Pressure compensation type electric control multi-way valve

Abstract

The invention discloses a pressure compensation type electric control multi-way valve. Comprising a valve body, and an oil inlet, an oil return port, a system overflow valve, a throwing lifting interface, a throwing plate far-end interface, a knife grinding interface, a throwing rotating first interface, a throwing rotating second interface, a header folding first interface, a header folding second interface, a feeding reversal interface, a throwing lifting reversing valve, a throwing plate reversing valve and a throwing rotating electromagnetic reversing valve which are arranged on the valve body, the cutting table folding electromagnetic reversing valve and the feeding reversing electromagnetic reversing valve are arranged on the valve body, an electromagnetic unloading valve, a two-position two-way electromagnetic reversing valve and a knife sharpening electromagnetic reversing valve are further arranged on the valve body, and the two pressure compensation valves are arranged in the valve body. The two pressure compensation valves are used for guaranteeing stability of oil inlet pressure of the throwing rotary electromagnetic reversing valve and stability of oil inlet pressure of the header folding electromagnetic reversing valve respectively, when header folding action and feeding reversing action are conducted, it is guaranteed that the actions are stable and smooth, and normal, stable and efficient work of the whole harvester is guaranteed.

Description

Technical Field

[0001] The invention belongs to an electrically controlled multi-way valve, and in particular relates to a pressure-compensated electrically controlled multi-way valve. Background Art

[0002] The existing wheeled harvesters all require hydraulic valves to control the actions of grain bin lifting, grass bin lifting, throwing lifting, throwing rotation and power clutch. Conventional hydraulic valves have a single function and are arranged in a scattered manner, occupying a relatively large installation space. In a Chinese patent application with publication number CN207598845U, a wheeled harvester is disclosed, including a hydraulic mechanical stepless speed change device, which includes a total power input shaft, a shunt mechanism, a confluence mechanism, a hydraulic speed regulating mechanism and a mechanical speed change mechanism; the shunt mechanism includes a first shunt gear and a second shunt gear, the first shunt gear is meshed with the second shunt gear, and the first shunt gear is fixedly connected to the total power input shaft; the hydraulic speed regulating mechanism includes a pump and a motor, and the input shaft of the pump is connected to the total power input shaft; the confluence mechanism is a planetary gear, and the planetary gear includes a sun gear, an inner gear ring and a planet carrier, the sun gear is connected to the output shaft of the motor, the inner gear ring is connected to or integrated with the second shunt gear, and the planet carrier is connected to the input shaft of the mechanical speed change mechanism.

[0003] In the actual working process, the harvester's grain bin lifting, hay bin lifting, throwing lifting, throwing rotation and cutting table folding actions all require multi-way valves to control. Many existing conventional actions usually distribute hydraulic driving force through solenoid valves to ensure control accuracy and convenience. However, in actual work, we found that when the cutting table folding action and feeding reversal action are performed through the electronically controlled multi-way valve, the action is often unstable and unsmooth, which seriously affects the normal, stable and efficient operation of the entire harvester. Summary of the invention

[0004] The purpose of the present invention is to provide a pressure-compensated electrically controlled multi-way valve, which overcomes the shortcomings of the prior art and ensures that the action is smooth and stable when the electrically controlled multi-way valve performs the harvesting table folding action and the feeding reversal action, thereby ensuring the normal, stable and efficient operation of the entire harvester.

[0005] The above technical purpose of the present invention is mainly solved by the following technical solutions: a pressure-compensated electrically controlled multi-way valve, including a valve body, an oil inlet, an oil return port, a system overflow valve, a throwing and lifting interface, a throwing plate remote interface, a sharpening interface, a throwing and rotating first interface, a throwing and rotating second interface, a cutting table folding first interface, a cutting table folding second interface, a feeding reversal interface, a throwing and lifting reversing valve for controlling the throwing and lifting interface, a throwing plate reversing valve for controlling the throwing and lifting remote interface, and a throwing and rotating first interface and a throwing and rotating second interface. The valve body is also provided with an electromagnetic unloading valve in parallel with the throwing lifting interface, a two-position two-way electromagnetic reversing valve in series with the far-end interface of the throwing plate, and a sharpening electromagnetic reversing valve for controlling the sharpening interface. It also includes two pressure compensation valves arranged in the valve body. The two pressure compensation valves are respectively used to ensure the stability of the oil inlet pressure of the throwing rotation electromagnetic reversing valve and the cutting platform folding electromagnetic reversing valve.

[0006] As a further preferred technical solution of the present invention, the pressure compensation valve includes a compensation valve core chamber arranged on the valve body, a compensation valve core arranged in the compensation valve core chamber, a boss arranged at the end of the compensation valve core, a compression spring arranged in the compensation valve core chamber away from the boss and applying elastic force to the compensation valve core, a first sealing plug screwed in the compensation valve core chamber close to the boss, and a second sealing plug screwed at the other end of the compensation valve core chamber, and a hydraulic control port connected to the oil inlet is provided between the boss and the first sealing plug.

[0007] As a further preferred technical solution of the present invention, the compensation valve core includes a valve core body, a flow ring groove provided on the valve core body, and a spring mounting rod close to the second sealing screw plug, and the compression spring is sleeved on the spring mounting rod.

[0008] As a further preferred technical solution of the present invention, the through-flow annular groove comprises an equal-diameter annular groove section and a tapered annular groove section, and the diameter of the tapered annular groove section A2 gradually decreases as it approaches the equal-diameter annular groove.

[0009] As a further preferred technical solution of the present invention, the spring mounting rod is a tapered rod whose diameter gradually decreases as it approaches the second sealing screw plug.

[0010] As a further preferred technical solution of the present invention, the valve body is further provided with a one-way throttle valve connected in series with the sharpening interface.

[0011] As a further preferred technical solution of the present invention, both the second sealing screw plug and the first sealing screw plug are provided with sealing rings.

[0012] As a further preferred technical solution of the present invention, the end surface of the boss is provided with a tapered hole penetrating into the compensation valve core and a plurality of radial opening grooves communicating with the tapered hole.

[0013] Beneficial effects:

[0014] By setting the pressure compensation valve, the electric-controlled multi-way valve can ensure smooth and steady movements when performing the header folding action and the feeding reversal action, thereby ensuring the normal, stable and efficient operation of the entire harvester. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 yes Figure 1 A schematic diagram of the structure from another perspective;

[0017] Figure 3 It is a structural cross-sectional view of the electromagnetic unloading valve in the present invention;

[0018] Figure 4 yes Figure 3 The structural diagram of the compensating valve core;

[0019] Figure 5 yes Figure 4 A structural cross-sectional view of the boss in FIG.

[0020] Figure 6 yes Figure 1 A structural cross-sectional view of the first sealing screw plug;

[0021] Figure 7 It is the hydraulic principle diagram of the present invention. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0023] like Figure 1-7As shown, a pressure-compensated electrically controlled multi-way valve comprises a valve body 1, an oil inlet P provided on the valve body 1, an oil return port T, a system overflow valve 2, a throwing and lifting interface A2, a throwing plate distal interface A1, a sharpening interface A3, a throwing and rotating first interface A4, a throwing and rotating second interface B4, a cutting platform folding first interface A5, a cutting platform folding second interface B5, a feeding reversal interface A6, a throwing and lifting reversing valve 3 for controlling the throwing and lifting interface A2, a throwing plate reversing valve 4 for controlling the throwing plate distal interface A1, a throwing and rotating electromagnetic reversing valve 5 for controlling the throwing and rotating first interface A4 and the throwing and rotating second interface B4, and a cutting platform folding first interface A5, a cutting platform folding second interface B5, a feeding reversing interface A6, a throwing and lifting reversing valve 3 for controlling the throwing and lifting interface A2, a throwing and lifting reversing valve 4 for controlling the throwing and lifting ... feeding reversing valve 3 for controlling the throwing and lifting interface A2, a throwing and lifting reversing valve 3 for controlling the throwing and lifting interface A2, a throwing and lifting reversing valve 4 for controlling the throwing and lifting The first folding interface A5 of the cutting table and the second folding interface B5 of the cutting table are provided with a cutting table folding electromagnetic reversing valve 6, and a feeding reversing electromagnetic reversing valve 7 for controlling the feeding reversing interface A6. The valve body 1 is also provided with an electromagnetic unloading valve 8 connected in parallel with the throwing and lifting interface A2, a two-position two-way electromagnetic reversing valve 9 connected in series with the far-end interface A1 of the throwing plate, and a knife sharpening electromagnetic reversing valve 12 for controlling the knife sharpening interface A3. The system overflow valve 2 is connected to the oil inlet P to control the system pressure of the entire electric control multi-way valve. The throwing and lifting reversing valve 3, the throwing plate reversing valve 4, and the knife sharpening electromagnetic reversing valve 12 are all two-position three-way electromagnetic reversing valves of purchased standard parts; the feeding reversing electromagnetic The reversing valve 7 is also a two-position two-way electromagnetic reversing valve, and the electromagnetic unloading valve 8 is a two-position two-way electromagnetic reversing valve. Because the above structures are all prior art, they are no longer described in detail in this embodiment. The applicant found in the actual application of the product that when the header folding action and the feeding reversal action are performed through the electric control multi-way valve, the action is often unstable and unsmooth, which seriously affects the normal, stable and efficient operation of the entire harvester. In response to this problem, the applicant invested a lot of personnel, time and funds to carry out targeted public relations research and development, and found that the cause of this problem is that when multiple electromagnetic reversing valves are in action, the change in flow causes the change in pressure. , which results in the phenomenon that the movements are often unstable and unsmooth during the folding action of the cutting table and the feeding reversal action. For this reason, the applicant improved the original structure by adding two pressure compensation valves 10 in the valve body. The two pressure compensation valves 10 are respectively used to ensure the stability of the oil inlet pressure of the throwing rotation electromagnetic reversing valve 5 and the cutting table folding electromagnetic reversing valve 6. Through the pressure compensation valve 10, the pressure of the hydraulic oil entering the cutting table folding action and the feeding reversal action is compensated and stabilized, thereby ensuring the pressure of the hydraulic oil entering therein is stable, thereby ensuring the smoothness of the corresponding action and ensuring the normal and efficient operation of the entire harvester.

[0024] In this embodiment, the pressure compensation valve 10 includes a compensation valve core chamber 1001 provided on the valve body 1, a compensation valve core 1002 provided in the compensation valve core chamber 1001, a boss 1003 provided at the end of the compensation valve core 1002, a compression spring 1004 provided in the compensation valve core chamber 1001 away from the boss 1003 and applying elastic force to the compensation valve core 1002, a first sealing screw plug 1005 screwed in the compensation valve core chamber 1001 close to the boss 1003, and a second sealing screw plug 1006 screwed in the other end of the compensation valve core chamber 1001, and there is an oil inlet between the boss 1003 and the first sealing screw plug 1005. The hydraulic control port K communicated with the port P, the compensation valve core cavity 1001 runs through the entire valve body 1, and is provided with threaded ports at both ends for installing the first sealing plug 1005 and the second sealing plug 1006. In order to maintain the seal and prevent oil leakage, the second sealing plug 1006 and the first sealing plug 1005 are respectively provided with sealing rings 1007, and the compensation valve core 1002 is installed in the compensation valve core cavity 1001 with a clearance fit and can slide. The compression spring 1004 is used to apply elastic force to the compensation valve core 1002; the presence of the boss 1003 ensures that the hydraulic oil coming in from the oil inlet P can push the compensation valve core 1002. Of course, the compression spring 1004 is located at At the other end of the hydraulic control port K, the hydraulic control port is formed by the gap between the boss 1003 and the first sealing plug 1005, and is connected to the oil inlet P through the process hole. Furthermore, the compensation valve core 1002 includes a valve core body 10021, a flow ring groove 10022 provided on the valve core body 10021, and a spring mounting rod 10023 close to the second sealing plug 1006. The compression spring 1004 is sleeved on the spring mounting rod 10023. The presence of the flow ring groove forms a sealing valve core section located at both ends of the flow ring groove on the valve core body, thereby realizing the control of the oil inlet opening size of the oil inlet P. With such a structure, when the liquid entering from the oil inlet P When the pressure oil fluctuates, for example, when the flow rate decreases, the pressure of the hydraulic oil entering through the hydraulic control port K on the compensation valve core 1002 will decrease. Under the elastic force of the compression spring 1004, the compensation valve core will move toward the hydraulic control port K, causing the oil inlet opening at the oil inlet port P to become smaller, thereby increasing the pressure and ensuring the stability of the pressure. Conversely, when the flow rate increases, the pressure of the hydraulic oil entering through the hydraulic control port K on the compensation valve core 1002 will increase, which can overcome the elastic force of the compression spring 1004 acting on the compensation valve core, and the compensation valve core will move away from the hydraulic control port K, causing the oil inlet opening at the oil inlet port P to become larger, thereby reducing the pressure and ensuring the stability of the pressure.

[0025] Furthermore, in order to make the pressure compensation more stable, the through-flow annular groove 10022 includes an equal-diameter annular groove section 100221 and a conical annular groove section 100222. The diameter of the conical annular groove section A2 gradually decreases as it approaches the equal-diameter annular groove. The hydraulic oil coming in from the oil inlet P contacts the conical annular groove section 100222 and diffuses in a dispersed manner, which is conducive to pressure stability.

[0026] Furthermore, the end face of the boss 1003 is provided with a tapered hole 10031 penetrating into the compensation valve core and a plurality of radial opening grooves 10032 communicating with the tapered hole 10031. Such a structure enables the hydraulic oil entering the hydraulic control port K to act on the compensation valve core 1002 as evenly as possible, thereby ensuring stable pressure during operation.

[0027] Furthermore, the spring mounting rod 10023 is a tapered rod whose diameter gradually decreases as it approaches the second sealing screw plug 1006. At the same time, a pressure-assisted stabilizing mechanism 10024 is provided on the second sealing screw plug 1006. The pressure-assisted stabilizing mechanism is evenly distributed in three directions around the axis on the second sealing screw plug. The pressure-assisted stabilizing mechanism includes a mounting hole 100241 provided on the second sealing screw plug 1006, a plurality of radial rectangular holes 100242 communicating with the mounting holes, a radial circular hole 100243 communicating with the radial rectangular holes, a guide rod 100244 provided in the radial rectangular hole 100243, a guide ring 100245 located in the radial circular hole and connected to the guide rod, a center column 100246 connected to the guide ring, an auxiliary spring 100247 sleeved on the center column, an end screw plug 100248 screwed at the end of the radial rectangular hole, and a screw plug 100249 connected to the end of the guide rod. The arc plate 100249, the arc plate and the spring mounting rod are fitted together. Because the compensation valve core chamber 1001 where the second sealing screw plug 1006 is located is a low-pressure chamber, the pressure it bears is very small. The reason for setting a pressure auxiliary stabilization mechanism is to further maintain the pressure stability during pressure compensation, that is, to make the compensation valve core as stable as possible when sliding in the compensation valve core chamber. The spring mounting rod 10023 is a conical rod, and the arc plate and the spring mounting rod are fitted together. Therefore, when the compensation valve core moves away from the hydraulic control port K, the structure of the conical rod causes the auxiliary spring to be subjected to pressure, thereby applying a small elastic resistance to the conical rod, thereby achieving a small resistance on the compensation valve core, because compared with the compression spring, the elastic force of the auxiliary spring is much smaller, which can also be understood as the deformation of the compression spring is a relatively large and rough deformation, while the deformation of the auxiliary spring is a small and relatively fine deformation, thereby ensuring the stability of the compensation valve core when it moves.

[0028] Furthermore, the valve body 1 is also provided with a one-way throttle valve 11 connected in series with the sharpening interface A3.

[0029] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A pressure-compensated electrically controlled multi-way valve, comprising a valve body (1), an oil inlet (P) provided on the valve body (1), an oil return port (T), a system overflow valve (2), a throwing and lifting interface (A2), a throwing plate distal interface (A1), a knife sharpening interface (A3), a throwing and rotating first interface (A4), a throwing and rotating second interface (B4), a header folding first interface (A5), a header folding second interface (B5), a feeding reversing interface (A6), a throwing and lifting reversing valve (3) for controlling the throwing and lifting interface (A2), a throwing plate reversing valve (4) for controlling the throwing plate distal interface (A1), and a throwing and rotating reversing valve (5) for controlling the throwing and lifting interface (A2). The valve body (1) is provided with a solenoid unloading valve (8) connected in parallel with the throwing lifting interface (A2), a two-position two-way solenoid reversing valve (9) connected in series with the far-end interface (A1) of the throwing plate, and a knife sharpening solenoid reversing valve (12) used to control the knife sharpening interface (A3), characterized in that: It also includes two pressure compensation valves (10) arranged in the valve body (1), and the two pressure compensation valves (10) are respectively used to ensure the stability of the oil inlet pressure of the casting rotation electromagnetic reversing valve (5) and the header folding electromagnetic reversing valve (6).

2. The pressure-compensated electrically controlled multi-way valve according to claim 1, characterized in that: The pressure compensation valve (10) comprises a compensation valve core chamber (1001) provided on the valve body (1), a compensation valve core (1002) provided in the compensation valve core chamber (1001), a boss (1003) provided at the end of the compensation valve core (1002), a compression spring (1004) provided in the compensation valve core chamber (1001) away from the boss (1003) and applying elastic force to the compensation valve core (1002), a first sealing screw plug (1005) screwed in the compensation valve core chamber (1001) near the boss (1003), and a second sealing screw plug (1006) screwed in the other end of the compensation valve core chamber (1001), and a hydraulic control port (K) communicating with the oil inlet (P) is provided between the boss (1003) and the first sealing screw plug (1005).

3. The pressure-compensated electrically controlled multi-way valve according to claim 2, characterized in that: The compensating valve core (1002) comprises a valve core body (10021), a flow ring groove (10022) provided on the valve core body (10021), and a spring mounting rod (10023) close to the second sealing screw plug (1006), and the compression spring (1004) is mounted on the spring mounting rod (10023).

4. The pressure-compensated electrically controlled multi-way valve according to claim 3, characterized in that: The through-flow annular groove (10022) comprises an equal-diameter annular groove section (100221) and a conical annular groove section (100222), and the diameter of the conical annular groove section (100222) gradually decreases as it approaches the equal-diameter annular groove section (100221).

5. The pressure-compensated electrically controlled multi-way valve according to claim 3, characterized in that: The spring mounting rod (10023) is a tapered rod whose diameter gradually decreases as it approaches the second sealing screw plug (1006).

6. The pressure-compensated electrically controlled multi-way valve according to claim 3, characterized in that: The valve body (1) is also provided with a one-way throttle valve (11) connected in series with the knife sharpening interface (A3).

7. The pressure-compensated electrically controlled multi-way valve according to claim 3, characterized in that: The second sealing screw plug (1006) and the first sealing screw plug (1005) are both provided with sealing rings (1007).

8. The pressure-compensated electrically controlled multi-way valve according to claim 1, characterized in that: The end surface of the boss (1003) is provided with a tapered hole (10031) that penetrates into the compensation valve core and a plurality of radial opening grooves (10032) that communicate with the tapered hole (10031).

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