Positioning mechanism

Abstract

The utility model provides a positioning mechanism, which comprises a dish-shaped pin shaft, a fixed end and a pressed end, the fixed end is fixed on a mounting surface, and the pressed end is fixed on the mounting surface. The pin shaft pressing rod is arranged at the pressed end of the dish-shaped pin shaft; when the dish-shaped pin shaft expands and deforms in the circumferential direction under the pressing action of the pin shaft pressing rod, the dish-shaped pin shaft is in interference fit with a positioning groove of a workpiece. According to the positioning mechanism, the positioning groove of the workpiece is innovatively used for fixing, the dish-shaped pin shaft is pressed and deformed in the positioning groove, the outer diameter of the deformed dish-shaped pin shaft is increased, the dish-shaped pin shaft is in interference fit with the positioning groove, positioning and fixing of the workpiece and the dish-shaped pin shaft are completed, and effective positioning is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of workpiece positioning and processing mechanisms, and specifically relates to a positioning mechanism. Background Art

[0002] When a workpiece is undergoing surface processing, it is usually necessary to use a positioning mechanism to limit its position. The conventional positioning method is achieved using a tooling fixture, which is usually clamped from both ends by a clamping device. However, for a workpiece with a hole in the middle, when its outer wall needs to be processed, the two ends cannot be effectively clamped. Therefore, a positioning mechanism is needed to achieve effective positioning of the workpiece with a circular hole in the middle. Utility Model Content

[0003] In order to overcome the above technical defects, the utility model provides a positioning mechanism, which can solve the technical problem of ineffective positioning in the prior art.

[0004] The utility model is implemented according to the following technical solutions:

[0005] The utility model provides a positioning mechanism, which includes:

[0006] A disc-shaped pin shaft, which is provided with a fixed end and a pressure-bearing end, wherein the fixed end is fixed on a mounting surface;

[0007] A pin pressure rod, which is arranged at the pressure-bearing end of the disc-shaped pin;

[0008] The disc-shaped pin shaft expands and deforms in the circumferential direction under the pressure of the pin shaft pressure rod, so that the disc-shaped pin shaft and the positioning groove of the workpiece are interference-fitted.

[0009] Compared with the prior art, the positioning mechanism of the present application innovatively utilizes the positioning groove of the workpiece for fixing. The disc-shaped pin is compressed and deformed in the positioning groove. The outer diameter of the deformed disc-shaped pin increases, so that the disc-shaped pin and the positioning groove have an interference fit, completing the positioning and fixation of the workpiece and the disc-shaped pin, and achieving effective positioning.

[0010] In one embodiment, the disc-shaped pin shaft is provided with a deformation portion, and the deformation portion is located between the fixed end and the pressure-bearing end;

[0011] When the disc-shaped pin is subjected to axial pressure from the pin pressure rod, the deformation portion expands and deforms in the circumferential direction;

[0012] When the disc-shaped pin loses the axial pressure from the pin pressure rod, the deformation portion contracts and returns to its original position under the elastic restoring force.

[0013] In one embodiment, the pressure-bearing end is arranged obliquely relative to the deformation portion.

[0014] In one embodiment, the disc-shaped pin shaft is a hollow structure, and the pressure-bearing end is provided with a through hole;

[0015] The tail of the pin shaft pressure rod passes through the through hole and is threadedly connected to the mounting surface, and the head of the pin shaft pressure rod abuts against the pressure-bearing end.

[0016] In one embodiment, the disc-shaped pin shaft is provided with a mounting portion, and the mounting portion is arranged at the fixed end; the mounting portion is mounted and connected to the mounting surface via a fixing screw.

[0017] In one embodiment, the mounting portion is arranged on the periphery of the dish-shaped pin shaft.

[0018] In one embodiment, the positioning mechanism further comprises a pressing sleeve, the pressing sleeve is arranged above the disc-shaped pin shaft, and a pressing end is provided at one end of the pressing sleeve close to the disc-shaped pin shaft;

[0019] When the pressing sleeve is positioned and matched with the workpiece, the pressing end abuts against the positioning portion in the positioning groove.

[0020] In one embodiment, the pressing sleeve is a hollow structure, and an opening is provided at one end of the pressing sleeve close to the disc-shaped pin shaft;

[0021] The head of the pin pressure rod is accommodated in the opening.

[0022] In one embodiment, a through hole is provided at one end of the pressing sleeve away from the disc-shaped pin shaft;

[0023] The positioning mechanism also includes a locking piece, the tail of which passes through the through hole and is threadedly connected with the head of the pin shaft pressure rod, and the head of the locking piece abuts against the pressure sleeve.

[0024] In one embodiment, when the pressing sleeve is deformed under the pressure of the locking member, the pressing sleeve and the positioning groove are interference fit. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0026] Figure 1 A three-dimensional diagram of the assembly of the positioning mechanism of the utility model and the workpiece;

[0027] Figure 2 It is a front view of the assembly of the positioning mechanism and the workpiece of the utility model;

[0028] Figure 3 It is a cross-sectional view of the assembly of the positioning mechanism of the utility model and the workpiece;

[0029] Figure 4It is a schematic diagram of the pin pressure rod of the utility model.

[0030] Description of reference numerals:

[0031] 10 dish-shaped pin, 110 fixed end, 120 pressure end, 130 deformation part, 140 installation part, 20 workpiece, 210 positioning groove, 211 first section, 212 second section, 213 step surface, 30 pin pressure rod, 301 head of pin pressure rod, 302 tail of pin pressure rod, 40 pressing sleeve, 410 opening, 50 locking member, 501 head of locking member, 502 tail of locking member, 60 bottom plate. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0033] In order to better illustrate the present invention, the present invention is further described in detail below with reference to the accompanying drawings.

[0034] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the present application.

[0035] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0036] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0037] In addition, in the description of this application, unless otherwise specified, "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0038] Example 1

[0039] Combination Figures 1 to 4 As shown, the utility model provides a positioning mechanism, which includes: a disc-shaped pin 10, which is provided with a fixed end 110 and a pressure end 120, and the fixed end 110 is fixed on a mounting surface; a pin pressure rod 30, which is arranged at the pressure end 120 of the disc-shaped pin 10; when the disc-shaped pin 10 expands and deforms in the circumferential direction under the pressure of the pin pressure rod 30, the disc-shaped pin 10 is interference-fitted with the positioning groove 210 of the workpiece.

[0040] The specific process of assembling the workpiece 20 and the positioning mechanism is as follows: align the positioning groove 210 of the workpiece 20 with the disc-shaped pin 10 and place it, at which time the workpiece 20 is sleeved on the periphery of the disc-shaped pin 10; then operate the pin pressure rod 30 with the help of a tool, so that the pin pressure rod 30 applies pressure to the disc-shaped pin 10, causing the disc-shaped pin 10 to be compressed and deformed in the positioning groove 210, and the outer diameter of the deformed disc-shaped pin 10 increases, so that the disc-shaped pin 10 and the positioning groove 210 have an interference fit, completing the positioning and fixation of the workpiece 20 and the disc-shaped pin 10, achieving effective positioning, and the positioning accuracy can reach 0.01mm, with good stability, which can meet the needs of workpieces 20 with high precision requirements and the processing of the outer wall of the workpiece 20.

[0041] Compared with the prior art, the positioning mechanism of the present application innovatively utilizes the positioning groove 210 of the workpiece 20 for fixing. The disc pin 10 is compressed and deformed in the positioning groove 210. The outer diameter of the deformed disc pin 10 increases, so that the disc pin 10 and the positioning groove 210 have an interference fit, completing the positioning and fixing of the workpiece 20 and the disc pin 10, and achieving effective positioning.

[0042] In this embodiment, the disc pin 10 is provided with a deformation portion 130, and the deformation portion 130 is located between the fixed end 110 and the pressure-bearing end 120; when the disc pin 10 is subjected to axial pressure from the pin pressure rod 30, the deformation portion 130 expands and deforms in the circumferential direction; when the disc pin 10 loses the axial pressure from the pin pressure rod 30, the deformation portion 130 contracts and resets under the elastic restoring force.

[0043] Specifically, the pin pressure rod 30 applies axial pressure to the pressure-bearing end 120 of the disc-shaped pin 10, and the deformation portion 130 expands and deforms in the circumferential direction, and the outer diameter is increased; when the applied pressure reaches a certain value, the deformation of the deformation portion 130 also reaches a certain degree, and the original gap between the disc-shaped pin 10 and the positioning groove 210 is filled, and the deformation portion 130 and the positioning groove 210 are interference fit to achieve fixation of the workpiece 20.

[0044] When the workpiece 20 needs to be removed, the pin pressure rod 30 no longer applies pressure to the pressure end 120 of the disc-shaped pin 10, and the disc-shaped pin 10 loses the axial pressure from the pin pressure rod 30. The deformation portion 130 shrinks and resets under the elastic restoring force, and the outer diameter is reduced, so that a gap is formed between the disc-shaped pin 10 and the positioning groove 210, making it convenient to remove the workpiece 20.

[0045] It should be noted that the axial direction refers to the axial direction of the disc-shaped pin 10 .

[0046] Furthermore, the disc-shaped pin 10 is designed in an integrated manner, and is preferably made of a metal material or alloy material with good elasticity, so that the elastic pin of this embodiment has good elastic recovery ability for repeated use. In addition, the disc-shaped pin 10 with an integrated design is strong in resistance to transitional deformation, durable, simple in structure, low in manufacturing cost, and easy to manufacture.

[0047] Furthermore, the pressure-bearing end 120 is inclined relative to the deformation portion 130, and the angle between the pressure-bearing end 120 and the deformation portion 130 is an obtuse angle, so that when the pressure-bearing end 120 is subjected to axial pressure from the pin shaft pressure rod 30, the axial force can be decomposed into circumferential force, thereby better realizing the deformation of the deformation portion 130.

[0048] In this embodiment, the disc-shaped pin shaft 10 is a hollow structure, and the pressure-bearing end 120 is provided with a through hole arranged therethrough; the pin shaft pressure rod 30 includes a head and a tail, and the tail portion 302 of the pin shaft pressure rod passes through the through hole and is threadedly connected to the mounting surface, and the head portion 301 of the pin shaft pressure rod is against the pressure-bearing end 120.

[0049] Specifically, the pin pressure rod 30 of this embodiment is connected to the installation surface by threaded matching, the tail 302 of the pin pressure rod is provided with an external thread, and the installation surface is provided with a mounting hole with an internal thread. The staff tightens the pin pressure rod 30 to change the distance between the head 301 of the pin pressure rod and the installation surface, so that the head 301 of the pin pressure rod is against the pressure end 120, and the disc pin 10 is pressed, so that the disc pin 10 and the positioning groove 210 are interference-fitted. When the workpiece 20 needs to be removed, the staff loosens the pin pressure rod 30, and the pin pressure rod 30 no longer applies pressure to the pressure end 120 of the disc pin 10, and the disc pin 10 loses the axial pressure from the pin pressure rod 30, so that a gap is formed between the disc pin 10 and the positioning groove 210, which facilitates the removal of the workpiece 20.

[0050] In this embodiment, the disc-shaped pin shaft 10 is provided with a mounting portion 140 , and the mounting portion 140 is arranged at the fixed end 110 ; the mounting portion 140 is mounted and connected to the mounting surface via fixing screws, thereby achieving the installation of the disc-shaped pin shaft 10 and the mounting surface.

[0051] Furthermore, the positioning mechanism further comprises a mounting base plate 60, wherein the mounting base plate 60 has the mounting surface, and the disc-shaped pin shaft 10 is mounted and fixed on the mounting surface. Preferably, the base plate 60 is connected to the mounting portion 140 by fixing screws.

[0052] Furthermore, the mounting portion 140 is disposed on the periphery of the dish-shaped pin shaft 10. In this embodiment, the mounting portion 140 is used to abut against the workpiece 20 to support and limit the workpiece 20 to determine the position of the workpiece 20, and then the staff tightens the pin shaft pressure rod 30 to make the dish-shaped pin shaft 10 and the positioning groove 210 have an interference fit.

[0053] Example 2

[0054] The difference between this embodiment and embodiment 1 is that, in this embodiment, the disc-shaped pin shaft 10 is a hollow structure, and the pressure-bearing end 120 is provided with a through hole arranged therethrough; the pin shaft pressure rod 30 includes a head and a tail, and the tail portion 302 of the pin shaft pressure rod passes through the through hole and is threadedly connected to the bottom of the disc-shaped pin shaft 10, and the head portion 301 of the pin shaft pressure rod is against the pressure-bearing end 120.

[0055] Example 3

[0056] Combination Figures 1 to 4 As shown, the difference between this embodiment and embodiment 1 is that this embodiment is optimized in design relative to embodiment 1.

[0057] In this embodiment, the positioning mechanism further includes a press sleeve 40, which is arranged above the disc-shaped pin shaft, and a clamping end is provided at one end of the press sleeve close to the disc-shaped pin shaft; when the press sleeve is positioned and matched with the workpiece, the clamping end abuts against the positioning portion in the positioning groove. Specifically, after the disc-shaped pin shaft 10 and the positioning groove 210 are interference-fitted, the staff inserts the press sleeve 40 into the positioning groove 210, and the press sleeve 40 abuts against the positioning portion in the positioning groove, which is used to apply pressure to the workpiece 20 in the axial direction, thereby clamping the workpiece 20, so as to cooperate with the disc-shaped pin shaft 10 to install and fix the workpiece 20.

[0058] Among them, in this embodiment, the positioning portion in the positioning groove is a step surface 213, and the positioning groove 210 is provided with a step surface 213, and the step surface 213 divides the positioning groove 210 into a first section 211 and a second section 212, and the diameter of the first section 211 is smaller than the diameter of the second section 212; the first section 211 is provided corresponding to the disc pin shaft 10; the second section 212 is provided corresponding to the pressing sleeve 40; in this embodiment, the pressing end of the pressing sleeve 40 is against the step surface 213.

[0059] In other embodiments, the positioning portion may be a positioning piece extending inwardly.

[0060] Furthermore, the pressing sleeve 40 is a hollow structure, and an opening 410 is provided at one end of the pressing sleeve 40 close to the disc-shaped pin shaft 10; the head 301 of the pin shaft pressure rod is accommodated in the opening 410, so that the structure of the pressing sleeve 40 can be used to accommodate the head 301 of the pin shaft pressure rod, thereby rationally utilizing the space.

[0061] Furthermore, a through hole is provided at one end of the press sleeve 40 away from the disc-shaped pin shaft 10; the positioning mechanism further comprises a locking member 50, the tail portion 502 of the locking member passes through the through hole and is threadedly connected with the head portion 301 of the pin shaft pressure rod, and the head portion 501 of the locking member abuts against the press sleeve 40. Specifically, the head portion 301 of the pin shaft pressure rod is provided with a threaded hole, and the tail portion 502 of the locking member is provided with an external thread. The staff tightens the locking member 50 to change the distance between the head portion 501 of the locking member and the head portion 301 of the pin shaft pressure rod, so that the head portion 501 of the locking member abuts against the press sleeve 40, presses the press sleeve 40, and thereby presses the workpiece 20. Among them, the locking piece 50 is a screw; the head 301 of the pin shaft pressure rod is provided with an empty groove that cooperates with an Allen wrench, the diameter of the empty groove is larger than the diameter of the threaded hole, and the empty groove is provided with an active surface that cooperates with the Allen wrench, so that the tightening operation of the locking piece 50 and the pin shaft pressure rod 30 is not affected.

[0062] Furthermore, when the pressing sleeve 40 is deformed under the pressure of the locking member 50, the pressing sleeve 40 is interference fit with the second section 212 of the positioning groove 210. The staff tightens the locking member 50 with the help of a tool, so that the pin pressure rod 30 applies pressure to the pressing sleeve 40, causing the pressing sleeve 40 to be deformed under pressure in the positioning groove 210. The outer diameter of the deformed pressing sleeve 40 increases, so that the pressing sleeve 40 is interference fit with the second section 212 of the positioning groove 210, thereby achieving effective positioning.

[0063] The specific process of assembling the workpiece 20 and the positioning mechanism is as follows: align the positioning groove 210 of the workpiece 20 with the disc-shaped pin shaft 10 and place it. At this time, the workpiece 20 is sleeved on the periphery of the disc-shaped pin shaft 10, and under the support and positioning of the mounting portion 140, the first section 211 is arranged corresponding to the disc-shaped pin shaft 10; the staff then tightens the pin shaft pressure rod 30 in a clockwise manner with the help of a tool (an inner hexagonal wrench), so that the pin shaft pressure rod 30 applies pressure to the disc-shaped pin shaft 10, so that the disc-shaped pin shaft 10 is compressed and deformed in the positioning groove 210, and the outer diameter of the deformed disc-shaped pin shaft 10 increases, so that the disc-shaped pin shaft 10 and the positioning groove 210 are interference-fitted, thereby completing the positioning and fixing of the workpiece 20 and the disc-shaped pin shaft 10;

[0064] Subsequently, the staff puts the pressing sleeve 40 into the positioning groove 210, and the pressing sleeve 40 abuts against the step surface 213. The staff tightens the locking piece 50 with the help of a tool (an Allen wrench), so that the pin pressure rod 30 applies pressure to the pressing sleeve 40, causing the pressing sleeve 40 to be compressed and deformed in the positioning groove 210. The outer diameter of the deformed pressing sleeve 40 increases, so that the pressing sleeve 40 and the second section 212 of the positioning groove 210 have an interference fit, thereby achieving effective positioning.

[0065] According to the disclosure and teaching of the above description, the technical personnel in the field to which the utility model belongs can also change and modify the above implementation. Therefore, the utility model is not limited to the specific implementation methods disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the utility model.

Claims

1. A positioning mechanism, characterized in that: include: A disc-shaped pin shaft, which is provided with a fixed end and a pressure-bearing end, wherein the fixed end is fixed on a mounting surface; A pin pressure rod, which is arranged at the pressure-bearing end of the disc-shaped pin; The disc-shaped pin shaft expands and deforms in the circumferential direction under the pressure of the pin shaft pressure rod, so that the disc-shaped pin shaft and the positioning groove of the workpiece are interference-fitted.

2. The positioning mechanism according to claim 1, characterized in that: The disc-shaped pin shaft is provided with a deformation portion, and the deformation portion is located between the fixed end and the pressure-bearing end; When the disc-shaped pin is subjected to axial pressure from the pin pressure rod, the deformation portion expands and deforms in the circumferential direction; When the disc-shaped pin loses the axial pressure from the pin pressure rod, the deformation portion contracts and returns to its original position under the elastic restoring force.

3. The positioning mechanism according to claim 2, characterized in that: The pressure-bearing end is arranged obliquely relative to the deformation portion.

4. The positioning mechanism according to claim 2, characterized in that: The disc-shaped pin shaft is a hollow structure, and the pressure-bearing end is provided with a through hole; The tail of the pin shaft pressure rod passes through the through hole and is threadedly connected to the mounting surface, and the head of the pin shaft pressure rod abuts against the pressure-bearing end.

5. The positioning mechanism according to claim 1, characterized in that: The disc-shaped pin shaft is provided with a mounting portion, and the mounting portion is arranged at the fixed end; the mounting portion is mounted and connected to the mounting surface via a fixing screw.

6. The positioning mechanism according to claim 5, characterized in that: The mounting portion is arranged on the periphery of the dish-shaped pin shaft.

7. The positioning mechanism according to any one of claims 1 to 6, characterized in that: The positioning mechanism further comprises a pressing sleeve, which is arranged above the disc-shaped pin shaft, and a pressing end is provided at one end of the pressing sleeve close to the disc-shaped pin shaft; When the pressing sleeve is positioned and matched with the workpiece, the pressing end abuts against the positioning portion in the positioning groove.

8. The positioning mechanism according to claim 7, characterized in that: The pressing sleeve is a hollow structure, and an opening is provided at one end of the pressing sleeve close to the disc-shaped pin shaft; The head of the pin pressure rod is accommodated in the opening.

9. The positioning mechanism according to claim 8, characterized in that: A through hole is provided at one end of the pressing sleeve away from the disc-shaped pin shaft; The positioning mechanism also includes a locking piece, the tail of which passes through the through hole and is threadedly connected with the head of the pin shaft pressure rod, and the head of the locking piece abuts against the pressure sleeve.

10. The positioning mechanism according to claim 9, characterized in that: When the pressing sleeve is deformed under the pressure of the locking member, the pressing sleeve and the positioning groove are interference fit.

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