Speed limiter for pulley

Abstract

The invention discloses a speed limiter for a tackle, and relates to the technical field of speed limiters, the speed limiter comprises a friction shell, a mounting shell, a plurality of friction blocks and a plurality of adjusting mechanisms, the mounting shell is used for being mounted on a walking wheel shaft of the tackle and can rotate along with wheels of the tackle, the friction shell is mounted on the walking wheel shaft of the tackle, and the friction blocks are arranged on the friction shell. The friction shell is located on the outer ring of the installation shell, the multiple friction blocks are installed on the installation shell in the circumferential direction around the center axis of the installation shell, and when the installation shell rotates along with wheels of the tackle, the friction blocks can move in the direction close to the friction shell in the radial direction of the installation shell and generate friction with the inner ring of the friction shell. Each friction block is provided with a containing cavity, the multiple friction blocks correspond to the multiple adjusting mechanisms in a one-to-one mode, the adjusting mechanisms are installed in the containing cavities, and the adjusting mechanisms can adjust the pre-tightening force on the friction blocks. The speed regulation function can be achieved, the structure is simple, and regulation is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of speed limiters, in particular to a speed limiter for a pulley. Background Art

[0002] Existing speed limiters usually use tension springs of different specifications to achieve different speed limit targets. Once the specifications of the tension springs are selected, the speed limit effect that the speed limiter can achieve is limited, and the speed regulation function can no longer be adjusted. At the same time, the space inside the speed limiter is limited. When a tension spring of smaller specifications is used to achieve a higher speed limit target, it is greatly affected by the heat generated by friction, and even causes the tension spring to break easily. In addition, during the use of the speed limiter, the friction block will produce a certain degree of wear, resulting in the inability to meet the speed limit requirements. Since the friction block cannot be adjusted, it can only be disassembled and replaced with a new one, which greatly increases the cost of use. Summary of the invention

[0003] The object of the present invention is to provide a speed limiter for a pulley to solve the problems existing in the above-mentioned prior art, realize the speed regulation function, and have a simple structure and convenient adjustment.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a speed limiter for a pulley, comprising a friction shell, a mounting shell, a plurality of friction blocks and a plurality of adjustment mechanisms, wherein the mounting shell is used to be mounted on a traveling wheel axle of the pulley, and the mounting shell can rotate with the wheel of the pulley, the friction shell is mounted on the traveling wheel axle of the pulley, and the friction shell is located at the outer ring of the mounting shell, a plurality of the friction blocks are circumferentially mounted on the mounting shell around the central axis of the mounting shell, when the mounting shell rotates with the wheel of the pulley, the friction blocks can move in a radial direction of the mounting shell toward the friction shell and generate friction with the inner ring of the friction shell, a accommodating cavity is provided on the friction block, a plurality of the friction blocks and a plurality of the adjustment mechanisms correspond one to one, the adjustment mechanism is mounted in the accommodating cavity, and the adjustment mechanism can adjust the pre-tightening force on the friction block.

[0006] Preferably, the adjustment mechanism includes a guide bolt, an adjusting nut and an elastic element, the guide bolt is installed in the accommodating cavity, and the first end of the guide bolt is located in the accommodating cavity, the second end of the guide bolt extends out of the accommodating cavity and extends in a direction close to the central axis of the mounting shell, the elastic element is sleeved on the outer periphery of the guide bolt, and one end of the elastic element is connected to the first end of the guide bolt, the other end of the elastic element extends in a direction close to the second end of the guide bolt and abuts against the inner wall of the accommodating cavity, the second end of the guide bolt is threadedly connected to the adjusting nut, and the adjusting nut is located outside the accommodating cavity.

[0007] Preferably, the adjustment mechanism further comprises a mounting seat, the mounting seat is sleeved on the first end of the guide bolt, and one end of the elastic element is fixed on the mounting seat.

[0008] Preferably, the adjustment mechanism further includes a stopper, which is sleeved on the outer circumference of the guide bolt and is located between the friction block and the adjustment nut.

[0009] Preferably, the elastic element is a compression spring.

[0010] Preferably, a plurality of adjustment holes are provided on the mounting shell, the plurality of adjustment holes correspond one-to-one to the plurality of friction blocks, and the adjustment holes are located on the side of the friction block away from the friction shell, the second end of the guide bolt extends into the adjustment hole, and the adjustment nut is located in the adjustment hole.

[0011] Preferably, the friction shell is made of heat-conducting material.

[0012] Preferably, the plurality of friction blocks are evenly arranged on the mounting shell.

[0013] Preferably, the cross-section of the friction block is sector-shaped, and the cross-section of the accommodating cavity is sector-shaped.

[0014] Preferably, the number of the friction blocks is four.

[0015] Compared with the prior art, the present invention has achieved the following technical effects:

[0016] The speed limiter for a pulley provided by the present invention comprises a mounting shell for mounting on a traveling wheel axle of the pulley, and the mounting shell can rotate with the wheel of the pulley, a friction shell is mounted on the traveling wheel axle of the pulley, and the friction shell is located at an outer ring of the mounting shell, and with the rotation of the mounting shell, the friction shell and the mounting shell can rotate relative to each other, a plurality of friction blocks are circumferentially mounted on the mounting shell around a central axis of the mounting shell, and when the mounting shell rotates with the wheel of the pulley, under the action of centrifugal force, the friction blocks can move in a radial direction of the mounting shell toward the friction shell and generate friction with the inner ring of the friction shell, and with the further acceleration of the wheel rotation speed, the friction between the friction blocks and the friction shell increases. The friction force is further increased, which plays a speed limiting role, and the heat generated by the friction can be dissipated through the friction shell. A accommodating cavity is provided on the friction block, and multiple friction blocks and multiple adjusting mechanisms correspond to each other. The adjusting mechanism is installed in the accommodating cavity, and the adjusting mechanism can adjust the pre-tightening force on the friction block, thereby giving the friction block an initial force. During the rotation of the wheel, when the vehicle speed is increased to the point where the centrifugal force generated by the rotation of the friction block is greater than the initial force applied to the friction block by the adjusting mechanism, the friction block can move and then contact and rub with the friction shell. At the same time, by adjusting the pre-tightening force applied to the friction block by the adjusting mechanism, the speed limit target can be accurately adjusted, and the overall structure is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of a speed limiter for a pulley in the present invention;

[0019] Figure 2 It is a structural schematic diagram of the friction block and the adjustment mechanism in the present invention;

[0020] In the figure: 1-friction housing, 2-mounting housing, 3-friction block, 4-accommodating chamber, 5-adjusting mechanism, 6-adjusting hole, 7-guide bolt, 8-mounting seat, 9-compression spring, 10-adjusting nut, 11-stopper. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The purpose of the present invention is to provide a speed limiter for a pulley to solve the problems existing in the prior art, realize the speed regulation function, and has a simple structure and is convenient for adjustment.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1-Figure 2 As shown, this embodiment provides a speed limiter for a pulley, comprising a friction shell 1, a mounting shell 2, a plurality of friction blocks 3 and a plurality of adjustment mechanisms 5. The mounting shell 2 is used to be mounted on the travel wheel shaft of the pulley, and the mounting shell 2 can rotate with the wheel of the pulley. The friction shell 1 is mounted on the travel wheel shaft of the pulley, and the friction shell 1 is located at the outer ring of the mounting shell 2. With the rotation of the mounting shell 2, the friction shell 1 and the mounting shell 2 can rotate relative to each other. The plurality of friction blocks 3 are circumferentially mounted on the mounting shell 2 around the central axis of the mounting shell 2. When the mounting shell 2 rotates with the wheel of the pulley, under the action of centrifugal force, the friction blocks 3 can move in the radial direction of the mounting shell 2 toward the friction shell 1 and generate friction with the inner ring of the friction shell 1. As the wheel rotation speed increases, the friction blocks 3 move toward the inner ring of the friction shell 1. The speed is accelerated, and the friction between the friction block 3 and the friction shell 1 is further increased, which plays a speed limiting role, and the heat generated by the friction can be dissipated through the friction shell 1. A accommodating cavity 4 is provided on the friction block 3, and multiple friction blocks 3 and multiple adjusting mechanisms 5 correspond to each other. The adjusting mechanism 5 is installed in the accommodating cavity 4, and the adjusting mechanism 5 can adjust the pre-tightening force on the friction block 3, and then give the friction block 3 an initial force. During the rotation of the wheel, when the vehicle speed is increased to the point where the centrifugal force generated by the rotation of the friction block 3 is greater than the initial force applied to the friction block 3 by the adjusting mechanism 5, the friction block 3 can move and then contact and rub with the friction shell 1. At the same time, by adjusting the pre-tightening force applied to the friction block 3 by the adjusting mechanism 5, the speed limit target can be accurately adjusted, and the overall structure is simple and easy to operate.

[0025] Specifically, the adjustment mechanism 5 includes a guide bolt 7, an adjusting nut 10 and an elastic element. The guide bolt 7 is installed in the accommodating chamber 4 to guide the movement of the friction block 3. The first end of the guide bolt 7 is located in the accommodating chamber 4, and the second end of the guide bolt 7 extends out of the accommodating chamber 4 and extends in a direction close to the central axis of the mounting shell 2. The elastic element is sleeved on the outer periphery of the guide bolt 7, and one end of the elastic element is connected to the first end of the guide bolt 7, and the other end of the elastic element extends in a direction close to the second end of the guide bolt 7 and abuts against the inner wall of the accommodating chamber 4. The second end of the guide bolt 7 is threadedly connected to the adjusting nut 10, and the adjusting nut 10 is located outside the accommodating chamber 4. Through the above design, when the wheel rotates, the friction block 3 overcomes the resistance of the elastic element under the action of centrifugal force and moves toward the direction close to the friction shell 1 until it contacts and rubs with the friction shell 1, thereby playing a speed limiting role; and when the speed limit target needs to be adjusted, for example, by rotating the adjustment nut 10, the adjustment nut 10 is connected to different positions of the guide bolt 7, so that the inner wall of the friction block 3 and the guide bolt 7 act on the elastic element together to adjust the preload force of the elastic element, thereby achieving different speed limit targets. At the same time, since the adjustment mechanism 5 is provided, even if the friction block 3 is worn to a certain extent, the preload force of the elastic element can be adjusted to meet the speed limit requirements without directly replacing the friction block 3, thereby reducing costs and extending service life.

[0026] The adjustment mechanism 5 also includes a mounting seat 8, which is sleeved on the first end of the guide bolt 7, and one end of the elastic element is fixed on the mounting seat 8 to achieve stable installation of the elastic element so that the mounting seat 8 cooperates with the inner wall of the accommodating cavity 4 to compress the reset element.

[0027] The adjustment mechanism 5 further includes a stopper 11 , which is sleeved on the outer circumference of the guide bolt 7 and is located between the friction block 3 and the adjustment nut 10 , so as to protect the friction block 3 .

[0028] The elastic element is a compression spring 9. In actual application, after initially selecting a suitable compression spring 9, the preload force of the compression spring 9 is adjusted to achieve the desired precise speed limit target, thereby enabling this embodiment to have a larger speed limit target adjustment range.

[0029] A plurality of adjustment holes 6 are provided on the mounting shell 2, and the plurality of adjustment holes 6 correspond to the plurality of friction blocks 3 one by one, and the adjustment holes 6 are located on the side of the friction block 3 away from the friction shell 1, and the second end of the guide bolt 7 extends into the adjustment hole 6, and the adjustment nut 10 is located in the adjustment hole 6. The speed limit target can be adjusted without disassembling the entire device, which is convenient to use, improves efficiency, and is easy to maintain, service, and inspect.

[0030] The friction housing 1 is made of heat-conducting material and can dissipate the heat generated by the friction of the friction block 3 .

[0031] A plurality of friction blocks 3 are evenly arranged on the mounting housing 2 .

[0032] The cross section of the friction block 3 is sector-shaped, and the cross section of the accommodating cavity 4 is sector-shaped, which can achieve a good speed limiting effect. Those skilled in the art can also adaptively adjust the specific shapes according to actual needs.

[0033] The number of friction blocks 3 is four, and those skilled in the art can also adjust the number of friction blocks 3 according to actual needs.

[0034] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A speed limiter for a pulley, characterized in that: It includes a friction shell, a mounting shell, a plurality of friction blocks and a plurality of adjustment mechanisms. The mounting shell is used to be mounted on the travel wheel axle of the pulley, and the mounting shell can rotate with the wheel of the pulley. The friction shell is mounted on the travel wheel axle of the pulley, and the friction shell is located at the outer ring of the mounting shell. A plurality of friction blocks are circumferentially mounted on the mounting shell around the central axis of the mounting shell. When the mounting shell rotates with the wheel of the pulley, the friction blocks can move along the radial direction of the mounting shell toward the friction shell and generate friction with the inner ring of the friction shell. An accommodating cavity is provided on the friction block. The plurality of friction blocks and the plurality of adjustment mechanisms correspond one to one. The adjustment mechanism is mounted in the accommodating cavity, and the adjustment mechanism can adjust the pre-tightening force on the friction block.

2. The speed limiter for a pulley according to claim 1, characterized in that: The adjustment mechanism includes a guide bolt, an adjusting nut and an elastic element. The guide bolt is installed in the accommodating cavity, and the first end of the guide bolt is located in the accommodating cavity. The second end of the guide bolt extends out of the accommodating cavity and extends in a direction close to the central axis of the mounting shell. The elastic element is sleeved on the outer periphery of the guide bolt, and one end of the elastic element is connected to the first end of the guide bolt, and the other end of the elastic element extends in a direction close to the second end of the guide bolt and abuts against the inner wall of the accommodating cavity. The second end of the guide bolt is threadedly connected to the adjusting nut, and the adjusting nut is located outside the accommodating cavity.

3. The speed limiter for a pulley according to claim 2, characterized in that: The adjustment mechanism further comprises a mounting seat, wherein the mounting seat is sleeved on the first end of the guide bolt, and one end of the elastic element is fixed on the mounting seat.

4. The speed limiter for a pulley according to claim 2, characterized in that: The adjustment mechanism further comprises a stopper, which is sleeved on the outer periphery of the guide bolt and is located between the friction block and the adjustment nut.

5. The speed limiter for a pulley according to claim 2, characterized in that: The elastic element is a compression spring.

6. The speed limiter for a pulley according to claim 2, characterized in that: The mounting shell is provided with a plurality of adjustment holes, the plurality of adjustment holes correspond one to one with the plurality of friction blocks, and the adjustment holes are located on the side of the friction block away from the friction shell, the second end of the guide bolt extends into the adjustment hole, and the adjustment nut is located in the adjustment hole.

7. The speed limiter for a pulley according to claim 1, characterized in that: The friction shell is made of heat-conducting material.

8. The speed limiter for a pulley according to claim 1, characterized in that: The plurality of friction blocks are evenly arranged on the mounting shell.

9. The speed limiter for a pulley according to claim 1, characterized in that: The cross section of the friction block is sector-shaped, and the cross section of the accommodating cavity is sector-shaped.

10. The speed limiter for a pulley according to claim 1, characterized in that: The number of the friction blocks is four.

Images