Impact force measuring device for drop hammer impact test and drop hammer impact test system

Abstract

The utility model provides an impact force measuring device for a drop hammer impact test and a drop hammer impact test system, and relates to the technical field of explosive and powder product testing. The impact force measuring device for the drop hammer impact test comprises a base, an impact column sleeve, a first impact column, a second impact column, a membrane type pressure sensor and a signal collector, the impact column sleeve is detachably installed on the base, and an installation opening is formed in the middle of the impact column sleeve; the first strike column and the second strike column are sequentially installed in the installation opening from bottom to top, the membrane type pressure sensor is arranged between the first strike column and the second strike column, the area between the membrane type pressure sensor and the second strike column is configured to be filled with a sample, and the signal collector is arranged outside the base and is in communication connection with the membrane type pressure sensor. Compared with the prior art, by arranging the membrane type pressure sensor and the signal collector, the impact force borne by the sample can be synchronously measured in the drop hammer impact process, and the problem that the impact force of a traditional drop hammer impact test cannot be measured is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of explosive product testing technology, and particularly relates to a drop hammer impact test impact force measuring device and drop hammer impact test system. BACKGROUND

[0002] Explosive products may encounter many unexpected stimuli during production, transportation and use, such as impact, drop, roll, high-altitude drop, etc. These stimuli are important reasons for accidental ignition and combustion of explosives, and even explosion. Impact and drop are relatively dangerous and occur frequently. In order to minimize accidents caused by such unexpected stimuli, researchers have conducted a lot of research and developed various impact safety test methods, including drop hammer test method, 12 tool method, Susan test method and slide test method. Among them, the drop hammer test method is the most commonly used method for impact safety test of explosive materials.

[0003] To accurately describe the ignition response behavior of explosives under impact conditions, it is necessary to accurately describe the impact force and impact time. Although there are mature explosive impact safety test methods, many scenarios still cannot guide the safety work in the production and use of explosives. The reason is that the drop hammer test method usually uses drop hammer height as the load condition for evaluating the impact safety of explosives. Due to the limitation of device structure, the impact force and impact time are not measured, and it is difficult to establish a correlation with the actual impact load state. In addition, in recent years, based on the demand for deepening the understanding of the impact safety mechanism of explosives, it is required to quantitatively diagnose the impact behavior of explosives, so it is necessary to establish an impact quantitative diagnosis test device to solve this problem. Utility model content

[0004] The utility model aims to provide a drop hammer impact test impact force measuring device and drop hammer impact test system, which can measure the impact force received by the sample in situ without affecting the drop hammer impact test behavior, solving the problem of unable to measure the impact force of traditional drop hammer impact test.

[0005] The embodiments of the utility model can be implemented as follows:

[0006] The utility model provides a kind of drop hammer impact test impact force measuring device, including base, knock column sleeve, first knock column, second knock column, diaphragm pressure sensor and signal collector, the knock column sleeve is detachably installed on the base, and installation port is opened in middle part;The first knock column and the second knock column are sequentially installed in the installation port from bottom to top, the second knock column protrudes the knock column sleeve, the diaphragm pressure sensor is arranged between the first knock column and the second knock column, the area between the diaphragm pressure sensor and the second knock column is configured to be loaded into sample, the diaphragm pressure sensor is configured to monitor the impact force that the sample is subjected to during loading process, the signal collector is arranged outside the base, and is connected with the diaphragm pressure sensor, and is configured to obtain and display impact force curve during loading process.

[0007] In optional implementation, the outer side wall of the knock column sleeve is provided with a wire slot hole, the wire slot hole penetrates to the installation port, and corresponds to the first knock column and the second knock column, the diaphragm pressure sensor has a lead wire, the lead wire passes through the wire slot hole and is connected with the signal collector.

[0008] In optional implementation, the diaphragm pressure sensor and the second knock column are further provided with a gasket, the gasket is configured between the diaphragm pressure sensor and the sample, so that the sample is misaligned with the wire slot hole.

[0009] In optional implementation, the gasket is a polytetrafluoroethylene sheet, and the thickness of the gasket is between 2-4mm.

[0010] In optional implementation, the two side surfaces of the diaphragm pressure sensor are further provided with a layer of silicone grease.

[0011] In optional implementation, the first knock column and the second knock column are both cylindrical, and are adapted to the shape of the installation port.

[0012] In optional implementation, the shape of the diaphragm pressure sensor is adapted to the end surface shape of the first knock column and the second knock column.

[0013] In optional implementation, the thickness of the diaphragm pressure sensor is less than or equal to 1mm.

[0014] In optional implementation, the top of the base is provided with a positioning groove, and the knock column sleeve is fitted in the positioning groove.

[0015] In a second aspect, the utility model provides a kind of drop hammer impact test system, including drop hammer, base and the drop hammer impact test impact force measuring device of any one of the preceding embodiment, the drop hammer impact area of the base is provided with limit slot, the base is assembled in the limit slot, the drop hammer is set above the drop hammer impact area, is configured to impact the second knock column.

[0016] The drop hammer impact test impact force measuring device and the drop hammer impact test system provided by the utility model embodiment have the beneficial effects that:

[0017] In the utility model embodiment, the knock column sleeve is detachably mounted on the base, the mounting port is arranged on the knock column sleeve, the first knock column and the second knock column are sequentially mounted into the mounting port, and the sample is mounted between the first knock column and the second knock column, and the drop hammer impact test is realized by impacting the second knock column with the drop hammer.Moreover, the diaphragm pressure sensor is further arranged between the first knock column and the second knock column, the area between the diaphragm pressure sensor and the second knock column is configured to mount the sample, and the signal collector is in communication connection with the diaphragm pressure sensor.Compared with the prior art, the diaphragm pressure sensor and the signal collector are arranged, so that the impact force received by the sample during the drop hammer impact process can be synchronously measured, and the problem that the impact force cannot be measured in the conventional drop hammer impact test is solved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the utility model embodiment, the drawings needed to be used in the embodiment will be briefly introduced below, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as limiting the scope, and for those skilled in the art, other related drawings can be obtained without creative labor on the basis of these drawings.

[0019] Fig. 1 The structure schematic view of the drop hammer impact test impact force measuring device provided in the embodiment is shown in the first view angle.

[0020] Fig. 2 The partial exploded structure schematic view of the drop hammer impact test impact force measuring device provided in the embodiment is shown.

[0021] Fig. 3 The structure schematic view of the drop hammer impact test impact force measuring device provided in the embodiment is shown in the second view angle.

[0022] Icon: 100 - drop hammer impact test impact force measuring device; 110 - base; 111 - positioning groove; 120 - striker sleeve; 121 - mounting port; 122 - lead slot hole; 130 - first striker; 140 - second striker; 150 - diaphragm pressure sensor; 151 - lead wire; 160 - signal collector; 170 - gasket; 180 - silicone layer; 200 - sample. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0025] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0026] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0027] In addition, if the terms "first", "second" and the like appear, they are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0028] As disclosed in the background art, the drop hammer impact test in the prior art usually uses drop hammer height as the load condition for evaluating the impact safety of explosives, and due to the limitation of device structure, the impact force is not measured in the prior art, it is difficult to establish a correlation with the actual impact load state, so that the impact force during the drop hammer impact process is difficult to measure, and the stress state of the sample cannot be characterized.

[0029] In order to solve the above problems, the utility model provides a novel falling weight impact test impact force measuring device and falling weight impact test system, below the device and system are introduced in detail, it is to be explained that, in the case of no conflict, the features in the embodiment of the utility model can be combined with each other.

[0030] Reference Figs. 1 to 3 The falling weight impact test impact force measuring device 100 provided by the embodiment of the utility model can measure the impact force received by the sample 200 in situ synchronously without affecting the falling weight impact test behavior, and solves the problem that the impact force in the traditional falling weight impact test cannot be measured.

[0031] The falling weight impact test impact force measuring device 100 provided by the embodiment of the utility model comprises a base 110, a striker sleeve 120, a first striker 130, a second striker 140, a diaphragm pressure sensor 150 and a signal collector 160, the striker sleeve 120 is detachably installed on the base 110, and an installation opening 121 is formed in the middle part; the first striker 130 and the second striker 140 are installed in the installation opening 121 from bottom to top in sequence, the second striker extends out of the striker sleeve 120, the diaphragm pressure sensor 150 is arranged between the first striker and the second striker, the area between the diaphragm pressure sensor 150 and the second striker 140 is configured to load the sample 200, the diaphragm pressure sensor 150 is configured to monitor the impact force received by the sample 200 in the loading process, and the signal collector 160 is arranged outside the base 110 and is in communication connection with the diaphragm pressure sensor 150 and is configured to acquire and display the impact force curve in the loading process.

[0032] In actual falling weight impact test, the base 110 can be fixed in place first, and the installation of the striker sleeve 120 is completed, then the first striker 130 is loaded in the installation opening 121 of the striker sleeve 120, then the diaphragm pressure sensor 150 and the sample 200 are loaded, and finally the second striker 140 is loaded. After installation, the second striker 140 is impacted by the falling weight, so that the falling weight impact test is completed. During the impact process, the diaphragm pressure sensor 150 can monitor the impact force received by the sample 200 in the loading process, and the signal collector 160 can acquire and display the impact force curve in the loading process. Therefore, by arranging the diaphragm pressure sensor 150 and the signal collector 160, the impact force received by the sample 200 in the falling weight impact process can be measured synchronously, and the problem that the impact force in the traditional falling weight impact test cannot be measured is solved.

[0033] It should be noted that the loading process mentioned here refers to the process of the drop hammer impacting at different heights. The specific principle and working steps of the drop hammer impact test can be referred to the existing impact test. In addition, the membrane pressure sensor 150 mentioned in the embodiment is a piezoelectric film sensor. Its model and working principle can be referred to the existing film sensor. At the same time, the signal collector 160 can acquire and display the impact force curve in the loading process, so as to visualize the impact force. Its model and working principle can be referred to the piezoelectric display device used with the piezoelectric film sensor in the prior art. Moreover, the sample 200 mentioned in the embodiment can be a sample of explosives.

[0034] Further, the outer side wall of the striker sleeve 120 is provided with a wire groove hole 122 which penetrates to the mounting port 121 and corresponds to the space between the first striker 130 and the second striker 140. The membrane pressure sensor 150 has a lead wire 151 which penetrates through the wire groove hole 122 and is connected with the signal collector 160. Specifically, the lead wire 151 is the connecting wire of the membrane pressure sensor 150. In actual installation, the lead wire 151 can first penetrate through the wire groove hole 122 from the inside to the outside and be connected with the connecting wire of the external signal collector 160, so as to realize signal transmission. By designing the length of the lead wire 151, it can be ensured that the membrane part of the membrane pressure sensor 150 can be installed on the first striker 130 after the lead wire 151 penetrates through the wire groove hole 122, avoiding the interference of the lead wire 151 with the position of the membrane pressure sensor 150.

[0035] In some embodiments, a gasket 170 is further arranged between the membrane pressure sensor 150 and the second striker 140. The gasket 170 is arranged between the membrane pressure sensor 150 and the sample 200, so that the sample 200 is misaligned with the wire groove hole 122. Specifically, the gasket 170 is a polytetrafluoroethylene sheet, and the thickness of the gasket 170 is between 2-4 mm. The gasket 170 can be a polytetrafluoroethylene sheet and is placed below the sample 200. The gasket 170 can separate the sample 200 and the wire groove hole 122 on the striker sleeve 120, so as to avoid the sample 200 being squeezed into the wire groove hole 122 and affecting the test results. Moreover, the polytetrafluoroethylene material selected for the gasket 170 has similar acoustic wave impedance to the explosive material, which can reduce the reflection of stress waves at the interface between the sample 200 and the gasket 170 and reduce the influence on the pressure test of the sample 200.

[0036] In some embodiments, the two side surfaces of the diaphragm pressure sensor 150 are further provided with a layer of silicone grease 180. Specifically, before the diaphragm pressure sensor 150 is installed, silicone grease can be applied to the two side surfaces of the diaphragm pressure sensor 150, so that after the diaphragm pressure sensor 150 is installed in the installation opening 121, it can be more closely attached to the end face of the first striker 130, and at the same time the gasket 170 can also be more closely attached to the diaphragm pressure sensor 150. Among them, the upper and lower surfaces of the silicone grease layer 180 can eliminate interfacial air, so that the interface is in good contact and the accuracy of the test is improved.

[0037] In some embodiments, the first striker 130 and the second striker 140 are both cylindrical and are adapted to the shape of the installation opening 121. Among them, the inner diameter of the installation opening 121 is adapted to the outer diameter of the first striker 130 and the second striker 140, so that the first striker 130 and the second striker 140 can be limitingly installed in the installation opening 121. Moreover, the installation opening 121 is designed as a through opening, which facilitates the disassembly of the first striker 130 and the second striker 140.

[0038] In some embodiments, the shape of the diaphragm pressure sensor 150 is adapted to the shape of the end face of the first striker and the second striker. Specifically, the diaphragm film size of the diaphragm pressure sensor 150 is consistent with the cross-sectional size of the first striker 130 and the second striker 140, and the thickness of the diaphragm pressure sensor 150 is less than or equal to 1mm, reducing the influence of structural size on pressure test.

[0039] In some embodiments, the top of the base 110 is provided with a positioning groove 111, and the striker sleeve 120 is assembled in the positioning groove 111. Specifically, the inner diameter of the positioning groove 111 is adapted to the outer diameter of the striker sleeve 120, so that the striker sleeve 120 can be limitingly installed in the positioning groove 111 of the base 110. Moreover, the striker sleeve 120 can be protruded from the base 110, facilitating disassembly, and the base 110, the striker sleeve 120, the first striker 130 and the second striker 140 all adopt a split structure, further facilitating disassembly.

[0040] The utility model discloses an embodiment further provides a kind of drop hammer impact test system, including drop hammer, base and the aforementioned drop hammer impact test impact force measuring device 100, drop hammer impact test impact force measuring device 100 includes base 110, knock column cover 120, first knock column 130, second knock column 140, diaphragm pressure sensor 150 and signal collector 160, knock column cover 120 is detachably installed on base 110, and installation port 121 is opened in middle part;First knock column 130 and second knock column 140 are installed in installation port 121 in succession from bottom to top, second knock column protrudes knock column cover 120, diaphragm pressure sensor 150 is arranged between first knock column and second knock column, the area between diaphragm pressure sensor 150 and second knock column 140 is configured to be loaded into sample 200, diaphragm pressure sensor 150 is configured to monitor the impact force that sample 200 is subjected to during loading process, signal collector 160 is arranged outside base 110, and is connected with diaphragm pressure sensor 150, and is configured to obtain and display impact force curve during loading process.The base can be ground or special table, the drop hammer impact area of base is provided with limiting groove, base 110 is fixedly assembled in limiting groove, drop hammer is arranged above drop hammer impact area, and is configured to impact second knock column 140.

[0041] It should be noted that the drop hammer can be controlled by the control machine to control the height, so as to realize the drop hammer impact test at different heights.

[0042] The drop hammer impact test impact force measuring device 100 and the drop hammer impact test system provided by the embodiment can be applied to the drop hammer impact test of explosives, and the specific implementation method is as follows.

[0043] Step one, clean the surfaces of the first knock column 130, the second knock column 140 and the knock column cover 120, and wipe them clean, then place the knock column cover 120 into the base 110, and place the first knock column 130 into the knock column cover 120.

[0044] Step two, apply a layer of uniform silicon grease to the lower surface of the diaphragm pressure sensor 150, and place the diaphragm pressure sensor 150 on the upper surface of the first knock column 130, and the lead wire 151 of the diaphragm pressure sensor 150 is led out from the position of the lead wire groove hole 122 of the knock column cover 120.

[0045] Step three, place the gasket 170 on the upper surface of the diaphragm pressure sensor 150, and place the sample 200 on the center position of the upper surface of the gasket 170.

[0046] Step four, place the second knock column 140 on the upper surface of the sample 200 to be tested, gently press and rotate 1-2 circles, so that the interface is in good contact without gaps.

[0047] Step five, place the assembled base 110 into the limiting groove of the drop hammer impact area.

[0048] Step six, connecting the lead wire 151 of the diaphragm pressure sensor 150 to the signal collector 160;

[0049] Step seven, lifting the drop hammer to a predetermined height, releasing the drop hammer to hit the second striker 140, and the signal collector 160 records the loading pressure waveform and saves it.

[0050] In summary, the utility model discloses the first striker 130 and the second striker 140 are sequentially loaded into the mounting port 121, and the sample 200 is loaded between the first striker 130 and the second striker 140, and the drop hammer impact test is realized by the drop hammer hitting the second striker. Moreover, the diaphragm pressure sensor 150 is arranged between the first striker 130 and the second striker 140, the area between the diaphragm pressure sensor 150 and the second striker 140 is configured to load the sample 200, and the signal collector 160 is in communication connection with the diaphragm pressure sensor 150. Compared with the prior art, the utility model discloses the diaphragm pressure sensor 150 and the signal collector 160, which can measure the impact force of the sample 200 during the drop hammer impact process, and solve the problem that the impact force of the conventional drop hammer impact test cannot be measured. Moreover, the impact force does not need to be converted, and the utility model has the advantages of simple structure, easy operation, low cost and high accuracy, and can realize the quantitative characterization of the impact force in the drop hammer impact test of the explosive, and provide quantitative data support for the impact safety evaluation of the explosive.

[0051] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, and any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A device for measuring the impact force in a drop hammer impact test, characterized in that, The system includes a base (110), a striking pin sleeve (120), a first striking pin (130), a second striking pin (140), a diaphragm pressure sensor (150), and a signal acquisition unit (160). The striking pin sleeve (120) is detachably mounted on the base (110) and has an installation port (121) in the middle. The first striking pin (130) and the second striking pin (140) are installed sequentially from bottom to top in the installation port (121), with the second striking pin (140) extending out of the striking pin sleeve (120). The diaphragm pressure sensor (150)... 50) The area between the first impact post (130) and the second impact post (140) is configured to hold the sample (200), the diaphragm pressure sensor (150) is configured to monitor the impact force on the sample (200) during loading, and the signal acquisition unit (160) is disposed outside the base (110) and is communicatively connected to the diaphragm pressure sensor (150) and is configured to acquire and display the impact force curve during loading.

2. The impact force measuring device for a drop hammer impact test according to claim 1, characterized in that, The outer wall of the striking post sleeve (120) is provided with a wire slot (122), which extends through to the mounting port (121) and corresponds to the space between the first striking post (130) and the second striking post (140). The diaphragm pressure sensor (150) has a lead wire (151), which passes through the wire slot (122) and is connected to the signal acquisition device (160).

3. The impact force measuring device for a drop hammer impact test according to claim 2, characterized in that, A gasket (170) is also provided between the diaphragm pressure sensor (150) and the second impact pin (140). The gasket (170) is disposed between the diaphragm pressure sensor (150) and the sample (200) to make the sample (200) misaligned with the wire slot (122).

4. The impact force measuring device for a drop hammer impact test according to claim 3, characterized in that, The gasket (170) is a polytetrafluoroethylene sheet, and the thickness of the gasket (170) is between 2-4 mm.

5. The impact force measuring device for a drop hammer impact test according to claim 1, characterized in that, The two sides of the diaphragm pressure sensor (150) are also provided with a silicone grease layer (180).

6. The impact force measuring device for a drop hammer impact test according to claim 1, characterized in that, Both the first striking post (130) and the second striking post (140) are cylindrical and are adapted to the shape of the mounting port (121).

7. The impact force measuring device for a drop hammer impact test according to claim 6, characterized in that, The shape of the diaphragm pressure sensor (150) is adapted to the end face shape of the first striking post (130) and the second striking post (140).

8. The impact force measuring device for a drop hammer impact test according to claim 6 or 7, characterized in that, The thickness of the diaphragm pressure sensor (150) is less than or equal to 1 mm.

9. The impact force measuring device for a drop hammer impact test according to claim 1, characterized in that, The base (110) has a positioning groove (111) on its top, and the striking pin sleeve (120) is fitted in the positioning groove (111).

10. A drop hammer impact testing system, characterized in that, The device includes a drop hammer, a base, and a drop hammer impact test impact force measuring device as described in any one of claims 1-9. The base has a limit groove in the drop hammer impact area, the base (110) is fitted in the limit groove, and the drop hammer is disposed above the drop hammer impact area and configured to impact the second impact post (140).

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