Impact test bench with good test result accuracy and reproducibility
By designing a split cylinder assembly on the impact test bench, using the inner wall of the central hole and the outer wall of the cylinder to form an air storage chamber, pneumatic boost is achieved, which solves the problem that traditional impact test benches are difficult to achieve high drop acceleration, and improves the test results Accuracy and reproducibility to meet customer needs.
Patent Information
- Application Number
- CN202411275219.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2022-08-29
- Publication Date
- 2024-12-13
AI Technical Summary
It is difficult for traditional impact test benches to achieve high drop acceleration, and the existing pneumatic pressurization schemes have problems such as difficult processing, high cost, limited capacity of the gas storage chamber and poor stability, resulting in poor accuracy and reproducibility of the test results.
An impact test bench including an impact body, an impact table and a cylinder assembly is designed. By setting a central hole on the impact body, the cylinder block of the cylinder assembly is coaxially arranged in the central hole, and a split structure design uses the inner wall of the central hole and The outer wall of the cylinder body is surrounded by an air storage chamber, which achieves pneumatic boosting and increases the drop acceleration.
It achieves low processing difficulty, low cost, and small capacity limitation of the gas storage chamber, which can greatly improve the drop acceleration, good accuracy and reproducibility of the test results, meet customer needs, and improve the stability of the test bench.
Smart Images
Figure CN119124533A_ABST
Abstract
Description
[0001] Divisional Application Statement
[0002] This application is a divisional application of the Chinese invention patent application filed on August 29, 2022, with the invention name “A Impact Test Bench and an Impact Test Method” and application number 202211040107.X. Technical Field
[0003] The invention belongs to the technical field of testing instruments, and in particular relates to an impact test bench with good test result accuracy and reproducibility. Background Art
[0004] The impact test bench is a common laboratory testing instrument used to simulate the ability of a product to withstand impact damage during actual use, so as to evaluate the impact resistance of the product structure and optimize the product structure strength and improve product quality through test data.
[0005] Most traditional impact test benches perform impact tests by free fall of the load. After removing factors such as aerodynamic resistance and friction of the impact table, the acceleration during fall is only about 7.6m / s2, which cannot exceed the acceleration of gravity. Such impact test benches are difficult to adapt to large-energy impact tests. To solve this problem, impact test benches that increase the drop acceleration by pneumatic pressurization have appeared on the market. For example, Chinese patent CN105865739A discloses such an impact test bench, which increases the drop acceleration by pressurizing the positive working chamber of the cylinder. However, this solution has at least the following problems:
[0006] 1. The air storage chamber and the working chamber for pressurization are arranged in the same cylinder body, and the air duct for connecting the air storage chamber and the working chamber is also integrated on the same cylinder body. The processing difficulty and cost of the cylinder body are high. Due to the processing difficulty and cost, the capacity of the air storage chamber is limited. When working, the improvement of the drop acceleration is limited, and it is difficult to achieve a drop acceleration of 17-18m / s2 or more than 18m / s2, which cannot meet customer needs.
[0007] 2. In order to overcome the defect of limited capacity of the air storage chamber in a single cylinder, this scheme conducts tests by operating two groups of cylinders simultaneously. However, due to the fluctuation of the air source, it is difficult to achieve a balanced and unified intake and exhaust speed of the two cylinders, and it is easy to have asynchronous lifting and lowering, resulting in poor stability and reliability, and poor accuracy and reproducibility of the test results. Summary of the invention
[0008] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide an impact test bench with low processing difficulty, low cost, small air storage chamber capacity limitation, ability to greatly improve drop acceleration, and good test result accuracy and reproducibility.
[0009] In order to achieve the above-mentioned purpose, the product in the technical solution adopted by the present invention is an impact test bench with good test result accuracy and reproducibility, comprising:
[0010] An impact body, wherein the impact body is provided with a central hole penetrating the impact body in an up-down direction;
[0011] An impact table, the impact table being located above the impact body;
[0012] A cylinder assembly, the cylinder assembly is used to drive the impact table to perform lifting movement, the cylinder assembly includes a cylinder body, an air intake and exhaust module, a piston, and a piston rod, the cylinder body is coaxially arranged in the center hole and is provided with a working chamber, the air intake and exhaust module includes a first air intake and exhaust module tightly sealed with the upper end surface of the cylinder body, and a second air intake and exhaust module tightly sealed with the lower end surface of the cylinder body, the piston is slidably connected in the working chamber and divides the working chamber into a forward working chamber located at the top and a reverse working chamber located at the bottom, the upper end of the piston rod passes through the first air intake and exhaust module and is connected to the impact table, and the lower end of the piston rod is connected to the piston;
[0013] The first air intake and exhaust module is embedded in the upper opening of the central hole, and the second air intake and exhaust module is connected to the lower opening of the central hole, so that the inner wall of the central hole and the outer wall of the cylinder body form an air storage chamber of the cylinder assembly;
[0014] The air storage chamber is connected with the forward working chamber through a forward air intake passage, and the forward air intake passage includes a first ventilation control chamber, a first ventilation port, and a first connecting air passage arranged on the first air intake and exhaust module. The side wall of the first ventilation control chamber is dynamically sealed and slidingly connected with a first sealing plug. The first sealing plug separates the first ventilation control chamber into a first control chamber and a first ventilation chamber. The first control chamber is connected with a first control air source through a first switching air passage and a first control air passage. The first ventilation chamber is connected with the air storage chamber. The first ventilation port is provided on the side wall of the first ventilation control chamber and is connected with the forward working chamber through the first connecting air passage.
[0015] The first control air passage includes a first blind hole arranged on the first intake and exhaust module, a second blind hole arranged on the second intake and exhaust module, and a connecting pipe connecting the first blind hole and the second blind hole, and the connecting pipe is arranged in the air storage cavity.
[0016] Preferably, the air storage chamber is connected to a working air source, and when the air pressure in the first control chamber is greater than the air pressure in the first ventilation chamber, the first ventilation port is blocked by the first sealing plug, and when the air pressure in the first control chamber is less than the air pressure in the first ventilation chamber, the forward working chamber is connected to the air storage chamber through the first ventilation port and the first ventilation chamber.
[0017] Preferably, the cross-sectional area of the air storage chamber is 1.5 to 3 times the cross-sectional area of the working chamber.
[0018] Preferably, the wall thickness of the middle portion of the air storage cavity is greater than the wall thickness at both ends.
[0019] Preferably, there are multiple forward air intake channels.
[0020] Preferably, the second blind hole is communicated with a first control gas source port provided on a side wall of the second intake and exhaust module.
[0021] Preferably, the impact body includes a base, a counterweight block, and an upper cover. The base is supported on a base plate through an air spring assembly. The counterweight block is sealed and connected to the base. The upper cover is arranged on the counterweight block. The first intake and exhaust module is arranged through the center of the upper cover.
[0022] Further preferably, the impact test bench further comprises an iron platform arranged between the upper cover and the impact table surface.
[0023] Preferably, the upper end portion of the piston rod is inserted into the impact table and fixedly connected to the impact table, and the upper end surface of the piston rod is lower than the upper surface of the impact table.
[0024] Preferably, the impact test bench further comprises a hydraulic locking rod mechanism for locking or releasing the piston rod, wherein the hydraulic locking rod mechanism is penetrated through the first intake and exhaust module and symmetrically arranged on the left and right sides of the piston rod.
[0025] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:
[0026] The impact test bench with good test result accuracy and reproducibility provided by the present invention comprises an impact body, an impact table top and a cylinder assembly. By opening a center hole penetrating the impact body in the up-down direction on the impact body, the cylinder body of the cylinder assembly is coaxially arranged in the center hole, and the first / second air intake and exhaust modules of the cylinder assembly are embedded in the upper / lower opening of the center hole. The inner wall of the center hole and the outer wall of the cylinder body can be used to form an air storage chamber of the cylinder assembly, and the first control air passage connecting the air storage chamber and the forward working chamber of the cylinder body comprises a first blind hole arranged on the first air intake and exhaust module, a second blind hole arranged on the second air intake and exhaust module, and a connecting pipe connecting the first and second blind holes. The connecting pipe is arranged in the air storage chamber, so that a split structural design can be realized, the processing difficulty is small, the cost is low, the capacity of the air storage chamber is less limited, the drop acceleration can be greatly improved, and the test result accuracy and reproducibility are good. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a left side schematic diagram of a preferred embodiment of the present invention, with a partial cross-section.
[0028] Figure 2 yes Figure 1 Schematic diagram of longitudinal section.
[0029] Figure 3 yes Figure 2 A local enlarged schematic diagram of point A in the middle.
[0030] Figure 4 yes Figure 2 A local enlarged schematic diagram of point B in the middle.
[0031] Figure 5 yes Figure 2 A partial enlarged schematic diagram of point C in the middle.
[0032] Figure 6 yes Figure 3 The cross-sectional diagram in the DD direction hides the impact body for easy observation.
[0033] Among them: 10. Impact body; 11. Center hole; 12. Base; 13. Counterweight; 131. Boosting device; 14. Upper cover; 141. Hollow connecting rod; 15. Air spring assembly; 16. Bottom plate; 17. Fixed bracket; 18. Lifting ring; 19. Iron platform; 20. Impact table; 21. Impact panel; 22. Guide assembly; 23. Linear bearing; 24. Guide rod; 25. Plug bolt; 31. Cylinder body; 32. First intake and exhaust mold block; 321. first base; 322. first end cover; 33. second intake and exhaust module; 331. second base; 332. second end cover; 34. piston; 35. piston rod; 36. forward working chamber; 37. reverse working chamber; 38. air storage chamber; 40. hydraulic locking rod mechanism; 51. first control chamber; 52. first ventilation chamber; 53. first ventilation port; 54. first connecting airway; 55. first sealing plug; 56. first conversion airway; 5 7. First control airway; 571. First blind hole; 572. Second blind hole; 573. Connecting pipe; 58. Interface of first control air source; 61. Second control chamber; 62. Second ventilation chamber; 621. First spring; 63. Second ventilation port; 64. Second connecting airway; 65. Second sealing plug; 651. Spring mounting groove; 66. Second switching airway; 67. Ventilation hole; 68. Flow limiting airway; 681. Axial blind hole; 682. Radial blind hole Hole; 683. annular airway; 71. third control chamber; 72. third ventilation chamber; 73. third ventilation port; 74. third connecting airway; 75. third sealing plug; 76. third conversion airway; 77. second control airway; 78. interface of second control air source; 81. fourth control chamber; 82. fourth ventilation chamber; 83. fourth ventilation port; 84. fourth connecting airway; 85. fourth sealing plug; 86. fourth conversion airway; 87. ventilation hole. DETAILED DESCRIPTION
[0034] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.
[0035] The up and down directions described in the present invention are Figure 1 , Figure 2 The up and down directions in .
[0036] like Figures 1 to 6As shown, the impact test bench provided by the present invention includes: an impact body 10, an impact table 20, a cylinder assembly, and a hydraulic locking rod assembly 40, wherein the impact table 20 is movably arranged above the impact body 10; the cylinder assembly is used to drive the impact table 20 to perform lifting movements, the cylinder assembly includes a cylinder body 31, an air intake and exhaust module, a piston 34, and a piston rod 35, the cylinder body 31 extends in a vertical direction and is provided with a working chamber, the air intake and exhaust module includes a first air intake and exhaust module 32 tightly sealed with the upper end surface of the cylinder body 31, and a second air intake and exhaust module 33 tightly sealed with the lower end surface of the cylinder body 31, the piston 34 is dynamically sealed and slidably connected to the side wall of the working chamber and divides the working chamber into a positive working chamber 36 located above and a reverse working chamber 37 located below, the lower end of the piston rod 35 is connected to the piston 34, and the upper end of the piston rod 35 passes through the first air intake and exhaust module Block 32 is connected to the impact table 20; the hydraulic locking rod mechanism 40 is used to lock or release the piston rod 35; specifically, a central hole 11 is opened on the impact body 10 and passes through the impact body 10 in the up and down directions, the cylinder body 31 is coaxially arranged in the central hole 11, the first air intake and exhaust module 32 is embedded in the upper orifice portion of the central hole 11 and is sealedly connected to the orifice portion, the second air intake and exhaust module 33 is connected to the lower orifice portion of the central hole 11 and is sealedly connected to the orifice portion, the inner wall of the central hole 11 and the outer wall of the cylinder body 31 form an air storage chamber 38 of the cylinder assembly, the air storage chamber 38 is connected to the working air source, the forward working chamber 36 is connected to the air storage chamber 38 through the forward air intake channel, the forward working chamber 36 is connected to the outside through the forward exhaust channel, the reverse working chamber 37 is connected to the working air source through the reverse air intake channel, and the reverse working chamber 37 is connected to the outside through the reverse exhaust channel.
[0037] The advantage of this arrangement is that the inner wall of the center hole and the outer wall of the cylinder body can be used to form an air storage chamber of the cylinder assembly, thereby increasing the drop acceleration through pneumatic boosting to adapt to large-energy impact tests. The split structural design has low processing difficulty and low cost, and the capacity of the air storage chamber is less limited, which can greatly increase the drop acceleration and realize impact tests with drop accelerations of 17-18m / s2 or more than 18m / s2, meeting customer needs. The test results are accurate and reproducible. At the same time, the impact body can also act as a counterweight, making the test bench more stable.
[0038] Furthermore, the cross-sectional area of the air storage chamber 38 is 1.5 to 3 times the cross-sectional area of the working chamber. Specifically, the radius of the center hole 11 is 200-215 mm, the radius of the cylinder body 31 is 125 mm, and the wall thickness of the cylinder body 31 is 10 mm; further, in order to facilitate the sealing connection between the first intake and exhaust module 32 and the second intake and exhaust module 33 and the orifice of the center hole 11, the middle wall thickness of the air storage chamber 38 is greater than the wall thickness at both ends. The wall thickness refers to the radial width of the cross-sectional area of the air storage chamber 38, the middle wall thickness is 215 mm, and the wall thickness at both ends is 200 mm.
[0039] In the present embodiment, the forward air intake passage includes a first ventilation control chamber, a first ventilation port 53, and a first connecting air passage 54 provided on the first air intake and exhaust module 32. The side wall of the first ventilation control chamber is dynamically sealed and slidingly connected with a first sealing plug 55. The first sealing plug 55 divides the first ventilation control chamber into a first control chamber 51 and a first ventilation chamber 52. The first control chamber 51 is communicated with an interface 58 of a first control air source through a first switching air passage 56 and a first control air passage 57. The first ventilation chamber 52 is communicated with an air storage chamber 38. The first ventilation port 53 is provided on the side wall of the first ventilation control chamber and is communicated with the forward working chamber 36 through the first connecting air passage 54. When the air pressure in the first control chamber 51 is greater than the air pressure in the first ventilation chamber 52, the first ventilation port 53 is blocked by the first sealing plug 55. When the air pressure in the first control chamber 51 is less than the air pressure in the first ventilation chamber 52, the forward working chamber 36 is communicated with the air storage chamber 38 through the first ventilation port 53 and the first ventilation chamber 52.
[0040] The forward exhaust channel includes a second ventilation control chamber, a second ventilation port 63, and a second connecting airway 64 provided on the first intake and exhaust module 32. The side wall of the second ventilation control chamber is slidably connected with a second sealing plug 65. The second sealing plug 65 separates the second ventilation control chamber into a second control chamber 61 and a second ventilation chamber 62. The second control chamber 61 is connected to the interface 58 of the first control air source through the second transfer airway 66 and the first control airway 57. The second ventilation chamber 62 is connected to the interface 58 of the first control air source through the second connecting airway 64. The second ventilation port 63 is connected to the forward working chamber 36, and is provided on the side wall of the second ventilation control chamber, and is connected to the outside through the ventilation hole 67 provided on the side wall of the first intake and exhaust module 32. When the air pressure in the second control chamber 61 is greater than the air pressure in the second ventilation chamber 62, the forward working chamber 36 is connected to the outside through the second ventilation chamber 62 and the second ventilation port 63. When the air pressure in the second control chamber 62 is less than the air pressure in the second ventilation chamber 61, the second ventilation port 63 is blocked by the second sealing plug 65.
[0041] The reverse air intake passage includes a third ventilation control chamber, a third ventilation port 73, and a third connecting air passage 74 arranged on the second air intake and exhaust module 33. The side wall of the third ventilation control chamber is dynamically sealed and slidingly connected with a third sealing plug 75. The third sealing plug 75 divides the third ventilation control chamber into a third control chamber 71 and a third ventilation chamber 72. The third control chamber 71 is connected to the interface 78 of the second control air source through the third conversion air passage 76 and the second control air passage 77. The third ventilation chamber 72 is connected to the reverse working chamber 37 through the third connecting air passage 74. The third ventilation port 73 is provided on the side wall of the third ventilation control chamber and is connected to the working air source. When the air pressure in the third control chamber 71 is greater than the air pressure in the third ventilation chamber 72, the third ventilation port 73 is blocked by the third sealing plug 75. When the air pressure in the third control chamber 71 is less than the air pressure in the third ventilation chamber 72, the reverse working chamber 37 is connected to the working air source through the third ventilation chamber 72 and the third ventilation port 73.
[0042] The reverse exhaust passage includes a fourth ventilation control chamber, a fourth ventilation port 83, and a fourth connecting airway 84 provided on the second intake and exhaust module 33. The side wall of the fourth ventilation control chamber is dynamically sealed and slidingly connected with a fourth sealing plug 85. The fourth sealing plug 85 separates the fourth ventilation control chamber into a fourth control chamber 81 and a fourth ventilation chamber 82. The fourth control chamber 81 is connected to the interface 78 of the second control air source through the fourth conversion airway 86 and the second control airway 77. The fourth ventilation chamber 82 is connected to the interface 78 of the second control air source through the fourth connecting airway 84. The fourth ventilation port 83 is connected to the reverse working chamber 37, and is opened on the side wall of the fourth ventilation control chamber, and is connected to the outside through the ventilation hole 87 opened on the side wall of the second intake and exhaust module 33. When the air pressure in the fourth control chamber 81 is greater than the air pressure in the fourth ventilation chamber 82, the fourth ventilation port 83 is blocked by the fourth sealing plug 85. When the air pressure in the fourth control chamber 81 is less than the air pressure in the fourth ventilation chamber 82, the reverse working chamber 37 is connected to the outside through the fourth ventilation chamber 82 and the fourth ventilation port 83.
[0043] The advantage of such an arrangement is that the intake and exhaust of the forward working chamber and the intake and exhaust of the reverse working chamber do not interfere with each other, while reducing the number of control gas paths as much as possible.
[0044] Furthermore, the first control air duct 57 includes a first blind hole 571 arranged on the first intake and exhaust module 32, a second blind hole 572 arranged on the second intake and exhaust module 33, and a connecting pipe 573 connecting the first blind hole 571 and the second blind hole 572, the second blind hole 572 is connected to the interface 58 of the first control air source arranged on the side wall of the second intake and exhaust module 33, and the connecting pipe 573 is arranged in the air storage chamber 38.
[0045] The advantage of such a configuration is that the number of openings on the side wall of the first intake and exhaust module can be reduced as much as possible, the layout of the first intake and exhaust module can be optimized, and at the same time, the interfaces for controlling the air source can be concentrated on the second intake and exhaust module for easy installation.
[0046] Furthermore, a first spring 621 is provided in the second ventilation cavity 62, and the two ends of the first spring 621 are respectively pressed against the bottom wall of the second ventilation cavity 62 and the end surface of the second sealing plug 65 close to the second ventilation cavity 62. The first spring 621 has a tendency to drive the second sealing plug 65 to move to a position to block the second ventilation port 63. In order to prevent the first spring 621 from shaking, a spring mounting groove 651 is also provided on the end surface of the second sealing plug 65 close to the second ventilation cavity 62.
[0047] The advantage of such an arrangement is that the second sealing plug located in the horizontally arranged second ventilation control chamber can be reset faster by the first spring.
[0048] Furthermore, the forward exhaust channel also includes a flow limiting airway 68 arranged in the second sealing plug 65, and the flow limiting airway 68 includes an axial blind hole 681 opened at the center of the end surface of the second sealing plug 65 near the second ventilation cavity 62, a radial blind hole 682 opened on the side wall of the second sealing plug 65 and connected to the axial blind hole 681, and an annular airway 683 opened on the side wall of the second sealing plug 65 and connected to the radial blind hole 682. Specifically, the radial blind hole 682 is the narrowest part (throat) of the flow limiting airway 68, and the diameter of the radial blind hole 682 is 20%-30% of the diameter of the second ventilation cavity 62. In the present embodiment, the diameter of the radial blind hole 682 is 8 mm, and the diameter of the second ventilation cavity is 33 mm.
[0049] The advantage of this arrangement is that even if the first spring is not provided, when the air storage chamber is connected to the forward working chamber, most of the air pressure in the air storage chamber can be applied to the second sealing plug, driving the second sealing plug to reset and block the second ventilation port. During this process, although a portion of the gas overflows through the second ventilation port, due to the existence of the flow limiting airway, the amount of gas overflowed is small and does not affect normal testing.
[0050] Furthermore, a second spring 721 is provided in the third ventilation cavity 72, and the two ends of the second spring 721 are respectively pressed against the bottom wall of the third ventilation cavity 72 and the end surface of the third sealing plug 75 close to the third ventilation cavity 72. The second spring 721 has a tendency to drive the third sealing plug 75 to move toward a position to block the third ventilation port 73. In order to prevent the second spring 721 from shaking, a spring mounting groove 751 is also provided on the end surface of the third sealing plug 75 close to the third ventilation cavity 72.
[0051] The advantage of such an arrangement is that the third sealing plug located in the vertically arranged third ventilation control chamber can be reset faster by the second spring.
[0052] Furthermore, a connecting air passage is also provided on the third sealing plug 75. The connecting air passage is similar in structure to the flow limiting air passage 68, but does not have a flow limiting function, and will not be described in detail herein.
[0053] In this embodiment, there are multiple forward air intake channels, forward exhaust channels, and reverse exhaust channels. Specifically, there are seven forward air intake channels, two forward exhaust channels, and twelve reverse exhaust channels. To facilitate processing, the first air intake and exhaust module 32 includes a first base 321 and a first end cover 322, and the second air intake and exhaust module 33 includes a second base 331 and a second end cover 332. The first conversion air duct 56 is an annular groove arranged on the end face of the first end cover 322 that is attached to the first base 321.
[0054] In this embodiment, the impact body 10 includes a base 12, a counterweight 13, and an upper cover 14. The base 12 is supported on a bottom plate 16 by an air spring assembly 15. The base 12 and the bottom plate 16 are connected by a fixed bracket 17. The counterweight 13 is welded to the base 12. The upper cover 14 is arranged on the counterweight 13. The projection of the counterweight 13 on the upper surface of the base 12 falls on the upper surface of the base 12. The projection of the upper cover 14 on the upper surface of the counterweight 13 falls on the upper surface of the counterweight 13. A pair of side surfaces of the upper cover 14 are flush with a pair of side surfaces of the counterweight 13. The advantage of such an arrangement is that it can not only achieve counterweighting and enhance stability, but also reduce the processing difficulty of the impact body 10, and can also improve the capacity of the air storage chamber 38 and the strength of the outer wall of the air storage chamber 38. A plurality of lifting rings 18 are also provided on the upper surface of the base 12, and these lifting rings 18 are located around the counterweight 13.
[0055] Furthermore, the first air intake and exhaust module 32 is penetrated through the center of the upper cover 14, and the hydraulic locking rod mechanism 40 is penetrated through the center of the first air intake and exhaust module 32 and is symmetrically arranged on the left and right sides of the piston rod 35. The specific structure of the hydraulic locking rod mechanism 40 is the existing technology and will not be repeated here. A hollow connecting rod 141 is also horizontally penetrated through the upper cover 14, and the hollow connecting rod 141 is threadedly connected to the first air intake and exhaust module 32, wherein the cavity is aligned with the oil circuit interface of the hydraulic locking rod mechanism 40, for conveying hydraulic oil to the hydraulic locking rod mechanism 40, and a booster device 131 for pressurizing the hydraulic oil is also connected to the outer side of the counterweight block 13.
[0056] To facilitate the cooperation with the impact panel 21 at the bottom of the impact table 20 , the impact test bench further includes an iron platform 19 disposed between the upper cover 14 and the impact table 20 .
[0057] In order to facilitate guiding the impact table 20, a guide assembly 22 is connected to the outer side of the impact table 20. The guide assembly 22 includes a linear bearing 23 and a guide rod 24. The linear bearing 23 is fixed on the upper surface of the counterweight 13. The upper end of the guide rod 24 is connected to the side wall of the impact table 20. The lower end of the guide rod 24 can be slidably penetrated into the linear bearing 23 and inserted into the counterweight 13 and the base 12.
[0058] To facilitate lifting, in the present embodiment, the upper end portion of the piston rod 35 is inserted into the impact table 20 and fixedly connected to the impact table 20. The upper end surface of the piston rod 35 is lower than the upper surface of the impact table 20. A plug bolt 25 is provided above the piston rod 35 for easy lifting. The plug bolt 25 is embedded in the impact table 20. The plug bolt 25 is threadedly connected to the impact table 20. The upper end surface of the plug bolt 25 is flush with the upper surface of the impact table 20. The upper end surface of the plug bolt 25 is provided with a plurality of threaded holes for lifting.
[0059] The present invention also provides an impact test method, using the above-mentioned impact test bench, the impact test method comprises the following steps:
[0060] S1. Connect the first control gas source to connect the forward working chamber with the outside world;
[0061] S2. Turn on the second control gas source, so that the fourth ventilation port is blocked by the fourth sealing plug, so that the working gas source enters the reverse working chamber along the reverse air inlet channel, so that the piston drives the impact table to rise to the set position;
[0062] S3. Lock the piston rod through the hydraulic locking rod mechanism so that the impact table is positioned to the set height;
[0063] S4. Close the working gas source connected to the third ventilation port and release the second control gas source so that the third sealing plug blocks the third ventilation port, so that the reverse working chamber is connected to the outside;
[0064] S5. Place the workpiece to be tested on the impact table;
[0065] S6. Release the first control air source and loosen the hydraulic locking rod mechanism to release the piston rod, so that the first sealing plug moves to the position of opening the first ventilation port under the action of the pressure in the air storage chamber, so that the air storage chamber is connected with the forward working chamber, and the second sealing plug blocks the second ventilation port under the action of the pressure in the air storage chamber, so that the air in the air storage chamber quickly enters the forward working chamber, and the gas in the reverse working chamber is quickly discharged, and the impact table falls rapidly under the dual action of the air pressure in the forward working chamber and the free fall motion, completing the impact test.
[0066] The advantage of this setting is that it can ensure rapid air intake in the forward working chamber and rapid exhaust in the reverse working chamber, and realize impact tests with drop acceleration of 17-18m / s2 or more than 18m / s2 to meet customer needs. At the same time, during the test, the additional load of the hydraulic locking rod mechanism can be reduced as much as possible to extend its service life.
[0067] Preferably, before step S1, the working air source connected to the air storage chamber is closed; before releasing the first control air source in step S6, the working air source connected to the air storage chamber is opened; the advantage of such an arrangement is that it can eliminate the influence of the air pressure in the air storage chamber on the rise of the impact table surface, and can also reduce the load when the hydraulic locking rod mechanism locks the piston rod.
[0068] Furthermore, before releasing the first control air source in step S6, the working air source connected to the air storage chamber is opened; the air pressure in the air storage chamber is made greater than or equal to the air pressure of the first control air source. The advantage of such a setting is that when the hydraulic locking rod mechanism releases the piston rod, there is a sufficient amount of high-pressure gas in the air storage chamber to ensure the effect of the impact test.
[0069] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.
Claims
1. An impact test bench with good test result accuracy and reproducibility, comprising: An impact body, wherein the impact body is provided with a central hole penetrating the impact body in an up-down direction; An impact table, the impact table being located above the impact body; A cylinder assembly, the cylinder assembly is used to drive the impact table to perform lifting movement, the cylinder assembly includes a cylinder body, an air intake and exhaust module, a piston, and a piston rod, the cylinder body is coaxially arranged in the center hole and is provided with a working chamber, the air intake and exhaust module includes a first air intake and exhaust module tightly sealed with the upper end surface of the cylinder body, and a second air intake and exhaust module tightly sealed with the lower end surface of the cylinder body, the piston is slidably connected in the working chamber and divides the working chamber into a forward working chamber located at the top and a reverse working chamber located at the bottom, the upper end of the piston rod passes through the first air intake and exhaust module and is connected to the impact table, and the lower end of the piston rod is connected to the piston; Features: The first air intake and exhaust module is embedded in the upper opening of the central hole, and the second air intake and exhaust module is connected to the lower opening of the central hole, so that the inner wall of the central hole and the outer wall of the cylinder body form an air storage chamber of the cylinder assembly; The air storage chamber is connected with the forward working chamber through a forward air intake passage, and the forward air intake passage includes a first ventilation control chamber, a first ventilation port, and a first connecting air passage arranged on the first air intake and exhaust module. The side wall of the first ventilation control chamber is dynamically sealed and slidingly connected with a first sealing plug. The first sealing plug separates the first ventilation control chamber into a first control chamber and a first ventilation chamber. The first control chamber is connected with a first control air source through a first switching air passage and a first control air passage. The first ventilation chamber is connected with the air storage chamber. The first ventilation port is provided on the side wall of the first ventilation control chamber and is connected with the forward working chamber through the first connecting air passage. The first control air passage includes a first blind hole arranged on the first intake and exhaust module, a second blind hole arranged on the second intake and exhaust module, and a connecting pipe connecting the first blind hole and the second blind hole, and the connecting pipe is arranged in the air storage cavity.
2. The impact test bench according to claim 1, characterized in that: The air storage chamber is connected to the working air source. When the air pressure in the first control chamber is greater than the air pressure in the first ventilation chamber, the first ventilation port is blocked by the first sealing plug. When the air pressure in the first control chamber is less than the air pressure in the first ventilation chamber, the forward working chamber is connected to the air storage chamber through the first ventilation port and the first ventilation chamber.
3. The impact test bench according to claim 1, characterized in that: The cross-sectional area of the air storage chamber is 1.5 to 3 times the cross-sectional area of the working chamber.
4. The impact test bench according to claim 1, characterized in that: The wall thickness of the middle part of the air storage cavity is greater than the wall thickness of the two ends.
5. The impact test bench according to claim 1, characterized in that: There are multiple forward air intake passages.
6. The impact test bench according to claim 1, characterized in that: The second blind hole is in communication with a first control gas source port disposed on a side wall of the second intake and exhaust module.
7. The impact test bench according to claim 1, characterized in that: The impact body includes a base, a counterweight block, and an upper cover. The base is supported on a bottom plate through an air spring assembly. The counterweight block is sealed and connected to the base. The upper cover is arranged on the counterweight block. The first intake and exhaust module is arranged through the center of the upper cover.
8. The impact test bench according to claim 7, characterized in that: The impact test bench also includes an iron platform arranged between the upper cover and the impact table surface.
9. The impact test bench according to claim 1, characterized in that: The upper end portion of the piston rod is inserted into the impact table and fixedly connected to the impact table, and the upper end surface of the piston rod is lower than the upper surface of the impact table.
10. The impact test bench according to claim 1, characterized in that: The impact test bench also includes a hydraulic locking rod mechanism for locking or releasing the piston rod. The hydraulic locking rod mechanism is penetrated on the first intake and exhaust module and is symmetrically arranged on the left and right sides of the piston rod.