CN214538961U

CN214538961U - Reverse-thrust single-action clamp for tensile testing machine

Info

Publication number: CN214538961U
Application number: CN202120460480.5U
Authority: CN
Inventors: 王恩胜; 任梦鸿; 张恒
Original assignee: Jinan Hongjun Testing Machine Manufacturing Co ltd
Current assignee: Jinan Hongjun Testing Machine Manufacturing Co ltd
Priority date: 2021-03-03
Filing date: 2021-03-03
Publication date: 2021-10-29
Anticipated expiration: 2031-03-03

Abstract

The utility model belongs to the technical field of tensile test equipment uses, especially, relate to a tensile test machine is with backstepping list moves anchor clamps. Including the anchor clamps body and set up the centre gripping notch at the anchor clamps body middle part, be provided with the fixed jaw and the activity that set up relatively on the lateral wall of centre gripping notch and keep silent, the one end that the activity was kept away from to fixed jaw is provided with the fixed establishment of keeping silent, the activity is kept away from fixed jaw's one end and is provided with the pushing mechanism of keeping silent, the pushing mechanism of keeping silent is including setting up the internal horizontal sliding hydraulic cylinder at anchor clamps, the horizontal sliding hydraulic cylinder includes cylinder and the piston rod of suit on the cylinder, the cylinder is close to the setting of activity and keeps silent, piston rod and anchor clamps body fixed connection, be provided with the removal chamber that is used for the cylinder to remove in the anchor clamps body, the cylinder keeps silent with the activity and is connected the setting. The utility model discloses simple structure, processing convenience are fit for using widely on a large scale.

Description

Reverse-thrust single-action clamp for tensile testing machine

Technical Field

The utility model belongs to the technical field of tensile test equipment uses, especially, relate to a tensile test machine is with backstepping list moves anchor clamps.

Background

The tensile testing machine is also called a material tensile testing machine and a universal tensile strength testing machine, and is a new generation of mechanical detection equipment integrating computer control, automatic measurement, data acquisition, screen display and test result processing. The tensile testing machine is mainly suitable for testing metal and non-metal materials, and the sample is clamped mainly by the vertically arranged clamps in the conventional tensile testing machine, so that the purpose of the tensile test is achieved by moving the clamps.

The hydraulic horizontal pushing clamp commonly used on the tensile testing machine adopts the structural arrangement of double hydraulic cylinders, the extension bars of the hydraulic cylinders move relatively, a clamping mode is adopted to clamp a sample, the displacement of the two hydraulic cylinders is synchronous or not, the synchronous modes are mainly two, one is to use a mechanical synchronous mechanism, and the other is to use a servo valve or a synchronous valve to carry out synchronous control. The mechanical synchronization mechanism is used, a synchronization gear and a left rack and a right rack are meshed for transmission, the problem of difficulty in assembling and debugging is solved, in the long-term use process, the gear and rack meshing surface is abraded, the gap is increased, the two hydraulic cylinders are not synchronous in displacement motion, the hydraulic cylinders are not synchronous in displacement motion, and when the chucks at the two ends of the sample actually apply pulling force to the sample, the problem of large coaxiality error between the stress application central line and the sample axis is solved. And the servo valve is used for controlling the displacement synchronous movement of the hydraulic cylinder, so that the synchronous precision is high, but the use cost and the maintenance cost are high.

In order to solve the problems, people adopt a mode of matching a fixed chuck and a movable chuck to clamp a sample, so that the clamping can be realized only by driving the movable chuck by one hydraulic cylinder, but the clamping cannot be realized for a shorter sample, and the application range of a single hydraulic cylinder is further limited.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the technical problem that foretell single hydraulic cylinder anchor clamps of tensile testing machine existed, provide a reasonable in design, simple structure and centre gripping effectual, the wide reverse thrust single action anchor clamps for tensile testing machine of range of application.

In order to achieve the purpose, the utility model discloses a technical scheme do, the utility model provides a tensile test machine is with reverse thrust single action anchor clamps, including the anchor clamps body and set up the centre gripping notch at anchor clamps body middle part, be provided with the fixed jaw and the movable jaw that set up relatively on the lateral wall of centre gripping notch, the one end that fixed jaw kept away from movable jaw is provided with the fixed establishment of keeping silent, movable jaw keeps away from fixed jaw's one end and is provided with the pushing mechanism that keeps silent, the pushing mechanism that keeps silent is including setting up at the internal flat-pushing pneumatic cylinder of anchor clamps, the flat-pushing pneumatic cylinder includes cylinder and the piston rod of suit on the cylinder, the cylinder is close to the setting of movable jaw, piston rod and anchor clamps body fixed connection, be provided with the removal chamber that is used for the cylinder to remove in the anchor clamps body, the cylinder is connected the setting with movable jaw.

Preferably, an extension rod is arranged between the cylinder barrel and the movable jaw, and the extension rod and the cylinder barrel are eccentrically arranged.

Preferably, the moving cavity penetrates through one side of the fixture body, a piston flange is arranged on the fixture body, and the piston rod is fixed on the fixture body through the piston flange.

Preferably, the cylinder is sleeved with a guide ring for guiding.

Preferably, the jaw fixing mechanism comprises a tightening shaft connected with the fixed jaw and a fixed screw arranged at one end, far away from the fixed jaw, of the tightening shaft, a fixed nut is sleeved on the fixed screw, and an anti-rotation pin shaft is arranged between the fixed nut and the tightening shaft.

Preferably, a locking screw is arranged between the fixed screw rod and the jacking shaft, and the locking screw penetrates through the fixed screw rod.

Preferably, the opposite surfaces of the fixed jaw and the movable jaw are provided with V-shaped clamping grooves.

Compared with the prior art, the utility model has the advantages and positive effects that,

1. the utility model provides a tensile test machine reverse thrust single action anchor clamps through reverse setting to the horizontal push pneumatic cylinder, adopts piston rod and anchor clamps body fixed connection, and the structure of reverse thrust cylinder sets up for application of force area increases, and the atress is even, and then effectual realization to the centre gripping of short test, thereby solved the uneven problem of current single horizontal push pneumatic cylinder atress, simultaneously, the utility model discloses simple structure, processing convenience are fit for using widely on a large scale.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural view of a reverse-thrust single-action clamp for a tensile testing machine provided in embodiment 1;

FIG. 2 is a cross-sectional view of a reverse-thrust single-action jig for a tensile testing machine provided in example 1;

in the above figures, 1, a clamp body; 11. clamping the notch; 12. a piston flange; 2. fixing the jaw; 21. a V-shaped clamping groove; 3. a movable jaw; 4. a jaw fixing mechanism; 41. jacking the shaft; 42. fixing a lead screw; 43. fixing a nut; 44. an anti-rotation pin shaft; 45. locking the screw; 5. a jaw pushing mechanism; 51. a cylinder barrel; 52. a piston rod; 53. an extension bar; 54. a guide ring.

Detailed Description

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the present invention is not limited to the limitations of the specific embodiments of the present disclosure.

Embodiment 1, as shown in fig. 1 and 2, this embodiment is intended to solve the technical problem that the existing single hydraulic cylinder cannot clamp a short sample, and therefore, the reverse-thrust single-action clamp for the tensile testing machine provided in this embodiment includes a clamp body 1 and a clamping notch 11 disposed in the middle of the clamp body 1, in this embodiment, the clamp body 1 is integrally disposed in a rectangular parallelepiped shape, the clamp body 1 is integrally cast, but also may be a machined part, or a semi-open (or fully-open) solid structure, which can improve the rigidity of the whole clamp, the notch is disposed in the middle of the clamp body 1 to form the clamping notch 11 for the clamping test, the fixed jaw 2 and the movable jaw 3 are disposed on the side wall of the clamping notch 11, and as the name suggests, the fixed jaw 2 is fixed on the clamp body 1 without moving jaws, the movable jaw 3 is a jaw for moving and matching with the fixed jaw 2 to clamp and loosen a sample, for this reason, a jaw fixing mechanism 4 is arranged at one end of the fixed jaw 2 far away from the movable jaw 3, a jaw pushing mechanism 5 is arranged at one end of the movable jaw 3 far away from the fixed jaw 2, and of course, a cavity for placing the jaw fixing mechanism 4 and the jaw pushing mechanism 5 is arranged in the clamp body 1. In this embodiment, in order to move conveniently, the fixed jaw 2 and the movable jaw 3 are both in a cylindrical shape, and a V-shaped clamping groove 21 is formed in the opposite end faces of the fixed jaw and the movable jaw, and a plurality of protrusions are formed on the side walls of the V-shaped clamping groove 21, so that friction is increased, and a clamping effect is improved.

Considering that the existing horizontal pushing hydraulic cylinder drives the movable jaw 3 to move by utilizing the extension and contraction of the piston rod 52, which also results in the maximum clamping force of the central point of the whole movable jaw 3, so that the sample must be placed at the center of the movable jaw 3 of the upper and lower clamps to be effectively clamped, in order to disperse the clamping force, the clamping force of the movable jaw 3 is uniform, in this embodiment, the jaw pushing mechanism 5 comprises a horizontal pushing hydraulic cylinder arranged in the clamp body 1, the horizontal pushing hydraulic cylinder comprises a cylinder 51 and a piston rod 52 sleeved on the cylinder 51, in this embodiment, the cylinder 51 is arranged close to the movable jaw 3, the piston rod 52 is fixedly connected with the clamp body 1, a moving cavity for the cylinder 51 to move is arranged in the clamp body 1, and the cylinder 51 is connected with the movable jaw 3. Thus, when the horizontal pushing hydraulic cylinder works, the piston rod 52 adopts a fixed connection mode, so that the cylinder barrel 51 moves, the area of the cylinder barrel 51 is large, the clamping force generated by the cylinder barrel covers the whole movable jaw 3, and the stress of all parts of the movable jaw 3 is more uniform, so that the clamping of a shorter sample is met, and the application range of the horizontal pushing hydraulic cylinder is expanded. Meanwhile, the jaw is arranged on the cylinder 51, and the diameter of the cylinder 51 is larger than that of the piston rod 52, so that the rigidity deformation caused by lateral force in the test process is greatly reduced. In addition, if the piston rod 52 of the oil cylinder is connected to the jaw, the piston rod 52 is exposed to the environment where the scale of the sample itself is peeled off, and therefore the sealing portion of the piston rod 52 leaks oil due to the entry of dust particles. And the reverse oil cylinder thoroughly solves the problem.

In consideration of the fact that the movable jaw 3 and the cylinder 51 are both of a cylindrical structure, in order to reduce the degree of freedom of rotation of the cylinder 51, in the present embodiment, an extension rod 53 is provided between the cylinder 51 and the movable jaw 3, and the extension rod 53 and the cylinder 51 are eccentrically provided. Through the eccentric arrangement, the rotation freedom degree of the cylinder barrel 51 is limited, meanwhile, due to the eccentric arrangement of the extension rod 53 and the cylinder barrel 51, the diameter of the extension rod 53 is inevitably smaller than that of the cylinder barrel 51, so that the stress area is reduced, the clamping force is improved, and the diameter of the extension rod 53 is at least consistent with that of the movable jaw 3.

Considering that a horizontal pushing hydraulic oil cylinder is used as a power element, the problems of abrasion and the like cannot be avoided, for the sake of convenience of maintenance, in the embodiment, the moving cavity is arranged through one side of the clamp body 1, the piston flange 12 is arranged on the clamp body 1, the piston rod 52 is fixed on the clamp body 1 through the piston flange 12, and the piston flange 12 completes the closing of the moving cavity.

To further limit the degree of freedom of rotation of the cylinder 51, a guide ring 54 for guiding is fitted over the cylinder 51.

In view of the problem of ensuring the coaxiality of the force application center line and the sample axis in the conventional tensile test, the fixed jaw 2 may need to be finely adjusted for different samples, and for this reason, in the present embodiment, the jaw fixing mechanism 4 includes a tightening shaft 41 connected to the fixed jaw 2 and a fixed screw 42 provided at an end of the tightening shaft 41 away from the fixed jaw 2, so that the extension range of the fixed jaw 2 is adjusted by the rotation of the fixed screw 42, and similarly, in order to limit the rotational freedom of the tightening shaft 41, a fixing nut 43 is fitted over the fixed screw, and a rotation preventing pin 44 is provided between the fixing nut 43 and the tightening shaft 41.

In order to make the rotation of the fixed screw rod 42 drive the tightening shaft 41 to move, a locking screw 45 is arranged between the fixed screw rod 42 and the tightening shaft 41, and the locking screw 45 penetrates through the fixed screw rod. Therefore, the position of the fixed jaw 2 can be adjusted by rotating the fixed screw rod, so that accurate clamping of different samples is completed, and coaxiality is ensured.

Through the setting, the position of the fixed jaw 2 is adjusted, then the two ends of the sample are respectively placed in the two clamps arranged up and down, and the clamping of the horizontal pushing hydraulic oil cylinder is controlled, so that the related tensile test can be carried out.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may use the above-mentioned technical contents to change or modify the equivalent embodiment into equivalent changes and apply to other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical matters of the present invention will still fall within the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides a tensile test machine is with singly moving anchor clamps of backpulsion, includes the anchor clamps body and sets up the centre gripping notch at anchor clamps body middle part, be provided with the fixed jaw and the activity that set up relatively on the lateral wall of centre gripping notch and keep silent, the one end that the activity was kept away from to fixed jaw is provided with the fixed establishment of keeping silent, the activity is kept away from the one end of fixed jaw and is provided with the pushing mechanism of keeping silent, a serial communication port, the pushing mechanism of keeping silent is including setting up the internal horizontal-pushing pneumatic cylinder of anchor clamps, the horizontal-pushing pneumatic cylinder includes cylinder and the piston rod of suit on the cylinder, the cylinder is close to the setting of keeping silent, piston rod and anchor clamps body fixed connection, be provided with the removal chamber that is used for the cylinder to remove in the anchor clamps body, the cylinder sets up with keeping silent swing joint.

2. The reverse-pushing single-action clamp for the tensile testing machine according to claim 1, wherein an extension rod is arranged between the cylinder barrel and the movable jaw, and the extension rod and the cylinder barrel are eccentrically arranged.

3. The reverse-thrust single-action clamp for the tensile testing machine according to claim 2, wherein the moving cavity is arranged through one side of the clamp body, a piston flange is arranged on the clamp body, and the piston rod is fixed on the clamp body through the piston flange.

4. The reverse-thrust single-action clamp for the tensile testing machine according to claim 3, wherein a guide ring for guiding is sleeved on the cylinder barrel.

5. The reverse-thrust single-action clamp for the tensile testing machine according to claim 1 or 4, wherein the jaw fixing mechanism comprises a jacking shaft connected with the fixed jaw and a fixed screw arranged at one end of the jacking shaft far away from the fixed jaw, a fixed nut is sleeved on the fixed screw, and an anti-rotation pin shaft is arranged between the fixed nut and the jacking shaft.

6. The reverse-thrust single-action clamp for the tensile testing machine according to claim 5, wherein a locking screw is arranged between the fixed screw rod and the jacking shaft, and the locking screw penetrates through the fixed screw rod.

7. The reverse-thrust single-action clamp for the tensile testing machine according to claim 6, wherein V-shaped clamping grooves are formed in opposite surfaces of the fixed jaw and the movable jaw.