Prefill valve structure

Abstract

The invention discloses a prefill valve structure, and relates to the technical field of prefill valves. The prefill valve structure comprises a valve body, a valve element part, a piston part and an oil way driving assembly. An oil conveying cavity and a driving cavity which are independent of each other are arranged in the valve body, and the valve element piece is connected into the oil conveying cavity in a sliding mode. The piston piece is connected into the driving cavity in a sliding mode. The piston piece divides the driving cavity into a first cavity and a second cavity which are independent of each other, and the piston piece is connected with the valve element piece. The oil way driving assembly is used for injecting driving oil into or discharging driving oil out of the first cavity. According to the technical scheme provided by the invention, hydraulic oil can be slowly injected into the oil cylinder, and quick response and closing can be realized to reduce waiting delay time.

Description

Technical Field

[0001] The invention relates to the technical field of liquid filling valves, and in particular to a liquid filling valve structure. Background Art

[0002] The filling valve is widely used in forging machinery, high-speed punching machines, presses or injection molding machines and other machinery and equipment. It is mainly used to inject the hydraulic oil in the accumulator into the oil cylinder of the mechanical equipment to ensure that the mechanical equipment can operate effectively. Among them, the common filling valve includes a valve body and a valve core, and the valve body is provided with an oil inlet hole and an oil outlet hole; during operation, by adjusting the internal pressure value of the accumulator, when the pressure value of the accumulator is higher than the pressure value of the oil cylinder, the pressure difference will drive the valve core to move relative to the valve body and open the oil inlet hole, so that the oil inlet hole and the oil outlet hole are connected to each other, and the hydraulic oil flows from the accumulator through the oil inlet hole and the oil outlet hole of the filling valve and flows to the oil cylinder, so as to realize the oil filling operation of the oil cylinder; when the pressure value of the accumulator is lower than the pressure value of the oil cylinder, a negative pressure difference is formed inside the accumulator, and the pressure difference will drive the valve core to move relative to the valve body and close the oil inlet hole, so as to isolate the connection between the oil inlet hole and the oil outlet hole, so as to stop the oil filling operation of the oil cylinder.

[0003] In the prior art, on the one hand, since the hydraulic oil will be quickly injected into the cylinder when the filling valve is filling the cylinder, this process will produce a flow impact on the rear chamber of the cylinder, thereby affecting the smoothness of the cylinder movement; on the other hand, the closing of the filling valve is achieved by adjusting the pressure difference between the accumulator and the cylinder, that is, the closing of the filling valve is passive, and the passive closing method will cause a certain waiting lag time when the filling valve is closed, that is, the filling valve cannot respond quickly to closing.

[0004] Based on the above reasons, there is an urgent need for a new type of filling valve that can slowly inject hydraulic oil into the cylinder and quickly respond to closing to reduce waiting lag time.

[0005] It should be noted that the above contents are only used to assist in understanding the technical solution of the present invention, and do not constitute an admission that the above contents are prior art. Summary of the invention

[0006] The main purpose of the present invention is to propose a filling valve structure, which aims to achieve the goal of both slowly injecting hydraulic oil into the cylinder and quickly responding to closing to reduce the waiting lag time.

[0007] To achieve the above-mentioned purpose, the present invention provides a liquid filling valve structure; Specifically, the filling valve structure includes: A valve body, wherein the valve body is provided with an independent oil delivery chamber and a drive chamber, wherein the oil delivery chamber is used as a flow space for hydraulic oil; the oil delivery chamber is connected with an oil inlet hole and an oil outlet hole, wherein the oil inlet hole is used to communicate with the energy accumulator, and the oil outlet hole is used to communicate with the oil cylinder; A valve core member, the valve core member being slidably connected in the oil delivery chamber; A piston member, the piston member is slidably connected to the driving chamber; the piston member divides the driving chamber into a first chamber and a second chamber that are independent of each other, wherein the first chamber is located on a side of the second chamber away from the oil delivery chamber; the piston member is connected to the valve core member; An oil circuit drive assembly, the oil circuit drive assembly is used to inject or discharge drive oil into the first chamber; When the oil circuit driving component performs the injection operation of the driving oil into the first chamber, the piston moves toward the second chamber and drives the valve core to move toward the oil inlet hole to close the oil inlet hole; When the oil circuit driving component performs the discharge operation of the driving oil to the first chamber, the piston member moves toward the first chamber and drives the valve core member to move away from the oil inlet hole to open the oil inlet hole, and the movement speed of the valve core member at this time is defined as a first speed; at the same time, when the valve core member is driven by the pressure of the accumulator to move away from the oil inlet hole to open the oil inlet hole, the movement speed of the valve core member at this time is defined as a second speed; wherein the first speed is slower than the second speed.

[0008] In one embodiment, the valve body includes a valve body part and a valve body base, and the valve body part and the valve body base are detachably sealed and connected; the oil inlet hole and the oil outlet hole are arranged on the valve body part; the valve body base is provided with a driving oil hole, and the oil circuit driving assembly is connected to the first chamber through the driving oil hole.

[0009] In one embodiment, the oil circuit drive assembly includes a drive oil control device, and the drive oil control device is used to inject or discharge the drive oil into the first chamber; Furthermore, the oil circuit drive assembly further comprises a throttling device, the two ends of which are respectively connected to the first chamber and the drive oil control device; wherein the throttling device is used to measure the flow rate of the drive oil; Furthermore, the oil circuit drive assembly further comprises a one-way valve, which is arranged in parallel with the throttling device; the passage direction of the one-way valve points to the drive oil control device.

[0010] In one embodiment, the oil cylinder is provided with a pressure sensor and / or a displacement sensor, and the pressure sensor and / or the displacement sensor is electrically connected to the driving oil control device via a controller.

[0011] In one embodiment, a piston cavity is provided inside the piston member, a piston spring is provided inside the piston cavity, and two ends of the piston spring are respectively connected to the piston member and the first chamber; wherein the direction of the elastic force of the piston spring is toward a direction away from the oil inlet hole.

[0012] In one embodiment, a first groove is annularly provided on the outer side of the piston member, a first sealing ring is installed in the first groove, and the first sealing ring is sealingly fitted with the inner side of the driving chamber.

[0013] In one embodiment, a valve core cavity is provided inside the valve core component, a valve core spring is provided inside the valve core cavity, and two ends of the valve core spring are respectively connected to the valve core component and the piston component; wherein the direction of the elastic force of the valve core spring is toward a direction away from the oil inlet hole.

[0014] In one embodiment, a plurality of oil through holes are formed on the side of the valve core member, and the oil through holes are connected to the oil delivery chamber and the inner cavity of the valve core.

[0015] In one embodiment, a guide sleeve is fixedly disposed inside the valve body, and the guide sleeve is located between the oil delivery chamber and the drive chamber; a guide hole is provided through the middle of the guide sleeve, and at least part of the valve core member and at least part of the piston member are slidably connected in the guide hole.

[0016] In one embodiment, a second groove is annularly provided on the outer side of the guide sleeve, a second sealing ring is installed in the second groove, and the second sealing ring is sealingly fitted with the inner side of the valve body.

[0017] In one embodiment, a plurality of third grooves are annularly arranged on the outer side of the valve core member and / or the piston member, and the plurality of third grooves are distributed at intervals along the axis of the guide hole.

[0018] In one embodiment, a valve seat ring with an annular structure is installed at the oil inlet hole, and when the valve core member closes the oil inlet hole, the valve core member and the valve seat ring contact each other; and, the end of the valve core member for contacting the valve seat ring is provided with a first chamfer, and the end of the valve seat ring for contacting the valve core member is provided with a second chamfer, and the inclination angle of the first chamfer is smaller than the inclination angle of the second chamfer.

[0019] In one embodiment, the accumulator is provided with an oil filling hole, and the oil filling hole of the accumulator is connected to the oil inlet hole of the valve body through a first flow channel, wherein the aperture of the first flow channel is larger than the aperture of the oil filling hole.

[0020] In one embodiment, the oil outlet hole is directly connected to the oil cylinder; or, the filling valve structure includes a second flow channel, and the oil outlet hole is indirectly connected to the oil cylinder through the second flow channel.

[0021] The technical solution of the present invention is to configure the interior of the valve body into independent oil delivery chambers and driving chambers, and use the oil delivery chamber as the flow space of the hydraulic oil. During operation, the hydraulic oil flows out of the accumulator and passes through the oil inlet hole, the oil delivery chamber and the oil outlet hole in sequence and finally flows to the oil cylinder; at the same time, a piston member is arranged in the driving chamber of the valve body, and the driving chamber is divided into a first chamber and a second chamber that are independent of each other by the piston member. When the piston member is located in the driving chamber and slides, the spatial volumes of the first chamber and the second chamber change, thereby causing the internal pressure of the second chamber to change accordingly; wherein the piston member and the valve core member are connected to each other to ensure that the movement of the piston member can drive the valve core member to move accordingly.

[0022] When the filling valve is closed to stop the oil filling operation to the oil cylinder, the oil circuit drive assembly is used to inject the driving oil into the first chamber. As the volume of the first chamber increases due to the injection of driving oil, the piston member is pushed to move toward the second chamber; the piston member then drives the valve core member to move closer to the oil inlet hole to close the oil inlet hole, thereby isolating the connection between the oil inlet hole and the oil outlet hole. Since the above-mentioned filling valve closing process is controlled by the oil circuit drive assembly, it does not need to rely on adjusting the pressure difference between the accumulator and the oil cylinder, that is, it is an active closing; the active closing method can achieve a fast response closing to reduce the waiting lag time.

[0023] When the filling valve is opened to fill the oil cylinder with oil, the oil circuit drive component is used to discharge the drive oil from the first chamber. At this time, the internal pressure of the first chamber is reduced due to the discharge of the drive oil, so that the internal pressure of the second chamber is greater than the internal pressure of the first chamber, and the pressure difference between the first chamber and the second chamber is used to push the piston member to move toward the first chamber; the piston member then drives the valve core member to move away from the oil inlet hole to open the oil inlet hole, so that the oil inlet hole and the oil outlet hole are connected to each other, and the movement speed of the valve core member at this time is defined as the first speed; at the same time, when the valve core member is driven by the pressure of the accumulator to move away from the oil inlet hole to open the oil inlet hole, the movement speed of the valve core member at this time is defined as the second speed; wherein the first speed is slower than the second speed. That is, compared with the prior art method of using the pressure of the accumulator to drive the movement of the valve core member, the present application drives the movement of the valve core member by discharging the driving oil from the first chamber. The movement of the valve core member away from the oil inlet hole is slower, that is, the opening speed of the filling valve is slow, so that the hydraulic oil can be slowly injected into the cylinder to reduce the flow impact on the rear chamber of the cylinder and avoid affecting the smoothness of the cylinder movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram of the overall structure of an embodiment of a liquid filling valve structure provided by the present invention; Figure 2 for Figure 1 A partial enlarged view of the middle A; Figure 3 A schematic diagram of the structure of the valve body in an embodiment of the liquid filling valve structure provided by the present invention (the liquid filling valve is in an open state); Figure 4 A schematic diagram of the structure of the valve body in an embodiment of the liquid filling valve structure provided by the present invention (the liquid filling valve is in an actively closed state); Figure 5 This is a schematic structural diagram of the valve body in an embodiment of the liquid filling valve structure provided by the present invention (the liquid filling valve is in a passive closed state).

[0026] Description of reference numerals: 100, valve body; 110, oil inlet hole; 120, oil outlet hole; 130, valve body; 140, valve body base; 150, drive oil hole; 160, guide sleeve; 161, guide hole; 162, second groove; 163, second sealing ring; 170, valve seat ring; 200, oil delivery chamber; 300, drive chamber; 310, first chamber; 320, second chamber; 400, valve core member; 410, valve core inner cavity; 420, valve core spring; 43 0, oil hole; 440, third groove; 500, piston member; 510, piston inner cavity; 520, piston spring; 530, first groove; 600, oil circuit drive assembly; 610, drive oil control device; 620, throttling device; 630, one-way valve; 700, accumulator; 710, oil filling hole; 800, oil cylinder; 810, pressure sensor; 820, displacement sensor; 910, controller; 920, first flow channel; 930, second flow channel; The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solution in the present invention. Obviously, what is described is only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, it should be noted that the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] In the prior art, since the hydraulic oil will be quickly injected into the cylinder when the filling valve is filling the cylinder, this process will produce a flow impact on the rear chamber of the cylinder, thereby affecting the smoothness of the cylinder movement; at the same time, the closing of the filling valve is achieved by adjusting the pressure difference between the accumulator and the cylinder, that is, the closing of the filling valve is passive, and the passive closing method will cause a certain waiting lag time when the filling valve is closed, that is, the filling valve cannot respond quickly to closing.

[0031] In order to solve the above technical problems, the present invention proposes a liquid filling valve structure.

[0032] See also Figure 1-4 In one embodiment of the present invention, the filling valve structure includes: The valve body 100 has an oil delivery chamber 200 and a driving chamber 300 which are independent of each other, and the oil delivery chamber 200 is used as a flow space for hydraulic oil; the oil delivery chamber 200 is connected with an oil inlet hole 110 and an oil outlet hole 120, wherein the oil inlet hole 110 is used to communicate with the accumulator 700, and the oil outlet hole 120 is used to communicate with the oil cylinder 800; A valve core member 400, the valve core member 400 is slidably connected in the oil delivery chamber 200; The piston member 500 is slidably connected to the driving chamber 300; the piston member 500 divides the driving chamber 300 into a first chamber 310 and a second chamber 320 which are independent of each other, wherein the first chamber 310 is located at a side of the second chamber 320 away from the oil delivery chamber 200; the piston member 500 is connected to the valve core member 400; The oil circuit driving assembly 600 is used to inject or discharge driving oil into the first chamber 310; When the oil circuit driving assembly 600 injects driving oil into the first chamber 310, the piston member 500 moves toward the second chamber 320 and drives the valve core member 400 to move toward the oil inlet hole 110 to close the oil inlet hole 110. When the oil circuit drive assembly 600 performs the discharge operation of the driving oil to the first chamber 310, the piston member 500 moves toward the first chamber 310, and drives the valve core member 400 to move away from the oil inlet hole 110 to open the oil inlet hole 110, and the movement speed of the valve core member 400 at this time is defined as a first speed; at the same time, when the valve core member 400 is driven by the pressure of the accumulator 700 to move away from the oil inlet hole 110 to open the oil inlet hole 110, the movement speed of the valve core member 400 at this time is defined as a second speed; wherein the first speed is slower than the second speed.

[0033] The technical solution of the present invention is to set the interior of the valve body 100 into an independent oil delivery chamber 200 and a driving chamber 300, and use the oil delivery chamber 200 as the flow space of the hydraulic oil. During operation, the hydraulic oil flows out of the accumulator 700 and passes through the oil inlet hole 110, the oil delivery chamber 200 and the oil outlet hole 120 in sequence and finally flows to the oil cylinder 800; at the same time, a piston member 500 is set in the driving chamber 300 of the valve body 100, and the driving chamber 300 is divided into a first chamber 310 and a second chamber 320 that are independent of each other. When the piston member 500 is located in the driving chamber 300 and slides, the spatial volumes of the first chamber 310 and the second chamber 320 change, thereby causing the internal pressure of the second chamber 320 to change accordingly; at the same time, the piston member 500 is connected to the valve core member 400 to ensure that the piston member 500 can drive the valve core member 400 to move while moving.

[0034] Reference Figure 4 When the filling valve is closed to stop the oil injection operation to the oil cylinder 800, the oil circuit drive assembly 600 is used to inject the driving oil into the first chamber 310. Since the volume of the first chamber 310 increases due to the injection of driving oil, the piston member 500 is pushed to move toward the second chamber 320; the piston member 500 then drives the valve core member 400 to move closer to the oil inlet hole 110 to close the oil inlet hole 110, thereby isolating the connection between the oil inlet hole 110 and the oil outlet hole 120. Since the above-mentioned filling valve closing process is controlled by the oil circuit drive assembly 600, it does not need to rely on adjusting the pressure difference between the accumulator 700 and the oil cylinder 800, that is, it is an active closing; the active closing method can achieve a fast response closing to reduce the waiting delay time.

[0035] Reference Figure 3When the filling valve is opened to fill the oil cylinder 800 with oil, the oil circuit driving assembly 600 is used to discharge the driving oil from the first chamber 310. At this time, the internal pressure of the first chamber 310 is reduced due to the discharge of the driving oil, so that the internal pressure of the second chamber 320 is greater than the internal pressure of the first chamber 310. The pressure difference between the first chamber 310 and the second chamber 320 is used to push the piston member 500 to move toward the first chamber 310; the piston member 500 then drives the valve core member 400 to move away from the oil inlet hole 110 to open the oil inlet hole 110, so that the oil inlet hole 110 and the oil outlet hole 120 are connected to each other, and the movement speed of the valve core member 400 at this time is defined as the first speed; at the same time, when the valve core member 400 is driven by the pressure of the accumulator 700 to move away from the oil inlet hole 110 to open the oil inlet hole 110, the movement speed of the valve core member 400 at this time is defined as the second speed; wherein the first speed is slower than the second speed. That is, compared with the prior art method of using the pressure of the accumulator 700 to drive the movement of the valve core member 400, the present application drives the movement of the valve core member 400 by discharging the driving oil from the first chamber 310. The movement of the valve core member 400 away from the oil inlet hole 110 is slower, that is, the opening speed of the filling valve is slow, so that the hydraulic oil can be slowly injected into the cylinder 800 to reduce the flow impact on the rear cavity of the cylinder 800 and avoid affecting the smoothness of the movement of the cylinder 800.

[0036] It can be understood that in order to ensure that the first speed is slower than the second speed, this can be achieved by controlling the driving oil discharge power of the oil circuit drive component 600; specifically, by reducing the driving oil discharge power of the oil circuit drive component 600, the discharge operation of the driving oil from the first chamber 310 is slowed down, and then the movement of the valve core component 400 away from the oil inlet hole 110 is slowed down, so as to achieve the purpose of the first speed being slower than the second speed.

[0037] Among them, the second chamber 320 is equipped with a pressure regulating device (not shown in the drawings), which is used to adaptively adjust the internal pressure of the second chamber 320. In this way, it is mentioned above that when the oil circuit drive component 600 injects or discharges the driving oil into the first chamber 310, the spatial volume of the first chamber 310 will change. Since the overall spatial volume of the driving chamber 300 remains unchanged, when the spatial volume of the first chamber 310 changes, the spatial volume of the second chamber 320 will also change accordingly. In order to avoid the second chamber 320 causing its internal pressure to change due to the change in spatial volume, thereby affecting the displacement of the piston 500 between the first chamber 310 and the second chamber 320; in this embodiment, a pressure regulating device is configured in the second chamber 320, and the pressure regulating device is used to adaptively adjust the internal pressure of the second chamber 320, so as to ensure that the piston 500 can slide smoothly between the first chamber 310 and the second chamber 320. The regulating medium of the pressure regulating device can be selected as gas or liquid, and this application does not impose specific restrictions on it.

[0038] Specifically, refer to the attached Figure 1 The valve body 100 includes a valve body 130 and a valve body base 140, and the valve body 130 and the valve body base 140 are detachably sealed; the oil inlet 110 and the oil outlet 120 are arranged on the valve body 130; the valve body base 140 is provided with a driving oil hole 150, and the oil circuit driving assembly 600 is connected to the first chamber 310 through the driving oil hole 150. In this way, the valve body 100 is arranged to be composed of the valve body 130 and the valve body base 140, so that the valve core 400, the piston 500 and the guide sleeve 160 and other parts can be assembled into the interior thereof; at the same time, it is convenient to repair and clean the interior of the valve body 100.

[0039] Among them, refer to the attached Figure 1 There are many specific structures of the oil circuit drive component 600. In the present embodiment, the oil circuit drive component 600 includes a drive oil control device 610, which is used to inject or discharge the drive oil into or out of the first chamber 310. With this arrangement, the drive oil control device 610 is used as a mobile power source for the drive oil to inject or discharge the drive oil into or out of the first chamber 310, thereby ensuring the smooth implementation of the technical solution of the present application, and the structure is simple and practical.

[0040] Furthermore, the oil circuit drive assembly 600 further includes a throttling device 620, the two ends of which are respectively connected to the first chamber 310 and the driving oil control device 610; wherein the throttling device 620 is used to measure the flow rate of the driving oil; in this way, the throttling device 620 is also called a throttling flowmeter, which generates a static pressure difference by increasing the flow rate and reducing the static pressure, and is used to measure the fluid flow rate. In this embodiment, the throttling device 620 is arranged between the first chamber 310 and the driving oil control device 610 to effectively measure the flow rate of the driving oil injected into or discharged from the first chamber 310, which helps to accurately control the opening and closing degree of the filling valve.

[0041] Furthermore, the oil circuit drive assembly 600 also includes a one-way valve 630, which is arranged in parallel with the throttling device 620; the passage direction of the one-way valve 630 points to the driving oil control device 610. With such an arrangement, compared with studying the discharge amount of the driving oil, studying the injection amount of the driving oil can be more helpful in accurately controlling the opening and closing degree of the filling valve; therefore, the one-way valve 630 and the throttling device 620 are designed to be a parallel structure, when the driving oil is discharged, the driving oil can flow to the driving oil control device 610 through the throttling device 620 and the branch where the one-way valve 630 is located; when the driving oil is injected, the driving oil can only flow to the driving oil control device 610 through the branch where the throttling device 620 is located, and the flow value measured by the throttling device 620 is the injection amount of the driving oil.

[0042] Further, the oil cylinder 800 is provided with a pressure sensor 810 and / or a displacement sensor 820, and the pressure sensor 810 and / or the displacement sensor 820 are electrically connected to the driving oil control device 610 through the controller 910. In this way, the pressure sensor outputs pressure feedback, and the displacement sensor outputs displacement feedback. When the pressure feedback value or the displacement feedback value of the oil cylinder 800 reaches a preset value, the driving oil control device 610 is used to timely drive the valve core member 400 to perform a closing operation to avoid damage to the oil cylinder 800 due to excessive pressure or excessive displacement. The controller 910 can adopt a common PLC controller, and by internally programming the PLC controller, it drives the driving oil control device 610 to operate when the pressure value or the displacement value of the oil cylinder 800 reaches a preset value. Since the PLC controller belongs to the prior art, this application will not elaborate on its structural principle in detail.

[0043] As a preferred solution of the above embodiment, a piston inner cavity 510 is provided inside the piston member 500, and a piston spring 520 is provided inside the piston inner cavity 510, and the two ends of the piston spring 520 are connected to the piston member 500 and the first chamber 310 respectively; wherein the direction of the elastic force of the piston spring 520 is in the direction away from the oil inlet hole 110. In this way, in this embodiment, the piston spring 520 is provided in the piston inner cavity 510 of the piston member 500, and when the driving oil is discharged from the first chamber 310, the elastic force of the piston spring 520 will drive the piston member 500 to move in the direction away from the oil inlet hole 110, that is, drive the piston member 500 to move in the direction of the first chamber; in this way, under the dual action of the pressure difference between the first chamber 310 and the second chamber 320 and the piston spring 520, the piston member 500 can indeed move in the direction of the first chamber 310, so that the valve core member 400 can open the oil inlet hole 110, ensuring the smooth implementation of the technical solution of the present application.

[0044] Furthermore, a first groove 530 is provided in an annular manner on the outer side of the piston member 500, and a first sealing ring (not shown in the drawings) is installed in the first groove 530, and the first sealing ring is sealed and fitted with the inner side of the driving chamber 300. In this arrangement, the sealing effect of the first sealing ring ensures that the first chamber 310 and the second chamber 320 are independent of each other, and prevents the driving oil from flowing from the gap between the piston member 500 and the valve body 100 into the second chamber 320, resulting in leakage of the driving oil.

[0045] As a preferred solution of the above embodiment, refer to the attached Figure 5 , a valve core cavity 410 is arranged inside the valve core part 400, a valve core spring 420 is arranged inside the valve core cavity 410, and the two ends of the valve core spring 420 are connected to the valve core part 400 and the piston part 500 respectively; wherein the direction of the elastic force of the valve core spring 420 is in the direction away from the oil inlet hole 110. In this way, by arranging the valve core spring 420 in the valve core cavity 410 of the valve core part 400, the passive closing of the filling valve is realized. It can be understood that when the pressure value of the accumulator 700 is lower than the pressure value of the oil cylinder 800, a negative pressure difference is formed inside the accumulator 700, and the pressure difference will drive the valve core part 400 to overcome the elastic force of the valve core spring 420 relative to the valve body 100 and close the oil inlet hole 110, thereby achieving the purpose of passive closing. That is to say, the filling valve of the present application can realize active closing and passive closing at the same time, so as to more effectively adapt to various operating scenarios and improve applicability.

[0046] Furthermore, a plurality of oil holes 430 are provided on the side of the valve core member 400, and the oil holes 430 are connected to the oil delivery chamber 200 and the valve core inner cavity 410. Such a configuration is provided to avoid the valve core inner cavity 410 from forming a vacuum state due to sealing, thereby causing obstruction to the passive closing of the valve core member 400; in this embodiment, a plurality of oil holes 430 are provided on the side of the valve core member 400, and the internal pressure of the valve core inner cavity 410 is basically consistent with the external pressure of the valve core member 400 through the oil holes 430, so as to avoid the valve core inner cavity 410 from forming a vacuum state due to sealing, and ensure that the valve core member 400 can move smoothly when it is passively closed.

[0047] As a preferred solution of the above embodiment, a guide sleeve 160 is fixedly arranged inside the valve body 100, and the guide sleeve 160 is located between the oil delivery chamber 200 and the drive chamber 300; a guide hole 161 is provided through the middle of the guide sleeve 160, and at least part of the valve core member 400 and at least part of the piston member 500 are slidably connected in the guide hole 161. In this way, through the guiding effect of the guide sleeve 160, it is ensured that the valve core member 400 and the piston member 500 can move and slide along a preset path when moving and sliding.

[0048] Furthermore, the outer side of the guide sleeve 160 is provided with a second groove 162 in an annular manner, and the second groove 162 is provided with a second sealing ring 163, and the second sealing ring 163 is used to seal and fit with the inner side of the valve body 100. In this way, the sealing effect of the second sealing ring 163 ensures that the oil delivery chamber 200 and the second chamber 320 are independent of each other, and prevents the hydraulic oil from flowing from the gap between the guide sleeve 160 and the valve body 100 into the second chamber 320, resulting in leakage of the hydraulic oil.

[0049] Furthermore, a plurality of third grooves 440 are provided in an annular manner on the outer side of the valve core member 400 and / or the piston member 500, and the plurality of third grooves 440 are distributed at intervals along the axis of the guide hole 161. When the valve core member 400 and the piston member 500 slide along the guide sleeve 160 to the oil delivery chamber 200, part of the hydraulic oil adheres to the third grooves 440 of the valve core member 400 and / or the piston member 500. Since the hydraulic oil has lubricating properties, it can be used as a lubricant between the valve core member 400 and the piston member 500 and the guide sleeve 160, thereby ensuring that the valve core member 400 and the piston member 500 can move smoothly when sliding relative to the guide sleeve 160.

[0050] As a preferred solution of the above embodiment, a valve seat ring 170 with an annular structure is installed at the oil inlet hole 110. When the valve core member 400 closes the oil inlet hole 110, the valve core member 400 and the valve seat ring 170 contact each other; and the end of the valve core member 400 for contacting the valve seat ring 170 is provided with a first chamfer, and the end of the valve seat ring 170 for contacting the valve core member 400 is provided with a second chamfer, and the inclination angle of the first chamfer is smaller than the inclination angle of the second chamfer. In this way, by setting the first chamfer and the second chamfer to have different inclination angles, on the premise of ensuring that the valve core member 400 and the valve seat ring 170 are in contact and connected with each other to ensure that the oil inlet hole 110 is closed, it is avoided that the valve core member 400 and the valve seat ring 170 are stuck to each other due to friction and other reasons, making it difficult to separate the two.

[0051] As a preferred solution of the above embodiment, the accumulator 700 is provided with an oil filling hole 710, and the oil filling hole 710 of the accumulator 700 is connected to the oil inlet hole 110 of the valve body 100 through the first flow channel 920, wherein the aperture of the first flow channel 920 is larger than the aperture of the oil filling hole 710. In such a configuration, it is considered that if the aperture of the first flow channel 920 is too small, the hydraulic oil cannot flow smoothly from the accumulator 700 to the filling valve; based on the above considerations, the aperture of the first flow channel 920 is specifically specified in this embodiment to ensure that the hydraulic oil can flow smoothly from the accumulator 700 to the filling valve. In this embodiment, the aperture of the first flow channel 920 is more than 1.2 times the aperture of the oil filling hole 710.

[0052] As a preferred solution of the above embodiment, the oil outlet hole 120 is directly connected to the oil cylinder 800; or, the filling valve structure includes a second flow channel 930, and the oil outlet hole 120 and the oil cylinder 800 are indirectly connected via the second flow channel 930; this arrangement allows operators to select a suitable connection method for the oil outlet hole 120 and the oil cylinder 800 according to actual on-site conditions, which helps to improve applicability.

[0053] It should be noted that other contents of the filling valve structure disclosed in the present invention are prior art and will not be described in detail here.

[0054] The above are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any direct / indirect application of the present invention in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A filling valve structure, characterized in that: The filling valve structure comprises: A valve body, wherein the valve body is provided with an independent oil delivery chamber and a drive chamber, wherein the oil delivery chamber is used as a flow space for hydraulic oil; the oil delivery chamber is connected with an oil inlet hole and an oil outlet hole, wherein the oil inlet hole is used to communicate with the energy accumulator, and the oil outlet hole is used to communicate with the oil cylinder; A valve core member, the valve core member being slidably connected in the oil delivery chamber; A piston member, the piston member is slidably connected to the driving chamber; the piston member divides the driving chamber into a first chamber and a second chamber that are independent of each other, wherein the first chamber is located on a side of the second chamber away from the oil delivery chamber; the piston member is connected to the valve core member; An oil circuit drive assembly, the oil circuit drive assembly is used to inject or discharge drive oil into the first chamber; When the oil circuit driving component performs the injection operation of the driving oil into the first chamber, the piston moves toward the second chamber and drives the valve core to move toward the oil inlet hole to close the oil inlet hole; When the oil circuit driving component performs the discharge operation of the driving oil to the first chamber, the piston member moves toward the first chamber and drives the valve core member to move away from the oil inlet hole to open the oil inlet hole, and the movement speed of the valve core member at this time is defined as a first speed; at the same time, when the valve core member is driven by the pressure of the accumulator to move away from the oil inlet hole to open the oil inlet hole, the movement speed of the valve core member at this time is defined as a second speed; wherein the first speed is slower than the second speed.

2. The liquid filling valve structure according to claim 1, characterized in that: The valve body includes a valve body part and a valve body base, and the valve body part and the valve body base are detachably sealed and connected; the oil inlet hole and the oil outlet hole are arranged on the valve body part; the valve body base is provided with a driving oil hole, and the oil circuit driving component is connected to the first chamber through the driving oil hole.

3. The liquid filling valve structure according to claim 1, characterized in that: The oil circuit drive assembly includes a drive oil control device, and the drive oil control device is used to inject or discharge the drive oil into the first chamber; Furthermore, the oil circuit drive assembly further comprises a throttling device, the two ends of which are respectively connected to the first chamber and the drive oil control device; wherein the throttling device is used to measure the flow rate of the drive oil; Furthermore, the oil circuit drive assembly further comprises a one-way valve, which is arranged in parallel with the throttling device; the passage direction of the one-way valve points to the drive oil control device.

4. The liquid filling valve structure according to claim 3, characterized in that: The oil cylinder is provided with a pressure sensor and / or a displacement sensor, and the pressure sensor and / or the displacement sensor is electrically connected to the driving oil control device through a controller.

5. The liquid filling valve structure according to claim 1, characterized in that: The piston member is provided with a piston inner cavity inside, and a piston spring is provided inside the piston inner cavity, and two ends of the piston spring are respectively connected to the piston member and the first chamber; wherein the elastic force direction of the piston spring is toward the direction away from the oil inlet hole.

6. The liquid filling valve structure according to claim 5, characterized in that: The outer side of the piston is provided with a first groove in an annular shape, and a first sealing ring is installed in the first groove. The first sealing ring is sealed and fitted with the inner side of the driving chamber.

7. The liquid filling valve structure according to claim 1, characterized in that: A valve core cavity is arranged inside the valve core component, a valve core spring is arranged inside the valve core cavity, and two ends of the valve core spring are respectively connected to the valve core component and the piston component; wherein the elastic force direction of the valve core spring is toward the direction away from the oil inlet hole.

8. The liquid filling valve structure according to claim 7, characterized in that: A plurality of oil through holes are formed on the side of the valve core member, and the oil through holes are connected with the oil delivery chamber and the inner cavity of the valve core.

9. The liquid filling valve structure according to claim 1, characterized in that: A guide sleeve is fixedly arranged inside the valve body, and the guide sleeve is located between the oil delivery chamber and the drive chamber; a guide hole is arranged through the middle of the guide sleeve, and at least part of the valve core member and at least part of the piston member are slidably connected in the guide hole.

10. The liquid filling valve structure according to claim 9, characterized in that: The outer side of the guide sleeve is provided with a second groove in an annular shape, and a second sealing ring is installed in the second groove. The second sealing ring is sealed and fitted with the inner side of the valve body.

11. The liquid filling valve structure according to claim 9, characterized in that: A plurality of third grooves are annularly arranged on the outer side of the valve core member and / or the piston member, and the plurality of third grooves are distributed at intervals along the axis of the guide hole.

12. The liquid filling valve structure according to claim 1, characterized in that: A valve seat ring with an annular structure is installed at the oil inlet hole, and when the valve core member closes the oil inlet hole, the valve core member and the valve seat ring are in contact with each other; Furthermore, the end of the valve core member for contacting the valve seat ring is provided with a first chamfer, and the end of the valve seat ring for contacting the valve core member is provided with a second chamfer, and the inclination angle of the first chamfer is smaller than the inclination angle of the second chamfer.

13. The liquid filling valve structure according to claim 1, characterized in that: The energy accumulator is provided with an oil filling hole, and the oil filling hole of the energy accumulator is communicated with the oil inlet hole of the valve body through a first flow channel, wherein the aperture of the first flow channel is larger than the aperture of the oil filling hole.

14. The liquid filling valve structure according to claim 1, characterized in that: The oil outlet hole is directly connected to the oil cylinder; or, the filling valve structure includes a second flow channel, and the oil outlet hole is indirectly connected to the oil cylinder through the second flow channel.

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