Gripper for gantry type three-point floating clamp

Abstract

The utility model discloses a gripper for a gantry type three-point floating clamp, which comprises a push-pull rod connected with a telescopic rod of a hydraulic cylinder, the lower end of the push-pull rod is rotatably connected with a three-point floating pressing plate, and a clamping nail is mounted at the bottom of the three-point floating pressing plate. The push-pull rod comprises a push-pull rod body, a connecting rod and a hemispherical connector which are coaxially arranged, a hemispherical inner cavity is formed in the upper surface of the three-point floating pressing plate, the hemispherical connector is installed in the hemispherical inner cavity, the push-pull rod is sleeved with a cylindrical silica gel sleeve, the bottom of the silica gel sleeve makes contact with the upper surface of the three-point floating pressing plate, and the bottom of the silica gel sleeve makes contact with the upper surface of the three-point floating pressing plate. A plurality of big-end-up liquid drainage through holes are formed in the three-point floating pressing plate, the top ends of the liquid drainage through holes penetrate through the bottom face of the hemispherical inner cavity, and the bottom ends of the liquid drainage through holes penetrate through the side wall of the three-point floating pressing plate. And the clamping quality is guaranteed, and the part machining yield is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of part processing, relates to a gripper of a fixture, and particularly relates to a gripper for a gantry-type three-point floating fixture. Background Art

[0002] The gantry-type three-point floating fixture is a commonly used clamping mechanism in parts such as transmission rocker arms and is often used for clamping on the rough surface of workpieces. In the use of the traditional gantry-type three-point floating fixture, a hemispherical connector is installed at the lower end of a push-pull rod, a hemispherical cavity is formed on the upper surface of a three-point floating pressure plate, and the hemispherical connector is installed in the hemispherical cavity for spherical connection. A clamping nail is installed at the bottom of the three-point floating pressure plate. During clamping, the clamping nail contacts the rough surface of the workpiece, and the spherical center line of the hemispherical cavity of the three-point floating pressure plate is offset from the spherical center line of the hemispherical connector, realizing the clamping action of the rough surface. However, during the use of the fixture, the environment is harsh and complex, and a large amount of cutting fluid and iron filings will be generated. If the cutting fluid and iron filings enter the spherical joint part, it will affect the fit between the two spherical surfaces, making the spherical contact unreliable, resulting in the deviation of the clamping force and affecting the machining quality of parts. Summary of the Invention

[0003] Aiming at the deficiencies existing in the prior art, the purpose of the utility model is to provide a gripper for a gantry-type three-point floating fixture, which can solve the technical problem that the deviation of the clamping force caused by the cutting fluid and iron filings entering the spherical joint part in the existing use affects the machining quality of parts.

[0004] To solve the above technical problems, the utility model is realized by adopting the following technical solutions:

[0005] A gripper for a gantry-type three-point floating fixture includes a push-pull rod connected to the telescopic rod of a hydraulic cylinder. The lower end of the push-pull rod is rotatably connected to a three-point floating pressure plate. A clamping nail is installed at the bottom of the three-point floating pressure plate. A cylindrical silica gel sleeve is sleeved on the push-pull rod, and the bottom of the silica gel sleeve contacts the upper surface of the three-point floating pressure plate.

[0006] The utility model further includes the following technical features:

[0007] The push-pull rod includes a coaxially arranged push-pull rod main body, a connecting rod, and a hemispherical connector. An installation hole penetrating through the top of the push-pull rod main body is axially formed on the push-pull rod main body. The lower end of the push-pull rod main body is connected to the top end of the connecting rod, and the bottom end of the connecting rod is fixedly connected to the upper surface of the hemispherical connector. A hemispherical cavity is formed on the upper surface of the three-point floating pressure plate. A circular convex wall coaxial with the hemispherical cavity is arranged at the opening of the hemispherical cavity. The hemispherical connector is installed in the hemispherical cavity, and the circular convex wall is clamped to the upper edge of the hemispherical connector.

[0008] The described silica gel sleeve includes a frustum-shaped silica gel sleeve body. An annular convex edge is integrally provided on the inner side of the top of the silica gel sleeve body. An annular installation groove is circumferentially formed on the side wall of the push rod main body. The annular convex edge is sleeved in the installation groove to install the silica gel sleeve body on the push rod main body;

[0009] An annular limiting groove coaxial with the hemispherical inner cavity is formed on the upper surface of the described three-point floating pressing plate. The bottom of the silica gel sleeve body is arranged in the annular limiting groove.

[0010] The described three-point floating pressing plate is an equilateral triangular prism. A plurality of liquid drainage through holes are formed on the three-point floating pressing plate. The top ends of the liquid drainage through holes penetrate the bottom surface of the hemispherical inner cavity, and the bottom ends of the liquid drainage through holes penetrate the side walls of the three-point floating pressing plate.

[0011] The described liquid drainage through hole includes an upper through hole and a lower through hole which are coaxially and integrally arranged. The aperture of the upper through hole is larger than that of the lower through hole.

[0012] The number of the described liquid drainage through holes is 3, and the 3 liquid drainage through holes are equidistantly distributed around the central axis of the hemispherical inner cavity.

[0013] The taper of the described silica gel sleeve body is 7° - 10°.

[0014] The thickness of the described silica gel sleeve body is 2 mm.

[0015] The angle between the central axis of the described liquid drainage through hole and the bottom surface of the three-point floating pressing plate is 30° - 45°.

[0016] The aperture of the described upper through hole is 3 mm, and the aperture of the described lower through hole is 2 mm.

[0017] Compared with the prior art, the utility model has the following technical effects:

[0018] By installing a frustum-shaped silica gel sleeve on the push rod and the three-point floating pressing plate, the utility model can effectively prevent cutting fluid and iron filings from entering the spherical joint part of the hemispherical connector and the hemispherical inner cavity during the process of machining parts. And by arranging liquid drainage through holes on the three-point floating pressing plate to drain a small amount of cutting fluid that enters the spherical joint part, the structure of the liquid drainage through hole with a larger upper part and a smaller lower part can prevent the cutting fluid from entering the hemispherical inner cavity from the side of the three-point floating pressing plate. This device makes the spherical contact between the hemispherical connector and the hemispherical inner cavity more reliable, improves the reliability of the gripper, ensures the clamping quality, and increases the finished product rate of part machining. Description of the Drawings

[0019] Figure 1 It is a schematic cross-sectional view of the overall structure of the utility model.

[0020] Figure 2 It is a schematic structural view of the push-pull rod of the present utility model.

[0021] Figure 3 It is a top view of the silica gel sleeve of the present utility model.

[0022] Figure 4 It is Figure 3 the E-E cross-sectional view of

[0023] Figure 5 It is a top view of the three-point floating pressing plate of the present utility model.

[0024] Figure 6 It is Figure 5 the F-F cross-sectional view of

[0025] The meanings of the various labels in the figure are as follows:

[0026] 1. Push-pull rod, 2. Three-point floating pressing plate, 3. Clamping nail, 4. Silica gel sleeve, 5. Hydraulic cylinder, 6. Telescopic rod;

[0027] 11. Push-pull rod body, 12. Connecting rod, 13. Hemispherical connecting head, 14. Mounting hole, 15. Mounting groove;

[0028] 21. Hemispherical inner cavity, 22. Annular convex wall, 23. Annular limiting groove, 24. Liquid discharge through hole;

[0029] 241. Upper through hole, 242. Lower through hole;

[0030] 41. Silica gel sleeve body, 42. Annular convex edge.

[0031] The following further elaborates on the specific content of the present utility model in conjunction with the embodiments. Specific Embodiments

[0032] Complying with the above technical solutions, the following specific embodiments of the present utility model are given. It should be noted that the present utility model is not limited to the following specific embodiments, and all equivalent transformations made on the basis of the technical solutions of this application fall within the protection scope of the present utility model.

[0033] In the present utility model, unless otherwise stated, the orientation words such as "upper", "lower", "left", "right", etc. are usually defined based on the drawing plane in the corresponding drawings, and "inner" and "outer" refer to the inside and outside of the contour of the corresponding components, and "longitudinal", "lateral", and "vertical" refer to the directions marked in the drawings.

[0034] Embodiment:

[0035] This embodiment provides a gripper for a gantry three-point floating fixture, as Figures 1 to 6As shown in the figure, it includes a push-pull rod 1 connected to the telescopic rod of the hydraulic cylinder. The lower end of the push-pull rod 1 is rotatably connected with a three-point floating pressing plate 2. A plurality of clamping nails 3 are installed at the bottom of the three-point floating pressing plate 2. A cylindrical silicone sleeve 4 is sleeved on the push-pull rod 1. The bottom of the silicone sleeve 4 is in contact with the upper surface of the three-point floating pressing plate 2. The silicone sleeve 4 forms physical protection at the connection between the push-pull rod 1 and the three-point floating pressing plate 2, effectively isolating cutting fluid and iron filings outside and preventing them from entering their joint parts, improving the contact stability at the connection between the push-pull rod 1 and the three-point floating pressing plate 2, avoiding the deviation of the clamping force, and improving the finished product rate of parts.

[0036] As a preferred solution of this embodiment, in this embodiment, the push-pull rod 1 includes a coaxially arranged push-pull rod main body 11, a connecting rod 12 and a hemispherical connecting head 13. An installation hole 14 penetrating the top of the push-pull rod main body is axially opened on the push-pull rod main body 11. The lower end of the push-pull rod main body 11 is connected to the top end of the connecting rod 12. The bottom end of the connecting rod 12 is fixedly connected to the upper surface of the hemispherical connecting head 13. A hemispherical inner cavity 21 is opened on the upper surface of the three-point floating pressing plate 2. A circular convex wall 22 coaxial with the hemispherical inner cavity 21 is provided at the opening of the hemispherical inner cavity 21. The hemispherical connecting head 13 is installed in the hemispherical inner cavity 21. The circular convex wall 22 is clamped on the upper edge of the hemispherical connecting head 13. The spherical connection mode between the hemispherical connecting head 13 and the hemispherical inner cavity 21 enables the three-point floating pressing plate 2 to rotate relative to the push-pull rod 1 in any direction when clamping a machined part with an uneven surface.

[0037] As a preferred solution of this embodiment, in this embodiment, the silicone sleeve 4 includes a frustum-shaped silicone sleeve main body 41. During operation, the frustum shape can provide a large activity space for the hemispherical connecting head 13 and the hemispherical inner cavity 21 while ensuring the sealing performance. An annular convex edge 42 is integrally provided on the inner side of the top of the silicone sleeve main body 41. An annular installation groove 15 is axially opened on the side wall of the push-pull rod main body 11. The annular convex edge 42 is sleeved in the installation groove 15 to install the silicone sleeve main body 41 on the push-pull rod main body 11, preventing the silicone sleeve 4 from loosening and improving the installation stability of the silicone sleeve 4.

[0038] Furthermore, an annular limiting groove 23 coaxial with the hemispherical inner cavity 21 is opened on the upper surface of the three-point floating pressing plate 2. The bottom of the silicone sleeve main body 41 is arranged in the annular limiting groove 23, thereby strengthening the sealing performance of the silicone sleeve 1.

[0039] As a preferred solution of this embodiment, in this embodiment, a plurality of liquid discharge through holes 24 are opened on the three-point floating pressing plate 2. The top end of the liquid discharge through hole 24 penetrates the bottom surface of the hemispherical inner cavity 21, and the bottom end of the liquid discharge through hole 24 penetrates the side wall of the three-point floating pressing plate 2. If a small amount of cutting fluid flows into the hemispherical inner cavity 21, it can flow out through the liquid discharge through holes 24.

[0040] Further, the liquid discharge through-hole 24 includes an upper through-hole 241 and a lower through-hole 242 which are coaxially and integrally arranged. The aperture of the upper through-hole 241 is larger than that of the lower through-hole 242. Specifically, the aperture of the upper through-hole 241 is 3 mm, and the aperture of the lower through-hole 242 is 2 mm. During the process of machining parts, it can ensure the smooth outflow of the cutting fluid and prevent the cutting fluid from entering the spherical joint part through the liquid discharge through-hole 24.

[0041] As a preferred solution of this embodiment, in this embodiment, the three-point floating pressure plate 2 is an equilateral triangular prism, and the number of the liquid discharge through-holes 24 is 3. The 3 liquid discharge through-holes 24 are equidistantly distributed around the central axis of the hemispherical inner cavity 21. The outlets of the lower through-holes 241 of the 3 liquid discharge through-holes 24 are respectively located on the three side walls of the three-point floating pressure plate 2. When it is necessary to clamp the machined parts, since the surface of the machined parts is uneven, during the process of the clamping nail 3 clamping the parts, the three-point floating pressure plate 2 will deflect at an angle relative to the push rod 1 to any one of its sides, and the cutting fluid entering the spherical joint part will effectively drain through the liquid discharge through-hole 24.

[0042] As a preferred solution of this embodiment, in this embodiment, the taper of the silicone sleeve body 41 is 7° - 10°. The setting of this angle is beneficial for the cutting fluid and iron filings to flow down along the outer wall of the silicone sleeve body 41 and will not accumulate liquid on the upper surface of the three-point floating pressure plate 2. Further, the thickness of the silicone sleeve body 41 is 2 mm. During the process of machining parts, the setting of this thickness enables the silicone sleeve body 41 to deform when there is an angular deviation between the push rod 1 and the three-point floating pressure plate 2, which not only does not affect the machining operation but also prevents the cutting fluid and iron filings from entering the connection part between the hemispherical connector 13 and the hemispherical inner cavity 21.

[0043] As a preferred solution of this embodiment, in this embodiment, the angle between the central axis of the liquid discharge through-hole 24 and the bottom surface of the three-point floating pressure plate 2 is 30° - 45°. The setting of this angle can not only smoothly discharge the cutting fluid in the hemispherical inner cavity 21 but also effectively prevent the cutting fluid from entering the spherical joint part.

[0044] During the actual operation of this embodiment:

[0045] 1. Install the gripper in this embodiment on the telescopic rod 6 of the hydraulic cylinder 5 of the gantry three-point floating fixture;

[0046] 2. After the machined parts are installed in place, the fixture is filled with hydraulic oil. The push rod 1 and the three-point floating pressure plate 2 drive the silicone sleeve 4 to move downward together under the action of the telescopic rod 6 until the multiple clamping nails 3 on the ground of the three-point floating pressure plate contact the blank surface of the machined parts. Since the blank surface of the machined parts is uneven, an angular deviation is generated between the three-point floating pressure plate 2 and the push rod 1, and then the machined parts are clamped.

[0047] 3. Start processing the parts. During the processing, the spherical joint part of the hemispherical connector 13 and the inner cavity of the hemispherical surface 21 is protected by the silicone sleeve 4, preventing cutting fluid and iron filings from entering. Even if a small amount of cutting fluid enters the spherical joint part, it will be discharged through the liquid discharge through hole 24 on the three-point floating pressing plate 2;

[0048] 4. After the parts are processed, the telescopic rod 6 drives the push-pull rod 1, the three-point floating pressing plate 2 and the silicone sleeve 4 to move upward, restoring to the initial position, and removing the processed parts, ending the entire processing process.

Claims

1. A gripper for a gantry - type three - point floating fixture, comprising a push - pull rod (1) connected to the telescopic rod of a hydraulic cylinder. The lower end of the push - pull rod (1) is rotatably connected to a three - point floating pressure plate (2), and a plurality of clamping nails (3) are installed at the bottom of the three - point floating pressure plate (2). It is characterized in that, A cylindrical silica gel sleeve (4) is sleeved on the push-pull rod (1), and the bottom of the silica gel sleeve (4) is in contact with the upper surface of the three-point floating pressure plate (2).

2. The gripper for the gantry three-point floating fixture according to claim 1, characterized in that, The push-pull rod (1) includes a push-pull rod main body (11), a connecting rod (12) and a hemispherical connecting head (13) arranged coaxially. An installation hole (14) penetrating through the top of the push-pull rod main body is axially formed on the push-pull rod main body (11). The lower end of the push-pull rod main body (11) is connected to the top end of the connecting rod (12), and the bottom end of the connecting rod (12) is fixedly connected to the upper surface of the hemispherical connecting head (13). A hemispherical inner cavity (21) is formed on the upper surface of the three-point floating pressure plate (2). An annular convex wall (22) coaxial with the hemispherical inner cavity (21) is arranged at the opening of the hemispherical inner cavity (21). The hemispherical connecting head (13) is installed in the hemispherical inner cavity (21), and the annular convex wall (22) is clamped on the upper edge of the hemispherical connecting head (13).

3. The gripper for the gantry three-point floating fixture according to claim 2, wherein, The silica gel sleeve (4) includes a frustum-shaped silica gel sleeve main body (41). An annular convex edge (42) is integrally arranged on the inner side of the top of the silica gel sleeve main body (41). An annular installation groove (15) is axially formed on the side wall of the push-pull rod main body (11). The annular convex edge (42) is sleeved in the installation groove (15) to install the silica gel sleeve main body (41) on the push-pull rod main body (11). An annular limit groove (23) coaxial with the hemispherical inner cavity (21) is formed on the upper surface of the three-point floating pressure plate (2). The bottom of the silica gel sleeve main body (41) is arranged in the annular limit groove (23).

4. The gripper for the gantry three-point floating fixture according to claim 3, characterized in that, The three-point floating pressure plate (2) is an equilateral triangular prism. A plurality of liquid discharge through holes (24) are formed on the three-point floating pressure plate (2). The top end of the liquid discharge through hole (24) penetrates the bottom surface of the hemispherical inner cavity (21), and the bottom end of the liquid discharge through hole (24) penetrates the side wall of the three-point floating pressure plate (2).

5. The gripper for the gantry three-point floating fixture according to claim 4, characterized in that The liquid discharge through hole (24) includes an upper through hole (241) and a lower through hole (242) integrally arranged coaxially. The aperture of the upper through hole (241) is larger than that of the lower through hole (242).

6. The gripper for the gantry three-point floating fixture according to claim 5, characterized in that, The number of the liquid discharge through holes (24) is 3, and the 3 liquid discharge through holes (24) are equidistantly distributed around the central axis of the hemispherical inner cavity (21).

7. The gripper for the gantry three-point floating fixture according to claim 3, characterized in that, The taper of the silica gel sleeve main body (41) is 7° - 10°.

8. The gripper for the gantry three-point floating fixture according to claim 3, characterized in that, The thickness of the silica gel sleeve main body (41) is 2 mm.

9. The gripper for the gantry three-point floating fixture according to claim 4, characterized in that, The angle between the central axis of the liquid discharge through hole (24) and the bottom surface of the three-point floating pressure plate (2) is 30° - 45°.

10. The gripper for the gantry three-point floating fixture according to claim 5, characterized in that, The aperture of the upper through hole (241) is 3 mm, and the aperture of the lower through hole (242) is 2 mm.

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