CN214277679U

CN214277679U - Hydraulic clamp for universal testing machine

Info

Publication number: CN214277679U
Application number: CN202023089719.7U
Authority: CN
Inventors: 徐中林; 王金龙; 孙云江; 秦纯杰
Original assignee: Jinan Xinluchang Test Machine Co ltd
Current assignee: Jinan Xinluchang Test Machine Co ltd
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-09-24
Anticipated expiration: 2030-12-18

Abstract

The application relates to the technical field of mechanical property of metal materials, in particular to a hydraulic clamp for a universal testing machine, which comprises a base and a clamping piece, wherein the base is provided with a groove penetrating through two opposite side surfaces of the base, two hydraulic cylinders are arranged in the base, piston rods of the hydraulic cylinders penetrate out from the opposite side walls of the groove, the clamping piece is arranged on the piston rods of the hydraulic cylinders, the hydraulic cylinders drive the clamping piece to move towards the direction of approaching to or separating from each other, two opposite side walls of the groove are rotatably connected with supporting components, one end of the supporting component far away from the side walls is abutted to a detected workpiece, the clamping force applied to the workpiece is in the horizontal direction, the workpiece has the tendency of moving upwards when the workpiece is stretched, the workpiece can be separated from the clamping piece when the testing force is too large, the supporting component is rotated to the position abutted to the workpiece, and the force opposite to the testing force can be applied to the workpiece, the phenomenon that the workpiece moves along the direction of the test force is reduced.

Description

Hydraulic clamp for universal testing machine

Technical Field

The application relates to the technical field of mechanical properties of metal materials, in particular to a hydraulic clamp for a universal testing machine.

Background

The universal testing machine integrates the functions of stretching, bending, compressing, shearing, ring rigidity and the like, is mainly used for mechanical property tests of metal and nonmetal materials, is ideal detection equipment, and clamps a workpiece by using a jaw or a clamp when the workpiece is tested.

At present, a Chinese utility model patent with publication number CN206038429U discloses a servo electric cylinder force-applying type horizontal-pushing clamp testing machine, which comprises a base, guide upright posts, an upper cross beam, a servo electric cylinder and a hydraulic horizontal-pushing clamp, wherein the upper cross beam is connected with the base through at least two guide upright posts; an upper bearing beam capable of sliding up and down is sleeved on the guide upright post, a lower bearing beam and a tension-compression type spoke sensor are arranged at the lower end of the upper bearing beam, and the movable end of the servo electric cylinder is connected with the upper bearing beam; the hydraulic horizontal pushing clamp comprises an upper horizontal pushing clamp and a lower horizontal pushing clamp which are arranged on an upper bearing cross beam and a lower bearing cross beam, the upper horizontal pushing clamp comprises an upper clamp body and a cylinder barrel, a piston assembly is arranged in the cylinder barrel and comprises a piston and a piston rod which are integrally formed, the outer side of the piston assembly is sealed by an end cover, and a horizontal pushing clamping piece is arranged at one end of the piston rod.

In view of the above-mentioned related art, the inventor believes that the workpiece may be subjected to a test force in a vertical direction when the test machine performs a pull-out test, and when the test force is too large, the clamp may not clamp the workpiece, so that the workpiece slides along the direction of the test force, and the test result is affected.

SUMMERY OF THE UTILITY MODEL

In order to improve the phenomenon that the work piece can slide in the process of the test, the application provides a hydraulic clamp for universal testing machine.

The application provides a hydraulic fixture for universal testing machine adopts following technical scheme:

the utility model provides a hydraulic fixture for universal testing machine, hydraulic fixture includes base and holder, set up the recess that runs through the relative both sides face of base on the base, base internally mounted has two pneumatic cylinders, the piston rod of pneumatic cylinder is worn out from the relative lateral wall of recess, install the holder on the piston rod of pneumatic cylinder, the direction that pneumatic cylinder drive holder orientation was close to each other or was kept away from each other removes, all set up supporting component on the relative both sides wall of recess, supporting component is shaft-like, and the slope sets up on the lateral wall of recess, and one end is connected with the lateral wall of recess, and the other end and the work piece butt that is detected, supporting component has the component of directional pedestal bottom surface.

Through adopting above-mentioned technical scheme, when using the performance of universal test machine detection work piece, the both ends of work piece are pressed from both sides tightly by two anchor clamps respectively, and the clamping-force that the work piece received is the horizontal direction, and experimental power is vertical direction, and the work piece has along the trend at experimental power direction motion in the experimentation, and the work piece can slide along experimental power direction when experimental power is too big. The supporting component is rotated to be abutted against the workpiece, and is arranged in a rod shape and in an inclined mode, the supporting component can give component force to the workpiece in the vertical direction, the direction of the component force is opposite to the direction of the test force, and the phenomenon that the workpiece moves along the direction of the test force can be reduced.

Optionally, the support assembly includes a fixed sleeve and a movable sleeve, the fixed sleeve is rotatably connected with the side wall of the groove, the movable sleeve is telescopically sleeved with the fixed sleeve, and a rubber pad is arranged at one end of the movable sleeve away from the fixed sleeve;

the fixed sleeve and the movable sleeve are fixed through a positioning bolt, and the positioning bolt is in threaded connection with the fixed sleeve and is abutted to the movable sleeve.

By adopting the technical scheme, the workpieces used in the test process are different in possible shapes, the rubber pad is arranged at the end part of the movable sleeve, and the rubber pad can deform after being extruded and can be better attached to the workpieces, so that the movable sleeve is better abutted to the workpieces; the length of the supporting component can be changed by sliding the movable sleeve, because the diameters of different workpieces are different, the distance between the workpiece and the side wall of the groove is short when the diameter is large, and the distance between the workpiece and the side wall of the groove is long when the diameter is small, so that the length of the supporting component can be adjusted according to the distance between the workpiece and the side wall of the groove.

Optionally, a clamping groove matched with the shape of the workpiece is formed in the side wall, close to each other, of the clamping piece.

By adopting the technical scheme, when the performance of the workpiece is detected, the workpiece needs to be placed between the clamping grooves of the two clamping pieces, so that the contact area between the workpiece and the clamping pieces is increased, and the stress of the workpiece is more balanced when the workpiece is clamped.

Optionally, mounting holes are formed in the clamping piece and the piston rod of the hydraulic cylinder, a first fixing bolt penetrates through the mounting holes, and the clamping piece and the piston rod are connected through the first fixing bolt.

Through adopting above-mentioned technical scheme, the holder can be dismantled with the piston rod through first fixing bolt and be connected, probably is different to the shape of different work pieces, and the staff can select assorted holder to install on the piston rod according to the shape of work piece.

Optionally, the clamping groove surface is provided with a non-slip pad, the surface of the clamping groove is provided with a strip-shaped groove, and the non-slip pad is connected with the strip-shaped groove in a clamping mode.

Through adopting above-mentioned technical scheme, the slipmat can increase the frictional force between work piece and the holder, can prevent the work piece at the motion trend of experimental power direction, has reduced the phenomenon of work piece and holder separation, because slipmat and draw-in groove can be dismantled and be connected, can dismantle after the slipmat is ageing and get off to change.

Optionally, an oil inlet pipe and an oil outlet pipe are arranged on the outer side of the base, the oil inlet pipe is provided with an input end and two output ends, the input end of the oil inlet pipe is connected with an oil outlet of the hydraulic system, and the two output ends of the oil inlet pipe are respectively connected with the two hydraulic cylinders;

the oil outlet pipe is provided with two output ends and two input ends, the output end of the oil outlet pipe is connected with an oil return port of the hydraulic system, and the two input ends of the oil outlet pipe are respectively connected with the two hydraulic cylinders.

Through adopting above-mentioned technical scheme, the oil feed of two pneumatic cylinders is controlled by same hydraulic system with producing oil for the piston rod of two pneumatic cylinders extends simultaneously or contracts simultaneously, makes the atress axiality of testing machine receive the influence as few as possible.

Optionally, the bottom surface of the groove is rounded.

Through adopting above-mentioned technical scheme, at the tensile in-process of work piece, the pulling force that the work piece received can split when too big and produce the piece, and the piece can fall the bottom surface department of trapezoidal recess, and the fillet can be convenient for the staff clearance piece, reduces the piece and remains in trapezoidal recess.

Optionally, the hydraulic cylinder is detachably connected to the base, and the side faces, far away from each other, of the base are connected with the cylinder body of the hydraulic cylinder through a second fixing bolt.

Through adopting above-mentioned technical scheme, must guarantee that the displacement volume of two pneumatic cylinders is the same when testing, the pneumatic cylinder takes place slight trouble and all probably leads to the displacement volume different, can dismantle the maintenance when breaking down.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the base is provided with a supporting component which is abutted against the workpiece, and the supporting component has a component force in the vertical direction to the force of the workpiece, so that the phenomenon that the workpiece slides along the direction of the test force can be reduced;

2. the anti-slip pad is arranged at the position where the clamping piece is contacted with the workpiece, so that the friction force between the workpiece and the clamping piece is increased, and the phenomenon of workpiece sliding is further reduced.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 2 is a schematic structural view of a lower clamp in an embodiment of the present application;

FIG. 3 is a partial cross-sectional view of a lower clamp in an embodiment of the present application;

fig. 4 is an enlarged view at a in fig. 2.

Description of reference numerals: 100. a base; 200. a support pillar; 300. a hydraulic clamp; 310. an upper clamp; 320. a lower clamp; 321. a base; 322. a clamping member; 3211. a groove; 3221. a card slot; 3222. a strip-shaped groove; 323. rounding off; 330. a non-slip mat; 400. a hydraulic cylinder; 410. a piston rod; 411. a first fixing bolt; 420. a cylinder body; 421. a second fixing bolt; 430. a hydraulic system; 440. an oil pipe; 441. an oil inlet pipe; 442. an oil outlet pipe; 510. fixing the sleeve; 511. a rotating shaft; 520. a movable sleeve; 521. a rubber pad; 530. positioning the bolt; 600. the cylinder is driven.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

Referring to fig. 1, the universal tester comprises a base 100, a support column 200 and a hydraulic clamp 300, wherein the support column 200 is vertically arranged above the base 100, and the hydraulic clamp 300 is slidably connected to the support column 200 and is symmetrical to each other. The hydraulic clamp 300 comprises an upper clamp 310 and a lower clamp 320, wherein the upper clamp 310 and the lower clamp 320 have the same shape and are symmetrically arranged at two ends of the supporting column 200, and a driving cylinder 600 is arranged above the upper clamp 310 and can drive the upper clamp 310 to slide towards a direction close to the lower clamp 320 or away from the lower clamp 320. When the performance of the workpiece is detected, one end of the workpiece is clamped by the upper clamp 310, the other end of the workpiece is clamped by the lower clamp 320, the upper clamp 310 and the lower clamp 320 are far away from each other when a drawing test is carried out, and the clamping piece is subjected to a test force in the vertical direction.

In order to reduce and draw the phenomenon emergence that the work piece that the too big work piece that leads to of test force slided along the direction of test force in the test process, this application has proposed a hydraulic clamp for omnipotent testing machine.

Since the upper jig 310 and the lower jig 320 are only installed at different positions, only the lower jig 320 will be described in the embodiment of the present application. Referring to fig. 2 and 3, the lower fixture 320 includes a base 321 and a clamping member 322, a groove 3211 penetrating through the front and rear sides is formed in the base 321, a rounded corner 323 having an opening facing the inside of the groove 3211 is formed at a position where the bottom surface and the side surface intersect, and the rounded corner 323 can facilitate a worker to clean up debris and impurities on the bottom surface of the groove 3211.

Two hydraulic cylinders 400 are symmetrically arranged in the base 321, one hydraulic cylinder 400 is arranged on the left side of the groove 3211, the other hydraulic cylinder 400 is arranged on the right side of the groove, and the installation directions are all perpendicular to the length direction of the groove 3211. The cylinder 420 is detachably mounted on a side wall of the base 321 by a second fixing bolt 421, the piston rod 410 penetrates out of a side wall of the groove 3211, and the clamping member 322 is connected with the piston rod 410 by a first fixing bolt 411. Because the piston rod 410 and the cylinder body 420 of the hydraulic cylinder 400 are detachably connected with the lower clamp 320, the piston rod and the cylinder body can be detached for repair when a fault occurs.

When clamping a workpiece, the piston rods 410 of the two hydraulic cylinders 400 move in the direction of approaching each other, in order to synchronize the movements of the two hydraulic cylinders 400, the oil inlet pipes 441 and the oil outlet pipes 442 of the two hydraulic cylinders 400 are connected to the same hydraulic system 430 through the same set of oil pipes 440, and the oil inlet pipes 441 and the oil outlet pipes 442 are located outside the base 321. The oil inlet pipe 441 is provided with two output ends and one input end, the left output end of the oil inlet pipe 441 is connected with the left hydraulic cylinder 400, the right output end of the oil inlet pipe 441 is connected with the right hydraulic cylinder 400, and the input end of the oil inlet pipe is connected with the oil pipe 440; the flow line 442 has two inputs and one output, the left input of the flow line 442 being connected to the left hydraulic cylinder 400, the right input being connected to the right hydraulic cylinder 400, and the output being connected to the tubing 440.

Referring to fig. 4, the clamping member 322 is provided with clamping grooves 3221 matching with the shape of the workpiece, and when the performance of the workpiece is tested, the workpiece needs to be placed between the clamping grooves 3221, so that the part of the workpiece at the position of the clamping member 322 is in contact with the clamping member 322, and the stress of the workpiece is more balanced when the workpiece is clamped. The side surfaces opposite to the two clamping grooves 3221 are provided with strip-shaped grooves 3222, the anti-slip pad 330 is clamped with the strip-shaped grooves 3222 to cover the surface of the clamping grooves 3221, the friction force between the anti-slip pad 330 and the workpiece is larger than the friction force between the clamping grooves 3221 and the workpiece, and the friction force can reduce the phenomenon of slippage during workpiece tests.

The clamping piece 322 is further provided with a supporting component which is rod-shaped and is obliquely arranged between the base 321 and the clamping piece 322, the higher end of the supporting component is connected with the base 321 of the lower clamp 320, and the lower end of the supporting component is abutted to the workpiece. The supporting assembly comprises a fixed sleeve 510 and a movable sleeve 520, the fixed sleeve 510 is rotatably connected with the side wall of the groove 3211 through a rotating shaft 511, the movable sleeve 520 is located inside the fixed sleeve 510 and is telescopically sleeved with the fixed sleeve 510, a rubber pad 521 is arranged at the end part of the movable sleeve 520, and the rubber pad 521 which extends to the end part of the movable sleeve 520 is abutted to a clamped workpiece and then fixed through a positioning bolt 530.

The implementation principle of the hydraulic clamp for the universal testing machine in the embodiment of the application is as follows: when a workpiece is subjected to a drawing test, the clamping pieces 322 with the shapes matched with those of the clamping grooves 3221 are selected to be arranged on the base 321, one end of the workpiece is placed between the clamping pieces 322 of the upper clamp 310, the other end of the workpiece is placed between the clamping pieces 322 of the lower clamp 320, the hydraulic system 430 is started, the hydraulic cylinders 400 in the upper clamp 310 and the lower clamp 320 move simultaneously, and the piston rods 410 move in the directions approaching each other until the workpiece is clamped. When the upper clamp 310 slides upwards along the supporting column 200 to pull a workpiece, the workpiece is subjected to horizontal clamping force and vertical upward test force, the supporting force of the workpiece by the supporting component on the lower clamp 320 has a vertical downward component, the phenomenon that the workpiece slides upwards can be reduced, meanwhile, the anti-slip pad 330 is arranged at the position where the clamping piece 322 is in contact with the workpiece, the friction force between the workpiece and the clamping piece 322 is further increased, and the phenomenon that the workpiece slides upwards is reduced. The upper clamp 310 and the lower clamp 320 are symmetrical in direction, and the supporting force of the workpiece by the supporting components of the upper clamp 310 has a vertically upward component, so that the phenomenon that relative sliding occurs between the workpiece and the upper clamp 510 due to excessive testing force can be reduced.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a universal testing machine hydraulic fixture which characterized in that: the hydraulic clamp (300) comprises a base (321) and a clamping piece (322), wherein the base (321) is provided with a groove (3211) which penetrates through two opposite side surfaces of the base (321), two hydraulic cylinders (400) are arranged in the base (321), piston rods (410) of the hydraulic cylinders (400) penetrate out of the opposite side walls of the groove (3211), a piston rod (410) of the hydraulic cylinder (400) is provided with a clamping piece (322), the hydraulic cylinder (400) drives the clamping pieces (322) to move towards the directions close to or away from each other, the two opposite side walls of the groove (3211) are respectively provided with a support component, the support components are rod-shaped and are obliquely arranged on the side walls of the groove (3211), one end of each support component is connected with the side wall of the groove (3211), the other end of each support component is abutted to a detected workpiece, and the support components have component force pointing to the bottom surface of the base (321).

2. The hydraulic clamp for the universal testing machine as claimed in claim 1, wherein: the supporting assembly comprises a fixed sleeve (510) and a movable sleeve (520), the fixed sleeve (510) is rotatably connected with the side wall of the groove (3211), the movable sleeve (520) is telescopically sleeved with the fixed sleeve (510), and a rubber pad (521) is arranged at one end, far away from the fixed sleeve (510), of the movable sleeve (520);

the fixed sleeve (510) and the movable sleeve (520) are fixed through a positioning bolt (530), and the positioning bolt (530) is in threaded connection with the fixed sleeve (510) and is abutted against the movable sleeve (520).

3. The hydraulic clamp for the universal testing machine as claimed in claim 2, wherein: the side walls of the clamping pieces (322) close to each other are provided with clamping grooves (3221) matched with the shape of the workpiece.

4. The hydraulic clamp for the universal testing machine as claimed in claim 3, wherein: mounting holes are formed in the clamping piece (322) and the piston rod (410) of the hydraulic cylinder (400), a first fixing bolt (411) penetrates through the mounting holes, and the clamping piece (322) and the piston rod (410) are connected through the first fixing bolt (411).

5. The hydraulic clamp for the universal testing machine as claimed in claim 4, wherein: the surface of the clamping groove (3221) is provided with an anti-slip pad (330), the surface of the clamping groove (3221) is provided with a strip-shaped groove (3222), and the anti-slip pad (330) is clamped with the strip-shaped groove (3222).

6. The hydraulic clamp for the universal testing machine as claimed in claim 5, wherein: an oil inlet pipe (441) and an oil outlet pipe (442) are arranged on the outer side of the base (321), the oil inlet pipe (441) is provided with an input end and two output ends, the input end of the oil inlet pipe (441) is connected with an oil outlet of a hydraulic system (430), and the two output ends of the oil inlet pipe (441) are respectively connected with two hydraulic cylinders (400);

the oil outlet pipe (442) is provided with two output ends and two input ends, the output end of the oil outlet pipe (442) is connected with an oil return port of the hydraulic system (430), and the two input ends of the oil outlet pipe (442) are respectively connected with the two hydraulic cylinders (400).

7. The hydraulic clamp for the universal testing machine as claimed in claim 6, wherein: the bottom surface of the groove (3211) is provided with a rounded corner (323).

8. The hydraulic clamp for the universal testing machine as claimed in claim 7, wherein: the hydraulic cylinder (400) is detachably connected to the base (321), and the side faces, far away from each other, of the base (321) are connected with the cylinder body (420) of the hydraulic cylinder (400) through a second fixing bolt (421).