A double-limit electric control valve

Abstract

The present application discloses a double-limiting electro-regulating valve, which includes a cartridge valve, an adjusting assembly, and a pair of limiting rods; the limiting rods are adapted to extend to the limiting end of the cartridge valve, and the distances from the ends of each limiting rod to the valve core in the cartridge valve are different; among them, the limiting rod closest to the valve core is connected to the adjusting assembly, so that during rapid injection, the adjusting assembly is adapted to release the limit of the valve core by the limiting rod connected to it. Beneficial effects of the present application: By providing at least two limiting rods on a single cartridge valve and controlling the stroke of one of the limiting rods through the adjusting assembly, it is possible to use a single cartridge valve to achieve multi-opening control scenarios for slow injection and rapid injection, thereby effectively reducing costs and improving the response speed of the oil circuit.

Description

Technical Field

[0001] This application relates to the technical field of valve control, and particularly to a double-limiting electric control valve. Background Art

[0002] Current small-tonnage non-servo-controlled die-casting machines usually use electric control valves and manual control valves for control. Since two speeds, slow speed and fast speed, are required in the most basic injection process, current non-servo die-casting machines need two valves, one for controlling the slow injection speed and the other for controlling the fast injection speed. Of course, this speed regulation method is not adjusted during the injection process. Instead, after the current injection process ends and before the next injection process, the depth of the screw rod extended by the runner or motor is adjusted, and the injection speed is limited by restricting the maximum opening of the valve. From the above traditional injection speed control process, it can be seen that each electric control valve can only limit one speed during the injection process, which leads to the need to use multiple electric control valves in the scenario of multiple injection speeds. This will increase the cost, and multiple electric control valves will make the design of the oil circuit more difficult. Summary of the Invention

[0003] One of the purposes of this application is to provide a double-limiting electric control valve that can solve at least one defect in the above background art.

[0004] To achieve at least one of the above purposes, the technical solution adopted in this application is: a double-limiting electric control valve, including a cartridge valve, an adjustment assembly, and a pair of limit rods; the limit rods are adapted to extend to the limiting end of the cartridge valve, and the distances from the ends of each limit rod to the valve core in the cartridge valve are different; among them, the second limit rod closest to the valve core is connected to the adjustment assembly, so that during fast injection, the adjustment assembly is adapted to release the limit of the valve core by the second limit rod connected thereto.

[0005] Preferably, the double-limiting electric control valve further includes a first driving device and a second driving device; the second limit rod is connected to the second driving device through the adjustment assembly, and the first driving device is directly connected to the other first limit rod; the first driving device and the second driving device are adapted to adjust the initial distances from their respective corresponding limit rods to the valve core according to the opening requirement of the cartridge valve.

[0006] Preferably, the adjusting assembly includes an adjusting oil cylinder and a reversing valve; the adjusting oil cylinder is cooperatively connected to the output end of the second driving device, and the second limiting rod is connected to the piston of the adjusting oil cylinder; when slow injection is required, the reversing valve is adapted to convey the pumped hydraulic oil to the rodless cavity of the adjusting oil cylinder, and the hydraulic oil in the rod cavity of the adjusting oil cylinder flows back to the fuel tank through the reversing valve, so that the second limiting rod performs maximum limiting on the spool; when fast injection is required, the reversing valve is adapted to convey the pumped hydraulic oil to the rod cavity of the adjusting oil cylinder, and the hydraulic oil in the rodless cavity of the adjusting oil cylinder flows back to the fuel tank through the reversing valve, so that the second limiting rod releases the limiting on the spool.

[0007] Preferably, the second driving device adopts a motor, and the adjusting oil cylinder is threadedly connected to the output end of the second driving device through a first connecting rod; the adjusting oil cylinder or the first connecting rod is limited in the circumferential direction, so that the adjusting oil cylinder drives the second limiting rod to move vertically under the drive of the second driving device, and further adjusts the opening degree of the cartridge valve during slow injection.

[0008] Preferably, the second driving device adopts a motor; the adjusting assembly includes an adjusting seat and an adjusting sleeve; the adjusting seat is cooperatively connected to the second driving device, the adjusting sleeve is sleeved and cooperatively connected to the adjusting seat and is connected through a traction structure, the second limiting rod is connected to the adjusting sleeve, and the second limiting rod is in circumferential limiting cooperation with the cartridge valve; when fast injection is required, the adjusting seat rotates a set angle under the drive of the second driving device, so that the adjusting seat and the adjusting sleeve are changed from axial limiting cooperation to sliding cooperation with an axial set distance through the traction structure.

[0009] Preferably, the traction structure includes a traction block respectively arranged on the adjusting seat and a traction groove arranged on the adjusting sleeve; the traction groove includes an axial groove section and a circumferential groove section, and the circumferential groove section communicates with one end of the axial groove section far from the second limiting rod; when slow injection is performed, the traction block is located in the circumferential groove section; when fast injection is required, the traction block slides along the circumferential groove section to the axial groove section under the rotation drive of the second driving device, so that the second limiting rod releases the limiting on the spool through the relative vertical sliding of the traction block along the axial groove section.

[0010] Preferably, the adjusting sleeve or the second limiting rod connected to the adjusting sleeve is elastically installed, so that when the cartridge valve is closed, the adjusting sleeve and the second limiting rod are reset under the action of elastic force, and further the traction block relatively slides along the axial groove section to one end close to the circumferential groove section.

[0011] Preferably, the double-limiting electric control valve is vertically installed so that when the cartridge valve is closed, the adjusting sleeve and the second limiting rod are reset under the action of gravity, and then the traction block slides relative to the axial groove section to one end close to the circumferential groove section.

[0012] Preferably, there are a plurality of traction grooves, and the plurality of traction grooves are arranged at intervals along the circumferential direction of the adjusting sleeve. The lengths of the axial groove sections corresponding to the plurality of traction grooves are different, and the circumferential groove sections corresponding to the plurality of traction grooves are flush and communicated with each other.

[0013] Preferably, the first driving device is directly threadedly connected to the corresponding first limiting rod, and the first limiting rod is in circumferential direction limiting cooperation so that the first limiting rod axially moves under the drive of the first driving device to adjust the distance from the valve core.

[0014] Compared with the prior art, the beneficial effects of the present application are as follows:

[0015] By providing at least two limiting rods on a cartridge valve and controlling the stroke of one of the limiting rods through an adjusting component, a multi-opening control scenario of slow injection and fast injection can be realized by using a single cartridge valve, thereby effectively reducing costs and improving the response speed of the oil circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the electric control valve formed by Example 1 of the adjusting component adopted by the present application Figure 1 .

[0017] Figure 2 It is a schematic diagram of the overall structure of the electric control valve formed by Example 1 of the adjusting component adopted by the present application Figure 2 .

[0018] Figure 3 It is a schematic diagram of the overall structure of the electric control valve formed by Example 2 of the adjusting component adopted by the present application Figure 1 .

[0019] Figure 4 It is a schematic diagram of the overall structure of the electric control valve formed by Example 2 of the adjusting component adopted by the present application Figure 2 .

[0020] In the figure: cartridge valve 1, first driving device 21, second driving device 22, first limiting rod 23, second limiting rod 24, adjusting component 3, adjusting oil cylinder 31, first connecting rod 311, reversing valve 32, adjusting seat 33, second connecting rod 331, traction block 332, adjusting sleeve 34, traction groove 340, circumferential groove section 3401, axial groove section 3402. DETAILED DESCRIPTION OF THE INVENTION

[0021] Next, in combination with specific implementation manners, the present application will be further described. It should be noted that in the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0022] In the description of the present application, it should be noted that for orientation terms, such as terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the indicated orientation and position relationships are based on the orientation or position relationships shown in the drawings. This is only for the convenience of describing the present application 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, and should not be construed as limiting the specific protection scope of the present application.

[0023] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence.

[0024] In the present application, unless otherwise clearly specified and defined, terms such as "install", "connect", "connection", "fix", etc. should be understood in a broad sense. For example, it can be a 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 elements or the interaction relationship between two elements. 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.

[0025] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may also include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly under and obliquely under the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0026] The terms "comprise" and "have" and any variations thereof in the description and claims of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these process, method, product or device.

[0027] One preferred embodiment of this application, as Figure 1 and Figure 2 shown, is a double-limiting electro-regulating valve, which includes a cartridge valve 1, an adjusting assembly 3 and a pair of limiting rods. The limiting rods can extend to the limiting end of the cartridge valve 1, and the distances from the ends of each limiting rod to the spool inside the cartridge valve 1 are different; among them, the limiting rod closest to the spool is connected to the adjusting assembly 3, so that during rapid injection, the action of the adjusting assembly 3 can release the limitation of the spool by the limiting rod connected thereto.

[0028] It should be known that the specific structure and working principle of the cartridge valve 1 are both well-known technologies to those skilled in the art, so only a simple description is given here. The cartridge valve 1 includes a valve body, a spool and a spring. The spool is elastically and slidably installed inside the valve body through the spring. The opening degree of the cartridge valve 1 can be represented by the stroke of the spool. The greater the opening degree of the cartridge valve 1, the greater the deformation degree of the spring. The limiting end of the cartridge valve 1 is the end that can limit the movement of the spool.

[0029] In this embodiment, the limiting capabilities of the two limiting rods are different according to their different distances from the spool. One of the limiting rods is used for limiting the spool during slow injection. At this time, the opening requirement of the cartridge valve 1 is small, so the initial distance between this limiting rod and the spool is relatively close, so that the stroke that the spool can be lifted is short; correspondingly, the other limiting rod is used for limiting the spool during fast injection. At this time, the opening requirement of the cartridge valve 1 is large, so the initial distance between this limiting rod and the spool is relatively far, so that the stroke that the spool can be lifted is long. For the convenience of description, the limiting rod used for fast injection limiting later is called the first limiting rod 23, and the other limiting rod used for slow injection limiting is called the second limiting rod 24.

[0030] It can be understood that in this embodiment, the first limiting rod 23 and the second limiting rod 24 are installed in the cartridge valve 1 at the same time, and the second limiting rod 24 can be controlled by the adjusting assembly 3. During slow injection, the second limiting rod 24 can limit the spool. During fast injection, the second limiting rod 24 can move in position under the action of the adjusting assembly 3 until the distance between the second limiting rod 24 and the spool is greater than the distance between the first limiting rod 23 and the spool, so that the spool is limited by the first limiting rod 23 during fast injection. In this way, the opening requirements for different injection scenarios can be met by one cartridge valve 1, so that the number of cartridge valves 1 used can be reduced to reduce costs; at the same time, the reduction in the number of cartridge valves 1 can further simplify the structure of the injection oil circuit to improve the response speed during the switching of injection scenarios.

[0031] In this embodiment, for different usage scenarios, such as different models of die-casting machines or different types of products, the speed and pressure requirements during fast injection and slow injection may be different. That is, under different usage scenarios, the initial distances between the first limiting rod 23 and the second limiting rod 24 and the spool of the cartridge valve 1 may be different. Then, in order to adapt to different usage scenarios, it is necessary to adjust the initial positions of the first limiting rod 23 and the second limiting rod 24. There are various specific adjustment methods, such as manual adjustment or drive source adjustment.

[0032] For a specific example of manual adjustment, the first limiting rod 23 and the adjusting assembly 3 can be threadedly connected to the valve body of the cartridge valve 1, and then the first limiting rod 23 and the adjusting assembly 3 are manually rotated to respectively adjust the initial distances between the first limiting rod 23 and the second limiting rod 24 and the spool.

[0033] For a specific example of drive source adjustment, such as Figure 1 and Figure 2As shown, the double-limit electric control valve further includes a first driving device 21 and a second driving device 22. The second limiting rod 24 connected to the adjusting assembly 3 is cooperatively connected to the second driving device 22 through the adjusting assembly 3, and the first driving device 21 is directly cooperatively connected to the first limiting rod 23. The first driving device 21 and the second driving device 22 can adjust the initial distance from their respective corresponding limiting rods to the valve core according to the opening requirement of the cartridge valve 1.

[0034] It should be known that the above two methods can both meet the requirements of this application. However, in order to reduce the labor intensity and ensure safety, the adjustment of the initial position of the limiting rod preferably adopts the method of driving source adjustment. There are various specific types to choose from for the first driving device 21 and the second driving device 22. It can use a motor, or a hydraulic cylinder or a pneumatic cylinder, etc. However, considering that the hydraulic cylinder will increase the complexity of the oil circuit structure and the pneumatic cylinder requires an additional gas cylinder, the first driving device 21 and the second driving device 22 preferably adopt a motor.

[0035] Specifically, as Figure 1 and Figure 2 shown, for the position adjustment of the first limiting rod 23, the first driving device 21 is directly threadedly connected to the corresponding first limiting rod 23, and the first limiting rod 23 is in circumferential limiting cooperation, so that the first limiting rod 23 moves axially under the driving of the rotation of the first driving device 21 to adjust the distance from the valve core.

[0036] It should be known that there are various ways for the first limiting rod 23 to be in circumferential limiting cooperation. It can be in cooperation with the valve body of the cartridge valve 1, or in cooperation through an additional limiting structure. There are also various specific limiting structures. Taking the cooperation between the first limiting rod 23 and the valve body as an example, it can be a spline fit between the first limiting rod 23 and the valve body, or the first limiting rod 23 adopts a non-circular cross-section structure and slides with the valve body. It can be specifically selected according to the actual needs of those skilled in the art. And the specific method for adjusting the initial position of the second limiting rod 24 may be related to the specific structure of the adjusting assembly 3. For the convenience of understanding, the following will be described in detail in combination with the specific structure of the adjusting assembly 3; there are various specific structures of the adjusting assembly 3, and the following will be described in detail through two specific examples.

[0037] Example 1:

[0038] As Figure 1 and Figure 2As shown, the adjusting assembly 3 includes an adjusting oil cylinder 31 and a reversing valve 32. The adjusting oil cylinder 31 is cooperatively connected to the output end of the second driving device 22, and the second limiting rod 24 is connected to the piston of the adjusting oil cylinder 31. When slow injection is required, the reversing valve 32 can convey the pumped oil to the rodless cavity of the adjusting oil cylinder 31, and at the same time, the oil in the rod cavity of the adjusting oil cylinder 31 flows back to the fuel tank through the reversing valve 32, so that the second limiting rod 24 provides maximum limiting for the valve core. When fast injection is required, the reversing valve 32 can reverse, thereby conveying the pumped oil to the rod cavity of the adjusting oil cylinder 31, and at the same time, the oil in the rodless cavity of the adjusting oil cylinder 31 flows back to the fuel tank through the reversing valve 32, so that the second limiting rod 24 moves away from the valve core to release the limiting of the valve core.

[0039] It should be known that the capacity of the adjusting oil cylinder 31 is small, which can realize the rapid movement of the piston, thus enabling rapid adjustment of the second limiting rod 24. The specific structure and working principle of the reversing valve 32 are well-known technologies to those skilled in the art, so they will not be elaborated in detail here.

[0040] In this example, for the adjustment of the initial distance between the second limiting rod 24 and the valve core in different scenarios. As Figure 1 and Figure 2 shown, the adjusting oil cylinder 31 is threadedly connected to the output end of the second driving device 22 through a first connecting rod 311. The adjusting oil cylinder 31 or the first connecting rod 311 is provided with circumferential limiting, so that the adjusting oil cylinder 31 drives the second limiting rod 24 to move vertically under the drive of the rotation of the second driving device 22, and then adaptively adjusts the opening of the cartridge valve 1 in different slow injection scenarios.

[0041] It should be known that there are various circumferential limiting methods for the corresponding adjusting oil cylinder 31 or the first connecting rod 311. It is preferred to use an additional limiting structure to limit the adjusting oil cylinder 31 or the first connecting rod 311. For example, taking the first connecting rod 311 as an example, the first connecting rod 311 can be set as a non-circular cross-section structure, and then the first connecting rod 311 is passed through a limiting sleeve with a corresponding shape to achieve circumferential limiting.

[0042] Example Two:

[0043] As Figure 3 and Figure 4As shown in the figure, the adjusting assembly 3 includes an adjusting base 33 and an adjusting sleeve 34. The adjusting base 33 is connected to the second driving device 22 through a second connecting rod 331. The adjusting sleeve 34 is sleeved with the adjusting base 33 and connected through a traction structure. The second limiting rod 24 is fixedly connected to the adjusting sleeve 34, and the second limiting rod 24 is in a circumferential limiting fit with the inserted valve 1. When slow injection is performed, the adjusting base 33 and the adjusting sleeve 34 are axially limited and matched through the traction structure, so that the initial distance between the second limiting rod 24 and the valve core is locked, thereby realizing the limiting of the valve core under slow injection. When fast injection is required, the adjusting base 33 rotates a set angle under the drive of the second driving device 22, so that the adjusting base 33 and the adjusting sleeve 34 are changed from axially limited fit to sliding fit with an axially set distance through the traction structure, so that the second limiting rod 24 can move freely axially to release the limit on the valve core.

[0044] In this example, as Figure 3 and Figure 4 shown, the traction structure includes a traction groove 340 and a traction block 332; the traction groove 340 is arranged on the adjusting base 33, and the traction block 332 is arranged on the adjusting sleeve 34; alternatively, the traction groove 340 is arranged on the adjusting sleeve 34, and the traction block 332 is arranged on the adjusting base 33. The specific setting method of the traction groove 340 and the traction block 332 can be selected according to the actual needs of those skilled in the art. For the convenience of understanding, the following will take the traction groove 340 arranged on the adjusting sleeve 34 and the traction block 332 arranged on the adjusting base 33 as an example for detailed description.

[0045] Specifically, as Figure 4 shown, the traction groove 340 includes an axial groove section 3402 and a circumferential groove section 3401. The axial groove section 3402 extends along the axis of the adjusting sleeve 34, and the circumferential groove section 3401 extends along the circumferential direction of the adjusting sleeve 34; the circumferential groove section 3401 communicates with one end of the axial groove section 3402 away from the limiting rod. When slow injection is performed, the traction block 332 is located in the circumferential groove section 3401, so that the second limiting rod 24 connected to the adjusting sleeve 34 is in the maximum limiting state. When fast injection is required, the traction block 332 slides along the circumferential groove section 3401 to the axial groove section 3402 under the rotational drive of the second driving device 22, so that the relative vertical sliding of the traction block 332 along the axial groove section 3402 releases the limit of the second limiting rod 24 on the valve core.

[0046] It can be understood that during fast shot, the traction block 332 will slide along the axial groove section 3402 to the end close to the second limit rod 24. Then, to ensure the normal progress of the next die-casting process, it is necessary to reset the traction block 332 to the circumferential groove section 3401 position after the current fast shot to facilitate the opening degree limitation of the cartridge valve 1 during the slow shot of the next die-casting process. There are various ways to reset the traction block 332 after the fast shot. For the convenience of understanding, the following will be described in detail through two specific methods.

[0047] Method 1: The adjusting sleeve 34 or the second limit rod 24 connected to the adjusting sleeve 34 is elastically installed. For example, the adjusting sleeve 34 is elastically connected and installed with the valve body through a spring (not shown). Thus, during fast shot, the adjusting sleeve 34 can move away from the cartridge valve 1 under the extrusion of the valve core, and at this time, the spring connected to the adjusting sleeve 34 is in a tensile deformation state. When the fast shot is completed, the cartridge valve 1 will close. At this time, the adjusting sleeve 34 together with the second limit rod 24 will move towards the cartridge valve 1 under the reset elastic force of the spring until the traction block 332 slides back to the intersection position of the axial groove section 3402 and the circumferential groove section 3401. Subsequently, the second driving device 22 can drive the adjusting seat 33 to drive the traction block 332 to slide into the circumferential groove section 3401 to achieve the axial limit of the adjusting seat 33 and the adjusting sleeve 34 for controlling the opening degree during the slow shot of the next die-casting.

[0048] It should be noted that during fast shot, the second limit rod 24 will always abut against the valve core of the cartridge valve 1 under the action of the spring. Therefore, the elastic coefficient of the spring used for the valve core reset in the cartridge valve 1 can be reduced, and the reduced part is compensated by the spring connected to the adjusting sleeve 34.

[0049] Method 2: Based on specific installation conditions, the double-limit electric control valve is installed vertically. Thus, during fast shot, the adjusting sleeve 34 can vertically move upward against gravity away from the cartridge valve 1 under the extrusion of the valve core. When the fast shot is completed, the cartridge valve 1 will close. At this time, the adjusting sleeve 34 and the second limit rod 24 will reset and move downward under the action of gravity, and then the traction block 332 will relatively slide along the axial groove section 3402 to the upper end close to the circumferential groove section 3401. Then, the second driving device 22 can drive the adjusting seat 33 to drive the traction block 332 to slide into the circumferential groove section 3401 to achieve the axial limit of the adjusting seat 33 and the adjusting sleeve 34 for controlling the opening degree during the slow shot of the next die-casting.

[0050] In this example, for the adjustment of the initial distance between the second limit rod 24 and the valve core in different scenarios. Such as Figure 3 and Figure 4As shown, there are multiple traction grooves 340. The multiple traction grooves 340 are spaced along the circumferential direction of the adjusting sleeve 34. The lengths of the axial groove segments 3402 corresponding to the multiple traction grooves 340 are different, and the circumferential groove segments 3401 corresponding to the multiple traction grooves 340 are flush and communicate with each other. Thus, when adjusting the initial distance between the second limiting rod 24 and the valve core, the adjusting seat 33 can drive the traction block 332 to slide along the circumferential groove segment 3401 under the rotation of the second driving device 22 to near the traction groove 340 corresponding to the corresponding limiting condition.

[0051] It should be known that the specific number of the traction grooves 340 and the lengths of the axial groove segments 3402 corresponding to each traction groove 340 can be set according to the actual needs of those skilled in the art.

[0052] The above describes the basic principle, main features and advantages of the present application. Those skilled in the art of this industry should understand that the present application is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present application. Without departing from the spirit and scope of the present application, the present application will have various changes and improvements, and these changes and improvements all fall within the scope of the present application claimed. The scope of protection required by the present application is defined by the appended claims and their equivalents.

Claims

1. A double-limit electric regulating valve, characterized in that: It comprises a cartridge valve, an adjustment assembly and a pair of limit rods; the limit rods are suitable for extending to the limit end of the cartridge valve, and the distances from the ends of the limit rods to the valve core in the cartridge valve are different; The second limiting rod closest to the valve core is connected to the regulating assembly, so that when performing rapid injection, the regulating assembly is suitable for releasing the limiting of the valve core by the second limiting rod connected thereto; The dual-limit electric regulating valve also includes a first driving device and a second driving device; The second limiting rod is connected with the second driving device through the adjusting assembly, and the first driving device is directly connected with another first limiting rod; The first driving device and the second driving device are adapted to adjust the initial distance from the respective limiting rod to the valve core according to the opening requirement of the cartridge valve; The regulating assembly includes a regulating oil cylinder and a reversing valve; The regulating oil cylinder is cooperatively connected with the output end of the second driving device, and the second limiting rod is connected to the piston of the regulating oil cylinder; When slow injection is required, the reversing valve is suitable for delivering the pumped oil to the rodless chamber of the regulating oil cylinder, and the oil in the rod chamber of the regulating oil cylinder flows back to the oil tank through the reversing valve, so that the second limiting rod limits the valve core to the maximum position; When rapid injection is required, the reversing valve is suitable for delivering the pumped oil to the rod chamber of the regulating cylinder, and the oil in the rodless chamber of the regulating cylinder flows back to the oil tank through the reversing valve, so that the second limiting rod releases the limit on the valve core.

2. The double-limit electric regulating valve according to claim 1, characterized in that: The second driving device adopts a motor, and the regulating cylinder is threadedly connected to the output end of the second driving device through a first connecting rod; The regulating cylinder or the first connecting rod is limited in the circumferential direction, so that the regulating cylinder drives the second limiting rod to move vertically under the driving of the second driving device, thereby adjusting the opening of the cartridge valve during slow injection.

3. A double-limit electric regulating valve, characterized in that: It comprises a cartridge valve, an adjustment assembly and a pair of limit rods; the limit rods are suitable for extending to the limit end of the cartridge valve, and the distances from the ends of the limit rods to the valve core in the cartridge valve are different; The second limiting rod closest to the valve core is connected to the regulating assembly, so that when performing rapid injection, the regulating assembly is suitable for releasing the limiting of the valve core by the second limiting rod connected thereto; The dual-limit electric regulating valve also includes a first driving device and a second driving device; The second limiting rod is connected with the second driving device through the adjusting assembly, and the first driving device is directly connected with another first limiting rod; The first driving device and the second driving device are adapted to adjust the initial distance from the respective limiting rod to the valve core according to the opening requirement of the cartridge valve; The second driving device adopts a motor; the adjusting assembly includes an adjusting seat and an adjusting sleeve; the adjusting seat is connected with the second driving device, the adjusting sleeve is connected with the adjusting seat and connected through a traction structure, the second limiting rod is connected to the adjusting sleeve, and the second limiting rod is matched with the cartridge valve in a circumferential direction; When rapid injection is required, the adjustment seat is driven by the second driving device to rotate a set angle, so that the axial limiting fit between the adjustment seat and the adjustment sleeve is transformed into a sliding fit with an axial set distance through the traction structure.

4. The double-limit electric regulating valve according to claim 3, characterized in that: The traction structure comprises traction blocks respectively arranged on the adjustment seat and a traction groove arranged on the adjustment sleeve; the traction groove comprises an axial groove section and a circumferential groove section, and the circumferential groove section is connected to an end of the axial groove section away from the second limiting rod; When performing slow injection, the traction block is located in the circumferential groove segment; When rapid injection is required, the traction block slides along the circumferential groove section to the axial groove section under the rotation of the second driving device, so that the second limiting rod releases the limiting of the valve core through the relative vertical sliding of the traction block along the axial groove section.

5. The double-limit electric regulating valve according to claim 4, characterized in that: The adjusting sleeve or the second limiting rod connected to the adjusting sleeve is elastically installed so that when the cartridge valve is closed, the adjusting sleeve and the second limiting rod are reset under the action of elastic force, and then the traction block slides relatively along the axial groove section to one end close to the circumferential groove section.

6. The double-limit electric regulating valve according to claim 4, characterized in that: The double-limit electric regulating valve is installed vertically so that when the cartridge valve is closed, the adjustment sleeve and the second limit rod are reset under the action of gravity, and then the traction block slides relatively along the axial groove section to one end close to the circumferential groove section.

7. The double-limit electric regulating valve according to claim 4, characterized in that: There are multiple traction grooves, and the multiple traction grooves are spaced apart along the circumferential direction of the adjustment sleeve. The axial groove segments corresponding to the multiple traction grooves have different lengths, and the circumferential groove segments corresponding to the multiple traction grooves are flush with each other and connected.

8. The double-limit electric regulating valve according to any one of claims 1 to 7, characterized in that: The first driving device is directly threadedly connected to the corresponding first limiting rod, and the first limiting rod is limited in the circumferential direction, so that the first limiting rod moves axially under the driving of the first driving device to adjust the distance between the first limiting rod and the valve core.

Images