A multi-degree-of-freedom rotating shaft speed pickup device

Abstract

The present invention discloses a multi-freedom rotating shaft speed pickup device, which comprises a main shaft; a coaxial sleeve on a connecting shaft is provided with a rotating speed measuring disc; a plurality of telescopic rods are evenly arranged in the circumferential direction on the upper edge of a disk surface on one side of the speed measuring disc; a main shaft is coaxially penetrated and clamped in the middle of a traction disc; the end of the main shaft facing away from the connecting shaft is connected to one end of a ball cage synchronous universal coupling; a spline sleeve is provided on the sliding sleeve at the other end of the ball cage synchronous universal coupling; a speed measuring element is fixed on a mounting frame. Advantages: The present invention can offset the axial movement of the rotating shaft by matching the spline sleeve with the ball cage synchronous universal coupling; the sliding rod slides along the sliding sleeve to offset the vibration of the rotating shaft in the radial plane; thereby, the displacement of the rotating shaft in each degree of freedom direction is offset to avoid transmission to the speed measuring disc, thereby ensuring that the speed measuring disc always keeps stable rotation, avoiding damage to the speed measuring element, ensuring the accuracy and reliability of speed measurement, and thereby avoiding system malfunction.

Description

Technical field:

[0001] The invention relates to the technical field of mechanical equipment, and in particular to a multi-degree-of-freedom rotating shaft speed pickup device. Background technology:

[0002] In mechanical transmission equipment, according to the actual production requirements on site, it is usually necessary to collect the rotation speed of the transmission equipment's shaft to feedback and control the operating status of related equipment on site, so as to match the operation of various devices. In some occasions, during the actual operation of transmission equipment, the shaft usually moves in multiple degrees of freedom, including axial movement, radial runout, and a certain rotation around the end of the shaft. In this process, it is easy to cause damage to the sensor used to collect the rotation speed or cause signal loss due to too large a measurement gap, resulting in failure of rotation speed collection, which seriously affects normal production on site.

[0003] For example, the coal conveying system of the coal mill of the boiler is an important system for the stable supply of fuel in the thermal power plant. The coal produced by the coal mill system is continuously conveyed to the shaft of the coal bucket elevator through the horizontal conveying chain. The lifting chain of the bucket elevator drives the bucket to continuously lift the coal dropped into the shaft to the upper conveying device. In order to prevent the bucket elevator from getting stuck and overloaded, the driven shaft of the bucket elevator is usually designed to be installed on two movable side plates. The movable side plates obtain downward traction through the counterweight, drive the driven shaft to move downward, and tighten the coal lifting chain in the shaft, so as to ensure that the upward lifting force of the lifting chain on the driven shaft and the downward traction formed by the counterweight can be in a dynamic balance. In order to collect the rotation speed of the driven shaft online, a speed measuring disc is fixed at the end of the shaft, and a probe (speed measuring element) bracket is fixed at a position adjacent to the speed measuring disc on the frame of the bucket elevator, and then a probe is fixed on the probe bracket. When the speed measuring disc rotates with the driven shaft, the speed of the shaft is detected in real time by the probe.

[0004] During operation, the driven end shaft of the bucket elevator has multiple degrees of freedom displacement, and the movement in each degree of freedom direction is relatively large. It is common for the speed measuring disc to damage the probe, causing the overall pebble coal system protection to operate and the system to shut down. Similarly, due to the large movement of the shaft, it is easy for the distance between the probe and the speed measuring disc to exceed the detection range of the probe, causing the system speed protection to malfunction. Once the pebble coal system shuts down, the pebble coal of the coal mill can only be forced to be discharged on the ground near the coal mill, polluting the environment, wasting manpower, damaging the ground, and even limiting the output of the coal mill, seriously affecting the stable and reliable operation of the boiler fuel supply system. Summary of the invention:

[0005] The purpose of the present invention is to provide a multi-degree-of-freedom shaft speed pickup device that effectively avoids damage to the probe and avoids signal loss due to excessive measurement gap, thereby ensuring stable and accurate speed detection and further avoiding system malfunction.

[0006] The present invention is implemented by the following technical scheme: a multi-degree-of-freedom rotating shaft speed pickup device, which comprises a fixed body, a traction disk and a main shaft; a connecting shaft is fixed on the mounting frame of the fixed body, and a coaxial sleeve is provided on the connecting shaft with a rotatable speed measuring disk; a plurality of telescopic rods are evenly distributed in the circumferential direction on the upper edge of a disk surface of one side of the speed measuring disk, the telescopic rods are vertically arranged relative to the connecting shaft, the sliding sleeve of the telescopic rod is rotatably connected to the speed measuring disk, the sliding rod of the telescopic rod is rotatably connected to the traction disk, and the traction disk is arranged parallel to the speed measuring disk; the main shaft is coaxially penetrated and clamped in the middle of the traction disk, the end of the main shaft facing away from the connecting shaft is connected to one end of a ball cage synchronous universal coupling, and the sliding sleeve of the other end of the ball cage synchronous universal coupling is provided with a spline sleeve; a speed measuring element is fixed on the mounting frame.

[0007] Furthermore, the speed measuring element is a proximity switch; and a plurality of induction blocks corresponding to the speed measuring element are fixed on the outer edge of the speed measuring disc along the circumferential direction.

[0008] Furthermore, a hollow disk body is coaxially fixed on the connecting shaft between the traction disk and the speed measuring disk, the end of the main shaft is placed in the hollow disk body, and a sliding guide disk is coaxially fixed thereto, and a plurality of oil holes are opened on the sliding guide disk.

[0009] Furthermore, the hollow disk body includes a coaxially arranged fixed guide disk, a washer and a limiting ring plate; the fixed guide disk is coaxially fixed to the end of the connecting shaft by screws, and the washer and the limiting ring plate are sequentially fixed on the disk surface of the fixed guide disk adjacent to the traction disk by screws; the sliding guide disk is placed between the fixed guide disk and the limiting ring plate.

[0010] Furthermore, the telescopic rod comprises the sliding sleeve and the sliding rod slidably plugged into the open end of the sliding sleeve; a damping hole is provided at the closed end of the sliding sleeve.

[0011] Furthermore, a bushing is slidably inserted into the sliding sleeve, the sliding rod is slidably arranged in the bushing, a locking cap screwed to the open end of the sliding sleeve is sleeved on the sliding rod, and the locking cap abuts against the end of the bushing.

[0012] Furthermore, the fixed body includes the mounting frame and a box body with openings at both ends; the mounting frame is fixed in the box body; the two ends of the box body are respectively fixed with a front cover and a rear cover by screws, a center hole is opened on the rear cover, and the main shaft passes through the center hole and is placed in the box body.

[0013] Furthermore, it also includes a box fixing frame and a box connecting frame; the box connecting frame is rotatably connected to the box fixing frame through a bracket shaft, one side of the box connecting frame is connected to the box fixing frame through a locking screw, and the other side of the box connecting frame is connected to the side wall of the box through a screw.

[0014] Furthermore, the speed measuring disc is vertically screwed with limit rods on the disc surface corresponding to both sides of each telescopic rod.

[0015] The advantages of the present invention are as follows: the present invention can offset the axial movement of the rotating shaft by matching the spline sleeve with the ball cage synchronous universal coupling, and the ball cage synchronous universal coupling can offset the angular movement; the slide bar slides along the slide sleeve to offset the vibration of the rotating shaft in the radial plane; thereby, the displacement of the rotating shaft in multiple degrees of freedom directions is offset to avoid transmission to the speed measuring disk, thereby ensuring that the speed measuring disk always keeps stable rotation, avoiding damage to the speed measuring element, ensuring the accuracy and reliability of the speed measurement, and thereby avoiding system malfunction. Description of the drawings:

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 for Figure 1 Top view of the .

[0018] Figure 3 for Figure 1 AA section view.

[0019] Figure 4 for Figure 3 B view.

[0020] Figure 5 This is a schematic diagram of the structure of the present invention after the front end cover is removed.

[0021] Figure 6 It is a structural schematic diagram of a box body with a mounting frame fixed thereto according to the present invention.

[0022] Figure 7 for Figure 6 Left view of .

[0023] Figure 8 for Figure 6 CC cross-sectional view.

[0024] Fig. 9 for Figure 6 DD cross-sectional view.

[0025] Fig.10 It is a schematic structural diagram of the sliding guide plate of the present invention.

[0026] Fig.11 It is a structural schematic diagram of the rear end cover of the present invention.

[0027] Fig.12 It is a schematic diagram of the use state of the present invention.

[0028] The markings of the components in the accompanying drawings are as follows: spline sleeve 1.1, ball cage synchronous universal joint 1.2, rotating shaft 2, fixed body 3, mounting frame 3.1, box body 3.2, front end cover 3.3, rear end cover 3.4, center hole 3.41, box body fixing frame 3.5, box body connecting frame 3.6, bracket rotating shaft 3.7, locking screw 3.8, main shaft 4, traction plate 5, connecting shaft 6, speed measuring plate 7, telescopic rod 8, sliding sleeve 8.1, sliding rod 8.2, damping hole 8.3, bushing 8.4, locking cap 8.5, induction block 9, speed measuring element 10, hollow plate body 11, fixed guide plate 11.1, washer 11.2, limit ring plate 11.3, sliding guide plate 12, oil through hole 12.1, limit rod 13, protective hose 14, connecting column 15, bucket elevator 16. Specific implementation method:

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figures 1 to 12As shown, this embodiment provides a multi-degree-of-freedom rotating shaft speed pickup device, which includes a fixed body 3, a traction disc 5 and a main shaft 4; a connecting shaft 6 is fixed on the mounting frame 3.1 of the fixed body 3, and a rotatable speed measuring disc 7 is coaxially sleeved on the connecting shaft 6, and the disc surface of the speed measuring disc 7 is vertically arranged relative to the connecting shaft 6; a plurality of telescopic rods 8 are evenly arranged along the circumferential direction on the disc surface of one side of the speed measuring disc 7. In this embodiment, three evenly arranged telescopic rods 8 are arranged, and the telescopic rods 8 are vertically arranged relative to the connecting shaft 6. The sliding sleeve 8.1 of the telescopic rod 8 is rotatably connected to the speed measuring disc 7, and the sliding rod 8.2 of the telescopic rod 8 is rotatably connected to the traction disc 5. In this embodiment, the traction disc 5 is a triangular structure, and the three corners of the traction disc 5 are respectively connected to the corresponding sliding rods 8.2; the telescopic rod 8 includes a sliding sleeve 8.1 and a sliding rod 8. 2; a bushing 8.4 is slidably inserted into the sleeve 8.1, and the slide rod 8.2 is slidably inserted into the bushing 8.4. A locking cap 8.5 is sleeved on the slide rod 8.2 and is screwed to the open end of the sleeve 8.1. The locking cap 8.5 abuts against the end of the bushing 8.4, and the locking cap 8.5 presses the bushing 8.4 into the sleeve 8.1. The bushing 8.4 is made of wear-resistant copper material to extend the service life; a damping hole 8.3 is provided at the closed end of the sleeve 8.1, and the size of the damping hole 8.3 needs to be actually tested before the product leaves the factory to obtain an ideal damping effect; during the test, damping screws with different apertures are made, and then the apertures are tested in order from small to large, and a damping screw with a suitable aperture is selected, and the damping screw is tightened at the closed end of the sleeve 8.1, and the hole on the damping screw is the damping hole 8.3.

[0031] The traction plate 5 drives the slide bar 8.2 to rotate. When the slide bar 8.2 extends along the slide sleeve 8.1, a negative pressure is formed in the rodless cavity of the slide sleeve 8.1 due to the existence of the damping hole 8.3. Moreover, the end surface area of ​​the closed end of the slide sleeve 8.1 is larger than the end surface area of ​​the open end. At this time, under the action of atmospheric pressure, the slide sleeve 8.1 is pushed to move in the rotation direction, thereby driving the speed measuring plate 7 to rotate. In this process, air slowly enters from the damping hole 8.3. When the slide bar 8.2 contracts along the slide sleeve 8.1, , the rodless cavity of the sliding sleeve 8.1 is positively pressurized. Under the action of the positive pressure, the sliding sleeve 8.1 continues to be pushed to move along the rotation direction of the traction plate 5, which can continue to drive the speed measuring plate 7 to rotate; at this time, the air in the rodless cavity of the sliding sleeve 8.1 is slowly discharged from the damping hole 8.3, which can effectively damp the sliding rod 8.2, avoid strong impact, and help to improve the service life of the present invention; the end of the sliding rod 8.2 is rotatably connected to the traction plate 5 through the fisheye joint bearing, and the end of the sliding sleeve 8.1 is vertically fixed with a connecting rod. The connecting column 15, the end of the connecting column 15 is rotatably connected to the speed measuring disc 7 through a bearing; the traction disc 5 is arranged parallel to the speed measuring disc 7, and the middle part of the traction disc 5 is coaxially penetrated with the main shaft 4, and the cross section of the main shaft 4 is a regular polygonal structure, and the present embodiment is a regular hexagonal structure. The center of the traction disc 5 is provided with a regular hexagonal hole matching the main shaft 4, and the main shaft 4 can drive the traction disc 5 to rotate synchronously during the rotation process; the end of the main shaft 4 facing away from the connecting shaft 6 is connected to one end of the ball cage synchronous universal coupling 1.2 One end of the spline shaft of the ball cage synchronous universal coupling 1.2 is slidably inserted into one end of the spline sleeve 1.1, and the other end of the spline sleeve 1.1 is coaxially screwed on the rotating shaft 2; the present invention is connected with the rotating shaft 2 through the spline sleeve 1.1, which is convenient for transmitting power; wherein the spline sleeve 1.1 can slide axially along the spline shaft of the ball cage synchronous universal coupling 1.2, thereby offsetting the axial movement of the rotating shaft 2; the ball cage synchronous universal coupling 1.2 has angular compensation capability, which can offset the lateral displacement of the rotating shaft 2.

[0032] During the process of the main shaft 4 being driven to rotate by the rotating shaft 2 through the ball cage synchronous universal coupling 1.2, the speed measuring disc 7 is rotated under the drive of the traction disc 5; when the rotating shaft 2 has radial runout, the corresponding sliding rod 8.2 slides along the sliding sleeve 8.1 to offset the runout of the rotating shaft 2 in the radial plane; a plurality of evenly distributed sensing blocks 9 are fixed along the circumferential direction on the outer edge of the speed measuring disc 7. In this embodiment, six sensing blocks 9 are provided, and the sensing blocks 9 are magnetic metal blocks. The speed measuring disc 7 is made of non-magnetic material. A speed measuring element 10 corresponding to the sensing block 9 is fixed on the mounting frame 3.1 of the fixed body 3. In this embodiment, the speed measuring element 10 is a proximity switch. After removing the front end cover 3.3, the speed measuring element 10 can be easily disassembled and assembled; the speed measuring disc 7 rotates During the process, the speed measuring element 10 is triggered by the sensing block 9, so as to realize the detection of the rotation speed of the rotating shaft 2; during the rotation of the rotating shaft 2, the present invention can offset the axial movement of the rotating shaft 2 by matching the spline sleeve 1.1 with the ball cage synchronous universal coupling 1.2, and the ball cage synchronous universal coupling 1.2 can offset the angular movement, that is, offset the deflection of the rotating shaft 2; the sliding rod 8.2 slides along the sliding sleeve 8.1, which can offset the jumping of the rotating shaft 2 in the radial plane; thereby, the displacement and deflection of the rotating shaft 2 in multiple degrees of freedom directions are offset to avoid transmission to the speed measuring disk 7, thereby ensuring that the speed measuring disk 7 always keeps stable rotation, and at the same time, it can avoid damage to the speed measuring element 10, ensure the accuracy and reliability of speed measurement, and avoid system malfunction.

[0033] A hollow disk body 11 is fixed on the connecting shaft 6 between the traction disk 5 and the speed measuring disk 7. The end of the main shaft 4 is placed in the hollow disk body 11, and a sliding guide disk 12 is coaxially fixed. The sliding guide disk 12 is provided with a plurality of oil holes 12.1. When the main shaft 4 drives the sliding guide disk 12 to run in the hollow disk body 11, the lubricating oil in the hollow disk body 11 is thrown to each part in the gap between the sliding guide disk 12 and the hollow disk body 11 through the oil holes 12.1, so that the lubricating oil is distributed more evenly, and the rotation efficiency of the sliding guide disk 12 in the hollow disk body 11 is ensured under the effective lubrication and cooling effects; the hollow disk body 11 includes a coaxially arranged fixed guide disk 11.1, a washer 11.2 and a limit ring plate 11.3; the fixed guide disk 11.1 is coaxially fixed to the end of the connecting shaft 6 by screws, and the fixed guide disk 11.1 is adjacent to the traction disk A washer 11.2 and a limit ring plate 11.3 are fixed on the disk surface on one side of the 5 by screws in sequence; the sliding guide disk 12 is placed between the fixed guide disk 11.1 and the limit ring plate 11.3; when the rotating shaft 2 moves axially, the spline sleeve 1.1 slides along the spline shaft on the ball cage synchronous universal coupling 1.2, and at the same time, under the action of friction, the ball cage synchronous universal coupling 1.2 will be pushed to drive the sliding guide disk 12 to move, and the fixed guide disk 11.1 and the limit ring plate 11.3 play an effective limiting role on the sliding guide disk 12 to avoid collision between the main shaft 4 and the connecting shaft 6; the speed measuring disk 7 corresponds to the disk surface on both sides of each telescopic rod 8. The limit rod 13 can be vertically screwed to limit the rotation angle of the corresponding telescopic rod 8, effectively preventing the sliding rod 8.2 from sliding out of the sliding sleeve 8.1, and ensuring that the speed measuring disk 7 can rotate with the traction disk 5 without separation.

[0034] The fixed body 3 includes a box fixing frame 3.5, a box connecting frame 3.6, a mounting frame 3.1 and a box 3.2 with openings at both ends; the box fixing frame 3.5 is fixedly connected to the equipment body adjacent to the rotating shaft 2. In this embodiment, the box fixing frame 3.5 is fixed to the outer wall of the bucket elevator 16, the box connecting frame 3.6 is rotatably connected to the box fixing frame 3.5 through the bracket rotating shaft 3.7, and one side of the box connecting frame 3.6 is connected to the box fixing frame 3.5 through a locking screw 3.8. .6 The other side is connected to the side wall of the box body 3.2 by screws; after the locking screws 3.8 are removed, the box body connecting frame 3.6 can rotate around the bracket shaft 3.7, which is convenient for moving the box body 3.2. When repairing, the box body 3.2 does not need to be removed. The box body 3.2 can be repaired by rotating the box body 3.2 around the bracket shaft 3.7 at a suitable angle, which provides great convenience for repair and is conducive to improving work efficiency; the two ends of the box body 3.2 are respectively fixed with a front cover 3.3 and a rear cover 3.4 by screws, and the rear cover A center hole 3.41 is provided on the cover 3.4, and the main shaft 4 passes through the center hole 3.41 and is placed in the box body 3.2. The rear end cover 3.4 is configured as two half-piece cover plates, which is convenient for on-site disassembly and assembly; the present invention is covered by the box body 3.2 to prevent the components covered in the box body 3.2 from being contaminated by foreign matter in the external environment, which is beneficial to reducing the frequency of maintenance and extending the service life of the present invention; when the present invention needs to be repaired, the front end cover 3.3 and the rear end cover 3.4 are opened, the locking screws 3.8 are removed, and the box body 3.2 is rotated around the bracket shaft 3.7 to a suitable position for easy maintenance; in addition, the present invention is covered by the box body 3.2 to prevent the rotating parts from being exposed and posing a threat to the safety of the staff; a threaded hole is provided at the bottom of the box body 3.2, and a protective hose 14 for passing the lead wire of the speed measuring element 10 is installed and connected. The protective hose 14 is arranged at the bottom of the box body 3.2, which can prevent rainwater above the box body 3.2 from entering the box body 3.2 through the protective hose 14.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-degree-of-freedom rotating shaft speed pickup device, characterized in that: It comprises a fixed body, a traction disc and a main shaft; a connecting shaft is fixed on the mounting frame of the fixed body, and a coaxial sleeve is provided on the connecting shaft with a rotatable speed measuring disc; a plurality of telescopic rods are evenly arranged on the disc surface of one side of the speed measuring disc in the circumferential direction, the telescopic rods are arranged vertically relative to the connecting shaft, the sliding sleeve of the telescopic rod is rotatably connected to the speed measuring disc, the sliding rod of the telescopic rod is rotatably connected to the traction disc, and the traction disc is arranged parallel to the speed measuring disc; the main shaft is coaxially penetrated and clamped in the middle of the traction disc, the end of the main shaft facing away from the connecting shaft is connected to one end of a ball cage synchronous universal coupling, and the sliding sleeve of the other end of the ball cage synchronous universal coupling is provided with a spline sleeve; a speed measuring element is fixed on the mounting frame; The other end of the spline sleeve is coaxially threaded on the rotating shaft, and the speed measuring element is a proximity switch; a plurality of induction blocks corresponding to the speed measuring element are fixed circumferentially on the outer edge of the speed measuring disc; a hollow disc body is coaxially fixed on the connecting shaft between the traction disc and the speed measuring disc, the end of the main shaft is placed in the hollow disc body, and a sliding guide disc is coaxially fixed thereto, and a plurality of oil holes are provided on the sliding guide disc.

2. A multi-degree-of-freedom rotating shaft speed pickup device according to claim 1, characterized in that: The hollow disk body includes a coaxially arranged fixed guide disk, a washer and a limiting ring plate; the fixed guide disk is coaxially fixed to the end of the connecting shaft by screws, and the washer and the limiting ring plate are sequentially fixed on the disk surface of the fixed guide disk on one side adjacent to the traction disk by screws; the sliding guide disk is placed between the fixed guide disk and the limiting ring plate.

3. The multi-degree-of-freedom shaft speed pickup device according to claim 1, characterized in that: The telescopic rod comprises the sliding sleeve and the sliding rod slidably plugged into the open end of the sliding sleeve; a damping hole is provided at the closed end of the sliding sleeve.

4. A multi-degree-of-freedom shaft speed pickup device according to claim 3, characterized in that: A bushing is slidably inserted in the sliding sleeve, the sliding rod is slidably arranged in the bushing, a locking cap which is screwed on the opening end of the sliding sleeve is sleeved on the sliding rod, and the locking cap abuts against the end of the bushing.

5. A multi-degree-of-freedom rotating shaft speed pickup device according to any one of claims 1 to 4, characterized in that: The fixed body includes the mounting frame and a box body with openings at both ends; the mounting frame is fixed in the box body; the two ends of the box body are respectively fixed with a front cover and a rear cover by screws, a center hole is opened on the rear cover, and the main shaft passes through the center hole and is placed in the box body.

6. The multi-degree-of-freedom rotating shaft speed pickup device according to claim 5, characterized in that: It also includes a box fixing frame and a box connecting frame; the box connecting frame is rotatably connected to the box fixing frame through a bracket rotating shaft, one side of the box connecting frame is connected to the box fixing frame through a locking screw, and the other side of the box connecting frame is connected to the side wall of the box through a screw.

7. The multi-degree-of-freedom rotating shaft speed pickup device according to claim 5, characterized in that: The speed measuring disc is vertically screwed with limit rods on the disc surface corresponding to both sides of each telescopic rod.

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