KR20230058969A - Clamp system with compact working radius - Google Patents

Abstract

The present invention provides a clamp system with a compact operating radius for firmly restraining or releasing a workpiece during a machining process to prevent the workpiece from moving. The clamp system with a compact operating radius comprises: a cylinder (10) in which a piston rod (12) having a piston performs a linear reciprocating motion, and which has a pair of side plates (14) installed at a position corresponding to an operating section on the top of the piston rod (12); a clamp arm (20) which is pivotally connected around a rod pin (22) installed at the end of the piston rod (12), and has a jaw (24) provided on one side for clamping/unclamping a workpiece (W); a curved cam rail (30) which is formed on the side of the clamp arm (20) and is formed into an involute curve around the rod pin (22); and a camshaft (40) which is installed on the side plates (14), and is provided to pivot the clamp arm (20) by a cam motion in coordination with the curved cam rail (30). The clamp system with a compact operating radius improves the structure to allow the clamp arm to pivot around the rod pin through the cam motion of the cam rail and the camshaft, linked to the retraction and extension operations of the piston rod, such that the turning radius according to the clamping and unclamping operations of the clamp arm is reduced, thereby allowing for efficient operation in confined spaces without interference.

Description

Clamp system with compact working radius {Clamp system with compact working radius}

The present invention relates to a clamp system having a compact operating radius, and more specifically, to a clamp system having a compact operating radius that can be efficiently operated in a narrow space without interfering with surrounding objects or workers.

In general, in robot-based automated manufacturing lines, clamps for fixing workpieces are installed for each process, and the clamps are connected to a central server to automatically control clamping and unclamping operations.

In addition, as the operation timing of the clamp is precisely controlled in consideration of the cycle time for each process and a predetermined clamping force is required, the existing control method using a motor is being converted to a method using a pneumatic cylinder. However, in the case of a pneumatic cylinder, since the operating range is limited to linear reciprocating motion, clamping and unclamping operations are not effectively transmitted.

Accordingly, in Patent Registration No. 10-1550749 disclosed in the prior art, a body portion, a cylinder portion connected to the body portion, and having a piston and a piston rod that change position along the axial direction under the action of pressing pressure by a pressure fluid, An adjustment mechanism installed in the cylinder so that the position thereof can be freely changed and adjusting the amount of stroke displacement of the piston by regulating the position change of the piston; A detecting mechanism having a detecting unit capable of detecting a position, and detecting the clamping and clamping states of the workpiece by the clamp arm by detecting the position when the detecting body is stroked with the detecting unit; A technique having a position setting means for setting a detection position of the detection object by the detection unit when the amount of stroke displacement is adjusted has been previously proposed.

In addition, in another prior art, Patent Registration No. 10-0358924, a main body, a driving source integrally connected to the main body, a driving force transmission means for transmitting the driving force of the driving source, and converting the driving force transmitted from the driving force transmission means into a rotational motion of the arm. Toggle link mechanism, rotation amount setting means for setting the rotation amount of the arm, and rotation amount setting means are provided interchangeably in response to the rotation amount of the arm set by the rotation amount setting means, and one side in which the arm is in a non-clamped state A technique including a detection means for detecting the displacement terminal position and the other displacement terminal unit value in a state in which the arm is clamped has been previously registered.

However, the prior art attempts to clamp a workpiece using a clamp arm that rotates at a predetermined angle under the action of changing the position of a piston, but has a high failure rate due to a complicated power conversion structure that converts linear motion into rotational motion, and the rotation radius of the clamp arm This expansion causes interference in the work loading and unloading process, and in particular, since the piston stroke distance, that is, the cylinder size is increased in proportion to the swing operation range of the clamp arm, as a result, the volume of the clamp device increases.

KR 10-1550749 B1 (2015.09.01.) KR 10-0358924 B1 (2002.10.16.)

In the present invention, a new technology has been invented to solve all the problems of the prior art, and the clamp arm is pivoted around the rod pin by the cam movement of the cam rail and camshaft in connection with the retracting and withdrawing operation of the piston rod. An object of the present invention is to provide a clamp system with a compact operating radius in which the turning radius of the clamp arm according to clamping and unclamping operations is minimized by improving the structure.

In addition, although not separately described, other objects within the scope that can be inferred in view of the specific contents and claims for carrying out the invention below are also included in the overall task of the present invention.

As a specific means for solving the above problems of the present invention, in the present invention, a clamp system having a compact operating radius is configured, but the piston rod 12 in which the piston is installed is provided so as to linearly reciprocate, and the piston rod 12 A cylinder 10 in which a pair of side plates 14 are installed at a position corresponding to the upper operating section; A clamp arm 20 connected in a pivotal manner around the rod pin 22 installed at the end of the piston rod 12 and having a jaw 24 for clamping/unclamping the workpiece W on one side. ; a curved cam rail 30 formed on the side of the clamp arm 20 and formed in an involute curve around the load pin 22; and a camshaft 40 installed on the side plate 14 and provided to pivot the clamp arm 20 by a cam motion with the curved cam rail 30 .

At this time, one end is connected to the end of the curved cam rail 30, and the other end extends in a straight line parallel to the operating direction of the piston rod 12 at the angle at which the clamp arm 20 is clamped (32). ) is characterized in that it is provided.

In addition, when the clamp arm 20 is moved by the withdrawal operation of the piston rod 12, the distance between the rod pin 22 and the camshaft 40 is reduced, and the curved cam rail 30 moves the camshaft 40. The clamp arm 20 is pivotally operated in the unclamping direction by riding and tilting,

When the clamp arm 20 is linearly moved by the pulling operation of the piston rod 12, the distance between the rod pin 22 and the camshaft 40 is extended, and the curved cam rail 30 rides the camshaft 40. After the inclined movement of the clamp arm 20 is performed in the clamping direction, the camshaft 40 is engaged with the straight cam rail 32 to restrict the rotation of the clamp arm 20 in the unclamping direction. .

According to the specific means for solving the above problems, the present invention is linked to the retracting and withdrawing operation of the piston rod, and the clamp arm is structurally improved so that the clamp arm is pivoted around the rod pin by the cam movement of the cam rail and the cam shaft. Since the turning radius according to the clamping and unclamping operation of the is reduced to a compact size, it has the effect of being able to operate efficiently in a narrow space without interfering with objects or workers around the work space.

In addition, since a straight cam rail in a vertical direction is extended from the end of the curved cam rail, the clamping pressure can be appropriately adjusted according to the material even for workpieces made of highly compressible or soft materials.

1 is a perspective view showing a clamp system having a compact operating radius according to an embodiment of the present invention as a whole.
Figure 2 is a block diagram showing the internal structure of the clamp system having a compact operating radius according to an embodiment of the present invention.
Figure 3 is a block diagram showing the operating state of the clamp system having a compact operating radius according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail according to specific embodiments of the accompanying drawings. Technical terms used in this specification are terms selected in consideration of functions in embodiments, and the meanings of the terms may vary depending on specific embodiments of the invention. And throughout the specification, when a part is said to be "connected" to another part, this includes not only the case of being "directly connected" but also the case of being "indirectly connected" with another member interposed therebetween. do.

In addition, expressions indicating directions such as "up, down, front, back" used in the following description are defined based on the drawings, and the shape and position of each component are not limited by these terms.

1 is a perspective view showing a preferred embodiment of a clamp system having a compact operating radius provided by the present invention as a whole, and FIG. 2 is an internal structure of a clamp system having a compact operating radius according to an embodiment of the present invention. It is a schematic diagram showing

The present invention relates to a clamp system having a compact operating radius, which is linked to the retracting and withdrawing operation of the piston rod, and the structure is improved so that the clamp arm pivots around the rod pin by the cam movement of the cam rail and camshaft, It consists of a main component including a cylinder 10, a clamp arm 20, a curved cam rail 30, and a camshaft 40 so that the turning radius according to clamping and unclamping operations of the clamp arm can be minimized.

First, the cylinder 10 according to the present invention is provided so that the piston rod 12 in which the piston is installed is linearly reciprocated, and the piston is operated by pneumatic or hydraulic pressure to control the linear reciprocating motion of the piston rod 12. provided as possible

In addition, a pair of side plates 14 are disposed facing each other at a position corresponding to the operating section of the top of the piston rod 12 at the top of the cylinder 10 to support both ends of the camshaft 40 to be described later. are provided

The clamp arm 20 according to the present invention is connected to be able to pivot around the rod pin 22 installed at the end of the piston rod 12, and clamps (restrains) / unclamps the workpiece (W) on one side. A (release) jaw 24 is provided.

In the clamp arm 20, the position where the rod pin 22 is connected is the force point, the jaw 24 formed at one end becomes the acting point, and the curved cam rail 30 and the straight cam formed at the other end to be described later. The rail 32 becomes a variable fulcrum in a state supported by the camshaft 40 .

In this way, when the operating force of the piston rod 12 acts as a power point through the rod pin 22, the position of the fulcrum acting as the camshaft 40 is varied by the curved cam rail 30 and the straight cam rail 32. The clamp arm 20 is pivotally operated to clamp/unclamp the workpiece W.

The curved cam rail 30 according to the present invention is formed on the side of the clamp arm 20 and is formed in an involute curve around the rod pin 22.

Specifically, as shown in FIG. 2, the curved cam rail 30 is formed in an involute curve in which the distance from the rod pin 22 increases (extends) toward the opposite side of the jaw 24, and the camshaft 40 described later ) and cam movement.

In addition, one end is connected to the end of the curved cam rail 30, and the other end extends in a straight line parallel to the operating direction of the piston rod 12 at an angle at which the clamp arm 20 is clamped (32). ) is provided.

As the straight cam rail 32 is formed to be parallel to the operating direction of the piston rod 12 at the angle at which the clamp arm 20 is clamped, the piston rod in a state in which the clamp arm 20 clamps the workpiece W. In response to the additional pull-in operation force of (12), the clamping pressure can be adjusted while linear movement is allowed along with the piston rod 12 in a state where the swinging operation of the clamp arm 20 is stopped.

In this way, the straight cam rail 32 in the vertical direction is extended at the end of the curved cam rail 30 so that the length of the straight cam rail 32 is formed long when clamping a material with high compressibility or softness such as paper or rubber. By doing so, it can be provided to properly adjust the clamping force according to the material.

The camshaft 40 according to the present invention is installed on the side plate 14 and is provided to pivot the clamp arm 20 by cam movement with the curved cam rail 30 .

The camshafts 40 are provided as a pair to correspond to both sides of the clamp arm 20, or both ends when the curved cam rail 30 and the straight cam rail 32 are formed through the clamp arm 20. It may be provided with one sieve supported on the site plate 14.

3 is a block diagram showing the sequence of an unclamping operating state of a clamp system having a compact operating radius according to an embodiment of the present invention.

The camshaft 40 is fixed to the side plate 14, and the clamp arm 20 coupled with the piston rod 12 and the rod pin 22 according to the linear movement of the piston rod 12 is a curved cam rail ( 30) and the linear cam rail 32.

Looking at the operating state, when the clamp arm 20 is moved by the withdrawal operation of the piston rod 12, the distance between the rod pin 22 and the camshaft 40 as shown in FIGS. 3 (b) to 3 (c) As is reduced, the curved cam rail 30 tilts along the camshaft 40, and the clamp arm 20 pivots in the unclamping direction.

And, when the clamp arm 20 is linearly moved by the pulling operation of the piston rod 12, the distance between the rod pin 22 and the camshaft 40 is extended as shown in FIG. 3 (a), and the curved cam rail 30 ) is tilted along the camshaft 40 to rotate the clamp arm 20 in the clamping direction, and then the camshaft 40 engages with the straight cam rail 32 to perform the swinging operation of the clamp arm 20 in the unclamping direction. provided to limit

According to FIG. 3 , when the camshaft 40 is positioned within the section of the straight cam rail 32 , firm clamping is performed, and when the camshaft 40 is positioned within the section of the curved cam rail 30 , an unclamping state is achieved.

According to the clamp system of the present invention described above, the maximum turning radius of the clamp arm 20 is the sum of the length of the straight cam rail 32 and the turning radius of the jaw 24 formed in the curved cam rail 30 section. do.

As described above, as the clamp arm 20 is pivotally moved around the rod pin 22 by the retracting and withdrawing operation of the piston rod 12 and is provided to perform clamping and unclamping operations, the turning radius of the clamp arm 20 It is reduced to a compact size so that it can be operated efficiently in a narrow space without interfering with the surroundings, and in particular, the angle of the clamped state by the clamp arm 20 is firmly maintained by the camshaft 40 being engaged with the straight cam rail 32 There is an advantage to being

As described above, the most preferred embodiment of the present invention has been described in the detailed description of the present invention, but various modifications may be made within a range that does not depart from the technical scope of the present invention. Therefore, the scope of protection of the present invention should not be limited to the above embodiments, but the scope of protection should be recognized from the techniques of the claims to be described later and from these techniques to equivalent technical means.

10: Cylinder
12: piston rod 14: side plate
20: clamp arm
22: load pin 24: jaw
30: curved cam rail
32: straight cam rail
40: camshaft
W: Workpiece

Claims (3)

A cylinder 10 in which a piston rod 12 with a piston installed therein is provided so as to linearly reciprocate, and a pair of side plates 14 are installed at a position corresponding to an operating section at the top of the piston rod 12;
A clamp arm 20 connected in a pivotal manner around the rod pin 22 installed at the end of the piston rod 12 and having a jaw 24 for clamping/unclamping the workpiece W on one side. ;
a curved cam rail 30 formed on the side of the clamp arm 20 and formed in an involute curve around the load pin 22; and
A camshaft 40 installed on the side plate 14 and provided to pivot the clamp arm 20 by the curved cam rail 30 and the cam movement; having a compact operating radius, characterized in that it includes clamp system.
According to claim 1,
A straight cam rail 32 having one end connected to an end of the curved cam rail 30 and the other end extending in a straight line parallel to the working direction of the piston rod 12 at an angle at which the clamp arm 20 is clamped. A clamp system having a compact operating radius, characterized in that provided.
According to claim 2,
When the clamp arm 20 is moved by the withdrawal operation of the piston rod 12, the distance between the rod pin 22 and the camshaft 40 is reduced, and the curved cam rail 30 is inclined along the camshaft 40. The movement causes the clamp arm 20 to pivot in the unclamping direction,
When the clamp arm 20 is linearly moved by the pulling operation of the piston rod 12, the distance between the rod pin 22 and the camshaft 40 is extended, and the curved cam rail 30 rides the camshaft 40. After the clamp arm 20 is rotated in the clamping direction by tilting, the camshaft 40 is engaged with the straight cam rail 32 to limit the swing operation of the clamp arm 20 in the unclamping direction. Characterized in that Clamp system with a compact operating radius.

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