A special device for disassembling and assembling the main pump oil seal

Abstract

The invention discloses a disassembly and assembly device for the main pump oil seal, comprising a nut, the nut is coaxially sleeved with a worm wheel, the worm wheel is coaxially sleeved with a bearing, the worm wheel is meshed with a worm, and the worm is rigidly fixed in the transmission box; the raceway is embedded in the positioning groove of the transmission box; the floating adjustment plate and the steel ball are fixed to the transmission box as a whole through fine-thread screws; the outer cone surface of the upper end of the planetary roller screw is precisely matched with the inner cone hole of the lower end surface of the middle shaft; the lower cone sleeve is connected to the planetary roller screw through a thread; the screw micrometer is fixedly installed on the connecting plate, and the connecting plate is fixed on two sides of the transmission box; the wireless pocket camera is installed in the groove of the floating adjustment plate, the floating adjustment plate is fixedly installed on the oil seal, and the laser displacement sensor is fixed on the floating adjustment plate. The beneficial effects of the invention are: simple operation, strong practicality, and at the same time reducing the work intensity of operators, improving work efficiency, and shortening the maintenance cycle.

Description

Technical Field

[0001] The invention belongs to the field of nuclear power maintenance, and in particular relates to a disassembly and assembly device suitable for a main pump oil seal. Background Art

[0002] The existing nuclear power plant main pump bearing box oil seal assembly has high assembly precision, and the original disassembly and assembly tools have inherent deficiencies:

[0003] 1. The tool itself is positioned by using the jacking screw connecting rod and the spindle protection cone, which cannot provide accurate positioning and alignment for the oil seal;

[0004] 2. The use of jacking screw rotation (positioning foundation is not fixed) makes it easy to cause eccentric force on the coupling during disassembly and assembly;

[0005] 3. The output torque is uncontrollable during disassembly and assembly, and it is easy to use excessive force to judge whether it is stuck or not. Therefore, it is often stuck during the disassembly of the oil seal assembly, causing damage to the inner hole of the coupling, the pump shaft and the motor shaft.

[0006] Therefore, it is necessary to develop a set of special tools with accurate positioning, self-adjusting alignment, adjustable and controllable output pulling force to ensure that no damage is caused to the inner hole of the coupling, the pump shaft, etc., and to smoothly realize the removal of the oil seal assembly. Summary of the invention

[0007] The purpose of the present invention is to provide a main pump oil seal disassembly and assembly device, which has accurate positioning, can self-adjust and center, has adjustable and controllable output pulling force, and can ensure that no damage is caused to the inner hole of the coupling, the pump shaft, etc., so as to smoothly realize the oil seal assembly disassembly.

[0008] The technical solution of the present invention is as follows: a disassembly and assembly device for the main pump oil seal,

[0009] It includes a nut, the nut is coaxially sleeved with the worm wheel, the worm wheel is coaxially sleeved with the bearing, the worm wheel is meshingly connected with the worm, and the worm is axially rigidly fixed in the transmission box;

[0010] A roller track, wherein the roller track is embedded in a positioning groove of a transmission box;

[0011] A floating adjustment plate, wherein the floating adjustment plate and the steel ball are fixed to the transmission box as a whole through fine-thread screws;

[0012] A planetary roller screw, wherein the outer conical surface at the upper end of the planetary roller screw is precisely matched and connected with the inner conical hole at the lower end surface of the central shaft;

[0013] A lower tapered sleeve, wherein the lower tapered sleeve is connected to the planetary roller screw via threads;

[0014] A screw micrometer, the screw micrometer is fixedly mounted on a connecting plate, and the connecting plate is fixed on two sides of the transmission box;

[0015] The wireless pocket camera is installed in the groove of the floating adjustment plate, the floating adjustment plate is fixedly installed on the oil seal, and the laser displacement sensor is installed and fixed on the floating adjustment plate.

[0016] The worm wheel, the nut and the bearing are fixed axially with precision nuts.

[0017] The circumference of the raceway is evenly distributed with lower raceway steel balls.

[0018] The wireless pocket camera transmits the observation image to the visual handheld receiving device in real time by wireless means, so as to observe whether the oil seal is tilted when installed.

[0019] The visual handheld receiving device includes a mobile phone, a tablet computer and a notebook computer.

[0020] The laser displacement sensors are in 4 groups.

[0021] The measuring head of the screw micrometer is placed on the lower end surface of the oil seal body.

[0022] The beneficial effects of the present invention are: simple operation, strong practicability, and at the same time reducing the workload of operators, improving work efficiency, and shortening maintenance cycles. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a main pump oil seal disassembly and assembly device provided by the present invention;

[0024] Figure 2 It is a CC sectional view in the figure.

[0025] In the figure: 1 middle shaft, 2 fine-thread screw, 3 conical gasket, 4 upper spacer of nut, 5 screw spacer, 6 connecting plate, 7 raceway, 8 screw micrometer, 9 nut, 10 lower taper sleeve, 11 worm, 12 worm wheel, 13 bearing, 14 bearing gland, 15 lower floating adjustment plate, 16 floating adjustment plate, 17 planetary roller screw, 18 guide sleeve, 19 wireless pocket camera, 20 transmission box, 21 laser displacement sensor, 22 pump shaft, 23 flat key, 24 oil seal, 25 first steel ball, 26 second steel ball. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] The present invention aims to ensure that the oil seal can be disassembled and assembled smoothly without damaging the inner hole of the coupling, the pump shaft and the motor shaft. The invention adopts a planetary roller screw with a large load-bearing capacity, a nut and a bearing to convert the spiral motion of the nut and the planetary roller screw into linear motion when the screw is stationary, thereby providing an upward push force and a downward pull force when the oil seal assembly is disassembled and assembled.

[0028] The upper shaft center unidirectional positioning can achieve precise positioning and centering. The upper and lower double ball raceways are used to achieve the device's own horizontal displacement compensation and vertical adjustment functions, which can effectively ensure that the oil seal assembly rises and moves down in a straight line without eccentricity.

[0029] The worm gear force amplification transmission and the operation combination of the adjustable torque wrench can provide controllable and uniform power to avoid excessive force during installation or disassembly of the equipment and damage to the mating surfaces of related components.

[0030] like Figure 1 and 2 As shown, a main pump oil seal disassembly and assembly device includes a central shaft 1, a fine-thread screw 2, a conical gasket 3, a spacer on the nut 4, a screw spacer 5, a connecting plate 6, a raceway 7, a screw micrometer 8, a nut 9, a lower taper sleeve 10, a worm 11, a worm wheel 12, a bearing 13, a bearing gland 14, a lower floating adjustment plate 15, a floating adjustment plate 16, a planetary roller screw 17, a guide sleeve 18, a wireless pocket camera 19, a transmission box 20, and a laser displacement sensor 21.

[0031] The nut 9 is coaxially sleeved with the worm wheel 12, the worm wheel 12 is coaxially sleeved with the bearing 13, the worm wheel 12 is axially fixed with the nut 9, the bearing 13, etc. by precision nuts, the worm wheel 12 is meshed and driven with the worm 11, the worm 11 is axially rigidly fixed in the transmission box 20, the lower raceway steel balls are evenly distributed on the raceway 7, the raceway 7 is embedded in the positioning groove of the transmission box; the upper raceway steel balls are evenly distributed on the lower floating adjustment plate 15, the floating adjustment plate 16 and the steel balls are fixed to the transmission box 20 as a whole by fine-pitch screws 2. The outer conical surface at the upper end of the planetary roller screw 17 is precisely matched with the inner conical hole at the lower end of the central shaft 1. The lower cone sleeve 10 is connected to the planetary roller screw 17 by threads. The screw micrometer 8 is fixedly mounted on the connecting plate 6, and the connecting plate 6 is fixed on the two sides of the transmission box 20. The measuring head of the screw micrometer 8 is on the lower end surface of the oil seal body. When adjusting, the movable ruler part of the micrometer 8 is rotated for adjustment. The wireless pocket camera 19 is installed in the groove of the floating adjustment plate 16, and the floating adjustment plate 16 is fixedly mounted on the oil seal. The wireless pocket camera 19 is aligned with the installation position of the flat key. The wireless pocket camera transmits the observation image to a visual handheld receiving device (such as a mobile phone, tablet computer, laptop computer) in real time by wireless means to observe whether the oil seal is tilted when installed. Four groups of laser displacement sensors 21 are installed and fixed on the floating adjustment plate 16.

[0032] The present invention can achieve the following functions:

[0033] 1) Guide positioning: The outer diameter of the guide sleeve is consistent with the inner diameter of the oil seal pump sleeve, and they are precisely matched together. The inner hole and the middle shaft form a whole. The rear end of the middle shaft is designed with a conical surface to accurately position the motor pump shaft pinhole cone hole; at the same time, the matching surface with the motor shaft ensures precise matching accuracy. It can effectively ensure that the positioning plate is coaxial with the motor shaft and provide an accurate positioning reference for the screw installation.

[0034] 2) Screw fixation: The outer cone surface at the upper end of the screw is precisely matched with the inner cone hole at the lower end of the middle shaft; at the same time, the lower cone sleeve at the lower end of the screw is threadedly connected to the screw, and the lower cone sleeve is positioned and fixed with the cone hole in the lower connecting shaft of the main pump shaft. When in use, the screw is rigidly fixed by rotating the lower cone sleeve. After the oil seal is connected to the transmission box, it moves up and down along the screw as a whole. Avoid the coaxiality swing problem caused by the rotation of the screw;

[0035] 3) Oil seal assembly levelness monitoring function: The disassembly device is designed with laser displacement sensors, and 4 groups are evenly arranged in the circumferential direction. The laser displacement sensors are rigidly fixed on the floating adjustment plate, and the lower end surface of the pump shaft is used as the detection reference. By reading and comparing the data on each sensor, the data is transmitted to the visualization interface in real time through the data line. The levelness of the oil seal assembly relative to the motor pump during the disassembly and assembly process is monitored in real time. The spiral micrometer value is slightly adjusted according to the levelness difference of the four groups of detection points, so that the disassembly process of the oil seal device is always controlled within the horizontal accuracy, ensuring that the oil seal assembly is not damaged by overload torque.

[0036] 4) Displacement compensation and vertical adjustment function: The device is designed with spherical double-race precision balls and floating adjustment plates. The upper balls, floating adjustment plates and ball cages are in spherical contact. The micrometer on the side of the transmission box is used to adjust the micro-angle of the floating adjustment plate to achieve vertical self-adjustment. The lower plane ball can move as a whole in any direction on the force surface to effectively achieve angle displacement compensation.

[0037] 5) High efficiency and labor saving: The worm gear speed reduction and force increase mechanism provides rotational power to the planetary nut, which can effectively reduce the input torque and reduce the work intensity of operators. The worm gear device can be used manually with an adjustable torque wrench; it can also be input with an electric screwdriver, which can accurately adjust the input torque to avoid damage to the inner hole of the coupling, the pump shaft, the motor shaft and other key components, and ensure the safety of the main pump oil sealing device.

[0038] 6) Controllable torque: An adjustable torque wrench input interface is designed in front of the worm gear to prevent scratches and damage to the equipment itself due to overload. During the debugging process, the lifting torque required for equipment installation and the downward pulling torque required for disassembly can be pre-set.

[0039] 7) Easy to disassemble and assemble: The device is modularly designed, and only a few modules (guide positioning module, planetary roller screw module, worm gear module, floating adjustment module) need to be simply assembled on site. There is no need for complicated parts assembly, and there is no risk of small parts falling or other foreign objects.

[0040] This disassembly device is a precision metal processing component, which is made of materials suitable for on-site working conditions. The specific assembly steps are as follows:

[0041] 1) Worm gear is connected with nut and bearing

[0042] The nut 9 and the worm wheel 12 are coaxially sleeved together, the worm wheel 12 and the bearing 13 are coaxially sleeved together, and the worm wheel 12, the nut 9, the bearing 13, etc. are axially fixed by precision nuts.

[0043] 2) Worm gear connection

[0044] The worm 11 is axially rigidly fixed in the transmission box 20 , and the worm wheel 12 is meshingly transmission-connected with the worm 11 .

[0045] 3) Floating adjustment plate and steel ball adjustment device

[0046] The circumference of the lower raceway steel balls is evenly distributed on the raceway 7, and the raceway 7 is embedded in the positioning groove of the transmission box; the circumference of the upper raceway steel balls is evenly distributed on the lower floating adjustment plate 15. The floating adjustment plate 16 and the steel balls are fixed to the transmission box 20 as a whole through fine-thread screws 2.

[0047] 4) Planetary roller screw and central axis positioning connection

[0048] The outer conical surface at the upper end of the planetary roller screw 17 is precisely matched with the inner conical hole at the lower end surface of the central shaft 1.

[0049] 5) The lower cone sleeve is connected to the planetary roller screw

[0050] The lower cone sleeve 10 is connected to the planetary roller screw 17 via threads.

[0051] 6) Connect the micrometer screw to the transmission box

[0052] The screw micrometer 8 is fixedly mounted on the connecting plate 6, and the connecting plate 6 is fixed on two sides of the transmission box 20. The measuring head of the screw micrometer 8 is pressed against the lower end surface of the oil seal body. When adjusting, the movable ruler part of the micrometer 8 is rotated for adjustment.

[0053] 7) Connection of wireless pocket camera

[0054] The wireless pocket camera 19 is installed in the groove of the floating adjustment plate 16, the floating adjustment plate 16 is fixedly installed on the oil seal, the wireless pocket camera 19 is aligned with the flat key installation position, and the wireless pocket camera transmits the observation image to a visual handheld receiving device (such as a mobile phone, tablet computer, laptop computer) in real time via wireless means to observe whether the oil seal is tilted during installation.

[0055] 8) Connection of laser displacement sensor

[0056] Four groups of laser displacement sensors 21 are mounted and fixed on the floating adjustment plate 16 .

Claims

1. A disassembly and assembly device for a main pump oil seal, characterized in that: It includes a nut, the nut is coaxially sleeved with the worm wheel, the worm wheel is coaxially sleeved with the bearing, the worm wheel is meshingly connected with the worm, and the worm is axially rigidly fixed in the transmission box; A roller track, wherein the roller track is embedded in a positioning groove of a transmission box; A floating adjustment plate, wherein the floating adjustment plate and the steel ball are fixed to the transmission box as a whole through fine-thread screws; A planetary roller screw, wherein the outer conical surface at the upper end of the planetary roller screw is precisely matched and connected with the inner conical hole at the lower end surface of the central shaft; A lower tapered sleeve, wherein the lower tapered sleeve is connected to the planetary roller screw via threads; A screw micrometer, the screw micrometer is fixedly mounted on a connecting plate, and the connecting plate is fixed on two sides of the transmission box; The wireless pocket camera is installed in the groove of the floating adjustment plate, the floating adjustment plate is fixedly installed on the oil seal, and the laser displacement sensor is installed and fixed on the floating adjustment plate.

2. A main pump oil seal disassembly and assembly device as claimed in claim 1, characterized in that: The worm wheel, the nut and the bearing are fixed axially with precision nuts.

3. A main pump oil seal disassembly and assembly device as claimed in claim 1, characterized in that: The circumference of the raceway is evenly distributed with lower raceway steel balls.

4. A main pump oil seal disassembly and assembly device as claimed in claim 1, characterized in that: The wireless pocket camera transmits the observation image to the visual handheld receiving device in real time by wireless means, so as to observe whether the oil seal is tilted when installed.

5. A main pump oil seal disassembly and assembly device as claimed in claim 4, characterized in that: The visual handheld receiving device includes a mobile phone, a tablet computer and a notebook computer.

6. A main pump oil seal disassembly and assembly device as claimed in claim 1, characterized in that: The laser displacement sensors are in 4 groups.

7. A main pump oil seal disassembly and assembly device as claimed in claim 1, characterized in that: The measuring head of the screw micrometer is placed on the lower end surface of the oil seal body.

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