Plate-type pilot proportional pressure reducing valve group

Abstract

The utility model relates to the technical field of pressure reducing valves, and discloses a plate-type pilot proportional pressure reducing valve group, which comprises a pressure reducing valve main body, a pilot valve is arranged on the pressure reducing valve main body, and an oil inlet and an oil return port are respectively arranged on the pressure reducing valve main body. The plate-type pilot proportional pressure reducing valve bank can meet the requirement that the main valve is driven through the pilot valve, due to the fact that general engineering mechanical operation is mainly achieved through handle manual operation, the valve bank is controlled in an electric proportional mode, automatic operation can be achieved, meanwhile, the valve bank is of a plate-type structure, all oil ports do not need to be externally connected with pipes, and the cost is low. Installation is facilitated, space is reduced, oil is filtered through a filter screen, impurities in the oil are removed, the phenomenon that the main valve is abraded by the impurities in the oil is avoided, a clamping block compresses a spring and retracts into a mounting groove by pulling a connecting plate, the fixing ring and the pressure reducing valve body are conveniently separated, and the filter screen is conveniently replaced.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure reducing valves, in particular to a plate-type pilot proportional pressure reducing valve group. Background Art

[0002] In addition to the main system, there is often a pilot hydraulic system in the hydraulic system. Especially in the field of engineering machinery, the main valve usually requires a pilot valve to drive it.

[0003] For example, a Chinese patent application with publication number CN108662222A discloses a pilot-operated three-way proportional pressure reducing valve, which includes a main valve body with an oil return port disposed therein. The pilot-operated three-way proportional pressure reducing valve also includes a pilot valve, which includes: a pilot valve body; a proportional solenoid; a maximum pressure protection mechanism; and a flow stabilizing mechanism.

[0004] The above-mentioned pressure reducing valve actually includes a pilot structure and an overall pressure reducing valve structure. Although it is possible to control the pressure using a proportional solenoid, its structure is relatively complex, which makes it troublesome to control and has poor control accuracy. In addition, the existing pressure reducing valve generally uses a direct-acting structure for adjustment, that is, a pressure regulating spring is used to adjust the pressure, so it cannot be automatically controlled and the use effect is poor. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the shortcomings of the prior art, the utility model provides a plate-type pilot proportional pressure reducing valve group. Its advantage is that it can meet the demand of driving the main valve through the pilot valve, because the usual operation of engineering machinery is mainly manual operation by handle, and this valve group is electric proportional control, which can realize automatic operation. At the same time, this valve group is a plate structure, and all oil ports do not need external pipes, which is convenient for installation and reduces space. The oil is filtered through the filter to remove impurities in the oil, and the impurities in the oil are prevented from wearing the main valve. By depressing the connecting plate, the block compresses the spring and retracts it into the installation groove, so that the fixing ring is separated from the pressure reducing valve body and the filter is replaced.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a plate-type pilot proportional pressure reducing valve group, including a pressure reducing valve body, a pilot valve is arranged on the pressure reducing valve body, an oil inlet and an oil return port are respectively arranged on the pressure reducing valve body, and an oil outlet is arranged on the right side of the pressure reducing valve body, which can meet the demand of driving the main valve by the pilot valve, because the usual operation of engineering machinery is mainly manual operation by a handle, and this valve group is electrically proportionally controlled, which can realize automatic operation. At the same time, this valve group is a plate-type structure, and all oil ports do not require external pipes, which facilitates installation and reduces space. The electric proportional, direct-acting overflow type pressure reducing valve adjusts the high-pressure main oil circuit pressure at the oil inlet to the reduced pressure required by the oil outlet, and at the same time has a full-flow overflow function from the oil outlet to the oil return port of the oil tank. The offset position of this valve is an overflow mode, and the coil is energized to connect the oil inlet and the oil outlet. Increasing the coil current will increase the reduced pressure of the oil outlet in direct proportion. If the oil outlet pressure exceeds the set value generated by the electromagnetic force of the coil , the oil outlet will overflow to the oil return port; this valve is open in the transition position between the pressure reducing and overflow modes, and this transition position enables the valve to have good pressure control and dynamic response performance, and this valve has optional full manual control, which is used for emergency setting of the valve during power outages or selectively increasing the setting of the valve, and a filtering mechanism is arranged on the main body of the pressure reducing valve; the filtering mechanism comprises: a fixed ring, the fixed ring is slidably connected to the inner wall of the pressure reducing valve main body, the inner wall of the fixed ring is fixedly connected with a filter, a mounting groove is opened on the right side of the fixed ring, a spring is fixedly connected to the inner wall of the mounting groove, one end of the spring is fixedly connected with a clamping block, and the clamping block is slidably connected to the mounting groove, and a connecting plate is fixedly connected to the right side of the clamping block, and the oil is filtered through the filter screen, thereby removing impurities in the oil and preventing the impurities in the oil from wearing the main valve, and by depressing the connecting plate, the clamping block compresses the spring and retracts into the mounting groove, thereby facilitating the separation of the fixed ring from the main body of the pressure reducing valve and facilitating the replacement of the filter.

[0009] Preferably, a slot is provided on the inner wall of the pressure reducing valve body, and the clamping block is clamped in the slot.

[0010] Preferably, the number of the mounting grooves, springs, clamping blocks and connecting plates are two and they are arranged opposite to each other.

[0011] Preferably, a cleaning mechanism is provided in the pressure reducing valve body, and the cleaning mechanism comprises: a fixed frame, the fixed frame is fixedly connected to the inner wall of the pressure reducing valve body, the right side of the fixed frame is rotatably connected to a rotating rod, the left end of the rotating rod passes through the fixed frame and extends to the left, the extended end of the rotating rod is fixedly connected to a turbine blade, and the right end of the rotating rod is fixedly connected to a scraper, and oil enters from the oil inlet to drive the turbine blade to rotate, the turbine blade drives the rotating rod to rotate, and the rotating rod drives the scraper to rotate to scrape impurities adhered to the surface of the filter screen, so as to avoid impurities clogging the filter screen and improve the use effect of the filter screen.

[0012] Preferably, the turbine blade corresponds to the position of the oil inlet, and the scraper fits the filter.

[0013] Preferably, the oil return port is connected to the oil tank.

[0014] (III) Beneficial effects

[0015] Compared with the prior art, the utility model provides a plate-type pilot proportional pressure reducing valve group, which has the following beneficial effects:

[0016] 1. This plate-type pilot proportional pressure reducing valve group can meet the demand of driving the main valve through a pilot valve, because the usual operation of engineering machinery is mainly manual operation by a handle, and this valve group is electrically proportionally controlled and can realize automatic operation. At the same time, this valve group is a plate-type structure, and all oil ports do not require external pipes, which facilitates installation and reduces space. The oil is filtered through a filter to remove impurities in the oil and prevent the impurities in the oil from wearing the main valve. By depressing the connecting plate, the block compresses the spring and retracts it into the installation groove, thereby facilitating the separation of the fixing ring and the pressure reducing valve body and facilitating the replacement of the filter.

[0017] 2. This plate-type pilot proportional pressure reducing valve group drives the turbine blades to rotate through the oil entering from the oil inlet. The turbine blades drive the rotating rod to rotate. The rotating rod drives the scraper to rotate to scrape off the impurities adhered to the surface of the filter screen, thereby preventing the impurities from clogging the filter screen and improving the use effect of the filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a three-dimensional diagram of the utility model;

[0020] Figure 2 It is a partial cross-sectional view of the utility model;

[0021] Figure 3 for Figure 2 Enlarged view of point A.

[0022] In the figure: 1. Pressure reducing valve body; 2. Oil inlet; 3. Oil outlet; 4. Oil return port; 5. Filter mechanism; 51. Fixed ring; 52. Filter screen; 53. Mounting groove; 54. Spring; 55. Block; 56. Connecting plate; 6. Cleaning mechanism; 61. Fixed frame; 62. Rotating rod; 63. Turbine blade; 64. Scraper. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] Example 1

[0025] like Figure 1-3 As shown, the utility model provides a plate-type pilot proportional pressure reducing valve group, including a pressure reducing valve body 1, a pilot valve is arranged on the pressure reducing valve body 1, an oil inlet 2 and an oil return port 4 are respectively arranged on the pressure reducing valve body 1, the oil return port 4 is connected to the oil tank, and an oil outlet 3 is arranged on the right side of the pressure reducing valve body 1, which can meet the demand of driving the main valve through the pilot valve, because the usual operation of engineering machinery is mainly manual operation by handle, and this valve group is electric proportional control, which can realize automatic operation, and at the same time, this valve group is a plate structure, all oil ports do not need external pipes, which is convenient In order to reduce the installation space, the electric proportional, direct-acting overflow pressure reducing valve adjusts the high-pressure main oil circuit pressure of the oil inlet 2 to the reduced pressure required by the oil outlet 3, and at the same time has the full-flow overflow function from the oil outlet 3 to the oil tank return port 4. The bias position of this valve is the overflow mode. The coil is energized to connect the oil inlet 2 and the oil outlet 3. Increasing the coil current will proportionally increase the reduced pressure of the oil outlet 3. If the pressure of the oil outlet 3 exceeds the set value generated by the electromagnetic force of the coil, the oil outlet 3 will overflow to the oil return port 4; this valve is open in the transition position between the pressure reduction and overflow modes. This transition position The valve has good pressure control and dynamic response performance, and the valve has optional full manual control, which is used for emergency setting of the valve during power outage or selectively increasing the setting of the valve. A filter mechanism 5 is provided on the pressure reducing valve body 1; the filter mechanism 5 includes: a fixed ring 51, the fixed ring 51 is slidably connected to the inner wall of the pressure reducing valve body 1, the inner wall of the fixed ring 51 is fixedly connected to a filter screen 52, the right side of the fixed ring 51 is provided with a mounting groove 53, the inner wall of the mounting groove 53 is fixedly connected to a spring 54, one end of the spring 54 is fixedly connected to a clamping block 55, and the clamping block 55 is fixedly connected to the mounting groove 53. The groove 53 is slidably connected, and a card groove is opened on the inner wall of the pressure reducing valve body 1, and the card block 55 is carded in the card groove. A connecting plate 56 is fixedly connected to the right side of the card block 55. There are two groups of mounting grooves 53, springs 54, card blocks 55, and connecting plates 56, and they are relatively arranged. The oil is filtered through the filter screen 52 to remove impurities in the oil to prevent the impurities in the oil from wearing the main valve, and the card block 55 compresses the spring 54 and retracts into the mounting groove 53 by depressing the connecting plate 56, so as to facilitate the separation of the fixing ring 51 from the pressure reducing valve body 1 and the replacement of the filter screen 52.

[0026] In this embodiment, the need to drive the main valve by a pilot valve can be met, because the usual operation of engineering machinery is mainly manual operation by a handle, and this valve group is an electric proportional control, which can realize automatic operation. At the same time, this valve group is a plate structure, and all oil ports do not require external pipes, which facilitates installation and reduces space. The oil source flows from the oil inlet 2 through the pilot proportional pressure reducing valve to the oil outlet 3 and then flows into the main valve core control port. According to the increase of the current signal given by the user, the pressure of this valve core also increases, so that the displacement of the main valve core opening is larger. When it is not necessary to work, as long as the valve core is not powered, this valve core will quickly reset, so that the oil in the main valve core control port is quickly returned from the return oil port 4, and the oil is filtered through the filter 52, so as to remove impurities in the oil, and avoid the impurities in the oil from wearing the main valve, and by depressing the connecting plate 56, the block 55 compresses the spring 54 and retracts into the installation groove 53, so that the fixing ring 51 is separated from the pressure reducing valve body 1, and the filter 52 is replaced.

[0027] Example 2

[0028] like Figure 1-3 As shown, on the basis of Example 1, the utility model provides a technical solution: preferably, a cleaning mechanism 6 is provided in the pressure reducing valve body 1, and the cleaning mechanism 6 includes: a fixed frame 61, the fixed frame 61 is fixedly connected to the inner wall of the pressure reducing valve body 1, the right side of the fixed frame 61 is rotatably connected to a rotating rod 62, the left end of the rotating rod 62 passes through the fixed frame 61 and extends to the left, the extended end of the rotating rod 62 is fixedly connected to a turbine blade 63, the turbine blade 63 corresponds to the position of the oil inlet 2, the right end of the rotating rod 62 is fixedly connected to a scraper 64, the scraper 64 is fitted with the filter screen 52, the oil enters from the oil inlet 2 to drive the turbine blade 63 to rotate, the turbine blade 63 drives the rotating rod 62 to rotate, and the rotating rod 62 drives the scraper 64 to rotate to scrape off impurities adhered to the surface of the filter screen 52, so as to avoid impurities clogging the filter screen 52 and improve the use effect of the filter screen 52.

[0029] In this embodiment, oil enters from the oil inlet 2 to drive the turbine blades 63 to rotate, and the turbine blades 63 drive the rotating rod 62 to rotate. The rotating rod 62 drives the scraper 64 to rotate to scrape off impurities adhered to the surface of the filter 52, thereby preventing impurities from clogging the filter 52 and improving the use effect of the filter 52.

[0030] The following is a detailed description of the working principle of this plate-type pilot proportional pressure reducing valve group.

[0031] like Figure 1-3As shown, when in use, the oil source flows from the oil inlet 2 through the pilot proportional pressure reducing valve to the oil outlet 3 and then flows into the main valve core control port. According to the increase of the current signal given by the user, the pressure of the valve core also increases, so that the displacement of the main valve core opening is larger. When it is not needed to work, as long as the valve core is not powered, the valve core will quickly reset, so that the oil in the main valve core control port quickly returns from the oil return port 4, and the oil is filtered through the filter 52 to remove impurities in the oil to prevent the impurities in the oil from wearing the main valve, and by depressing the connecting plate 56, the block 55 compresses the spring 54 and retracts it into the installation groove 53, so that the fixing ring 51 is separated from the pressure reducing valve body 1, and the filter 52 is replaced. The oil enters from the oil inlet 2 to drive the turbine blade 63 to rotate, and the turbine blade 63 drives the rotating rod 62 to rotate, and the rotating rod 62 drives the scraper 64 to rotate to scrape off the impurities adhered to the surface of the filter 52 to prevent the impurities from clogging the filter 52.

Claims

1. A plate-type pilot proportional pressure reducing valve assembly, comprising a pressure reducing valve body (1), characterized in that: The pressure reducing valve body (1) is provided with a pilot valve, the pressure reducing valve body (1) is respectively provided with an oil inlet (2) and an oil return port (4), the right side of the pressure reducing valve body (1) is provided with an oil outlet (3), and the pressure reducing valve body (1) is provided with a filtering mechanism (5); the filtering mechanism (5) comprises: a fixing ring (51), the fixing ring (51) is slidably connected to the inner wall of the pressure reducing valve body (1), the inner wall of the fixing ring (51) is fixedly connected to a filter screen (52), the right side of the fixing ring (51) is provided with a mounting groove (53), the inner wall of the mounting groove (53) is fixedly connected to a spring (54), one end of the spring (54) is fixedly connected to a clamping block (55), and the clamping block (55) is slidably connected to the mounting groove (53), and the right side of the clamping block (55) is fixedly connected to a connecting plate (56).

2. A plate-type pilot proportional pressure reducing valve group according to claim 1, characterized in that: The inner wall of the pressure reducing valve body (1) is provided with a clamping groove, and the clamping block (55) is clamped in the clamping groove.

3. A plate-type pilot proportional pressure reducing valve assembly according to claim 1, characterized in that: The number of the installation grooves (53), springs (54), clamping blocks (55) and connecting plates (56) are two groups, and they are arranged opposite to each other.

4. A plate-type pilot proportional pressure reducing valve assembly according to claim 1, characterized in that: A cleaning mechanism (6) is arranged inside the pressure reducing valve body (1), and the cleaning mechanism (6) comprises: a fixing frame (61), the fixing frame (61) is fixedly connected to the inner wall of the pressure reducing valve body (1), the right side of the fixing frame (61) is rotatably connected to a rotating rod (62), the left end of the rotating rod (62) passes through the fixing frame (61) and extends to the left, the extended end of the rotating rod (62) is fixedly connected to a turbine blade (63), and the right end of the rotating rod (62) is fixedly connected to a scraper (64).

5. A plate-type pilot proportional pressure reducing valve assembly according to claim 4, characterized in that: The turbine blade (63) corresponds to the position of the oil inlet (2), and the scraper (64) fits the filter screen (52).

6. A plate-type pilot proportional pressure reducing valve assembly according to claim 1, characterized in that: The oil return port (4) is connected to the oil tank.

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