Flexible anti-abrasion stopping device for steel wire rope for bridge crane trolley

Abstract

The invention discloses a flexible anti-abrasion stopping device for a steel wire rope for a bridge crane trolley, belongs to the technical field of cranes, and aims to solve the problems that the steel wire rope is rigidly rubbed and abraded with a wire passing groove of a frame due to swinging and deflection, and a traditional rigid stopping device only transfers abrasion. The device comprises two stopping pieces which are symmetrically arranged on the two sides of a groove opening of a wire passing groove of a trolley frame. The backstop piece comprises bases fixed side by side, swing arms are hinged to the tops of the bases, the bottom ends of the two swing arms are connected with a rotatable backstop roller covered with a wear-resistant layer, tension springs are arranged between the swing arms and the bases, and compression springs and buffer cushion blocks are arranged on the sides, close to the wall of the wire passing groove, of the swing arms. During working, the steel wire rope is in rolling contact with the stop roller, the swing arm swings during deflection, the tension spring resets, and the pressure spring buffers. The service life of the steel wire rope is prolonged; the frame strength is guaranteed; the operation stability is improved; and the maintenance is convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of crane technology, in particular to a flexible anti-wear stop device for a trolley of a bridge crane. BACKGROUND

[0002] The hoisting mechanism of a bridge crane lifts and lowers a lifting tool through a steel wire rope. The steel wire rope vertically passes through a reserved hole on the trolley frame. During long-term operation of the crane, due to the swing during lifting and lowering, and the deflection of the steel wire rope caused by the running inertia of the trolley and the car, the steel wire rope will come into contact and friction with the steel structure at the edge of the hole in the frame. This continuous rigid contact and friction will cause two major problems:

[0003] 1. Abnormal wear of the steel wire rope: severely shortens the service life of the steel wire rope, brings safety hazards, needs frequent replacement, and increases maintenance costs.

[0004] 2. Wear of the frame structure: long-term friction also causes wear to the frame steel, affecting the structural strength.

[0005] At present, a common solution is to install a steel wire rope anti-wear stop device at the wear location, but this device is a rigid stop. The contact between the steel wire rope and the rigid body still exists, and the wear is only transferred or delayed, without effectively solving the root problem.

[0006] Therefore, there is an urgent need for a device that can actively adapt to the movement of the steel wire rope, buffer the contact force, and fundamentally reduce wear. SUMMARY

[0007] The present application aims to provide a flexible anti-wear stop device for a trolley of a bridge crane to solve the problems raised in the background.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical solution: a flexible anti-wear stop device for a trolley of a bridge crane, comprising two stop pieces installed on the trolley frame, the two stop pieces being symmetrically distributed on both sides of the slot opening of the wire passing slot on the trolley frame, the stop piece comprising two bases, the two bases being fixed side by side in the slot opening of the wire passing slot, a swing arm being hinged to the top of the base, the two swing arms penetrating the wire passing slot and being commonly connected at the bottom end by a stop roller, a tension spring being provided between the swing arm and the base, and a compression spring being installed on the side of the swing arm close to the wall surface of the wire passing slot.

[0009] Preferably, upper protruding rods are provided on both sides of the base, lower protruding rods are correspondingly provided on both sides of the swing arm, and the two ends of the tension spring are connected to the upper protruding rods and the lower protruding rods, respectively.

[0010] Preferably, a pin shaft sleeve is provided at the top of the swing arm, the pin shaft sleeve and the top of the base are connected by a pin shaft, and a grease nipple is provided on the pin shaft sleeve.

[0011] Preferably, a bearing sleeve is provided at the bottom of the swing arm, and a bearing is installed inside the bearing sleeve. The two ends of the stop roller are inserted into the bearing with interference fit and are limited by snap rings.

[0012] Preferably, the two swing arms are provided with a boss on one side close to each other, and a buffer pad is installed on the side of the boss near the inner wall of the wire groove, and a compression spring is provided between the buffer pad and the boss.

[0013] Preferably, the surface of the stop roller is covered with a wear-resistant layer, the wear-resistant layer being made of rubber or engineering plastic, and the stop roller and the wire rope of the winch above the trolley frame are in rolling contact.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] This invention relates to a flexible anti-wear stop device for steel wire ropes used in bridge crane trolleys.

[0016] 1. This device fundamentally solves the wear problem between the wire rope and the frame. Traditional rigid stop devices can only transfer or delay wear, while in this device, the stop roller and the wire rope adopt a rolling contact method, transforming traditional sliding friction into rolling friction, significantly reducing the friction coefficient when they come into contact. At the same time, the rubber or engineering plastic wear-resistant layer covering the surface of the stop roller further reduces direct wear on the surface of the wire rope, extending its service life. In addition, the compression spring and buffer pad between the swing arm and the inner wall of the cable tray prevent rigid collision between the swing arm and the frame, effectively reducing the wear of the steel profile at the edge of the cable tray. The amount of wear is lower than that of traditional devices, ensuring the structural strength of the frame and reducing frame maintenance costs.

[0017] 2. This device possesses excellent flexibility and adaptability, actively adapting to the dynamic movement of the wire rope. When the crane's trolley or crane travels with inertia, or when the lifting device swings, causing the wire rope to deviate, the swing arm can flexibly swing around the pin at the top of the base. The tension spring provides real-time restoring force to the swing arm, ensuring that the stop roller remains in contact with the wire rope. Meanwhile, the compression spring absorbs the impact force caused by the wire rope deviating through deformation, avoiding localized stress concentration in the wire rope caused by the rigid restraint of the rigid stop device. This not only reduces fatigue damage to the wire rope but also lowers the vibration and noise generated when the wire rope deviates, improving the stability and smoothness of crane operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 for Figure 1 Side view;

[0020] Figure 3 for Figure 1 Schematic diagram of the stop stop component;

[0021] Figure 4 For Figure 3 Base structure schematic diagram;

[0022] Figure 5 For Figure 3 Swing arm structure schematic diagram.

[0023] Figure: 10, stop; 100, base; 101, upper convex rod; 110, swing arm; 111, pin shaft sleeve; 112, bearing sleeve; 113, lower convex rod; 114, boss; 120, stop roller; 130, tension spring; 140, compression spring; 150, buffer pad; 20, trolley frame; 30, winch; 40, steel wire rope; 50, wire slot. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. Figures 1-5 The specific implementation process of the present application is described in detail to ensure accurate assembly of the device, reliable operation, and flexible anti-wear effect.

[0026] Before assembling the device, the parts need to be prepared: two identical stop pieces 10, each stop piece 10 including two bases 100, two swing arms 110, one stop roller 120, two sets of tension springs 130, two sets of compression springs 140, and two buffer pads 150, as well as auxiliary parts such as pins, bearings, circlips, bolts, and lubricating grease. During assembly, first, assemble a single stop piece 10, and then fix the whole on the trolley frame 20. Figure 4 As shown, the base 100 is provided with an upper convex rod 101 on both sides, and the two bases 100 are fixed side by side on the edge of the wire slot 50, ensuring that the base 100 is tightly fitted with the contact surface of the trolley frame 20 to avoid loosening; then, the connection between the swing arm 110 and the base 100 is handled, as shown in Figure 5 As shown, the swing arm 110 is provided with a pin shaft sleeve 111 at the top, and lubricating grease is first injected into the pin shaft sleeve 111, which can be supplemented through the lubricating grease nozzle on the sleeve later, and then the pin shaft is inserted through the pin shaft sleeve 111 and the hinge hole at the top of the base 100 to realize the hinge connection of the swing arm 110 and the base 100, ensuring that the swing arm 110 can swing flexibly around the pin shaft without jamming.

[0027] The bottom of the swing arm 110 is provided with a bearing sleeve 112. After a suitable deep groove ball bearing is installed in the bearing sleeve 112, the stop roller 120 is inserted into the bearing inner ring with interference at both ends, and then the snap spring is installed outside both ends of the stop roller 120 to limit the axial position and prevent the stop roller 120 from moving. Then, the elastic component is assembled. The swing arm 110 is provided with a lower protruding rod 113 on both sides corresponding to the position of the upper protruding rod 101 on the base 100. The two ends of the tension spring 130 are respectively hooked on the upper protruding rod 101 and the lower protruding rod 113. The pre-tightening force of the compression spring 140 is adjusted to ensure that the swing arm 110 remains vertically downward without external force. At the same time, the swing arm 110 is provided with a boss 114 on the side close to each other. The mounting hole is arranged on the boss 114. The double-headed bolt is inserted into the mounting hole. The compression spring 140 and the buffer pad 150 are sleeved on the double-headed bolt. The nuts are screwed into both ends of the double-headed bolt to limit the position. The end of the compression spring 140 is provided with the buffer pad 150. The buffer pad 150 faces the inner wall of the wire groove 50. Thus, the single stop piece 10 is assembled.

[0028] Reference Figure 1 The two assembled stop pieces 10 are symmetrically installed on both sides of the wire groove 50. The distance between the two stop pieces 10 is adjusted so that the axis of the stop roller 120 is parallel to the center line of the wire groove 50, and the surface of the stop roller 120 is slightly in contact with the steel wire rope 40 lowered by the winch 30 in the natural state. The contact pressure can be adjusted by the pre-tightening force of the compression spring 140. The body of the stop roller 120 is made of 45 steel and the surface is chrome plated for rust prevention. The outer surface is covered with a wear-resistant layer 5-8 mm thick through the vulcanization process. If rubber material is selected, nitrile rubber (oil and wear resistant, suitable for crane oil pollution environment) is preferred. If engineering plastic is selected, nylon 66 (low friction coefficient, light weight, reduces the movement load of the swing arm 110) is preferred. The tension spring 130 is made of stainless steel with a wire diameter of 3-5 mm, a free length of 80-100 mm, and an elastic coefficient of 5-8 N / mm. It is used to provide a restoring force for the swing arm 110. The compression spring 140 is made of carbon spring steel with a wire diameter of 2-3 mm, a free length of 20-30 mm, and an elastic coefficient of 8-12 N / mm. It is used to buffer the swing amplitude of the swing arm 110 to avoid rigid collision between the swing arm 110 and the vehicle frame.

[0029] When the device is working, the swing arm 110 is driven by the winch 30 to rotate around the shaft 110, and the swing arm 110 is in the working position. Figure 1 , Figure 2As shown, when the winch 30 drives the wire rope 40 to rise or fall vertically, the wire rope 40 contacts the surface of the stop roller 120, and the stop roller 120 rotates freely around the bearing, converting traditional sliding friction into rolling friction, which greatly reduces wear. When the inertia of the crane trolley or the swing of the lifting device causes the wire rope 40 to deviate to one side of the wire groove 50, the wire rope 40 squeezes the stop roller 120 on the corresponding side, pushing the swing arm 110 to swing around the pin sleeve 111 towards the inner wall of the wire groove 50, thus slowing down the swing speed of the swing arm 110. When the swing arm 110 approaches the inner wall of the wire groove 50, the buffer pad 150 first contacts the inner wall and squeezes the compression spring 140, and the compression spring 140 deforms to absorb the impact force. After the deflection force of the wire rope 40 disappears, the elastic force of the tension spring 130 drives the swing arm 110 to return to its original position, and the stop roller 120 re-fits the wire rope 40, restoring normal rolling contact.

[0030] To ensure long-term stable operation of the device, regular maintenance is required: every 3 months, inject lithium-based grease into the pin sleeve 111 through the grease nipple at the top of the swing arm 110 to ensure sufficient lubrication of the hinged parts; every 6 months, check the tension spring 130 and compression spring 140. If cracks or plastic deformation occur (such as the free length change of tension spring 130 exceeding 10%), replace the spring with the same model in time; every 12 months, check the wear-resistant layer of the stop roller 120. If the thickness is less than 2mm or cracks or peeling occur, replace the stop roller 120. At the same time, check the buffer pad 150. If the surface depression depth exceeds 5mm, replace the pad with a new one.

[0031] This implementation process strictly follows the device structure design. Through reasonable assembly and maintenance, it fully leverages the flexible anti-wear advantages of "rolling contact + elastic buffering," effectively extending the service life of the wire rope by 40% and reducing wear on the frame through the cable tray by 50%, making it suitable for the long-term operation needs of bridge crane trolleys.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flexible anti-wear stop device for steel wire rope of a bridge crane trolley, comprising two stop pieces (10) installed on the trolley frame (20), characterized in that: Two stoppers (10) are symmetrically distributed on both sides of the slot opening of the wire passage (50) on the trolley frame (20). The stoppers (10) include two bases (100), which are fixed side by side at the slot opening of the wire passage (50). A swing arm (110) is hinged to the top of the base (100). The two swing arms (110) pass through the wire passage (50) and are connected to a stop roller (120) at the bottom. A tension spring (130) is provided between the swing arm (110) and the base (100). A compression spring (140) is installed on the side of the swing arm (110) near the wall of the wire passage (50).

2. The flexible anti-wear stop device for steel wire rope of bridge crane trolley according to claim 1, characterized in that: The base (100) has upper protruding rods (101) on both sides, and the swing arm (110) has lower protruding rods (113) on both sides. The two ends of the tension spring (130) are connected to the upper protruding rods (101) and the lower protruding rods (113) respectively.

3. The flexible anti-wear stop device for steel wire rope of bridge crane trolley according to claim 2, characterized in that: A pin sleeve (111) is provided on the top of the swing arm (110), and the top of the pin sleeve (111) and the base (100) are connected by a pin. A grease nipple is provided on the pin sleeve (111).

4. The flexible anti-wear stop device for steel wire rope of bridge crane trolley according to claim 3, characterized in that: A bearing sleeve (112) is provided at the bottom of the swing arm (110), and a bearing is installed inside the bearing sleeve (112). The two ends of the stop roller (120) are inserted into the bearing with interference fit and are limited by snap rings.

5. The flexible anti-wear stop device for steel wire rope of bridge crane trolley as described in claim 4, characterized in that: Two swing arms (110) are provided with a boss (114) on one side close to each other. A buffer pad (150) is installed on the side of the boss (114) close to the inner wall of the wire groove (50), and a compression spring (140) is placed between the buffer pad (150) and the boss (114).

6. The flexible anti-wear stop device for steel wire rope of bridge crane trolley according to claim 1, characterized in that: The surface of the stop roller (120) is covered with a wear-resistant layer made of rubber or engineering plastic. The stop roller (120) and the wire rope (40) of the winch (30) above the trolley frame (20) are in rolling contact.

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