A catapult device

Abstract

The present invention relates to the field of impact and ejection test equipment, and specifically discloses an ejection device. The ejection device includes an ejection cylinder, a gas storage tank, and a gas supply member. The gas supply member is communicated with the gas storage tank. An ejection chamber is provided in the ejection cylinder, and a piston is slidably sealed in the ejection chamber. A piston rod is fixed on the piston. An air intake chamber is also provided in the ejection cylinder, and the air intake chamber is communicated with the gas storage tank. A communication port for communicating the ejection chamber with the air intake chamber is provided in the ejection cylinder; an opening valve core is provided in the air intake chamber, and the opening valve core is opposite to the communication port and is used for closing the communication port. The opening valve core is connected with a pushing member for pushing the opening valve core to slide. The ejection device in the present invention can provide a greater ejection speed without using a valve, so as to extend the service life of the ejection device.

Description

Technical Field

[0001] The present invention relates to the field of impact and ejection test equipment, and particularly to an ejection device. Background Art

[0002] When conducting impact and ejection tests, an ejection device is needed to push an object out. Compressed air is a commonly used power source for providing ejection power. During use, an air supply device such as an air compressor is connected to a cylinder, and the piston of the cylinder is driven to slide by the air supply device, thereby driving the piston rod to extend and ejecting the object. However, when the air supply device and other equipment provide limited compressed air to the cylinder per unit time, the speed at which the piston rod of the cylinder extends is limited, and it is difficult to meet the situation where a large ejection speed is required.

[0003] Later, an ejection device with an air storage tank appeared. The air storage tank is connected to both the cylinder and the air supply device, and a valve is provided between the air storage tank and the cylinder. Before the test, compressed air is first conveyed into the air storage tank through the air supply device to increase the pressure in the air storage tank. During the test, the valve is opened, and the compressed air in the air storage tank quickly enters the cylinder, causing the piston rod of the cylinder to quickly slide outwards.

[0004] Although the above ejection device can provide a greater ejection speed, because a large amount of compressed air needs to be introduced into the air storage tank, the pressure in the air storage tank is relatively high, and the valve is easily damaged under the action of the pressure. Summary of the Invention

[0005] The present invention aims to provide an ejection device that can provide a greater ejection speed without using a valve, so as to extend the service life of the ejection device.

[0006] To achieve the above object, the present invention adopts the following technical solution: An ejection device includes an ejection cylinder, an air storage tank, and an air supply member. The air supply member is connected to the air storage tank. An ejection chamber is provided in the ejection cylinder, and a piston is slidably sealed in the ejection chamber. A piston rod is fixed to the piston. An air intake chamber is also provided in the ejection cylinder, and the air intake chamber is connected to the air storage tank. A communication port for connecting the ejection chamber and the air intake chamber is provided in the ejection cylinder. An opening valve core is provided in the air intake chamber. The opening valve core faces the communication port and is used to close the communication port. The opening valve core is connected to a pushing member for pushing the opening valve core to slide.

[0007] The beneficial effects of this solution are:

[0008] 1. The opening valve core in this solution can seal the communication port, and the intake cavity is connected to the air storage tank. When the air supply component injects compressed air into the air storage tank, the air simultaneously enters the intake cavity, causing the pressure in the intake cavity and the air storage tank to increase synchronously. During the test, sliding the opening valve core to the side away from the communication port can connect the intake cavity and the ejection cavity through the communication port, and the compressed air in the intake cavity and the air storage tank quickly enters the ejection cavity, causing the piston rod of the ejection cylinder to quickly slide out. Compared with the current valves, when the opening valve core seals the communication port, it is less likely to be damaged under high pressure, extending the service life of the ejection device.

[0009] 2. In this solution, the opening valve core can be directly pushed to slide by the pushing component, making the sealing and opening of the communication port more convenient. Moreover, when the pressure is relatively high and it is necessary to improve the sealing effect of the communication port, the pressure between the opening valve core and the communication port can be increased by the pushing component, that is, the sealing effect can increase synchronously with the pressure, so as to meet the impact and ejection tests with different pressure requirements.

[0010] 3. When the diameter of the communication port is relatively large, the diameter of the opening valve core can be increased synchronously to seal the communication port, without considering whether the size of the communication port can match the specifications of the valve, making the assembly and production simpler.

[0011] Furthermore, a connection component is provided between the opening valve core and the pushing component. The connection component includes a cross joint A and a cross joint B. The cross joint A is connected to the pushing component. One end of the opening valve core away from the communication port is provided with a first guiding groove, and one end of the cross joint A close to the communication port is provided with a second guiding groove. The included angle between the projection of the first guiding groove along the axis of the cross joint B and the second guiding groove is less than or equal to 90°. Both ends of the cross joint B are fixed with guiding blocks, and the two guiding blocks are respectively located in the first guiding groove and the second guiding groove.

[0012] The beneficial effect of this solution is as follows: There are machining errors during the machining of threads. If the opening valve core and the pushing component are connected by threads, the coaxiality between the opening valve core and the pushing component will cause the uneven force of the compressed air and the pushing force of the pushing component on the opening valve core, resulting in deformation and inability to seal the communication port well. In this solution, the opening valve core is connected to the pushing component through the cross joint A and the cross joint B. During use, the first guiding groove and the second guiding groove position the cross joint B in the X-axis and Y-axis directions through the guiding blocks, ensuring good coaxiality between the opening valve core, the cross joint A and the pushing component, making the opening valve core receive uniform force and not deform under the action of pressure.

[0013] Further, the two guiding blocks are respectively in sliding fit with the first guiding groove and the second guiding groove, and the width of the guiding block at the end away from the cross joint B is greater than that at the end close to the cross joint B. After installation, when subjected to an axial tensile force, the guiding block in this solution will not be disengaged from the first guiding groove and the second guiding groove, ensuring that the pusher can drive the opening valve core to slide.

[0014] The beneficial effect of this solution is that during installation, by sliding the guiding block along the first guiding groove and the second guiding groove, the opening valve core, the cross joint B, and the cross joint A can be quickly connected in sequence.

[0015] Further, the cross-section of the guiding block is T-shaped.

[0016] The beneficial effect of this solution is that the guiding block in this solution will not be disengaged from the first guiding groove and the second guiding groove, and it is convenient for processing.

[0017] Further, the cross-section of the guiding block is dovetail-shaped.

[0018] The beneficial effect of this solution is that the guiding block in this solution will not be disengaged from the first guiding groove and the second guiding groove, and it is convenient for processing.

[0019] Further, the pusher is located outside the intake cavity, and the end of the opening valve core away from the communication port penetrates through the side wall of the intake cavity opposite to the communication port and is in sliding seal with the side wall.

[0020] The beneficial effect of this solution is that the use of the pusher in this solution will not be affected by the pressure in the intake cavity, and its failure rate can be reduced.

[0021] Further, the diameter of the opening valve core at the end close to the communication port is greater than that at the end away from the communication port.

[0022] The beneficial effect of this solution is that when the pusher drives the opening valve core to move away from the communication port, the opening valve core in this solution will not be disengaged from the intake cavity, avoiding leakage of compressed gas.

[0023] Further, the axial cross-section of the opening valve core is T-shaped, a ring-shaped limiting side wall is formed on the opening valve core, and an annular buffer pad is fixed on the limiting side wall.

[0024] The beneficial effect of this solution is that when the opening valve core slides away from the communication port, the buffer pad prevents the opening valve core from directly contacting and colliding with the inner wall of the intake cavity, avoiding damage to the opening valve core and the inner wall of the intake cavity.

[0025] Further, a valve core sleeve is provided between the side wall of the intake cavity opposite to the communication port and the limiting side wall. The valve core sleeve is sleeved on the opening valve core and is detachably connected to the inner wall of the intake cavity, and the opening valve core is in sliding fit with the valve core sleeve.

[0026] The beneficial effects of this solution are as follows: The valve core sleeve can guide the sliding of the opening valve core, preventing the opening valve core from tilting.

[0027] Furthermore, a sealing gasket is fixed to one end of the opening valve core facing the communication port.

[0028] The beneficial effects of this solution are as follows: After the opening valve core presses against the side wall where the communication port is located, the sealing gasket can seal the gap between the opening valve core and the side wall, further improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is the front vertical sectional view of Embodiment 1 of the present invention;

[0030] Figure 2 is Figure 1 the enlarged view of A in

[0031] Figure 3 is Figure 2 the perspective view of the opening valve core and the connection assembly in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following is a further detailed description through specific embodiments:

[0033] The reference numerals in the accompanying drawings of the specification include: ejection cylinder 1, ejection chamber 11, intake chamber 12, piston 13, middle cylinder end cover 2, communication port 21, opening valve core 3, limiting side wall 31, first guiding groove 32, buffer pad 4, valve core sleeve 5, pushing member 6, positioning sleeve 61, gas storage tank 7, opening 71, cross adapter A 8, second guiding groove 81, convex block 82, cross adapter B 9, guiding block 91.

[0034] Embodiment

[0035] An ejection device, as Figure 1 , Figure 2 and Figure 3 shown, includes an ejection cylinder 1, a gas storage tank 7, a gas supply member (not shown in the figure), an opening valve core 3, a pushing member 6 and a connection assembly. The gas supply member is connected to the gas storage tank 7 through a pipeline. In this embodiment, the gas supply member uses an air compressor. In actual implementation, a gas pump can also be used as the gas supply member.

[0036] An ejection chamber 11 and an intake chamber 12 are provided in the ejection cylinder 1. Specifically, in this embodiment, a middle cylinder end cover 2 is installed in the inner cavity of the ejection cylinder 1 by screws, dividing the inner cavity of the ejection cylinder 1 into an ejection chamber 11 on the left side of the middle cylinder end cover 2 and an intake chamber 12 on the right side of the middle cylinder end cover 2. A communication port 21 is provided on the middle cylinder end cover 2 to connect the ejection chamber 11 and the intake chamber 12.

[0037] The piston 13 of the ejection cylinder 1 is in sliding seal with the ejection chamber 11. The piston rod is located on the left side of the piston 13 and extends from the left end of the ejection cylinder 1. Specifically, the connection methods of the piston 13, the piston rod and the ejection cylinder 1 are the same as those in the prior art, and will not be elaborated in this embodiment.

[0038] The opening valve core 3 is directly opposite to the communication port 21. The cross-section of the opening valve core 3 along the vertical direction is T-shaped, that is, the diameter of the left end of the opening valve core 3 is larger than that of the right end, and the diameter of the left end of the opening valve core 3 is larger than the diameter of the communication port 21. A limiting side wall 31 parallel to the right inner wall of the intake chamber 12 is formed on the side wall of the opening valve core 3, and an annular buffer pad 4 is adhesively bonded on the limiting side wall 31. The right end of the opening valve core 3 horizontally penetrates through the right side wall of the intake chamber 12 and is in sliding seal with the right side wall. A valve core sleeve 5 is sleeved on the opening valve core 3. In this embodiment, the valve core sleeve 5 is located between the right side wall of the intake chamber 12 and the limiting side wall 31 and is installed on the right inner wall of the intake chamber 12 by screws. The valve core sleeve 5 in this embodiment is made of copper and is in sliding seal with the opening valve core 3 to guide the sliding of the opening valve core 3. The buffer pad 4 abuts against the left end of the valve core sleeve 5 to limit the opening valve core 3. In actual implementation, a sealing pad can also be adhesively bonded to the left end of the opening valve core 3 to enhance the sealing effect of the opening valve core 3 on the communication port 21. Specifically, both the buffer pad 4 and the sealing pad are made of elastic rubber material.

[0039] The pushing member 6 is located on the right side of the ejection cylinder 1. A positioning sleeve 61 is provided between the pushing member 6 and the ejection cylinder 1. The cross-section of the positioning sleeve 61 along the vertical direction is I-shaped, and through grooves are provided at the top and bottom of the positioning sleeve. The positioning sleeve 61 is sleeved on the left end of the opening valve core 3, and the left end of the positioning sleeve 61 is fixed to the right end of the ejection cylinder 1 by screws. The pushing member 6 is installed on the right end of the positioning sleeve 61 by screws. In actual implementation, a frame can also be provided, and the outer shell of the ejection cylinder 1 and the pushing member 6 can be installed on the frame, or the outer shell of the ejection cylinder 1 and the pushing member 6 can be fixed to the surrounding frame or other equipment, as long as the outer shell of the ejection cylinder 1 and the pushing member 6 can be positioned.

[0040] In this embodiment, the pusher 6 is a cylinder, and the connecting assembly is located between the opening valve core 3 and the piston rod of the pusher 6. Specifically, the connecting assembly includes a cross adapter A8 and a cross adapter B9. A groove is provided at the left end of the piston rod of the pusher 6, and a convex block 82 is integrally formed at the right end of the cross adapter A8. The convex block 82 is located in the groove and is threadedly connected to the groove. The cross adapter B9 is located on the left side of the cross adapter A8. A first guide groove 32 is provided at the right end of the opening valve core 3, and a second guide groove 81 is provided at the left end of the cross adapter A8. The first guide groove 32 and the second guide groove 81 penetrate through the opening valve core 3 and the cross adapter A8 in the radial direction respectively, and the projection of the first guide groove 32 to the right is perpendicular to the second guide groove 81. Guide blocks 91 are integrally formed at both the left end and the right end of the cross adapter B9. The width of the end of the guide block 91 away from the cross adapter B9 is greater than the width of the end close to the cross adapter B9. Specifically, the guide block 91 in this embodiment is T-shaped. In actual implementation, the first guide groove 32, the second guide groove 81 and the guide block 91 can also be dovetail-shaped, so that after the two guide blocks 91 slide into the first guide groove 32 and the second guide groove 81 respectively, there will be no relative movement along the axial direction between the opening valve core 3, the cross adapter B9 and the cross adapter A8, ensuring that the pusher 6 can drive the opening valve core 3 to slide. In this embodiment, the first guide groove 32 and the second guide groove 81 respectively position the cross adapter B9 in the X-axis and Y-axis directions, so that during the sliding process of the opening valve core 3, there will be no displacement in the X-axis and Y-axis directions between the opening valve core 3, the cross adapter B9 and the cross adapter A8, ensuring good coaxiality between the opening valve core 3, the cross adapter B9 and the cross adapter A8. The ejection chamber 11, the cylinder end cover 2, the communication port 21, the intake chamber 12, the opening valve core 3, the cross adapter B9, the cross adapter A8 and the piston rod of the pusher 6 in this embodiment are all coaxial.

[0041] In this embodiment, the gas storage tank 7 is located above the ejection cylinder 1, and aligned and communicating openings 71 are provided at the bottom of the gas storage tank 7 and the top of the intake chamber 12.

[0042] The specific implementation process is as follows:

[0043] Before the test, manually start the pusher 6 first, push the opening valve core 3 to the left, so that the left end of the opening valve core 3 presses against the right wall of the middle part 2 of the cylinder end cover to close the communication port 21. Then close the pusher 6 and the opening air supply part, and send compressed gas into the air storage tank 7. The gas simultaneously enters the intake cavity 12 through the opening 71. When the pressures in the intake cavity 12 and the air storage tank 7 reach the requirements, close the air supply part, start the pusher 6, and control the opening valve core 3 to slide to the right through the pusher 6. The opening valve core 3 releases the communication port 21, and the compressed gas in the intake cavity 12 and the air storage tank 7 quickly enters the space on the left side of the piston 13 of the ejection cylinder 1, causing the piston 13 and the piston rod of the ejection cylinder 1 to slide quickly to the left.

[0044] When it is necessary to further increase the impact energy of the ejection test, it is necessary to increase the pressures in the intake cavity 12 and the air storage tank 7. At this time, further push the opening valve core 3 to the left through the pusher 6 to increase the pressure between the left end of the opening valve core 3 and the middle part 2 of the cylinder end cover. That is, under the condition of increased pressure, the compressed gas will not leak from the communication port 21, and a greater pressure requirement can be achieved.

[0045] When the diameter of the designed communication port 21 is increased, at the same time, increase the diameter of the left end of the opening valve core 3 so that the opening valve core 3 can cover and close the communication port 21. Compared with directly using a valve, the diameter of the communication port 21 in this embodiment can be set arbitrarily, and there is no need to consider whether the size of the valve can be installed. The design and production are more convenient.

[0046] The above are only embodiments of the present invention. Specific technical solutions and / or common knowledge such as characteristics well known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to explain the content of the claims.

Claims

1. A catapult device, comprising a catapult cylinder, an air storage tank and an air supply member, the air supply member being communicated with the air storage tank, a catapult chamber being provided in the catapult cylinder, a piston being slidably sealed in the catapult chamber, and a piston rod being fixed on the piston, characterized in that: An air inlet cavity is further provided in the ejection cylinder. The air inlet cavity is communicated with the air storage tank. A communication port for communicating the ejection cavity with the air inlet cavity is provided in the ejection cylinder. An opening valve core is provided in the air inlet cavity. The opening valve core is opposite to the communication port and is used to close the communication port. The opening valve core is connected with a pushing member for pushing the opening valve core to slide. A connecting component is provided between the opening valve core and the pushing member. The connecting component includes a cross joint A and a cross joint B. The cross joint A is connected with the pushing member. A first guiding groove is provided at one end of the opening valve core away from the communication port. A second guiding groove is provided at one end of the cross joint A close to the communication port. The included angle between the projection of the first guiding groove along the axial direction of the cross joint B and the second guiding groove is less than or equal to 90°. Guide blocks are fixed at both ends of the cross joint B, and the two guide blocks are respectively located in the first guiding groove and the second guiding groove. The cross-sectional shape of the opening valve core along the axial direction is T-shaped. An annular limiting side wall is formed on the opening valve core. A valve core sleeve is provided between the side wall of the air inlet cavity opposite to the communication port and the limiting side wall. The valve core sleeve is sleeved on the opening valve core and is detachably connected with the inner wall of the air inlet cavity. The opening valve core is in sliding fit with the valve core sleeve, and the valve core sleeve is also in sliding seal with the opening valve core. A sealing gasket is fixed at one end of the opening valve core facing the communication port.

2. The ejection device according to claim 1, wherein: The two guide blocks are respectively in sliding fit with the first guiding groove and the second guiding groove, and the width of the end of the guide block away from the cross joint B is greater than the width of the end close to the cross joint B.

3. The ejection device according to claim 2, characterized in that: The cross-sectional shape of the guide block is T-shaped.

4. The ejection device according to claim 2, characterized in that: The cross-sectional shape of the guide block is dovetail-shaped.

5. A catapult device according to claim 1, characterized in that: The pushing member is located outside the air inlet cavity. One end of the opening valve core away from the communication port penetrates through the side wall of the air inlet cavity opposite to the communication port and is in sliding seal with the side wall.

6. The ejection device according to claim 5, characterized in that: The diameter of one end of the opening valve core close to the communication port is greater than the diameter of the end away from the communication port.

7. An ejection device according to claim 6, characterized in that: An annular buffer pad is fixed on the limiting side wall.

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