CN220288950U - Large pulse width high energy impact testing machine - Google Patents

Abstract

The utility model relates to a large pulse width high energy impact tester, which comprises a foundation-free damping device, wherein a cavity energy applying device, a sliding device and a large pulse width waveform generator are arranged on the foundation-free damping device, the sliding device is positioned between the cavity energy applying device and the large pulse width waveform generator, an impact table top is connected to the sliding device in a sliding manner, one end of the cavity energy applying device is opposite to one end of the impact table top and provides impact force for the impact table top, the large pulse width waveform generator is opposite to the other end of the impact table top and receives the impact force, the cavity energy applying device comprises a cavity, an impact piston is sleeved in the cavity, a pressure source for providing low pressure gas for the cavity is connected to the cavity, and during test, the impact piston is excited to impact the impact table top surface by the pressure source with different sizes to impact the large pulse width waveform generator according to different impact energies. The utility model uses the air cannon principle for reference and simulation, has larger impact energy, can meet the impact test requirements of high acceleration and large pulse width, and expands the laboratory test capability.

Description

Large pulse width high energy impact testing machine

Technical Field

The utility model relates to the technical field of high-pulse-width high-energy impact tests, in particular to a high-pulse-width impact test machine.

Background

The impact test is the most common test except vibration in mechanical tests, and is an indispensable component in the examination of various stages such as bottoming, acceptance and identification. Impact types are also varied and we have seen that the usual impact waveforms are half sine wave, trailing sawtooth wave, trapezoidal wave, decaying sine wave, impact response spectrum, etc. Conventional magnitude impact tests can be accomplished using dedicated impact equipment, impact tables or electric tables, but when the impact acceleration is excessive (not less than 3000 g) or the pulse duration is too long (not less than 40 ms), or high energy impact (example: 60g,40ms;1000g,10ms;3000g,10 ms), the conventional impact test equipment is disabled and special dedicated test equipment is required.

For example: (1) for the requirement that the impact acceleration A is more than or equal to 3000g, a special device is addedAn initial velocity V is given to the common impact equipment ₀ The impact energy of the table top is further increased (aiming at the table top), so that the table top can generate larger impact acceleration A when striking the same waveform generator; or, the impact amplifier is arranged on the original impact table top in an auxiliary way, the impact acceleration A can reach 20000g, but the pulse width is very limited, generally only 0.1 ms-2 ms, the specification of the sample cannot be more than 200mm multiplied by 200mm, the sample is inconvenient to replace in the installation direction, and meanwhile, the axial reverse impact fixing difficulty is high.

(2) The maximum pulse width of the natural rubber pier waveform generator commonly used for common impact equipment can only reach about 35ms, and when the required pulse width D is more than or equal to 40ms, 2 foam plates with the thickness of 5mm can be padded on the natural rubber pier waveform generator, so that the pulse width reaches 41ms. However, the simple operation firstly can eject the foam board at the moment of impact, and secondly, the foam board can break, delaminate or be compacted to lose elasticity after being impacted for two times, so that the repeatability of the test is not ensured.

(3) If a high energy impact test is desired (e.g., 60g,40ms, 1000g,10ms, 3000g,10 ms), it means that the impact acceleration A and the pulse duration D are increased in a uniform amount, i.e., the impact test apparatus must be provided with a primary velocity V that can bring the impact table to a high level ₀ The initial kinetic energy is obtained sufficiently, and meanwhile, the waveform generator needs to be adjustable in hardness and in an adjustable range of about 5ms to 60ms.

At present, only two laboratories of Beijing and Suzhou have the capability of high-energy impact test, the rate is 5000 yuan/time, and for the conventional requirement of '3 axial six directions 3 times per direction', the test cost of 18 times is up to 90000 yuan, and the cost of common impact test is about 100 yuan at a time. It is known that the rate of the test is high, the user is overwhelmed, the cost is high because the equipment is purchased and input once, the material consumption and maintenance cost are high in the later period (the types of matched waveform generators are many and the replacement frequency is high), and if the receiving task is not excessive, the investment cost return period is too long.

Disclosure of Invention

In order to solve the technical problems, the utility model aims to provide a large pulse width high energy impact testing machine which uses an air cannon principle and an air bag shock absorption foundation-free device as a support and has the advantages of large impact energy, simple structure and low cost.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

a large pulse width high energy impact testing machine is characterized in that: the device comprises a foundation-free damping device, a cavity energy applying device, a sliding device and a large pulse width waveform generator are arranged on the foundation-free damping device, the sliding device is located between the cavity energy applying device and the large pulse width waveform generator, an impact table top is connected to the sliding device in a sliding mode, one end of the cavity energy applying device and one end of the impact table top are oppositely arranged and provide impact force for the impact table top, the large pulse width waveform generator and the other end of the impact table top are oppositely arranged and receive the impact force, the cavity energy applying device comprises a cavity, an impact piston is sleeved in the cavity, a pressure source for providing low-pressure air in the cavity is connected to the cavity, and during a test, the cavity excites the impact piston to impact the impact table top through the pressure source with different sizes to impact the large pulse width waveform generator according to different impact energies.

Further, a resetting device is further arranged on the foundation-free damping device, two sides of the large pulse width waveform generator are provided with the resetting device, and one end of the resetting device is in sliding connection with the impact table top; the impact table top after impact is driven by the reset device to restore to the initial moving position on the sliding device.

Further, the cavity is further provided with an accumulation air inlet, an accumulation air outlet and a punch return air inlet/outlet, the cavity is internally sleeved with a cylinder body, the cylinder body is respectively communicated with the accumulation air inlet, the accumulation air outlet and the punch return air inlet/outlet, the impact piston is nested at one end in the cylinder body, the other end in the cylinder body is provided with a brake, and the brake is located at the tail end of the cylinder body and opposite to the impact piston.

Further, the sliding device comprises a table top sliding rail, the table top sliding rail is arranged on the foundation-free damping device, and the table top sliding rail is resisted with the impact table top; the lower part of the impact table top is provided with a brake module, and the brake module and the table top sliding rail are used for braking.

Further, the impact table top is a sample installation table top, one end of the sample installation table top is connected with a steel punch used for impacting the large pulse width waveform generator, the other end of the sample installation table top is connected with a steel pushing plate used for increasing the impact surface of the piston, the lower end of the sample installation table top is provided with a mounting frame, a shaft sleeve is sleeved on a table top sliding rail in a sliding mode, and the shaft sleeve is connected with the mounting frame.

Further, the foundation-free damping device is further provided with an impact bearing wall, the large pulse width waveform generator is fixed on the impact bearing wall, the impact bearing wall comprises a main bearing wall and a supporting plate, the main bearing wall is connected to the foundation-free damping device, and the supporting plate is respectively connected to two sides and the middle position of the main bearing wall and is connected with the foundation-free damping device.

Further, the large pulse width waveform generator comprises a front rubber pier, a moving piston base, an oil storage cylinder body and an energy absorbing device, wherein the oil storage cylinder body is fixed on the impact bearing wall, the moving piston base is arranged in the oil storage cylinder body, and the bottom of the front rubber pier is connected to the moving piston base; the energy absorbing device comprises a flange and a rubber bag, one end of the flange is arranged on the impact bearing wall, the other end of the flange is provided with the rubber bag, and the rubber bag is communicated with the oil storage cylinder body.

Further, the resetting device comprises a resetting cylinder arranged on the foundation-free damping device, the two sides of the large pulse width waveform generator are respectively provided with the resetting cylinder, a cylinder push rod sleeved at the front end of the resetting cylinder is respectively blocked with the lower part of the impact table top, and after the impact table top completes the impact action, the resetting cylinder pushes the cylinder push rod to pop up to push the impact table top to reset.

Further, infrared protection devices are arranged on two sides of the impact table top and comprise infrared gratings, and the infrared gratings are arranged from the initial position of the impact table top to the outside of the impact bearing wall; and in the test, the straight line position projected by the infrared grating is triggered to stop when being touched by an object.

Further, exempt from ground damping device includes supporting baseplate, mesa bottom plate, automobile damper, hydraulic damper, V type mounting panel and shock attenuation gasbag, automobile damper one end is installed mesa bottom plate bottom both sides, the automobile damper other end is installed supporting baseplate top both ends, V type mounting panel is relative and the wrong distribution be in mesa bottom plate with supporting baseplate top, the upside V type mounting panel both sides respectively with hydraulic damper one end is connected, the hydraulic damper other end is connected the supporting baseplate top, shock attenuation gasbag extrusion upside V type mounting panel and downside between the inclined plane of V type mounting panel.

Compared with the prior art, the utility model has the following effects:

(1) The high-pulse-width high-energy impact testing machine provided by the utility model has the advantages that the cavity enabling device uses the simulated air cannon principle, low-pressure air is used as main power, the large impact energy is realized, the impact acceleration peak value and the pulse duration of the impact piston in the cavity are controlled by electrically and automatically controlling the impact air pressure and the pulse oil pressure, the high-pulse high-energy impact testing is realized, the technical capability range of the impact testing of the testing room is expanded, the industrial competitiveness of the testing room is enhanced, the testing room becomes a third-party testing room capable of completing high-energy impact by the northwest first family, the market precedent is occupied, and the economic benefit is increased.

(2) The utility model provides a large pulse width high energy impact testing machine, wherein a large pulse width waveform generator can generate a maximum pulse width of 60ms by replacing a front rubber pier and adjusting the oil pressure filled in an oil storage cylinder; in the impact test, the impact acceleration peak value A and the pulse duration time D can be controlled by automatically controlling the charging impact air pressure and the pulse oil pressure according to the conventional debugging record, so that the impact test with large pulse high energy (for example, half sine wave 60g,40ms, 1000g,10ms, 3000g,10 ms) is realized.

(3) The impact testing machine can perform half sine wave impact test and post peak sawtooth wave impact test, and can be realized by only performing electric conversion and starting an energy absorbing device arranged behind a large pulse width waveform generator. Compared with a vertical impact device, the impact direction of the utility model is a horizontal direction, so that the test sample is convenient to replace in the installation direction of the sample when the test sample is impacted in the three-axis six directions, the difficulty and complexity of axial reverse impact fixation are avoided, and the centering placement of optical test equipment in certain types of tests is facilitated.

Drawings

FIG. 1 is a schematic diagram of a large pulse high energy impact tester of the present utility model.

Fig. 2 is a schematic diagram of an infrared protection device according to the present utility model.

FIG. 3 is a schematic diagram of an external oil source according to the present utility model.

Fig. 4 is a schematic view of a control panel according to the present utility model.

Fig. 5 is a schematic diagram of a control circuit according to the present utility model.

Reference numerals illustrate:

1-cavity energy application device, 11-cavity; 12-an accumulator inlet; 13-a brake interface; 14-an accumulator vent; 15-first pressure sensor; 16-resetting the punch head to an air inlet/outlet; 17-an impulse piston; 18-braking; 19-a cylinder; a 20-nylon pad;

2-an infrared protection device; 201-proximity sensor one; 202-a second proximity sensor; 203-proximity sensor three; 204—proximity sensor four; 205-an infrared grating; 206-a bracket;

3-impacting the table top; 31-steel punch; 32-a steel push plate; 33-a brake module; 34-sample mesa;

4-a large pulse width waveform generator; 41-moving the piston base; 42-prepositioned rubber piers; 43-an oil storage cylinder; 44-an energy absorbing device; 441-flange; 442-acorn capsules; 443-high pressure solenoid valve one; 45-a second pressure sensor; 46-an accumulator port; 47-relief vent; 48-a second high-pressure electromagnetic valve;

5-sliding devices, 51-table top sliding rails; 52-shaft sleeve;

6-impacting the load bearing wall; 61-main load-bearing wall; 62-a support plate;

7-resetting devices, 73-resetting cylinders; 71-cylinder push rod; 72-magnetic switch;

8-a foundation-free damping device; 81-supporting a base plate; 82-footing; 83-an automotive shock absorber; 84-hydraulic shock absorber; an 85-V mounting plate; 86-a shock absorbing balloon; 87-table top base.

Detailed Description

The present utility model will be described in detail with reference to the accompanying drawings.

As shown in fig. 1-3. The embodiment of the utility model provides a large pulse width high energy impact testing machine, which comprises a foundation-free damping device 8, wherein a cavity energy applying device 1, a sliding device 5 and a large pulse width waveform generator 4 are arranged on the foundation-free damping device 8, the sliding device 5 is positioned between the cavity energy applying device 1 and the large pulse width waveform generator 4, an impact table top 3 is connected on the sliding device 5 in a sliding way, one end of the cavity energy applying device 1 is opposite to one end of the impact table top 3 and provides impact force for the impact table top 3, the large pulse width waveform generator 4 is opposite to the other end of the impact table top 3 and receives the impact force, two sides of the large pulse width waveform generator 4 are provided with a reset device 7, and one end of the reset device 7 is abutted against the impact table top 3; during the test, the cavity energy applying device 1 impacts the impact table top 3 loaded with the sample, axially moves along the sliding device 5 to impact the large pulse width waveform generator 4, and the impacted impact table top 3 is driven by the reset device 7 to restore to the initial moving position on the sliding device 5.

Specifically, the foundation-free damping device 8 is arranged on the ground, the foundation-free damping device 8 is adopted, the complicated construction foundation cost and the complicated construction foundation cost of the foundation can be avoided, the device is more convenient to install, the top of the foundation-free damping device 8 is a table-board bottom board 87, and the cavity energy applying device 1, the sliding device 5, the large pulse width waveform generator 4 and the resetting device 7 are all connected and fixed on the table-board bottom board 87. The energy implementation main body of the cavity energy application device 1 is located at one end edge of a table top bottom plate 87, the impact table top 3 is connected to the table top bottom plate 87 through a sliding device 5, the impact table top 3 is used as an impact main body and is mainly used for installing test samples, the impact table top 3 is located on the left side of the cavity energy application device 1, a large pulse width waveform generator 4 is arranged on the right side of the impact table top 3, the large pulse width waveform generator 4 is fixed to the table top bottom plate 87 through an impact bearing wall 6, and the reset device 7 is fixedly connected to the right side of the table top bottom plate 87. The cavity energy applying device 1, the impact table top 3 and the large pulse width waveform generator 4 are positioned on the same horizontal line. The resetting devices 7 are respectively arranged at two sides of the large pulse width waveform generator 4, and the left end part of the resetting device 7, which extends out, resists the lower part of the impact table top 3.

Further, the cavity energy applying device 1 includes a cavity 11, an impact piston 171 is sleeved in the cavity 11, a pressure source for providing low pressure air for the cavity 11 is connected to the cavity 11, and the cavity 11 excites the impact piston to impact the impact table top 3 through the pressure source with different sizes to impact the large pulse width waveform generator 4 according to different impact energy.

Specifically, the material of cavity 11 is steel, cavity 11 is formed by the continuous welding of every two same 6 steel sheets, cavity 11 sets up mesa bottom plate 87 one end edge, transversely overlap in the cavity 11 and be equipped with impact piston 17, and cavity 11 is connected with the oil inlet, the oil-out of external oil source through pressure accumulation, pressure release solenoid valve, and the used oil pipe size of oil source oil inlet is the twice of oil-out, fills the low-pressure gas of different pressures into cavity 11 by electric control, is as the main power that promotes impact piston 17.

Further, the cavity 11 is provided with an accumulated air inlet 12, an accumulated air outlet 14 and a punch return air inlet/outlet 16, a cylinder 19 is sleeved in the cavity 11, the cylinder 19 is respectively communicated with the accumulated air inlet 12, the accumulated air outlet 14 and the punch return air inlet/outlet 16, the impact piston 17 is nested at one end in the cylinder 19, the other end in the cylinder 19 is provided with a brake module 18, and the brake module 18 is located at the tail end of the cylinder and opposite to the impact piston 17.

Specifically, the cavity 11 is further provided with a brake holding port 13 and a first pressure sensor 15, the cylinder 19 is respectively connected with the pressure accumulation air inlet 12, the pressure accumulation air outlet 14, the first pressure sensor 15 and the punch return air inlet/outlet 16, the impact energy depends on the pressure of low-pressure air filled into the cavity 11, the measurement of the filling pressure is controlled by the first pressure sensor 15, and the maximum pressure of the low-pressure air which can be provided by a test room is 1.2MPa. Can easily meet the current requirement (3000 g,10 ms) of the impact test with the largest large pulse and high energy.

Preferably, with an understanding of the structure and principles of existing impact test equipment, air cannons are the most common prior art, an impact means that provides greater impact energy.

The front end of the impact piston 17 is connected with the cylinder body 19 through a copper sleeve, the rear end of the impact piston 17 is attached to the cylinder body 19 through 2 sealing rings, the brake holding module 18 is located at the tail end of the impact piston 17, the brake holding module 18 is made of an upper semicircular polyester composite material and a lower semicircular polyester composite material, the brake holding module 18 is connected with the brake holding interface 13, and the power of the brake holding module 18 is converted into oil pressure with pressure of 1.5MPa through a special external module by applying pressure of 0.4MPa, so that the brake holding module 18 generates larger hoop force. After the brake module releases the brake, the brake module 18 is quickly separated from the hoop surface of the impact piston by a tension spring in the brake module. And the front end of the impact piston 17 is also wrapped with a nylon cushion 20. The nylon cushion 20 can increase the contact surface of the impact piston 17 with the impact table.

When low-pressure air is filled into the cavity 11 through electrical control, the braking module 18 is released first to enable the impact piston 17 to pop up under the action of air pressure, so that the impact table top 3 is pushed to impact the large pulse width waveform generator 4 quickly, larger impact acceleration and larger pulse duration are generated, and the requirement of a large-pulse high-energy impact test is met.

Further, the sliding device 5 comprises a table top sliding rail 51, the table top sliding rail 51 is arranged on the foundation-free damping device 8, and the table top sliding rail 51 is in sliding connection with the impact table top 3; the lower part of the impact table top 3 is provided with a braking module 33 and a table top sliding rail 51 for braking.

Specifically, the impact table 3 is mainly used for mounting test samples as a main body of impact, and the number of the table slide rails 51 comprises at least 2 parallel and spaced-apart. Two braking modules 33 are arranged at the middle position of the lower part of the impact table top 3, the braking modules 33 are sleeved on the table top sliding rail 51, and the braking modules 33 brake the impact table top 3 by braking the table top sliding rail 51, so that the impact table top 3 is prevented from rebounding to generate secondary impact after impacting the large pulse width waveform generator 4.

Further, the impact table 3 includes a sample table 34, and the sample table 34 is a sample mounting table. One end of the sample table 34 is connected with a steel punch 31 for striking the large pulse width waveform generator 4, the other end of the sample table 34 is connected with a steel pushing plate 32 for enlarging the impact surface of the piston, the lower end of the sample table 34 is provided with a mounting frame, a shaft sleeve 52 is sleeved on the table slide rail 51 in a sliding way, and the shaft sleeve 52 is connected with the mounting frame.

Specifically, the specimen table 34 is mounted on a pair of table slide rails 51 by 4 bushings 52 and 2 mounts. The shaft sleeve 52 is sleeved on the table top sliding rail 51, the mounting frame is mounted and fixed on the shaft sleeve, the upper end of the mounting frame is connected with the sample table top 34, and the sample table top 34 is in sliding fit with the table top sliding rail 51 through the shaft sleeve. The sample table 34 is made of hard aluminum with the size of 600mm multiplied by 600mm, the steel punch 31 at the front end of the sample table 34 is used for striking the large pulse width waveform generator 4 to generate impact acceleration peak value and pulse duration, and the steel pushing plate 32 at the rear end of the sample table 34 is used for increasing the contact surface between the nylon pad at the front end of the impact piston and the impact table 3.

Further, the foundation-free damping device 8 is further provided with an impact bearing wall 6, the large pulse width waveform generator 4 is fixed on the impact bearing wall 6, the impact bearing wall 6 comprises a main bearing wall 61 and a supporting plate 62, the main bearing wall 61 is connected to the foundation-free damping device 8, and the supporting plate 62 is respectively connected to two sides and the middle position of the main bearing wall 61 and is connected with the foundation-free damping device 8.

Specifically, the large pulse width waveform generator 4 is mounted on the impact load wall 6 by screwing. The impact load-bearing wall 6 is welded to the table-board bottom plate 87 of the foundation-free damping device 8. The impact bearing wall 6 is preferably made of steel, the impact bearing wall 6 is composed of a main bearing wall 61 with the thickness of 50mm and three supporting plates 62 with the thickness of 20mm, the main bearing wall 61 is welded on the table-board base plate 87, and the supporting plates 62 are respectively welded at two sides and the middle position of the main bearing wall 61 and are welded with the table-board base plate 87.

Further, the large pulse width waveform generator 4 comprises a front rubber pier 42, a moving piston base 41, an oil storage cylinder 43 and an energy absorbing device 44, wherein the oil storage cylinder 43 is fixed on the impact bearing wall 6, the moving piston base 41 is arranged in the oil storage cylinder 43, the bottom of the front rubber pier 42 is connected to the moving piston base 41 through an adhesive aluminum plate, and the energy absorbing device 44 is connected with the oil storage cylinder 43 through an oil passing channel; the energy absorbing device 44 includes a flange 441 and a rubber bag 442, the energy absorbing device 44 is mounted on the impact bearing wall 6 through the flange 441, the rubber bag 442 is disposed at the end of the energy absorbing device 44, and the rubber bag 442 is communicated with the oil storage cylinder 43.

Specifically, the oil storage cylinder body 43 is fixed on the impact bearing wall 6, hydraulic oil is filled in the oil storage cylinder body 43, the moving piston base 41 is installed in the oil storage cylinder body 43 through a copper sleeve, the rear end of the moving piston base 41 is sealed with the oil storage cylinder body 43 through two sealing rings, hydraulic oil is prevented from exuding when moving under the impact action, the bottom of the front rubber pier 42 is adhered to an aluminum plate which is 10mm thick and is provided with threads on the side surface, the front rubber pier 42 is connected on the moving piston base 41 through the aluminum plate, and the front rubber pier 42 comprises two rubber piers with hardness of Shore hardness 45 and Shore hardness 67 and a polyurethane pier, so that the impact test (5 ms-25 ms) with small pulse width can be met.

The energy absorbing device 44 is connected with the oil storage cylinder 43 through an oil passage, the rubber bag 442 is arranged at the tail end of the energy absorbing device 44, the oil passage is provided with a first high-pressure electromagnetic valve 443, the on/off of the energy absorbing device is controlled by a second proximity sensor 202 only when the peak saw-tooth wave is impacted, and the on/off of the energy absorbing device is controlled by a wave-shaped button on the electrical control panel only when the peak saw-tooth wave is impacted. The oil storage cylinder body 43 is further provided with an accumulation opening 46 and a pressure relief opening 47, the accumulation opening 46 and the pressure relief opening 47 are respectively provided with a second high-pressure electromagnetic valve 48, and the energy absorbing device 44 is further provided with a second pressure sensor 45.

The pulse width of the large pulse width waveform generator 4 is adjusted: firstly by replacing the front rubber piers 42 and secondly by adjusting the pressure of the hydraulic oil injected into the oil reservoir cylinder 43. The pressure of the injected hydraulic oil is controlled by the second pressure sensor 45, and the smaller the pressure of the injected hydraulic oil is, the larger the pulse width is generated. The maximum oil pressure of the accumulator 43, which can be supplied to the large pulse width waveform generator 4, is 3.0MPa due to the limitation of the external oil source pressure. By debugging, when the oil pressure of 3.0MPa is charged into the oil storage cylinder 43, the minimum pulse width of the impact is about 5ms and the maximum impact acceleration is 6000g after the front rubber pier 42 is replaced by the polyurethane pier.

Further, the resetting device 7 comprises a resetting air cylinder 73 arranged on the foundation-free damping device 8, the two sides of the large pulse width waveform generator 4 are respectively provided with the resetting air cylinder 73, an air cylinder push rod 71 sleeved at the front end of the resetting air cylinder 73 is respectively blocked with the mounting frame under the impact table top 3, and after the impact table top 3 completes the impact action, the resetting air cylinder 73 pushes the air cylinder push rod 71 to pop up to push the impact table top 3 to reset.

Specifically, the number of the reset cylinders 73 is two, the cylinder length is 1m, a cylinder push rod 71 is sleeved at one side of the front end of the reset cylinder 73, which is close to the impact table top 3, and after the impact table top 3 completes the impact action, the cylinder push rod 71 of the reset cylinder 73 pops out after the brake module 33 works for 2s, so as to push the impact table top 3 to reset. The end of the reset cylinder 73 is provided with a magnetic switch 72 for resetting the reverse impact table top 3, and the cylinder push rod 71 of the reset cylinder 73 is in an extending state when not in use, so as to resist the impact table top 3 and prevent the impact table top 3 from being accidentally popped up. When the impact relief valve is closed at the beginning of use, the cylinder push rod 71 of the reset cylinder 73 is automatically retracted.

Further, infrared protection devices 2 are further arranged on two sides of the impact table top 3, the infrared protection devices 2 comprise a bracket 206 and an infrared grating 205, and the infrared protection devices 2 are arranged at the initial position of the impact table top 3 to the impact bearing wall 6; in the test, the straight line position projected by the infrared grating 206 triggers the test to stop when touched by an object. The infrared protection device 2 is used for preventing personnel from approaching accidental injury during impact.

Specifically, the infrared protection device 2 is composed of 4 sets of brackets 206 and the infrared gratings 205, and each infrared grating 205 is arranged on one side of the top end of the bracket 206. The infrared protection devices 2 are respectively placed on two sides of the impact table top in pairs to protect personnel when the impact table top moves, when any part of the personnel touches the opposite straight line position of the infrared grating 205, the impact pressure release valve is opened to exhaust, the impact action is stopped, and the personnel is protected from accidental injury during impact.

The infrared protection device 2 is arranged at the initial position of the impact table top 3 to the impact bearing wall 6, the infrared protection device 2 is sequentially provided with a fourth proximity sensor 204, a first proximity sensor 201, a second proximity sensor 202 and a third proximity sensor 203 from left to right, the fourth proximity sensor 204 is arranged at the initial position of the steel punch 31 and is used for identifying the reset state of the impact piston 17 and controlling the braking of the braking module 18, the first proximity sensor 201 is arranged at the right rear mounting frame of the impact table top 3 and is used for identifying the reset state of the impact table top 3 and providing signals for the reset of the reset cylinder 73; and a second proximity sensor 202 and a third proximity sensor 203 are arranged at the front end of the reset cylinder 73, when the impact table top 3 impacts the large pulse width waveform generator 4, the second proximity sensor 202 and the third proximity sensor 203 are triggered by the installation frame at the lower left front side of the impact table top 3, the second proximity sensor 202 mainly provides signals for controlling the start of the exhaust valve and the reset cylinder 73 which open the cavity 11 after impact, and the third proximity sensor 203 mainly provides control signals for the brake module 33 of the impact table top 3.

Further, the foundation-free damping device 8 comprises a supporting bottom plate 81, a table top bottom plate 87, automobile dampers 83, hydraulic dampers 84, V-shaped mounting plates 85 and damping air bags 86, one end of each automobile damper 83 is installed on two sides of the bottom of the table top bottom plate 87, the other ends of the automobile dampers 83 are installed on two ends of the top of the supporting bottom plate 81, the V-shaped mounting plates 85 are distributed on the bottom of the table top plate 87 and the top of the supporting bottom plate 81 in a staggered mode relatively, two sides of each V-shaped mounting plate 85 are connected with one end of each hydraulic damper 84 respectively, the other ends of each hydraulic damper 84 are connected with the top of the supporting bottom plate 81, and the damping air bags 86 are extruded on the upper side between the V-shaped mounting plates 85 and the inclined planes of the V-shaped mounting plates 85.

Specifically, the foundation-free damping device 8 is composed of two groups of damping systems, and is installed in parallel between two steel plates (the upper steel plate is a table-board bottom plate 87, and the lower steel plate is a supporting bottom plate 81) with the thickness of 30 mm. One group is a shock absorption bracket and the other group is a shock absorption air bag. The shock mount includes the car bumper shock absorber 83, and car bumper shock absorber 83 one end is installed mesa bottom plate 87 bottom both sides, the car bumper shock absorber 83 other end is installed supporting baseplate 81 top both ends, V type mounting panel 85 interior angle is 90, V type mounting panel 85 is relative and the wrong distribution be in mesa bottom plate 87 bottom with supporting baseplate 81 top, the upside V type mounting panel 85 both sides respectively with hydraulic damper 84 one end is connected, the hydraulic damper 84 other end is connected supporting baseplate 81 top, shock attenuation gasbag 86 extrusion upside V type mounting panel 85 and downside between the inclined plane of V type mounting panel 85, supporting baseplate 81 bottom edge position all around is provided with footing 82 respectively. Before use, the shock absorption air bags in the shock absorption system are filled with compressed air of about 0.2MPa, under the action of air pressure, the shock absorption air bags in the two-to-two symmetrical installation directions disperse and absorb the force transferred to the bottom plate of the impact device during impact, and the vibration amplitude of all the shock absorption air bags is limited by the automobile shock absorber and the hydraulic shock absorber.

See again fig. 3-5. The working principle of the utility model is as follows:

before the test, firstly, whether the screw connection of the acceleration sensor is firm (the screw connection is recommended to be installed at the position close to the punch at the front end of the table surface) is checked, then the low-pressure air of 0.2MPa is filled into the foundation-free damping device 8 by pressing the air charging button, and at the moment, the damping effect of the damping air bag 86 is optimal. And then checking whether the two infrared gratings are aligned or not, and finally smearing lubricating oil on the joint of the impact piston 17 and the copper sleeve of the cavity 11 and the two table-board sliding rails 51 to ensure the smoothness of the movable parts.

After the preparation work is finished, starting to perform an impact pre-test, firstly clicking a power-on button to electrify the whole testing machine, then clicking an oil source button to start an external oil source. And according to the requirement of the test condition to be performed, whether the front rubber piers 42 of the large pulse width waveform generator 4 are replaced or not is required according to the conventional debugging records, and if the front rubber piers 42 are required to be replaced, the front rubber piers can be detached anticlockwise and screwed on clockwise. After the replacement is completed, corresponding pressure parameters are input into the impact pressure controller and the pulse pressure accumulation controller on the electric control panel, the pulse pressure accumulation button and the impact pressure accumulation button are clicked, corresponding oil pressure and air pressure are filled into the oil storage cylinder 43 and the cavity 11 of the large pulse width waveform generator 4, feedback signals are respectively given to the two controllers by the first pressure sensor 15 and the second pressure sensor 45, and after the display value reaches a set value, the pressurizing action is automatically stopped. If the impact pressure accumulation is inflated, the exhaust valve is always exhausted to check whether the infrared gratings in the infrared protection device 2 are aligned two by two, and the unaligned infrared gratings need to be manually adjusted. After the pressurization is finished, the cylinder push rod 71 of the reset cylinder 73 is in a retracted state, at the moment, the impact button can be clicked to impact, after the impact button is clicked, the braking module 18 of the impact piston 17 releases the brake, the air outlet 16 of the air inlet/outlet electromagnetic valve of the punch piston 2 is reset to open, the impact piston 17 is rapidly ejected under the action of cavity pressure, the impact table top 3 is pushed to rapidly impact the large pulse width waveform generator 4 along the table top slide rail 51, a corresponding impact acceleration peak value is generated, and meanwhile, under the action of hydraulic oil of the oil storage cylinder 43 extruded by the front rubber pier 42 of the large pulse width waveform generator 4 and the moving piston base 41, a corresponding pulse duration is generated. The impact table top 3 triggers the second proximity sensor 202 and the third proximity sensor 203 in the impact waveform generator, and the second proximity sensor 202 controls the impact pressure release valve to open the exhaust. The third proximity sensor 203 is used for controlling the starting of the braking module 33 of the impact table 3 and the opening of the air inlet/outlet electromagnetic valve of the punch piston 2: (1) the braking module is started to prevent the impact table top 3 from moving backwards by the rebound force of the front rubber pier 41 and the moving piston base 42 to impact the impact piston 17 to impact the front nylon pad 20 to generate secondary impact, and the impact table top is automatically loosened after braking is started for 2 seconds; (2) the air inlet of the inlet/outlet electromagnetic valve of the punch piston 2 is opened, so that the piston of the punch piston 2 is reset, the proximity sensor four 204 lights after reset, and the impact piston 17 is started by the braking module. After braking 2s, the reset cylinder 73 ejects the cylinder push rod 71 under the control of the second proximity sensor 202 to push the impact table top 3 to reset, the first proximity sensor 201 is turned on after the impact table top 3 is reset, the cylinder push rod 71 of the reset cylinder 73 is reset, the magnetic switch 72 is arranged on the outer pull rod of the cylinder bottom plate, the magnetic switch 72 is turned on, the cylinder push rod 71 is reset, and the completion of one impact action is indicated. If the debugging result of the impact pre-test is not ideal, the impact pressure and the oil pressure of the waveform generator can be regulated according to the last impact result, and the impact is carried out again until the ideal effect is achieved. After the debugging result is satisfied, the impact is recommended to be continued for 2 to 3 times, and the stability of the impact repetition is verified. At this time, the test sample is approximately rigidly fixed on the impact table top 3 through a tool or a pressing plate to perform impact test. The above operations are all the half sine wave impact test, if the post peak sawtooth wave impact is performed, before the impact, the 'waveform' button on the control panel is needed to be clicked, after the impact table top 3 triggers the proximity sensor two 202, the high-pressure electromagnetic valve one 443 on the energy absorbing device 44 is opened, hydraulic oil in the oil storage cylinder 43 is extruded into the energy absorbing device 44 under the action of the moving piston, the high-pressure electromagnetic valve one 443 is randomly closed after being opened for 2 seconds, the hydraulic oil is locked in the energy absorbing device 44, after the impact table top 3 is reset, the proximity sensor one 201 is lighted, the high-pressure electromagnetic valve one 443 is opened, the hydraulic oil in the energy absorbing device 44 is reinjected into the oil storage cylinder 43, the moving piston on the moving piston base 41 is pushed to be reset, and the high-pressure electromagnetic valve one 443 is closed after being opened for 2 seconds, so as to complete the peak sawtooth wave impact test.

The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims (10)

1. The utility model provides a high energy impact testing machine of large pulse width, includes exempts from ground damping device, its characterized in that: the device comprises a foundation-free damping device, and is characterized in that a cavity energy applying device, a sliding device and a large pulse width waveform generator are arranged on the foundation-free damping device, the sliding device is located between the cavity energy applying device and the large pulse width waveform generator, an impact table top is connected to the sliding device in a sliding mode, one end of the cavity energy applying device is opposite to one end of the impact table top and provides impact force for the impact table top, the large pulse width waveform generator is opposite to the other end of the impact table top and receives the impact force, the cavity energy applying device comprises a cavity, an impact piston is sleeved in the cavity, a pressure source for providing low-pressure air in the cavity is connected to the cavity, and in a test, the impact table top is triggered by the pressure source with different sizes to impact the impact piston to the large pulse width waveform generator according to different impact energies.

2. A large pulse width high energy impact tester according to claim 1, wherein: the foundation-free damping device is also provided with a resetting device, two sides of the large pulse width waveform generator are provided with the resetting device, and one end of the resetting device is resisted with the impact table top; the impact table top after impact is driven by the reset device to restore to the initial moving position on the sliding device.

3. A large pulse width high energy impact tester according to claim 1 or 2, wherein: the novel impact piston is characterized in that the cavity is further provided with an accumulation air inlet, an accumulation air outlet and a punch return air inlet/outlet, the cavity is internally sleeved with a cylinder body, the cylinder body is respectively communicated with the accumulation air inlet, the accumulation air outlet and the punch return air inlet/outlet, the impact piston is nested at one end in the cylinder body, the other end in the cylinder body is provided with a brake, and the brake is located at the tail end of the cylinder body and opposite to the impact piston.

4. A large pulse width high energy impact tester as defined in claim 3, wherein: the sliding device comprises a table top sliding rail which is arranged on the foundation-free damping device and is in sliding connection with the impact table top; the lower part of the impact table top is provided with a brake module, and the brake module and the table top sliding rail are used for braking.

5. A large pulse width high energy impact tester according to claim 4, wherein: the impact table top is a sample installation table top, one end of the sample installation table top is connected with a steel punch used for impacting the large pulse width waveform generator, the other end of the sample installation table top is connected with a steel pushing plate used for increasing the impact surface of the piston, the lower end of the sample installation table top is provided with a mounting frame, a shaft sleeve is sleeved on a table top sliding rail in a sliding mode, and the shaft sleeve is connected with the mounting frame.

6. A large pulse width high energy impact tester according to claim 5, wherein: the foundation-free damping device is characterized in that an impact bearing wall is further arranged on the foundation-free damping device, the large pulse width waveform generator is fixed on the impact bearing wall, the impact bearing wall comprises a main bearing wall and a supporting plate, the main bearing wall is connected to the foundation-free damping device, and the supporting plate is respectively connected to two sides and the middle position of the main bearing wall and is connected with the foundation-free damping device.

7. A large pulse width high energy impact tester according to claim 6, wherein: the large pulse width waveform generator comprises a front rubber pier, a moving piston base, an oil storage cylinder body and an energy absorbing device, wherein the oil storage cylinder body is fixed on the impact bearing wall, the moving piston base is arranged in the oil storage cylinder body, and the bottom of the front rubber pier is connected to the moving piston base; the energy absorbing device comprises a flange and a rubber bag, one end of the flange is arranged on the impact bearing wall, the other end of the flange is provided with the rubber bag, and the rubber bag is communicated with the oil storage cylinder body.

8. A large pulse width high energy impact tester as defined in claim 2, wherein: the resetting device comprises a resetting cylinder arranged on the foundation-free damping device, the two sides of the large pulse width waveform generator are respectively provided with the resetting cylinder, a cylinder push rod sleeved at the front end of the resetting cylinder is respectively blocked with the lower part of the impact table top, and after the impact table top completes impact action, the cylinder push rod ejects and pushes the impact table top to reset.

9. A large pulse width high energy impact tester according to claim 7, wherein: the infrared protection devices are arranged on two sides of the impact table top and comprise infrared gratings, and the infrared gratings are arranged from the initial position of the impact table top to the outside of the impact bearing wall; and in the test, the straight line position projected by the infrared grating is triggered to stop when being touched by an object.

10. A large pulse width high energy impact tester according to claim 8, wherein: the foundation-free damping device comprises a supporting bottom plate, a table top bottom plate, an automobile damper, a hydraulic damper, V-shaped mounting plates and damping air bags, wherein one end of the automobile damper is arranged on two sides of the bottom of the table top bottom plate, the other end of the automobile damper is arranged at two ends of the top of the supporting bottom plate, the V-shaped mounting plates are distributed at the bottom of the table top bottom plate and the top of the supporting bottom plate in a staggered manner relatively, and the two sides of the V-shaped mounting plates are respectively connected with the two sides of the V-shaped mounting plates

One end of the hydraulic shock absorber is connected, the other end of the hydraulic shock absorber is connected to the top of the supporting bottom plate,

the damping air bag is extruded between the inclined planes of the V-shaped mounting plate at the upper side and the V-shaped mounting plate at the lower side.