CN112944761B

CN112944761B - Finish machining device for cylindrical ice test piece

Info

Publication number: CN112944761B
Application number: CN202110189550.2A
Authority: CN
Inventors: 王春阳; 王庆; 尚祖鑫; 韩端锋
Original assignee: Harbin Engineering University
Current assignee: Harbin Engineering University
Priority date: 2021-02-19
Filing date: 2021-02-19
Publication date: 2022-06-21
Anticipated expiration: 2041-02-19
Also published as: CN112944761A

Abstract

The invention relates to a cylindrical ice test piece finish machining device which comprises a base, a cutter set, a synchronizing rod, a radial synchronizing rod, a locking hinge and a clamp, wherein the cutter set is arranged on the base; the fixture is connected with the base through a thrust bearing, and the cutter set comprises a cutting handle, a radial blade arranged on the cutting handle, a circumferential blade and a cutting blade arranged on the cutting handle; two ends of the synchronous rod are respectively connected with the cutting handle, the cut-off handle, the radial synchronous rod, the thrust bearing and the ratchet wheel; the left end of the base is also provided with a locking screw and an axial spring; the cutting handle cuts off the handle, and the clamp can rotate freely around the same horizontal axis. The invention can provide a high-quality cylindrical and disc-shaped ice test piece which is convenient for a processing person tester to manufacture and has uniform specification, high dimensional precision and no microcrack generated by vibration inside, has the capability of cutting off a rod-shaped ice test piece, and has controllable cross section position, smooth cross section and no burr.

Description

Finish machining device for cylindrical ice test piece

Technical Field

The invention relates to a finish machining device, in particular to a finish machining device for a cylindrical ice test piece.

Background

When uniaxial compression of an ice sample is performed, a cylindrical ice sample of a predetermined size needs to be obtained. Before the microscopic structure observation experiment of the ice sample is carried out, a disc-shaped ice sample with a certain thickness needs to be obtained. However, it is difficult to obtain an ice specimen having a precise size in actual machining operation, and micro cracks are easily generated in the ice specimen by mechanical vibration during machining. There is a need for a finishing device for cylindrical ice specimens that addresses the above problems.

The invention patent with the patent number of CN201710851824.3 and the name of 'a device for preparing ice test pieces' discloses a device for preparing ice test pieces, but an electric saw can only carry out linear cutting and does not have the curved surface processing capacity for processing cylindrical ice test pieces. And when the cutting operation is carried out, the vibration generated by the electric saw is difficult to control, so that microcracks are easily generated in the ice test piece, and the processing quality of the ice test piece is influenced. The invention patent with the patent number of CN201710854651.0 and the name of a test piece sampling device for an ice mechanics test discloses a device for obtaining a cylindrical ice test piece. But the obtained ice test piece has a single size and does not have the chopping function.

Disclosure of Invention

The invention aims to provide a finish machining device for a cylindrical ice test piece, and provides a high-quality cylindrical ice test piece which is convenient for ice sample processing personnel to manufacture and has uniform specification, high dimensional precision and no microcrack generated by vibration inside.

The purpose of the invention is realized by the following steps:

a fine machining device for a cylindrical ice test piece comprises a base, a cutter set, a synchronous rod, a radial synchronous rod, a locking hinge and a clamp; the fixture is connected with the base through a thrust bearing, and the cutter set comprises a cutting handle, a radial blade arranged on the cutting handle, a circumferential blade and a cutting blade arranged on the cutting handle; two ends of the synchronous rod are respectively connected with the cutting handle, the cut-off handle, the radial synchronous rod, the thrust bearing and the ratchet wheel; the left end of the base is also provided with a locking screw and an axial spring; the cutting handle cuts off the handle, and the clamp can rotate freely around the same horizontal axis.

The root of the locking hinge is fixedly connected with the synchronous rod;

the locking hinge is composed of a plurality of hinges, a torque spring is arranged between the hinges, and an anti-slip gasket is pasted on the inner circumference of the locking hinge.

The invention provides a cylindrical ice test piece finish machining device which can be specifically expressed as follows: the device is used for finely machining various rod-shaped ice samples into high-quality cylindrical ice samples with uniform specification, high dimensional accuracy and no microcrack generated by vibration in the interior, and is mainly applied to the field of fine machining of ice.

The method mainly comprises the following steps: base, cutting handle, cut handle, synchronizing bar, locking hinge, anchor clamps and spring. The method is characterized in that: the cutting handle, the cutoff handle, the clamp and the ice test piece can freely rotate around the same horizontal axis. The fixture and the locking hinge jointly control the regular rotation of the ice test piece. An operator controls the circumferential blade, the radial blade and the cutting blade to cut on the surface of the ice test piece by reciprocating the cutting handle and the cutting handle, so that a cylindrical and disc-shaped ice test piece with a specified size or a cut ice test piece is obtained.

The device has the advantages of 80 cm in total length, 35 cm in height and 45 cm in width. The device can fix a rod-shaped ice test piece with the section diameter not more than 20 cm and the length not more than 60 cm, process the rod-shaped ice test piece into a cylindrical ice test piece with the size smaller than the size, and cut the cylindrical ice test piece into a disc-shaped ice test piece with the thickness more than 0.5 cm.

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

1. the invention can provide a high-quality cylindrical and disc-shaped ice test piece which is convenient for a processing person tester to manufacture and has uniform specification, high dimensional precision and no microcrack generated by vibration inside.

2. The device has the capability of cutting off the rod-shaped ice test piece, the position of the cross section is controllable, and the cross section is smooth and has no burrs.

3. Ice samples (ice test pieces with cross-sectional diameter not greater than 20 cm and length not greater than 60 cm) of any size can be obtained as required.

4. With the additional property of security protection. After the ice blocks are installed, experimenters can carry out operations such as ice shaving and cutting by indirectly lifting and pressing the handle, and the danger of directly holding the ice blocks during cutting operation of the bone sawing machine and the chain saw is reduced.

Drawings

FIG. 1 is a top view of the structure of the present invention;

in the figure: 1. the device comprises a base, a cutting handle 2, a cutting handle 3, a truncation handle 4, a circumferential blade 5, a radial blade 6, a synchronizing rod 7, an ice test piece 9, a locking hinge 10, a clamp 11, a cutter set 12, a radial synchronizing rod 13, a horizontal slideway 13, a thrust bearing 16, an axial spring 20, a locking screw 21 and a ratchet 22;

FIG. 2 is a schematic view of the self-locking mechanism (locking hinge) of the present invention;

in the figure: 15. an anti-skid gasket, 17, a locking hinge root, 18, a locking hinge head and 19, a torque spring;

FIG. 3 is a schematic view of the cutoff mechanism of the present invention;

in the figure: 8. a cutting blade, 14. a circumferential knife groove.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, an ice test piece 7 is held in a cavity in the center of a holding jig 10. The right end of the clamp 10 is connected with the base 1 through a bearing, the left end of the clamp utilizes a locking screw 21 at the left end of the base 1 to axially restrain an ice sample, and the clamp 10 can freely rotate 360 degrees around a horizontal axis.

The cutter group 11: the cutting handle 2 and the cutting handle 3 are provided with cutter grooves (such as 14 circumference cutter grooves) which can be used for placing and locking and fixing the circumferential blade and the radial blade. The size of the blade can be adjusted according to the size requirements of the ice sample. The radial blade controls the smoothness of the cross section of the ice sample and the circumferential blade controls the smoothness of the circumferential surface of the sample.

The center and head end of the cutting handle are provided with two constraint holes which are respectively connected with the horizontal slideway 13 and the synchronizing rod 6, the cutting handle 2 is connected with the horizontal slideway 13 through a bearing, and the cutting handle 2 can freely swing around a horizontal axis in a vertical plane with the swing amplitude of 100 degrees. The head end of the cut-off handle is provided with a restriction hole which is connected with the synchronizing rod 6, and the cut-off handle 3 can use the synchronizing rod 6 as a shaft and can swing back and forth in a vertical plane within a swing range of 100 degrees.

The two ends of the synchronous rod 6 are respectively connected with the cutting handle 2, the cutting handle 3, the radial synchronous rod 12, the thrust bearing 16 and the ratchet wheel 22, and when the cutting handle 2 and the cutting handle 3 swing back and forth, the rotating action can be synchronously transmitted to the clamp 10 through the synchronous rod and the radial synchronous rod. However, the radial synchronising lever 12 and the clamp 10 are connected by a ratchet mechanism 22 which does not rotate when the cutting handle 2 is moved downwards and which follows a counter-clockwise rotation (when viewed from left to right) when the cutting handle 2 is lifted upwards.

The cutter group 11 can slide horizontally on the synchronization rod 6 to approach or depart from the jig 10 with respect to the base 1, restricted by the synchronization rod 6, to adjust the relative positions of the cutter group 11 and the ice test piece 7. The axial spring 20 may apply an axial force to the cutter set 11 to make it easier to cut an ice sample.

The locking hinge root 17 is fixed on the synchronous rod 6 and can horizontally slide left and right along the synchronous rod 6.

With reference to fig. 2, the locking hinge is made up of several hinges, the torsion spring 19 at each hinge joint having a tendency to tighten, urging the entire locking hinge plate to a smaller diameter circumference. The anti-skidding gasket 15 is pasted in the inner periphery of the locking hinge, so that the tightening and anti-skidding effects can be achieved, and the surface of the ice sample cannot be damaged.

The dotted lines show the extreme positions of the relaxed state of the locking hinge.

Referring to fig. 3, a circumferential blade 4 and a chopping blade 8 are fixed to the chopping handle 3.

The root of the circumferential blade 4 is fixed with the cutting handle 2 and the truncation handle 3 through a shoe-shaped screw and a cutter groove, and the cutting handle is also provided with a 14 circumferential cutter groove. The peripheral blade 4 and the cutting handle 2 are perpendicular to each other, i.e. the peripheral blade 4 and the synchronization rod 6 are parallel. The above-mentioned circumferential blade 4 can control the radius of the ice sample by adjusting the distance from the cutting handle 2. The cutting edge of the peripheral blade 4 follows the tangential direction of oscillation of the cutting handle 2.

The contact position of the cutting handle 3 and the ice sample is semicircular, the lower end of the semicircular part of the handle is provided with a cutting blade 8, and the cutting handle is pressed down with force to apply shear stress to the ice sample so as to break the ice sample.

The radial blade 5 is fixed to the lower edge of the cutting handle 2, and the cutting edge of the radial blade 5 is parallel to the cutting handle 2.

Example one, finishing cylindrical ice test pieces:

clamping an ice test piece to be processed:

an operator grabs the ice test piece to be processed with the left hand, locks the hinge head part 18 with the right hand, then passes the ice test piece to be processed through the center of the locking hinge 9, puts the ice test piece into a clamp to be clamped, and screws the locking screw at the right end to carry out axial restraint.

Cutting one end of an ice test piece:

the left and right positions of the cutter set 11 are continuously adjusted to enable the radial blade 5 to be close to the left end of the ice test piece 7. The position of the peripheral blade 4 is constantly adjusted so that the peripheral blade 4 approaches the outer wall of the ice test piece 7. The cutting handle is lifted and pressed downwards in a reciprocating mode, at the moment, the left end of the ice test piece 7 can be cut by the radial blade 5, the length of the ice test piece is reduced, the left end face of the ice test piece is flattened, the periphery of the ice test piece 7 can be cut by the circumferential blade 4, the radius of the cross section of the ice test piece 7 is reduced, and the periphery of the ice test piece 7 is closer to the cylindrical surface.

Due to the helical design of the locking hinge 9, and each part is affixed with a slip-resistant gasket 15. When the ice test piece 7 tends to rotate clockwise (from left to right) as it is being cut, the locking hinge 9 will hold the ice test piece 7 against clockwise rotation. When the cutting handle 2 is lifted, the cutting handle 2 drives the radial synchronizing rod 12 to move through the synchronizing rod 6, so that the clamp 10 and the ice test piece 7 rotate counterclockwise by a certain angle (about 90 degrees).

Taking down an ice test piece:

when the end of the ice sample 7 is cut, the clamp is released. The locking hinge head 18 is pulled by the right hand and the ice test piece is removed from the fixture by the left hand.

Then, the ice test piece 7 is turned left and right, the cut part is clamped into the clamp 10, and the steps of clamping the ice test piece to be processed, cutting one end of the ice test piece and taking down the ice test piece are repeated until the cutting is finished.

In example two, a disc-shaped ice specimen was obtained by finish machining.

Firstly, the step of clamping the ice test piece to be processed in the first implementation case is completed.

Cutting off an ice test piece:

the cutter set 11 is adjusted so that both the circumferential blades 4 and the radial blades 5 on the cutting handle 2 are slightly away from the ice coupon 7. The left and right positions of the cutting handle are adjusted. The cut-off handle 3 is pressed down, and the cut-off handle is arranged on one side close to an operator. The cutting handle 2 is held by the left hand and the cutoff handle 3 is held by the right hand. The left hand and the right hand exert force to swing up and down together, and the swing amplitude is larger than the cutting amplitude.

When the two handles move downwards, the cutting blade 8 cuts the ice test piece 7 and cuts a dent on the ice test piece 7; when the two handles are lifted upwards, the chopping blade 3 is lifted on the surface of the ice test piece 7 and does not cut. Meanwhile, the ice test piece 7 is controlled by the synchronizing rod 7 and the radial synchronizing rod 12 to rotate counterclockwise by about 90 degrees.

The cutting handle 2 and the cutoff handle 3 are repeatedly swung up and down until the ice test piece is cut off. Taking down an ice test piece:

the same procedure as the procedure of "removing ice specimen" in "implementation case one". Example three, the ice test pieces were cut off.

The operation steps are completely the same as the second embodiment.

Claims

1. A fine machining device for a cylindrical ice test piece is characterized by comprising a base, a cutter set, a synchronizing rod, a radial synchronizing rod, a locking hinge and a clamp; the clamp is connected with the base through a thrust bearing, and the cutter group comprises a cutting handle, a radial blade arranged on the cutting handle, a truncation handle, a circumferential blade and a truncation blade arranged on the truncation handle; two ends of the synchronous rod are respectively connected with the cutting handle, the cut-off handle, the radial synchronous rod, the thrust bearing and the ratchet wheel; the left end of the base is also provided with a locking screw and an axial spring; the cutting handle cuts off the handle, and the clamp can rotate freely around the same horizontal axis.

2. The finishing device for cylindrical ice specimens according to claim 1, characterized in that the root of the locking hinge is fixedly connected with the synchronizing bar.

3. A cylindrical ice specimen finishing device according to claim 1 or 2, wherein the locking hinges are composed of a plurality of hinges, a torque spring is arranged between the hinges, and an anti-slip gasket is adhered to the inner circumference of the locking hinges.