CN215881367U - Clamp for externally holding cylindrical workpiece - Google Patents
Clamp for externally holding cylindrical workpiece Download PDFInfo
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- CN215881367U CN215881367U CN202121904265.6U CN202121904265U CN215881367U CN 215881367 U CN215881367 U CN 215881367U CN 202121904265 U CN202121904265 U CN 202121904265U CN 215881367 U CN215881367 U CN 215881367U
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Abstract
An external holding clamp for cylindrical workpieces is used for clamping workpieces with outer surfaces being circumferential surfaces, and belongs to the technical field of clamps, and comprises a cylindrical shell with openings at two ends, an expansion cavity is coaxially arranged between two ends in the cylindrical shell, the inner diameter of the expansion cavity is larger than that of the cylindrical shell, a cylindrical plug is coaxially arranged in the cylindrical shell, the outer circumferential surface of the cylindrical plug is in sliding and sealing connection with the inner circumferential surface of the cylindrical shell, a flange is arranged between two ends on the circumferential surface of the cylindrical plug, the circumferential surface of the flange is in sliding and sealing connection with the inner side wall of the expansion cavity, a through hole A communicated with the expansion cavity is arranged on the side wall of the cylindrical shell, the distance from the lower edge of the through hole A to the top wall of the expansion cavity is smaller than the thickness of the flange, a control tube is coaxially and fixedly arranged in the cylindrical plug, the upper end of the control tube extends out of the cylindrical shell, the upper end of the control tube is horn-shaped, and the problem that when the existing clamping tool clamps the workpieces is solved, the workpiece is easy to deform due to the fact that local pressure on the workpiece is too large.
Description
Technical Field
An outer holding clamp for a cylindrical workpiece is used for clamping the workpiece with the outer surface being a circumferential surface, and belongs to the technical field of clamps.
Background
The common clamp adopts a mechanical arm which is generally provided with two grippers, so that when a workpiece with the outer surface being a circumferential surface is gripped, the area of the workpiece acted by the gripping force exerted by the grippers on the workpiece is limited, and the workpiece is easily deformed due to overlarge local pressure applied to the workpiece.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model designs the externally-holding type clamp by adopting a mode of arranging the horn-shaped matching cylindrical shell at the upper end of the control tube, so that the clamping force on the circumferential surface of a workpiece can be kept uniform when the cylindrical or tubular workpiece is clamped, and the problem that the workpiece is easy to deform due to overlarge local pressure on the workpiece when the workpiece is clamped by the conventional clamping tool is solved.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:
an outer holding clamp for a cylindrical workpiece comprises a cylindrical shell with openings at two ends, an expansion cavity is coaxially arranged between the two ends in the cylindrical shell, the inner diameter of the expansion cavity is larger than that of the cylindrical shell, a cylindrical plug is coaxially arranged in the cylindrical shell, the outer circumferential surface of the cylindrical plug is in sliding and sealing connection with the inner circumferential surface of the cylindrical shell, a flange is arranged between the two ends on the circumferential surface of the cylindrical plug, the circumferential surface of the flange is in sliding and sealing connection with the inner side wall of the expansion cavity, the thickness of the flange is smaller than the height of the expansion cavity, a through hole A communicated with the expansion cavity is arranged on the side wall of the cylindrical shell, the distance from the lower edge of the through hole A to the top wall of the expansion cavity is smaller than that of the flange, a control tube is coaxially and fixedly arranged in the cylindrical plug, and the upper end of the control tube extends out of the cylindrical shell, the upper end of control tube is the horn type, the upper end axial of control tube is equipped with a plurality of notches, outside the one end of notch extended to the upper end of control tube, the external diameter of the horn type's of control tube head was greater than the internal diameter of tube-shape casing, the root of the horn type of control tube was less than the internal diameter of tube-shape casing, the upper end of control tube arrived the distance on the top of tube-shape casing is less than the distance between the roof of extension chamber to the diapire, be equipped with through-hole B on the tube-shape casing, the one end of through-hole B extends to the interior bottom surface in extension chamber, and the other end extends outside the tube-shape casing.
In the utility model, when in use, the through hole B of the cylindrical shell is connected with the cylinder (of course, a hydraulic cylinder can also be used), then the piston in the cylinder is pushed to inject the airflow into the expansion cavity from the through hole B, because the circumferential surface of the flange is in sliding and sealing connection with the inner side wall of the expansion cavity and the outer circumferential surface of the cylindrical plug is in sliding and sealing connection with the inner circumferential surface of the cylindrical shell, a sealed cavity is formed among the inner side wall of the expansion cavity, the lower surface of the flange and the inner bottom wall of the expansion cavity, thus after the airflow enters the expansion cavity through the through hole B, the lower surface of the flange is forced, the air in the part of the expansion cavity outside the upper surface of the flange is discharged out of the cylindrical shell from the through hole A, so that the flange and the cylindrical plug move upwards, the cylindrical plug moves upwards until the upper end of the control tube fixedly connected with the cylindrical plug leaves the upper end opening of the cylindrical shell in a horn shape, the notch is in a normal shape, then the trumpet-shaped opening of the control tube of the device is aligned with the end part of the cylindrical workpiece, so that one end of the workpiece is positioned in the trumpet-shaped opening of the control tube, at the moment, the air cylinder moves reversely, air is pumped into the lower part of the expansion cavity, which is positioned on the flange, so that the cylindrical plug and the control tube are simultaneously retracted into the cylindrical shell, because the outer diameter of the trumpet-shaped head part of the control tube is larger than the inner diameter of the cylindrical shell, the root part of the trumpet-shaped opening of the control tube is smaller than the inner diameter of the cylindrical shell, and the distance from the upper end of the control tube to the top end of the cylindrical shell is smaller than the distance from the top wall to the bottom wall of the expansion cavity, the trumpet-shaped opening of the control tube is tightened during the reverse movement of the air cylinder, so that the workpiece is clamped by the trumpet-shaped opening of the control tube, and because the upper end of the control tube is axially provided with a plurality of notches, therefore, when the workpiece is clamped, the clamping force of the non-notch parts on the horn shapes of all the control tubes is applied, and because the notches are arranged in a plurality of numbers, the clamping force applied to the circumferential surface of the workpiece is uniform, so that the problem that the workpiece is easy to deform due to the fact that the workpiece is subjected to overlarge local pressure is solved.
As a preferable mode, a clamping cavity with a circular cross section is coaxially arranged at the upper end of the control tube, the top end of the clamping cavity is open, and the depth of the clamping cavity is smaller than the length of the trumpet.
As a preferred mode, the tube-shape casing comprises columniform epitheca and the annular base of circle, it is protruding that the coaxial round that is equipped with on the base, the lower extreme in extension chamber extends to outside the epitheca, bellied internal diameter equals the internal diameter in extension chamber, through-hole B is located on the base, through-hole B's one end extends to bellied upper surface, through-hole B's the other end extends to outside the outer circumferential wall of base.
As a preferable mode, a circle of groove is coaxially arranged on the upper surface of the protrusion, and the groove is communicated with the through hole B.
As a preferable mode, blind holes are formed in opposite surfaces of the protrusion and the flange, a pin shaft is connected in the two blind holes in a sliding mode, one half of the length of the pin shaft is larger than the height of the expansion cavity minus the thickness of the flange, and the depth of the blind holes is equal to one half of the pin shaft.
Preferably, the projection and the outer circumferential surface of the flange are coaxially provided with a sealing ring.
Preferably, a spring is fixedly arranged between the upper surface of the flange and the top wall of the expansion chamber.
Compared with the prior art, the utility model has the beneficial effects that:
(1) the utility model designs the external holding type clamp by adopting the mode that the upper end of the control tube is arranged to be in horn-shaped matching with the cylindrical shell, so that the clamping force on the circumferential surface of a workpiece can be kept uniform when the cylindrical or tubular workpiece is clamped, and the problem that the workpiece is easy to deform because the local pressure on the workpiece is overlarge when the workpiece is clamped by the conventional clamping tool is solved.
(2) The cylindrical shell is changed into a split type design and is composed of the base and the upper shell, so that the cylindrical shell is convenient to manufacture, when a flange on the cylindrical plug is worn and needs to be repaired, the cylindrical shell can be directly disassembled, the cylindrical plug is replaced, the purpose that the inner diameter of the bulge is equal to the inner diameter of the expansion cavity is to enable the upper surface of the bulge to just form the inner bottom wall of the expansion cavity, and the inner surface of the bulge forms the inner surface of the lower end of the cylindrical shell.
Drawings
FIG. 1 is a cross-sectional view of the present invention in a vertical plane in which the axis of the through-hole B is located;
FIG. 2 is a cross-sectional view of the present invention taken along a vertical plane in which the axis of the pin lies;
fig. 3 is an exploded view of the present invention.
Wherein, 1, a cylindrical shell; 2. an expansion chamber; 3. a cylindrical plug; 4. a flange; 5. a through hole A; 6. a control tube; 7. a notch; 8. a through hole B; 9. a gripping cavity; 10. an upper shell; 11. a base; 12. a protrusion; 13. a groove; 14. blind holes; 15. a pin shaft; 16. a seal ring; 17. a spring; 18. a sleeve; 19. and (5) a workpiece.
Detailed Description
As shown in fig. 1-3, an external holding fixture for a cylindrical workpiece comprises a cylindrical shell 1 with two open ends, an expansion cavity 2 is coaxially arranged between the two ends in the cylindrical shell 1, the inner diameter of the expansion cavity 2 is larger than that of the cylindrical shell 1, a cylindrical plug 3 is coaxially arranged in the cylindrical shell 1, the outer circumferential surface of the cylindrical plug 3 is connected with the inner circumferential surface of the cylindrical shell 1 in a sliding and sealing manner, a flange 4 is arranged on the circumferential surface of the cylindrical plug 3 between the two ends, the circumferential surface of the flange 4 is connected with the inner side wall of the expansion cavity 2 in a sliding and sealing manner, the thickness of the flange 4 is smaller than the height of the expansion cavity 2, a through hole a5 communicating with the expansion cavity 2 is arranged on the side wall of the cylindrical shell 1, the distance between the lower edge of the through hole a5 and the top wall of the expansion cavity 2 is smaller than that of the flange 4, a control tube 6 is coaxially and fixedly arranged in the cylindrical plug 3, stretch out the upper end of control tube 6 outside tubular housing 1, the upper end of control tube 6 is the loudspeaker type, the upper end axial of control tube 6 is equipped with a plurality of notches 7, the one end of notch 7 extends outside the upper end of control tube 6, the external diameter of the head of the loudspeaker type of control tube 6 is greater than the internal diameter of tubular housing 1, the root of the loudspeaker type of control tube 6 is less than the internal diameter of tubular housing 1, the upper end of control tube 6 arrives the distance on the top of tubular housing 1 is less than the distance between the roof of extension chamber 2 to the diapire, be equipped with through-hole B8 on the tubular housing 1, the one end of through-hole B8 extends to the interior bottom surface of extension chamber 2, and the other end extends outside tubular housing 1.
In this embodiment, when in use, the through hole B8 of the cylindrical housing 1 is connected to a cylinder (of course, a hydraulic cylinder may be used), then a piston in the cylinder is pushed to inject an air flow into the expansion chamber 2 from the through hole B8, and a sealed chamber is formed between the inner side wall of the expansion chamber 2, the lower surface of the flange 4 and the inner bottom wall of the expansion chamber 2 due to the sliding and sealing connection of the circumferential surface of the flange 4 and the inner side wall of the expansion chamber 2 and the sliding and sealing connection of the outer circumferential surface of the cylindrical plug 3 and the inner circumferential surface of the cylindrical housing 1, so that after the air flow enters the expansion chamber 2 through the through hole B8, the lower surface of the flange 4 is forced, and the air in the portion of the expansion chamber 2 outside the upper surface of the flange 4 is expelled from the through hole a5 to the outside of the cylindrical housing 1, so that the flange 4 and the cylindrical plug 3 move upwards, and the cylindrical plug 3 moves upwards until the upper end of the control tube 6 fixedly connected to the cylindrical plug 3 is separated from the upper end opening of the cylindrical housing 1 in a trumpet shape Then, the notch 7 is in a normal shape, then the flared opening of the control tube 6 of the device of the present invention is aligned with the end of the cylindrical workpiece 19, so that one end of the workpiece 19 is located in the flared shape of the control tube 6, at this time, the cylinder moves in the reverse direction, the air is pumped toward the lower portion of the expansion chamber 2 located in the flange 4, so that the cylindrical plug 3 and the control tube 6 are simultaneously retracted into the cylindrical housing 1, because the outer diameter of the flared head of the control tube 6 is larger than the inner diameter of the cylindrical housing 1, the root of the flared shape of the control tube 6 is smaller than the inner diameter of the cylindrical housing 1, the distance from the upper end of the control tube 6 to the top end of the cylindrical housing 1 is smaller than the distance from the top wall to the bottom wall of the expansion chamber 2, so that during the reverse movement of the cylinder, the flared opening of the top end of the control tube 6 is tightened, so that the workpiece 19 is clamped by the flared opening of the control tube 6, because the upper end of the control tube 6 is axially provided with the plurality of notches 7, the workpiece 19 is subjected to clamping force of the parts, which are not the notches 7, on the trumpet shape of all the control tubes 6 when being clamped, and because the plurality of notches 7 are arranged, the clamping force on the circumferential surface of the workpiece 19 is uniform, so that the problem that the workpiece 19 is easy to deform due to overlarge local pressure on the workpiece 19 is solved.
Preferably, as shown in fig. 1 and 2, a clamping cavity 9 with a circular cross section is coaxially arranged at the upper end of the control tube 6, the top end of the clamping cavity 9 is open, the depth of the clamping cavity 9 is smaller than the length of the trumpet, and the inner diameter of the clamping cavity 9 is larger than the inner diameter of the control tube 6, so that when the workpiece 19 is clamped, the workpiece 19 is clamped through the clamping cavity 9, and the workpiece 19 is prevented from being inserted too deep into the control tube 6 and being not coaxial with the control tube 6.
Furthermore, the cylindrical shell 1 is composed of a cylindrical upper shell 10 and a circular base 11, a circle of protrusions 12 are coaxially arranged on the base 11, the lower end of the expansion cavity 2 extends out of the upper shell 10, the inner diameter of each protrusion 12 is equal to that of the expansion cavity 2, the through hole B8 is arranged on the base 11, one end of the through hole B8 extends to the upper surface of the protrusion 12, and the other end of the through hole B8 extends out of the outer circumferential wall of the base 11; by changing the cylindrical shell 1 into a split design, the cylindrical shell is composed of the base 11 and the upper shell 10, so that the manufacturing is convenient, when the flange 4 on the cylindrical plug 3 is worn and needs to be repaired, the cylindrical shell 1 can be directly disassembled, the cylindrical plug 3 is replaced, the inner diameter of the bulge 12 is equal to that of the expansion cavity 2, the upper surface of the bulge 12 just forms the inner bottom wall of the expansion cavity 2, and the inner surface of the bulge 12 forms the inner surface of the lower end of the cylindrical shell 1.
On the basis of setting up the tubular shell 1 as being constituted by base 11 and epitheca 10, it is more preferable, the upper surface of arch 12 is equipped with a round of recess 13 coaxially, recess 13 with through-hole B8 communicates, makes in the process that the air current gets into expansion chamber 2 from through-hole B8, can pass through notch 7, and the main objective is when preventing that flange 4 is in the diapire of expansion chamber 2 and the lower surface of flange 4 and the diapire of expansion chamber 2 contact, the air current is after notch 7, and the area that the air current applied force to flange 4 is the area of whole notch 7 projection on base 11, thereby makes things convenient for the air current to jack up tubular stopper 3.
On the basis that the cylindrical shell 1 is formed by the base 11 and the upper shell 10, preferably but not necessarily, as shown in fig. 2, blind holes 14 are arranged on the opposite surfaces of the protrusion 12 and the flange 4, a pin 15 is connected in the two blind holes 14 in a sliding manner, one half of the length of the pin 15 is greater than the height of the expansion cavity 2 minus the thickness of the flange 4, and the depth of the blind hole 14 is equal to one half of the depth of the pin 15, after the design, during assembly, the utility model is inverted according to the placement mode of fig. 1, and then the pin 15 is placed in the blind hole 14 on the lower surface of the flange 4 (because the surface of the flange 4 opposite to the protrusion 12 is the lower surface of the flange 4), at this time, because the depth of the blind hole 14 is equal to one half of the pin 15, a section of the pin 15 is exposed out of the blind hole 14 on the lower surface of the flange 4, then, the blind hole 14 on the protrusion 12 on the base 11 is aligned with the pin 15, so that a section of the pin 15 exposed out of the blind hole 14 on the lower surface of the flange 4 enters the blind hole 14 on the protrusion 12, and after the design, when the cylindrical plug 3 moves up and down in the expansion cavity 2, the cylindrical plug 3 cannot rotate around the axis of the cylindrical plug 3, and one half of the length of the pin 15 is greater than the height of the expansion cavity 2 minus the thickness of the flange 4, so that when the cylindrical plug 3 moves up and down in the expansion cavity 2, the pin 15 cannot fall off from the blind hole 14 all the time.
On the basis that the cylindrical shell 1 is formed by the base 11 and the upper shell 10, the sealing rings 16 are coaxially arranged on the outer circumferential surfaces of the bulge 12 and the flange 4, and the airtightness of the expansion cavity 2 can be better kept through the arrangement of the sealing rings 16.
Preferably, a spring 17 is fixedly arranged between the upper surface of the flange 4 and the top wall of the expansion chamber 2, and the spring 17 can avoid the situation that the upper surface of the flange 4 is attached to the inner top wall of the expansion chamber 2, so that the cylindrical plug 3 is insensitive when the workpiece 19 is clamped.
Preferably, a sleeve 18 may be provided at the upper end opening of the cylindrical shell 1, and the inner surface of the upper end of the sleeve 18 is provided with an inverted cone shape fitted with the cylindrical plug 3.
Claims (7)
1. The outer holding clamp for the cylindrical workpiece is characterized by comprising a cylindrical shell (1) with two open ends, an expansion cavity (2) is coaxially arranged between the two ends in the cylindrical shell (1), the inner diameter of the expansion cavity (2) is larger than that of the cylindrical shell (1), a cylindrical plug (3) is coaxially arranged in the cylindrical shell (1), the outer circumferential surface of the cylindrical plug (3) is in sliding and sealing connection with the inner circumferential surface of the cylindrical shell (1), a flange (4) is arranged between the two ends of the circumferential surface of the cylindrical plug (3), the circumferential surface of the flange (4) is in sliding and sealing connection with the inner side wall of the expansion cavity (2), the thickness of the flange (4) is smaller than the height of the expansion cavity (2), and a through hole A (5) communicated with the expansion cavity (2) is formed in the side wall of the cylindrical shell (1), the distance between the lower edge of the through hole A (5) and the top wall of the expansion cavity (2) is smaller than the thickness of the flange (4), a control tube (6) is coaxially and fixedly arranged in the cylindrical plug (3), the upper end of the control tube (6) extends out of the cylindrical shell (1), the upper end of the control tube (6) is horn-shaped, a plurality of notches (7) are axially arranged at the upper end of the control tube (6), one end of each notch (7) extends out of the upper end of the control tube (6), the outer diameter of the horn-shaped head of the control tube (6) is larger than the inner diameter of the cylindrical shell (1), the root of the horn-shaped head of the control tube (6) is smaller than the inner diameter of the cylindrical shell (1), and the distance between the upper end of the control tube (6) and the top end of the cylindrical shell (1) is smaller than the distance between the top wall and the bottom wall of the expansion cavity (2), be equipped with through-hole B (8) on tube-shape casing (1), the one end of through-hole B (8) extends to the interior bottom surface in extension chamber (2), and the other end extends outside tube-shape casing (1).
2. The clamp for holding a cylindrical workpiece outside is characterized in that the upper end of the control tube (6) is coaxially provided with a clamping cavity (9) with a circular cross section, the top end of the clamping cavity (9) is open, and the depth of the clamping cavity (9) is smaller than the length of the trumpet.
3. The outer holding clamp for the cylindrical workpiece as recited in claim 1, wherein the cylindrical shell (1) is composed of a cylindrical upper shell (10) and a circular base (11), a circle of protrusions (12) are coaxially arranged on the base (11), the lower end of the expansion cavity (2) extends out of the upper shell (10), the inner diameter of the protrusions (12) is equal to the inner diameter of the expansion cavity (2), the through hole B (8) is arranged on the base (11), one end of the through hole B (8) extends to the upper surface of the protrusions (12), and the other end of the through hole B (8) extends out of the outer circumferential wall of the base (11).
4. A clamp for holding a cylindrical workpiece outside according to claim 3, wherein the upper surface of the protrusion (12) is coaxially provided with a ring of grooves (13), and the grooves (13) are communicated with the through hole B (8).
5. The clamp for holding a cylindrical workpiece outside is characterized in that blind holes (14) are formed in the opposite surfaces of the protrusion (12) and the flange (4), a pin shaft (15) is connected in the two blind holes (14) in a sliding mode, one half of the length of the pin shaft (15) is larger than the height of the expansion cavity (2) minus the thickness of the flange (4), and the depth of the blind hole (14) is equal to one half of the depth of the pin shaft (15).
6. A clamp for holding a cylindrical workpiece in place in an outer holder as defined in claim 3, wherein the projection (12) and the flange (4) are provided with sealing rings (16) coaxially on the outer circumferential surface.
7. A clamp for embracing cylindrical workpieces as defined in claim 3, wherein a spring (17) is fixedly arranged between the upper surface of the flange (4) and the top wall of said expansion chamber (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121904265.6U CN215881367U (en) | 2021-08-13 | 2021-08-13 | Clamp for externally holding cylindrical workpiece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121904265.6U CN215881367U (en) | 2021-08-13 | 2021-08-13 | Clamp for externally holding cylindrical workpiece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215881367U true CN215881367U (en) | 2022-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121904265.6U Active CN215881367U (en) | 2021-08-13 | 2021-08-13 | Clamp for externally holding cylindrical workpiece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215881367U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115194500A (en) * | 2022-06-29 | 2022-10-18 | 镇江合力汽车紧固件有限公司 | Special guide rod processing positioner of pincers |
-
2021
- 2021-08-13 CN CN202121904265.6U patent/CN215881367U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115194500A (en) * | 2022-06-29 | 2022-10-18 | 镇江合力汽车紧固件有限公司 | Special guide rod processing positioner of pincers |
| CN115194500B (en) * | 2022-06-29 | 2024-04-26 | 镇江合力汽车紧固件有限公司 | Guide rod machining and positioning device special for calipers |
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