Special tool for taking out pulley piece bearing for crane

Abstract

The invention belongs to the technical field of tools and instruments for dismounting and assembling parts of hoisting mechanical equipment, and particularly discloses a special tool for taking out a pulley piece bearing for a crane, the special tool comprises a clamping frame and an overturning lever pin shaft, the clamping frame is detachably fixed on the peripheral surface of a pulley hub of a pulley piece; the overturning lever pin shaft comprises a pin shaft body and a lever head, the lever head and one end of the pin shaft body are integrally formed, the geometric shape of the lever head can be inserted into an operation gap formed between bearing outer rings of a first bearing and a second bearing of the pulley piece, and the pin shaft body is rotationally connected to the clamping frame. According to the invention, field assembly and operation are facilitated, and the rolling body and the retainer are not damaged; the protective dismounting of the bearing is realized, secondary old utilization is facilitated, and the purchase cost of spare parts is reduced.

Description

Technical Field

[0001] This invention relates to the field of tools and implements for disassembling and assembling components of crane machinery and equipment, and in particular to a special tool for removing pulley bearings for cranes. Background Technology

[0002] The hoisting mechanism of a bridge crane is primarily composed of movable and fixed pulleys. These pulley systems act as decelerators and reduce effort. The wire rope, after passing through the complex winding sequence of the pulley system, is ultimately fixed at both ends to the drum surface. As the hoisting mechanism ascends and descends, the wire rope is wound and unwound on the drum after passing through the pulley system, thus achieving the lifting and lowering of the load. Due to repeated contact and friction between the wire rope and the pulley grooves, relative wear on both the pulley grooves and the wire rope is inevitable. Therefore, the wire rope and pulleys need to be replaced periodically. Once the wire rope wears to its end-of-life condition, it can be scrapped. However, if the pulley grooves are worn to the standard but the bearings have not yet reached the scrapping standard, the pulley bearings need to be protectively removed and reused to reduce unnecessary waste, improve the economic efficiency of bearing spare parts use, and lower maintenance costs.

[0003] There are three main situations in which pulley bearings can be reused: 1) When the pulley is abnormally damaged (rim breakage, spoke breakage), the bearing can be protectively removed and reused; 2) When the pulley groove is worn out and scrapped within the specified service life, but the bearing clearance does not meet the scrapping standard after testing, it can continue to be used; 3) When the pulley shaft is abnormally damaged, but the pulley needs to be removed and the bearing replaced with the pulley shaft.

[0004] Large crane pulleys typically use a double-row bearing structure. When the pulleys are removed and replaced for repair and assembly, the bearings need to be removed. Since the gap between the two rows of bearings is very small (only 12mm), conventional pry bars cannot be used. Therefore, on-site, destructive removal is often carried out by hammering or flame cutting. This is time-consuming and labor-intensive, and the bearings cannot be completely removed in a protective manner. Therefore, a special tool that can protectively remove the bearings of crane pulleys needs to be designed. Summary of the Invention

[0005] The purpose of this invention is to provide a special tool for removing crane pulley bearings, so as to solve the problem that existing crane pulley bearings cannot be removed protectively.

[0006] To achieve the above objectives, the basic solution provided by the present invention is as follows: a special tool for removing a pulley bearing for a crane, comprising a clamping frame and a flipping lever pin, wherein the clamping frame is detachably fixed to the outer peripheral surface of the pulley hub of the pulley; the flipping lever pin comprises a pin body and a lever head, wherein the lever head is integrally formed with one end of the pin body, and the geometry of the lever head is capable of being inserted into the operating gap formed between the outer rings of the first and second bearings of the pulley; the pin body is rotatably connected to the clamping frame.

[0007] Furthermore, the clamping frame includes an upper housing, a lower housing, and a connecting plate. One end of the upper housing and the lower housing are detachably connected by connecting bolts, and the other end of the upper housing and the lower housing are detachably connected to the connecting plate by connecting bolts. The pin body is rotatably connected to the connecting plate. The side of the upper housing and the lower housing connected to the connecting plate, as well as the connecting plate, are all arc-shaped, and the arc of the arc is the same as the outer arc of the pulley hub.

[0008] Furthermore, the lever head of the flip lever pin is a non-circular flat structure, the thickness of which is less than the axial width of the operating gap, and the width of which is greater than its thickness. This configuration creates an eccentric lever effect when the flip lever pin rotates.

[0009] Furthermore, there are two flip lever pins, namely a first flip lever pin and a second flip lever pin; the width of the lever head of the first flip lever pin is different from the width of the lever head of the second flip lever pin. The first and second flip lever pins are designed to rotate sequentially during the removal operation, thereby achieving a gradual ejection of the first bearing.

[0010] Furthermore, both the first and second flip lever pins are movably fitted with tightening nuts. The connecting plate has two threaded through holes, and the outer wall of the tightening nut is threadedly connected to these holes. The tightening nuts apply axial preload to the flip lever pins before rotation, preventing the lever head from slipping out of the operating clearance during rotation under load.

[0011] Furthermore, the space formed by the upper housing, lower housing, and connecting plate is the axial displacement space for the first and second bearings to completely retract from the pulley bearing holes; and the position of the connecting bolt corresponds to the position of the preset spoke holes on the pulley. Aligning these two positions facilitates centering and positioning during installation.

[0012] Furthermore, the flip lever pin is made of a high-hardness metal material that has undergone heat treatment, with a hardness range of HRC33 to HRC40; the edge of the lever head is rounded. The edge of the lever head is machined into a rounded transition to reduce rotational resistance and prevent scratching the surface of the outer ring when rotating into contact with the outer rings of the first and second bearings.

[0013] Compared with the prior art, the advantages of this invention are: 1. The special dismantling tool described in this invention should be easy to assemble and operate on site without damaging the rolling elements and cage; it should achieve protective dismantling of the bearing, facilitate secondary reuse, and reduce spare parts procurement costs.

[0014] 2. The special dismantling tool described in this invention was tested for protective dismantling of pulley bearings. The results showed that the special dismantling tool is easy to assemble on site and has good centering. The flat part of the flip lever pin head can accurately cut into the narrow gap between the two bearings, converting the lever prying force that cannot be applied vertically from the front into the horizontal prying force driven by the pin rotation, thus achieving the effect of protective dismantling of the bearings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the pulley plate with the bearing inner ring removed in this invention; Figure 2 This is a schematic diagram of the structure of a special tool for removing pulley bearings for cranes according to the present invention; Figure 3 for Figure 2 Sectional view of AA; Figure 4 This is a schematic diagram of the structure of the first flipping lever pin in a special tool for removing pulley bearings for cranes according to the present invention; Figure 5 This is a schematic diagram of the structure of the second flipping lever pin in a special tool for removing pulley bearings for cranes according to the present invention; Figure 6 This is a schematic diagram of the initial position of the outer ring of the bearing when the flipping lever pin is not rotated in a special tool for removing pulley bearings for cranes according to the present invention; Figure 7 This is a schematic diagram showing the position of the outer ring of the bearing when the flipping lever pin is rotated 90 degrees in a special tool for removing pulley bearings for cranes according to the present invention. Detailed Implementation

[0016] The present invention will be further described in detail below through specific embodiments: The reference numerals in the accompanying drawings include: clamping frame 1, upper housing 101, lower housing 102, connecting plate 103, connecting bolt 104; flip lever pin 2, first flip lever pin 201, second flip lever pin 202, pin body 203, lever head 204; pulley plate 3, pulley hub 301, first bearing 302, second bearing 303, bearing outer ring 304, rolling element 305, spoke hole 306, cage 307, expansion ring 308; tightening nut 4, operating clearance 5.

[0017] like Figures 1 to 7 As shown: A special tool for removing a crane pulley bearing includes a clamping frame 1 and a flipping lever pin 2. The clamping frame 1 is detachably fixed to the outer peripheral surface of the pulley hub 301 of the pulley 3. The flipping lever pin 2 includes a pin body 203 and a lever head 204. The lever head 204 is integrally formed with one end of the pin body 203. The geometry of the lever head 204 allows it to be inserted into the operating gap 5 formed between the bearing outer ring 304 of the first bearing 302 and the second bearing 303 of the pulley 3. The pin body 203 is rotatably connected to the clamping frame 1; there are two flip lever pins 2, namely the first flip lever pin 201 and the second flip lever pin 202; the width of the lever head 204 of the first flip lever pin 201 is different from the width of the lever head 204 of the second flip lever pin 202; a tightening nut 4 is movably sleeved on the pin body 203 of both the first flip lever pin 201 and the second flip lever pin 202, and the outer wall of the tightening nut 4 is threaded to the clamping frame 1. The lever head 204 of the flip lever pin 2 is a non-circular flat structure, the thickness of the flat structure is less than the axial width of the operating gap 5, and the width of the flat structure is greater than its thickness; the flip lever pin 2 is made of a high-hardness metal material that has undergone tempering and heat treatment, and its hardness ranges from HRC33 to HRC40; the edge of the lever head 204 is rounded.

[0018] The clamping frame 1 includes an upper housing 101, a lower housing 102, and a connecting plate 103. One end of the upper housing 101 and the lower housing 102 are detachably connected by connecting bolts 104, and the other end of the upper housing 101 and the lower housing 102 are detachably connected to the connecting plate 103 by connecting bolts 104. The pin body 203 is rotatably connected to the connecting plate 103. The side of the upper housing 101 and the lower housing 102 connected to the connecting plate 103, as well as the connecting plate 103, are all arc-shaped, and the arc of the arc is the same as the outer arc of the pulley hub 301. The connecting plate 103 has two threaded through holes, and the outer wall of the tightened nut 4 is threadedly connected to the threaded through holes. The space formed by the upper housing 101, the lower housing 102, and the connecting plate 103 is the axial displacement space for the first bearing 302 and the second bearing 303 to completely exit the pulley bearing hole. The position of the connecting bolt 104 corresponds to the position of the preset spoke hole 306 on the pulley plate 3. After the inner ring of the bearing is removed from the existing pulley plate 3, the pulley bearing hole also includes the outer ring 304, the expansion ring 308, the cage 307 and the rolling element 305.

[0019] The working principle of this embodiment is as follows: Bearing removal tool installation: Two sets of special bearing removal tools are symmetrically installed inside the pulley bearing hole. The specific installation steps are as follows: First, the worker removes the inner ring of the bearing from the pulley bearing hole. Then, the upper housing 101 and the lower housing 102 are placed on both sides of the pulley bearing hole, and the through holes on the upper housing 101 and the lower housing 102 are aligned with the secondary hole 306 on the pulley plate 3. Next, the upper housing 101 and the lower housing 102 are fixed to the pulley plate 3 using connecting bolts 104. Then, the lever head 204 of the first flip lever pin 201 and the lever head 204 of the second flip lever pin 202 are inserted into the pulley plate 3. Within the operating gap 5, the other ends of the upper housing 101 and the lower housing 102 are connected by connecting bolts 104 via connecting plate 103. At the same time, the pin body 203 of the first flip lever pin 201 and the pin body 203 of the second flip lever pin 202 pass through the threaded through holes on the connecting plate 103. Then, the two tightening nuts 4 are screwed into the two threaded through holes respectively. The end face of the tightening nuts 4 directly presses the pin body 203 of the first flip lever pin 201 and the pin body 203 of the second flip lever pin 202 against each other. Then, another bearing is symmetrically installed and the special tool is removed through the above steps.

[0020] Bearing removal process: After the two sets of special bearing removal tools are installed, the staff uses a wide wrench to first rotate the first flip lever pin 201 on both sides symmetrically. After the first flip lever pin 201 rotates 90 degrees, the staff continues to rotate the second flip lever pin 202 on both sides symmetrically until the first bearing 302 and the second bearing 303 are basically out of the pulley plate bearing hole, thus achieving the protective removal of the bearing.

[0021] Bearing removal tools: After all the bearings have been removed, the staff can remove the relevant components by reversing the installation steps.

[0022] If the bearing and the pulley bearing hole are too tight during the bearing removal process, the workers can take measures to slightly heat the outside of the pulley hub 301 (using flame or induction coil heating) to facilitate the bearing removal work.

[0023] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A special tool for removing pulley bearings from cranes, characterized in that, The device includes a clamping frame and a flip lever pin. The clamping frame is detachably fixed to the outer peripheral surface of the pulley hub of the pulley plate. The flip lever pin includes a pin body and a lever head. The lever head is integrally formed with one end of the pin body. The geometry of the lever head is capable of being inserted into the operating gap formed between the outer rings of the first and second bearings of the pulley plate. The pin body is rotatably connected to the clamping frame.

2. A special tool for removing pulley bearings for cranes according to claim 1, characterized in that, The clamping frame includes an upper housing, a lower housing, and a connecting plate. One end of the upper housing and the lower housing are detachably connected by connecting bolts, and the other end of the upper housing and the lower housing are detachably connected to the connecting plate by connecting bolts. The pin body is rotatably connected to the connecting plate. The side of the upper housing and the lower housing connected to the connecting plate, as well as the connecting plate, are all arc-shaped, and the arc of the arc is the same as the outer arc of the pulley hub.

3. A special tool for removing pulley bearings for cranes according to claim 1 or 2, characterized in that, The lever head of the flip lever pin is a non-circular flat structure. The thickness of the flat structure is smaller than the axial width of the operating gap, and the width of the flat structure is larger than its thickness.

4. A special tool for removing pulley bearings for cranes according to claim 3, characterized in that, There are two flip lever pins, namely a first flip lever pin and a second flip lever pin; the width of the lever head of the first flip lever pin is different from the width of the lever head of the second flip lever pin.

5. A special tool for removing pulley bearings for cranes according to claim 4, characterized in that, Both the first and second flip lever pins have movably fitted with tightening nuts. The connecting plate has two threaded through holes, and the outer wall of the tightening nut is threadedly connected to the threaded through holes.

6. A special tool for removing pulley bearings for cranes according to claim 2, characterized in that, The space formed by the upper housing, lower housing, and connecting plate is the axial displacement space for the first and second bearings to completely exit the bearing holes of the pulley plate; and the position of the connecting bolt corresponds to the position of the preset spoke holes on the pulley plate.

7. A special tool for removing pulley bearings for cranes according to claim 3, characterized in that, The flip lever pin is made of a high-hardness metal material that has undergone tempering and heat treatment, with a hardness range of HRC33 to HRC40; the edge of the lever head is rounded.

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