Thread helical surface roughness measuring device

Abstract

The utility model discloses a device for measuring the roughness of a thread helical surface, belongs to the technical field of roughness measurement, and solves the technical problem that the roughness of the thread helical surface cannot be measured by a contact pin method in the prior art. The device comprises a machine table and a processor, one side of the machine table is provided with a clamping mechanism used for clamping a screw rod to be measured and a transmission mechanism used for driving the clamping mechanism to rotate and move up and down, the other side of the machine table is provided with a stand column, the stand column is provided with a support, one end of the support is provided with a contact pin used for measuring the roughness of the thread helical surface of the screw rod to be measured, and the processor is electrically connected with the transmission mechanism and the contact pin. According to the utility model, the transmission mechanism drives the clamping mechanism to rotate and move up and down, the clamping mechanism drives the measured screw rod to rotate and move up and down, and the contact pin is contacted with the thread helical surface, so that the roughness of the thread helical surface can be effectively and conveniently measured.

Description

Technical Field

[0001] This utility model relates to the field of roughness measurement technology, and more specifically, it relates to a device for measuring the roughness of a threaded helical surface. Background Technology

[0002] Surface roughness is an important precision indicator for mechanical parts. The surface roughness of components with mating requirements has a significant impact on the service life and reliability of mechanical products. Currently, commonly used methods for measuring surface roughness include: comparison method, optical sectioning method, interferometry method, stylus method, and impression method. Among these, the surface roughness measuring instrument based on the stylus method is the most widely used due to its rapid and convenient measurement, high accuracy, and application.

[0003] There are many surface roughness measuring instruments on the market that use the stylus method, but they can only measure the roughness of relatively flat machined surfaces and cannot measure the roughness of curved surfaces such as threaded helical surfaces. Currently, the roughness of threaded helical surfaces is detected by visual observation or touch to make a qualitative comprehensive evaluation of the roughness of the threaded helical surface, and the surface roughness value cannot be quantitatively detected. Utility Model Content

[0004] The technical problem to be solved by this utility model is to address the above-mentioned shortcomings of the prior art. The purpose of this utility model is to provide a thread helical surface roughness measuring device that can quantitatively detect the surface roughness value of the thread helical surface.

[0005] The technical solution of this utility model is: a thread helical surface roughness measuring device, including a machine base and a processor; one side of the machine base is provided with a clamping mechanism for clamping the screw to be measured and a transmission mechanism for driving the clamping mechanism to rotate and move up and down; the other side of the machine base is provided with a column, the column is provided with a bracket, one end of the bracket is provided with a stylus for measuring the thread helical surface roughness of the screw to be measured; the processor is electrically connected to the transmission mechanism and the stylus.

[0006] As a further improvement, the transmission mechanism includes a transmission body installed on the machine base and a rotary drive unit installed at the bottom of the machine base. The clamping mechanism is inserted into the transmission body and is connected to the transmission body by a thread, a trapezoidal screw, or a ball screw. The rotation axis of the rotary drive unit is slidably inserted into the clamping mechanism, and a radial limiting structure is provided between the rotation axis and the clamping mechanism.

[0007] Furthermore, the transmission body is provided with a mating hole and a guide hole that are interconnected from top to bottom, and the diameter of the mating hole is larger than the diameter of the guide hole; correspondingly, the outer wall of the clamping mechanism is provided with a mating section that mates with the mating hole and a guide section that slides into the guide hole, and the mating hole and the mating section are connected by a thread, a trapezoidal screw, or a ball screw.

[0008] Furthermore, the radial limiting structure includes a flat structure located at one end of the rotating shaft and a flat hole located within the clamping mechanism, wherein the flat structure of the rotating shaft is slidably inserted into the flat hole.

[0009] Furthermore, the radial limiting structure includes a spline located at one end of the rotating shaft and a spline hole located in the clamping mechanism, wherein the spline of the rotating shaft is slidably inserted into the spline hole.

[0010] Furthermore, the machine tool is provided with mounting holes for mounting the transmission body, and the outer wall of the transmission body is provided with a connecting plate, which is locked to the machine tool by bolts.

[0011] Furthermore, the rotary drive unit is any one of an electric motor, a pneumatic motor, or a hydraulic motor.

[0012] Furthermore, the electric motor is a servo motor or a stepper motor.

[0013] Furthermore, the clamping mechanism is provided with a chuck at the top for clamping the screw being tested.

[0014] Furthermore, it also includes a display and a keyboard electrically connected to the processor, the processor being mounted on the column.

[0015] Beneficial effects

[0016] Compared with the prior art, the advantages of this utility model are as follows:

[0017] This invention uses a transmission mechanism to drive a clamping mechanism to rotate and move up and down. The clamping mechanism drives the screw being measured to rotate and move up and down, and the stylus contacts the thread helical surface, thereby effectively and conveniently measuring the roughness of the thread helical surface. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the flat structure in this utility model;

[0020] Figure 3 This is a schematic diagram of the clamping mechanism and transmission body in this utility model.

[0021] The components are: 1-Machine base, 2-Processor, 3-Screw under test, 4-Clamping mechanism, 5-Column, 6-Bracket, 7-Pin, 8-Transmission body, 9-Rotary drive unit, 10-Rotary shaft, 11-Mating hole, 12-Guide hole, 13-Threaded section, 14-Guide section, 15-Flat structure, 16-Connecting plate, 17-Bolt, 18-Chuck, 19-Display, 20-Keyboard. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0023] The stylus-type profilometry method for measuring surface roughness is a relatively mature technology. Its working principle is as follows: A diamond stylus is mounted at one end of the sensor probe. The stylus tip has a sufficiently small radius of curvature. During measurement, the stylus tip is placed on the workpiece surface, and a driver drags the stylus at a certain speed. The undulating peaks and valleys of the measured surface cause the stylus to oscillate up and down during this dragging process. This movement, passing through a fulcrum, causes the magnetic core to move up and down synchronously, thus changing the inductance of the two differential inductor coils surrounding the magnetic core. The sensor coils and measurement circuit are directly connected to a balanced bridge. The change in coil inductance causes the bridge to become unbalanced, resulting in an output signal proportional to the displacement of the stylus. This weak electrical change is amplified by an electronic device and phase-sensitively detected to obtain a signal representing the magnitude and direction of the stylus displacement. One signal is sent to a DC power amplifier, amplified, and then drives a recorder to record data, which is simultaneously displayed on a monitor. The other signal is filtered and amplified by an averaging amplifier, then integrated to calculate the final surface roughness Ra value.

[0024] See Figures 1-3 A thread helical surface roughness measuring device includes a machine base 1 and a processor 2. One side of the machine base 1 is provided with a clamping mechanism 4 for clamping the screw 3 to be measured, and a transmission mechanism for driving the clamping mechanism 4 to rotate and move up and down. The other side of the machine base 1 is provided with a column 5, and the column 5 is provided with a bracket 6. One end of the bracket 6 is provided with a stylus 7 for measuring the thread helical surface roughness of the screw 3 to be measured. The processor 2 is electrically connected to the transmission mechanism and the stylus 7.

[0025] Specifically, the transmission mechanism includes a transmission body 8 installed on the machine base 1 and a rotary drive unit 9 installed at the bottom of the machine base 1. The clamping mechanism 4 is inserted into the transmission body 8 and is connected to the transmission body 8 by a thread, a trapezoidal screw, or a ball screw. Of course, the pitch of the thread connecting the clamping mechanism 4 and the transmission body 8 is equal to the thread pitch of the screw 3 being measured. The rotating shaft 10 of the rotary drive unit 9 slides upward into the clamping mechanism 4, and a radial limiting structure is provided between the rotating shaft 10 and the clamping mechanism 4.

[0026] The rotating shaft 10 drives the clamping mechanism 4 to rotate via a radial limiting structure. Simultaneously, because the clamping mechanism 4 and the transmission body 8 are connected by a threaded connection, a trapezoidal screw connection, or a ball screw connection, the clamping mechanism 4 moves upward or downward while rotating, resulting in vertical sliding between the clamping mechanism 4 and the rotating shaft 10. The clamping mechanism 4 drives the screw 3 being measured to rotate and move up and down. The probe 7 contacts the thread helical surface. While the probe 7 remains stationary, the detection data from the probe 7 is transmitted to the processor 2, thus effectively and conveniently measuring the roughness of the thread helical surface, and simultaneously measuring both internal and external threads.

[0027] Preferably, the clamping mechanism 4 and the transmission body 8 are connected by a torque-free threaded connection, a trapezoidal screw connection, or a ball screw connection.

[0028] Furthermore, the transmission body 8 is provided with a mating hole 11 and a guide hole 12 that are interconnected from top to bottom. The diameter of the mating hole 11 is larger than the diameter of the guide hole 12. Correspondingly, the outer wall of the clamping mechanism 4 is provided with a mating section 13 that is connected to the mating hole 11 and a guide section 14 that is slidably inserted into the guide hole 12. The mating hole 11 and the mating section 13 are connected by a thread, a trapezoidal screw, or a ball screw. The mating of the guide hole 12 and the guide section 14 can improve the accuracy of the up and down movement of the clamping mechanism 4.

[0029] In one embodiment, the radial limiting structure includes a flat structure 15 located at one end of the rotating shaft 10 and a flat hole located in the clamping mechanism 4, wherein the flat structure 15 of the rotating shaft 10 is slidably inserted into the flat hole.

[0030] In one embodiment, the radial limiting structure includes a spline at one end of the rotating shaft 10 and a spline hole in the clamping mechanism 4, wherein the spline of the rotating shaft 10 is slidably inserted into the spline hole.

[0031] The machine base 1 is provided with mounting holes for mounting the transmission body 8. The outer wall of the transmission body 8 is provided with a connecting plate 16. The connecting plate 16 is locked to the machine base 1 by bolts 17, which facilitates disassembly and assembly.

[0032] The rotary drive unit 9 can be any one of an electric motor, a pneumatic motor, or a hydraulic motor. Preferably, the electric motor is a servo motor or a stepper motor, which can accept instructions from the processor 2 and realize stepless speed regulation to adapt to threads of different nominal diameters.

[0033] In this embodiment, the top of the clamping mechanism 4 is provided with a chuck 18 for clamping the screw 3 to be tested. The chuck 18 can be a three-jaw chuck or a four-jaw chuck.

[0034] This device also includes a display 19 and a keyboard 20 electrically connected to the processor 2, which is mounted on the column 5. The measurement results of the processor 2 can be output through the display 19, and the measurement parameters can be set through the keyboard 20.

[0035] The above are merely preferred embodiments of this utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these will not affect the implementation effect of this utility model or the practicality of the patent.

Claims

1. A device for measuring the roughness of a threaded helical surface, comprising a machine base (1), characterized in that, It also includes a processor (2); one side of the machine base (1) is provided with a clamping mechanism (4) for clamping the screw (3) to be tested, and a transmission mechanism for driving the clamping mechanism (4) to rotate and move up and down. The other side of the machine base (1) is provided with a column (5), the column (5) is provided with a bracket (6), one end of the bracket (6) is provided with a stylus (7) for measuring the roughness of the thread helical surface of the screw (3) to be tested, and the processor (2) is electrically connected to the transmission mechanism and the stylus (7).

2. The thread helical surface roughness measuring device according to claim 1, characterized in that, The transmission mechanism includes a transmission body (8) installed on the machine base (1) and a rotary drive unit (9) installed at the bottom of the machine base (1). The clamping mechanism (4) is inserted into the transmission body (8) and is connected to the transmission body (8) by a thread, a trapezoidal screw, or a ball screw. The rotating shaft (10) of the rotary drive unit (9) slides upward into the clamping mechanism (4). A radial limiting structure is provided between the rotating shaft (10) and the clamping mechanism (4).

3. The thread helical surface roughness measuring device according to claim 2, characterized in that, The transmission body (8) is provided with a mating hole (11) and a guide hole (12) that are interconnected from top to bottom. The diameter of the mating hole (11) is larger than the diameter of the guide hole (12). Correspondingly, the outer wall of the clamping mechanism (4) is provided with a mating section (13) that is connected to the mating hole (11) and a guide section (14) that is slidably inserted into the guide hole (12). The mating hole (11) and the mating section (13) are connected by a thread, a trapezoidal screw, or a ball screw.

4. The thread helical surface roughness measuring device according to claim 2, characterized in that, The radial limiting structure includes a flat structure (15) located at one end of the rotating shaft (10) and a flat hole located in the clamping mechanism (4). The flat structure (15) of the rotating shaft (10) is slidably inserted into the flat hole.

5. A thread helical surface roughness measuring device according to claim 2, characterized in that, The radial limiting structure includes a spline at one end of the rotating shaft (10) and a spline hole in the clamping mechanism (4), wherein the spline of the rotating shaft (10) is slidably inserted into the spline hole.

6. A thread helical surface roughness measuring device according to claim 2, characterized in that, The machine base (1) is provided with mounting holes for mounting the transmission body (8), and the outer wall of the transmission body (8) is provided with a connecting plate (16), which is locked to the machine base (1) by bolts (17).

7. A thread helical surface roughness measuring device according to claim 2, characterized in that, The rotary drive unit (9) can be any one of an electric motor, a pneumatic motor, or a hydraulic motor.

8. A thread helical surface roughness measuring device according to claim 7, characterized in that, The electric motor is either a servo motor or a stepper motor.

9. A thread helical surface roughness measuring device according to claim 1, characterized in that, The clamping mechanism (4) is provided with a chuck (18) at the top for clamping the screw (3) being tested.

10. A thread helical surface roughness measuring device according to claim 1, characterized in that, It also includes a display (19) and a keyboard (20) electrically connected to the processor (2), the processor (2) being mounted on the column (5).

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