Double-limiting electric adjusting valve

Abstract

The invention discloses a double-limiting electric adjusting valve which comprises a cartridge valve, an adjusting assembly and a pair of limiting rods. The limiting rods are suitable for extending to the limiting ends of the cartridge valves, and the distances from the ends of the limiting rods to valve elements in the cartridge valves are different. Wherein the limiting rod closest to the valve element is connected with the adjusting assembly, so that the adjusting assembly is suitable for relieving limiting of the limiting rod connected with the adjusting assembly to the valve element during rapid injection. The cartridge valve has the beneficial effects that at least two limiting rods are arranged on one cartridge valve, stroke control is conducted on one limiting rod through the adjusting assembly, the multi-opening-degree control scene of low-speed injection and high-speed injection can be achieved through the single cartridge valve, and therefore the cost is effectively reduced, and the response speed of an oil way is effectively increased.

Description

Technical Field

[0001] The present application relates to the field of valve control technology, and in particular to a double-limit electric regulating valve. Background Art

[0002] Current small-tonnage non-servo-controlled die-casting machines are usually controlled by electric control valves and manual control valves. Since the most basic injection process requires two speeds, slow and fast, the current non-servo die-casting machines require 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, but after the current injection process ends and before the next injection process, the depth of the screw is adjusted by a wheel or motor, and the injection speed is limited by limiting the maximum opening of the valve. It can be seen from the above-mentioned traditional injection speed control process 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 multiple injection speed scenarios, which will lead to increased costs, 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 the present application is to provide a dual-limit electric regulating valve that can solve at least one defect in the above-mentioned background technology.

[0004] In order to achieve at least one of the above-mentioned purposes, the technical solution adopted in the present application is: a double-limit electric regulating valve, including 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 each limit rod to the valve core in the cartridge valve are different; wherein the limit rod closest to the valve core is connected to the adjustment assembly, so that when rapid injection is performed, the adjustment assembly is suitable for releasing the limit of the valve core by the limit rod connected thereto.

[0005] Preferably, the dual-limit electric regulating valve also includes a first drive device and a second drive device; the limit rod connected to the adjusting component is cooperated with the second drive device through the adjusting component, and the first drive device is directly cooperated with the other limit rod; the first drive device and the second drive device are suitable for adjusting the initial distance from the corresponding limit rod to the valve core according to the opening requirement of the cartridge valve.

[0006] Preferably, the adjusting component includes an adjusting cylinder and a reversing valve; the adjusting cylinder is cooperatively connected with the output end of the second driving device, and the limiting rod is connected to the piston of the adjusting cylinder; when slow injection is required, the reversing valve is suitable for conveying the pumped oil to the rodless chamber of the adjusting cylinder, and the oil in the rod chamber of the adjusting cylinder flows back to the oil tank through the reversing valve, so that the limiting rod can limit the valve core to the maximum; when fast injection is required, the reversing valve is suitable for conveying the pumped oil to the rod chamber of the adjusting cylinder, and the oil in the rodless chamber of the adjusting cylinder flows back to the oil tank through the reversing valve, so that the limiting rod can release the limit on the valve core.

[0007] Preferably, the second driving device adopts an electric motor, and the adjusting cylinder is threadedly connected to the output end of the second driving device through a first connecting rod; the adjusting cylinder or the first connecting rod is limited in the circumferential direction, so that the adjusting cylinder drives the limiting rod to move vertically under the drive of the second driving device, thereby adjusting the opening 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 connected with the second driving device, the adjusting sleeve is sleeve-fitted with the adjusting seat and connected through a traction structure, the limiting rod is connected to the adjusting sleeve, and the limiting rod is limited in a circumferential direction with the cartridge valve; when rapid injection is required, the adjusting seat is driven by the second driving device to rotate a set angle, so that the axial limiting fit between the adjusting seat and the adjusting sleeve is transformed into a sliding fit of an axial set distance through the traction structure.

[0009] Preferably, the traction structure includes traction blocks respectively arranged on the adjustment seat and a traction groove arranged on the adjustment sleeve; the traction groove includes an axial groove segment and a circumferential groove segment, and the circumferential groove segment is connected to an end of the axial groove segment away from the limiting rod; when slow injection is performed, the traction block is located in the circumferential groove segment; when fast injection is required, the traction block slides along the circumferential groove segment to the axial groove segment under the rotation of the second driving device, so that the limiting of the valve core by the limiting rod is released by the relative vertical sliding of the traction block along the axial groove segment.

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

[0011] Preferably, the double-limit electric regulating valve is installed vertically so that when the cartridge valve is closed, the adjustment sleeve and the limit rod are reset under the action of gravity, and then the traction block slides relatively along the axial groove segment to one end close to the circumferential groove segment.

[0012] Preferably, there are multiple traction grooves, and the multiple traction grooves are spaced apart along the circumferential direction of the adjustment sleeve. The axial groove sections corresponding to the multiple traction grooves have different lengths, and the horizontal groove sections corresponding to the multiple traction grooves are flush with each other and connected.

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

[0014] Compared with the prior art, the beneficial effects of this application are: By providing at least two limit rods on a cartridge valve and controlling the stroke of one of the limit rods through an adjusting component, a single cartridge valve can be used to implement multi-opening control scenarios of slow injection and fast injection, thereby effectively reducing costs and improving the response speed of the oil circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The overall structure of the electric regulating valve is shown in the example of the regulating assembly used in this application. Figure 1 .

[0016] Figure 2 The overall structure of the electric regulating valve is shown in the example of the regulating assembly used in this application. Figure 2 .

[0017] Figure 3 The overall structure of the electric regulating valve formed by the second example of the regulating assembly used in this application is shown in FIG. Figure 1 .

[0018] Figure 4 The overall structure of the electric regulating valve formed by the second example of the regulating assembly used in this application is shown in FIG. Figure 2 .

[0019] In the figure: cartridge valve 1, first drive device 21, second drive device 22, first limit rod 23, second limit rod 24, adjustment assembly 3, adjustment cylinder 31, first connecting rod 311, reversing valve 32, adjustment seat 33, second connecting rod 331, traction block 332, adjustment sleeve 34, traction groove 340, circumferential groove section 3401, axial groove section 3402. DETAILED DESCRIPTION

[0020] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0021] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present application.

[0022] 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 are not necessarily used to describe a specific order or sequence.

[0023] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0025] The terms "including" and "having" and any variations thereof in the specification and claims of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0026] One of the preferred embodiments of the present application is as follows: Figure 1 and Figure 2 As shown, a double-limit electric regulating valve comprises a cartridge valve 1, an adjusting assembly 3 and a pair of limit rods. The limit rods can extend to the limit end of the cartridge valve 1, and the distances between the ends of the limit rods and the valve core in the cartridge valve 1 are different; the limit rod closest to the valve core is connected to the adjusting assembly 3, so that when rapid injection is performed, the limit rod connected thereto can release the limit on the valve core through the action of the adjusting assembly 3.

[0027] It should be known that the specific structure and working principle of the cartridge valve 1 are well-known technologies to those skilled in the art, so only a brief description is given here. The cartridge valve 1 includes a valve body, a valve core and a spring, and the valve core is slidably installed inside the valve body through a spring elastic seal. The opening of the cartridge valve 1 can be represented by the stroke of the valve core. The larger the opening of the cartridge valve 1, the greater the deformation of the spring. The limiting end of the cartridge valve 1 can be the end that limits the movement of the valve core.

[0028] In this embodiment, the limiting capabilities formed by the two limiting rods are different according to the distances from the valve core. One of the limiting rods is used for limiting the valve core during slow injection. At this time, the opening requirement of the cartridge valve 1 is small, and the initial distance between the limiting rod and the valve core is close, so that the valve core can be lifted up for a shorter stroke; the corresponding other limiting rod is used for limiting the valve core during fast injection. At this time, the opening requirement of the cartridge valve 1 is large, and the initial distance between the limiting rod and the valve core is far, so that the valve core can be lifted up for a longer stroke. For the convenience of description, the limiting rod used for fast injection limiting is referred to as the first limiting rod 23, and the other limiting rod used for slow injection limiting is referred to as the second limiting rod 24.

[0029] It can be understood that in this embodiment, the first limit rod 23 and the second limit rod 24 are installed in one cartridge valve 1 at the same time, and the second limit rod 24 can be controlled by the adjustment component 3. During slow injection, the second limit rod 24 can limit the valve core, and during fast injection, the second limit rod 24 can move under the action of the adjustment component 3 until the distance from the second limit rod 24 to the valve core is greater than the distance from the first limit rod 23 to the valve core, so that the valve core is limited by the first limit rod 23 during the fast injection. In this way, the opening requirements for different injection scenes can be met by one cartridge valve 1, thereby reducing the number of cartridge valves 1 used 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 when the injection scene is switched.

[0030] In this embodiment, for different usage scenarios, such as different types of die-casting machines, or different types of products, the speed and pressure requirements for fast injection and slow injection may be different. That is, in different usage scenarios, the initial distances of the first limit rod 23 and the second limit rod 24 from the valve core of the cartridge valve 1 may be different. In order to adapt to different usage scenarios, the initial positions of the first limit rod 23 and the second limit rod 24 need to be adjusted. There are many specific adjustment methods, such as manual adjustment or drive source adjustment.

[0031] In one specific example of manual adjustment, the first limit rod 23 and the adjustment assembly 3 can be threadedly connected to the valve body of the cartridge valve 1, and then the first limit rod 23 and the adjustment assembly 3 can be manually rotated to adjust the initial distances between the first limit rod 23 and the second limit rod 24 and the valve core respectively.

[0032] One specific example of driving source regulation is Figure 1 and Figure 2As shown, the double-limit electric regulating valve also includes a first drive device 21 and a second drive device 22. The second limit rod 24 connected to the adjustment component 3 is matched and connected with the second drive device 22 through the adjustment component 3, and the first drive device 21 is directly matched and connected with the first limit rod 23. The first drive device 21 and the second drive device 22 can adjust the initial distance from the corresponding limit rod to the valve core according to the opening requirement of the cartridge valve 1.

[0033] It should be known that both of the above methods can meet the requirements of this application, but in order to reduce labor intensity and ensure safety, the initial position adjustment of the limit rod is preferably adjusted by the drive source. There are many options for the specific types of the first drive device 21 and the second drive device 22, and motors, hydraulic cylinders, or air cylinders can be used. However, considering that hydraulic cylinders will increase the complexity of the oil circuit structure and that air cylinders need to be equipped with additional gas cylinders, motors are preferably used for the first drive device 21 and the second drive device 22.

[0034] Specifically, Figure 1 and Figure 2 As shown, for the position adjustment of the first limit rod 23, the first drive device 21 and the corresponding first limit rod 23 are directly threadedly connected, and the first limit rod 23 is limited in the circumferential direction, so that the first limit rod 23 is driven by the rotation of the first drive device 21 to move axially to adjust the distance between it and the valve core.

[0035] It should be known that there are many ways for the first limit rod 23 to be limited in the circumferential direction. It can be matched with the valve body of the cartridge valve 1, or it can be matched through an additional limit structure. There are also many specific limit structures. Taking the cooperation between the first limit rod 23 and the valve body as an example, the first limit rod 23 and the valve body can be splined, or the first limit rod 23 can adopt a non-circular cross-section structure and slide with the valve body. The specific choice can be made according to the actual needs of those skilled in the art. The specific method for adjusting the initial position of the second limit rod 24 may be related to the specific structure of the adjustment component 3. For the sake of ease of understanding, it will be described in detail below in conjunction with the specific structure of the adjustment component 3; there are many specific structures of the adjustment component 3, which will be described in detail below through two specific examples.

[0036] Example 1: like Figure 1 and Figure 2As shown, the regulating assembly 3 includes a regulating oil cylinder 31 and a reversing valve 32. The regulating oil cylinder 31 is connected to the output end of the second driving device 22, and the second limiting rod 24 is connected to the piston of the regulating oil cylinder 31. When slow injection is required, the reversing valve 32 can deliver the pumped oil to the rodless chamber of the regulating oil cylinder 31, and at the same time, the oil in the rod chamber of the regulating oil cylinder 31 flows back to the oil tank through the reversing valve 32, so that the second limiting rod 24 can limit the valve core to the maximum. When fast injection is required, the reversing valve 32 can be reversed, so that the pumped oil is delivered to the rod chamber of the regulating oil cylinder 31, and at the same time, the oil in the rodless chamber of the regulating oil cylinder 31 flows back to the oil tank through the reversing valve 32, so that the second limiting rod 24 moves away from the valve core to release the limit on the valve core.

[0037] It should be known that the capacity of the regulating oil cylinder 31 is small, which can realize the rapid movement of the piston, thereby quickly adjusting the second limit rod 24. The specific structure and working principle of the reversing valve 32 are well known to those skilled in the art, so they will not be elaborated in detail here.

[0038] In this example, the initial distance between the second limit rod 24 and the valve core is adjusted for different scenarios. Figure 1 and Figure 2 As shown, the regulating oil cylinder 31 is threadedly connected to the output end of the second driving device 22 through the first connecting rod 311. The regulating oil cylinder 31 or the first connecting rod 311 is limited in the circumferential direction, so that the regulating oil cylinder 31 drives the second limiting rod 24 to move vertically under the rotation of the second driving device 22, thereby adaptively adjusting the opening of the cartridge valve 1 in different slow injection scenarios.

[0039] It should be known that there are various circumferential limiting methods corresponding to the adjusting cylinder 31 or the first connecting rod 311. It is preferred to use an additional limiting structure to limit the adjusting 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 to a non-circular cross-section structure, and then the first connecting rod 311 can be passed through a limiting sleeve of a corresponding shape to achieve circumferential limiting.

[0040] Example 2: like Figure 3 and Figure 4As shown, the adjustment assembly 3 includes an adjustment seat 33 and an adjustment sleeve 34. The adjustment seat 33 is connected to the second drive device 22 through a second connecting rod 331, the adjustment sleeve 34 is sleeved and matched with the adjustment seat 33 and connected through a traction structure, the second limit rod 24 is fixedly connected to the adjustment sleeve 34, and the second limit rod 24 is limited in the circumferential direction with the cartridge valve 1. When slow injection is performed, the adjustment seat 33 and the adjustment sleeve 34 are axially limited by the traction structure, so that the initial spacing between the second limit rod 24 and the valve core is locked, thereby realizing the limit of the valve core under slow injection. When fast injection is required, the adjustment seat 33 is driven by the second drive device 22 to rotate a set angle, so that the adjustment seat 33 and the adjustment sleeve 34 are transformed from the axial limit fit to the sliding fit of the axial set distance through the traction structure, so that the second limit rod 24 is free to move in the axial direction to release the limit of the valve core.

[0041] In this example, Figure 3 and Figure 4 As shown, the traction structure includes a traction groove 340 and a traction block 332; the traction groove 340 is arranged on the adjustment seat 33, and the traction block 332 is arranged on the adjustment sleeve 34; or, the traction groove 340 is arranged on the adjustment sleeve 34, and the traction block 332 is arranged on the adjustment seat 33. The specific arrangement 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 sake of easy understanding, the following will take the traction groove 340 arranged on the adjustment sleeve 34, and the traction block 332 arranged on the adjustment seat 33 as an example for detailed description.

[0042] Specifically, Figure 4 As shown, the traction groove 340 includes an axial groove section 3402 and a circumferential groove section 3401, wherein the axial groove section 3402 extends along the axial direction of the adjustment sleeve 34, and the circumferential groove section 3401 extends along the circumferential direction of the adjustment sleeve 34; the circumferential groove section 3401 is connected to the 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 adjustment 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 rotation of the second driving device 22, so that the relative vertical sliding of the traction block 332 along the axial groove section 3402 can release the limiting of the valve core by the second limiting rod 24.

[0043] It is understandable that when performing rapid injection, the traction block 332 will slide along the axial groove section 3402 to one end close to the second limit rod 24; then in order to ensure the normal progress of the next die-casting process, the traction block 332 needs to be reset to the position of the circumferential groove section 3401 after completing the current rapid injection so as to limit the opening of the cartridge valve 1 for the slow injection of the next die-casting process. There are many ways to reset the traction block 332 after completing the rapid injection. For ease of understanding, two specific ways will be described in detail below.

[0044] Method 1: The adjusting sleeve 34 or the second limiting rod 24 connected to the adjusting sleeve 34 is elastically installed; for example, the adjusting sleeve 34 and the valve body are elastically connected and installed by a spring (not shown). Therefore, during rapid injection, the adjusting sleeve 34 can be moved in a direction away from the cartridge valve 1 by the extrusion of the valve core, and the spring connected to the adjusting sleeve 34 is in a stretched deformation state. After the rapid injection is completed, the cartridge valve 1 will be closed, and the adjusting sleeve 34 together with the second limiting rod 24 will move in a direction close to the cartridge valve 1 under the action of the spring's reset elastic force until the traction block 332 slides back to the intersection of the axial groove section 3402 and the circumferential groove section 3401, and 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 axial limiting of the adjusting seat 33 and the adjusting sleeve 34, so as to control the opening degree of the next slow injection process of die casting.

[0045] It should be noted that during rapid injection, the second limit rod 24 will always be against the valve core of the cartridge valve 1 under the action of the spring, so the elastic coefficient of the spring used for resetting the valve core in the cartridge valve 1 can be reduced, and the reduced part is compensated by the spring connected to the adjustment sleeve 34.

[0046] Method 2: Based on specific installation conditions, the double-limit electric regulating valve is installed vertically. Therefore, during rapid injection, the adjusting sleeve 34 can overcome gravity and move vertically upward in the direction away from the cartridge valve 1 by squeezing the valve core. After the rapid injection is completed, the cartridge valve 1 will be closed. At this time, the adjusting sleeve 34 and the second limit rod 24 will be reset and moved downward under the action of gravity, and then the traction block 332 will slide relatively along the axial groove section 3402 to the upper end close to the circumferential groove section 3401, and then the second drive device 22 can drive the adjusting seat 33 to drive the traction block 332 to slide into the circumferential groove section 3401 to achieve axial limitation of the adjusting seat 33 and the adjusting sleeve 34, so as to control the opening of the next slow injection process of die casting.

[0047] In this example, the initial distance between the second limit rod 24 and the valve core is adjusted for different scenarios. Figure 3 and Figure 4As shown, there are multiple traction grooves 340, and the multiple traction grooves 340 are arranged at intervals along the circumferential direction of the adjustment sleeve 34. The lengths of the axial groove sections 3402 corresponding to the multiple traction grooves 340 are different, and the circumferential groove sections 3401 corresponding to the multiple traction grooves 340 are flush and interconnected. Therefore, when the initial distance between the second limiting rod 24 and the valve core is adjusted, the adjustment seat 33 can drive the traction block 332 to slide along the circumferential groove section 3401 to the vicinity of the traction groove 340 close to the corresponding limiting condition under the rotation of the second driving device 22.

[0048] It should be known that the specific number of the traction grooves 340 and the length of the axial groove section 3402 corresponding to each traction groove 340 can be set according to the actual needs of those skilled in the art.

[0049] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached 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 limiting rod closest to the valve core is connected to the regulating assembly, so that when rapid injection is performed, the regulating assembly is suitable for releasing the limiting effect of the limiting rod connected thereto on the valve core.

2. The double-limit electric regulating valve according to claim 1, characterized in that: The dual-limit electric regulating valve also includes a first driving device and a second driving device; The limiting rod connected to the adjusting assembly is matched and connected with the second driving device through the adjusting assembly, and the first driving device is directly matched and connected with another limiting rod; The first driving device and the second driving device are suitable for adjusting the initial distance from the respective limiting rod to the valve core according to the opening requirement of the cartridge valve.

3. The double-limit electric regulating valve according to claim 2, characterized in that: 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 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 limiting rod can limit 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 limit rod releases the limit on the valve core.

4. The double-limit electric regulating valve according to claim 3, 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 limiting rod to move vertically under the driving of the second driving device, thereby adjusting the opening of the cartridge valve during slow injection.

5. The double-limit electric regulating valve according to claim 2, characterized in that: 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 limiting rod is connected to the adjusting sleeve, and the 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.

6. The double-limit electric regulating valve according to claim 5, 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 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 limiting rod can release the limiting of the valve core through the relative vertical sliding of the traction block along the axial groove section.

7. The double-limit electric regulating valve according to claim 6, characterized in that: The adjusting sleeve or the limiting rod connected to the adjusting sleeve is elastically installed so that when the cartridge valve is closed, the adjusting sleeve and the 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.

8. The double-limit electric regulating valve according to claim 6, 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 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.

9. The double-limit electric regulating valve according to claim 6, 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 sections corresponding to the multiple traction grooves have different lengths, and the horizontal groove sections corresponding to the multiple traction grooves are flush with each other and connected.

10. The double-limit electric regulating valve according to any one of claims 2 to 9, characterized in that: The first driving device is directly threadedly connected to the corresponding limiting rod, and the limiting rod is limited in the circumferential direction, so that the limiting rod moves axially under the driving of the first driving device to adjust the distance between the limiting rod and the valve core.

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