Direct-driven screw conveyor and regulation and control method

Abstract

The invention relates to the technical field of spiral conveyors, and discloses a direct-drive type spiral conveyor and a regulation and control method.The direct-drive type spiral conveyor comprises a driving assembly and a conveying barrel, the driving assembly comprises a driving rotating shaft and an annular motor, the annular motor comprises a rotor, a stator and a motor shell, the rotor is arranged on the driving rotating shaft in a sleeving mode, and the stator is arranged on the motor shell in a sleeving mode; the stator is fixed to the motor shell, the rotor and the stator are oppositely arranged, the rotor is driven to move through electromagnetic induction, and the driving rotating shaft is driven. The conveying barrel comprises a spiral shaft, one end of the spiral shaft is connected with the driving rotating shaft, and materials are conveyed through rotation of the spiral shaft under driving of the driving rotating shaft. According to the scheme, the annular motor comprising the stator and the rotor is used for driving the spiral conveyor in an electromagnetic induction mode, transmission structures such as a coupler and a speed reducer in the original design are replaced, and therefore the equipment maintenance cost is reduced, and the material conveying efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of screw conveyor technology, and specifically to a direct-drive screw conveyor and its control method. Background Technology

[0002] Screw conveyors are important material conveying equipment widely used in industries such as chemical, food, and metallurgy. Traditional screw conveyors typically use a motor to drive the screw shaft to rotate through intermediate transmission devices such as couplings and reducers, thereby achieving material conveying.

[0003] In related technologies, this traditional driving method has many drawbacks. For example, the presence of intermediate transmission devices leads to significant energy loss and low transmission efficiency. Furthermore, due to the large number of transmission components, the equipment requires a large amount of maintenance and has a high failure rate, thereby increasing equipment maintenance costs and reducing material conveying efficiency. Summary of the Invention

[0004] In view of this, the present invention provides a direct-drive screw conveyor and a control method to solve the technical problems of high maintenance costs and low conveying efficiency.

[0005] In a first aspect, the present invention provides a direct-drive screw conveyor, comprising: a drive assembly and a conveying cylinder, wherein the drive assembly comprises: a drive shaft and a ring motor, the ring motor comprising a rotor, a stator, and a motor housing, the rotor being sleeved on the drive shaft and connected to the drive shaft by a key, the stator being fixed inside the motor housing, the rotor and the stator being arranged opposite to each other, and the rotor being driven to move by electromagnetic induction, thereby driving the drive shaft; the conveying cylinder comprises: a screw shaft, one end of which is connected to the drive shaft, and under the drive of the drive shaft, the material is conveyed by rotating the screw shaft.

[0006] In conjunction with the first aspect, in one possible implementation of the first aspect, the drive assembly further includes: a thrust bearing and a bearing end cover, wherein the drive shaft is connected to the thrust bearing, and the thrust bearing is installed in the bearing housing; the bearing end cover is connected to the bearing housing by end cover fixing bolts, and the bearing housing is fixed to the motor housing by housing connecting bolts.

[0007] In conjunction with the first aspect, in one possible implementation of the first aspect, the thrust bearing is lubricated via an oil filler and an oil inlet.

[0008] In conjunction with the first aspect, in one possible implementation of the first aspect, the drive assembly is mounted on the drive assembly support, and a first spiral end seal is provided between the drive shaft and the conveying cylinder for sealing; a first motor seal and a second motor seal are provided at both ends of the stator and the rotor, and a bearing end cover sealing gasket is provided between the bearing end cover and the bearing seat.

[0009] In conjunction with the first aspect, in one possible implementation of the first aspect, a bearing is provided at the other end of the spiral shaft, the bearing is installed in a bearing housing, and the bearing is fixed by a spring retaining ring; an end cover is provided at the end, the end cover is connected to the bearing housing by an end cover connecting bolt, and an end cover sealing gasket is provided between the end cover and the bearing housing.

[0010] In conjunction with the first aspect, in one possible implementation of the first aspect, the conveying cylinder further includes: a feed inlet and a discharge outlet, wherein rotating blades are fixed on the spiral shaft, and the spacing between the rotating blades is different, with the spacing between the rotating blades near the feed inlet being smaller and the spacing between the rotating blades near the discharge outlet being larger.

[0011] In conjunction with the first aspect, in one possible implementation of the first aspect, a liner is provided on the inner wall of the conveying cylinder to reduce wear on the inner wall of the conveying cylinder caused by the material.

[0012] In conjunction with the first aspect, in one possible implementation of the first aspect, the direct-drive screw conveyor further includes: a frequency converter, wherein the frequency converter is connected to the ring motor and is used to control the speed of the ring motor; the frequency converter includes: a speed sensor and a current sensor, wherein the speed sensor is used to detect the speed of the screw in real time, and the current sensor is used to detect the operating current of the ring motor in real time.

[0013] In conjunction with the first aspect, one possible implementation of the first aspect also includes: a control panel connected to the frequency converter for controlling the frequency converter.

[0014] Secondly, the present invention provides a control method for a direct-drive screw conveyor, the method comprising: acquiring control commands sent by a control panel; and, based on the control commands, adjusting the output frequency and running time of a ring motor using a frequency converter.

[0015] The technical solution of this invention has the following advantages: This invention provides a direct-drive screw conveyor and its control method. The direct-drive screw conveyor includes a drive assembly and a conveying cylinder. The drive assembly includes a drive shaft and a ring motor. The ring motor includes a rotor, a stator, and a motor housing. The rotor is fitted onto the drive shaft and connected to it via a key. The stator is fixed to the motor housing. The rotor and stator are positioned opposite each other. Electromagnetic induction drives the rotor to move, thereby driving the drive shaft. The conveying cylinder includes a screw shaft, one end of which is connected to the drive shaft. Driven by the drive shaft, the screw shaft rotates to convey materials. In this process, the ring motor replaces the original couplings, reducers, etc., to form the transmission mechanism. While ensuring material transport, it greatly reduces the number of transmission components and the interaction between components, reducing the probability and difficulty of equipment replacement, thereby reducing equipment maintenance costs and improving material conveying efficiency. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a direct-drive screw conveyor according to an embodiment of the present invention; Figure 2 This is a partial enlarged view of region A of a direct-drive screw conveyor provided according to an embodiment of the present invention; Figure 3 This is a partial enlarged view of region B of a direct-drive screw conveyor according to an embodiment of the present invention; Figure 4 This is a schematic flowchart of a control method for a direct-drive screw conveyor according to an embodiment of the present invention.

[0018] Figure label: 1-Drive assembly; 2-Conveying cylinder; 3-Inlet; 4-Screw shaft; 5-Outlet; 6-Connecting bolts; 7-Installation support; 8-Control panel; 9-Variable frequency controller; 10-Power supply; 11-Connecting wires; 101-Oil inlet; 102-Bearing housing; 103-Oil inlet; 104-Thrust bearing; 105-Bearing end cap; 106 - First motor seal; 107 - Bearing end cover gasket; 108 - End cover fixing bolt; 109 - Housing connection bolt; 110 - Motor housing gasket; 111 - Drive assembly support; 112-Motor housing; 113-Stator; 114-Key; 115-First helical end seal; 116-Drive shaft; 117 - Second motor seal; 118 - Rotor; 119 - Stator fixing bolts; 201-Bearing housing; 202-Sealing fixing block; 203-Second spiral end seal; 204-Short shaft; 205 - Bearing; 206 - Bearing housing support; 207 - Oil nozzle; 208 - Oil inlet; 209 - End cover connecting bolt; 210 - End cap; 211 - Spring retaining ring; 212 - End cap sealing gasket. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This embodiment provides a direct-drive screw conveyor, such as... Figure 1 , 2 As shown, the direct-drive screw conveyor includes: a drive assembly 1 and a conveying cylinder 2, wherein, The drive assembly 1 includes a drive shaft 116 and a ring motor. The ring motor includes a rotor 118, a stator 113, and a motor housing 112. The rotor is sleeved on the drive shaft 116 and connected to the drive shaft 116 by a key 114. The stator 113 is fixed inside the motor housing 112. The rotor 116 and the stator 113 are arranged opposite to each other. The rotor 116 is driven to move by electromagnetic induction, which drives the drive shaft 116. The conveying cylinder 2 includes a screw shaft 4. One end of the screw shaft 4 is connected to the drive shaft 116. Under the drive of the drive shaft 116, the material is conveyed by the rotation of the screw shaft 4.

[0021] This invention provides a direct-drive screw conveyor and its control method. The direct-drive screw conveyor includes a drive assembly and a conveying cylinder. The drive assembly includes a drive shaft and a ring motor. The ring motor includes a rotor, a stator, and a motor housing. The rotor is fitted onto the drive shaft and connected to it via a key. The stator is fixed to the motor housing. The rotor and stator are positioned opposite each other. Electromagnetic induction drives the rotor to move, thereby driving the drive shaft. The conveying cylinder includes a screw shaft, one end of which is connected to the drive shaft. Driven by the drive shaft, the screw shaft rotates to convey materials. In this process, the ring motor replaces the original couplings, reducers, etc., to form the transmission mechanism. While ensuring material transport, it greatly reduces the number of transmission components and the interaction between components, reducing the probability and difficulty of equipment replacement, thereby reducing equipment maintenance costs and improving material conveying efficiency.

[0022] In one optional embodiment, the drive assembly 1 further includes: a thrust bearing 104 and a bearing end cap 105, wherein, The drive shaft 116 is connected to the thrust bearing 104, which is installed in the bearing housing 102. The bearing end cover 105 is connected to the bearing housing 102 by the end cover fixing bolt 108, and the bearing housing 102 is fixed to the motor housing 112 by the housing connecting bolt 109.

[0023] In one alternative embodiment, the thrust bearing 104 is lubricated via an oil filler 101 and an oil inlet 103.

[0024] In one alternative embodiment, the drive assembly 1 is mounted on the drive assembly support 111, and a first spiral end seal 115 is provided between the drive shaft 116 and the conveying cylinder 2 for sealing; a first motor seal 106 and a second motor seal 117 are provided at both ends of the stator 113 and the rotor 118, and a bearing end cover sealing gasket 107 is provided between the bearing end cover 105 and the bearing seat 102.

[0025] In one alternative embodiment, a bearing 205 is provided at the other end of the spiral shaft 4. The bearing 205 is installed in the bearing seat 201 and is fixed by a spring retaining ring 211. An end cap 210 is provided at the end. The end cap 210 is connected to the bearing seat 201 by an end cap connecting bolt 209. An end cap sealing gasket 212 is provided between the end cap 210 and the bearing seat 201.

[0026] Specifically, one end of the spiral shaft 4 is connected to the drive shaft 116. The drive shaft 116 is equipped with a thrust bearing 104. The thrust bearing 104 is lubricated through an oil nozzle 101 and an oil inlet 103. The thrust bearing 104 is installed in the bearing housing 102. The end is provided with a bearing end cover 105 and is connected to the bearing housing 102 through an end cover fixing bolt 108.

[0027] Specifically, the ring motor includes a hollow rotor 118 and a stator 113. The rotor 118 is sleeved on the drive shaft 116 and connected by a key 114. The stator 113 is fixed to the motor housing 112 by stator fixing bolts 119. The stator 113 is arranged opposite to the rotor 118. The rotor 118 is driven to move by electromagnetic induction, and the drive shaft 116 directly drives the spiral shaft 4 to rotate.

[0028] Specifically, the bearing housing 102 and the motor housing 112 are connected and fixed by housing connecting bolts 109, and sealed with motor housing sealing gasket 110. The drive assembly 1 is mounted on the drive assembly support 111. A spiral end seal 115 is provided between the drive shaft 116 and the conveying cylinder 2 for sealing. The stator 113 and the rotor 118 of the motor are provided with a first motor seal 106 and a second motor seal 117 at both ends. A bearing end cover sealing gasket 107 is provided between the bearing end cover 105 and the bearing housing 102.

[0029] In one optional embodiment, the conveying cylinder 2 further includes: an inlet 3 and an outlet 5, wherein, Rotating blades are fixed on the spiral shaft 4. The spacing between the rotating blades is different. The spacing between the rotating blades near the feed inlet 3 is smaller, and the spacing between the rotating blades near the discharge outlet 5 is larger.

[0030] Specifically, such as Figure 1-3 As shown, the spiral shaft 4 is installed inside the conveying cylinder 2, and spiral blades are fixed on the spiral shaft 4. Both ends of the spiral shaft 4 are connected to the drive shaft 116 and the short shaft 204 respectively via connecting bolts 6. The spiral blades adopt a variable pitch design, with a smaller pitch near the feed inlet 3 and a gradually increasing pitch near the discharge outlet 5. This variable pitch design allows the material to be gradually compressed during conveying, improving the material conveying efficiency.

[0031] Specifically, a bearing 205 is provided at the end of the short shaft 204. The bearing 205 is installed in the bearing housing 201, which is mounted on the bearing housing support 206. The bearing 205 is fixed by a spring retaining ring 211 and sealed with a sealing block 202. The bearing 205 is lubricated through an oil nozzle 207 and an oil inlet 208. An end cap 210 is provided at the end of the short shaft 204. The end cap 210 is connected to the bearing housing 201 by an end cap connecting bolt 209. An end cap sealing gasket 212 is provided between the end cap 210 and the bearing housing 201.

[0032] In one alternative implementation, such as Figure 1-3 As shown, the two ends of the screw shaft 4 are provided with a first screw end seal 115 and a second screw end seal 203. The sealing device adopts mechanical seal or labyrinth seal to prevent material leakage and ensure the normal operation of the screw conveyor.

[0033] In one alternative embodiment, the inner wall of the conveying cylinder 2 is provided with a liner to reduce the wear of the material on the inner wall of the conveying cylinder.

[0034] Specifically, such as Figure 1 As shown, the conveying cylinder 2 has a cylindrical structure, with a feed inlet 3 at one end and a discharge outlet 5 at the other end, thus forming a material conveying channel. The inner wall of the conveying cylinder 2 is lined with wear-resistant plates made of high-hardness, high-wear-resistance materials, such as manganese steel and ceramics, which can effectively reduce the wear of materials on the inner wall of the conveying cylinder 2 and extend the service life of the conveying cylinder 2.

[0035] In one alternative embodiment, the driven screw conveyor further includes: a frequency converter 9, wherein... The frequency converter 9 is connected to the ring motor and is used to control the speed of the ring motor. The frequency converter 9 includes a speed sensor and a current sensor. The speed sensor is used to detect the speed of the screw in real time, and the current sensor is used to detect the operating current of the ring motor in real time.

[0036] In one alternative embodiment, it further includes a control panel 8, which is connected to the frequency converter 9 and is used to control the frequency converter 9.

[0037] Specifically, such as Figure 1 As shown, the frequency converter 9 is electrically connected to the ring motor and is used to control the speed of the ring motor, thereby adjusting the material conveying speed of the screw conveyor. The frequency converter 9 is equipped with a speed sensor and a current sensor. The speed sensor monitors the speed of the screw shaft 4 in real time, and the current sensor monitors the operating current of the ring motor in real time. Based on the signals fed back from the speed sensor and the current sensor, the frequency converter 9 can automatically adjust the output frequency of the ring motor to ensure the stable operation of the screw conveyor.

[0038] Specifically, the screw conveyor also includes a control panel 8, which is electrically connected to the frequency converter 9. Operators can use the control panel 8 to set parameters such as the conveying speed and running time of the screw conveyor, enabling remote control and automated operation. The power supply 10 provides power, and the connecting wire 11 connects the frequency converter 9 to the screw conveyor.

[0039] In one alternative embodiment, the screw conveyor further includes a mounting support 7, which is disposed below the conveying cylinder 2 to support the entire screw conveyor. The mounting support 7 is provided with shock-absorbing rubber pads to reduce vibration and noise generated during the operation of the screw conveyor.

[0040] According to an embodiment of the present invention, a method for controlling a direct-drive screw conveyor is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0041] This embodiment provides a control method for a direct-drive screw conveyor, such as... Figure 4 As shown, the method includes the following steps: S301. Obtain control commands sent by the control panel.

[0042] Specifically, control commands sent from the control panel can be generated by operators on the control panel, such as setting parameters like the conveying speed and running time of the screw conveyor.

[0043] S302. Based on control commands, the output frequency and running time of the ring motor are adjusted using a frequency converter.

[0044] Specifically, adjusting the output frequency and running time of the ring motor using a frequency converter based on control commands refers to regulating the output frequency and running time of the ring motor in response to control commands sent from the control panel. The output frequency of the ring motor is related to the rotational speed of the screw shaft, i.e., it is related to the material conveying speed. For details, please refer to the above embodiments; further elaboration will not be repeated here.

[0045] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implements the methods shown in the above embodiments.

[0046] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A direct-drive screw conveyor, characterized in that, The direct-drive screw conveyor includes: a drive assembly (1) and a conveying cylinder (2), wherein... The drive assembly (1) includes: a drive shaft (116) and a ring motor. The ring motor includes a rotor (118), a stator (113), and a motor housing (112). The rotor (118) is sleeved on the drive shaft (116) and connected to the drive shaft (116) by a key (114). The stator (113) is fixed inside the motor housing (112). The rotor (118) is arranged opposite to the stator (113). The rotor (118) is driven to move by electromagnetic induction, which drives the drive shaft (116) to rotate. The conveying cylinder (2) includes a spiral shaft (4), one end of which is connected to the drive shaft (116). Under the drive of the drive shaft (116), the material is conveyed by the rotation of the spiral shaft (4).

2. The direct-drive screw conveyor according to claim 1, characterized in that, The drive assembly (1) further includes: a thrust bearing (104) and a bearing end cap (105), wherein, The drive shaft (116) is connected to the thrust bearing (104), and the thrust bearing (104) is installed in the bearing housing (102); The bearing end cover (105) is connected to the bearing seat (102) by the end cover fixing bolt (108), and the bearing seat (102) is fixed to the motor housing (112) by the housing connecting bolt (109).

3. The direct-drive screw conveyor according to claim 2, characterized in that, The thrust bearing (104) is lubricated by an oil nozzle (101) and an oil inlet (103).

4. The direct-drive screw conveyor according to claim 2, characterized in that, The drive assembly (1) is mounted on the drive assembly support (111), and a first spiral end seal (115) is provided between the drive shaft (116) and the conveying cylinder (2) for sealing. The stator (113) and the rotor (118) are provided with a first motor seal (106) and a second motor seal (117) at both ends, and a bearing end cover gasket (107) is provided between the bearing end cover (105) and the bearing seat (102).

5. The direct-drive screw conveyor according to claim 2, characterized in that, The other end of the spiral shaft (4) is provided with a bearing (205), which is installed in the bearing housing (201) and is fixed by a spring retainer (211). The end is provided with an end cap (210), which is connected to the bearing seat (201) by an end cap connecting bolt (209). An end cap sealing gasket is provided between the end cap (201) and the bearing seat (201).

6. The direct-drive screw conveyor according to claim 1, characterized in that, The conveying cylinder (2) further includes: an inlet (3) and an outlet (5), wherein, Rotating blades are fixed on the spiral shaft (4). The spacing between the rotating blades is different. The spacing between the rotating blades near the feed inlet (3) is smaller, and the spacing between the rotating blades near the discharge outlet (5) is larger.

7. The direct-drive screw conveyor according to claim 6, characterized in that, The inner wall of the conveying cylinder (2) is provided with a liner to reduce the wear of the material on the inner wall of the conveying cylinder.

8. The direct-drive screw conveyor according to claim 1, characterized in that, The direct-drive screw conveyor further includes: a frequency converter (9), wherein, The frequency converter (9) is connected to the ring motor and is used to control the speed of the ring motor; The frequency converter (9) includes a speed sensor and a current sensor. The speed sensor is used to detect the speed of the screw in real time, and the current sensor is used to detect the operating current of the ring motor in real time.

9. The direct-drive screw conveyor according to claim 8, characterized in that, Also includes: Control panel (8), which is connected to the frequency converter (9) and is used to control the frequency converter (9).

10. A control method for a direct-drive screw conveyor, characterized in that, The method, applied to a direct-drive screw conveyor as described in any one of claims 1 to 9, comprises: Retrieve control commands sent from the control panel; Based on the control commands, the output frequency and running time of the ring motor are adjusted using a frequency converter.

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