Cantilever crane radial braking device and integrated reactor top assembly cantilever crane

Abstract

The utility model relates to the technical field of nuclear power mechanical equipment, in particular to a radial braking device of a cantilever crane and an integrated reactor top assembly cantilever crane. The radial braking device comprises a braking mechanism and a brake, and the brake is installed at the first end of the main beam. The braking mechanism comprises a braking shaft and a braking sleeve, the first end of the braking shaft is connected with the brake through a clamping key, the second end of the braking shaft is rotationally connected with the second end of the main beam, a spiral groove is formed in the outer wall of the braking shaft, the braking sleeve is fixedly connected with the radial trolley, and balls are arranged on the inner wall of the braking sleeve. The balls are embedded into the spiral grooves; the brake can lock the brake shaft when the motor stops rotating and loosen the brake shaft when the motor rotates. According to the utility model, the problem that the radial trolley is difficult to stop quickly due to the influence of the inertia of a hoisted heavy object and the slope angle of the main beam is solved, and the radial trolley is prevented from sliding or rolling.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power mechanical equipment, in particular to a cantilever crane radial braking device and an integrated stack top assembly cantilever crane. Background Art

[0002] The integrated top assembly (IHP) cantilever crane in the AP / CAP series third-generation passive pressurized water reactor nuclear power unit provides hoisting services for the reactor top bolt tensioner during the reactor refueling period. Its principle belongs to lifting machinery. The cantilever crane used in the nuclear power unit includes a circumferential trolley, a radial trolley, an electric hoist and related auxiliary equipment. The circumferential trolley is driven by a motor and can move 360° in a circle along the circular track. The radial trolley can drive the electric hoist to move linearly along the radial direction of the circular track.

[0003] In the use of nuclear power plants, cantilever cranes have their particularities. For example, when receiving a stop command, the radial trolley must stop reliably and quickly without sliding or rolling. However, in many cases, due to the inertia of the hoisted heavy objects (large tonnage) and the slope angle formed by the deformation of the main beam, it is difficult for the radial trolley to stop quickly without sliding or rolling. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the embodiments of the utility model is to provide a radial braking device for a cantilever crane to solve the problem that the radial trolley is difficult to stop quickly due to the inertia of the lifted object and the slope angle of the main beam, thereby avoiding sliding or rolling of the radial trolley.

[0005] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0006] A radial braking device for a cantilever crane, the cantilever crane comprises a main beam, a radial trolley and a motor for driving the radial trolley are mounted on the main beam, the radial braking device comprises: a braking mechanism and a brake, the brake is mounted on the first end of the main beam; the braking mechanism comprises a brake shaft and a brake sleeve, the first end of the brake shaft is connected to the brake by a key, the second end of the brake shaft is rotatably connected to the second end of the main beam, a spiral groove is arranged on the outer wall of the brake shaft, the brake sleeve is fixedly connected to the radial trolley, and a ball is arranged on the inner wall of the brake sleeve, the ball is embedded in the spiral groove; the brake can lock the brake shaft when the motor stops, and release the brake shaft when the motor rotates.

[0007] Optionally, the brake is mounted on the second end of the main beam via a support, the support includes a connecting plate and a mounting plate, the connecting plate is mounted on the main beam, and the brake is mounted on the mounting plate.

[0008] Optionally, the main beam is an I-beam, and the main beam includes wing plates and a web plate, the web plate is located between the wing plates, the connecting plate of the support is detachably mounted on the web plate of the main beam, the mounting plate of the support is located at the end of the main beam, and the brake is arranged on the outer side of the mounting plate.

[0009] Optionally, a through hole is provided on the mounting plate of the support, and the first end of the brake shaft passes through the through hole of the mounting plate and is connected to the brake by a key; a fixed seat is provided on the lower side of the second end of the main beam, and the second end of the brake shaft is installed on the fixed seat through a bearing.

[0010] Optionally, the spiral groove of the brake shaft is formed by cutting the outer wall of the brake shaft along a spiral line with a circular cross-section, the lead of the spiral line is not less than 80 mm, and the helix angle is not greater than 30°.

[0011] Optionally, the brake sleeve is provided with at least two grooves, the two grooves are symmetrically arranged on both sides of the brake shaft in the radial direction, and the distance between the two grooves in the axial direction is equal to half of the lead of the helical line.

[0012] Optionally, two balls are arranged in each groove of the brake sleeve, and the two balls are arranged along the radial direction of the brake sleeve.

[0013] Optionally, the braking mechanism further includes a mounting seat, the radial trolley has a side plate, and the braking sleeve is mounted on the side plate of the radial trolley through the mounting seat.

[0014] Optionally, the mounting seat is detachably connected to the side plate of the radial trolley, the mounting seat has a through hole, the brake sleeve is inserted into the through hole of the mounting seat, and is detachably connected at the end.

[0015] An embodiment of the utility model also provides an integrated stack top assembly cantilever crane, comprising a main beam, a radial trolley, a lifting hoist, a hook and the radial braking device of the cantilever crane as described above, wherein the radial trolley is installed on the main beam, the lifting hoist is installed on the lower side of the radial trolley, the hook is installed on the lower side of the lifting hoist, and the braking device is installed on the main beam for braking the radial trolley.

[0016] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0017] When the radial trolley driving motor stops and the hook hoisting object is positioned radially in the main beam, the brake is engaged, the brake shaft is radially locked and stops rotating, and the brake shaft locks the radial trolley through the action of the ball and the brake sleeve to prevent the radial trolley from moving in the radial direction of the main beam under the action of inertia. The utility model solves the problem that the radial trolley is difficult to stop quickly due to the inertia of the hoisted heavy object, the slope angle of the main beam, etc., and avoids the radial trolley from sliding or rolling.

[0018] Additional advantages of the present invention will be given in the following description, and some will become apparent from the following description or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0020] Figure 1 It is a front view of the braking device provided by the embodiment of the utility model installed on the main beam;

[0021] Figure 2 It is a side view of the braking device provided by the embodiment of the utility model installed on the main beam;

[0022] Figure 3 It is an enlarged schematic diagram of the braking device provided by the embodiment of the utility model installed on the main beam;

[0023] Figure 4 It is a schematic diagram of a brake mechanism provided by an embodiment of the utility model;

[0024] In the figure: 1, main beam; 2, radial trolley; 3, support; 31, connecting plate; 32, mounting plate; 4, brake; 5, brake mechanism; 51, brake shaft; 52, brake sleeve; 53, mounting seat; 54, ball bearing; 6, fixed seat; 7, lifting hoist; 8, hook;

[0025] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0026] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0027] As introduced in the background technology, during the use of nuclear power plants, the integrated stack top assembly cantilever crane has its particularity. Due to the large tonnage of the lifting weight, the inertia of the radial trolley is large, and the main beam may deform to form a slope angle. These factors make it difficult for the radial trolley to stop quickly, and the radial trolley (wheel) may slide or roll after receiving the stop command. In order to solve the above technical problems, the utility model proposes a cantilever crane radial brake device, which quickly locks the brake when the radial trolley is stopped, and can be parked accurately without sliding or rolling.

[0028] like Figure 1-Figure 4 As shown, in one embodiment of the utility model, a radial brake device for a cantilever crane is proposed. The cantilever crane comprises a main beam 1, on which a radial trolley 2 and a motor for driving the radial trolley 2 are mounted. The radial brake device comprises a brake mechanism 5 and a brake 4, and the brake 4 is mounted at the first end of the main beam 1. It should be noted that the first end in this article refers to Figure 1 The second end refers to the right end of Figure 1 The left end is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. The brake 4 is an existing device that can be obtained by purchasing, such as an electromagnetic clutch.

[0029] The brake mechanism 5 includes a brake shaft 51 and a brake sleeve 52. The first end of the brake shaft 51 is connected to the brake 4 by a key, and the second end of the brake shaft 51 is rotatably connected to the second end of the main beam 1, that is, when the brake 4 is powered off, the brake shaft 51 can rotate freely. A spiral groove is arranged on the outer wall of the brake shaft 51, the brake sleeve 52 is fixedly connected to the radial trolley 2, and a ball 54 is arranged on the inner wall of the brake sleeve 52, and the ball 54 is embedded in the spiral groove; the brake 4 can lock the brake shaft 51 when the motor stops, and release the brake shaft 51 when the motor rotates.

[0030] That is, during the movement of the radial trolley 2, the brake mechanism 5 follows the movement of the radial trolley 2 through the brake shaft 51 to ensure normal radial movement. When the radial trolley 2 stops transporting, the brake sleeve 52 binds its steel ball in the brake shaft 51. When the radial trolley 2 driving motor stops and the hook 8 radially positions the hoisted object on the main beam 1, the electromagnetic clutch engages to radially lock the brake shaft 51 and stop it from rotating. The brake shaft 51 locks the radial trolley 2 through the action of the steel ball and the brake sleeve 52 to prevent the radial trolley 2 from moving in the radial direction of the main beam 1 under the action of inertia. The utility model solves the problem that the radial trolley 2 is difficult to stop quickly due to the inertia of the hoisted heavy object and the slope angle of the main beam 1, and avoids the radial trolley 2 from sliding or rolling.

[0031] like Figure 1 As shown, the brake 4 is mounted on the second end of the main beam 1 through a support 3, and the support 3 includes a connecting plate 31 and a mounting plate 32. Figure 3 As shown, the connecting plate 31 is mounted on the main beam 1, and the brake 4 is mounted on the mounting plate 32. Specifically, the main beam 1 is an I-beam, and the main beam 1 includes a wing plate and a web plate, and the web plate is located between the wing plates. The connecting plate 31 of the support 3 is detachably mounted on the web plate of the main beam 1, and the mounting plate 32 of the support 3 is located at the end of the main beam 1. The brake 4 is arranged on the outer side of the mounting plate 32 and is fixed to the mounting plate 32 by bolts. Of course, it can be understood that the support 3 can also be welded to the lower bottom surface of the cross beam wing plate to cooperate with the clutch to complete the movement under normal conditions.

[0032] Further, such as Figure 3 As shown, a through hole is provided on the mounting plate 32 of the support 3, and the first end of the brake shaft 51 passes through the through hole of the mounting plate 32 and is connected to the brake 4 by a key; a fixing seat 6 is provided on the lower side of the second end of the main beam 1, as shown in FIG. Figure 1 As shown, the second end of the brake shaft 51 is mounted on the fixing seat 6 via a bearing.

[0033] like Figure 1 , Figure 4 As shown, the spiral groove of the brake shaft 51 is formed by cutting the outer wall of the brake shaft 51 along a spiral line with a circular cross-section. The lead of the spiral line is not less than 80 mm, and the helix angle is not greater than 30°.

[0034] It should be noted that the brake shaft 51 in this embodiment is different from the conventional ball screw 54. In the ball screw nut pair, the rotation of the ball screw 54 drives the ball nut 54 to rotate, and the rotational motion is converted into linear motion. Therefore, the pitch of the spiral ball 54 groove in the conventional ball screw 54 is small, and the self-locking performance is good. In this embodiment, when the radial trolley 2 moves, the brake shaft 51 needs to be driven to rotate by the brake sleeve 52, that is, the linear motion is converted into rotation. Therefore, the brake shaft 51 in this embodiment needs to have a larger lead.

[0035] Furthermore, the brake sleeve 52 is provided with at least two grooves. Figure 4 As shown, two grooves are symmetrically arranged on both sides of the brake shaft 51 in the radial direction, and the distance between the two grooves in the axial direction is equal to half of the lead of the spiral line, and the brake sleeve 52 and the brake shaft 51 are meshed through the ball 54. Of course, it can be understood that multiple grooves can also be provided, and the arrangement of the multiple grooves needs to correspond to the spiral groove on the brake shaft 51; or, a spiral ball 54 groove with the same lead as the spiral groove of the brake shaft 51 is also provided on the inner wall of the brake sleeve 52.

[0036] like Figure 4 As shown, two balls 54 are arranged in each groove of the brake sleeve 52, that is, there are four balls in the brake sleeve. The two balls 54 on one side are arranged along the radial direction of the brake sleeve 52. Specifically, the groove is a through hole punched on the cylinder wall of the brake sleeve 52. Since the cylinder wall is thick, the steel balls on the radial outer side play a place-taking role, so that the steel balls on the radial inner side protrude from the inner hole of the brake sleeve 52 and cooperate with the brake shaft 51.

[0037] The brake sleeve 52 binds the steel balls (i.e., ball bearings 54) on both sides thereof in the large-lead brake shaft 51. When the driving motor of the radial trolley 2 stops and the hook 8 radially positions the hoisted object on the main beam 1, the electromagnetic clutch engages to radially lock the brake shaft 51 and stop it from rotating. The brake shaft 51 locks the radial trolley 2 through the steel balls in its groove and the brake sleeve 52 to prevent the radial trolley 2 from moving in the radial direction of the main beam 1 under the action of inertia.

[0038] like Figure 3 , Figure 4 As shown, the brake mechanism 5 further includes a mounting seat 53, the radial trolley 2 has a side plate, and the brake sleeve 52 is mounted on the side plate of the radial trolley 2 through the mounting seat 53. Specifically, the mounting seat 53 is detachably connected to the side plate of the radial trolley 2 and is fixed to the side plate of the radial trolley 2 by bolts. The mounting seat 53 has a through hole, and the brake sleeve 52 is inserted into the through hole of the mounting seat 53 and is detachably connected at the end. Alternatively, the mounting seat 53 is welded to the side plate of the radial trolley 2 to fix the brake mechanism 5.

[0039] Working principle of the brake device:

[0040] During the movement, the brake mechanism 5 follows the radial trolley 2 on the brake shaft 51 to ensure normal radial movement. When the transportation stops, the brake sleeve 52 binds the steel balls on both sides thereof in the large-lead moving shaft, and the mounting seat 53 is fixed to the side plate of the radial trolley 2 by bolts. When the driving motor of the radial trolley 2 stops and the hook 8 radially positions the hoisted object on the main beam 1, the electromagnetic clutch in the brake mechanism 5 engages to radially lock the brake shaft 51 and stop the rotation. The brake shaft 51 locks the radial trolley 2 through the steel balls in its groove, the brake sleeve 52, and the mounting seat 53 to prevent the radial trolley 2 from moving in the radial direction of the main beam 1 under the action of inertia. Compared with the prior art, the utility model can solve the problems of the radial trolley 2 due to the large inertia of the lifting heavy objects and the influence of the slope angle caused by the deformation of the main beam 1. When in the stopped state, the brake 4 is quickly locked, and the radial trolley 2 can be parked accurately without sliding or rolling.

[0041] Based on the above cantilever crane radial braking device, the utility model embodiment also provides an integrated stack top assembly cantilever crane, such as Figure 1 , Figure 2 As shown, it includes a main beam 1, a radial trolley 2, a lifting hoist 7, a hook 8 and a braking device. The radial trolley 2 is installed on the main beam 1. The radial trolley 2 is installed on both sides of the web of the main beam 1 through its own rollers, and can roll freely on the lower wing plate to achieve radial movement on the main beam 1. The lifting hoist 7 is installed on the lower side of the radial trolley 2, the hook 8 is installed on the lower side of the lifting hoist 7, and the braking device is installed on the main beam 1 for braking the radial trolley 2. Since the above-mentioned braking device has the above-mentioned technical effects, please refer to the above-mentioned embodiment for the technical effects of the cantilever crane using the braking device.

[0042] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A radial braking device for a cantilever crane, the cantilever crane comprising a main beam, a radial trolley and a motor for driving the radial trolley are mounted on the main beam, characterized in that: The radial braking device comprises: a braking mechanism and a brake, wherein the brake is mounted on the first end of the main beam; The brake mechanism comprises a brake shaft and a brake sleeve, wherein the first end of the brake shaft is connected to the brake via a key, the second end of the brake shaft is rotatably connected to the second end of the main beam, a spiral groove is arranged on the outer wall of the brake shaft, the brake sleeve is fixedly connected to the radial trolley, and a ball is arranged on the inner wall of the brake sleeve, and the ball is embedded in the spiral groove; The brake can lock the brake shaft when the motor stops rotating, and release the brake shaft when the motor rotates.

2. The cantilever crane radial braking device according to claim 1, characterized in that: The brake is installed on the second end of the main beam through a support, the support includes a connecting plate and a mounting plate, the connecting plate is installed on the main beam, and the brake is installed on the mounting plate.

3. The cantilever crane radial braking device according to claim 2, characterized in that: The main beam is an I-beam, and the main beam includes a wing plate and a web plate, the web plate is located between the wing plates, the connecting plate of the support is detachably mounted on the web plate of the main beam, the mounting plate of the support is located at the end of the main beam, and the brake is arranged on the outer side of the mounting plate.

4. The cantilever crane radial braking device according to claim 2, characterized in that: A through hole is provided on the mounting plate of the support, and the first end of the brake shaft passes through the through hole of the mounting plate and is connected to the brake by a key; a fixed seat is provided on the lower side of the second end of the main beam, and the second end of the brake shaft is installed on the fixed seat through a bearing.

5. The cantilever crane radial braking device according to claim 1, characterized in that: The spiral groove of the brake shaft is formed by cutting the outer wall of the brake shaft along a spiral line with a circular cross-section. The lead of the spiral line is not less than 80 mm, and the helix angle is not greater than 30°.

6. The cantilever crane radial braking device according to claim 5, characterized in that: The brake sleeve is provided with at least two grooves, the two grooves are symmetrically arranged on both sides of the brake shaft in the radial direction, and the distance between the two grooves in the axial direction is equal to half of the lead of the spiral line.

7. The radial braking device of a cantilever crane according to claim 5, characterized in that: Two balls are arranged in each groove of the brake sleeve, and the two balls are arranged along the radial direction of the brake sleeve.

8. The cantilever crane radial braking device according to claim 1, characterized in that: The brake mechanism further comprises a mounting seat, the radial trolley has a side plate, and the brake sleeve is mounted on the side plate of the radial trolley through the mounting seat.

9. The cantilever crane radial braking device according to claim 8, characterized in that: The mounting seat is detachably connected to the side plate of the radial trolley, the mounting seat has a through hole, the brake sleeve is inserted into the through hole of the mounting seat, and is detachably connected at the end.

10. An integrated stack top assembly cantilever crane, characterized in that: It includes a main beam, a radial trolley, a lifting hoist, a hook and a radial braking device of a cantilever crane as described in any one of claims 1 to 9, wherein the radial trolley is installed on the main beam, the lifting hoist is installed on the lower side of the radial trolley, the hook is installed on the lower side of the lifting hoist, and the braking device is installed on the main beam for braking the radial trolley.

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