A bullet recovery push rod device for Hopkinson bar experiments

Abstract

The present invention provides a bullet recovery push rod device for Hopkinson bar experiments, which relates to the technical field of Hopkinson push rod devices and includes: a fixed table, the fixed table is fixedly installed on the ground through legs provided at the four corners of the bottom, a fixed firing box, the fixed firing box is fixedly installed above the fixed table through a suspension column provided at the upper end, a fixed sleeve, the fixed sleeve is fixedly installed on the side of the fixed firing box away from the lifting firing groove, and the firing channel extends into the fixed sleeve; an incident bar, the incident bar is arranged on the side of the fixed sleeve away from the fixed firing box. The bullet recovery device provided by the present invention can automatically withdraw the bullet from the fixed firing box after the bullet collision and fall into the bullet recovery chute box. After each collision experiment is completed, the experimenter can relatively easily evaluate the bullet damage. After the evaluation is confirmed to be correct, the bullet is loaded again through the push rod mechanism, thereby ensuring the accuracy of the experimental results.

Description

Technical Field

[0001] The invention relates to the technical field of Hopkins push rod devices, in particular to a bullet recovery push rod device used for a Hopkinson bar experiment. Background Art

[0002] A Hopkinson pressure rod launching and bullet recovery system with a publication number of "CN206523379U" in the prior art comprises a test bench and an air chamber, wherein the test bench is provided with a base, on which a launch tube, a launch cavity, a three-way connection, a manual ball valve, a pneumatic ball valve, a pressure regulating valve, an air chamber, a bullet inside the launch tube, an incident rod, a transmission rod, and a buffer device for the limit transmission rod are sequentially arranged, a bullet is arranged in the launch cavity, a three-way joint is arranged on the high-pressure ventilation pipeline, and another joint of the three-way joint is connected to a vacuum pump through an exhaust pipe, and compressed air pressurizes the launch cavity through the air chamber so as to push the bullet into the launch tube to achieve the effect of bullet launching, and when the bullet needs to be recovered, negative pressure is applied to the launch tube through the vacuum pump gas and the three-way joint to achieve the recovery of the bullet, wherein the manual valve is normally open in the test, and the pneumatic ball valve is only opened during launching, and in addition, the pneumatic valve can be used to avoid electromagnetic waves emitting when the solenoid valve is opened to interfere with data collection.

[0003] However, the above-mentioned device still has obvious defects during use: the above-mentioned device adopts pneumatic method to recover and load bullets. Although the operation is simple, the entire recovery process is carried out in the shooting tube. Since the bullet needs to collide repeatedly during the experiment, internal or surface damage may occur during the collision, thereby affecting the accuracy of the experimental results. Therefore, it is necessary to evaluate the damage of the bullet after the collision. Therefore, the above-mentioned loading method will not be conducive to the damage assessment of the bullet, which may affect the experimental results due to the damage of the bullet. Summary of the invention

[0004] The object of the present invention is to provide a bullet recovery push rod device for Hopkinson bar experiment to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A bullet recovery push rod device for a Hopkinson bar experiment, comprising:

[0007] A fixed platform, the fixed platform is fixedly installed on the ground through legs arranged at the four corners of the bottom, a bullet recovery chute box is fixedly installed on the upper surface of the fixed platform, a push rod hole is opened in the bullet recovery chute box, a loading push rod is telescopically installed in the push rod hole, and the loading push rod is fixedly connected to the telescopic arm of the hydraulic telescopic cylinder;

[0008] Fixed firing box, the fixed firing box is fixedly installed above the fixed table through a suspension column arranged at the upper end. A firing channel is provided in the fixed firing box. An elevating firing groove and an elevating deflection groove communicating with the firing channel are also provided in the fixed firing box. An elevating firing box is arranged in the elevating firing groove in a lifting manner, and a deflection block is arranged in the elevating deflection groove in a lifting manner. A loading groove for the bullet to be inserted is provided in the elevating firing box. The elevating firing box forms two working modes, namely a loading state and a firing state, through lifting displacement. Transition channels and bullet recovery channels are respectively provided at the upper and lower positions of the deflection block. Through the lifting movement of the deflection block, the transition channel or the bullet recovery channel is matched with the firing channel; wherein,

[0009] In the loading state, the elevating firing box descends to the bottom limit position. At this time, the bullet falling into the bullet recovery chute box is pushed into the loading groove by the loading push rod;

[0010] In the firing state, the elevating firing box rises to the top limit position. At this time, the axis of the loading groove coincides with the axis of the firing channel. The air pumping device installed in the elevating firing box pumps air into the loading groove to push the bullet to impact outwards through the firing channel;

[0011] When the transition channel is matched with the firing channel, the fired bullet can pass through the transition channel and shoot outwards;

[0012] When the bullet recovery channel is matched with the firing channel, the bullet shot outwards can return to the firing channel after collision and fall into the bullet recovery chute box from the bullet recovery channel; Further included,

[0013] Fixed sleeve, the fixed sleeve is fixedly installed on the side of the fixed firing box away from the elevating firing groove, and the firing channel extends into the fixed sleeve;

[0014] Incident rod, the incident rod is arranged on the side of the fixed sleeve away from the fixed firing box. The bullet passes through the fixed sleeve and collides with the incident rod, so as to transfer kinetic energy. A transmission rod is also arranged on the side of the incident rod away from the fixed sleeve. The gap between the incident rod and the transmission rod is used for placing the collision specimen.

[0015] Preferably, a through hole for the elevating firing box to lift is provided on the fixed table. Worm gear reduction motors are fixedly installed on both sides of the fixed table on both sides of the through hole. A lifting drive gear is fixedly installed on the drive shaft of the worm gear reduction motor, and the lifting drive gear meshes with the tooth grooves provided on both sides of the elevating firing box.

[0016] Preferably, a spring seat is fixedly installed on one side of the direction-changing block close to the lifting firing groove. A traction spring is fixedly installed on the spring seat. One end of the traction spring away from the spring seat is connected to the fixed firing box. Under the action of no external force, the traction spring pulls the direction-changing block upward so that the bullet recovery channel and the firing channel are kept in cooperation.

[0017] Preferably, limit frames are also fixedly installed on the fixed firing boxes on both sides of the direction-changing block. The limit frames are rotatably installed with abutting limit claws through the opened rotating shaft holes. The two abutting limit claws cooperate with the limit grooves opened on the direction-changing block. When the direction-changing block moves downward against the elastic force of the traction spring, the two abutting limit claws arranged on both sides cooperate with the limit grooves. At this time, the transition channel of the direction-changing block cooperates with the firing channel of the fixed firing box.

[0018] Preferably, operating push rods are also fixedly installed on the sides of the two abutting limit claws away from the direction-changing block. When the bullet shoots into the fixed sleeve, the operating push rods push the two abutting limit claws on both sides to release the cooperation with the limit grooves. At this time, the direction-changing block rises under the traction of the traction spring, so that the bullet recovery channel and the firing channel are in cooperation, thereby guiding the bullet rebounding into the firing channel to fall into the bullet recovery chute box through the bullet recovery channel.

[0019] Preferably, a number of annularly arrayed cylinder holes are opened in the fixed sleeve. Driving cylinders are fixedly installed in the cylinder holes. An air-operated disc is also fixedly installed on the fixed sleeve around the driving cylinders. The air-operated disc is communicated with an operating cylinder through a hollow pipe. The piston end of the operating push rod is movably inserted into the operating cylinder. A driving piston rod is telescopically arranged in each driving cylinder. One end of the driving piston rod close to the firing channel is fixedly connected with a pushing ball. One end of the driving piston rod away from the pushing ball is provided with a compression spring. The compression spring is used to push the pushing ball toward the side close to the axis of the firing channel under the action of no external force. When the bullet is fired into the fixed sleeve, the bullet pushes a number of pushing balls to do work against the elastic force of the compression spring. At this time, the gas in the driving cylinder enters the operating cylinder through the air-operated disc and the hollow pipe, thereby pushing the operating push rod to extend outward and making the abutting limit claws release the limit on the direction-changing block.

[0020] Preferably, a buffer block is telescopically installed on the side of the fixed sleeve away from the fixed firing box. The buffer block is movably inserted on the slide rod frame through slide rods arranged on both sides. The slide rod frame is fixedly installed on the fixed firing box. A buffer spring is fixedly installed between the slide rod frame and the buffer block. An assembly plug rod block is fixedly installed between the buffer blocks. The assembly plug rod block extends into the fixed sleeve. A translation plug rod provided at the front end of the assembly plug rod block is inserted into a plug rod hole opened in the fixed sleeve. Firing channels are provided between the buffer block and the assembly plug rod block. After the incident rod rebounds, it abuts against the buffer block. The buffer block is provided to prevent the incident rod from directly colliding with the fixed sleeve after rebounding.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] The bullet recovery device provided by the present invention can automatically withdraw from the fixed firing box after the bullet collides and fall into the bullet recovery chute box. It is easier for experimenters to evaluate the bullet damage after each collision experiment. After the evaluation is confirmed to be correct, the bullet is loaded again through the push rod mechanism, thus ensuring the accuracy of the experimental results. Description of the Drawings

[0023] Figure 1 It is an exploded schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a three-dimensional schematic diagram of the installation and connection structure of the driving cylinder of the present invention;

[0025] Figure 3 It is a three-dimensional schematic diagram of the installation structure of the abutting limit claw of the present invention;

[0026] Figure 4 It is a schematic diagram of the lifting firing box of the present invention in the firing state;

[0027] Figure 5 It is a schematic diagram of the cooperation state of the bullet recovery channel and the firing channel of the deflector block of the present invention;

[0028] Figure 6 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0029] Figure 7 It is a schematic diagram of the lifting firing box of the present invention in the bullet loading state.

[0030] In the figure: 1 is a fixed platform, 2 is a bullet recovery chute box, 3 is a loading push rod, 4 is a fixed firing box, 5 is a firing channel, 6 is a lifting firing groove, 7 is a lifting deflection groove, 8 is a lifting firing box, 9 is a deflection block, 10 is a loading groove, 11 is a transition channel, 12 is a bullet recovery channel, 13 is a fixed sleeve, 14 is an incident rod, 15 is a through hole, 16 is a worm reduction motor, 17 is a tooth groove, 18 is a traction spring, 19 is a limit frame, 20 is an abutting limit claw, 21 is a limit groove, 22 is an operating push rod, 23 is a driving cylinder, 24 is a pneumatic disc, 25 is a hollow pipe, 26 is an operating cylinder, 27 is a main piston rod, 28 is a pushing ball, 29 is a compression spring, 30 is a buffer block, 31 is a sliding rod, 32 is a sliding rod frame, 33 is a buffer spring, 34 is an assembly plug rod block, 35 is a plug rod hole. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figure 1-7 , the present invention provides a technical solution:

[0033] Embodiment 1:

[0034] A bullet recovery push rod device for Hopkinson bar experiments, comprising:

[0035] A fixed platform 1, the fixed platform 1 is fixedly installed on the ground through legs provided at the four corners of the bottom, and a bullet recovery chute box 2 is fixedly installed on the upper surface of the fixed platform 1. A push rod hole is opened in the bullet recovery chute box 2, and a loading push rod 3 is telescopically installed in the push rod hole. The loading push rod 3 is fixedly connected to the telescopic arm of a hydraulic telescopic cylinder;

[0036] A fixed firing box 4, the fixed firing box 4 is fixedly installed above the fixed platform 1 through a suspension column provided at the upper end. A firing channel 5 is opened in the fixed firing box 4. A lifting firing groove 6 and a lifting deflection groove 7 communicating with the firing channel 5 are also opened in the fixed firing box 4. A lifting firing box 8 is arranged in a lifting manner in the lifting firing groove 6, and a deflection block 9 is arranged in a lifting manner in the lifting deflection groove 7. A loading groove 10 for bullets to be embedded is opened in the lifting firing box 8. The lifting firing box 8 forms two working modes: a loading state and a firing state through lifting displacement. Transition channels 11 and bullet recovery channels 12 are respectively opened at the upper and lower positions of the deflection block 9. Through the lifting movement of the deflection block 9, the transition channel 11 or the bullet recovery channel 12 is matched with the firing channel 5; wherein,

[0037] In the loading state, the lifting firing cartridge 8 descends to the bottom limit position. At this time, the bullet in the bullet recovery chute box 2 is pushed into the loading groove 10 by the loading push rod 3;

[0038] In the firing state, the lifting firing cartridge 8 ascends to the top limit position. At this time, the axis of the loading groove 10 coincides with the axis of the firing channel 5. The air pumping device installed in the lifting firing cartridge 8 pumps air into the loading groove 10 to push the bullet to impact outward through the firing channel 5;

[0039] When the transition channel 11 cooperates with the firing channel 5, the fired bullet can pass through the transition channel 11 and shoot outwards;

[0040] When the bullet recovery channel 12 cooperates with the firing channel 5, the bullet shot outwards can return to the firing channel 5 after collision and fall into the bullet recovery chute box 2 from the bullet recovery channel 12; Further included is,

[0041] The fixed sleeve 13 is fixedly installed on the side of the fixed firing cartridge 4 away from the lifting firing groove 6, and the firing channel 5 extends into the fixed sleeve 13;

[0042] The incident rod 14 is arranged on the side of the fixed sleeve 13 away from the fixed firing cartridge 4. The bullet is shot out through the fixed sleeve 13 and collides with the incident rod 14, so as to conduct kinetic energy transfer. A transmission rod is also arranged on the side of the incident rod 14 away from the fixed sleeve 13. The gap between the incident rod and the transmission rod is used for placing the collision specimen.

[0043] In this embodiment, both the fixed platform 1 and the fixed firing box 4 are fixedly arranged. A bullet recovery chute box 2 is fixedly installed on the fixed platform 1 to carry the recoiled bullet through the bullet recovery chute box 2, so that after the collision, the bullet is exposed in the field of vision of the experimenter and can be picked up for evaluating the damage state of the bullet. After the evaluation confirms that the bullet is undamaged, it can be loaded and used again. Compared with the existing loading methods, this loading method facilitates the experimenter to check the state of the bullet. A lifting firing groove 6 and a lifting deflection groove 7 are formed at the bottom of the fixed firing box 4. A lifting firing box 8 and a deflection block 9 are correspondingly arranged in the lifting firing groove 6 and the lifting deflection groove 7 in a lifting manner. A through hole 15 for the lifting of the lifting firing box 8 is formed on the fixed platform 1. Worm reduction motors 16 are fixedly installed on both sides of the fixed platform 1 on both sides of the through hole 15. A lifting drive gear is fixedly installed on the drive shaft of the worm reduction motor 16, and the lifting drive gear meshes with the tooth grooves 17 formed on both sides of the lifting firing box 8. The bullet is loaded through the loading groove 10 formed in the lifting firing box 8 and fired through the firing channel 5 formed in the fixed firing box 4. The deflection block 9 changes the moving direction of the bullet by lifting. When the transition channel 11 cooperates with the firing channel 5, the bullet can be fired out of the fixed firing box 4 at this time. When the bullet recovery channel 12 cooperates with the firing channel 5, the rebounded bullet can fall into the bullet recovery chute box 2 through the bullet recovery channel 12. Since most of the existing bullets are in a cylindrical shape, the provided bullet recovery channel 12 should be able to allow the bullet to pass through smoothly. A fixed sleeve 13 is also installed in the direction of the bullet exiting the fixed firing box 4. As an extension of the fixed firing box 4, the firing channel 5 provided therein can further ensure the stability of the bullet exiting.

[0044] Embodiment Two:

[0045] A spring seat is fixedly installed on one side of the deflection block 9 close to the lifting firing groove 6, and a traction spring 18 is fixedly installed on the spring seat. One end of the traction spring 18 away from the spring seat is connected to the fixed firing box 4. The traction spring 18 pulls the deflection block 9 upward under the action of no external force so that the bullet recovery channel 12 and the firing channel 5 remain in cooperation.

[0046] Limit frames 19 are also fixedly installed on the fixed firing box 4 on both sides of the deflection block 9. The limit frames 19 are rotatably installed with abutting limit claws 20 through the formed rotation shaft holes. The two abutting limit claws 20 cooperate with the limit grooves 21 formed on the deflection block 9. When the deflection block 9 moves downward against the elastic force of the traction spring 18, the two provided abutting limit claws 20 cooperate with the limit grooves 21. At this time, the transition channel 11 of the deflection block 9 cooperates with the firing channel 5 of the fixed firing box 4.

[0047] On the side away from the deflection block 9 of the abutting limit claws 20 on both sides, an operating push rod 22 is fixedly installed. When a bullet enters the fixed sleeve 13, the operating push rod 22 pushes the abutting limit claws 20 on both sides to release the cooperation with the limit groove 21. At this time, the deflection block 9 rises under the traction of the traction spring 18, so that the bullet recovery channel 12 cooperates with the firing channel 5, thereby guiding the bullet that rebounds into the firing channel 5 to fall into the bullet recovery chute box 2 through the bullet recovery channel 12.

[0048] In this embodiment, the connection mechanism of the deflection block 9 is further disclosed. Through the setting of the traction spring 18, the deflection block 9 always has a tendency to rebound and reset. Through the setting of the abutting limit claws 20, the reset of the traction spring 18 is blocked, and the operating push rod 22 is used to push the abutting limit claws 20, so as to release the limit on the deflection block 9. Therefore, by pushing the operating push rod 22, the transition channel 11 or the bullet recovery channel 12 can be made to cooperate with the firing channel 5. The operating push rod 22 can be driven by the operation of an electrical device. For example, after the photoelectric mechanism detects that a bullet enters the fixed sleeve 13, the electrical device operates to push the operating push rod 22 to move. This solution needs to be used in combination with a bullet position recognition device and an electrical component that pushes the operating push rod 22 to move.

[0049] Embodiment Three:

[0050] A number of annularly arranged cylinder holes are provided in the fixed sleeve 13. A driving cylinder 23 is fixedly installed in the cylinder holes. An air cylinder disc 24 is also fixedly installed on the fixed sleeve 13 outside the driving cylinder 23. The air cylinder disc 24 is communicated with an operating cylinder 26 through a hollow pipe 25. The piston end of the operating push rod 22 is movably inserted into the operating cylinder 26. A driving piston rod 27 is telescopically arranged in each driving cylinder 23. A pushing ball 28 is fixedly connected to one end of the driving piston rod 27 close to the firing channel 5. An extrusion spring 29 is arranged at the other end of the driving piston rod 27 away from the pushing ball 28. The extrusion spring 29 is used to push the pushing ball 28 toward the side close to the axis of the firing channel 5 under the action of no external force. When a bullet is fired and enters the fixed sleeve 13, the bullet pushes a number of pushing balls 28 to do work against the elastic force of the extrusion spring 29. At this time, the gas in the driving cylinder 23 enters the operating cylinder 26 through the air cylinder disc 24 and the hollow pipe 25, thereby pushing the operating push rod 22 to extend outward and making the abutting limit claws 20 release the limit on the deflection block 9.

[0051] In this embodiment, a plurality of driving cylinders 23 are further arranged in the fixed sleeve 13. When the bullet enters the fixed sleeve 13 and pushes the pushing ball 28 to move away from the axis position of the firing channel 5, the active piston rod 27 is pushed. At this time, the gas of the driving cylinder 23 finally enters the actuating cylinder 26, so as to push the actuating push rod 22 to extend outwards and release the limit of the abutting limit claw 20 on the direction-changing block 9. The setting of this scheme no longer requires the participation of the electrical components and sensor components in the second embodiment, so as to utilize the kinetic energy generated by the bullet ejection to release the limit of the abutting limit claw 20 on the direction-changing block 9.

[0052] Embodiment 4:

[0053] A buffer block 30 is telescopically installed on the side of the fixed sleeve 13 away from the fixed firing box 4. The buffer block 30 is movably inserted on the slide rod frame 32 through the slide rods 31 arranged on both sides. The slide rod frame 32 is fixedly installed on the fixed firing box 4. A buffer spring 33 is fixedly installed between the slide rod frame 32 and the buffer block 30. An assembly insertion rod block 34 is fixedly installed between the buffer blocks 30. The assembly insertion rod block 34 extends into the fixed sleeve 13. The translation insertion rod provided at the front end of the assembly insertion rod block 34 is inserted into the insertion rod hole 35 opened in the fixed sleeve 13. Firing channels 5 are provided between the buffer block 30 and the assembly insertion rod block 34. After the incident rod 14 rebounds, it abuts against the buffer block, and the buffer block 30 is provided to prevent the incident rod 14 from directly colliding with the fixed sleeve 13 after rebounding.

[0054] In this embodiment, since the incident rod 14 will generate a rebound displacement after hitting the specimen, the buffer block 30 can prevent the incident rod 14 from directly hitting the fixed firing box 4 and the fixed sleeve 13, so as to protect the device.

[0055] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bullet recovery push rod device for Hopkinson bar experiments, characterized in that Including: A fixed table, which is fixedly installed on the ground through legs provided at the four corners of the bottom. A bullet recovery chute box is fixedly installed on the upper surface of the fixed table. A push rod hole is opened in the bullet recovery chute box. A loading push rod is telescopically installed in the push rod hole. The loading push rod is fixedly connected to the telescopic arm of a hydraulic telescopic cylinder; A fixed firing box, which is fixedly installed above the fixed table through a suspension column provided at the upper end. A firing channel is opened in the fixed firing box. A lifting firing groove and a lifting deflection groove communicating with the firing channel are also opened in the fixed firing box. A lifting firing box is arranged in the lifting firing groove in a lifting manner. A deflection block is arranged in the lifting deflection groove in a lifting manner. A loading groove for the bullet to be embedded is opened in the lifting firing box. The lifting firing box forms two working modes, namely a loading state and a firing state, through lifting displacement. Transition channels and bullet recovery channels are respectively opened at the upper and lower positions of the deflection block. The transition channel or the bullet recovery channel is matched with the firing channel through the lifting movement of the deflection block; wherein, In the loading state, the lifting firing box descends to the bottom limit position. At this time, the bullet falling into the bullet recovery chute box is pushed into the loading groove by the loading push rod; In the firing state, the lifting firing box ascends to the top limit position. At this time, the axis of the loading groove coincides with the axis of the firing channel. The bullet is pushed to impact outwards through the firing channel by pumping air into the loading groove by a pneumatic pumping device installed in the lifting firing box; When the transition channel is matched with the firing channel, the fired bullet can pass through the transition channel and shoot outwards; When the bullet recovery channel is matched with the firing channel, the bullet shooting outwards can return to the firing channel after collision and fall into the bullet recovery chute box from the bullet recovery channel; Also included is, A fixed sleeve, which is fixedly installed on the side of the fixed firing box away from the lifting firing groove. The firing channel extends into the fixed sleeve; An incident rod, which is arranged on the side of the fixed sleeve away from the fixed firing box. The bullet shoots out through the fixed sleeve and collides with the incident rod, so as to perform kinetic energy transfer. A transmission rod is also arranged on the side of the incident rod away from the fixed sleeve. The gap between the incident rod and the transmission rod is used for placing a collision specimen.

2. The bullet recovery push rod device for Hopkinson bar experiment according to claim 1, characterized in that: A through hole for the lifting firing box to lift is opened on the fixed table. Worm gear reduction motors are fixedly installed on both sides of the fixed table on both sides of the through hole. A lifting drive gear is fixedly installed on the drive shaft of the worm gear reduction motor. The lifting drive gear meshes with the tooth grooves opened on both sides of the lifting firing box.

3. A bullet recovery push rod device for Hopkinson bar experiment according to claim 1, characterized in that: A spring seat is fixedly installed on the side of the deflection block close to the lifting firing groove. A traction spring is fixedly installed on the spring seat. One end of the traction spring away from the spring seat is connected to the fixed firing box. The traction spring pulls the deflection block upwards under the action of no external force so that the bullet recovery channel and the firing channel remain in cooperation.

4. A bullet recovery push rod device for Hopkinson bar experiment according to claim 1, characterized in that: On the fixed firing boxes located on both sides of the deflection block, a limit frame is also fixedly installed. The limit frame is rotatably installed with a abutting limit claw through a shaft hole opened. The two abutting limit claws cooperate with the limit grooves opened on the deflection block. When the deflection block moves downward against the elastic force of the traction spring to do work, the two abutting limit claws provided cooperate with the limit grooves. At this time, the transition channel of the deflection block cooperates with the firing channel of the fixed firing box.

5. The bullet recovery push rod device for Hopkinson bar experiment according to claim 4, wherein: On the side of the two abutting limit claws away from the deflection block, an operating push rod is also fixedly installed. When a bullet enters the fixed sleeve, the operating push rod pushes the two abutting limit claws to release the cooperation with the limit grooves. At this time, the deflection block rises under the traction of the traction spring, so that the bullet recovery channel cooperates with the firing channel, thereby guiding the bullet that rebounds into the firing channel to fall into the bullet recovery chute box through the bullet recovery channel.

6. The bullet recovery push rod device for Hopkinson bar experiment according to claim 5, characterized in that: A number of annularly arrayed cylinder holes are opened in the fixed sleeve. A driving cylinder is fixedly installed in the cylinder holes. An air-operated disc is also fixedly installed on the fixed sleeve outside the driving cylinder. The air-operated disc is communicated with the operating cylinder through a hollow pipe. The piston end of the operating push rod is movably inserted into the operating cylinder. An active piston rod is telescopically arranged in each driving cylinder. One end of the active piston rod close to the firing channel is fixedly connected with a pushing ball. One end of the active piston rod away from the pushing ball is provided with a compression spring. The compression spring is used to push the pushing ball toward the side close to the axis of the firing channel when there is no external force. When a bullet is fired into the fixed sleeve, the bullet pushes a number of pushing balls to do work against the elastic force of the compression spring. At this time, the gas in the driving cylinder enters the operating cylinder through the air-operated disc and the hollow pipe, thereby pushing the operating push rod to extend outward and releasing the limit of the deflection block by the abutting limit claws.

7. A bullet recovery push rod device for Hopkinson bar experiment according to claim 1 or 6, characterized in that: A buffer block is also telescopically installed on the side of the fixed sleeve away from the fixed firing box. The buffer block is movably inserted into a slide bar frame through slide bars provided on both sides. The slide bar frame is fixedly installed on the fixed firing box. A buffer spring is connected between the slide bar frame and the buffer block. An assembly inserting rod block is fixedly installed on the side of the buffer block close to the fixed sleeve. The assembly inserting rod block extends into the fixed sleeve. A translation inserting rod provided at the front end of the assembly inserting rod block is inserted into an inserting rod hole opened in the fixed sleeve. Firing channels are opened between the buffer block and the assembly inserting rod block. After the incident rod rebounds, it abuts against the buffer block. The buffer block is provided to prevent the incident rod from directly colliding with the fixed sleeve after rebounding.

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