CN110450077A - A centering clamping device - Google Patents

Abstract

The invention relates to the technical field of clamping tooling, and specifically discloses a centering clamping device. The centering clamping device includes a bracket; two clamping arms each include a horizontal bar and a vertical bar connected in an L shape, and the two horizontal bars are respectively connected to the bracket through an elastic member; two pressure-bearing parts, Each of the crossbars is connected with one of the pressure-bearing parts, and the two pressure-bearing parts are located on the same side of the crossbar; the eccentric wheel is rotatably arranged on the bracket, and the eccentric wheel The peripheral surface abuts against the two pressure-bearing parts, and the rotation of the eccentric wheel can press down the two pressure-bearing parts, so as to compress the elastic part, and make the two vertical bars close to each other to clamp the workpiece. The centering clamping device realizes the centering of the workpiece during the process of clamping the workpiece, and adjusts the distance between the two clamping arms according to the size of the workpiece to ensure that the clamping force of the workpieces of different sizes is consistent, so that the centering clamping device can Clamp the workpiece stably.

Description

A centering clamping device

technical field

The invention relates to the technical field of clamping fixtures, in particular to a centering clamping device.

Background technique

Clamping devices are essential to ensure the stability of components during machining. The existing clamping device includes two clamping arms and a cylinder, and the cylinder drives one of the clamping arms to move closer to or away from the other clamping arm, thereby clamping or releasing the workpiece.

The defect of the existing clamping device is that the centering of the workpiece cannot be achieved only by the movement of one clamping arm, and the distance between the two clamping arms cannot be adjusted according to the change of the workpiece size when clamping the workpiece, resulting in excessive clamping force or excessive clamping force. Small, can not guarantee the stability of the clamped workpiece, and even lead to deformation of the workpiece, thus affecting the stability and repeatability of the production and inspection process, which is not conducive to the quality control of the product.

Contents of the invention

The purpose of the present invention is to provide a centering clamping device to realize the centering of the workpiece during the process of clamping the workpiece, and adjust the distance between the two clamping arms according to the size of the workpiece to ensure the clamping of workpieces of different sizes The force is consistent, so that the centering clamping device can clamp the workpiece stably.

For reaching this purpose, the present invention adopts following technical scheme:

A centering clamping device comprising:

bracket;

The two clamping arms each include a horizontal bar and a vertical bar connected in an L shape, and the two horizontal bars are respectively connected to the bracket through an elastic member;

Two pressure-bearing parts, one pressure-bearing part is connected to each of the cross bars, and the two pressure-bearing parts are located on the same side of the cross bar;

The eccentric wheel is rotatably arranged on the bracket, the peripheral surface of the eccentric wheel abuts against the two pressure bearing parts, and the rotation of the eccentric wheel can press down the two pressure bearing parts, so that the Compression of the elastic member causes the two vertical bars to approach each other to clamp the workpiece.

Preferably, the centering clamping device further includes a housing, at least part of the cross bars are located in the housing, each of the cross bars is connected to a support shaft, and the support shaft is located in the elastic member Between and the vertical bar, the support shaft is rotatably connected to the side wall of the housing.

Preferably, a pressing block for abutting against the workpiece is detachably connected to the upper end of the vertical rod.

Preferably, the centerline of the pressure-bearing member intersects with the centerline of the elastic member and is perpendicular to each other.

Preferably, the centering clamping device further includes a rotating shaft rotatably connected to the bracket, and the eccentric wheel is sleeved on the outside of the rotating shaft.

Preferably, an indicator is connected to the rotating shaft, and the indicator can indicate the degree of rotation of the eccentric wheel.

Preferably, the indicator is a cylindrical structure, and the axis of the indicator is perpendicular to the axial direction of the rotating shaft.

Preferably, the cross section of the eccentric wheel is circular or elliptical.

Preferably, the elastic member is connected to an end of the horizontal bar away from the vertical bar.

Preferably, the bracket includes a connected base and a column, the column is provided with a through hole, and the rotating shaft is rotatably passed through the through hole.

Beneficial effects of the present invention: when the workpiece needs to be clamped, the workpiece is placed between the two vertical rods, and the eccentric wheel is rotated. During the rotation of the eccentric wheel, the contact point of the eccentric wheel with the pressure bearing and the rotation of the eccentric wheel The distance between the centers gradually increases, so that the eccentric gradually presses down on the pressure part. Since the lower side of the cross bar is connected to the bracket through the elastic part, after the pressure bearing part is under pressure, the pressure is transmitted to the elastic part through the cross bar, the elastic part is compressed, and the position where the cross bar is connected to the elastic part moves downward, and the two The vertical bars are tilted and approach each other so that the workpiece can be clamped. When the force between the two vertical rods and the workpiece, the pressure on the elastic member, and the friction between the eccentric wheel and the pressure member reach a balance, the eccentric wheel will not be able to rotate and the workpiece will be clamped. The centering clamping device can judge whether the workpiece is clamped by judging whether the eccentric wheel can continue to rotate. Therefore, workpieces of different sizes are clamped with the same clamping force. Because the eccentric wheel presses against the two pressure-bearing parts at the same time, the inclination of the two vertical rods is the same during the clamping process. Therefore, the two clamping arms can also center the workpiece and improve the detection and effect accuracy of the workpiece.

Description of drawings

Fig. 1 is a schematic structural view of a centering clamping device provided by an embodiment of the present invention;

Fig. 2 is a schematic structural view of the centering clamping device provided by the embodiment of the present invention after the housing is removed;

Fig. 3 is a cross-sectional view of the centering clamping device provided by the embodiment of the present invention;

Fig. 4 is a cross-sectional view of another position of the centering clamping device provided by the embodiment of the present invention.

In the picture:

1. Bracket; 11. Base; 12. Column;

2. Clamping arm; 21. Cross bar; 22. Vertical bar; 23. Briquetting block;

3. Pressure-bearing part; 4. Eccentric wheel; 5. Elastic part; 6. Shell; 7. Support shaft; 8. Rotating shaft; 9. Indicator part; 10. Handle.

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only the parts related to the present invention are shown in the drawings but not all of them.

As shown in Figures 1 and 2, this embodiment provides a centering clamping device for clamping a workpiece to be processed or detected, so as to realize the centering of the workpiece during the clamping process, and according to The size of the workpiece adjusts the distance between the two clamping arms to ensure the same clamping force for workpieces of different sizes, so that the centering clamping device can clamp the workpiece stably. The centering and clamping device provided in this embodiment includes a housing 6 , a bracket 1 , two clamping arms 2 , two pressure bearing parts 3 and an eccentric wheel 4 . Wherein, the two pressure bearing parts 3 , the elastic part 5 , the eccentric wheel 4 and part of the clamping arm 2 are all located in the housing 6 . The housing 6 is provided with a through hole, so that another part of the clamping arm 2 can protrude out of the housing 6 to clamp the workpiece.

As shown in FIG. 2 and FIG. 3 , the two clamping arms 2 each include a horizontal bar 21 and a vertical bar 22 connected in an L shape, and the two vertical bars 22 are respectively located at ends of the two horizontal bars 21 away from each other. The two cross bars 21 are respectively connected to the bracket 1 through an elastic member 5 . Each crossbar 21 is connected with a pressure bearing part 3 , and the two pressure bearing parts 3 are located on the same side of the crossbar 21 . The eccentric wheel 4 is rotatably arranged on the bracket 1 to rotate around its center of rotation. The peripheral surface of the eccentric wheel 4 abuts against the surfaces of the two pressure-bearing parts 3, and the rotation of the eccentric wheel 4 can press down the two pressure-bearing parts 3, so that the elastic part 5 is compressed, and the two vertical bars 22 are inclined towards each other and close to the clip. Tighten the workpiece. Specifically, the angle between the cross bar 21 and the vertical bar 22 can be 90°, and it can also be an acute angle or an obtuse angle. As long as the end of the horizontal bar 21 away from the vertical bar 22 is pressed down, the two vertical bars 22 can be tilted and approach each other. That's it.

When the workpiece needs to be clamped, the workpiece is placed between the two vertical rods 22, and the eccentric wheel 4 is rotated. The distance from the center of rotation gradually increases, so the eccentric wheel 4 will gradually press down on the pressure bearing member 3 . Since the lower side of the cross bar 21 is connected to the bracket 1 through the elastic member 5, after the pressure bearing member 3 is subjected to pressure, the pressure is transmitted to the elastic member 5 through the cross bar 21, and the elastic member 5 is compressed, and the cross bar 21 and the elastic member 5 The connected position is moved downwards and the two vertical bars 22 are tilted towards each other so that the workpiece can be clamped. After the force between the two vertical rods 22 and the workpiece, the pressure on the elastic member 5, and the friction between the eccentric wheel 4 and the pressure member 3 reach a balance, the eccentric wheel 4 will not be able to rotate, and the workpiece is now Clamp. The clamping force of the centering clamping device can adjust the pressure angle of the eccentric wheel 4 according to specific requirements, so as to achieve different clamping forces.

The centering clamping device in this embodiment can judge whether the workpiece is clamped by judging whether the eccentric wheel 4 can continue to rotate. Therefore, the clamping force received by workpieces of different sizes is consistent when they are clamped, which solves the problem of The size of the workpiece is different, resulting in too large or too small clamping force on the workpiece, resulting in deformation of the workpiece or unstable clamping. Since the eccentric wheel 4 is pressed against the two pressure-bearing parts 3 at the same time, the inclination of the two vertical rods 22 is the same during the clamping process. Therefore, the two clamping arms 2 can also automatically center the workpiece to a certain extent. It can play the function of rough guide and improve the detection and machining accuracy of the workpiece. Due to the action of the elastic member 5, the two clamping arms 2 are in the normally open state. Compared with the traditional clamping device, the steps of opening are reduced, the time is saved, and the working efficiency is improved.

The bracket 1 includes a connected base 11 and a column 12, and the column 12 is provided with a through hole. The centering and clamping device also includes a rotating shaft 8 rotatably connected to the column 12 , the rotating shaft 8 passes through the through hole of the column 12 and can rotate relative to the through hole. The eccentric wheel 4 is sheathed outside the rotating shaft 8 so that the eccentric wheel 4 can rotate relative to the bracket 1 . Further, in order to facilitate the rotation of the rotating shaft 8 , a handle 10 is provided at the end of the rotating shaft 8 .

Since the eccentric wheel 4 is arranged in the housing 6 , the operator cannot observe the degree of rotation of the eccentric wheel 4 , so an indicator 9 is connected to the rotating shaft 8 , and the indicator 9 can indicate the degree of rotation of the eccentric wheel 4 . Specifically, the indicator 9 is a cylindrical structure, and the axis of the indicator 9 is perpendicular to the axial direction of the rotating shaft 8 . Exemplarily, when the indicator 9 points upward and is in a vertical state, the point on the eccentric wheel 4 in contact with the pressure-bearing member 3 is the point closest to the center of rotation, where the force of the eccentric wheel 4 and the pressure-bearing member 3 Minimal or no force; when the indicator 9 points downward and is in a vertical state, the point on the eccentric wheel 4 in contact with the pressure-bearing member 3 is the point farthest from the center of rotation, where the eccentric wheel 4 and the pressure-bearing member 3 the maximum force.

Since the force driving the vertical bar 22 to rotate comes from the eccentric wheel 4, the main reason for determining the degree of inclination of the vertical bar 22 is the difference between the maximum distance and the minimum distance between the circumference of the eccentric wheel 4 and the center of rotation. The eccentric wheel 4 is used to clamp workpieces of different sizes, which improves the applicability of the centering clamping device.

As shown in Figure 3, the centerline of the pressure-bearing member 3 and the centerline of the elastic member 5 intersect and are perpendicular to each other, therefore, when the pressure-bearing member 3 is under the same force, the elastic member 5 can have the largest deformation, and then The degree of inclination of the vertical bar 22 is maximized. The pressure-bearing member 3 is preferably a cylindrical structure. The elastic member 5 is preferably a spring, of course, the elastic member 5 may also be a rubber post, a shrapnel or the like.

Further, in order to make the vertical bar 22 incline at a maximum angle under the same compression amount of the elastic member 5 , the elastic member 5 is connected to the end of the horizontal bar 21 away from the vertical bar 22 .

As shown in FIGS. 1 and 3 , in order to improve the rotation stability of the vertical bar 22 , in this embodiment, a support shaft 7 is provided on the clamping arm 2 . Specifically, at least part of the crossbar 21 is located in the housing 6, and each crossbar 21 is connected with a support shaft 7, the support shaft 7 is rotatably connected to the side wall of the housing 6, and the support shaft 7 is located between the elastic member 5 and the vertical between the rods 22, so that the clamping arm 2 is rotated around the support shaft 7 relative to the housing 6 by using the principle of leverage, so as to improve the stability of the rotation of the vertical rod 22.

The upper end of the vertical bar 22 is detachably connected with a pressure block 23, so that the pressure block 23 of different shapes can be replaced to adapt to workpieces of different shapes, thereby improving the clamping stability and the applicability of the device.

As shown in Figure 4, specifically, in order to make the eccentric wheel 4 gradually press down on the pressure member 3 during the rotation, the cross section of the eccentric wheel 4 is circular or elliptical, when the cross section of the eccentric wheel 4 is circular, The center of the circle and the center of rotation of the eccentric wheel 4 are spaced apart; when the cross section of the eccentric wheel 4 is elliptical, the center of the ellipse coincides with the center of rotation of the eccentric wheel 4 .

The working process of the centering clamping device provided in this embodiment is as follows:

1. Place the workpiece, turn the handle 10 in one direction (such as clockwise), when the pressure block 23 contacts the workpiece, slowly turn the handle 10, so that the eccentric wheel 4 is completely fixed and no longer rotates, indicating that the workpiece is clamped at this time tight.

2. Carry out follow-up testing or processing work.

3. After the detection or processing work is completed, turn the handle 10 slightly in the opposite direction (counterclockwise direction). When the friction force between the eccentric wheel 4 and the pressure-bearing part 3 is smaller than the elastic force of the elastic part 5, the two clamping arms 2 will automatically Open. Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. A centering clamping device, characterized in that, comprising: bracket (1); The two clamping arms (2) each include a cross bar (21) and a vertical bar (22) connected in an L shape, and the two cross bars (21) are respectively connected to the bracket through an elastic member (5) (1); Two pressure bearing parts (3), one pressure bearing part (3) is connected to each said cross bar (21), and two said pressure bearing parts (3) are located on said cross bar (21) ) on the same side; The eccentric wheel (4) is rotatably installed on the bracket (1), the peripheral surface of the eccentric wheel (4) abuts against the two pressure bearing parts (3), and the eccentric wheel (4) rotates The two pressure-bearing parts (3) can be pressed down to compress the elastic part (5) and make the two vertical bars (22) close to each other to clamp the workpiece. 2. The centering and clamping device according to claim 1, characterized in that, the centering and clamping device further comprises a housing (6), at least part of the crossbar (21) is located in the housing (6). ), each of the cross bars (21) is connected with a support shaft (7), and the support shaft (7) is located between the elastic member (5) and the vertical bar (22), so The support shaft (7) is rotatably connected to the side wall of the housing (6). 3. The centering and clamping device according to claim 1, characterized in that, the upper end of the vertical rod (22) is detachably connected with a pressing block (23) for abutting against the workpiece. 4. The centering and clamping device according to claim 1, characterized in that, the centerline of the pressure-bearing member (3) and the centerline of the elastic member (5) intersect and are perpendicular to each other. 5. The centering clamping device according to claim 1, characterized in that, the centering clamping device further comprises a rotating shaft (8) rotatably connected to the bracket (1), and the eccentric wheel (4) It is sleeved on the outside of the rotating shaft (8). 6. The centering and clamping device according to claim 5, characterized in that an indicator (9) is connected to the rotating shaft (8), and the indicator (9) can indicate that the eccentric wheel (4) degree of rotation. 7. The centering clamping device according to claim 6, characterized in that, the indicator (9) is a cylindrical structure, and the axis of the indicator (9) and the axis of the rotating shaft (8) vertically. 8. The centering and clamping device according to claim 1, characterized in that, the cross section of the eccentric wheel (4) is circular or elliptical. 9. The centering and clamping device according to claim 1, characterized in that, the elastic member (5) is connected to an end of the horizontal bar (21) away from the vertical bar (22). 10. The centering and clamping device according to claim 5, characterized in that, the bracket (1) comprises a connected base (11) and a column (12), and the column (12) is provided with a through hole , the rotating shaft (8) is rotatably passed through the through hole.