A hydraulically controlled impact load launching valve

Abstract

The present invention provides a hydraulically controlled impact load launching valve, comprising a main valve body, a launching power output port is arranged on the top of the main valve body, and the launching power output port is connected to the outside; a pressure chamber is arranged inside the main valve body, and the pressure chamber is connected to the launching power output port; the pressure chamber is used to access external hydraulic oil or hydraulic gas as launching power; a main valve core is also arranged inside the main valve body; the top of the main valve core is clamped and sleeved inside the launching power output port; the middle of the main valve core cooperates with the pressure chamber to form a closed annular chamber; the bottom of the main valve core is clamped and sleeved in the bottom of the main valve body, and the contact surfaces of the two are tightly fitted; the bottom surface of the main valve body is provided with a main valve cover, and the main valve cover forms a closed structure with the inner wall of the first blind hole of the main valve core and the inner wall of the bottom of the main valve body. The present invention is suitable for launching medium and high-speed impact loads by outputting hydraulic or pneumatic power according to a preset curve, so that the load moves according to a set rule.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic control, and in particular relates to a hydraulically controlled impact load launching valve. Background Art

[0002] Impact load launching devices powered by hydraulic or pneumatic pressure usually need to respond to launching instructions in a short time and output hydraulic or pneumatic power according to a preset regular curve, and the output regularity of pneumatic hydraulic power can be realized by launching valves.

[0003] A typical gas-hydraulic launcher is mainly composed of a gas pressure or hydraulic power source, an electromagnetic reversing valve, a variable flow valve and its accessories. However, this gas-hydraulic launcher generally has the following disadvantages: ① large impact overload and uncontrollable launch process; ② long launch acceleration distance and slow deceleration; ③ difficult to meet the needs of medium and high-speed launch. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology and to provide a hydraulically controlled impact load launching valve, which is particularly suitable for outputting hydraulic or pneumatic power according to a preset curve to launch medium and high-speed impact loads, so that the load moves according to a set rule.

[0005] The technical solution adopted by the present invention is: a hydraulically controlled impact load launching valve, comprising a main valve body, a launching power output port is arranged on the top of the main valve body, and the launching power output port is connected to the outside; a pressure chamber is arranged inside the main valve body, and the pressure chamber is connected to the launching power output port; the diameter of the launching power output port is smaller than that of the pressure chamber; the pressure chamber is used to connect external hydraulic oil or hydraulic gas as launching power; a main valve core is also arranged inside the main valve body; the top of the main valve core is clamped and sleeved inside the launching power output port; the middle part of the main valve core cooperates with the pressure chamber to form a closed annular chamber; the bottom of the main valve core is clamped and sleeved in the bottom of the main valve body, and the contact surfaces of the two are tightly fitted; the diameter of the top of the main valve core is smaller than that of the pressure chamber; the pressure chamber is used to connect external hydraulic oil or hydraulic gas as launching power; the main valve core is also arranged inside The diameter is smaller than the diameter of the middle and bottom of the main valve core; the diameters of the middle and bottom of the main valve core are the same; the main valve core is coaxially provided with a first blind hole opening downward; the bottom surface of the main valve body is provided with a main valve cover, and the main valve cover forms a closed structure with the inner wall of the first blind hole of the main valve core and the inner wall of the bottom of the main valve body; it also includes a first spring; the top end of the first spring is fixedly connected to the top surface of the first blind hole of the main valve core, and the other end of the first spring is fixed to the upper surface of the main valve cover; after the launch power enters the pressure chamber, it acts on the top of the middle part of the main valve core and generates downward pressure to make the main valve core move downward, and the top of the main valve core enters the pressure chamber so that the pressure chamber of the main valve body is connected to the outside through the launch power output port and outputs the launch power.

[0006] In the above technical solution, a special hole is provided on the top of the main valve core, one end of the special hole is opened on the top surface of the main valve core, and the other end of the special hole is opened on the side of the main valve core; after the top of the main valve core enters the pressure chamber, the special hole is used to connect the pressure chamber with the outside.

[0007] In the above technical solution, a control oil circuit interface is provided on the main valve cover, which is used to introduce the hydraulic oil for controlling the action of the launch valve into the bottom of the main valve core.

[0008] The above technical solution also includes a first-level buffer piston, a second spring, a connecting flange and a buffer cylinder; the buffer cylinder is coaxially fixed to the bottom surface of the main valve body through the connecting flange; the top end of the first-level buffer piston is fixed to the top surface of the first blind hole of the main valve core, and the first spring is sleeved on the outside of the first-level buffer piston; the bottom end of the first-level buffer piston is arranged in the buffer cylinder; the top end of the second spring is fixedly connected to the bottom surface of the first-level buffer piston, and the bottom end of the second spring is fixedly connected to the bottom surface of the buffer cylinder.

[0009] In the above technical scheme, the first-level buffer piston is a stepped structure with a bottom diameter larger than the middle diameter; the bottom of the first-level buffer piston is in close contact with the lower inner wall of the buffer cylinder, and the bottom surface of the first-level buffer piston cooperates with the lower inner wall and the bottom surface of the buffer cylinder to form a closed cavity; the middle outer surface of the first-level buffer piston cooperates with the upper inner wall of the buffer cylinder and the top surface of the buffer cylinder to form a closed cavity; the first-level buffer piston is coaxially provided with a second blind hole opening downward; the wall of the second blind hole is provided with a drainage hole for connecting the buffer cylinder outside the first-level buffer piston and the inside of the second blind hole; the drainage hole is located in the middle of the first-level buffer piston; the upper inner wall and the lower inner wall of the buffer cylinder are respectively provided with throttling holes that are interconnected through a pipeline located outside the buffer cylinder; hydraulic oil is provided at the bottom of the buffer cylinder.

[0010] The above technical solution also includes a secondary buffer piston, the top end of the secondary buffer piston is coaxially arranged inside the second blind hole of the primary buffer piston, the bottom end of the secondary buffer piston is fixed to the bottom surface of the buffer cylinder, and the second spring is sleeved on the outer side of the secondary buffer piston; the head of the secondary buffer piston is a frustum structure; the top of the second blind hole is an inverted conical structure; the top surface diameter of the head of the secondary buffer piston is smaller than the bottom surface diameter of the top of the second blind hole.

[0011] In the above technical solution, an adjustment gasket is arranged between the bottom end of the secondary buffer piston and the bottom surface of the buffer cylinder.

[0012] In the above technical solution, an annular groove is provided on the outer surface of the middle part of the main valve core.

[0013] In the above technical solution, a speed regulating valve is arranged on the pipeline outside the buffer cylinder.

[0014] In the above technical solution, the control oil circuit interface is connected with an external oil inlet pipeline, and a reversing valve is arranged on the oil inlet pipeline.

[0015] The beneficial effects of the present invention are as follows: the present invention studies and sets the special-shaped hole of the main valve core and the buffer, so that the special-shaped hole and the buffer work together, and the hydraulic oil or high-pressure gas output by the launch power source can be controlled to be injected into the load actuator according to a certain rule, thereby ensuring that the pressure required for the launch load changes according to the set curve, and realizing the controllability of the launch process. The present invention releases the launch power at a speed that is first fast and then slow through the design of the two-stage buffer function, meeting the requirements of high-speed impact load launch. The interior of the buffer of the present invention is always a closed oil chamber filled with hydraulic oil, which improves the lubrication between the buffer elements and is not prone to motion jam. The most important thing is that a self-circulating hydraulic system is formed in the cylinder barrel through the small holes on the side wall of the buffer cylinder and the throttling small holes on the first-stage buffer piston, and no oil needs to be replenished, which greatly reduces the oil flow rate required to be supplied by the external oil source. The present invention has an emergency braking function. When an emergency stop is required during the launch process, the launch power oil circuit (or gas circuit) can be urgently closed by using the electromagnetic reversing valve and the control oil circuit can be opened to achieve launch blocking. The present invention integrates the functions of the launch valve and the buffer in one valve body, greatly reducing the volume of the launch valve and reducing the preparation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the hydraulically controlled impact load launching valve of the present invention.

[0017] Figure 2 It is a schematic diagram of the oil (gas) circuit interface of the main valve body of the present invention.

[0018] Figure 3 It is a schematic diagram of the main valve core structure of the present invention.

[0019] Figure 4 It is a schematic diagram of the structure of the primary buffer piston of the present invention.

[0020] Figure 5 It is a schematic diagram of the throttle hole of the buffer of the present invention.

[0021] Figure 6 It is a schematic diagram of the structure of the secondary buffer piston of the present invention.

[0022] Figure 7 It is a schematic diagram of the annular pressure equalizing groove on the lower edge of the output port of the main valve body that emits power.

[0023] Figure 8 It is a hydraulic principle diagram of the impact load launching device based on the present invention.

[0024] Among them, 1-main valve body, 2-main valve core, 3-first spring, 4-main valve cover, 5-first-stage buffer piston, 6, 7-bolts, 8-connecting flange, 9-buffer cylinder, 10-secondary buffer piston, 11-second spring, 12-adjusting gasket, 13-launching power output port, 14-launching power source interface, 15-control oil circuit interface, 16-launching pressure area, 17-control pressure area, 18-special hole, 19-annular groove, 20, 21-throttle hole, 22-drainage hole, 23-annular pressure equalizing groove, 24-hydraulic pump station, 25-launching valve locking accumulator, 26, 27, 28, 29-electromagnetic reversing valve, 30-load launching actuator, 31-launching power accumulator, 32-hydraulic impact load valve, 33-speed regulating valve, 34-oil tank, 35-first blind hole, 36-second blind hole. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0026] like Figure 1 As shown, the present invention provides a hydraulically controlled impact load launching valve, which includes a launching main valve and a buffer. The upper part of the launching valve is the launching main valve, which is used to control the oil circuit or gas circuit from the launching power source to the load launching actuator; the lower part of the launching valve is the buffer, which is used to control the speed and size of the launching power output.

[0027] Wherein: the launch main valve includes a main valve body 1, a main valve core 2, a first spring 3 and a main valve cover 4, etc.; the buffer includes a primary buffer piston 5, bolts 6, 7, a connecting flange 8, a buffer cylinder 9, a secondary buffer piston 10, a second spring 11, an adjusting gasket 12, etc. The connecting flange 8 serves as the cylinder cover of the buffer cylinder to achieve the sealing of the buffer, and also serves as a connecting flange between the launch main valve and the buffer to achieve the rigid connection and functional coordination between the two.

[0028] A launch power output port 13 is arranged on the top of the main valve body 1, and the launch power output port 13 is connected to an external load; a pressure chamber is arranged inside the main valve body, and the pressure chamber is connected to the launch power output port; the diameter of the launch power output port 13 is smaller than the pressure chamber; the pressure chamber is used to access external hydraulic oil or hydraulic gas as a launch power; a main valve core 2 is also arranged inside the main valve body 1; the top of the main valve core 2 is sleeved inside the launch power output port 13; the middle of the main valve core 1 cooperates with the pressure chamber to form a closed annular chamber; the bottom of the main valve core 1 is clamped It is arranged to be sleeved in the bottom of the main valve body and the contact surfaces of the two are tightly fitted; the diameter of the top of the main valve core 1 is smaller than the diameter of the middle and bottom of the main valve core 1; the diameters of the middle and bottom of the main valve core 1 are the same; the main valve core 1 is coaxially provided with a first blind hole 35 opening downward; the bottom surface of the main valve body 1 is provided with a main valve cover 4, and the main valve cover 4 forms a closed structure with the inner wall of the first blind hole 35 of the main valve core and the inner wall of the bottom of the main valve body; it also includes a first spring 3; the top end of the first spring 3 is fixedly connected to the top surface of the first blind hole 35 of the main valve core, and the other end of the first spring 3 is fixed to the upper surface of the main valve cover 4.

[0029] The interior of the main valve body 1 is an annular pressure chamber. After the hydraulic oil or pressurized gas used as the launch power enters the chamber, it acts on the shoulder area of ​​the main valve core 2, generating downward pressure. When the downward pressure on the main valve core 2 is greater than the upward pressure on the valve core 2 by the control oil circuit and springs 3 and 11, the main valve core 2 begins to move downward, and the launch power output port 13 of the main valve body 1 opens to output gas-hydraulic power. An adjustment gasket 12 is provided at the bottom of the buffer, and the position of the secondary buffer piston 9 can be adjusted according to the actual launch working conditions, thereby adjusting the buffer damping coefficient. The connecting flange 8 serves as the cylinder head of the buffer cylinder 9 to achieve the sealing of the buffer, and also as the connecting flange of the launch main valve and the buffer to achieve the rigid connection and functional coordination between the two.

[0030] Figure 2The diagram shows the oil and gas circuit interface of the main valve body 1 of the present invention. The main valve body 1 provides an interface 14 with the launch power source and an interface with the launch load, that is, a launch power output port 13; the main valve core 2 is located in the main valve body 1, and controls the opening and closing of the interface 13 between the launch valve and the launch load by moving up and down, so that the gas and hydraulic pressure input into the main valve body is output to the actuator according to a preset curve; the first spring 3 is located in the main valve core 2 and pre-compressed to exert an upward thrust to maintain the upward closed state of the main valve core 2; the first spring 3 cooperates with the control oil circuit to maintain the closed state of the main valve core, and at the same time, when the system launch pressure and the control oil circuit pressure are not established, the valve core is always kept in a closed state to ensure the stability of the output pressure of the launch main valve, and the main valve core 2 is restored to a closed state after the system completes a launch. The main valve cover 4 forms a closed pressure space 17 between the main valve core 2 and the main valve cover 4. At the same time, a control oil circuit interface 15 is provided on the main valve cover 4 to guide the hydraulic oil controlling the action of the launch valve to the bottom of the main valve core 2, and lift the main valve core 2 to make the output port 13 of the launch power in a closed state, so that the space inside the main valve body 1 is divided into an upper launch pressure zone 16 (i.e., a pressure chamber) and a lower control pressure zone 17.

[0031] like Figure 3 As shown, the main valve core 2 is an inverted cup-shaped structure, and four special holes 18 are opened on the upper part of the main valve core 2. One end of the special hole 18 opens on the top surface of the main valve core 2, and the other end of the special hole 18 opens on the side of the main valve core. When the main valve core 2 is not in motion, it is applied with an upward thrust by the first spring 3 and the control oil circuit to close the launch power output port 13. At this time, the launch valve cannot output the launch power. As the main valve core 2 moves downward, the special hole 18 gradually exposes the launch pressure area 16, connects the launch pressure area 16 with the launch power output port 13, and outputs the launch power. As the valve core 2 moves downward, the gap area exposed by the special hole 18 gradually increases, and the output launch power also gradually increases. An annular groove 18 is opened on the middle outer surface of the main valve core 2. The annular groove increases the downward pressure area of ​​the valve core to further improve the response speed of the valve core. As shown Figure 7 As shown, an annular pressure equalizing groove 23 is added to the lower edge of the launch power output port 13 to maintain the pressure balance on the upper end surface of the main valve core 2 to avoid the valve core 2 from getting stuck due to uneven force on the upper end surface of the main valve core 2 when the main valve core 2 moves downward.

[0032] like Figure 4As shown, the top of the primary buffer piston 5 is fixed to the top surface of the first blind hole 35 of the main valve core, and the first spring 3 is sleeved on the outside of the primary buffer piston 5; the bottom of the primary buffer piston 5 is arranged in the buffer cylinder 9; the top of the second spring 11 is fixedly connected to the bottom surface of the primary buffer piston 5, and the bottom of the second spring 11 is fixedly connected to the bottom surface of the buffer cylinder 9. The top of the secondary buffer piston 10 is coaxially arranged inside the second blind hole 36 of the primary buffer piston, the bottom of the secondary buffer piston 10 is fixed to the bottom surface of the buffer cylinder 9, and the second spring 11 is sleeved on the outside of the secondary buffer piston 10; the head of the secondary buffer piston 10 is a frustum structure; the top of the second blind hole 26 is an inverted cone structure; the top surface diameter of the head of the secondary buffer piston is smaller than the bottom surface diameter of the top of the second blind hole. The wall of the second blind hole 36 is provided with a drainage hole 22 for connecting the buffer cylinder outside the primary buffer piston and the inside of the second blind hole.

[0033] The piston rod at the top of the first-level buffer piston contacts and cooperates with the main valve core 2, and transmits the power of the main valve core 2 when it moves downward to the buffer. The lower piston head of the first-level buffer piston is an inverted cup-shaped structure, and the outer circle of the piston head cooperates with the inner circle of the buffer cylinder 9 to form a first-level buffer structure, and the inner circle of the piston head cup-shaped structure cooperates with the second-level buffer piston 10 to form a second-level buffer structure. Two drainage holes 22 are opened on the cup-shaped wall of the piston head. When the first-level buffer piston 5 moves downward, part of the hydraulic oil in the lower part of the buffer cylinder barrel is pressed into the upper part of the buffer cylinder through the two drainage holes 22, and it is also convenient for the head of the second-level buffer piston 10 to enter the inner cavity of the piston head cup-shaped structure of the first-level buffer piston 5 to realize a smooth transition between the first and second buffers. The second spring 11 maintains the first-level buffer piston piston rod 5 and the main valve core 2 in a contact state when the system launch pressure is not established to ensure the stability of the launch main valve output pressure and the stability of the buffer process, and restores the first-level buffer piston 5 to the initial state after the system completes a launch.

[0034] like Figure 5 As shown, the side wall of the buffer cylinder 9 is provided with throttle holes 20 and 21 that are interconnected, and a pipeline located outside the buffer cylinder is connected between the two throttle holes. The pipeline is provided with a speed regulating valve 33 for adjusting the buffer speed, and the cylinder is filled with hydraulic oil to form a self-circulating hydraulic system. When the main valve core 2 is opened, the main valve core 2 pushes the primary buffer piston 5 to move downward, and the hydraulic oil in the lower part of the buffer cylinder barrel is pressed into the upper part of the buffer cylinder through the throttle holes 20 and 21 on the side wall of the buffer cylinder. The movement speed of the primary buffer piston is adjusted by the speed regulating valve 33, thereby realizing the primary buffer; when the primary buffer piston 5 continues to move downward, the head of the secondary buffer piston 10 gradually enters the inner cavity of the piston head cup-shaped structure of the primary buffer piston 5, and forms a hydraulic cushion in the closed space of the inner cavity.

[0035] like Figure 6As shown, the piston head of the secondary buffer piston 10 is designed as a frustum structure. As the head of the secondary buffer piston 10 enters the inner cavity of the piston head cup-shaped structure of the primary buffer piston 5, the depth gradually increases, the gap between the head of the secondary buffer piston 10 and the inner cavity of the piston head cup-shaped structure of the primary buffer piston also gradually becomes thinner, and the damping of the throttling buffer also gradually increases. Under the joint action of the second spring 11, the primary buffer piston 5 finally stops moving downward, thereby realizing the secondary buffering of the opening speed of the main valve core 2. Therefore, the opening process of the launch valve is fast at first and then slow.

[0036] Figure 8 The application scenario of a specific embodiment is shown. In order to simplify the complexity of the system, the control oil circuit and the launch power oil circuit can share a hydraulic pump station 24. The hydraulic oil source inside the control oil circuit is the hydraulic pump station 24 or the oil tank 34. The control oil circuit is pressurized by the launch valve locking accumulator 25 and connected to the control oil circuit interface 15 of the launch valve. The electromagnetic reversing valve 26-29 controls the on-off of the control oil circuit to control the opening and closing of the main valve core 2 of the launch valve; the launch power oil circuit is pressurized by the launch power accumulator 31 and connected to the interface 14 of the launch power source of the launch valve. Under the action of the control oil circuit, the main valve core opens according to a preset rule to output the launch power hydraulic oil to the load launch actuator 30, and the launch load is matched with the design input through the control valve in the load launch actuator cylinder and the impact load launch unit.

[0037] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A hydraulically controlled impact load launching valve, characterized in that: It comprises a main valve body, a launch power output port is arranged on the top of the main valve body, and the launch power output port is connected to the outside; a pressure chamber is arranged inside the main valve body, and the pressure chamber is connected to the launch power output port; the diameter of the launch power output port is smaller than the pressure chamber; the pressure chamber is used to connect the external hydraulic oil as the launch power; a main valve core is also arranged inside the main valve body; the top of the main valve core is clamped and sleeved inside the launch power output port; the middle of the main valve core cooperates with the pressure chamber to form a closed annular chamber; the bottom of the main valve core is clamped and sleeved in the bottom of the main valve body, and the contact surfaces of the two are tightly fitted; the diameter of the top of the main valve core is smaller than the diameter of the middle and bottom of the main valve core; The diameters of the middle and bottom of the main valve core are the same; the main valve core is coaxially provided with a first blind hole opening downward; the bottom surface of the main valve body is provided with a main valve cover, and the main valve cover forms a closed structure with the inner wall of the first blind hole of the main valve core and the inner wall of the bottom of the main valve body; it also includes a first spring; the top end of the first spring is fixedly connected to the top surface of the first blind hole of the main valve core, and the other end of the first spring is fixed to the upper surface of the main valve cover; after the launch power enters the pressure chamber, it acts on the top of the middle part of the main valve core and generates downward pressure to make the main valve core move downward, and the top of the main valve core enters the pressure chamber so that the pressure chamber of the main valve body is connected to the outside through the launch power output port and outputs the launch power; A special hole is provided on the top of the main valve core, one end of the special hole is opened on the top surface of the main valve core, and the other end of the special hole is opened on the side of the main valve core; after the top of the main valve core enters the pressure chamber, the special hole is used to connect the pressure chamber with the outside; The main valve cover is provided with a control oil circuit interface for introducing the hydraulic oil for controlling the action of the launch valve into the bottom of the main valve core; It also includes a first-stage buffer piston, a second spring, a connecting flange and a buffer cylinder; the buffer cylinder is coaxially fixed to the bottom surface of the main valve body through the connecting flange; the top end of the first-stage buffer piston is fixed to the top surface of the first blind hole of the main valve core, and the first spring is sleeved on the outer side of the first-stage buffer piston; the bottom end of the first-stage buffer piston is arranged in the buffer cylinder; the top end of the second spring is fixedly connected to the bottom surface of the first-stage buffer piston, and the bottom end of the second spring is fixedly connected to the bottom surface of the buffer cylinder; The first-stage buffer piston is a stepped structure with a bottom diameter larger than a middle diameter; the bottom of the first-stage buffer piston is in close contact with the lower inner wall of the buffer cylinder, and the bottom surface of the first-stage buffer piston cooperates with the lower inner wall and the bottom surface of the buffer cylinder to form a closed cavity; the middle outer surface of the first-stage buffer piston cooperates with the upper inner wall of the buffer cylinder and the top surface of the buffer cylinder to form a closed cavity; the first-stage buffer piston is coaxially provided with a second blind hole opening downward; the wall of the second blind hole is provided with a drainage hole for connecting the buffer cylinder outside the first-stage buffer piston and the inside of the second blind hole; the drainage hole is located in the middle of the first-stage buffer piston; the upper inner wall and the lower inner wall of the buffer cylinder are respectively provided with throttling holes that are interconnected through a pipeline located outside the buffer cylinder; hydraulic oil is provided at the bottom of the buffer cylinder; It also includes a secondary buffer piston, the top end of which is coaxially arranged inside the second blind hole of the primary buffer piston, the bottom end of which is fixed to the bottom surface of the buffer cylinder, and the second spring is sleeved on the outer side of the secondary buffer piston; the head of the secondary buffer piston is a frustum structure; the top of the second blind hole is an inverted cone structure; the top surface diameter of the head of the secondary buffer piston is smaller than the bottom surface diameter of the top of the second blind hole; An adjusting gasket is arranged between the bottom end of the secondary buffer piston and the bottom surface of the buffer cylinder; An annular groove is provided on the outer surface of the middle part of the main valve core; an annular pressure equalizing groove is added to the lower edge of the launch power output port to maintain the pressure balance on the upper end surface of the main valve core, so as to avoid the valve core being stuck due to uneven force on the upper end surface of the main valve core during the downward movement of the main valve core; A speed regulating valve is arranged on the pipeline outside the buffer cylinder; The control oil circuit interface is connected with an external oil inlet pipeline, and a reversing valve is arranged on the oil inlet pipeline.

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