WO2016175556A1

WO2016175556A1 - Pulley with slit

Info

Publication number: WO2016175556A1
Application number: PCT/KR2016/004412
Authority: WO
Inventors: 김병수; 음용진
Original assignee: 주식회사 로보티즈
Priority date: 2015-04-27
Filing date: 2016-04-27
Publication date: 2016-11-03
Also published as: KR20160127546A

Abstract

One embodiment of the present invention relates to a pulley having a slit and, more particularly, to a pulley having a slit which can reduce the press-fit strength of a spindle by adding a slit regarding the degree of looseness/tightness according to dimensional deviations when a spindle part is inserted. According to a pulley with a slit of one embodiment of the present invention, a space for contraction and expansion is formed in the pulley, thereby forming a structure which enables contraction and expansion at the time of assembling or separation.

Description

Pulley with slit

The present invention relates to a pulley having a slit, and more particularly, when a spindle part is inserted, the tension is added by adding a slit to loosen and stiffness according to the dimensional deviation. A pulley with an improved slit to have a suitable indentation strength.

In general, a belt conveyor used for transporting raw materials and materials is rotatably supported by a hollow pulley while a rubber is attached to an outer circumferential surface of the pulley. The rubber is provided to prevent slippage between the pulley and the conveyor belt driven by the pulley. Since the rubber is formed in a plate shape and attached to the outer circumferential surface of the pulley, the rubber is provided to prevent slippage between the rubber and the belt. Since the rubber is formed in a plate shape and attached to the outer circumferential surface of the pulley, the rubber is worn by the friction between the rubber and the belt, and there is a problem in that the pulley is frequently replaced due to the wear of the rubber.

In addition, the frequent changes of the pulleys resulted in a decrease in productivity and the cost of the frequent replacement of the pulleys.

In addition, due to the rigidity of the pulley (pulley) there is a problem that the spindle does not fit well even when trying to insert between the hollow of the pulley (pulley).

In the prior art Patent No. 10-0907186 (belt conveyor pulley) because the rubber (rubber) is attached to the outer peripheral surface of the pulley (pulley) is used, the rubber (rubber) is worn by the friction between the rubber (rubber) and the belt, Due to the wear of the (rubber), there is a problem that the pulley (pulley) must be replaced frequently, and there is a problem of a decrease in productivity and a cost consumption due to the frequent replacement of the pulley (barley), a number of slits formed on the outer peripheral surface However, the method of installing a rubber that protrudes to the outside through the slit and catches the slit, but the locking jaw is formed to catch the slit, but can control the degree of loose and stiffness according to the dimensional deviation At this level, there is no pulley.

In order to solve the above problems, the technical problem to be achieved in the present invention is to solve the error caused by the dimensional deviation which is a problem that can occur when inserting the pulley (pulley) of the spindle part in the outer peripheral portion of the pulley (pulley) By forming a slit to give a tension between the slit and the central hole, the structure of the pulley (pulley) capable of controlling the indentation strength and the pulley (pulley) formed as such.

The present invention devised to achieve the above technical problem, in the pulley (pulley) having a slit, a central hole formed in a cylindrical shape; Ribs protruding from the inner circumferential surface of the first hole and the second slit symmetrically arcuately formed between the center hole and the outer circumferential surface of the pulley and the pulleys formed at positions corresponding to the first and second slit. It provides a pulley having a slit characterized in that it comprises a (rib). The pulley having the slit having such a configuration forms an slit between the center hole and the outer circumferential surface of the pulley, thereby controlling the indentation strength according to the dimensional deviation, thereby improving the indentation strength of the spindle.

According to one embodiment of the present invention, by forming a slit between the central hole and the outer peripheral surface of the pulley it is possible to improve the indentation strength of the spindle by adjusting the indentation strength according to the dimensional deviation.

According to the structure of the pulley formed with a slit according to an embodiment of the present invention, a space for contraction and expansion is formed between the inner and outer peripheral surfaces of the pulley to form a structure of the pulley that can contract and relax when assembling and separating the pulley. can do.

The effects of the present invention are not limited to the above-described effects, but should be understood to include all the effects deduced from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a perspective view showing the shape of a pulley before and after improvement.

2 is a perspective view illustrating a structure of a pulley according to an embodiment of the present invention.

3 is a plan view of a pulley according to another embodiment of the present invention.

4 is a cross-sectional view of a pulley according to another embodiment of the present invention.

5 is a plan view of a pulley according to another embodiment of the present invention.

6 is a cross-sectional view of a pulley according to another embodiment of the present invention.

7 is a view showing an indentation load measuring apparatus according to an embodiment of the present invention.

8 is a graph showing the experimental results of the indentation load according to an embodiment of the present invention.

9 is a graph showing the experimental results of the indentation load according to another embodiment of the present invention.

In order to achieve the above technical problem, an embodiment of the present invention, a pulley (pulley) having a slit, the central hole formed in the shape of a cylinder; Ribs protruding from the inner circumferential surface of the first hole and the second slit symmetrically arcuately formed between the center hole and the outer circumferential surface of the pulley and the pulleys formed at positions corresponding to the first and second slit. It provides a pulley having a slit including (rib).

In an embodiment of the present invention, the distance between the first and second slits and the central hole may provide a pulley having a diameter of 1/10 to 1/2 of the diameter of the central hole.

In an embodiment of the present invention, the circumferential length of the first and second slits is to provide a pulley having a slit that is 1/16 to 1/4 of the total length of the circumference passing through the center of the first and second slits. Can be.

In an embodiment of the present invention, to provide a pulley further comprises a third, fourth slits having the same length and the same shape at a position rotated 90 ° with respect to the center of the rotation axis of the pulley the first and second slits. Can be.

In an embodiment of the present invention, the pulley may further include holes having the same shape as the center hole to the left and right sides of the first and second slits.

In an embodiment of the present invention, it is possible to provide a pulley further comprising first and second ribs protruding radially inward of the central hole.

In an embodiment of the present invention, the first and second ribs may provide a pulley including a center disposed in the first and second slits.

Hereinafter, with reference to the accompanying drawings will be described the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is "connected" to another part, it includes not only "directly connected" but also "indirectly connected" with another member in between. . In addition, when a part is said to "include" a certain component, this means that it may further include other components, without excluding the other components unless otherwise stated.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIGS. 1A to 1D, FIGS. 1A and 1B show shapes before and after improvement of a small pulley (hereinafter, referred to as a “small pulley” 100). 1 (c) and 1 (d) show a shape before and after improvement of a large pulley (hereinafter, referred to as 'large pulley', 100A).

Referring to FIGS. 1A to 1D, first and second slits symmetrically arcuately formed between a central hole 120 formed in a cylindrical shape, a center hole 120, and an outer circumferential surface of the pulley (pulley) are formed.

Ribs

122 and 124 protruding from the inner circumferential surface of the pulley (pulley) formed at the position corresponding to the (112, 114) and the first and second slits (112, 114).

It may further include first and second ribs protruding radially inward of the central hole.

The first and second ribs may be disposed at the center of the first and second slits.

1 (a) and (b), in the case of the small pulley 100, a hole 120 may be formed at the center thereof. Grooves may be formed in the center portion of the outer circumferential surface of the small pulley 100. 1 (a) and (b) may include a first outer peripheral portion 102 surrounding the central hole 120 and a second outer peripheral portion 104 surrounded by the outer peripheral surface.

The distance between the first and second slits and the central hole may be 1/10 to 1/2 of the diameter of the central hole 120. When the distance between the first and

second slits

112 and 114 and the center hole 120 is smaller than 1/10 of the diameter of the center hole, so that the distance to the center hole 120 is close, when the spindle 150 is inserted The first and

second slits

112 and 114 formed in the

pulleys

100 and 100A may be damaged. When the distance between the first and second slits and the center hole is greater than 1/2 of the diameter of the center hole 120, the effect of lowering the indentation strength of the spindle 150 is reduced, so that the first and

second slits

112 and 114 are separated. Despite the insertion, the insertion and removal operations of the spindle 150 do not proceed smoothly, and thus workability may be reduced.

The circumferential length of the first and second slits may be 1/16 to 1/4 of the entire length of the circumference passing through the center of the first and second slits. If the lengths of the arcs of the first and

second slits

112 and 114 are smaller than 1/16, the effect on the formation of the

slits

112 and 114 may be insignificant, thereby reducing the indentation strength reduction effect of the spindle 150. When the length of the circular arc including the

slits

112 and 114 is greater than 1/4, the distance between the first and

second slits

112 and 114 and the central hole 120 is close to the center hole 120 and the first and second slits. Cracks may occur between the 112 and 114 and may be broken.

The

ribs

122 and 124 may be formed at positions corresponding to the first and

second slits

112 and 114, and may protrude from the inner circumferential surfaces of the

pulleys

100 and 100A. The

ribs

122 and 124 may prevent the

pulleys

100 and 100A from being damaged due to the insertion of the spindle 150. For example, the

ribs

122 and 124 may be formed of an elastic material.

Referring to (c) and (d) of FIG. 1, the same principle may be applied to the pulley 100A. However, the large pulley 100A may further include

holes

132, 134, 136 and 138 having the same shape as the center hole 120 to the left and right sides of the first and

second slits

112 and 114. The

holes

132, 134, 136, and 138 may be formed at positions symmetrical with respect to the center hole 120. The

holes

132, 134, 136, and 138 may have the same shape and have the same size.

Figure 2 is a perspective view showing the structure of a pulley (pulley) according to an embodiment of the present invention.

Referring to FIG. 2, FIG. 2A is a perspective view of the small pulley 100, and FIG. 2B is a perspective view of the large pulley 100A.

In FIG. 2, two first and second arc-shaped shapes are formed between the central hole 120 penetrating the

pulleys

100 and 100A and the outer circumferential surfaces of the central hole 120 and the

pulleys

100 and 100A. Including a slit (112, 114), the first and second slits (112, 114) are formed in a position opposite to each other, the structure capable of reducing the indentation strength of the spindle 150 through the central hole (120) It can have

In the structure of the

pulleys

100 and 100A forming the

slits

112 and 114, the first and

second ribs

122 and 124 protruding from the central hole 120 are disposed between the first and

second slits

112 and 114. It may further include.

In addition, between the first outer circumferential portion 102 surrounding the central hole 120 and the second outer circumferential portion 104 including the outer circumferential surface, the thickness of the first outer circumferential portion 102 is greater than that of the second outer circumferential portion 104. Steps that become thinner than thickness are formed, and the first and

second slits

112 and 114 may be formed on the first outer circumferential surface of the first outer circumferential portion 102.

The first outer circumferential portion 102 may be 1/3 or less of the thickness of the second outer circumferential portion 104. When the thickness of the first outer circumferential portion 102 is thick, a large resistance force may be applied when the spindle 150 is inserted. The first and

second slits

112 and 114 may be formed on the outer circumferential surface of the first outer circumferential portion 102 to increase flexibility.

Another embodiment of FIG. 3 may include four

slits

112, 114, 116, 118 around the central hole 120. Four

slits

112, 114, 116, 118 may be formed at equal intervals about one circumference. The central hole 120 may include

ribs

122, 124, 126, and 128 for each slit. If

many slits

112, 114, 116, 118 are formed, the spindle 150 can be inserted with a smaller indentation strength. However, when the number of

slits

112, 114, 116, and 118 increases, the number of maneuvers increases, the moment (torque) is weakened, and the risk of breakage may increase.

The second outer circumferential portion 104 of the large pulley 100A further includes

holes

132, 134, 136, and 138 formed in the same shape as the central hole 120 with the first and

second slits

112 and 114 at the center thereof. It may be to include.

In the same principle, as shown in FIG. 3 in the large pulley 100A, even when there is no stepped pulley, the holes formed in the same shape as the center hole 120 with the first and

second slits

112 and 114 interposed therebetween ( 132, 134, 136, 138). The formation of these

holes

132, 134, 136, 138 may lower the indentation strength of the spindle 150.

Referring to FIG. 4, the outer circumferential surface may have a groove formed in the center portion thereof. Without the

slits

112, 114, 116, and 118 surrounding the central hole 120, pressure may be applied to the shaft during the extrusion process, thereby affecting the shape of the product.

Referring to FIG. 5, the center hole 120 may be disposed in the center and four

slits

112, 114, 116, and 118 may be formed. Four

slits

112, 114, 116, 118 may be formed at equal intervals on one circumference.

The inner circumferential surface of the central hole 120 facing the

slits

112, 114, 116, and 118 may include first, second, third, and

fourth ribs

122, 124, 126, and 128. Another embodiment of the invention may be a small pulley with a stepped pulley.

Referring to FIG. 6, a groove G may be formed on an outer circumferential surface of the small pulley 100.

The second outer circumferential portion 104 may be formed on the left and right sides of the groove. The first outer circumferential portion 102 may be exposed to the outside.

{Experimental example}

Referring to FIG. 7, when the small pulley 100 and the spindle 150 are coupled to each other by pushing a certain distance by pushing the push pull stand, which is an indentation load measuring device, the load is measured. The right side shows an enlarged view of the spindle 150.

8 and 9 are graphs showing the results of indentation strength measurement according to an embodiment of the present invention.

Indentation strength is measured when the pulley (100, 100A) and the spindle 150 is coupled to the push-pull stand by a certain distance in the combined state, the load is applied. In FIG. 8 and FIG. 9, the X axis represents displacement, and the Y axis represents load. Since the displacement, which is the X axis, represents the displacement of the spindle 150 over time, the left side may be referred to as the load according to the initial displacement, and the right side may be referred to as the load applied after the entry.

Indentation testers can be used to measure such indentation strength. As an example of the indentation tester described above, a push pull stand may be used.

Indentation strength can be measured by the following process. The motor is stable to external load and overload, and can use AC servo motor that can control precisely. This configuration eliminates potential hazards such as external vibrations in the field.

The load sensor is a cylinder (in the experimental example of the present invention, the spindle 150 may correspond to this). When the pressure sensor is pressed in, a displacement proportional to the indentation load occurs, and the deformation gauge built into the load sensor according to this deformation. The electrical resistance of can change. According to such a change in electrical resistance, the current flowing in the end may change.

Indentation strength measurement experiment according to an embodiment of the present invention can calculate the load by inverting the change in current as described above to the change in displacement. These results can be seen through a program embedded in the indentation tester (not shown), but the detailed details will be omitted.

Referring to FIG. 8, it can be seen that the initial pull load of the small pulley 100 is lower than that of the conventional pulley, and the load is lower again after the entry. 8A shows the degree to which the load is lowered after entry in the small pulley 100.

Referring to FIG. 9, it can be seen that the large pulley 100A has a lower initial entry load and a lower load after entry as compared with the conventional pulley.

In the case of the large pulley 100A, although not shown, when the conventional spindle 150 is loose, it was confirmed that the entry load is increased and improved. Such details can be confirmed in the case of Sample 4 in Table 1 below.

Table 1 below is a table showing the maximum load value for each case of the small pulley and large pulley.

최대 하중Load	소 풀리(100)Cattle Pulley (100)		대 풀리(100A)Large pulley (100A)
	종래Conventional	실시예Example	종래Conventional	실시예Example
시료 1Sample 1	27.7N27.7 N	14.5N14.5N	22N22N	15.7N15.7 N
시료 2Sample 2	37.2N37.2 N	11.4N11.4 N	26.9N26.9 N	17.6N17.6N
시료 3Sample 3	21N21N	12.2N12.2N	22.1N22.1N	17.6N17.6N
시료 4Sample 4	20.5N20.5N	14.2N14.2N	4.7N4.7 N	15.6N15.6N
평균Average	26,6N26,6N	13.1N13.1 N	19.0N19.0N	16.6N16.6N

As can be seen in Table 1, in the case of the

pulleys

100 and 100A, the indentation strength is reduced by adding the

slits

112, 114, 116 and 118 to improve the load characteristics of the

pulleys

100 and 100A. Can be.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is represented by the following claims, and it should be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalents are included in the scope of the present invention.

[Description of the code]

100: small pulley 102: first outer portion

104: second outer periphery 112: first slit

114: second slit 120: central hole

122: first rib 124: second rib

132: first hole 134: second hole

136: third hole 138: fourth hole

150: spindle 100A: stand pulley

Claims

In a pulley having a slit,

A central hole formed in a cylindrical shape;

First and second slits symmetrically arcuately formed between the central hole and an outer circumferential surface of the pulley, and

And a rib protruding from an inner circumferential surface of a pulley formed at a position corresponding to the first and second slits.
The method of claim 1,

The distance between the first and second slits and the central hole is a pulley having a slit, characterized in that 1/10 to 1/2 of the diameter of the central hole.
The method of claim 1,

The circumferential length of the first and second slits is 1/16 to 1/4 of the entire length of the circumference passing through the center of the first and second slits.
The method of claim 1,

And a third and fourth slits having the same length and the same shape at a position where the first and second slits are rotated by 90 ° with respect to the center of the rotation axis of the pulley.
The method of claim 1,

And a plurality of holes having the same shape as the center hole to the left and right sides of the first and second slits.
The method of claim 1,

A pulley having a slit formed, characterized in that it further comprises first and second ribs projecting radially inward of the central hole.
The method of claim 6,

And the first and second ribs are formed at the center of the first and second slits.