CN111687662A

CN111687662A - Braking mechanism

Info

Publication number: CN111687662A
Application number: CN202010585110.4A
Authority: CN
Inventors: 郭翠娟; 杜长林; 李亚鹏; 张海波; 邓鑫; 孙宏伟; 张国帅
Original assignee: Dalian Kede Numerical Control Co Ltd
Current assignee: Dalian Kede Numerical Control Co Ltd
Priority date: 2020-06-23
Filing date: 2020-06-23
Publication date: 2020-09-22

Abstract

The invention discloses a brake mechanism, which comprises a first caliper body, a second caliper body, a first pin shaft, an elastic piece and a driving device, wherein the first caliper body is provided with a first end and a second end; the first clamp body is hinged with the second clamp body through a first pin shaft; the first clamp body is provided with a first clamping part, the second clamp body is provided with a second clamping part, and the first clamping part and the second clamping part are oppositely arranged to form a jaw; the elastic piece is arranged between the first clamp body and the second clamp body and used for reducing the opening degree of the clamp jaw; the driving device is arranged between the first clamp body and the second clamp body and can be used for increasing the opening degree of the clamp jaws. The braking mechanism has the advantages of simple structure, reliable working performance and the like.

Description

Braking mechanism

Technical Field

The invention relates to the technical field of clamping mechanisms, in particular to a braking mechanism.

Background

In the mechanical industry, a clamping brake mechanism is widely applied to linear shaft movement and rotation of a rotating shaft, and a reliable and effective clamping mechanism is a precondition for ensuring normal work of parts and ensuring machining precision of a machine tool. For example, a swing head in a numerical control machine tool, generally called as a B-axis, a turntable, etc., needs to perform positioning processing on a designated plane or orientation feature of a workpiece, which requires that a corresponding rotating shaft can perform rapid positioning clamping and loosening; in addition, under the condition that the machine tool is suddenly powered off, the clamping swing shaft or the linear shaft can be quickly responded, and unnecessary collision is prevented. However, the existing clamping brake mechanism has the problems of complex structure, high processing cost, unreliable work and the like.

Disclosure of Invention

The invention provides a brake mechanism, which solves the problems of complex structure and high production cost of the conventional brake mechanism.

The technical means adopted by the invention are as follows:

a brake mechanism comprises a first caliper body, a second caliper body, a first pin shaft, an elastic piece and a driving device;

the first clamp body is hinged with the second clamp body through the first pin shaft;

the first clamp body is provided with a first clamping part, the second clamp body is provided with a second clamping part, and the first clamping part and the second clamping part are oppositely arranged to form a jaw;

the elastic piece is arranged between the first clamp body and the second clamp body and used for reducing the jaw opening degree;

the driving device is arranged between the first clamp body and the second clamp body and can be used for increasing the opening degree of the clamp jaws.

Further, the driving device is a hydraulic cylinder, the hydraulic cylinder is located on one side of the first caliper body/the second caliper body, a first through hole is formed in the first caliper body, a second through hole is formed in the second caliper body, a piston rod of the hydraulic cylinder penetrates through the first through hole and the second through hole, and a second pin shaft used for limiting the piston rod to the caliper body is arranged at the end portion of the piston rod.

Further, the elastic member is fitted over the piston rod.

Further, the elastic member is a disc spring.

Further, the hardness of the first clamping part and the second clamping part is smaller than that of the clamp body.

Further, the first clamping part is provided with a first clamping surface, the second clamping part is provided with a second clamping surface, and the first clamping surface and/or the second clamping surface are in line contact with the clamped workpiece.

Further, the cross section of the first clamping surface and/or the second clamping surface is a circular arc surface.

Further, the jaw and the hydraulic cylinder are positioned on the same side or opposite sides of the clamp body.

Further, the length of the force arm between the piston rod and the first pin shaft is larger than that between the jaw and the first pin shaft.

Compared with the prior art, the braking mechanism disclosed by the invention has the advantages that 1, the braking mechanism disclosed by the invention has the advantages of small number of parts, simple structure and convenience in production and processing; 2. when the braking mechanism disclosed by the invention is in a state of clamping a workpiece, the clamping force is provided by the elastic piece, so that the energy consumption is reduced, and the clamping reliability is ensured.

Drawings

Fig. 1 is a structural view of a brake mechanism disclosed in the present invention.

In the figure: 1. the clamp comprises a first clamp body, a first clamping part, a first through hole, a first clamping surface, a second clamp body, a first clamping part, a second clamping part, a first clamping surface, a second clamping part, a second through hole, a second clamping surface, a first pin shaft, a second pin shaft, an elastic part, a first pin shaft, a second elastic part, a hydraulic cylinder, a piston rod, a jaw, a second pin shaft and a clamped workpiece, wherein the first clamp body is 10, the first clamping part is 11, the first.

Detailed Description

Fig. 1 shows a brake mechanism disclosed by the present invention, which includes a first caliper body 1, a second caliper body 2, a first pin 3, an elastic member 4 and a driving device; the first clamp body 1 and the second clamp body 2 are hinged through the first pin shaft 3; a first clamping part 10 is arranged on the first forceps body 1, a second clamping part 20 is arranged on the second forceps body 2, and the first clamping part 10 and the second clamping part 20 are oppositely arranged to form a jaw 60; the elastic piece 4 is arranged between the first clamp body 1 and the second clamp body 2 and is used for reducing the opening degree of the clamp mouth 6; the driving device is disposed between the first caliper body 1 and the second caliper body 2 and is configured to increase the opening degree of the jaw, specifically, in this embodiment, the driving device is a hydraulic cylinder 5, the hydraulic cylinder 5 is located on one side of the first caliper body/the second caliper body, in the figure, the hydraulic cylinder 5 is located on one side of the second caliper body 2, the first caliper body 1 is provided with a first through hole 11, the second caliper body 2 is provided with a second through hole 21, a piston rod 50 of the hydraulic cylinder 5 passes through the second through hole 21 and the first through hole 20, and a second pin 7 for limiting the piston rod 50 on the caliper body is disposed at an end of the piston rod 50.

The working principle of the braking mechanism disclosed by the invention is as follows: when a clamped workpiece needs to be clamped, hydraulic oil is not introduced into the hydraulic cylinder, the hydraulic cylinder does not act, the first clamp body and the second clamp body rotate around the first pin shaft relatively under the action of the elastic piece (in the direction shown by B-B in the drawing), so that the distance between the ends, provided with the elastic piece, of the first clamp body and the second clamp body is increased (in the direction shown by A-A in the drawing), the opening degree of the jaw is reduced, the jaw is used for clamping the clamped workpiece, and at the moment, the elastic piece is used for providing clamping force for clamping the clamped workpiece. When a clamped workpiece needs to be loosened, hydraulic oil is introduced into the hydraulic cylinder, the piston rod moves and pulls the first clamp body to rotate to one side of the second clamp body through the second pin shaft, and the first clamp body and the second clamp body rotate around the first pin shaft, so that the distance between the ends, provided with the elastic pieces, of the first clamp body and the second clamp body is reduced, the opening degree of the jaw is increased, and the clamped workpiece is loosened.

Further, the elastic member 4 is sleeved on the piston rod 50, the elastic member is a disc spring, and the elastic member is a disc spring and is sleeved on the piston rod, so that the volume can be further reduced, and a sufficient clamping force can be provided.

Further, the hardness of the first clamping portion 10 and the second clamping portion 20 is less than that of the body of the pliers, i.e. the clamping portions are made of relatively soft material, such as tin bronze or beryllium bronze, and the body of the pliers can be made of harder material, such as 45 steel or QT 600. The clamping part is made of relatively soft materials, so that the clamped workpiece can be prevented from being damaged and abraded when being clamped.

Further, the first clamping portion 10 has a first clamping surface 12, the second clamping portion 20 has a second clamping surface 22, and the first clamping surface 12 and/or the second clamping surface 22 are in line contact with the clamped workpiece 8, and line contact is adopted, so that the clamped workpiece is ensured to be in close contact with the clamping surfaces, and the clamping reliability is improved.

Further, the cross section shape of the first clamping face 12 and/or the second clamping face 22 is an arc face, the arc face is adopted for convenient processing, meanwhile, the clamped workpiece is ensured to be in line contact with the clamping face, the clamping reliability is improved, and in the embodiment, a round rod with soft hardness is embedded into the clamping part to form the first clamping face and the second clamping face of the arc face shape.

Further, the length of the force arm between the piston rod 50 and the first pin shaft 3 is greater than that between the jaw 6 and the first pin shaft 3, so that a large clamping force can be obtained by a small spring force.

Further, the jaw and the hydraulic cylinder are located on the same side or opposite sides of the caliper body, and the jaw and the hydraulic cylinder are located on the same side of the caliper body in fig. 1, so that the jaw and the elastic member are located on two sides or the same side of the first pin shaft (the jaw and the elastic member are located on two sides of the first pin shaft in the horizontal direction in the drawing), and the size of the space occupied by the mechanism can be further reduced.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. A brake mechanism characterized by: the clamp comprises a first clamp body, a second clamp body, a first pin shaft, an elastic piece and a driving device;

2. The brake mechanism of claim 1, wherein: the driving device is a hydraulic cylinder, the hydraulic cylinder is located on one side of the first clamp body/the second clamp body, a first through hole is formed in the first clamp body, a second through hole is formed in the second clamp body, a piston rod of the hydraulic cylinder penetrates through the first through hole and the second through hole, and a second pin shaft used for limiting the piston rod on the clamp body is arranged at the end portion of the piston rod.

3. The brake mechanism of claim 2, wherein: the elastic piece is sleeved on the piston rod.

4. The brake mechanism according to any one of claims 1 to 3, characterized in that: the elastic piece is a disc spring.

5. The brake mechanism of claim 1, wherein: the hardness of the first clamping part and the second clamping part is less than that of the clamp body.

6. The brake mechanism according to claim 1 or 5, wherein: the first clamping part is provided with a first clamping surface, the second clamping part is provided with a second clamping surface, and the first clamping surface and/or the second clamping surface are in line contact with a clamped workpiece.

7. The brake mechanism of claim 6, wherein: the cross section of the first clamping surface and/or the second clamping surface is in the shape of a circular arc surface.

8. The brake mechanism of claim 2, wherein: the jaw and the hydraulic cylinder are positioned on the same side or opposite sides of the clamp body.

9. The brake mechanism of claim 8, wherein: the length of the force arm between the piston rod and the first pin shaft is larger than that between the jaw and the first pin shaft.