear motion and driving the measuring rod to reciprocate along the axis of the measuring rod, and the straightening mechanism comprises a rod body

The screw rod is used for transmitting the rotary motion of the operating wheel assembly and comprises a first optical axis and an operating wheel connecting end connected with the operating wheel assembly;

the first support is used for supporting the screw rod to rotate, one end of the first support is rotatably connected with the first optical axis, and the other end of the first support is fixedly connected with the ruler frame;

the straight piece is used for converting the rotary motion of the screw rod into linear motion and driving the measuring rod to reciprocate along the axis of the measuring rod, one end of the straight piece is in threaded connection with the screw rod, and the other end of the straight piece is connected with the measuring rod;

the axis of the screw rod is parallel to the axis of the measuring rod, and the distance between the axes of the screw rod and the axis of the measuring rod is more than 3 mm.

2. The micrometer according to claim 1, wherein a force sensor is provided between the straightening member and the measuring bar for generating an electronic signal when a reaction force of the measuring bar against a measured object is equal to or greater than a predetermined force, and one end of the force sensor is connected to the straightening member and the other end thereof is connected to the measuring bar and electrically connected to the control circuit.

3. The digital micrometer according to claim 2, wherein the load cell comprises a spring, a reed pipe and a magnet, one end of the spring is connected with the straightening member, the other end of the spring is connected with the measuring rod, one of the reed pipe and the magnet is connected with the measuring rod, and the other is connected with the straightening member.

4. The digital display micrometer according to claim 2, wherein the connecting part of the straightening part and the measuring bar is a sliding connection along the axis direction of the measuring bar, at least one protrusion or groove or plane is arranged at the sliding connection part of the measuring bar, and a corresponding groove or protrusion or plane is arranged at the sliding connection part of the straightening part to prevent the measuring bar from rotating.

5. The digital display micrometer according to claim 3, wherein the connecting part of the straightening part and the measuring bar is a sliding connection along the axis direction of the measuring bar, at least one protrusion or groove or plane is arranged at the sliding connection part of the measuring bar, and a corresponding groove or protrusion or plane is arranged at the sliding connection part of the straightening part to prevent the measuring bar from rotating.

6. The digital micrometer according to claim 1, wherein the straightening member is fixedly connected to the measuring rod.

7. The digital micrometer according to claim 1, wherein the lead screw further comprises

A second optical axis between the first optical axis and the steering wheel attachment end;

the rotating and straightening mechanism also comprises

And the second support is used for supporting the screw rod to do rotary motion, one end of the second support is rotatably connected with the second optical axis, and the other end of the second support is fixedly connected with the ruler frame.

8. The digital micrometer according to claim 1, wherein the steering wheel assembly comprises a ratchet assembly for protecting the straightening mechanism from damage due to excessive force measurement.

9. The digital micrometer according to any one of claims 1 to 8, wherein the linear displacement sensor is one of a linear array image displacement sensor, a grating displacement sensor, a magnetic grating displacement sensor and a capacitive grating displacement sensor, and is used for measuring the relative displacement of the scale frame and the measuring rod.

Technical Field

The application belongs to the length measurement field, relates to a digital display micrometer with turn straight mechanism.

Background

The existing digital display micrometer is divided into an angular displacement digital display micrometer and a linear displacement digital display micrometer according to a displacement sensor, the angular displacement digital display micrometer has a lead screw clearance error, and the measuring range of the angular displacement digital display micrometer is generally not more than 25mm within the range of guaranteeing the precision of a lead screw, so that the adaptability is not strong; the linear displacement digital display micrometer has no screw rod error, greatly reduces the precision of the screw rod and is beneficial to increasing the measuring range. Due to operation habits and stability reasons, the linear displacement digital display micrometer control assembly adopts a wheel type rotating mechanism, the linear displacement digital display micrometer comprises a measuring rod, a straightening part, a fixed sleeve and a screw rod, the screw rod is in threaded connection with the inside of the fixed sleeve and is rotationally connected with one end of the straightening part, a straight groove is formed in the inside of the fixed sleeve, a protrusion is arranged on the straightening part and is in sliding connection with the straight groove, the other end of the straightening part is connected with the measuring rod, the control assembly drives the screw rod to rotate, and the measuring rod is driven by the straightening part to linearly move along the axis of the measuring rod; on the other hand, this design is not conducive to increasing the range.

Disclosure of Invention

In order to solve the problems, the screw rod and the measuring rod are changed into a parallel structure from the existing serial structure, so that the axial size is shortened, the single-hand operation is facilitated, and the measuring range is increased.

A digital display micrometer comprises a micrometer frame, a measuring rod, a control wheel assembly, a control circuit and a linear displacement sensor, wherein a rotating and straightening mechanism is arranged between the measuring rod and the control wheel assembly and used for converting the rotating motion of the control wheel assembly into linear motion and driving the measuring rod to do linear reciprocating motion along the axis of the measuring rod, and the rotating and straightening mechanism comprises a linear displacement sensor and a linear displacement sensor

The screw rod is used for transmitting the rotary motion of the operating wheel assembly and comprises a first optical axis and an operating wheel connecting end connected with the operating wheel assembly;

the first support is used for supporting the screw rod to rotate, one end of the first support is rotatably connected with the first optical axis, and the other end of the first support is fixedly connected with the ruler frame;

the straight piece is used for converting the rotary motion of the screw rod into linear motion and driving the measuring rod to reciprocate along the axis of the measuring rod, one end of the straight piece is in threaded connection with the screw rod, and the other end of the straight piece is connected with the measuring rod;

the axis of the screw rod is parallel to the axis of the measuring rod, and the distance between the axes of the screw rod and the axis of the measuring rod is more than 3 mm.

As a further improvement of the scheme, a force sensor is arranged between the straightening piece and the measuring rod, and is used for generating an electronic signal when the reaction force of the measuring rod against a measured object is greater than or equal to a preset force, one end of the force sensor is connected with the straightening piece, and the other end of the force sensor is connected with the measuring rod and is electrically connected with the control circuit.

As a further improvement of the scheme, the force measuring sensor comprises a spring, a reed pipe and a magnet, one end of the spring is connected with the straightening piece, the other end of the spring is connected with the measuring rod, one of the reed pipe and the magnet is connected with the measuring rod, and the other is connected with the straightening piece.

As a further improvement of the scheme, the connection between the straightening part and the measuring rod is a sliding connection along the axis direction of the measuring rod, at least one protrusion or groove or plane is arranged at the joint of the measuring rod, and a groove or protrusion or plane is correspondingly arranged at the joint of the straightening part to prevent the measuring rod from rotating.

As a further improvement of the scheme, the straightening part is fixedly connected with the measuring rod.

As a further improvement of the scheme, the lead screw further comprises a second optical axis, and the second optical axis is located between the first optical axis and the connecting end of the operating wheel; the straight rotating mechanism further comprises a second support, the second support is used for supporting the screw rod to rotate, one end of the second support is rotatably connected with the second optical axis, and the other end of the second support is fixedly connected with the ruler frame.

As a further improvement of the scheme, the operating wheel assembly comprises a ratchet wheel assembly for protecting the rotating and straightening mechanism from being damaged due to overlarge force measurement.

As a further improvement of the scheme, the linear displacement sensor is one of a linear array image displacement sensor, a grating displacement sensor, a magnetic grating displacement sensor and a capacitive grating displacement sensor, and is used for measuring the relative displacement between the ruler frame and the measuring rod.

Advantageous effects

According to the straightening mechanism, the screw rod and the measuring rod are designed in a parallel structure, three benefits are brought, and firstly, the measuring error caused by the gap of the screw rod is avoided; secondly, the measuring range is increased from 25mm to 50mm, the axial size of the micrometer is hardly increased, and the single-hand operation is convenient; thirdly, the screw pitch of the screw rod can be increased to more than 1mm, and the measuring efficiency can be improved.

Drawings

The drawings in the specification of the present application are only for schematically showing, not for designing, and not for limiting the scope of the claims of the present application;

FIG. 1 is a schematic diagram of a structure of a straightening mechanism;

FIG. 2 is a schematic diagram of a digital micrometer.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

A digital display micrometer is shown in figure 2 and comprises a micrometer frame 1, a measuring rod 2, a control wheel assembly 3, a control circuit 4 and a linear displacement sensor 5.

A rotating and straightening mechanism 6 is arranged between the measuring rod 2 and the operating wheel assembly 3, as shown in fig. 1, the rotating and straightening mechanism 6 is used for converting the rotating motion of the operating wheel assembly 3 into a linear motion and driving the measuring rod 2 to do linear reciprocating motion along the axis of the measuring rod.

The straightening mechanism 6 comprises a screw rod 61, a first support 62 and a straightening piece 63, the screw rod 61 is used for transmitting the rotary motion of the steering wheel assembly 3, and the screw rod 61 comprises a first optical axis 611 and a steering wheel connecting end 612 connected with the steering wheel assembly 3; the first support 62 is used for supporting the screw rod 61 to make a rotary motion, one end of the first support 62 is rotatably connected with the first optical axis 611, and the other end of the first support 62 is fixedly connected with the ruler frame 1; the straight rotating part 63 is used for converting the rotary motion of the screw rod 61 into linear motion and driving the measuring rod 2 to do linear reciprocating motion along the axis of the measuring rod, one end of the straight rotating part is in threaded connection with the screw rod 61, and the other end of the straight rotating part is connected with the measuring rod 2.

In order to shorten the size of the digital micrometer, the screw rod 61 and the measuring rod 2 are arranged in a parallel structure, the axis of the screw rod 61 is parallel to the axis of the measuring rod 2, and the distance between the axes is more than 3 mm.

In order to improve the measurement accuracy and save electricity, a force sensor 7 is arranged between the straightening part 63 and the measuring rod 2, as shown in fig. 2, the force sensor 7 is used for generating an electronic signal when the reaction force of the measuring rod 2, which is abutted against a measured object, is greater than or equal to a predetermined force, one end of the force sensor is connected with the straightening part 63, and the other end of the force sensor is connected with the measuring rod 2 and is electrically connected with the control circuit 4.

The load cell 7 comprises a spring 71, a reed pipe 72 and a magnet 73, one end of the spring 71 is connected with the straightening part 63, the other end of the spring 71 is connected with the measuring rod 2, one of the reed pipe 72 and the magnet 73 is connected with the measuring rod 2, and the other is connected with the straightening part 63; when the measuring rod 2 is abutted to a measured object, the straightening part 63 compresses or stretches the spring 71, so that the distance between the reed pipe 72 and the magnet 73 is changed, and when the measured force reaches the preset measured force, the reed pipe 72 is closed or opened, so that an electronic signal is sent to the control circuit 4.

In order to ensure that the spring 71 can be compressed or stretched by the straightening part 63, one end of the spring 71 and one end of the straightening part 63 are sleeved on the measuring rod 2, one end of the spring 71 is fixedly connected with the measuring rod 2, the other end of the spring 71 is fixedly connected with the straightening part 63, the straightening part 63 is connected with the measuring rod 2 in a sliding manner, and the sliding direction is the same as the axial direction of the measuring rod.

In order to prevent the measuring rod 2 from rotating and bring errors to the measurement of the linear displacement sensor 5, at least one protrusion or groove or plane is arranged at the sliding connection part of the measuring rod 2, and correspondingly, a groove or protrusion or plane is arranged at the sliding connection part of one end of the straight part 63, so that the straight part 63 is in sliding connection with the measuring rod 2 and the measuring rod 2 is prevented from rotating.

If the load cell 7 is not additionally installed, the connection between the straightening part 63 and the measuring rod 2 is a fixed connection, so that the measuring rod 2 can be prevented from rotating.

In order to ensure the installation accuracy and durability of the lead screw 61, the lead screw 61 is further provided with a second optical axis 613, and the second optical axis 613 is located between the first optical axis 611 and the steering wheel connecting end 612; the straightening mechanism 6 is further provided with a second support 64 for supporting the screw rod 61 to rotate, one end of the second support 64 is rotatably connected with the second optical axis 613, and the other end of the second support 64 is fixedly connected with the ruler frame 2.

The steering wheel assembly 3 comprises a ratchet assembly for protecting the straightening mechanism 6 from being damaged due to excessive force measurement.

The linear displacement sensor 5 is one of a linear array image displacement sensor, a grating displacement sensor, a magnetic grating displacement sensor and a capacitive grating displacement sensor, and is used for measuring the relative displacement between the ruler frame 1 and the measuring rod 2.

The above embodiments are only specific examples of the present application, and modifications obvious to those skilled in the art should be made within the scope of the claims of the present application.