Pulse load test equipment with variable loading rate

Abstract

The invention relates to the technical field of impact tests, in particular to a variable-loading-rate pulse load test device which comprises a base, a first operation table set, a test piece fixing groove and a single impact device. The single-time impact device comprises a pressure storage chamber, an impact cabin, a sealing piston, a high-pressure gas cylinder and a triggering mechanism, the impact cabin is provided with a first cavity, a second cavity and a third cavity, an exhaust hole is formed in the front side wall of the first cavity, a sealing block is arranged in the exhaust hole, a first through hole is formed in the front side wall of the third cavity, and a blocking strip is arranged in the first through hole; the trigger mechanism is connected with the blocking strip and the sealing block and controls the blocking strip and the sealing block to move at the same time. According to the invention, high-pressure gas can be used for driving, a high-loading-rate impact test is carried out, the loading rate is controlled through the adding amount of the high-pressure gas, related test research of pulse impact can be carried out, and the device has important significance on related research in the fields of protection engineering and disaster prevention and reduction.

Description

Technical Field

[0001] The invention relates to impact test equipment, in particular to pulse load test equipment with a variable loading rate. Background Art

[0002] Over the course of their service life, buildings (structures) may be subjected to a variety of external environmental loads, including structural collapse during demolition blasting, compaction work around the structure, blasting impact loads, and impact loads from natural disasters and accidents. These events are often accompanied by pulsed shock waves, such as the impact of rocks of varying sizes from landslides on protective embankments, the impact of rocks from structural collapse on surrounding structures during demolition blasting, and the impact of fragments of varying sizes falling from damaged superstructures. Generally speaking, different locations on the same building (structure) experience different mechanical responses when subjected to different impact loads. Existing explosive pulse load testing equipment is unable to generate different impact loads at different locations. Therefore, the development of pulse load testing equipment with a variable loading rate is of great significance to research in protective engineering and disaster prevention and mitigation. Summary of the Invention

[0003] In response to the problems raised in the background technology, the purpose of the present invention is to provide a pulse load testing equipment with a variable loading rate. The testing equipment can use high-pressure gas drive to achieve a high loading rate, and control the loading rate by the amount of high-pressure gas added, so as to carry out relevant experimental research on variable pulse impact.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A variable loading rate pulse load test device comprises a base, a first operating table group, a specimen fixing groove and a single impact device, wherein the bottom of the first operating table group is fixedly connected to the base, and the specimen fixing groove is connected to the base below the first operating table group; The single impact device includes a pressure storage chamber, an impact chamber, a sealing piston, a high-pressure gas cylinder, and a trigger mechanism, and the impact chamber and the trigger mechanism are both mounted on the first operating table assembly; the impact chamber has a first chamber, a second chamber, and a third chamber, the upper end of the first chamber is closed, the lower end of the first chamber is connected to the upper end of the second chamber, the lower end of the second chamber is connected to the upper end of the third chamber, and the lower end of the third chamber has an outlet; the inner cavity of the first chamber and the inner cavity of the second chamber are both cylindrical cavities, the inner cavity of the first chamber and the inner cavity of the second chamber are coaxial and have the same diameter, and the lower end of the inner cavity of the second chamber is provided with a narrow ring, the inner diameter of the narrow ring is smaller than the inner cavity diameter of the second chamber; The sealing piston is slidably arranged in the inner cavity of the first chamber and the inner cavity of the second chamber. The upper end of the sealing piston is connected to the second spring through the piston rod. The upper end of the second spring is connected to the closed surface of the upper end of the first chamber. When the sealing piston moves to the narrow ring at the lower end of the inner cavity of the second chamber, the lower end of the sealing piston seals the inner hole of the narrow ring; The first chamber is provided with a valve, which is connected to the high-pressure gas cylinder through an air guide tube, and the opening of the valve in the inner cavity of the first chamber is located above the sealing piston; the front side wall of the first chamber is provided with an exhaust hole, and a sealing block is provided in the exhaust hole; The second chamber is connected to a fixed air-guiding channel, the other end of which is connected to the pressure storage chamber; the opening of the fixed air-guiding channel is located above the narrow ring; The front side wall of the third chamber is provided with a first through hole, a blocking bar is provided in the first through hole, an impact cylinder is provided in the third chamber, and the blocking bar prevents the impact cylinder from falling; The trigger mechanism is connected to the blocking bar and the sealing block respectively, and the trigger mechanism controls the movement of the blocking bar and the sealing block simultaneously.

[0005] The trigger mechanism includes a first connecting rod, a second connecting rod and a trigger, the trigger has an elastically extendable output shaft, and the elastic extension direction of the output shaft is parallel to the axis of the first through hole; one end of the second connecting rod is connected to the output shaft of the trigger, and the other end is connected to the blocking bar; the lower end of the first connecting rod is connected to the second connecting rod, and the upper end of the first connecting rod is connected to the sealing block through a cross rod, and the cross rod is parallel to the axis of the exhaust hole.

[0006] The trigger includes a shell, a baffle, a first spring, a gear rod and a cylinder. A slide groove is provided in the shell, and the baffle is slidably connected to the slide groove. One end of the output shaft passes through the rear side wall of the shell, and the other end is connected to the baffle. The first spring is sleeved on the output shaft, and the first spring is located between the rear side wall of the shell and the baffle; one end of the gear rod is movably passed through a side wall of the shell, and the other end is connected to the cylinder; the gear rod is located on the front side of the baffle.

[0007] The lower end of the sealing piston is provided with a sealing round block. When the sealing piston moves to the narrow mouth ring at the lower end of the inner cavity of the second chamber, the sealing round block seals the inner hole of the narrow mouth ring.

[0008] A first flange is fixedly connected to the lower end of the first chamber, a second flange is fixedly connected to the upper end of the second chamber, a third flange is fixedly connected to the lower end of the second chamber, and a fourth flange is fixedly connected to the upper end of the third chamber. A first sealing gasket is provided between the first flange and the second flange, a second sealing gasket is provided between the third flange and the fourth flange, the first flange is connected to the second flange, and the third flange is connected to the fourth flange.

[0009] The first operating table group includes a first operating table and a first support column. The lower part of the first support column is connected to the base. The first operating table is fixedly installed on the upper part of the first support column. A slide rail is provided on the first operating table. A slider is provided in the slide rail. The impact cabin is installed on the slider and is fixedly connected to the slider.

[0010] N sliders are arranged in the slide rail, and each slider is respectively provided with an impact cabin.

[0011] A second operating table group is provided on the base, and the second operating table group includes a second support column and a second operating table. The bottom of the second support column is fixedly mounted on the base, and the second operating table is mounted on the upper part of the second support column. A starting device is fixedly connected to the second operating table, and the starting device is connected to the trigger of the trigger mechanism through a trigger connection line.

[0012] The present invention provides a variable loading rate pulse load testing device that can be driven by high-pressure gas to conduct high-loading rate impact tests. The loading rate can be controlled by the amount of high-pressure gas added, enabling research related to pulse impact tests. This device is of great significance to research related to protective engineering and disaster prevention and mitigation. Specifically, high-pressure gas provided by a high-pressure gas cylinder enters the third chamber through a narrow ring. When the high-pressure gas encounters the impact cylinder, it pushes the impact cylinder to move. At this time, the blocking bar has popped out, and the impact cylinder is vertically free. Driven by gravity and high-pressure gas, the impact cylinder is ejected from the third chamber and impacts the specimen in the specimen fixing groove. Testers can determine the pressure in the pressure storage chamber by reading the value on the pressure gauge. Different loading rates can be achieved for each single impact device by using high-pressure gas at different pressures. Each single impact device can be charged with high-pressure gas at different pressures as required, resulting in a different loading rate for each single impact device to achieve pulse loading. Simultaneously, a slider can move within a slide rail, which can drive the impact chamber and trigger mechanism to move synchronously, achieving loading at different positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 Schematic diagram of the structure of the first operating table group in the present invention; Figure 3 This is a schematic diagram of the structure of the single impact device; Figure 4 Schematic diagram of the structure of the trigger mechanism of the present invention; Figure 5 Schematic diagram of the structure of the baffle in the present invention; Figure 6 Schematic diagram of the structure of the first fixing plate in the present invention; Figure 7is a cross-sectional view of a single impact device in the present invention; Figure 8 An exploded view of the single impact device of the present invention; Figure 9 Schematic diagram of the structure of the second chamber in the present invention; Figure 10 It is a three-dimensional layout diagram of the present invention; Figure 11 A three-dimensional layout diagram of the present invention from another perspective; Figure 12 It is an overall side view of the present invention; Figure 13 It is the overall front view of the present invention; Figure 14 It is an overall top view of the present invention.

[0014] Numbers in the figure: 1, base, 2, trigger connection line, 3, trigger mechanism, 4, impact chamber, 5, air guide tube, 6, high-pressure gas cylinder, 7, first operating table, 8, first support column, 9, slide block, 10, speed meter, 11, specimen fixing groove, 12, second support column, 13, second operating table, 14, starting device, 15, slide rail, 16, first chamber, 17, pressure gauge, 18, pressure storage chamber, 19, second chamber, 20, third chamber, 21, first through hole, 22, cylinder, 23, gear lever, 24, first connecting rod, 25, sealing block, 26 blocking bar, 27. second connecting rod, 28. fixed rod, 29. first spring, 30. baffle, 30a, slide bar, 31. first fixed plate, 32. second fixed plate, 33. third fixed plate, 34. fourth fixed plate, 35. slide groove, 36. valve, 37. exhaust hole, 38. second spring, 39. piston rod, 40. impact cylinder, 41. sealing piston, 42. sealing round block, 43. air guide fixed channel, 44. second sealing gasket, 45. first flange, 46. second flange, 47. third flange, 48. fourth flange, 49. narrow ring. DETAILED DESCRIPTION

[0015] To help those skilled in the art better understand the technical solutions of the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly or indirectly connected to the other element. When an element is referred to as being "connected to" another element, it may be directly or indirectly connected to the other element. The terms "left" and "right" used in this application document to indicate directions are based on the specific structures shown in the drawings and do not constitute structural limitations.

[0016] Example 1: Figure 1 、 Figure 10-14As shown, the present invention provides a pulse load test equipment with a variable loading rate, which mainly includes a base 1, a first operating table group, a specimen fixing groove 11, a second operating table group and a single impact device, and the single impact device includes a high-pressure gas cylinder 6, an impact chamber 4 and a trigger mechanism 3; specifically, a first operating table group and a second operating table group that play a supporting role are installed and arranged on the base 1, the first operating table group is mainly used to install and support the impact chamber 4 and the trigger mechanism 3, and the second operating table group is mainly used to install and support the starting device 14. The bottoms of the first operating table group and the second operating table group are fixedly connected to the base 1, and the bottoms of the first operating table group and the second operating table group are fixedly connected to the base 1. A specimen fixing groove 11 is installed on the lower base 1. The specimen fixing groove 11 is used to fix and place the specimen. The specimen fixing groove 11 is fixedly connected to the base 1. A starting device 14 for starting the trigger mechanism 3 is fixedly connected to the second operating table group. A group of impact cabins 4 and a group of trigger mechanisms 3 are installed on the first operating table group. The starting device 14 is connected to a group of trigger connecting lines 2. The starting device 14 is connected to the corresponding trigger mechanisms 3 through a group of trigger connecting lines 2. A high-pressure gas cylinder 6 for filling the corresponding impact cabin 4 with high-pressure gas is installed on the first operating table group. The high-pressure gas cylinder 6 is connected to the corresponding impact cabin 4 through an air duct 5.

[0017] like Figure 2 As shown, the first operating platform group includes a first operating platform 7 and a first support column 8, wherein the first support column 8 is fixedly mounted on the base 1, the first operating platform 7 is mounted on the upper part of the first support column 8 and fixedly mounted together with the first support column 8, a slide rail 15 is provided on the first operating platform 7, a group of sliders 9 are provided in the slide rail 15, each of the sliders 9 is provided with an impact capsule 4, and the impact capsule 4 is fixedly mounted on the slider 9. The second operating platform group for mounting and supporting the starting device 14 includes a second support column 12 and a second operating platform 13, the bottom of the second support column 12 is fixedly mounted on the base 1, the second operating platform 13 is mounted on the upper part of the second support column 12 and fixedly connected to the second support column 12, and the starting device 14 is fixedly connected to the second operating platform 13.

[0018] like Figure 4As shown, the trigger mechanism 3 includes a shell, a cylinder 22, a shift rod 23, a first connecting rod 24, a sealing block 25, a blocking bar 26, a second connecting rod 27, a fixing rod 28, a first spring 29 and a baffle 30, wherein the shell includes a first fixing plate 31, a second fixing plate 32, a third fixing plate 33 and a fourth fixing plate 34, and the cylinder 22 is installed on the shell, one end of the cylinder 22 is fixedly connected to one side of the second fixing plate 32, and the driving rod end of the cylinder 22 is connected to the shift rod 23 for limiting the baffle 30, the working end of the shift rod 23 passes through the second fixing plate 32, and the third fixing plate 33 is fixedly connected to one side of the second fixing plate 32, and the fourth fixing plate 34 is fixedly connected to one side of the third fixing plate 33, and the fixing rod 28 is fixedly provided on the lower side of the third fixing plate 33, and the other side of the fixing rod 28 is fixedly connected to one side of the corresponding slider 9, the second fixing plate 32, The lower ends of the third fixing plate 33 and the fourth fixing plate 34 are fixedly connected to the first fixing plate 31, and the inner sides of the second fixing plate 32 and the fourth fixing plate 34 are symmetrically provided with sliding grooves 35 for guiding the sliding bar 30a. Sliding bars 30a for guiding are provided on both sides of the baffle 30, and the sliding bar 30a is movably installed in the sliding grooves 35. A second connecting rod 27 is fixedly connected to one side of the baffle 30, and the other end of the second connecting rod 27 passes through the third fixing plate 33 and is fixedly connected to the blocking bar 26. The blocking bar 26 is used to limit the impact block, and the upper part of the blocking bar 26 is fixedly connected to the first connecting rod 24, and the other side of the first connecting rod 24 is fixedly connected to the sealing block 25 used for sealing the exhaust hole 37. A first spring 29 for pushing the baffle 30 to move is fixedly connected to one side of the baffle 30, and the other end of the first spring 29 is fixedly connected to the third fixing plate 33.

[0019] like Figure 3 、 Figure 7 and Figure 8As shown, the impact chamber 4 for performing the impact test includes a first chamber 16, a pressure storage chamber 18, a second chamber 19 and a third chamber 20. A valve 36 is provided on one side of the first chamber 16, and an exhaust hole 37 for exhaust is provided on the other side of the first chamber 16. The valve 36 is connected to the high-pressure gas cylinder 6 through the connecting air guide pipe 5. A sealing block 25 is provided in the exhaust hole 37. A first flange 45 is fixedly connected to the lower end of the first chamber 16, a second flange 46 is fixedly connected to the upper end of the second chamber 19, a third flange 47 is fixedly connected to the lower end of the second chamber 19, and a fourth flange 48 is fixedly connected to the upper end of the third chamber 20. A first sealing gasket is provided between the first flange 45 and the second flange 46, and a second sealing gasket 44 is provided between the third flange 47 and the fourth flange 48. The first flange 45 and the second flange 46 are fastened together by bolts and nuts, and the third flange 47 and the fourth flange 48 are fastened together by bolts and nuts. There is a fixed gas guide channel 43 for gas transmission, and a pressure storage chamber 18 is provided at the other end of the fixed gas guide channel 43. A pressure gauge 17 is installed at the upper end of the pressure storage chamber 18. A second spring 38 is fixedly connected to the top wall of the inner cavity of the first chamber 16, wherein the lower end of the second spring 38 is fixedly sleeved on the piston rod 39, and a sealing piston 41 is fixedly connected to the lower end of the piston rod 39. A sealing round block 42 is fixedly provided at the lower end of the sealing piston 41. A first through hole 21 is provided on one side of the third chamber 20. A blocking strip 26 is provided in the first through hole 21, a narrow-mouth ring 49 is fixedly connected to the inner side of the second chamber 19, and an impact cylinder 40 is provided in the third chamber 20. It should be noted that a first sealing ring is provided on the inner side of the narrow-mouth ring 49, and a second sealing ring is provided on the outer side of the sealing round block 42. The outer circle of the sealing round block 42 can be in sealing contact with the inner hole of the narrow-mouth ring 49. The length of the impact cylinder 40 needs to be (slightly) smaller than the distance from the first through hole 21 to the upper end of the third chamber 20.

[0020] The working process of the present invention during specific use is as follows: first, the operator can fix the test specimen in the specimen fixing groove 11, release the obstruction of the gear rod 23, and drive the second connecting rod 27 to pull out the blocking bar 26 by moving the baffle 30, so as to pre-insert the impact cylinder 40 into the third chamber 20, and then push the baffle 30 to move in the direction of the third fixing plate 33, and the baffle 30 drives the second connecting rod 27 to move, and the second connecting rod 27 drives the blocking bar 26 to enter the first through hole 21, and the blocking bar 26 prevents the impact cylinder 40 from sliding. At the same time, the second connecting rod 27 drives the sealing block 25 to enter the exhaust hole 37 through the first connecting rod 24, so as to achieve sealing of the first chamber 16; when the baffle 30 pushes the first spring 29 to be compressed into place, the cylinder 22 is started, and the driving rod of the cylinder 22 drives the outer end of the gear rod 23 to extend to block the baffle 30; Then, the high-pressure gas cylinder 6 and the valve 36 can be opened, and the high-pressure gas enters the first chamber 16 through the gas guide tube 5. The high-pressure gas pushes the sealing piston 41 to move in the first chamber 16, and the sealing piston 41 drives the second spring 38 to move through the piston rod 39. At this time, the second spring 38 is in a stretched state; as the high-pressure gas continues to be added, the sealing piston 41 enters the second chamber 19. When the sealing piston 41 moves to the bottom of the second chamber 19, the sealing round block 42 at the lower part of the sealing piston 41 just enters the narrow ring 49 and realizes the sealing of the second chamber 19. At this time, the high-pressure gas can enter the pressure storage chamber 18 through the gas guide fixed channel 43. The pressure of the pressure storage chamber 18 is observed by the pressure gauge 17, and high-pressure gases of different pressures are added according to the required loading rate. When all the high-pressure gases in the shock chamber 4 are fully loaded, the high-pressure gas cylinder 6 and the valve 36 are closed, and the starting device 14 is turned on. The starting device 14 controls the cylinder 22 on the trigger mechanism 3 through the trigger connection line 2. After receiving the command, the cylinder 22 drives the gear lever 23 to retract. At this time, under the elastic force of the first spring 29, the baffle 30 is pushed (moved) outward. The baffle 30 drives the sealing block 25 and the blocking bar 26 to move outward through the second connecting rod 27 and the first connecting rod 24. When the sealing block 25 is pushed out from the exhaust hole 37, the high-pressure gas is quickly discharged from the exhaust hole 37. As the high-pressure gas is discharged, the sealing piston 41 begins to move under the tension of the second spring 38. When the sealing piston 41 moves back, it drives the sealing block 42 to move together. When the sealing block 42 separates from the narrow ring 49, the seal fails. At this time, the sealing piston 41 is located just above the fixed gas guide channel 43. The high-pressure gas in the pressure storage chamber 18 enters the second chamber 19 through the fixed gas guide channel 43 and enters the third chamber 20 through the narrow ring 49. The high-pressure gas encounters the impact cylinder 40 and pushes it downward. At this time, the blocking bar 26 has popped out and the impact cylinder 40 is not restrained vertically. Driven by gravity and high-pressure gas, the impact cylinder 40 is ejected from the third chamber 20 and hits the specimen in the specimen fixing groove 11. The velocimeter 10 is started and can measure the muzzle velocity of the impact cylinder 40 .

[0021] The operator can judge the pressure of the pressure storage chamber 18 by the value of the pressure gauge 17, and control it by selecting springs with different elastic coefficients. Different loading rates of the single impact device can be achieved by high-pressure gases of different pressures. Each single impact device adds high-pressure gases of different pressures according to demand. The loading rate of each single impact device is different to achieve pulse loading. The slider 9 can move in the slide rail 15. The slider 9 can drive the single impact device to move to achieve loading operations at different positions. The measurement of the specimen data requires various existing sensors and strain gauges. It is an existing mature technology and will not be repeated here. The above shows and describes the basic principles, main features and advantages of the present invention. Technical personnel in this industry should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the invention to be protected.

[0022] The parts not described in detail in this invention are prior art.

Claims

1. A pulse load test device with a variable loading rate, comprising a base (1), a first operating table group, a specimen fixing groove (11) and a single impact device, wherein: The bottom of the first operating table group is fixedly connected to the base (1), and a specimen fixing groove (11) is connected to the base (1) below the first operating table group; The single impact device comprises a pressure storage chamber (18), an impact chamber (4), a sealing piston (41), a high-pressure gas cylinder (6) and a trigger mechanism (3), wherein the impact chamber (4) and the trigger mechanism (3) are both mounted on a first operating table group; the impact chamber (4) comprises a first chamber (16), a second chamber (19) and a third chamber (20); the upper end of the first chamber (16) is closed, the lower end of the first chamber (16) is connected to the upper end of the second chamber (19), the lower end of the second chamber (19) is connected to the upper end of the third chamber (20), and the lower end of the third chamber (20) has an outlet; the inner cavity of the first chamber (16) and the inner cavity of the second chamber (19) are both cylindrical cavities, the inner cavity of the first chamber (16) and the inner cavity of the second chamber (19) are coaxial and have the same diameter, and the lower end of the inner cavity of the second chamber (19) is provided with a narrow ring (49), and the inner diameter of the narrow ring (49) is smaller than the inner cavity diameter of the second chamber (19); The sealing piston (41) is slidably disposed in the inner cavities of the first chamber (16) and the second chamber (19); the upper end of the sealing piston (41) is connected to a second spring (38) via a piston rod (39); the upper end of the second spring (38) is connected to a closed surface at the upper end of the first chamber (16); when the sealing piston (41) moves to the narrow ring (49) at the lower end of the inner cavity of the second chamber (19), the lower end of the sealing piston (41) seals the inner hole of the narrow ring (49); The first chamber (16) is provided with a valve (36), the valve (36) being connected to the high-pressure gas cylinder (6) via an air guide tube (5), the opening of the valve (36) in the inner cavity of the first chamber (16) being located above the sealing piston (41); a vent hole (37) is provided on the front side wall of the first chamber (16), and a sealing block (25) is provided in the vent hole (37); The second chamber (19) is connected to a fixed air-conducting channel (43), and the other end of the fixed air-conducting channel (43) is connected to a pressure storage chamber (18); the opening of the fixed air-conducting channel (43) is located above the narrow ring (49); A first through hole (21) is provided on the front side wall of the third chamber (20), a blocking bar (26) is provided in the first through hole (21), an impact cylinder (40) is provided in the third chamber (20), and the blocking bar (26) blocks the impact cylinder (40) from falling; The trigger mechanism (3) is respectively connected to the blocking bar (26) and the sealing block (25), and the trigger mechanism (3) controls the movement of the blocking bar (26) and the sealing block (25) simultaneously.

2. The variable loading rate pulse load test equipment according to claim 1, characterized in that: The trigger mechanism (3) comprises a first connecting rod (24), a second connecting rod (27) and a trigger, wherein the trigger has an output shaft that can be elastically retracted, and the elastic retracting direction of the output shaft is parallel to the axis of the first through hole (21); one end of the second connecting rod (27) is connected to the output shaft of the trigger, and the other end is connected to the blocking bar (26); the lower end of the first connecting rod (24) is connected to the second connecting rod (27), and the upper end of the first connecting rod (24) is connected to the sealing block (25) via a cross bar, and the cross bar is parallel to the axis of the exhaust hole (37).

3. The variable loading rate pulse load test equipment according to claim 2, characterized in that: The trigger comprises a housing, a baffle (30), a first spring (29), a shift rod (23) and a cylinder (22); a slide groove (35) is provided in the housing, the baffle (30) is slidably connected to the slide groove (35); one end of the output shaft passes through the rear side wall of the housing, and the other end is connected to the baffle (30); the first spring (29) is sleeved on the output shaft, and the first spring (29) is located between the rear side wall of the housing and the baffle (30); one end of the shift rod (23) is movably passed through a side wall of the housing, and the other end is connected to the cylinder (22); the shift rod (23) is located on the front side of the baffle (30).

4. The variable loading rate pulse load test equipment according to claim 1, characterized in that: The sealing piston (41) has a sealing round block (42) at the lower end. When the sealing piston (41) moves to the narrow ring (49) at the lower end of the inner cavity of the second chamber (19), the sealing round block (42) seals the inner hole of the narrow ring (49).

5. The variable loading rate pulse load test equipment according to claim 1, characterized in that: A first flange (45) is fixedly connected to the lower end of the first chamber (16), a second flange (46) is fixedly connected to the upper end of the second chamber (19), a third flange (47) is fixedly connected to the lower end of the second chamber (19), a fourth flange (48) is fixedly connected to the upper end of the third chamber (20), a first sealing gasket is arranged between the first flange (45) and the second flange (46), a second sealing gasket (44) is arranged between the third flange (47) and the fourth flange (48), the first flange (45) is connected to the second flange (46), and the third flange (47) is connected to the fourth flange (48).

6. The variable loading rate pulse load test device according to claim 1 is characterized in that: The first operating table assembly comprises a first operating table (7) and a first supporting column (8), the lower portion of the first supporting column (8) being connected to the base (1), the first operating table (7) being fixedly mounted on the upper portion of the first supporting column (8), a slide rail (15) being arranged on the first operating table (7), a slide block (9) being arranged in the slide rail (15), and the impact chamber (4) being mounted on the slide block (9) and fixedly connected to the slide block (9).

7. The variable loading rate pulse load test equipment according to claim 6 is characterized in that: N sliding blocks (9) are arranged in the sliding rail (15), and each sliding block (9) is respectively provided with an impact chamber (4).

8. The variable loading rate pulse load test device according to claim 1 is characterized in that: The base (1) is provided with a second operating table group, the second operating table group comprising a second support column (12) and a second operating table (13), the bottom of the second support column (12) is fixedly mounted on the base (1), the second operating table (13) is mounted on the top of the second support column (12), and a starting device (14) is fixedly connected to the second operating table (13), and the starting device (14) is connected to a trigger of the trigger mechanism (3) via a trigger connection line (2).

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