CN218213574U - Optical fiber light transmission beam for industrial robot - Google Patents

Abstract

The utility model relates to an optic fibre passes light beam technical field, specifically provides an industrial robot passes light beam with optic fibre, including leaded light optic fibre, leaded light optic fibre includes the optic fibre bundle, the outer wall cladding of optic fibre bundle has the protective layer, the oversheath is located the outside of leaded light optic fibre, set up a plurality of deformation recesses that the equidistance distributes on the oversheath along its length direction, wherein, deformation recess sets up in the unilateral of oversheath, has spacing rib between two adjacent deformation recesses, when two adjacent the lateral wall of spacing rib is laminated mutually, the oversheath is buckled to minimum bend radius, in order to restrict the bend radius of leaded light optic fibre; the outer sheath is provided with a deformation groove corresponding to the frequently bent part of the light guide optical fiber, so that the thickness of the outer sheath in the bending direction is reduced, and the bending performance of the frequently bent part of the light transmission beam is improved under the condition that the thickness of other areas of the outer sheath is not changed, so that the outer sheath is easier to bend.

Description

Optical fiber light transmission beam for industrial robot

Technical Field

The utility model relates to an optic fibre passes light beam technical field, particularly relates to an industrial robot passes light beam with optic fibre.

Background

The modern industrial process requires that a mechanical arm and a robot, particularly a joint service robot with multiple degrees of freedom, have stronger and stronger adaptability and flexibility, can freely move and position within the space range of multiple angles and postures, and realize the detection, control and execution control of complex application scenes. For example, the optical fiber sensor is integrated and applied to the fields of loading and unloading, counting, surface detection and the like of a robot, so that the execution process of the joint robot is more accurate, flexible and efficient, and the optical fiber sensor is applied to multiple industrial scenes.

At present, taking a service robot for counting and field detection as an example, an optical fiber light transmitting beam is integrally installed in an end effector of a machine or a mechanical arm to realize light transmission and detection between a light source and a coupler, and when the service robot detects a scanned object, a joint frequently moves, so that the optical fiber light transmitting beam frequently reciprocates to the same direction, the service life of the light transmitting beam is influenced, and the working efficiency is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to prior art's defect, provide an optical fiber passes light beam for industrial robot, be suitable for the end effector of integrated in the arm in, it includes:

the light guide optical fiber comprises an optical fiber bundle, and the outer wall of the optical fiber bundle is coated with a protective layer;

the outer sheath is sleeved outside the light guide optical fiber;

the outer sheath is provided with a plurality of deformation grooves which are distributed at equal intervals along the length direction;

the deformation grooves are formed in one side edge of the outer sheath, the adjacent two deformation grooves are provided with limiting ribs, when the adjacent two deformation grooves are attached to the side walls of the limiting ribs, the outer sheath is bent to the minimum bending radius to limit the bending radius of the light guide optical fiber.

Further, the minimum bend radius of the outer sheath is larger than the minimum bend radius of the light guide fiber.

Further, the distance between every two adjacent deformation grooves is 0.5-1.5 times of the thickness of the outer sheath.

Further, the cross-sectional shape of the deformed groove is set to be square.

Further, the cross-sectional shape of the deformation groove is set to be an isosceles trapezoid.

Furthermore, a plurality of preformed holes which are symmetrically distributed along the central axis are formed in the inner side of the outer sheath, and reinforcing cores are arranged on the inner sides of the preformed holes.

Furthermore, the external diameter of the reinforced core is smaller than the internal diameter of the prepared hole, so that the reinforced core can axially slide in the prepared hole after being penetrated into the prepared hole.

Furthermore, the inner diameter of the outer sheath is larger than the outer diameter of the light guide optical fiber, so that the outer sheath is sleeved outside the light guide optical fiber and a sliding gap is formed between the outer sheath and the light guide optical fiber.

Further, the reinforcing core includes a plurality of stranded fiber ropes twisted to have a circular cross-section.

Further, the outer jacket comprises a thermoplastic polyurethane elastic layer.

Compared with the prior art, the utility model discloses a robot optic fibre passes showing of light beam advantage to lie in:

the outer sheath is provided with a deformation groove corresponding to the frequently bent part of the light guide optical fiber, so that the thickness of the outer sheath in the bending direction is reduced, and the bending performance of the frequently bent part of the light transmission beam is improved under the condition that the thickness of other areas of the outer sheath is not changed, so that the light transmission beam is easier to bend;

be equipped with spacing rib between the adjacent deformation recess, pass the light beam when buckling (crooked), spacing rib through mutual butt limits the bend radius of outer sheath, because of the spacing rib of mutual butt can restrict the minimum bend radius of oversheath specific area, consequently, when its minimum bend radius is greater than the minimum bend radius of inside biography light beam, the oversheath receives spacing rib's restriction under the bending condition, alright form the protection under the bending condition to the fiber bundle of inside, avoid the crooked rupture of fiber bundle.

Drawings

The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For the sake of clarity, in each of the figures, not every component is labeled. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:

fig. 1 is a schematic cross-sectional view of an optical fiber beam for an industrial robot according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of an optical fiber beam according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of a bent optical fiber beam according to an embodiment of the present invention;

fig. 4 is a schematic cross-sectional view of a minimum bending radius of an optical fiber beam according to an embodiment of the present invention;

fig. 5 is a schematic partial axial view of an outer sheath according to an embodiment of the present invention;

fig. 6 is a schematic cross-sectional view of an embodiment of a first positioning groove in an optical fiber beam according to an embodiment of the present invention;

fig. 7 is a schematic cross-sectional view of an embodiment of a second positioning groove in an optical fiber beam according to an embodiment of the present invention.

The meaning of the individual reference symbols in the figures is as follows:

10. a light guide optical fiber; 11. a fiber optic bundle; 12. a protective layer; 20. an outer sheath; 201. a deformation groove; 202. reserving a hole; 21. limiting ribs; 30. a reinforcing core; 110. and (4) slipping clearance.

Detailed Description

For a better understanding of the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.

Referring to fig. 1 to 7, an optical fiber beam for an industrial robot includes a light guide fiber 10, an outer sheath 20, and a reinforcing core 30.

Wherein, light guide fiber 10 mainly used conduction light can, and the equal fixedly connected with leaded light beam joint in both ends of light guide fiber 10 connects at the both ends of light guide fiber 10, and leaded light beam joint cup joints, and one end is used for the light output to connect, and the other end is used for the light input to connect.

Further, the light guide fiber 10 includes a fiber bundle 11, the fiber bundle 11 includes a plurality of fiber units, an outer wall of the fiber bundle 11 is coated with a protective layer 12, and the protective layer 12 may be made of PE and is coated on the outer wall of the fiber bundle 11 for protecting the plurality of fiber units.

In an alternative embodiment, the optical fiber unit may be any one of a quartz optical fiber, a glass optical fiber or a plastic optical fiber, and the light guide bundle connector is a general quick-plug connector.

Further, the outer sheath 20 is sleeved outside the light guide fiber 10 and is used for protecting the light guide fiber 10.

Specifically, the outer sheath 20 is made of a thermoplastic polyurethane elastomer, and is extruded and molded by an extrusion tube extruder, as shown in fig. 1 and 2, the inner diameter of the extruded outer sheath 20 is larger than the outer diameter of the light guide fiber 10, so that a sliding gap 110 is formed between the outer sheath 20 and the light guide fiber 10.

The axial sliding space of the light guide fiber 10 in the outer sheath 20 is provided by the sliding gap 110, so that when the optical fiber bundle is bent, the light guide fiber 10 and the outer sheath 20 can slide mutually, the pressure and the tension when the optical fiber bundle is bent are decomposed, the bending resistance of the light guide bundle is improved, and the phenomena of bulging, breaking, wire breaking and the like caused by frequent and repeated bending of the common light guide bundle in use are prevented.

Further, in order to enhance the sliding property between the light guide fiber 10 and the outer sheath 20, the talc powder layer is formed by coating talc powder on the outer wall of the light guide fiber 10 (protective layer 12), so that the bending sliding property of the light guide fiber 10 in the outer sheath 20 can be further improved, the mutual friction force generated between the light guide fiber 10 and the outer sheath 20 during bending can be reduced, and the abrasion generated during frequent bending can be reduced.

Because the optical fiber is integrally installed in the mechanical arm or the mechanical finger, the optical fiber light guide beam in the mechanical arm or the mechanical finger is locally bent frequently along with the bending action of the mechanical arm or the mechanical finger, the thickness of the whole existing outer sheath 20 is the same, and the optical fiber light guide beam is bent in one direction in a frequent reciprocating mode at one part, so that the part where the optical fiber light guide beam is bent frequently is abraded, cracked or bent and broken.

As shown in fig. 2-5, a plurality of deformation grooves 201 are formed in the outer sheath 20 along the length direction thereof, the deformation grooves 201 are formed in a single side of the outer sheath 20, and are correspondingly formed in a portion where optical fiber beams need to be frequently bent, and are close to one side in the bending direction; the thickness of the bent portion of the outer sheath 20 is reduced by forming the deformation groove 201.

Because the thicker the thickness, the worse the bending performance is, and the stronger the extrusion acting force generated to the internal light guide fiber 10 during bending, the thickness of the bent part of the outer sheath 20 is reduced, so that the bent part is softer and easy to bend, thereby the frequently bent part after the light guide beam is formed is softer and easier to bend in the direction of the deformation groove 201, and the bending performance of the frequently bent part of the light guide beam is improved under the condition of not changing the thickness of other areas of the outer sheath.

Further, in order to limit the bending radius of the outer sheath 20, a limiting rib 21 is arranged between two adjacent deformation grooves 201.

As shown in fig. 4, when the side walls of the two position-limiting ribs 21 are attached to each other, the outer sheath 20 is bent to a minimum bending radius to limit the bending radius of the outer sheath 20.

Specifically, the minimum bending radius of the outer sheath 20 is larger than the minimum bending radius of the light guiding fiber 10; thus, when the outer sheath 20 is bent to the minimum bending radius, the outer sheath 20 is limited by the limiting rib 21 in the bent state, so that the light guide optical fiber 10 can be protected in the bent state, and the light guide optical fiber 10 is prevented from being bent and broken.

Optionally, the distance between two adjacent deformation grooves 201 is 0.5 to 1.5 times the thickness of the outer sheath 20; for limiting the bend radius of the outer sheath 20.

As shown in fig. 2, the cross-sectional shape of the deformed groove 201 is set to be square; as shown in the figure, the section of the limiting rib 21 between two adjacent deformation grooves 201 is also formed to be square; as shown in fig. 6 and 7, the shape of the cross section of each of the deformation grooves 201 is an isosceles trapezoid, which has a wide top and a narrow bottom as shown in fig. 7, and the cross section of each of the limiting ribs 21 between two adjacent deformation grooves 201 is an isosceles trapezoid, which has a narrow top and a narrow bottom as shown in fig. 7, and the cross section of each of the limiting ribs 21 between two adjacent deformation grooves 201 is an isosceles trapezoid, which has a wide top and a narrow bottom as shown in fig. 7.

With reference to the embodiments shown in fig. 2, fig. 6 and fig. 7, by forming the deformed grooves 201 with different cross-sectional shapes, the cross sections of the position-limiting ribs 21 between two adjacent deformed grooves 201 are also changed relatively, and the smaller the distance between two adjacent position-limiting ribs 21 is, the larger the bending radius of the molded outer sheath 20 is. Therefore, by changing the shape structure and pitch of the deformed groove 201, the local flexibility and local bending radius of the light guide beam after molding can be changed.

The cross-sectional shape of the deformed groove 201 is not limited to the square shape and the isosceles trapezoid shape as shown in the above embodiments and the drawings, and may be a circular shape, an arc shape, a semicircular shape, a polygonal shape, or a special-shaped structure.

Further, the thickness of the frequently bent part of the outer sheath 20 is reduced, and the strength of the frequently bent part of the outer sheath 20 is relatively reduced, so that the frequently bent part of the outer sheath 20 still has good strength after the deformation groove 201 is formed, and the bending resistance of the frequently bent part is improved, a plurality of preformed holes 202 are formed in the inner side of the outer sheath 20, the preformed holes 202 are symmetrically distributed around the central axis, and the reinforcing cores 30 are arranged on the inner sides of the preformed holes 202.

Specifically, the reinforcing core 30 includes a plurality of stranded fiber ropes twisted to have a circular cross-section; wear to establish to the inboard of oversheath 20 to distribute in the inboard a week of oversheath 20, the fiber rope light in weight, intensity are big, anti rotten, corrosion-resistant, have good pliability and elasticity, add to the inside of oversheath 20, when strengthening the bending resistance after the shaping of leaded light bundle, still improved the tensile strength of leaded light bundle.

Specifically, the outer sheath 20 is prepared as follows:

step 1, prefabricating a central mold tube with the outer diameter larger than that of a light guide optical fiber 10 and a plurality of reinforced core mold tubes with the outer diameters larger than that of a reinforced core 30, wherein the plurality of reinforced core mold tubes are centrally and symmetrically distributed on the peripheral side of the central mold tube and are preset on an extruder die head;

step 2, coating release agents on the outer walls of the reinforced core mold pipe and the central mold pipe;

and 3, extruding the thermoplastic polyurethane elastomer material on the outer wall of the central mold tube by using an extruding tube type extruder, enclosing and extruding a plurality of reinforcing core mold tubes to form the cross-sectional shape of the outer sheath 20 as shown in the figure, and demolding and removing the reinforcing core mold tubes and the central mold tube after the thermoplastic polyurethane elastomer material is cured so as to form a central hole for penetrating the light guide optical fiber 10 and a reserved hole 202 of the reinforcing core 30 on the outer sheath 20.

Specifically, the inner diameter of the prepared hole 202 on the outer sheath 20 prepared by the above steps is larger than the outer diameter of the reinforcing core 30, so that the reinforcing core 30 can axially slide in the prepared hole 202 after being penetrated into the prepared hole 202; thus, when the light guide bundle is bent, the reinforcing core 30 can slide with the outer sheath 20 in the outer sheath 20, thereby reducing the bending resistance and the friction.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The present invention is intended to cover by those skilled in the art various modifications and adaptations of the invention without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention is subject to the claims.

Claims (10)

1. An optical fiber beam for an industrial robot, comprising:

the light guide fiber (10), the light guide fiber (10) comprises a fiber bundle (11), and the outer wall of the fiber bundle (11) is coated with a protective layer (12);

the outer sheath (20) is sleeved outside the light guide optical fiber (10);

more than one deformation groove (201) is formed in the outer sheath (20) along the length direction of the outer sheath;

the deformation grooves (201) are arranged on one side of the outer sheath (20), two adjacent deformation grooves (201) are provided with limiting ribs (21), when two adjacent limiting ribs (21) are attached to the side walls of the two adjacent deformation grooves, the outer sheath (20) is bent to the minimum bending diameter to limit the bending radius of the light guide optical fiber (10).

2. Optical fiber beam according to claim 1, wherein the minimum bending radius of the outer sheath (20) is larger than the minimum bending radius of the light guiding fiber (10).

3. The optical fiber beam transmission system for the industrial robot as claimed in claim 2, wherein the distance between two adjacent deformed grooves (201) is 0.5-1.5 times the thickness of the outer sheath (20).

4. The optical fiber beam transmission system for industrial robot as claimed in claim 3, wherein the cross-sectional shape of the deformed groove (201) is set to be square.

5. The optical fiber beam transmission system for industrial robot as claimed in claim 3, wherein the shape of the cross section of the deformed groove (201) is set to be isosceles trapezoid.

6. The optical fiber beam transmission device for the industrial robot is characterized in that a plurality of preformed holes (202) which are symmetrically distributed in the central axis are formed in the inner side of the outer sheath (20), and a reinforced core (30) is arranged in each preformed hole (202).

7. The optical fiber beam transmission system for industrial robot according to claim 6, characterized in that the outer diameter of the reinforcing core (30) is smaller than the inner diameter of the prepared hole (202) so that the reinforcing core (30) can axially slide in the prepared hole (202) after being inserted into the prepared hole (202).

8. The optical fiber beam transmission system for the industrial robot according to claim 7, wherein the inner diameter of the outer sheath (20) is larger than the outer diameter of the light guide fiber (10), so that the outer sheath (20) is sleeved outside the light guide fiber (10) and has a sliding gap (110) with the light guide fiber (10).

9. The optical fiber light beam for industrial robots according to claim 8, characterized in that the reinforcing core (30) comprises a stranded fiber rope, which is stranded to be circular in cross section.

10. Optical fiber beam according to claim 1, characterized in that the outer sheath (20) comprises a thermoplastic polyurethane elastic layer.

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