CN212599118U

CN212599118U - Self-centering positioning device with adjustable reference circle

Info

Publication number: CN212599118U
Application number: CN202020794987.XU
Authority: CN
Inventors: 文国富; 李金良; 谭建平
Original assignee: Chongqing Jiangbei Machinery Co ltd
Current assignee: Chongqing Jiangbei Machinery Co ltd
Priority date: 2020-05-14
Filing date: 2020-05-14
Publication date: 2021-02-26
Anticipated expiration: 2030-05-14

Abstract

The utility model discloses a from centering reference circle adjustable positioner, the device includes rack and pinion centering mechanism be provided with ratchet circumference positioning mechanism on the rack and pinion centering mechanism one side of ratchet circumference positioning mechanism is provided with the radial positioning mechanism of slide rail of being connected with ratchet circumference positioning mechanism. The utility model has the advantages of structural design is ingenious, easy operation is convenient, adopts it to adjust reference circle size and drilling quantity wantonly, and not only the location is accurate, but also can fix a position the centre of a circle fast, has improved machining efficiency, has practiced thrift time and cost.

Description

Self-centering positioning device with adjustable reference circle

Technical Field

The utility model relates to a positioner, especially a from centering reference circle adjustable positioner.

Background

The drilling refers to the operation of machining holes in solid materials by using a drill bit, and disc parts or stepped shaft parts are usually scribed, drilled, reamed and reamed in the mechanical machining. The existing technical scheme for large-batch processing mostly adopts a mode of manufacturing the drill jig, and if the processing hole position of a part is changed, such as the size of a reference circle is changed, the change of the number of drilled holes can cause the failure of the existing drill jig.

The name is disclosed in CN 204276985U: a rotary adjusting type utility model patent of a convex cover flange plate drilling clamp comprises a chassis, a mandrel and a drilling template, wherein the mandrel is vertically fixed in the center of the chassis, a plurality of chassis positioning pin holes are formed in the chassis and distributed on different circumferential angles, the distribution of the chassis positioning pin holes depends on the angle difference of upper and lower holes required by a workpiece, a ball rotating track ring groove is formed in the chassis, and balls are arranged on the ball rotating track ring groove to form a ball rotating track; the turntable is arranged on the ball rotation track and can rotate around the mandrel, angle scales are arranged on the periphery of the turntable and correspond to the angles distributed by chassis positioning pin holes on the chassis, a turntable positioning pin hole and a chassis positioning pin hole are arranged on the other side of the turntable with the same diameter at 0 degree in the angle scales and correspond to each other, the first positioning pin locks the turntable positioning pin hole and the corresponding chassis positioning pin hole, a workpiece positioning hole is arranged on the turntable, and a second positioning pin locks the workpiece; a drilling template is arranged at the upper end of the mandrel, and workpiece drilling hole sites are distributed on the drilling template; the upper part of the drilling template is provided with a U-shaped weight and a locking nut, and the locking nut is matched with the thread on the upper part of the mandrel.

Although the rotation regulation type convex cover flange plate drilling clamp can realize the regulation of the drilling angle by utilizing the separation of the drilling jig and the centering device, the following defects still exist: 1. the positioning of the drilling hole is still realized by the drill jig, and the reference circle cannot be adjusted at will. 2. The mandrel is fixed by means of chassis centering, and if the machined part changes, the device cannot be adjusted. 3. The whole device is heavy, the occupied size is large, a large height difference exists between the drilling jig and the workpiece, and the drilling processing difficulty is improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a can adjust the positioning device of the self-centering reference circle adjustable of reference circle size and drilling quantity wantonly.

The utility model aims at realizing through such technical scheme, a from centering reference circle adjustable positioner, the device includes rack and pinion centering mechanism be provided with ratchet circumference positioning mechanism on the rack and pinion centering mechanism one side of ratchet circumference positioning mechanism is provided with the slide rail radial positioning mechanism who is connected with ratchet circumference positioning mechanism.

The gear rack centering mechanism comprises a shell, a gear shaft with a gear is arranged in the shell, fixed bearings are arranged on the upper end face and the lower end face of the gear, and three racks which are uniformly distributed in the circumferential direction and meshed with the gear are arranged on the outer wall of the shell; a bearing gland is arranged on the shell, and the upper part of the gear shaft penetrates through the bearing gland; a hand wheel is arranged on the upper part of the gear shaft.

The ratchet wheel circumferential positioning mechanism comprises a ratchet wheel with a ratchet wheel shield, which is arranged on a gear shaft, and the ratchet wheel with the ratchet wheel shield is positioned between a bearing gland and a hand wheel; the ratchet wheel is fixed on the upper end surface of the bearing gland through the ratchet wheel gland, and the inner surface of the ratchet wheel shield is attached to the upper end surface of the ratchet wheel gland and covers the ratchet wheel; a positioning shaft sleeve is arranged on the upper end face of the ratchet wheel gland, a rotating bearing is arranged in the center of the positioning shaft sleeve, an L-shaped fixed connecting plate is arranged on the upper end face of the positioning shaft sleeve, and a pawl matched with the ratchet wheel is arranged on the inner side of the L-shaped fixed connecting plate; and an extension spring with one end connected with the L-shaped fixed connecting plate and the other end connected with the pawl is arranged at the corner of the L-shaped fixed connecting plate.

The sliding rail radial positioning mechanism comprises a support, adjusting guide rails are arranged on the inner walls of two sides of the support, a sliding drill jig is arranged on the adjusting guide rails, and rolling bearings A located in the adjusting guide rails are arranged at two ends of the sliding drill jig; the upper end face of the adjusting guide rail on one side is provided with a positioning screw hole, and the upper end face of the adjusting guide rail on the other side is provided with diameter scales; one end of the support is provided with a track end sleeve, and the other end of the support is connected with the outer wall of one end of the L-shaped fixed connecting plate.

In order to ensure the complete meshing of the three racks, the axial positioning of the bearing and the circumferential positioning of the hand wheel are realized, and the width of the gear is more than or equal to three times of the width of the rack.

In order to ensure the positioning accuracy, a guide groove is arranged on the side edge of the rack, and an arc-shaped scraper is arranged at the outer end of the rack.

In order to guide the rack, the shell is in a regular hexagon shape, a notch corresponding to the rack is formed in the circumferential direction of the shell, and the rack is arranged in the notch and slides along the notch.

In order to enable a single ratchet wheel to meet most machining requirements and improve the fault tolerance rate of matching with the pawl, the number of the ratchet wheel teeth is the least common multiple of the number of machining holes, and the thickness of the ratchet wheel is smaller than that of the pawl.

In order to reduce the installation space, increase the local degree of freedom to reduce wear and ensure unidirectional rotation, the pawl is arranged at the asymmetric center of the upper end face of the L-shaped fixed connecting plate, the cross section of the pawl is crescent, and a rolling bearing B is arranged at the tip of the pawl.

Since the technical scheme is used, the utility model has the advantages of structural design is ingenious, easy operation is convenient, adopt it to adjust reference circle size and drilling quantity wantonly, not only the location is accurate, but also can fix a position the centre of a circle fast, improved machining efficiency, time and cost have been practiced thrift.

Drawings

The drawings of the utility model are as follows:

fig. 1 is a schematic structural view of the present invention;

fig. 2 is a gear rack centering mechanism of the present invention;

FIG. 3 is a view of the ratchet wheel circumferential positioning mechanism of the present invention;

FIG. 4 is a radial positioning mechanism for slide rails according to the present invention;

fig. 5 is a reference diagram of the usage status of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention will be provided with reference to the accompanying drawings, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments will still fall within the scope of the present invention as claimed in the appended claims.

Example 1: as shown in fig. 1 and 5, the positioning device with adjustable self-centering reference circle comprises a rack-and-pinion centering mechanism, wherein a ratchet circumferential positioning mechanism is arranged on the rack-and-pinion centering mechanism, and a slide rail radial positioning mechanism connected with the ratchet circumferential positioning mechanism is arranged on one side of the ratchet circumferential positioning mechanism.

As shown in fig. 2, in order to fix the device to a part, the gear and rack centering mechanism includes a housing 1, a gear shaft 4 with a gear 5 is arranged in the housing 1, fixed bearings 2 are arranged on both the upper end surface and the lower end surface of the gear 5, and three racks 3 which are uniformly distributed in the circumferential direction and are meshed with the gear 5 are arranged on the outer wall of the housing 1; a bearing gland 6 is arranged on the shell 1, and the upper part of the gear shaft 4 penetrates through the bearing gland 6; a hand wheel 7 is arranged on the upper part of the gear shaft 4.

As shown in fig. 3, in order to facilitate the adjustment of the size of the indexing circle, the ratchet wheel circumferential positioning mechanism comprises a ratchet wheel 9 with a ratchet wheel shield 8, which is arranged on the gear shaft 4, and the ratchet wheel 9 with the ratchet wheel shield 8 is positioned between the bearing gland 6 and the hand wheel 7; the ratchet wheel 9 is fixed on the upper end surface of the bearing gland 6 through a ratchet wheel gland 10, and the inner surface of the ratchet wheel shield 8 is attached to the upper end surface of the ratchet wheel gland 10 and covers the ratchet wheel 9; a positioning shaft sleeve 11 is arranged on the upper end surface of the ratchet wheel gland 10, a rotating bearing 12 is arranged in the center of the positioning shaft sleeve 11, an L-shaped fixed connecting plate 13 is arranged on the upper end surface of the positioning shaft sleeve 11, and a pawl 14 matched with the ratchet wheel 9 is arranged on the inner side of the L-shaped fixed connecting plate 13; and an extension spring 15 with one end connected with the L-shaped fixed connecting plate 13 and the other end connected with the pawl 14 is arranged at the corner of the L-shaped fixed connecting plate 13.

As shown in fig. 4, in order to facilitate adjustment of the drilling position, the slide rail radial positioning mechanism includes a bracket 16, adjustment guide rails 17 are disposed on inner walls of both sides of the bracket 16, a sliding jig 18 is disposed on the adjustment guide rails 17, and rolling bearings a19 located in the adjustment guide rails 17 are disposed at both ends of the sliding jig 18; a positioning screw hole 20 is arranged on the upper end surface of the adjusting guide rail 17 on one side, and a diameter scale 21 is arranged on the upper end surface of the adjusting guide rail 17 on the other side; a track end sleeve 22 is arranged at one end of the support 16, and the other end of the support 16 is connected with the outer wall of one end of the L-shaped fixed connecting plate 13.

The utility model discloses a use like this: the device is arranged on the end face of a part 27 to be processed; manually shaking a hand wheel 7, wherein the hand wheel 7 drives a gear 5 to rotate through a gear shaft 4, so that a rack 3 extends out or retracts, an inner hole of a part is tightly jacked, or the excircle of the part is tightly gripped to finish the centering operation of the device; and then moving the sliding jig 18 to enable the sliding jig to be positioned on a reference circle of the hole to be machined, locking the diameter of the reference circle, then shifting the L-shaped fixed connecting plate 13 according to the number of the holes, and finally finishing machining by the drilling tool through the sliding jig 18.

Further, the width of the gear 5 is equal to or greater than three times the width of the rack 3. By doing so, can guarantee the complete meshing of three racks 3, realize the axial positioning to the bearing and the circumference location to the hand wheel.

Further, a guide groove 23 is provided at a side of the rack 3, and an arc-shaped scraper 24 is provided at an outer end of the rack 3. By doing so, the accuracy of centering can be guaranteed, and the laminating rate with the part is improved.

Further, the housing 1 is a regular hexagon, a notch 25 corresponding to the rack 3 is formed in the circumferential direction of the housing 1, and the rack 3 is disposed in the notch 25 and slides along the notch 25. By doing so, the gear 5 can be partially and completely wrapped inside, and a certain guiding effect is provided for the rack 3.

The utility model discloses in, ratchet 9 tooth number is the least common multiple of processing hole number, ratchet 9's thickness is less than the thickness of pawl 14. This allows a single ratchet 9 to meet most of the machining requirements, increasing the tolerance for cooperation with the pawl 14. The number of the machining holes is generally the number of the common machining holes, such as 2, 4, 8, 16, 32, etc.

Further, the pawl 14 is arranged at the asymmetric center of the upper end face of the L-shaped fixed connecting plate 13, the cross section of the pawl 14 is crescent, and a rolling bearing B26 is arranged at the tip of the pawl 14. By doing so, the installation space can be reduced, the local degree of freedom is increased to reduce abrasion, and unidirectional rotation is ensured.

Claims

1. The utility model provides a from centering reference circle adjustable positioner, characterized by: the device comprises a gear and rack centering mechanism, wherein a ratchet wheel circumferential positioning mechanism is arranged on the gear and rack centering mechanism, and a sliding rail radial positioning mechanism connected with the ratchet wheel circumferential positioning mechanism is arranged on one side of the ratchet wheel circumferential positioning mechanism.

2. The self-centering pitch circle adjustable positioning device of claim 1, wherein: the gear rack centering mechanism comprises a shell (1), a gear shaft (4) with a gear (5) is arranged in the shell (1), fixed bearings (2) are arranged on the upper end face and the lower end face of the gear (5), and three racks (3) which are uniformly distributed in the circumferential direction and meshed with the gear (5) are arranged on the outer wall of the shell (1); a bearing gland (6) is arranged on the shell (1), and the upper part of the gear shaft (4) penetrates through the bearing gland (6); a hand wheel (7) is arranged on the upper part of the gear shaft (4).

3. The self-centering pitch circle adjustable positioning device of claim 2, wherein: the ratchet wheel circumferential positioning mechanism comprises a ratchet wheel (9) which is arranged on the gear shaft (4) and is provided with a ratchet wheel shield (8), and the ratchet wheel (9) with the ratchet wheel shield (8) is positioned between the bearing gland (6) and the hand wheel (7); the ratchet wheel (9) is fixed on the upper end face of the bearing gland (6) through a ratchet wheel gland (10), and the inner surface of the ratchet wheel shield (8) is attached to the upper end face of the ratchet wheel gland (10) and covers the ratchet wheel (9); a positioning shaft sleeve (11) is arranged on the upper end surface of the ratchet wheel gland (10), a rotating bearing (12) is arranged at the center of the positioning shaft sleeve (11), an L-shaped fixed connecting plate (13) is arranged on the upper end surface of the positioning shaft sleeve (11), and a pawl (14) matched with the ratchet wheel (9) is arranged on the inner side of the L-shaped fixed connecting plate (13); and an extension spring (15) with one end connected with the L-shaped fixed connecting plate (13) and the other end connected with the pawl (14) is arranged at the corner of the L-shaped fixed connecting plate (13).

4. The self-centering pitch circle adjustable positioning device of claim 3, wherein: the radial positioning mechanism of the slide rail comprises a support (16), adjusting guide rails (17) are arranged on the inner walls of two sides of the support (16), a sliding jig (18) is arranged on the adjusting guide rails (17), and rolling bearings A (19) located in the adjusting guide rails (17) are arranged at two ends of the sliding jig (18); a positioning screw hole (20) is arranged on the upper end surface of the adjusting guide rail (17) on one side, and a diameter scale (21) is arranged on the upper end surface of the adjusting guide rail (17) on the other side; one end of the support (16) is provided with a track end sleeve (22), and the other end of the support (16) is connected with the outer wall of one end of the L-shaped fixed connecting plate (13).

5. The self-centering pitch circle adjustable positioning device of claim 4, wherein: the width of the gear (5) is more than or equal to three times of the width of the rack (3).

6. The self-centering pitch circle adjustable positioning device of claim 5, wherein: a guide groove (23) is arranged on the side edge of the rack (3), and an arc-shaped scraper (24) is arranged at the outer end of the rack (3).

7. The self-centering pitch circle adjustable positioning device of claim 6, wherein: the shell (1) is in a regular hexagon, a notch (25) corresponding to the rack (3) is formed in the circumferential direction of the shell (1), and the rack (3) is arranged in the notch (25) and slides along the notch (25).

8. The self-centering pitch circle adjustable positioning device of claim 7, wherein: the number of teeth of the ratchet wheel (9) is the least common multiple of the number of the machining holes, and the thickness of the ratchet wheel (9) is smaller than that of the pawl (14).

9. The self-centering pitch circle adjustable positioning device of claim 8, wherein: the pawl (14) is arranged at the asymmetric center of the upper end face of the L-shaped fixed connecting plate (13), the cross section of the pawl (14) is crescent, and a rolling bearing B (26) is arranged at the tip of the pawl (14).