A vertical rotary drive device suitable for large overturning torque working conditions

Abstract

The invention relates to a vertical rotary drive device suitable for large overturning torque working conditions, which comprises a box, a worm assembly, an upper ring, a rolling body, a spacer block, a lower gasket with a rolling track, a pressure ring with a sliding rail, an adjusting gasket, a guide rail soft belt, a supporting lower seal, a supporting upper seal, a box seal and a positioning pin. The worm assembly and the gear ring of the upper ring constitute a worm drive function component, the lower gasket with a rolling track, the rolling body, the spacer block and the rolling track of the upper ring constitute a single-row thrust rolling support function component, and the pressure ring with a sliding rail, the guide rail soft belt and the sliding rail of the upper ring constitute a thrust sliding support function component. The axial load is borne by the single-row thrust rolling support function component, and the overturning torque is borne by the thrust rolling support and the thrust sliding support function components. The invention has the following characteristics: the invention has all the functions of a rotary drive device, is suitable for vertical installation occasions, has reasonable stress, and the rotary drive function is realized by the worm drive function component; the invention has a simple structure, the rotary bearing clearance and the stiffness of the rotary drive device are controllable and adjustable, the wear-resistant guide rail soft belt can improve the damping of the device and is beneficial to vibration absorption and noise reduction.

Description

TECHNICAL FIELD

[0001] The present application relates to a vertical rotary drive device, especially suitable for large overturning torque working conditions. BACKGROUND

[0002] The slewing bearing is also known as the rotary bearing, which is a nearly super large rolling bearing, and its structure is evolved from the general rolling bearing. According to the standard CB / T 3669-2013 and JB / T 2300-2018, the slewing bearing can be divided into four series according to the structure type: 01 series, single row four-point contact ball type slewing bearing; 02 series, double row different diameter ball type slewing bearing; 11 series, single row crossed roller type slewing bearing; 13 series, three row roller type slewing bearing. The slewing bearing has various structure types, is suitable for various load working conditions, and is widely used in the fields of hoisting machinery, engineering machinery, transportation machinery, metallurgical machinery, military equipment, medical machinery and new energy, etc.

[0003] The rotary drive device is a general type of speed reduction transmission mechanism which integrates the functions of driving and slewing, and is formed by taking the slewing bearing as the transmission driven part and the mechanism attachment part, and configuring the main transmission components such as gear transmission or worm and worm gear transmission. Among them, the worm and worm gear type rotary drive device is suitable for low speed occasions, has strong carrying capacity, and has broad application prospects.

[0004] However, whether it is the standard JB / T 11993-2014 or the existing rotary drive product, the bearing link mostly adopts the structure scheme of the single row four-point contact ball type slewing bearing, which is evolved from the general deep groove ball bearing. The structure mainly consists of an inner ring, an outer ring, rolling elements and a spacer, wherein the interface between the inner and outer rings is a cylindrical surface. This structure makes the deep groove ball bearing suitable for working conditions of bearing radial load or cooperating with small axial load. Admittedly, for the single row four-point contact ball type slewing bearing, the gap of the interface between the inner and outer rings is much smaller than that of the deep groove ball bearing, and theoretically its carrying capacity for axial load is improved. However, for the typical vertical installation and large overturning torque working condition, the existing rotary drive device has insufficient rigidity, large deformation under load, the bearing link is in two-point contact state under the action of large overturning torque, and the correct meshing condition of the worm and worm gear transmission is destroyed, etc. In practice, the existing rotary drive device is prone to generate large vibration and noise, which has become a difficult problem to be solved when applying the vertical rotary drive device. SUMMARY

[0005] The purpose of the present application is to provide a vertical rotary drive device suitable for large overturning torque working conditions, and through the structural optimization of the bearing link, the downward axial load and overturning torque are reasonably borne, the play of the bearing link is easy to adjust, the rigidity of the drive device is controllable and adjustable, and the working damping of the vertical rotary drive device is effectively provided to achieve the purpose of vibration absorption and noise reduction.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] A vertical rotary drive device suitable for large overturning moment conditions includes a worm gear assembly, an upper ring, rolling elements, a spacer block, a lower washer with raceways, a pressure ring with a slide rail, adjusting shims, a guide rail belt, a lower support seal, an upper support seal, a housing seal, locating pins, and bolts. The worm gear assembly includes worm gear parts, bearings, adjusting shims, and end caps, with the worm gear shaft end consisting of a bearing, adjusting shims, and an end cap in sequence.

[0008] The outer cylindrical surface of the upper ring has a toothed ring, which, together with the worm gear assembly, forms a worm gear transmission functional component. During operation, the worm gear drives the toothed ring to rotate.

[0009] The upper end face of the upper ring is machined with a set of threaded holes, which are used to connect the rotary drive device to the external rotating parts via screws;

[0010] The inner side of the upper ring is a stepped cylindrical surface. From bottom to top, the cylindrical surface is equipped with a lower support seal, a lower washer, an adjusting shim, a guide rail belt, a pressure ring, and an upper support seal.

[0011] The upper ring is supported by the lower washer through rolling elements, and the rolling elements are separated by spacers. The lower washer is fixed to the housing with bolts.

[0012] The positioning of the lower washer and the housing is achieved by positioning pins; the end face of the lower washer has two sets of threaded holes, one set for connecting with the housing and the other set for connecting with the pressure ring with slide rail.

[0013] An annular raceway is machined on one end face of the upper ring. The outer normal of this end face points directly downward. The raceway, together with the lower washer with the raceway, the rolling element, and the spacer block, forms a single-row thrust rolling support functional component. In a vertical rotary drive device, this functional component bears the downward axial load.

[0014] The upper ring has a slide rail on one end face, and the outer normal of the end face points directly upward. The slide rail, together with the pressure ring and guide rail soft belt, forms a thrust sliding support functional component. In the vertical rotary drive device, this component, together with the single-row thrust rolling support functional component, bears the overturning moment.

[0015] The rolling elements and spacers are located in the raceway space between the upper ring and the lower washer with raceways, and are distributed alternately.

[0016] The lower washer and upper ring with raceways are sealed by supporting the lower sealing component;

[0017] The pressure ring and upper ring with slide rails are sealed by the upper sealing parts of the support;

[0018] The upper ring and the housing are sealed by housing sealing parts;

[0019] The closed cavity is filled with lubricating medium;

[0020] Between the lower gasket with rolling track and the pressure ring with sliding track, an adjusting gasket with variable thickness is used to adjust the play of the single-row thrust rolling support functional component and the thrust sliding support functional component, and further to control the rigidity of the vertical rotary drive device.

[0021] The guide rail soft belt is pasted on the sliding track of the pressure ring with sliding track, which can effectively reduce the friction of the thrust sliding support functional component, realize the friction reduction and wear resistance, and effectively provide the working damping of the vertical rotary drive device and realize the vibration absorption and noise reduction.

[0022] The assembly sequence and working process of the present application are as follows:

[0023] Assembly of the support component. The lower gasket with rolling track is regarded as the assembly base part, and the track surface faces upward. The lower sealing part is assembled in the groove near the lower end surface of the lower gasket with rolling track. The rolling body and the spacer are alternately and uniformly arranged in the rolling track of the lower gasket. The lubricating medium is uniformly coated on the rolling body and the spacer. The upper ring is assembled, and the rolling track surface thereof faces downward. The bolt hole is prefabricated on the adjusting gasket, and the adjusting gasket is assembled on the upper end surface of the lower gasket with rolling track. The guide rail soft belt is pasted on the sliding track of the pressure ring with sliding track. After the pasting glue is cured, the pressure ring with sliding track is assembled on the lower gasket with rolling track, and the guide rail surface thereof faces downward, and the lubricating medium is coated. A set of bolts is used to connect the pressure ring with sliding track and the lower gasket with rolling track. The thickness of the adjusting gasket is changed to make the support component have a reasonable play. The pre-tightening force is applied to the bolt set to make the support component have a reasonable rigidity. The upper sealing part is assembled in the groove of the upper ring.

[0024] Final assembly of the rotary drive device. The box body is regarded as the assembly base part, and the worm wheel faces the inlet upward. The worm assembly is assembled to the box body, and the lubricating medium is coated on the bearing part. The support component is assembled into the box body, and a set of connecting bolts is pre-tightened to fix the support component in the box body. The worm and worm wheel transmission pair is adjusted to have a suitable tooth side gap and contact area, and the connecting bolt is tightened. The lubricating medium is coated on the worm wheel teeth. The box body sealing part is assembled. The hinge pin hole is drilled on the box body and the lower gasket with rolling track, and the positioning pin is assembled.

[0025] When working, the rotary drive device is installed by vertical installation mode. The box body is fixedly connected with the base, the rotary movement part of the output end is fixedly connected with the upper ring, and the upper ring is below the lower gasket with a rolling track. The prime mover (such as a hydraulic motor or a motor) is installed at one end of the worm. The prime mover drives the worm to rotate, the worm drives the gear ring on the upper ring to rotate, and the reduction function is realized. The upper ring rotates under the support and guidance of the rolling track. The single-row thrust rolling support functional part bears the downward axial load; the thrust sliding support functional part bears the overturning moment together with the single-row thrust rolling support functional part; the guide rail soft belt can effectively reduce the friction of the thrust sliding support functional part, realize the friction reduction and wear resistance, and effectively provide the working damping of the vertical rotary drive device and realize vibration absorption and noise reduction.

[0026] Compared with the prior art, the vertical rotary drive device suitable for large overturning moment working conditions has the following advantages: the vertical rotary drive device suitable for large overturning moment working conditions; the structure of the supporting link is optimized, so that the downward axial load and the overturning moment are reasonably borne, wherein the single-row thrust rolling support functional part bears the downward axial load, and the thrust sliding support functional part bears the overturning moment together with the single-row thrust rolling support functional part; the thickness-adjustable adjusting gasket is adopted to adjust the play of the single-row thrust rolling support functional part and the thrust sliding support functional part, so as to control the rigidity of the vertical rotary drive device; the guide rail soft belt is pasted on the sliding rail, which can effectively reduce the friction of the thrust sliding support functional part, realize the friction reduction and wear resistance, and effectively provide the working damping of the vertical rotary drive device and realize vibration absorption and noise reduction. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a sectional view of the present application; wherein 1: box body, 2: worm assembly, 3: upper ring, 4: rolling body, 5: isolation block, 6: lower gasket with rolling track, 7: adjusting gasket, 8: compression ring with sliding rail, 9: guide rail soft belt, 10: supporting lower seal, 11: box body seal, 12: supporting upper seal, 13: positioning pin.

[0028] Figure 2 is a structural schematic view of the upper ring of the present application.

[0029] Figure 3 is a structural schematic view of the lower gasket of the present application.

[0030] Figure 4 is a structural schematic view of the compression ring of the present application. DETAILED DESCRIPTION

[0031] Example 1:

[0032] The vertical rotary drive device suitable for large overturning moment working conditions is as follows Figure 1As shown, in the structure, the worm transmission function component transmits the motion and power between the space staggered shafts, and the transmission type can be, but is not limited to, the following examples: cylindrical worm-worm wheel pair, cylindrical worm-cylindrical gear pair, toroidal worm-cylindrical gear pair, and toroidal worm-worm wheel pair; in the structure, the single-row thrust rolling bearing function component mainly bears the one-way axial load, and the transmission type can be, but is not limited to, the following examples: thrust ball bearing and thrust roller bearing; in the structure, the thrust sliding bearing function component and the single-row thrust rolling bearing function component bear the overturning moment together, the thrust rolling bearing-thrust sliding bearing combined structure is simple, and the play is easy to adjust, and then the rigidity of the rotary drive device is adjusted; in the structure, the guide rail soft belt can be pasted on the slide rail of the slide rail pressure ring, or can be pasted on the slide rail of the upper ring; in the structure, the material of the guide rail soft belt can be, but is not limited to, the following examples: polytetrafluoroethylene soft belt, nano high molecular self-lubricating soft belt based on PTFE, and wear-resistant soft belt.

[0033] Of course, the above description is not a limitation of the present application, and the present application is not limited to the above examples. Changes, modifications, additions or replacements made by the person skilled in the art within the essential scope of the present application should also belong to the protection scope of the present application.

Claims

1. A vertical rotary drive device suitable for large overturning moment conditions, comprising a housing (1), a worm gear assembly (2), an upper ring (3), rolling elements (4), a spacer block (5), a lower washer with a raceway (6), a pressure ring with a slide rail (8), an adjusting shim (7), a guide rail belt (9), a lower support seal (10), an upper support seal (12), a housing seal (11), and a positioning pin (13); the worm gear assembly (2) includes worm parts, bearings, adjusting shims, and end caps, and is assembled inside the housing (1); the outer cylindrical surface of the upper ring (3) has a gear ring, and the gear ring and the worm gear assembly (2) constitute a worm gear transmission functional component, in which the worm drives the gear ring to rotate during operation; a set of threaded holes are distributed on the upper end face of the upper ring (3) for... A rotary drive device for connecting with external rotating parts; the rolling element (4) and the spacer (5) are located in the raceway space between the upper ring (3) and the lower washer (6) with raceway, and are alternately distributed; the end face of the lower washer (6) with raceway has two sets of threaded holes, one set for connecting with the housing (1) and the other set for connecting with the pressure ring (8) with slide rail; the lower washer (6) with raceway and the upper ring (3) are sealed by the support lower seal (10); the lower washer (6) with raceway and the housing (1) are positioned by the positioning pin (13); the pressure ring (8) with slide rail and the upper ring (3) are sealed by the support upper seal (12); the upper ring (3) and the housing (1) are sealed by the housing seal (11); the sealed cavity is filled with lubricating medium; characterized in that: The upper ring (3) has a raceway on one end face, and the outer normal of the end face points directly downward. The raceway, together with the lower washer (6) with the raceway, the rolling element (4) and the isolation block (5), forms a single-row thrust rolling support functional component. The upper ring (3) has a slide rail on one end face, and the outer normal of the end face points directly upward. The slide rail, together with the pressure ring (8) with the slide rail and the guide rail soft belt (9), forms a thrust sliding support functional component.

2. The vertical rotary drive device suitable for large overturning moment conditions according to claim 1, characterized in that: Between the lower washer (6) with raceway and the pressure ring (8) with slide rail, a variable thickness adjustment shim (7) is used to adjust the clearance of the single-row thrust rolling bearing functional component and the thrust sliding bearing functional component, thereby controlling the stiffness of the vertical rotary drive device.

3. The vertical rotary drive device suitable for large overturning moment conditions according to claim 1, characterized in that: A guide rail soft strip (9) is pasted on the slide rail of the pressure ring (8). The guide rail soft strip (9) can effectively reduce the friction of the thrust sliding support functional components and achieve friction reduction and wear resistance. The guide rail soft strip (9) can effectively provide working damping for the vertical rotary drive device and achieve vibration absorption and noise reduction.

4. The vertical rotary drive device suitable for large overturning moment conditions according to claim 1, characterized in that: The thrust rolling bearing functional component bears the axial load in the vertical rotary drive device; the thrust sliding bearing functional component and the single-row thrust rolling bearing functional component together form a thrust rolling bearing-thrust sliding bearing combination, which together bears the overturning moment.

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