Cross roller sliding pair

Abstract

The invention discloses a crossed roller sliding pair which comprises a sliding rail and a sliding block. The two sides of the sliding rail are concaved inwards to form receding positions, and first slopes and second slopes are oppositely arranged on the upper sides and the lower sides of the two receding positions correspondingly. The sliding block comprises a sliding seat, extending parts extending into the receding positions are arranged on the two sides of the sliding seat, a plurality of first rolling pieces and a plurality of second rolling pieces are rotationally connected into the extending parts, and the first rolling pieces and the second rolling pieces are arranged in a crossed mode and extend out of the extending parts to make contact with the first inclined face and the second inclined face respectively; according to the sliding block, the first rolling piece and the second rolling piece which are arranged in a crossed mode make contact with the first inclined face and the second inclined face respectively, a bidirectional supporting structure is formed, the radial bearing capacity of the sliding block is improved, when the sliding block bears the radial load, the first rolling piece and the second rolling piece share the load at the same time, and therefore the sliding block can bear the radial load. The rolling parts are not in contact with one another and do not generate mutual friction, so that the heating value is low, the noise is low, and the service life is long.

Description

Technical Field

[0001] The present invention belongs to the technical field of guide rails and sliders, and specifically relates to a crossed roller sliding pair. Background Art

[0002] Guide rails and sliders are both common motion devices in mechanical equipment, and they play important roles in many industrial and manufacturing fields. A guide rail is a linear motion device, usually composed of a long strip-shaped structure, which is used to guide and restrict the movement of a sliding object. A slider is a device that moves on a guide rail and can have the ability of linear motion through contact with the guide rail.

[0003] Currently, the mainstream sliders on the market are mostly steel ball circulation type sliders. For example, Chinese Patent Document CN206347029U discloses a compact micro linear guide rail, which includes a guide rail, a slider and steel balls. The slider slides back and forth left and right along the length direction of the guide rail through the steel balls. The left and right ends of the slider along the length direction of the guide rail are respectively connected with a reverser gasket, a reverser and an oil scraper in sequence through screws; the slider is integrally formed by powder metallurgy injection molding or cold drawn profiles. The front and rear sides of the slider respectively extend downward to form sliding parts for assembling with the guide rail; the inner side of the sliding part is provided with a slider steel ball groove, which cooperates with the guide rail steel ball groove provided on the guide rail to form a sliding groove for the steel balls to roll; a steel ball return channel is arranged inside the sliding part, and an arc return channel for connecting the sliding grooves on the same side and the steel ball return channel is arranged on the reverser; the sliding groove, the steel ball return channel and the arc return channel are filled with steel balls. When the slider slides back and forth left and right on the guide rail, the steel balls circulate and roll in the sliding groove, the steel ball return channel and the arc return channel, so as to ensure the smooth movement of the slider.

[0004] However, the steel balls will collide with each other during the circulation process, generating noise; the contact mode between the steel balls and the guide rail is point-line contact, and the contact area is small, which limits the load capacity of the guide rail; when a steel ball slider needs to be transferred from one guide rail to another connecting guide rail, it is easy to occur the phenomenon of steel ball dropping during the process of leaving the original guide rail. Summary of the Invention

[0005] The purpose of the present invention is to provide a crossed roller sliding pair to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A crossed roller sliding pair includes a main guide rail and a slider;

[0008] Both sides of the main guide rail are concave to form avoidance spaces, and inclined surface one and inclined surface two are relatively arranged on the upper and lower sides of the two avoidance spaces;

[0009] The slider includes a slide seat, and extension parts extending into the avoidance position are provided on both sides of the slide seat. A plurality of rolling elements 1 and a plurality of rolling elements 2 are rotatably connected in the extension parts. The rolling elements 1 and 2 are cross-arranged and extend out of the extension parts to contact the inclined plane 1 and the inclined plane 2 respectively; the radial lines of the rolling elements 1 and 2 are perpendicular to the inclined plane 1 and the inclined plane 2 respectively.

[0010] According to a further technical solution, the first rolling element is in contact with the first inclined plane, the second rolling element is in contact with the second inclined plane, and the outer circumferential surface of the first rolling element and the outer circumferential surface of the second rolling element are in line contact with the first inclined plane and the second inclined plane respectively.

[0011] According to a further technical solution, two of the plurality of rolling elements 1 and 2 on both sides are provided respectively, the two rolling elements 1 are respectively arranged at the two ends of the extension part, and the two rolling elements 2 are respectively arranged between the two rolling elements 1.

[0012] A further technical solution is that the inclination angle of slope one is 45 degrees, the inclination angle of slope two is -45 degrees, the axial line direction of rolling element one is parallel to slope one, the axial line direction of rolling element two is parallel to slope two, and both rolling element one and rolling element two maintain a vertical force state with the corresponding slopes.

[0013] According to a further technical solution, longitudinal protrusions and transverse protrusions are respectively provided on both sides of the lower end surface of the slide seat, a longitudinal groove for inserting the longitudinal protrusion is provided on the upper end surface of one extension portion, and a transverse groove for inserting the transverse protrusion is provided on the upper end surface of the other extension portion.

[0014] Beneficial effects of the present invention:

[0015] The present invention can evenly share the pressure when bearing radial loads through the cross-arranged rolling elements. Compared with the axial force mode of traditional roller bearing sliders, the present design has stronger load strength and impact strength, and each rolling element does not contact each other and does not generate friction with each other, thereby generating lower heat, lower noise and extending service life. Compared with traditional ball-type linear sliders, they need to operate in a sealed box filled with grease, and cannot be separated from the lubrication and protection of grease, and cannot easily leave the guide rail, otherwise it will cause the ball to fall off and cause damage. The cross roller guide rail of the present design can be used in an environment without secondary lubricating oil, and each roller is in an independently supported state, so there is no need to worry about the rolling element falling off after the slider leaves the track without the protection of the retaining frame. This special arrangement is particularly suitable for application areas where sliders often run on multiple connecting tracks, which helps to solve the pain point of sliders dropping balls in the return track solution.

[0016] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 : Overall structure diagram of the present invention.

[0018] Figure 2 : Figure 1 Enlarged structure diagram of local A.

[0019] Figure 3 : Bottom structure diagram of the present invention.

[0020] Figure 4 : Structure connection diagram of the main guide rail and the slider of the present invention.

[0021] Figure 5 : Exploded view of the connection between the main guide rail and the slider of the present invention.

[0022] Figure 6 : Cross-section of the connection between the main guide rail and the slider of the present invention Figure 1 .

[0023] Figure 7 : Cross-section of the connection between the main guide rail and the slider of the present invention Figure 2 .

[0024] Reference numerals: 1, workbench; 3, main guide rail; 4, belt drive mechanism; 5, slider; 6, transverse movement device; 7, sub-guide rail; 8, photoelectric sensor; 31, clearance position; 32, first inclined surface; 33, second inclined surface; 41, support platform; 42, support plate; 43, synchronous belt; 411, first passive wheel; 412, second passive wheel; 413, third passive wheel; 414, fourth passive wheel; 415, anti-deviation limit groove; 421, fifth passive wheel; 422, sixth passive wheel; 423, driving wheel; 424, driving motor; 431, teeth; 51, sliding seat; 52, extension part; 53, first rolling element; 54, second rolling element; 55, longitudinal groove; 56, transverse groove; 57, longitudinal protrusion; 58, transverse protrusion. Specific implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] Please refer to Figure 1-7 ;

[0027] A cross roller sliding pair is used in a circulating transfer line, which includes a workbench 1, main rails 3 are symmetrically arranged at both ends of the workbench 1, and the two main rails 3 are both designed with a structural design with an "I"-shaped cross section, and the two sides are concave to form a clearance position 31, and the upper and lower sides of the two clearance positions 31 are relatively arranged with inclined planes 1 32 and inclined planes 2 33. The two main rails 3 are provided with a plurality of sliders 5 driven to move by a belt transmission mechanism 4, and the sliders 5 include a slide seat 51, and extensions 52 are arranged on both sides of the slide seat 51 to extend into the clearance position 31. The slide seat 51 and the extension 52 are locked together by screws, and a plurality of rolling elements 1 53 and a plurality of rolling elements 2 54 are rotatably connected in the extension 52. Preferably, the rolling element 1 53 and the rolling element 2 54 can be roller bearings or needle bearings, etc. The rolling element 1 53 and the rolling element 2 54 are cross-arranged, and extend out of the extension 52 and the inclined plane 1 32 and the inclined plane 2 respectively. 33 contact, the cross-arranged rolling elements can evenly share the pressure when bearing radial loads. Compared with the axial force mode of the traditional roller bearing slider 5, this design has stronger load strength and impact strength, and each rolling element does not contact each other, and does not produce mutual friction, so the heat generation is low, the noise is low, and the service life is extended. Compared with the traditional ball-type linear slider, they need to be operated in a sealed box filled with grease, and they cannot be separated from the lubrication and protection of grease, and they cannot leave the guide rail easily, otherwise it will cause the ball to fall off and cause damage. The cross roller guide rail of this design can be used in an environment without secondary lubricating oil, and each roller is in an independently supported state, so there is no need to worry about the slider 5 falling off the track without the protection of the cage. The rolling element, this special arrangement is particularly suitable for the application field where the slider 5 often runs on multiple connecting tracks, which helps to solve the pain point of the slider falling off the ball in the return track solution;

[0028] On the outer sides of both ends shared by the two main guide rails 3, a transverse movement device 6 is provided. The transverse movement device 6 preferably adopts a common linear motor module on the market. On both of the two transverse movement devices 6, a secondary guide rail 7 is provided. A heightening block is arranged on the transverse movement device 6 to ensure that the height of the secondary guide rail 7 is the same as that of the main guide rail 3. The two secondary guide rails 7 have the same outer shape structure as the two main guide rails 3 and can be docked. The specific working principle is as follows: The slider 5 is driven by the belt drive mechanism 4 of the main guide rail 3 to move to the end. The transverse movement device 6 is started to dock the secondary guide rail 7 with the main guide rail 3. The slider 5 moves onto the secondary guide rail 7. Then the transverse movement device 6 is started to transfer the slider 5 onto the other main guide rail 3. Then the belt drive mechanism 4 of the other main guide rail 3 immediately drives the slider 5 to move along the track to the opposite end. At this time, the transverse movement device 6 on the other side is started to cooperate with the secondary guide rail 7 to transfer the slider 5 back to the original main guide rail 3 again. The slider 5 moves along the main guide rail 3 to the starting point to complete a single cycle. The system continuously runs in a cycle, thus forming a continuous transfer closed-loop circuit. This transfer line can be used for product loading / unloading and processing transfer. For example, one main guide rail 3 is the loading / unloading end, and the initial position of the slider 5 is at the loading / unloading end position. The other main guide rail 3 is the processing end, and there is processing equipment outside the processing end. A load-carrying fixture is placed on the slider 5. The product to be processed is placed on the load-carrying fixture manually or by a robotic arm. Then the product to be processed is transferred to the position of the processing equipment at the processing end through the transfer line. After being processed by the processing equipment, it is transferred back to the initial position at the loading / unloading end through the transfer line. Then the processed product is taken out manually or by a robotic arm, and the subsequent product to be processed is put in, and the above steps are repeated for continuous cyclic transfer processing.

[0029] In this embodiment, the first rolling element 53 contacts the first inclined surface 32, and the second rolling element 54 contacts the second inclined surface 33. The outer circumferential surfaces of the first rolling element 53 and the second rolling element 54 respectively form line contacts with the first inclined surface 32 and the second inclined surface 33. The radial lines of the two rolling elements are perpendicularly arranged with respect to the corresponding inclined surfaces, ensuring that the contact force between the rolling elements and the inclined surfaces is transmitted along the radial direction of the rolling elements, and eliminating the problem of eccentric wear caused by lateral component forces. The first rolling element 53 and the second rolling element 54 perform pure rolling on the inclined surfaces, reducing sliding friction, improving the smoothness of movement, replacing sliding friction with rolling friction, reducing wear, and still being able to maintain the movement accuracy after long-term use.

[0030] In this embodiment, there are two first rolling elements 53 and two second rolling elements 54 on both sides. The two first rolling elements 53 are respectively arranged at both ends of the extension part 52, and the two second rolling elements 54 are respectively arranged between the two first rolling elements 53. Preferably, the number of rolling elements can be increased correspondingly according to the length of the slider 5 to ensure the load-bearing capacity of the slider 5; in addition, the first rolling elements 53 and the second rolling elements 54 can also be arranged at intervals, or the second rolling elements 54 are arranged at both ends of the extension part 52, and the first rolling elements 53 are arranged between the two second rolling elements 54, which is not limited herein.

[0031] The first rolling element 53 and the second rolling element 54 are roller bearings. The inclination angles of the roller bearings can be 15°, 25°, and 40°, which reduce the contact area between the first rolling element 53 and the second rolling element 54, thereby reducing friction to achieve high-speed movement, and thus achieving an operating speed of up to 10 m / s and a high acceleration of up to 10G (98 m / s²). In this embodiment, the inclination angle of the first inclined surface 32 is 45 degrees, the inclination angle of the second inclined surface 33 is -45 degrees, and the included angle between the first inclined surface 32 and the second inclined surface 33 is 90 degrees. The layout with a 90-degree intersection fully balances the load, solves the problems of axial runout and axial clearance, has a balanced force, ensures smooth and quiet operation. The axial line direction of the first rolling element 53 is parallel to the first inclined surface 32, and the axial line direction of the second rolling element 54 is parallel to the second inclined surface 33, so that the first rolling element 53 and the second rolling element 54 are always in a state of perpendicular force with the corresponding inclined surface during the rolling process, decomposing the external load into a radial force perpendicular to the axis of the rolling element, eliminating the influence of the lateral component force on the movement of the rolling element, ensuring that the contact between the rolling element and the inclined surface is pure rolling friction, reducing the movement resistance. At the same time, compared with the axial force application method of the traditional roller bearing slider 5, this design has more advantages in terms of load strength and impact resistance.

[0032] In this embodiment, longitudinal protrusions 57 and transverse protrusions 58 are respectively provided on both sides of the lower end surface of the slide base 51. A longitudinal groove 55 for inserting the longitudinal protrusion 57 is provided on the upper end surface of one extension part 52, and a transverse groove 56 for inserting the transverse protrusion 58 is provided on the upper end surface of the other extension part 52. The cooperation between the longitudinal protrusion 57 and the longitudinal groove 55 restricts the lateral displacement of the slide base 51, and the cooperation between the transverse protrusion 58 and the transverse groove 56 restricts the longitudinal displacement of the slide base 51, avoiding the phenomenon that the screws become loose after the slider 5 is used for a long time, resulting in the slide base 51 moving back and forth under the action of vibration or inertia, thereby ensuring the fixing effect of the installation of the slide base 51 and the two extension parts 52.

[0033] In this embodiment, two belt driving mechanisms 4 are respectively arranged outside the corresponding main guide rails 3 and are parallel to the main guide rails 3. Each of the two belt driving mechanisms 4 includes a support platform 41 arranged above the workbench 1 and a support plate 42 arranged below the workbench 1. On both sides of the support platform 41, a first driven pulley 411 and a second driven pulley 412 are symmetrically installed. At the bottom of the support platform 41, a third driven pulley 413 and a fourth driven pulley 414 are installed. On one side of the support plate 42, a fifth driven pulley 421 and a sixth driven pulley 422 are symmetrically arranged. Above the middle of the fifth driven pulley 421 and the sixth driven pulley 422, a driving pulley 423 is arranged. On the other side of the support plate 42, a driving motor 424 for driving the driving pulley 423 to rotate is arranged. By winding a synchronous belt 43 around the outer ends of the first driven pulley 411, the second driven pulley 412, the third driven pulley 413, the fourth driven pulley 414, the fifth driven pulley 421, the sixth driven pulley 422 and the driving pulley 423 to form a closed loop, several sliders 5 are driven to move. On the top of the support platform 41, there is an anti-deviation limit groove 415 through which the synchronous belt 43 passes. The anti-deviation limit groove 415 supports the lower surface of the synchronous belt 43 through the bottom and restricts its lateral deviation by using both side walls, ensuring the smooth operation of the synchronous belt 43 and preventing the synchronous belt 43 from deforming due to external forces and separating from the slider 5, thus avoiding the problem that the slider 5 cannot move. On the outer side of the synchronous belt 43, several teeth 431 are arranged. Teeth (not shown in the figure) are also arranged on both sides of the slider 5 for meshing with the teeth 431 of the synchronous belt 43. Specifically, when the driving motor 424 is started and drives the driving pulley 423 to rotate, the synchronous belt 43 moves accordingly. Through the meshing between the teeth 431, the slider 5 is driven by the synchronous belt 43 to move along the main guide rail 3.

[0034] In this embodiment, photoelectric sensors 8 for detecting the position of the slider 5 are installed on the outer sides of both ends of the support platform 41. The photoelectric sensors 8 determine the exact position of the slider 5 by measuring the distance between themselves and the slider 5, thereby indirectly obtaining the position information of the sub-guide rail 7 to ensure the accurate docking of the sub-guide rail 7 and the main guide rail 3.

[0035] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0036] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. A cross roller sliding pair, comprising a main guide rail (3) and a sliding block (5), It is characterized by: The two sides of the main guide rail (3) are inwardly concave to form a clearance position (31), and the upper and lower sides of the two clearance positions (31) are oppositely provided with a first inclined surface (32) and a second inclined surface (33); The slider (5) comprises a slide seat (51), and extension portions (52) extending into the avoidance position (31) are provided on both sides of the slide seat (51); a plurality of first rolling elements (53) and a plurality of second rolling elements (54) are rotatably connected in the extension portions (52); the first rolling elements (53) and the second rolling elements (54) are arranged crosswise and extend out of the extension portions (52) to contact the first inclined surface (32) and the second inclined surface (33); and radial lines of the first rolling element (53) and the second rolling element (54) are perpendicular to the first inclined surface (32) and the second inclined surface (33), respectively.

2. A cross roller sliding pair according to claim 1, characterized in that: The first rolling element (53) contacts the first inclined surface (32), and the second rolling element (54) contacts the second inclined surface (33). The outer circumferential surface of the first rolling element (53) and the outer circumferential surface of the second rolling element (54) form line contact with the first inclined surface (32) and the second inclined surface (33) respectively.

3. A cross roller sliding pair according to claim 1, characterized in that: The plurality of rolling elements 1 (53) and rolling elements 2 (54) on both sides are each provided with two, the two rolling elements 1 (53) are respectively arranged at the two ends of the extension portion (52), and the two rolling elements 2 (54) are respectively arranged between the two rolling elements 1 (53).

4. A cross roller sliding pair according to claim 1, characterized in that: The inclination angle of the inclined plane 1 (32) is 45 degrees, the inclination angle of the inclined plane 2 (33) is -45 degrees, the axial line direction of the rolling element 1 (53) is parallel to the inclined plane 1 (32), the axial line direction of the rolling element 2 (54) is parallel to the inclined plane 2 (33), and the rolling element 1 (53) and the rolling element 2 (54) are both in a vertical force state with respect to the corresponding inclined planes.

5. The cross roller sliding pair according to claim 1, characterized in that: A longitudinal protrusion (57) and a transverse protrusion (58) are respectively provided on both sides of the lower end surface of the slide seat (51); a longitudinal groove (55) for inserting the longitudinal protrusion (57) is provided on the upper end surface of one extension portion (52); and a transverse groove (56) for inserting the transverse protrusion (58) is provided on the upper end surface of the other extension portion (52).

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