Drive device and screw conveyor

Abstract

The present application discloses a driving device for driving the screw shaft of a screw conveyor, comprising: a reducer having multiple input ports and an output port; a variable motor detachably connected to the input port to drive the reducer; a ball bearing mounted on the screw conveyor; a connecting ring fixedly connected between the reducer and the ball bearing to adapt to the interface between the reducer and the ball bearing; a core shaft sleeved on the inner ring of the ball bearing to connect the screw shaft; a spline shaft fixedly connected between the core shaft and the output port to drive the core shaft to rotate. The above-mentioned arrangement can drive large-diameter screw conveyors, reduce the risk points of the reducer components, effectively resist the alternating load impact generated by the screw conveyor, correct the eccentric load generated when the screw shaft is running, ensure the stable operation of the driving device while reducing the driving cost, and has good economy. The present application also discloses a screw conveyor including the above-mentioned driving device.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel engineering, and more particularly to a driving device and a screw conveyor. Background Art

[0002] In recent years, with the expansion of urban scale, the development and utilization of underground space has also been rapidly developed. The shield machine has the characteristic of completing the tunnel excavation in one time. It has a high degree of automation, saves manpower, has a fast construction speed, and is not affected by climate. During excavation, it can control ground subsidence and reduce the impact on ground buildings. It is widely used in tunnel projects in soft soil strata.

[0003] The screw conveyor, installed at the bottom of the front shield, is a key slag discharge device for the shield machine. It can discharge slag from the pressurized, sealed soil bin and adjust the discharge volume according to the pressure value in the bin. Currently, as the excavation diameter of earth pressure balance shield machines continues to increase, in order to meet the slag discharge capacity during normal operation of the shield machine, a screw conveyor suitable for large-diameter earth pressure balance shields is needed. At the same time, the drive device of the screw conveyor should meet the characteristics of high speed, high torque, and good economic efficiency. However, the rear center drive of the screw conveyor in the existing technology is a single motor drive device that can provide high torque. This is difficult to manufacture, has poor economic efficiency, and the fixed-displacement motor has high requirements for the operating environment, making it unsuitable for high-torque alternating load impact. The rear peripheral drive of the screw conveyor is composed of three hydraulic motors, each equipped with a reducer. Due to the multiple components, the risk points of the drive device increase. When a component of the drive device is damaged, it will become a load on the system, seriously reducing the efficiency of the drive device. In addition, the drive device and the screw shaft are connected by steel, and the radial deviation during the movement of the shaft can only be corrected by the slewing support, which is prone to vibration and reduces the service life of the slewing support.

[0004] In summary, how to provide a screw conveyor drive device that meets the slag discharge requirements of a large-diameter earth pressure balance shield machine is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide a driving device and a screw conveyor, wherein the driving device of the screw conveyor has a high rotation speed and a large torque to improve the slag discharge efficiency.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A driving device for driving the screw shaft of a screw conveyor, comprising: a reducer having multiple input ports and an output port; a variable motor detachably connected to the input port and used to drive the reducer; a ball bearing for installation on the screw conveyor; a connecting ring fixedly connected between the reducer and the ball bearing and used to adapt the interface between the reducer and the ball bearing; a core shaft sleeved on the inner ring of the ball bearing and used to connect the screw shaft; and a spline shaft fixedly connected between the core shaft and the output port and used to drive the core shaft to rotate.

[0008] A driving device, the ball bearing includes a rotating ring, an inner ball and an outer ball. The end surface of the outer ball facing the spiral shaft is fixedly connected to the screw conveyor cylinder, the end surface of the inner ball facing the connecting ring is fixedly connected to the connecting ring, and the core shaft is sleeved on the inner wall of the rotating ring.

[0009] A driving device has a first hole adapted to the shape of a spline shaft at one end of the core shaft facing the reducer, a second hole adapted to the shape of the spline shaft at the output port, one end of the spline shaft is sleeved in the first hole, and the other end of the spline shaft is sleeved in the second hole.

[0010] A driving device is provided. A wear-resistant sleeve is provided on the periphery of the connection between a core shaft and a spiral shaft. One end of the wear-resistant sleeve is sleeved on the core shaft, and the other end of the wear-resistant sleeve is sleeved on the spiral shaft.

[0011] A driving device is provided. A first pin shaft for positioning is arranged between a wear-resistant sleeve and a core shaft. The axis direction of the first pin shaft is the radial direction of the core shaft.

[0012] A driving device is provided. A sealing ring is provided between a wear-resistant sleeve and a ball bearing. The sealing ring is provided on the outer periphery of the wear-resistant sleeve.

[0013] A driving device has an isolation ring between two sealing rings.

[0014] A driving device, wherein the end surface of the ball bearing facing the spiral shaft is provided with a clamping ring for axial positioning of the sealing ring.

[0015] A driving device is provided, wherein a second pin shaft for positioning is provided between a core shaft and a spiral shaft, and an axial direction of the second pin shaft is parallel to the axial direction of the core shaft.

[0016] A driving device, wherein a connecting ring is provided with a vent cap.

[0017] The present invention also provides a screw conveyor, comprising a driving device arranged at the end of a screw shaft, wherein the driving device is any one of the driving devices described above.

[0018] Compared with the above background technology, the driving device provided by the present application includes a speed reducer, a variable motor and a ball bearing. The speed reducer adopts a large speed ratio speed reducer with multiple inputs and a single output, which effectively reduces the risk points of the speed reducer components, improves safety performance and prolongs service life. The multiple input ports of the speed reducer are connected to multiple variable motors, which can reduce the driving cost while driving the large speed ratio speed reducer and providing high speed and high torque, and has good economy. The variable motor can effectively resist the alternating load impact generated when the screw conveyor is reversed and escaped, thereby ensuring the stable operation of the driving device. The ball bearing connects the speed reducer and the screw shaft on the screw conveyor, which can correct the eccentric load generated when the screw shaft is running, better adapt to the various states of the screw conveyor during the excavation process, such as normal excavation, screw machine escape, soil plugging and anti-surging, and ensure the stability of the screw conveyor. The driving device provided by the present application has high speed and high torque, solves the problem of slow slag discharge in large-diameter earth pressure balance shield machines, and improves excavation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0020] Figure 1 A structural diagram of the driving device provided by the present invention;

[0021] Figure 2 A partial structural diagram of the driving device provided by the present invention;

[0022] Figure 3 A front view of the drive device reducer provided by the present invention with three input ports;

[0023] Figure 4 A front view of a drive device reducer provided by the present invention having four input ports;

[0024] Figure 5 This is a structural block diagram of the oil circuit circulation cooling system for the reducer provided by the present invention;

[0025] Figure 6 This is the overall structural diagram of the screw conveyor provided by the present invention;

[0026] in:

[0027] 1-screw shaft, 2-reducer, 21-input port, 22-output port, 23-liquid level gauge, 3-variable motor, 4-ball bearing, 41-rotating ring, 42-inner ball, 43-outer ball, 5-connecting ring, 51-vent cap, 6-core shaft, 7-spline shaft, 8-wear-resistant sleeve, 9-first pin shaft, 10-sealing ring, 11-isolating ring, 12-pressure ring, 13-second pin shaft, 14-cylinder. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] In order to enable those skilled in the art to better understand the solutions of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0030] The driving device provided in the embodiment of the present application can be referred to in the appendix of the specification. Figure 1 To the attached Figure 6 , used to drive the screw shaft 1 of the screw conveyor, including: a reducer 2, having multiple input ports 21 and an output port 22; a variable motor 3, detachably connected to the input port 21, used to drive the reducer 2; a ball bearing 4, used to be installed on the screw conveyor; a connecting ring 5, fixedly connected between the reducer 2 and the ball bearing 4, used to adapt to the interface between the reducer 2 and the ball bearing 4; a core shaft 6, sleeved on the inner ring of the ball bearing 4, used to connect the screw shaft 1; a spline shaft 7, fixedly connected between the core shaft 6 and the output port 22, used to drive the core shaft 6 to rotate.

[0031] It should be noted that in order to meet the requirements of a drive device for a screw conveyor suitable for a large-diameter earth pressure balance shield, the drive device provided in this application provides a large-speed ratio reducer 2, which has multiple input ports 21 and is driven by multiple variable motors 3. Of course, depending on the actual situation, a large-displacement variable motor 3 can be used to replace multiple variable motors 3, or multiple small-speed ratio reducers 2 can be used to replace a single large-speed ratio reducer 2. The reducer 2 includes an oil circulation cooling system that can cool the gear oil inside the reducer 2 when the drive device is running. The reducer 2 has a liquid level gauge that can observe the level of the gear oil inside the reducer 2.

[0032] The reducer 2, the reducer level gauge 23, the oil pump, the motor, the gear oil tank, and the oil pipe together form an oil circulation cooling system. Specifically, the oil outlet on the reducer 2 is connected to the oil inlet in the oil tank through an oil pipe, and the oil outlet in the gear oil tank is connected to the oil inlet on the reducer 2 through an oil pipe, forming a closed oil circuit. A shell and tube cooler is provided in the oil tank, which is composed of multiple water pipes. By continuously injecting cold water into the water pipes, the high-temperature oil from the reducer 2 can be input into the oil tank for cooling and then output to the oil inlet of the reducer 2 at low temperature. The oil pump and the motor provide the power source for the oil circulation cooling system. At the same time, the reducer level gauge 23 is installed on the reducer 2, which can observe the position height and oil sample quality of the gear oil inside the reducer in real time.

[0033] The variable motor 3 is detachably connected to the input port 21. The output end of the variable motor 3 is splined to the input end of the reducer 2 to transmit torque and provide power to the drive device. The variable motor 3 is fixed to the output end of the variable motor 3 by the input port 21. The maximum output torque can be adjusted by adjusting the number of variable motors 3. The displacement of the variable motor 3 can be adjusted through stepless speed change, thereby adjusting the output speed of a single motor. It can also effectively resist the alternating load impact generated when the screw conveyor is reversed and unstuck, ensuring the stable operation of the drive device. Multiple variable motors 3 are connected to only one reducer 2, which can effectively reduce the risk points of the reducer components, improve safety performance, and reduce costs. The number of variable motors 3 is equal to or less than the number of input ports 21. The number of input ports 21 of the reducer 2 can be set according to actual needs. Similarly, the number of input ports 21 installed by the variable motor 3 can also be selected according to actual working conditions. The maximum output torque of the drive device can be adjusted by adjusting the number of variable motors. The displacement of the variable motor can be adjusted through stepless speed change, thereby adjusting the output speed of a single motor. In this way, the output torque of the drive device is increased by multi-drive, which satisfies the high torque demand of the drive device while effectively reducing the cost of the drive device. The input port 21 where the variable motor 3 is not installed is blocked with a sealing plate to prevent dust and other impurities from entering.

[0034] One end of ball bearing 4 is mounted on the barrel 14 of the screw conveyor, and the other end is connected to connecting ring 5. The inner ring of ball bearing 4 is sleeved on core shaft 6, supporting its rotation. Connecting ring 5 is connected to reducer 2 and ball bearing 4, connecting the different interfaces of reducer 2 and ball bearing 4 into a single unit. The output port 22 of reducer 2 and the input port of core shaft 6 are connected via a spline shaft 7. Spline shaft 7 transmits the power of reducer 2 to core shaft 6, which is then connected to screw shaft 1. Ultimately, the drive device transmits the power to screw shaft 1. Ball bearing 4 can correct the eccentric load generated by screw shaft 1 during operation, ensuring the stability of the screw conveyor.

[0035] In the specific embodiment of the present application, the connection between the variable motor 3 and the input port 21, the connection between the connecting ring 5 and the reducer 2, the connection between the connecting ring 5 and the ball bearing 4, the connection between the ball bearing 4 and the screw conveyor barrel 14, the connection between the core shaft 6 and the rotating ring 41, and the connection between the spline shaft 4 and the core shaft 6 can all be connected by threads. The threaded connection has a simple structure, is safe and reliable to install, and is economical. Of course, the above-mentioned connection method can also be connected by a key connection or a pin shaft connection, which is not specifically limited in this article. As shown in the attached specification Figure 1 To the attached Figure 2 As shown, the ball bearing 4 includes a rotating ring 41, an inner ball 42 and an outer ball 43. The end face of the outer ball 43 facing the screw shaft 1 is fixedly connected to the screw conveyor barrel 1, and the end face of the inner ball 42 facing the connecting ring 5 is fixedly connected to the connecting ring 5. The core shaft 6 is sleeved on the inner wall of the rotating ring 41.

[0036] The inner ball 42 and outer ball 43 of the ball bearing 4 are relatively fixed. Radial and axial cylindrical rollers are arranged between the rotating ring 41 and the inner ball 42, allowing for relative rotation and withstanding radial and axial forces. The inner ball 42 is bolted to the connecting ring 5, the outer ball 43 is bolted to the barrel 14, and the rotating ring 41 is bolted to the core shaft 6. This allows the core shaft 6 to rotate supported by the ball bearing 4.

[0037] As the instruction manual Figure 1 As shown, the end of the core shaft 6 facing the reducer 2 is provided with a first hole adapted to the shape of the spline shaft 7, and the output port 22 is provided with a second hole adapted to the shape of the spline shaft 7. One end of the spline shaft 7 is sleeved in the first hole, and the other end of the spline shaft 7 is sleeved in the second hole. The two ends of the spline shaft 7 can be set as non-circular shaft ends respectively inserted into the first hole and the second hole. The shape of the first hole and the second hole is the same as the shape of the shaft end of the spline shaft 7. The shaft end face of the spline shaft 7 can be rectangular, triangular or hexagonal, etc. Its specific shape is not limited in this article, as long as it can transmit the load. The threaded connection between the spline shaft 7 and the core shaft 6 can limit the axial movement of the spline shaft 7.

[0038] As the instruction manual Figure 1 To the attached Figure 2 As shown, a wear-resistant sleeve 8 is provided on the outer periphery of the connection between the core shaft 6 and the spiral shaft 1. One end of the wear-resistant sleeve 8 is sleeved on the core shaft 6, and the other end of the wear-resistant sleeve 8 is sleeved on the spiral shaft 1. The wear-resistant sleeve 8 is installed on the outer periphery of the connection between the core shaft 6 and the spiral shaft 1, which can reduce the wear of the core shaft 5 when the drive device works for a long time and extend the service life.

[0039] A first pin 9 for positioning is provided between the wear-resistant sleeve 8 and the core shaft 6, and the axial direction of the first pin 9 is the radial direction of the core shaft 6. The first pin 9 is installed on the core shaft 6 to locate the position of the wear-resistant sleeve and the core shaft, preventing the wear-resistant sleeve 8 and the core shaft 6 from generating relative movement during rotation, thereby causing wear of the core shaft 6.

[0040] As the instruction manual Figure 1 To the attached Figure 2 As shown, a sealing ring 10 is provided between the wear-resistant sleeve 8 and the ball bearing 4, and the sealing ring 10 is sleeved on the outer periphery of the wear-resistant sleeve 8. The sealing ring 10 is installed in the gap between the ball bearing 4 and the wear-resistant sleeve 8 to seal the ball bearing 4, protect the slewing bearing rotating ring inside the joint ball bearing, and prevent debris or other impurities from entering the ball bearing 4 and causing wear and failure. In order to make the seal more effective, the number of sealing rings 10 is usually multiple, and the specific number can be set according to the actual needs of the drive device. An isolation ring 11 is provided between the two sealing rings 10, and the isolation ring 11 isolates the multiple sealing rings 10 respectively, forming multiple sealing protections to improve the sealing effect.

[0041] As the instruction manual Figure 1 To the attached Figure 2 As shown, the end face of the ball bearing 4 facing the spiral shaft 1 is provided with a clamping ring 12 for axially positioning the sealing ring 10. The clamping ring 12 is mounted on the end face of the ball bearing 4 and connected to the end face of the ball bearing 4 by bolts. The clamping ring 12 is used to compress the wear-resistant sleeve 8 and the sealing ring 10. Compressing the wear-resistant sleeve 8 can prevent the wear-resistant sleeve 8 from axial movement relative to the core shaft 6, which would cause sealing failure. Compressing the sealing ring 10 can prevent the sealing ring 10 from axial sliding, which would cause sealing failure.

[0042] As the instruction manual Figure 1 To the attached Figure 2 As shown, a second pin 13 for positioning is provided between the core shaft 6 and the spiral shaft 1, and the axial direction of the second pin 13 is parallel to the axial direction of the core shaft 6. The second pin 13 is installed at the output end of the core shaft 6 and the input end of the spiral shaft 1, and can position the core shaft 6 and the spiral shaft 1 when they are connected, facilitating the rapid connection of the core shaft 6 and the spiral shaft 1 while ensuring the accuracy of the connection, and helping the core shaft 6 to transmit torque to the spiral shaft 1, thereby improving the reliability of the connection.

[0043] As the instruction manual Figure 1As shown, the connecting ring 5 is provided with a vent cap 51. The two ends of the connecting ring 5 are fixedly connected to the reducer 2 and the ball bearing 4 respectively to form a cavity. The cavity is reserved with an interface for installing the vent cap 51. The entire cavity is formed as a closed space, which can be injected with a certain amount of gear oil for lubrication. When the drive device is working, the reducer 2 drives the spline shaft 7 and the core shaft 6 to rotate together. After the lubricating gear oil has worked for a long time, the oil temperature rises and the pressure in the cavity increases. The vent cap 51 can always maintain pressure balance with the external atmosphere, avoiding excessive oil temperature and pressure that may damage the internal structure. At the same time, the vent cap 51 has a filtering effect, which can prevent external impurities from entering the ring cavity and contaminating the gear oil, thereby extending the service life of the rotating parts and the gear oil.

[0044] In addition, the screw conveyor provided in the present application includes the driving device described in the above specific embodiments. Other parts of the screw conveyor can refer to the existing technology and will not be elaborated in this article.

[0045] It should be noted that, in this specification, relational terms such as first and second, etc. are merely used to distinguish one entity from another entity, but do not necessarily require or imply any actual relationship or order between these entities.

[0046] The above is a detailed introduction to a drive device and a screw conveyor provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A driving device, characterized in that: A screw shaft (1) for driving a screw conveyor, comprising: A reducer (2) having a plurality of input ports (21) and an output port (22); a variable motor (3), detachably connected to the input port (21), and used to drive the reducer (2); A ball bearing (4) is mounted on the screw conveyor to correct an eccentric load generated when the screw shaft (1) moves; A connecting ring (5) is fixedly connected between the reducer (2) and the ball bearing (4) and is used to adapt to the interface between the reducer (2) and the ball bearing (4); A core shaft (6) is sleeved on the ball bearing (4) and is used to connect the spiral shaft (1); A spline shaft (7) is fixedly connected between the core shaft (6) and the output port (22) and is used to drive the core shaft (6) to rotate; The ball bearing (4) comprises a rotating ring (41), an inner ball (42) and an outer ball (43); the end surface of the outer ball (43) facing the screw shaft (1) is fixedly connected to the barrel (14) of the screw conveyor; the end surface of the inner ball (42) facing the connecting ring (5) is fixedly connected to the connecting ring (5); the core shaft (6) is sleeved on the inner wall of the rotating ring (41); the inner ball (42) and the outer ball (43) rotate relative to each other; radial and axial cylindrical rollers are arranged between the rotating ring (41) and the inner ball (42) for relative rotation and to withstand radial and axial forces; The end of the core shaft (6) facing the reducer (2) is provided with a first keyway adapted to the shape of the spline shaft (7), the output port (22) is provided with a second keyway adapted to the shape of the spline shaft (7), one end of the spline shaft (7) is sleeved in the first keyway, and the other end of the spline shaft (7) is sleeved in the second keyway; A wear-resistant sleeve (8) is provided on the outer periphery of the connection between the core shaft (6) and the spiral shaft (1), one end of the wear-resistant sleeve (8) is sleeved on the core shaft (6), and the other end of the wear-resistant sleeve (8) is sleeved on the spiral shaft (1); A first pin shaft (9) for positioning is provided between the wear-resistant sleeve (8) and the core shaft (6), and the axial direction of the first pin shaft (9) is the radial direction of the core shaft (6); A sealing ring (10) is provided between the wear-resistant sleeve (8) and the ball bearing (4), and the sealing ring (10) is sleeved on the outer periphery of the wear-resistant sleeve (8); An isolation ring (11) is provided between the two sealing rings (10); The end surface of the ball bearing (4) facing the spiral shaft (1) is provided with a clamping ring (12) for axially positioning the sealing ring (10); A second pin shaft (13) for positioning is provided between the core shaft (6) and the spiral shaft (1), and the axial direction of the second pin shaft (13) is parallel to the axial direction of the core shaft (6); The reducer (2) includes an oil circulation cooling system for cooling the gear oil inside the reducer (2) when the drive device is running. The oil outlet of the reducer (2) is connected to the oil inlet of the oil tank through a first oil pipe, and the oil outlet of the oil tank is connected to the oil inlet of the reducer (2) through a second oil pipe, forming a closed oil circuit. A tubular cooler is provided in the oil tank, which is composed of multiple water pipes. By continuously injecting cold water into the water pipes, high-temperature oil from the reducer (2) can be input into the oil tank for cooling and then output to the oil inlet of the reducer (2); The reducer (2) has a liquid level gauge for observing the height of the gear oil inside the reducer (2); The connecting ring (5) is provided with a vent cap (51). The two ends of the connecting ring (5) are respectively fixedly connected with the reducer (2) and the ball bearing (4) to form a cavity. An interface for installing the vent cap (51) is reserved on the cavity. The cavity is formed as a closed space and a certain amount of gear oil can be injected for lubrication. When the driving device is working, the reducer (2) drives the spline shaft (7) and the core shaft (6) to rotate together. After the lubricating gear oil works for a long time, the oil temperature rises and the pressure in the cavity increases. The vent cap (51) can always maintain pressure balance with the outside atmosphere to avoid excessive oil temperature and excessive pressure to damage the internal structure. At the same time, the vent cap (51) has a filtering effect, which can prevent external impurities from entering the ring cavity and contaminating the gear oil, thereby extending the service life of the rotating parts and the gear oil.

2. A screw conveyor, comprising a drive device arranged at the end of a screw shaft, characterized in that: The driving device is the driving device according to claim 1.

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