A method for measuring the diameter of pulley rope groove

Abstract

The present invention relates to a pulley, and in particular to a method for measuring the diameter of a pulley rope groove, comprising a measuring tool, the measuring tool comprising at least one measuring ruler for measuring the diameter of a pulley rope groove in a pulley, the measuring ruler comprising a gripping portion and a measuring portion, the measuring portion being a circular arc plate connected to one end of the gripping portion, the diameter of the circular arc plate being 104% of the nominal diameter of a steel wire rope wound on the pulley, the circular arc plate being provided with four oblique lines oriented toward the center of a circle and symmetrical to each other in pairs, the outer two oblique lines symmetrical to each other being first scale lines, the two first scale lines having an included angle of 120°, the inner two oblique lines symmetrical to each other being second scale lines, the two second scale lines having an included angle of 90°; the measuring method is as follows: the measuring portion is fitted with the bottom of the pulley rope groove, the range of the fitting surface of the measuring portion and the pulley rope groove coincides with the range sandwiched by the first scale lines and the second scale lines, and the pulley rope groove matches the steel wire rope.

Description

Technical Field

[0001] The invention relates to a pulley, in particular to a method for measuring the diameter of a pulley rope groove. Background Art

[0002] A pulley is a circular wheel with grooves around its periphery that can rotate around an axis. A simple machine that can rotate around a central axis is called a pulley, which is composed of a circular wheel with grooves that can rotate around a central axis and a flexible rope (rope, tape, steel cable, chain, etc.) that crosses the circular wheel. There are grooves on the circumference of the circular wheel. Wrap the rope around the grooves and pull either end of the rope. The friction between the rope and the circular wheel will cause the circular wheel to rotate around the central axis. The grooves on the circumference of the circular wheel are called pulley rope grooves. The pulley is actually a deformable, rotatable lever. The main functions of a pulley are to pull loads, change the direction of force, transmit power, etc. A machine composed of multiple pulleys is called a "pulley block" or "compound pulley". The mechanical advantage of a pulley block is large and can pull heavier loads. A pulley can also be a component of a chain drive or a belt drive, transmitting power from one rotating shaft to another.

[0003] Pulleys are also commonly used on trolleys and hoisting equipment. The wire rope is wound around the pulley. When the lifting mechanism is in motion, the wire rope rotates with the pulley to make the hoisting equipment move up and down. When the pulley rope groove diameter of the selected pulley does not match the diameter of the wire rope or the pulley rope groove diameter deepens the groove due to wear and tear of the pulley, resulting in a reduction in the pulley rope groove diameter, when the pulley rope groove diameter is reduced to a point where it does not match the wire rope diameter, it will cause the wire rope to be blocked. Continuing to use it will cause wire breakage and loose strands, affecting the service life of the wire rope and even forming a safety hazard; or if the pulley rope groove diameter of the selected pulley is larger than the wire rope diameter, it will cause the wire rope to wear faster, thus affecting the service life of the wire rope. Therefore, matching the pulley rope groove diameter of the pulley with the actual diameter of the wire rope is an important indicator to ensure the stable operation of the pulley device and the safe and stable operation of the wire rope. Usually, because the actual size of the wire rope is 2% to 4% larger than the nominal diameter, how to match the actual size of the wire rope with the pulley rope groove diameter is an urgent problem to be solved. Since the pulley groove diameter is inconvenient to measure or the measurement accuracy is low, there is currently no tool or method specifically used to measure the pulley groove diameter. The operator can only measure the wire rope diameter and then judge by feeling whether the wear degree of the pulley groove diameter is suitable and matches the wire rope diameter, and then decide whether the pulley needs to be replaced. This method has extremely strong uncertainty, requires high experience from the operator, and is prone to misjudgment, resulting in a mismatch between the pulley groove diameter and the wire rope diameter, which affects the service life of the wire rope and even causes safety hazards.

[0004] Therefore, there is an urgent need for a method for measuring the diameter of a pulley rope groove to measure the diameter of the pulley rope groove to solve the problem that the pulley rope groove diameter does not match the wire rope diameter. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a method for measuring the diameter of a pulley rope groove, which is used to measure the diameter of the pulley rope groove to solve the problem that the pulley rope groove diameter does not match the wire rope diameter.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A method for measuring the diameter of a pulley rope groove, comprising a measuring tool, the measuring tool comprising at least one measuring ruler for measuring the diameter of the pulley rope groove in the pulley, the measuring ruler having a gripping portion and a measuring portion, the measuring portion being an arc plate connected to one end of the gripping portion, the diameter of the arc plate being 104% of the nominal diameter of a steel wire rope wound on the pulley, the arc plate being provided with four oblique lines oriented toward the center of the circle and symmetrical to each other in pairs, the outer two oblique lines symmetrical to each other being first scale lines, the angle between the two first scale lines being 120°, the inner two oblique lines symmetrical to each other being second scale lines, the angle between the two second scale lines being 90°;

[0008] The measurement method is as follows:

[0009] The measuring part is made to fit with the bottom of the pulley rope groove, and the range of the fitting surface between the measuring part and the pulley rope groove coincides with the range between the first scale line and the second scale line, so that the pulley rope groove matches the diameter of the wire rope;

[0010] If the fitting range between the measuring part and the pulley rope groove exceeds the range between the two first scale lines, the diameter of the pulley rope groove is too small, and a pulley with a larger pulley rope groove diameter needs to be replaced;

[0011] If the range of the fitting surface between the measuring portion and the pulley rope groove is smaller than the range sandwiched by the two second scale lines, the diameter of the pulley rope groove is too large, and a pulley with a smaller pulley rope groove diameter needs to be replaced.

[0012] Furthermore, a hanging hole is provided at one end of the holding portion away from the measuring portion.

[0013] Furthermore, the measuring rulers in the measuring tool are connected via the hanging holes.

[0014] Furthermore, the central angle corresponding to the arc length of the arc plate is 120°~180°.

[0015] The beneficial effects of the present invention are:

[0016] The present invention provides a method for measuring the diameter of a pulley rope groove. By fitting a measuring ruler whose measuring part is an arc plate with the bottom of the pulley rope groove, and by whether the fitting surface of the measuring part and the pulley rope groove coincides with the range sandwiched by two mutually symmetrical scale lines on the measuring part, it can be judged whether the diameter of the pulley rope groove matches the actual diameter of the wire rope corresponding to the measuring ruler; and the present invention can also measure the worn pulley rope groove. If the measuring part can clean the oil stain at the bottom of the pulley rope groove, it means that the measuring part is tightly fitted with the bottom of the pulley rope groove, that is, the diameter of the pulley rope groove of the pulley still matches the diameter of the wire rope. If it cannot be cleaned, it does not match, and a new pulley needs to be replaced. The present invention provides a method for measuring the diameter of a pulley rope groove. The measuring tool used is simple, the measuring method is fast and simple, and the problem of inconvenient measurement of the pulley rope groove diameter is solved, thereby solving the problem of mismatch between the pulley rope groove diameter and the wire rope diameter, and avoiding a series of problems caused by mismatch between the pulley rope groove diameter and the wire rope diameter.

[0017] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0019] Figure 1 It is a structural schematic diagram of a measuring ruler in an embodiment;

[0020] Figure 2 Schematic diagram of the use status of the measuring ruler in the embodiment.

[0021] Reference numerals: pulley 1 , first scale line 2 , pulley rope groove 3 , measuring ruler 4 , gripping portion 41 , measuring portion 42 , hanging hole 43 , second scale line 5 . DETAILED DESCRIPTION

[0022] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0023] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0024] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] See also Figure 1-2 , is a measuring tool for measuring the diameter of a pulley rope groove, the measuring tool comprising at least one measuring ruler 4 for measuring the diameter of a pulley rope groove 3 in a pulley 1, the measuring ruler 4 having a gripping portion 41 and a measuring portion 42, the measuring portion 42 being an arc plate connected to one end of the gripping portion 41, the diameter of the arc plate being 104% of the nominal diameter of a steel wire rope wound around the pulley, the arc plate being provided with four oblique lines symmetrical to each other in pairs and symmetrical along the vertical center line of the arc plate, the two outer oblique lines symmetrical to each other being first scale lines 2, the angle between the two first scale lines 2 being 120°, the two inner oblique lines symmetrical to each other being second scale lines 5, the angle between the two second scale lines 5 being 90°.

[0026] In this embodiment, a hanging hole 43 is provided at one end of the gripping portion 41 away from the measuring portion 42. The measuring rulers 4 in the measuring tool are connected via the hanging hole 43.

[0027] The central angle corresponding to the arc length of the arc plate is 120°~180°. Preferably, the central angle corresponding to the arc length of the arc plate is 130°.

[0028] A method for measuring the diameter of a pulley rope groove, the specific method is as follows:

[0029] The measuring portion 42 is fitted with the bottom of the pulley rope groove 3, and the range of the fitting surface between the measuring portion 42 and the pulley rope groove 3 coincides with the range between the first scale line 2 and the second scale line 5, so that the pulley rope groove 3 matches the diameter of the wire rope;

[0030] If the fitting range of the measuring portion 42 and the pulley rope groove 3 exceeds the range sandwiched by the two first scale lines 2, the diameter of the pulley rope groove is too small, and a pulley with a larger pulley rope groove diameter needs to be replaced;

[0031] If the range of the fitting surface of the pulley rope groove 3 of the measuring part 42 is smaller than the range between the two second scale lines 5, the diameter of the pulley rope groove is too large, and a pulley with a smaller pulley rope groove diameter needs to be replaced.

[0032] In the specific measurement process, the following methods are used to determine whether the bonding surface is tightly bonded:

[0033] The measuring part 42 is made to fit with the pulley rope groove 3, and the oil stains at the bottom of the pulley rope groove 3 are cleaned by the measuring part 42. If the oil stains are cleaned, it can be determined that the fitting surface of the measuring part 42 and the pulley rope groove 3 at the corresponding position is tightly fitted;

[0034] If the oil stains are not cleaned up, the fitting surface between the measuring portion 42 and the pulley rope groove 3 at the corresponding position will not be tight.

[0035] The method for measuring the diameter of a pulley rope groove provided in this embodiment can quickly and conveniently measure whether the diameter of the pulley rope groove matches the diameter of the wire rope, thereby solving the problem of measuring the diameter of the pulley rope groove. Moreover, the method has been used in actual production, and the measurement accuracy can meet the requirements for the use of wire ropes.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A method for measuring the diameter of a pulley rope groove, characterized in that: The measuring tool comprises at least one measuring ruler (4) for measuring the diameter of a pulley rope groove (3) in a pulley (1), the measuring ruler (4) comprising a gripping portion (41) and a measuring portion (42), the measuring portion (42) being a circular arc plate connected to one end of the gripping portion (41), the diameter of the circular arc plate being 104% of the nominal diameter of a steel wire rope wound on the pulley, the circular arc plate being provided with four oblique lines oriented toward the center of the circle and symmetrical to each other, the two outer oblique lines symmetrical to each other being first scale lines (2), the angle between the two first scale lines (2) being 120°, the two inner oblique lines symmetrical to each other being second scale lines (5), the angle between the two second scale lines (5) being 90°; The measurement method is as follows: The measuring portion (42) is fitted with the bottom of the pulley rope groove (3), and the range of the fitting surface between the measuring portion (42) and the pulley rope groove (3) coincides with the range between the first scale line (2) and the second scale line (5), so that the pulley rope groove (3) matches the diameter of the steel wire rope; If the range of the contact surface between the measuring portion (42) and the pulley rope groove (3) exceeds the range sandwiched by the two first scale lines (2), the diameter of the pulley rope groove is too small and a pulley with a larger pulley rope groove diameter needs to be replaced; If the range of the contact surface between the measuring portion (42) and the pulley rope groove (3) is smaller than the range between the two second scale lines (5), the diameter of the pulley rope groove is too large and a pulley with a smaller pulley rope groove diameter needs to be replaced.

2. A method for measuring the diameter of a pulley rope groove according to claim 1, characterized in that: A hanging hole (43) is provided at one end of the holding portion (41) away from the measuring portion (42).

3. A method for measuring the diameter of a pulley rope groove according to claim 2, characterized in that: The measuring rulers (4) in the measuring tool are connected via the hanging holes (43).

4. A method for measuring the diameter of a pulley rope groove according to claim 1, characterized in that: The central angle corresponding to the arc length of the arc plate is 120°~180°.

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