A new structure of an electric control valve

Abstract

The present invention discloses a novel structure of an electric control valve, which includes a housing, a regulating shaft, a rotary drive assembly, a base, a cartridge valve and a limiting ejector rod. A first chamber is formed between the regulating shaft and the housing. A second chamber is provided in the base, and a first oil inlet hole is provided on the side wall of the second chamber. A communicating oil passage is provided in the housing, and the communicating oil passage communicates the first chamber with the second chamber. A third chamber is formed between the limiting ejector rod and the regulating shaft, and a second oil inlet hole is provided on the side wall of the third chamber. The second oil inlet hole communicates the first chamber and the third chamber. The lower end of the limiting ejector rod passes through the second chamber and is inserted into the cartridge valve. The limiting ejector rod controls the maximum opening of the valve of the cartridge valve. The cooperation between the first shape and the second shape can limit the limiting ejector rod to move only linearly and not rotate. The upper and lower structural hydraulic balance of the control chamber of the cartridge valve is realized through the external circulation of the communicating oil passage, preventing some components from being damaged by dry friction, so as to achieve the purpose of reducing the regulating resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic valves, and particularly to a novel structure of an electric regulating valve. Background Art

[0002] Currently, in the die-casting machine and injection molding machine industries, the opening limit adjustment structure of the cartridge valve includes manual adjustment and electric adjustment. The main structure of the manual adjustment is as follows: the handwheel is connected to the adjustment push rod, the adjustment push rod is threadedly connected to the cartridge valve cover, and one end of the adjustment push rod is inserted into the control cavity of the valve core. By manually rotating the handwheel to drive the adjustment push rod to move forward or backward, the opening of the valve core is restricted. The manual adjustment structure is simple. Only a part of the limit push rod is immersed in the hydraulic cavity communicated with the control cavity of the cartridge valve core, and the hydraulic pressure received is not completely balanced. Therefore, when the oil pressure in the control cavity of the cartridge valve is relatively high, a large axial force is borne on the push rod, and this axial force directly acts on the threaded pair for transmission, resulting in an increase in the rotational resistance of the limit push rod, and the threaded transmission pair is prone to wear and jamming; moreover, the control accuracy is low, and the cartridge valve cannot achieve automatic adjustment.

[0003] Chinese invention patent CN103644365B discloses an electric regulating valve, specifically discloses an opening limit adjustment device for a cartridge valve, which mainly includes a driving structure fixedly connected to one end of the main shaft, the other end of the main shaft is connected to one end of the limit push rod through a threaded transmission pair, and the other end of the limit push rod is inserted into the control cavity of the valve core. By driving the limit push rod to move back and forth through the driving structure, the opening of the valve core is restricted.

[0004] However, during the process of implementing the technical solutions in the embodiments of the present invention by the inventors of the present application, it is found that the above-mentioned prior art has at least the following technical problems:

[0005] (1) Since the existing electric regulating valve opens a communicating oil passage on the limit push rod to communicate the upper and lower parts of the control cavity of the cartridge valve, when the limit push rod rotates to the top, it is found that the oil passage opening of the communicating oil passage completely enters the upper main shaft adjustment cavity, resulting in the inability of the hydraulic oil to achieve hydraulic balance through the communicating oil passage on the limit push rod, and the situation that the motor cannot drive the limit push rod, and finally the motor is stuck and burned out; moreover, in some places where the space gap of this structure is very small, there is no obvious communicating oil passage, and the oil cannot flow smoothly up and down, and the hydraulic oil cannot completely immerse all parts, causing some parts to be dry-ground and damaged, and the resistance increases, resulting in the phenomenon of motor jamming.

[0006] (2) Since a communicating oil passage is opened on the existing limit push rod, when the valve core impacts the limit push rod, the impact is relatively large, and it is easy to cause the limit push rod to break from the oil passage opening; in actual application, the fracture situation at this place is very serious.

[0007] (3) The anti-rotation device between the limit ejector rod and the housing is an anti-rotation pin. This structure is prone to deformation and has a large gap with the housing. Once the anti-rotation pin is deformed, the resistance increases, easily causing the motor to jam. In actual applications, the deformation and jamming phenomenon here is very serious. Moreover, due to the large gap between the anti-rotation pin and the housing, the anti-rotation pin is prone to deformation, and the control accuracy of the valve core opening is very low.

[0008] (4) The mounting bracket of the drive mechanism is not shock-absorbed. During actual use, the machine vibrates very strongly and is very likely to damage the drive mechanism.

[0009] (5) The drive structure is directly and rigidly connected to the main shaft and cannot play a role in buffering and shock absorption. When the machine vibrates and the valve core hits the limit ejector rod, the vibration will be transmitted to the drive structure. Moreover, when the mechanical structure is not concentric, the drive structure is rigidly connected to the main shaft and cannot effectively compensate for the relative displacement of the two shafts, resulting in the motor being stuck. Summary of the Invention

[0010] The purpose of the present invention is to provide a new type of electric control valve structure to solve the technical problem in the prior art that when a through-oil passage is opened on the limit ejector rod and the limit ejector rod rotates to the top, the hydraulic oil cannot achieve hydraulic balance through the through-oil passage on the limit ejector rod.

[0011] To achieve the above purpose, the technical solution of the present invention provides a new type of electric control valve structure, including:

[0012] A housing;

[0013] A regulating shaft, the regulating shaft is rotatably connected in the housing, and a first chamber is formed between the regulating shaft and the housing;

[0014] A rotary drive assembly, the rotary drive assembly is arranged on the housing, and the rotary drive assembly is used to drive the regulating shaft to rotate;

[0015] A base, the base is arranged at the bottom of the housing, and a second chamber is opened in the base. A first oil inlet hole is opened on the side wall of the second chamber, and a through-oil passage is opened in the housing. The through-oil passage is used to communicate the first chamber and the second chamber;

[0016] An inserted valve, the inserted valve is arranged at the bottom of the base; and

[0017] A limiting ejector rod, the upper end of the limiting ejector rod is threadedly connected to the adjusting shaft, and a third chamber is formed between the limiting ejector rod and the adjusting shaft. A second oil inlet hole is provided on the side wall of the third chamber, and the second oil inlet hole is used to communicate the first chamber and the third chamber. The lower end of the limiting ejector rod passes through the second chamber and is inserted into the cartridge valve, and the limiting ejector rod is used to control the maximum opening of the valve of the cartridge valve. The cross section of the limiting ejector rod is of a first shape, and the cross section of the second chamber is of a second shape, and the second shape and the first shape cooperate to limit the limiting ejector rod to move only linearly and not rotate.

[0018] Optionally, the rotary drive assembly includes:

[0019] A shock-absorbing bracket, the shock-absorbing bracket is arranged on the top of the housing;

[0020] A motor, the motor is arranged on the shock-absorbing bracket; and

[0021] A coupling, the coupling connects the rotating shaft of the motor and the adjusting shaft.

[0022] Optionally, the motor is a servo motor with an absolute encoder.

[0023] Optionally, the coupling is a polygonal rubber coupling.

[0024] Optionally, the outer circumferential surface of the upper end of the adjusting shaft is connected to the inner circumferential surface of the housing through a first bearing, and the outer circumferential surface of the lower end of the adjusting shaft is connected to the inner circumferential surface of the housing through a second bearing.

[0025] Optionally, a flange is provided on the outer circumferential surface of the adjusting shaft, a step is provided on the inner circumferential surface of the housing, and a plain bearing is provided between the flange and the step.

[0026] Optionally, the adjusting shaft is a hollow shaft, an internal thread is provided on the inner circumferential surface of the hollow shaft, an external thread with a reinforced structure is provided on the outer circumferential surface of the upper end of the limiting ejector rod, and it naturally transitions from the lower end of the external thread to the upper end surface of the limiting ejector rod. The upper end of the limiting ejector rod is threadedly connected to the adjusting shaft by screwing into the adjusting shaft.

[0027] Optionally, a cross slot is provided at the top of the limiting ejector rod.

[0028] Optionally, the first shape is selected from one of a rectangle, a kidney shape, a semi-kidney shape, an oval shape, a semi-oval shape, a kidney arc shape, a semi-kidney arc shape, an olive shape, and a semi-olive shape, and the second shape is selected from one of a rectangle, a kidney shape, a semi-kidney shape, an oval shape, a semi-oval shape, a kidney arc shape, a semi-kidney arc shape, an olive shape, and a semi-olive shape. Moreover, the cooperation between the second shape and the first shape can limit the limiting ejector rod to only move linearly and not rotate.

[0029] Optionally, the cartridge valve includes:

[0030] A valve sleeve, which is arranged at the bottom of the base. Moreover, an oil inlet is opened at the bottom of the valve sleeve, and oil outlets are respectively opened on both side surfaces of the valve sleeve;

[0031] A valve core, which is arranged inside the valve sleeve. Moreover, the valve core is used to control the connection or disconnection between the oil inlet and the oil outlets; and

[0032] An elastic member, which is sleeved on the lower end of the limiting ejector rod. Moreover, the lower end of the elastic member abuts against the valve core, and the upper end of the elastic member abuts against the bottom surface of the base.

[0033] In summary, by applying the technical solution of the electric control valve structure of the present invention, there are at least the following beneficial effects: The electric control valve structure opens a communicating oil passage on the side inner wall of the housing. The communicating oil passage connects the first chamber and the second chamber, and a second oil inlet hole is opened on the side wall of the third chamber. The second oil inlet hole connects the first chamber and the third chamber, so that the oil flow in the control chamber of the entire cartridge valve is smooth up and down. Through the external circulation of the communicating oil passage, the hydraulic balance of the upper and lower structures of the control chamber of the cartridge valve is realized. To ensure that internal parts such as the limiting ejector rod, the adjusting shaft, and the bearing are immersed in the hydraulic oil of the control chamber of the cartridge valve in all directions without dead ends, preventing dry grinding damage of some parts, thereby automatically achieving the purpose of hydraulic balance and reducing the adjustment resistance, avoiding the technical problem in the prior art that when a communicating oil passage is opened on the limiting ejector rod, when the limiting ejector rod rotates to the top, the hydraulic oil cannot pass through the communicating oil passage on the limiting ejector rod to achieve the upper and lower hydraulic balance, and preventing the situation that the motor is stuck and burned out because the motor cannot drive the limiting ejector rod due to unbalanced hydraulic pressure.

[0034] To make the concept of the present invention and other invention purposes, features, functions, and advantages more clearly understandable, preferred embodiments will be specifically cited in the following detailed description, and detailed explanations will be made in conjunction with the drawings. Description of the Drawings

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0036] Figure 1 is a schematic structural diagram of a novel electric control valve structure provided by an embodiment of the present invention;

[0037] Figure 2 is provided by an embodiment of the present invention Figure 2 a cross-sectional view of the A-A section;

[0038] Explanation of reference numerals: 10 - electric control valve structure, 100 - rotary drive assembly, 110 - shock-absorbing bracket, 120 - motor, 130 - coupling, 200 - housing, 210 - communicating oil passage, 220 - first chamber, 300 - adjusting shaft, 310 - third chamber, 320 - second oil inlet hole, 330 - flange, 400 - base, 410 - second chamber, 420 - first oil inlet hole, 500 - cartridge valve, 510 - valve sleeve, 511 - oil inlet, 512 - oil outlet, 520 - valve core, 530 - elastic member, 600 - limiting ejector rod, 610 - cross groove, 700 - gland, 800 - first bearing, 900 - second bearing, 1000 - plain bearing. Detailed implementation manners

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0040] In the present invention, for a clearer description, the following explanations are made: The terms "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. in the text indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present invention.

[0041] It should also be noted that, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation", "setting" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, the terms "first", "second", "third" are only used for the purpose of clear or simplified description, and cannot be understood as indicating or implying relative importance or quantity.

[0043] Please refer to Figures 1 to 2 , this embodiment provides a novel electric control valve structure 10, including a housing 200, a regulating shaft 300, a rotary drive assembly 100, a base 400, a cartridge valve 500 and a limit ejector rod 600. Among them, the regulating shaft 300 is rotatably connected inside the housing 200, and a first chamber 220 is formed between the regulating shaft 300 and the housing 200; the rotary drive assembly 100 is arranged on the housing 200, and the rotary drive assembly 100 is used to drive the regulating shaft 300 to rotate; the base 400 is arranged at the bottom of the housing 200 and is sleeved at the connection between the base 400 and the housing 200 through a gland 700, and a second chamber 410 is opened in the base 400, a first oil inlet hole 420 is opened on the side wall of the second chamber 410, a communicating oil passage 210 is opened in the housing 200, and the communicating oil passage 210 is used to communicate the first chamber 220 and the second chamber 410; the cartridge valve 500 is arranged at the bottom of the base 400; the upper end of the limit ejector rod 600 is threadedly connected to the regulating shaft 300, and a third chamber 310 is formed between the limit ejector rod 600 and the regulating shaft 300, a second oil inlet hole 320 is opened on the side wall of the third chamber 310, and the second oil inlet hole 320 is used to communicate the first chamber 220 and the third chamber 310. The lower end of the limit ejector rod 600 passes through the second chamber 410 and is inserted into the valve core 520 of the cartridge valve 500, and the limit ejector rod 600 is used to control the maximum opening of the valve of the cartridge valve 500; the cross section of the limit ejector rod 600 is of a first shape, the cross section of the second chamber 410 is of a second shape, and the second shape and the first shape cooperate to limit the limit ejector rod 600 to only move linearly and not rotate. Compared with the prior art, in this embodiment, the purpose of stopping rotation, guiding and translating the limit ejector rod 600 can be achieved through the self-shape structure of the limit ejector rod 600, which not only saves the cost of the anti-rotation pin but also increases the strength of the limit ejector rod 600.

[0044] Among them, the electric control valve structure 10 is configured by providing a through-oil passage 210 on the inner side wall of the housing 200. The through-oil passage 210 connects the first chamber 220 and the second chamber 410, and a second oil inlet hole 320 is provided on the side wall of the third chamber 310. The second oil inlet hole 320 connects the first chamber 220 and the third chamber 310, enabling smooth oil passage up and down in the control chamber of the entire cartridge valve 500. Through the external circulation of the through-oil passage 210, the hydraulic balance of the upper and lower structures of the control chamber of the cartridge valve 500 is achieved, ensuring that internal components such as the limit ejector rod 600, the adjusting shaft 300, and the bearings are fully immersed in the hydraulic oil in the control chamber of the cartridge valve 500 without dead angles, preventing dry grinding damage to some components, thereby automatically achieving hydraulic balance and reducing the adjustment resistance. This avoids the technical problem in the prior art where a through-oil passage 210 is provided on the limit ejector rod 600, and when the limit ejector rod 600 rotates to the top, the hydraulic oil cannot pass through the through-oil passage 210 on the limit ejector rod 600 to achieve upper and lower hydraulic balance, preventing the situation where the motor 120 is stuck and burned out due to unbalanced hydraulic pressure. Moreover, compared with the prior art, the electric control valve structure 10 in this embodiment does not require a through-oil passage 210 to be provided inside the limit ejector rod 600, ensuring the strength of the limit ejector rod 600 and solving the problem that the limit ejector rod 600 is prone to fracture when the impact force of the valve core 520 is relatively large, making it safer and more reliable to use.

[0045] It should be noted that during the implementation of the technical solution in the prior art by the inventors of the present application, it was found that there is a very important problem with the existing electric control valve structure 10, that is, the motor 120 is frequently stuck and unable to drive the adjusting shaft 300 to rotate, and even causes the motor 120 to be stuck and burned out. And those skilled in the art still do not clearly understand what exactly causes the motor 120 to be stuck and burned out. After many experiments and in-depth research by the inventors of the present application, it was found that the existing electric control valve structure 10 provides an oil passage on the limit ejector rod 600 to connect the upper and lower parts of the control chamber of the cartridge valve 500. When the limit ejector rod 600 rotates to the top, it is found that the oil passage port of this oil passage completely enters the adjustment cavity of the adjusting shaft 300, resulting in the inability of the hydraulic oil to flow into the oil passage and the adjusting shaft 300 through the oil passage port, thus unable to achieve hydraulic balance. Eventually, the situation where the motor cannot drive the limit ejector rod 600 occurs, which is also the root cause of the motor 120 being stuck and burned out. Moreover, in some places where the space gap of this structure is very small, there is no obvious oil passage, resulting in unsmooth oil passage up and down, and the hydraulic oil cannot completely immerse all components, causing dry grinding damage to some components, increasing the resistance, and also causing the motor 120 to be stuck.

[0046] In one embodiment, the rotary drive assembly 100 includes a shock-absorbing bracket 110, a motor 120 and a coupling 130, wherein the shock-absorbing bracket 110 is arranged on the top of the shell 200, and the motor 120 is arranged on the shock-absorbing bracket 110; the coupling 130 connects the rotating shaft of the motor 120 with the adjusting shaft 300, and the motor 120 drives the adjusting shaft 300 to rotate through the coupling 130. Since the adjusting shaft 300 and the limiting push rod 600 are connected by a threaded transmission pair, and the limiting push rod 600 is subject to the anti-rotation guide, the limiting push rod 600 can only move up and down in a straight line along its own axis, thereby controlling the maximum stroke of the valve core 520 in the valve sleeve 510, thereby controlling the maximum opening of the valve of the cartridge valve 500. The shock-absorbing bracket 110 adopts a shock-absorbing alloy bracket, and the shock-absorbing bracket 110 is installed on the top of the shell 200 by fasteners. When the valve core 520 is affected by the hydraulic pressure and hits the lower end of the limit push rod 600 upward, the shock-absorbing bracket 110 absorbs the vibration transmitted through the limit push rod 600 and the adjusting shaft 300 in sequence, thereby avoiding the vibration from being transmitted to the motor and causing damage to the motor 120. The shock-absorbing bracket 110 plays a shock-absorbing role, prevents the motor 120 from being damaged, and extends the service life of the motor 120.

[0047] Specifically, the motor 120 adopts a servo motor 120 with an absolute encoder. This servo motor 120 with an absolute encoder has good control accuracy, good overload resistance, can realize closed-loop control, can frequently rotate forward and reverse, has a long service life, and can remember the current working position in the event of a power outage without the need to reset to zero.

[0048] Furthermore, the coupling 130 adopts a polygonal rubber coupling 130, which is a hexagonal or octagonal elastic member made of rubber material with a circular cross-section. A sleeve bonded to the rubber after vulcanization is embedded in each place, and 6 or 8 bolts passing through the sleeve are staggered to connect with the half-coupling flanges on the master and slave ends. The polygonal rubber coupling has a simple structure, does not require lubrication, is easy to assemble and disassemble, and has the function of alleviating torsional vibration and impact load of the transmission shaft system. The most critical thing is that the polygonal rubber coupling 130 can prevent the transmission shaft system from resonating and can compensate for the relative offset of the two axes. That is to say, the polygonal rubber coupling 130 can effectively compensate for the relative displacement between the rotating shaft of the motor 120 and the adjusting shaft 300, solves the problem of non-concentricity caused by processing and assembly errors in this part of the structure, and can further play a role in buffering and shock absorption.

[0049] In one embodiment, the outer circumferential surface of the upper end of the adjusting shaft 300 is connected to the inner circumferential surface of the housing 200 through a first bearing 800, and the outer circumferential surface of the lower end of the adjusting shaft 300 is connected to the inner circumferential surface of the housing 200 through a second bearing 900. The adjusting shaft 300 is rotationally connected to the housing 200 through the first bearing 800 and the second bearing 900. Since the communicating oil passage 210 connects the first chamber 220 and the second chamber 410, the oil flow in the control chamber of the entire cartridge valve 500 is smooth up and down. The hydraulic balance of the upper and lower structures of the control chamber of the cartridge valve 500 is achieved through the external circulating communicating oil passage, ensuring that the first bearing 800 and the second bearing 900 are immersed in the hydraulic oil in the third chamber 310, preventing the first bearing 800 and the second bearing 900 from being damaged by dry grinding, thereby achieving the purpose of reducing the adjustment resistance, avoiding the motor 120 from being stuck and burned out, and having a high safety factor in use.

[0050] Specifically, a flange 330 is provided on the outer circumferential surface of the adjusting shaft 300, a step is provided on the inner circumferential surface of the housing 200, and a plain bearing 1000 is provided between the flange 330 and the step. The two sides of the plain bearing 1000 are axially positioned through the flange 330 and the step respectively. The main function of using this plain bearing 1000 is to bear the axial load and avoid the axial force generated by the valve core 520 hitting the limit ejector rod 600 from causing axial displacement of the adjusting shaft 300, which affects the control accuracy of the cartridge valve 500. Moreover, this plain bearing 1000 can also prevent the thread teeth meshing between the limit ejector rod 600 and the adjusting shaft 300 from being severely worn and stuck due to excessive axial force, and further causing the motor 120 to be unable to drive the adjusting shaft 300 to rotate and be stuck and burned out.

[0051] In one embodiment, the adjusting shaft 300 is a hollow shaft, an internal thread is provided on the inner circumferential surface of the hollow shaft, an external thread with a strengthened structure is provided on the outer circumferential surface of the upper end of the limit ejector rod 600, which naturally transitions from the lower end of the external thread to the upper end surface of the limit ejector rod 600. The upper end of the limit ejector rod 600 is threadedly connected to the adjusting shaft 300 by screwing into the adjusting shaft 300. The outer circumferential surface of the limit ejector rod 600 has a strengthened structure with a natural transition from the lower end of the external thread to the upper end surface of the limit ejector rod 600 to increase the strength of the limit ejector rod 600. The limit ejector rod 600 is not easily broken, effectively avoiding the limit ejector rod 600 from breaking due to the impact force of the valve core 520 hitting it.

[0052] Specifically, a cross slot 610 is formed at the top of the limiting ejector rod 600. Compared with the prior art, when the limiting ejector rod 600 of this embodiment moves downward to the bottom, there will be a problem of short-term oil path blockage. The cross slot 610 ensures that there is oil on the contact end surface, avoiding the dry grinding and rotation jamming of the meshing threads between the adjusting shaft 300 and the limiting ejector rod 600. The oil retained by the cross slot 610 is sufficient for the motor 120 to start easily during rotation without jamming.

[0053] Please refer to Figure 2 , in one embodiment, the first shape is selected from one of a rectangle, a kidney shape, a semi-kidney shape, an oval shape, a semi-oval shape, a kidney arc shape, a semi-kidney arc shape, an olive shape, and a semi-olive shape, and the second shape is selected from one of a rectangle, a kidney shape, a semi-kidney shape, an oval shape, a semi-oval shape, a kidney arc shape, a semi-kidney arc shape, an olive shape, and a semi-olive shape. It can be understood that the specific shape structures of the first shape and the second shape are not limited in the embodiments of the present invention. As long as the first shape and the second shape cooperate to limit the limiting ejector rod 600 to move only linearly and not rotate, and without creative efforts, they are all within the protection scope of the present invention. It should be noted that in order to enable the hydraulic oil to flow freely and unobstructed in the second chamber 410, when selecting the matching dimensions and shape structures of the first shape and the second shape, the size of the second shape is slightly larger than that of the first shape to reserve a hydraulic oil flow port, and it cannot affect the anti-rotation guiding effect of the second shape on the limiting ejector rod 600. The motor 120 drives the adjusting shaft 300 to rotate. Due to the flat square structure characteristics of the cross-section of the limiting ejector rod 600, under the anti-rotation guiding effect of the second shape, the second shape restricts the limiting ejector rod 600 from rotating, so that the limiting ejector rod 600 can only move up and down along its own axis in the second chamber 410, thereby realizing the switching of the rotational motion of the adjusting shaft 300 to the linear translational motion of the limiting ejector rod 600. In the prior art, the anti-rotation guiding member between the limiting ejector rod 600 and the base 400 adopts an anti-rotation pin. The anti-rotation pin structure is prone to deformation and has a large gap with the guiding groove. Once the anti-rotation pin is deformed, the resistance becomes larger and it is easy to cause the motor to jam. In practical applications, the deformation and jamming phenomenon here is very serious. Moreover, due to the large gap between the anti-rotation pin and the guiding groove and the easy deformation of the anti-rotation pin, the control accuracy of the opening degree of the valve core 520 is very low. In this embodiment, the purpose of anti-rotation guiding and translation of the limiting ejector rod 600 can be achieved through the self-shape structure of the limiting ejector rod 600, which not only saves the cost of the anti-rotation pin but also increases the strength of the limiting ejector rod 600, and basically does not show the phenomenon of deformation and jamming, effectively improving the control accuracy and service life of the electric control valve structure 10.

[0054] In one embodiment, the cartridge valve 500 includes a valve sleeve 510, a valve core 520, and an elastic member 530. Among them, the valve sleeve 510 is disposed at the bottom of the base 400, and an oil inlet 511 is formed at the bottom of the valve sleeve 510. Oil outlets 512 are respectively formed on both side surfaces of the valve sleeve 510; the valve core 520 is disposed within the valve sleeve 510, and the valve core 520 is used to control the communication or disconnection between the oil inlet 511 and the oil outlets 512; the elastic member 530 is sleeved on the lower end of the limit ejector rod 600, and the lower end of the elastic member 530 abuts against the valve core 520, and the upper end of the elastic member 530 abuts against the bottom surface of the base 400. When the oil pressure in the control chamber of the cartridge valve 500 is less than the external oil pressure, under the pushing action of the oil pressure difference, the valve core 520 moves upward in the valve sleeve 510 to compress the elastic member 530. At this time, the oil inlet and the oil outlets are gradually communicated. Moreover, until the valve core moves upward to abut against the lower end of the limit ejector rod, the opening degree of the communication between the oil inlet 511 and the oil outlets 512 is the largest. By adjusting the up and down movement distance of the limit ejector rod 600, the maximum opening degree of the cartridge valve 500 can be controlled, and thus the amount of oil inlet can be controlled, so as to achieve hydraulic balance; when the oil pressure in the control chamber of the cartridge valve 500 is greater than or equal to the external oil pressure, under the elastic force of the elastic member 530, the valve core 520 moves downward to the bottom in the valve sleeve 510, blocking the oil inlet 511 and the oil outlets 512.

[0055] Further, in order to prevent the hydraulic oil in the control chamber of the cartridge valve 500 from leaking, sealing rings are provided between the upper end of the adjusting shaft 300 and the housing 200, between the housing 200 and the base 400, and between the base 400 and the valve sleeve 510.

[0056] The specific working process of the electric control valve structure 10 in this embodiment is as follows:

[0057] (1) First, the motor 120 of the rotary drive assembly 100 drives the adjusting shaft 300 to rotate through the coupling 130. The limit ejector rod 600 is threadedly connected to the adjusting shaft 300. Under the axial translation guiding action of the cooperation of the first shape and the second shape, the rotational movement of the adjusting shaft 300 is converted into the axial translation movement of the limit ejector rod 600;

[0058] (2) By controlling the axial displacement of the limit ejector rod 600, the maximum distance that the valve core 520 moves upward in the valve sleeve 510 is further controlled, so as to control the maximum opening degree of the communication between the oil inlet 511 and the oil outlets 512 of the cartridge valve 500. The motor 120 indirectly controls the axial displacement of the limit ejector rod 600 by accurately adjusting the rotation angle of the adjusting shaft 300;

[0059] (3) The hydraulic oil flows into the first chamber 220 through the first oil inlet hole 420, and then the hydraulic oil in the first chamber 220 flows into the second chamber 410 through the communication oil path 210;

[0060] (4) Next, the hydraulic oil in the second chamber 410 flows into the third chamber 310 through the second oil inlet hole 320;

[0061] (5) The oil circuit 210 is connected in series so that the oil can flow smoothly up and down the control chamber of the cartridge valve 500. The upper and lower structures of the control chamber of the cartridge valve 500 are hydraulically balanced through the external circulation of the oil circuit 210. The limit push rod 600, the adjustment shaft 300, the bearings and other internal parts are fully immersed in the hydraulic oil of the control chamber of the cartridge valve 500 without dead angles, thereby preventing dry wear damage to some parts, thereby automatically achieving the purpose of hydraulic balance and reducing adjustment resistance.

[0062] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A novel structure of an electric control valve, characterized in that, Comprising: A housing; A regulating shaft rotatably connected within the housing, and a first chamber is formed between the regulating shaft and the housing; A rotary drive assembly disposed on the housing, and the rotary drive assembly is used to drive the regulating shaft to rotate; A base disposed at the bottom of the housing, and a second chamber is formed within the base. A first oil inlet hole is provided on the side wall of the second chamber, and a communicating oil passage is formed within the housing for communicating the first chamber with the second chamber; A cartridge valve disposed at the bottom of the base; and A limiting ejector rod, the upper end of which is threadedly connected to the regulating shaft. A third chamber is formed between the limiting ejector rod and the regulating shaft. A second oil inlet hole is provided on the side wall of the third chamber for communicating the first chamber and the third chamber. The lower end of the limiting ejector rod passes through the second chamber and is inserted into the cartridge valve, and the limiting ejector rod is used to control the maximum opening of the valve of the cartridge valve. The cross-section of the limiting ejector rod is of a first shape, and the cross-section of the second chamber is of a second shape. The cooperation between the second shape and the first shape can limit the limiting ejector rod to move only linearly and not rotate; The regulating shaft is a hollow shaft, and an internal thread is provided on the inner circumferential surface of the hollow shaft; The hollow shaft includes an upper end and a lower end, and the diameter of the upper end is smaller than that of the lower end; The hollow part of the hollow shaft is provided at the lower end of the hollow shaft; The cartridge valve includes: A valve sleeve disposed at the bottom of the base, and an oil inlet is provided at the bottom of the valve sleeve, and oil outlet holes are respectively provided on both side surfaces of the valve sleeve; A valve core disposed within the valve sleeve, and the valve core is used to control the communication or disconnection between the oil inlet and the oil outlet holes; and An elastic member sleeved on the lower end of the limiting ejector rod, with the lower end of the elastic member abutting against the valve core and the upper end of the elastic member abutting against the bottom surface of the base.

2. The structure of a novel electric control valve according to claim 1, wherein The rotary drive assembly includes: A shock-absorbing bracket disposed on the top of the housing; A motor disposed on the shock-absorbing bracket; and A coupling connecting the rotating shaft of the motor to the regulating shaft.

3. The structure of a novel electric control valve according to claim 2, wherein, The motor is a servo motor with an absolute encoder.

4. The structure of a novel electric control valve according to claim 2, characterized in that, The coupling is a polygonal rubber coupling.

5. A novel electric control valve structure according to claim 1, characterized in that, The outer circumferential surface of the upper end of the regulating shaft is connected to the inner circumferential surface of the housing through a first bearing, and the outer circumferential surface of the lower end of the regulating shaft is connected to the inner circumferential surface of the housing through a second bearing.

6. The structure of a novel electric control valve according to claim 5, wherein, A flange is provided on the outer circumferential surface of the regulating shaft, and a step is provided on the inner circumferential surface of the housing. A plain bearing is provided between the flange and the step.

7. A novel electric control valve structure according to claim 1, characterized in that, An externally threaded portion with a strengthened structure is provided on the outer circumferential surface of the upper end of the limiting ejector rod, naturally transitioning from the lower end of the externally threaded portion to the upper end surface of the limiting ejector rod. The upper end of the limiting ejector rod is threadedly connected to the regulating shaft by screwing into the regulating shaft.

8. The structure of a novel electric control valve according to claim 7, wherein, A cross slot is provided at the top of the limiting ejector rod.

9. The structure of a novel electric control valve according to claim 1, characterized in that, The first shape is selected from one of a rectangle, a kidney shape, a semi-kidney shape, an oval shape, a semi-oval shape, a kidney arc shape, a semi-kidney arc shape, an olive shape, and a semi-olive shape, and the second shape is selected from one of a rectangle, a kidney shape, a semi-kidney shape, an oval shape, a semi-oval shape, a kidney arc shape, a semi-kidney arc shape, an olive shape, and a semi-olive shape. Moreover, the cooperation between the second shape and the first shape can limit the limiting ejector rod to only move linearly and not rotate.

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