A key connection failure inspection tool and inspection method

Abstract

The present invention discloses an inspection tool, comprising a stepped key and a pointer radially arranged along a transmission member, wherein the stepped key comprises a key body and a stepped platform fixed at one end of the key body, the key body can be embedded in a keyway of the transmission member and a keyway on a shaft, and the stepped platform is exposed in the keyway of the transmission member and the keyway on the shaft; the pointer is mounted on the stepped platform, and the length of the stepped platform can make a distance between the pointer and the outer edge of the transmission member, and a reference point is made on the outer edge of the transmission member, and the reference point corresponds to the needle tip of the pointer. The inspection tool of the present invention is simple to manufacture and low in cost, and the inspection method is easy to operate and accurate and intuitive, and is easy to promote and apply in this field.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical equipment, and in particular to a key connection failure inspection tool and inspection method. Background Art

[0002] In industrial production, mechanical transmission is the main way to transmit power for equipment, and there are many forms. However, no matter what kind of transmission, it is inseparable from the rotating unit, and the key connection in the rotating unit is indispensable. In practical applications, different key connection types are selected according to the transmitted torque and component size. There are four forms: flat key, semicircular key, tangential key and wedge key, but their ultimate function is that the transmission parts on the shaft do not move relative to each other in the circumferential direction during the power transmission process. The working surfaces of different forms of keys are different. For example, the wedge key uses the friction between the upper and lower surfaces of the key and the transmission part to form an integral motion unit, and the flat key uses the friction between the left and right sides of the key and the transmission part to transmit power, etc. It can be seen from this that if there is a gap on the working surface of the key, it may cause the key to collapse and fail, resulting in the disconnection of the power transmission chain, the inability of the equipment to work, and economic losses are inevitable. Even some special equipment will induce safety accidents. Take the key collapse of the main span crane drum of Yinshan Steel Plant of Shandong Iron and Steel Group Laiwu Branch as an example. Since the key collapse was not discovered and repaired in time in the early stage, the drum and drive shaft were scrapped and replaced, forcing the production line to be slowed down. In addition, five crane drums were scrapped due to keyway collapse within one year, causing great economic losses to the company.

[0003] The failure of key crushing is a slow gradual process. First, the working surface of the key and the transmission part slides relative to each other under the action of alternating loads, resulting in a small gap. At this stage, the shaft and the transmission part will have relative circumferential deflection, especially when the rotation starts or stops. This period is the golden stage for dealing with key failure problems. Whether it is online or offline maintenance, only the key itself is repaired. It only needs to be re-matched and installed according to the keyway size of the shaft and the transmission part according to the technical requirements after the planned shutdown, and it can continue to be used. However, if it is not discovered in time at the initial stage, the gap between the key working surface and the transmission part will gradually increase, and the keyway on the shaft and the transmission part will also deform to a certain extent. The key will be instantly crushed by the sudden load, causing the shaft and the transmission part to be scrapped. It can be seen that the measures to prevent such accidents include not only the correct selection of key types, sizes and materials, but also the identification of the early stage of key failure to make up for the deficiencies in design and installation, timely discover hidden dangers and eliminate the source of failure. However, it is now impossible to make accurate judgments at the beginning of hidden dangers, which is a blind spot in the control of equipment operation status. Summary of the invention

[0004] In view of the above-mentioned prior art, the purpose of the present invention is to provide an inspection tool and method for key connection failure. Through the present invention, accurate judgment can be made in the early stage of key failure of rotating equipment, the degradation trend of equipment can be grasped, and appropriate remedial measures can be taken, thereby ensuring the safe production of the enterprise and having important significance for reducing the economic losses of enterprise production.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] According to a first aspect of the present invention, there is provided an inspection tool, comprising a step key and a pointer radially arranged along a transmission member, wherein the step key comprises a key body and a step platform fixed at one end of the key body, the key body being capable of being embedded in a keyway of the transmission member and a keyway on a shaft, and the step platform being exposed in the keyway of the transmission member and the keyway on the shaft; the pointer is mounted on the step platform, the length of the step platform being capable of ensuring a distance between the pointer and an outer edge of the transmission member, and a reference point being made on the outer edge of the transmission member, the reference point corresponding to the tip of the pointer.

[0007] Preferably, the pointer is threadedly connected to the stepped platform.

[0008] Preferably, a threaded hole is provided on the step platform, a thread matching the threaded hole is provided on the fixed end of the pointer, and after the pointer is threadedly connected to the threaded hole, a locking nut is connected to the pointer to lock the pointer.

[0009] Preferably, the length of the pointer does not exceed the maximum rotation radius of the transmission member.

[0010] Preferably, the height of the step platform is less than half of the height of the key body and can meet the fixing strength requirement of the pointer.

[0011] Preferably, the transmission member is a wire rope drum.

[0012] Preferably, the pointer is made of spring steel, which has good elasticity and is not prone to plastic deformation, to prevent the pointer from colliding with other objects during rotation and causing deformation and failure.

[0013] A second aspect of the present invention provides the use of the above-mentioned inspection tool in key connection failure inspection work.

[0014] Preferably, the key connection is specifically a key connection for a transmission member with a low rotation speed and heavy alternating load.

[0015] A third aspect of the present invention provides a method for checking key connection failure, comprising the following steps:

[0016] (1) Install the key body of the above-mentioned inspection tool step key into the keyway of the transmission part and the keyway on the shaft;

[0017] (2) Install the pointer on the stepped platform of the stepped key and make a reference point on the outer edge of the transmission member, the reference point corresponding to the tip of the pointer;

[0018] (3) Under normal circumstances, the pointer and the transmission part rotate synchronously, and there will be no offset between the pointer and the reference point. When there is a small gap between the working surface of the step key and the transmission part rotates, the two will not rotate synchronously, and the step key will lag behind by an angle. At this time, the tip of the pointer will be offset from the reference point. The longer the pointer is, the more obvious the offset will be. When the transmission part starts or stops rotating and the pointer is observed to stutter, it shows that the role of the step key in transmitting torque has begun to weaken, and the step key needs to be replaced.

[0019] Beneficial effects of the present invention:

[0020] 1. The inspection tool and inspection method of the present invention can make accurate judgments in the early stage of key failure of rotating equipment, grasp the deterioration trend of equipment, and take appropriate remedial measures, thereby ensuring the safe production of the enterprise and having important significance for reducing the economic losses of enterprise production.

[0021] 2. The inspection tool of the present invention is simple to manufacture and low in cost. The inspection method is convenient to operate and is accurate and intuitive, which is convenient for promotion and application in this field. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the inspection tool of the present invention;

[0023] Figure 2 It is a schematic structural diagram of the step key of the present invention;

[0024] Figure 3 It is a schematic diagram of the installation structure of the present invention.

[0025] In the figure: 1. pointer, 2. key body, 3. step platform, 4. threaded hole, 5. locking nut, 6. reference point, 7. wire rope drum. DETAILED DESCRIPTION

[0026] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0027] As introduced in the background technology section, in the key connection of rotating equipment, if there is a gap on the working surface of the key, it may cause the key to collapse and fail, resulting in the disconnection of the power transmission chain and the inability of the equipment to work. Economic losses are inevitable, and even some special equipment may induce safety accidents. At present, it is impossible to make an accurate judgment on the early stage of key connection failure.

[0028] Based on this, the inspection tool and inspection method of the present invention can make accurate judgments in the early stage of key failure of rotating equipment, grasp the equipment degradation trend, and take appropriate remedial measures, thereby ensuring the safe production of the enterprise and having important significance for reducing the economic losses of enterprise production.

[0029] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the technical solution of the present application will be described in detail below in conjunction with specific embodiments.

[0030] The test materials used in the examples of the present invention are all conventional test materials in the art and can be purchased through commercial channels.

[0031] Example 1

[0032] The inspection tool of the present invention comprises a stepped key and a pointer 1 arranged radially along a transmission member. The stepped key comprises a key body 2 and a stepped platform 3 fixed at one end of the key body 2, the key body 2 can be embedded in the keyway of the transmission member and the keyway on the shaft, and the stepped platform 3 is exposed in the keyway of the transmission member and the keyway on the shaft.

[0033] The pointer 1 is installed on the step platform 3. Specifically, the pointer 1 is threadedly connected to the step platform 3. A threaded hole 4 is set on the step platform 3. A thread matching the threaded hole 4 is set at the fixed end of the pointer 1. After the pointer 1 is threadedly connected to the threaded hole 4, a locking nut 5 is connected to the pointer 1, and the pointer 1 is locked by the locking nut 5.

[0034] The height h of the step platform 3 is less than half of the height H of the key body 2, and can meet the fixing strength requirements of the pointer 1. The length L of the step platform 3 can make the pointer 1 have a distance from the outer edge of the transmission part, and the length of the pointer 1 does not exceed the maximum rotation radius of the transmission part. A reference point 6 is made on the outer edge of the transmission part, and the reference point 6 corresponds to the tip of the pointer 1. The inspection tool utilizes the principle that the larger the circle diameter, the larger the line distance when the same angle deflection. Under normal circumstances, the pointer 1 rotates synchronously with the transmission part, and there will be no offset between the pointer 1 and the reference point 6. When there is a small gap on the working surface of the step key, when the transmission part rotates driven by the power system, the two will not rotate synchronously, the step key will lag behind by an angle, and the tip of the pointer 1 will be offset from the reference point 6. The longer the length of the pointer 1, the more obvious the offset. When the pointer 1 is observed to be frustrated, it shows that the role of the step key in transmitting torque begins to weaken, and it needs to be replaced at an appropriate time.

[0035] In this embodiment, the transmission member is a wire rope drum 7. The pointer 1 is made of spring steel. The pointer 1 is made of spring steel with good elasticity and not prone to plastic deformation, so as to prevent the pointer 1 from colliding with other objects during rotation and deforming and failing.

[0036] A method for checking failure of a crane wire rope drum key connection comprises the following steps:

[0037] (1) Install the key body 2 of the step key of the inspection tool into the keyway of the wire rope drum 7 and the keyway on the shaft;

[0038] (2) Install the pointer 1 on the stepped platform 3 of the stepped key, and make a reference point 6 on the outer edge of the transmission member, the reference point 6 corresponding to the tip of the pointer 1; the reference point 6 is made with a flat shovel;

[0039] (3) Under normal circumstances, the pointer 1 rotates synchronously with the wire rope drum 7, and there will be no offset between the pointer 1 and the reference point 6. Based on the principle that the larger the circle diameter, the larger the linear distance, when there is a small gap between the working surface of the step key and the wire rope drum 7 rotates, the two will not rotate synchronously, and the step key will lag behind by an angle. At this time, the pointer 1 will be offset from the reference point 6. The longer the pointer 1 is, the more obvious the offset will be. When the wire rope drum 7 starts or stops rotating, if the pointer 1 is observed to be jerked, it means that the torque transmission effect of the step key begins to weaken, and the step key needs to be replaced at an appropriate time.

[0040] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An inspection tool, characterized in that: The invention comprises a stepped key and a pointer (1) arranged radially along a transmission member, wherein the stepped key comprises a key body (2) and a stepped platform (3) fixed at one end of the key body (2), wherein the key body (2) can be embedded in a keyway of the transmission member and a keyway on a shaft, and the stepped platform (3) is exposed outside the keyway of the transmission member and the keyway on the shaft; the pointer (1) is mounted on the stepped platform (3), and the length of the stepped platform (3) can ensure that there is a distance between the pointer (1) and the outer edge of the transmission member, and a reference point (6) is made on the outer edge of the transmission member, and the reference point (6) corresponds to the needle tip of the pointer (1); The pointer (1) is threadedly connected to the stepped platform (3); The length of the pointer (1) does not exceed the maximum rotation radius of the transmission member.

2. The inspection tool according to claim 1, characterized in that: A threaded hole (4) is provided on the step platform (3), a thread matching the threaded hole (4) is provided on the fixed end of the pointer (1), and after the pointer (1) is threadedly connected to the threaded hole (4), a locking nut (5) is connected to the pointer (1).

3. The inspection tool according to claim 1, characterized in that: The height of the stepped platform (3) is less than half the height of the key body (2) and can meet the fixing strength requirement of the pointer (1).

4. The inspection tool according to claim 1, characterized in that: The transmission member is a wire rope drum (7).

5. Use of the inspection tool according to any one of claims 1 to 4 in key connection failure inspection work.

6. A method for checking key connection failure, characterized in that: The steps include: 1) Installing the key body (2) of the inspection tool step key according to any one of claims 1 to 4 into the keyway of the transmission part and the keyway on the shaft; 2) Mounting the pointer (1) on the stepped platform (3) of the stepped key, making a reference point (6) on the outer edge of the transmission member, the reference point (6) corresponding to the needle tip of the pointer (1); 3) Under normal circumstances, the pointer (1) rotates synchronously with the transmission part, and there is no offset between the pointer (1) and the reference point (6); when there is a small gap on the working surface of the step key, the two will not rotate synchronously when the transmission part rotates, and the step key will lag behind by an angle. At this time, the tip of the pointer (1) will be offset from the reference point (6). The longer the pointer (1), the more obvious the offset. When the pointer (1) is observed to stutter when the transmission part starts or stops rotating, it shows that the function of the step key in transmitting torque has begun to weaken, and the step key needs to be replaced.

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