Guide wheel set with adjustable spacing and low contact stress

Abstract

The distance-adjustable low-contact-stress guide wheel set comprises a mounting frame, a moving frame, a distance adjusting structure and a roller structure, the mounting frame is provided with a first wall and a second wall which are oppositely arranged front and back, sliding grooves extending left and right are formed in the outer side of the first wall and the outer side of the second wall, the moving frame is in a U shape, and sliding blocks are connected to the two side walls of the moving frame; the movable frame is mounted on the mounting frame from the lower side, a sliding block on one side wall of the movable frame is matched with a sliding groove in the first wall, and a sliding block on the other side wall of the movable frame is matched with a sliding groove in the second wall, so that the movable frame can slide left and right relative to the mounting frame; the distance adjusting structure is installed on the installation frame and further connected with the moving frame, the rolling wheel structure is installed on the lower side of the moving frame, and the distance adjusting structure can adjust the position of the moving frame in the left-right direction so as to adjust the distance between the rolling wheel structure and the sliding rail in the left-right direction. The distance between the vehicle body and the sliding rail can be actively adjusted, and the probability of inclination of the vehicle body is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical engineering, and in particular relates to a guide wheel set with adjustable spacing and low contact stress. Background Art

[0002] At present, the existing guiding methods of mobile trolleys on the market include rim guiding, guide block guiding, guide wheel guiding, etc. Among them, rim guiding is to add a flange on the side of the load-bearing wheel, which has low guiding accuracy and will exert lateral force on the load-bearing wheel; guide block guiding mostly uses high-hardness wear-resistant material sliders, which cannot be used on the aluminum alloy track used by this mobile trolley; guide wheel guiding mostly uses four groups of rollers with fixed spacing in the front, back, left and right, and the four groups of rollers and two groups of tracks form symmetrical rolling pair contact pairs to achieve guidance. In actual use, due to the inconsistency between the track spacing and the roller spacing, the car body often deflects, resulting in only the two diagonal rollers playing a guiding role, while the other diagonal roller is separated from the track to form a gap. With the increase of wear and tear, the guiding gap will further increase, and the car body will further tilt until abnormal noise and wear occur, and even the movement of the car body is affected. Summary of the invention

[0003] In view of this, the present invention provides a guide wheel group with adjustable spacing and low contact stress, which can actively adjust the spacing between the guide wheel group and the slide rail to reduce the probability of tilting of the vehicle body.

[0004] The technical solution adopted by the present invention is:

[0005] A guide wheel group with adjustable spacing and low contact stress, comprising a mounting frame, a moving frame, a spacing adjustment structure and a roller structure, the mounting frame having a first wall and a second wall arranged opposite to each other in front and back, a slide groove extending left and right is arranged on the outer sides of the first wall and the second wall, the moving frame is U-shaped, two side walls of the moving frame are connected with sliders, the moving frame is mounted on the mounting frame from the bottom, the slider on one side wall of the moving frame cooperates with the slide groove on the first wall, and the slider on the other side wall of the moving frame cooperates with the slide groove on the second wall, so that the moving frame can slide left and right relative to the mounting frame;

[0006] The distance adjusting structure is installed on the mounting frame, and the distance adjusting structure is also connected to the moving frame. The roller structure is installed on the lower side of the moving frame. The distance adjusting structure can adjust the position of the moving frame in the left and right directions to adjust the distance between the roller structure and the slide rail in the left and right directions.

[0007] Preferably, the mounting frame further comprises a third wall and a fourth wall which are arranged opposite to each other, the third wall and the fourth wall are arranged opposite to each other on the left and right sides, the first wall, the third wall, the second wall and the fourth wall are sequentially connected in the circumferential direction to form a rectangular frame structure, the third wall is provided with a first rotating hole, the fourth wall is provided with a second rotating hole, and the first rotating hole and the second rotating hole are aligned in the left-right direction;

[0008] The pitch adjustment structure comprises a pitch adjustment screw, a main wheel shaft and a nut, a threaded hole is provided at the upper end of the main wheel shaft, the axial direction of the threaded hole extends along the radial direction of the main wheel shaft, the pitch adjustment screw passes through the first rotating hole, the threaded hole and the second rotating hole in sequence, and the pitch adjustment screw is threadedly matched with the threaded hole, the head of the pitch adjustment screw abuts against the third wall, and the nut is connected to the free end of the pitch adjustment screw to lock the pitch adjustment structure;

[0009] The main wheel shaft is vertically arranged and connected to the moving frame.

[0010] Preferably, a matching hole is provided on the bottom wall of the movable frame, the main wheel shaft passes through the matching hole, and the lower end of the main wheel shaft is connected to the roller structure.

[0011] Preferably, the roller structure comprises a rotating bracket and two rollers, the rotating bracket is an H-shaped structure, the rotating bracket comprises a first mounting plate, a second mounting plate and a connecting portion, the first mounting plate and the second mounting plate are arranged at an interval up and down, the middle part of the first mounting plate and the middle part of the second mounting plate are connected through the connecting portion, the connecting portion is provided with a rotating hole, and the lower end of the main wheel shaft is rotatably matched with the rotating hole;

[0012] The two rollers are located on both sides of the connecting portion, and the rollers are installed between the first mounting plate and the second mounting plate through a secondary wheel shaft.

[0013] Preferably, a first sliding bearing is arranged in the rotating hole, and the lower end of the main wheel shaft is plugged into the first sliding bearing.

[0014] Preferably, the lower side of the bottom wall is recessed upward to form an annular groove, the annular groove is located at the matching hole, the first mounting plate is arranged adjacent to the bottom wall, a first thrust washer is arranged in the annular groove, and the lower side of the first thrust washer abuts against the first sliding bearing.

[0015] Preferably, the roller comprises a second sliding bearing, a wheel body and a polyurethane elastic layer which are sequentially arranged inside and outside, and the secondary wheel shaft passes through a center hole of the second sliding bearing.

[0016] Preferably, second thrust washers are respectively provided on the upper and lower sides of the roller, the upper side of the second sliding bearing of the roller abuts against the first mounting plate through a second thrust washer, and the lower side of the second sliding bearing of the roller abuts against the second mounting plate through another second thrust washer.

[0017] Preferably, the mounting frame further comprises a top wall, and the upper end of the first wall and the upper end of the second wall are connected through the top wall;

[0018] It also includes a mounting seat, which is connected to the top wall via mounting screws.

[0019] Preferably, the mounting seat comprises a vertical frame, a cover plate and a rib plate, the cover plate is connected to the lower side of the vertical frame, the lower side of the cover plate is recessed upward to form a positioning groove, the top wall protrudes upward to form a positioning block, and the positioning block is inserted and matched with the positioning groove;

[0020] There are multiple rib plates, each of which is welded to the outer side of the vertical frame. Each rib plate has an upward supporting surface, and the supporting surface is flush with the upper end surface of the vertical frame.

[0021] Beneficial effects of the present invention:

[0022] The distance between the roller structure and the slide rail can be adjusted by the distance adjusting structure. When the distance between the roller structure and the slide rail is too large or too small, the distance adjusting structure is used to adjust the distance so that the distance meets the requirements, thereby reducing the probability of the vehicle body tilting during sliding. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0024] Figure 1 It is a schematic diagram of the structure of a guide wheel set with adjustable spacing and low contact stress;

[0025] Figure 2 It is a structural schematic diagram of the mounting frame, the mobile frame, and the distance adjustment structure;

[0026] Figure 3 yes Figure 2 A cross-sectional view of the structure;

[0027] Figure 4 It is a structural schematic diagram of the roller structure;

[0028] Figure 5 It is a cross-sectional view of the roller structure;

[0029] Figure 6 It is a structural diagram of the mounting base;

[0030] Figure 7 It is a schematic diagram of the matching relationship between the guide wheel group and the slide rail.

[0031] In the figure: 1. Mounting frame; 2. Moving frame; 3. Roller structure; 4. Adjustable distance structure; 5. Mounting seat; 6. Slide rail;

[0032] 11. first wall; 12. slide groove; 13. top wall; 14. positioning block; 15. mounting screws;

[0033] 21. Slider; 22. Bottom wall;

[0034] 31. first mounting plate; 32. second mounting plate; 33. connecting portion; 34. roller; 35. secondary wheel shaft; 36. first sliding bearing; 37. first thrust washer; 38. second thrust washer;

[0035] 341. second sliding bearing; 342. wheel body;

[0036] 41. Adjustment screw; 42. Main wheel shaft; 43. Nut;

[0037] 51. Vertical frame; 52. Cover plate; 53. Rib plate; 54. Positioning groove. DETAILED DESCRIPTION

[0038] The present invention is described below based on embodiments, but the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail. In order to avoid confusing the essence of the present invention, known methods, processes, procedures, and components are not described in detail.

[0039] In addition, persons of ordinary skill in the art will appreciate that the drawings provided herein are for illustration purposes and are not necessarily drawn to scale.

[0040] Unless the context clearly requires otherwise, throughout the specification and claims, the words "include", "comprising" and similar words should be interpreted in an inclusive sense rather than an exclusive or exhaustive sense; that is, in the sense of "including but not limited to".

[0041] In the description of the present invention, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0042] See also Figure 1-Figure 6The present invention provides a guide wheel group with adjustable spacing and low contact stress (hereinafter referred to as "guide wheel group"), comprising a mounting frame 1, a moving frame 2, a distance adjustment structure 4 and a roller structure 3, wherein the mounting frame 1 has a first wall 11 and a second wall arranged opposite to each other in the front and rear directions, and the outer sides of the first wall 11 and the second wall are provided with a slide groove 12 extending left and right, and the moving frame 2 is U-shaped, and sliders 21 are connected to the two side walls of the moving frame 2, and the moving frame 2 is installed on the mounting frame 1 from the bottom, and the slider 21 on one side wall of the moving frame 2 cooperates with the slide groove 12 on the first wall 11, and the slider 21 on the other side wall of the moving frame 2 cooperates with the slide groove 12 on the second wall, so that the moving frame 2 can slide left and right relative to the mounting frame 1;

[0043] The distance adjusting structure 4 is installed on the mounting frame 1, and the distance adjusting structure 4 is also connected to the moving frame 2. The roller structure 3 is installed on the lower side of the moving frame 2. The distance adjusting structure 4 can adjust the position of the moving frame 2 in the left and right directions to adjust the distance between the roller structure 3 and the slide rail 6 in the left and right directions.

[0044] The guide wheel group of the present invention is applied to a mobile trolley. Support rollers 34 are installed at the four corners of the mobile trolley. There are two slide rails, which extend in the front-to-back direction. The mobile trolley is mounted on the slide rails through four support rollers 34, so that the mobile trolley can slide in the front-to-back direction. In addition, the guide wheel group of the present invention is installed on the mobile trolley. The roller structure 3 of the guide wheel group is aligned with the side of the slide rail from the left or right side and leaves a certain distance. When the mobile trolley deviates from the slide rail, the guide wheel group will abut against the slide rail to prevent the mobile trolley from derailing.

[0045] However, due to problems with the processing or assembly process, when the mobile trolley is installed on the slide rail, the distance between the roller structure 3 and the slide rail may be too small or too large, which may cause certain safety hazards during the operation of the mobile trolley.

[0046] In the guide wheel group of the present invention, when the guide wheel group is installed on the mobile trolley, the position of the mounting frame 1 is fixed relative to the position of the mobile trolley, and a slide groove 12 is provided on the first wall 11 and the second wall of the mounting frame 1. At the same time, a slider 21 is provided on the two side walls of the mobile frame 2. The slider 21 cooperates with the slide groove 12 so that the mobile frame 2 can slide in the left and right directions relative to the mounting frame 1, and the roller structure 3 is installed on the lower side of the mobile frame 2 so that the roller structure 3 can move in the left and right directions, thereby actively adjusting the distance between the roller structure 3 and the slide rail.

[0047] The position of the roller structure 3 in the left-right direction is adjusted by the distance adjustment structure 4. After the adjustment is completed, the distance adjustment mechanism can be locked so that the position of the roller structure 3 relative to the mounting frame 1 in the left-right direction is fixed.

[0048] The mounting frame 1 further comprises a third wall and a fourth wall which are arranged opposite to each other, the third wall and the fourth wall are arranged opposite to each other on the left and right sides, the first wall 11, the third wall, the second wall and the fourth wall are sequentially connected in the circumferential direction to form a rectangular frame structure, the third wall is provided with a first rotating hole, the fourth wall is provided with a second rotating hole, and the first rotating hole and the second rotating hole are aligned in the left-right direction;

[0049] The pitch adjustment structure 4 includes a pitch adjustment screw 41, a main wheel shaft 42 and a nut 43. A threaded hole is provided at the upper end of the main wheel shaft 42. The axial direction of the threaded hole extends along the radial direction of the main wheel shaft 42. The pitch adjustment screw 41 passes through the first rotating hole, the threaded hole and the second rotating hole in sequence. The pitch adjustment screw 41 is threadedly matched with the threaded hole. The head of the pitch adjustment screw 41 abuts against the third wall. The nut 43 is connected to the free end of the pitch adjustment screw 41 to lock the pitch adjustment structure 4.

[0050] The main wheel shaft 42 is vertically arranged, and the main wheel shaft 42 is connected to the moving frame 2 .

[0051] The pitch adjusting screw 41 passes through the first rotating hole and the second rotating hole, and the pitch adjusting screw 41 can rotate. The main wheel shaft 42 is vertically arranged, and the main wheel shaft 42 is connected to the movable bracket, so that the main wheel shaft 42 cannot rotate. At the same time, a threaded hole is provided on the main wheel shaft 42, and the pitch adjusting screw 41 cooperates with the threaded hole. Therefore, when the pitch adjusting screw 41 is rotated, the main wheel shaft 42 is pushed to translate in the left and right directions, so that the movable bracket translates in the left and right directions, and then the position of the roller structure 3 can be adjusted in the left and right directions.

[0052] In actual application, when the position of the roller structure 3 needs to be adjusted, the nut 43 can be loosened first, and then the distance adjustment screw 41 can be turned to adjust the position of the roller structure 3. After adjustment, the nut 43 can be tightened to lock the position of the roller structure 3.

[0053] A matching hole is provided on the bottom wall 22 of the mobile frame 2, through which the main wheel shaft 42 passes, and the lower end of the main wheel shaft 42 is connected to the roller structure 3. The matching hole and the main wheel shaft 42 are matched exactly, which facilitates the assembly of the guide wheel set.

[0054] The function of the moving frame 2 is to limit the moving direction of the main wheel shaft 42 so that the roller structure 3 can stably slide in the left and right directions.

[0055] The roller structure 3 includes a rotating bracket and two rollers 34. The rotating bracket is an H-shaped structure. The rotating bracket includes a first mounting plate 31, a second mounting plate 32 and a connecting portion 33. The first mounting plate 31 and the second mounting plate 32 are arranged at intervals in the upper and lower parts. The middle part of the first mounting plate 31 and the middle part of the second mounting plate 32 are connected by the connecting portion 33. The connecting portion 33 is provided with a rotating hole. The lower end of the main wheel shaft 42 is rotatably matched with the rotating hole.

[0056] The two rollers 34 are located on both sides of the connecting portion 33 , and the rollers 34 are installed between the first mounting plate 31 and the second mounting plate 32 via a secondary wheel shaft 35 .

[0057] Providing two rollers 34 at the same time can reduce the contact stress of a single roller 34 .

[0058] The lower end of the main wheel shaft 42 is rotatably connected to the rotating bracket, so that the rotating bracket can rotate, so that the two rollers 34 can adaptively cooperate with the slide rail, that is, the length direction of the first mounting plate 31 and the second mounting plate 32 is basically located in the front-to-back direction (consistent with the extension direction of the slide rail).

[0059] The two rollers 34 are located at the front and rear sides of the connecting portion 33 , so as to limit the slide rail at the same time.

[0060] A first sliding bearing 36 is disposed in the rotating hole, and the lower end of the main wheel shaft 42 is plugged into the first sliding bearing 36 .

[0061] The lower side of the bottom wall 22 is recessed upward to form an annular groove, and the annular groove is located at the matching hole. The first mounting plate 31 is arranged adjacent to the bottom wall 22. A first thrust washer 37 is provided in the annular groove, and the lower side of the first thrust washer 37 abuts against the first sliding bearing 36.

[0062] The provision of the annular groove and the first thrust washer 37 enables the roller structure 3 to be closely adjacent to the moving frame 2 above and below, making the structure of the guide wheel group more compact and avoiding the influence of the guide wheel group on other structures on the moving trolley.

[0063] The roller 34 includes a second sliding bearing 341 , a wheel body 342 and a polyurethane elastic layer which are sequentially arranged inside and outside. The secondary wheel shaft 35 passes through the center hole of the second sliding bearing 341 .

[0064] The roller 34 is provided with second thrust washers 38 on the upper and lower sides respectively. The upper side of the second sliding bearing 341 of the roller 34 abuts against the first mounting plate 31 through a second thrust washer 38, and the lower side of the second sliding bearing 341 of the roller 34 abuts against the second mounting plate 32 through another second thrust washer 38.

[0065] The mounting frame 1 further includes a top wall 13, and the upper end of the first wall 11 and the upper end of the second wall are connected by the top wall 13;

[0066] It also includes a mounting seat 5, which is connected to the top wall 13 by mounting screws 15. The mounting seat 5 includes a vertical frame 51, a cover plate 52 and a rib plate 53. The cover plate 52 is connected to the lower side of the vertical frame 51, and the lower side of the cover plate 52 is recessed upward to form a positioning groove 54. The top wall 13 protrudes upward to form a positioning block 14, and the positioning block 14 is inserted and matched with the positioning groove 54;

[0067] There are multiple rib plates 53 , which are welded to the outer side of the vertical frame 51 , and have an upward supporting surface, which is flush with the upper end surface of the vertical frame 51 , so as to increase the connection strength with the mobile trolley.

[0068] It should be understood that the above-mentioned embodiments are merely illustrative and not restrictive. Without departing from the basic principles of the present invention, various obvious or equivalent modifications or substitutions that can be made by those skilled in the art to the above-mentioned details will all be included in the scope of the claims of the present invention.

Claims

1. A guide wheel set with adjustable spacing and low contact stress, characterized in that: The invention comprises a mounting frame, a movable frame, a distance adjustment structure and a roller structure, wherein the mounting frame has a first wall and a second wall which are arranged opposite to each other in the front and rear directions, and a slide groove extending left and right is arranged on the outer sides of the first wall and the second wall, and the movable frame is U-shaped, and two side walls of the movable frame are connected with sliders, and the movable frame is mounted on the mounting frame from the bottom side, and the slider on one side wall of the movable frame cooperates with the slide groove on the first wall, and the slider on the other side wall of the movable frame cooperates with the slide groove on the second wall, so that the movable frame can slide left and right relative to the mounting frame; The distance adjusting structure is installed on the mounting frame, and the distance adjusting structure is also connected to the moving frame. The roller structure is installed on the lower side of the moving frame. The distance adjusting structure can adjust the position of the moving frame in the left and right directions to adjust the distance between the roller structure and the slide rail in the left and right directions.

2. The guide wheel assembly with adjustable spacing and low contact stress according to claim 1, characterized in that: The mounting frame further comprises a third wall and a fourth wall which are arranged opposite to each other, the third wall and the fourth wall are arranged opposite to each other on the left and right sides, the first wall, the third wall, the second wall and the fourth wall are sequentially connected in the circumferential direction to form a rectangular frame structure, the third wall is provided with a first rotating hole, the fourth wall is provided with a second rotating hole, and the first rotating hole and the second rotating hole are aligned in the left-right direction; The pitch adjustment structure comprises a pitch adjustment screw, a main wheel shaft and a nut, a threaded hole is provided at the upper end of the main wheel shaft, the axial direction of the threaded hole extends along the radial direction of the main wheel shaft, the pitch adjustment screw passes through the first rotating hole, the threaded hole and the second rotating hole in sequence, and the pitch adjustment screw is threadedly matched with the threaded hole, the head of the pitch adjustment screw abuts against the third wall, and the nut is connected to the free end of the pitch adjustment screw to lock the pitch adjustment structure; The main wheel shaft is vertically arranged and connected to the moving frame.

3. The guide wheel assembly with adjustable spacing and low contact stress according to claim 2, characterized in that: A matching hole is provided on the bottom wall of the movable frame, the main wheel shaft passes through the matching hole, and the lower end of the main wheel shaft is connected to the roller structure.

4. The guide wheel assembly with adjustable spacing and low contact stress according to claim 3, characterized in that: The roller structure comprises a rotating bracket and two rollers, the rotating bracket is an H-shaped structure, the rotating bracket comprises a first mounting plate, a second mounting plate and a connecting portion, the first mounting plate and the second mounting plate are arranged with an interval up and down, the middle part of the first mounting plate and the middle part of the second mounting plate are connected by the connecting portion, the connecting portion is provided with a rotating hole, and the lower end of the main wheel shaft is rotatably matched with the rotating hole; The two rollers are located on both sides of the connecting portion, and the rollers are installed between the first mounting plate and the second mounting plate through a secondary wheel shaft.

5. The guide wheel assembly with adjustable spacing and low contact stress according to claim 4, characterized in that: A first sliding bearing is arranged in the rotating hole, and the lower end of the main wheel shaft is plugged into the first sliding bearing.

6. The guide wheel assembly with adjustable spacing and low contact stress according to claim 5, characterized in that: The lower side of the bottom wall is recessed upward to form an annular groove, the annular groove is located at the matching hole, the first mounting plate is arranged adjacent to the bottom wall, a first thrust washer is arranged in the annular groove, and the lower side of the first thrust washer abuts against the first sliding bearing.

7. The guide wheel assembly with adjustable spacing and low contact stress according to claim 4, characterized in that: The roller comprises a second sliding bearing, a wheel body and a polyurethane elastic layer which are sequentially arranged inside and outside, and the secondary wheel shaft passes through the center hole of the second sliding bearing.

8. The guide wheel assembly with adjustable spacing and low contact stress according to claim 5, characterized in that: Second thrust washers are respectively provided on the upper and lower sides of the roller. The upper side of the second sliding bearing of the roller abuts against the first mounting plate through a second thrust washer, and the lower side of the second sliding bearing of the roller abuts against the second mounting plate through another second thrust washer.

9. The guide wheel assembly with adjustable spacing and low contact stress according to any one of claims 1 to 8, characterized in that: The mounting frame further comprises a top wall, and an upper end of the first wall and an upper end of the second wall are connected by the top wall; It also includes a mounting seat, which is connected to the top wall via mounting screws.

10. The guide wheel assembly with adjustable spacing and low contact stress according to claim 9, characterized in that: The mounting seat comprises a vertical frame, a cover plate and a rib plate, wherein the cover plate is connected to the lower side of the vertical frame, the lower side of the cover plate is recessed upward to form a positioning groove, the top wall protrudes upward to form a positioning block, and the positioning block is inserted and matched with the positioning groove; There are multiple rib plates, each of which is welded to the outer side of the vertical frame. Each rib plate has an upward supporting surface, and the supporting surface is flush with the upper end surface of the vertical frame.

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