JP2009006404A - Clamping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a movable clamping part from hindering the installation of a workpiece in an unclamping state, and to stably support a cylinder for imparting clamping force to the movable clamping part on a clamp base. <P>SOLUTION: In this clamping device, the cylinder 4 is fixed to the clamp base 3, and a distal end part of a piston rod 4a of the cylinder 4 and a base end part of a clamp arm 5 formed with the movable clamping part 5a at a distal end part are connected via a link 7. The clamping device is provided with a first guide surface 10a for guiding oscillation of the clamp arm 5 according to advancing and retreating movement of the piston rod 4a, and guide roller 11 and second guide surface 10b for guiding movement of the clamp arm 5 in a direction orthogonal to advancing and retreating directions of the piston rod 4a. By movement of the clamp arm 5 in the direction orthogonal to the advancing and retreating directions of the piston rod 4a, the movable clamping part 5a is drawn in to a fixed clamping part 12a side to position and fix the workpiece 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention belongs to the technical field of a clamping device for positioning and fixing a workpiece.

In general, various clamping devices are used to position and fix a workpiece in various assembling processes, machining processes, and the like. Conventionally, as such a clamping device, an upper clamp jaw having a clamp portion at the tip is conventionally used. Is connected to the tip of the piston rod of a cylinder pivotally supported by the clamp base, while the intermediate portion of the upper clamp jaw is connected to the other end of the rotating member whose one end is connected to the clamp base. Further, a technique is known in which the workpiece can be installed without being obstructed by the upper clamp jaw by retreating the upper clamp jaw to a position below the workpiece during unclamping (for example, , See Patent Document 1).
Utility Model Registration No. 2522304

  By the way, when assembling or processing a frame that is a framework of a construction machine such as a hydraulic excavator, for example, the work is heavy, and a clamping device that positions and fixes the work requires a large clamping force. However, in the conventional apparatus, the clamping force is applied by the extension force of the cylinder. Since the cylinder is pivotally supported by the clamp base, the reaction force of the extension force of the cylinder is applied to the cylinder shaft. Since it acts on the support part, the cylinder shaft support part is subject to a large load and is easily fatigued. For this reason, there is a problem that it is not suitable for clamping a heavy work, and the present invention solves this problem. There is a challenge to try.

  The present invention has been created in view of the above circumstances and has been created for the purpose of solving these problems. The invention of claim 1 is a clamping device for positioning and fixing a workpiece, the clamping device comprising: , A fixed clamp portion fixed to the clamp base, a cylinder fixed to the clamp base, a movable clamp portion at the tip, and an intermediate portion swingable to the clamp base via a support shaft and in the arm length direction A clamp arm that is movably supported, a link having one end side swingably connected to the tip end portion of the piston rod of the cylinder, and a other end side swingably connected to the base end portion of the clamp arm, and a piston rod A first guide member that guides swinging about the support shaft of the clamp arm accompanying the forward / backward movement of the piston arm, and a piston arm of the clamp arm accompanying the forward / backward movement of the piston rod A second guide member for guiding movement in a direction perpendicular to the rod advance / retreat direction, and the movable clamp portion is pulled toward the fixed clamp portion by movement in the direction perpendicular to the piston rod advance / retreat direction of the clamp arm. A clamp device characterized in that the workpiece is positioned and fixed between the movable clamp portion and the fixed clamp portion.

  According to the first aspect of the present invention, the clamp arm swings around the support shaft as the piston rod advances and retreats, so that the movable clamp portion is positioned at a position that does not interfere with the workpiece installation during unclamping. In addition, the clamp arm moves in a direction perpendicular to the piston rod advance / retreat direction, so that the movable clamp part is pulled into the fixed clamp part side, and the workpiece is securely placed between the movable clamp part and the fixed clamp part. The positioning can be fixed. In addition, since the cylinder that applies the clamping force to the movable clamp portion is configured to be fixed to the clamp base, even if the workpiece is heavy and a large clamping force is required, the large clamping force is applied. The cylinder to be applied can be stably supported by the clamp base, and therefore, an optimum clamping device can be provided when a frame that is a framework of a construction machine such as a hydraulic excavator is assembled or processed.

  Next, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a clamping device. In the present embodiment, the clamping device 1 is configured to attach a work 2 such as a channel plate that forms the side surface of a swing frame in an assembly process of a swing frame of a hydraulic excavator (not shown). Used for positioning and fixing.

  Reference numeral 3 denotes a clamp base that constitutes a base of the clamp device 1, and a cylinder 4 is fixed to the lower portion of the clamp base 3. The cylinder 4 is advanced and retracted with the piston rod 4a moving up and down. It is assembled to move.

  On the other hand, reference numeral 5 denotes a clamp arm. The clamp arm 5 has a movable clamp portion 5a formed at the tip portion, and a long hole 5b that is long in the arm length direction is formed in the intermediate portion. A support shaft 6 fixed to the clamp base 3 is inserted into the long hole 5b, and the intermediate portion of the clamp arm 5 is connected to the support shaft 6 via the support shaft 6. The shaft is supported by the clamp base 3 so as to be rotatable as a shaft and movable in the length direction of the clamp arm 5.

  Further, a link 7 is interposed between the clamp arm 5 and the piston rod 4 a of the cylinder 4. One end of the link 7 is swingably connected to the distal end of the piston rod 4 a via a first pin shaft 8, and the other end is rocked to the proximal end of the clamp arm 5 via a second pin shaft 9. It is connected freely. The clamp base 3 is provided with a long hole 3a that is directed in the forward / backward direction of the piston rod 4a, that is, in the vertical direction. The long hole 3a is a roller that is rotatably supported by the first pin shaft 8. 8a is fitted so as to be movable up and down. The roller 8a moves up and down as the piston rod 4a moves forward and backward while being guided by the long hole 3a.

  Here, the positional relationship between the support shaft 6, the first pin shaft 8, and the second pin shaft 9 will be described. With respect to a straight line L connecting the axis of the first pin shaft 8 and the axis of the support shaft 6, The axis of the second pin shaft 9 is configured to be positioned on the opposite side of the fixed clamp portion 12a described later. In the present embodiment, the axis of the support shaft 6 is designed so as to be positioned on the extension line of the piston rod 4a in the forward / backward direction, and thus the axis of the support shaft 6 and the first pin A straight line L connecting the axis of the shaft 8 coincides with an extension line in the forward / backward direction of the piston rod 4a.

  Reference numeral 10 denotes a guide body that is assembled to the clamp base 3. The guide body 10 is formed with a first guide surface 10a and a second guide surface 10b. The first guide member of the present invention is in contact with the proximal end of the clamp arm 5 when the clamp arm 5 swings about the support shaft 6 as the piston rod 4a moves forward and backward as will be described later. Is set to guide the swing of the clamp arm 5. On the other hand, the second guide surface 10b (which constitutes a second guide member of the present invention together with a guide roller 11 described later) is configured so that the clamp arm 5 moves in the horizontal direction (piston rod 4a as the piston rod 4a moves forward and backward as described later. Is set so as to guide the horizontal movement of the clamp arm 5 by contacting the lower edge of the base end of the clamp arm 5.

  Furthermore, 11 is a rotatable guide roller (which constitutes the second guide member of the present invention together with the above-described second guide surface 10b of the guide body 10) assembled to the clamp base 3. The guide roller 11 As will be described later, when the clamp arm 5 moves in the horizontal direction (direction perpendicular to the advance / retreat direction of the piston rod 4a) as the piston rod 4a moves forward / backward, it abuts on the upper edge of the clamp arm 5 Thus, the horizontal movement of the clamp arm 5 is guided.

On the other hand, 12 is a fixed clamp member fixed to the clamp base 3 with bolts 13, and the distal end portion of the fixed clamp member 12 projects outward from the clamp base 3, and the projected distal end portion is the workpiece. 2 is a fixed clamp portion 12 a that abuts against 2. The bolt insertion hole 12b opened in the fixed clamp member 12 is formed as a long hole so that the position of the fixed clamp portion 12a can be adjusted.
In the present embodiment, the fixed clamp member 12 is directly fixed to the clamp base 3 with the bolt 13 as described above, but the present invention is not limited to this, and the clamp base and the fixed clamp are connected via other members. The member may be in a fixed state (for example, the clamp base 3 and the fixed clamp member 12 are both fixed to a mount on which the workpiece 2 is installed).

  The clamp device 1 positions and fixes the workpiece 2 between the movable clamp portion 5a and the fixed clamp portion 12a based on the operation of the crank arm 5 accompanying the forward / backward movement of the piston rod 4a of the cylinder 4. However, the operation of the crank arm 5 will be described below with reference to FIGS.

  First, FIG. 1 shows the clamping device 1 in an unclamped state. In this state, the piston rod 4a of the cylinder 4 is located at the lowest position, and the axis of the second pin shaft 9 is the first pin. The clamp arm 5 is fixed to the straight line L connecting the shaft core of the shaft 8 and the shaft core of the support shaft 6 at a position slightly deviated on the opposite side of the fixed clamp portion 12a. It faces upward with a slight inclination toward the clamp portion 12a. Further, the support shaft 6 is located at the lower end of the long hole 5 b of the clamp arm 5. In this state, the clamp arm 5 is not positioned above the workpiece 2, and thus can be arranged so as to contact the fixed clamp portion 12 a without being obstructed by the clamp arm 5. .

  Next, when the piston rod 4a is moved upward (advanced) from the unclamped state, the crank arm 5 swings in the direction of arrow A about the support shaft 6 as the piston rod 4a moves upward as shown in FIG. Thus, the movable clamp portion 5a is positioned above the workpiece 2. The swing of the clamp arm 5 is guided by the proximal end of the clamp arm 5 coming into contact with the guide surface 10 a of the first guide member 10.

  When the piston rod 4a is further moved upward from the state of FIG. 2, the crank arm 5 is in a state of being directed in the horizontal direction (a direction perpendicular to the advancing / retreating direction of the piston rod 4a) as shown in FIG. In this state, the guide roller 11 is in contact with the base end upper edge of the clamp arm 5, and further swinging about the support shaft 6 of the crank arm 5 is restricted, and the movable clamp portion 5 a It faces the fixed clamp portion 12a with the workpiece 2 interposed therebetween.

When the piston rod 4a is further moved upward from the state shown in FIG. 3, the clamp arm 5 moves the guide roller 11 in contact with the upper edge and the second guide of the guide body 10 in contact with the lower edge as shown in FIG. It is horizontally moved in the direction of arrow B while being guided by the surface 10b. As a result, the movable clamp portion 5a is pulled toward the fixed clamp portion 12a and comes into contact with the workpiece 2, and the workpiece 2 is clamped and fixed between the movable clamp portion 5a and the fixed clamp portion 12a. It is like that.
Here, as described above, the guide roller 11 and the second guide surface 10b of the guide body 10 come into contact with the upper edge and the lower edge of the clamp arm 5 when the clamp arm 5 moves horizontally, so that the clamp arm 5 The horizontal movement of 5 can be stabilized. Further, when an external force acting in the direction of swinging around the support shaft 6 (in the direction of arrow F1 in FIG. 4 or the direction of arrow F) is applied to the clamp arm 5 with the workpiece 2 positioned and fixed, the external force Can be received by the guide roller 11 and the second guide surface 10 b of the guide body 10.

  On the other hand, when releasing the positioning and fixing of the workpiece 2, when the piston rod 4a is moved downward (withdrawn) from the state of FIG. 4, the clamp arm 5 is different from the case where the piston rod 4a is moved upward. Moving in the reverse direction, the state of FIG. 3 and FIG. 2 is sequentially obtained, and the state of FIG. 1 is restored.

  In the present embodiment configured as described, the clamp device 1 includes a fixed clamp portion 12a fixed to the clamp base 3, a cylinder 4 fixed to the clamp base 3, and a movable clamp portion 5a at the tip portion. A clamp arm 5 whose middle portion is supported by the clamp base 3 so as to be swingable and movable in the arm length direction via a support shaft 6, and a first pin shaft 8 is attached to the tip of the piston rod 4 a of the cylinder 4 at one end side. A link 7 that is pivotably coupled via the second pin 9 to the base end of the clamp arm 5 and a clamp arm that accompanies the forward and backward movement of the piston rod 4a. The first guide surface 10a that guides the swing about the support shaft 6 of 5 and the direction orthogonal to the piston rod advance / retreat direction of the clamp arm 5 accompanying the advance / retreat movement of the piston rod 4a The guide roller 11 and the second guide surface 10b for guiding the movement of the clamp arm 5 and the movable clamp portion 5a to the fixed clamp portion 12a by the movement of the clamp arm 5 in the direction orthogonal to the piston rod advance and retreat direction. The workpiece 2 is positioned and fixed between the movable clamp part 5a and the fixed clamp part 12a by being drawn in.

  As a result, the movable clamp part 5a is displaced to a position that does not interfere with the installation of the work 2 and a position that faces the fixed clamp part 12a across the work 2 by swinging around the support shaft 6 of the clamp arm 5. The workpiece 2 can be arranged without being obstructed by the movable clamp portion 5a during unclamping, and the movable clamp portion 5a can be moved by moving the clamp arm 5 in the direction perpendicular to the piston rod advance / retreat direction. Thus, the workpiece 2 can be reliably positioned and fixed between the movable clamp portion 5a and the fixed clamp portion 12a. Moreover, since the cylinder 4 that applies the clamping force to the movable clamp portion 5a is configured to be fixed to the clamp base 3, even if the workpiece 2 is heavy and requires a large clamping force, The cylinder 4 that applies a large clamping force can be stably supported by the clamp base 3, and thus the optimum clamping device 1 is provided when assembling or processing a frame that is a framework of a construction machine such as a hydraulic excavator. can do.

It is a figure of the clamp apparatus of an unclamp state. It is a figure of a clamp device when a piston rod is moved up. It is a figure of a clamp device when a piston rod is further moved up. It is a figure of the clamp apparatus of a clamp state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Clamping device 2 Workpiece 3 Clamp base 4 Cylinder 4a Piston rod 5 Clamp arm 5a Movable clamp part 6 Support shaft 7 Link 10 Guide body 10a First guide surface 10b Second guide surface 11 Guide roller 12a Fixed clamp part

Claims (1)

A clamping device for positioning and fixing a workpiece,
The clamping device
A fixed clamp part fixed to the clamp base;
A cylinder fixed to the clamp base;
A clamp arm having a movable clamp portion at the tip, and an intermediate portion supported by the clamp base so as to be swingable and movable in the arm length direction via a support shaft;
A link whose one end side is swingably connected to the tip of the piston rod of the cylinder and whose other end is swingably connected to the base end of the clamp arm;
A first guide member that guides rocking about the support shaft of the clamp arm as the piston rod moves forward and backward;
A second guide member that guides the movement of the clamp arm in a direction perpendicular to the piston rod advance / retreat direction accompanying the advance / retreat movement of the piston rod;
The structure is such that the workpiece is positioned and fixed between the movable clamp portion and the fixed clamp portion by pulling the movable clamp portion toward the fixed clamp portion by moving the clamp arm in a direction perpendicular to the piston rod advance / retreat direction. A clamping device.

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