Structure for enhancing stability of telescopic rod and manual shifting fork actuator

Abstract

The manual shifting fork actuator comprises an actuator cylinder body, one end of the actuator cylinder body is provided with a valve body box in a linkage mode through a spring piston rod moving in the actuator cylinder body, one face of the valve body box is provided with a guide plate in a sealed mode, and the other face of the valve body box is provided with a telescopic rod. A guide plate is arranged in the valve body box, a telescopic rod extending into the valve body box is guided into the guide plate, the telescopic rod in the actuator is guided through the guide plate, the freedom degree of the telescopic rod in the circumferential direction can be compressed, and the anti-inclination and guiding effects on the telescopic rod are achieved; a sealing cleaning rubber ring arranged in a rubber ring assembling groove can be used for scraping and cleaning dust and impurities attached to the surface of the telescopic rod in the moving process, and friction between the telescopic rod and a cylinder body can be reduced in the moving process of the telescopic rod in the valve body box. And the problems of loosening, falling and breakage caused by a gap between the telescopic rod and the cylinder body are effectively prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of actuators, and in particular relates to a structure for enhancing the stability of a telescopic rod and a manual shift fork actuator. Background Art

[0002] Pneumatic actuators are sometimes equipped with certain auxiliary devices. Commonly used ones are valve positioners and handwheel mechanisms. The role of the valve positioner is to use the feedback principle to improve the performance of the actuator so that the actuator can achieve accurate positioning according to the control signal of the controller. The role of the handwheel mechanism is to use it to directly manipulate the control valve to maintain normal production when the control system fails due to power outages, gas outages, no output of the controller or failure of the actuator. The regulating valve is the regulating part of the pneumatic actuator. Under the action of the thrust of the actuator, the regulating valve produces a certain displacement or angle of rotation to directly adjust the flow of the fluid. The pneumatic device is mainly composed of a cylinder, a piston, a gear shaft, an end cover, a seal, a screw, etc., and the gear shaft transmission has a long cylinder stroke and a large damping between the gear transmission, resulting in a slow valve response speed, a relatively complex transmission and structure, and a high manufacturing cost; the load-bearing capacity and strength are not high, resulting in reduced reliability.

[0003] To this end, a slewing fork pneumatic actuator with the announcement number "CN209414727U" comprises a spring cylinder, a valve body and a cylinder body, wherein a valve cover is installed on the valve body, and a valve shaft turntable is provided on the valve cover, and an axial hole is provided at the middle position of the valve shaft turntable, and the inner wall of the axial hole is rotatably connected with the valve shaft; the utility model is provided with a slewing fork inside the valve body, and a pin is provided on the piston rod, and the pin slides on the inner wall of the pin, and when the piston rod moves axially, the slewing fork is driven by the pin to swing at an angle, thereby realizing the rotation of the valve shaft installed on the slewing fork, because the U-shaped claw and the rotation center of the slewing fork form a transmission principle of a labor-saving lever, when the piston rod slides with a longer stroke, the U-shaped claw has little resistance, so the rotation response speed of the valve shaft is fast; and the structure is simple and reliable, and they are all one-piece castings with low manufacturing cost; and at the same time, it has high load-bearing capacity and reliable transmission, so it has good market promotion value.

[0004] However, for the above-mentioned slewing fork type pneumatic actuator, although a pin is provided on the piston rod, and the pin slides on the inner wall of the pin, when the piston rod moves axially, the slewing fork is driven by the pin to swing at an angle, there are still the following obvious defects during use: the piston rod of the actuator is subjected to alternating loads during extension and retraction, and the reciprocating extension and retraction of the piston rod will generate greater friction with dust and impurities, thereby generating a certain gap and shaking between the piston rod and the cylinder body, and the thread at one end of the shaking piston rod will loosen and fall off. Utility Model Content

[0005] The purpose of the utility model is to provide a structure for enhancing the stability of a telescopic rod and a manual fork actuator, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the utility model provides the following technical solution: a structure for enhancing the stability of a telescopic rod, comprising:

[0007] An actuator cylinder, one end of which is linked to a valve body box by a spring piston rod moving inside the actuator cylinder, one side of which is sealed with a guide plate, and a telescopic rod extending to the inside of the valve body box is passed into the guide plate, and one end of the telescopic rod passes through the guide plate and extends out of a side flange provided outside the valve body box;

[0008] A positioning seat, the positioning seat is fixed at the center position of the surface of the guide plate through the telescopic rod, and a sealing and cleaning rubber ring is provided in a groove on one side of the positioning seat to prevent dust and clean dust. One end of the telescopic rod located inside the valve body box is connected to a guide block, and the guide block guides and slides at the top end inside the valve body box.

[0009] Preferably, an oil-free bushing is installed in the hole provided in the center position of the guide plate, and the oil-free bushing is sleeved on the surface of the telescopic rod, which has the effect of achieving gap friction on the telescopic rod during the telescopic process, thereby ensuring the smooth and stable telescopic movement of the telescopic rod.

[0010] Preferably, an outer side of the positioning seat is provided with an inwardly recessed rubber ring assembly groove, and the sealing and cleaning rubber ring passes through the telescopic rod and is installed inside the rubber ring assembly groove to clean dust and impurities attached to the surface of the telescopic rod. It can be used to clean mixed impurities attached to the surface of the telescopic rod during the reciprocating extension and retraction of the telescopic rod, thereby reducing the friction between the valve body box and the telescopic rod.

[0011] Preferably, the telescopic rod is locked on the guide block through one end with a thread, and the outer side of the guide block is locked and fixed through a hexagon socket fastening screw passing through the telescopic rod. The fixing method of the telescopic rod can effectively prevent loosening and falling off.

[0012] Preferably, one end of the telescopic rod located outside the valve body box is connected to a transition shaft, and a cylindrical head screw with a hexagon socket is inserted into a concave cavity at one end of the transition shaft to lock the transition shaft on the telescopic rod. The transition shaft can be freely adjusted by the user according to actual needs to compensate for various accumulated errors.

[0013] Preferably, the guide plate is fixed on one side of the valve body box to compress the circumferential freedom of the telescopic rod, and play a role in preventing the telescopic rod from tilting and guiding, reducing the gap between the telescopic rods and preventing them from breaking and deforming when the load is large.

[0014] In addition, in order to achieve the above-mentioned purpose, the utility model also provides a manual fork actuator, which includes the above-mentioned structure for enhancing the stability of the telescopic rod.

[0015] Compared with the prior art, the technical effects and advantages of the utility model are as follows: the structure for enhancing the stability of the telescopic rod and the manual fork actuator, through the positioning seat on the guide plate on one side of the valve body box, and the combination of the sealing and cleaning rubber ring in the rubber ring mounting groove of the positioning seat and the telescopic rod extension and retraction, the telescopic rod in the actuator is guided by the guide plate, and can be used to compress the degree of freedom of the telescopic rod in the circumferential direction, and achieve the function of anti-tilting and guiding the telescopic rod, at the same time, in the process of positioning and retracting the telescopic rod in the positioning seat, the sealing and cleaning rubber ring arranged in the rubber ring assembly groove can be used to scrape and clean the dust and impurities attached to the surface of the telescopic rod in motion, and the friction between the telescopic rod and the cylinder body can be reduced during the movement of the telescopic rod in the valve body box, effectively preventing the telescopic rod from loosening, falling off and breaking due to the gap between the telescopic rod and the cylinder body.

[0016] Through the combined use of the telescopic rod, guide block, valve body box, guide plate, transition shaft and hexagon socket set screws, the telescopic rod is locked on the guide block through threads and fixed on the plane of the guide block by the hexagon socket set screws, and extends into the telescopic rod body to prevent loosening and falling off. At the same time, the oil-free bushing is pressed into the inside of the guide plate, and the guide plate is fixed to the side flange of the valve body box by hexagonal bolts. The telescopic rod passes through the oil-free bushing and extends out of the side flange of the valve body. At this time, the guide plate is used to compress the degree of freedom of the telescopic rod in the circumferential direction to prevent tilting and guide. Because the side flange space on the valve body box is limited, the guide plate can also play a transition role, reserving customer-customized connection dimensions, and the telescopic rod can receive the unbalanced force loaded by the multi-link mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the main structure of the actuator of the utility model;

[0018] Figure 2 It is a schematic diagram of the cross-sectional structure of the guide plate of the utility model.

[0019] In the figure: 1. Actuator cylinder; 2. Spring piston rod; 3. Valve body box; 4. Guide plate; 5. Telescopic rod; 6. Positioning seat; 7. Sealing cleaning rubber ring; 8. Guide block; 9. Transition shaft; 10. Oil-free bushing; 11. Rubber ring assembly groove; 12. Cylindrical head screw. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-2 The utility model provides a technical solution: a structure for enhancing the stability of a telescopic rod, comprising:

[0022] An actuator cylinder 1, one end of the actuator cylinder 1 is linked with a valve body box 3 through a spring piston rod 2 moving inside the actuator cylinder 1, a valve cover is provided at the front of the valve body box 3, the valve cover is provided with a valve shaft turntable, a valve shaft extending into the valve body box 3 is movably provided in the valve shaft turntable, one end of the valve shaft is linked with a fork member, the fork member is linked with a telescopic rod 5 and a spring piston rod 2, one end of the spring piston rod 2 is rotatably connected with a rotating screw rod, the rotating screw rod extends to the outside through a threaded sleeve on the inner wall of the actuator cylinder 1 and is fixed with a rotating handle member for manually pulling the fork of the actuator, one side of the valve body box 3 is sealed with a guide plate 4, and a telescopic rod 5 extending into the valve body box 3 is introduced into the guide plate 4, so that the telescopic rod 5 can play a guiding role during work and enhance the stability of the telescopic rod 5, one end of the telescopic rod 5 passes through the guide plate 4 and extends out of the side flange provided outside the valve body box 3;

[0023] A positioning seat 6, wherein the positioning seat 6 passes through the telescopic rod 5 and is fixed at the center position of the surface of the guide plate 4, and the positioning seat 6 is fixed by screws, and can cooperate with the guide plate 4 to enhance the stability of the telescopic rod 5, and a sealing and cleaning rubber ring 7 for preventing dust and cleaning dust is provided in a groove on one side of the positioning seat 6, so that the dust and impurities attached to the surface of the telescopic rod 5 can be cleaned, and the friction force on the surface of the telescopic rod 5 can be reduced. The end of the telescopic rod 5 located inside the valve body box 3 is connected to a guide block 8, and the guide block 8 guides and slides at the top end inside the valve body box 3, so that the telescopic rod 5 can play an anti-tilt guiding role during work, and an oil-free bushing 10 is installed in the hole provided in the center position of the guide plate 4, and the oil-free bushing 10 is sleeved on the surface of the telescopic rod 5, which can reduce the friction between the surface of the telescopic rod 5 and the contact surface of the valve body box 3, and reduce the occurrence of gaps.

[0024] One side of the outer side of the positioning seat 6 is provided with an inwardly concave rubber ring assembly groove 11, and the sealing cleaning rubber ring 7 can be installed inside the rubber ring assembly groove 11, and the two surfaces of the sealing cleaning rubber ring 7 are inclined to be close to the inner ring, which is conducive to the sealing cleaning rubber ring 7 and The surface of the telescopic rod 5 is fully in contact, and the dust and impurities are scraped off. The sealing cleaning rubber ring 7 is made of rubber material. The sealing cleaning rubber ring 7 passes through the telescopic rod 5 and is installed in the rubber ring assembly groove 11 to clean the dust and impurities attached to the surface of the telescopic rod 5. The retractable rod 5 is locked on the guide block 8 through one end with a thread, and the outer side of the guide block 8 is locked and fixed through the telescopic rod 5 by a hexagon socket fastening screw. The end of the telescopic rod 5 located outside the valve body box 3 is connected to a transition shaft 9, and a hexagon socket cylindrical head screw 12 is inserted into the concave cavity at one end of the transition shaft 9 to lock the transition shaft 9 on the telescopic rod 5. The guide plate 4 is fixed to one side of the valve body box 3 to compress the circumferential freedom of the telescopic rod 5, and plays a role in preventing the telescopic rod 5 from tilting and guiding it.

[0025] In addition, in order to achieve the above-mentioned purpose, the utility model also provides a manual fork actuator, which includes the above-mentioned structure for enhancing the stability of the telescopic rod.

[0026] Specifically, when in use, the telescopic rod 5 is screwed on the guide block 8, and the guide block 8 is fixed to the inside of one side by screws, which can prevent one end of the telescopic rod 5 from loosening and falling off on the guide block 8, and the oil-free bushing 10 is pressed into the inner hole at the center of the guide plate 4, which can prevent the telescopic rod 5 from having a certain gap with the valve body box 3 during the telescopic process, and the guide plate 4 is fixed to the flange on one side of the valve body box 3 by hexagonal bolts, which plays a guiding role for the telescopic rod 5. The guide plate 4 is used to compress the circumferential degree of freedom of the telescopic rod 5, and only retains the axial degree of freedom to prevent the telescopic rod 5 from tilting and guiding. The guide plate 4 plays a transitional role because the flange space on the side of the valve body box 3 is limited. At this time, the telescopic rod 5 can always remain in a straight line during the movement of the positioning seat 6, and will not tilt. At the same time, the sliding of the telescopic rod 5 in the sealing cleaning rubber ring 7 can clean and scrape the telescopic rod 5 with dust and impurities attached to it during the retraction process into the valve body box 3. The extension and retraction of the telescopic rod 5 can make the sealing cleaning rubber ring 7 continuously fit and swing, which can reduce the dust from entering the interior of the valve body box 3 and effectively reduce the friction of the telescopic rod 5, which causes a certain gap and causes shaking and tilting.

[0027] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A structure for enhancing the stability of a telescopic rod, characterized in that: include: An actuator cylinder (1), one end of the actuator cylinder (1) is linked with a valve body box (3) through a spring piston rod (2) moving inside the actuator cylinder (1), one side of the valve body box (3) is sealed with a guide plate (4), and a telescopic rod (5) extending into the inside of the valve body box (3) is passed through the guide plate (4), and one end of the telescopic rod (5) passes through the guide plate (4) and extends out of a side flange provided outside the valve body box (3); A positioning seat (6), the positioning seat (6) passes through the telescopic rod (5) and is fixed at the center position of the surface of the guide plate (4), and a sealing and cleaning rubber ring (7) for preventing dust and cleaning dust is provided in a groove on one side of the positioning seat (6), and one end of the telescopic rod (5) located inside the valve body box (3) is connected to a guide block (8), and the guide block (8) slides in a guided manner at the top end inside the valve body box (3).

2. A structure for enhancing the stability of a telescopic rod according to claim 1, characterized in that: An oil-free bushing (10) is installed in a hole provided in the center of the guide plate (4), and the oil-free bushing (10) is sleeved on the surface of the telescopic rod (5).

3. The structure for enhancing the stability of a telescopic rod according to claim 1, characterized in that: An inwardly recessed rubber ring assembly groove (11) is provided on one side of the exterior of the positioning seat (6); the sealing and cleaning rubber ring (7) passes through the telescopic rod (5) and is installed inside the rubber ring assembly groove (11) to clean dust and impurities attached to the surface of the telescopic rod (5).

4. The structure for enhancing the stability of a telescopic rod according to claim 1, characterized in that: The telescopic rod (5) is locked on the guide block (8) via one end with a thread, and the outer side of the guide block (8) is locked and fixed by passing a hexagon socket fastening screw through the telescopic rod (5).

5. The structure for enhancing the stability of a telescopic rod according to claim 1, characterized in that: One end of the telescopic rod (5) located outside the valve body box (3) is connected to a transition shaft (9); a hexagon socket head screw (12) is inserted into a concave cavity at one end of the transition shaft (9) to lock the transition shaft (9) onto the telescopic rod (5).

6. The structure for enhancing the stability of a telescopic rod according to claim 1, characterized in that: The guide plate (4) is fixed to one side of the valve body box (3) to compress the degree of freedom of the telescopic rod (5) in the circumferential direction, and plays a role in preventing the telescopic rod (5) from tilting and guiding it.

7. A manual fork actuator, characterized in that: The manual fork actuator comprises the structure for enhancing the stability of the telescopic rod according to any one of claims 1 to 6.

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