An indicating mechanism for an electric actuator

Abstract

The present invention relates to the technical field of valve indicators, and specifically proposes an electric actuator indicating mechanism; comprising a base for fixed installation, a shell fixed on the base, an indicating seat fixed on the outer end of the shell, an adjustable scale mounted on the indicating seat, a window cover fixed on the indicating seat, the adjustable scale visually enclosed in the window cover; an indicating assembly for indicating the scale value on the adjustable scale is installed in the shell. The indicating mechanism provided by the present invention improves the comprehensive performance of the indicator through the design of efficient lubrication and convenient calibration, and indirectly ensures the indicating accuracy and service life of the indicator.

Description

Technical Field

[0001] The invention relates to the technical field of valve indicators, and specifically proposes an indicating mechanism for an electric actuator. Background Art

[0002] The electric actuator indicator is a device used to display the working status of the electric actuator. It is usually installed on the outside of the electric actuator and can intuitively provide the operator with information about the current status of the actuator, such as the opening of the valve, whether the actuator is operating, whether there is a fault, etc.

[0003] Electric actuator indicators can be divided into electronic and mechanical types. Electronic indicators are generally connected to the position sensor inside the electric actuator to receive the sensor's signal and convert it into a corresponding indication signal. Mechanical indicators are generally connected to the electric actuator's drive shaft or the valve shaft of the valve, and directly display the actuator's execution status through pointer scales and other means.

[0004] The mechanical electric actuator indicator is internally installed with a corresponding mechanical transmission structure, which is used to indirectly drive the pointer to move and then indicate the corresponding scale. In order to prevent dust and other impurities from entering the indicator, the mechanical transmission mechanism and the scale are installed in the housing. The existing indicator has the following problems in its composition structure and assembly method.

[0005] 1) The indicator responds repeatedly to the electric actuator or valve for a long time, and the internal mechanical transmission structure will have mechanical wear, stagnation, etc., and the indication accuracy will decrease accordingly, so that the pointer indication cannot accurately reflect the actual position of the valve, which will cause information acquisition errors and serious production accidents. Therefore, it is generally calibrated regularly, and the scales in the existing indicators are mostly fixed in the shell. When calibrating, you can only disassemble the external shell and then calibrate the position of the scale. After the calibration is completed, the shell needs to be sealed again, which is troublesome and the calibration efficiency is low. In addition, tools must be used to disassemble and install the shell.

[0006] 2) In order to reduce internal mechanical wear and ensure indication accuracy, most existing indicators have corresponding lubricating oil holes on the shell. When lubrication is needed, lubricating oil is directly injected into the lubricating oil hole, so that the lubricating oil naturally flows to the mechanical transmission position. This design, on the one hand, requires more lubricating oil for lubrication, and on the other hand, only part of the lubricating oil reaches the mechanical transmission position, and the actual utilization rate of the lubricating oil is low. Summary of the invention

[0007] In order to solve the above problems, the present invention provides an electric actuator indicating mechanism for solving the problems mentioned in the above background technology.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme to achieve: an electric actuator indicating mechanism, comprising a base for fixed installation, a shell fixed on the base, an indicating seat fixed on the outer end of the shell, an adjustable scale mounted on the indicating seat, a window cover also fixed on the indicating seat, the adjustable scale visually enclosed in the window cover; an indicating assembly for indicating the scale value on the adjustable scale is installed in the shell.

[0009] The indicating assembly includes a driving sleeve rotatably mounted in the base, a stroke shaft being threadedly mounted at the central axis of the driving sleeve, the stroke shaft passing through the outer shell and extending into the window cover, a bent pointer for indicating the scale value on the adjustable scale being fixed on one end of the stroke shaft extending into the window cover; a guide frame slidably matched with the inside of the outer shell being fixed on the stroke shaft, a lubrication channel being provided between the guide frame and the outer shell, an oil seal hole docking with the lubrication channel port being provided on the indicating seat, the lubrication oil flowing outward along the lubrication channel through the oil seal hole, an oil seal bolt being installed through the oil seal hole, the oil seal bolt being threadedly connected to the outer shell, and the oil seal bolt fixing the indicating seat to the outer shell.

[0010] The adjustable scale comprises an adjustable base mounted on the indicating seat and a scale fixed on the adjustable base. The adjustable base drives the scale to move and adjust in the axial direction of the stroke shaft.

[0011] Preferably, the guide frame includes a fixed base block fixed on the stroke shaft, a guide rod arranged parallel to the stroke shaft is fixed on the fixed base block, the guide rod is a round tube structure, an oil passage connected with the guide rod and guiding the stroke shaft is arranged in the fixed base block; a conduit slidingly matched with the guide rod is arranged in the outer shell, one end of the conduit is connected at the end face of the outer shell; the oil seal hole is connected to the conduit port, and the oil seal bolt is threadedly connected in the conduit.

[0012] Preferably, the outer end surface of the shell is provided with a step groove, the indicating seat is embedded in the step groove, at least one positioning pin is fixed in the step groove, and the indicating seat is provided with a positioning hole for inserting the positioning pin.

[0013] Preferably, a avoidance groove is provided on the end face of the indicating seat embedded in the step groove, and a square guide hole is provided through the avoidance groove; the adjustable base includes a connecting plate located in the avoidance groove, a slider is fixed on the connecting plate and is slidably installed in the guide hole, a scale base is fixed on one end of the slider extending out of the guide hole, and the scale is fixed on the scale base; an adjusting screw threadedly connected to the indicating seat is also rotatably installed on the connecting plate.

[0014] Preferably, both sides of the scale are marked with scales; the bending pointer is provided with two pointer heads, and the scale is located between the two pointer heads.

[0015] Preferably, a guide groove is provided on one end of the driving sleeve close to the guide frame, and the guide groove is gradually recessed from the periphery to the center of the stroke axis, and the port of the oil passage is located above the range of the guide groove.

[0016] Preferably, the base comprises a base flange and a mounting flange, the shell is fixed to one end of the base flange, and the mounting flange is fixed to the other end of the base flange; one end of the drive sleeve is exposed from the mounting flange.

[0017] Preferably, a main bearing and a spline bearing are fixed on the driving sleeve, and the main bearing is fixed on the base flange; a plurality of spline grooves are distributed circumferentially on the mounting flange, and the spline bearing is plug-fitted with the plurality of spline grooves.

[0018] Preferably, a three-claw joint is provided at one end of the drive sleeve exposed from the mounting flange.

[0019] Preferably, the window cover comprises a window outer cover and a transparent inner cover installed in the window outer cover, the window outer cover is fixed on the indicating seat, and two waist-shaped windows are formed on the window outer cover, and the two waist-shaped windows are arranged opposite to the scales on two sides of the scale.

[0020] The above technical solution has the following advantages or beneficial effects: the present invention provides an electric actuator indicating mechanism. Compared with the existing mechanical electric actuator indicator, on the one hand, by synchronously opening a lubrication channel on the internal transmission structure, the lubricating oil can be accurately delivered to the internal mechanical transmission part from the outside, which greatly improves the utilization rate and lubrication efficiency of the lubricating oil and reduces the waste of the lubricating oil; on the other hand, the scale structure adopts an externally adjustable design, which can quickly calibrate and adjust the indicating mechanism to ensure the indication accuracy, and also solves the trouble of disassembling and assembling the external shell in the traditional adjustment process, thereby improving the convenience of calibration and adjustment; the comprehensive performance of the indicator is improved through the design of efficient lubrication and convenient calibration, and indirectly guarantees the indication accuracy and service life of the indicator. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention and its features, configurations and advantages will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings. The same reference numerals indicate the same parts throughout the drawings, which are not drawn to scale, with emphasis on illustrating the subject matter of the present invention.

[0022] Figure 1 It is a three-dimensional structural schematic diagram of an electric actuator indicating mechanism provided by the present invention.

[0023] Figure 2 The present invention is a three-dimensional cross-sectional view of an electric actuator indicating mechanism provided by the present invention when a window cover is not assembled.

[0024] Figure 3 is a perspective view of the base flange.

[0025] Figure 4 is a three-dimensional view of the mounting flange.

[0026] Figure 5 It is a three-dimensional cross-sectional view of the shell.

[0027] Figure 6 It is a stereoscopic diagram of the assembly of the indicating seat and the adjustable scale.

[0028] Figure 7 It is a three-dimensional diagram of the indicator seat.

[0029] Figure 8 This is a diagram showing the relative positions of the adjustable scale and the window cover.

[0030] Fig. 9 It is a three-dimensional structural diagram of the drive sleeve.

[0031] Fig.10 It is a three-dimensional structural diagram of the guide frame and travel shaft assembly.

[0032] In the figure: 1, base; 11, base flange; 12, mounting flange; 121, spline groove; 2, housing; 21, step groove; 22, positioning pin; 23, guide tube; 3, indicator seat; 31, positioning hole; 32, oil seal hole; 33, avoidance groove; 34, guide hole; 35, oil seal bolt; 4, adjustable scale; 41, adjustable base; 411, connecting plate; 412, adjusting screw; 413, slider; 414, scale base; 42, scale Ruler; 5. Window cover; 51. Transparent inner cover; 52. Window outer cover; 521. Waist-shaped window; 6. Indicator assembly; 61. Drive sleeve; 611. Three-claw joint; 612. Main bearing; 613. Spline bearing; 614. Guide groove; 62. Stroke shaft; 621. Screw section; 622. Stage; 63. Guide frame; 631. Fixed base block; 6311. Oil passage; 632. Guide rod; 64. Bending pointer; 641. Pointer head. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 7 As shown, an electric actuator indicating mechanism is a mechanical indicator used to indicate the working state of the electric actuator. It is mainly installed on the valve controlled by the electric actuator, and can also be directly installed on the electric actuator. In this embodiment, it is specifically installed on the valve. The indicating mechanism includes a base 1, and the base 1 includes a base flange 11 and a mounting flange 12. A cylindrical shell 2 is fixedly installed on one end of the base flange 11 by bolts. The base flange 11 is located in the shell 2. The mounting flange 12 is fixed to the other end of the base flange 11 by screws. The mounting flange 12 is installed on the corresponding valve by bolts. A circular step groove 21 is provided on the outer end surface of the shell 2 opposite to the base flange 11; a disc-shaped indicating seat 3 is embedded in the step groove 21, and two positioning pins 22 are welded in the step groove 21. A positioning hole 31 for inserting the positioning pin 22 is provided on the indicating seat 3. The initial positioning between the indicating seat 3 and the shell 2 is provided by the plug-in cooperation between the two positioning pins 22 and the positioning hole 31.

[0036] like Figure 2 , Figure 6 , Figure 7 and Figure 8 As shown, the indicating seat 3 is equipped with an adjustable scale 4, which includes an adjustable base 41 and a scale 42; the indicating seat 3 is embedded in the step groove 21 and is provided with a relief groove 33 on its end surface, and a square guide hole 34 is provided through the relief groove 33; the adjustable base 41 includes a connecting plate 411 located in the relief groove 33, a slider 413 is fixed on the connecting plate 411 and is slidably installed in the guide hole 34, and a scale base 414 is fixed on one end of the slider 413 extending out of the guide hole 34, and the scale 42 is fixed on the scale base 414; the connecting plate 411 is also rotatably installed with an adjusting screw 412 threadedly connected to the indicating seat 3. Both sides of the scale 42 are marked with digital scales representing the valve opening.

[0037] like Figure 1 , Figure 6 and Figure 8As shown, in order to ensure the sealing and prevent dust and other impurities from entering the housing 2, a window cover 5 is also fixed on the indicating seat 3, and the adjustable scale 4 is located in the window cover 5; the window cover 5 includes a window outer cover 52 and a transparent inner cover 51 fixed in the window outer cover 52 by bolts, the transparent inner cover 51 is made of acrylic material, the window outer cover 52 is fixed to the indicating seat 3 by screws, and two waist-shaped windows 521 are opened on the window outer cover 52, and the two waist-shaped windows 521 are arranged opposite to the scales on the two sides of the scale 42, so that the two scale surfaces of the scale 42 can be observed conveniently through the two waist-shaped windows 521.

[0038] like Figure 2 , Figure 4 and Fig. 9 As shown, an indicating assembly 6 for indicating the scale value on the adjustable scale 4 is installed in the housing 2. The indicating assembly 6 includes a driving sleeve 61, on which a main bearing 612 and a spline bearing 613 are fixed, and the main bearing 612 is fixed to the base flange 11 by screws; a circular hole is opened on the mounting flange 12 so that the driving sleeve 61 is exposed, and a plurality of spline grooves 121 are distributed on the circumference of the circular hole, and the spline bearing 613 is plugged and matched with the plurality of spline grooves 121. A three-claw joint 611 is provided at one end of the driving sleeve 61 exposed from the mounting flange 12, and the valve stem shaft end of the valve is engaged with the three-claw joint 611; when the electric actuator drives the valve stem of the valve to rotate, the valve stem indirectly drives the driving sleeve 61 to rotate synchronously therewith. The driving sleeve 61 is connected by a double bearing assembly, which greatly improves the stability of the driving shaft rotating with the valve stem.

[0039] like Figure 2 and Fig.10 As shown, a travel shaft 62 is assembled on the driving sleeve 61, and a screw segment 621 is arranged on the travel shaft 62. An internal threaded hole is processed at the central axis of the driving sleeve 61, and the driving sleeve 61 is threadedly connected with the screw segment 621 through the internal threaded hole; a travel shaft 62 is threadedly installed at the central axis of the driving sleeve 61, and the travel shaft 62 passes through the outer shell 2 and extends into the window cover 5. A bent pointer 64 for indicating a scale is fixed by a screw on one end of the travel shaft 62 extending toward the window cover 5; two pointer heads 641 are arranged on the bent pointer 64, and the scale 42 is located between the two pointer heads 641.

[0040] like Figure 2 , Figure 5 and Fig.10As shown, a guide frame 63 is assembled on the stroke shaft 62, and a stage 622 is arranged on the stroke shaft 62. The guide frame 63 includes a fixed base block 631 which is fixed on the stage 622. Two guide rods 632 which are arranged parallel to the stroke shaft 62 are welded on the fixed base block 631, and the stroke shaft 62 is equidistantly distributed between the two guide rods 632; the guide rod 632 is a circular tube structure, and two curved oil passages 6311 are relatively opened in the fixed base block 631; the two oil passages 6311 are correspondingly connected to the two guide rods 632, and the ports of the oil passages 6311 are close to the stroke shaft 62; two conduits 23 which are slidably matched with the two guide rods 632 in a one-to-one correspondence are welded in the outer shell 2, and one end of the conduit 23 is connected at the end face of the outer shell 2. The indicator seat 3 is provided with two oil seal holes 32 corresponding to the ports of the two conduits 23. The oil seal bolts 35 are installed through the oil seal holes 32. The oil seal bolts 35 are threadedly connected in the conduits 23. The oil seal bolts 35 fix the indicator seat 3 on the housing 2. The oil seal holes 32, the passage of the conduits 23, the passage of the guide rod 632 and the oil passage 6311 together constitute a single lubrication passage. Here, the oil seal bolts 35 play a sealing role on the oil seal holes 32 on the one hand, and on the other hand, the oil seal bolts 35 also play a role in pressing and installing the indicator seat 3. In order to further guide the lubricating oil to accurately reach the mechanical transmission part, a guide groove 614 is provided on the end of the drive sleeve 61 close to the guide frame 63, which is gradually recessed from the periphery to the center of the stroke shaft 62, and the port of the oil passage 6311 is located above the range of the guide groove 614.

[0041] The electric actuator indicating mechanism provided by the present invention can be installed at the valve end, the driving sleeve 61 is clamped on the valve shaft of the valve through the three-claw joint 611, and the mounting flange 12 is locked on the outer end of the valve by bolts. When the electric actuator receives the electrical signal from the controller, the electric actuator responds and converts the electrical signal into mechanical motion, thereby driving the valve stem of the valve to rotate, and the valve stem indirectly drives the driving sleeve 61 to rotate synchronously therewith. Under the guidance of the guide frame 63 and the two conduits 23, the driving sleeve 61 drives the stroke shaft 62 to move axially along the conduit 23, so that the pointer head 641 indicates the corresponding scale of the scale 42, and the numbers on the scale 42 represent the opening of the valve at this time.

[0042] When lubrication is needed, one of the oil seal bolts 35 or both of the oil seal bolts 35 can be opened at will, and then lubricating oil can be injected into the oil seal hole 32. The lubricating oil flows along the lubrication channel and drips into the guide groove 614, and further flows to the connection between the drive sleeve 61 and the stroke shaft 62, so that the transmission part is fully lubricated. Compared with the traditional method of simply opening a lubrication hole on the outer shell 2, in the present invention, on the one hand, the cooperation between the guide frame 63 and the conduit 23 realizes the drive guide for the movement of the stroke shaft 62. On the other hand, on the basis of the mutual communication between the guide frame 63 and the conduit 23, by opening a lubrication channel, the lubricating oil can be accurately delivered from the outside to the internal mechanical transmission part, which greatly improves the utilization rate and lubrication efficiency of the lubricating oil and reduces the waste of the lubricating oil.

[0043] When the indicator needs to be calibrated, the adjusting screw 412 can be directly rotated externally, thereby driving the scale 42 to move axially along the stroke shaft 62 through the adjustable base 41 to complete quick calibration, thereby solving the trouble of disassembling and assembling the external shell and improving the convenience of calibration adjustment.

[0044] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0046] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can make many possible changes and modifications without departing from the technical solution of the present invention, or modify them into equivalent embodiments with equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. An electric actuator indicating mechanism, comprising a base (1) for fixed installation, a housing (2) being fixed on the base (1), characterized in that: An indicating seat (3) is fixed to the outer end of the housing (2), an adjustable scale (4) is mounted on the indicating seat (3), a window cover (5) is also fixed to the indicating seat (3), and the adjustable scale (4) is visually enclosed in the window cover (5); an indicating assembly (6) for indicating the scale value on the adjustable scale (4) is installed in the housing (2); The indicating assembly (6) comprises a driving sleeve (61) rotatably mounted in the base (1); a stroke shaft (62) is threadedly mounted on the central axis of the driving sleeve (61); the stroke shaft (62) passes through the housing (2) and extends into the window cover (5); a bent pointer (64) for indicating the scale value on the adjustable scale (4) is fixed on one end of the stroke shaft (62) extending into the window cover (5); a sliding bearing (64) is fixed on the stroke shaft (62) for slidingly engaging with the interior of the housing (2); A guide frame (63) is provided with the housing (2), a lubrication passage is provided between the guide frame (63) and the housing (2), an oil seal hole (32) is provided on the indicator seat (3) and is connected to the lubrication passage port, lubrication oil flows outward along the lubrication passage through the oil seal hole (32), an oil seal bolt (35) is installed through the oil seal hole (32), the oil seal bolt (35) is threadedly connected to the housing (2), and the oil seal bolt (35) fixes the indicator seat (3) to the housing (2); The adjustable scale (4) comprises an adjustable base (41) mounted on the indicating seat (3) and a scale (42) fixed on the adjustable base (41), wherein the adjustable base (41) drives the scale (42) to move and adjust in the axial direction of the stroke shaft (62); The guide frame (63) comprises a fixed base block (631) fixed on the stroke shaft (62); a guide rod (632) arranged parallel to the stroke shaft (62) is fixed on the fixed base block (631); the guide rod (632) is a round tube structure; an oil passage (6311) is arranged in the fixed base block (631) and is connected to the guide rod (632) and guides the stroke shaft (62) to approach; a guide tube (23) is arranged in the housing (2) and is slidably matched with the guide rod (632); one end of the guide tube (23) is connected at the end surface of the housing (2); the oil seal hole (32) is butt-jointed with the port of the guide tube (23), and the oil seal bolt (35) is threadedly connected in the guide tube (23).

2. An electric actuator indicating mechanism according to claim 1, characterized in that: The outer end surface of the housing (2) is provided with a step groove (21), the indicating seat (3) is embedded in the step groove (21), at least one positioning pin (22) is fixed in the step groove (21), and the indicating seat (3) is provided with a positioning hole (31) for inserting the positioning pin (22).

3. An electric actuator indicating mechanism according to claim 2, characterized in that: The end surface of the indicating seat (3) embedded in the step groove (21) is provided with a avoiding groove (33), and a square guide hole (34) is provided through the avoiding groove (33); the adjustable base (41) comprises a connecting plate (411) located in the avoiding groove (33), a slider (413) is fixed on the connecting plate (411) and is slidably installed in the guide hole (34), a scale base (414) is fixed on one end of the slider (413) extending out of the guide hole (34), and the scale (42) is fixed on the scale base (414); an adjusting screw (412) threadedly connected to the indicating seat (3) is also rotatably installed on the connecting plate (411).

4. The electric actuator indicating mechanism according to claim 1, characterized in that: The scale (42) is marked with scales on both sides; the bending pointer (64) is provided with two pointer heads (641), and the scale (42) is located between the two pointer heads (641).

5. The electric actuator indicating mechanism according to claim 1, characterized in that: A guide groove (614) is provided on one end of the driving sleeve (61) close to the guide frame (63), and the guide groove (614) is gradually recessed from the periphery toward the center of the stroke shaft (62), and the port of the oil passage (6311) is located above the range of the guide groove (614).

6. The electric actuator indicating mechanism according to claim 1, characterized in that: The base (1) comprises a base flange (11) and a mounting flange (12); the housing (2) is fixed to one end of the base flange (11), and the mounting flange (12) is fixed to the other end of the base flange (11); one end of the drive sleeve (61) is exposed from the mounting flange (12).

7. An electric actuator indicating mechanism according to claim 6, characterized in that: A main bearing (612) and a spline bearing (613) are fixed on the driving sleeve (61), and the main bearing (612) is fixed on the base flange (11); a plurality of spline grooves (121) are distributed circumferentially on the mounting flange (12), and the spline bearing (613) is plug-fitted into the plurality of spline grooves (121).

8. An electric actuator indicating mechanism according to claim 6, characterized in that: One end of the driving sleeve (61) exposed from the mounting flange (12) is provided with a three-claw joint (611).

9. The electric actuator indicating mechanism according to claim 1, characterized in that: The window cover (5) comprises a window outer cover (52) and a transparent inner cover (51) installed in the window outer cover (52). The window outer cover (52) is fixed on the indicating seat (3). Two waist-shaped windows (521) are formed on the window outer cover (52). The two waist-shaped windows (521) are arranged opposite to the scales on two sides of the scale (42).

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