Central pivot device of mining machinery front shovel excavator

Abstract

This invention discloses a central pivot device for a mining machinery front shovel excavator, comprising an upper bearing sleeve, a C-shaped clamping plate, a stop key, a central pivot, a slip ring tube, a spherical washer, a pivot nut, an anti-loosening key, a lower bearing sleeve, and first and second tie rods. The upper part of the central pivot is clearance-fitted into the center hole of the rotary platform, and the lower part is disposed within a copper sleeve of the base frame. The C-shaped clamping plate and the stop key are fixed on the rotary platform. The spherical washer, pivot nut, and anti-loosening key are disposed within the base frame and located on the lower outer periphery of the central pivot. The copper sleeve and spherical washer are centrally lubricated with dry grease. The slip ring tube is installed through the central pivot, and compressed air lines, lubricating grease lines, and cables leading to the lower mechanism pass through the slip ring tube. The lower part of the slip ring tube is fixed to the base frame by the first and second tie rods. This central pivot device provides a secure and reliable connection, facilitates maintenance, and prevents kinking of the compressed air lines, lubricating grease lines, and cables.

Description

Technical Field

[0001] This invention belongs to the technical field of mining machinery front shovel excavators, and particularly relates to a central pivot device for a mining machinery front shovel excavator. Background Technology

[0002] The central pivot assembly is a key component of a front shovel excavator, used to connect the excavator's upper and lower mechanisms. Specifically, the central pivot assembly connects the excavator's slewing platform and underframe. The lower part of the central pivot assembly is interference-fitted to the underframe, while the oil / gas rotary joint and high / low voltage slip rings are mounted on the upper part. During operation, the front shovel excavator rotates around the central pivot assembly and underframe.

[0003] In existing central pivot assemblies, the lower part of the central pivot assembly is interference-fitted to the excavator underframe, and the excavator's slewing platform rotates around the underframe and the central pivot assembly. Because the fixing nut is located above the platform, it experiences significant stress during excavator operation, making it prone to damage at the threads, thus posing a safety hazard. Furthermore, the interference-fit connection of the central pivot assembly to the excavator underframe in existing technologies hinders maintenance and repair; in case of damage, it must be destructively removed. Summary of the Invention

[0004] To address some or all of the technical problems existing in the prior art, the present invention provides a central pivot device for a mining machinery front shovel excavator. The central pivot device is installed between the excavator's slewing platform and the excavator's underframe. The central pivot device includes an upper bearing sleeve, a C-shaped retaining plate, a stop key, a central pivot, a slip ring tube, a spherical washer, a pivot nut, an anti-loosening key, a lower bearing sleeve, a first tie rod, and a second tie rod, wherein:

[0005] The upper part of the central pivot is fitted with the inner circumference of the center hole of the excavator's slewing platform with clearance. The lower part of the central pivot is disposed through the copper sleeve of the excavator's underframe and can rotate relative to the copper sleeve, and thus can rotate relative to the excavator's underframe. The C-shaped clamp and the stop key are fixed on the top of the excavator's slewing platform. The stop key is engaged in the C-shaped clamp and keyed to the outer wall of the central pivot. The central pivot is a hollow shaft. The upper bearing sleeve is nested in the inner circumference of the upper end of the central pivot and fixed to the central pivot by a connecting member. The lower bearing sleeve is nested in the inner circumference of the lower end of the central pivot and fixed to the central pivot by a connecting member.

[0006] The spherical washer, the pivot nut, and the anti-loosening key are installed inside the excavator underframe and located on the lower outer periphery of the central pivot to axially fix the central pivot.

[0007] The copper sleeve is lubricated by concentrated dry oil through the first lubrication channel, and the spherical washer is lubricated by concentrated dry oil through the second lubrication channel.

[0008] The slip ring tube is installed through the central pivot. An oil / air rotary joint and high and low voltage slip rings are installed on the upper part of the slip ring tube. Compressed air pipelines, lubricating grease pipelines, and cables leading to the lower mechanism of the excavator pass through the slip ring tube. The part of the slip ring tube that extends out of the lower end of the central pivot is fixed to the excavator underframe by the first tie rod and the second tie rod.

[0009] Furthermore, in the central pivot device of the aforementioned mining machinery front shovel excavator, the first tie rod is composed of a front cover and a rear cover, the first tie rod is connected to the slip ring tube, and the first tie rod is fixed to the second tie rod by a pin and a connecting member.

[0010] Furthermore, in the central pivot device of the aforementioned mining machinery front shovel excavator, the second tie rod consists of a fork head, a stud, and a nut. One end of the second tie rod is fixed to the first tie rod by a pin and a connecting piece, and the other end of the second tie rod is fixed to the excavator underframe by a pin and a connecting piece.

[0011] Furthermore, in the central pivot device of the aforementioned mining machinery front shovel excavator, a lifting screw is installed on the upper end face of the central pivot.

[0012] Furthermore, in the central pivot device of the aforementioned mining machinery front shovel excavator, the slip ring pipe is welded from a flange, a first pipe, a second pipe, and a third pipe. The flange is located on the upper end face of the second pipe, the first pipe is located on the upper outer periphery of the second pipe, and the third pipe is located on the lower outer periphery of the second pipe. The lower bottom surface of the flange is attached to the upper surface of the upper bearing sleeve, the first pipe is fitted to the inner periphery of the upper bearing sleeve, and the third pipe is fitted to the inner periphery of the lower bearing sleeve.

[0013] The central pivot device of the mining machinery front shovel excavator of the present invention has the following advantages and beneficial effects:

[0014] (1) The central pivot is fixed to the excavator slewing platform. The excavator slewing platform and the central pivot rotate together around the excavator underframe. The slip ring tube, which contains compressed air pipelines, lubricating grease pipelines, cables, etc., is installed inside the central pivot. It is rotatable relative to the excavator slewing platform, but not relative to the excavator underframe. Therefore, when the excavator slewing platform and the central pivot rotate together around the excavator underframe, the compressed air pipelines, lubricating grease pipelines, cables, etc. connected between the oil / air rotary joint and the high and low pressure slip rings and the lower mechanism will not rotate with the excavator slewing platform, thereby effectively avoiding kinking problems and eliminating safety hazards.

[0015] (2) The upper part of the central pivot device is assembled to the excavator's slewing platform through a C-type clamp, a stop key and corresponding connecting parts, and the lower part of the central pivot device is assembled to the excavator's underframe through a spherical washer, a pivot nut, an anti-loosening key, a first tie rod, a second tie rod and corresponding connecting parts. This ensures that the connection of the central pivot device is firm and reliable, preventing loosening during the operation of the mining machinery front shovel excavator, thus ensuring the normal operation of the mining machinery front shovel excavator and improving the service life of the central pivot device.

[0016] (3) The copper bushings of the excavator underframe and the spherical washers of the central pivot device are lubricated with dry oil, which ensures the smoothness and reliability of the excavator slewing platform and the central pivot rotating together around the excavator underframe.

[0017] (4) The upper part of the central pivot device is installed in the center hole of the excavator's slewing platform with clearance fit. The lower part of the central pivot device is installed in the copper sleeve of the excavator's underframe and can rotate relative to the copper sleeve. During maintenance, the central pivot can be easily and conveniently removed by disassembling the oil / gas rotary joint, high and low voltage slip rings, C-type clamping plate, stop key, spherical washer, pivot nut, anti-loosening key, first tie rod, and second tie rod. This facilitates maintenance, timely detection of defects in the central pivot, and avoidance of major safety accidents. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of a mining machinery front shovel excavator, in which the central pivot device of the mining machinery front shovel excavator of the present invention is used;

[0020] Figure 2 This is a front sectional view of the central pivot device of the mining machinery front shovel excavator of the present invention;

[0021] Figure 3 It is along Figure 2 View from direction A;

[0022] Figure 4 It is along Figure 2 View from direction B;

[0023] Figure 5 It is along Figure 4 Enlarged cross-sectional view of CC;

[0024] Figure 6 yes Figure 2 Enlarged view of section I;

[0025] Figure 7 This is a schematic diagram of the structure of the collector ring tube in the central pivot device of the mining machinery front shovel excavator of the present invention, wherein (b) is a view of (a) from direction D;

[0026] Figure 8 This is a schematic diagram of the structure of the first tie rod in the central pivot device of the mining machinery front shovel excavator of the present invention, wherein (b) is a cross-sectional view along EE in (a);

[0027] Figure 9 This is a schematic diagram of the structure of the second tie rod in the central pivot device of the mining machinery front shovel excavator of the present invention, wherein (b) is a top view of (a). Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0029] like Figure 1 As shown, the central pivot device 101 of the mining machinery front shovel excavator of the present invention is connected between the excavator slewing platform 103 and the excavator underframe 102, and the oil / gas rotary joint and high and low voltage collector rings 104 are installed on the upper part of the central pivot device 101.

[0030] like Figures 2 to 6As shown, the central pivot device 101 of the mining machinery front shovel excavator of the present invention includes an upper bearing sleeve 11, a C-shaped clamping plate 12, a stop key 13, a central pivot 14, a slip ring tube 15, a spherical washer 16, a pivot nut 17, an anti-loosening key 18, a lower bearing sleeve 19, a first tie rod 20, a second tie rod 21, a pin 22, a lifting screw 23, and a connecting piece 24.

[0031] The upper part of the central pivot device 101 is assembled to the excavator slewing platform 103 via a C-shaped clamping plate 12, a stop key 13, and corresponding connecting parts 24. The lower part of the central pivot device 101 is assembled to the excavator underframe 102 via a spherical washer 16, a pivot nut 17, an anti-loosening key 18, a first tie rod 20, a second tie rod 21, and corresponding connecting parts 24. Specifically, the upper part of the central pivot device 101 is installed in the center hole of the excavator slewing platform 103 with a clearance fit, and the lower part of the central pivot device 101 is installed in the copper sleeve 25 of the excavator underframe 102 and can rotate relative to the copper sleeve 25, and thus can rotate relative to the excavator underframe 102.

[0032] More specifically, the upper part of the central pivot 14 is fitted with the inner circumference of the center hole of the excavator slewing platform 103 with clearance. The lower part of the central pivot 14 is disposed through the copper sleeve 25 of the excavator underframe 102 and can rotate relative to the copper sleeve 25, and thus can rotate relative to the excavator underframe 102. The central pivot 14 is a hollow shaft. The upper bearing sleeve 11 is nested in the inner circumference of the upper end of the central pivot 14 and fixed to the central pivot 14 by the connecting member 24. The lower bearing sleeve 19 is nested in the inner circumference of the lower end of the central pivot 14 and fixed to the central pivot 14 by the connecting member 24. The C-shaped clamping plate 12 is welded to the top of the excavator slewing platform 103. The stop key 13 is fixed to the top of the excavator slewing platform 103 by the connecting member 24. The stop key 13 engages in the C-shaped clamping plate 12 and is keyed to the central pivot 103. The outer wall of 4 fixes the central pivot 14 to the excavator slewing platform 103, preventing the central pivot 14 from rotating relative to the excavator slewing platform 103. When the excavator slewing platform 103 rotates, the lower part of the central pivot 14 is disposed inside the copper sleeve 25 of the excavator underframe 102 and can rotate relative to the copper sleeve 25, thereby rotating relative to the excavator underframe 102. Therefore, the excavator slewing platform 103 and the central pivot 14 rotate together around the excavator underframe 102.

[0033] Furthermore, the spherical washer 16, the pivot nut 17, and the anti-loosening key 18 are installed inside the excavator underframe 102 and located on the lower outer periphery of the central pivot 14 to axially fix the central pivot 14. Thus, while ensuring that the excavator slewing platform 103 and the central pivot 14 rotate together around the excavator underframe 102, the central pivot 14 is prevented from moving up and down, thereby improving the working reliability of the excavator.

[0034] Furthermore, the copper bushing 25 of the excavator underframe 102 is centrally lubricated by dry oil through the first lubrication channel 26, and the spherical washer 16 of the central pivot device is centrally lubricated by dry oil through the second lubrication channel 27. This ensures the stability and reliability of the excavator slewing platform 103 and the central pivot 14 rotating together around the excavator underframe 102.

[0035] Furthermore, the collector ring tube 15 is installed through and within the central pivot 14. For example... Figure 7 As shown, the slip ring tube 15 is welded from a flange 150, a first tube 151, a second tube 152, and a third tube 153. The flange 150 is located on the upper end face of the second tube 152, the first tube 151 is located on the upper outer periphery of the second tube 152, and the third tube 153 is located on the lower outer periphery of the second tube 152. The lower bottom surface of the flange 150 is fitted to the upper surface of the upper bearing sleeve 11, the first tube 151 fits into the inner periphery of the upper bearing sleeve 11, and the third tube 153 fits into the inner periphery of the lower bearing sleeve 19. An oil / gas rotary joint and high / low voltage slip rings 104 (see [reference]) are installed on the upper part of the slip ring tube 15 through threaded holes circumferentially provided on the flange 150. Figure 1 The compressed air lines, lubricating grease lines, and cables leading to the excavator's lower structure all pass through the slip ring pipe 15. The portion of the slip ring pipe 15 extending out from the lower end of the central pivot 14 is fixed to the excavator underframe 102 via the first tie rod 20 and the second tie rod 21. Therefore, the slip ring pipe 15 is rotatable relative to the excavator's slewing platform 103, but not relative to the excavator underframe 102. Consequently, when the excavator's slewing platform 103 and the central pivot 14 rotate together around the excavator underframe 102, the compressed air lines, lubricating grease lines, and cables within the slip ring pipe 15 will not rotate with the excavator's slewing platform 103, preventing kinking.

[0036] Furthermore, such as Figure 8 As shown, the first pull rod 20 consists of a front cover 201 and a rear cover 202. The first pull rod 20 is connected to the slip ring tube 15, and the first pull rod 20 is fixed to the second pull rod 21 by a pin 22 and a connector 24.

[0037] Furthermore, such as Figure 9 As shown, the second tie rod 21 is composed of a fork head 211, a stud 212 and a nut 213. One end of the second tie rod 21 is fixed to the first tie rod 20 by a pin 22 and a connecting piece 24, and the other end of the second tie rod 21 is fixed to the excavator underframe 102 by a pin 22 and a connecting piece 24.

[0038] In addition, lifting screws 23 are installed on the upper end face of the central pivot 14 to facilitate the hoisting of the central pivot device during installation and disassembly.

[0039] In summary, compared with the prior art, the central pivot device of the mining machinery front shovel excavator of the present invention has the following advantages and beneficial effects:

[0040] (1) The central pivot is fixed to the excavator slewing platform. The excavator slewing platform and the central pivot rotate together around the excavator underframe. The slip ring tube, which contains compressed air pipelines, lubricating grease pipelines, cables, etc., is installed inside the central pivot. It is rotatable relative to the excavator slewing platform, but not relative to the excavator underframe. Therefore, when the excavator slewing platform and the central pivot rotate together around the excavator underframe, the compressed air pipelines, lubricating grease pipelines, cables, etc. connected between the oil / air rotary joint and the high and low pressure slip rings and the lower mechanism will not rotate with the excavator slewing platform, thereby effectively avoiding kinking problems and eliminating safety hazards.

[0041] (2) The upper part of the central pivot device is assembled to the excavator's slewing platform through a C-type clamp, a stop key and corresponding connecting parts, and the lower part of the central pivot device is assembled to the excavator's underframe through a spherical washer, a pivot nut, an anti-loosening key, a first tie rod, a second tie rod and corresponding connecting parts. This ensures that the connection of the central pivot device is firm and reliable, preventing loosening during the operation of the mining machinery front shovel excavator, thus ensuring the normal operation of the mining machinery front shovel excavator and improving the service life of the central pivot device.

[0042] (3) The copper bushings of the excavator underframe and the spherical washers of the central pivot device are lubricated with dry oil, which ensures the smoothness and reliability of the excavator slewing platform and the central pivot rotating together around the excavator underframe.

[0043] (4) The upper part of the central pivot device is installed in the center hole of the excavator's slewing platform with clearance fit. The lower part of the central pivot device is installed in the copper sleeve of the excavator's underframe and can rotate relative to the copper sleeve. During maintenance, the central pivot can be easily and conveniently removed by disassembling the oil / gas rotary joint, high and low voltage slip rings, C-type clamping plate, stop key, spherical washer, pivot nut, anti-loosening key, first tie rod, and second tie rod. This facilitates maintenance, timely detection of defects in the central pivot, and avoidance of major safety accidents.

[0044] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Meanwhile, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, the terms "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement states shown in the accompanying drawings.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A central pivot device for a mining machinery front shovel excavator, the central pivot device being installed between the excavator's slewing platform and the excavator's underframe, the central pivot device comprising an upper bearing sleeve, a C-shaped retaining plate, a stop key, a central pivot, a slip ring tube, a spherical washer, a pivot nut, an anti-loosening key, a lower bearing sleeve, a first tie rod, and a second tie rod, wherein: The upper part of the central pivot is fitted with the inner circumference of the center hole of the excavator's slewing platform with clearance. The lower part of the central pivot is disposed through the copper sleeve of the excavator's underframe and can rotate relative to the copper sleeve, and thus can rotate relative to the excavator's underframe. The C-shaped clamp and the stop key are fixed on the top of the excavator's slewing platform. The stop key is engaged in the C-shaped clamp and keyed to the outer wall of the central pivot. The central pivot is a hollow shaft. The upper bearing sleeve is nested in the inner circumference of the upper end of the central pivot and fixed to the central pivot by a connecting member. The lower bearing sleeve is nested in the inner circumference of the lower end of the central pivot and fixed to the central pivot by a connecting member. The spherical washer, the pivot nut, and the anti-loosening key are installed inside the excavator underframe and located on the lower outer periphery of the central pivot to axially fix the central pivot. The copper sleeve is lubricated by concentrated dry oil through the first lubrication channel, and the spherical washer is lubricated by concentrated dry oil through the second lubrication channel. The slip ring tube is installed through the central pivot. An oil / air rotary joint and high and low pressure slip rings are installed on the upper part of the slip ring tube. Compressed air pipelines, lubricating grease pipelines, and cables leading to the lower mechanism of the excavator pass through the slip ring tube. The part of the slip ring tube that extends out of the lower end of the central pivot is fixed to the excavator underframe by the first tie rod and the second tie rod. The first pull rod consists of a front cover and a rear cover. The first pull rod is connected to the slip ring tube, and the first pull rod is fixed to the second pull rod by a pin and a connector.

2. The central pivot device of the mining machinery front shovel excavator according to claim 1, characterized in that, The second tie rod consists of a fork, a stud, and a nut. One end of the second tie rod is fixed to the first tie rod by a pin and a connecting piece, and the other end of the second tie rod is fixed to the excavator underframe by a pin and a connecting piece.

3. The central pivot device of the mining machinery front shovel excavator according to claim 1, characterized in that, A lifting screw is installed on the upper end face of the central pivot.

4. The central pivot device of a mining machinery front shovel excavator according to any one of claims 1 to 3, characterized in that, The slip ring tube is welded from a flange, a first tube, a second tube, and a third tube. The flange is located on the upper end face of the second tube, the first tube is located on the upper outer periphery of the second tube, and the third tube is located on the lower outer periphery of the second tube. The bottom surface of the flange is attached to the upper surface of the upper bearing sleeve, the first tube is fitted to the inner periphery of the upper bearing sleeve, and the third tube is fitted to the inner periphery of the lower bearing sleeve.

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