Rolling wheel type limiting stopper with adjustable measuring range

Abstract

The invention relates to a rolling wheel type limiting stopper with an adjustable range. The rolling wheel type limiting stopper comprises a supporting piece; the roller is rotationally mounted at one end of the supporting piece; the closed reduction gear set is in meshed connection with one axial end of the roller through a closed driving gear; the limiting piece is arranged on a gear shaft at the tail end of the closed reduction gear set, and a microswitch is correspondingly arranged at one end, far away from the closed reduction gear set, of the limiting piece. The roller type limiter composed of the supporting piece, the roller, the closed driving gear, the closed reduction gear set, the limiting piece and the microswitch is adopted to replace a traditional fire cutoff type limiter, and traditional lead screw transmission is replaced with gear transmission composed of the closed driving gear and the closed reduction gear set. The closed driving gear and the closed reduction gear set transmit power through line contact, and abrasion can be effectively reduced; the closed gear can effectively prevent external dust, impurities and the like from entering to cause friction. In this way, the speed of transmission failure or jamming is effectively reduced, and then frequent failure of the limiting stopper is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of limit switches, and in particular to a roller limit switch with an adjustable range. Background Art

[0002] Limiters, also known as overload limiters, can be set to keep the machine moving within the specified position. When the machine reaches or exceeds the set position, the limiter will send a signal or take certain control measures to stop or change the direction of movement, thereby preventing the machine from moving beyond the range and avoiding accidental damage or danger.

[0003] In the environment of mining grab cranes, the commonly used limiters are usually fire-off limiters with a screw transmission structure. Its working principle is: when the equipment needs to move, the screw transfers power to the limiter body by rotation. As the screw rotates, the push-pull rod (or action rod) will perform corresponding linear motion. When the push-pull rod (or action rod) moves to the preset position, it triggers the contact action in the limiter body. The contact action causes the circuit to be interrupted, thereby cutting off the main power supply and realizing the limit function.

[0004] However, the way in which the slider and the screw in the screw drive transmit power through surface contact can easily lead to rapid thread wear of the slider, causing the slider to fail or get stuck quickly, resulting in frequent failure of the limiter. Summary of the invention

[0005] In order to solve or partially solve the problems existing in the related art, the present application provides a roller limiter with an adjustable range.

[0006] To achieve the above objectives, this application is implemented through the following technical solutions:

[0007] A roller type limiter with adjustable range, the roller type limiter with adjustable range comprising:

[0008] Supports;

[0009] Rotating a roller mounted on one end of the support member;

[0010] A closed reduction gear set meshingly connected to one axial end of the roller through a closed drive gear;

[0011] A limiter is arranged on the gear shaft at the end of the closed reduction gear set, and a micro switch is arranged corresponding to the end of the limiter away from the closed reduction gear set;

[0012] Among them, in the initial state, the limit member is not in contact with the micro switch. When the roller rotates, the closed driving gear and the closed reduction gear set are driven to rotate around their own axes, so that the end of the limit member abuts the micro switch, thereby triggering the control signal output.

[0013] Optionally, the closed reduction gear set comprises:

[0014] A first closed double-layer gear is meshed with the closed driving gear, a second closed double-layer gear is meshed with the side of the first closed double-layer gear away from the closed driving gear, a third closed double-layer gear is meshed with the side of the second closed double-layer gear away from the first closed double-layer gear, and a fourth closed double-layer gear is meshed with the side of the third closed double-layer gear away from the second closed double-layer gear.

[0015] Optionally, the limiting member includes:

[0016] An upper limit pointer and a lower limit pointer installed on the gear shaft of the fourth closed double-layer gear;

[0017] Wherein, an arc-shaped stopper is arranged at one end of the upper limit pointer and the lower limit pointer away from the fourth closed double-layer gear.

[0018] Optionally, the micro switch includes an upper limit micro switch and a lower limit micro switch;

[0019] Among them, a paddle is provided at one end of the upper limit micro switch and the lower limit micro switch close to the fourth closed double-layer gear, and an arc piece is provided at one end of the paddle.

[0020] Optionally, the fourth closed double-layer gear is provided with four arc-shaped adjustment grooves, and the middle parts of the upper limit pointer and the lower limit pointer are fixed in two of the arc-shaped adjustment grooves by screws respectively.

[0021] Optionally, the support member comprises:

[0022] A base, a bracket arranged at the upper end of the base, and a spring is arranged between the bracket and the base;

[0023] The roller is installed at one end of the bracket away from the base.

[0024] Optionally, a gear box is provided on the side surface of one end of the bracket away from the base, and the closed driving gear, the closed reduction gear set and the micro switch are all installed in the gear box.

[0025] Optionally, the closed drive gear and the closed reduction gear set both use spur gears.

[0026] Optionally, the bracket has a curvature.

[0027] Optionally, a waist-shaped hole is provided on the bracket.

[0028] Beneficial effects of the present application: The present application adopts a roller-type limiter composed of a support, a roller, a closed drive gear, a closed reduction gear set, a limiter and a micro switch to replace the traditional fire-off limiter, and replaces the traditional screw drive with a gear transmission composed of a closed drive gear and a closed reduction gear set. The closed drive gear and the closed reduction gear set transmit power through line contact, which can effectively reduce wear; at the same time, the use of closed gears can effectively prevent external dust, impurities, etc. from entering and causing friction; in addition, the closed gear transmission can fully lubricate the gears, further reducing friction and wear between gears. In this way, the speed of transmission failure or jamming is effectively slowed down, thereby avoiding frequent failure of the limiter.

[0029] It should 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 DRAWINGS

[0030] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0031] Figure 1 1 is a first viewing angle diagram of the roller type limiter with adjustable range shown in the embodiment of the present application;

[0032] Figure 2 It is a structural schematic diagram of a closed reduction gear set shown in an embodiment of the present application;

[0033] Figure 3 It is a partial enlarged view of the roller type limiter with adjustable range shown in the embodiment of the present application;

[0034] Figure 4 It is a schematic diagram of the structure of the limiter of the roller type limiter with adjustable range shown in the embodiment of the present application;

[0035] Figure 5 This is a first viewing angle diagram of the roller limiter with adjustable range shown in the embodiment of the present application.

[0036] Figure numerals: 1 support member, 2 roller, 3 closed drive gear, 4 closed reduction gear set, 5 limit 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-shaped stopper, 14 upper limit micro switch, 15 lower limit micro switch, 16 paddle, 17 arc piece, 18 arc-shaped adjustment groove, 19 screw, 20 base, 21 bracket, 22 spring, 23 gear box, 24 waist-shaped hole, 25 rope drum. DETAILED DESCRIPTION

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific situation.

[0040] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations 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 one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0042] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

[0043] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0044] In order to make the purpose, technical solutions and beneficial 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 to facilitate understanding by technical personnel.

[0045] Embodiment 1:

[0046] See also Figure 1 and Figure 2 , a roller type limiter with adjustable range, the roller type limiter with adjustable range comprising:

[0047] Support member 1;

[0048] Rotate the roller 2 mounted on one end of the support 1;

[0049] A closed reduction gear set 4 meshingly connected to one axial end of the roller 2 through a closed driving gear 3;

[0050] A stopper 5 is provided on the gear shaft at the end of the closed reduction gear set 4, and a micro switch 6 is correspondingly provided at one end of the stopper 5 away from the closed reduction gear set 4;

[0051] Among them, in the initial state, the limit member 5 is not in contact with the micro switch 6. When the roller 2 rotates, the closed driving gear 3 and the closed reduction gear group 4 are driven to rotate around their own axes, so that the end of the limit member 5 abuts against the micro switch 6, thereby triggering the control signal output.

[0052] Specifically, the roller 2 is rotatably mounted on one end of the support member 1 through a roller shaft, a bearing and a pin, a closed drive gear 3 is mounted on one axial end of the roller shaft, a closed reduction gear set 4 is meshedly connected to one side of the closed drive gear 3, and a stopper 5 is mounted on the gear shaft at the end of the closed reduction gear set 4. When the roller 2 rotates, the closed drive gear 3 is driven to rotate synchronously, and the speed is reduced after the closed reduction gear set 4.

[0053] When in use, the roller 2 is pressed against the surface of the rope drum 25, or against the rotating surface of the shaft at the end face of the rope drum 25, so that the rotation of the rope drum 25 is converted into the synchronously rolling output of the roller 2, that is, the roller 2 can rotate with the lifting and lowering of the crane. During the lifting and lowering process of the crane, the roller 2 drives the closed driving gear 3 and the closed reduction gear set 4 to rotate around its own axis, and then the closed reduction gear set 4 drives the limiter 5 to rotate slowly. During the movement of the crane, the roller 2 will rotate several times. However, due to the deceleration effect of the closed reduction gear set 4, the limiter 5 will only rotate slightly. When the crane moves to the extreme position, the end of the limiter 5 just rotates to abut against the micro switch 6. At this time, the micro switch 6 outputs a control signal to control the crane to stop running.

[0054] In this embodiment, a roller-type limiter consisting of a support 1, a roller 2, a closed drive gear 3, a closed reduction gear set 4, a limiter 5 and a micro switch 6 is used to replace the traditional fire-off limiter, and a gear transmission consisting of a closed drive gear 3 and a closed reduction gear set 4 is used to replace the traditional screw transmission. The closed drive gear 3 and the closed reduction gear set 4 transmit power through line contact, which can effectively reduce wear; at the same time, the use of closed gears can effectively prevent external dust, impurities, etc. from entering and causing friction; in addition, the closed gear transmission can fully lubricate the gears, further reducing friction and wear between gears. In this way, the speed of transmission failure or jamming is effectively slowed down, thereby avoiding frequent failure of the limiter.

[0055] The roller 2 of the present application does not contact the steel rope detection, thus avoiding the influence of steel rope oil, mineral accumulation and steel rope winding. The present device makes the micro switch 6 directly output the switch signal through the contact between the limiter 5 and the micro switch 6, without the need for signal conversion, thus avoiding the introduction of noise or error during the signal conversion process, improving the reliability of control, and ensuring the accuracy and stability of the signal. At the same time, the system that directly outputs the switch signal can respond to input changes more quickly because there is no need to wait for signal conversion and processing, which improves the overall performance and response speed of the system.

[0056] In addition, the roller 2 and the closed reduction gear set 4 of the device have small rotation resistance and less wear. During the repeated forward and reverse rotation of the roller 2, the detection error caused by the slippage of the steel rope drum 25 can be automatically eliminated, thereby improving the detection accuracy.

[0057] Embodiment 2:

[0058] See also Figure 2 , based on embodiment 1, optionally, the closed reduction gear set 4 includes:

[0059] The first closed double-layer gear 7 is meshed with the closed driving gear 3, the first closed double-layer gear 7 is meshed with the second closed double-layer gear 8 on the side away from the closed driving gear 3, the second closed double-layer gear 8 is meshed with the third closed double-layer gear 9 on the side away from the first closed double-layer gear 7, and the third closed double-layer gear 9 is meshed with the fourth closed double-layer gear 10 on the side away from the second closed double-layer gear 8.

[0060] 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, the closed drive gear 3 is meshed and connected with the large gear of the first closed double-layer gear 7, the small gear of the first closed double-layer gear 7 is meshed and connected with the large gear of the second closed double-layer gear 8, the small gear of the second closed double-layer gear 8 is meshed and connected with the large gear of the third closed double-layer gear 9, and the small gear of the third closed double-layer gear 9 is meshed and connected with the large gear of the fourth closed double-layer gear 10. In this way, the speed of the closed drive gear 3 is reduced by the meshing connection of several large and small gears.

[0061] Embodiment three:

[0062] See also Figure 3 Optionally, the limiting member 5 includes:

[0063] An upper limit pointer 11 and a lower limit pointer 12 mounted on the gear shaft of the fourth closed double-layer gear 10;

[0064] An arc-shaped stopper 13 is provided at one end of the upper limit pointer 11 and the lower limit pointer 12 away from the fourth closed double-layer gear 10 .

[0065] Specifically, during the lifting process of the crane, the rotation speed of the roller 2 is attenuated in multiple stages through the closed reduction gear set 4. When the crane is lifted to the upper limit position, the upper limit pointer 11 just rotates to a specific position; during the lowering process of the crane, the roller 2 reverses, and its rotation speed is attenuated in multiple stages through the closed reduction gear set 4. When the crane is lowered to the lower limit position, the lower limit pointer 12 just rotates to a specific position.

[0066] Optionally, the micro switch 6 includes an upper limit micro switch 14 and a lower limit micro switch 15;

[0067] Among them, a paddle 16 is provided at one end of the upper limit micro switch 14 and the lower limit micro switch 15 close to the fourth closed double-layer gear 10 , and an arc piece 17 is provided at one end of the paddle 16 .

[0068] Specifically, when the crane is lifted to the upper limit position, the arc-shaped stopper 13 of the upper limit pointer 11 just rotates to a specific position abutting against the arc piece 17 of the upper limit microswitch 14, so that the upper limit microswitch 14 outputs a control signal that the upper limit is in place; when the crane is lowered to the lower limit position, the arc-shaped stopper 13 of the lower limit pointer 12 just rotates to a specific position abutting against the arc piece 17 of the lower limit microswitch 15, so that the lower limit microswitch 15 outputs a control signal that the lower limit is in place.

[0069] The traditional fire-off limiter is only equipped with an upper limit microswitch and does not have a signal output for detecting over-release of the steel rope. The present application realizes the signal output of the two processes of over-winding and over-releasing of the steel rope through the cooperation of the upper limit pointer 11 and the upper limit microswitch 14, and the lower limit pointer 12 and the lower limit microswitch 15, thereby preventing the reel from over-winding and over-releasing, and avoiding the problem of abnormal winding of the steel rope.

[0070] See also Figure 4 Optionally, four arc-shaped adjustment grooves 18 are provided on the fourth closed double-layer gear 10 , and the middle parts of the upper limit pointer 11 and the lower limit pointer 12 are fixed in two of the arc-shaped adjustment grooves 18 by screws 19 respectively.

[0071] Specifically, in this 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 the position locking of the upper limit pointer 11 and the lower limit pointer 12 can be achieved by tightening the screw 19. The position of the upper limit pointer 11 and the lower limit pointer 12 in the arc adjustment slot 18 can be adjusted according to the lifting height of the crane, so as to achieve range adjustment, and then realize the upper and lower limit output signals at different lifting heights, prevent overwinding and overrelease, and also avoid replacing the closed reduction gear set 4.

[0072] Embodiment 4:

[0073] See also Figure 1 and Figure 5 Optionally, the support member 1 comprises:

[0074] A base 20, a bracket 21 disposed at the upper end of the base 20, and a spring 22 disposed between the bracket 21 and the base 20;

[0075] The roller 2 is installed at one end of the bracket 21 away from the base 20 .

[0076] Specifically, the bottom of the bracket 21 is mounted on the base 20 by bolts, the base 20 is used to support the bracket 21, and the bracket 21 is used to support the roller 2 and the gear transmission component. One end of the spring 22 is connected to the bracket 21 by bolts, and the other end is movably connected to the base 20 by a buckle. The roller 2 is tightened and pressed on the steel rope drum 25 by the spring 22. In this embodiment, the tension applied by the spring 22 can ensure that the roller 2 is tightly attached to the surface of the steel rope drum 25, preventing the roller 2 from sliding or falling off the drum, thereby ensuring the stability and reliability of the transmission.

[0077] Optionally, a gear box 23 is provided on the side surface of one end of the bracket 21 away from the base 20 , and the closed driving gear 3 , the closed reduction gear set 4 and the micro switch 6 are all installed in the gear box 23 .

[0078] Specifically, a closed drive gear 3, a closed reduction gear set 4 and a micro switch 6 are installed in a gear box 23 to form a closed gear transmission system, thereby preventing the entry of external dust, impurities, etc., thereby achieving the purpose of protecting the gears, extending their service life, and ensuring their transmission performance and transmission accuracy.

[0079] Optionally, the closed drive gear 3 and the closed reduction gear set 4 are both spur gears.

[0080] Specifically, the use of spur gears helps reduce the impact and noise during transmission and achieves a smoother transmission. In addition, spur gears have a higher transmission efficiency during low-speed transmission. The crane in this embodiment has a slow speed during lifting and lowering operations, which is suitable for spur gear transmission.

[0081] Optionally, the bracket 21 has a curvature.

[0082] Specifically, the bracket 21 is designed to be an arc-shaped bracket with a certain curvature, which facilitates the roller 2 to rest against the steel rope drum 25. At the same time, the arc-shaped bracket also facilitates the tensioning force of the spring 22 to act on the roller 2, thereby improving the pressing effect of the roller 2 on the steel rope drum 25.

[0083] Optionally, a waist-shaped hole 24 is formed on the bracket 21 .

[0084] Specifically, a waist-shaped hole 24 is opened on the bracket 21 to reduce the weight of the bracket 21. At the same time, when disassembling the bracket 21, the design of the waist-shaped hole 24 makes it convenient for the operator to insert his fingers into the waist-shaped hole 24 to hold the bracket 21, ensuring that the bracket 21 remains stable during disassembly, thereby improving the convenience of disassembly.

[0085] The device has a compact structure and is not affected by the inertia of the crane during operation. It can be applied to a steel rope drum 25 without a connecting screw hole. After the rope head is cut off, the traditional fire-breaking limiter needs to remove the dust cover and the guide rod and rotate the slider to adjust the limit, which is a cumbersome process. After the rope head is cut off, the limiter of the present application only needs to pull open the bracket 21 and rotate the roller 2 to adjust the upper and lower limits, which is more convenient than the fire-breaking limiter with a screw transmission structure.

[0086] It should be noted that structures and / or installation methods not described in detail in this application are known to those skilled in the art in combination with common knowledge and / or prior art, and are not the focus of disclosure in this application and will not be further elaborated herein.

[0087] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the present application rather than to limit it. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present application; the dimensions of the drawings are not related to the specific objects, and the dimensions of the objects can be changed arbitrarily.

Claims

1. A roller type limiter with adjustable range, characterized in that: The adjustable range roller limiter comprises: Support member (1); Rotating a roller (2) mounted on one end of the support member (1); A closed reduction gear set (4) meshingly connected to one axial end of the roller (2) via a closed drive gear (3); A limiter (5) is arranged on the gear shaft at the end of the closed reduction gear set (4), and a micro switch (6) is correspondingly arranged at one end of the limiter (5) away from the closed reduction gear set (4); In the initial state, the limit member (5) is not in contact with the micro switch (6). When the roller (2) rotates, the closed drive gear (3) and the closed reduction gear set (4) are driven to rotate around their own axes, so that the end of the limit member (5) abuts against the micro switch (6), thereby triggering the output of the control signal.

2. The range-adjustable roller limiter according to claim 1, characterized in that: The enclosed reduction gear set (4) comprises: A first closed double-layer gear (7) is meshedly connected to the closed driving gear (3); a second closed double-layer gear (8) is meshedly connected to the side of the first closed double-layer gear (7) away from the closed driving gear (3); a third closed double-layer gear (9) is meshedly connected to the side of the second closed double-layer gear (8) away from the first closed double-layer gear (7); and a fourth closed double-layer gear (10) is meshedly connected to the side of the third closed double-layer gear (9) away from the second closed double-layer gear (8).

3. 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); An arc-shaped stopper (13) is provided at one end of the upper limit pointer (11) and the lower limit pointer (12) away from the fourth closed double-layer gear (10).

4. The range-adjustable roller limiter according to claim 2, characterized in that: The micro switch (6) comprises an upper limit micro switch (14) and a lower limit micro switch (15); The upper limit micro switch (14) and the lower limit micro switch (15) are provided with a paddle (16) at one end close to the fourth closed double-layer gear (10), and an arc piece (17) is provided at one end of the paddle (16).

5. The range-adjustable roller limiter according to claim 3, characterized in that: The fourth closed double-layer gear (10) is provided with four arc-shaped adjustment grooves (18), and the middle parts of the upper limit pointer (11) and the lower limit pointer (12) are fixed in two of the arc-shaped adjustment grooves (18) by screws (19) respectively.

6. The range-adjustable roller limiter according to claim 1, characterized in that: The support member (1) comprises: A base (20), a bracket (21) disposed at the upper end of the base (20), and a spring (22) disposed between the bracket (21) and the base (20); The roller (2) is mounted on an end of the bracket (21) away from the base (20).

7. The range-adjustable roller limiter according to claim 6, characterized in that: A gear box (23) is provided on the side surface of one end of the bracket (21) away from the base (20), and the closed driving gear (3), the closed reduction gear set (4) and the micro switch (6) are all installed in the gear box (23).

8. The range-adjustable roller limiter according to claim 1, characterized in that: The closed drive gear (3) and the closed reduction gear set (4) are both spur gears.

9. The range-adjustable roller limiter according to claim 6 or 7, characterized in that: The support (21) has a curvature.

10. The range-adjustable roller limiter according to claim 9, characterized in that: The bracket (21) is provided with a waist-shaped hole (24).

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