Device for measuring inner diameter of steering rack lead screw nut

Abstract

The utility model relates to the technical field of machinery, in particular to a device for measuring the inner diameter of a steering rack lead screw nut, which comprises a bottom plate, a bracket, a horizontal sliding table, a horizontal sliding table cylinder, a workpiece base, a clamping jaw cylinder, a clamping jaw, a vertical sliding table, a vertical sliding table cylinder, a measuring head assembly, a driving device, a cam and a connecting rod, the measuring head assembly comprises a connecting seat, a first measuring arm, a second measuring arm, a measuring steel ball, a displacement sensor and a spring. Compared with the prior art, fixation and horizontal movement of the nut are realized through the clamping jaw cylinder and the horizontal sliding table, vertical lifting of the measuring head assembly is realized through the vertical sliding table, small-range movement of the horizontal sliding table in the measuring process is realized through the cam and the connecting rod, and measurement of inner diameter data of the nut is realized through the measuring head assembly. And the measurement precision and the automation degree are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of machinery, in particular to a device for measuring the inner diameter of a steering rack lead screw nut. Background Art

[0002] In the steering system, the nut is a core component, and the internal grinding process of the nut is a core process. After internal grinding, the inner diameter of the nut, that is, the cross-ball diameter, needs to be measured, and the measurement results are fed back to the machine tool, and the machine tool compensates the inner diameter based on the measurement results.

[0003] At present, the inner diameter of nuts is mostly measured by manual measuring tools or pneumatic measuring tools, which have the disadvantages of low measurement accuracy and inability to measure automatically.

[0004] Therefore, it is necessary to design a device for measuring the inner diameter of the steering rack lead screw nut to improve the measurement accuracy and automation. Summary of the invention

[0005] The utility model aims to overcome the deficiencies of the prior art and provides a device for measuring the inner diameter of a steering rack lead screw nut to improve the measurement accuracy and the degree of automation.

[0006] In order to achieve the above-mentioned purpose, the utility model is a device for measuring the inner diameter of a steering rack lead screw nut, comprising a base plate, a bracket, a horizontal slide, a horizontal slide cylinder, a workpiece base, a clamping cylinder, a clamping claw, a vertical slide, a vertical slide cylinder, a measuring head assembly, a driving device, a cam, and a connecting rod. The top of the base plate is provided with a bracket and a horizontal slide, the piston rod of the horizontal slide cylinder is connected to the horizontal movable plate of the horizontal slide, the horizontal movable plate of the horizontal slide is installed with the workpiece base and the clamping claw cylinder, the piston of the clamping claw cylinder is connected to the clamping claw, the clamping claw clamps or releases the nut located on the workpiece base, the middle part of the bracket is installed with a driving device and a connecting rod, the cam sleeve is arranged outside the shaft of the driving device, and the outer surface of the cam is connected to one end of the connecting rod The bracket is in contact with the horizontal slide, and the other end of the connecting rod is in contact with or separated from the horizontal slide. A vertical slide is installed on the front side of the bracket. The piston rod of the vertical slide cylinder is connected to the vertical movable plate of the vertical slide. A measuring head assembly is installed on the vertical movable plate of the vertical slide. The measuring head assembly includes a connecting seat, a measuring arm 1, a measuring arm 2, a measuring steel ball, a displacement sensor, and a spring. A rotatable measuring arm 1 and a measuring arm 2 are installed in the middle of the connecting seat. The lower parts of the measuring arm 1 and the measuring arm 2 are connected to the connecting seat by springs respectively. A measuring steel ball is installed on the outer side of the measuring arm 1 and the measuring arm 2 respectively. The lower end of the measuring arm 2 is covered at the notch at the lower end of the measuring arm 1. The displacement sensor is arranged between the lower end of the measuring arm 2 and the lower end of the measuring arm 1.

[0007] A limiting device is provided at the rear extreme position of the horizontal slide.

[0008] The limiting device includes a limiting rod and an adjusting nut. The limiting rod is installed on the base plate, and the adjusting nut is installed on the horizontal slide. The positions of the limiting rod and the adjusting nut correspond. The end of the limiting rod close to the horizontal slide contacts or separates from the adjusting nut.

[0009] The horizontal slide comprises a horizontal guide rail and a horizontal movable plate. The horizontal guide rail is installed on the top of the base plate. One end of the horizontal guide rail is located at the front side of the base plate. The other end of the horizontal guide rail extends to the bottom of the measuring head assembly. The horizontal movable plate is slidably connected to the horizontal guide rail.

[0010] The vertical slide comprises a vertical guide rail and a vertical movable plate. The vertical guide rail is installed on the front side of the bracket, and the vertical movable plate is slidably connected to the vertical guide rail.

[0011] The signal output end of the displacement sensor is connected to the data interface of the host computer.

[0012] The measuring arm 1 and the measuring arm 2 extend into the nut, and the measuring steel ball contacts the inner screw track of the nut.

[0013] Compared with the prior art, the utility model realizes the fixation and horizontal movement of the nut through the clamping claw cylinder and the horizontal slide, realizes the vertical lifting of the measuring head assembly through the vertical slide, realizes the small-range movement of the horizontal slide during the measurement process through the cam and the connecting rod, and realizes the measurement of the inner diameter data of the nut through the measuring head assembly, thereby improving the measurement accuracy and the degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 It is a cross-sectional view of the utility model.

[0016] Figure 3 This is a front view of the measuring head assembly of the utility model.

[0017] Figure 4 It is a top view of the measuring head assembly of the utility model.

[0018] Figure 5 It is a side view of the measuring head assembly of the utility model. DETAILED DESCRIPTION

[0019] The utility model is now further described with reference to the accompanying drawings.

[0020] See also Figure 1 , Figure 2The utility model is a device for measuring the inner diameter of a steering rack lead screw nut, comprising a base plate, a bracket, a horizontal slide, a horizontal slide cylinder, a workpiece base, a clamping claw cylinder, a clamping claw, a vertical slide, a vertical slide cylinder, a measuring head assembly, a driving device, a cam, and a connecting rod. A bracket 19 and a horizontal slide 1 are provided on the top of a base plate 18. A piston rod of a horizontal slide cylinder 10 is connected to a horizontal movable plate of the horizontal slide 1. A workpiece base 4, a clamping claw cylinder 3, and a clamping claw cylinder are installed on the horizontal movable plate of the horizontal slide 1. The piston of the cylinder 3 is connected to the clamp 2, and the clamp 2 clamps or releases the nut 17 located on the workpiece base 4. The middle part of the bracket 19 is installed with a driving device and a connecting rod 8. The cam 9 is sleeved outside the shaft of the driving device. The outer surface of the cam 9 contacts with one end of the connecting rod 8, and the other end of the connecting rod 8 contacts or separates from the horizontal slide 1. The front side of the bracket 19 is installed with a vertical slide 6. The piston rod of the vertical slide cylinder 7 is connected with the vertical movable plate of the vertical slide 6, and the measuring head assembly 5 is installed on the vertical movable plate of the vertical slide 6.

[0021] See also Figure 3 , Figure 4 and Figure 5 The measuring head assembly 5 includes a connecting seat 20, a measuring arm 13, a measuring arm 21, a measuring steel ball 14, a displacement sensor 15, and a spring 16. The middle part of the connecting seat 20 is equipped with a rotatable measuring arm 13 and a measuring arm 21. The lower parts of the measuring arms 13 and 21 are connected to the connecting seat 20 by springs 16 respectively. A measuring steel ball 14 is installed on the outer side of the measuring arm 13 and the measuring arm 21 respectively. The lower end of the measuring arm 21 is covered at the lower end notch of the measuring arm 13. The displacement sensor 15 is arranged between the lower end of the measuring arm 21 and the lower end of the measuring arm 13.

[0022] A limit device is provided at the rear extreme position of the horizontal slide 1. The limit device includes a limit rod 12 and an adjusting nut 11. The limit rod 12 is mounted on the bottom plate 18, and the adjusting nut 11 is mounted on the horizontal slide 1. The position of the limit rod 12 corresponds to that of the adjusting nut 11, and one end of the limit rod 12 close to the horizontal slide 1 is in contact with or separated from the adjusting nut 11. The function of the limit device is to limit the extreme position of the horizontal slide 1, and the extreme position can be adjusted by the adjusting nut 11.

[0023] The horizontal slide 1 includes a horizontal guide rail and a horizontal movable plate. The horizontal guide rail is installed on the top of the base plate 18. One end of the horizontal guide rail is located at the front side of the base plate 18, and the other end of the horizontal guide rail extends to the bottom of the measuring head assembly 5. The horizontal movable plate is slidably connected to the horizontal guide rail.

[0024] The vertical slide 6 includes a vertical guide rail and a vertical movable plate. The vertical guide rail is installed on the front side of the bracket 19, and the vertical movable plate is slidably connected to the vertical guide rail.

[0025] The signal output end of the displacement sensor 15 is connected to the data interface of the host computer. The displacement sensor 15 transmits the measured displacement data to the software unit of the host computer through the data interface.

[0026] When the utility model is working, the nut 17 is placed on the workpiece base 4, the clamping cylinder 3 drives the clamping claw 2 to clamp the nut 17, the horizontal slide cylinder 10 drives the horizontal slide 1 to move to the horizontal measurement position below the measuring head assembly 5, and the adjustment nut 11 contacts the limit rod 12 to reach the limit position. The measuring head assembly 5 is driven to the vertical measurement position by the vertical slide cylinder 7, and the measuring arm 1 13 and the measuring arm 2 21 extend into the nut 17. Due to the tensile force of the two springs 16, the measuring arm 1 13 and the measuring arm 2 21 are in a pulled apart state, and the two measuring steel balls 14 contact the inner screw of the nut 17, and the displacement sensor 15 is compressed by the measuring arm 1 13 and the measuring arm 2 21 to generate displacement data.

[0027] Next, the driving device drives the cam 9 to rotate, and drives the horizontal slide 1 to move within a small range of about 1 mm through the connecting rod 8. During the movement of the horizontal slide 1, the two measuring steel balls 14 slide in the inner screw of the nut 17, and the displacement sensor 15 continuously generates displacement data. All displacement data are transmitted to the software unit of the host computer through the data interface. The software unit selects the maximum displacement data from all displacement data. The maximum displacement data is the inner diameter of the nut, also known as the cross-ball diameter. In actual use, the software unit can display the inner diameter of the nut on the display screen, or return it to the machine tool so that the machine tool can compensate for the inner diameter of the nut.

[0028] The utility model realizes the fixation and horizontal movement of the nut by means of a clamping claw cylinder and a horizontal slide, realizes the vertical lifting of a measuring head assembly by means of a vertical slide, realizes the small-range movement of the horizontal slide during the measurement process by means of a cam and a connecting rod, and realizes the measurement of the inner diameter data of the nut by means of the measuring head assembly, thereby improving the measurement accuracy and the degree of automation.

Claims

1. A device for measuring the inner diameter of a steering rack screw nut, comprising a base plate, a bracket, a horizontal slide, a horizontal slide cylinder, a workpiece base, a clamping cylinder, a clamping claw, a vertical slide, a vertical slide cylinder, a measuring head assembly, a driving device, a cam, and a connecting rod, characterized in that: A bracket (19) and a horizontal slide (1) are provided on the top of the bottom plate (18); a piston rod of a horizontal slide cylinder (10) is connected to a horizontal movable plate of the horizontal slide (1); a workpiece base (4) and a clamping cylinder (3) are installed on the horizontal movable plate of the horizontal slide (1); a piston of the clamping cylinder (3) is connected to a clamping claw (2); the clamping claw (2) clamps or releases a nut (17) located on the workpiece base (4); a driving device and a connecting rod (8) are installed in the middle of the bracket (19); a cam (9) is sleeved outside the shaft of the driving device; an outer surface of the cam (9) contacts one end of the connecting rod (8); and the other end of the connecting rod (8) contacts or separates from the horizontal slide (1); a vertical slide (6) is installed on the front side of the bracket (19); a piston rod of the vertical slide cylinder (7) is connected to a vertical movable plate of the vertical slide (6) A measuring head assembly (5) is mounted on the vertical movable plate of the vertical slide (6). The measuring head assembly (5) comprises a connecting seat (20), a measuring arm 1 (13), a measuring arm 2 (21), a measuring steel ball (14), a displacement sensor (15), and a spring (16). A rotatable measuring arm 1 (13) and a measuring arm 2 (21) are mounted in the middle of the connecting seat (20). The lower parts of the measuring arm 1 (13) and the measuring arm 2 (21) are connected to the connecting seat (20) by springs (16) respectively. A measuring steel ball (14) is mounted on the outer side of the measuring arm 1 (13) and the measuring arm 2 (21). The lower end of the measuring arm 2 (21) is covered at the lower end notch of the measuring arm 1 (13). The displacement sensor (15) is arranged between the lower end of the measuring arm 2 (21) and the lower end of the measuring arm 1 (13).

2. A device for measuring the inner diameter of a steering rack lead screw nut according to claim 1, characterized in that: A limiting device is provided at the rear extreme position of the horizontal slide (1).

3. A device for measuring the inner diameter of a steering rack lead screw nut according to claim 2, characterized in that: The limiting device comprises a limiting rod (12) and an adjusting nut (11); the limiting rod (12) is mounted on a base plate (18), and the adjusting nut (11) is mounted on a horizontal slide (1); the limiting rod (12) and the adjusting nut (11) are positioned correspondingly; an end of the limiting rod (12) close to the horizontal slide (1) is in contact with or separated from the adjusting nut (11).

4. The device for measuring the inner diameter of a steering rack lead screw nut according to claim 1, characterized in that: The horizontal slide (1) comprises a horizontal guide rail and a horizontal movable plate. The horizontal guide rail is mounted on the top of the base plate (18). One end of the horizontal guide rail is located at the front side of the base plate (18). The other end of the horizontal guide rail extends to the bottom of the measuring head assembly (5). The horizontal movable plate is slidably connected to the horizontal guide rail.

5. The device for measuring the inner diameter of a steering rack lead screw nut according to claim 1, characterized in that: The vertical slide (6) comprises a vertical guide rail and a vertical movable plate. The vertical guide rail is mounted on the front side of the bracket (19), and the vertical movable plate is slidably connected to the vertical guide rail.

6. The device for measuring the inner diameter of a steering rack lead screw nut according to claim 1, characterized in that: The signal output end of the displacement sensor (15) is connected to the data interface of the host computer.

7. The device for measuring the inner diameter of a steering rack lead screw nut according to claim 1, characterized in that: The measuring arm 1 (13) and the measuring arm 2 (21) extend into the nut (17), and the measuring steel ball (14) contacts the inner thread of the nut (17).

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