CN113029756B - Hopkinson torsion bar hydraulic clamping and releasing device - Google Patents
Hopkinson torsion bar hydraulic clamping and releasing device Download PDFInfo
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- CN113029756B CN113029756B CN202110332599.9A CN202110332599A CN113029756B CN 113029756 B CN113029756 B CN 113029756B CN 202110332599 A CN202110332599 A CN 202110332599A CN 113029756 B CN113029756 B CN 113029756B
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- G01—MEASURING; TESTING
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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
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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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Abstract
The invention discloses a Hopkinson torsion bar hydraulic clamping and releasing device, belongs to the field of material dynamic mechanical property experimental equipment, and aims to solve the problems that the clamping force of an existing Hopkinson torsion bar clamping and releasing device cannot be accurately controlled, the releasing process is slow, and the repeatability is poor. The scheme of the invention is as follows: the upper sections of the left pressure plate and the right pressure plate are locked by a locking ball mandrel and a locking mechanism, and the middle section clamps the Hopkinson torsion bar; the lower section is clamped by the supporting stud and the end part of the piston rod ball head of the loading hydraulic oil cylinder together; the supporting stud and the loading hydraulic oil cylinder are respectively and symmetrically arranged on two clamping and releasing brackets which are fixed in parallel; the clamping operation is as follows: the ball end part of the locking ball mandrel is locked by a locking mechanism, and then a loading hydraulic oil cylinder is adjusted to clamp Hopkinson torsion bars in the left pressing plate and the right pressing plate; the release operation is as follows: and the locking mechanism is unlocked and released, the left pressing plate drives the unlocked locking ball head mandrel to bounce leftwards together, and then the Hopkinson torsion bar clamped by the left pressing plate and the right pressing plate is released instantly.
Description
Technical Field
The invention relates to a device for loading and releasing torque of an input rod of a Hopkinson torsion bar experiment system, and belongs to the field of material dynamic mechanical property experiment equipment.
Background
The Hopkinson torsion bar device is an effective tool for researching the pure shearing mechanical property of a material under high strain rate, in particular to the thermoplastic shearing localization phenomenon. On the basis of compression, tension and torsion experiments, the stress triaxial degree of the material can be determined, and the fracture and breakage behaviors of the material under the action of dynamic load can be effectively forecasted. In the last 70 th century, t.nicholas et al invented a pre-stored energy type hopkinson torsion bar. The Hopkinson torsion bar is characterized in that a twisted input rod is divided into two sections by a fixed clamping and releasing mechanism, one section is provided with a loading head which can add external moment (load), the loading head rotates by using a jack/hydraulic oil cylinder or other devices so as to apply torque to the rod and pre-store torsional deformation energy on the loading head, and the clamping and releasing mechanism clamps the rod to prevent the rod from rotating; the other section is connected with the loaded test piece. When the pre-stored deformation energy reaches the preset experimental value, the clamping and releasing mechanism instantly releases the rod, and the pre-stored deformation energy (stress and strain) is transmitted to the test piece in a wave form to form a torsion and carrier wave to act on the test piece. The basic requirement for the clamping and release mechanism is that the torsion bar be reliably clamped and released instantaneously when torque is applied.
The clamping and releasing mechanism of the conventional Hopkinson torsion bar mainly comprises two hinged semicircular bridge arms and a slotted bolt, clamping force is applied to an input torsion bar through screwing of the slotted bolt (or adopting a hydraulic cylinder or a jack in the symmetrical direction of the slotted bolt), and when the applied torque reaches an experimental preset value, the slotted bolt is further screwed (or loading of the jack in the other direction) to break the slotted bolt, so that the torsion bar is released instantly. The clamping release mechanism is easy to unscrew the grooving bolt when a clamping force is applied, so that the experiment fails; or the applied clamping force is not enough to overcome the applied torque, and the clamping force is continuously increased (bolts are screwed) in the loading process to prevent the torsion bar from rotating, so that the bolts are frequently suddenly broken in the process, and the experiment fails; on the other hand, the release of the torsion bar is realized by the fracture of the grooving bolt, one grooving bolt is needed to be consumed in each experiment, the cost of the experiment is greatly increased, the grooving bolt has certain randomness in processing and material, and the twisting-off time also has certain randomness, so that the experiment failure is often caused; the repeatability of experimental conditions is seriously influenced, the experimental reliability is low, and the development and the application of the Hopkinson torsion bar are restricted.
Disclosure of Invention
The invention aims to solve the problems that the clamping force of the existing Hopkinson torsion bar clamping and releasing mechanism cannot be accurately controlled, the releasing process is slow, and the repeatability is poor, and provides a Hopkinson torsion bar hydraulic clamping and releasing device.
The invention relates to a Hopkinson torsion bar hydraulic clamping and releasing device which comprises a supporting stud 1, a clamping and releasing support 2, a locking ball head mandrel 4, a nut 5, a left pressing plate 6, a locking mechanism 7, a right pressing plate 8 and a loading hydraulic oil cylinder 9, wherein the clamping and releasing support is fixed on the supporting stud;
the left end of the locking ball head mandrel 4 is provided with an external thread structure, and the right end of the locking ball head mandrel 4 is provided with a ball head structure;
the upper sections of the left pressing plate 6 and the right pressing plate 8 are respectively provided with unthreaded holes at the same positions, the left end of the locking ball head mandrel 4 is in threaded connection with a nut 5 on the left end surface of the left pressing plate 6, the ball head end part of the locking ball head mandrel 4 sequentially penetrates through the unthreaded holes of the left pressing plate 6 and the right pressing plate 8 and is locked by a locking mechanism 7, and the locking mechanism 7 is fixed on the right end surface of the right pressing plate 8;
the middle sections of the left pressure plate 6 and the right pressure plate 8 clamp the Hopkinson torsion bar 3;
the lower sections of the left pressing plate 6 and the right pressing plate 8 are clamped by the supporting stud 1 and the end part of the piston rod ball head of the loading hydraulic oil cylinder 9 together;
the supporting stud 1 and the loading hydraulic oil cylinder 9 are respectively and symmetrically arranged on two clamping and releasing brackets 2 which are fixed in parallel;
the Hopkinson torsion bar clamping operation is as follows: the ball end part of the locking ball mandrel 4 is locked by a locking mechanism 7, and then a loading hydraulic oil cylinder 9 is adjusted to clamp the Hopkinson torsion bar 3 in the left pressing plate 6 and the right pressing plate 8;
the hopkinson torsion bar releasing operation is as follows: the locking mechanism 7 is unlocked and released, the left pressing plate 6 drives the unlocked locking ball head mandrel 4 to bounce leftwards together, and then the Hopkinson torsion bar 3 clamped by the left pressing plate 6 and the right pressing plate 8 is released instantly.
Preferably, the locking mechanism 7 includes an outer sleeve 71, a sliding sleeve 72, a locking sleeve 73, a return spring 74, a locking steel ball 75, and a release drive mechanism;
the outer sleeve 71, the sliding sleeve 72 and the locking sleeve 73 are nested from outside to inside and are in clearance fit, the opening end of the outer sleeve 71 corresponds to the unthreaded hole of the right pressing plate 8 and is fixed on the right end face of the right pressing plate 8, and the bottom of the outer sleeve 71 is provided with a through hole 71-1 for communicating with an external release driving mechanism; a return spring 74 is arranged between the bottom of the sliding sleeve 72 and the bottom of the locking sleeve 73, and an annular groove 72-1 is circumferentially arranged on the inner side wall of the sliding sleeve 72 close to the opening end; a plurality of spherical holes 73-1 are uniformly distributed on the outer side wall of the locking sleeve 73 close to the opening end along the circumferential direction, a locking steel ball 75 is placed in each spherical hole 73-1, the opening caliber of the outer wall of each spherical hole 73-1 is larger than the diameter of the locking steel ball 75, and the opening caliber of the inner wall of each spherical hole 73-1 is smaller than the diameter of the locking steel ball 75;
initial state: under the action of the return spring 74, the opening end of the locking sleeve 73 is pressed against the right pressing plate 8, the bottom of the sliding sleeve 72 is pressed against the outer sleeve 71, and a given gap is formed between the opening end of the sliding sleeve 72 and the right pressing plate 8;
the locking operation process of the locking mechanism 7 on the locking ball head mandrel 4 is as follows: the ball head end of the locking ball head core shaft 4 penetrates into the opening end of the locking sleeve 73 from the unthreaded hole of the right pressing plate 8, the locking sleeve 73 is driven to move rightwards relative to the sliding sleeve 72 by pushing the locking steel ball 75 and the return spring 74 is compressed until the locking steel ball 75 slides into the annular groove 72-1 of the sliding sleeve 72, the ball head end of the locking ball head core shaft 4 continues to move rightwards into the locking sleeve 73, then the locking sleeve 73 pushes the locking sleeve 73 leftwards under the action of the return spring 74, and the locking steel ball 75 slides out of the annular groove 72-1 and locks the ball head end of the locking ball head core shaft 4;
the unlocking and releasing operation process of the locking mechanism 7 on the locking ball head mandrel 4 is as follows: the release driving mechanism provides a driving force to the bottom of the sliding sleeve 72 through the through hole 71-1, the sliding sleeve 72 moves leftwards under the action of the driving force, a given gap between the sliding sleeve 72 and the right pressing plate 8 disappears, the locking steel ball 75 retracts into the annular groove 72-1 of the sliding sleeve 72 under the action of the ball end of the locking ball mandrel 4, and the locking ball mandrel 4 is unlocked and released.
Preferably, the release driving mechanism is realized by using a cylinder or an electromagnet.
Preferably, the depth of the annular groove 72-1 is smaller than the diameter of the locking steel ball 75, and the width of the annular groove 72-1 is 2 to 3 times of the diameter of the locking steel ball 75.
Preferably, the locking ball 75 is pressed by the inner side wall of the opening end of the sliding sleeve 72 and is partially exposed in the locking sleeve 73 in the static state.
Preferably, a base 10 is further included, and the two clamp release brackets 2 are fixed to the base 10 in parallel.
Preferably, the left pressure plate 6 and the right pressure plate 8 are symmetrically provided with arc-shaped grooves with the same diameter for clamping the hopkinson torsion bar 3.
Preferably, the left end of the support stud 1 has an outer hexagonal or inner hexagonal structure for rotating the support stud 1 to adjust the contact degree with the left press plate 6.
Preferably, the hydraulic oil pump of the loading hydraulic oil cylinder 9 is a pump with the maximum pressure of 63 Mpa.
Preferably, the distance between the center of the locking ball head mandrel 4 and the center of the hopkinson torsion bar 3 is L1, the distance between the center of the loading hydraulic oil cylinder 9 and the center of the hopkinson torsion bar 3 is L2, and the two satisfy the following conditions: l2 is greater than L1.
The invention has the beneficial effects that: the Hopkinson torsion bar hydraulic type clamping and releasing device controls the clamping force of the pressure plate by the pressure of hydraulic oil, can provide accurate clamping force according to the torque, can also apply maximum clamping force at one time according to the maximum torque, and the release of the torsion bar is realized by the quick locking mechanism. The device solves the problems that the existing clamping and releasing device is complex in structural design and inconvenient to use, the clamping force and the releasing are not easy to control, the randomness is high, the experiment cost is high, the reliability is poor and the like, realizes the accurate control of the clamping force and the instant releasing of the torque load, ensures the consistency of the experiment, reduces the experiment difficulty and improves the experiment efficiency.
Drawings
FIG. 1 is a schematic structural diagram of a Hopkinson torsion bar hydraulic clamping and releasing device disclosed by the invention;
fig. 2 (a) to (e) are diagrams illustrating locking and releasing processes of the locking ball head mandrel.
Detailed Description
The first embodiment is as follows: the embodiment is described below with reference to fig. 1 and fig. 2, and the hopkinson torsion bar hydraulic clamping and releasing device in the embodiment comprises a support stud 1, a clamping and releasing bracket 2, a locking ball mandrel 4, a nut 5, a left pressure plate 6, a locking mechanism 7, a right pressure plate 8 and a loading hydraulic oil cylinder 9;
the left end of the locking ball head mandrel 4 is provided with an external thread structure, and the right end of the locking ball head mandrel 4 is provided with a ball head structure;
the upper sections of the left pressing plate 6 and the right pressing plate 8 are respectively provided with unthreaded holes at the same positions, the left end of the locking ball head mandrel 4 is in threaded connection with a nut 5 on the left end surface of the left pressing plate 6, the ball head end part of the locking ball head mandrel 4 sequentially penetrates through the unthreaded holes of the left pressing plate 6 and the right pressing plate 8 and is locked by a locking mechanism 7, and the locking mechanism 7 is fixed on the right end surface of the right pressing plate 8;
the middle sections of the left pressure plate 6 and the right pressure plate 8 clamp the Hopkinson torsion bar 3;
the lower sections of the left pressing plate 6 and the right pressing plate 8 are clamped by the supporting stud 1 and the end part of the piston rod ball head of the loading hydraulic oil cylinder 9 together;
the supporting stud 1 and the loading hydraulic oil cylinder 9 are respectively and symmetrically arranged on two clamping and releasing brackets 2 which are fixed in parallel; the two clamp release brackets 2 are fixed in parallel to the base 10.
The Hopkinson torsion bar clamping operation is as follows: the ball end part of the locking ball mandrel 4 is locked by a locking mechanism 7, and then a loading hydraulic oil cylinder 9 is adjusted to clamp the Hopkinson torsion bar 3 in the left pressing plate 6 and the right pressing plate 8;
the Hopkinson torsion bar releasing operation is as follows: the locking mechanism 7 is unlocked and released, the left pressing plate 6 drives the unlocked locking ball head mandrel 4 to bounce leftwards together, and then the Hopkinson torsion bar 3 clamped by the left pressing plate 6 and the right pressing plate 8 is released instantly.
The locking mechanism 7 comprises an outer sleeve 71, a sliding sleeve 72, a locking sleeve 73, a return spring 74, a locking steel ball 75 and a release driving mechanism;
the outer sleeve 71, the sliding sleeve 72 and the locking sleeve 73 are nested from outside to inside and are in clearance fit, the opening end of the outer sleeve 71 corresponds to the unthreaded hole of the right pressing plate 8 and is fixed on the right end face of the right pressing plate 8, and the bottom of the outer sleeve 71 is provided with a through hole 71-1 for communicating with an external release driving mechanism; a return spring 74 is arranged between the bottom of the sliding sleeve 72 and the bottom of the locking sleeve 73, an annular groove 72-1 is circumferentially arranged on the inner side wall of the sliding sleeve 72 close to the opening end, the depth of the annular groove 72-1 is smaller than the diameter of the locking steel ball 75, and the width of the annular groove 72-1 is 2-3 times of the diameter of the locking steel ball 75.
A plurality of spherical holes 73-1 are uniformly distributed on the outer side wall of the locking sleeve 73 close to the opening end along the circumferential direction, a locking steel ball 75 is placed in each spherical hole 73-1, the opening caliber of the outer wall of each spherical hole 73-1 is larger than the diameter of the locking steel ball 75, and the opening caliber of the inner wall of each spherical hole 73-1 is smaller than the diameter of the locking steel ball 75; in a static normal state, the locking steel ball 75 is pressed by the inner side wall of the opening end of the sliding sleeve 72 and is partially exposed in the locking sleeve 73.
Initial state: under the action of the return spring 74, the opening end of the locking sleeve 73 is pressed against the right pressure plate 8, the bottom of the sliding sleeve 72 is pressed against the outer sleeve 71, and a given gap is formed between the opening end of the sliding sleeve 72 and the right pressure plate 8;
the locking operation process of the locking mechanism 7 on the locking ball head mandrel 4 is as follows: the ball head end of the locking ball head core shaft 4 penetrates into the opening end of the locking sleeve 73 from the unthreaded hole of the right pressing plate 8, the locking sleeve 73 is driven to move rightwards relative to the sliding sleeve 72 by pushing the locking steel ball 75 and the return spring 74 is compressed until the locking steel ball 75 slides into the annular groove 72-1 of the sliding sleeve 72, the ball head end of the locking ball head core shaft 4 continues to move rightwards into the locking sleeve 73, then the locking sleeve 73 pushes the locking sleeve 73 leftwards under the action of the return spring 74, and the locking steel ball 75 slides out of the annular groove 72-1 and locks the ball head end of the locking ball head core shaft 4;
the unlocking and releasing operation process of the locking mechanism 7 on the locking ball head mandrel 4 is as follows: the release driving mechanism provides a driving force to the bottom of the sliding sleeve 72 through the through hole 71-1, the sliding sleeve 72 moves leftwards under the action of the driving force, a given gap between the sliding sleeve 72 and the right pressing plate 8 disappears, the locking steel ball 75 retracts into the annular groove 72-1 of the sliding sleeve 72 under the action of the ball end of the locking ball mandrel 4, and the locking ball mandrel 4 is unlocked and released.
The operation is explained with reference to fig. 1 and 2.
Firstly, the left end of the locking ball head core shaft 4 is screwed into the threaded hole of the nut 5 and the left pressing plate 6, the locking ball head core shaft 4 is fixedly connected with the left pressing plate 6 through threads, and then the locking ball head core shaft 4 penetrates through the unthreaded hole of the right pressing plate 8 and extends to the opening end of the locking sleeve 73, namely, the initial state shown in fig. 2 (a).
The hopkinson torsion bar 3 specifically selects an input rod for use, and this embodiment device centre gripping input rod one end is exerted the moment of torsion and is experimented to the input rod other end.
The process of clamping the input rod comprises the following steps: referring to fig. 2 (b) and (c), first, the left pressure plate 6 and the right pressure plate 8 are connected and locked in the locking mechanism 7 by using the locking ball mandrel 4 at the upper end. In the process that the locking ball head mandrel 4 moves from the opening end to the inside of the locking sleeve 73, the locking steel balls 75 can be met and push a plurality of circumferential locking steel balls 75 to the right, the sliding sleeve 72 is driven to move rightwards, and the return spring 74 is compressed, in the process, the locking steel balls 75 can slide into the annular groove 72-1, so that the locking sleeve 73 has no blockage to the locking ball head mandrel 4, the spherical end part of the locking ball head mandrel 4 can reach the bottom of the locking sleeve 73, the locking sleeve 73 outwards pushes the locking sleeve 73 under the action of the return spring 74, and the locking steel balls 75 lock the ball head end part of the locking ball head mandrel 4. And then the lower end of the left pressing plate 6 is supported by a supporting stud 1, and a loading hydraulic oil pump 9 is used for pushing a right pressing plate 8 to move left so as to clamp the input rod.
The process of releasing the input rod is as follows: referring to fig. 2 (d) and (e), a driving force is given to the locking mechanism 7 by the actuating cylinder (or the electromagnet), and the locking mechanism 7 unlocks and releases the locking ball head mandrel 4, so that the loaded torque input rod is quickly released. In other words, in the locked state of the locking mechanism 7, under the action of the force of the execution cylinder or the thrust of the electromagnet, the sliding sleeve 72 moves leftwards, so that a given gap between the sliding sleeve 72 and the right pressing plate 8 disappears, and the locking steel ball 75 partially retracts into the annular groove 72-1 of the sliding sleeve 72 under the action of the pushing and pushing of the ball end of the locking ball mandrel 4, so that the locking ball mandrel 4 is unlocked and released. At the moment, the lower supporting stud 1 and the loading hydraulic oil cylinder 9 on the lower portion press against the lower sections of the two pressing plates, the locking ball head core shaft 4 is unlocked to enable locking force of the upper sections of the two pressing plates to disappear, the two pressing plates can bounce in left and right opposite directions, the left pressing plate 6 drives the locking ball head core shaft 4 to be pulled out of the locking mechanism 7, and quick release operation of the input rod is completed.
The second embodiment is as follows: in the first embodiment, the left pressing plate 6 and the right pressing plate 8 are symmetrically provided with arc-shaped grooves with the same diameter for clamping the hopkinson torsion bar 3.
The present embodiment is provided in such a manner as to increase the contact area with the hopkinson torsion bar 3 and increase the input torque of the hopkinson torsion bar 3.
The third concrete implementation mode: in the first embodiment, the support stud 1 is in threaded connection with the clamping and releasing bracket 2, the right end of the support stud 1 is provided with a ball head, and the left end of the support stud 1 is provided with an outer hexagonal structure or an inner hexagonal structure for rotating the support stud 1 to adjust the contact degree with the left pressure plate 6.
The fourth concrete implementation mode: in the first embodiment, the distance between the center of the locking ball head mandrel 4 and the hopkinson torsion bar 3 is L1, the distance between the center of the loading hydraulic cylinder 9 and the hopkinson torsion bar 3 is L2, and the two satisfy the following conditions: l2 is greater than L1.
The purpose of this embodiment is to reduce the operating pressure and the cylinder size of the hydraulic cylinder.
The fifth concrete implementation mode is as follows: in the first embodiment, the hydraulic oil pump is a pump with a maximum pressure of 63Mpa, so that the loading torque of the input rod can be continuously adjusted.
A specific embodiment is provided: the diameter of an input rod of the torsion bar is 25 mm, the diameter of the locking ball head mandrel is 20 mm, and the guaranteed load is larger than 16 tons. The diameter of the piston of the selected loading hydraulic oil cylinder is 60 mm, and the right pressure plate can be applied with a load of more than 10 tons when the working pressure of the hydraulic pump is 50 Mpa. The selection of L2/L1=1.1 can generate a pressure load of more than 20 tons on the contact surface of the pressure plate and the input rod, and can realize the experimental requirement of the loading capacity of pre-stored torque of more than 400N-m in the rod.
Claims (9)
1. A Hopkinson torsion bar hydraulic clamping and releasing device is characterized by comprising a supporting stud (1), a clamping and releasing support (2), a locking ball head mandrel (4), a nut (5), a left pressing plate (6), a locking mechanism (7), a right pressing plate (8) and a loading hydraulic oil cylinder (9);
the left end of the locking ball head mandrel (4) is provided with an external thread structure, and the right end of the locking ball head mandrel (4) is provided with a ball head structure;
the upper sections of the left pressing plate (6) and the right pressing plate (8) are respectively provided with unthreaded holes at the same positions, the left end of the locking ball head core shaft (4) is in threaded connection with a nut (5) on the left end surface of the left pressing plate (6), the ball head end part of the locking ball head core shaft (4) sequentially penetrates through the unthreaded holes of the left pressing plate (6) and the right pressing plate (8) and is locked by a locking mechanism (7), and the locking mechanism (7) is fixed on the right end surface of the right pressing plate (8);
the middle sections of the left pressure plate (6) and the right pressure plate (8) clamp the Hopkinson torsion bar (3);
the lower sections of the left pressing plate (6) and the right pressing plate (8) are clamped by the supporting stud (1) and the end part of the ball head of a piston rod of a loading hydraulic oil cylinder (9) together;
the supporting stud (1) and the loading hydraulic oil cylinder (9) are respectively and symmetrically arranged on the two clamping and releasing brackets (2) which are fixed in parallel;
the Hopkinson torsion bar clamping operation is as follows: the ball end part of the locking ball mandrel (4) is locked by a locking mechanism (7), and then a loading hydraulic oil cylinder (9) is adjusted to clamp a Hopkinson torsion bar (3) in a left pressing plate (6) and a right pressing plate (8);
the hopkinson torsion bar releasing operation is as follows: the locking mechanism (7) is unlocked and released, the left pressing plate (6) drives the unlocked locking ball head mandrel (4) to bounce leftwards together, and then the Hopkinson torsion bar (3) clamped by the left pressing plate (6) and the right pressing plate (8) is released instantly;
the locking mechanism (7) comprises an outer sleeve (71), a sliding sleeve (72), a locking sleeve (73), a return spring (74), a locking steel ball (75) and a release driving mechanism;
the outer sleeve (71), the sliding sleeve (72) and the locking sleeve (73) are nested from outside to inside and are in clearance fit, the open end of the outer sleeve (71) corresponds to the unthreaded hole of the right pressing plate (8) and is fixed on the right end face of the right pressing plate (8), and the bottom of the outer sleeve (71) is provided with a through hole (71-1) for communicating with an external release driving mechanism; a return spring (74) is arranged between the bottom of the sliding sleeve (72) and the bottom of the locking sleeve (73), and an annular groove (72-1) is formed in the inner side wall, close to the opening end, of the sliding sleeve (72) along the circumferential direction; a plurality of spherical holes (73-1) are uniformly distributed on the outer side wall of the locking sleeve (73) close to the opening end along the circumferential direction, a locking steel ball (75) is placed in each spherical hole (73-1), the opening caliber of the outer wall of each spherical hole (73-1) is larger than the diameter of each locking steel ball (75), and the opening caliber of the inner wall of each spherical hole (73-1) is smaller than the diameter of each locking steel ball (75);
initial state: under the action of a return spring (74), the opening end of a locking sleeve (73) is pressed against the right pressure plate (8), the bottom of a sliding sleeve (72) is pressed against an outer sleeve (71), and a given gap is formed between the opening end of the sliding sleeve (72) and the right pressure plate (8);
the locking operation process of the locking mechanism (7) on the locking ball head mandrel (4) is as follows: the ball head end of the locking ball head mandrel (4) penetrates into the opening end of the locking sleeve (73) from the unthreaded hole of the right pressing plate (8), the locking sleeve (73) is driven to move rightwards relative to the sliding sleeve (72) by pushing the locking steel ball (75) and the return spring (74) is compressed until the locking steel ball (75) slides into the annular groove (72-1) of the sliding sleeve (72), the ball head end of the locking ball head mandrel (4) continues to move rightwards into the locking sleeve (73), then the locking sleeve (73) pushes the locking sleeve (73) leftwards under the action of the return spring (74), and the locking steel ball (75) slides out of the annular groove (72-1) and locks the ball head end of the locking ball head mandrel (4);
the unlocking and releasing operation process of the locking ball head mandrel (4) by the locking mechanism (7) is as follows: the release driving mechanism provides a driving force for the bottom of the sliding sleeve (72) through the through hole (71-1), the sliding sleeve (72) moves leftwards under the action of the driving force, a given gap between the sliding sleeve (72) and the right pressing plate (8) disappears, the locking steel ball (75) retracts into the annular groove (72-1) of the sliding sleeve (72) under the action of the ball head end of the locking ball head mandrel (4), and the locking ball head mandrel (4) is unlocked and released.
2. The hopkinson torsion bar hydraulic clamping release device is characterized in that the release driving mechanism is realized by using an air cylinder or an electromagnet.
3. The hopkinson torsion bar hydraulic clamp release device as claimed in claim 1, wherein the depth of the annular groove (72-1) is smaller than the diameter of the locking steel ball (75), and the width of the annular groove (72-1) is 2 to 3 times of the diameter of the locking steel ball (75).
4. The hopkinson torsion bar hydraulic clamp release device of claim 1, wherein the locking steel ball (75) is pressed by the inner side wall of the open end of the sliding sleeve (72) and is partially exposed in the locking sleeve (73) in a static normal state.
5. The hopkinson torsion bar hydraulic clamp release device according to claim 1, further comprising a base (10), wherein the two clamp release brackets (2) are fixed on the base (10) in parallel.
6. Hopkinson torsion bar hydraulic clamping release device according to claim 1, characterized in that the left pressure plate (6) and the right pressure plate (8) are symmetrically provided with arc-shaped grooves with the same diameter for clamping the Hopkinson torsion bar (3).
7. The hopkinson torsion bar hydraulic clamping release device is characterized in that the left end of the support stud (1) is provided with an outer hexagonal structure or an inner hexagonal structure, and the support stud (1) is used for rotating to adjust the contact degree with the left pressure plate (6).
8. The hopkinson torsion bar hydraulic clamping release device as claimed in claim 1, wherein a hydraulic oil pump for loading the hydraulic oil cylinder (9) is a pump with a maximum pressure of 63 Mpa.
9. The Hopkinson torsion bar hydraulic clamping and releasing device is characterized in that the distance between the center of the locking ball mandrel (4) and the center of the Hopkinson torsion bar (3) is L1, the distance between the center of the loading hydraulic oil cylinder (9) and the center of the Hopkinson torsion bar (3) is L2, and the following conditions are met: l2 is greater than L1.
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| CN202110332599.9A CN113029756B (en) | 2021-03-29 | 2021-03-29 | Hopkinson torsion bar hydraulic clamping and releasing device |
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| CN114112727B (en) * | 2021-11-29 | 2022-09-09 | 哈尔滨瞬态加载试验设备技术开发有限公司 | Single-pulse Hopkinson torsion bar test device |
| CN115452551B (en) * | 2022-08-23 | 2023-07-04 | 中国人民解放军空军工程大学 | Pneumatic Hopkinson torsion bar device and operation method |
| CN116609168B (en) * | 2023-05-18 | 2024-03-08 | 天津大学 | Composite loading device based on Hopkinson bar |
| CN116625848B (en) * | 2023-05-18 | 2024-01-09 | 天津大学 | Composite loading device |
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