Horizontal double-wave impact table

Abstract

The horizontal double-wave impact table comprises a base, a response platform, an impact platform and a driving mechanism, a sliding rail and a fixing seat are arranged on the base, the response platform and the impact platform are erected on the sliding rail in a sliding mode, the driving mechanism comprises a return air cylinder and an impact air cylinder, and the return air cylinder is arranged behind the impact platform. The two return air cylinders are arranged on the left side and the right side respectively, the ends of air cylinder rods of the return air cylinders are connected with the impact platform, and when the return air cylinders act, the impact platform can be pulled back backwards to a set position; the impact cylinders are arranged between the two return cylinders, the multiple impact cylinders are arranged side by side in the left-right direction, the ends of cylinder rods of all the impact cylinders are connected to the same impact plate, and when the impact cylinders act, the impact plate can move forwards to impact the impact platform, so that the impact platform rapidly moves and impacts the response platform for testing; the return air cylinder is convenient to disassemble and assemble, when impact force is increased, the impact air cylinder is not prone to damage, the cylinder diameter requirement is relatively small, and the equipment size is small.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of impact test equipment, and particularly relates to a horizontal double-wave impact platform. BACKGROUND

[0002] The horizontal impact test is a test method for determining the safety, reliability and effectiveness of a product when subjected to horizontal impact, and needs to rely on a special device for testing, such as a horizontal impact response spectrum measuring device disclosed in Chinese patent CN106525373A, but the scheme at least has the following problems:

[0003] 1. The reset air cylinder of the impact platform is arranged in the base, and interference with the gas supply tank is prone to occur during layout, and the reset air cylinder is inconvenient to disassemble and assemble.

[0004] 2. Only a single impact air cylinder is provided, the air cylinder rod seal is prone to wear during a large impact force test, and the air cylinder rod is prone to swing after wear, thereby affecting the test accuracy, and a larger cylinder diameter is needed for the large impact force test, thereby greatly increasing the volume of the device.

[0005] 3. No specific device is provided to limit the position of the response platform, and the response platform is prone to secondary impact with the impact platform due to rebound after being impacted. CONTENT OF THE UTILITY MODEL

[0006] The utility model aims at overcoming one or more defects in the prior art, and provides a horizontal double-wave impact platform.

[0007] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of a horizontal double-wave impact platform, which comprises:

[0008] A base, the upper surface of the base is provided with a sliding rail extending in the front-rear direction, the front end of the base is connected with a fixed seat, and the fixed seat extends across the front of the sliding rail;

[0009] A response platform, the response platform is used for placing a product to be detected, and the response platform is slidably arranged on the sliding rail;

[0010] An impact platform, the impact platform is slidably arranged on the sliding rail and located at the rear of the response platform;

[0011] A driving mechanism, the driving mechanism comprises a reset air cylinder and an impact air cylinder;

[0012] The reset air cylinder is arranged at the rear of the impact platform and fixed to the upper surface of the base, the reset air cylinder has two air cylinder rods arranged on the left and right sides of the upper surface of the base, the end of the air cylinder rod of the reset air cylinder is connected with the impact platform, and the reset air cylinder can pull the impact platform back to a set position when the reset air cylinder is actuated;

[0013] The impact cylinders are arranged between the two reset cylinders, and a plurality of the impact cylinders are arranged side by side along the left-right direction on the upper surface of the base, and the cylinder rod ends of all the impact cylinders are connected to the same impact plate, which moves forward to impact the impact platform when the impact cylinders are actuated, so that the impact platform moves rapidly and impacts the response platform.

[0014] Preferably, the axial lines of the two reset cylinders and the axial lines of the plurality of impact cylinders are located in the same plane.

[0015] Preferably, the driving mechanism further comprises a limiting cylinder for limiting the position of the response platform, which is arranged on the upper surface of the base and below the impact platform, and the cylinder rod end of the limiting cylinder extends forward and is aligned with the response platform to limit the retreat distance of the response platform after impacting the fixed seat.

[0016] Preferably, the front end face of the impact platform, the front end face and the rear end face of the response platform, and the rear end face of the fixed seat are all provided with a half-sine wave generator, which is in the shape of a round cake.

[0017] Further preferably, the half-sine wave generators on any end face are a plurality of and are arranged at intervals along the left-right direction, and the half-sine wave generators on the facing side end faces are correspondingly arranged.

[0018] Preferably, the reset cylinder comprises a first cylinder barrel, a first piston, a first cylinder rod, a first front end cover, and a first rear end cover, the rear end of the first cylinder rod is connected to the first piston, the front end of the first cylinder rod penetrates through the first front end cover and is connected to the response platform, the first front end cover is provided with alternating intake and exhaust air passages, the intake and exhaust air passages are in the shape of L, and the first rear end cover is provided with a first always-open air passage which is connected to the outside.

[0019] Further preferably, the first front end cover is provided with a valve body and a valve cover plate, the valve body is provided with a valve cavity and a valve core, the valve cavity extends along the front-rear direction and penetrates through the valve body, the valve cavity includes an intake valve cavity connected in series with the intake air passage and an exhaust valve cavity connected in series with the exhaust air passage, the valve core includes an intake valve core slidably arranged in the intake valve cavity and an exhaust valve core slidably arranged in the exhaust valve cavity, the intake valve core is provided with a connecting air passage, when the intake valve core and the exhaust valve core move forward to the limit position, the intake air passage is disconnected and the exhaust air passage is connected, when the intake valve core and the exhaust valve core move backward to the limit position, the intake air passage is connected through the connecting air passage and the exhaust air passage is disconnected, the intake valve cavity is provided with a first spring for driving the intake valve core to move forward, the rear end surface of the valve cover plate is provided with a first annular air groove in communication with the intake valve cavity and the exhaust valve cavity, and the valve cover plate is further provided with a driving air passage for connecting the first annular air groove with the external air pipe.

[0020] Preferably, the impact air cylinder includes a second cylinder barrel, a second piston, a second cylinder rod, a second front end cover and a second rear end cover, the rear end of the second cylinder rod is connected with the second piston, the front end of the second cylinder rod penetrates through the second front end cover and is connected with the impact plate, the second front end cover is provided with a second always-open air passage in communication with the outside, the second rear end cover includes a body, a center valve sleeve and a center valve core, the body is connected with the rear end of the second cylinder barrel, the body is provided with a hollow cavity in communication with the inner cavity of the second cylinder barrel, the outer wall of the body is provided with an air inlet hole in communication with the hollow cavity, the center valve sleeve is inserted into the hollow cavity, the outer wall of the center valve sleeve is sealingly connected with the inner wall of the hollow cavity, the outer wall of the center valve sleeve is provided with a second annular groove, the bottom wall of the second annular groove is provided with a through hole penetrating through the center valve sleeve along the radial direction, the air inlet hole is in communication with the inner cavity of the second cylinder barrel through the second annular groove and the through hole, and the center valve core is slidably arranged in the center valve sleeve, when the center valve core moves forward to the limit position, the through hole is closed, and when the center valve core moves backward to the limit position, the through hole is opened.

[0021] Further preferably, the front end face of the center valve core is provided with a rearwardly extending center blind hole, the rear end portion of the center valve core is provided with a circumferential air hole in communication with the center blind hole, the center valve sleeve is provided with a communication hole in communication with the outside on the outer wall of the body rear end, when the center valve core moves forward to the limit position, the circumferential air hole is aligned and communicated with the communication hole, when the center valve core moves rearward to the limit position, the circumferential air hole is staggered and disconnected with the communication hole, a second spring is arranged between the center valve core and the center valve sleeve, the two ends of the second spring are respectively abutted on the outer annular flange on the outer wall of the center valve core and the inner annular flange on the inner wall of the center valve sleeve, the second spring has a tendency to drive the center valve core to move rearward, and a sealing plate is connected at the rear end opening of the center valve sleeve, the sealing plate is provided with a control air hole in communication with the inner cavity of the center valve sleeve.

[0022] Preferably, the slide rails are three and are arranged in the left-right direction at intervals, and the return air cylinders and the limiting air cylinders are arranged between two adjacent slide rails.

[0023] Thanks to the technical scheme, the utility model has the following advantages compared with the prior art:

[0024] The horizontal double-wave impact platform comprises a base, a response platform, an impact platform and a driving mechanism, the base is provided with slide rails and fixing seats, the response platform and the impact platform are slidably arranged on the slide rails, the driving mechanism comprises return air cylinders and impact air cylinders, the return air cylinders are arranged behind the impact platform, the return air cylinders are arranged on the left and right sides, the cylinder rod ends of the return air cylinders are connected with the impact platform, and the impact platform can be pulled back to a set position when the return air cylinders act. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a top view of the preferred embodiment of the utility model, and a part is cut away.

[0026] Figure 2 is Figure 1 a front view of the preferred embodiment of the utility model, and a part is cut away.

[0027] Figure 3 is Figure 1Enlarged view of the return cylinder, the view angle is adjusted for easy observation.

[0028] Figure 4 is Figure 3 Enlarged view of part A in the middle.

[0029] Figure 5 is Figure 1 Enlarged view of the impact cylinder, the view angle is adjusted for easy observation.

[0030] Figure 6 is Figure 5 Enlarged view of part B in the middle.

[0031] Wherein: 10. base; 11. slide rail; 12. fixed seat; 20. response platform; 30. impact platform; 41. return cylinder; 411. first cylinder barrel; 412. first piston; 413. first cylinder rod; 414. first front end cover; 4141. air inlet air duct; 4142. exhaust air duct; 4143. valve body; 4144. air inlet valve cavity; 4145. exhaust valve cavity; 4146. air inlet valve core; 4147. exhaust valve core; 4148. connecting air duct; 4149. first spring; 415. first rear end cover; 4151. first always-through air duct; 416. valve cover plate; 4161. first annular air groove; 4162. driving air duct; 42. impact cylinder; 421. second cylinder barrel; 422. second piston; 423. second cylinder rod; 424. second front end cover; 4241. second always-through air duct; 425. second rear end cover; 4251. body; 4252. center valve sleeve; 4253. center valve core; 4254. second annular air groove; 4255. through hole; 4256. center blind hole; 4257. circumferential air hole; 4258. communication hole; 4259. second spring; 4260. outer annular flange; 4261. inner annular flange; 4262. sealing plate; 4263. control air hole; 427. air inlet hole; 43. limiting cylinder; 44. impact plate; 50. half-sine wave generator. DETAILED DESCRIPTION

[0032] The front-rear direction described in the utility model is Figure 1 The up-down direction in the utility model.

[0033] As Figures 1 to 6The utility model provides a horizontal double wave impact platform, which comprises a base 10, a response platform 20, an impact platform 30 and a driving mechanism, wherein the upper surface of the base 10 is provided with sliding rails 11 extending in the front-rear direction, the sliding rails 11 are three in number and are arranged in parallel and at intervals in the left-right direction, the front end of the base 10 is connected with a fixing seat 12, the upper end of the fixing seat 12 protrudes upward and extends across the front of the sliding rails 11, the response platform 20 is used for placing products to be detected, and the response platform 20 is slidably arranged on the sliding rails 11, the impact platform 30 is slidably arranged on the sliding rails 11 and located at the rear of the response platform 20, and the driving mechanism comprises a return air cylinder 41, an impact air cylinder 42 and a limiting air cylinder 43, the return air cylinder 41 is used for pulling the response platform 20 backward to reset it, the impact air cylinder 42 is used for driving the impact platform 30 to move forward to impact the response platform 20, thereby generating an impact, and the limiting air cylinder 43 is used for limiting the position of the response platform 20, specifically, the return air cylinder 41 is arranged at the rear of the impact platform 30 and fixed to the upper surface of the base 10, the return air cylinder 41 is two in number and arranged on the left and right sides of the upper surface of the base 10, the return air cylinder 41 is arranged between two adjacent sliding rails 11, the cylinder rod end of the return air cylinder 41 is connected with the impact platform 30, and when the return air cylinder 41 acts, the impact platform 30 can be pulled backward to a set position, the impact air cylinder 42 is arranged between the two return air cylinders 41, the impact air cylinder 42 is three in number, the three impact air cylinders 42 are arranged in parallel on the upper surface of the base 10 in the left-right direction, the cylinder rod ends of all the impact air cylinders 42 are connected to the same impact plate 44, when the impact air cylinder 42 acts, the impact plate 44 moves forward to impact the impact platform 30, so that the impact platform 30 moves quickly and impacts the response platform 20, the limiting air cylinder 43 is arranged on the upper surface of the base 10 and located below the impact platform 30, the cylinder rod end of the limiting air cylinder 43 protrudes forward and is aligned with the response platform 20, so as to limit the retreat distance of the response platform 20 after impacting the fixing seat 12.

[0034] The advantages of such an arrangement are as follows:

[0035] 1. The return air cylinder can be conveniently arranged and disassembled, and when it is necessary to change the type of impact test, such as changing from bidirectional impact or impact response spectrum to simple horizontal impact test, only the return air cylinder and the impact platform need to be disassembled, or only the return air cylinder needs to be disassembled, and then the impact plate can be connected to the impact platform, which is convenient to operate.

[0036] 2. When a large impact force test is performed, the cylinder rod seal of the impact air cylinder is not easy to damage, and the impact force is evenly distributed among the three impact air cylinders, so the cylinder diameter required is relatively small, and the overall size of the equipment is relatively small.

[0037] 3. The limiting air cylinder can also limit the position of the response platform, so that the response platform does not rebound too far after impacting the fixing seat and then collide with the impact platform again.

[0038] In the embodiment, the shaft center lines of the two return air cylinders 41 and the three impact air cylinders 42 are located on the same horizontal plane, the shaft center line of the limiting air cylinder 43 is located below the plane, specifically, the limiting air cylinder 43 is lower than the air cylinder rods of the return air cylinders 41 and the impact air cylinders 42 to avoid interference, and the limiting air cylinder 43 is two, which is arranged between the two adjacent slide rails 11.

[0039] In the embodiment, the front end face of the impact platform 30, the front end face and the rear end face of the response platform 20, and the rear end face of the fixed seat 12 are all provided with a half-sine wave generator 50, which is in the shape of a round cake, and there are four half-sine wave generators 50 on each end face and they are arranged in the left-right direction, and the half-sine wave generators 50 on the opposite side end faces are arranged one by one.

[0040] In the embodiment, the return air cylinder 41 includes a first cylinder barrel 411, a first piston 412, a first air cylinder rod 413, a first front end cover 414, and a first rear end cover 415, the rear end of the first air cylinder rod 413 is connected to the first piston 412, the front end of the first air cylinder rod 413 penetrates through the first front end cover 414 and is connected to the response platform 20, the first front end cover 414 is internally provided with an alternating on-off air inlet channel 4141 and an air outlet channel 4142, the air inlet channel 4141 and the air outlet channel 4142 are in the shape of L and are connected to the air pipe outside, and the first rear end cover 415 is internally provided with a first always-open air channel 4151 connected to the atmosphere outside.

[0041] Further, the first front end cover 414 is provided with a valve body 4143 and a valve cover plate 416, the valve body 4143 is internally provided with a valve cavity and a valve core, the valve cavity extends in the front-rear direction and penetrates through the valve body 4141, the valve cavity includes an air inlet valve cavity 4144 connected in series to the air inlet channel 4141 and an air outlet valve cavity 4145 connected in series to the air outlet channel 4142, the valve core includes an air inlet valve core 4146 slidably arranged in the air inlet valve cavity 4144 and an air outlet valve core 4147 slidably arranged in the air outlet valve cavity 4145, the air inlet valve core 4146 is provided with a connecting air channel 4148, when the air inlet valve core 4146 and the air outlet valve core 4147 move forward to the limit position, the air inlet channel 4141 is disconnected and the air outlet channel 4142 is connected, when the air inlet valve core 4146 and the air outlet valve core 4147 move backward to the limit position, the air inlet channel 4141 is connected through the connecting air channel 4148 and the air outlet channel 4142 is disconnected, the air inlet valve cavity 4144 is internally provided with a first spring 4149 for driving the air inlet valve core 4146 to move forward, the rear end face of the valve cover plate 416 is provided with a first annular air groove 4161 connected to the air inlet valve cavity 4145 and the air outlet valve cavity 4146, and the valve cover plate 416 is further internally provided with a driving air channel 4162 for connecting the first annular air groove 4161 and the air pipe outside.

[0042] In the embodiment, the impact cylinder 42 comprises a second cylinder barrel 421, a second piston 422, a second cylinder rod 423, a second front end cover 424, and a second rear end cover 425. The rear end of the second cylinder rod 423 is connected to the second piston 422, and the front end of the second cylinder rod 423 penetrates through the second front end cover 424 and is connected to the impact plate 44. The second front end cover 424 is provided with a second always-open air passage 4241 which is in communication with the outside atmosphere. The second rear end cover 425 comprises a body 4251, a center valve sleeve 4252, and a center valve core 4253. The body 4251 is connected to the rear end of the second cylinder barrel 421. A hollow cavity is arranged in the body 4251 and is in communication with the inner cavity of the second cylinder barrel 421. An air inlet hole 427 is formed in the outer wall of the body 4251 and is in communication with the hollow cavity. The air inlet hole 427 is also in communication with a gas storage tank arranged in the base 10. The center valve sleeve 4252 is inserted into the hollow cavity, and the outer wall of the center valve sleeve 4252 is sealingly connected to the inner wall of the hollow cavity. A second annular groove 4254 is formed in the outer wall of the center valve sleeve 4252. The bottom wall of the second annular groove 4254 is provided with a through hole 4255 which penetrates through the center valve sleeve 4252 in the radial direction. The air inlet hole 4211 is in communication with the inner cavity of the second cylinder barrel 421 through the second annular groove 4254 and the through hole 4255. The center valve core 4253 is slidingly arranged in the center valve sleeve 4252. When the center valve core 4253 moves forward to the limit position, the outer wall of the center valve core 4253 blocks the inner opening of the through hole 4255, so that the through hole 4255 is closed. When the center valve core 4253 moves backward to the limit position, the outer wall of the center valve core 4253 is separated from the inner opening of the through hole 4255, so that the through hole 4255 is opened.

[0043] Further, the front end surface of the center valve core 4253 is provided with a rearwardly extending center blind hole 4256. The rear end of the center valve core 4253 is provided with a circumferential air hole 4257 which is in communication with the center blind hole 4256. A communication hole 4258 which is in communication with the outside is formed in the outer wall of the body rear end of the center valve sleeve 4252. When the center valve core 4253 moves forward to the limit position, the circumferential air hole 4257 is aligned with and communicates with the communication hole 4258. When the center valve core 4253 moves backward to the limit position, the circumferential air hole 4257 is misaligned with and disconnected from the communication hole 4258. A second spring 4259 is arranged between the center valve core 4253 and the center valve sleeve 4252. The second spring 4259 is located between the through hole 4255 and the communication hole 4258. The two ends of the second spring 4259 are respectively abutted against an outer annular flange 4260 on the outer wall of the center valve core 4253 and an inner annular flange 4261 on the inner wall of the center valve sleeve 4252. The second spring 4259 has a tendency to drive the center valve core 4253 to move backward. The rear end opening of the center valve sleeve 4252 is connected to a sealing plate 4262. The sealing plate 4262 is provided with a control air hole 4263 which is in communication with the inner cavity of the center valve sleeve 4252.

[0044] In the embodiment, the specific structure of the limit cylinder 43 is the same as that of a common cylinder, and thus is not described herein.

[0045] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A horizontal double-wave impact platform, comprising: a base, an upper surface of the base being provided with a slide rail extending in a front-rear direction, a front end of the base being connected with a fixing seat, the fixing seat being transverse to a front of the slide rail; a response platform, the response platform being used for placing products to be detected, the response platform being slidably arranged on the slide rail; an impact platform, the impact platform being slidably arranged on the slide rail and located at a rear of the response platform; a driving mechanism, the driving mechanism comprising a return cylinder and an impact cylinder; characterized in that: the return cylinder is arranged at a rear of the impact platform and fixed on the upper surface of the base, the return cylinder has two and is arranged on left and right sides of the upper surface of the base, an end of a cylinder rod of the return cylinder is connected with the impact platform, and the return cylinder can pull the impact platform back to a set position when the return cylinder is actuated; the impact cylinder is arranged between the two return cylinders, the impact cylinder has a plurality of and is arranged side by side on the upper surface of the base in a left-right direction, end of cylinder rods of all the impact cylinders is connected on a same impact plate, and the impact plate moves forward to impact the impact platform when the impact cylinder is actuated, so that the impact platform moves rapidly and impacts the response platform.

2. The horizontal dual wave impact table of claim 1, wherein: axial lines of the two return cylinders and axial lines of the plurality of impact cylinders are located on a same plane.

3. The horizontal dual wave impact table of claim 1, wherein: the driving mechanism further comprises a limiting cylinder for limiting a position of the response platform, the limiting cylinder is arranged on the upper surface of the base and located below the impact platform, an end of a cylinder rod of the limiting cylinder extends forward and is aligned with the response platform to limit a retreat distance of the response platform after the response platform impacts the fixing seat.

4. The horizontal dual wave impact table of claim 1, wherein: an end face of the impact platform, an end face of the response platform and a rear end face of the fixing seat are all provided with a half-sine wave generator, the half-sine wave generator is in a form of a round cake.

5. The horizontal dual wave impact table of claim 4, wherein: the half-sine wave generators on any end face are a plurality of and are arranged in intervals in a left-right direction, the half-sine wave generators on opposite end faces are correspondingly arranged.

6. The horizontal dual wave impact table of claim 1, wherein: the return cylinder comprises a first cylinder barrel, a first piston, a first cylinder rod, a first front end cover and a first rear end cover, a rear end of the first cylinder rod is connected with the first piston, a front end of the first cylinder rod penetrates through the first front end cover and connected with the response platform, the first front end cover is internally provided with an alternating intake air passage and exhaust air passage, the intake air passage and the exhaust air passage are in an L shape, and the first rear end cover is internally provided with a first always-open air passage which is communicated with an outside.

7. The horizontal dual wave impact table of claim 6, wherein: The first front end cover is provided with a valve body and a valve cover plate, the valve body is provided with a valve cavity and a valve core, the valve cavity extends along the front and back directions and penetrates the valve body, the valve cavity includes an intake valve cavity connected in series on the intake air duct and an exhaust valve cavity connected in series on the exhaust air duct, the valve core includes an intake valve core slidably arranged in the intake valve cavity and an exhaust valve core slidably arranged in the exhaust valve cavity, the intake valve core is provided with a connecting air duct, when the intake valve core and the exhaust valve core move forward to the limit position, the intake air duct is disconnected and the exhaust air duct is connected, when the intake valve core and the exhaust valve core move backward to the limit position, the intake air duct is connected through the connecting air duct and the exhaust air duct is disconnected, the intake valve cavity is provided with a first spring for driving the intake valve core to move forward, the rear end surface of the valve cover plate is provided with a first annular air groove in communication with the intake valve cavity and the exhaust valve cavity, and the valve cover plate is further provided with a driving air duct for connecting the first annular air groove with an external air pipe.

8. The horizontal dual wave impact table of claim 1, wherein: The impact air cylinder includes a second cylinder barrel, a second piston, a second cylinder rod, a second front end cover and a second rear end cover, the rear end part of the second cylinder rod is connected to the second piston, the front end part of the second cylinder rod penetrates the second front end cover and is connected to the impact plate, the second front end cover is provided with a second always-open air duct in communication with the outside, the second rear end cover includes a body, a center valve sleeve and a center valve core, the body is connected to the rear end of the second cylinder barrel, the body is provided with a hollow cavity in communication with the inner cavity of the second cylinder barrel, the outer wall of the body is provided with an air inlet hole in communication with the hollow cavity, the center valve sleeve is inserted into the hollow cavity, the outer wall of the center valve sleeve is sealingly connected to the inner wall of the hollow cavity, the outer wall of the center valve sleeve is provided with a second annular groove, the bottom wall of the second annular groove is provided with a through hole penetrating the center valve sleeve along the radial direction, the air inlet hole is in communication with the inner cavity of the second cylinder barrel through the second annular groove and the through hole, and the center valve core is slidably arranged in the center valve sleeve, when the center valve core moves forward to the limit position, the through hole is closed, and when the center valve core moves backward to the limit position, the through hole is opened.

9. The horizontal dual wave impact table of claim 8, wherein: The front end face of the center valve core is provided with a rearward extending center blind hole, the rear end part of the center valve core is provided with a circumferential air hole communicated with the center blind hole, the center valve sleeve is provided with a communicating hole communicated with the outside on the outer wall of the body rear end, when the center valve core moves forward to the limit position, the circumferential air hole is aligned and communicated with the communicating hole, when the center valve core moves backward to the limit position, the circumferential air hole is staggered and disconnected with the communicating hole, the second spring is arranged between the through hole and the communicating hole, the two ends of the second spring are respectively abutted on the outer annular flange on the outer wall of the center valve core and the inner annular flange on the inner wall of the center valve sleeve, the second spring has a tendency to drive the center valve core to move backward, the rear end opening of the center valve sleeve is connected with a sealing plate, the sealing plate is provided with a control air hole communicated with the inner cavity of the center valve sleeve.

10. The horizontal dual wave impact table of claim 3, wherein: The slide rails are three and are arranged at intervals along the left-right direction, and the return air cylinder and the limiting air cylinder are arranged between two adjacent slide rails.

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