Pump shaft oil seal repairing method and device

Abstract

The invention discloses a pump shaft oil seal repairing method and device, and relates to the technical field of pump shaft oil seal repairing. The pump shaft oil seal polishing device comprises a machine box and a pump shaft oil seal body, a polishing assembly is arranged on the surface of the machine box and used for polishing the inner wall of the pump shaft oil seal body so that the inner wall of the pump shaft oil seal body can be rough before being repaired, and an electric clamp is fixedly installed on the top face of the machine box. According to the device, the inner wall of the pump shaft oil seal body is polished through the polishing assembly to be rough, the adhesive force of a repairing material is enhanced, the pump shaft oil seal body is fixed and limited through the electric clamp, the clamping part is attached to the outer ring of the pump shaft oil seal body, and it is avoided that deformation affects precision; the air pump and the pipeline are matched to extract vacuum negative pressure in the repairing cavity, then the repairing material is injected into the repairing cavity through the repairing material injection assembly, after injection is completed, the repairing material in the repairing cavity is pressed through the air pump and the pipeline, and it is ensured that the repairing material is tightly filled without bubbles.

Description

Technical Field

[0001] The present invention relates to the technical field of pump shaft oil seal repair, and specifically relates to a method and device for repairing a pump shaft oil seal. Background Art

[0002] In many industrial production scenarios, pumps are widely used as key fluid transportation equipment. The pump shaft oil seal plays an important role in preventing lubricating oil leakage and blocking external impurities from entering the pump body. However, due to factors such as long-term mechanical operation, medium corrosion, and improper installation, the pump shaft oil seal is prone to problems such as wear, aging, and deformation, resulting in a decline in sealing performance, which in turn leads to a reduction in the efficiency of the pump, frequent failures, and even possible shutdowns of the equipment, causing huge losses to production.

[0003] Currently, for damaged pump shaft oil seals, the common treatment method is to directly replace them with new oil seals. The procurement cost of new oil seals and the labor cost for disassembly and assembly cannot be underestimated. If the pump shaft oil seal can be effectively repaired to restore its sealing performance, it has important practical significance for reducing maintenance costs. However, there is a lack of a method and corresponding device in the existing technology that can efficiently and reliably repair pump shaft oil seals to meet the requirements of rapid repair in industrial production sites.

[0004] Therefore, a method and device for repairing a pump shaft oil seal are proposed. Summary of the Invention

[0005] The purpose of the present invention is: to solve the problems raised in the above background art, the present invention provides a method and device for repairing a pump shaft oil seal.

[0006] The present invention specifically adopts the following technical solutions to achieve the above purpose: A pump shaft oil seal repair device includes a chassis and a pump shaft oil seal body. A grinding component is arranged on the surface of the chassis for grinding the inner wall of the pump shaft oil seal body to make the inner wall of the pump shaft oil seal body rough before repair. An electric fixture is fixedly installed on the top surface of the chassis for fixing the pump shaft oil seal body. A transparent tube is fixedly installed on the top surface of the electric fixture. An electric push rod is fixedly installed on the inner top of the chassis. The telescopic part of the electric push rod penetrates through the chassis and the electric fixture and is fixedly connected with a sealing pressing plate. A driving component is arranged on the top surface of the chassis, and two infrared heating lamps are arranged on the moving part of the driving component. A pipeline is arranged on the top surface of the sealing pressing plate, and the end of the pipeline penetrates through the rear side wall of the chassis and is fixedly connected with an air pump. A repair material injection component is arranged inside the chassis and on the sealing pressing plate for injecting repair material into the inner wall of the pump shaft oil seal body.

[0007] Further, the grinding assembly includes a first motor fixedly installed on the inner wall of one side of the chassis, and the output end of the first motor penetrates through one side wall of the chassis and is fixedly connected with a connecting flange. The end face of the connecting flange is fixedly connected with a grinding wheel through bolts, so as to drive the grinding wheel to rotate by the first motor for rough grinding of the inner wall of the pump shaft oil seal body.

[0008] Further, the electric fixture includes a base fixedly installed on the top surface of the chassis, and a second motor is fixedly installed on the top surface of the chassis. The output end of the second motor is fixedly connected with a first bevel gear. Three through grooves are formed in the base, and three first threaded rods are rotatably inserted and installed on the base. The first threaded rods correspond to the through grooves. The end of the first threaded rod is fixedly connected with a second bevel gear, and the second bevel gear meshes with the first bevel gear. A movable clamping block is sleeved on the surface of the first threaded rod, and the movable clamping block is slidably arranged in the through groove. A guide rod is fixedly installed on the base, and the movable clamping block is slidably arranged along the surface of the guide rod.

[0009] Further, the driving assembly includes a vertical frame fixedly installed on the top surface of the chassis. A third motor is fixedly installed on the top surface of the chassis. The output end of the third motor penetrates through the bottom surface of the vertical frame and is fixedly connected with a second threaded rod. A movable arm is sleeved on the surface of the second threaded rod. A fourth motor is fixedly installed on the top surface of the movable arm. A rotating frame is rotatably inserted at the bottom surface of the movable arm. Synchronous wheels are fixedly installed on the output end of the fourth motor and the surface of the rotating frame, and a synchronous belt is sleeved inside the two synchronous wheels. An infrared heating lamp tube is fixedly installed inside the rotating frame, and a transparent glass is fixedly installed on the rotating frame.

[0010] Further, the repair material injection assembly includes a material box fixedly installed at the inner bottom of the chassis. The output end of the material box is fixedly connected with an injection pump. The output end of the injection pump is fixedly connected with an injection pipe. The end of the injection pipe penetrates through the sealing pressing plate, and a solenoid valve is arranged on the injection pipe.

[0011] Further, a pressure monitoring gauge is arranged on the pipeline, and the air pump adopts a piston pump that can be used for both pumping and inflating.

[0012] A method for repairing a pump shaft oil seal includes the following steps: Step S1: Manually perform rounding grinding treatment on the inner circle of the pump shaft oil seal body by using the grinding assembly, so that the inner surface of the pump shaft oil seal body has a rough structure; Step S2: Sleeve the ground pump shaft oil seal body on the outer surface of the transparent pipe, so that the bottom surface of the pump shaft oil seal body fits with the top surface of the electric fixture, and fix the pump shaft oil seal body by the electric fixture; Step S3: The electric push rod drives the sealing pressing plate to move vertically downward and sleeve it on the outer surface of the transparent tube, so that the sealing pressing plate fits the top surface of the pump shaft oil seal body. A repair cavity is formed by the sealing pressing plate, the electric fixture, the transparent tube and the inner ring of the pump shaft oil seal body; Step S4: The air pump extracts the air in the repair cavity through the pipeline, so that the repair cavity is in a low-pressure state; Step S5: The repair agent of polyurethane composite material is injected into the repair cavity through the repair material injection component; Step S6: The air pump and the pipeline are used to pressurize the repair cavity, and under the action of pressure, it is ensured that the repair agent is filled densely without bubbles; Step S7: The driving component drives the infrared heating lamp tube to move into the transparent tube, and drives the infrared heating lamp tube to rotate inside the transparent tube. The filled polyurethane composite material repair agent is cured by the infrared heating lamp tube.

[0013] Further, in the step S2, when the pump shaft oil seal body is fixed and limited by the electric fixture, the clamping part of the electric fixture only needs to fit the outer ring of the pump shaft oil seal body, so as to avoid deformation of the pump shaft oil seal body and affect the accuracy.

[0014] Further, in the step S5, the repair agent of polyurethane composite material is evenly injected onto the inner ring wall of the oil seal through the repair material injection component, and the injection pressure and speed are adjustable to ensure that the repair agent is fully filled into every fine gap of the inner ring wall.

[0015] Further, when curing the polyurethane composite material repair agent in step S7, it is divided into four stages: preheating, heating up, constant temperature, and cooling down. The preheating temperature is 30 °C, and the preheating time is 10-15 minutes; the heating rate is 3 °C / minute until the curing temperature of 100 °C is reached; the constant temperature curing time is 30-60 minutes; the cooling rate is 2 °C / minute until room temperature.

[0016] The beneficial effects of the present invention are as follows: By using the grinding component to grind the inner wall of the pump shaft oil seal body to make it rough, the adhesion of the repair material is enhanced. The pump shaft oil seal body is fixed and limited by the electric fixture, and the clamping part fits the outer ring of the pump shaft oil seal body to avoid deformation and affect the accuracy; By cooperating with the air pump and the pipeline, the vacuum negative pressure is first extracted from the repair cavity, and then the repair material is injected into the repair cavity through the repair material injection component. After the injection is complete, the repair material in the repair cavity is pressurized through the air pump and the pipeline to ensure that the repair material is tightly filled without bubbles; The infrared heating lamp tube can be driven by the driving component to move into the transparent tube and rotate. When the infrared heating lamp tube cures the repair agent, by controlling the heating temperature and time, it ensures that the repair agent is fully cured. During the preheating stage, the initial temperature of the repair agent is increased. During the temperature rising stage, it is gradually raised to the curing temperature. During the constant temperature stage, it ensures that the chemical reaction inside the repair agent proceeds fully. During the cooling stage, it cools down slowly to avoid the influence of thermal stress on the repair effect. Description of the Drawings

[0017] Figure 1 is a schematic three-dimensional structure diagram of the present invention; Figure 2 is a side view of the present invention; Figure 3 is a partial front view of the present invention; Figure 4 is a side sectional view of the present invention; Figure 5 is the present invention Figure 4 enlarged view of part A; Figure 6 is a partial schematic diagram of the driving component of the present invention; Figure 7 is a schematic diagram of the electric fixture of the present invention; Figure 8 is a bottom view of the electric fixture of the present invention; Reference numerals: 1, chassis; 2, grinding component; 201, first motor; 202, connecting flange; 203, grinding wheel; 3, electric fixture; 301, base; 302, second motor; 303, first bevel gear; 304, through groove; 305, first threaded rod; 306, second bevel gear; 307, movable clamping block; 4, pump shaft oil seal body; 5, transparent tube; 6, electric push rod; 7, sealing pressing plate; 8, driving component; 801, vertical frame; 802, third motor; 803, second threaded rod; 804, movable arm; 805, fourth motor; 806, rotating frame; 807, synchronous pulley; 808, synchronous belt; 9, infrared heating lamp tube; 10, pipeline; 11, air pump; 12, repair material injection component; 1201, material box; 1202, injection pump; 1203, injection tube. Detailed Embodiments

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0020] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0021] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "inner", "outer", "upper", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present invention.

[0022] As Figures 1 to 8 shown, the pump shaft oil seal repair device includes a chassis 1 and a pump shaft oil seal body 4. A grinding assembly 2 is provided on the surface of the chassis 1 for grinding the inner wall of the pump shaft oil seal body 4 to make the inner wall of the pump shaft oil seal body 4 rough before repair. An electric fixture 3 is fixedly installed on the top surface of the chassis 1 for fixing the pump shaft oil seal body 4. A transparent tube 5 is fixedly installed on the top surface of the electric fixture 3. An electric push rod 6 is fixedly installed on the inner top of the chassis 1. The telescopic part of the electric push rod 6 penetrates through the chassis 1 and the electric fixture 3 and is fixedly connected with a sealing pressing plate 7. A driving assembly 8 is provided on the top surface of the chassis 1, and two groups of infrared heating tubes 9 are provided on the movable part of the driving assembly 8. A pipeline 10 is provided on the top surface of the sealing pressing plate 7. The end of the pipeline 10 penetrates through the rear side wall of the chassis 1 and is fixedly connected with an air pump 11. A repair material injection assembly 12 is provided inside the chassis 1 and on the sealing pressing plate 7 for injecting repair materials into the inner wall of the pump shaft oil seal body 4.

[0023] More specifically, the inner diameter of the sealing pressing plate 7 is equal to the diameter of the transparent tube 5. After disassembling, the inner wall of the pump shaft oil seal body 4 is polished by the polishing assembly 2 to make its inner wall rough, so as to increase the adhesion of the subsequent repair material. The polished pump shaft oil seal body 4 is placed on the electric fixture 3, and the electric fixture 3 is used to fix the pump shaft oil seal body 4 to ensure stability during the repair process. The sealing pressing plate 7 is driven by the electric push rod 6 to move downward until it fits the top surface of the pump shaft oil seal body 4, so that the sealing pressing plate 7, the electric fixture 3, the transparent tube 5 and the inner ring of the pump shaft oil seal body 4 form a repair cavity. The air pump 11 and the pipeline 10 are used to evacuate the vacuum negative pressure in the repair cavity first, and then the repair material injection assembly 12 is used to inject the repair material into the repair cavity. After the injection is complete, the air pump 11 and the pipeline 10 are used to press the repair material in the repair cavity to ensure that the repair material is tightly filled without bubbles. The driving assembly 8 is used to drive the infrared heating lamp tube 9 to move into the transparent tube 5 and rotate the infrared heating lamp tube 9, so that the filling material in the repair cavity is cured by the infrared heating lamp tube 9.

[0024] The polishing assembly 2 includes a first motor 201 fixedly installed on the inner wall of one side of the chassis 1, and the output end of the first motor 201 penetrates through one side wall of the chassis 1 and is fixedly connected with a connecting flange 202. The end face of the connecting flange 202 is fixedly connected with a grinding wheel 203 by bolts, so as to drive the grinding wheel 203 to rotate by the first motor 201 for rough grinding of the inner wall of the pump shaft oil seal body 4.

[0025] More specifically, the first motor 201 is used to drive the grinding wheel 203 to rotate, the connecting flange 202 is used to ensure the stable rotation of the grinding wheel 203, and the grinding wheel 203 is used to polish the inner wall of the pump shaft oil seal body 4 to make its inner wall rough, so as to improve the adhesion of the repair material.

[0026] The electric fixture 3 includes a base 301 fixedly installed on the top surface of the chassis 1, and a second motor 302 is fixedly installed on the top surface of the chassis 1. The output end of the second motor 302 is fixedly connected with a first bevel gear 303. Three through grooves 304 are formed on the base 301, and three first threaded rods 305 are rotatably inserted and installed on the base 301. The first threaded rods 305 correspond to the through grooves 304. The end of the first threaded rod 305 is fixedly connected with a second bevel gear 306, and the second bevel gear 306 meshes with the first bevel gear 303. A movable clamping block 307 is sleeved on the surface of the first threaded rod 305, and the movable clamping block 307 is slidably arranged in the through groove 304. A guide rod is fixedly installed on the base 301, and the movable clamping block 307 is slidably arranged along the surface of the guide rod.

[0027] More specifically, the second motor 302 is used to drive the first bevel gear 303 to rotate. Through the meshing of the first bevel gear 303 and the second bevel gear 306, the three groups of first threaded rods 305 are driven to rotate synchronously. By the rotation of the first threaded rods 305, the movable clamping blocks 307 slide along the through grooves 304, thereby realizing the clamping or loosening of the pump shaft oil seal body 4, ensuring the stable fixation of the pump shaft oil seal body 4 during the repair process.

[0028] The driving assembly 8 includes a vertical frame 801 fixedly installed on the top surface of the chassis 1. A third motor 802 is fixedly installed on the top surface of the chassis 1. The output end of the third motor 802 penetrates through the bottom surface of the vertical frame 801 and is fixedly connected to a second threaded rod 803. A movable arm 804 is sleeved on the surface of the second threaded rod 803. A fourth motor 805 is fixedly installed on the top surface of the movable arm 804. A rotating frame 806 is rotatably inserted into the bottom surface of the movable arm 804. Synchronous wheels 807 are fixedly installed on the output end of the fourth motor 805 and the surface of the rotating frame 806. And a synchronous belt 808 is sleeved inside the two synchronous wheels 807. The infrared heating lamp tube 9 is fixedly installed inside the rotating frame 806, and a transparent glass is fixedly installed on the rotating frame 806 for protecting the infrared heating lamp tube 9 inside it.

[0029] More specifically, the third motor 802 is used to drive the second threaded rod 803 to rotate, so that the movable arm 804 moves up and down, thereby driving the rotating frame 806 and the infrared heating lamp tube 9 inside it to move into the transparent tube 5. The fourth motor 805 is used to drive the synchronous wheel 807 to rotate. Through the transmission of the synchronous belt 808, the rotating frame 806 drives the infrared heating lamp tube 9 to rotate, realizing the uniform curing treatment of the repair material.

[0030] The repair material injection assembly 12 includes a material box 1201 fixedly installed at the inner bottom of the chassis 1. The output end of the material box 1201 is fixedly connected to an injection pump 1202. The output end of the injection pump 1202 is fixedly connected to an injection pipe 1203. The end of the injection pipe 1203 penetrates through the sealing pressing plate 7, and a solenoid valve is arranged on the injection pipe 1203.

[0031] More specifically, the repair material is stored in the material box 1201. The injection pump 1202 injects the repair material into the inner wall of the pump shaft oil seal body 4 through the injection pipe 1203. The solenoid valve controls the on-off of the injection pipe 1203 to ensure the precise injection of the repair material.

[0032] A pressure monitoring gauge is arranged on the pipeline 10, and the air pump 11 adopts a piston pump that can be used for both pumping and inflating.

[0033] More specifically, the pressure in the repair cavity can be monitored in real time through the pressure detection gauge.

[0034] The pump shaft oil seal repair method includes the following steps: Step S1: Manually perform rounding and grinding treatment on the inner ring of the pump shaft oil seal body 4 using the grinding component 2 to make the inner surface of the pump shaft oil seal body 4 have a rough structure; Step S2: Put the ground pump shaft oil seal body 4 on the outer surface of the transparent tube 5, make the bottom surface of the pump shaft oil seal body 4 fit with the top surface of the electric fixture 3, and fix the pump shaft oil seal body 4 by the electric fixture 3; Step S3: Drive the sealing pressure plate 7 to move vertically downward and sleeve it on the outer surface of the transparent tube 5 through the contraction movement of the electric push rod 6, make the sealing pressure plate 7 fit with the top surface of the pump shaft oil seal body 4, and form a repair cavity through the sealing pressure plate 7, the electric fixture 3, the transparent tube 5 and the inner ring of the pump shaft oil seal body 4; Step S4: The air pump 11 extracts the air in the repair cavity through the pipeline 10 to make the repair cavity in a low-pressure state; Step S5: Inject the repair agent of polyurethane composite material into the repair cavity through the repair material injection component 12; Step S6: Pressurize the repair cavity through the air pump 11 and the pipeline 10, and ensure that the repair agent is filled densely without bubbles under the pressure; Step S7: Drive the infrared heating lamp tube 9 to move into the transparent tube 5 through the driving component 8, and drive the infrared heating lamp tube 9 to rotate in the transparent tube 5, and cure the filled polyurethane composite material repair agent with the infrared heating lamp tube 9.

[0035] In step S2, when the pump shaft oil seal body 4 is fixed and limited by the electric fixture 3, the clamping part of the electric fixture 3 only needs to fit with the outer ring of the pump shaft oil seal body 4 to avoid deformation of the pump shaft oil seal body 4 and affecting the accuracy.

[0036] In step S5, the repair agent of polyurethane composite material is evenly injected onto the inner ring wall of the oil seal through the repair material injection component 12, and the injection pressure and speed are adjustable to ensure that the repair agent is fully filled into every fine gap of the inner ring wall.

[0037] When curing the polyurethane composite material repair agent in step S7, it is divided into four stages: preheating, heating up, constant temperature, and cooling down. The preheating temperature is 30 °C, and the preheating time is 10 - 15 minutes; the heating rate is 3 °C / minute until the curing temperature of 100 °C is reached; the constant temperature curing time is 30 - 60 minutes; the cooling rate is 2 °C / minute until room temperature.

[0038] More specifically, the infrared heating lamp tube 9 cures the repair agent. By controlling the heating temperature and time, it ensures that the repair agent is fully cured. The preheating stage raises the initial temperature of the repair agent, the heating-up stage gradually rises to the curing temperature, the constant-temperature stage ensures that the internal chemical reaction of the repair agent is fully carried out, and the cooling-down stage cools down slowly to avoid the influence of thermal stress on the repair effect.

[0039] In summary: The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. Pump shaft oil seal repair device, characterized in that It includes a chassis (1) and a pump shaft oil seal body (4). A grinding assembly (2) is provided on the surface of the chassis (1) for grinding the inner wall of the pump shaft oil seal body (4) to make the inner wall of the pump shaft oil seal body (4) rough before repair. An electric clamp (3) is fixedly installed on the top surface of the chassis (1) for fixing the pump shaft oil seal body (4). A transparent tube (5) is fixedly installed on the top surface of the electric clamp (3). An electric push rod (6) is fixedly installed at the inner top of the chassis (1). The telescopic part of the electric push rod (6) penetrates through the chassis (1) and the electric clamp (3) and is fixedly connected with a sealing pressing plate (7). A driving assembly (8) is provided on the top surface of the chassis (1), and two groups of infrared heating tubes (9) are provided on the moving part of the driving assembly (8). A pipeline (10) is provided on the top surface of the sealing pressing plate (7), and the end of the pipeline (10) penetrates through the rear side wall of the chassis (1) and is fixedly connected with an air pump (11). A repair material injection assembly (12) is provided inside the chassis (1) and on the sealing pressing plate (7) for injecting repair material into the inner wall of the pump shaft oil seal body (4).

2. The pump shaft oil seal repair device according to claim 1, characterized in that, The grinding assembly (2) includes a first motor (201) fixedly installed on one inner wall of the chassis (1), and the output end of the first motor (201) penetrates through one side wall of the chassis (1) and is fixedly connected with a connecting flange (202). A grinding wheel (203) is fixedly connected to the end face of the connecting flange (202) through bolts, so as to drive the grinding wheel (203) to rotate by the first motor (201) for rough grinding of the inner wall of the pump shaft oil seal body (4).

3. The pump shaft oil seal repair device according to claim 1, characterized in that, The electric clamp (3) includes a base (301) fixedly installed on the top surface of the chassis (1), and a second motor (302) is fixedly installed on the top surface of the chassis (1). The output end of the second motor (302) is fixedly connected with a first bevel gear (303). Three through grooves (304) are formed in the base (301), and three first threaded rods (305) are rotatably inserted and installed on the base (301). The first threaded rods (305) correspond to the through grooves (304). A second bevel gear (306) is fixedly connected to the end of the first threaded rod (305), and the second bevel gear (306) meshes with the first bevel gear (303). A movable clamping block (307) is threadedly sleeved on the surface of the first threaded rod (305), and the movable clamping block (307) is slidably arranged in the through groove (304). A guide rod is fixedly installed on the base (301), and the movable clamping block (307) is slidably arranged along the surface of the guide rod.

4. The pump shaft oil seal repair device according to claim 1, wherein, The driving assembly (8) comprises a vertical frame (801) fixedly mounted on the top surface of the chassis (1); a third motor (802) is fixedly mounted on the top surface of the chassis (1); an output end of the third motor (802) passes through the bottom surface of the vertical frame (801) and is fixedly connected to a second threaded rod (803); a surface thread sleeve of the second threaded rod (803) is provided with a movable arm (804); a fourth motor (805) is fixedly mounted on the top surface of the movable arm (804); a rotating frame (806) is rotatably plugged into the bottom surface of the movable arm (804); a synchronous wheel (807) is fixedly mounted on the output end of the fourth motor (805) and the surface of the rotating frame (806); and a synchronous belt (808) is provided inside the two sets of synchronous wheels (807); an infrared heating lamp (9) is fixedly mounted inside the rotating frame (806), and a transparent glass is fixedly mounted on the rotating frame (806).

5. The pump shaft oil seal repair device according to claim 1, characterized in that The repair material injection assembly (12) comprises a material box (1201) fixedly mounted on the inner bottom of the chassis (1); the output end of the material box (1201) is fixedly connected to an injection pump (1202); the output end of the injection pump (1202) is fixedly connected to an injection tube (1203); the end of the injection tube (1203) passes through the sealing pressure plate (7); and a solenoid valve is provided on the injection tube (1203).

6. The pump shaft oil seal repair device according to claim 1, characterized in that An air pressure monitoring meter is provided on the pipeline (10), wherein the air pump (11) adopts a dual-purpose piston pump for pumping air.

7. Method for repairing pump shaft oil seal, characterized in that, The following steps are involved: Step S1: using the grinding assembly (2) to manually grind the inner ring of the pump shaft oil seal body (4) along the entire circle, so that the inner surface of the pump shaft oil seal body (4) has a rough structure; Step S2: The polished pump shaft oil seal body (4) is placed on the outer surface of the transparent tube (5) so that the bottom surface of the pump shaft oil seal body (4) is in contact with the top surface of the electric clamp (3), and the pump shaft oil seal body (4) is fixed by the electric clamp (3); Step S3: The electric push rod (6) contracts to drive the sealing pressure plate (7) to move vertically downward to the outer surface of the transparent tube (5), so that the sealing pressure plate (7) fits the top surface of the pump shaft oil seal body (4), and a repair cavity is formed by the sealing pressure plate (7), the electric clamp (3), the transparent tube (5) and the inner ring of the pump shaft oil seal body (4); Step S4: the air pump (11) extracts air from the repair cavity through the pipeline (10), so that the repair cavity is in a low-pressure state; Step S5: injecting a polyurethane composite material repair agent into the repair cavity via the repair material injection component (12); Step S6: pressurizing the repair cavity via the air pump (11) and the pipeline (10), and ensuring that the repair agent is filled tightly and without bubbles under the action of pressure; Step S7: The driving assembly (8) drives the infrared heating lamp (9) to move to the interior of the transparent tube (5), and drives the infrared heating lamp (9) to rotate in the transparent tube (5), and uses the infrared heating lamp (9) to perform a curing treatment on the filled polyurethane composite material repair agent.

8. The pump shaft oil seal repair method according to claim 7, characterized in that, In the step S2, when the electric fixture (3) fixes and positions the pump shaft oil seal body (4), the clamping part of the electric fixture (3) only needs to be in contact with the outer ring of the pump shaft oil seal body (4), so as to avoid deformation of the pump shaft oil seal body (4) and affect the accuracy.

9. The pump shaft oil seal repair method according to claim 7, characterized in that, In the step S5, the repair agent of the polyurethane-based composite material is evenly injected onto the inner ring wall of the oil seal through the repair material injection assembly (12), and the injection pressure and speed are adjustable to ensure that the repair agent fully fills every fine gap of the inner ring wall.

10. The pump shaft oil seal repair method according to claim 7, characterized in that, When curing the polyurethane-based composite material repair agent in the step S7, it is divided into four stages: preheating, heating up, constant temperature, and cooling down. The preheating temperature is 30 °C, and the preheating time is 10 - 15 minutes; the heating rate is 3 °C per minute until the curing temperature of 100 °C is reached; the constant temperature curing time is 30 - 60 minutes; the cooling rate is 2 °C per minute until the room temperature is reached.

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