CN215317208U - Self-centering hydraulic clamp - Google Patents
Self-centering hydraulic clamp Download PDFInfo
- Publication number
- CN215317208U CN215317208U CN201920260654.6U CN201920260654U CN215317208U CN 215317208 U CN215317208 U CN 215317208U CN 201920260654 U CN201920260654 U CN 201920260654U CN 215317208 U CN215317208 U CN 215317208U
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- hydraulic cylinder
- piston rod
- clamp
- workpiece
- hydraulic
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- 230000000694 effects Effects 0.000 claims description 2
- 238000003754 machining Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 23
- 230000002457 bidirectional effect Effects 0.000 description 4
- 239000010720 hydraulic oil Substances 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model relates to the field of machining parts, in particular to a clamp, and particularly relates to a self-centering hydraulic clamp which comprises a first hydraulic cylinder and a second hydraulic cylinder which are symmetrically arranged, wherein a first piston rod and a second piston rod which correspond to the first hydraulic cylinder and the second hydraulic cylinder are arranged close to each other, the inner ends of the first piston rod and the second piston rod are respectively screwed and fixedly connected with a workpiece clamp, the two workpiece clamps are symmetrically arranged and jointly act to clamp a workpiece, a front cavity of the first hydraulic cylinder is communicated with a rear cavity of the second hydraulic cylinder through a connecting oil pipe, the rear cavity of the first hydraulic cylinder is communicated with an oil tank of an external hydraulic system through an oil inlet pipe, and the front cavity of the second hydraulic cylinder is communicated with the oil tank of the external hydraulic system through an oil outlet pipe. The self-centering clamp is automatically clamped by the hydraulic system to improve the production efficiency, and is directly driven by the hydraulic system, so that the self-centering clamp is not worn in the clamping process, and the stability of clamping workpieces is improved.
Description
Technical Field
The utility model relates to the field of machining parts, in particular to a clamp, and particularly relates to a self-centering hydraulic clamp.
Background
When a workpiece is machined on a machine tool, a self-centering clamp is generally adopted for the purposes of machining consistency and reducing clamping errors.
Currently, there are many self-centering clamping fixtures on the market. One of the clamps is a manual clamping clamp, which is influenced by human factors and has the problem of low clamping efficiency.
The other type is an automatic clamp, a hydraulic oil cylinder drives a piston rod with a rack, the rack drives a gear and then drags the rack to realize bidirectional synchronous advance and retreat so as to achieve the aim of centering, and a hydraulic motor drags a positive screw and a negative screw to drive the positive screw and the negative screw to move so as to drive the clamp to realize bidirectional synchronous advance and retreat.
However, due to the gear rack, the long-term use of the screw nut has abrasion, so that the positioning and clamping errors exist, and the limitation is realized.
SUMMERY OF THE UTILITY MODEL
The technical scheme adopted by the utility model for solving one of the technical problems is as follows: the utility model provides a from centering hydraulically operated fixture, includes first pneumatic cylinder, the second pneumatic cylinder that two symmetries set up, and first piston rod, the second piston rod that first pneumatic cylinder, second pneumatic cylinder correspond are close to the setting each other, close soon respectively at the tip of the interior of first piston rod, second piston rod and link firmly a work piece holder, and two work piece holder symmetries set up and combined action realize the clamp tight to the work piece, the front chamber of first pneumatic cylinder with through connecting oil pipe intercommunication between the rear chamber of second pneumatic cylinder, the rear chamber of first pneumatic cylinder is linked together through advancing oil pipe and outside hydraulic system's oil tank, the front chamber of second pneumatic cylinder is linked together through going out oil pipe and outside hydraulic system's oil tank.
Preferably, the first hydraulic cylinder and the second hydraulic cylinder are both double-acting hydraulic cylinders and have the same structure.
The diameters of the first hydraulic cylinder and the second hydraulic cylinder are the same, and the diameter of a piston rod of the first hydraulic cylinder is the same as that of a piston rod of the second hydraulic cylinder.
The utility model has the beneficial effects that:
(1) this self-centering anchor clamps is by hydraulic system self-holding work piece, improves production efficiency.
(2) The self-centering clamp automatically centers a workpiece, adopts the universal clamping block (a cylindrical part is taken as an example in the application: a cylindrical part double-V-shaped block), has no limitation requirement on the size of the workpiece requiring centering, and improves the universality of the machined workpiece.
(3) The self-centering clamp is directly driven by a hydraulic system, and due to the incompressibility of hydraulic oil, abrasion in the clamping process does not exist, so that the stability of clamping workpieces is improved.
(4) The self-centering clamp is driven by a hydraulic system, and can be automatically aligned and clamped quickly and accurately, so that the working hours are reduced, the stability of the machining precision is improved, the production efficiency is improved, and the production cost is reduced.
(5) The self-centering clamp is wide in application range, suitable for machining workpieces with various requirements for consistent machining and alignment, capable of finishing centering and clamping the workpieces by replacing different positioning and clamping elements, and good in economical efficiency.
(6) The clamping force of the self-centering clamp is controllable by a hydraulic system, the clamping force can be controlled by adjusting the pressure of the system, the clamping force is more stable, the clamping is firm and reliable, and the stability of the precision of a machined workpiece is ensured.
(7) The clamp is only required to be replaced for workpieces of different shapes, the shape error of the workpieces is not required to be considered during clamping, the centers of the workpieces are kept fixed during clamping, the influence of the shape and the size of the workpieces is avoided, the traditional clamping error does not exist, and the processing consistency of the workpieces can be ensured.
Drawings
In order to more clearly illustrate the detailed description of the utility model or the technical solutions in the prior art, the drawings that are needed in the detailed description of the utility model or the prior art will be briefly described below. Throughout the drawings, like elements or components are generally identified by like reference numerals. In the drawings, elements or components are not necessarily drawn to scale.
Fig. 1 is a schematic view of the connection of components of the present invention.
In the figure, 1, a first hydraulic cylinder; 2. A first piston rod; 3. a workpiece holder; 4. A second piston rod; 5. A second hydraulic cylinder; 6. an oil outlet pipe; 7. a workpiece; 8. connecting an oil pipe; 9. an oil inlet pipe.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, a self-centering hydraulic clamp includes a first hydraulic cylinder 1 and a second hydraulic cylinder 5 which are symmetrically arranged, a first piston rod 2 and a second piston rod 4 corresponding to the first hydraulic cylinder 1 and the second hydraulic cylinder 5 are arranged close to each other, a work holder 3 is fixedly screwed at the inner end portions of the first piston rod 2 and the second piston rod 4 respectively, the two work holders 3 are symmetrically arranged and jointly act to clamp a workpiece 7, a front cavity of the first hydraulic cylinder 1 is communicated with a rear cavity of the second hydraulic cylinder 5 through a connecting oil pipe 8, the rear cavity of the first hydraulic cylinder 1 is communicated with an oil tank of an external hydraulic system through an oil inlet pipe 9, and the front cavity of the second hydraulic cylinder 5 is communicated with the oil tank of the external hydraulic system through an oil outlet pipe 6. The diameters of the first hydraulic cylinder 1 and the second hydraulic cylinder 5 are the same, and the diameter of the piston rod 2 of the first hydraulic cylinder is the same as that of the piston rod 4 of the second hydraulic cylinder.
Preferably, the first hydraulic cylinder 1 and the second hydraulic cylinder 5 are both double-acting hydraulic cylinders and have the same structure.
This from general hydraulic system of centering anchor clamps application, through two effect formula pneumatic cylinders of pole: the first hydraulic cylinder 1 and the second hydraulic cylinder 5 (the double-rod double-acting hydraulic cylinder is a hydraulic cylinder with piston rods on two sides of a piston, generally adopts bidirectional hydraulic drive and can realize constant-speed reciprocating motion) drag a positioning clamping element (for cylindrical parts, double-V-shaped blocks are adopted) to clamp a workpiece 7.
The self-centering clamp utilizes the incompressibility of oil liquid of a hydraulic system and the Pascal principle (the pressure change of a certain part of static fluid in a closed container is transmitted to all directions invariably), and the oil quantity coming out of a front cavity of a first hydraulic cylinder 1 enters a rear cavity of a second hydraulic cylinder 5 by connecting different front and rear cavities of two double-rod double-acting oil cylinders, so that the synchronous advance and retreat of the double-acting oil cylinders are realized, and a workpiece 7 is positioned and clamped simultaneously.
This from centering anchor clamps is equipped with adjustable relief pressure valve in hydraulic system, according to the formula: p = F/S, wherein P is pressure, F is pressure, and S is stress area, it can be known that, under the condition determined by the cylinder, the contact area S of the cylinder is obtained by the diameter D of the cylinder and the diameter of the piston rod, and S = pi (D)2-d2) And/4, D and D are determined, and the pressure P in the hydraulic system is adjusted through the pressure reducing valve to realize the magnitude of the clamping force and meet the requirements of different workpieces 7 on the clamping force.
Different positioning elements are designed according to different workpieces 7, and centering work on different workpieces 7 is completed by replacing the positioning elements, so that the universality is improved. Only the positioning element has to be replaced for different workpieces 7. For example, the outer circle of the circular workpiece 7 is often positioned by using a V-shaped block with an automatic centering function, and the two V-shaped blocks are close to each other at the same distance, so that the positioning and clamping requirements are met.
As shown in fig. 1, after a workpiece 7 is placed, a hydraulic system is started, an oil inlet pipe 9 is filled with oil, a rear cavity of a first hydraulic cylinder 1 is filled with oil, a piston rod is pushed to move forwards, hydraulic oil in a front cavity enters a rear cavity of a double-rod double-acting oil cylinder through a connecting oil pipe 8, the piston rod of the double-rod double-acting oil cylinder is pushed to move forwards, a V-shaped block clamp is driven, and bidirectional clamping and centering are achieved.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not cause the essence of the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of the present invention, and the technical solutions are all covered in the scope of the claims and the specification of the present invention; it will be apparent to those skilled in the art that any alternative modifications or variations to the embodiments of the present invention may be made within the scope of the present invention.
The present invention is not described in detail, but is known to those skilled in the art.
Claims (1)
1. The utility model provides a from centering hydraulically operated fixture which characterized in that: the hydraulic system comprises a first hydraulic cylinder and a second hydraulic cylinder which are symmetrically arranged, wherein a first piston rod and a second piston rod which correspond to the first hydraulic cylinder and the second hydraulic cylinder are arranged close to each other, inner end parts of the first piston rod and the second piston rod are respectively and fixedly screwed with a workpiece clamp, the two workpiece clamps are symmetrically arranged and jointly act to clamp a workpiece, a front cavity of the first hydraulic cylinder is communicated with a rear cavity of the second hydraulic cylinder through a connecting oil pipe, the rear cavity of the first hydraulic cylinder is communicated with an oil tank of an external hydraulic system through an oil inlet pipe, and the front cavity of the second hydraulic cylinder is communicated with the oil tank of the external hydraulic system through an oil outlet pipe;
the first hydraulic cylinder and the second hydraulic cylinder are double-acting hydraulic cylinders and have the same structure;
the diameters of the first hydraulic cylinder and the second hydraulic cylinder are the same, and the diameters of a piston rod of the first hydraulic cylinder and a piston rod of the second hydraulic cylinder are the same;
the workpiece is a circular workpiece, the workpiece clamps are V-shaped blocks matched with the circular workpiece, the V-shaped blocks have an automatic centering effect on the circular workpiece, and the V-shaped blocks are symmetrically arranged and act together to clamp the circular workpiece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920260654.6U CN215317208U (en) | 2019-03-01 | 2019-03-01 | Self-centering hydraulic clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920260654.6U CN215317208U (en) | 2019-03-01 | 2019-03-01 | Self-centering hydraulic clamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215317208U true CN215317208U (en) | 2021-12-28 |
Family
ID=79543931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920260654.6U Expired - Fee Related CN215317208U (en) | 2019-03-01 | 2019-03-01 | Self-centering hydraulic clamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215317208U (en) |
-
2019
- 2019-03-01 CN CN201920260654.6U patent/CN215317208U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211228 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |