CN111636499A - Rotation limiting system and excavator - Google Patents
Rotation limiting system and excavator Download PDFInfo
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- CN111636499A CN111636499A CN202010479487.1A CN202010479487A CN111636499A CN 111636499 A CN111636499 A CN 111636499A CN 202010479487 A CN202010479487 A CN 202010479487A CN 111636499 A CN111636499 A CN 111636499A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/30—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom
- E02F3/32—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom working downwardly and towards the machine, e.g. with backhoes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/2025—Particular purposes of control systems not otherwise provided for
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/2025—Particular purposes of control systems not otherwise provided for
- E02F9/2033—Limiting the movement of frames or implements, e.g. to avoid collision between implements and the cabin
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Component Parts Of Construction Machinery (AREA)
- Operation Control Of Excavators (AREA)
Abstract
The invention relates to a rotary limiting device and discloses a rotary limiting system which comprises a limiting mechanism arranged between an upper frame (1) and a lower frame (2), wherein the upper frame (1), a rotary support (3) and the lower frame (2) are sequentially and coaxially connected, and the limiting mechanism comprises two limiting switches (41) arranged on the lower surface of the upper frame (1) and a limiting plate (51) arranged on the upper surface of the lower frame (2); the two limit switches (41) are positioned on the same circumference with the rotation center of the upper frame (1) as the circle center, and inclined planes (511) inclined downwards are formed at two ends of each limit plate (51) respectively so as to relieve the impact on the limit switches (41). The invention also discloses an excavator. The rotation limiting system not only can accurately control the rotation angle, but also has longer service life.
Description
Technical Field
The invention relates to a rotation limiting device, in particular to a rotation limiting system, and further relates to an excavator.
Background
The hydraulic excavator is excavating equipment which is widely applied in building construction, and the management and the requirement of construction site factors on the hydraulic excavator are high; for example, in an actual construction site, a swing work may interfere with surrounding obstacles, thereby causing a safety accident.
The hydraulic excavator mainly comprises an upper frame, a lower frame, a working device, a slewing bearing and the like, wherein the working device is arranged on the upper frame through a pin shaft, the upper frame and the lower frame are connected through the slewing bearing, a slewing motor is connected with the upper frame, and the upper frame is driven to rotate through the rotation of the slewing motor, so that the excavating operation of the working device at different angles is realized.
The rotation of the rotary motor can realize 360-degree rotary operation of the working device, but the rotary motor cannot accurately realize rotary motion within a specific angle, for example, an agricultural excavator needs to meet the requirement of excavating operation within a rotary angle of less than 270 degrees; at present, the gyration region is adjusted through gyration stop device to current slewing equipment, because gyration stop device confirms the gyration position through the mode of collision in the use, but, is difficult to realize accurate control to the gyration angle, moreover, leads to gyration stop device life relatively short.
Therefore, there is a need to design a new type of rotation limiting system to overcome or alleviate the above technical problems.
Disclosure of Invention
The invention aims to provide a rotation limiting system, which not only can accurately control the rotation angle, but also has longer service life.
A further object of the present invention is to provide an excavator which is capable of accurately controlling a swing angle.
In order to achieve the above object, a first aspect of the present invention provides a rotation limiting system, including a limiting mechanism installed between an upper frame and a lower frame, wherein the upper frame, a rotation support and the lower frame are coaxially connected in sequence, and the limiting mechanism includes two limiting switches installed on a lower surface of the upper frame and a limiting plate installed on an upper surface of the lower frame; the two limit switches are positioned on the same circumference with the rotation center of the upper frame as the circle center, and two ends of the limit plate are respectively provided with an inclined plane which inclines downwards.
Preferably, the included angle between the inclined plane and the horizontal plane is greater than 0 degrees and not less than 30 degrees.
Specifically, the limit switch is connected with a fixed seat through a transition plate, and the fixed seat is fixedly arranged on the lower surface of the upper frame; the limiting plate is connected with the mounting seat, and the mounting seat is fixedly mounted on the upper surface of the lower frame.
Furthermore, the limit switch is detachably mounted on the transition plate, and the transition plate is detachably connected with the fixed seat; the limiting plate is detachably mounted on the mounting seat.
Furthermore, the limit switch is connected with the transition plate through a bolt, the transition plate is connected with the fixed seat through a bolt, and a limit switch fixing nut and a transition plate fixing nut are fixedly connected to the transition plate.
Preferably, the limit switch is provided with a touch piece.
More preferably, the swing control device further includes a swing pilot oil passage in which a solenoid valve for controlling a swing operation is provided.
Furthermore, the rotary pilot oil path comprises a left rotary pilot oil path and a right rotary pilot oil path, and the left rotary pilot oil path and the right rotary pilot oil path are respectively provided with an electromagnetic valve; when the touch piece rotates to a set angle, the electromagnetic valve on the left rotary pilot oil way or the right rotary pilot oil way is controlled to reverse through the controller, so that the upper frame stops rotating along the original direction, and the rotation angle is accurately controlled
More preferably, the running length of the working surface of the limiting plate is not less than 2 times of the sliding stroke of the touch piece on the limiting plate; wherein, the sliding stroke is ω · T · R, where ω is a rotation angular velocity, T is a time elapsed from when the limit switch sends a level signal to when the rotation stops, and R is a distance between the touch member and a rotation center. A second aspect of the present invention provides an excavator, comprising a swing limiting system according to any one of the above technical aspects.
Through the technical scheme, the invention has the following beneficial effects:
in the basic technical scheme of the invention, the limiting mechanism is arranged between the upper frame and the lower frame, so that the rotation angle can be accurately controlled, and the rotation limiting at different angles can be realized; specifically, go up and be provided with two limit switch on the frame, be provided with the limiting plate on the frame down, two limit switch can form a sector region with the centre of gyration of last frame, cooperation through limit switch and limiting plate, thereby the frame is rotated for lower frame at the within range that is less than 360 for the control, satisfy the special gyration angle requirement of mechanical equipment, and, the both ends of limiting plate all have the inclined plane of one section downward sloping, at the in-process that limit switch touched the limiting plate, can contact the extrusion gradually, alleviate the collision and strike, make stop gear have longer life.
Furthermore, the running length of the working surface of the limiting plate is designed to be not less than 2 times of the sliding stroke of the touch piece on the limiting plate, so that the effectiveness of rotation braking in two directions can be guaranteed, and the rotation angle of the upper frame due to inertia effect is also considered, so that the rotation angle can be controlled more accurately.
In addition, the transition plate is fixedly connected with the limit switch fixing nut and the transition plate fixing nut, so that the problem that the gap between the transition plate and the slewing bearing is too small to cause difficulty in assembly can be avoided, and the assembly efficiency is improved.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
FIG. 1 is one of the schematic structural diagrams of a prior art hydraulic excavator;
FIG. 2 is a second schematic structural view of a prior art hydraulic excavator;
FIG. 3 is one of the schematic layouts of a limit switch according to an embodiment of the present invention;
FIG. 4 is a second schematic layout diagram of a limit switch according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a limit switch and limit plate collision process according to an embodiment of the invention;
fig. 6 is one of the schematic structural diagrams of the limiting plate according to the embodiment of the invention;
FIG. 7 is a second schematic diagram of a second embodiment of a retainer plate according to the present invention;
FIG. 8 is a block diagram illustrating hydraulic control of the swing operation according to the exemplary embodiment of the present invention;
fig. 9 is a schematic structural view of a transition plate according to an embodiment of the present invention.
Description of the reference numerals
1 upper frame and 2 lower frame
3 slewing bearing 41 limit switch
411 limit switch fixing nut 412 touch piece
42 transition plate 421 transition plate fixing nut
43 fixed plate 51 limit plate
511 ramp 52 mount
6 working device 7 rotary motor
L slip over travel omega rotation angular velocity
Phi set angle
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; either directly or indirectly through intervening media, either internally or in any combination thereof. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
First, it should be noted that for the convenience of describing the present invention and simplifying the description, the directional terms "left", "right", "rear" are substantially the same as the front-back, left-right direction of the excavator, for example, the left swing is a swing pointing to the left direction of the excavator; the directional terms for the swing limiting system of the present invention should be understood in conjunction with the actual installation conditions.
As shown in fig. 3 to 5, the rotation limiting system according to the basic embodiment of the present invention includes a limiting mechanism installed between an upper frame 1 and a lower frame 2, the upper frame 1, a rotation support 3 and the lower frame 2 are coaxially connected in sequence, the limiting mechanism includes two limiting switches 41 installed on a lower surface of the upper frame 1 and a limiting plate 51 installed on an upper surface of the lower frame 2; the two limit switches 41 are located on the same circumference with the rotation center of the upper frame 1 as the center of circle, and inclined planes 511 inclined downward are respectively formed at the two ends of the limit plate 51 to relieve the impact on the limit switches 41.
Referring to fig. 1 and 2, a conventional hydraulic excavator mainly includes an upper frame 1, a lower frame 2, a working device 6, a slewing bearing 3, and the like, wherein the working device 6 is connected to the upper frame 1 through a pin shaft, an inner ring of the slewing bearing 3 is connected to the lower frame 2, an outer ring of the slewing bearing 3 is connected to the upper frame 1, a slewing motor 7 is mounted on the upper frame 1 and engaged with the inner ring of the slewing bearing 3, and the slewing motor 7 rotates to drive the upper frame 1 to slew, so that the slewing operation of the working device 6 in a 360 ° range can be realized, but the rotation operation in a specific angle cannot be realized accurately, and if an agricultural excavator needs to meet the excavating operation with a slewing angle smaller than 270 °.
In the basic technical scheme of the invention, the lower surface of the upper frame 1 is provided with two limit switches 41, meanwhile, the upper surface of the lower frame 2 is provided with a limit plate 51, as the two limit switches 41 are arranged on the circumference taking the rotation center of the upper frame 1 as the circle center, a sector area is formed, and the rotation angle is accurately controlled by setting the center angle of the sector area and matching the limit switches 41 with the limit plate 51, so that the rotation motion of the equipment within a specific angle is met; further, the inclined surfaces 511 inclined downward are provided at both ends of the limit plate 51, so that the collision impact between the limit switch 41 and the limit plate 51 can be alleviated, and the service life of the limit switch 41 can be prolonged.
Further, referring to fig. 5 and 8, the lower portion of the limit switch 41 is provided with a touch member 412, when the swing motor 7 drives the upper frame 1 to swing, the limit switch 41 is driven to swing, so that the touch member 412 first swings to a position just contacting with the inclined surface 511 on the limit plate 51, and then continues to swing, and as the touch member 412 touches the limit plate 51, the touch member 412 rotates around a position connected with the lower portion of the limit switch 41; referring to fig. 7, when the touch member 412 rotates to a set angle phi, a signal output threshold is reached, the limit switch 41 outputs a level signal to the controller, the controller outputs a high level driving signal to drive the solenoid valve to act, and a rotary pilot oil path in a corresponding rotary direction is cut off, so that the upper frame 1 stops rotating, and meanwhile, the rotary motion in the opposite direction can still be realized, referring to fig. 4, because two limit switches 41 are arranged on a circumference with the rotary center of the upper frame 1 as a circle center, a sector area is formed, and the central angle of the sector area is theta, so that the rotation in a range of (360-theta) can be realized. The touch member 412 may be an existing striker or a probe. In addition, in actual assembly, referring to fig. 5, in order to ensure the effectiveness of the contact between the limit switch 41 and the limit plate 51, a certain gap is provided between the working surface of the limit plate 51 and the main body of the limit switch 41, and the gap enables the touching member 412 to be in a state of being deflected by a certain angle when contacting with the working surface of the limit plate 51, for example, fig. 5 shows a state of deflecting the touching member 412 by an angle Φ.
The inclined plane 511 of the limit plate 51 is a plate surface inclined at a small angle, and the included angle α between the inclined plane and the horizontal plane is greater than 0 ° and not less than 30 °, so as to mitigate the impact of collision between the limit switch 41 and the limit plate 51, and effectively prolong the service life of the limit switch 41.
Chinese patent 201720058188.4 discloses a tower machine gyration stop device, specifically, the same first limit switch and the same second limit switch of structure are installed to the lower apron of upper bracket in the position that the jib loading boom direction corresponds, the center of support is on the same circumference of centre of a circle above first limit switch and the second is spacing to be located, the same first limiting plate of structure and second limiting plate are installed in barrier sector area to the upper apron of lower support, first limiting plate and second limiting plate are located the same circumference of centre of a circle at the center of support below the first limiting plate and second limiting plate, all be equipped with the touching pole on first limit switch and the second limit switch, when touching pole touches first limiting plate and second limiting plate, can transmit the signal to the switch controller, send the signal by the switch controller again to control mechanism, in order to take corresponding control measure.
In the above prior art, although the first limit switch, the second limit switch, the first limit plate, the second limit plate and the like are arranged, the control of the rotation angle can be realized; however, since the influence of the braking distance is not taken into consideration, the turning angle cannot be accurately controlled.
In addition, the turning motion is generally controlled manually, for example, the turning motion is operated by a control handle, but the control handle is often reset to the middle position after a certain time of warning due to the reaction time of people; taking left rotation as an example, the control handle is operated by the hand in the left rotation direction, and the system sends out a warning after reaching a predetermined position, so that the control handle is continuously located at the left rotation operation position due to the reaction time, the rotation action is continuously kept to the left, an expected result is not achieved, and the rotation effectiveness cannot be guaranteed.
However, in the embodiment of the present invention, referring to fig. 7 and 8, since there is a certain braking distance from the time when the level signal is sent from the limit switch 41 to cut off the rotation pilot oil path until the rotation movement is completely stopped due to inertia, the sliding stroke L of the touch member 412 of the limit switch 41 on the limit plate 51 may be approximated to L ═ ω · T · R, where ω is the rotation angular velocity, T is the time elapsed until the rotation is stopped after the level signal is sent from the limit switch 41, and R is the distance between the touch member 412 and the rotation center.
Since the touching member 412 slides on the upper surface of the position limiting plate 51, the upper surface of the position limiting plate 51 can be defined as a working surface; in order to guarantee the rotation braking in the left and right directions, referring to fig. 5 to 7, the length of the working surface of the limiting plate 51 is not less than 2 times of the sliding stroke L of the touching piece 412 on the limiting plate 51, and the rotation angle can be controlled more accurately by considering the rotation angle of the upper frame 1 due to the inertia effect; moreover, when the touch piece 412 rotates to the set angle phi, the controller drives the electromagnetic valve to act, and cuts off the rotary pilot oil path in the corresponding rotary direction, so that the influence of human reaction time is eliminated, and the effectiveness of rotary braking is ensured. The "run length" can be understood as follows: a dimension of the limit plate 51 between the level signal emission positions of the limit switches 41 on the left and right sides, parallel to the direction in which the touching piece 412 slides on the upper surface of the limit plate 51; the overall shape of the stopper plate 51 is not limited to the bent straight plate shape shown in fig. 6, and may be an arc shape, and the inclined surface 511 may be deformed into an arc curved surface.
Fig. 8 shows an embodiment of controlling the swing through a swing pilot oil path, and referring to fig. 7, when the touch member 412 rotates to a set angle phi, a signal output threshold is reached, the limit switch 41 outputs a level signal to the controller, the controller outputs a high level driving signal to drive one solenoid valve to act, and the corresponding swing pilot oil path is cut off, so that the upper frame 1 stops rotating in the current direction, and at the same time, the other solenoid valve is not affected, and the reverse swing motion can still be realized; for example, one solenoid valve is driven to act, a left rotary pilot oil path is cut off, so that the upper frame 1 stops rotating leftwards, and the right rotary pilot oil path can still drive the rotary valve core to be in the right position because the other solenoid valve does not act, so that the upper frame 1 can rotate rightwards; and vice versa.
The electromagnetic valve is preferably a two-position three-way electromagnetic reversing valve, and the two-position three-way electromagnetic reversing valve is arranged on the left rotary pilot oil path and the right rotary pilot oil path respectively; or, the left rotary pilot oil path and the right rotary pilot oil path may be connected to the same solenoid valve, and the solenoid valve is preferably a three-position four-way electromagnetic directional valve; the controller can be an existing programmable controller, such as a PLC, and controls the action of the electromagnetic valve through a program, so as to control the rotation direction and the angle of the upper frame 1.
It should be noted that, as far as the related hydraulic components are well known to those skilled in the art and are common components in the existing hydraulic system, those skilled in the art can also perform simple replacement after knowing the technical idea of the present invention, so as to realize the function of the rotary pilot oil circuit of the present invention, and this also belongs to the protection scope of the present invention.
Moreover, in the rotation limiting system of the invention, the design of two limit switches 41 and one limit plate 51 is adopted, so that the number of parts is reduced, and the whole arrangement is simpler.
As a specific embodiment of the limit mechanism, as shown in fig. 3 and 4, the limit switch 41 is connected with a fixed seat 43 via a transition plate 42, and the fixed seat 43 is fixedly installed on the lower surface of the upper frame 1; the stopper plate 51 is connected to the mounting seat 52, and the mounting seat 52 is fixedly mounted on the upper surface of the lower frame 2. Thus, as the upper frame 1 rotates, the fixed seat 43 drives the limit switch 41 to rotate through the transition plate 42, and the rotation of the upper frame 1 within a specific angle is realized through the interaction between the limit switch 41 and the limit plate 51. In the specific embodiment, the limit plate 51 is installed right behind the lower frame 2, and the two limit switches 41 are installed right in front of the upper frame 1 and are symmetrically arranged.
Further, in order to realize switching between the functions of rotation within a specific angle and rotation within a 360-degree angle range, the limit switch 41 is detachably mounted on the transition plate 42, and the transition plate 42 is detachably connected with the fixed seat 43; the limiting plate 51 is detachably mounted on the mounting seat 52; the fixing base 43 is riveted or welded to the lower surface of the upper frame 1, and the mounting base 52 is riveted or welded to the upper surface of the lower frame 2. The detachable connection can be realized by various connection modes, such as threaded connection, pin connection, bolt connection and the like. For example, fig. 3 shows an embodiment using a bolt connection, so that the transition plate 42, the limit switch 41, and the limit plate 51 can be easily removed for reuse, the upper frame 1 and the lower frame 2 respectively leave the fixing seat 43 and the mounting seat 52 with smaller volume, the appearance of the whole machine is not affected, and after the limit mechanism is removed, the 360-degree rotation function can be conveniently realized.
Furthermore, as shown in fig. 9, the limit switch fixing nut 411 and the transition plate fixing nut 421 may be welded to the transition plate 42, so that the transition plate 42 may be conveniently connected to the fixing seat 43 from the outside through a bolt, the difficulty in assembly due to an excessively small gap between the transition plate 42 and the slewing bearing 3 may be avoided, and the assembly efficiency of the limit switch 41 may be improved. Furthermore, the transition plate 42 may also be installed on the side of the fixing seat 43 away from the slewing bearing 3, and the functions of fixing the transition plate 42 and the limit switch 41 may also be achieved.
As shown in fig. 3 to 9, the rotation limiting system according to the preferred embodiment of the present invention includes a limiting mechanism and a rotation pilot oil path installed between an upper frame 1 and a lower frame 2, the upper frame 1, a rotation support 3 and the lower frame 2 are coaxially connected in sequence, the limiting mechanism includes a limiting switch 41 passing through a transition plate 42, a fixing seat 43, a limiting plate 51 and a mounting seat 52; the fixing seat 43 is welded on the lower surface of the upper frame 1, the mounting seat 52 is welded on the upper surface of the lower frame 2, the transition plate 42 is in bolted connection with the fixing seat 43, the limit switch 41 is in bolted connection with the transition plate 42, and the limit plate 51 is in bolted connection with the mounting seat 52, so that the transition plate 42, the limit switch 41 and the limit plate 51 can be conveniently detached and reused, and the fixing seat 43 and the mounting seat 52 with smaller volumes are respectively left on the upper frame 1 and the lower frame 2, so that the attractiveness of the whole machine is not influenced, and after the limit mechanism is detached, the 360-degree rotation function can be conveniently realized; in addition, the limit switch fixing nut 411 and the transition plate fixing nut 421 are welded on the transition plate 42, so that the difficulty in assembly caused by the excessively small gap between the transition plate 42 and the slewing bearing 3 is avoided, and the assembly efficiency of the limit switch 41 can be improved; wherein, two limit switches 41 are positioned on the same circumference with the rotation center of the frame 1 as the center of circle to form a sector area, the central angle of the sector area is theta, two ends of the limit plate 51 are respectively formed with an inclined plane 511 which inclines downwards, and the inclined plane 511 and the horizontal plane have a small angle; the rotary pilot oil path is divided into a left rotary pilot oil path and a right rotary pilot oil path, the left rotary pilot oil path and the right rotary pilot oil path are respectively provided with an electromagnetic valve, and the electromagnetic valve is preferably a two-position three-way electromagnetic directional valve; in the rotation process, the touch piece 412 on the limit switch 41 is firstly contacted with the inclined plane 511, when the touch piece 412 rotates for a set angle phi under the action of the limit plate 51, a signal output threshold value is reached, the limit switch 41 outputs a level signal to the controller, the controller outputs a high level driving signal to drive a two-position three-way electromagnetic directional valve to act, a corresponding rotation pilot oil path is cut off, the upper frame 1 stops rotating along the current direction, at the moment, the other two-position three-way electromagnetic directional valve does not act, and the reverse rotation motion can still be realized, so that the rotation within a specific angle range is realized; in addition, during normal action, the oil circuit of the electromagnetic valve is normally open, and the rotation action is normal; when the rotary limiting state is achieved, the electromagnetic valve is reversed, and the corresponding rotary pilot oil way is cut off.
According to the preferred technical scheme, the two limit switches 41 are arranged on the same circumference with the rotation center of the frame 1 as the circle center, and are matched with the limit plate 51, so that the rotation action in a specific angle can be realized, the arrangement positions of the two limit switches are changed, and the rotation limit in different angles can be realized; the limit switch 41 is connected with the limit plate 51 by bolts, so that the assembly is convenient when the limit function is needed, the disassembly and the repeated use are convenient when the limit function is not needed, and the appearance of the whole machine is not influenced; the limiting plate 51 adopts the design of the small-angle inclined surface 511 and the running length of the working surface thereof, so that the collision impact with the limiting switch 41 can be alleviated, the service life of the limiting switch 41 is prolonged, and the effectiveness of rotary braking is ensured; 2 electromagnetic valves are arranged in the rotary pilot circuit, so that independent control of left rotation and right rotation can be realized, and the control effectiveness is ensured.
The rotation limiting system can be adapted to a common excavator, so that the excavator can accurately control the rotation angle and realize the rotation motion of a specific angle.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the individual specific technical features in any suitable way. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (10)
1. A rotation limiting system is characterized by comprising a limiting mechanism arranged between an upper frame (1) and a lower frame (2), wherein the upper frame (1), a rotary support (3) and the lower frame (2) are sequentially and coaxially connected, and the limiting mechanism comprises two limiting switches (41) arranged on the lower surface of the upper frame (1) and a limiting plate (51) arranged on the upper surface of the lower frame (2); the two limit switches (41) are positioned on the same circumference with the rotation center of the upper frame (1) as the circle center, and inclined planes (511) inclined downwards are formed at two ends of each limit plate (51) respectively so as to relieve the impact on the limit switches (41).
2. The slewing limit system according to claim 1, wherein the angle of the ramp (511) to the horizontal is greater than 0 ° and not less than 30 °.
3. The swing limit system according to claim 1, wherein the limit switch (41) is connected with a fixed seat (43) via a transition plate (42), the fixed seat (43) being fixedly mounted to a lower surface of the upper frame (1); the limiting plate (51) is connected with the mounting seat (52), and the mounting seat (52) is fixedly mounted on the upper surface of the lower frame (2).
4. The swing limit system according to claim 3, wherein the limit switch (41) is detachably mounted on the transition plate (42), and the transition plate (42) is detachably connected with the fixed seat (43); the limiting plate (51) is detachably mounted on the mounting seat (52).
5. The swing limit system according to claim 4, wherein the limit switch (41) is bolted to the transition plate (42), the transition plate (42) is bolted to the fixed seat (43), and a limit switch fixing nut (411) and a transition plate fixing nut (421) are fixedly connected to the transition plate (42).
6. Swivel limit system according to any one of claims 1 to 5, characterized in that a touch (412) is provided on the limit switch (41).
7. The swing limit system according to claim 6, further comprising a swing pilot oil passage in which a solenoid valve for controlling a swing action is provided.
8. The swing limit system according to claim 7, wherein the swing pilot oil path comprises a left swing pilot oil path and a right swing pilot oil path, and the left swing pilot oil path and the right swing pilot oil path are respectively provided with an electromagnetic valve; when the touch piece (412) rotates to a set angle (phi), the electromagnetic valve on the left rotation pilot oil path or the right rotation pilot oil path is controlled to change direction through the controller, so that the upper frame (1) stops rotating along the original direction, and the rotation angle can be accurately controlled.
9. The pivoting limit system according to claim 6, characterized in that the length of the running surface of the limit plate (51) is not less than 2 times the travel (L) of the sliding of the feeler (412) on the limit plate (51);
wherein, the sliding stroke (L) is omega T R, in the formula, omega is the rotation angular speed, T is the time that the limit switch (41) sends a level signal until the rotation stops, and R is the distance between the touch piece (412) and the rotation center.
10. An excavator comprising a slewing limit system as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010479487.1A CN111636499A (en) | 2020-05-29 | 2020-05-29 | Rotation limiting system and excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010479487.1A CN111636499A (en) | 2020-05-29 | 2020-05-29 | Rotation limiting system and excavator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111636499A true CN111636499A (en) | 2020-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010479487.1A Pending CN111636499A (en) | 2020-05-29 | 2020-05-29 | Rotation limiting system and excavator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111945816A (en) * | 2020-09-15 | 2020-11-17 | 三一重机有限公司 | Limiting device and excavator |
| CN112922071A (en) * | 2021-01-28 | 2021-06-08 | 三一重机有限公司 | Rotation mechanism limiting system and operation machine |
| CN113235690A (en) * | 2021-05-28 | 2021-08-10 | 三一重机有限公司 | Gyration stop device, gyration subassembly and operation machinery |
| CN115140670A (en) * | 2022-06-24 | 2022-10-04 | 长沙智能专用车研究院有限公司 | Limiting device of slewing mechanism and mechanical equipment thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111945816A (en) * | 2020-09-15 | 2020-11-17 | 三一重机有限公司 | Limiting device and excavator |
| CN112922071A (en) * | 2021-01-28 | 2021-06-08 | 三一重机有限公司 | Rotation mechanism limiting system and operation machine |
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| CN113235690B (en) * | 2021-05-28 | 2023-01-10 | 三一重机有限公司 | Gyration stop device, gyration subassembly and operation machinery |
| CN115140670A (en) * | 2022-06-24 | 2022-10-04 | 长沙智能专用车研究院有限公司 | Limiting device of slewing mechanism and mechanical equipment thereof |
| CN115140670B (en) * | 2022-06-24 | 2024-03-22 | 长沙智能专用车研究院有限公司 | Limiting device of slewing mechanism, slewing mechanism and mechanical equipment |
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Application publication date: 20200908 |