CN111452119A

CN111452119A - Pin clamping device

Info

Publication number: CN111452119A
Application number: CN202010269863.4A
Authority: CN
Inventors: 文铁琦; 黎勇军; 姜华
Original assignee: Shenzhen Hans CNC Technology Co Ltd
Current assignee: Shenzhen Hans CNC Technology Co Ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2020-07-28
Anticipated expiration: 2040-04-08
Also published as: CN111452119B

Abstract

The invention relates to the field of locating pin clamps, in particular to a pin clamping device which comprises a clamping seat assembly and an inclined wedge block, wherein the clamping seat assembly is provided with a clamping groove, the inclined wedge block is arranged on the clamping groove in a sliding mode and is provided with a clamping surface, a limiting part capable of abutting against the side face of a pin is arranged at the clamping end of the clamping groove, the inclined wedge block is pressed to the clamping end under the action of external force, and the clamping surface is pressed towards the pin to the limiting part so as to clamp the pin, the sliding direction of the inclined wedge block is perpendicular to the moving direction of a PCB, the clamping surface and the moving direction of the inclined wedge block form β degrees, β degrees is more than or equal to 60 degrees, the influence of the inertial force on the inclined wedge block can be effectively reduced by limiting the moving direction of the inclined wedge block to be perpendicular to the moving direction of the PCB, the clamping effect of the pin is guaranteed, and the clamping surface is arranged on the inclined wedge block, namely, the inclined wedge block is clamped between the.

Description

Pin clamping device

Technical Field

The invention relates to the field of positioning pin fixtures, in particular to a pin clamping device.

Background

The PCB material processing method is characterized in that a clamping and positioning device is generally adopted to clamp and position positioning pins on materials, in order to improve efficiency, most production enterprises adopt a plurality of layers of PCB board pins to process, when a drill bit drills from top to bottom, the vertical posture of pin clamping is very important, if the pins are inclined, the hole position precision of an interlayer PCB board is influenced, in the same enterprise, for the requirement of efficiency and management, only one specification of positioning pins are generally adopted, such as a typical pin with the diameter of 3.175X15.8, if more boards are processed and overlapped once, the clamping length of the clamping device is shorter, meanwhile, the weight of the processed materials is heavier, the reciprocating inertia force generated in the process of sudden opening and stopping of a workbench is larger, the positioning precision of the pins in the clamping device is influenced, the situation that the pins fall off is possible, a pneumatic clamp control device L201320373015.3 is provided, and the problem that the clamping posture of the materials is not solved.

Accordingly, the prior art is yet to be improved and developed.

Disclosure of Invention

In view of the defects of the prior art, the invention aims to provide a pin clamping device, which solves the problem that the existing pin clamping device cannot solve the problem that a pin is unstable and loosens in the movement process of the device, so that the clamping effect is poor.

The technical scheme of the invention is as follows:

the invention provides a pin clamping device which is used for clamping a pin to be in a vertical posture so as to position a PCB (printed circuit board), and comprises a clamping seat assembly provided with a clamping groove and an inclined wedge block which is arranged on the clamping groove in a sliding mode and is provided with a clamping surface, wherein a limiting part capable of abutting against the side surface of the pin is arranged at the clamping end of the clamping groove, the inclined wedge block is pressed to the clamping end under the action of external force, and the clamping surface is pressed to the limiting part of the pin so as to clamp the pin, wherein the sliding direction of the inclined wedge block is vertical to the moving direction of the PCB, the clamping surface and the moving direction of the inclined wedge block form β degrees, and the angle of 30- β degrees is not more than 60 degrees.

Further preferred embodiments of the present invention are: the pin clamping device further comprises a power assembly used for driving the inclined wedge block to slide on the clamping groove, the inclined wedge block is pressed to the clamping end under the driving of the power assembly, and the clamping surface is pressed towards the pin to the limiting portion so as to clamp the pin.

Further preferred embodiments of the present invention are: the clamping surface is a curved surface with a convex middle part.

Further preferred embodiments of the present invention are: one end of the wedge block is also provided with a notch for containing dust and processing scraps, and the notch is arranged on the lower side of the clamping surface.

It is a further preferred embodiment of the present invention that β is 45 °.

Further preferred embodiments of the present invention are: the limiting part is a right-angle end face.

The power assembly further preferably comprises a wedge pulling fork which is rotatably arranged on the clamping seat assembly and used for driving the wedge block to move, and a driving cylinder which is rotatably connected with one end of the wedge pulling fork, wherein the other end of the wedge pulling fork is movably connected with the wedge block through a limiting shaft and a waist-shaped hole, one of the waist-shaped hole and the limiting shaft is arranged on the wedge pulling fork, the other is arranged on the wedge block, when the limiting part is matched with the wedge block to clamp a pin, a normal line of the circular arc contact of the inner wall of the waist-shaped hole and the limiting shaft is α degrees with the moving direction of the wedge block, wherein 0 degree is more than α degrees and less than 15 degrees.

Further preferred embodiments of the present invention are: the clamping seat assembly comprises a mounting plate, a guide cover plate arranged on the mounting plate and a fixed block arranged at one end of the guide cover plate; the clamping groove comprises a guide groove and a limiting groove arranged at one end of the guide groove; the limiting groove is formed in the fixing block, the guide groove is formed in the guide cover plate, and the limiting portion is arranged on the limiting groove.

It is a further preferred embodiment of the present invention that α is 10 °.

Further preferred embodiments of the present invention are: the pin clamping device further comprises a spring for providing clamping force, one end of the spring is fixed on the mounting plate, and the other end of the spring is fixed on the wedge shifting fork.

Further preferred embodiments of the present invention are: the pin clamping device also comprises a fixed strip arranged on the mounting plate, a movable strip matched with the fixed strip to clamp the pin, a first driving rod and a second driving rod used for driving the movable strip to be far away from or close to the fixed strip, and a connecting rod connected with the first driving rod and the second driving rod; the first driving rod and the second driving rod are rotatably arranged on the mounting plate, and the second driving rod is rotatably connected with the other end of the driving cylinder.

The invention has the beneficial effects that: the movement direction of the inclined wedge block is limited to be perpendicular to the movement direction of the PCB, so that the influence of inertia force on the inclined wedge block can be effectively reduced, and the clamping effect of the pin is ensured; and then through set up the clamping face on the tapered wedge, and establish the tapered wedge card between pin and centre gripping groove through external force promptly, can further improve the effect of centre gripping.

Drawings

FIG. 1 is an exploded view of a pin holder assembly according to an embodiment of the invention;

FIG. 2 is a schematic structural view of a pin clamping device according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of FIG. 2;

FIG. 4 is a partial exploded view of a pin holder assembly of an embodiment of the present invention;

FIG. 5 is a force analysis diagram of a pin clamping device according to an embodiment of the present invention;

FIG. 6 is a partial perspective view of a pin clamping device of an embodiment of the present invention;

FIG. 7 is a schematic structural view of a sprag according to an embodiment of the invention;

FIG. 8 is a schematic view of a pin clamp of an embodiment of the present invention;

FIG. 9 is a first schematic view of a pin clamp (non-curved surface) according to an embodiment of the present invention;

FIG. 10 shows a pin clamp (non-curved) of an embodiment of the invention in accordance with a second aspect.

Detailed Description

The present invention provides a pin clamping device, which will be described in further detail below with reference to the accompanying drawings and examples in order to make the objects, technical solutions and effects of the present invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The pin clamping device provided by the embodiment of the invention is used for clamping a pin 5 to be in a vertical posture so as to position a PCB (printed circuit board) (not shown in the figures), and also referring to the figures 1-10, the pin clamping device comprises a clamping seat component 1 provided with a clamping groove 2 and an inclined wedge block 3 which is arranged on the clamping groove 2 in a sliding mode and is provided with a clamping surface 31, a limiting part 21 capable of abutting against the side surface of the pin is arranged at the clamping end of the clamping groove 2, the inclined wedge block 3 is pressed to the clamping end under the action of external force, and the clamping surface 31 is pressed to the pin 5 to the limiting part 21 so as to clamp the pin 5, wherein the sliding direction of the inclined wedge block 3 is vertical to the moving direction of the PCB, the clamping surface 31 and the moving direction of the inclined wedge block 3 form β degrees, and 30 degrees and β degrees are not.

The inclined wedge block 3 is clamped between the pin 5 and the upper wall surface of the clamping groove 2.

The movement direction of the inclined wedge block 3 is limited to be perpendicular to the movement direction of the PCB, namely the loosening direction of the inclined wedge block 3 is limited to be perpendicular to the movement direction of the PCB, so that the influence of the inertia force of the movement of the PCB on the inclined wedge block 3 can be effectively reduced, and the clamping effect of the pin 5 is ensured;

through set up clamping face 31 on tapered wedge 3 again, and establish tapered wedge 3 card between pin 5 and centre gripping groove 2 through external force promptly, can realize pasting tight fit between clamping face 31, spacing portion 21 and the pin 5, in PCB board motion process, even external force appears discontinuously, pin 5 can not become flexible yet, guarantees the effect of centre gripping.

Furthermore, the clamping and fixing effect can be improved by limiting β to 30-60 degrees, wherein β is 45 degrees, the best fixing effect is achieved, and in other embodiments, matching inclined surfaces for clamping can be added on the wedge block 3 and the clamping groove 2, so that the clamping effect of the wedge block 3 can be further improved.

Further, the pin clamping device further comprises a power assembly 4 used for driving the wedge 3 to slide on the clamping groove 2, the wedge 3 is pressed to the clamping end under the driving of the power assembly 4, and the clamping surface 31 is pressed to the pin 5 to the limiting portion 21 to clamp the pin 5. Through increasing power component 4, can compress tightly drive tapered wedge 3 to the exposed core, realize the function of 3 fastening dowel 5 of tapered wedge, convenient and fast, fixed effectual.

Further, as shown in fig. 8, the clamping surface 31 is a curved surface with a convex middle part. In actual production, all machined parts have form and position errors, when the clamping surface 31 is a straight surface and the machining precision is poor, line contact cannot be guaranteed, and the contact conditions shown in fig. 9 and 10 may occur, wherein the contact points are a or B respectively. When the inertial force generated by the material changes direction (the PCB board is reciprocated), the pin 5 may shake, resulting in inaccurate positioning and even a situation where the pin 5 falls out of the pin holder. Through setting up clamping face 31 for the bellied curved surface in middle part, can effectually reduce the machining precision requirement of clamping face 31, the effectual clamping face 31 slope that prevents to lead to because of machining error guarantees the clamping effect.

Further, as shown in fig. 7, one end of the wedge 3 is further provided with a notch 32 for accommodating dust and machining debris, and the notch 32 is disposed below the clamping surface 31. Be used for holding the processing piece and the dust that appear in the course of working through increasing a breach, can effectual reduction processing piece and dust to the influence of pin 5 location, guarantee the centre gripping effect of pin 5.

Further, as shown in fig. 4 and 6, the stopper 21 is a right-angled end surface. Two faces through the right angle end face and the clamping face 31 clamp the pin 5 tightly, the pin 5 can be fixed from three points, and the fixing device has the characteristics of good fixing effect, simple structure, low processing cost and the like. In other embodiments, the limiting portion 21 may be provided as an arc-shaped groove adapted to the pin 5, and the positioning and clamping functions may also be achieved.

Further, the clamping seat assembly 1 comprises a mounting plate 11, a guide cover plate 12 arranged on the mounting plate 11, and a fixing block 13 arranged at one end of the guide cover plate 12; the clamping groove 2 comprises a guide groove 22 and a limiting groove 23 arranged at one end of the guide groove 22; the limiting groove 23 is disposed on the fixing block 13, the guide groove 22 is disposed on the guide cover plate 12, and the limiting portion 21 is disposed on the limiting groove 23. In this embodiment, the clamping seat assembly 1 is configured as the mounting plate 11, the guide cover plate 12, and the fixing block 13, so that the wedge 3 can be conveniently mounted.

In addition, the wedge 3 can rub against the guide groove 22, the limiting groove 23 and the pin 5 during operation. Wherein, the contact surface (the spacing groove 23 and the wedge block 3) of the clamping pin 5 is very small, so the local stress is very large and the abrasion is easy, the local heat treatment improves the hardness of the contact part (the spacing part 21 and the clamping surface 31) with the pin 5, the abrasion can be greatly reduced, thereby ensuring the vertical posture of the pin 5. The friction between the guide groove 22 and the mounting plate 11 with the wedge 3 is negligible due to the large contact area, and even if the friction is worn, the contact point position with the pin 5 is not changed due to the wedging effect and the convex curved surface of the clamping surface 31, so that the heat treatment of the guide groove 22 is not needed, and the production cost can be effectively reduced.

Further, one end of the wedge 3 close to the clamping surface 31 is further provided with a limiting protrusion 33, and by adding the limiting protrusion 33, the wedge 3 can be prevented from sliding away from the guide groove 22, and the stability of the device is ensured.

Further, the power assembly 4 comprises a wedge fork 41 rotatably arranged on the clamping seat assembly 1 and used for driving the wedge block 3 to move, and a driving cylinder 42 rotatably connected with one end of the wedge fork 41; the other end of the wedge shifting fork 41 is movably connected with the wedge 3 through a limiting shaft 61 and a waist-shaped hole 62, one of the waist-shaped hole 62 and the limiting shaft 61 is arranged on the wedge shifting fork 41, and the other is arranged on the wedge 3; the driving cylinder 42 drives the wedge shifting fork 41 to rotate, so that the wedge block 3 can be driven to perform clamping and loosening actions, and the wedge shifting fork is simple in structure, convenient and fast.

Furthermore, when the limiting part 21 is matched with the wedge 3 to clamp the pin 5, the normal line of the circular arc contact of the inner wall of the waist-shaped hole 62 and the limiting shaft 61 is arranged at α degrees with the moving direction of the wedge 3, wherein, the angle of 0 degree is more than α and less than 15 degrees, in the actual processing process, due to the processing technology, a notch (O point) appears at the connecting part of the guide cover plate 12 and the fixed block 13, and the situation of clockwise rotation around the O point appears after the wedge 3 is loosened.

Furthermore, the α is 10 °. the force exerted by the wedge fork 41 on the pin 5 is F1, when α is 10 degrees, F1y ═ F567 ═ sin80 ° -0.985F 1, F1x ═ F1 ═ sin10 ° -0.174F 1, so that after each clamping of the clamping pin 5, the clamping force exerted horizontally by the wedge 3 is almost equal to the reaction force exerted by the wedge fork 41 (1 ≈ 0.985), and furthermore the wedge 3 is caused to exert a relatively large pressure F1x on the clamping groove 2, it is known from the force analysis in fig. 5 that, after the wedge 3 clamps the pin 5, the moment exerted on the wedge 3 makes its position necessarily close to the inner wall of the clamping groove 2, so that the direction of loosening of the wedge 3 is perpendicular to the direction of movement of the worktable, when the pin clamping device moves with high acceleration of the worktable, the inertia force is very hard to change between the clamping force exerted on the clamping groove 2 and the clamping groove 3, and the clamping force exerted by the air pressure of the clamping groove 3 is very high enough to ensure that the clamping force exerted by the clamping cylinder 3 is not to loosen the clamping groove 2 (the clamping groove 3), so that the clamping of the clamping groove 3, even if the clamping groove 3, the clamping force is very large clamping groove 3, the clamping force exerted by the cylinder, the clamping groove 3, the clamping force is very large clamping force exerted by the cylinder, and the clamping groove 3, the clamping force is very large clamping groove 3, thus the cylinder, the clamping force is very large clamping force is very hard to be changed to be very hard to be loosened by the clamping force exerted to be.

Further, as shown in fig. 2 and 7, the pin clamping device further comprises a spring 7 for providing a clamping force, wherein one end of the spring 7 is fixed on the mounting plate 11, and the other end of the spring 7 is fixed on the wedge yoke 41. Through increasing a spring 7 and providing the clamp force, can guarantee the stability of centre gripping, the effectual prevention drives that the pin 5 that actuating cylinder gas break leads to is not hard up. Wherein, the spring 7 can be a compression spring or an extension spring, and the installation positions of the two are just opposite. In this embodiment, the spring 7 is an extension spring.

Further, as shown in fig. 2 and 6, the pin clamping device further includes a fixed bar 81 disposed on the mounting plate 11, a movable bar 82 cooperating with the fixed bar 81 to clamp the pin 5, a first driving rod 83 and a second driving rod 84 for driving the movable bar 82 to move away from or close to the fixed bar 81, and a connecting rod 85 connecting the first driving rod 83 and the second driving rod 84; the first driving rod 83 and the second driving rod 84 are rotatably disposed on the mounting plate 11, and the second driving rod 84 is rotatably connected to the other end of the driving cylinder 42. Two pins 5 for fixing the PCB are arranged, and one pin 5 is fixed through the inclined wedge block 3 and the clamping groove 2; another pin 5 is fixed through fixed strip 81 and activity strip 82, can fix two pins 5 through a drive actuating cylinder promptly, effectual improvement work efficiency, reduction in production cost.

Table 1 pin clamping device compares existing pneumatic clamping device

As can be seen from table 1:

(1) after the experimental conditions are strictly controlled, the improved pin clamping device has better zero return performance than an original gas clamp in a force contrast test experiment, the improved pin clamping device is about 10 microns, and the original gas clamp is about 18-20 microns.

(2) After the improved pin clamping device is loaded with forward and backward inertia forces, the rotation quantity of the dial indicator and the return zero value are in a uniform and symmetrical distribution state, so that the processing error is homogenized, and the processing precision is improved. Therefore, the pin clamping device has essential improvement on the control of the pin posture, and the practical effect of the invention is verified.

It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.

Claims

1. A pin clamping device is used for clamping a pin to be in a vertical posture so as to position a PCB and is characterized by comprising a clamping seat assembly provided with a clamping groove and an inclined wedge block which is arranged on the clamping groove in a sliding mode and provided with a clamping surface, wherein a limiting part capable of abutting against the side face of the pin is arranged at the clamping end of the clamping groove, the inclined wedge block is pressed to the clamping end under the action of external force, and the clamping surface is pressed to the limiting part of the pin so as to clamp the pin, the sliding direction of the inclined wedge block is perpendicular to the moving direction of the PCB, the clamping surface and the moving direction of the inclined wedge block are arranged at β degrees, and the angle of 30 degrees to β degrees is smaller than or equal to 60 degrees.

2. The pin clamping device of claim 1, wherein: the pin clamping device further comprises a power assembly used for driving the wedge block to slide on the clamping groove, the wedge block is pressed to the clamping end under the driving of the power assembly, and the clamping surface is pressed towards the pin to the limiting portion so as to clamp the pin.

3. A pin holding arrangement as claimed in claim 1, in which the holding surface is a convexly curved surface in the middle.

4. A pin holding device as claimed in claim 3, wherein one end of the wedge is further provided with a notch for receiving dust and machining debris, the notch being provided on the underside of the holding surface.

5. The pin clamp of claim 1, wherein the β is 45 °.

6. A pin holding arrangement as claimed in claim 1, in which the limit stop is a right angle end face.

7. The pin clamping device according to claim 2, wherein the power assembly comprises a wedge fork rotatably arranged on the clamping seat assembly and used for driving the wedge block to move, and a driving air cylinder rotatably connected with one end of the wedge fork, wherein the other end of the wedge fork is movably connected with the wedge block through a limiting shaft and a waist-shaped hole, one of the waist-shaped hole and the limiting shaft is arranged on the wedge fork, the other is arranged on the wedge block, and when the limiting part is matched with the wedge block to clamp the pin, a normal line of the circular arc contact between the inner wall of the waist-shaped hole and the limiting shaft is arranged at α degrees with the moving direction of the wedge block, wherein 0 degree is less than α and less than 15 degrees.

8. The pin clamping device of claim 7, wherein the clamping base assembly includes a mounting plate, a guide cover plate disposed on the mounting plate, and a securing block disposed at one end of the guide cover plate; the clamping groove comprises a guide groove and a limiting groove arranged at one end of the guide groove; the limiting groove is formed in the fixing block, the guide groove is formed in the guide cover plate, and the limiting portion is arranged on the limiting groove.

9. The pin clamp of claim 7, wherein the α is 10 °.

10. A pin holding arrangement as claimed in claim 8, further comprising a spring for providing a clamping force, the spring being secured at one end to the mounting plate and at the other end to the wedge yoke.

11. The pin clamping device according to claim 10, further comprising a fixed bar disposed on the mounting plate, a movable bar cooperating with the fixed bar to clamp the pin, a first driving bar and a second driving bar for driving the movable bar away from or toward the fixed bar, and a connecting rod connecting the first driving bar and the second driving bar; the first driving rod and the second driving rod are rotatably arranged on the mounting plate, and the second driving rod is rotatably connected with the other end of the driving cylinder.