CN110405238A - A New Type of Fixture for Turning - Google Patents

Abstract

The invention discloses a novel clamp for turning processing, wherein: a moving connecting rod is coaxially fixedly connected and assembled with the output end of a hydraulic cylinder; a functional guide ring is fixedly connected on the peripheral surface of the moving connecting rod; The clamping action modules are flexibly connected; the three clamping action modules are arranged in a uniform circular array along the central axis of the moving link; the clamping action modules include a displacement block, a ball head shifting block and an actuator; the rotating main body is pinned inside the displacement block , can rotate freely; the end of the dial head away from the rotating body is clamped inside the actuator; the dial rod is fitted and connected with the functional guide ring; the displacement block slot is fitted and connected with the functional guide ring; There is a shell cone; the shell cone is located below the displacement block. Beneficial effects: reasonable structure, reliable operation; axial traction function; circumferential floating function; centrifugal force compensation function; segmented clamping function; modular design, effectively reducing the application cost.

Description

A New Type of Fixture for Turning

Technical field:

The invention relates to the mechanical field, in particular to a novel turning fixture.

Background technique

Fixture refers to the device used to fix the processing object in the process of mechanical manufacturing so that it can occupy the correct position to accept construction or inspection, also known as fixture. In a broad sense, any process in the process, the device used to install the workpiece quickly, conveniently and safely, can be called a fixture.

During the use of traditional turning fixtures, there are the following disadvantages: the clamping positioning is not accurate, resulting in a low concentration of turning workpiece size tolerance, or even being out of tolerance and scrapped; the jaws can only move radially along the track, which cannot be overcome. Positioning error caused by workpiece shape out-of-tolerance; unable to overcome the loss of clamping force caused by high-speed rotation of the chuck; unable to avoid equipment damage caused by the rigid transfer of the automatic connection manipulator; unable to achieve rapid replacement, affecting the improvement of production efficiency; not modular Design, replacement cost is high.

Contents of the invention

The purpose of the present invention is to provide a device with reasonable structure and reliable operation; it has the function of axial traction, which avoids the problem that the workpiece cannot be 100% guaranteed to be close to the positioning surface during batch processing; it has the function of floating in the circumferential direction, and avoids the excessive Bad clamping eccentricity caused scrapping or geometric accuracy out of tolerance; with centrifugal force compensation function, avoiding clamping failure caused by clamping force loss in turning processing; with segmented clamping function, avoiding automatic link manipulator Equipment damage caused by rigid transfer; modular design, with modular quick-change function, which avoids long time for model change and can effectively reduce the application cost of a new type of turning fixture.

The present invention is achieved through the following technical solutions:

The present invention is a novel fixture for turning processing, which includes a moving connecting rod, a housing, a functional guide ring, a displacement block, an actuator and a hydraulic cylinder, wherein: the moving connecting rod is coaxially fixedly connected and assembled with the output end of the hydraulic cylinder; the moving A functional guide ring is fixedly connected to the peripheral surface of the connecting rod; the functional guide ring is movably connected with the three clamping action modules; the three clamping action modules are arranged in a uniform circular array along the central axis of the moving link; the clamping action modules include Displacement block, ball head shift block and actuator; the ball head shift block includes a rotating body, a shifting head and a shifting rod; the shifting head and shifting rod are located on the rotating body in an "L" shape; the end of the shifting head is set in a spherical shape The rotating main body is pin-connected to the inside of the displacement block and can rotate freely; the end of the dial away from the rotating main body is clamped inside the actuator; the driving rod extends to the outside of the displacement block and is connected with the functional guide ring; on the displacement block There is a displacement block slot; the displacement block slot is assembled and connected with the functional guide ring; the movement connecting rod, the functional guide ring, the displacement block, and the hydraulic cylinder are located inside the shell; the shell is a straight cylindrical shell; the shell A shell cone is arranged on the inner peripheral surface of the shell; the shell cone is located below the displacement block.

The above-mentioned new type of fixture for turning processing, wherein: the functional guide ring includes a lever guide ring, a displacement block guide ring and a termination guide ring; the displacement rod guide ring, displacement block guide ring and termination guide ring are arranged sequentially from top to bottom , coaxially and fixedly connected to the peripheral surface of the moving link; the outer peripheral surface of the lever guide ring is provided with a circle of lever slots; the lever extends from the inside of the displacement block and is snapped into the slot of the lever; the displacement block The guide ring is clamped in the slot of the displacement block; the slot of the displacement block is located under the ball head shifting block; the termination guide ring is located directly above the hydraulic cylinder.

The above-mentioned novel turning fixture, wherein: the diameter of the lower end of the cone surface of the casing is smaller than the diameter of the upper end.

The above-mentioned new type of fixture for turning processing, wherein: the dial is clamped in the cavity inside the actuator; the internal cavity of the actuator is geometrically similar to the outer contour of the dial, and is larger than that of the dial. Outer contour; the rotating body, the shifting head and the shifting rod are clamped in the internal cavity of the displacement block; the shifting head extends from the rotating body to the outside of the displacement block and is connected with the actuator; the internal cavity of the displacement block is connected to the rotating body and The outer contours of the shifting head and the shifting rod in the displacement block are geometrically similar and larger than the outer contours.

The above-mentioned new type of fixture for turning, wherein: the outer contours of the dial and the dial of the ball head shifting block form a smooth arc surface through the rotating body.

The above-mentioned new type of fixture for turning processing, wherein: the actuator is a chuck-type jaw or an arc-shaped jaw or a chuck-type soft jaw.

The beneficial effects of the present invention are: reasonable structure, reliable operation; axial traction function, which avoids the problem that the workpiece cannot be 100% ensured to be close to the positioning surface during batch processing; and circumferential floating function, which avoids the over-tolerance of the ellipticity of the input part Scrapped or geometrically out-of-tolerance caused by clamping eccentricity; with centrifugal force compensation function, to avoid clamping failure caused by clamping force loss in turning; with segmented clamping function, to avoid the rigidity of automatic link manipulator Equipment damage caused by switching; modular design, with modular quick-change function, avoiding long time for model change and effectively reducing application costs.

Description of drawings

Fig. 1: structural schematic sectional view of the present invention;

Figure 2: a schematic diagram of the three-dimensional structure of the present invention;

In the figure: 1-moving connecting rod, 2-housing, 3-function guide ring, 4-displacement block, 5-ball shift block, 6-executing mechanism, 7-hydraulic cylinder.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

Embodiment: As shown in Figures 1 and 2, a new type of fixture for turning processing includes a moving link 1, a housing 2, a functional guide ring 3, a displacement block 4, an actuator 6 and a hydraulic cylinder 7, wherein: the moving link The rod 1 and the output end of the hydraulic cylinder 7 are coaxially fixedly connected and assembled; the peripheral surface of the moving connecting rod 1 is fixedly connected with a functional guide ring 3; the functional guide ring 3 is movably connected with three clamping action modules; The action modules are arranged in a uniform circular array along the central axis of the moving link 1; the clamping action module includes a displacement block 4, a ball head shift block 5 and an actuator 6; the ball head shift block 5 includes a rotating body, a shift head and a shift rod; The dial and the shift lever are located on the rotating body and are arranged in an "L" shape; the end of the dial is set in a spherical shape; the rotating body is pin-connected to the inside of the displacement block 4 and can rotate freely; the end of the dial away from the rotating body is clamped In the interior of the actuator 6; the lever extends to the outside of the displacement block 4, and is fitted and connected with the functional guide ring 3; the displacement block 4 is provided with a displacement block slot; the displacement block slot is fitted and connected with the function guide ring 3; The moving connecting rod 1, the functional guide ring 3, the displacement block 4, and the hydraulic cylinder 7 are located inside the housing 2; the housing 2 is a straight cylindrical housing; the inner peripheral surface of the housing 2 is provided with a housing cone ;The tapered surface of the housing is located below the displacement block 4; wherein: the functional guide ring 3 includes the lever guide ring, the displacement block guide ring and the termination guide ring; the displacement rod guide ring, the displacement block guide ring and the termination guide ring are from top to bottom Arranged in sequence, coaxially fixedly connected to the peripheral surface of the moving link 1; a circle of lever card slots is provided on the outer peripheral surface of the lever guide ring; the lever extends from the inside of the displacement block 4, and is clamped on the lever card In the groove; the guide ring of the displacement block is clamped in the slot of the displacement block; the slot of the displacement block is located below the ball head shifting block 5; the termination guide ring is located directly above the hydraulic cylinder 7; wherein: the diameter of the lower end of the cone surface of the shell is less than The diameter of the upper end; wherein: the dial is clamped in the cavity inside the actuator 6; the inner cavity of the actuator 6 is geometrically similar to the outer contour of the dial, and is larger than the outer contour of the dial; rotation The main body, the shifting head and the shifting rod are clamped in the inner cavity of the displacement block 4; the shifting head extends from the rotating body to the outside of the displacement block 4 and is connected to the actuator 6; the inner cavity of the displacement block 4 is connected to the rotating body and The outer contours of the part of the shifting head and the shifting rod in the displacement block 4 are geometrically similar and larger than the outer contours; wherein: the outer contours of the shifting head and the shifting block of the ball head shifting block 5 are smooth circles through the rotating body arc surface; wherein: the actuator 6 is a chuck-type claw or an arc-shaped claw or a chuck-type soft claw.

When working: first, under the action of the hydraulic cylinder 7, the moving link 1 moves down, and the lever guide ring of the functional guide ring 3 drives the actuator 6 to pre-clamp through the ball head shift block 5; the pre-clamping action is through The leverage action of the ball head block 5 is completed; the joint surface of the ball head block 5 and the actuator 6 has a 1-3° rotation angle reserved to adapt to the clamping error caused by the non-standard shape of the blank in the adaptive process; , after the range of movement of the lever and its contour is enlarged by the ball head shifting block 5, the range of movement of the driving head is driven, which is the displacement range of pre-clamping;

Then the moving connecting rod 1 continues to move down, and the displacement block guide ring of the functional guide ring 3 is linked with the displacement block slot to drive the displacement block 4 to move downward axially, and the actuator 6 is pulled axially by the ball head shift block 5 to shrink; the process is as follows: In the intermediate clamping process, the range of motion between the displacement block 4 and the conical surface of the shell is the displacement range of the intermediate clamping process;

Finally, the moving connecting rod 1 continues to move down, and the displacement block 4 generates radial and axial displacements at the same time through the action of the cone surface of the housing, which promotes the final clamping process of the actuator 6; the vector of the radial and axial displacements and , are the final clamping displacement range;

The above is the action process of segmented clamping. The functional guide ring 3 is connected with the three clamping action modules in the same way at the same time, so the three clamping action modules are synchronously linked to complete the clamping action of the parts to be processed.

The loosening process is opposite to the above-mentioned three-stage clamping process.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some of the technical features may be replaced equivalently, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.

Claims (6)

1. A new type of fixture for turning, comprising a moving link (1), a housing (2), a functional guide ring (3), a displacement block (4), an actuator (6) and a hydraulic cylinder (7), its It is characterized in that: the moving connecting rod (1) is coaxially fixedly connected and assembled with the output end of the hydraulic cylinder (7); the peripheral surface of the moving connecting rod (1) is fixedly connected with a functional guide ring (3); The functional guide ring (3) is flexibly connected with the three clamping action modules; the three clamping action modules are arranged in a uniform circular array along the central axis of the moving link (1); the clamping action modules include displacement blocks (4), ball shift block (5) and actuator (6); said ball shift block (5) includes a rotating body, a shifting head and a shifting lever; said shifting head and shifting rod are located on the rotating body, in "L" shape; the end of the dial is set in a spherical shape; the rotating body is pinned to the inside of the displacement block (4) and can rotate freely; the end of the dial away from the rotating body is clipped to the actuator (6) inside; the shifting rod extends to the outside of the displacement block (4), and is fitted and connected with the functional guide ring (3); the displacement block (4) is provided with a displacement block slot; the displacement block The card slot is assembled and connected with the functional guide ring (3); the moving link (1), functional guide ring (3), displacement block (4), and hydraulic cylinder (7) are located inside the housing (2); The housing (2) is a straight cylindrical housing; the housing (2) is provided with a housing cone surface on the inner peripheral surface; the housing cone surface is located below the displacement block (4). 2. A new type of turning fixture as claimed in claim 1, characterized in that: said function guide ring (3) includes a lever guide ring, a displacement block guide ring and a termination guide ring; said lever guide ring , the displacement block guide ring and the termination guide ring are arranged sequentially from top to bottom, and are coaxially fixedly connected to the peripheral surface of the moving connecting rod (1); the outer peripheral surface of the driving rod guide ring is provided with a circle of driving rod slots ; The shifting rod extends from the inside of the displacement block (4) and is clamped in the slot of the shifting rod; the guide ring of the displacement block is clamped in the slot of the displacement block; the slot of the displacement block is located in the ball head shifting block The bottom of (5); the termination guide ring is located directly above the hydraulic cylinder (7). 3. A novel turning fixture according to claim 1, characterized in that: the diameter of the lower end of the conical surface of the housing is smaller than the diameter of the upper end. 4. A new type of clamp for turning according to any one of claims 1-3, characterized in that: the dial is clamped in the cavity inside the actuator (6); the actuator (6) ) is geometrically similar to the outer contour of the dial, and is larger than the outer contour of the dial; the rotating body, the dial and the shift rod are clamped in the inner cavity of the displacement block (4) ; The shifting head extends from the rotating body to the outside of the displacement block (4), and is connected with the actuator (6); the inner cavity of the displacement block (4) is connected with the rotating body, the shifting head, and the shifting rod in the displacement block The outer contours of the parts in (4) are geometrically similar and larger than the outer contours. 5. A new type of turning fixture according to claim 4, characterized in that: the outer contour of the dial and the dial of the ball head shifting block (5) is a smooth arc surface through the rotating body. 6. A new type of turning fixture according to claim 4, characterized in that: the actuator (6) is a chuck-type jaw or an arc-shaped jaw or a chuck-type soft jaw.