Return cylinder for horizontal impact response spectrum test bed

Abstract

The invention provides a return air cylinder for a horizontal impact response spectrum test bed, which is used for driving an impact platform to return and comprises a cylinder barrel, a front end cover, a rear end cover, a piston which is arranged in the cylinder barrel in a sliding manner and divides an inner cavity of the cylinder barrel into a front cavity and a rear cavity, and an air cylinder rod of which two ends are respectively connected with the impact platform and the piston, an air inlet channel for air inlet of a front cavity and an air outlet channel for air outlet of the front cavity are arranged in a front end cover, the air inlet channel and the air outlet channel are alternately connected and disconnected, a normally-opened air channel for air inlet and air outlet of a rear cavity is arranged in a rear end cover, and the diameter of the normally-opened air channel is larger than or equal to that of the air outlet channel. The diameter of the exhaust passage is larger than or equal to two times of the diameter of the air inlet passage, air can be fed from the air inlet passage to drive the impact platform to return, high air inlet and outlet speed can be achieved by means of the characteristic that the diameters of the exhaust passage and the normally-opened passage are large, and interference on impact action is avoided. And the accuracy and reproducibility of the test result of the horizontal impact response spectrum test bed are better.

Description

[0001] Divisional Application Statement

[0002] This application is a divisional application of the Chinese invention patent application with the invention name of "A Horizontal Shock Response Spectrum Test Bench", application number 202211322945.6, filed on October 27, 2022. Technical Field

[0003] The present invention belongs to the technical field of testing instruments, and particularly relates to a return cylinder for a horizontal shock response spectrum test bench. Background Art

[0004] The shock response spectrum is usually abbreviated as "shock spectrum", which is a graph showing the relationship between the maximum value of the response and the natural frequency or natural period of vibration of a single-degree-of-freedom vibration system when it is subjected to a certain shock, and is widely used in structural dynamics and the design of buffer and vibration damping systems.

[0005] A horizontal shock response spectrum test bench is an experimental instrument for testing the horizontal shock response spectrum, usually including a test bench base, a shock platform slidably arranged on the test bench base, a response platform for bearing the shock, and a shock cylinder for driving the shock platform to generate an impact force. For example, Chinese patent CN106525373A discloses such a horizontal shock response spectrum measuring device. Since the impact speed of the shock platform needs to be determined according to experimental requirements, the intake end of the shock cylinder is relatively complex, and it is not convenient to drive the shock platform to return. If a return cylinder is added, since the action direction of the return cylinder is basically the same as that of the shock cylinder, it can only be arranged in the base below the shock cylinder, and a window needs to be opened on the base to connect the shock platform, which has a greater impact on the strength of the base and is not convenient for installation and maintenance. At the same time, when a conventional cylinder is used as the return cylinder, due to the slow intake and exhaust speed, it is easy to interfere with the impact action of the shock cylinder, resulting in poor accuracy and reproducibility of the horizontal shock response spectrum test results. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings in the prior art and provide a return cylinder for a horizontal shock response spectrum test bench, which has a fast intake and exhaust speed and does not interfere with the impact action of the shock cylinder, so that the accuracy and reproducibility of the test results of the horizontal shock response spectrum test bench are better.

[0007] To achieve the above object, the technical solution adopted by the present invention is a return cylinder for a horizontal shock response spectrum test bench, which is used to drive the shock platform of the horizontal shock response spectrum test bench to return. The return cylinder includes:

[0008] A cylinder barrel;

[0009] A front end cover connected to the front end of the cylinder barrel;

[0010] A rear end cover connected to the rear end of the cylinder barrel;

[0011] A piston slidably arranged within the cylinder barrel and partitioning the inner cavity of the cylinder barrel into a front cavity and a rear cavity;

[0012] A cylinder rod passing through the impact plate and connected to the rear end of the impact platform, with the end of the cylinder rod away from the impact platform being connected to the piston;

[0013] An air intake passage for the front cavity to intake air and an air exhaust passage for the front cavity to exhaust air are provided within the front end cover. The air intake passage and the air exhaust passage are alternately opened and closed. A constantly open air passage for the rear cavity to intake and exhaust air is provided within the rear end cover. The constantly open air passage communicates with the outside atmosphere. The diameter of the constantly open air passage is greater than or equal to the diameter of the air exhaust passage, and the diameter of the air exhaust passage is greater than or equal to twice the diameter of the air intake passage.

[0014] Preferably, an annular groove is provided at the end of the cylinder rod, and a clamping block matching the annular groove is connected to the rear end of the impact platform, with a part of the clamping block extending into the annular groove.

[0015] Preferably, a control valve for controlling the alternate opening and closing of the air intake passage and the air exhaust passage is further provided on the front end cover. The control valve includes a valve body, a valve cavity provided within the valve body, and a valve core. The valve cavity extends in the front-rear direction and is connected in series to the air intake passage and the air exhaust passage. The valve core is slidably arranged within the valve cavity. A connecting air passage matching the air intake passage is provided on the valve core. When the valve core moves backward to the extreme position, the air intake passage is connected through the connecting air passage and the air exhaust passage is disconnected. When the valve core moves forward to the extreme position, the air intake passage is disconnected and the air exhaust passage is connected.

[0016] Further preferably, the valve cavity includes a first valve cavity and a second valve cavity. The axis lines of the first valve cavity and the second valve cavity are symmetrically distributed on both sides of the axis line of the cylinder barrel. The first valve cavity is connected in series to the air intake passage, and the second valve cavity is connected in series to the air exhaust passage. The valve core includes a first valve core arranged within the first valve cavity and a second valve core arranged within the second valve cavity. The connecting air passage is provided on the first valve core.

[0017] Further preferably, a spring for driving the first valve core to move forward is further provided within the first valve cavity, and an annular spring groove for accommodating the front end of the spring is provided on the rear end face of the first valve core.

[0018] Further preferably, the actions of the first valve core and the second valve core moving backward to the extreme position are synchronized to achieve the alternate opening and closing of the air intake passage and the air exhaust passage.

[0019] Further preferably, a driving assembly for driving the first valve core and the second valve core to move backward synchronously is further provided on the front end cover. The driving assembly includes a valve cover plate connected to the front end face of the valve body and a driving air passage provided in the valve cover plate for supplying and exhausting air to and from the first valve cavity and the second valve cavity.

[0020] Further preferably, an annular air groove is provided on the rear end face of the valve cover plate, and the driving air passage is synchronously communicated with the first valve cavity and the second valve cavity through the annular air groove.

[0021] Preferably, the impact plate is used to drive the impact platform to move forward. The ends of the cylinder rods of two impact cylinders arranged side by side and spaced apart in the left - right direction are connected to the impact plate, and the return cylinder is arranged between the two impact cylinders.

[0022] Due to the application of the above - mentioned technical solution, the present invention has the following advantages compared with the prior art:

[0023] The return cylinder for the horizontal shock response spectrum test bench provided by the present invention is used to drive the impact platform to return. It includes a cylinder barrel, a front end cover connected to the front end of the cylinder barrel, a rear end cover connected to the rear end of the cylinder barrel, a piston slidably arranged in the cylinder barrel to divide the inner cavity of the cylinder barrel into a front cavity and a rear cavity, and a cylinder rod passing through the impact plate and connected to the rear end of the impact platform. The end of the cylinder rod away from the impact platform is connected to the piston. By providing an air intake passage for the front cavity and an air exhaust passage for the front cavity in the front end cover, the air intake passage and the air exhaust passage are alternately opened and closed, and a constant - ventilation passage for supplying and exhausting air to and from the rear cavity is provided in the rear end cover. The diameter of the constant - ventilation passage is greater than or equal to the diameter of the air exhaust passage, and the diameter of the air exhaust passage is greater than or equal to twice the diameter of the air intake passage. It can not only intake air from the air intake passage to drive the impact platform to return, but also utilize the characteristics of the large diameters of the air exhaust passage and the constant - ventilation passage to achieve a higher air intake and exhaust speed, avoiding interference with the impact action, and making the accuracy and reproducibility of the test results of the horizontal shock response spectrum test bench better. Description of the Drawings

[0024] Figure 1 is a top - view schematic diagram of a preferred embodiment of the present invention.

[0025] Figure 2 is Figure 1 a partially enlarged cross - sectional view of the return cylinder in

[0026] Figure 3 is Figure 2 a partially enlarged view of part A in

[0027] Figure 4Yes Figure 1 A partially enlarged sectional view of the return cylinder. At this time, the impact platform is in the return position, and both the first valve core and the second valve core are in the second working position.

[0028] Figure 5 Yes Figure 4 A partially enlarged view of part B in

[0029] Figure 6 Yes Figure 1 A partially enlarged sectional view of the return cylinder. At this time, the impact platform is in the return position, the first valve core is in the first working position, and the second valve core is in the second working position.

[0030] Figure 7 Yes Figure 6 A partially enlarged view of part C in

[0031] Wherein: 10. Test bench base; 11. Load-bearing tabletop; 20. Fixed seat; 30. Response platform; 40. Impact platform; 41. Block; 50. Impact cylinder; 51. Cylinder rod; 52. Impact plate; 60. Return cylinder; 61. Cylinder rod; 611. Annular groove; 62. Cylinder barrel; 621. Front chamber; 622. Rear chamber; 63. Front end cover; 6311. First intake air passage; 6312. Second intake air passage; 6321. First exhaust air passage; 6322. Second exhaust air passage; 633. Control valve; 6331. Valve body; 6332. First valve cavity; 6333. Second valve cavity; 6334. First valve core; 6335. Second valve core; 6336. First connecting air passage; 6337. Second connecting air passage; 6338. Spring; 6339. Annular spring groove; 634. Driving assembly; 6341. Valve cover plate; 6342. Driving air passage; 6343. Annular air groove; 635. Intake port; 636. Exhaust port; 64. Rear end cover; 641. Constant ventilation air passage; 65. Piston; 70. Reset cylinder. Detailed implementation manners

[0032] The following describes the preferred embodiments of the present invention in detail with reference to the accompanying drawings, so that the advantages and features of the present invention are more easily understood by those skilled in the art, thereby making the protection scope of the present invention more clearly defined.

[0033] The front-back, left-right directions described in the present invention are Figure 1 the up-down, left-right directions in Figure 2 , Figure 4 , Figure 6 the up-down, left-right directions in

[0034] As shown in Figures 1 to 7As shown in the figure, the horizontal shock response spectrum test bench provided by the present invention includes: a test bench base 10, a fixed seat 20, a response platform 30, a shock platform 40, a shock cylinder 50, a return cylinder 60, and a reset cylinder 70. Among them, the test bench base 10 is a frame-type base and has a bearing tabletop 11 extending horizontally in the front-rear direction. The fixed seat 20, the response platform 30, the shock platform 40, and the shock cylinder 50 are sequentially arranged on the bearing tabletop 11 in the front-rear direction. Specifically, the response platform 30 and the shock platform 40 are arranged to be movable back and forth relative to the bearing tabletop 11. The shock cylinder 50 is used to drive the shock platform 40 to move forward, so that the shock platform 40 impacts the response platform 30 to generate a horizontal shock. The return cylinder 60 is used to drive the shock platform 40 to return. There are two shock cylinders 50, and these two shock cylinders 50 are arranged side by side and spaced apart in the left-right direction. The ends of the cylinder rods 51 of these two shock cylinders 50 are connected to the same shock plate 52. The shock plate 52 extends vertically in the left-right direction and is located behind the shock platform 40. The shock cylinder 50 drives the shock platform 40 to move forward by driving the shock plate 52 to move forward. The shock cylinder 50 is not in direct contact with the shock platform 40. After the impulse transfer is completed, the cylinder rod 51 and the shock plate 52 of the shock cylinder 50 will not affect the movement of the shock platform 40, and the impulse transfer is more pure, and the test indicators will basically not deviate. The return cylinder 60 is arranged between these two shock cylinders 50. The cylinder rod 61 of the return cylinder 60 penetrates the shock plate 52 and is connected to the rear end of the shock platform 40. This penetration means that a through hole coaxial with the cylinder rod 61 is opened on the shock plate 52, and the diameter of this through hole is larger than the outer diameter of the cylinder rod 61. When the cylinder rod 61 moves back and forth in this through hole, it will not contact the hole wall of this through hole; the return cylinder 60 includes a cylinder barrel 62 extending horizontally in the front-rear direction, a front end cover 63 connected to the front end of the cylinder barrel 62, a rear end cover 64 connected to the rear end of the cylinder barrel 62, and a piston 65 slidably arranged in the cylinder barrel 62 to divide the inner cavity of the cylinder barrel 62 into a front chamber 621 and a rear chamber 622. The front end of the piston 65 is connected to the end (rear end) of the cylinder rod 61 of the return cylinder 60 away from the shock platform 40. An air inlet channel for the front chamber 621 to intake air and an exhaust channel for the front chamber 621 to exhaust air are provided in the front end cover 63. The air inlet channel and the exhaust channel are alternately opened and closed. A constant ventilation channel 641 for the front and rear chambers 622 to intake and exhaust air is provided in the rear end cover 64. The constant ventilation channel 641 is communicated with the outside atmosphere. The diameter of the constant ventilation channel 641 is greater than or equal to the diameter of the exhaust channel. The diameter of the exhaust channel is greater than or equal to twice the diameter of the air inlet channel. Specifically, the diameter of the constant ventilation channel 641 is 8 mm, the diameter of the exhaust channel is also 8 mm, and the diameter of the air inlet channel is 4 mm. The above diameters refer to the diameters of the narrowest parts of the air channels.

[0035] The advantages of such a setting are as follows: it can not only drive the impact platform to return to its position by introducing air through the intake air passage, but also achieve a relatively high intake and exhaust speed by taking advantage of the large diameters of the exhaust air passage and the constant ventilation passage, avoiding interference with the impact action. The accuracy and reproducibility of the test results of this horizontal impact response spectrum test bench are better. At the same time, since the intake air passage and the exhaust air passage are alternately opened and closed, it can well match the impact action of the impact cylinder. Since the return cylinder is arranged between the two impact cylinders, it is convenient for installation and maintenance, and there is no need to open a window on the test bench surface, which does not affect the strength of the test bench base.

[0036] In this embodiment, for the convenience of connection, an annular groove 611 is provided at the end of the cylinder rod 61 of the return cylinder 60. The rear end of the impact platform 40 is connected with a fixture block 41 that matches the annular groove 611. A part of the fixture block 41 extends into the annular groove 611, so that the cylinder rod 61 of the return cylinder 60 is connected to the impact platform 40.

[0037] To achieve the alternating on-off of the intake air passage and the exhaust air passage, in this embodiment, a control valve 633 for controlling the alternating on-off of the intake air passage and the exhaust air passage is further provided on the front end cover 63. The control valve 633 includes a valve body 6331, a valve cavity provided in the valve body, and a valve core. The valve cavity extends in the front-rear direction and is connected in series to the intake air passage and the exhaust air passage. Specifically, the valve cavity includes a first valve cavity 6332 and a second valve cavity 6333. The axis lines of the first valve cavity 6332 and the second valve cavity 6333 are symmetrically distributed on both sides of the axis line of the cylinder barrel 62. The first valve cavity 6332 is connected in series to the intake air passage and divides the intake air passage into a first intake air passage 6311 and a second intake air passage 6312 that are perpendicular to each other. The second valve cavity 6333 is connected in series to the exhaust air passage and divides the exhaust air passage into a first exhaust air passage 6321 and a second exhaust air passage 6322 that are perpendicular to each other; the valve core is slidably disposed in the valve cavity. Specifically, the valve core includes a first valve core 6334 disposed in the first valve cavity 6332 and a second valve core 6335 disposed in the second valve cavity 6333. The first valve core 6334 is provided with a connecting air passage that matches the intake air passage. The connecting air passage includes a first connecting air passage 6336 and a second connecting air passage 6337 that are vertically connected; further, the first intake air passage 6311 extends horizontally in the front-rear direction. The rear end of the first intake air passage 6331 penetrates the rear side wall of the front end cover 63 backward and communicates with the front chamber 621. The front end of the first intake air passage 6311 penetrates the bottom wall of the first valve cavity 6332 forward. The second intake air passage 6312 extends vertically in the up-down direction. The upper end of the second intake air passage 6312 penetrates the side wall of the front end cover 63 upward to form an air inlet 635. The lower end of the second intake air passage 6312 penetrates the side wall of the first valve cavity 6332 downward; the first exhaust air passage 6321 extends vertically in the front-rear direction. The rear end of the first exhaust air passage 6321 penetrates the rear side wall of the front end cover 63 backward and communicates with the front chamber 621. The front end of the first exhaust air passage 6321 penetrates the bottom wall of the second valve cavity 6333 forward. The second exhaust air passage 6322 extends vertically in the up-down direction. The upper end of the second exhaust air passage 6322 penetrates the side wall of the second valve cavity 6333 upward. The lower end of the second exhaust air passage 6322 penetrates the side wall of the front end cover 63 downward to form an exhaust port 636; the first connecting air passage 6336 extends horizontally in the front-rear direction. The front end of the first connecting air passage 6336 is vertically connected to the second connecting air passage 6337. The rear end of the first connecting air passage 6336 penetrates the rear end face of the first valve core 6334. The second connecting air passage 6337 extends vertically in the up-down direction. The middle of the second connecting air passage 6337 is vertically connected to the first connecting air passage 6336. The end of the second connecting air passage 6337 penetrates the side wall of the first valve core 6334 and is connected to an annular air passage opened on the side wall of the first valve core 6334; the air inlet 635 is located in front of the exhaust port 636, and the exhaust port 636 communicates with the outside atmosphere;When the first spool 6334 moves forward to the limit position (the first working position), the annular air passage is offset from the opening of the second intake air passage 6312 on the side wall of the first valve chamber 6332, and the outer wall of the first spool 6334 blocks the opening of the second intake air passage 6312 on the side wall of the first valve chamber 6332, disconnecting the intake air passage. When the first spool 6334 moves backward to the limit position (the second working position), the annular air passage is aligned with the opening of the second intake air passage 6312 on the side wall of the first valve chamber 6332. The first intake air passage 6311 is communicated with the second intake air passage 6312 through the first connecting air passage 6336, the second connecting air passage 6337, and the annular air passage, enabling the intake air passage to be connected through the connecting air passage. When the second spool 6335 moves forward to the limit position (the first working position), the opening of the first exhaust air passage 6321 on the bottom wall of the second valve chamber 6333 and the opening of the second exhaust air passage 6322 on the side wall of the second valve chamber 6333 are both exposed, and the second spool 6335 is located in front of these two openings. The first exhaust air passage 6321 is communicated with the second exhaust air passage 6322 through the second valve chamber 6333, connecting the exhaust air passage. When the second spool 6335 moves backward to the limit position (the second working position), the second spool 6335 blocks the opening of the first exhaust air passage 6321 on the bottom wall of the second valve chamber 6333 and the opening of the second exhaust air passage 6322 on the side wall of the second valve chamber 6333, disconnecting the exhaust air passage.

[0038] In this embodiment, the actions of the first spool 6334 and the second spool 6335 moving backward to the limit position are synchronized to achieve the alternating connection and disconnection of the intake air passage and the exhaust air passage. To achieve this effect, preferably, a drive assembly 634 for driving the first spool 6334 and the second spool 6335 to move backward synchronously is further provided on the front end cover 63. The drive assembly 634 includes a valve cover plate 6341 connected to the front end face of the valve body 6331, a drive air passage 6342 provided in the valve cover plate 6341 for supplying air to and exhausting air from the first valve chamber 6332 and the second valve chamber 6333, and an annular air groove 6343 provided on the rear end face of the valve cover plate 6341. The drive air passage 6342 is synchronously connected to the first valve chamber 6332 and the second valve chamber 6333 through the annular air groove 6343.

[0039] When compressed air is introduced into the drive air passage 6342 and the first intake air passage 6311, and when the impact action of the impact cylinder 50 ends, the first spool 6334 and the second spool 6335 move backward to the limit position, the intake air passage is connected, and the exhaust air passage is disconnected. The front chamber 621 of the cylinder block 61 intakes air, pushing the piston 65 to move backward, driving the cylinder rod 61 of the return cylinder 60 and the impact platform 40 to move backward to achieve the return. During the return process, the impact platform 40 touches the impact plate 52 and drives the impact plate 52 to move backward, causing the impact cylinder 50 to return.

[0040] To achieve the automatic reset of the first spool 6334, in this embodiment, a spring 6338 for driving the first spool 6334 to move forward to the extreme position is further provided in the first valve chamber 6332, and an annular spring groove 6339 for accommodating the front end portion of the spring 6338 is provided on the rear end face of the first spool 6334.

[0041] After the return cylinder 60 drives the impact platform 40 and the impact cylinder 50 to return, the compressed air in the drive air passage 6342 is released. The first spool 6334 moves forward to the extreme position under the action of the spring 6338 and the air pressure in the front chamber 621, disconnecting the intake air passage. After it moves to the extreme position, the second spool 6335 moves forward to the extreme position under the action of the air pressure in the front chamber 621, connecting the exhaust air passage, and releasing the compressed air in the front chamber 621 to the outside atmosphere through the exhaust air passage.

[0042] Due to the presence of the spring 6338, there is a time difference when the first spool 6334 and the second spool 6335 move forward to the extreme position, so that the first intake air passage 6311 can be kept in the state of introducing compressed air without wasting compressed air. To facilitate the impact operation, in the present invention, the air inlet 635 is communicated with a constant pressure air source.

[0043] To achieve the reset of the response platform 30, in this embodiment, the horizontal shock response spectrum test bench further includes a reset cylinder 70 for driving the response platform 30 to reset. The reset cylinder 70 is arranged on the test bench base 10 and is located on the left and right sides of the response platform 30.

[0044] The above embodiments are only used to illustrate the technical concept and features of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly. It cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A return cylinder for a horizontal shock response spectrum test bench, which is used to drive the shock platform of the horizontal shock response spectrum test bench to return. The return cylinder includes: A cylinder barrel; A front end cover connected to the front end of the cylinder barrel; A rear end cover connected to the rear end of the cylinder barrel; A piston slidably arranged in the cylinder barrel to divide the inner cavity of the cylinder barrel into a front cavity and a rear cavity; A cylinder rod passing through the impact plate and connected to the rear end of the shock platform. The end of the cylinder rod away from the shock platform is connected to the piston; It is characterized in that: An air inlet airway for the front cavity to intake air and an air exhaust airway for the front cavity to exhaust air are provided in the front end cover. The air inlet airway and the air exhaust airway are alternately opened and closed. A constant air passage for the front and rear cavities to intake and exhaust air is provided in the rear end cover. The constant air passage is communicated with the outside atmosphere. The diameter of the constant air passage is greater than or equal to the diameter of the air exhaust airway. The diameter of the air exhaust airway is greater than or equal to twice the diameter of the air inlet airway.

2. The return cylinder for the horizontal shock response spectrum test bench according to claim 1, characterized in that: An annular groove is provided at the end of the cylinder rod. A clamping block matching the annular groove is connected to the rear end of the shock platform. A part of the clamping block extends into the annular groove.

3. The return cylinder for the horizontal shock response spectrum test bench according to claim 1, wherein: A control valve for controlling the alternate opening and closing of the air inlet airway and the air exhaust airway is further provided on the front end cover. The control valve includes a valve body, a valve cavity provided in the valve body, and a valve core. The valve cavity extends in the front-rear direction. The valve cavity is connected in series to the air inlet airway and the air exhaust airway. The valve core is slidably arranged in the valve cavity in the front-rear direction. A connecting airway matching the air inlet airway is provided on the valve core. When the valve core moves backward to the limit position, the air inlet airway is connected through the connecting airway and the air exhaust airway is disconnected. When the valve core moves forward to the limit position, the air inlet airway is disconnected and the air exhaust airway is connected.

4. The return cylinder for the horizontal shock response spectrum test bench according to claim 3, characterized in that: The valve cavity includes a first valve cavity and a second valve cavity. The axis lines of the first valve cavity and the second valve cavity are symmetrically distributed on both sides of the axis line of the cylinder barrel. The first valve cavity is connected in series to the air inlet airway. The second valve cavity is connected in series to the air exhaust airway. The valve core includes a first valve core arranged in the first valve cavity and a second valve core arranged in the second valve cavity. The connecting airway is arranged on the first valve core.

5. The return cylinder for the horizontal shock response spectrum test bench according to claim 4, characterized in that: A spring for driving the first valve core to move forward is further provided in the first valve cavity. An annular spring groove for accommodating the front end of the spring is provided on the rear end face of the first valve core.

6. The return cylinder for the horizontal shock response spectrum test bench according to claim 4, characterized in that: The actions of the first valve core and the second valve core moving backward to the limit position are synchronized to realize the alternate opening and closing of the air inlet airway and the air exhaust airway.

7. The return cylinder for the horizontal shock response spectrum test bench according to claim 6, characterized in that: A driving component for driving the first valve core and the second valve core to move backward synchronously is further provided on the front end cover. The driving component includes a valve cover plate connected to the front end face of the valve body and a driving airway provided in the valve cover plate for intake and exhaust air to the first valve cavity and the second valve cavity.

8. The return cylinder for the horizontal shock response spectrum test bench according to claim 7, characterized in that: An annular air groove is provided on the rear end face of the valve cover plate. The driving airway is synchronously connected to the first valve cavity and the second valve cavity through the annular air groove.

9. The return cylinder for the horizontal shock response spectrum test bench according to claim 1, characterized in that: The impact plate is used to drive the impact platform to move forward. The ends of the cylinder rods of two impact cylinders arranged side by side and spaced apart in the left-right direction are connected to the impact plate, and the return cylinder is arranged between the two impact cylinders.

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