CN111366485A - Torsion locking and releasing device of Hopkinson torsion bar - Google Patents
Torsion locking and releasing device of Hopkinson torsion bar Download PDFInfo
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- CN111366485A CN111366485A CN202010312393.5A CN202010312393A CN111366485A CN 111366485 A CN111366485 A CN 111366485A CN 202010312393 A CN202010312393 A CN 202010312393A CN 111366485 A CN111366485 A CN 111366485A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/22—Investigating strength properties of solid materials by application of mechanical stress by applying steady torsional forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/001—Impulsive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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Abstract
The invention provides a torsion locking and releasing device of a Hopkinson torsion bar, which adopts a hydraulic or pneumatic linkage mechanism and comprises a cylinder body, a side end cover, a gland, a piston, a plug, a guide sleeve, a friction plate seat, a friction plate and an electromagnetic quick valve, wherein the cylinder body is provided with a left-right circular through hole and a front-back through hole, the axes of the left-right circular through hole and the front-back through hole are intersected, a side cover plate is arranged at the outlet of the left-right circular through hole for sealing, and the gland is arranged at the special-shaped through hole in the front-back direction; the piston, the plug, the guide sleeve, the friction plate seat and the friction plate are arranged in two groups and are symmetrically arranged in the circular through hole in the left and right directions of the cylinder body.
Description
Technical Field
The invention relates to the field of material dynamic mechanical property experimental equipment, in particular to a torsion release device of a Hopkinson torsion bar.
Background
The Hopkinson torsion bar is an experimental device for researching the dynamic shearing performance of materials under the action of impact load, and the sudden release of stored strain energy is one of the common loading modes. The energy storage release method is that the input torsion bar is divided into two sections by a clamp mechanism, wherein one section can be externally added with a twisting moment (called a pre-twisting section), and the other section (the unloaded section) can be prevented from twisting by a clamp; when the clamp is released, the elastic rotational deformation in the pre-twist section can be transmitted to the unloaded section of the incident rod in the form of a torsional pulse. The conventional clamp mainly comprises two hinged semicircular bridge arms and a grooving bolt, clamping force is applied to an input torsion bar through screwing of the grooving bolt, and when the pre-stored energy value in the pre-twisting section reaches the experimental requirement, the clamp is released through screwing off of the grooving bolt. The clamping device is easy to twist off the slotted bolt when clamping force is applied, so that the experiment fails, and on the other hand, when the slotted bolt needs to be twisted off to release the clamp, the twisting-off time is difficult to master, so that the device has high randomness and low experimental efficiency, and the development and application of the split Hopkinson torsion bar are severely restricted.
Disclosure of Invention
The invention aims to overcome the defects that the clamping force of the existing torsion releasing device of the Hopkinson torsion bar can not be accurately regulated and controlled, the releasing process can not be instantly finished, the experiment repeatability is poor and the like, and provides a novel torsion locking and releasing device of a cluster Hopkinson torsion bar so as to meet the requirement of a material dynamic torsion experiment.
In order to solve the technical problem, the invention provides a torsion locking and releasing device of a Hopkinson torsion bar, which adopts a hydraulic or pneumatic linkage mechanism and comprises a cylinder body, a side end cover, a gland, a piston, a plug, a guide sleeve, a friction plate seat, a friction plate and an electromagnetic quick valve, wherein the cylinder body is provided with a left-right circular through hole and a front-back through hole, the axes of the left-right circular through hole and the front-back through hole are intersected, a side cover plate is arranged at the outlet of the left-right circular through hole for sealing, and the gland is arranged at the special-shaped through hole in the front-back direction; the piston, the plug, the guide sleeve, the friction plate seat and the friction plate are arranged in two groups and are symmetrically arranged in the circular through hole in the left and right directions of the cylinder body.
Preferably, the electromagnetic quick valve is fixed on the upper end surface of the cylinder body.
Preferably, the piston is of a cylindrical structure, the cylinder opening faces the outer side of the cylinder body, the outer diameter of the piston is reduced in a stepped mode along the direction from the cylinder opening to the cylinder bottom, and the outer diameter of the cylinder opening of the piston is matched with the inner diameter of the circular through hole of the cylinder body.
Preferably, the inner space of the piston is sealed, the guide sleeve is sleeved on the periphery of the lower section of the piston, and the outer diameter of the guide sleeve is matched with the circular through holes in the left and right directions of the cylinder body.
Preferably, the friction plate seat is connected to the bottom end of the piston through a dovetail structure, the friction plate seat is fixedly connected with a friction plate, the friction plate is provided with a semicircular clamping surface, and the clamping surface of the friction plate is matched with the outer surface of the Hopkinson torsion bar.
Preferably, the piston, the plug, the friction plate seat and the friction plate which are positioned on the same side form a movable whole body which can slide along the circular through hole and the guide sleeve of the cylinder body.
The torsion lock releasing device according to claim 6, wherein a hydraulic chamber is formed between the side end cap and the piston and the plug, a high pressure air chamber is formed in the inner cavity of the piston, and oil and air passages are integrated in the cylinder and are respectively communicated with the hydraulic chamber and the high pressure air chamber.
Preferably, when the hydraulic chambers on the two sides are pressurized, the pistons on the two sides are started to move oppositely, and the Hopkinson incident torsion bar is clamped and locked through the friction plate; when the hydraulic chambers on the two sides are quickly released, the high-pressure gas in the high-pressure gas chamber pushes the piston to move back to the outside quickly, and the Hopkinson incident torsion bar is released.
The invention provides a torsion locking and releasing device of a Hopkinson torsion bar, which has the following beneficial effects:
1. the torsion locking and releasing device provided by the invention consists of a double-side oil cylinder for executing a locking function and a double-side high-pressure air chamber for executing a releasing function, when the oil cylinder is pressurized, pistons at two sides move oppositely to provide accurate positive pressure, and friction force is provided for a friction plate by matching with the oil cylinder, so that the clamping force required by locking a torsion bar can be accurately provided; when the hydraulic chamber is relieved of pressure through the quick pressure relief valve, the high-pressure gas pre-stored in the high-pressure gas chamber pushes the pistons on the two sides to return, and the clamping force is released instantly. The device has the advantages of quick and flexible locking and releasing function conversion, stability, reliability and strong controllability.
2. The device adopts an integrated design for the locking and releasing function and the internal force self-balancing structure, adopts new technologies such as an electromagnetic quick valve and the like, and implements digital program control on each execution module, so that the device has higher automation degree and experimental precision and good reproducibility.
Drawings
Fig. 1 is a structural schematic diagram of a novel torsion locking and releasing device of a Hopkinson torsion bar.
Fig. 2 is a sectional view (locked state) of the novel torsion lock release device of the hopkinson torsion bar.
In the figure: 1. the hydraulic cylinder comprises a cylinder body, 2, a side end cover, 3, a gland, 4, a piston, 5, a plug, 6, a guide sleeve, 7, a friction plate seat, 8, a friction plate, 9, an electromagnetic quick valve, an I hydraulic chamber, an II high-pressure air chamber.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
As shown in fig. 1 and 2, the novel torsion locking and releasing device adopts a hydraulic/pneumatic linkage mechanism, and mainly comprises a cylinder body 1, a side end cover 2, a gland 3, a piston 4, a plug 5, a guide sleeve 6, a friction plate seat 7, a friction plate 8 and an electromagnetic quick valve 9. The cylinder body 1 is provided with a circular through hole in the left-right direction and a special-shaped through hole in the front-back direction, and the axes of the circular through hole and the special-shaped through hole are intersected. Side cover plates 2 are arranged at the outlets of the through holes on the left side and the right side for sealing, and glands 3 are arranged at the special-shaped through holes on the front side and the rear side; the piston 4, the plug 5, the guide sleeve 6, the friction plate seat 7 and the friction plate 8 are respectively arranged in two groups and are symmetrically arranged in circular through holes in the left and right directions of the cylinder body 1; the electromagnetic quick valve 9 is fixed on the upper end surface of the cylinder body 1.
The piston 4 is of a cylindrical structure, the cylinder opening faces the outer side of the cylinder body 1, the outer diameter of the piston 4 is reduced along the direction from the cylinder opening to the cylinder bottom in a stepped mode, and the outer diameter of the cylinder opening is matched with the inner diameter of the circular through hole of the cylinder body 1 in service. The plug 5 is fixed at the position of the cylinder opening of the piston 4 and seals the inner space of the piston 4; the guide sleeve 6 is sleeved on the periphery of the lower section of the piston 4, and the outer diameter of the guide sleeve is matched with the circular through holes in the left and right directions of the cylinder body 1; the friction plate seat 7 can be connected to the bottom end of the piston 4 through a dovetail structure; the friction plate seat 7 is fixedly connected with a friction plate 8; the friction plate 8 has a semicircular clamping surface and is matched with the outer diameter of the Hopkinson torsion bar.
The piston 4, the plug 5, the friction plate seat 7 and the friction plate 8 on the same side form a movable whole which can slide along the circular through hole of the cylinder body 1 and the guide sleeve 6.
A hydraulic chamber I is formed between the side end cover 2 and the piston 4 and between the side end cover and the plug 5; a high-pressure air chamber II is formed in the inner cavity of the piston 4; an oil passage and an air passage are integrated in the cylinder body 1 and are respectively communicated with the hydraulic chamber I and the high-pressure air chamber II.
The pressure in the hydraulic chamber I and the pressure in the high-pressure air chamber II are digitally programmed through the electromagnetic quick valve 9.
After the experimental work is ready, the hydraulic chambers of the pistons on the two sides are pressurized (at the moment, preset high-pressure gas can be synchronously filled into the high-pressure gas chamber), so that the pistons on the two sides move oppositely, and the incident torsion bar is clamped and locked through the friction plate. Then starting a torque motor to carry out rotary loading, driving the torsion section of the incident torsion bar to rotate through a coupler, and storing elastic rotary deformation energy (measured by rotary radian) in the torsion section. When the energy storage value reaches the experimental requirement, the hydraulic chambers of the pistons on the two sides are quickly released, at the moment, the high-pressure gas in the high-pressure gas chamber pushes the piston to move back to the high speed, the incident torsion section is released instantly, the elastic strain energy stored in the torsion section is transmitted to the unloaded section of the incident torsion bar in the form of torsion pulses, and the test piece is subjected to shear loading, so that the dynamic shear stress strain relation of the tested material can be obtained.
The above is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A torsion locking and releasing device of a Hopkinson torsion bar is characterized in that a hydraulic or pneumatic linkage mechanism is adopted by the torsion locking and releasing device, the torsion locking and releasing device comprises a cylinder body, a side end cover, a pressing cover, a piston, a plug, a guide sleeve, a friction plate seat, a friction plate and an electromagnetic quick valve, the cylinder body is provided with a left-right circular through hole and a front-back through hole, the axes of the left-right circular through hole and the front-back through hole are intersected, a side cover plate is arranged at the outlet of the left-right circular through hole for sealing, and the pressing cover is arranged at the special-shaped through hole in; the piston, the plug, the guide sleeve, the friction plate seat and the friction plate are arranged in two groups and are symmetrically arranged in the circular through hole in the left and right directions of the cylinder body.
2. The torsion lock release device according to claim 1, wherein the electromagnetic quick valve is fixed to an upper end surface of the cylinder.
3. The torsion lock release device according to claim 1, wherein the piston has a cylindrical structure, the cylinder opening faces the outside of the cylinder, the outer diameter of the piston is reduced in a stepwise manner along the direction from the cylinder opening to the cylinder bottom, and the outer diameter of the cylinder opening of the piston is matched with the inner diameter of the circular through hole of the cylinder.
4. The torque lock release device according to claim 3, wherein the plug is fixed at the opening of the piston to seal the inner space of the piston, the guide sleeve is sleeved on the periphery of the lower section of the piston, and the outer diameter of the guide sleeve is matched with the circular through hole in the left-right direction of the cylinder body.
5. The torsion lock release device according to claim 4, wherein the friction plate holder is connected to the bottom end of the piston through a dovetail structure, and a friction plate is fixedly connected to the friction plate holder, and the friction plate has a semicircular clamping surface, and the clamping surface of the friction plate is matched with the outer surface of the Hopkinson torsion bar.
6. The torsion lock release device according to claim 1, wherein the piston, the plug, the friction plate holder and the friction plate on the same side form a movable unit capable of sliding along the circular through hole of the cylinder and the guide sleeve.
7. The torsion lock releasing device according to claim 6, wherein a hydraulic chamber is formed between the side end cap and the piston and the plug, a high pressure air chamber is formed in the inner cavity of the piston, and oil and air passages are integrated in the cylinder and are respectively communicated with the hydraulic chamber and the high pressure air chamber.
8. The torsion lock release device according to claim 7, wherein when the hydraulic chambers on both sides are pressurized, the pistons on both sides are actuated to move toward each other, and the hopkinson incident torsion bar is clamped and locked by the friction plates; when the hydraulic chambers on the two sides are quickly released, the high-pressure gas in the high-pressure gas chamber pushes the piston to move back to the outside quickly, and the Hopkinson incident torsion bar is released.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010312393.5A CN111366485A (en) | 2020-04-20 | 2020-04-20 | Torsion locking and releasing device of Hopkinson torsion bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010312393.5A CN111366485A (en) | 2020-04-20 | 2020-04-20 | Torsion locking and releasing device of Hopkinson torsion bar |
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| Publication Number | Publication Date |
|---|---|
| CN111366485A true CN111366485A (en) | 2020-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010312393.5A Pending CN111366485A (en) | 2020-04-20 | 2020-04-20 | Torsion locking and releasing device of Hopkinson torsion bar |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112834327A (en) * | 2021-02-03 | 2021-05-25 | 哈尔滨瞬态加载试验设备技术开发有限公司 | Hopkinson torsion bar hydraulic clamping and releasing device |
| CN114965117A (en) * | 2022-05-06 | 2022-08-30 | 天津大学 | Dynamic friction experimental device and method for testing dynamic mechanical property of material |
| CN116609168A (en) * | 2023-05-18 | 2023-08-18 | 天津大学 | Composite loading device based on Hopkinson bar |
-
2020
- 2020-04-20 CN CN202010312393.5A patent/CN111366485A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112834327A (en) * | 2021-02-03 | 2021-05-25 | 哈尔滨瞬态加载试验设备技术开发有限公司 | Hopkinson torsion bar hydraulic clamping and releasing device |
| CN112834327B (en) * | 2021-02-03 | 2022-07-12 | 哈尔滨瞬态加载试验设备技术开发有限公司 | Hopkinson torsion bar hydraulic clamping and releasing device |
| CN114965117A (en) * | 2022-05-06 | 2022-08-30 | 天津大学 | Dynamic friction experimental device and method for testing dynamic mechanical property of material |
| CN116609168A (en) * | 2023-05-18 | 2023-08-18 | 天津大学 | Composite loading device based on Hopkinson bar |
| CN116609168B (en) * | 2023-05-18 | 2024-03-08 | 天津大学 | Composite loading device based on Hopkinson bar |
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