A driving system for the slewing mechanism of a door machine

Abstract

The present invention relates to the field of door machine slewing equipment, and specifically to a driving system for a door machine slewing mechanism, including a motor; the motor is connected to a speed reducer through a torque-limiting permanent magnet coupling. The present invention discloses a driving system for a door machine slewing mechanism. The present invention uses a torque-limiting permanent magnet coupling to replace the ultimate torque limiter, making the protection action of the entire driving system more sensitive, and at the same time being able to automatically recover, reducing or avoiding damage to parts. At the same time, by adopting a new type of torque-limiting permanent magnet coupling, the driving system can have a soft start function, better ensuring the stability of the entire system.

Description

Technical Field

[0001] The present invention relates to the field of portal crane slewing equipment, and specifically to a driving system for a portal crane slewing mechanism. Background Art

[0002] A portal crane, commonly known as a "gantry crane", refers to a crane traditionally used at the front of a port terminal. On a gantry base running along a ground track, a slewing boom is provided, which has four cooperating mechanisms: hoisting, slewing, luffing, and traveling. Rail trains or other vehicles can pass under the gantry, and ship-to-ship and direct loading / unloading operations can be carried out. The slewing mechanism is a mechanism that enables the slewing part of the crane to rotate horizontally around the slewing center line. The slewing mechanism usually consists of a slewing bearing device and a slewing drive device. The slewing drive device is used to drive the slewing part to rotate relative to the non-slewing part.

[0003] In the prior art, a portal crane slewing mechanism generally consists of an electric motor, a speed reducer, a slewing pinion, and a large gear ring on the slewing bearing device. A limit torque limiter and a brake wheel are installed between the electric motor and the speed reducer to prevent overload and parking braking. The limit torque limiter relies on friction plates for transmission. When overloaded, the friction plates slip to provide protection. The friction plates are prone to wear and need to be replaced in a timely manner, otherwise the reliability of the transmission will be affected.

[0004] These problems result in high maintenance costs and long downtime for the driving system of the portal crane slewing mechanism. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a new driving system for a portal crane slewing mechanism.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A driving system for a portal crane slewing mechanism, comprising an electric motor; the electric motor is connected to a speed reducer through a torque-limiting permanent magnet coupling.

[0008] The torque-limiting permanent magnet coupling is connected to the motor shaft through a connecting member; the torque-limiting permanent magnet coupling includes a permanent magnet rotor component, and the permanent magnet rotor component includes a shaft sleeve. The torque-limiting permanent magnet coupling is connected to the speed reducer shaft through the shaft sleeve; a brake wheel is provided on the shaft sleeve.

[0009] The torque-limiting permanent magnet coupling includes a conductor rotor component and a permanent magnet rotor component. The permanent magnet rotor component includes an output shaft; a permanent magnet disk is sleeved on the output shaft; the conductor rotor component includes an input end conductor disk component and an output end conductor disk component; the input end conductor disk component and the output end conductor disk component are distributed on both sides of the permanent magnet disk; the permanent magnet disk includes a first disk and a second disk; an adjusting mechanism is provided between the first disk and the second disk.

[0010] The adjusting mechanism includes connection holes provided on the first disk and the second disk. The second disk is connected with a limit screw through the connection hole. The limit screw is coaxially arranged with the connection hole on the first disk. A limit mechanism for cooperating with the limit screw is provided on the first disk. The limit mechanism includes a limit slider for restricting the lateral movement of the limit screw.

[0011] One side of the limit slider is connected with a compression spring.

[0012] The limit mechanism further includes a limit seat. The limit seat is connected with the first disk. The limit slider is connected with the limit seat through the compression spring.

[0013] The limit seat includes a seat body. A placement groove is provided on one side of the seat body close to the first disk. The seat body is horizontally provided with a through-hole. The through-hole is coaxially arranged with the connection hole and is communicated with the placement groove.

[0014] A locking nut is provided on the limit screw.

[0015] A buffer limit cushion block is provided on the output shaft. The buffer limit cushion block is arranged at the central position of the first disk and the second disk in the static state.

[0016] The buffer limit cushion block is made of rubber and plastic materials.

[0017] The advantages of the present invention are as follows:

[0018] The present invention discloses a driving system for a door machine slewing mechanism. The present invention adopts a torque-limiting permanent magnet coupling to replace the ultimate torque limiter, making the protection action of the entire driving system more sensitive, and at the same time being able to automatically recover, reducing or avoiding the damage of parts. At the same time, by adopting a new type of torque-limiting permanent magnet coupling, the driving system can have a soft start function, better ensuring the stability of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following briefly describes the content expressed in each drawing of the specification of the present invention and the marks in the drawings:

[0020] Figure 1 is a structural sectional view of the present invention;

[0021] Figure 2 is a structural sectional view of the present invention after the overload protection action;

[0022] Figure 3 is a structural sectional view of the torque-limiting permanent magnet coupling in the present invention;

[0023] Figure 4 is Figure 3Structural sectional view of the torque-limiting permanent magnet coupling after the torque-limiting protection action;

[0024] Figure 5 For Figure 3 Partial enlarged sectional view of the limiting mechanism in the torque-limiting permanent magnet coupling;

[0025] Figure 6 For Figure 3 Partial enlarged sectional view of the limiting mechanism in the torque-limiting permanent magnet coupling when starting;

[0026] Figure 7 For Figure 3 Partial enlarged sectional view of the limiting mechanism in the torque-limiting permanent magnet coupling during normal operation;

[0027] Figure 8 For Figure 3 Partial enlarged sectional view of the limiting mechanism in the torque-limiting permanent magnet coupling after the protection action;

[0028] Figure 9 For Figure 3 Partial enlarged sectional view of the limiting mechanism in the torque-limiting permanent magnet coupling after increasing the starting limit distance;

[0029] Figure 10 For Figure 3 Partial enlarged sectional view of the limiting mechanism in the torque-limiting permanent magnet coupling when starting after increasing the starting limit distance;

[0030] The markings in the above figures are all:

[0031] 1. Conductor rotor component, 2. Permanent magnet rotor component, 101. First bushing, 102. Input end conductor disc component, 103. Air gap plate, 104. Output end conductor disc component, 201. Second bushing, 202. Output shaft, 203. Permanent magnet disc, 204. Shaft end baffle, 205. Buffer limit cushion block, 206. Locking nut, 207. Limit screw, 208. Limit seat, 209. Compression spring, 210. Limit slider, 3. Motor, 4. Reducer, 5. Brake wheel. Detailed implementation manners

[0032] The following further elaborates in detail on the specific implementation manners of the present invention through the description of the optimal embodiments with reference to the accompanying drawings.

[0033] A driving system for the slewing mechanism of a portal crane includes a motor 3; the motor 3 is connected to a reducer 4 through a torque-limiting permanent magnet coupling 1-2; the present invention discloses a driving system for the slewing mechanism of a portal crane. The present invention uses a torque-limiting permanent magnet coupling to replace the ultimate torque limiter, making the protection action of the entire driving system more sensitive and capable of automatic recovery, reducing or avoiding damage to parts.

[0034] Preferably, in the present invention, the torque-limiting permanent magnet coupling 1-2 is connected to the motor shaft through a connecting member; the connecting member can also be a bushing structure, which can be referred to as the first bushing 101; the torque-limiting permanent magnet coupling 1-2 includes a permanent magnet rotor component 2, and the permanent magnet rotor component 2 includes a bushing. The torque-limiting permanent magnet coupling 1-2 is connected to the shaft of the speed reducer 4 through the bushing; a brake wheel 5 is provided on the bushing; the above bushing is the second bushing 201 described below, which is just for the convenience of description; the above connecting member can be a bushing structure or other structures. In the present invention, the brake wheel 5 is provided to facilitate the braking of the subsequent entire device; at the same time, the present invention uses a torque-limiting permanent magnet coupling with a brake wheel 5 to replace the original ultimate torque limiter and brake wheel 5. During startup, it has a soft startup function. When the load is overloaded, the torque-limiting permanent magnet coupling automatically protects and cuts off the power transmission to protect the safety of the system. When the fault is eliminated or the machine stops, the torque-limiting permanent magnet coupling automatically resets. The protection action is sensitive, there are no vulnerable parts, the maintenance cost is saved, and the downtime for maintenance is reduced.

[0035] Preferably, the torque-limiting permanent magnetic coupling 1-2 in the present invention comprises a conductor rotor component 1 and a permanent magnetic rotor component 2, wherein the permanent magnetic rotor component 2 comprises an output shaft 202; a permanent magnetic disk 203 is sleeved on the output shaft 202; the conductor rotor component 1 comprises an input-end conductor disk component 102 and an output-end conductor disk component 104; the input-end conductor disk component 102 and the output-end conductor disk component 104 are distributed on both sides of the permanent magnetic disk 203; the permanent magnetic disk 203 comprises a first magnetic disk 2031 and a second magnetic disk 2032; an adjusting mechanism is provided between the first magnetic disk 2031 and the second magnetic disk 2032; the purpose of setting the adjusting mechanism is to adjust the air gap between the permanent magnetic disk 203 and the conductor disk, and the purpose is There are various devices for realizing soft starting of the coupling and adjusting the air gap between the permanent magnetic disk 203 and the conductor disk. Bolts, springs or existing adjustment mechanisms can be used, as long as the soft starting of the coupling can be realized. Of course, in order to better realize the stable starting of the coupling, the adjustment mechanism in the present invention includes a connecting hole 203-1 arranged on the first magnetic disk 2031 and the second magnetic disk 2032, and the second magnetic disk 2032 is connected to the limiting screw 207 through the connecting hole 203-1; the limiting screw 207 is coaxially arranged with the connecting hole 203-1 on the first magnetic disk 2031; the first magnetic disk 2031 is provided with a limiting mechanism used in conjunction with the limiting screw 207, and the limiting mechanism The structure includes a limit slider 210 for limiting the lateral movement of the limit screw 207; the present invention can better control the air gap by limiting the relative position between the first magnetic disk 2031, the second magnetic disk 2032 and the two conductor disks through the setting of the limit screw 207, the connecting hole 203-1 and the limit slider 210; in addition, in the present invention, the setting method of the above-mentioned adjustment mechanism can be reversed, which is also achievable, because the basic improvement point of the present invention is to control the air gap between the permanent magnetic disk 203 and the conductor disk by limiting the relative position of the first magnetic disk 2031 and the second magnetic disk 2032 through the setting of the limit screw 207 and the limit slider 210, so the above-mentioned adjustment mechanism can be set in reverse. The above technical solution of the present application is only an optimization solution, but the principles of the two are the same; in addition, the limit slider 210 in the present invention needs to return to its original position, and some elastic elements can be used. Of course, other structures can also be used to achieve that the limit slider 210 can be separated from the original position under the action of centrifugal force, so that it does not block the connection hole 203-1 on the first disk 2031, so that the screw rod can be extended into the connection hole 203-1 on the first disk 2031 during the subsequent torque limit protection; to ensure the completion of the torque limit action, when the entire device is stationary, the limit slider 210 can be pushed back to the original position. As long as such a function can be achieved and no movement or other interference problems occur with the original parts, it can be used in the present invention;Of course, for the sake of simple structure, a compression spring 209 is adopted in the present invention, that is, the compression spring 209 is connected to one side of the limit slider 210; through the self-deformation ability of the compression spring 209, the limit slider 210 can move accordingly as needed to ensure the soft start of the coupling.

[0036] In addition, as a preference, the connection hole 203-1 on the first disk 2031 in the present invention is a light hole, and the connection hole 203-1 on the second disk 2032 can be a threaded hole. Since the limit screw 207 itself has an external thread, when the connection hole 203-1 on the second disk 2032 is a threaded hole, the adjustment of its protruding length can be realized by rotating the limit screw 207, so that the coupling disclosed in the present invention has the ability to adjust the soft start time.

[0037] As a preference, the limit mechanism in the present invention further includes a limit seat 208, the limit seat 208 is connected to the first disk 2031, and the limit slider 210 is connected to the limit seat 208 through the compression spring 209; the setting of the limit seat 208 provides a placement place for the limit slider 210 and the compression spring 209. At the same time, the limit seat 208 is fixedly connected to the first disk 2031, and the connection method can be set as needed. The limit seat 208 is arranged on the side of the first disk 2031 close to the second disk 2032. Such a setting also has a certain isolation effect, reducing the direct sliding of the first disk 2031 and the second disk 2032 when the load is overloaded or blocked. Through the setting of the limit seat 208, the limit seat 208 plays an isolation role, so that the first disk 2031 and the second disk 2032 will not directly collide violently, which is beneficial to extending the service life of the permanent disk 203.

[0038] Preferably, in the present invention, the limit seat 208 includes a seat body 208-1. A placement groove 2081 is provided on one side of the seat body 208-1 close to the first magnetic disk 2031. The seat body 208-1 is horizontally provided with a through hole 2082. The through hole 2082 is coaxially arranged with the connection hole 203-1, and the through hole 2082 communicates with the placement groove 2081. In the present invention, the placement groove 2081 serves as a storage place, facilitating the arrangement of the limit slider 210 and the compression spring 209. At the same time, the placement groove 2081 also serves as a limit and guiding function. Because in the present invention, the limit slider 210 is connected to the first magnetic disk 2031 solely through a compression spring 209. Without the restriction of external parts, the limit slider 210 is prone to lateral movement, which is not conducive to actual use. Therefore, the limit seat 208 is added in the present invention. The limit seat 208 not only facilitates the arrangement of the limit slider 210 but also has a limiting effect to prevent the limit slider 210 from shifting during movement. At the same time, preferably, the diameter of the through hole 2082 in the present invention is relatively large for easy transition. As a further optimization, the through hole 2082 in the present invention is a frustum-shaped hole, with the larger opening end facing the side of the limit screw 207. Such a setting facilitates the limit screw 207 to enter the connection hole 203-1 on the first magnetic disk 2031. At this time, the through hole 2082 serves as a guiding function.

[0039] Preferably, a locking nut 206 is provided on the limit screw 207 in the present invention. The setting of the locking nut 206 can serve as a limit and support function to prevent the limit screw 207 from shaking due to impact and reduce the damage to the internal thread of the connection hole 203-1 in the second magnetic disk 2032. In addition, the locking nut 206 can serve as an external support to ensure that the limit screw 207 has greater strength and meet the strength requirements of the entire adjustment device.

[0040] Preferably, a buffer limit pad 205 is provided on the output shaft 202 in the present invention; the setting of the buffer limit pad 205 can play a good limiting role; when the load is overloaded or blocked, the first disk 2031 and the second disk 2032 slide axially away from the conductor disk on the output shaft 202; because there is a buffer limit pad 205, even if the permanent magnet disk 203 on one side slides slowly due to various reasons, it will not be affected by the permanent magnet disk 203 with a fast sliding speed, and will eventually slide to contact with the buffer limit pad 205 and stop, ensuring the reliability of the torque-limiting protection mechanism; in addition, due to the elasticity of the buffer limit pad 205, it has a flexible deceleration performance, without violent collision impact, protecting the parts and ensuring the reliability of the permanent magnet disk 203; at the same time, in the present invention, the buffer limit pad 205 is arranged at the central position of the first disk 2031 and the second disk 2032 in the static state; with such a setting, when the load is overloaded or blocked, the first disk 2031 and the second disk 2032 slide towards each other and stop after hitting the buffer limit pad 205, and the two groups of permanent magnet disks 203 will not collide violently, nor will the air gap be offset due to the slow sliding speed of one group of permanent magnet disks 203, resulting in the failure of the protection mechanism to protect the motor 3 and the load, and the high-temperature damage of the conductor rotor on that side.

[0041] Preferably, the buffer limit pad 205 in the present invention is made of rubber and plastic materials; with such a connection method, the structure is simpler and the cost is relatively low. As an optimization, the buffer limit pad 205 in the present invention can adopt the following structure. The buffer limit pad includes a fixed seat 2052, and the fixed seat 2052 is connected to the output shaft 202; compression buffer springs 2053 for buffering are provided on both sides of the fixed seat 2052; in this structure, the fixed seat 2052 plays a connecting role, and when the compression buffer springs 2053 play a buffering role, it is also convenient for subsequent return, and at the same time, the wear resistance is higher than that of the buffer limit pad 205 made of rubber and plastic materials; this connection method requires a notch to be opened on the output shaft 202, so in the present invention, a plug-in slot 2051 is provided on the output shaft 202, and the installation connection between the buffer limit pad and the output shaft 202 is realized through the connection between the plug-in slot 2051 and the fixed seat 2052; in summary, it can be found that the torque-limiting permanent magnet coupling in the present invention is provided with a buffer limit pad 205 at the middle position of the axial sliding surface of the output shaft 202, which can not only limit the sliding position of the two permanent magnet disks 203 from overstepping, but also because the permanent magnet disk 203 and the buffer limit pad 205 are in elastic contact, with small impact force, it will not cause damage to the permanent magnet disk 203, ensuring the reliable operation of the torque-limiting protection mechanism, and is beneficial to the long-term stable and reliable operation and popularization of the torque-limiting permanent magnet coupling.

[0042] Preferably, in the present invention, the input-end conductor disk component 102 and the output-end conductor disk component 104 are connected by a plurality of air-gap plates 103; each of the air-gap plates 103 is evenly distributed in an annular shape at intervals; such a setting ensures the integrity of the input-end conductor disk component 102 and the output-end conductor disk component 104. In addition, the air-gap plate 103 is a flat plate structure, and both ends are respectively connected to the input-end conductor disk component 102 and the output-end conductor disk component 104; at the same time, the air-gap plates 103 are distributed at intervals, and the gaps between the air-gap plates 103 facilitate subsequent inspection and assembly.

[0043] The specific implementation manner of the torque-limiting permanent magnet coupling in the present invention is as follows:

[0044] A torque-limiting permanent magnet coupling with adjustable soft-start time, as shown in the attached drawings, includes a conductor rotor component 1 coaxially installed on the output shaft 202 of the prime mover and a permanent magnet rotor component 2 installed on the load input shaft. The conductor rotor component 1 includes a first shaft sleeve 101 connected to the prime mover, an input-end conductor disk component 102, an output-end conductor disk component 104, and an air-gap plate 103 connecting the two conductor disk components. The permanent magnet rotor component 2 includes a second shaft sleeve 201 connected to the load, an output shaft 202, a first magnetic disk 2031, a second magnetic disk 2032, a shaft-end baffle 204, a buffer limit pad 205 installed at the middle position of the axial sliding surface of the output shaft 202, an adjustable limit screw 207 installed on the back of the permanent magnetic disk 203, a nut for locking the screw, a limit slider 210, a compression spring 209, and a limit seat 208 for installing the limit slider 210 and the compression spring 209.

[0045] Generally, the operating state of the torque-limiting permanent magnet coupling is as follows:

[0046] In the stationary state, under the action of the compression spring 209, the limit slider 210 is in a position covering the light hole on the first magnetic disk 2031. The distance between the outer surface of the limit slider 210 and the end of the limit screw 207 is L1, and the air gap between the conductor disk and the permanent magnetic disk 203 is δmin;

[0047] During startup; the first magnetic disk 2031 and the second magnetic disk 2032 slide away from the conductor disk in opposite directions. Since the permanent magnet rotor component 2 is still in a stationary state at this time, the end of the limit screw 207 abuts against the limit slider 210, preventing the first magnetic disk 2031 and the second magnetic disk 2032 from continuing to slide in opposite directions and keeping the air gap δs1 at startup constant. At this time, since the air gap increases from δmin to δs1, the torque transmission capacity decreases, realizing the soft-start function;

[0048] After startup is completed, under the action of suction force, the permanent magnet disk 203 returns to its original position, and the air gap is δmin; under the action of centrifugal force, the limit slider 210 overcomes the acting force of the compression spring 209 and leaves its original position blocking the connection hole 203-1 on the first disk 2031, making way for the limit screw 207 to penetrate into the connection hole 203-1 on the first disk 2031 during the torque limit protection action;

[0049] When the torque limit protection action occurs, the first disk 2031 and the second disk 2032 continue to slide away from the conductor disk towards each other. Due to the absence of the obstruction of the limit slider 210, the limit screw 207 penetrates into the light hole, causing the air gap to increase from δmin to δmax, cutting off the torque transmission, thereby protecting the motor and the load equipment.

[0050] In the case of extending the soft start time:

[0051] Loosen the lock nut 206, screw the limit screw 207 into the connection hole 203-1 of the second disk 2032, so that the distance between the outer surface of the limit slider 210 and the end of the limit screw 207 increases from L1 to L2 ( Figure 7 ), and the air gap between the conductor disk and the permanent magnet disk 203 remains δmin, then tighten the nut again.

[0052] During startup, the first disk 2031 and the second disk 2032 slide away from the conductor disk towards each other. Since the permanent magnet rotor component 2 is still in a static state at this time, the end of the limit screw 207 abuts against the limit slider 210, preventing the permanent magnet disk 203 from continuing to slide, and keeping the air gap δs2 at startup constant. At this time, since the air gap increases from δmin to δs2, the torque transmission capacity decreases, realizing the soft start function. Since δs2 is larger than δs1, the torque transmission capacity decreases more, and the soft start effect is better; therefore, by appropriately adjusting the value of L2, a more appropriate soft start time can be obtained to match the startup requirements of the equipment.

[0053] Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A driving system for a rotary mechanism of a door machine, characterized in that, It includes a motor; the motor is connected to the reducer through a torque-limiting permanent magnetic coupling; The torque-limiting permanent magnetic coupling is connected to the motor shaft through a connecting piece; the torque-limiting permanent magnetic coupling includes a permanent magnetic rotor component, the permanent magnetic rotor component includes a shaft sleeve, and the torque-limiting permanent magnetic coupling is connected to the reducer shaft through the shaft sleeve; a brake wheel is provided on the shaft sleeve; The torque-limiting permanent magnetic coupling comprises a conductor rotor component and a permanent magnetic rotor component, wherein the permanent magnetic rotor component comprises an output shaft; a permanent magnetic disk is sleeved on the output shaft; the conductor rotor component comprises an input-end conductor disk component and an output-end conductor disk component; the input-end conductor disk component and the output-end conductor disk component are distributed on both sides of the permanent magnetic disk; the permanent magnetic disk comprises a first magnetic disk and a second magnetic disk; an adjustment mechanism is provided between the first magnetic disk and the second magnetic disk; The adjustment mechanism includes a connecting hole provided on the first disk and the second disk, the second disk is connected to a limit screw through the connecting hole; the limit screw is coaxially arranged with the connecting hole on the first disk; the first disk is provided with a limit mechanism used in conjunction with the limit screw, the limit mechanism includes a limit slider for limiting the lateral movement of the limit screw; One side of the limiting slider is connected with a compression spring.

2. The drive system of a door machine slewing mechanism according to claim 1, characterized in that, The limiting mechanism further comprises a limiting seat, the limiting seat is connected to the first magnetic disk, and the limiting slider is connected to the limiting seat via a compression spring.

3. The driving system of the slewing mechanism of a portal crane according to claim 2, characterized in that The limiting seat comprises a seat body, a placement groove is arranged on a side of the seat body close to the first disk, a through hole is arranged transversely on the seat body, the through hole is coaxially arranged with the connecting hole, and the through hole is communicated with the placement groove.

4. A driving system for a door machine slewing mechanism according to claim 1, characterized in that, A locking nut is arranged on the limiting screw.

5. A driving system for a slewing mechanism of a portal crane, characterized in that, The output shaft is provided with a buffering and limiting pad; the buffering and limiting pad is arranged at the center position of the first disk and the second disk in a stationary state.

6. The driving system of the slewing mechanism of a portal crane according to claim 5, characterized in that, The buffering and limiting pad is made of rubber and plastic material.

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