CN216283216U

CN216283216U - Hand-held measuring instrument for internal spiral raceway

Info

Publication number: CN216283216U
Application number: CN202122799788.5U
Authority: CN
Inventors: 徐鹏飞; 郑富元; 张�浩; 孟祥焱; 丁榆城
Original assignee: Jinma Industrial Group Co ltd
Current assignee: Jinma Industrial Group Co ltd
Priority date: 2021-11-16
Filing date: 2021-11-16
Publication date: 2022-04-12
Anticipated expiration: 2031-11-16

Abstract

The utility model discloses a handheld measuring instrument for an inner spiral raceway, which belongs to the technical field of measuring devices and is characterized in that: comprises a main shell, a measuring mechanism and a positioning mechanism; a measuring mechanism is arranged in the guide groove of the main shell, and a positioning mechanism is arranged on the measuring mechanism; the measuring mechanism comprises a sliding block, a measuring arm and a dial indicator, and the sliding block is in sliding fit with the main shell; the upper end of the main shell is provided with a dial indicator, and a measuring rod of the dial indicator penetrates through a through hole in the main shell and abuts against the upper end of the sliding block; the positioning mechanism comprises a retainer and balls, the retainers are respectively installed on the outer surfaces of the measuring arms, the placing cavities on the two retainers are distributed along a spiral line, openings communicated with the placing cavities are formed in the outer surfaces of the retainers, the balls are installed in the placing cavities of the retainers, the balls are exposed from the openings of the placing cavities, and the opening areas of the placing cavities are smaller than the diameters of the balls. Compared with the prior art have the characteristics of realizing quick location, reducing measuring error.

Description

Hand-held measuring instrument for internal spiral raceway

Technical Field

The utility model relates to the technical field of measuring devices, in particular to a handheld measuring instrument for an inner spiral raceway.

Background

The steering engine is an important part on the automobile and plays an important role in the automobile handling performance and safe driving. The rack piston is one of key parts of the steering engine, and the nut and the rack are integrated to play a role of a hydraulic piston in a steering engine shell. The coaxiality of the outer circle of the rack piston and the inner thread raceway must be within 0.025mm, otherwise, the hydraulic steering gear cannot work normally, and the driving safety is further influenced. Therefore, in the current detection process of the inner spiral raceway, it is an important task to improve the detection quality and the detection efficiency of the inner spiral raceway.

The existing measuring device for the spiral raceway is difficult to accurately center and position with the circle center of the inner spiral raceway, so that a measuring result has larger error.

Disclosure of Invention

The utility model aims to provide a handheld measuring instrument for an internal spiral raceway, aiming at overcoming the defects in the prior art and achieving the purposes of realizing quick positioning and reducing measurement errors.

The utility model provides a hand-held measuring instrument for an internal spiral raceway, which is characterized in that: comprises a main shell, a measuring mechanism and a positioning mechanism; the main shell is provided with a guide groove with an opening at one end, a measuring mechanism is arranged in the guide groove of the main shell, and a positioning mechanism is arranged on the measuring mechanism; the measuring mechanism comprises a sliding block, a measuring arm and a dial indicator, and the sliding block is in sliding fit with the guide groove of the main shell; the upper end of the main shell is provided with a dial indicator, and a measuring rod of the dial indicator penetrates through a through hole in the main shell and abuts against the upper end of the sliding block; the positioning mechanism comprises a retainer and balls, the retainer is respectively installed on the outer surface of the measuring arm, the two retainers are oppositely arranged, a placing cavity is formed in each retainer, the placing cavities in the two retainers are distributed along a spiral line, an opening communicated with the placing cavity is formed in the outer surface of each retainer, the balls are installed in the placing cavities of the retainers, the balls are exposed out of the opening of the placing cavity, and the opening area of the placing cavity is smaller than the diameter of the balls.

The guide groove of the main shell is internally provided with a guide rod, the sliding block is provided with a guide through hole corresponding to the guide rod, and the guide rod is matched with the guide through hole of the sliding block.

The lower end of the sliding block is connected with the lower end wall of the guide groove of the main shell through a compression spring.

The back plate of the guide groove of the main shell is provided with a strip-shaped through hole, the upper grab handle penetrates through the strip-shaped through hole on the back plate of the main shell to be connected with the sliding block, the lower half part of the main shell is connected with the lower grab handle, and the lower grab handle is positioned below the upper grab handle.

The holder is detachably connected with the measuring arm.

The measuring arm comprises an upper measuring arm and a lower measuring arm, one end of the upper measuring arm is connected with the sliding block, and one end of the lower measuring arm is connected with the main shell.

The retainer mounted on the upper measuring arm is an upper retainer, the retainer mounted on the lower measuring arm is a lower retainer, one ball is mounted on the upper retainer, four balls are mounted on the lower retainer, five balls form a section of spiral line, and four balls mounted on the lower retainer are distributed on two sections of spiral lines in pairs and are separated by a lead distance.

Compared with the prior art, the utility model has the following outstanding beneficial effects:

1. the utility model has a positioning mechanism which is a ball spirally distributed, and when the pitch diameter of the inner spiral raceway is measured, the ball can quickly jack the tooth wall of the inner spiral raceway to realize quick positioning;

2. the retainer is detachably connected with the upper measuring arm and the lower measuring arm respectively, and when the internal spiral raceways with different leads are measured, only the corresponding retainer needs to be replaced, so that the effect of one machine with multiple purposes is realized, and the adaptability is improved.

Drawings

FIG. 1 is a schematic structural view of example 1.

Fig. 2 is a schematic view of the internal structure of embodiment 1.

FIG. 3 is a schematic structural view of embodiment 2.

FIG. 4 is a top view of embodiment 2.

FIG. 5 is a view showing the internal structure of embodiment 2.

Fig. 6 is a partially enlarged view of a portion a in fig. 5.

FIG. 7 is a schematic view of the structure of the lower measuring arm part in example 3.

Detailed Description

The utility model is further described with reference to the drawings and the detailed description.

As shown in fig. 1 and 2, embodiment 1 includes a main casing 1, a measuring mechanism 2, and a positioning mechanism 3.

The main casing body 1 on be equipped with one end open-ended guide way, install measuring mechanism 2 in the guide way of main casing body 1, install positioning mechanism 3 on the measuring mechanism 2.

Measuring mechanism 2 include slider 22, measuring arm 23 and percentage table 21, slider 22 and main casing 1's guide way sliding fit, its specific cooperation mode is: a plurality of guide rods 24 are arranged in the guide grooves of the main shell 1, guide through holes corresponding to the guide rods 24 are arranged on the sliding blocks 22, and the guide rods 24 are matched with the guide through holes of the sliding blocks 22.

The lower end of the slide block 22 is connected with the lower end wall of the guide groove of the main casing 1 through a compression spring, the measuring arm 23 comprises an upper measuring arm 231 and a lower measuring arm 232, one end of the upper measuring arm 231 is fixedly connected with the slide block 22, one end of the lower measuring arm 232 is fixedly connected with the main casing 1, and the lower measuring arm 232 is positioned under the upper measuring arm 231.

The upper end wall of the guide groove of the main shell 1 is provided with a through hole, the dial indicator 21 is arranged at the upper end of the main shell 1, and the measuring rod of the dial indicator passes through the through hole on the main shell 1 and is propped against the upper end of the sliding block 22.

The backplate of main casing body 1's guide way on be equipped with rectangular shape through-hole, upper grab handle 25 passes rectangular shape through-hole on the main casing body 1 backplate and is connected with slider 22, the lower half of main casing body 1 is connected with lower grab handle 26, lower grab handle 26 is located the below of upper grab handle 25, upper grab handle 25 and lower grab handle 26 are convenient for hold the operation this device.

Positioning mechanism 3 include holder 32 and ball 31, on measure and install holder 32 respectively on the surface of arm 231 and lower measurement arm 232, two holder 32 mutual disposition, be equipped with on the holder 32 and place the chamber, the chamber of placing on two holders 32 distributes along the helix, be equipped with on the surface of holder 32 and place the opening that the chamber link up mutually, ball 31 is installed to the intracavity of placing of holder 32, ball 31 exposes by the opening part of placing the chamber, thereby can push up on the tooth wall of interior spiral raceway, the open area of placing the chamber is less than ball 31's diameter, thereby can avoid ball 31 to expose from the opening part of placing the chamber.

The balls 31 on the holders 32 of the upper and lower measuring

arms

231 and 232 are located on the same spiral line.

In this embodiment, the holder 32 is detachably connected to the upper measuring arm 231 and the lower measuring arm 232, and the detachable connection manner is as follows: the holder 32 is connected to the upper and lower measuring

arms

231 and 232 by pins or bolts, respectively.

In the optimized scheme, the retainer 32 is provided with a plurality of sections of bosses which are distributed spirally, and the bosses are provided with placing cavities.

In this embodiment, the holder 32 mounted on the upper measuring arm 231 is an upper holder 321, the holder 32 mounted on the lower measuring arm 232 is a lower holder 322, one ball 31 is mounted on the upper holder 321, four balls 31 are mounted on the lower holder 322, five balls 31 form a section of spiral line, and four balls 31 mounted on the lower holder 322 are distributed on two sections of spiral lines in pairs and have a distance of a lead. When the inner spiral raceway is measured, the five balls 31 are pressed against the tooth wall of the inner spiral raceway, and the thread pitch and the thread lead angle of the spiral line formed by the five balls 31 are communicated with the inner spiral raceway. Therefore, the axes of the spiral lines where the five balls 31 are located are coincident with the axis of the inner spiral raceway, and the positioning can be performed quickly.

The operation flow is as follows: when the utility model is used for measuring the internal spiral raceway, the retainer 32 which can enable the spiral line formed by the balls 31 on the retainer 32 to have the same pitch as the internal spiral raceway is selected, the slider 22 is pressed downwards through the upper grab handle 25, the compression spring is compressed, the upper measuring arm 231 and the lower measuring arm 232 are butted, the upper measuring arm 231 and the lower measuring arm 232 are placed into the internal spiral raceway, the upper grab handle 25 is loosened, the balls 31 on the upper measuring arm 231 and the lower measuring arm 232 are pressed against the tooth wall of the internal spiral raceway, and the size of the middle diameter of the internal spiral raceway is displayed through the dial indicator 21.

In embodiment 1, when the internal helical raceways with different pitches need to be measured, the corresponding retainer 32 with the pitch placing cavity needs to be replaced, which not only is complicated to operate, but also needs a series of matched retainers 32, and is higher in cost. In embodiment 2, the distance between the balls 31 mounted on the upper measuring arm 231 and the lower measuring arm 232 can be adjusted, so that the requirements of the inner spiral raceways with different pitches can be met.

As shown in fig. 4 to 6, in embodiment 2, the measuring arm 23 is provided with an inner placing groove, the holder 32 is provided with a corresponding outer placing groove, the outer surface of the holder 32 is provided with a strip-shaped opening communicated with the outer placing groove, the width of the strip-shaped through hole of the holder 32 is smaller than the diameter of the ball 31, the bottom of the inner placing groove of the measuring arm 23 is provided with a sliding groove, a screw 33 is installed in the sliding groove, one end of the screw 33 is rotatably matched with the wall at one end of the sliding groove, and the other end of the screw passes through the other end wall of the sliding groove and is connected with the countersunk head. The spout in install guide block 35, the both ends and the spout wall laminating of guide block 35, be equipped with the screw through-hole on the guide block 35, the screw through-hole of guide block 35 cooperatees with lead screw 33, guide block 35 and ball frame 34 fixed connection, install ball 31 on the ball frame 34, ball 31 installs in the cavity that the guide way formed in outer guide way of holder 32 and the measuring arm 23 to expose by the rectangular shape opening of holder 32.

By adjusting the rotary screw 33, the distance between the different balls 31 can be adjusted, thereby satisfying the inner helical raceways of different pitches.

In this embodiment, the upper measuring arm 231 is provided with an inner placing groove, and a ball 31 is installed in the inner placing groove of the upper measuring arm 231. The lower measuring arm 232 is provided with two inner placing grooves, the three inner placing grooves are distributed in a circumferential shape, two balls 31 are arranged in each guide groove of the lower measuring arm 232, a screw 33 in the slide groove of the lower measuring arm 232 is a bidirectional screw, and two sections of threads of the bidirectional screw are respectively matched with a threaded through hole of one guide block 35.

In embodiment 2, the distance between the balls 31 can be adjusted to meet the requirements of the inner spiral raceways with different pitches, but the requirements of the inner spiral raceways with different lead angles cannot be met. In embodiment 3, the requirements of the inner spiral raceways with different pitches and different lead angles can be met at the same time.

As shown in fig. 7, in embodiment 3, two inner placing grooves are formed in the lower measuring arm 232, two balls 31 are installed in each placing groove of the lower measuring arm 232, two lead screws 33 and two guide blocks 35 are installed in each sliding groove of the lower measuring arm 232, a threaded through hole and a guide through hole are respectively formed in each guide block 35, threaded holes of the two guide blocks 35 are respectively in threaded fit with different lead screws 33, the other lead screw 33 penetrates through the guide through hole of each guide block 35, and each guide block 35 is respectively connected to one ball frame 34. By adjusting each ball 31 individually, it is possible to make five balls 31 form a helix of different pitch and lead angle.

It should be noted that while the utility model has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various obvious changes can be made therein without departing from the spirit and scope of the utility model.

Claims

1. A hand-held measuring instrument for an internal spiral raceway is characterized in that: comprises a main shell (1), a measuring mechanism (2) and a positioning mechanism (3); a guide groove with an opening at one end is arranged on the main shell (1), a measuring mechanism (2) is arranged in the guide groove of the main shell (1), and a positioning mechanism (3) is arranged on the measuring mechanism (2); the measuring mechanism (2) comprises a sliding block (22), a measuring arm (23) and a dial indicator (21), wherein the sliding block (22) is in sliding fit with a guide groove of the main shell (1); the upper end of the main shell (1) is provided with a dial indicator (21), and a measuring rod of the dial indicator (21) penetrates through a through hole in the main shell (1) and is propped against the upper end of the sliding block (22); positioning mechanism (3) including holder (32) and ball (31), install holder (32) on the surface of measuring arm (23) respectively, two holder (32) mutual disposition, be equipped with on holder (32) and place the chamber, the chamber of placing on two holder (32) distributes along the helix, be equipped with on the surface of holder (32) and place the opening that the chamber link up mutually, ball (31) are installed to the intracavity of placing of holder (32), ball (31) are exposed by the opening part of placing the chamber, the opening area of placing the chamber is less than the diameter of ball (31).

2. The hand-held measuring instrument for the internal spiral raceway of claim 1, wherein: the guide groove of the main shell (1) is internally provided with a guide rod (24), the sliding block (22) is provided with a guide through hole corresponding to the guide rod (24), and the guide rod (24) is matched with the guide through hole of the sliding block (22).

3. The hand-held measuring instrument for the internal spiral raceway of claim 1, wherein: the lower end of the sliding block (22) is connected with the lower end wall of the guide groove of the main shell (1) through a compression spring.

4. The hand-held measuring instrument for the internal spiral raceway of claim 1, wherein: the backplate of the guide way of the main shell body (1) is provided with a strip-shaped through hole, the upper grab handle (25) penetrates through the strip-shaped through hole on the backplate of the main shell body (1) to be connected with the sliding block (22), the lower half part of the main shell body (1) is connected with the lower grab handle (26), and the lower grab handle (26) is positioned below the upper grab handle (25).

5. The hand-held measuring instrument for the internal spiral raceway of claim 1, wherein: the holder (32) is detachably connected with the measuring arm (23).

6. The hand-held measuring instrument for the internal spiral raceway of claim 1, wherein: the measuring arm (23) comprises an upper measuring arm (231) and a lower measuring arm (232), one end of the upper measuring arm (231) is connected with the sliding block (22), and one end of the lower measuring arm (232) is connected with the main shell (1).

7. The hand-held measuring instrument for the internal spiral raceway of claim 6, wherein: the retainer (32) of going up measurement arm (231) installation be last retainer (321), the retainer (32) of lower measurement arm (232) installation be lower retainer (322), install a ball (31) on going up retainer (321), install four ball (31) on lower retainer (322), five ball (31) constitute one section helix on, four ball (31) two double distributions on two sections screw threads of lower retainer (322) installation, and apart from the distance of a lead.