Roller limiter with adjustable measuring range

Abstract

Roller limiter with adjustable measuring range, characterized in that the roller limiter with adjustable measuring range comprises: a support element (1); a roller (2) rotatably mounted at one end of the support member (1); a closed reduction gear (4) meshingly connected to an axial end of the roller (2) via a closed drive gear (3); a limiting element (5) provided on the gear shaft at the end of the closed reduction gear (4), wherein a microswitch (6) is provided at an end of the limiting element (5) facing away from the closed reduction gear (4); wherein in the initial state the limiting element (5) has no contact with the microswitch (6), wherein when the roller (2) rotates the closed drive gear (3) and the closed reduction gear (4) are driven to rotate about their own axis so that the end of the limiting element (5) is brought into contact with the microswitch (6), thereby triggering the output of a control signal.

Description

TECHNICAL FIELDThe present application relates to the technical field of the limiter and, more particularly, to a roller limiter with adjustable measurement range.PRIOR ARTLimiters, also called overload limiters, can be set such that a mechanism remains on a movement path and does not exceed a specific position. When the movement of the mechanism reaches or exceeds the set position, the restrictor sends a signal or takes certain control action to stop the movement or change the direction of movement, thereby preventing the mechanism from exceeding its range of movement to avoid accidental damage or danger.In the vicinity of clad cranes for pits, the commonly used restrictor is a firestop restrictor having a threaded rod drive structure. Its functional principle consists in that the threaded rod, when the device has to be moved, transmits a force to the limiter body by rotation. As the threaded rod rotates, the push / pull rod (or action rod) performs a corresponding linear movement. When the push / pull rod (or action rod) moves to the preset position, it triggers contact in the limiter body for action. The action of the contact breaks the circuit, thereby breaking the main power supply and implementing the limiting function.However, the manner in which a slider and a threaded rod in the threaded rod drive transmit force through surface contact can easily result in the slider being rapidly worn, causing the slider to quickly fail or stick, resulting in frequent failures of the limiter.CONTENT OF THE PRESENT APPLICATIONTo solve or partially solve the problems existing in the related art, the present application provides a variable range roller limiter.In order to achieve the above objects, the present application is implemented by the following technical solutions:An adjustable measurement range roller limiter, the adjustable measurement range roller limiter comprising:a support member;a roller rotatably mounted on an end of the support member;a closed reduction gear meshingly connected to an axial end of the roller via a closed drive gear;a limiting element provided on the gear shaft at the end of the closed reduction gear, wherein a microswitch is provided accordingly at an end of the limiting element remote from the closed reduction gear;wherein, in the initial state, the limiting element is not in contact with the microswitch, wherein, when the roller rotates, the closed driving gear and the closed reduction gear are driven to rotate about their own axis, so that the end of the limiting element is brought into abutment with the microswitch, thereby triggering the output of a control signal.Alternatively, it is provided that the closed reduction gear comprises the following:a first closed double layer gear meshingly connected with the closed drive gear, the side of the first closed double layer gear facing away from the closed drive gear being meshingly connected with a second closed double layer gear, the side of the second closed double layer gear facing away from the first closed double layer gear being meshingly connected with a third closed double layer gear, the side of the third closed double layer gear facing away from the second closed double layer gear being meshingly connected with a fourth closed double layer gear.Alternatively, it is provided that the delimiting element comprises the following:an upper limit pointer and a lower limit pointer mounted on the transmission shaft of the fourth closed double layer gear;wherein at an end of the upper limit pointer and of the lower limit pointer facing away from the fourth closed double-layer gear, an arc-shaped stop is provided in each case.Alternatively, it is provided that the microswitch comprises an upper limit microswitch and a lower limit microswitch;wherein a changeover tab is provided at an end of the upper limit microswitch or of the lower limit microswitch facing the fourth closed double-layer gearwheel, and a curved plate is provided at an end of the changeover tab.Alternatively, it is arranged that the fourth closed double layer gear is provided with four arc-shaped adjusting grooves, and a middle part of the upper limit pointer and the lower limit pointer is respectively fixed with a bolt in two of the arc-shaped adjusting grooves.Alternatively, it is provided that the support element comprises the following:a base and a bracket disposed at the upper end of the base, wherein a spring is disposed between the bracket and the base;wherein the roller is mounted on an end of the holder facing away from the base.Alternatively, it is provided that a gear is provided on the side surface of an end of the bracket facing away from the base, and the closed drive gear, the closed reduction gear, and the micro switch are all mounted in the gear.Alternatively, it is provided that the closed drive wheel and the closed reduction gear are both embodied as straight-toothed gears.Alternatively, it is provided that the holder has a curvature.Alternatively, it is provided that a waist-shaped hole is provided on the holder.Advantageous effects of the present application: The present application uses a roller limiter consisting of a support member, a roller, a closed drive gear, a closed reduction gear, a limiting member and a microswitch to replace the conventional fire-cut limiter, wherein the gear train consisting of the closed drive gear and the closed reduction gear set replaces the conventional threaded rod train, and the closed drive gear and the closed reduction gear transmit the force through line contact, whereby the wear can be effectively reduced; at the same time, by using a closed gear, dust, contaminants or the like can be effectively prevented from entering from the outside and causing friction; moreover, the closed gear train can completely lubricate the gear, whereby friction and wear between the gears are further reduced. In this way, the speed of transmission errors or disturbances is effectively slowed down and thus a frequent failure of the limiter is avoided.It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application.BRIEF DESCRIPTION OF THE DRAWINGSThe above and other objects, features and advantages of the present application will become more apparent from a more detailed description of the exemplary embodiments of the present application taken in conjunction with the accompanying drawings, wherein like reference numerals represent like components in principle in the exemplary embodiments of the present application. FIG. 1 is a diagram from a first angle of view of a variable range roller limiter shown in a first embodiment of the present application; FIG. 2 is a schematic structural diagram of a closed reduction gear shown in an embodiment of the present application; FIG. 3 is an enlarged partial view of a variable range roller limiter shown in a first embodiment of the present application; FIG. 4 is a schematic structural diagram of a limiting member of a variable measurement range roller limiter shown in an embodiment of the present application; FIG. 5 is a diagram from a first angle of view of a variable range roller limiter shown in a first embodiment of the present application.Reference numeral: 1 support member, 2 reel, 3 closed drive gear, 4 closed reduction gear, 5 restriction member, 6 micro switch, 7 first closed double layer gear, 8 second closed double layer gear, 9 third closed double layer gear, 10 fourth closed double layer gear, 11 upper limit pointer, 12 lower limit pointer, 13 arc stopper, 14 upper limit micro switch, 15 lower limit micro switch, 16 changeover tab, 17 arc plate, 18 arc adjusting groove, 19 screw, 20 base, 21 bracket, 22 spring, 23 gear, 24 waist-shaped hole, 25 steel cord drum.DETAILED DESCRIPTIONIn describing the present application, it is to be noted that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "before", "after", "left", "right", "vertical", "horizontal", "roof", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are the shown orientations or positional relationships based on the drawings, and are for convenience of description of the present application and convenience of description only, rather than indicating or implying, said device or element having a particular orientation or orientation or having to be constructed and operated in a particular orientation and should therefore not be construed as limiting the present application.Moreover, the terms "first" and "second" are used for descriptive purposes only and cannot be understood to indicate or imply a relative meaning or implicitly specify the set of technical features stated. Thus, features defined as "first" and "second" may include at least one of these features explicitly or implicitly. In the specification of the present application, "plural" means at least two, such as two, three or the like, unless specifically defined otherwise.It should be noted in the present application that unless otherwise stated and limited, the terms "installation", "connection", "attachment", or the like are to be broadly understood, for example, it may be a fixed connection or a detachable connection or integral connection; it may be a mechanical or electrical connection; it may be a direct connection or an indirect connection via an interposed medium; and it may be an internal communication of two elements or an inter-relationship of two elements, unless otherwise clearly defined. Those skilled in the art can understand the specific meanings of the above terms in the present application according to specific situations.In the present application, a first feature that is "on" or "under" a second feature may be that the first feature is in direct contact with the second feature or the first feature and the second feature are in indirect contact through an interposed medium, unless otherwise clearly indicated and limited. Moreover, the first feature that lies "over", "on", and "above" the second feature may mean that the first feature lies directly over or obliquely over the second feature, or simply mean that the first feature has a higher plane than the second feature. The first feature being "below," "below," and "down" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a smaller plane than the second feature.In the present application, the terms "an embodiment", "some embodiments", "example", "specific examples" or "some examples" or the like mean terms that specific features, structures, materials or specifics described in connection with the embodiment or the example are included in at least one embodiment or an example of the present application. In this specification, the schematic diagrams of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, those skilled in the art can combine and combine various embodiments or examples and features of various embodiments or examples described in this specification without conflict with each other.Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, substitutions, and modifications to the above-mentioned embodiments within the scope of the present application.The above-mentioned statements are merely optional embodiments of the present application and are not intended to limit the present application. All modifications, equivalents, improvements, and the like made in the sense and principles of the present application should be included within the scope of the present application.In order to make the purpose, the technical solutions and the advantageous effects of the present application clearer, the preferred embodiments of the present application will be described in detail below in conjunction with the accompanying drawings in order to facilitate understanding by technical personnel.First Embodiment:Referring to FIGS. 1 and 2, an adjustable measurement range roller limiter is illustrated, the adjustable measurement range roller limiter comprising:a support member 1;a roller 2 rotatably mounted on one end of the support member 1;a closed reduction gear 4 meshingly connected to an axial end of the reel 2 via a closed drive gear 3;a limiting element 5, which is provided on the gear shaft at the end of the closed reduction gear 4, wherein a microswitch 6 is correspondingly provided at an end of the limiting element 5 remote from the closed reduction gear 4;wherein, in the initial state, the limiting element 5 is not in contact with the microswitch 6, wherein, when the reel 2 rotates, the closed driving gear 3 and the closed reduction gear 4 are driven to rotate about their own axis, so that the end of the limiting element 5 is brought into abutment against the microswitch 6, thereby triggering the output of a control signal.Specifically, the roller 2 is rotatably mounted on one end of the support member 1 via a roller shaft, a bearing, and a pin, and a closed drive gear 3 is mounted on an axial end of the roller shaft, the closed reduction gear 4 is meshingly connected to one side of the closed drive gear 3, and the limiting member 5 is mounted on the gear shaft at the end of the closed reduction gear 4. When the reel 2 rotates, the closed drive gear 3 is driven to rotate synchronously and the rotational speed is reduced after the closed reduction gear 4 is used.In use, the reel 2 is pressed against the surface of the steel cord drum 25 or against the rotating surface of the shaft at the end face of the steel cord drum 25, respectively, so that the rotation of the steel cord drum 25 is converted into a power of the synchronously rolling reel 2, i.e. the reel 2 can rotate with the stroke of the crane. In the hoisting operation of the crane, the pulley 2 drives the closed drive gear 3 and the closed reduction gear 4 and makes its rotation about its own axis, then the closed reduction gear 4 drives the restriction member 5 to rotate slowly. During the crane movement, the roller 2 rotates several revolutions. However, due to the retarding action of the closed reduction gear 4, the limiting member 5 rotates only slightly. When the crane moves to the limit position, the end of the limit member 5 rotates and abuts on the micro switch 6, at which time the micro switch 6 outputs a control signal to control the crane to stop.In the present embodiment, a roller restrictor consisting of a support member 1, a roller 2, a closed drive gear 3, a closed reduction gear 4, a restrictor member 5 and a microswitch 6 is used to replace the conventional firestop restrictor. The gear train consisting of the closed drive gear 3 and the closed reduction gear 4 replaces the conventional screw train, the closed drive gear 3 and the closed reduction gear 4 transmit the force through line contact, whereby the wear can be effectively reduced; at the same time, by using a closed gear, dust, contaminants or the like can be effectively prevented from entering from the outside and causing friction; moreover, the closed gear train can completely lubricate the gear, whereby friction and wear between the gears are further reduced. In this way, the speed of transmission errors or disturbances is effectively slowed down and thus a frequent failure of the limiter is avoided.Moreover, the reel 2 of the present application does not come into contact with the steel cord upon detection, thereby avoiding the influence of oil stains, mineral deposits and cord entanglements and the like on the steel cord. The device makes the microswitch 6 directly output a switching signal via the contact between the limiting element 5 and the microswitch 6 without requiring signal conversion, thereby avoiding the generation of noise or errors during signal conversion, improving the control reliability and ensuring the accuracy and stability of the signal. At the same time, the direct output switching signal system can respond more quickly to input changes because no wait times are required for signal conversion and processing, improving the overall performance and response speed of the system.Moreover, the roller 2 and the closed reduction gear 4 of the device have a low rotational resistance and less wear. During the repeated forward and backward rotation of the reel 2, the detection error caused by the slip of the steel cord drum 25 can be automatically eliminated, thereby improving the detection accuracy.Second Embodiment:Referring to FIG. 2 based on the first embodiment, the closed reduction gear 4 includes:a first closed double layer gear 7 which is meshingly connected to the closed drive gear 3, the side of the first closed double layer gear 7 facing away from the closed drive gear 3 being meshingly connected to a second closed double layer gear 8, the side of the second closed double layer gear 8 facing away from the first closed double layer gear 7 being meshingly connected to a third closed double layer gear 9, the side of the third closed double layer gear 9 facing away from the second closed double layer gear 8 being meshingly connected to a fourth closed double layer gear 10.Specifically, each double layer gear includes a large gear and a small gear. The large gear of the first closed double layer gear 7 is located at the lower end of the small gear, and the closed drive gear 3 is meshingly connected to the large gear of the first closed double layer gear 7, the small gear of the first closed double layer gear 7 is meshingly connected to the large gear of the second closed double layer gear 8, the small gear of the second closed double layer gear 8 is meshingly connected to the large gear of the third closed double layer gear 9, the small gear of the third closed double layer gear 9 is meshingly connected to the large gear of the fourth closed double layer gear 10. In this way, the rotation speed of the closed drive gear 3 is reduced by meshing a plurality of large and small gears.Third Embodiment:Referring to FIG. 3, the limiting element 5 optionally comprises the following:an upper limit pointer 11 and a lower limit pointer 12 mounted on the transmission shaft of the fourth closed double layer gear 10;wherein at an end of the upper limit pointer 11 and of the lower limit pointer 12 facing away from the fourth closed double-layer gearwheel 10, an arc-shaped stop 13 is provided in each case.Specifically, in the hoisting operation of the crane, the rotation speed of the reel 2 is attenuated in multiple stages by the closed reduction gear 4. When the crane is raised to the upper limit position, the upper limit pointer 11 simply rotates to a specified position; in the lowering operation of the crane, the reel 2 is reversed and the speed is reduced in multiple stages by the closed reduction gear 4.Alternatively, it is provided that the microswitch 6 comprises an upper limit microswitch 14 and a lower limit microswitch 15; wherein an end of the upper limit microswitch 14 or of the lower limit microswitch 15 facing the fourth closed double-layer gearwheel 10 is provided with a switching tab 16, wherein an arc plate 17) is provided at an end of the switching tab 16.Specifically, it is arranged that the arc-shaped stopper 13 of the upper limit pointer 11 simply rotates to a predetermined position abutting against the arc plate 17 of the upper limit micro switch 14 when the crane is raised up to the upper limit position, so that the upper limit micro switch 14 outputs a control signal indicating that the upper limit is reached; and the arc-shaped stopper 13 of the lower limit pointer 12 simply rotates to a predetermined position abutting against the arc plate 17 of the lower limit micro switch 15 when the crane is lowered down to the lower limit position, so that the lower limit micro switch 15 outputs a control signal indicating that the lower limit is reached.The conventional fire-cut limiter is provided with only an upper limit microswitch and does not have a signal output for detecting over-winding of the steel cord, and the present application realizes the signal output of the two processes of over-winding and over-winding of the steel cord by the cooperation between the upper limit pointer 11 and the upper limit microswitch 14 and the lower limit pointer 12 and the lower limit microswitch 15, whereby over-winding of the drum and over-winding of the wire cord can be prevented, thereby preventing abnormal winding of the wire cord.Referring to FIG. 4, the fourth closed double layer gear 10 is optionally provided with four arc-shaped adjusting grooves 18, and a middle part of the upper limit pointer 11 and the lower limit pointer 12 is respectively fixed by a bolt 19 in two of the arc-shaped adjusting grooves 18.Specifically, in the present embodiment, the position adjustment of the upper limit pointer 11 and the lower limit pointer 12 can be achieved by loosening the screw 19, and by tightening the screw 19, the upper limit pointer 11 and the lower limit pointer 12 are locked in position. The positions of the upper limit hand 11 and the lower limit hand 12 in the arc-shaped adjusting groove 18 can be adjusted according to the lift height of the crane, thereby realizing the adjustment of the measurement range and then realizing the output signal for limitation for the upper and lower positions at different lift heights to prevent overwinding and overbarking and also avoid the replacement of the closed reduction gear 4.Fourth Embodiment:Referring to FIGS. 1 and 5, the support member 1 optionally includes:a base 20 and a bracket 21 disposed at an upper end of the base 20, wherein a spring 22 is disposed between the bracket 21 and the base 20;wherein the roller 2 is mounted on an end of the bracket 21 facing away from the base 20.Specifically, the lower surface of the bracket 21 is fixed to the base 20 with a screw, and the base 20 serves to support the bracket 21, and the bracket 21 serves to support the roller 2 and the gear driving component. One end of the spring 22 is connected to the bracket 21 via a bolt, and the other end is movably connected to the base 20 via a buckle, and the reel 2 is tightened by the spring 22 and pressed onto the steel cord drum 25. In the present embodiment, the tension exerted by the spring 22 can make the reel 2 firmly abut on the surface of the steel cord drum 25, thereby preventing the reel 2 from slipping or falling off the drum, thereby ensuring the stability and reliability of the drive.Alternatively, it is provided that a gear 23 is provided on the side surface of an end of the bracket 21 facing away from the base 20, and the closed drive gear 3, the closed reduction gear 4, and the micro switch 6 are all mounted in the gear 23.Specifically, it is arranged that the closed drive gear 3, the closed reduction gear 4 and the micro switch 6 are mounted in the gear 23 to form a closed gear system, thereby preventing the entry of dust, contaminants or the like from the outside and achieving the purpose of protecting the gears, extending their durability and ensuring their transmission performance and transmission accuracy.Alternatively, it is provided that the closed drive wheel 3 and the closed reduction gear 4 are both embodied as straight-toothed gears.Specifically, the use of a spur gear helps reduce shock and noise during transmission and achieve smoother transmission. Moreover, the spur gear has a higher transmission efficiency in low-speed transmission. The crane in the present embodiment has a slow speed when performing raising and lowering operations suitable for transmission through the spur gear.Alternatively, it is provided that the holder 21 has a curvature.Specifically, the bracket 21 is formed as an arcuate bracket having a certain curvature so that the reel 2 can be easily put on the steel cord drum 25, and at the same time, the arcuate bracket also facilitates the action of the tension force of the spring 22 on the reel 2, thereby improving the pressing action of the reel 2 on the steel cord drum 25.Alternatively, it is provided that a waist-shaped hole 24 is provided on the holder 21.Specifically, it is provided that the waist-shaped hole 24 is provided on the bracket 21 to reduce the weight of the bracket 21, and at the same time, the waist-shaped hole 24 is configured, when disassembling the bracket 21, so that the operator can more easily insert his fingers into the waist-shaped hole 24 to hold the bracket 21, thereby ensuring that the bracket 21 remains stable during disassembly, thereby improving the ease of disassembly.The apparatus has a compact structure, is not affected by the inertia of movement during crane operation, and can be applied to a steel cord drum 25 which is not provided with a terminal screw hole. After the cable end is cut off in the conventional firestop limiter, the dust cap and the guide rod must be removed and the slider rotated to achieve adjustment of the limit, which is a cumbersome operation. After the cable end is cut off in the limiter of the present application, only the bracket 21 needs to be opened and the pulley 2 rotated to set the limit for the upper and lower positions, which is more convenient than the fire-cut limiter having a screw rod driving structure.It should be noted that structures and / or installation methods not described in detail in the present application are known to those skilled in the art in combination with general knowledge and / or the related art and are not the gist of the disclosure of the present application and will not be further detailed herein.Finally, it should be noted that the above-mentioned preferred embodiments are merely for illustrating the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above-described preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope defined in the claims of the present application; the dimensions of the drawings do not have to do with the actual objects, and the dimensions of the actual objects may be changed arbitrarily.

Claims

A measurement range adjustable roller limiter, characterized in that the measurement range adjustable roller limiter comprises: a support member (1); a roller (2) rotatably mounted on one end of the support member (1); a closed reduction gear (4) meshingly connected to an axial end of the roller (2) via a closed drive gear (3); a limiting member (5) provided on the gear shaft at the end of the closed reduction gear (4), wherein a microswitch (6) is provided on an end of the limiting member (5) opposite to the closed reduction gear (4) accordingly; wherein, in the initial state, the limiting element (5) has no contact with the microswitch (6), wherein, when the roller (2) rotates, the closed driving gear (3) and the closed reduction gear (4) are driven to rotate about their own axis, so that the end of the limiting element (5) is brought into abutment against the microswitch (6), thereby triggering the output of a control signal.Adjustable range roller limiter according to claim 1, characterized in that the closed reduction gear (4) comprises: a first closed double layer gear (7) meshingly connected to the closed drive gear (3), the side of the first closed double layer gear (7) facing away from the closed drive gear (3) being meshingly connected to a second closed double layer gear (8), the side of the second closed double layer gear (8) facing away from the first closed double layer gear (7) being meshingly connected to a third closed double layer gear (9), the side of the third closed double layer gear (9) facing away from the second closed double layer gear (8) being meshingly connected to a fourth closed double layer gear (10).The adjustable range roller limiter according to claim 2, characterized in that the limiting member (5) comprises: an upper limit pointer (11) and a lower limit pointer (12) mounted on the gear shaft of the fourth closed double layer gear (10); wherein an arc-shaped stopper (13) is provided at an end of the upper limit pointer (11) and the lower limit pointer (12) opposite to the fourth closed double layer gear (10).Adjustable measuring range roller limiter according to claim 2, characterised in that the microswitch (6) comprises an upper limit microswitch (14) and a lower limit microswitch (15); wherein an end of the upper limit microswitch (14) and of the lower limit microswitch (15) facing the fourth closed double layer toothed wheel (10) is provided with a switching tab (16), wherein an arc plate (17) is provided at an end of the switching tab (16).The adjustable range roller limiter according to claim 3, characterized in that the fourth closed double layer gear (10) is provided with four arc-shaped adjusting grooves (18), a middle part of the upper limit pointer (11) and the lower limit pointer (12) being respectively fixed by a bolt (19) in two of the arc-shaped adjusting grooves (18).The adjustable measurement range roller limiter according to claim 1, characterized in that the support member (1) comprises: a base (20); and a bracket (21) disposed at an upper end of the base (20), wherein a spring (22) is disposed between the bracket (21) and the base (20); wherein the roller (2) is mounted at an end of the bracket (21) opposite to the base (20).Adjustable gauge roller limiter according to claim 6, characterized in that a gear (23) is provided on the side surface of an end of the support (21) facing away from the base (20), the closed drive gear (3), the closed reduction gear (4) and the microswitch (6) all being mounted in the gear (23).Adjustable measuring range roller limiter according to claim 1, characterised in that the closed drive gear (3) and the closed reduction gear (4) are both embodied as straight toothed gears.Roller limiter with adjustable measuring range according to claim 6 or 7, characterised in that the holder (21) has a curvature.Adjustable measuring range roller limiter according to claim 9, characterized in that a waist-shaped hole (24) is provided on the bracket (21).

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