1. The utility model provides an automatic measuring equipment for detecting work piece hole precision which characterized in that: the device comprises a measuring head (10) of the air gauge, a measuring head moving mechanism (20) and a workpiece clamping mechanism (30); the air gauge measuring head (10) is fixed on the measuring head moving mechanism (20), a workpiece (40) with an inner hole is fixed by the workpiece clamping mechanism (30), and the air gauge measuring head (10) can be inserted into the inner hole of the workpiece (40) along the central axis of the workpiece to be detected under the driving of the measuring head moving mechanism (20).

2. The automatic measuring device for detecting the accuracy of the inner hole of the workpiece according to claim 1, wherein: gauge head moving mechanism (20) includes support (21), sharp module (22), motor (23), pneumatic finger mount pad (24), pneumatic finger (25), gyration cylinder mount pad (26), gyration cylinder (27), rotatory cover of gauge head (28), sharp module (22) are fixed on support (21), and pneumatic finger mount pad (24) and gyration cylinder mount pad (26) are all installed on sharp module (22), pneumatic finger (25) are used for the middle part of centre gripping pneumatic measurement appearance gauge head (10), and in the upper end of pneumatic measurement appearance gauge head (10) was fixed in rotatory cover of gauge head (28), the rotatory cover of gauge head (28) was installed on gyration cylinder (27).

3. The automatic measuring device for detecting the accuracy of the inner hole of the workpiece according to claim 1 or 2, characterized in that: the workpiece clamping mechanism (30) comprises a clamp table (31), an ultrathin cylinder (32) is installed below the table top of the clamp table (31), a positioning pin seat (32 c) is sleeved on a connecting rod (32 a) of the ultrathin cylinder (32), the upper end of the positioning pin seat (32 c) is in a circular table shape, and under the driving of the ultrathin cylinder (32), the upper end of the positioning pin seat (32 c) can protrude upwards through a through hole in the table top of the clamp table (31) and is positioned on the same straight line with a measuring head (10) of the pneumatic measuring instrument; the clamp comprises a clamp table (31), and is characterized in that a corner cylinder (33) is mounted on the table surface of the clamp table (31), a transverse cylinder pressing plate (33 a) is mounted on an ejector rod of the corner cylinder (33), the far end of the cylinder pressing plate (33 a) is an annular part, a concentric annular pressing head (33 b) is mounted on the lower surface of the annular part, under the combined action of the corner cylinder (33) and the cylinder pressing plate (33 a), the annular pressing head (33 b) can align to a positioning pin seat (32 c) when moving downwards and fix a workpiece (40) on the table surface of the clamp table (31), and the annular pressing head (33 b) can deflect to one side by a certain angle relative to the positioning pin seat (32 c) when moving upwards.

4. An automatic measuring device for detecting the accuracy of bores in workpieces according to claim 3, wherein: a spring (32 b) is sleeved on a connecting rod (32 a) of the ultrathin cylinder (32).

5. An automatic measuring device for detecting the accuracy of bores in workpieces according to claim 3, wherein: at least three elastic knock pins (34) are arranged on the table surface of the clamp table (331) at positions surrounding the positioning pin seats (32 c).

6. An automatic measuring device for detecting the accuracy of bores in workpieces according to claim 3, wherein: proximity switches (35) are installed on the ultra-thin cylinder (32) and the corner cylinder (33).

Background

The gear and rotor parts are the most common functional parts in the industries of machinery and automobile parts, the inner holes of the gear and rotor parts are generally required to be finished, the precision grade is required to be above IT7 grade, and the qualification after machining can directly influence the assembly of related parts and the performance of assembly parts.

The prior art has the following inner hole precision detection modes for gear and rotor parts: 1) plug gauge detection judgment, which belongs to manual detection and can not realize data quantification; 2) the detection of the inside micrometer has low detection efficiency, the data needs to be recorded manually, and the error detection and the error judgment are easy; 3) the manual electronic air gauge is an advanced detection mode at present, but is influenced by manual operation, is easy to generate wrong detection and wrong judgment, and is not suitable for advanced and automatic production online detection.

Disclosure of Invention

The invention aims to provide automatic measuring equipment for detecting the accuracy of an inner hole of a workpiece.

In order to solve the technical problems, the invention adopts the technical scheme that: an automatic measuring device for detecting the precision of an inner hole of a workpiece comprises a pneumatic measuring instrument measuring head, a measuring head moving mechanism and a workpiece clamping mechanism; the pneumatic measuring instrument measuring head is fixed on the measuring head moving mechanism, a workpiece with an inner hole is fixed by the workpiece clamping mechanism, and the pneumatic measuring instrument measuring head can be inserted into the inner hole of the workpiece along the central axis of the workpiece to be detected under the driving of the measuring head moving mechanism.

In the technical scheme, the workpiece is fixed by the clamping mechanism, and the measuring head of the pneumatic measuring instrument is driven by the moving mechanism to do linear motion, so that the accuracy of a detection result can be ensured, and the working efficiency can be improved.

In one embodiment, the measuring head moving mechanism comprises a support, a linear module, a motor, a pneumatic finger mounting seat, a pneumatic finger, a rotary cylinder mounting seat, a rotary cylinder and a measuring head rotating sleeve, wherein the linear module is fixed on the support, the pneumatic finger mounting seat and the rotary cylinder mounting seat are both mounted on the linear module, the pneumatic finger is used for clamping the middle part of a measuring head of the pneumatic instrument, the upper end of the measuring head of the pneumatic instrument is fixed in the measuring head rotating sleeve, and the measuring head rotating sleeve is mounted on the rotary cylinder. When the pneumatic measuring instrument works, the motor drives the linear module to do linear motion relative to the support, and the rotary cylinder rotates the measuring head of the pneumatic measuring instrument by a certain angle through the measuring head rotating sleeve.

In one embodiment, the workpiece clamping mechanism comprises a clamp table, an ultrathin air cylinder is mounted below a table top of the clamp table, a positioning pin seat is sleeved on a connecting rod of the ultrathin air cylinder, the upper end of the positioning pin seat is in a round table shape, and the upper end of the positioning pin seat can protrude upwards through a through hole of the table top of the clamp table and is positioned on the same straight line with a measuring head of the pneumatic measuring instrument under the driving of the ultrathin air cylinder; the fixture comprises a fixture table, a positioning pin seat, a positioning pin, a transverse air cylinder pressing plate, a rotary angle air cylinder, a transverse air cylinder pressing plate, an annular pressing head and a rotary angle air cylinder, wherein the rotary angle air cylinder is installed on a table board of the fixture table, the transverse air cylinder pressing plate is installed on an ejector rod of the rotary angle air cylinder, the far end of the air cylinder pressing plate is an annular part, a concentric annular pressing head is installed on the lower surface of the annular part, under the combined action of the rotary angle air cylinder and the air cylinder pressing plate, the annular pressing head can be aligned to the positioning pin seat when moving downwards and can fix a workpiece on the table board of the fixture table, and the annular pressing head can deflect to one side by a certain angle relative to the positioning pin seat when moving upwards. The locating pin seat in the technical scheme can be used for centering the workpiece, so that the central axis of the workpiece and the measuring head of the pneumatic measuring instrument are positioned on the same straight line. When the fixture table works, the ultrathin cylinder pushes the positioning pin base out of the table surface of the fixture table, then the workpiece is sleeved on the positioning pin base, and then the corner cylinder drives the annular pressure head to move downwards to clamp and fix the workpiece on the table surface of the fixture table.

Furthermore, a spring is sleeved on the connecting rod of the ultrathin cylinder.

Furthermore, at least three elastic jacking pins are arranged on the table surface of the clamp table at positions surrounding the positioning pin seat. The elastic ejector pin can eject the workpiece from the table surface of the clamp table.

Preferably, the ultra-thin cylinder and the corner cylinder are both provided with proximity switches.

Drawings

Fig. 1 is a schematic perspective view of an automatic measuring apparatus according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of a probe moving mechanism according to an embodiment of the present invention;

FIG. 3 is a schematic perspective view of a workpiece clamping mechanism according to an embodiment of the present invention;

FIG. 4 is a schematic view, partially in section, of a workpiece holding mechanism according to an embodiment of the invention;

FIG. 5 is a schematic view, partially in section, of another embodiment of a workpiece clamping mechanism;

the reference signs are:

10-pneumatic measuring instrument measuring head 20-measuring head moving mechanism

30-workpiece holding mechanism 40-workpiece

21-support 22-straight line module

23-motor 24-pneumatic finger mounting base

25-pneumatic finger 26-rotary cylinder mounting base

27-rotary cylinder 28-measuring head rotary sleeve

31-clamp table 32-ultrathin cylinder

32 a-link 32 b-spring

32 c-positioning pin seat 33-corner cylinder

33 a-cylinder pressure plate 33 b-annular pressure head

34-elastic knock pin 35-proximity switch.

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or interconnected between two elements, directly or indirectly through intervening media, and the specific meaning of the terms may be understood by those skilled in the art according to their specific situation.

As shown in fig. 1 to 3, an automatic measuring device for detecting the accuracy of an inner hole of a workpiece comprises a pneumatic measuring instrument measuring head 10, a measuring head moving mechanism 20 and a workpiece clamping mechanism 30; the air gauge head 10 is fixed to the head moving mechanism 20, the workpiece 40 having an inner hole is fixed by the workpiece holding mechanism 30, and the air gauge head 10 can be inserted into the inner hole of the workpiece 40 along the central axis of the workpiece to be detected by the driving of the head moving mechanism 20.

Measuring head moving mechanism 20 includes support 21, sharp module 22, motor 23, pneumatic finger mount pad 24, pneumatic finger 25, gyration cylinder mount pad 26, gyration cylinder 27, the rotatory cover of measuring head 28, sharp module 22 is fixed on support 21, pneumatic finger mount pad 24 and gyration cylinder mount pad 26 are all installed on sharp module 22, pneumatic finger 25 is used for the middle part of centre gripping air gauge measuring head 10, the upper end of air gauge measuring head 10 is fixed in the rotatory cover of measuring head 28, the rotatory cover of measuring head 28 is installed on gyration cylinder 27.

The workpiece clamping mechanism 30 comprises a clamp table 31, an ultrathin cylinder 32 is installed below the table surface of the clamp table 31, a spring 32b and a positioning pin seat 32c are sleeved on a connecting rod 32a of the ultrathin cylinder 32, the upper end of the positioning pin seat 32c is in a circular truncated cone shape, and under the driving of the ultrathin cylinder 32, the upper end of the positioning pin seat 32c can protrude upwards through a through hole on the table surface of the clamp table 31 and is positioned on the same straight line with the air gauge measuring head 10; a corner cylinder 33 is arranged on the table surface of the clamp table 31, a transverse cylinder pressing plate 33a is arranged on an ejector rod of the corner cylinder 33, the far end of the cylinder pressing plate 33a is an annular part, a concentric annular pressing head 33b is arranged on the lower surface of the annular part, under the combined action of the corner cylinder 33 and the cylinder pressing plate 33a, the annular pressing head 33b can be aligned to the positioning pin seat 32c when moving downwards and can fix the workpiece 40 on the table surface of the clamp table 31, and the annular pressing head 33b can deflect to one side by a certain angle relative to the positioning pin seat 32c when moving upwards; at least three elastic knock pins 34 are arranged on the table surface of the clamp table 31 at positions surrounding the positioning pin seat 32c, and proximity switches 35 are arranged on the ultra-thin air cylinder 32 and the corner air cylinder 33.

When the fixture works, the starting button is pressed, the ultrathin cylinder 32 pushes the positioning pin seat 32c out of the table surface of the fixture table 31, the workpiece 40 is sleeved on the positioning pin seat 32c by hands or a manipulator, and then the corner cylinder 32 drives the annular pressure head 32b to move downwards to clamp and fix the workpiece 40 on the table surface of the fixture table 31; the motor 23 drives the linear module 22 to move linearly downwards relative to the support 21, drives the measuring head 10 of the air gauge to extend into the shaft hole of the workpiece 40 for measurement, and transmits the detected data to the air gauge for display or transmits the detected data to the control system for judgment and storage; the rotary cylinder 27 rotates the measuring head 10 of the air gauge by a certain angle through the measuring head rotary sleeve 28; after the measurement is completed, the measuring head moving mechanism 20 drives the air gauge measuring head 10 to move upwards, the workpiece clamping mechanism 30 releases the workpiece 40, and at the moment, the elastic ejector pin 34 jacks up the workpiece 40 to separate the workpiece 40 from the table surface of the clamp table 31, so that the workpiece 40 can be more conveniently grabbed and taken away from the clamp table 31 manually or by a mechanical hand.

The above embodiments are preferred implementations of the present invention, and the present invention can be implemented in other ways without departing from the spirit of the present invention.

Some of the drawings and descriptions of the present invention have been simplified to facilitate the understanding of the improvements over the prior art by those skilled in the art, and some other elements have been omitted from this document for the sake of clarity, and it should be appreciated by those skilled in the art that such omitted elements may also constitute the subject matter of the present invention.