Impact test bench suitable for small pulse width impact test and piston rod thereof

Abstract

The utility model provides an impact test bench suitable for a small pulse width impact test, which comprises a base, a lifting cylinder and an impact table board, and is characterized in that a piston rod of the lifting cylinder comprises a cylindrical rod body and a disc part which is coaxially connected to the upper end part of the rod body and is integrally formed with the rod body; the axial lead of the rod body and the center of the lower surface of the impact table top are located on the same straight line, the upper end face of the disc part and the lower surface of the impact table top are attached and locked, connection between the piston rod and the impact table top can be simplified and more compact, high-frequency clutters generated in the impact test are greatly reduced, and the impact test efficiency is improved. The method is more suitable for a small pulse width impact test with the pulse width less than 1ms; the piston rod of the impact test bench provided by the utility model comprises the rod body and the disc part, the piston rod can be directly connected with an impact table top through the disc part, the number of parts involved in connection is small, the structure is simple, high-frequency clutters can be greatly reduced during an impact test, and the piston rod is particularly suitable for a small pulse width impact test.

Description

Technical Field

[0001] The utility model belongs to the technical field of impact test equipment, and in particular relates to an impact test bench suitable for a small pulse width impact test and a piston rod thereof. Background Art

[0002] The impact test bench is the main equipment for impact test, which usually includes an impact table and a lifting cylinder with a piston rod. The upper end of the lifting cylinder is connected to the bottom of the impact table to drive the impact table to move downward and accelerate to achieve the impact test. For example, Chinese patent CN217735901U discloses this type of impact test bench, but the piston rod of this type of impact test bench is mostly cylindrical, and it needs to be connected to the impact table with the help of a clamp ring, a connecting sleeve and other components, such as Figure 1 As shown in the figure, when the impact test is carried out, the impact between the piston rod and the clamp ring, the clamp ring and the connecting sleeve, and the connecting sleeve and the impact table will generate more high-frequency noise on the impact pulse waveform. Even if the frequency response of the impact table is very high, the pulse width cannot be made smaller. It is not applicable to the small pulse width impact test with a pulse width of less than 1ms. Utility Model Content

[0003] The utility model aims to overcome the shortcomings of the prior art and provide an impact test bench and a piston rod thereof suitable for a small pulse width impact test.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is an impact test bench suitable for small pulse width impact test, comprising:

[0005] Base;

[0006] A lifting cylinder, the lifting cylinder comprising a cylinder body arranged at the center of the base and extending vertically in the up-down direction, a piston rod and a piston coaxially arranged in the cylinder body, the upper end of the piston rod extending upward from the cylinder body and the base, and the outer wall surface of the piston being dynamically sealed with the inner wall surface of the cylinder body;

[0007] An impact table, the impact table being movably disposed above the piston rod;

[0008] The piston rod includes a rod body and a disc portion, the rod body is cylindrical, the upper end portion of the rod body is coaxially connected to the disc portion and formed as one piece, the lower end portion of the rod body is connected to the piston, the axis of the rod body and the center of the lower surface of the impact table are located in the same straight line, the upper end surface of the disc portion is in contact with and locked with the lower surface of the impact table, and when the lifting cylinder is actuated, the impact table can be driven to accelerate downward through the up and down movement of the piston rod to complete the impact test.

[0009] Preferably, the upper end of the rod body protrudes upward from the upper end surface of the disc portion to form a protrusion, and the protrusion is inserted into a blind hole opened in the center of the lower surface of the impact table. The height of the protrusion is less than the depth of the blind hole, and the protrusion is threadedly connected to the impact table.

[0010] Preferably, a projection area of ​​the disc portion on the lower surface of the impact table is not less than 80% of the area of ​​the lower surface of the impact table.

[0011] Preferably, a plurality of countersunk holes are provided on the disc portion, the countersunk ends of the countersunk holes are located on the lower end surface of the disc portion, the plurality of countersunk holes are evenly distributed around the axis of the disc portion, and the countersunk holes are arranged corresponding to the internal threaded connecting holes on the lower surface of the impact table.

[0012] Preferably, the rod body comprises an upper connecting section, a middle connecting section and a lower connecting section which are welded together in sequence from top to bottom, the upper connecting section is integrally formed with the disc portion and is located above the cylinder body, the middle connecting section is hollow inside, and the lower connecting section is connected to the piston.

[0013] Further preferably, the lower end of the upper connecting section has an inwardly contracted end, which is inserted into the upper end of the middle connecting section and threadedly connected thereto, and the upper end of the lower connecting section has an outwardly expanded end, which is inserted into the lower end of the middle connecting section and threadedly connected thereto.

[0014] Preferably, the impact test bench also includes a support plate connected to the upper end of the base, an iron platform arranged on the support plate, and a corrugated pad connected to the iron platform. A locking rod mechanism is passed through the center of the support plate, the locking rod mechanism is pressed on the upper end of the cylinder body and is sleeved on the piston rod, and the corrugated pad is located below the disc portion.

[0015] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is that the piston rod of the impact test bench includes: a cylindrical rod body, a disc portion coaxially connected to the upper end of the rod body and integrally formed therewith, the upper end of the rod body protrudes upward from the upper end surface of the disc portion to form a protrusion, the outer wall of the protrusion is provided with an external thread, a plurality of countersunk holes are opened on the disc portion, the countersunk ends of the countersunk holes are located on the lower end surface of the disc portion, and the plurality of countersunk holes are evenly distributed around the axis center line of the disc portion.

[0016] Preferably, the rod body comprises an upper connecting section, a middle connecting section and a lower connecting section which are welded and connected in sequence from top to bottom, and the upper connecting section is integrally formed with the disc portion.

[0017] Further preferably, the middle connecting section is hollow, the lower end of the upper connecting section has an inwardly contracted end, the inwardly contracted end is inserted into the upper end of the middle connecting section and threadedly connected thereto, and the upper end of the lower connecting section has an outwardly expanded end, the outwardly expanded end is inserted into the lower end of the middle connecting section and threadedly connected thereto.

[0018] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0019] The utility model provides an impact test bench suitable for a small pulse width impact test, comprising a base, a lifting cylinder and an impact table. The piston rod of the lifting cylinder comprises a cylindrical rod body and a disc portion coaxially connected to the upper end of the rod body and formed integrally therewith, so that the axis of the rod body and the center of the lower surface of the impact table are located in the same straight line, and the upper end surface of the disc portion is abutted and locked with the lower surface of the impact table, which can simplify the connection between the piston rod and the impact table and make the connection more compact, thereby greatly reducing high-frequency noise generated during the impact test, and is more suitable for a small pulse width impact test with a pulse width of less than 1ms; the piston rod of the impact test bench provided by the utility model can be directly connected to the impact table through the disc portion, and the number of components involved in the connection is small and the structure is simple. When performing the impact test, the high-frequency noise can be greatly reduced, and is particularly suitable for a small pulse width impact test. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a structural schematic diagram of the connection part between the piston rod and the impact table in the prior art.

[0021] Figure 2 It is a structural schematic diagram of a preferred embodiment of the impact test bench in the utility model.

[0022] Figure 3 yes Figure 2 Schematic diagram of the structure of the piston rod.

[0023] Figure 4 yes Figure 3 Schematic top view of .

[0024] Among them: 10. base; 11. air spring; 12. bottom plate; 20. lifting cylinder; 21. cylinder body; 22. piston rod; 221. rod body; 222. disc part; 223. protrusion; 224. countersunk hole; 225. upper connecting section; 226. middle connecting section; 227. lower connecting section; 228. retracted end; 229. expanded end; 23. piston; 30. impact table; 31. blind hole; 40. support plate; 41. locking rod mechanism; 50. iron platform; 60. corrugated pad; 71. prior art piston rod; 72. prior art impact table; 73. clamping ring; 74. connecting sleeve; 75. impact panel; 76. prior art iron platform. DETAILED DESCRIPTION

[0025] The up and down directions described in the present invention are Figure 2 The up and down directions in .

[0026] like Figures 2 to 4 As shown, the impact test bench suitable for small pulse width impact test provided by the utility model includes: a base 10, a lifting cylinder 20, an impact table 30, a support plate 40, an iron stack platform 50, and a corrugated pad 60, wherein the base 10 is vertically arranged in the up-down direction, and the bottom of the base 10 is supported on the bottom plate 12 by an air spring 11, and the plane where the bottom plate 12 is located is parallel to the horizontal plane; the lifting cylinder 20 includes a cylinder body 21 arranged at the center of the base 10 and extending vertically in the up-down direction, a piston rod 22 and a piston 23 coaxially arranged in the cylinder body 21, the upper end of the piston rod 22 extends upward from the cylinder body 21 and the base 10, and the outer wall surface of the piston 23 is dynamically sealed with the inner wall surface of the cylinder body 21; the impact table 30 is movably arranged above the piston rod 22, the support plate 40 is connected to the upper end of the base 10, and a locking rod mechanism 41 is passed through the center of the support plate 40, and the locking rod mechanism 41 is pressed on The upper end of the cylinder body 21 is sleeved on the piston rod 22, the iron platform 50 is arranged on the support plate 40, the corrugated pad 60 is connected to the iron platform 50, the corrugated pad 50 is located below the disc portion 222 and sleeved on the piston rod 22, and there is a gap between the inner wall surface of the corrugated pad 50 and the outer wall surface of the piston rod 22; in the present embodiment, the piston rod 22 comprises a rod body 221 and a disc portion 222, the rod body 221 is cylindrical, the upper end portion of the rod body 221 is coaxially connected with the disc portion 222 and integrally formed, the lower end portion of the rod body 221 is connected to the piston 23, the axis line of the rod body 221 and the center of the lower surface of the impact table 30 are located in the same straight line, the upper end surface of the disc portion 222 is in contact with and locked with the lower surface of the impact table 30, and when the lifting cylinder 20 is in action, the impact table 30 can be driven to accelerate downward and impact through the up and down movement of the piston rod 22 to complete the impact test.

[0027] The advantage of such a setting is that it can simplify the connection between the piston rod and the impact table and make the connection more compact, thereby greatly reducing the high-frequency noise generated during the impact test, and is more suitable for small pulse width impact tests with a pulse width of less than 1ms; specifically, the utility model integrates the prior art piston rod and the prior art impact panel, and uses a disc part to replace the impact panel and directly connect the impact table with bolts, thereby minimizing the impact of other factors on the impact table during the impact process, so that the impact table can generate a pure impact pulse waveform, so that the performance indicators of the impact test bench reach a new height and remain leading in the industry.

[0028] In order to enhance the effect of reducing high-frequency clutter, the upper end of the rod body 221 protrudes upward from the upper end surface of the disc portion 222 to form a protrusion 223, and the protrusion 223 is inserted into the blind hole 31 opened at the center of the lower surface of the impact table 30. The height of the protrusion 223 is less than the depth of the blind hole 31. The outer wall of the protrusion 223 is provided with an external thread, and the outer wall of the protrusion 223 is threadedly connected with the inner wall of the blind hole 31 on the impact table 30. The projection area of ​​the disc portion 222 on the lower surface of the impact table 30 is not less than the projection area of ​​the lower surface of the impact table 30. 80% of the surface area. In the present embodiment, the lower surface of the impact table 30 is circular in shape, and the diameter of the upper end surface of the disc portion 222 is equal to the diameter of the lower surface of the impact table 30. For the convenience of connection, further, a plurality of countersunk holes 224 are opened on the disc portion 222, and the countersunk ends of the countersunk holes 224 are located on the lower end surface of the disc portion 222. The plurality of countersunk holes 224 are evenly distributed around the axis of the disc portion 222, and the countersunk holes 224 are corresponding to the internal threaded connecting holes (not shown in the figure) on the lower surface of the impact table 30.

[0029] To facilitate processing and manufacturing, in this embodiment, the rod body 221 includes an upper connecting section 225, an intermediate connecting section 226 and a lower connecting section 227 which are welded and connected in sequence from top to bottom. The upper connecting section 225 is integrally formed with the disc portion 222 and is located above the cylinder body 21. The intermediate connecting section 226 is hollow inside, and the lower connecting section 227 is connected to the piston 23. Furthermore, the lower end of the upper connecting section 225 has an inwardly contracted end 228, which is inserted into the upper end of the intermediate connecting section 226 and threadedly connected thereto. The upper end of the lower connecting section 227 has an outwardly expanded end 229, which is inserted into the lower end of the intermediate connecting section 226 and threadedly connected thereto.

[0030] The piston rod of the impact test bench provided by the utility model can be directly connected to the impact table surface through the disc part, and the connection involves few parts and a simple structure. When performing an impact test, high-frequency noise can be greatly reduced, and the utility model is particularly suitable for small pulse width (pulse width less than 1ms) impact tests.

[0031] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. An impact test bench suitable for a small pulse width impact test, comprising: Base; A lifting cylinder, the lifting cylinder comprising a cylinder body arranged at the center of the base and extending vertically in the up-down direction, a piston rod and a piston coaxially arranged in the cylinder body, the upper end of the piston rod extending upward from the cylinder body and the base, and the outer wall surface of the piston being dynamically sealed with the inner wall surface of the cylinder body; An impact table, the impact table being movably disposed above the piston rod; Features: The piston rod includes a rod body and a disc portion, the rod body is cylindrical, the upper end portion of the rod body is coaxially connected to the disc portion and formed as one piece, the lower end portion of the rod body is connected to the piston, the axis of the rod body and the center of the lower surface of the impact table are located in the same straight line, the upper end surface of the disc portion is in contact with and locked with the lower surface of the impact table, and when the lifting cylinder is actuated, the impact table can be driven to accelerate downward through the up and down movement of the piston rod to complete the impact test.

2. The impact test bench suitable for small pulse width impact test according to claim 1, characterized in that: The upper end of the rod body protrudes upward from the upper end surface of the disc portion to form a protrusion, and the protrusion is inserted into a blind hole opened in the center of the lower surface of the impact table. The height of the protrusion is less than the depth of the blind hole, and the protrusion is threadedly connected to the impact table.

3. The impact test bench suitable for small pulse width impact test according to claim 1, characterized in that: The projection area of ​​the disk portion on the lower surface of the impact table is not less than 80% of the area of ​​the lower surface of the impact table.

4. The impact test bench suitable for small pulse width impact test according to claim 1, characterized in that: The disc portion is provided with a plurality of countersunk holes, the countersunk ends of the countersunk holes are located at the lower end surface of the disc portion, the plurality of countersunk holes are evenly distributed around the axis of the disc portion, and the countersunk holes are arranged correspondingly to the internal threaded connection holes on the lower surface of the impact table.

5. The impact test bench suitable for small pulse width impact test according to claim 1, characterized in that: The rod body includes an upper connecting section, a middle connecting section and a lower connecting section which are welded and connected in sequence from top to bottom. The upper connecting section is integrally formed with the disc portion and is located above the cylinder body. The middle connecting section is hollow inside, and the lower connecting section is connected to the piston.

6. The impact test bench suitable for small pulse width impact test according to claim 5, characterized in that: The lower end of the upper connecting section has an inwardly contracted end, which is inserted into the upper end of the middle connecting section and threadedly connected thereto, and the upper end of the lower connecting section has an outwardly expanded end, which is inserted into the lower end of the middle connecting section and threadedly connected thereto.

7. The impact test bench suitable for small pulse width impact test according to claim 1, characterized in that: The impact test bench also includes a support plate connected to the upper end of the base, an iron platform arranged on the support plate, and a corrugated pad connected to the iron platform. A locking rod mechanism is passed through the center of the support plate. The locking rod mechanism is pressed on the upper end of the cylinder body and is sleeved on the piston rod. The corrugated pad is located below the disc portion.

8. A piston rod of an impact test bench, characterized in that: include: A cylindrical rod body and a disc portion which is coaxially connected to the upper end of the rod body and formed integrally therewith, the upper end of the rod body protrudes upward from the upper end surface of the disc portion to form a protrusion, the outer wall of the protrusion is provided with an external thread, a plurality of countersunk holes are opened on the disc portion, the countersunk ends of the countersunk holes are located on the lower end surface of the disc portion, and the plurality of countersunk holes are evenly distributed around the axis of the disc portion.

9. The piston rod of the impact test bench according to claim 8, characterized in that: The rod body comprises an upper connecting section, a middle connecting section and a lower connecting section which are welded and connected in sequence from top to bottom, and the upper connecting section is integrally formed with the disc portion.

10. The piston rod of the impact test bench according to claim 9, characterized in that: The middle connecting section is hollow, the lower end of the upper connecting section has an inwardly contracted end, the inwardly contracted end is inserted into the upper end of the middle connecting section and threadedly connected thereto, and the upper end of the lower connecting section has an outwardly expanded end, the outwardly expanded end is inserted into the lower end of the middle connecting section and threadedly connected thereto.

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