Linear direct drive type electro-hydraulic servo proportional valve of multi-flow series slide valve level structure

Abstract

The utility model belongs to the technical field of mechanical engineering, and relates to a linear direct drive type electro-hydraulic servo proportional valve of a multi-flow series slide valve level structure, which comprises an end cover, a spring, a spring seat, a valve core, a valve sleeve, a shell, a controller and a proportional electromagnet, the valve element is slidably arranged in the valve sleeve, the valve sleeve and the valve element form a sliding valve level structure and are arranged in the shell, the end cover is arranged on the left side of the shell, the spring and the spring seat are arranged in the shell, the spring seat makes contact with the left end face of the valve element, one end of the spring makes contact with the spring seat, and the other end of the spring makes contact with the wall face of an inner hole of the end cover. An extension rod of the proportional electromagnet makes contact with the right end face of the valve element, the controller is arranged above the proportional electromagnet, electrically connected with the proportional electromagnet and used for controlling the extension length of the extension rod of the proportional electromagnet, two rows of square holes are formed in the outer circumferential face of the valve sleeve, one row of square holes are communicated with the load port A, and the other row of square holes are communicated with the load port B; a plurality of pressure equalizing grooves with different outer circle sizes are formed in the circumferential face of the valve element.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical engineering and relates to a linear direct-drive electro-hydraulic servo proportional valve with a multi-flow series slide valve stage structure. Background Art

[0002] The electro-hydraulic servo proportional valve is a key component in the servo control system, and the linear direct-drive electro-hydraulic servo proportional valve is the most widely used.

[0003] The general linear direct drive electro-hydraulic servo proportional valve is mainly composed of a slide valve stage mechanical structure, a proportional solenoid and a controller. The slide valve stage mechanical structure consists of a housing, a valve sleeve, a valve core, a spring, a spring seat and an end cover. The valve sleeve is slowly pressed into the housing on a press. After cleaning, the valve core should fit well in the valve sleeve and the valve core can rotate in any direction. The spring seat and spring are installed into the housing hole in sequence, and then the end cover is fastened to the housing with four screws.

[0004] The displacement of the spool of the linear direct-drive electro-hydraulic servo proportional valve is fed back to the internal integrated controller through the LVDT displacement sensor to realize the internal closed loop. The valve has excellent anti-pollution ability and good static and dynamic performance, and can be used in various electro-hydraulic position, speed, force (or pressure) control systems to play the role of electro-hydraulic conversion and power amplification.

[0005] When the command signal is input, the integrated controller inside the servo valve generates a control current to the coil of the proportional solenoid, and the proportional solenoid moves to push the valve core to move. The LVDT displacement sensor installed on the proportional solenoid generates an electrical signal proportional to the displacement as the valve core moves. The signal is fed back to the controller and compared with the input signal. The compared error signal is amplified and moves through the proportional solenoid until the error signal is 0. Therefore, the position of the valve core is proportional to the input signal, and the linear working window simultaneously outputs an output flow proportional to the input signal.

[0006] However, the biggest problem with the linear direct-drive electro-hydraulic servo proportional valve is that the flow form and safety function position are single. When the system actuator operating speed requirement changes, the flow of the electro-hydraulic servo proportional valve needs to change accordingly, and the flow change achieved by partial debugging of the controller is often very small, resulting in the electro-hydraulic servo proportional valve not matching the system requirements, which greatly affects the flexibility and reliability of the control system. When the system is powered off and different functional position flow outputs are required, the existing electro-hydraulic proportional servo valve has only one or even no safety function position, and the system often needs to add a stop valve to realize the system function, which greatly increases the cost of the control system. At present, through the improvement of the multi-flow series slide valve stage structure, the electro-hydraulic servo proportional valve can realize the output of multiple flow series and realize different power-off safety function positions of the electro-hydraulic servo proportional valve. Utility Model Content

[0007] Aiming at the defects of the existing linear direct-drive electro-hydraulic servo proportional valve in terms of single flow form and safety function position, the purpose of the utility model is to propose a linear direct-drive electro-hydraulic servo proportional valve multi-flow series slide valve stage structure, the valve sleeve is provided with multiple square holes, which communicate with the oil ports P, A, B, and T of the housing, and the size of the square hole L can realize the output of the linear direct-drive electro-hydraulic servo proportional valve multi-flow series. The valve core is arranged inside the valve sleeve, and the valve sleeve clearance is matched, and multiple pressure-equalizing grooves with different outer circle sizes are arranged, which can reduce the hydraulic clamping force, and at the same time play the role of blocking the passage of oil in the square hole of the valve sleeve, so as to realize different power-off safety function positions of the electro-hydraulic servo proportional valve.

[0008] The technical solution of the utility model is as follows:

[0009] A linear direct-drive electro-hydraulic servo proportional valve with a multi-flow series slide valve stage structure, including an end cover, a spring, a spring seat, a valve core, a valve sleeve, a housing, a controller, and a proportional solenoid;

[0010] The valve core is slidably arranged in the valve sleeve, and the valve sleeve and the valve core form a sliding valve stage structure, which is arranged inside the shell, and the end cover is arranged on the left side of the shell, and the spring and spring seat are arranged inside the shell, and the spring seat contacts the left end face of the valve core, one end of the spring contacts the spring seat, and the other end contacts the inner hole wall of the end cover, and the proportional electromagnet is arranged on the right side of the shell, and the extension rod of the electromagnet contacts the right end face of the valve core, and the controller is arranged above the proportional electromagnet, and is electrically connected to the proportional electromagnet to control the extension length of the extension rod of the proportional electromagnet, and two rows of square holes are arranged on the outer circumferential surface of the valve sleeve, one row of square holes communicates with the load port A, and the other row of square holes communicates with the load port B, and a plurality of equalizing pressure grooves with different outer circle sizes are arranged on the circumferential surface of the valve core.

[0011] Further, the end cover is fixed to the left side of the shell by an end cover mounting screw.

[0012] Furthermore, an end cover sealing ring is arranged between the end cover and the left end surface of the shell.

[0013] Further, the controller is fixed to the proportional solenoid by means of a controller mounting screw.

[0014] Furthermore, the proportional electromagnet is fixed to the housing by means of electromagnet mounting screws.

[0015] Furthermore, a guard plate is provided at the bottom of the shell, and the guard plate is mounted to the bottom of the shell (8) by means of bottom surface mounting screws and nuts.

[0016] Furthermore, a bottom sealing ring is arranged between the bottom of the shell and the guard plate.

[0017] Furthermore, the valve sleeve and the valve core are clearance-matched, and the clearance-matching dimension is less than 0.01 mm.

[0018] Furthermore, the square hole size L on the valve sleeve is obtained by mechanical processing, and the roughness is 0.4.

[0019] Furthermore, the axial width and radial depth of the pressure equalizing groove should be at least 10 times the fitting clearance between the valve core and the valve sleeve.

[0020] After the system determines the operating speed requirement and safety function position of the actuator, the multiple square holes set in the valve sleeve are machined to determine different L sizes, thereby realizing the output of a variety of different flow rates of 0 to 100L / min for the linear direct-drive electro-hydraulic servo proportional valve. The valve core is provided with multiple equalizing pressure grooves with different outer circle sizes. After the proportional solenoid is powered off, the valve core is pushed to the right by the spring to block the passage of oil in different square holes of the valve sleeve, thereby realizing different safety function positions of O, Y, and H in the middle position of the electro-hydraulic servo proportional valve, thereby increasing the flow diversity and use safety of the linear direct-drive electro-hydraulic servo proportional valve.

[0021] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0022] 1. The utility model sets a plurality of square holes through the valve sleeve to communicate with the oil port of the shell. The size L of the square hole can be machined to achieve the output of a variety of different flow rates of 0 to 100L / min of the linear direct-drive electro-hydraulic servo proportional valve, which has the advantage of achieving a multi-flow series output;

[0023] 2. The valve core of the utility model is provided with a plurality of pressure-equalizing grooves of different outer diameters. When the proportional solenoid is powered off, the valve core is pushed to the right by the spring to block the oil from passing through the square hole of the valve sleeve, thereby achieving the purpose of different safety function positions of the electro-hydraulic servo proportional valve in the middle position O, Y, and H;

[0024] 3. The width and depth of the pressure equalizing groove of the utility model should be at least 10 times of the radial clearance, so that the liquid around the valve core can flow from the high-pressure area to the low-pressure area, the pressure around the groove tends to be equal, and the valve core is positioned at the center of the hole, which has the advantage of reducing the hydraulic clamping force;

[0025] 4. The slide valve stage structure of the utility model has little difference. The outer circle size of the square hole and the pressure equalizing groove of the linear direct-drive electro-hydraulic servo proportional valve can be changed by simple machining, so as to achieve flexible adaptation of the flow rate and safety function position. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is the principle diagram of the linear direct-drive electro-hydraulic servo proportional valve of the multi-flow series slide valve stage structure of the utility model;

[0027] Figure 2 It is a cross-sectional view of the slide valve stage structure of the utility model;

[0028] Figure 3 It is a schematic diagram of the slide valve stage structure of the utility model;

[0029] Figure 4 It is a schematic diagram of different square holes of the valve sleeve of the utility model;

[0030] Figure 5 This is a comparison of the slide valve level structure and the power-off safety function position of the utility model. Figure 1 (The safety function position is "O" type);

[0031] Figure 6 This is a comparison of the slide valve level structure and the power-off safety function position of the utility model. Figure 2 (The safety function position is "Y" type);

[0032] Figure 7 This is a comparison of the slide valve level structure and the power-off safety function position of the utility model. Figure 3 (The safety function position is "H" type);

[0033] Among them: 1 is the end cover, 2 is the end cover mounting screw, 3 is the spring, 4 is the end cover sealing ring, 5 is the spring seat, 6 is the valve core, 7 is the valve sleeve, 8 is the housing, 9 is the controller, 10 is the controller mounting screw, 11 is the proportional solenoid, 12 is the solenoid mounting screw, 13 is the guard plate, 14 is the bottom sealing ring, 15 is the bottom sealing ring, and 16 is the nut. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0035] The linear direct-drive electro-hydraulic servo proportional valve of the multi-flow series slide valve stage structure comprises an end cover 1, an end cover mounting screw 2, a spring 3, an end cover sealing ring 4, a spring seat 5, a valve core 6, a valve sleeve 7, a housing 8, a controller 9, a controller mounting screw 10, a proportional electromagnet 11, an electromagnet mounting screw 12, a bottom surface mounting screw 14, and a bottom surface sealing ring 15. The valve core 6 is slidably arranged in the valve sleeve 7. The valve sleeve 7 and the valve core 6 form a slide valve stage structure, which is arranged inside the housing 8. The end cover 1 is arranged on the left side of the housing 8. The spring 3 and the spring seat 5 are arranged inside the housing. The spring seat 5 contacts the left end surface of the valve core 6, one end of the spring 3 contacts the spring seat 5, and the other end contacts the inner hole wall surface of the end cover 1, the proportional electromagnet 11 is arranged on the right side of the housing 8, and the extension rod of the electromagnet 11 contacts the right end surface of the valve core 6, the controller 9 is arranged above the proportional electromagnet 11, and is electrically connected to the proportional electromagnet 11 to control the extension length of the extension rod of the proportional electromagnet 11, two rows of square holes are arranged on the outer circumferential surface of the valve sleeve 7, one row of square holes communicates with the load port A, and the other row of square holes communicates with the load port B, and a plurality of equalizing pressure grooves with different outer circle sizes are arranged on the circumferential surface of the valve core 6.

[0036] The end cover 1 is fixed to the left side of the housing 8 by the end cover mounting screws 2 .

[0037] An end cover sealing ring 4 is arranged between the end cover 1 and the left end surface of the housing 8 .

[0038] The controller 9 is fixed on the proportional solenoid 11 by means of the controller mounting screws 10 .

[0039] The proportional electromagnet 11 is fixed to the housing (8) via the electromagnet mounting screw 12.

[0040] A guard plate 13 is provided at the bottom of the housing 8 , and the guard plate 13 is mounted to the bottom of the housing 8 through bottom mounting screws 14 and nuts 16 .

[0041] A bottom sealing ring 15 is provided between the bottom of the housing 8 and the guard plate 13 .

[0042] The valve sleeve 7 and the valve core 6 are clearance-matched, and the clearance-matching dimension is less than 0.01 mm.

[0043] The square hole size L on the valve sleeve 7 is obtained by machining, and the roughness is 0.4.

[0044] The axial width and radial depth of the pressure equalizing groove should be at least 10 times the fitting clearance between the valve core 6 and the valve sleeve 7.

[0045] Example 1

[0046] The utility model provides a linear direct-drive electro-hydraulic servo proportional valve with a multi-flow series slide valve stage structure; a plurality of square holes arranged on a valve sleeve in the slide valve stage structure are machined to determine different L sizes, so as to realize the output of a plurality of different flow rates of 0 to 100 L / min of the linear direct-drive electro-hydraulic servo proportional valve; a plurality of pressure-equalizing grooves with different outer circle sizes are arranged on a valve core; after the proportional solenoid is powered off, the valve core is pushed to the right by a spring to block the passage of oil in different square holes of the valve sleeve, so as to realize different safety function positions of O, Y and H in the middle position of the electro-hydraulic servo proportional valve, and increase the flow diversity and use safety of the linear direct-drive electro-hydraulic servo proportional valve.

[0047] Figure 1 This is the principle diagram of the linear direct-drive electro-hydraulic servo proportional valve of the multi-flow series slide valve stage structure of the utility model. The valve sleeve 7 and valve core 6 of the linear direct-drive electro-hydraulic servo proportional valve form a slide valve stage structure. The valve sleeve 7 is slowly pressed into the housing 8 on the press. After cleaning, the valve core 6 should fit well when installed into the valve sleeve 7, and the valve core can rotate in any direction. The spring seat 5 and the spring 3 are installed into the housing hole in sequence, and then the end cover 1 is fastened to the housing 8 with the end cover mounting screws 2. The valve core 6 moves from the middle position to the right in the valve sleeve 7, the boss of the valve core 6 opens, and the oil moves from P→B, A→T. The displacement of the valve core 6 is fed back to the internal integrated controller 9 through the proportional solenoid 11 with the LVDT displacement sensor, realizing the internal closed loop, and the output of the flow of the linear direct-drive electro-hydraulic servo proportional valve can be realized.

[0048] Figure 2 , Figure 3 It is a cross-sectional view and schematic diagram of the slide valve stage structure of the utility model. When the system determines the operating speed requirement and safety function position of the actuator, the multiple square holes set in the valve sleeve 7 are machined to determine different L sizes to achieve the output of different flow rates of the linear direct-drive electro-hydraulic servo proportional valve, and the valve core 6 is provided with multiple equalizing grooves with different outer circle sizes. After the proportional electromagnet 11 is powered off, the valve core 6 is pushed to the right by the spring 3 to block the oil from passing through the different square holes of the valve sleeve 7, so as to achieve different safety function positions in the middle position of the electro-hydraulic servo proportional valve.

[0049] Figure 4 It is a schematic diagram of different square holes of the valve sleeve of the utility model. The square hole L1 at one end of the valve sleeve 7 is increased to 3mm, and the proportional electromagnet 11 pushes the valve core 6 to move from the middle position to the right. After the boss is opened, the oil flows from P→B, A→T, and the output flow rate is 24L / min. The square hole L2 at the other end is increased to 5mm, and the proportional electromagnet 11 pushes the valve core 6 to move from the middle position to the left. After the boss is opened, the oil flows from P→A, B→T, and the output flow rate is 40L / min.

[0050] Figure 5-7 , is a comparison diagram of the slide valve stage structure and the power-off safety function position of the utility model. The valve core 6 is provided with a plurality of different equalizing grooves. Each time a groove is opened, the lateral force is reduced to 40% of the case when no groove is opened, three grooves are reduced to 6%, and seven grooves are reduced to 2.7%. After the proportional solenoid 11 is powered off, the valve core is pushed to the right by the spring 3. If the convex shoulder of the valve core 6 is processed to be consistent with the equalizing groove, the P, A, B, and T oil ports are not connected, and the safety function position is "O" type; if the convex shoulder is not processed to be consistent with the equalizing groove, the P port is not connected, the A and B ports are connected with the T port, and the safety function position is "Y" type; if the middle convex shoulder is reduced, the P port is connected with the B port, the A port is connected with the T port, and the safety function position is "H" type.

[0051] The above description of the embodiments is to facilitate the understanding and application of the present invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the embodiments herein, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A linear direct-drive electro-hydraulic servo proportional valve with a multi-flow series slide valve stage structure, characterized in that: It comprises an end cover (1), a spring (3), a spring seat (5), a valve core (6), a valve sleeve (7), a housing (8), a controller (9), and a proportional solenoid (11); The valve core (6) is slidably arranged in the valve sleeve (7). The valve sleeve (7) and the valve core (6) form a sliding valve stage structure and are arranged inside the housing (8). The end cover (1) is arranged on the left side of the housing (8). The spring (3) and the spring seat (5) are arranged inside the housing. The spring seat (5) contacts the left end surface of the valve core (6). One end of the spring (3) contacts the spring seat (5) and the other end contacts the inner hole wall surface of the end cover (1). The proportional electromagnet (11) is arranged on the right side of the housing (8). The extension rod of the proportional electromagnet (11) contacts the right end surface of the valve core (6). The controller (9) is arranged above the proportional electromagnet (11) and is electrically connected to the proportional electromagnet (11) to control the extension length of the extension rod of the proportional electromagnet (11). Two rows of square holes are arranged on the outer circumferential surface of the valve sleeve (7), one row of square holes communicates with the load port A, and the other row of square holes communicates with the load port B. A plurality of equalizing grooves with different outer circumferential sizes are arranged on the circumferential surface of the valve core (6).

2. The linear direct-drive electro-hydraulic servo proportional valve with a multi-flow series slide valve stage structure according to claim 1 is characterized in that: The end cover (1) is fixed to the left side of the housing (8) by means of end cover mounting screws (2).

3. The linear direct-drive electro-hydraulic servo proportional valve with a multi-flow series slide valve stage structure according to claim 1, characterized in that: An end cover sealing ring (4) is arranged between the end cover (1) and the left end surface of the housing (8).

4. The linear direct-drive electro-hydraulic servo proportional valve with a multi-flow series slide valve stage structure according to claim 1, characterized in that: The controller (9) is fixed on the proportional solenoid (11) by means of the controller mounting screws (10).

5. The linear direct-drive electro-hydraulic servo proportional valve with a multi-flow series slide valve stage structure according to claim 1, characterized in that: The proportional electromagnet (11) is fixed to the housing (8) via an electromagnet mounting screw (12).

6. The linear direct-drive electro-hydraulic servo proportional valve with a multi-flow series slide valve stage structure according to claim 1, characterized in that: A guard plate (13) is arranged at the bottom of the housing (8), and the guard plate (13) is mounted to the bottom of the housing (8) via bottom surface mounting screws (14) and nuts (16).

7. The linear direct-drive electro-hydraulic servo proportional valve of the multi-flow series slide valve stage structure according to claim 6, characterized in that: A bottom sealing ring (15) is arranged between the bottom of the housing (8) and the guard plate (13).

8. The linear direct-drive electro-hydraulic servo proportional valve with a multi-flow series slide valve stage structure according to claim 1, characterized in that: The valve sleeve (7) and the valve core (6) are clearance-matched, and the clearance-matching dimension is less than 0.01 mm.

9. The linear direct-drive electro-hydraulic servo proportional valve with a multi-flow series slide valve stage structure according to claim 1, characterized in that: The square hole size L on the valve sleeve (7) is obtained by mechanical processing, and the roughness is 0.

4.

10. The linear direct-drive electro-hydraulic servo proportional valve with a multi-flow series slide valve stage structure according to claim 8, characterized in that: The axial width and radial depth of the pressure equalizing groove should be at least 10 times the matching clearance between the valve core (6) and the valve sleeve (7).

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