CN217427961U

CN217427961U - Barrel type torque-limiting permanent magnet coupler

Info

Publication number: CN217427961U
Application number: CN202221202922.7U
Authority: CN
Inventors: 孙军红; 李铁梅; 黄海林; 唐国和; 李小明; 吴立平
Original assignee: HUNAN ZHONGTE HYDRAULIC ROTARY TRANSMISSION MACHINE CO Ltd
Current assignee: HUNAN ZHONGTE HYDRAULIC ROTARY TRANSMISSION MACHINE CO Ltd
Priority date: 2022-05-19
Filing date: 2022-05-19
Publication date: 2022-09-13
Anticipated expiration: 2032-05-19

Abstract

The utility model discloses a cylinder limit square permanent magnet coupler of soft start and overload limit square protection of realization to equipment, it includes as the inner rotor of driven end, and the inner rotor periphery is equipped with the iron core, inlays on the iron core and is equipped with induction winding, and characterized by induction winding's two leading-out terminal chains have connect variable resistance, variable resistance's resistance is adjusted by resistance adjusting device, resistance adjusting device adjusts variable resistance to permanent magnet coupler's different operating mode, makes the induced-current through in induction winding's the conductive circuit change in the operating current scope of settlement to make permanent magnet coupler under different operating modes, its transmission moment of torsion obtains automatically regulated and tends to invariable, realizes the soft start and the overload limit square protection of equipment; the utility model discloses the principle is reliable, and simple structure realizes easily, but wide application must soft start's equipment such as belt conveyor, lifting machine and must improve the various big inertia equipment of start-up performance such as ball mill, blendor, breaker.

Description

Barrel type torque-limiting permanent magnet coupler

Technical Field

The utility model relates to an asynchronous formula limit for distance type permanent magnet coupler, specifically speaking are cylinder limit for distance type permanent magnet coupler, especially relate to a cylinder limit for distance type permanent magnet coupler who realizes soft start and overload limit for distance protection to equipment.

Background

The permanent magnet magnetic transmission is a novel transmission mode developed at the end of the last century and has two main types, namely a synchronous type and an asynchronous type. The synchronous type realizes non-rigid connection synchronous transmission by utilizing attraction (or repulsion) force between permanent magnets, and is mainly used as a torque-limited safety coupling. The asynchronous transmission realizes non-rigid connection asynchronous transmission by utilizing the magnetic-electric-magnetic induction force between the permanent magnet and the electric conductor, and is used as a transmission element with certain soft start characteristic and torque limit protection in recent years besides being used as a safety coupling. The hydraulic coupler has the characteristics of no liquid spraying pollution, larger installation coaxiality error allowed by installation and adjustment, simplicity and convenience in maintenance and the like, and is widely applied as a substitute product of the hydraulic coupler.

However, the above products still have the following drawbacks: one is that the so-called "soft" start-up feature is extremely limited. Although the torque-limiting permanent magnet coupler is not rigidly connected, the transmission torque at the initial moment of starting is zero or close to zero, but the load is connected before the motor enters a stable working condition area along with the increase of the rotating speed of the motor, so that the starting is difficult to complete, namely, the load is rigidly connected in the middle and later stages of the starting process of the motor, and the equipment is rigidly started by the driving torque of the motor. The second is so-called "torque limit" protection, which is mostly "torque loss" protection. That is, when the driven end of the disk type permanent magnet coupler stalls due to severe overload of equipment, the induced axial thrust formed by the huge rotational speed difference can cause the permanent magnet and the electric conductor (induction disk) to be separated suddenly, so that the driving torque of the permanent magnet coupler disappears suddenly or is reduced to a minimum value suddenly, and a torque cliff type protection state is presented, and the cliff type protection is quite terrible for some types of equipment. For example, if a torque-limiting permanent magnet coupler is in a torque-loss protection state, a motor is in a running state to enable a brake to have no braking action, and when a backstop is not installed or fails, the material regret is extremely troublesome and even causes a malignant accident.

Disclosure of Invention

The utility model aims at providing a cylindrical torque-limiting permanent magnet coupler which realizes the soft start and overload torque-limiting protection of equipment; in the initial stage of starting the equipment, only a small transmission torque is generated, so that the motor can be quickly started under a low-load condition to reach a rated rotating speed, the transmission torque of the permanent magnet coupler is gradually increased to a constant value along with the acceleration of the equipment, and the equipment is flexibly accelerated under the constant torque condition until the equipment is started and enters a rated working condition; and when the equipment is seriously overloaded and the rotating speed of the load end is obviously reduced, the permanent magnet coupler automatically limits the increase amplitude of the transmission torque of the permanent magnet coupler so as to realize overload torque limiting protection on the motor and the transmission system.

The utility model discloses an adopt following technical scheme to realize its purpose, it has the variable resistance to draw forth the terminal chain in two of induction winding, the centrifugal force that utilizes the object to receive when different rotational speeds is different, automatically regulated includes the resistance of variable resistance that clusters in the conductive loop of induction winding (namely along with the crescent of centrifugal force, the resistance of variable resistance that clusters in the conductive loop reduces gradually, along with the diminishing of centrifugal force, the resistance of variable resistance that clusters in the conductive loop increases gradually), make induction winding produce under the different induced electromotive force of permanent magnet coupler, induced-current change in its conductive loop is little, thereby make permanent magnet coupler transmission moment of torsion obtain automatically regulated, all change in the small range and tend to invariable, realize the soft start and the overload limit moment protection of equipment.

A cylinder torque-limiting permanent magnet coupler comprises an outer rotor as a driving end and an inner rotor as a driven end, wherein permanent magnets are embedded in the outer rotor along the circumference, an iron core is arranged on the outer periphery of the inner rotor, an induction winding is embedded in the iron core, variable resistors are connected to two leading-out terminals of the induction winding in a series connection mode, the resistance values of the variable resistors are adjusted by a resistor adjusting device, the resistor adjusting device adjusts the resistance values of the variable resistors according to different working conditions of the permanent magnet coupler, namely the resistance values of the variable resistors are gradually reduced along with the gradual increase of centrifugal force, the resistance values of the resistors connected in a conductive loop are gradually increased along with the gradual decrease of the centrifugal force, the induced current in the conductive loop comprising the induction winding is changed in a set working current range, and therefore the transmission torque of the permanent magnet coupler is automatically adjusted and tends to be constant under different working conditions, soft start and overload torque limit protection of the equipment are realized.

The resistance adjusting device comprises a U-shaped resistance plate arranged on an inner rotor, two leading-out terminals of an induction winding are respectively connected with the U-shaped resistance plate, the inner rotor is provided with a radial guide rail along the radial direction, a centrifugal slider sliding on the radial guide rail is arranged on the radial guide rail, the centrifugal slider is provided with two sliding conductive contacts respectively contacted with the U-shaped resistance plate, so that the induction winding, the U-shaped resistance plate and the sliding conductive contacts form a conductive loop, one end of the centrifugal slider is provided with an extension spring, the other end of the extension spring is connected on the inner rotor, and the centrifugal slider is pulled to the center part of the inner rotor; when the inner rotor is in different rotating speeds, the centrifugal force applied to the centrifugal slider is different, the position where the centrifugal slider is balanced with the tension of the extension spring is different, namely the contact positions of the two sliding conductive contacts on the centrifugal slider and the U-shaped resistance plate are different, so that the resistance values of the variable resistors connected in series in the conductive loop are different.

After getting into rated operating mode for making equipment accomplish the start-up, the resistance of cluster resistance is zero in the conductive loop, the utility model discloses two terminals of induction winding are connected with U type resistance board respectively through two short circuit contacts, and induction winding, short circuit contact, U type resistance board, slip conductive contact constitute a conductive loop promptly.

In order to conveniently adjust the resistance value of the resistor connected in the conductive loop, the inner rotor of the utility model is provided with a stop block, and the extension spring is arranged on the stop block through a spring bracket; the initial tension of the tension spring and the initial position of the centrifugal slider are adjusted by the mounting position of the stop.

For the convenience adjust centrifugal force size, be equipped with counter weight adjusting screw on the centrifugal slider for adjust centrifugal slider's quality.

Due to the adoption of the technical scheme, the utility model discloses better realization invention purpose, its principle is reliable, and simple structure realizes easily, but wide application in must soft start's equipment such as belt conveyor, lifting machine and must improve various big inertia equipment of startability such as ball mill, blendor, breaker.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic view of the position of the sliding conductive contact in a resting state of the invention;

FIG. 3 is a schematic view of the position of the sliding conductive contact during a start-up or overload transition condition of the present invention;

fig. 4 is a schematic view of the position of the sliding conductive contact in the rated operation state of the present invention.

1. The main coupling joint 2, the extension spring 3, the spring frame 4, the counterweight adjusting screw 5, the radial guide rail 6, the centrifugal slider 7, the induction winding 8, the outer rotor 9, the permanent magnet 10, the iron core 11, the short-circuit contact 12, the stop 13, the U-shaped resistance plate 14, the sliding conductive contact 15, the auxiliary coupling joint 16 and the inner rotor.

Detailed Description

The present invention will be further explained with reference to the drawings and the embodiments.

As can be seen from fig. 1, a cylindrical torque-limiting permanent magnet coupler comprises an outer rotor 8 as a driving end and an inner rotor 16 as a driven end, wherein the outer rotor 8 is connected with a main coupling 1, the inner rotor 16 is connected with a driven coupling 15, permanent magnets 9 are embedded in the outer rotor 8 along the circumference, an iron core 10 is arranged on the outer circumference of the inner rotor 16, an induction winding 7 is embedded on the iron core 10, two leading-out terminals of the induction winding 7 are connected with variable resistors in series, the resistance values of the variable resistors are adjusted by a resistance adjusting device, the resistance adjusting device adjusts the resistance values of the variable resistors according to different working conditions of the permanent magnet coupler, namely, the resistance values of the variable resistors are gradually reduced along with the gradual increase of centrifugal force, the resistance values of the variable resistors in a conductive circuit are gradually increased along with the gradual decrease of centrifugal force, and induced current in the conductive circuit including the induction winding 7 is changed within a set working current range, therefore, the transmission torque of the permanent magnet coupler is automatically adjusted and tends to be constant under different working conditions, and soft starting and overload torque limiting protection of equipment are realized.

The resistance adjusting device of the utility model comprises a U-shaped resistance plate 13 arranged on an inner rotor 16, two leading-out terminals of an induction winding 7 are respectively connected with the U-shaped resistance plate 13, the inner rotor 16 is provided with a radial guide rail 5 along the radial direction, the radial guide rail 5 is provided with a centrifugal slider 6 sliding thereon, the centrifugal slider 6 is provided with two sliding conductive contacts 14 respectively contacting with the U-shaped resistance plate 13, so that the induction winding 7, the U-shaped resistance plate 13 and the sliding conductive contacts 14 form a conductive loop, one end of the centrifugal slider 6 is provided with an extension spring 2, the other end of the extension spring 2 is connected on the inner rotor 16, and the centrifugal slider 6 is pulled to the center part of the inner rotor 16; when the inner rotor 16 is in different rotating speeds, the centrifugal force applied to the centrifugal slider 6 is also different, and the position where the centrifugal slider is balanced with the tension of the tension spring 2 is also different, that is, the contact positions of the two sliding conductive contacts 14 on the centrifugal slider 6 and the U-shaped resistance plate 13 are also different, so that the resistance values of the variable resistors connected in series in the conductive loop are also different.

After getting into rated operating mode for making equipment to accomplish the start-up, the resistance of bunching is zero in the conductive loop, the utility model discloses two terminals of induction winding 7 are connected with U type resistance board 13 respectively through two short circuit contact 11, and induction winding 7, short circuit contact 11, U type resistance board 13, slip conductive contact 14 constitute a conductive loop promptly.

In order to conveniently adjust the resistance value of the series resistor in the conductive loop, the inner rotor 16 of the utility model is provided with a stop block 12, and the extension spring 2 is arranged on the stop block 12 through the spring frame 3; the initial tension of the tension spring 2 and the initial position of the centrifugal slider 6 are adjusted by the installation position of the stop 12.

For the convenience adjust centrifugal force size, be equipped with counter weight adjusting screw 4 on centrifugal slider 6 for adjust centrifugal slider 6's quality.

As can be seen from figure 2, the utility model discloses before equipment starts, centrifugal slider 6 is in initial position under extension spring 2's pulling force effect, and the variable resistance value that cluster is biggest in the conductive loop this moment. As can be seen from fig. 3 and 4, when the device is started, the motor starts to rotate with the outer rotor 8, and at this time, a rotational speed difference is generated between the outer rotor 8 and the inner rotor 16, and an induced electromotive force is generated in the induction winding 7; at this time, the resistance value of the variable resistor connected in series with the conductive loop is the largest, so that the induced current passing through the conductive loop is very weak, and the transmission torque formed between the outer rotor 8 and the inner rotor 16 is also extremely small, so that the motor can rapidly accelerate to pass through the torque peak value rotating speed and enter a stable working condition area to complete starting. As the difference in rotational speed between the inner rotor 16 and the outer rotor 8 increases, the torque transmitted by the permanent magnet coupling also increases gradually and starts to accelerate against the initial value torque of the device. When the inner rotor 16 rotates with the acceleration of the equipment, the centrifugal slider 6 overcomes the tension of the extension spring 2 under the action of centrifugal force and moves outwards along the radial direction of the radial guide rail 5, and the sliding conductive contact 14 moves to the short-circuit contact 11 gradually along with the U-shaped resistance plate 13, so that the resistance value of the variable resistor connected in the conductive loop is gradually reduced to zero; although the difference between the rotation speeds of the inner rotor 16 and the outer rotor 8 is gradually reduced in the process, the induced electromotive force generated by the induction winding 7 is also reduced, but the resistance value of the variable resistor connected in the conductive loop is gradually reduced to zero along with the increase of the rotation speed of the inner rotor 16, so that the change of the induced current in the conductive loop is not large, and the transmission torque generated between the inner rotor 16 and the outer rotor 8 is only changed in a small range. After equipment accomplishes the start-up and gets into rated operating mode, 16 rotational speeds of inner rotor reach the rated load, and rated rotational speed difference is very little between outer rotor 8 and inner rotor 16, also enables the utility model discloses permanent magnet coupler transmits rated torque at rated operating mode.

When the equipment is overloaded, the rotating speed difference between the inner rotor 16 and the outer rotor 8 of the permanent magnet coupler is increased, so that the transmission torque of the permanent magnet coupler is increased to overcome the overload returning to the rated condition; if the overload of the equipment continues to increase, the rotating speed of the inner rotor 16 continuously decreases, the centrifugal force borne by the centrifugal slider 6 is reduced, and the centrifugal slider starts to slide towards the core of the inner rotor 16, so that the resistance value of the variable resistor connected in the conductive loop is gradually increased until the maximum value is reached, although the induced electromotive force generated by the induction winding 7 in the process is increased along with the increase of the rotating speed difference between the inner rotor 16 and the outer rotor 8, the induced current does not change greatly due to the increase of the variable resistor connected in the conductive loop, so that the torque transmitted between the inner rotor 16 and the outer rotor 8 is limited within a certain range, and a good torque limiting protection effect is achieved on the whole transmission system.

The utility model discloses a reasonable selection U type resistance board 13's resistance value, adjust extension spring 2's rigidity and initial pulling force, adjustment centrifugal slider 6's quality and initial and termination point, alright conveniently according to permanent magnet coupler transmitted power size and equipment to the requirement of start-up, limit square protection, the overload coefficient when adjusting permanent magnet coupler start-up characteristic's soft or hard and limit square protection.

The utility model only generates very small transmission torque at the initial stage of equipment starting, so that the motor can quickly finish starting under the condition of low load to reach the rated rotating speed, and the transmission torque of the permanent magnet coupler is gradually increased to a constant value along with the acceleration of the equipment, so that the equipment can flexibly accelerate under the condition of constant torque until the equipment is started to enter the rated working condition; and when the equipment is seriously overloaded and the rotating speed of the load end is obviously reduced, the permanent magnet coupler automatically limits the increase amplitude of the transmission torque of the permanent magnet coupler so as to realize overload torque limiting protection on the motor and the transmission system. The device can be widely applied to equipment needing soft start, such as a belt conveyor, a lifter and the like, and various large-inertia equipment needing improved start performance, such as a ball mill, a mixer, a crusher and the like.

Claims

1. A cylinder torque-limiting permanent magnet coupler comprises an outer rotor as a driving end and an inner rotor as a driven end, wherein permanent magnets are embedded in the outer rotor along the circumference, an iron core is arranged on the outer periphery of the inner rotor, and an induction winding is embedded on the iron core, and the torque-limiting permanent magnet coupler is characterized in that two leading-out terminals of the induction winding are connected with variable resistors in series, the resistance values of the variable resistors are adjusted by a resistance adjusting device, the resistance adjusting device adjusts the resistance values of the variable resistors according to different working conditions of the permanent magnet coupler, namely the resistance values of the variable resistors are gradually reduced along with the gradual increase of centrifugal force, the resistance values of the resistors connected in a conductive loop are gradually increased along with the gradual decrease of the centrifugal force, and induced current in the conductive loop comprising the induction winding is changed in a set working current range, so that the transmission torque of the permanent magnet coupler is automatically adjusted and tends to be constant under different working conditions, soft start and overload torque limit protection of the equipment are realized.

2. The cylindrical torque-limiting permanent magnet coupler of claim 1, wherein the resistance adjusting device comprises a U-shaped resistance plate mounted on the inner rotor, two leading terminals of the induction winding are respectively connected with the U-shaped resistance plate, the inner rotor is provided with a radial guide rail in the radial direction, the radial guide rail is provided with a centrifugal slider sliding thereon, the centrifugal slider is provided with two sliding conductive contacts respectively contacting with the U-shaped resistance plate, so that the induction winding, the U-shaped resistance plate and the sliding conductive contacts form a conductive loop, one end of the centrifugal slider is provided with an extension spring, and the other end of the extension spring is connected to the inner rotor to pull the centrifugal slider toward the center of the inner rotor; when the inner rotor is in different rotating speeds, the centrifugal force applied to the centrifugal slider is different, the position where the centrifugal slider is balanced with the tension of the extension spring is different, namely the contact positions of the two sliding conductive contacts on the centrifugal slider and the U-shaped resistance plate are different, so that the resistance values of the variable resistors connected in series in the conductive loop are different.

3. The torque-limiting cylindrical permanent magnet coupler of claim 2, wherein the two terminals of the inductive winding are connected to the U-shaped resistive plate through two shorting contacts, respectively, i.e., the inductive winding, the shorting contacts, the U-shaped resistive plate, and the sliding conductive contacts form a conductive loop.

4. The barrel type torque-limiting permanent magnet coupler of claim 2, wherein a stop block is mounted on the inner rotor, and the extension spring is mounted on the stop block through a spring holder; the initial tension of the tension spring and the initial position of the centrifugal slider are adjusted by the mounting position of the stop.

5. The torque-limiting permanent magnet cylinder coupler of claim 2, wherein said centrifugal slider has a weight adjustment screw for adjusting the mass of the centrifugal slider.