Main valve element structure and electromagnetic proportional valve

Abstract

The utility model discloses a main valve element structure and an electromagnetic proportional valve, and belongs to the technical field of electromagnetic proportional valves. The main valve element structure comprises a main valve element, a first opening cavity is formed in the main valve element, the main valve element is provided with a first outer circular ring face, a first conical face and a second outer circular ring face which are sequentially arranged, the diameter of the second outer circular ring face is smaller than that of the first outer circular ring face, and the first conical face is located between the first outer circular ring face and the second outer circular ring face. A liquid passing hole and an inserting hole are formed in the main valve element in the axial direction of the main valve element, the liquid passing hole is connected between the first opening cavity and the inserting hole, the inserting hole can be communicated with the outside of the main valve element, the inserting hole is used for positioning and clamping the main valve element, and the diameter of the inserting hole is larger than that of the liquid passing hole. According to the main valve element structure, the insertion hole used for clamping and positioning is formed, so that the two axial opposite ends of the main valve element are both in an abutting and clamping state, a grinding wheel does not need to be specially customized, the machining cost of the main valve element is low, and the machining difficulty of the main valve element can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic proportional valves, in particular to a main valve core structure and an electromagnetic proportional valve. Background Art

[0002] Currently, if Figure 1 and Figure 2 As shown, the main valve core 1' of the solenoid proportional valve is provided with a liquid hole 11' along its axial direction, and the main valve core 1' has a large outer annular surface 12', a first tapered surface 13' and a small outer annular surface 14'. The first tapered surface 13' is provided between the large outer annular surface 12' and the small outer annular surface 14'. In this case, two external cylindrical grinding center fixtures are required to respectively clamp the opposite ends of the main valve core 1' in the axial direction. That is, one external cylindrical grinding center fixture clamps the cavity 15' in the main valve core 1', and the other external cylindrical grinding center fixture is inserted into the liquid hole 11' to clamp the main valve core 1', so as to facilitate the processing of the large outer annular surface 12', the first tapered surface 13' and the small outer annular surface 14'.

[0003] The liquid hole 11 ′ is usually used as a damping hole. Therefore, in order to ensure the damping and throttling effect of the liquid hole 11 ′, the diameter of the liquid hole 11 ′ needs to be relatively small.

[0004] However, if Figure 1 and Figure 2 As shown, since the diameter of the liquid hole 11' is relatively small, during the process of inserting the external cylindrical grinding center fixture into the liquid hole 11' to clamp the main valve core 1', the diameter of the liquid hole 11' becomes larger or even damaged due to the insertion and processing, thereby affecting the damping and throttling effect of the liquid hole 11', and the damping and throttling effect of the liquid hole 11' cannot be guaranteed.

[0005] In order to solve the above problems, usually the end of the main valve core 1' where the liquid hole 11' is provided is not provided with an external cylindrical grinding center fixture to be in a free state. Therefore, it is necessary to use a centerless grinding device including a customized molded grinding wheel to process the large outer circular annular surface 12', the first conical surface 13' and the small outer circular annular surface 14'; but the cost of the customized molded grinding wheel is high, which makes the processing cost of the main valve core 1' high; and, since the end of the main valve core 1' where the liquid hole 11' is provided is in a free state, the processing requirements of the centerless grinding device are high during the processing, which makes the processing of the main valve core 1' more difficult.

[0006] In view of the above problems, a main valve core structure and an electromagnetic proportional valve are urgently needed to solve the above problems. Utility Model Content

[0007] The purpose of the utility model is to propose a main valve core structure and an electromagnetic proportional valve, so that the processing cost of the main valve core is low, the processing difficulty of the main valve core can be reduced, and the damping and throttling function of the liquid hole can be ensured.

[0008] To achieve this purpose, the present invention adopts the following technical solutions:

[0009] A main valve core structure, comprising a main valve core, wherein a first opening cavity is formed inside the main valve core, and the main valve core has a first outer annular surface, a first conical surface, and a second outer annular surface arranged in sequence, wherein the diameter of the second outer annular surface is smaller than the diameter of the first outer annular surface, and the first conical surface is located between the first outer annular surface and the second outer annular surface;

[0010] The main valve core is provided with a liquid hole and a plug-in hole along its axial direction. The liquid hole is connected between the first opening cavity and the plug-in hole. The plug-in hole can be communicated with the outside of the main valve core. The plug-in hole is used to position and clamp the main valve core. The diameter of the plug-in hole is larger than the diameter of the liquid hole.

[0011] As an optional solution, the ratio of the diameter of the plug hole to the diameter of the liquid hole is at least greater than or equal to 2, and the ratio of the axial length of the plug hole to the axial length of the liquid hole is not greater than 1 / 2.

[0012] As an optional solution, the end of the plug-in hole away from the liquid hole is connected to a first conical hole, and the first conical hole is connected to the outside of the main valve core. The diameter of the first conical hole gradually decreases along the axial direction of the main valve core and in the direction close to the plug-in hole.

[0013] As an optional solution, a second tapered hole is connected between the liquid passage hole and the plug hole.

[0014] As an optional solution, a plurality of the first outer annular surfaces are provided, and the plurality of the first outer annular surfaces are arranged at intervals along the axial direction of the main valve core, and an annular groove is formed between two adjacent first outer annular surfaces.

[0015] Solenoid proportional valve, including:

[0016] Electromagnet assembly;

[0017] A hydraulic component includes a main valve sleeve, a pilot valve core and the main valve core structure as described above, wherein the main valve sleeve is connected to one end of the electromagnet assembly, and a second opening cavity is formed inside the main valve sleeve. The main valve core is axially slidably arranged in the second opening cavity, and at least part of the pilot valve core gap is arranged in the first opening cavity. The electromagnet assembly is used to drive the pilot valve core to move axially along the main valve core in the first opening cavity, and the pilot valve core is provided with a through groove that passes through the axial direction of the main valve core, and the through groove is used to connect the first opening cavity and the second opening cavity along the axial direction of the main valve core.

[0018] As an optional solution, the main valve sleeve is respectively provided with a liquid inlet, a liquid outlet and a valve port, the valve port is located between the liquid inlet and the liquid outlet, the liquid inlet is communicated with the second opening cavity, and the main valve core is provided with a connecting hole along its radial direction, the connecting hole communicating the first opening cavity with the second opening cavity along the radial direction of the main valve core;

[0019] The first outer annular surface abuts against the inner wall surface of the second opening cavity, the first conical surface is used to abut against the valve port, and the second outer annular surface abuts against the inner wall surface of the liquid outlet.

[0020] As an optional solution, a third tapered hole is connected to one end of the liquid passage hole away from the plug hole, the third tapered hole is in communication with the first opening cavity, and the diameter of the third tapered hole gradually decreases along the axial direction of the main valve core and in the direction close to the plug hole;

[0021] The pilot valve core has a second tapered surface, and the second tapered surface can be fitted and inserted into the third tapered hole.

[0022] As an optional solution, the electromagnet assembly includes:

[0023] A magnetic conductive sleeve and a coil, wherein the magnetic conductive sleeve is connected to the main valve sleeve, the coil is arranged on the magnetic conductive sleeve, and a copper weld is formed on the magnetic conductive sleeve;

[0024] A movable iron is arranged in the magnetic sleeve and slides along the axial direction of the main valve core, and one end of the movable iron is connected to the pilot valve core;

[0025] A first limiting member and an elastic member, one end of the first limiting member is connected to the magnetic sleeve, one end of the elastic member abuts against the other end of the first limiting member, and the other end of the elastic member is limited in the moving iron and abuts against the inner side surface of the moving iron.

[0026] As an optional solution, the electromagnet assembly further includes:

[0027] a lubricating member, provided in the radial gap between the magnetic conductive sleeve and the moving iron;

[0028] A second limit member, a third limit member and a fourth limit member, the second limit member is sleeved on the movable iron and abuts against one end of the lubricating member, the third limit member is sleeved on the movable iron and abuts against the second limit member, the third limit member is connected to the magnetic sleeve, the fourth limit member is sleeved on the movable iron and abuts against one side of the main valve sleeve, and the fourth limit member is used to limit the moving position of the main valve core along its axial direction.

[0029] The beneficial effects of the utility model are:

[0030] By forming a first opening cavity inside the main valve core, and providing a liquid hole and a plug hole along the axial direction of the main valve core, the liquid hole is connected between the first opening cavity and the plug hole, and the plug hole is communicated with the outside of the main valve core, the plug hole is used to position and clamp the main valve core, and the diameter of the plug hole is larger than the diameter of the liquid hole; by clamping an outer cylindrical grinding center clamp in the first opening cavity of the main valve core, and inserting another outer cylindrical grinding center clamp into the plug hole outside the liquid hole to clamp the main valve core without inserting into the liquid hole, that is, the two outer cylindrical grinding center clamps are respectively pressed against the opposite ends of the axial direction of the main valve core, thereby facilitating the processing of the outer annular surface and the first conical surface and small outer annular surface; since the two opposite ends of the main valve core are in a tightly clamped state, there is no need to use processing equipment including customized grinding wheels to process the large outer annular surface, the first conical surface and the small outer annular surface. Only conventional grinding wheels are needed, and no special customized grinding wheels are required, which makes the processing cost of the main valve core lower; and there is no need for high processing requirements for processing equipment during the processing, so as to reduce the difficulty of processing the main valve core; at the same time, since the outer cylindrical grinding center fixture will not be inserted into the liquid hole, the aperture of the liquid hole can be prevented from becoming larger or even damaged, thereby ensuring the damping and throttling function of the liquid hole.

[0031] Moreover, since the diameter of the plug-in hole is larger than the diameter of the liquid hole, on the one hand, it is convenient for the external cylindrical grinding center fixture to be plugged into the plug-in hole with a larger diameter, making the plug-in of the external cylindrical grinding center fixture simpler and more convenient; on the other hand, the diameter-changing separation between the plug-in hole and the liquid hole can further ensure that the external cylindrical grinding center fixture will not be inserted into the liquid hole, thereby better ensuring the damping and throttling function of the liquid hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a cross-sectional view of the main valve core in the prior art;

[0033] Figure 2 yes Figure 1 Schematic diagram of the local enlarged structure at C in the middle;

[0034] Figure 3 This is a structural diagram of the main valve core provided by the utility model;

[0035] Figure 4 This is a cross-sectional view of the main valve core provided by the utility model;

[0036] Figure 5 yes Figure 4 Schematic diagram of the local enlarged structure at D in the middle;

[0037] Figure 6 This is a schematic diagram of the structure of the electromagnetic proportional valve provided by the utility model Figure 1 ;

[0038] Figure 7 This is a schematic diagram of the structure of the electromagnetic proportional valve (excluding the coil) provided by the utility model Figure 2 ;

[0039] Figure 8 This is a cross-sectional view of the electromagnetic proportional valve provided by the utility model;

[0040] Figure 9 yes Figure 8 Schematic diagram of the local enlarged structure at F in the middle;

[0041] Figure 10 yes Figure 8 Schematic diagram of the local enlarged structure at E in the middle.

[0042] Description of reference numerals:

[0043] 1'-main valve core; 11'-liquid hole; 12'-large outer annular surface; 13'-first conical surface; 14'-small outer annular surface; 15'-cavity;

[0044] 1-main valve core; 11-first opening cavity; 12-first outer annular surface; 121-annular groove; 13-first conical surface; 14-second outer annular surface; 15-liquid passage hole; 16-connection hole; 17-first conical hole; 18-second conical hole; 19-third conical hole; 10-connection hole;

[0045] 21-main valve sleeve; 211-liquid inlet; 212-liquid outlet; 214-second opening cavity;

[0046] 22-pilot valve core; 221-second conical surface;

[0047] 31-magnetic sleeve; 311-copper weld; 32-coil; 33-locking nut; 34-moving iron; 341-T-slot; 342-through hole; 35-first limiter; 351-mounting plate; 352-guide column; 36-elastic member; 37-lubricating member; 381-second limiter; 382-third limiter; 383-fourth limiter. DETAILED DESCRIPTION

[0048] All features disclosed in this specification, or all steps in the disclosed methods or processes, except mutually exclusive features and / or steps, can be combined in any manner.

[0049] Any feature disclosed in this specification, unless otherwise stated, may be replaced by an equivalent or similar alternative feature. That is, unless otherwise stated, each feature is merely an example of a set of equivalent or similar features. Throughout this specification, like reference numerals refer to like elements.

[0050] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the present invention are further explained below with reference to the accompanying drawings and through specific implementation methods.

[0051] Example

[0052] In this embodiment, a main valve core structure is proposed. The processing of the main valve core structure is relatively simple and convenient, and the processing cost is low. After the processing is completed, the main valve core structure will not be deformed or even have oil blockage problems, thereby ensuring the normal performance of the main valve core structure.

[0053] Specifically, if Figures 3 to 5 As shown, the main valve core structure includes a main valve core 1, and a first opening cavity 11 is provided inside the main valve core 1. The main valve core 1 has a first outer annular surface 12, a first conical surface 13 and a second outer annular surface 14 arranged in sequence. The diameter of the second outer annular surface 14 is smaller than the diameter of the first outer annular surface 12, and the first conical surface 13 is located between the first outer annular surface 12 and the second outer annular surface 14; and the main valve core 1 is provided with a liquid hole 15 and a plug hole 16 along its axial direction. The liquid hole 15 is connected between the first opening cavity 11 and the plug hole 16, that is, the liquid hole 15 is communicated with the first opening cavity 11 and the plug hole 16 respectively, and the plug hole 16 can be communicated with the outside of the main valve core 1, and the plug hole 16 is used to position and clamp the main valve core 1, and the diameter of the plug hole 16 is larger than the diameter of the liquid hole 15. Among them, the axial direction of the main valve core 1 is specifically as follows Figure 4 As shown by arrow A in FIG.

[0054] Compared with the prior art, the main valve core structure in this embodiment is provided with a plug hole 16 on the outside of the liquid hole 15, so that the diameter of the plug hole 16 is larger than the diameter of the liquid hole 15, and the plug hole 16 is communicated with the outside of the main valve core 1; by clamping an outer cylindrical grinding center clamp in the first opening cavity 11 of the main valve core 1, and inserting another outer cylindrical grinding center clamp into the plug hole 16 located outside the liquid hole 15 to clamp the main valve core 1 without inserting into the liquid hole 15, that is, the two outer cylindrical grinding center clamps respectively press against the opposite ends of the axial direction of the main valve core 1, thereby facilitating the processing of the outer annular surface, the first tapered surface 13 and the small outer annular surface; The two opposite ends of the main valve core 1 in the axial direction are in a tightly clamped state. Therefore, there is no need to use processing equipment including customized grinding wheels to process the large outer annular surface, the first conical surface 13 and the small outer annular surface. Only conventional grinding wheels are needed, and no special customized grinding wheels are required, so that the processing cost of the main valve core 1 is low; and there is no need to have high processing requirements for the processing equipment during the processing, so as to reduce the processing difficulty of the main valve core 1; at the same time, since the outer cylindrical grinding center fixture will not be inserted into the liquid hole 15, the aperture of the liquid hole 15 can be prevented from becoming larger or even damaged, thereby ensuring the damping and throttling function of the liquid hole 15.

[0055] It is worth noting that the above-mentioned cylindrical grinding center fixture, grinding wheel and processing equipment are all common surface processing components in the prior art, and their specific structures and working principles are no longer described in detail here.

[0056] Furthermore, by making the diameter of the insertion hole 16 larger than the diameter of the liquid passage hole 15, on the one hand, it is easier to insert the external cylindrical grinding center fixture into the larger diameter insertion hole 16, making the insertion of the external cylindrical grinding center fixture simpler and more convenient. On the other hand, the diameter reduction between the insertion hole 16 and the liquid passage hole 15 further ensures that the external cylindrical grinding center fixture will not be inserted into the liquid passage hole 15, thereby better ensuring the damping and throttling function of the liquid passage hole 15. Specifically, the diameter of the liquid passage hole 15 can be 0.3 mm to 0.5 mm, and the diameter of the insertion hole 16 can be larger than the diameter of the liquid passage hole 15.

[0057] Furthermore, the ratio of the diameter of the connecting hole 16 to the diameter of the liquid hole 15 is at least greater than or equal to 2, so that the diameter of the liquid hole 15 will not be too small, so as to ensure the damping and throttling effect of the liquid hole 15; moreover, the diameter of the connecting hole 16 can be made more appropriate, thereby ensuring the fixed plug-in effect between the external cylindrical grinding center fixture and the connecting hole 16, and then ensuring a better clamping effect on the main valve core 1.

[0058] Moreover, the ratio of the axial length of the plug hole 16 to the axial length of the liquid hole 15 is not greater than 1 / 2, so that the axial length of the liquid hole 15 will not be too long, thereby ensuring the damping and throttling effect of the liquid hole 15, and making the damping and throttling effect of the liquid hole 15 better; and, the axial length of the plug hole 16 will not be too short, thereby ensuring the fixed plug-in effect between the outer cylindrical grinding center fixture and the plug hole 16, and ensuring a better clamping effect on the main valve core 1.

[0059] Specifically, if Figures 3 to 5 As shown, the end of the plug hole 16 away from the liquid hole 15 is connected to the first tapered hole 17, and the first tapered hole 17 is connected to the outside of the main valve core 1. Along the axial direction of the main valve core 1 and in the direction close to the plug hole 16, the diameter of the first tapered hole 17 gradually decreases.

[0060] By setting the first tapered hole 17, on the one hand, it can provide a guide for the insertion of the external cylindrical grinding center clamp, which is conducive to the external cylindrical grinding center clamp being inserted into the insertion hole 16 more simply and accurately; on the other hand, it can make the first tapered hole 17 and the tapered part of the external cylindrical grinding center clamp be inserted and fit together, thereby ensuring that the external cylindrical grinding center clamp is inserted tightly in the insertion hole 16, and further ensuring that the clamping effect of the main valve core 1 is relatively stable.

[0061] Furthermore, if Figure 4 and Figure 5 As shown, a second tapered hole 18 is connected between the liquid passage hole 15 and the plug hole 16, that is, the second tapered hole 18 is connected to the liquid passage hole 15 and the plug hole 16 respectively, so as to realize a transition connection between the liquid passage hole 15 and the plug hole 16 of different diameters, avoiding the problem of breakage or even detachment at the connection position between the liquid passage hole 15 and the plug hole 16, thereby ensuring that the connection between the liquid passage hole 15 and the plug hole 16 is relatively stable.

[0062] Specifically, if Figure 3 and Figure 4 As shown, a plurality of first outer annular surfaces 12 are provided, and the plurality of first outer annular surfaces 12 are spaced apart along the axial direction of the main valve core 1. An annular groove 121 is formed between two adjacent first outer annular surfaces 12 to provide a space for oil to flow through the annular groove 121. In this embodiment, there are five first outer annular surfaces 12, and correspondingly, there are four annular grooves 121.

[0063] The main valve core structure in this embodiment adds a plug-in hole 16 on the outer side of the liquid hole 15 to provide a clamping and positioning function through the plug-in hole 16, so that the main valve core 1 can be clamped through the plug-in hole 16 without damaging the damping and throttling function of the liquid hole 15, so that the main valve core 1 is in a clamped state at both opposite ends along its axial direction, thereby facilitating the processing of the first outer annular surface 12, the first conical surface 13 and the second outer annular surface 14, and the processing is simple and convenient, and the processing cost is low.

[0064] Application Examples

[0065] This application example provides an electromagnetic proportional valve, which includes an electromagnet component and a hydraulic component; wherein, Figures 6 to 8 As shown, the hydraulic assembly includes a main valve sleeve 21, a pilot valve core 22, and the main valve core structure described in the first embodiment. The main valve sleeve 21 is connected to one end of the electromagnet assembly. A second opening cavity 214 is formed inside the main valve sleeve 21. The main valve core 1 slides axially within the second opening cavity 214. At least a portion of the pilot valve core 22 is spaced apart within the first opening cavity 11. The electromagnet assembly is used to drive the pilot valve core 22 to move axially within the first opening cavity 11 along the main valve core 1. The pilot valve core 22 is provided with a through groove extending axially along the main valve core 1. The through groove is used to connect the first opening cavity 11 with the second opening cavity 214 along the axial direction of the main valve core 1. The electromagnetic proportional valve is suitable for use in lifting or rotating mechanisms in aerial work vehicles, electric forklifts, automated guided vehicles (AGVs), tractors, and harvesters to achieve load retention, vertical movement, and speed control of work platforms and agricultural machinery attachments within the lifting or rotating mechanisms, or to control the rotational speed of agricultural attachments.

[0066] By setting a through groove connecting the first opening cavity 11 and the second opening cavity 214 along the axial direction of the main valve core 1, that is, the left and right ends of the pilot valve core 22 can be connected through the through groove, so that the pressure of the oil at the left and right ends of the pilot valve core 22 can be consistent, thereby ensuring the axial movement stability of the pilot valve core 22 along the main valve core 1.

[0067] Furthermore, if Figures 6 to 8 As shown, the main valve sleeve 21 is respectively provided with a liquid inlet 211, a liquid outlet 212 and a valve port. The valve port is located between the liquid inlet 211 and the liquid outlet 212. The liquid inlet 211 is connected to the second opening cavity 214. The main valve core 1 is provided with a connecting hole 10 along its radial direction. The connecting hole 10 connects the first opening cavity 11 and the second opening cavity 214 along the radial direction of the main valve core 1. In addition, the first outer annular surface 12 abuts against the inner wall surface of the second opening cavity 214, the first conical surface 13 is used to abut against the valve port, and the second outer annular surface 14 abuts against the inner wall surface of the liquid outlet 212. The radial direction of the main valve core 1 is specifically as follows: Figure 4 As shown by arrow B in FIG.

[0068] By making the first outer annular surface 12 of the main valve core 1 abut against the inner wall surface of the second opening cavity 214 of the main valve sleeve 21, the first conical surface 13 of the main valve core 1 abut against the valve port of the main valve sleeve 21, and the second outer annular surface 14 of the main valve core 1 abut against the inner wall surface of the liquid outlet 212 of the main valve sleeve 21, it is possible to ensure that the sealing effect between the main valve core 1 and the main valve sleeve 21 is better, thereby ensuring that the entire electromagnetic proportional valve has a lower oil leakage.

[0069] Specifically, if Figure 4 、 Figure 5 and Figure 9 As shown, the end of the liquid hole 15 away from the plug-in hole 16 is connected to the third tapered hole 19, and the third tapered hole 19 is communicated with the first opening cavity 11. The diameter of the third tapered hole 19 gradually decreases along the axial direction of the main valve core 1 and in the direction close to the plug-in hole 16; and the pilot valve core 22 has a second tapered surface 221, which can be fitted and plugged into the third tapered hole 19.

[0070] like Figure 9 As shown, by making the second conical surface 221 of the pilot valve core 22 fit and be inserted into the third conical hole 19 of the main valve core 1, a conical sealing structure is formed between the pilot valve core 22 and the main valve core 1, so as to ensure a better sealing effect between the main valve core 1 and the pilot valve core 22, thereby better ensuring that the entire electromagnetic proportional valve has a lower oil leakage.

[0071] Furthermore, if Figures 6 to 8 As shown, the electromagnet assembly includes a locking nut 33, a magnetic sleeve 31, a coil 32, a moving iron 34, a first limiter 35 and an elastic member 36; wherein the magnetic sleeve 31 is connected to the main valve sleeve 21, the locking nut 33 is threadedly connected to the magnetic sleeve 31 and pressed against one side of the coil 32 to fix the coil 32 to the magnetic sleeve 31, and a copper weld 311 with a magnetic isolation effect is welded on the magnetic sleeve 31; the moving iron 34 is arranged in the magnetic sleeve 31 and slides along the axial direction of the main valve core 1. One end of the iron 34 is connected to the pilot valve core 22, so that the movable iron 34 can drive the pilot valve core 22 to move synchronously. That is, one end of the pilot valve core 22 is inserted into the T-slot 341 of the movable iron 34 to achieve the connection between the movable iron 34 and the pilot valve core 22. One end of the first limiter 35 is fixedly connected to the magnetic sleeve 31, and one end of the elastic member 36 abuts the other end of the first limiter 35. The other end of the elastic member 36 is limited within the movable iron 34 and abuts the inner side surface of the movable iron 34. In this embodiment, the elastic member 36 can be specifically a spring. The magnetic sleeve 31 and the main valve sleeve 21 are threadedly connected as a whole. The locking nut 33, the movable iron 34, and the magnetic sleeve 31 are all made of magnetic conductive materials.

[0072] like Figure 8As shown, by welding a copper weld 311 with a magnetic isolation effect on the magnetic sleeve 31, the non-magnetic copper weld 311 can redistribute the magnetic flux lines generated by the coil 32 when it is energized. This can distribute the axial and radial magnetic induction intensity of the main valve core 1, ensuring that the electromagnetic force generated by the interaction between the coil 32 and the magnetic sleeve 31 does not change with the movement position of the movable iron 34, thereby ensuring the stability of the generated electromagnetic force. The specific working principle of the electromagnetic proportional valve in this embodiment can refer to the working principle of existing electromagnetic proportional valves.

[0073] Specifically, if Figure 8 As shown, the first retaining member 35 includes a mounting plate 351 and a guide post 352. The mounting plate 351 and the guide post 352 are perpendicularly connected to form a T-shaped first retaining member 35. The mounting plate 351 is fixedly connected to the magnetic conductive sleeve 31. One end of the elastic member 36 is sleeved on the guide post 352 and abuts against the mounting plate 351. Simultaneously, a placement cavity is formed within the movable iron 34. The other end of the elastic member 36 is positioned within the placement cavity and abuts against the inner wall of the placement cavity. The mounting plate 351 and the guide post 352 are integrally formed.

[0074] Specifically, if Figure 8 As shown, a through hole 342 is provided in the movable iron 34. The through hole 342 communicates with the placement cavity. Both the through hole 342 and the placement cavity extend axially through the movable iron 34 along the main valve core 1, thereby allowing the through hole 342 and the placement cavity to communicate with the left and right sides of the movable iron 34. This prevents the cavity on the left side of the movable iron 34 from being sealed, which could cause performance abnormalities of the entire electromagnetic proportional valve, thereby effectively ensuring the normal performance of the electromagnetic proportional valve. The diameter of the through hole 342 is smaller than the inner diameter of the placement cavity, and the through hole 342 communicates with the T-slot 341 of the movable iron 34. The T-slot 341 has an opening.

[0075] Furthermore, if Figure 8 and Figure 10As shown, the electromagnet assembly also includes a lubricating member 37, a second limiting member 381, a third limiting member 382 and a fourth limiting member 383; wherein the lubricating member 37 is arranged in the radial gap between the magnetic sleeve 31 and the moving iron 34, so as to reduce the friction between the magnetic sleeve 31 and the moving iron 34 and better protect the magnetic sleeve 31 and the moving iron 34; the second limiting member 381 is sleeved on the moving iron 34 and abuts against one end of the lubricating member 37, so as to provide an axial limiting blocking effect for the lubricating member 37 through the second limiting member 381; the third limiting member 382 is sleeved on the moving iron 34 and abuts against the third limiting member 383. The second limit member 381 and the third limit member 382 are fixedly connected to the magnetic sleeve 31, so that the third limit member 382 can provide an axial limiting blocking effect for the second limit member 381; the fourth limit member 383 is sleeved on the moving iron 34 and abuts against one side of the main valve sleeve 21, so that the fourth limit member 383 can limit the axial movement position of the main valve core 1, that is, the fourth limit member 383 is fixedly arranged at the opening of the second opening cavity 214, and the main valve core 1 can abut against the fourth limit member 383 when it moves along its axial direction, thereby realizing the design flow of the electromagnetic proportional valve.

[0076] It is worth noting that the above-mentioned lubricating part 37 can be specifically a lubricating cloth, which has a cylindrical structure and is arranged in the radial gap between the magnetic sleeve 31 and the moving iron 34; the second limiting part 381 and the fourth limiting part 383 can be specifically limiting rings, and the third limiting part 382 can be specifically an elastic retaining ring for the hole.

[0077] The specific working process of the solenoid proportional valve in this application example is as follows:

[0078] First, when the coil 32 is not energized, the coil 32 does not generate a magnetic field, so that no electromagnetic force is generated between the coil 32, the magnetic sleeve 31 and the moving iron 34. At this time, the second conical surface 221 of the pilot valve core 22 is fitted and inserted into the third conical hole 19 of the main valve core 1. At the same time, the first conical surface 13 of the main valve core 1 is pressed against the valve port of the main valve sleeve 21 to close the valve port; at the same time, the oil in the liquid inlet 211 flows into the first opening cavity 11 through the gap between the main valve core 1 and the main valve sleeve 21, as well as the second opening cavity 214 and the connecting hole 10.

[0079] Then, as the power-on signal gradually increases, the magnetic induction intensity generated by the coil 32 becomes larger and larger. When the electromagnetic force generated between the coil 32, the magnetic sleeve 31 and the moving iron 34 can overcome the elastic force of the elastic member 36, the moving iron 34 compresses the elastic member 36 along the axial direction and along the left side of the main valve core 1, so that the moving iron 34 drives the pilot valve core 22 to move synchronously along the left side, thereby reducing the oil pressure in the first opening cavity 11, while the oil pressure at the liquid inlet 211 is larger, so that there is a pressure difference between the first opening cavity 11 and the liquid inlet 211, so that the main valve core 1 moves to the left under the action of the pressure difference to open the valve port, so that the oil in the liquid inlet 211 passes through the valve port and flows out from the liquid outlet 212.

[0080] The above contents are merely preferred embodiments and application examples of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A main valve core structure, comprising a main valve core (1), wherein a first opening cavity (11) is formed inside the main valve core (1), and the main valve core (1) has a first outer annular surface (12), a first conical surface (13), and a second outer annular surface (14) arranged in sequence, wherein the diameter of the second outer annular surface (14) is smaller than the diameter of the first outer annular surface (12), and the first conical surface (13) is located between the first outer annular surface (12) and the second outer annular surface (14); characterized in that: The main valve core (1) is provided with a liquid passage hole (15) and a plug hole (16) along its axial direction. The liquid passage hole (15) is connected between the first opening cavity (11) and the plug hole (16). The plug hole (16) can be communicated with the outside of the main valve core (1). The plug hole (16) is used to position and clamp the main valve core (1). The diameter of the plug hole (16) is larger than the diameter of the liquid passage hole (15).

2. The main valve core structure according to claim 1, characterized in that: The ratio of the diameter of the plug hole (16) to the diameter of the liquid hole (15) is at least greater than or equal to 2, and the ratio of the axial length of the plug hole (16) to the axial length of the liquid hole (15) is not greater than 1 / 2.

3. The main valve core structure according to claim 1, characterized in that: The end of the plug hole (16) away from the liquid hole (15) is connected to a first tapered hole (17), and the first tapered hole (17) is connected to the outside of the main valve core (1). The diameter of the first tapered hole (17) gradually decreases along the axial direction of the main valve core (1) and in the direction close to the plug hole (16).

4. The main valve core structure according to claim 1, characterized in that: A second tapered hole (18) is connected between the liquid passage hole (15) and the plug hole (16).

5. The main valve core structure according to any one of claims 1 to 4, characterized in that: A plurality of the first outer annular surfaces (12) are provided, and the plurality of the first outer annular surfaces (12) are spaced apart along the axial direction of the main valve core (1), and an annular groove (121) is formed between two adjacent first outer annular surfaces (12).

6. Solenoid proportional valve, characterized in that, include: Electromagnet assembly; A hydraulic assembly, comprising a main valve sleeve (21), a pilot valve core (22) and a main valve core structure as described in any one of claims 1 to 5, wherein the main valve sleeve (21) is connected to one end of the electromagnet assembly, and a second opening cavity (214) is formed inside the main valve sleeve (21), and the main valve core (1) is axially slidably arranged in the second opening cavity (214), and at least part of the pilot valve core (22) is gap-arranged in the first opening cavity (11), and the electromagnet assembly is used to drive the pilot valve core (22) to move axially along the main valve core (1) in the first opening cavity (11), and the pilot valve core (22) is provided with a through groove extending axially along the main valve core (1), and the through groove is used to connect the first opening cavity (11) and the second opening cavity (214) along the axial direction of the main valve core (1).

7. The electromagnetic proportional valve according to claim 6, characterized in that: The main valve sleeve (21) is respectively provided with a liquid inlet (211), a liquid outlet (212) and a valve port, the valve port is located between the liquid inlet (211) and the liquid outlet (212), the liquid inlet (211) is communicated with the second opening cavity (214), the main valve core (1) is provided with a connecting hole (10) along its radial direction, the connecting hole (10) communicates the first opening cavity (11) with the second opening cavity (214) along the radial direction of the main valve core (1); The first outer annular surface (12) abuts against the inner wall surface of the second opening cavity (214), the first conical surface (13) is used to abut against the valve port, and the second outer annular surface (14) abuts against the inner wall surface of the liquid outlet (212).

8. The electromagnetic proportional valve according to claim 6, characterized in that: The end of the liquid passage hole (15) away from the plug hole (16) is connected to a third tapered hole (19), the third tapered hole (19) is communicated with the first opening cavity (11), and the diameter of the third tapered hole (19) gradually decreases along the axial direction of the main valve core (1) and in the direction close to the plug hole (16); The pilot valve core (22) has a second tapered surface (221), and the second tapered surface (221) can be fitted and inserted into the third tapered hole (19).

9. The electromagnetic proportional valve according to claim 6, characterized in that: The electromagnet assembly comprises: A magnetic conductive sleeve (31) and a coil (32), wherein the magnetic conductive sleeve (31) is connected to the main valve sleeve (21), the coil (32) is arranged on the magnetic conductive sleeve (31), and a copper weld (311) is formed on the magnetic conductive sleeve (31); A movable iron (34) is provided in the magnetic sleeve (31) and slides along the axial direction of the main valve core (1), and one end of the movable iron (34) is connected to the pilot valve core (22); A first limiting member (35) and an elastic member (36), wherein one end of the first limiting member (35) is connected to the magnetic conductive sleeve (31), one end of the elastic member (36) is abutted against the other end of the first limiting member (35), and the other end of the elastic member (36) is limited in the moving iron (34) and abutted against the inner side surface of the moving iron (34).

10. The electromagnetic proportional valve according to claim 9, characterized in that: The electromagnet assembly further comprises: a lubricating member (37) disposed in a radial gap between the magnetic conductive sleeve (31) and the moving iron (34); A second limiting member (381), a third limiting member (382) and a fourth limiting member (383), wherein the second limiting member (381) is sleeved on the movable iron (34) and abuts against one end of the lubricating member (37), the third limiting member (382) is sleeved on the movable iron (34) and abuts against the second limiting member (381), the third limiting member (382) is connected to the magnetic sleeve (31), the fourth limiting member (383) is sleeved on the movable iron (34) and abuts against one side of the main valve sleeve (21), and the fourth limiting member (383) is used to limit the moving position of the main valve core (1) along its axial direction.

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