A protective device capable of preventing a Hopkinson pressure bar from collapsing and a method of using the same

Abstract

The invention discloses a protection device capable of preventing a Hopkinson pressure rod member from collapsing and a use method thereof, and belongs to the technical field of experimental equipment protection. The pressure rod member comprises two first supports, between which an absorption rod, a transmission rod and an incident rod are arranged in sequence from left to right, fixed pull rods are symmetrically arranged on both sides of the incident rod, and a plurality of protection mechanisms are arranged between the two fixed pull rods, the protection mechanisms comprising an open circular protective cover, both ends of the open circular protective cover are connected with a semi-open fixed cover through a telescopic pull rod, both ends of the telescopic pull rod are respectively connected with the semi-open fixed cover and the open circular protective cover through nuts, and a hinge support is arranged on the outer side of the semi-open fixed cover; the invention is a protection device with a simple structure and convenient operation, which can cleverly restrain the rod member from deviating from the range of the impacted track, thereby ensuring the safety of the test personnel, increasing the safety factor of the experimental device, and effectively preventing the occurrence of safety accidents.

Description

Technical Field

[0001] The present invention relates to the technical field of experimental equipment protection, and specifically to a protection device capable of preventing a Hopkinson pressure bar from collapsing and a use method thereof. Background Art

[0002] There are many problems of explosion vibration or impact load in various fields of scientific research, engineering technology, military technology, etc. The mechanical properties of materials under impact load are extremely complex. Therefore, the dynamic mechanical properties of materials have always been one of the key research directions of scholars. Among them, the Hopkinson pressure bar is considered to be the most commonly used experimental equipment for studying the dynamic mechanical properties of materials under high strain rates.

[0003] The commonly used split Hopkinson pressure bar requires that the incident bar, specimen, transmission bar and absorption bar are in contact with each other, and the end faces of the bars are required to be completely flat. However, during dynamic compression, shear and other experiments, although coupling agents (such as Vaseline and other coupling agents) have been applied to the end faces of the bars to avoid uneven local contact force caused by uneven end faces, it is unavoidable in the actual operation of the experiment that the bar state is extremely unstable due to excessive axial pressure. When the bar is subjected to impact loads, the bar is very likely to deviate from the ideal track, causing the bar to bounce up significantly and collapse, thereby causing safety accidents for laboratory personnel and equipment and property losses.

[0004] In addition, the current protection device of the split Hopkinson pressure bar only applies safety measures at the specimen position to prevent the specimen from impacting, breaking, and splashing, causing safety accidents, but there are obvious deficiencies in the protection against rod collapse. Therefore, in order to ensure the safety of the overall experimental environment, it is extremely necessary to set up corresponding protection devices to protect the rod part to constrain the deviation amplitude and range of the rod. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a protective device and a method for using the Hopkinson pressure bar to prevent the rod from collapsing, so as to prevent the rod from deviating from the impact track and causing damage to the experimental device and the experimental operator.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A protective device capable of preventing a Hopkinson pressure bar from collapsing, the pressure bar comprising a semi-open fixed cover, an open circular protective cover, a telescopic pull rod, and a nut. Two semi-open fixed covers are tightly sleeved on the fixed pull rods on both sides of the Hopkinson pressure bar, the telescopic pull rod is connected to the screw hole of the semi-open fixed cover, the other end of the telescopic pull rod is connected to the open circular protective cover, the height of the protective cover in the horizontal direction can be adjusted by rotating the telescopic pull rod, and the devices are fixed and connected by nuts.

[0008] Furthermore, a hinge support is provided on one side of the semi-open fixed cover, and a nut is used to fix and close the other side, so as to facilitate installation and disassembly.

[0009] Furthermore, the semi-open fixed cover and the open circular protective cover both adopt a double-layer structure, and the order from outside to inside is: high-strength titanium alloy and high-elasticity rubber. The high-elasticity rubber can effectively buffer the force and prevent the titanium alloy shell from damaging the rod.

[0010] Furthermore, the telescopic pull rod adopts a telescopic pull rod in the form of a positioning cap, the exterior of which is made of titanium alloy. During installation, the telescopic length can be adjusted arbitrarily by twisting the positioning cap. The telescopic pull rod is convenient to extend and retract, the overall operation is simple, and the practicability is strong.

[0011] Furthermore, the diameter of the rubber sleeve in the semi-open fixed cover is equal to the diameter of the fixed rod, and the diameter of the rubber sleeve in the open circular protective cover is slightly larger than the diameter of the impacted rod (such as the incident rod, the transmission rod and the absorption rod), so that it can be suspended around the rod under the action of the supporting force.

[0012] A method for using a protective device capable of preventing a Hopkinson pressure bar from collapsing, the method comprising the following steps:

[0013] Step 1: Install the open circular guard on the impacted rod;

[0014] Step 2: Put two semi-open fixed covers tightly on the fixed pull rods on both sides of the Hopkinson pressure rod, with the hinge support facing outwards and the screw holes facing inwards, and connect them to one end of the two telescopic pull rods respectively;

[0015] Step 3: Connect the other ends of the two telescopic pull rods to the screw holes on both sides of the open circular protective cover (7) to form a whole to protect the rods.

[0016] Beneficial effects of the present invention:

[0017] The invention is a protective device with a simple structure and convenient operation, which can cleverly restrain the rod from deviating from the range of the impact track, ensure the safety of the test personnel, increase the safety factor of the experimental device, and effectively prevent the occurrence of safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the protection mechanism in the present invention;

[0021] Figure 3 It is a schematic diagram of the threaded nut connection of the present invention.

[0022] Description of the numbers in the figure:

[0023] 1. Hinge support; 2. Semi-open fixed cover; 3. Nut; 4. Second high elastic rubber sleeve; 5. Telescopic pull rod; 6. Protection mechanism; 7. Open circular protective cover; 8. First high elastic rubber sleeve; 9. First outer shell; 10. Transmission rod; 11. Fixed pull rod; 12. Second support; 13. First support; 14. Absorption rod; 15. Incident rod; 16. Second outer shell. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] A protective device for preventing a Hopkinson pressure bar from collapsing, such as Figure 1-Figure 3As shown, the Hopkinson pressure rod member includes two symmetrically arranged first supports 13, between which an absorption rod 14, a transmission rod 10 and an incident rod 15 are arranged from left to right, and a second support 12 is arranged on the absorption rod 14, the transmission rod 10 and the incident rod 15, and fixed rods 11 are symmetrically arranged on both sides of the incident rod 15, and a plurality of protection mechanisms 6 are arranged between the two fixed rods 11, and the protection mechanism 6 includes an open circular protective cover 7, and the two ends of the open circular protective cover 7 are connected to semi-open fixed rods through telescopic rods 5. The two ends of the telescopic rod 5 are connected to the semi-open fixed cover 2 and the open circular protective cover 7 through nuts 3. The telescopic rod 5 is a positioning cap type rod. When telescoping, the length of the telescopic rod 5 can be adjusted arbitrarily by twisting the positioning cap, which is convenient for operation. A hinge support 1 is provided on the outer side of the semi-open fixed cover 2. The semi-open fixed cover 2 includes a first shell 9. The interior of the first shell 9 is provided with a first high-elastic rubber sleeve 8. The inner wall of the first high-elastic rubber sleeve 8 is fitted with the outer wall of the fixed rod 11. The hinge support 1 can easily open the semi-open fixed cover 2. The fixed cover 2 is sleeved on the fixed rod 11, and the first high elastic rubber sleeve 8 can generate a strong friction force between the fixed rod 11 and the first high elastic rubber sleeve 8 in a closed contact, so that the first high elastic rubber sleeve 8 and the open circular protective cover 7 are connected as a whole, ensuring that the position fixed by the open circular protective cover 7 is not easy to move under the action of external force, and can protect the absorption rod 14, the transmission rod 10 and the incident rod 15. The open circular protective cover 7 includes a second shell 16, and the inner wall of the second shell 16 is provided with a second high elastic The rubber sleeve 4, the diameter of the second high elastic rubber sleeve 4 is larger than the diameters of the incident rod 15, the transmission rod 10 and the absorption rod 14, and the diameter is set to be slightly larger than the diameter of the rod, so that the second high elastic rubber sleeve 4 can be suspended around the rod without contacting the rod, thereby protecting the rod. The first high elastic rubber sleeve 8 and the second high elastic rubber sleeve 4 can effectively buffer the force and prevent the titanium alloy shell from damaging the rod. The material of the first shell 9 and the second shell 16 are both high-strength titanium alloy, which can effectively extend the service life of the protection mechanism 6.

[0027] A method for using a protective device capable of preventing a Hopkinson pressure bar from collapsing comprises the following steps:

[0028] Step 1: Install the open circular protective cover 7 on the impacted rod (such as the incident rod 15, the transmission rod 10, and the absorption rod 14);

[0029] Step 2: Put two semi-open fixed covers 2 tightly on the fixed rods 11 on both sides of the Hopkinson pressure rod, with the hinge support 1 facing outwards and the screw holes facing inwards and connected to one end of the two telescopic rods 5 respectively;

[0030] Step 3: Connect the other ends of the two telescopic pull rods 5 to the screw holes on both sides of the open circular protective cover 7 to form a whole to protect the rods.

[0031] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A protection device for preventing a Hopkinson pressure rod member from collapsing, the pressure rod member comprising two symmetrically arranged first supports (13), an absorption rod (14), a transmission rod (10) and an incident rod (15) being arranged between the first supports (13) from left to right, a second support (12) being arranged on each of the absorption rod (14), the transmission rod (10) and the incident rod (15), and fixed pull rods (11) being symmetrically arranged on both sides of the incident rod (15), characterized in that: A plurality of protection mechanisms (6) are provided between the two fixed pull rods (11); The protective mechanism (6) comprises an open circular protective cover (7), the two ends of the open circular protective cover (7) are connected to a semi-open fixed cover (2) via a telescopic pull rod (5), the two ends of the telescopic pull rod (5) are respectively connected to the semi-open fixed cover (2) and the open circular protective cover (7) via nuts (3), and a hinge support (1) is provided on the outer side of the semi-open fixed cover (2); The semi-open type fixed cover (2) comprises a first outer shell (9), a first high elastic rubber sleeve (8) is provided inside the first outer shell (9), and the inner wall of the first high elastic rubber sleeve (8) is in contact with the outer wall of the fixed pull rod (11); The open circular protective cover (7) comprises a second outer shell (16), the inner wall of the second outer shell (16) is provided with a second high-elasticity rubber sleeve (4), and the diameter of the second high-elasticity rubber sleeve (4) is greater than the diameters of the incident rod (15), the transmission rod (10) and the absorption rod (14).

2. A protection device for preventing a Hopkinson pressure bar from collapsing according to claim 1, characterized in that: The first shell (9) is made of titanium alloy.

3. A protection device for preventing a Hopkinson pressure bar from collapsing according to claim 1, characterized in that: The telescopic pull rod (5) is a positioning cap type pull rod.

4. A method for using the protection device for preventing a Hopkinson pressure bar from collapsing according to any one of claims 1 to 3, characterized in that: The method comprises the following steps: Step 1: Install the open circular protective cover (7) on the impacted rod; Step 2: Two semi-open fixed covers (2) are tightly sleeved on the fixed pull rods (11) on both sides of the Hopkinson pressure rod, with the hinge support (1) facing outwards and the screw holes facing inwards and connected to one end of the two telescopic pull rods (5) respectively; Step 3: Connect the other ends of the two telescopic pull rods (5) to the screw holes on both sides of the open circular protective cover (7) to form a whole to protect the rods.

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