Photo-thermal push rod with self-rotating inner pipe and high repeated positioning precision

Abstract

The utility model relates to the technical field of push rods, and discloses a photo-thermal push rod with a self-rotating inner tube and high repeated positioning precision, which comprises an outer tube, an inner tube and a motor, an aluminum substrate electrically connected with the motor is arranged in the outer tube, and an upper inductive switch and a lower inductive switch are arranged on the aluminum substrate. The lower inductive switch and the upper inductive switch are respectively positioned at two ends of the aluminum substrate; the periphery of the inner pipe is sleeved with a magnet base, and a magnet is arranged in the magnet base. On the basis that the original limiting function of the photo-thermal push rod is reserved, the upper inductive switch and the lower inductive switch are integrated on the aluminum substrate, the upper inductive switch and the lower inductive switch share the same power supply circuit, multiple wires do not need to be led out from a single switch, and the control cost is saved; whether the push rod reaches upper and lower limit positions is identified; the positioning precision of the inductive switch can reach 0.1 mm. The stroke control precision and the repeated positioning precision are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of push rods, and more specifically, to a solar thermal push rod with a rotatable inner tube and high repeat positioning accuracy. Background Art

[0002] At present, the stroke switch limiting methods of solar thermal push rods on the market include inductive zero position switches and contact type upper and lower limit switches. The inductive zero position switch is not good for intuitively determining the upper limit position of the push rod, and the contact type upper and lower limit switches are affected by the process and have a large positioning error. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a solar thermal push rod with a rotatable inner tube and high repeat positioning accuracy, aiming to solve the problem of poor positioning accuracy of the limit switch of the stroke switch of the solar thermal push rod in the prior art.

[0004] The solar thermal push rod with a rotatable inner tube and high repeat positioning accuracy of the utility model includes an outer tube, an inner tube and a motor. The motor is installed at one end of the outer tube. One end of the inner tube is inserted into the outer tube, and the other end of the inner tube is exposed outside the outer tube. A screw rod for driving the inner tube to telescopically move in the outer tube is connected to the motor, and the screw rod is in threaded connection with the inner tube;

[0005] An aluminum substrate electrically connected to the motor is arranged in the outer tube. An upper induction switch for restricting the inner tube from moving to the upper limit position in the outer tube and a lower induction switch for restricting the inner tube from moving to the lower limit position in the outer tube are arranged on the aluminum substrate. The lower induction switch and the upper induction switch are respectively located at both ends of the aluminum substrate;

[0006] A magnet seat is sleeved on the outer periphery of the inner tube. A magnet for sensing and triggering the lower induction switch or the upper induction switch is arranged in the magnet seat, and the magnet seat is in sliding fit with the outer tube.

[0007] Furthermore, a wire groove hole for inserting the aluminum substrate is arranged in the outer tube. The wire groove hole runs through the outer tube from the top to the bottom, and the aluminum substrate extends along the length direction of the wire groove hole.

[0008] Furthermore, a wire groove retaining seat is connected to one end of the aluminum substrate, and the aluminum substrate is positioned and installed on the outer tube through the wire groove retaining seat.

[0009] Furthermore, the magnet and the aluminum substrate are arranged at intervals relative to each other.

[0010] Furthermore, the inner tube and the screw rod are in threaded connection through a nut sleeve. The magnet seat is sleeved outside the nut sleeve, and the magnet seat is in spaced fit with the nut sleeve.

[0011] Furthermore, a plurality of sliding protrusions are provided on the outer circumference of the magnet seat, and the plurality of sliding protrusions are arranged circumferentially and spaced apart along the outer circumference of the magnet seat. The magnet seat slides with the outer tube through the sliding protrusions, and the lengths of the plurality of sliding protrusions away from the magnet seat are different.

[0012] Furthermore, the outer tube has an internal cavity that runs through from top to bottom, and the inner side of the internal cavity has a plurality of inwardly recessed slide grooves, the plurality of slide grooves are arranged circumferentially and spaced apart along the inner side of the internal cavity, the slide protrusion is located in the slide groove, and the magnet seat slides in cooperation with the slide groove of the outer tube through the slide protrusion.

[0013] Furthermore, the inner cavity and the wire slot hole are arranged relatively spaced apart.

[0014] Furthermore, the motor is connected to the screw through a coupling and fixed to the motor seat with screws. The motor and the outer tube are movably connected through the motor seat. The screw is threadedly connected to the spline nut. A stop washer is sleeved on the screw. The stop washer is spline-connected to the spline nut. A retaining ring is connected to the screw for limiting the stop washer on the spline nut.

[0015] Furthermore, an inner ring is formed on the inner side of the stop washer, and the inner ring is connected to the screw rod by a multi-tooth spline. An outer ring is formed on the outer side of the stop washer, and the outer ring is connected to the spline nut by a multi-tooth spline.

[0016] Compared with the prior art, the utility model provides a photothermal push rod with an inner tube that can rotate and repeat positioning with high accuracy. On the basis of retaining the original limit function of the photothermal push rod, the upper sensing switch and the lower sensing switch are integrated on the aluminum substrate. The upper sensing switch and the lower sensing switch share the same power supply circuit, and there is no need for a single switch to lead out multiple wires, which saves control costs. The inner tube triggers the upper sensing switch or the lower sensing switch by driving the magnet of the magnet seat. When the magnet approaches the upper and lower sensing switches, the high and low levels of the switch are converted to identify whether the push rod has reached the upper and lower limit positions. The positioning accuracy of the sensing switch can reach 0.1mm. Compared with the common contact switch and inductive zero position switch arrangements, the stroke control accuracy and repeat positioning accuracy of this scheme are greatly improved. The problem of poor limit switch positioning accuracy of the stroke switch of the photothermal push rod is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of a photothermal push rod with an inner tube capable of self-rotation and high repeatable positioning accuracy provided by the utility model;

[0018] Figure 2 It is a schematic diagram of the cross-section structure of the photothermal push rod provided by the utility model, the inner tube of which can rotate and repeat positioning with high precision;

[0019] Figure 3 is an exploded three-dimensional schematic diagram of a solar thermal push rod with a highly accurate repeatable positioning and rotatable inner tube provided by the present utility model;

[0020] Figure 4 is a three-dimensional schematic diagram of a stop washer provided by the present utility model;

[0021] Figure 5 is a three-dimensional schematic diagram of a magnet seat provided by the present utility model.

[0022] In the figure: outer tube 10, inner tube 20, motor 30, screw 40, aluminum substrate 50, nut sleeve 60, coupling 70, motor seat 80, wire groove hole 11, internal cavity 12, sliding groove 13, magnet seat 21, sliding convex 22, magnet 23, spline nut 41, stop washer 42, retaining ring 43, inner ring 44, outer ring 45, wire groove retaining seat 51. Detailed implementation manners

[0023] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0024] The implementation of the present utility model will be described in detail below with reference to specific embodiments.

[0025] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and cannot be understood as a limitation of the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] Refer to Figures 1-5 as shown, which is a preferred embodiment provided by the present utility model.

[0027] A solar thermal push rod with a highly accurate repeatable positioning and rotatable inner tube 20 includes an outer tube 10, an inner tube 20 and a motor 30. The motor 30 is installed at one end of the outer tube 10. One end of the inner tube 20 is inserted into the outer tube 10, and the other end of the inner tube 20 is exposed outside the outer tube 10. A screw 40 for driving the inner tube 20 to telescopically move in the outer tube 10 is connected to the motor 30, and the screw 40 is threadedly connected to the inner tube 20;

[0028] An aluminum substrate 50 electrically connected to the motor 30 is provided in the outer tube 10. An upper induction switch for restricting the inner tube 20 from moving to the upper limit position within the outer tube 10 and a lower induction switch for restricting the inner tube 20 from moving to the lower limit position within the outer tube 10 are provided on the aluminum substrate 50. The lower induction switch and the upper induction switch are respectively located at both ends of the aluminum substrate 50;

[0029] A magnet seat 21 is sleeved on the outer periphery of the inner tube 20. A magnet 23 for sensing and triggering the lower induction switch or the upper induction switch is provided in the magnet seat 21. The magnet seat 21 is slidably matched with the outer tube 10.

[0030] For the above-provided optical thermal push rod with high repeat positioning accuracy for the inner tube 20 to rotate, on the basis of retaining the original limit function of the optical thermal push rod, the upper induction switch and the lower induction switch are integrated on the aluminum substrate 50. The upper induction switch and the lower induction switch share the same power supply circuit, eliminating the need to lead out multiple wires for each individual switch, saving control costs. The inner tube 20 drives the magnet 23 of the magnet seat 21 to trigger the upper induction switch or the lower induction switch. When the magnet 23 approaches the upper and lower induction switches, by converting the high and low levels of the switch, it can identify whether the push rod reaches the upper and lower limit positions; the positioning accuracy of the induction switch can reach 0.1 mm. Compared with the common arrangement methods of contact switches and inductive zero position switches, the stroke control accuracy and repeat positioning accuracy of this solution are both greatly improved; it solves the problem of poor positioning accuracy of the limit switch for the stroke switch of the optical thermal push rod.

[0031] In this embodiment, a wire groove hole 11 for inserting the aluminum substrate 50 is provided in the outer tube 10. The wire groove hole 11 is arranged to penetrate along the direction from the top to the bottom of the outer tube 10. The aluminum substrate 50 is arranged to extend along the length direction of the wire groove hole 11. In this way, the outer tube 10 can position and install the aluminum substrate 50 through the wire groove hole 11, preventing the displacement of the aluminum substrate 50.

[0032] In this embodiment, a wire groove retaining seat 51 is connected to one end of the aluminum substrate 50. The aluminum substrate 50 is positioned and installed on the outer tube 10 through the wire groove retaining seat 51. In this way, the stability of the installation of the aluminum substrate 50 can be increased through the wire groove retaining seat 51, and the displacement of the aluminum substrate 50 can be prevented.

[0033] In this embodiment, the magnet 23 and the aluminum substrate 50 are arranged at a relative interval. In this way, the magnet 23 can be prevented from colliding with the aluminum substrate 50.

[0034] In this embodiment, the inner tube 20 and the screw 40 are threadedly connected through a nut sleeve 60. The magnet seat 21 is sleeved outside the nut sleeve 60, and the magnet seat 21 is spaced and matched with the nut sleeve 60.

[0035] Driven by the screw 40, the nut sleeve 60 makes a reciprocating linear motion within the outer tube 10. Since there is no positioning groove in the outer tube 10 to restrict the rotation of the nut sleeve 60, the nut sleeve 60 will also perform a circular motion while making a reciprocating linear motion, thereby causing the inner tube 20 of the push rod to rotate. This can protect the internal structure from being damaged during a collision.

[0036] In this embodiment, a plurality of sliding protrusions 22 protrude outward from the outer periphery of the magnet seat 21. The plurality of sliding protrusions 22 are circumferentially spaced and arranged along the outer periphery of the magnet seat 21. The magnet seat 21 is slidably engaged with the outer tube 10 through the sliding protrusions 22, and the lengths of the plurality of sliding protrusions 22 away from the magnet seat 21 are different.

[0037] The outer tube 10 has an internal cavity 12 that penetrates vertically. A plurality of chutes 13 are formed by inward depressions on the inner side of the internal cavity 12. The plurality of chutes 13 are circumferentially spaced and arranged along the inner side of the internal cavity 12. The sliding protrusions 22 are located in the chutes 13, and the magnet seat 21 is slidably engaged with the chutes 13 of the outer tube 10 through the sliding protrusions 22.

[0038] Since the magnet seat 21 is fixed on the nut sleeve 60, the magnet seat 21 will perform a reciprocating linear motion and a circular motion along with the nut sleeve 60. When the magnet seat 21 performs a circular motion, the magnet 23 on it cannot accurately sense the switch position. Therefore, chutes 13 are provided in the outer tube 10 to restrict the rotation of the magnet seat 21. Since the magnet seat 21 and the nut sleeve 60 are in clearance fit, this restriction will not affect the rotation of the nut sleeve 60. Therefore, the magnet seat 21 only performs a reciprocating linear motion during the transmission process.

[0039] In this embodiment, the internal cavity 12 and the wire groove hole 11 are arranged at a relative interval. In this way, it can prevent the aluminum substrate 50 from being damaged during a collision.

[0040] In this embodiment, the motor 30 and the screw 40 are connected by a coupling 70 and fixed to the motor seat 80 with screws. The motor 30 is movably connected to the outer tube 10 through the motor seat 80. The screw 40 is threadedly connected to the spline nut 41. A stop washer 42 is sleeved on the screw 40. The stop washer 42 is spline-connected to the spline nut 41. A retaining ring 43 is connected to the screw 40 for limiting the stop washer 42 on the spline nut 41.

[0041] When the motor 30 works, the output shaft of the motor 30 is connected to the screw 40 through the coupling 70 and rotates synchronously. The circular motion is converted into a linear motion of the push rod through the transmission of the screw 40, thereby realizing the pushing and pulling function; when the inner tube 20 bears a static tensile force in the direction of the motor 30, the tensile force is transmitted to the screw 40 through the nut sleeve 60 and then to the spline nut 41. At this time, the spline nut 41 bears a static tensile force in the direction of the motor 30;

[0042] When the motor 30 suddenly starts, at the moment of rotation, the screw 40 is in a moving state and the spline nut 41 is in a static state. If the rotation direction of the screw 40 is opposite to the fastening direction of the spline nut 41, the spline nut 41 will gradually become loose. To prevent loosening, a stop washer 42 is added between the spline nut 41 and the screw 40. The inner ring 44 of the stop washer 42 is fixed to the screw 40, and the outer ring 45 of the stop washer 42 is fixed to the tooth groove of the spline nut 41. Due to the randomness of the threaded connection, during assembly, the spline nut 41 must be rotated a certain angle in the loosening direction to enable the smooth assembly of the stop washer 42.

[0043] Since the loosening of the spline nut 41 will cause an axial clearance in the push rod, both the inner ring 44 and the outer ring 45 of the stop washer 42 are connected by multi-tooth splines. Compared with the common stop washer 42 with a double-flat inner ring 44 and a petal-shaped outer ring 45 on the market, this solution greatly reduces the adjustment angle of the spline nut 41, reduces the axial clearance of the push rod, and improves the return accuracy of the push rod when switching the push-pull force direction.

[0044] In this embodiment, an inner ring 44 is formed on the inner side of the stop washer 42, and the inner ring 44 and the screw 40 are connected by multi-tooth splines. An outer ring 45 is formed on the outer side of the stop washer 42, and the outer ring 45 and the spline nut 41 are connected by multi-tooth splines.

[0045] On the basis of retaining the original anti-loosening structure of the push rod, a multi-tooth internal meshing spline connection is adopted between the spline nut 41 and the stop washer 42, reducing the retraction angle of the spline nut 41, reducing the clearance between the spline nut 41 and the force-bearing plate, and reducing the return error of the push rod.

[0046] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. The inner tube can rotate and repeat the positioning with high precision. The characteristics are: It comprises an outer tube, an inner tube and a motor, wherein the motor is mounted on one end of the outer tube, one end of the inner tube is inserted into the outer tube, and the other end of the inner tube is exposed outside the outer tube, and the motor is connected with a screw rod for driving the inner tube to telescope in the outer tube, and the screw rod is threadedly connected with the inner tube; An aluminum substrate electrically connected to the motor is arranged in the outer tube, an upper induction switch for limiting the inner tube from moving to an upper limit position in the outer tube and a lower induction switch for limiting the inner tube from moving to a lower limit position in the outer tube are arranged on the aluminum substrate, and the lower induction switch and the upper induction switch are respectively located at two ends of the aluminum substrate; A magnet seat is sleeved on the outer circumference of the inner tube, a magnet for sensing and triggering the lower sensing switch or the upper sensing switch is arranged in the magnet seat, and the magnet seat is slidably matched with the outer tube.

2. The photothermal push rod with a self-rotatable inner tube and high repeatable positioning accuracy as claimed in claim 1, characterized in that: The outer tube is provided with a wire slot hole for inserting the aluminum substrate, the wire slot hole is arranged from the top of the outer tube to the bottom of the outer tube, and the aluminum substrate is extended along the length direction of the wire slot hole.

3. The photothermal push rod with a self-rotatable inner tube and high repeatable positioning accuracy as claimed in claim 2, characterized in that: A wire slot stopper is connected to one end of the aluminum substrate, and the aluminum substrate is positioned and installed on the outer tube through the wire slot stopper.

4. The photothermal push rod with a self-rotatable inner tube and high repeatable positioning accuracy as claimed in claim 3 is characterized in that: The magnet and the aluminum substrate are arranged relatively spaced apart.

5. The photothermal push rod with a self-rotatable inner tube and high repeatable positioning accuracy as claimed in claim 4 is characterized in that: The inner tube is threadedly connected to the screw rod via a nut sleeve, the magnet seat is sleeved outside the nut sleeve, and the magnet seat and the nut sleeve are spaced and matched.

6. The photothermal push rod with a self-rotatable inner tube and high repeatable positioning accuracy as claimed in claim 5, characterized in that: The outer circumference of the magnet seat is provided with a plurality of sliding protrusions protruding outwards, and the plurality of sliding protrusions are arranged circumferentially and spaced apart along the outer circumference of the magnet seat. The magnet seat is slidably fitted with the outer tube through the sliding protrusions, and the lengths of the plurality of sliding protrusions away from the magnet seat are different.

7. The photothermal push rod with a self-rotatable inner tube and high repeatable positioning accuracy as claimed in claim 6, characterized in that: The outer tube has an internal cavity that runs through from top to bottom, and the inner side of the internal cavity has a plurality of inwardly recessed slide grooves, the plurality of slide grooves are arranged circumferentially and spaced apart along the inner side of the internal cavity, the slide protrusion is located in the slide groove, and the magnet seat slides in cooperation with the slide groove of the outer tube through the slide protrusion.

8. The photothermal push rod with a self-rotatable inner tube and high repeatable positioning accuracy as claimed in claim 7, characterized in that: The inner cavity and the wire slot hole are arranged relatively spaced apart.

9. The photothermal push rod with an inner tube capable of self-rotation and high repeatable positioning accuracy as claimed in any one of claims 1 to 8, characterized in that: The motor is connected to the screw rod through a coupling and fixed to the motor seat with screws. The motor and the outer tube are movably connected through the motor seat. The screw rod is threadedly connected to the spline nut. A stop washer is sleeved on the screw rod. The stop washer is spline-connected to the spline nut. A retaining ring is connected to the screw rod for limiting the stop washer on the spline nut.

10. The photothermal push rod with a self-rotatable inner tube and high repeatable positioning accuracy as claimed in claim 9, characterized in that: An inner ring is formed on the inner side of the stop washer, and the inner ring is connected to the screw rod by a multi-tooth spline. An outer ring is formed on the outer side of the stop washer, and the outer ring is connected to the spline nut by a multi-tooth spline.

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