CN110549268A

CN110549268A - Pneumatic clamping device

Info

Publication number: CN110549268A
Application number: CN201910854285.8A
Authority: CN
Inventors: 叶祖福; 张强; 王熙泽; 吴苶
Original assignee: Huagong Farley Cutting and Welding System Engineering Co Ltd
Current assignee: Huagong Farley Cutting and Welding System Engineering Co Ltd
Priority date: 2019-09-10
Filing date: 2019-09-10
Publication date: 2019-12-10

Abstract

the invention discloses a pneumatic clamping device which comprises a support, an air cylinder, a guide rod, a first connecting block, a first pressure arm assembly and a second pressure arm assembly, wherein the air cylinder is arranged on the support, and the guide rod is arranged on the support; the first connecting block is sleeved on the guide rod and can reciprocate along the axial direction of the guide rod; the first pressure arm assembly and the second pressure arm assembly are symmetrically arranged on two sides of the first connecting block respectively, and the first connecting block is fixedly connected with one end of a piston rod of the air cylinder. Under the drive of cylinder, the piston rod of cylinder drives first connecting block and is reciprocating linear motion along the axis direction of guide bar to drive first pressure arm subassembly and the activity of second pressure arm subassembly, and then realize pressing from both sides the tight or loosen of work piece. The clamping device is novel in structure, can be driven by only one air cylinder to simultaneously clamp a workpiece by two pressing arm assemblies, greatly improves the positioning precision of the workpiece, and further improves the processing quality of the workpiece.

Description

Pneumatic clamping device

Technical Field

The invention relates to the technical field of machining, in particular to a pneumatic clamping device.

Background

in current mechanical clamps, clamping of a workpiece typically requires at least two clamping rams, one for each drive cylinder. The pressing process of the driving cylinder to the workpiece cannot be completely synchronous, so that the workpiece is easy to deform locally, and the quality of the workpiece is affected. In addition, in the case of a welding jig, when a welding space is narrow, a more compact jig is required.

Therefore, how to design a clamping device which has a compact structure and can drive a plurality of clamping pressure heads by adopting one driving air cylinder is a technical problem to be solved urgently by the technical personnel in the field.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides the pneumatic clamping device, two pressure arm assemblies can be simultaneously driven by only one air cylinder to clamp the workpiece, the positioning precision of the workpiece is greatly improved, and the processing qualified rate of the workpiece is further improved.

The technical scheme adopted by the invention for solving the problems is as follows:

The utility model provides a pneumatic clamping device, includes support, cylinder, guide bar, first connecting block, first pressure arm subassembly and second pressure arm subassembly, wherein:

The cylinder is arranged on the support;

The guide rod is arranged on the support;

The first connecting block is sleeved on the guide rod and can reciprocate along the axial direction of the guide rod;

The first pressure arm assembly and the second pressure arm assembly are symmetrically arranged on two sides of the first connecting block respectively;

the first connecting block is fixedly connected with one end of a piston rod of the air cylinder, and driven by the air cylinder, the first connecting block is driven to do reciprocating linear motion along the axis direction of the guide rod and drive the first pressure arm assembly and the second pressure arm assembly to move, so that a workpiece is clamped or loosened.

Therefore, the pneumatic clamping device is compact in structure, and the two pressure arm assemblies can be driven to clamp the workpiece at the same time by using one air cylinder, so that the positioning precision of the workpiece is greatly improved, and the processing quality of the workpiece is further improved.

Further, the first pressure arm assembly and the second pressure arm assembly are identical in structure and comprise pressure arms and connecting rods which are hinged with each other; the connecting rod is hinged to the first connecting block, and the pressing arm is hinged to the support.

therefore, when the first connecting block does reciprocating linear motion along the axis direction of the guide rod, the connecting rod can be driven to swing at the same time, and then the pressure arm hinged on the connecting rod is driven to swing around the support, so that the workpiece is clamped or loosened.

Further, the connecting rod is hinged with the first connecting block to form a first hinge point P, and the connecting rod is hinged with the pressure arm to form a second hinge point M; and a vertical line PO is arranged at the first hinge point P, and when an included angle alpha between a connecting line PM between the first hinge point P and the second hinge point M and the vertical line PO is a negative angle, the pneumatic clamping device is self-locked.

therefore, when the included angle alpha between the connecting line PM between the first hinge point P and the second hinge point M and the perpendicular line PO is a negative angle, according to the force relationship, the connecting rod cannot apply effective backward thrust to the first connecting block, so that the first pressure arm assembly and the second pressure arm assembly are always in a clamping state. Through the self-locking function of the clamping device, the problems of welding deformation of workpieces, limited cylinder clamping force and the like can be solved, and the problem that the workpieces fall off due to the fact that no clamping force exists after the cylinder is disconnected is solved.

Specifically, the included angle alpha ranges from-1 degree to-3 degrees.

Further, a bushing is arranged on the first connecting block at the position of the guide rod.

from this, set up the wearing and tearing that the bush can reduce between first connecting block and the guide bar, prevent that first connecting block from taking place to rock to clamping device's motion precision and durability have been improved.

Furthermore, the number of the guide rods is two, and the guide rods are symmetrically arranged on two sides of the piston rod of the air cylinder respectively.

Therefore, the two guide rods are arranged, so that the stability of the first connecting block moving on the guide rods can be further improved, and the movement precision and the durability of the clamping device are further improved.

Further, still include the elastic component, the elastic component cup joints on the guide bar, the elastic component is located between cylinder and the first connecting block.

therefore, the elastic piece is sleeved on the guide rod, when the air cylinder is in a gas-off state, the first pressure arm assembly and the second pressure arm assembly can always keep a clamping state under the action of the elastic force of the elastic piece, and the workpiece achieves a pre-clamping function.

Specifically, the elastic member is a coil spring.

Further, the handle is fixedly connected with the other end of the piston rod of the air cylinder.

From this, when pulling handle and drive the piston rod and promote backward, can open first pressure arm subassembly and second pressure arm subassembly, loosen the handle after accomplishing the dress, the work piece can realize pressing from both sides tightly fixedly in advance under the elastic action of elastic component, and the cylinder is ventilated afterwards and is pressed from both sides the work piece tightly again.

Further, still fixed mounting has the second connecting block on the cylinder, the handle articulates on the second connecting block.

Therefore, when the handle rotates around a hinge point hinged on the second connecting block, the handle can drive the piston rod of the air cylinder to reciprocate, and then the first connecting block is driven to reciprocate along the axis direction of the guide rod, so that the workpiece is clamped or loosened.

Compared with the prior art, the invention has the beneficial effects that:

(1) according to the pneumatic clamping device, two pressure arm assemblies can be driven to clamp a workpiece at the same time by using only one air cylinder, so that the positioning precision of the workpiece is greatly improved, and the processing quality of the workpiece is further improved.

(2) According to the pneumatic clamping device, when the included angle alpha between the connecting line PM between the first hinge point P and the second hinge point M and the perpendicular line PO is a negative angle, the connecting rod can not apply effective backward thrust to the first connecting block according to the force relationship, so that the first pressure arm assembly and the second pressure arm assembly are always in a clamping state. Through the self-locking function of the clamping device, the problems of welding deformation of workpieces, limited cylinder clamping force and the like can be solved, and the problem that the workpieces fall off due to the fact that no clamping force exists after the cylinder is disconnected is solved.

(3) According to the pneumatic clamping device, the elastic piece is sleeved on the guide rod, and when the air cylinder is in a gas-off state, the first pressure arm assembly and the second pressure arm assembly can always keep a clamping state under the action of the elastic force of the elastic piece, so that a workpiece achieves a pre-clamping function. Through manual operation handle, finally realized the manual work and adorned the back, the tight function of fixing of clamp in advance, the cylinder is ventilated and is pressed from both sides tightly again afterwards.

Drawings

FIG. 1 is a schematic structural view of a pneumatic clamping device of the present invention when clamping a workpiece;

FIG. 2 is a schematic view of the pneumatic clamping apparatus of the present invention shown in a configuration for unclamping a workpiece;

FIG. 3 is a schematic structural view of the support of FIG. 1;

FIG. 4 is a schematic structural diagram of the first connection block in FIG. 1;

FIG. 5 is a schematic view of the structure of the connecting rod of FIG. 1;

FIG. 6 is a schematic structural view of the pressing arm of FIG. 1;

FIG. 7 is a cross-sectional view of the pneumatic clamping device of the present invention;

Fig. 8 is a partially enlarged view of a portion a in fig. 7.

Wherein the reference numerals have the following meanings:

1. a support; 11. a first hinge hole; 12. a first mounting hole; 13. reinforcing ribs; 14. a second mounting hole; 2. a connecting seat; 3. a cylinder; 31. a piston rod; 4. a guide bar; 5. a first connection block; 51. mounting grooves; 511. a convex edge; 52. a third mounting hole; 53. a second hinge hole; 54. a bushing; 61. a first press arm assembly; 611. a connecting rod; 6111. a third hinge hole; 6112. a fourth hinge hole; 612. pressing the arm; 6121. a fifth hinge hole; 6122. a sixth hinge hole; 62. a second press arm assembly; 7. an elastic member; 81. a first piston rod joint; 82. a second piston rod joint; 821. a fourth mounting hole; 9. a second connecting block; 91. a seventh hinge hole; 10. a handle; 101. a fifth mounting hole; 102. an eighth hinge hole.

Detailed Description

for better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

As shown in fig. 1 to 7, the present invention provides a pneumatic clamping device, comprising: support 1, in this embodiment, this support 1 is the L type, including vertical part and horizontal part, and be provided with stiffening rib 13 in the corner of vertical part and horizontal part, can strengthen support 1's support intensity through setting up stiffening rib 13, in addition, be equipped with the first mounting hole 12 that is used for installing guide bar 4 on this support 1's the vertical part, this guide bar 4 is through first mounting hole 12 fixed connection on support 1, be equipped with a plurality of second mounting holes 14 that are used for erection joint seat 2 on this support 1's the horizontal part, fixed mounting has cylinder 3 on this connecting seat 2, be equipped with telescopic piston rod 31 in the cylinder 3. In this embodiment, the number of the guide rods 4 is two, and the guide rods are symmetrically arranged on the upper and lower sides of the piston rod 31. One end of the piston rod 31 is fixedly connected with a first piston rod joint 81, and meanwhile, the first piston rod joint 81 is cylindrical and is provided with an annular groove at the middle position. Still be connected with first connecting block 5 on this first piston rod connects 81, this first connecting block 5's intermediate position department is equipped with mounting groove 51, is equipped with a protruding edge 511 in this mounting groove 51, and the annular groove in this first piston rod connects 81 just blocks in this mounting groove 51, and with the protruding edge 511 looks butt in the mounting groove 51 to realize being connected between first connecting block 5 and the first piston rod connects 81. In addition, third mounting holes 52 are further formed in the first connecting block 5 at positions on the upper and lower sides of the mounting groove 51, in this embodiment, the size of the third mounting hole 52 matches with the rod diameter of the guide rod 4, and the distance between the two third mounting holes 52 is exactly the same as the distance between the two guide rods 4. The first connecting block 5 is sleeved on the guide rods 4 through the third mounting holes 52 and can do reciprocating linear motion along the axial direction of the two guide rods 4. In addition, in order to reduce the abrasion between the first connecting block 5 and the guide rod 4 and avoid the first connecting block 5 from shaking, a bushing 54 is further arranged at the third mounting hole 52, and the bushing 54 can improve the stability of the first connecting block 5 moving on the guide rod 4, thereby improving the motion precision and the durability of the clamping device.

In addition, the pneumatic clamping device further comprises a first pressure arm assembly 61 and a second pressure arm assembly 62, wherein the first pressure arm assembly 61 and the second pressure arm assembly 62 are identical in structure and comprise a pressure arm 612 and a connecting rod 611. The upper end and the lower end of the first connecting block 5 are both provided with notches, and both sides of each notch are both provided with second hinge holes 53; the end of the connecting rod 611 is provided with a third hinge hole 6111, and the second hinge hole 53 and the third hinge hole 6111 can be connected by a connecting pin, so as to realize the hinge connection between the first connecting block 5 and the connecting rod 611. One end of the pressing arm 612 is also provided with a notch, and both sides of the notch are provided with fifth hinge holes 6121, the other end of the connecting rod 611 is provided with fourth hinge holes 6112, and the fourth hinge holes 6112 and the fifth hinge holes 6121 are connected through a connecting pin, so that the hinge connection between the pressing arm 612 and the connecting rod 611 is realized. In addition, a sixth hinge hole 6122 is further disposed on the pressing arm 612, notches are also disposed at the upper and lower ends of the vertical portion of the support 1, first hinge holes 11 are disposed at two sides of the notch, and the first hinge holes 11 are connected to the sixth hinge hole 6122 through a connecting pin, so that the pressing arm 612 is hinged to the support 1.

Therefore, under the driving of the cylinder 3, the piston rod 31 of the cylinder 3 drives the first connecting block 5 to make a reciprocating linear motion along the axis direction of the guide rod 4, and drives the connecting rod 611 hinged on the first connecting block 5 to swing, so as to drive the pressing arm 612 hinged on the connecting rod 611 to swing around a hinge point hinged with the support 1, thereby clamping or loosening the workpiece.

In addition, as shown in fig. 7-8, the connecting rod 611 is hinged to the first connecting block 5 to form a first hinge point P, and the connecting rod 611 is hinged to the pressing arm 612 to form a second hinge point M; a vertical line PO is arranged at the first hinge point P, and when an included angle α between a connecting line PM between the first hinge point P and the second hinge point M and the vertical line PO is a negative angle, in this embodiment, the included angle α is-1 ° to-3 ° (preferably-2 °), and according to the force relationship, the connecting rod 611 cannot perform an effective backward thrust on the first connecting block 5, so that the first pressure arm assembly 61 and the second pressure arm assembly 62 are always in a clamping state, and at this time, the clamping device is in a self-locking state. Through the self-locking function of the clamping device, the problems of welding deformation of workpieces, limited cylinder clamping force and the like can be solved, and the problem that the workpieces drop because no clamping force exists after the cylinder 3 is cut off is solved.

The pneumatic clamping device further comprises an elastic member 7, in this embodiment, the elastic member 7 is a coil spring, and the elastic member 7 is sleeved on the guide rod 4 and is located between the first connecting block 5 and the cylinder 3. When the cylinder 3 is in the gas-off state, the first pressure arm assembly 61 and the second pressure arm assembly 62 can always keep the clamping state under the elastic force of the elastic member 7, so that the workpiece achieves the pre-clamping function.

The pneumatic clamping device further comprises a handle 10 and a second connecting block 9, the other end of the piston rod 31 is further connected with a second piston rod joint 82, a fourth mounting hole 821 is arranged on the second piston rod joint 82, a fifth mounting hole 101 is arranged on the handle 10, in the embodiment, the fifth mounting hole 101 is a kidney-shaped hole, and the fourth mounting hole 821 and the fifth mounting hole 101 are connected through a connecting pin, so that the connection between the second piston rod joint 82 and the handle 10 is realized; in addition, a second connecting block 9 is fixedly mounted on the cylinder 3, a notch is also formed in the second connecting block 9, seventh hinge holes 91 are formed in two sides of the notch, an eighth hinge hole 102 is further formed in the tail end of the handle 10, and the seventh hinge hole 91 is connected with the eighth hinge hole 102 through a connecting pin, so that the handle 10 is hinged to the second connecting block 9.

Therefore, by sleeving the elastic element 7 on the guide rod 4, when the air cylinder 3 is in a gas-off state, the first pressure arm assembly 61 and the second pressure arm assembly 62 can always keep a clamping state under the action of the elastic force of the elastic element 7, so that the workpiece achieves a pre-clamping function. When the pull handle 10 rotates backwards around the hinged point hinged with the second connecting block 9, the piston rod 31 can be driven to move backwards, the first pressure arm assembly 61 and the second pressure arm assembly 62 can be opened, the handle 10 is loosened after the assembly is completed, the workpiece can be pre-clamped and fixed under the elastic action of the elastic piece 7, then the air cylinder 3 is ventilated and then clamps the workpiece, and therefore the automatic clamping function of the air cylinder 3 can be achieved for some small workpieces.

In summary, the pneumatic clamping device of the present invention has the following beneficial effects:

(1) according to the pneumatic clamping device, two pressure arm assemblies can be driven to clamp a workpiece at the same time by using only one air cylinder 3, so that the positioning precision of the workpiece is greatly improved, and the processing quality of the workpiece is further improved.

(2) According to the pneumatic clamping device, when the included angle α between the connecting line PM between the first hinge point P and the second hinge point M and the perpendicular line PO is a negative angle, it can be known from the force relationship that the connecting rod 611 cannot apply effective backward thrust to the first connecting block 4, so that the first pressure arm assembly 61 and the second pressure arm assembly 62 are always in the clamping state. Through the self-locking function of the clamping device, the problems of welding deformation of workpieces, limited cylinder clamping force and the like can be solved, and the problem that the workpieces drop because no clamping force exists after the cylinder 3 is cut off is solved.

(3) According to the pneumatic clamping device, the elastic piece 7 is sleeved on the guide rod 4, and when the air cylinder 3 is in a gas-off state, the first pressure arm assembly 61 and the second pressure arm assembly 62 can be always in a clamping state under the action of the elastic force of the elastic piece 7, so that a workpiece achieves a pre-clamping function. Through manual operation handle 10, realized finally that the manual work is adorned the back, the function of tight fixed of clamp in advance, the tight again of clamp is ventilated to cylinder 3 afterwards.

The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.

Claims

1. A pneumatic clamping device comprises a support (1), a cylinder (3), a guide rod (4), a first connecting block (5), a first pressure arm assembly (61) and a second pressure arm assembly (62), wherein:

The cylinder (3) is arranged on the support (1);

the guide rod (4) is arranged on the support (1);

The first connecting block (5) is sleeved on the guide rod (4) and can reciprocate along the axial direction of the guide rod (4);

the first pressure arm assembly (61) and the second pressure arm assembly (62) are symmetrically arranged on two sides of the first connecting block (5) respectively;

The first connecting block (5) is fixedly connected with one end of a piston rod (31) of the air cylinder (3), and the first connecting block (5) is driven by the air cylinder (3) to do reciprocating linear motion along the axis direction of the guide rod (4) and drive the first pressure arm assembly (61) and the second pressure arm assembly (62) to move, so that clamping or loosening of a workpiece is realized.

2. The pneumatic clamping device according to claim 1, wherein said first pressing arm assembly (61) and said second pressing arm assembly (62) are structurally identical and each comprise a pressing arm (612) and a connecting rod (611) hinged to each other; the connecting rod (611) is hinged to the first connecting block (5), and the pressure arm (612) is hinged to the support (1).

3. the pneumatic clamping device according to claim 2, wherein the connecting rod (611) is hinged to the first connecting block (5) forming a first hinge point P, and the connecting rod (611) is hinged to the pressure arm (612) forming a second hinge point M; and a vertical line PO is arranged at the first hinge point P, and when an included angle alpha between a connecting line PM between the first hinge point P and the second hinge point M and the vertical line PO is a negative angle, the pneumatic clamping device is self-locked.

4. Pneumatic clamping device according to claim 3, characterised in that the angle α ranges from-1 ° to-3 °.

5. pneumatic clamping device according to claim 1, characterised in that a bushing (54) is provided on the first connecting block (5) at the location of the guide rod (4).

6. The pneumatic clamping device as claimed in claim 1, characterised in that the guide rods (4) are two and are arranged symmetrically on either side of the piston rod (31) of the cylinder (3).

7. Pneumatic clamping device according to any of claims 1 to 6, further comprising an elastic member (7), the elastic member (7) being sleeved on the guide rod (4), the elastic member (7) being located between the cylinder (3) and the first connecting block (5).

8. pneumatic clamping device according to claim 7, characterised in that the elastic element (7) is a helical spring.

9. The pneumatic clamping device according to claim 8, further comprising a handle (10), wherein the handle (10) is fixedly connected with the other end of the piston rod (31) of the cylinder (3).

10. Pneumatic clamping device according to claim 9, characterised in that a second connecting block (9) is also fixedly mounted on the cylinder (3), the handle (10) being hinged on the second connecting block (9).