Adjusting mechanism for position extension detection of underwater electric push rod

Abstract

The utility model discloses an adjusting mechanism for position extension detection of an underwater electric push rod, and belongs to the technical field of position detection. The adjusting mechanism comprises a front shell, a rear shell, a bearing shell, a push rod with a nut, a lead screw, a detection rod, a touch ring and a motor, and the detection rod is connected to the nut, penetrates through lateral through holes in the bearing shell and the rear shell and reaches an annular cavity of the motor. And the limit switch is arranged in the motor annular cavity. The detection rod moves back and forth along with the nut, touches the full-stretching and full-retracting limit switch, and sends out a position signal for controlling the motor to start and stop. The rear shell is perforated, the nut is extended to the rear motor annular cavity through the cylindrical slender detection rod, the space of the motor annular cavity is fully utilized, a limit switch is touched for position detection, telescopic control of the push rod is completed, external trepanning and sealing links can be reduced, and the device is suitable for being used in an underwater environment.

Description

Technical Field

[0001] The utility model relates to the technical field of position detection, in particular to an adjusting mechanism for detecting the position extension of an underwater electric push rod. Background Art

[0002] The principle of electric linear actuators is that the motor rotates, driving the lead screw to rotate and the nut to translate, thereby generating the piston rod (push rod) to extend and retract. Electric linear actuators used underwater generally need to be installed with sealing rings for dynamic and static sealing.

[0003] In order to stop the electric push rod at the two extreme positions of extension and retraction, a limit switch is generally set. The control principle is as follows: Figure 6 . Assume that when the nut is in the middle position, the retraction operation is performed, point A is connected to the positive pole of the power supply, through the normally closed point of the limit switch K1, the motor winding, the normally closed point of the limit switch K2, to point B, connected to the negative pole of the power supply, and the motor is driven to rotate. When the electric push rod retracts to the extreme position, after the K2 reed is touched, its normally closed point is disengaged. Due to the reverse cutoff characteristic of the diode D2, the motor is powered off and stops rotating. Exchange the A and B leads, that is, point B is connected to the positive pole of the power supply. Due to the forward conduction of the diode D2, it passes through the motor winding, the normally closed point of the limit switch K1, to point A, connected to the negative pole of the power supply, and the motor is driven to rotate in the opposite direction. When the electric push rod is extended to its position, after the K1 reed is touched, its normally closed point is disengaged. Due to the reverse cutoff characteristic of the diode D1, the motor is powered off and stops rotating. According to this process, the electric push rod can be controlled to move back and forth.

[0004] Currently, the conventional design of electric actuators used underwater places the limit switch on the housing wall near the nut. The nut moves back and forth to contact the limit switch. If the switch is placed in a slot in the housing, sealing is difficult or the housing may bulge, resulting in an unsmooth movement and hindering product miniaturization. If the limit switch is built into this location, the installation and adjustment process is difficult, resulting in poor reliability or even impracticality. Utility Model Content

[0005] In view of this, the utility model provides an adjustment mechanism for underwater electric push rod position extension detection. By designing a perforation on the rear outer shell, the nut position is extended to the rear motor annular cavity using a cylindrical slender detection rod, fully utilizing the motor annular cavity space, touching the limit switch for position detection, and completing the motor extension and retraction control. It can reduce external openings and sealing links, and is suitable for use in underwater environments.

[0006] An adjustment mechanism for underwater electric push rod position extension detection, comprising a front housing, a rear housing, a push rod with a nut, a lead screw, a cover plate, a detection rod, a touch ring, a motor and a telescopic limit switch assembly;

[0007] The front housing and the rear housing are fixedly installed together, the bearing housing is installed in the installation cavity of the front housing, the lead screw is supported by the bearing in the bearing housing and cooperates with the push rod with a nut, one end of the push rod with a nut extends out of the front housing, and the other end of the push rod with a nut is located inside the cavity of the front housing and has space for axial movement, and the motor is fixedly installed inside the rear housing;

[0008] The rear housing and the bearing housing are provided with through holes on the sides, and the rear housing is provided with a right-angled step mounting surface inside. One end of the detection rod is connected to the push rod with a nut, and the other end passes through the side holes of the rear housing and the bearing housing and extends into the annular cavity for installing the motor. A touch ring is installed on the end of the detection rod located in the annular cavity; the telescopic limit switch assembly is installed on the step mounting surface inside the rear housing and corresponds to the position of the detection rod. The motor drives the screw to rotate, and the push rod with the nut drives the detection rod to reciprocate synchronously. After the touch ring comes into contact with the telescopic limit switch assembly, it outputs a position control signal to the outside.

[0009] Furthermore, the telescopic limit switch assembly includes a fully extended limit switch assembly and a fully retracted limit switch assembly. The components of the fully extended limit switch assembly and the fully retracted limit switch assembly have the same structure and are installed symmetrically on the right-angle step mounting surface inside the rear shell. The touch ring is located between the fully extended limit switch assembly and the fully retracted limit switch assembly.

[0010] Furthermore, the full extension limit switch assembly includes an arc-shaped plate, a slotted L bracket, a pull plate, a connecting plate, an adjustment seat, a full extension switch and an extension adjustment screw;

[0011] The arc-shaped plate has an arc-shaped groove, the horizontal part of the slotted L bracket is used to connect the arc-shaped plate, and the outer surface of the vertical part is processed with an inwardly concave straight groove;

[0012] The adjustment seat is fixedly connected to the end opposite to the horizontal part of the slotted L bracket, the connecting plate is installed in the straight groove of the slotted L bracket and slides with it, the full extension switch is placed between the connecting plate and the pull plate, and the screws pass through the pull plate, the full extension switch and the connecting plate in sequence to connect the three together; one end of the extending adjusting screw is movably connected to the pull plate, and the other end is engaged with the threaded hole of the adjusting seat to expose the adjustment seat, and a straight groove is processed on the end surface of this end; the slotted L bracket is fixedly connected to the arc plate through the horizontal part, and the arc plate is then connected to the right-angle step mounting surface inside the rear shell after passing through the arc groove by screws. The full extension switch realizes coarse adjustment of the relative position of the full extension switch and the touch ring through the arc groove on the arc plate, and realizes fine adjustment of the relative position of the full extension switch and the touch ring by extending the adjusting screw.

[0013] Furthermore, the fully retracted limit switch assembly includes an arc-shaped plate, a slotted L-bracket, a pull plate, a connecting plate, an adjustment seat, a fully retracted switch, and a retraction adjustment screw;

[0014] The arc-shaped plate has an arc-shaped groove, the horizontal part of the slotted L bracket is used to connect the arc-shaped plate, and the outer surface of the vertical part is processed with an inwardly concave straight groove;

[0015] The adjustment seat is fixedly connected to the end opposite to the horizontal part of the slotted L bracket, the connecting plate is installed in the straight groove of the slotted L bracket and slides with it, the full-retraction switch is placed between the connecting plate and the pull plate, and the screws pass through the pull plate, the full-retraction switch and the connecting plate in sequence to connect the three together; one end of the retraction adjustment screw is movably connected to the pull plate, and the other end is engaged with the threaded hole of the adjustment seat to expose the adjustment seat, and a straight groove is processed on the end surface of this end; the slotted L bracket is fixedly connected to the arc plate through the horizontal part, and the arc plate is then connected to the right-angle step mounting surface inside the rear shell after passing through the arc groove by screws. The full-retraction switch realizes coarse adjustment of the relative position of the full-retraction switch and the touch ring through the arc groove on the arc plate, and realizes fine adjustment of the relative position of the full-retraction switch and the touch ring through the retraction adjustment screw.

[0016] Beneficial effects:

[0017] 1. The utility model arranges the position adjustment mechanism inside the open annular cavity of the rear housing. By perforating the rear housing, the nut position is extended to the rear motor annular cavity using a cylindrical slender detection rod, which can reduce external openings and sealing links, making it suitable for use in underwater environments; the position detection is extended to the open annular space of the motor cavity for adjustment, making full use of the annular space between the motor and the rear housing, with a compact and sophisticated structure and high integration. The adjustment mechanism is installed, positioned, and adjusted from the end face, which is very convenient. Compared with the limit switch arranged on the inner wall of the front housing near the nut, the external protrusion is reduced, which has a significant effect on reducing the volume, and is convenient for immediate adjustment when the transmission mechanism is assembled.

[0018] 2. The telescopic limit switch assembly of the present invention adopts a fully extended limit switch assembly and a fully retracted limit switch assembly. The fully extended limit switch assembly and the fully retracted limit switch assembly are assembled identically and symmetrically in direction, with only the length of the adjusting screw being different. The fully extended switch in the fully extended limit switch assembly realizes coarse adjustment of the relative position of the fully extended switch and the touch ring through the arc groove on the arc plate, and realizes fine adjustment of the relative position of the fully extended switch and the touch ring by extending the adjusting screw; the fully retracted switch in the fully retracted limit switch assembly realizes coarse adjustment of the relative position of the fully retracted switch and the touch ring through the arc groove on the arc plate, and realizes fine adjustment of the relative position of the fully retracted switch and the touch ring by retracting the adjusting screw; it realizes large-scale coarse adjustment of arc rotation and small-scale fine adjustment in the axial direction, each with its own division of labor and reasonable design. After coarse adjustment, it can be fixed and no longer adjusted, which can meet the basic requirements of adjustment.

[0019] 3. This utility model extends the electrical part to a remote location, making it easy to connect the wires in the motor's annular cavity and improving maintainability. During later maintenance, the rear cover can be opened at any time for fine adjustment, which improves the reliability of product adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the underwater electric push rod in the extended state;

[0021] Figure 2 This is a schematic diagram of the underwater electric push rod in the retracted state;

[0022] Figure 3 This is a three-dimensional diagram of the installation relationship of the adjustment mechanism of the utility model;

[0023] Figure 4 A three-dimensional diagram of the adjustment mechanism of the utility model;

[0024] Figure 5 It is a cross-sectional view of the adjustment mechanism of the utility model;

[0025] Figure 6 This is the schematic diagram of the electric push rod extension control.

[0026] Among them, 1-front housing; 2-rear housing; 3-bearing housing; 4-push rod with nut; 5-screw; 6-cover plate; 7-axial dynamic seal; 8-detection rod; 9-touch ring; 10-motor; 11-arc plate; 12-L bracket with slot; 13-pull plate; 14-connecting plate; 15-adjustment seat; 16-full extension switch; 17-full retraction switch; 18-extend adjustment screw; 19-retract adjustment screw. DETAILED DESCRIPTION

[0027] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0028] As attached Figure 1 and 2 As shown, the present invention provides an adjustment mechanism for detecting the position extension of an underwater electric push rod, comprising a front housing 1, a rear housing 2, a bearing housing 3, a push rod with a nut 4, a lead screw 5, a cover plate 6, an axial dynamic seal 7, a detection rod 8, a touch ring 9, a motor 10, and a telescopic limit switch assembly. The telescopic limit switch assembly includes a fully extended limit switch assembly and a fully retracted limit switch assembly. The fully extended limit switch assembly includes an arc plate 11, a slotted L-shaped bracket 12, a pull plate 13, a connecting plate 14, an adjustment seat 15, a fully extended switch 16, and an extension adjustment screw 18. The fully retracted limit switch assembly includes an arc plate, a slotted L-shaped bracket, a pull plate, a connecting plate, an adjustment seat, a fully retracted switch, and a retracted adjustment screw 19. The fully extended limit switch assembly and the fully retracted limit switch assembly are assembled identically, except for their symmetrical orientation and different adjustment screw lengths.

[0029] Install the axial dynamic seal 7 into the inner bore of the front housing 1. Then, assemble the screw-nut assembly consisting of the nut-mounted push rod 4 and the lead screw 5. Install the bearing housing 3 onto the lead screw 5, insert the bearing, and tighten the end nuts. First, screw the motor 10 to the rear housing 2 with screws. The motor shaft is keyed. An O-ring is inserted into the stopper of the rear housing 2 and screwed to the front housing 1. Simultaneously, the motor shaft is inserted into the lead screw 5. The right hole of the lead screw 5 is machined with a keyway, which connects to the key on the motor shaft to transmit power. This completes the assembly of the main transmission structure of the electric actuator.

[0030] The detection rod 8 passes through the side holes on the rear housing 2 and the bearing housing 3, and one end is fixed to the nut. The touch ring 9 is placed coaxially on the detection rod 8 and tightened with two nuts. The drive motor is energized. As the push rod 4 with the nut moves horizontally, the detection rod 8 also moves with the same stroke.

[0031] As attached Figure 3-5 As shown, in the fully extended and fully retracted limit switch assemblies, the curved plate 11 is screwed to the slotted L-bracket 12, forming a single unit. These two components are sheet metal, resulting in low processing costs. The connecting plate 14, the fully extended switch 16 or fully retracted switch 17, and the pull plate 13 are screwed together. The connecting plate 14 has threaded holes that are pre-placed into the slots of the L-bracket 12, allowing for easy sliding within the slots. The adjustment base 15 is screwed to the slotted L-bracket 12. One end of the extending or retracting adjustment screw 18 or 19 is flexibly connected to the pull plate 13, while the other end enters the threads of the adjustment base 15 for adjustment.

[0032] Place the fully extended limit switch assembly and the fully retracted limit switch assembly into the bottom of the annular cavity of the motor, slightly tighten the curved plate 11 with screws, and rotate it left and right until the limit switch contact position meets the basic requirements. Then, tighten the curved plate 11. At this time, use a flathead screwdriver to adjust the extension adjustment screw 18 or the retraction adjustment screw 19 to accurately adjust the contact position. After the entire position adjustment is completed, place an O-ring on the stopper of the cover plate 6 and tighten the screws to form a closed space. Figure 1 and 2 As shown, the through hole φD is used to fix the electric push rod to the equipment, and the thread MX on the push rod is used to connect the load.

[0033] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. An adjustment mechanism for underwater electric push rod position extension detection, characterized in that: It includes a front housing, a rear housing, a push rod with a nut, a lead screw, a cover plate, a detection rod, a touch ring, a motor and a telescopic limit switch assembly; The front housing and the rear housing are fixedly installed together, the bearing housing is installed in the installation cavity of the front housing, the lead screw is supported by the bearing in the bearing housing and cooperates with the push rod with a nut, one end of the push rod with a nut extends out of the front housing, and the other end of the push rod with a nut is located inside the cavity of the front housing and has space for axial movement, and the motor is fixedly installed inside the rear housing; The rear housing and the bearing housing are provided with through holes on the sides, and the rear housing is provided with a right-angled step mounting surface inside. One end of the detection rod is connected to the push rod with a nut, and the other end passes through the side holes of the rear housing and the bearing housing and extends into the annular cavity for installing the motor. A touch ring is installed on the end of the detection rod located in the annular cavity; the telescopic limit switch assembly is installed on the step mounting surface inside the rear housing and corresponds to the position of the detection rod. The motor drives the screw to rotate, and the push rod with the nut drives the detection rod to reciprocate synchronously. After the touch ring comes into contact with the telescopic limit switch assembly, it outputs a position control signal to the outside.

2. The adjustment mechanism for underwater electric push rod position extension detection according to claim 1, characterized in that: The telescopic limit switch assembly includes a fully extended limit switch assembly and a fully retracted limit switch assembly. The components of the fully extended limit switch assembly and the fully retracted limit switch assembly have the same structure and are installed symmetrically on the right-angle step mounting surface inside the rear shell. The touch ring is located between the fully extended limit switch assembly and the fully retracted limit switch assembly.

3. The adjustment mechanism for underwater electric push rod position extension detection according to claim 2, characterized in that: The full extension limit switch assembly includes an arc plate, a slotted L bracket, a pull plate, a connecting plate, an adjustment seat, a full extension switch and an extension adjustment screw; The arc-shaped plate has an arc-shaped groove, the horizontal part of the slotted L bracket is used to connect the arc-shaped plate, and the outer surface of the vertical part is processed with an inwardly concave straight groove; The adjustment seat is fixedly connected to the end opposite to the horizontal part of the slotted L bracket, the connecting plate is installed in the straight groove of the slotted L bracket and slides with it, the full extension switch is placed between the connecting plate and the pull plate, and the screws pass through the pull plate, the full extension switch and the connecting plate in sequence to connect the three together; one end of the extending adjusting screw is movably connected to the pull plate, and the other end is engaged with the threaded hole of the adjusting seat to expose the adjustment seat, and a straight groove is processed on the end surface of this end; the slotted L bracket is fixedly connected to the arc plate through the horizontal part, and the arc plate is then connected to the right-angle step mounting surface inside the rear shell after passing through the arc groove by screws. The full extension switch realizes coarse adjustment of the relative position of the full extension switch and the touch ring through the arc groove on the arc plate, and realizes fine adjustment of the relative position of the full extension switch and the touch ring by extending the adjusting screw.

4. The adjustment mechanism for underwater electric push rod position extension detection according to claim 3, characterized in that: The fully retracted limit switch assembly includes an arc-shaped plate, an L-shaped bracket with a slot, a pull plate, a connecting plate, an adjustment seat, a fully retracted switch and a retracted adjustment screw; The arc-shaped plate has an arc-shaped groove, the horizontal part of the slotted L bracket is used to connect the arc-shaped plate, and the outer surface of the vertical part is processed with an inwardly concave straight groove; The adjustment seat is fixedly connected to the end opposite to the horizontal part of the slotted L bracket, the connecting plate is installed in the straight groove of the slotted L bracket and slides with it, the full-retraction switch is placed between the connecting plate and the pull plate, and the screws pass through the pull plate, the full-retraction switch and the connecting plate in sequence to connect the three together; one end of the retraction adjustment screw is movably connected to the pull plate, and the other end is engaged with the threaded hole of the adjustment seat to expose the adjustment seat, and a straight groove is processed on the end surface of this end; the slotted L bracket is fixedly connected to the arc plate through the horizontal part, and the arc plate is then connected to the right-angle step mounting surface inside the rear shell after passing through the arc groove by screws. The full-retraction switch realizes coarse adjustment of the relative position of the full-retraction switch and the touch ring through the arc groove on the arc plate, and realizes fine adjustment of the relative position of the full-retraction switch and the touch ring through the retraction adjustment screw.

5. The adjustment mechanism for underwater electric push rod position extension detection according to claim 3 or 4, characterized in that: The arc-shaped plate and the L-shaped bracket with grooves are processed by sheet metal.

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