Novel pilot foot valve of electro-hydraulic integrated control

Abstract

The utility model discloses a novel pilot foot valve of electro-hydraulic integrated control relates to hydraulic control valve technical field. The novel pilot foot valve of electro-hydraulic integrated control, including valve body, the top outer wall fixed connection of valve body has lower fixed base, the top threaded connection of lower fixed base has the limit screw, the top outer wall fixed connection of lower fixed base has the rib -plate, the rib -plate is fixedly connected with lower fixed base through lower seat fixed screw, the top of rib -plate is provided with arc groove, the outer wall of rib -plate is passed and is set up with the axle hole A, the arc groove is located axle hole A left top, the inside of valve body is provided with pressure reducing valve subassembly. The utility model not only realizes traditional hydraulic output while generating the output of electric signal again, and highly integrated and compact design can simplify engineering machinery whole machine control system design, shortens the development cycle of novel whole machine and reduces manufacturing cost, and extremely has market popularization value.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control valve technology, and in particular to a novel electro-hydraulic integrated control pilot foot valve. Background Technology

[0002] A foot-operated hydraulic pilot control valve is a type of valve operated by foot, which is a pilot pressure reducing valve that outputs reduced pressure to push the valve stem in the pilot chamber of the hydraulic main valve to switch directions, thereby achieving remote control of actuator actions such as motor movement / rotation and cylinder extension / retraction. It belongs to the pilot control circuit of a hydraulic system. During operation, a high-pressure power source is provided by the pilot oil source valve, which reduces the pressure after passing through the internal pressure reducing valve of the foot valve, outputting a lower control pressure. This output pressure is linearly proportional to the pedal angle, controlling the hydraulic main valve of the construction machinery to achieve the corresponding switching action. It can also stably control the output flow rate of the hydraulic main valve, making it an important component of the pilot control system. Because it is operated by foot, it allows for greater operating force than manual operation of the pilot valve, enabling the output of greater pilot pressure, making it particularly suitable for mobile construction machinery or high-pressure, high-flow hydraulic actuators.

[0003] With the development of modern intelligent technology, the operation and control of engineering machinery have become increasingly integrated and intelligent. When operating the foot valve to output hydraulic pilot signal, the simultaneous output of electrical signal is undoubtedly very beneficial to the layout design and development of new models. This electrical signal can be used to control other electrical components, such as electromagnets for hydraulic valves, or it can be connected to safety protection control circuits, or directly trigger warning lights or audible alarm signals, etc.

[0004] Currently, there have been some explorations in the industry regarding pilot valve technology with electro-hydraulic combined control. For example, the utility model patent with patent number "CN202222093295.4" entitled "An Electro-hydraulic Combined Control Pilot Valve Handle" has successfully achieved electro-hydraulic signal coordinated output for manually operated pilot valves and has completed commercial application. However, for electro-hydraulic combined technology for foot-operated pilot valves, there are currently no similar products on the market, and related patents are also lacking. This cannot meet the integrated control requirements for foot-operated components during the intelligent upgrading of engineering machinery. Therefore, developing an electro-hydraulic combined foot-operated pilot valve not only meets market development expectations but also fills a technological gap in the industry, providing core component support for the development of new models. Utility Model Content

[0005] The purpose of this invention is to provide a novel pilot foot valve with electro-hydraulic integrated control, which solves the technical problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a novel electro-hydraulic integrated control pilot foot valve, comprising a valve body, a lower fixed base fixedly connected to the top outer wall of the valve body, a limit screw threadedly connected to the top of the lower fixed base, a rib plate fixedly connected to the top outer wall of the lower fixed base, the lower fixed base being fixedly connected to the valve body by a lower fixed screw, an arc groove provided on the top of the rib plate, a central hole A penetrating through the outer wall of the rib plate, the arc groove being located to the upper left of the central hole A; The valve body is equipped with a pressure reducing valve assembly. An upper movable connector is rotatably connected above the lower fixed base. A pedal assembly is located above the upper movable connector. A micro switch is installed on the outer side wall of the upper movable connector. The pressure reducing valve assembly consists of a valve sleeve, a valve core, a spring seat, a return spring, a pressure spring, a guide sleeve, and a plunger. The bottom outer wall of the pedal assembly is fixedly connected to a pedal bracket and a pedal fixing screw. The pedal bracket is fixedly connected to the upper movable connecting member by the pedal fixing screw. The inner wall of the upper movable connecting member is threaded with a spherical screw.

[0007] Preferably, the valve body is provided with a wire groove at the position corresponding to the wire hole.

[0008] Preferably, the top outer wall of the rib plate has a wire hole, and the bottom outer wall of the rib plate, below the wire hole, has a wire outlet.

[0009] Preferably, a valve core is provided between the spring seat and the valve sleeve, a plunger is provided inside the guide sleeve, one end of the plunger is connected to the spring seat, a return spring and a pressure spring are provided between the valve sleeve and the spring seat, the return spring is located outside the pressure spring, the return spring is sleeved outside the valve core, and the spherical surface of the spherical screw is in high-pair contact with the upper plane of the plunger.

[0010] Preferably, the outer wall of the upper movable connector is provided with a screw hole for installing a micro switch and a spindle hole B. The screw hole is located above the spindle hole B and is distributed on the left and right sides of the spindle hole B. A spindle is provided between the inner walls of the spindle hole A and the spindle hole B. The outer wall of the upper movable connector is provided with a groove for accommodating the micro switch and its wires, and the depth of the groove is greater than the thickness of the micro switch.

[0011] Preferably, the micro switch includes a housing, a contact, a lever, and a ball. The trigger end of the contact is positioned facing the inner opening of the housing. The contact contacts the lever. The lever is rotatably mounted on the inner wall of the housing via a pivot. A ball is provided at one end of the lever that extends out of the housing.

[0012] Preferably, the ball radius of the micro switch is adapted to the arc groove, and the arc groove and the groove are on the same side.

[0013] Compared with related technologies, the novel electro-hydraulic integrated control pilot foot valve provided by this utility model has the following beneficial effects: 1. This utility model provides a novel electro-hydraulic integrated control pilot foot valve, which adds new functions and solves the limitation of existing foot pilot valves that can only output hydraulic pilot signals and have no electrical signal output.

[0014] 2. This utility model provides a novel electro-hydraulic integrated control pilot foot valve, which requires minimal modification and has low cost. Without changing the appearance and main component structure of the original traditional foot pilot valve, it has electro-hydraulic linkage dual output function. Customers do not need to change the installation method and iterative replacement is convenient.

[0015] 3. This utility model provides a novel electro-hydraulic integrated control pilot foot valve, which is flexible in application and can output electrical signals or close electrical signals; the electrical signals can be output simultaneously with the hydraulic signals, or output before or after the hydraulic signals.

[0016] 4. This utility model provides a novel electro-hydraulic integrated control pilot foot valve, which not only realizes the traditional hydraulic output but also generates an electrical signal output. Its highly integrated and compact design simplifies the design of the overall control system of engineering machinery, shortens the development cycle of new machines, and reduces manufacturing costs, making it highly valuable for market promotion. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the micro switch structure of this utility model; Figure 3 This is a schematic diagram of the micro switch structure of this utility model; Figure 4 This is the upper movable connecting part of this utility model; Figure 5 This is the upper movable connecting part of this utility model; Figure 6 This is a schematic diagram of the lower fixed base of this utility model; Figure 7 This is a schematic diagram of the lower fixed base of this utility model; Figure 8 This is a schematic diagram of the valve body structure of this utility model; Figure 9 This is a schematic diagram of the pressure reducing valve assembly of this utility model; Figure 10 This is a schematic diagram illustrating the operating principle of this utility model.

[0018] In the diagram: 1. Valve body; 101. Wire groove; 2. Lower fixed base; 201. Rib; 202. Arc groove; 203. Shaft hole A; 204. Wire hole; 205. Outlet; 206. Lower base fixing screw; 3. Pressure reducing valve assembly; 301. Valve sleeve; 302. Valve core; 303. Spring seat; 304. Return spring; 305. Pressure spring; 306. Guide sleeve; 307. Plunger; 4. Upper movable connecting part; 401. Groove; 402. Screw hole; 403. Shaft hole B; 5. Spindle; 6. Pedal assembly; 601. Pedal bracket; 602. Pedal fixing screw; 603. Spherical screw; 7. Micro switch; 701. Housing; 702. Contact; 703. Rocker arm; 704. Ball bearing; 8. Limit screw. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model. Example

[0020] Please see Figures 1-10 This utility model provides a technical solution: a novel electro-hydraulic integrated control pilot foot valve, including a valve body 1, a lower fixed base 2 fixedly connected to the top outer wall of the valve body 1, a limit screw 8 threadedly connected to the top of the lower fixed base 2, a rib plate 201 fixedly connected to the top outer wall of the lower fixed base 2, the lower fixed base 2 being fixedly connected to the valve body 1 by a lower fixed screw 206, an arc groove 202 being provided on the top of the rib plate 201, and a central hole A203 being opened through the outer wall of the rib plate 201, with the arc groove 202 located to the upper left of the central hole A203; The valve body 1 is equipped with a pressure reducing valve assembly 3. The upper movable connecting piece 4 is rotatably connected above the lower fixed base 2. The upper movable connecting piece 4 is equipped with a pedal assembly 6. The outer side wall of the upper movable connecting piece 4 is equipped with a micro switch 7. The pressure reducing valve assembly 3 consists of a valve sleeve 301, a valve core 302, a spring seat 303, a return spring 304, a pressure spring 305, a guide sleeve 306, and a plunger 307. The bottom outer wall of the pedal assembly 6 is fixedly connected to a pedal bracket 601 and a pedal fixing screw 602. The pedal bracket 601 is fixedly connected to the upper movable connector 4 by the pedal fixing screw 602. The inner wall of the upper movable connector 4 is threaded with a spherical screw 603.

[0021] Among them, the valve body 1 is provided with a wire groove 101 at the position corresponding to the wire hole 204.

[0022] The rib plate 201 has a wire hole 204 on its top outer wall and a wire outlet 205 on its bottom outer wall below the wire hole 204.

[0023] A valve core 302 is provided between the spring seat 303 and the valve sleeve 301. A plunger 307 is provided inside the guide sleeve 306. One end of the plunger 307 is connected to the spring seat 303. A return spring 304 and a pressure spring 305 are provided between the valve sleeve 301 and the spring seat 303. The return spring 304 is located outside the pressure spring 305. The return spring 304 is sleeved on the outside of the valve core 302. The spherical surface of the spherical screw 603 is in high-pair contact with the upper surface of the plunger 307.

[0024] Among them, the outer wall of the upper movable connector 4 is provided with a screw hole 402 for installing a micro switch 7 and a shaft hole B403. The screw hole 402 is located above the shaft hole B403 and the screw holes 402 are distributed on the left and right sides of the shaft hole B403. A spindle 5 is provided between the inner wall of the shaft hole A203 and the shaft hole B403. The outer wall of the upper movable connector 4 is provided with a groove 401 for accommodating the micro switch 7 and its wires. The depth of the groove 401 is greater than the thickness of the micro switch 7.

[0025] The micro switch 7 includes a housing 701, a contact 702, a lever 703, and a ball 704. The trigger end of the contact 702 is positioned facing the inner opening of the housing 701. The contact 702 contacts the lever 703. The lever 703 is rotatably mounted on the inner wall of the housing 701 via a pivot. A ball 704 is provided at one end of the lever 703 that extends out of the housing 701.

[0026] Among them, the radius of the ball 704 of the micro switch 7 is adapted to the arc groove 202, and the arc groove 202 and the groove 401 are on the same side.

[0027] In this implementation scheme, when the foot valve is in the neutral position and not operated, control ports A and B are connected to port T, but not to port P. During operation, for example, by gradually increasing the applied force on the upper part of the pedal assembly, the pedal begins to swing counterclockwise, and at this time, the pressure reducing valve core begins to move downward. When the downward movement distance is less than the sealing oil length L3, the pressure port P and control port A are not yet connected, and there is no pressure signal output at this time. When the pedal assembly swings to a certain angle θ1, the valve core moves downward beyond the covering length L3 between the valve core and the valve sleeve, the pressure port P connects to the control port A, and there is a pilot pressure output. Due to the pressure reducing effect of the pressure reducing valve, the output pressure is generally less than the oil supply pressure. During the process of the pedal swinging to a certain angle θ1, the micro switch ball gradually leaves the bottom of the arc groove and rolls towards the arc surface. Before reaching the arc surface, the lever compression switch contact of the micro switch has not yet reached the switch action stroke, and the switch does not output (close) electrical signal. Until the pedal swing angle reaches θ1, the ball arc is just tangent to the arc surface, at this time the micro switch contact is compressed to the position, and the switch is activated. As the pedal continues to swing to its maximum angle (13 degrees), control port A outputs a hydraulic signal proportional to the pedal swing angle. The compression of the microswitch contacts remains unchanged, and the switch remains in an active state. This achieves simultaneous output of hydraulic and electrical signals.

[0028] When the foot valve is not operated, the pressure reducing valve reset spring pushes the pedal to swing in the opposite direction and return it to the neutral position. The micro switch ball also returns to the arc groove, the micro switch contact compression is released, and the switch action ends.

[0029] Applying force to the lower part of the pedal assembly causes the pedal assembly to swing clockwise, connecting the P port and the B port, thus triggering the micro switch. The principle is basically the same as the counterclockwise action.

[0030] Changing the installation position dimension H2 of the micro switch, for example, decreasing the value of H2, increases the pre-compression of the micro switch contacts, which can achieve the design objective of outputting electrical signals before hydraulic signals; conversely, increasing the value of H2 decreases the pre-compression of the micro switch contacts, which can achieve the design objective of outputting electrical signals after hydraulic signals. Example

[0031] This embodiment is a further optimization of Embodiment 1. Based on Embodiment 1, as follows: Figures 1-10 As shown, an Omron ball-type micro switch is selected. This type of switch is small in size, sensitive and reliable in action, and has a long service life. Its thickness H1 = 6.4 mm. The ball radius R1 = 2.4 mm.

[0032] Without altering the original main structure of the foot valve parts, a groove with a depth of 6.5mm is added to the side of the upper movable connector; the groove surrounds the shaft hole, and its area includes not only the installation of the micro switch but also a portion of the wire area. Two M2 screw holes are provided above the shaft hole at a distance of H2=21.8mm, distributed on both sides of the shaft centerline. The screw holes are 3mm away from the shaft centerline on the left side L1=3mm and on the right side L2=3.5mm.

[0033] The lower fixed base has a coaxial arc surface on the upper part of the rib plate on the same side as the groove of the upper movable connecting part, with a radius of R2 = 12mm. An arc groove with a radius of R3 = 2.4mm is provided on the arc. The distance from the arc groove to the axis is H3 = 11.4mm and H4 = 6.9mm. This position allows the micro switch ball to roll onto the surface of the arc surface R2 after leaving the bottom surface of the arc groove R3. The micro switch lever and contact have a reasonable amount of compression, ensuring safe switch operation.

[0034] The micro switch should be wired with the normally open function selected.

[0035] The above-mentioned size configuration enables the simultaneous output of hydraulic pilot signals and electrical signals from the foot valve.

[0036] The lower fixing base has a 6mm wire hole and a wire outlet on the same side of the arc surface. The wire outlet is 6mm high and 8mm wide.

[0037] On the side of the valve body, a wire groove with a radius of 4mm and a height of 12mm is vertically installed at the position corresponding to the wire hole.

[0038] The above embodiments are specific implementations of a single-foot-operated hydraulic pilot valve. Since the double-foot-operated hydraulic pilot valve is based on the single-foot-operated valve with two additional control ports, and the principle is the same, the structure, principle, size and position of this utility model are also applicable to the double-foot-operated valve.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A novel electro-hydraulic integrated control pilot foot valve, comprising a valve body (1), characterized in that: The valve body (1) is fixedly connected to the top outer wall of the lower fixed base (2). The top of the lower fixed base (2) is threaded with a limit screw (8). The top outer wall of the lower fixed base (2) is fixedly connected with a rib plate (201). The lower fixed base (2) is fixedly connected to the valve body (1) by a lower fixed screw (206). The top of the rib plate (201) is provided with an arc groove (202). The outer wall of the rib plate (201) is provided with a through hole A (203). The arc groove (202) is located to the upper left of the through hole A (203). The valve body (1) is provided with a pressure reducing valve assembly (3) inside. The upper movable connector (4) is rotatably connected above the lower fixed base (2). The upper movable connector (4) is provided with a pedal assembly (6) above the upper movable connector (4). A micro switch (7) is installed on the outer side wall of the upper movable connector (4). The pressure reducing valve assembly (3) consists of a valve sleeve (301), a valve core (302), a spring seat (303), a return spring (304), a pressure spring (305), a guide sleeve (306), and a plunger (307); The bottom outer wall of the pedal assembly (6) is fixedly connected with a pedal bracket (601) and a pedal fixing screw (602). The pedal bracket (601) is fixedly connected to the upper movable connector (4) by the pedal fixing screw (602). The inner wall of the upper movable connector (4) is threaded with a spherical screw (603).

2. The novel electro-hydraulic integrated control pilot foot valve according to claim 1, characterized in that: The valve body (1) is provided with a wire groove (101) at the position corresponding to the wire hole (204).

3. The novel electro-hydraulic integrated control pilot foot valve according to claim 1, characterized in that: The top outer wall of the rib (201) is provided with a wire hole (204), and the bottom outer wall of the rib (201) and below the wire hole (204) is provided with a wire outlet (205).

4. The novel electro-hydraulic integrated control pilot foot valve according to claim 1, characterized in that: A valve core (302) is provided between the spring seat (303) and the valve sleeve (301). A plunger (307) is provided inside the guide sleeve (306). One end of the plunger (307) is connected to the spring seat (303). A return spring (304) and a pressure spring (305) are provided between the valve sleeve (301) and the spring seat (303). The return spring (304) is located outside the pressure spring (305). The return spring (304) is sleeved on the outside of the valve core (302). The spherical surface of the spherical screw (603) is in high-pair contact with the upper plane of the plunger (307).

5. The novel electro-hydraulic integrated control pilot foot valve according to claim 1, characterized in that: The outer wall of the upper movable connector (4) is provided with a screw hole (402) for installing a micro switch (7) and a shaft hole B (403). The screw hole (402) is located above the shaft hole B (403). The screw holes (402) are distributed on the left and right sides of the shaft hole B (403). A spindle (5) is provided between the inner wall of the shaft hole A (203) and the shaft hole B (403). The outer wall of the upper movable connector (4) is provided with a groove (401) for accommodating the micro switch (7) and its wires, and the depth of the groove (401) is greater than the thickness of the micro switch (7).

6. The novel electro-hydraulic integrated control pilot foot valve according to claim 1, characterized in that: The micro switch (7) includes a housing (701), a contact (702), a lever (703), and a ball (704). The trigger end of the contact (702) is arranged facing the inner opening of the housing (701). The contact (702) is in contact with the lever (703). The lever (703) is rotatably mounted on the inner wall of the housing (701) via a rotating shaft. A ball (704) is provided at one end of the lever (703) that extends out of the housing (701).

7. The novel electro-hydraulic integrated control pilot foot valve according to claim 6, characterized in that: The radius of the ball (704) of the micro switch (7) is adapted to the arc groove (202), and the arc groove (202) and the groove (401) are on the same side.

Images