A manual device with a mechanical buffer and limit mechanism for a high-frequency actuator

Abstract

The present invention relates to a manual device with a mechanical buffer and limit mechanism for a high-frequency actuator. The present invention includes an actuator handwheel screw rod, a handwheel box body, a support seat, a limit mechanism, and a buffer device; the handwheel box body is connected to the support seat, and the support seat is provided with a buffer device and a limit mechanism for limiting the handwheel screw rod; one end of the handwheel screw rod is connected to the actuator, and the other end is buffered by the buffer device; the manual device further includes a manual switching mechanism and a manual operating mechanism, the manual switching mechanism includes a transmission nut, a manual switching pin, a driving pin, and a driving block, the transmission nut is connected to the handwheel screw rod, and the driving pin is connected to the transmission nut. The present invention adopts an integrated structure, greatly reducing the installation space of the actuator; not only has low design and manufacturing costs, complete functions, and simple operation, but also can greatly improve the action life and action smoothness of the valve and the cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic actuators for control valves, and particularly to a manual device with a mechanical buffer limit mechanism for a high-frequency actuator. Background Art

[0002] With the rapid development of industrial automation technology, in order to meet various special working conditions in chemical plants, it is required that valves can still meet the requirements of fast action, long service life, and easy automatic and manual switching control under the condition of high-frequency operation. Under such working conditions with multiple requirements, a pneumatic actuator with a high-frequency operation and a manual control device suitable for this working condition must be used as the valve driving device, while ordinary pneumatic actuators are difficult to meet the requirements of fast action, high frequency, long life, and manual operation at the same time.

[0003] In actual use, most additional functions of pneumatic actuators generally only include two of mechanical adjustable limit, buffer device, and manual control device, or are independently designed and installed in separate areas by other additional installation methods, making it difficult to achieve synchronous coexistence. At this time, compared with general pneumatic actuator products, the product structure is complex and the operation steps are cumbersome. At the same time, due to the overly large volume, it cannot be normally installed under certain special working conditions, resulting in the product function not fully meeting customer needs, or the manufacturing cost is high. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a manual device with a mechanical buffer limit mechanism for a high-frequency actuator to make up for the functional defects of existing pneumatic actuators, which has a simple structure, a small installation space, easy operation, safety and reliability, and simple maintenance.

[0005] The present invention provides a manual device with a mechanical buffer limit mechanism for a high-frequency actuator, including an actuator handwheel screw rod, a handwheel box body, a support seat, a limit mechanism, and a buffer device; the handwheel box body is connected to the support seat, and the support seat is provided with a buffer device and a limit mechanism for limiting the handwheel screw rod;

[0006] One end of the handwheel screw rod is connected to the actuator, and the other end is buffered by the buffer device;

[0007] The manual device further includes a manual switching mechanism and a manual operation mechanism. The manual switching mechanism includes a transmission nut, a manual switching pin, a driving pin, and a driving block. The transmission nut is connected to the handwheel screw rod, the driving pin is connected to the transmission nut, and the manual switching pin is used for inserting and connecting with the driving block. By rotating the position of the manual switching pin, the driving pin is separated from or connected to the driving block;

[0008] The manual operating mechanism is used to drive the transmission nut to rotate when the driving pin is disengaged from the driving block, so as to move the handwheel screw rod.

[0009] In an embodiment of the present invention, the manual operating mechanism includes a bevel gear, a driven gear, and an operating handwheel disc. The bevel gear meshes with the driven gear. The transmission nut is connected to the bevel gear, and the operating handwheel disc is connected to the driven gear.

[0010] In an embodiment of the present invention, the transmission nut and the handwheel screw rod are connected by a trapezoidal thread.

[0011] In an embodiment of the present invention, it further includes a connecting bolt and a locking nut. The connecting bolt is threadedly connected to the handwheel screw rod, and the handwheel screw rod is integrally connected to the actuator through the locking nut.

[0012] In an embodiment of the present invention, the driving block is provided with an eccentric guide rail structure. By manually switching the rotation of the insertion pin to drive the driving block, the driving pin moves in the eccentric groove of the eccentric guide rail. As the driving pin moves, the transmission nut is connected to or separated from the driving block.

[0013] In an embodiment of the present invention, the support seat is provided with a slot for inserting the driving pin.

[0014] In an embodiment of the present invention, the buffer device includes a buffer block, a push rod, a return spring, a housing, a piston, a cavity, and an adjustment base. A cavity is provided inside the housing. The cavity includes an inner cavity and an outer cavity. The buffer block, the push rod, and the piston are connected in sequence. The piston slides in the inner cavity. Both ends of the return spring are respectively connected to the buffer block and one end of the cavity. The adjustment base is provided at the other end of the cavity. The adjustment base is provided with an overflow hole, and a through hole is provided at the side end of the piston.

[0015] In an embodiment of the present invention, a sponge is provided in the outer cavity, and the pressure of the outer cavity is changed by the amount of hydraulic oil absorbed by the sponge.

[0016] In an embodiment of the present invention, the limiting mechanism includes a limiting screw rod and a limiting adjustment sleeve. The limiting adjustment sleeve is threadedly connected to the limiting screw rod. The limiting screw rod is threadedly connected to the support seat, and the housing is provided inside the limiting screw rod.

[0017] In an embodiment of the present invention, when the buffer stroke ends, mechanical limiting is achieved by the contact positioning of the handwheel screw rod and the limiting screw rod.

[0018] The above technical solutions of the present invention have the following advantages compared with the prior art:

[0019] The manual device of the high-frequency actuator with a mechanical buffer and limit mechanism in the present invention adopts an integrated structure, greatly reducing the installation space of the actuator; the manual and automatic states can be easily switched through an external switching pin; the mechanical limit structure is simple and convenient to operate, and can be adjusted at any time online and offline; the buffer device achieves the buffering effect through the flow rate of hydraulic oil, with small wear and long service life, which well reduces the loss during the movement of the high-frequency actuator and greatly improves the service life of the actuator; this set of devices not only has low design and manufacturing costs, complete functions, and simple operation, but also can greatly improve the action life and action stability of valves and cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the content of the present invention easier to be clearly understood, the following further details the present invention according to the specific embodiments of the present invention in conjunction with the drawings, where

[0021] Figure 1 is the main structural view of the manual device of the present invention.

[0022] Figure 2 is Figure 1 the enlarged schematic view at position A in

[0023] Figure 3 is the schematic view of the cooperation between the transmission nut and the driving block of the present invention.

[0024] Figure 4 is the schematic view of the limit mechanism of the present invention.

[0025] Figure 5 is the schematic view of the buffer device of the present invention.

[0026] Figure 6 is the partial structural schematic view of the buffer device of the present invention.

[0027] Explanation of the reference numerals in the drawings of the specification: 1. Connecting bolt; 2. Jam nut; 3. Handwheel screw rod; 4. Handwheel box body; 5. Bevel gear; 6. Transmission nut; 7. Driving block; 7-1. Eccentric guide rail structure; 8. Support seat; 9. Buffer device; 9-1. Buffer block; 9-2. Push rod; 9-3. Return spring; 9-4. Outer shell; 9-5. Piston; 9-6. Inner cavity; 9-7. Outer cavity; 9-8. Adjusting base; 9-9. Sponge; 9-10. Overflow hole; 10. Limit mechanism; 10-1. Limit screw rod; 10-2. Limit adjusting sleeve; 11. Manual switching pin; 12. Driving pin; 13. Driven gear; 14. Handwheel disc. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following further describes the present invention in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the embodiments given are not intended to limit the present invention.

[0029] As Figures 1-6 shown, a manual device with a mechanical buffer and limit mechanism for a high-frequency actuator of the present invention includes an actuator, a handwheel screw rod 3, a handwheel housing 4, a support seat 8, and a limit mechanism 10;

[0030] The handwheel housing 4 is connected to the support seat 8, and a buffer device 9 and a limit mechanism 10 for limiting the handwheel screw rod 3 are installed on the support seat 8;

[0031] One end of the handwheel screw rod 3 is connected to the actuator, and the other end is buffered by the buffer device 9;

[0032] The manual device further includes a manual switching mechanism and a manual operating mechanism. The manual switching mechanism includes a transmission nut 6, a manual switching pin 11, a driving pin 12, and a driving block 7. The transmission nut 6 is connected to the handwheel screw rod 3, the driving pin 12 is connected to the transmission nut 6, and the manual switching pin 11 is used for plug-in connection with the driving block 7. By rotating the position of the manual switching pin 11, the driving pin 12 is disengaged or connected from the driving block 7;

[0033] The manual operating mechanism is used to drive the transmission nut 6 to rotate when the driving pin 12 is disengaged from the driving block 7, so as to move the handwheel screw rod 3.

[0034] Specifically, the manual operating mechanism includes a bevel gear 5, a driven gear 13, and an operating handwheel disc 14. The bevel gear 5 is engaged with the driven gear 13, the transmission nut 6 is connected to the bevel gear 5, and the operating handwheel disc 14 is connected to the driven gear 13.

[0035] Specifically, the transmission nut 6 is connected to the handwheel screw rod 3 by a trapezoidal thread, and the transmission nut 6 is installed inside the bevel gear 5.

[0036] Specifically, it further includes a connecting bolt 1 and a jamming nut 2. The connecting bolt 1 is threadedly connected to the handwheel screw rod 3, and the handwheel screw rod 3 is integrally connected to the actuator through the jamming nut 2.

[0037] Specifically, the driving block 7 is provided with an eccentric guide rail structure 7-1. By rotating the driving block 7 with the manual switching pin 11, the driving pin 12 moves in the eccentric groove of the eccentric guide rail structure 7-1. As the driving pin 12 moves, the transmission nut 6 is connected or separated from the driving block 7. The support seat 8 is provided with a slot for inserting the driving pin 12.

[0038] When automatically switched to the manual state, the bevel gear 55 is connected to the actuator through the handwheel housing 44. Operate the manual switching pin 11 to rotate the driving block 7. When rotating, the nut is closed through the driving pin 12 connected to the transmission nut 6. After closing, the transmission nut 6 is threadedly connected to the handwheel screw rod 3, and at this time, manual operation can be carried out.

[0039] In the manual state, operate the handwheel disc 14, the driven gear 13 rotates to drive the bevel gear 5 to rotate, and the transmission nut 6 is installed in the bevel gear 5 and rotates together. The handwheel screw rod 3 cannot rotate due to the anti-rotation structure of the handwheel housing 4, and thus is converted into an axial linear motion.

[0040] Specifically, the buffer device 9 includes a buffer block 9-1, a push rod 9-2, a return spring 9-3, a housing 9-4, a piston 9-5, a cavity, and an adjustment base 9-8. A cavity is provided inside the housing 9-4. The cavity includes an inner cavity 9-6 and an outer cavity 9-7. The buffer block 9-1, the push rod 9-2, and the piston 9-5 are connected in sequence. The piston 9-5 slides in the inner cavity 9-6. Both ends of the return spring 9-3 are respectively connected to the buffer block 9-1 and one end of the cavity. The adjustment base 9-8 is provided at the other end of the cavity. The adjustment base 9-8 is provided with an overflow hole 9-10, and a through hole is provided at the side end of the piston 9-5. Through the above settings, in the pneumatic state, the handwheel screw rod 3 reciprocates axially with the actuator. The other end of the handwheel screw rod 3 contacts the buffer device 9. When the handwheel screw rod 3 reciprocates and contacts the buffer block 9-1 of the buffer device 9, the push rod 9-2 will drive the piston 9-5 to compress the volume of the inner cavity 9-6 and discharge the hydraulic oil in the inner cavity 9-6 to the outer cavity 9-7 through the overflow hole 9-10 on the adjustment base 9-8, thereby forming an oil pressure resistance to achieve the buffering function of the device. When the handwheel screw rod 3 reciprocates and returns to its position, the hydraulic oil in the outer cavity 9-7 of the buffer device 9 flows back to the inner cavity 9-6 through the through hole at the side end of the piston 9-5. When the chamber pressure is balanced, the return spring 9-3 returns the piston 9-5 through the push rod 9-2, so that the buffer device 9 returns to its original position.

[0041] Specifically, a sponge 9-9 is provided in the outer cavity 9-7, and the pressure of the outer cavity 9-7 is changed by absorbing the amount of hydraulic oil by the sponge 9-9.

[0042] Specifically, the limiting mechanism 10 includes a limiting screw rod 10-1 and a limiting adjustment sleeve 10-2. The limiting adjustment sleeve 10-2 is threadedly connected to the limiting screw rod 10-1. The limiting screw rod 10-1 is threadedly connected to the support seat 8. The housing 9-4 is provided inside the limiting screw rod 10-1. When the buffering stroke ends, mechanical limiting is achieved by the contact positioning of the handwheel screw rod 3 and the limiting screw rod 10-1. The limiting mechanism 10 realizes the adjustable mechanical limiting function by adjusting the length through the thread of the limiting adjustment sleeve 10-2.

[0043] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A manual device with a mechanical buffer and limit mechanism for a high-frequency actuator, comprising an actuator, characterized in that, It further includes: a handwheel screw rod (3), a handwheel housing (4), a support seat (8), a buffer device (9), and a limit mechanism (10); the handwheel housing (4) is connected to the support seat (8), and the buffer device (9) and a limit mechanism (10) for limiting the handwheel screw rod (3) are installed on the support seat (8); one end of the handwheel screw rod (3) is connected to the actuator, and the other end is buffered by the buffer device (9); the manual device further includes a manual switching mechanism and a manual operating mechanism. The manual switching mechanism includes a transmission nut (6), a manual switching pin (11), a driving pin (12), and a driving block (7). The transmission nut (6) is connected to the handwheel screw rod (3), the driving pin (12) is connected to the transmission nut (6), and the manual switching pin (11) is used for plug-in connection with the driving block (7). By rotating the position of the manual switching pin (11), the driving pin (12) is disengaged or connected from the driving block (7); the manual operating mechanism is used to drive the transmission nut (6) to rotate when the driving pin (12) is disengaged from the driving block (7), so as to move the handwheel screw rod (3); the driving block (7) is provided with an eccentric guide rail structure (7-1). By rotating the driving block (7) with the manual switching pin (11), the driving pin (12) moves in the eccentric groove of the eccentric guide rail structure (7-1). As the driving pin (12) moves, the transmission nut (6) is connected or separated from the driving block (7); the buffer device (9) includes a buffer block (9-1), a push rod (9-2), a return spring (9-3), a housing (9-4), a piston (9-5), a cavity, and an adjusting base (9-8). A cavity is provided inside the housing (9-4). The cavity includes an inner cavity (9-6) and an outer cavity (9-7). The buffer block (9-1), the push rod (9-2), and the piston (9-5) are connected in sequence. The piston (9-5) slides in the inner cavity (9-6). Both ends of the return spring (9-3) are respectively connected to the buffer block (9-1) and one end of the cavity. The adjusting base (9-8) is provided at the other end of the cavity. The adjusting base (9-8) is provided with an overflow hole (9-10), and a through hole is provided on the side end of the piston (9-5).

2. The manual device with a mechanical buffer and limit mechanism for a high-frequency actuator according to claim 1, characterized in that the manual operating mechanism includes a bevel gear (5), a driven gear (13), and an operating handwheel disc (14). The bevel gear (5) meshes with the driven gear (13). The transmission nut (6) is connected to the bevel gear (5), and the operating handwheel disc (14) is connected to the driven gear (13).

3. A manual device with a mechanical buffer and limit mechanism for a high-frequency actuator according to claim 1, characterized in that, the transmission nut (6) is connected to the handwheel screw rod (3) by a trapezoidal thread, and the transmission nut (6) is installed inside the bevel gear (5).

4. A manual device with a mechanical buffer and limit mechanism for a high-frequency actuator according to claim 1, characterized in that, It further includes a connecting bolt (1) and a jamming nut (2). The connecting bolt (1) is threadedly connected to the handwheel screw rod (3), and the handwheel screw rod (3) is integrally connected to the actuator through the jamming nut (2).

5. A manual device with a mechanical buffer and limit mechanism for a high-frequency actuator according to claim 1, characterized in that, The support seat (8) is provided with a slot for inserting the driving pin (12).

6. A manual device with a mechanical buffer and limit mechanism for a high-frequency actuator according to claim 1, characterized in that, A sponge (9-9) is provided in the outer cavity (9-7), and the pressure of the outer cavity (9-7) is changed by the amount of hydraulic oil absorbed by the sponge (9-9).

7. A manual device with a mechanical buffer and limit mechanism for a high-frequency actuator according to claim 1, characterized in that, The limiting mechanism (10) includes a limiting lead screw (10-1) and a limiting adjusting sleeve (10-2). The limiting adjusting sleeve (10-2) is threadedly connected to the limiting lead screw (10-1). The limiting lead screw (10-1) is threadedly connected to the support base (8), and the outer shell (9-4) is provided in the limiting lead screw (10-1).

8. A manual device with a mechanical buffer and limit mechanism for a high-frequency actuator according to claim 7, characterized in that, After the buffer stroke is completed, mechanical limitation is achieved by the contact positioning of the handwheel lead screw (3) and the limiting lead screw (10-1).

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