A system for measuring friction sensitivity of energetic materials

Abstract

The present invention discloses a system for measuring the friction sensitivity of energetic materials, comprising a frame, a test structure disposed on the frame and capable of clamping a test piece, and a striking structure disposed above the test structure and used to apply a striking force to the test piece. A striking rod capable of aligning with the test piece and being transmission-connected to the striking structure is slidably disposed on the test structure. The beneficial effects of the present invention are as follows: the present solution utilizes the sliding movement of the striking rod to apply a striking force to the test piece, and can effectively control the movement accuracy of the striking rod, thereby ensuring the relative position accuracy of the striking rod and the test piece, avoiding deviations in the relative position of the striking rod and the test piece that affect the accuracy of the test; the striking rod is not directly connected to the drive structure, and can reduce the impact of vibrations generated by the drive structure itself on the accuracy of the test.

Description

Technical Field

[0001] The present invention relates to the technical field of friction sensitivity testing, in particular to a system for measuring the friction sensitivity of energetic materials. Background Art

[0002] Sensitivity is the ability of an explosive material to undergo explosive changes in response to external energy. Explosive materials generally refer to dynamite and other chemical substances with similar explosive properties. The minimum energy required to cause an explosive change is called the excitation impulse. The smaller the excitation impulse required to cause an explosive change, the more sensitive the explosive is and the greater its sensitivity. Friction sensitivity testing is necessary before processing or transporting energetic materials such as explosives.

[0003] Under current technology, BAM tribometers are commonly used for testing. These instruments utilize a lever to apply constant pressure to the test material. However, due to the flexible connection of the pressure-applying component, the stability of the component itself is poor, making it difficult to maintain constant pressure on the test material. This is especially true at the moment of impact, leading to inaccurate test results. The structure that applies the impact force to the test material is connected to a motor, and the motor's vibration and force direction can also affect test accuracy. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the present invention aims to provide a system for measuring the friction sensitivity of energetic materials, which is used to improve the directional accuracy of the striking force and ensure the accuracy of the experiment.

[0005] The present invention is achieved through the following technical solution: a system for measuring the friction sensitivity of energetic materials, comprising a frame, a test structure arranged on the frame and capable of clamping a test piece, and a striking structure arranged above the test structure and used to apply a striking force to the test piece, wherein a striking rod is slidably arranged on the test structure and can be aligned with the test piece and is transmission-connected to the striking structure.

[0006] Furthermore, in order to better realize the present invention, the test structure includes an instrument body arranged in a frame and having a through hole, an upper push column arranged at one end of the through hole, and a punch slidably arranged at the other end of the through hole and capable of clamping the test piece with the upper push column. An opening connected to the through hole is provided on the side of the instrument body, the striking rod is aligned with the opening on the instrument body, and a driving structure for driving the punch to move is provided on the frame.

[0007] Furthermore, in order to better implement the present invention, a test base plate is provided in the rack, a number of test pillars are provided on the test base plate, a test top plate is provided on the test pillars, the instrument body is installed on the lower surface of the test top plate through a flange, and the upper top column is provided on the lower surface of the flange.

[0008] Furthermore, in order to better realize the present invention, a bracket is provided in the instrument body, and a stepped through hole with a small hole facing upward is provided in the bracket, one end of the punch is installed in cooperation with the small hole of the stepped through hole, the large hole of the stepped through hole is connected to the bracket nut by a thread, one end of the punch passes through the bracket nut, a shoulder is provided on the punch, and a spring is provided in the large hole of the stepped through hole that is sleeved on the punch; a guide sleeve is provided between the bracket and the upper push column, and a through hole is provided in the guide sleeve that is installed in cooperation with the experimental piece, and the end of the instrument body away from the upper push column is connected to the body nut for limiting the bracket.

[0009] Furthermore, in order to better realize the present invention, a limit pin is provided at one end of the instrument body close to the body nut, and a bracket limit groove is provided on the bracket to be installed in cooperation with the limit pin. The bracket is slidably arranged in the instrument body, and a locking structure capable of locking the guide sleeve is provided on the test base plate.

[0010] Furthermore, in order to better realize the present invention, the driving structure includes a pressure head, a positioning shaft, a guide head, a pressure sensor, a pressure head connector, a transition head and an electric cylinder shaft of the electric cylinder, which are connected in sequence from top to bottom.

[0011] Furthermore, in order to better realize the present invention, a driving structure support plate is provided on the frame, a number of driving structure pillars are provided on the driving structure support plate, a driving structure flat plate is provided on the driving structure pillar, and a driving guide sleeve is provided on the driving structure flat plate that is slidingly connected to the positioning shaft; the positioning shaft and the guide head are connected through a spherical surface.

[0012] Furthermore, in order to better realize the present invention, the striking structure includes a striking pillar arranged on the frame, a striking support plate arranged on the striking pillar, a pendulum arm rotatably arranged on the striking support plate, and a pendulum arranged at the free end of the pendulum arm.

[0013] Furthermore, in order to better realize the present invention, a pendulum bracket is provided on the striking support plate, a ratchet with ratchet teeth and a sear used in conjunction with the ratchet teeth are rotatably provided on the pendulum bracket, and the pendulum arm is transmission connected to the ratchet; a sear shaft whose axis is parallel to the axis of the ratchet is provided on the pendulum bracket, the sear is rotatably provided on the sear shaft, and a sear spring connected between the sear and the pendulum bracket is mounted on the sear shaft; a sear cylinder transmission connected to the sear is provided on the pendulum bracket.

[0014] Furthermore, in order to better realize the present invention, a shift rod is rotatably provided on the striking support plate, the free end of the shift rod is transmission-connected to the pendulum arm, and the free end of the shift rod is provided with a follower cam rollingly connected to the pendulum arm; a striking motor is provided on the striking support plate, and a reducer is connected between the striking motor and the shift rod.

[0015] The beneficial effects achieved by this scheme are: this scheme utilizes the sliding of the striking rod to apply striking force to the experimental piece, which can effectively control the movement accuracy of the striking rod, thereby ensuring the relative position accuracy of the striking rod and the experimental piece, avoiding the deviation of the relative position of the striking rod and the experimental piece and affecting the accuracy of the test. The striking rod has no direct connection to the drive structure, which can reduce the impact of the vibration generated by the drive structure itself on the experimental accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of the measurement system;

[0017] Figure 2 is a three-dimensional schematic diagram of the test structure;

[0018] Figure 3 is a cross-sectional schematic diagram of the test structure;

[0019] Figure 4 Schematic diagram of the internal structure of the instrument body;

[0020] Figure 5 Schematic diagram of the internal structure of the instrument body;

[0021] Figure 6 It is a structural diagram of the driving structure;

[0022] Figure 7 It is a schematic diagram of the local structure of the driving structure;

[0023] Figure 8 It is a three-dimensional schematic diagram of the striking structure;

[0024] Figure 9 It is a top view of the striking structure;

[0025] Figure 10 Schematic diagram of the position of the lever;

[0026] Figure 11 for Figure 9 A magnified view of point A;

[0027] Among them, 1-frame, 2-drive structure, 21-drive structure support plate, 22-electric cylinder, 23-electric cylinder shaft, 24-drive structure pillar, 25-drive structure plate, 26-pressure head, 27-drive guide sleeve, 28-positioning shaft, 29-guide head, 210-pressure sensor, 211-pressure head connector, 212-transition head, 3-test structure, 31-test bottom plate, 32-test pillar, 33-test top plate, 34-flange, 35-upper pillar, 36-top rod, 37-support rod, 38-transmission block, 39-support rod cylinder, 391-cylinder slide, 392-cylinder slide, 310-, 311-instrument cover, 312-instrument body, 3121-limit pin, 313-separator cup, 313 1-long through hole, 314-guide sleeve, 315-bracket, 3151-bracket limiting groove, 316-spring, 317-punch, 318-body nut, 319-bracket nut, 320-rotating shaft, 321-bearing, 322-strike rod, 323-strike rod mounting seat, 324-separator hook, 4-striking structure, 41-striking support plate, 42-strike motor, 43-reducer, 45-striking pillar, 46-, 47-ratchet, 471-ratchet teeth, 48-pendulum arm, 49-pendulum, 410-brake cylinder, 411-sealer cylinder, 412-sealer, 413-pendulum bracket, 414-shift lever, 415-sealer shaft, 416-sealer spring, 417-follow-up cam, 5-experimental piece. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the examples, but the embodiments of the present invention are not limited thereto.

[0029] Example 1:

[0030] like Figure 1 As shown, in this embodiment, a system for measuring the friction sensitivity of energetic materials includes a frame 1, a test structure 3 arranged on the frame 1 and capable of clamping a test piece 5, and a striking structure 4 arranged above the test structure 3 and used for applying a striking force to the test piece 5. A striking rod 322 is slidably provided on the test structure 3 and can be aligned with the test piece 5 and is transmission-connected to the striking structure 4.

[0031] When the test piece 5 needs to be tested, the test piece 5 is clamped by the test mechanism 3 so that the test piece 5 is subjected to constant pressure. The striking force is applied to the striking rod 322 through the striking structure 4 so that the striking rod 322 hits the test piece 5. Sliding friction occurs between the test piece 5 and the test mechanism 3. The explosion probability of the test piece 5 is observed to characterize the friction sensitivity of the test piece 5.

[0032] By controlling the moving direction of the striking rod 322, the relative position accuracy of the striking rod 322 and the experimental piece 5 and the force direction of the experimental piece 5 can be controlled, and when multiple experiments are conducted, the relative position accuracy of the striking rod 322 and the experimental piece 5 can be kept consistent, even if the force direction of the experimental piece 5 is always consistent, thereby avoiding the deviation of the relative position of the striking rod 322 and the experimental piece 5 and affecting the accuracy of the experiment, eliminating the experimental error caused by the different force directions of the experimental piece 5 during multiple experiments due to the vibration of the striking structure 4 itself, and improving the accuracy of the experiment.

[0033] In this embodiment, the test structure 3 includes a striking rod mounting seat 323 , and the striking rod 322 is slidably disposed in the striking rod mounting seat 323 .

[0034] Example 2:

[0035] like Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 As shown, on the basis of the above embodiment, in this embodiment, the test structure 3 includes an instrument body 312 arranged in the frame 1 and having a through hole, an upper push column 35 arranged at one end of the through hole and a punch 317 slidably arranged at the other end of the through hole and capable of clamping the test piece 5 with the upper push column 35, an opening connected to the through hole is provided on the side of the instrument body 312, the striking rod 322 is aligned with the opening on the instrument body 312, and a driving structure 2 for driving the punch 317 to move is provided on the frame 1.

[0036] The upper support column 35 and the punch 317 clamp the test piece 5, keeping it fixed during testing. The instrument body 312 can relatively isolate the test piece 5 from the surrounding environment, allowing it to enter and exit only through the opening. If the test piece 5 is impacted and released, it can be confined within the instrument body 312, preventing it from colliding with other structures and posing the risk of combustion or explosion. Moreover, if the test piece 5 burns or explodes due to the impact force, the combustion or explosion can be isolated to a certain extent, and the impact force generated by the combustion or explosion can be released through the opening, reducing the impact of the combustion or explosion on surrounding equipment and personnel.

[0037] like Figure 2 、 Figure 3 As shown, a test base plate 31 is provided in the rack 1, a number of test pillars 32 are provided on the test base plate 31, a test top plate 33 is provided on the test pillars 32, the instrument body 312 is installed on the lower surface of the test top plate 33 through a flange 34, and the upper top column 35 is provided on the lower surface of the flange 34.

[0038] The striker mounting seat 323 is mounted on the lower surface of the test top plate 33 .

[0039] By installing the upper push column 35 on the lower surface of the flange 34, using the flange 34 to support and limit the upper push column 35 to improve its stability, and using the driving structure 2 to support and limit the punch 317, the relative position accuracy of the upper push column 35 and the punch 317 as the clamping structure can be controlled, avoiding external force factors that cause the relative position of the upper push column 35 and the punch 317 to change, thereby preventing the clamping force borne by the test piece 5 from changing, thereby helping to improve the accuracy of the test.

[0040] Example 3:

[0041] like Figure 4 、 Figure 5 As shown, on the basis of the above embodiment, in this embodiment, a bracket 315 is provided in the instrument body 312, and a stepped through hole with a small hole facing upward is provided in the bracket 315, one end of the punch 317 is installed in cooperation with the small hole of the stepped through hole, and the large hole of the stepped through hole is connected to the bracket nut 319 by a thread, one end of the punch 317 passes through the bracket nut 319, and a shoulder is provided on the punch 317, and a spring 316 mounted on the punch 317 is provided in the large hole of the stepped through hole.

[0042] The punch 317 is installed in conjunction with the small hole of the stepped through hole, which can guide and limit the punch 317, control the moving direction of the punch 317, and prevent the punch 317 from moving or shaking at will and affecting the stability of the test piece 5.

[0043] The bracket nut 319 can support and limit the shoulder on the punch 317, and can limit the extreme position of the punch 317 to fall back, preventing the punch 317 from escaping and falling from the bracket 315.

[0044] In this embodiment, the end of the punch 317 close to the experimental piece 5 is designed as a stepped shaft, and the small shaft of the stepped shaft is installed in conjunction with the small hole of the stepped through hole, and the small hole of the stepped through hole is used to limit the large shaft of the stepped shaft, thereby limiting the extreme position of the upward movement of the punch 317.

[0045] In this embodiment, a guide sleeve 314 is provided between the bracket 315 and the upper support column 35 , and a through hole for fitting with the experimental piece 5 is provided in the guide sleeve 314 .

[0046] The guide sleeve 314 is used to limit and guide the movement of the experimental piece 5 and the punch 317, thereby improving the movement accuracy of the experimental piece 5 and the punch 317, improving the relative position accuracy of the punch 317 and the upper push column 35, and preventing the experimental piece 5 from loosening or falling.

[0047] The guide sleeve 314 is provided separately, and guide sleeves 314 of different thicknesses can be selected according to the different sizes of the experimental pieces 5. When ensuring that the guide sleeve 314 works, the guide sleeve 314 is prevented from interfering with the normal progress of the experiment.

[0048] In this embodiment, the end of the instrument body 312 away from the upper pillar 35 is connected to a body nut 318 for limiting the bracket 315. The body nut 318 is used to facilitate opening or closing the interior space of the instrument body 312, thereby facilitating assembly, disassembly, cleaning, etc.

[0049] Example 4:

[0050] Based on the above embodiment, in this embodiment, a limit pin 3121 is provided at one end of the instrument body 312 close to the body nut 318, and a bracket limit groove 3151 is provided on the bracket 315 to be installed in cooperation with the limit pin 3121. The bracket 315 is slidably set in the instrument body 312, and a locking structure capable of locking the guide sleeve 314 is provided on the test base plate 31.

[0051] By slidably disposing the bracket 315 within the instrument body 312, the height of the bracket 315 can be adaptively adjusted when the punch 317 is subjected to pressure, thereby shortening the stroke of the punch 317 and thereby shortening the length of the punch 317, thereby enhancing the rigidity of the punch 317. The stop pin 3121 cooperates with the stop slot 3151 to guide and limit the bracket 315, restricting its rotational freedom and improving its movement accuracy. This prevents the rotation of the bracket 315 from causing shaking of the experimental piece 5, which could affect the positional accuracy and stability of the experimental piece 5.

[0052] Using the locking structure to lock the guide sleeve 314 is beneficial to improving the relative position accuracy of the guide sleeve 314 and the punch 317, allowing the punch 317 to smoothly pass through the guide sleeve 314 to apply pressure to the experimental piece 5, and improving the stability of the guide sleeve 314 to prevent the guide sleeve 314 from loosening and affecting the experimental accuracy.

[0053] In this embodiment, the locking structure includes a separator cup 313 mounted on the outside of the instrument body 312, a support rod bracket 310 arranged on the test base plate 31, and a support rod 37 hinged to the support rod bracket 310. The side of the separator cup 313 is provided with a long through hole 3131 arranged along the axial direction of the separator cup 313, and a rotating shaft 320 hinged to the support rod 37 is slidingly provided in the long through hole 3131. An L-shaped separator hook 324 is provided in the instrument body 312 and is buckled on the upper surface of the guide sleeve 314. The separator hook 324 is hinged to the rotating shaft 320.

[0054] By pushing the end of the support rod 37 away from the instrument body 312 upward, the end of the support rod 37 closer to the instrument body 312 will move downward, driving the separator hook 324 downward. The separator hook 324 is used to fasten the guide sleeve 314, thereby locking the guide sleeve 314. The long through hole 3131 leaves sufficient space for the movement of the rotating shaft 320.

[0055] In this embodiment, the end of the support rod 37 near the instrument body 312 is semi-annular. The separator cup 313 is symmetrically provided with two elongated through-holes 3131 and two rotating shafts 320. The two ends of the semi-annular support rod 37 are respectively hinged to a rotating shaft 320. Two separator hooks 324 are symmetrically provided within the instrument body 312. This allows the two separator hooks 324 to simultaneously engage the guide sleeve 314, thereby enhancing the locking effect of the guide sleeve 314.

[0056] A bearing 321 is provided between the rotating shaft 320 and the support rod 37. The bearing 321 is used to reduce friction and wear between the rotating shaft 320 and the support rod 37.

[0057] In this embodiment, the outer surface of the instrument body 312 is covered with an instrument cover 311 , and the instrument cover 311 , the instrument body 312 and the separator cup 313 are combined to form a complete cylindrical shape.

[0058] One end of the support rod 37 away from the instrument body 312 is hinged with a transmission block 38, and a support rod cylinder 39 is slidably provided on the test base plate 31 and is transmission-connected to the transmission block 38. The movement of the support rod 37 is controlled by the movement of the piston rod of the texture cylinder 39.

[0059] In this embodiment, the test base plate 31 is provided with a cylinder slide groove 391 and a cylinder slider 392 slidingly set in the cylinder slide groove 391. The support rod cylinder 39 is connected to the cylinder slider 392. The length direction of the cylinder slide groove 391 is perpendicular to the rotation center of the support rod 37 relative to the support rod bracket 310.

[0060] In this embodiment, the instrument body 312 is provided with a push rod sleeve that is connected to the instrument body 312. A push rod 36 is slidably disposed within the push rod sleeve and aligned with the opening of the instrument body 312. When the experiment is completed, the push rod 36 can be used to eject the experimental piece 5 from the instrument body 312 to facilitate removal of the experimental piece 5.

[0061] In this embodiment, a push rod spring sleeved on the push rod 36 is provided in the push rod sleeve. After the push rod 36 pushes the experimental piece 5 away from the instrument body 312, the push rod 36 is reset under the action of the push rod spring.

[0062] Example 5:

[0063] like Figure 6 、 Figure 7 As shown, based on the above embodiment, in this embodiment, the driving structure 2 includes a pressure head 26, a positioning shaft 28, a guide head 29, a pressure sensor 210, a pressure head connector 211, a transition head 212 and an electric cylinder shaft 23 of the electric cylinder 22 connected in sequence from top to bottom.

[0064] The expansion and contraction of the electric cylinder shaft 23 drives the pressure head 26 to move back and forth, thereby pushing the punch 317 or fixing the punch 317 to make the test piece bear a constant pressure. The pressure sensor 210 can detect the pressure output by the electric cylinder shaft 23.

[0065] In this embodiment, the electric cylinder 22 is connected to a motor, and the motor is connected to a controller. The controller can realize remote automatic control. The controller is connected to the pressure sensor 210. The pressure sensor 210 can transmit the detected pressure data to the controller for processing. The controller controls the power output by the motor according to the received pressure data, thereby controlling the action of the electric cylinder 22 and the output pressure.

[0066] In this embodiment, a drive structure support plate 21 is provided on the frame 1, a plurality of drive structure pillars 24 are provided on the drive structure support plate 21, a drive structure flat plate 25 is provided on the drive structure pillars 24, and a drive guide sleeve 27 that is slidably connected to the positioning shaft 28 is provided on the drive structure flat plate 25.

[0067] The driving guide sleeve 27 can limit and guide the positioning shaft 28, thereby controlling the movement accuracy of the positioning shaft 28 and facilitating the alignment of the pressure head 26 with the punch 317. It can also reduce the shaking of the positioning shaft 28 and the vibration of the punch 317, which is conducive to ensuring the accuracy of the experiment.

[0068] In this embodiment, the positioning shaft 28 and the guide head 29 are connected through a spherical surface. When the guide head 29 transmits power to the positioning shaft 28, it can adaptively adjust the direction of force transmission, thereby controlling the position accuracy of the thrust output by the positioning shaft 28, and can amplify the tolerance of the different axialities of each part in the driving structure 2, which is beneficial to reducing the production cost and processing difficulty of each part.

[0069] Example 6:

[0070] like Figure 8 、 Figure 9 、 Figure 10 、 Figure 11As shown, based on the above embodiment, in this embodiment, the striking structure 4 includes a striking pillar 45 arranged on the frame 1, a striking support plate 41 arranged on the striking pillar 45, a pendulum arm 48 rotatably arranged on the striking support plate 41, and a pendulum 49 arranged at the free end of the pendulum arm 48.

[0071] The striking rod 322 is positioned in the path of the pendulum 49. By swinging the pendulum 49, the pendulum 49 can strike the striking rod 322, thereby applying an impact to the striking rod 322, causing the striking rod 322 to strike the test piece 5. By controlling the length of the effective path from the pendulum 49 to the striking rod 322, the magnitude of the force applied by the pendulum 49 to the striking rod 322 can be controlled.

[0072] The striking support plate 41 is provided with a pendulum bracket 413 , on which a ratchet 47 with ratchet teeth 471 and a sear 412 used in conjunction with the ratchet teeth 471 are rotatably provided. The pendulum arm 48 is transmission-connected to the ratchet 47 .

[0073] By connecting the pendulum arm 48 to the ratchet 47 in transmission, the pendulum arm 48 and the ratchet 47 can rotate synchronously, thereby utilizing the cooperation between the sear 412 and the ratchet teeth 471 to achieve the function of locking the pendulum arm 48, thereby facilitating locking or releasing the pendulum 49 as needed.

[0074] In this embodiment, the ratchet wheel 47 is provided with scale lines, so that the rotation angle of the ratchet wheel 47 can be read out, which is convenient for calculating the position of the pendulum 49.

[0075] In this embodiment, the ratchet wheel 47 and the pendulum arm 48 are mounted on the same shaft to achieve synchronous rotation.

[0076] like Figure 10 、 Figure 11 As shown, in this embodiment, a sear shaft 415 whose axis is parallel to the axis of the ratchet 47 is provided on the pendulum bracket 413, the sear 412 is rotatably set on the sear shaft 415, and the sear shaft 415 is sleeved with a sear spring 416 connected between the sear 412 and the pendulum bracket 413.

[0077] By rotating the sear 412 , the sear 412 and the ratchet 47 can be controlled to be clamped or opened, thereby facilitating the control of the ratchet 47 . The sear spring 416 can be used to apply pre-pressure to the sear 412 , thereby facilitating the resetting of the sear 412 .

[0078] In this embodiment, the pendulum bracket 413 is provided with a sear cylinder 411 which is transmission-connected to the sear 412. In this way, the sear cylinder 411 is conveniently used to drive the sear 412 to rotate around the sear shaft 415.

[0079] In this embodiment, a lever 414 is rotatably provided on the striking support plate 41 , the free end of the lever 414 is transmission-connected to the pendulum arm 48 , and the free end of the lever 414 is provided with a follower cam 417 rollingly connected to the pendulum arm 48 .

[0080] By driving the lever 414 to rotate, the lever 414 drives the pendulum arm 48 to rotate, thereby controlling the position of the pendulum 49. When the lever 414 rotates, the follower cam 417 and the pendulum arm 48 are in rolling connection, thereby reducing resistance during movement and wear on the pendulum arm 48. This prevents the pendulum arm 48 from bending and deforming under force, which could affect the position accuracy of the pendulum 49.

[0081] In this embodiment, a striking motor 42 is provided on the striking support plate 41, and a speed reducer 43 is connected between the striking motor 42 and the shifting rod 414. In this way, the striking motor 42 can be used to drive the shifting rod 414 to rotate through the speed reducer 43.

[0082] In this embodiment, the lever 414 is used to rotate the pendulum arm 48 from the lowest position to the horizontal position, and the ratchet 47 is then used to lock the pendulum arm 48. The striking motor 42 is then used to rotate the lever 414 back to the lowest position. After the ratchet 47 is opened and the pendulum 49 is released, the lever 414 is prevented from obstructing the downward rotation of the pendulum arm 48. A brake cylinder 410 can be provided on the striking support plate 41 to lock the ratchet 47, preventing the connection between the ratchet 47 and the sear 412 from failing due to the weight of the pendulum 49, thereby enhancing safety.

[0083] The pendulum bracket 413 is provided with a position sensor 46. When the pendulum arm 48 rotates to contact the position sensor 46, the position sensor 46 generates the position of the pendulum arm 48. At this time, the sear 412 is used to lock the ratchet 47, and the striking motor 42 is then controlled to reverse and reset the lever 414. The provision of the position sensor 46 facilitates detection of the position of the pendulum arm 48, ensuring that the pendulum 49 exerts the same impact force on the striking rod 322 during each strike, thereby ensuring experimental accuracy.

[0084] In this embodiment, two pendulum arms 48 are provided and symmetrically distributed on both sides of the ratchet 47 , thereby improving the strength and stability of the pendulum arms 48 themselves, thereby improving the stability and position accuracy of the blasting hammer 49 .

[0085] In this embodiment, other undescribed contents are the same as those in the above embodiment and thus will not be described in detail.

[0086] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A system for measuring friction sensitivity of energetic materials, characterized by: The invention comprises a frame (1), a test structure (3) arranged on the frame (1) and capable of clamping a test piece (5), and a striking structure (4) arranged above the test structure (3) and used for applying a striking force to the test piece (5); a striking rod (322) capable of aligning with the test piece (5) and being transmission-connected to the striking structure (4) is slidably arranged on the test structure (3); the test structure (3) comprises an instrument body (312) arranged in the frame (1) and having a through hole, an upper pillar (35) arranged at one end of the through hole, and a punch (317) slidably arranged at the other end of the through hole and capable of clamping the test piece (5) with the upper pillar (35); a side of the instrument body (312) is provided with a punch (317) The opening is connected to the through hole, the striking rod (322) is aligned with the opening on the instrument body (312), and a driving structure (2) for driving the punch (317) to move is provided on the frame (1); a test base plate (31) is provided in the frame (1), a plurality of test pillars (32) are provided on the test base plate (31), a test top plate (33) is provided on the test pillars (32), the instrument body (312) is mounted on the lower surface of the test top plate (33) through a flange (34), and the upper pillar (35) is provided on the lower surface of the flange (34); a bracket (315) is provided in the instrument body (312), and a small The stepped through hole is upwardly directed, one end of the punch (317) is mounted in cooperation with the small hole of the stepped through hole, the large hole of the stepped through hole is connected to a bracket nut (319) by a thread, one end of the punch (317) passes through the bracket nut (319), a shaft shoulder is provided on the punch (317), a spring (316) sleeved on the punch (317) is provided in the large hole of the stepped through hole; a guide sleeve (314) is provided between the bracket (315) and the upper pillar (35), a through hole for mounting in cooperation with the experimental piece (5) is provided in the guide sleeve (314), and one end of the instrument body (312) away from the upper pillar (35) is connected to a body nut (318) for limiting the bracket (315); The driving structure (2) comprises a pressure head (26), a positioning shaft (28), a guide head (29), a pressure sensor (210), a pressure head connector (211), a transition head (212) and an electric cylinder shaft (23) of an electric cylinder (22) which are connected in sequence from top to bottom; a driving structure support plate (21) is provided on the frame (1); a plurality of driving structure pillars (24) are provided on the driving structure support plate (21); a driving structure flat plate (25) is provided on the driving structure pillar (24); a driving guide sleeve (27) which is slidably connected to the positioning shaft (28) is provided on the driving structure flat plate (25); the positioning shaft (28) and the guide head (29) are connected via a spherical surface.

2. The system for measuring friction sensitivity of energetic materials according to claim 1, characterized in that: A limit pin (3121) is provided at one end of the instrument body (312) close to the body nut (318), and a bracket limit groove (3151) is provided on the bracket (315) for being installed in cooperation with the limit pin (3121). The bracket (315) is slidably arranged in the instrument body (312), and a locking structure capable of guiding the sleeve (314) is provided on the test base plate (31).

3. The system for measuring friction sensitivity of energetic materials according to claim 2, characterized in that: The striking structure (4) comprises a striking support (45) arranged on a frame (1), a striking support plate (41) arranged on the striking support (45), a pendulum arm (48) rotatably arranged on the striking support plate (41), and a pendulum (49) arranged at the free end of the pendulum arm (48); a pendulum bracket (413) is arranged on the striking support plate (41), a ratchet (47) with ratchet teeth (471) is rotatably arranged on the pendulum bracket (413), and a ratchet (47) used in conjunction with the ratchet teeth (471) is used in conjunction with the ratchet teeth (471). The invention relates to a device for rotating actuating a rocker (412), wherein the pendulum arm (48) is connected to the ratchet (47) in a transmission manner; a rocker shaft (415) having an axis parallel to the axis of the ratchet (47) is provided on the pendulum bracket (413); the rocker (412) is rotatably provided on the rocker shaft (415); and a rocker spring (416) connected between the rocker (412) and the pendulum bracket (413) is sleeved on the rocker shaft (415); and a rocker cylinder (411) connected to the rocker (412) in a transmission manner is provided on the pendulum bracket (413).

4. The system for measuring friction sensitivity of energetic materials according to claim 3, wherein: A shift lever (414) is rotatably provided on the striking support plate (41), the free end of the shift lever (414) is transmission-connected to the pendulum arm (48), and the free end of the shift lever (414) is provided with a follower cam (417) rollingly connected to the pendulum arm (48); a striking motor (42) is provided on the striking support plate (41), and a reducer (43) is connected between the striking motor (42) and the shift lever (414).

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