Device and method for preventing rebounding and falling of heavy hammer of liquid oxygen impact testing machine from secondary impact on test piece

Abstract

The invention relates to the technical field of liquid oxygen impact tests, in particular to a device and method for preventing a heavy hammer of a liquid oxygen impact testing machine from rebounding and falling back to secondarily impact a test piece, the device comprises a base, the upper surface of the base is provided with a test piece cup, and a firing pin is arranged above the test piece cup; the connecting seat is arranged above the base, and a heavy hammer is arranged on the lower end face of the connecting seat; the fixing rod is arranged on the upper surface of the base, and a lower limiting switch is arranged on the outer surface of the fixing rod; the air cylinder is arranged on the upper surface of the base, and the output end of the air cylinder is connected with a rubber damper; the device has the beneficial effects that the impact on a test piece in a liquid oxygen environment is simulated through the cooperation of the freely falling heavy hammer and the firing pin, when the connecting seat moves downwards along the guide rod, the lower limiting switch is triggered to send out a signal, the console sends out a signal to the electromagnetic valve after receiving the signal, and the electromagnetic valve controls the air cylinder to eject out the rubber shock absorber; and the counter weight after rebounding and rising is limited, so that the purpose of preventing the counter weight from rebounding and falling back to secondarily impact the test piece is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of liquid oxygen impact testing, in particular to a device and a method for preventing a heavy hammer of a liquid oxygen impact testing machine from rebounding and falling back to impact a test piece for the second time. Background Art

[0002] Liquid oxygen is the form of oxygen in liquid state. Due to the ultra-low temperature and strong oxidizing properties of liquid oxygen, when ordinary materials are subjected to external stimuli such as impact, collision, friction, static electricity, etc. in a liquid oxygen environment, rapid chemical reactions may occur, resulting in sparks, combustion, or even explosions. This is the incompatibility of liquid oxygen. Special materials used in liquid oxygen environments must be evaluated for their liquid oxygen compatibility. The scientific and industrial communities have designed and developed a variety of methods for evaluating the compatibility of materials with liquid oxygen. Among them, the liquid oxygen shock sensitivity test is the most convenient, efficient, low-cost and widely used method. This method stipulates that when the impact energy is 98J, if the material passes 20 independent impact tests in a liquid oxygen environment without any reaction, or only reacts once in 60 independent tests, the material can be considered to be compatible with liquid oxygen and can be used in most liquid oxygen applications.

[0003] Relevant units at home and abroad have developed a variety of liquid oxygen shock sensitivity test devices, but generally have not considered the mechanism to prevent the heavy hammer from rebounding and causing a secondary impact on the test piece. This is because the liquid oxygen shock sensitivity test examines the test phenomenon after the sample is subjected to a 98J energy impact, and the heavy hammer will inevitably rebound and fall after hitting the firing pin to cause a secondary impact on the sample. This process is extremely short, resulting in an inability to accurately judge whether the liquid oxygen shock sensitivity reaction of the sample is caused by the first impact or the secondary impact caused by the heavy hammer rebounding and falling, which has a significant impact on the accuracy of the test results. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the main purpose of the present invention is to provide a device and method for preventing the rebound and fall of the heavy hammer of the liquid oxygen impact tester from causing a secondary impact on the test piece.

[0005] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0006] A device for preventing a liquid oxygen impact tester's hammer from rebounding and falling back to impact a test piece for the second time, comprising:

[0007] A base, wherein a matching specimen cup is disposed on the upper surface of the base, and a matching striker is disposed above the specimen cup;

[0008] A connecting seat is slidably arranged above the base, and a matching heavy hammer is arranged at a position above the striker corresponding to the lower end surface of the connecting seat;

[0009] A fixing rod is arranged on the upper surface of the base, and a matching lower limit switch is arranged on the outer surface of the fixing rod at a position corresponding to the connecting seat;

[0010] The cylinder is arranged on the upper surface of the base at a position below the connecting seat, and the output end of the cylinder is connected to a rubber shock absorber.

[0011] Preferably, at least two groups of symmetrically distributed clamping seats are provided on the upper surface of the base, and the specimen cup is provided between the two groups of the clamping seats;

[0012] Liquid oxygen is placed inside the test piece cup.

[0013] Preferably, one end of the striker is inserted into the interior of the specimen cup, and a matching clamping plate is sleeved on the end of the striker away from the specimen cup;

[0014] Both ends of the clamping plate are threadedly provided with matching first fixing bolts, and one end of each of the first fixing bolts away from the clamping plate is threadedly connected to the inside of the corresponding clamping seat;

[0015] The striker is fixed inside the specimen cup through the cooperation of the clamping plate, the clamping seat and the first fixing bolt.

[0016] Preferably, at least two groups of symmetrically distributed guide rods are fixedly arranged on the upper end surface of the base at positions corresponding to the weights, and the outer surface of each guide rod is sleeved with a matching guide cylinder;

[0017] The two ends of the connecting seat are respectively connected to the guide cylinders, and the connecting seat reciprocates above the striker through the cooperation of the guide cylinders and the guide rods;

[0018] The weight is fixedly arranged below the connection seat, and a matching hook is fixedly arranged at a position on the upper surface of the connection seat corresponding to the weight.

[0019] Preferably, matching fixing seats are fixedly provided at both end positions of the upper end surface of the base corresponding to the connecting seat, and a matching cylinder is provided on the upper end surface of each fixing seat, and a matching second fixing bolt is threadedly provided between the cylinder and the fixing seat.

[0020] Preferably, a matching rubber shock absorber is provided on the sliding sleeve at the output end of the cylinder, and a matching adjusting bolt is threadedly provided on the outer surface of the output end of the cylinder at a position corresponding to the lower end surface of the rubber shock absorber.

[0021] Preferably, the cylinder is electrically connected to a matching solenoid valve, and the solenoid valve is electrically connected to a control gas and a control console;

[0022] The lower limit switch is electrically connected to the control console.

[0023] To solve the above technical problem, according to another aspect of the present invention, the present invention provides the following technical solution:

[0024] A method for preventing a liquid oxygen impact tester's heavy hammer from rebounding and falling back to impact a test piece for the second time, using the above-mentioned device for preventing a liquid oxygen impact tester's heavy hammer from rebounding and falling back to impact a test piece for the second time, comprising the following steps:

[0025] S1. Place the sample into the specimen cup and then fill the specimen cup with liquid oxygen;

[0026] S2, release the hammer, the 10kg hammer will fall freely along the guide rod from a height of 1m, generating an impact energy equivalent to 98J;

[0027] S3, the heavy hammer is in full contact with the striker;

[0028] S4, the downward sliding connection seat will trigger the lower limit switch, and then the connection seat triggers the signal;

[0029] S5, the console receives the trigger signal and sends a signal to the solenoid valve after a delay of 30~70ms;

[0030] S6, the solenoid valve controls the air to change direction, the piston rod in the cylinder extends, and the rubber shock absorber moves upward;

[0031] S7: At this point, the heavy hammer has just completed a complete impact, and then rebounds;

[0032] S8, the rubber shock absorber pushes the connecting seat upwards to prevent the heavy hammer from falling again due to gravity, thus preventing the heavy hammer from contacting the striker again;

[0033] S9, the lifting mechanism drops down to connect the hook and lifts up the heavy hammer;

[0034] S10, the control console sends a signal to the solenoid valve, the solenoid valve controls the air to change direction, the piston rod in the cylinder is retracted, and the rubber shock absorber is driven to reset;

[0035] S11. Disassemble the striker, take out the test piece, observe and record;

[0036] S12. Install the test piece, install the striker, and repeat the entire process.

[0037] The beneficial effects of the present invention are as follows:

[0038] The present invention provides a device and method for preventing a weight of a liquid oxygen impact test machine from rebounding and falling back to impact a test piece for the second time. A weight that falls freely impacts a striker. When the striker is impacted by the weight, the test piece placed in the test piece cup is impacted by the striker. The impact simulates the test piece being impacted in a liquid oxygen environment. When a connecting seat drives the weight to move down along a guide rod and impact, a lower limit switch is synchronously triggered to send a signal. After receiving the signal, a control console sends a signal to a solenoid valve. The solenoid valve controls the air to change direction. The cylinder pushes out a rubber shock absorber. After the weight that impacts the striker is rebounded and lifted up, it falls again due to the effect of its weight. At this time, it will be stopped from falling by the rising rubber shock absorber, thereby achieving the purpose of preventing the weight from rebounding and falling back to impact the test piece for the second time. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0040] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0041] Figure 2 It is a schematic diagram of the connection between the striker and the heavy hammer structure of the present invention;

[0042] Figure 3 for Figure 2 A schematic diagram of the structure enlargement in the middle;

[0043] Figure 4 It is a schematic diagram of the structural connection between the cylinder and the rubber shock absorber of the present invention.

[0044] In the figure: base 1, striker 2, weight 3, lower limit switch 4, cylinder 5, fixing rod 6, connecting seat 7, guide cylinder 8, hook 9, specimen cup 10, liquid oxygen 11, clamping plate 12, first fixing bolt 13, clamping seat 14, fixing seat 15, second fixing bolt 16, adjusting bolt 17, rubber shock absorber 18, guide rod 19.

[0045] The realization of the effects, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0046] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0048] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0049] Embodiment 1:

[0050] See also Figures 1 to 4 The present invention provides a technical solution: a device to prevent the rebound of the weight of the liquid oxygen impact tester from causing a secondary impact on the test piece, comprising:

[0051] A base 1, wherein a matching specimen cup 10 is disposed on the upper surface of the base 1, and a matching striker 2 is disposed above the specimen cup 10;

[0052] A connecting seat 7 is slidably arranged above the base 1, and a matching heavy hammer 3 is arranged at a position above the striker 2 corresponding to the lower end surface of the connecting seat 7;

[0053] A fixing rod 6 is arranged on the upper surface of the base 1, and a matching lower limit switch 4 is arranged on the outer surface of the fixing rod 6 at a position corresponding to the connecting seat 7;

[0054] The cylinder 5 is arranged on the upper surface of the base 1 at a position below the connecting seat 7, and the output end of the cylinder 5 is connected to a rubber shock absorber 18;

[0055] The sliding connection seat 7 drives the heavy hammer 3 to hit the striker 2 inside the specimen cup 10. When the striker 2 is hit, the specimen placed at the bottom of the specimen cup 10 will be hit by the striker 2, thereby simulating the impact of the specimen in a liquid oxygen environment. When the sliding connection seat 7 triggers the lower limit switch 4, the lower limit switch 4 controls the output end of the cylinder 5 to drive the rubber shock absorber 18 to lift, thereby limiting the heavy hammer 3 that hits the striker 2 and is rebounded and lifted.

[0056] Embodiment 2:

[0057] like Figure 2-Figure 3 As shown, the device disclosed in the second embodiment of the present invention for preventing the rebound of the weight of the liquid oxygen impact tester and the secondary impact on the test piece is basically the same in structure as that in the first embodiment, except that:

[0058] The upper surface of the base 1 is provided with at least two groups of symmetrically distributed clamping seats 14, and the specimen cup 10 is arranged between the two groups of the clamping seats 14;

[0059] Liquid oxygen 11 is placed inside the test piece cup 10;

[0060] One end of the striker 2 is inserted into the interior of the specimen cup 10, and a matching clamping plate 12 is sleeved on the end of the striker 2 away from the specimen cup 10;

[0061] Both ends of the clamping plate 12 are screwed with matching first fixing bolts 13, and one end of each first fixing bolt 13 away from the clamping plate 12 is screwed into the inside of the corresponding clamping seat 14;

[0062] The striker 2 is fixed inside the specimen cup 10 through the cooperation of the clamping plate 12, the clamping seat 14 and the first fixing bolt 13;

[0063] At least two groups of symmetrically distributed guide rods 19 are fixedly provided on the upper end surface of the base 1 at positions corresponding to the weight 3, and the outer surface of each guide rod 19 is sleeved with a matching guide cylinder 8;

[0064] The two ends of the connecting seat 7 are respectively connected to the guide cylinders 8, and the connecting seat 7 reciprocates above the striker 2 through the cooperation of the guide cylinders 8 and the guide rods 19;

[0065] The weight 3 is fixedly arranged below the connection seat 7, and a matching hook 9 is fixedly arranged at a position on the upper surface of the connection seat 7 corresponding to the weight 3;

[0066] The striker 2 is struck by the free-falling weight 3. When the striker 2 is struck by the weight 3, the specimen placed in the specimen cup 10 is struck by the striker 2. The impact simulates the impact of the specimen in a liquid oxygen environment.

[0067] Embodiment three:

[0068] like Figure 4 As shown, the device and method for preventing the rebound of the weight of the liquid oxygen impact tester and the secondary impact on the test piece disclosed in the third embodiment of the present invention is basically the same as that in the second embodiment, except that:

[0069] Matching fixing seats 15 are fixedly arranged at the upper end surface of the base 1 corresponding to the two end positions of the connecting seat 7, and a matching cylinder 5 is arranged on the upper end surface of each fixing seat 15, and a matching second fixing bolt 16 is screwed between the cylinder 5 and the fixing seat 15;

[0070] The output end sliding sleeve of the cylinder 5 is provided with a matching rubber shock absorber 18, and the outer surface of the output end of the cylinder 5 is threadedly provided with a matching adjusting bolt 17 at a position corresponding to the lower end surface of the rubber shock absorber 18;

[0071] The cylinder 5 is electrically connected to a matching solenoid valve, and the solenoid valve is electrically connected to a control gas and a control console;

[0072] The lower limit switch 4 is electrically connected to the console;

[0073] When the connecting seat 7 drives the heavy hammer 3 to move down along the guide rod 19 and hit, the lower limit switch 4 is triggered synchronously to send a signal. After receiving the signal, the control console sends a signal to the solenoid valve. The solenoid valve controls the air direction change, and the cylinder 5 pushes out the rubber shock absorber 18. After the heavy hammer 3 that hits the striker 2 is rebounded and lifted up, it falls again due to the effect of weight. At this time, it will be prevented from falling by the rising rubber shock absorber 18.

[0074] When the present invention is used, the sample is placed in the specimen cup 10, and then the specimen cup 10 is filled with liquid oxygen 11, and then the weight 3 is released, and the 10kg weight 3 will fall freely from a height of 1m along the guide rod 19, generating an energy impact equivalent to 98J, and then under the action of gravity, the weight 3 is completely in contact with the striker 2, and at the same time, the sliding connection seat 7 will trigger the lower limit switch 4, and then the connection seat 7 triggers the signal, the console receives the trigger signal, and sends a signal to the solenoid valve after a delay of 30-70ms, the solenoid valve controls the air to change direction, and the piston rod in the cylinder 5 extends, driving the rubber shock absorber 18 to move upward, at this time the weight 3 just completes a complete impact, and then the weight 3 rebounds;

[0075] The rubber shock absorber 18 pushes up the connecting seat 7, preventing the heavy hammer 3 from falling again due to gravity, and preventing the heavy hammer 3 from contacting the striker 2 again. The hook 9 is lowered through the lifting mechanism to lift the heavy hammer 3. The control console sends a signal to the solenoid valve, and the solenoid valve controls the air to change direction. The piston rod in the cylinder 5 is retracted, driving the rubber shock absorber 18 to reset, remove the striker 2, take out the test piece, observe and record, install the test piece, install the striker 2, and repeat the whole process.

[0076] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A device to prevent the weight of a liquid oxygen impact tester from rebounding and falling back to impact the test piece for the second time, characterized in that: include: A base (1), wherein a matching specimen cup (10) is arranged on the upper surface of the base (1), and a matching striker (2) is arranged above the specimen cup (10); A connecting seat (7) is slidably arranged above the base (1), and a matching heavy hammer (3) is arranged at a position above the striker (2) corresponding to the lower end surface of the connecting seat (7); A fixing rod (6) is arranged on the upper surface of the base (1), and a matching lower limit switch (4) is arranged on the outer surface of the fixing rod (6) at a position corresponding to the connecting seat (7); The cylinder (5) is arranged on the upper surface of the base (1) at a position below the connecting seat (7), and the output end of the cylinder (5) is connected to a rubber shock absorber (18).

2. The device for preventing the rebound of the weight of the liquid oxygen impact tester from causing a secondary impact on the test piece according to claim 1 is characterized in that: The upper surface of the base (1) is provided with at least two groups of symmetrically distributed clamping seats (14), and the specimen cup (10) is arranged between the two groups of clamping seats (14); Liquid oxygen (11) is placed inside the test piece cup (10).

3. The device for preventing the weight of the liquid oxygen impact tester from rebounding and falling back to impact the test piece for the second time according to claim 2, characterized in that: One end of the striker (2) is inserted into the interior of the specimen cup (10), and a matching clamping plate (12) is sleeved on the end of the striker (2) away from the specimen cup (10); Both ends of the clamping plate (12) are screwed with matching first fixing bolts (13), and one end of each of the first fixing bolts (13) away from the clamping plate (12) is screwed into the inside of the corresponding clamping seat (14); The striker (2) is fixed inside the specimen cup (10) through the cooperation of the clamping plate (12), the clamping seat (14) and the first fixing bolt (13).

4. The device for preventing the rebound of the weight of the liquid oxygen impact tester from causing secondary impact on the test piece according to claim 3 is characterized in that: At least two groups of symmetrically distributed guide rods (19) are fixedly arranged on the upper end surface of the base (1) at positions corresponding to the weights (3), and a matching guide cylinder (8) is sleeved on the outer surface of each guide rod (19); The two ends of the connecting seat (7) are respectively connected to the guide cylinders (8), and the connecting seat (7) reciprocates above the striker (2) through the cooperation between the guide cylinders (8) and the guide rods (19); The weight (3) is fixedly arranged below the connection seat (7), and a matching hook (9) is fixedly arranged on the connection seat (7) at a position on the upper surface corresponding to the weight (3).

5. The device for preventing the rebound of the weight of the liquid oxygen impact tester from causing secondary impact on the test piece according to claim 1, characterized in that: Matching fixing seats (15) are fixedly arranged at the upper end surface of the base (1) at the two end positions corresponding to the connecting seat (7), and a matching cylinder (5) is arranged on the upper end surface of each fixing seat (15), and a matching second fixing bolt (16) is threadedly arranged between the cylinder (5) and the fixing seat (15).

6. The device for preventing the weight of the liquid oxygen impact tester from rebounding and falling back to impact the test piece for the second time according to claim 5, characterized in that: The output end sliding sleeve of the cylinder (5) is provided with a matching rubber shock absorber (18), and a matching adjusting bolt (17) is threadedly provided on the outer surface of the output end of the cylinder (5) at a position corresponding to the lower end surface of the rubber shock absorber (18).

7. The device for preventing the weight of the liquid oxygen impact tester from rebounding and falling back to impact the test piece for the second time according to claim 6, characterized in that: The cylinder (5) is electrically connected to a matching solenoid valve, and the solenoid valve is electrically connected to a control gas and a control console; The lower limit switch (4) is electrically connected to the control console.

8. A method for preventing the rebound of the weight of a liquid oxygen impact tester from causing a secondary impact on a test piece, characterized in that: The device for preventing the rebound of the weight of the liquid oxygen impact tester and the secondary impact on the test piece as described in any one of claims 1 to 7 comprises the following steps: S1. Place the sample into a test cup (10), and then fill the test cup (10) with liquid oxygen (11); S2, release the weight (3), the 10kg weight (3) will fall freely from a height of 1m along the guide rod (19), generating an impact energy equivalent to 98J; S3, the heavy hammer (3) is in full contact with the striker (2); S4, the lowered connecting seat (7) triggers the lower limit switch (4), and then the connecting seat (7) triggers the signal; S5, the console receives the trigger signal and sends a signal to the solenoid valve after a delay of 30~70ms; S6, the solenoid valve controls the air to change direction, the piston rod in the cylinder (5) extends, and the rubber shock absorber (18) moves upward; S7, at this time, the heavy hammer (3) just completes a complete impact, and then the heavy hammer (3) rebounds; S8, the rubber shock absorber (18) pushes the connecting seat (7) upward to prevent the heavy hammer (3) from falling again due to gravity, thereby preventing the heavy hammer (3) from contacting the striker (2) again; S9, the lifting mechanism drops the hook (9) and lifts the heavy hammer (3); S10, the control console sends a signal to the solenoid valve, the solenoid valve acts to control the air to change direction, the piston rod in the cylinder (5) is retracted, and the rubber shock absorber (18) is driven to reset; S11. Disassemble the striker (2), take out the test piece, observe and record; S12, install the test piece, install the striker (2), and repeat the whole process.

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