Screw pump auger blade disassembly and maintenance device

Abstract

This utility model discloses a device for disassembling and repairing screw pump helical blades. It includes a cylinder with a piston rod, a tray with the upper end fixed to the cylinder and the lower end fixed to the chassis via front and rear supports. A push bar at the front end of the piston rod passes through a pulley mounting bracket with movable pulleys at both ends and abuts against the pump shaft. Two steel wire ropes are provided, one wound around the movable pulley and the other around fixed pulleys mounted on both sides of a fixed pulley mounting bracket. One end of each steel wire rope is fixed to both sides of the fixed pulley mounting bracket. When disassembling the helical blades, the piston rod is pulled backward to pull the helical blades out of the screw pump body. When installing the helical blades, the piston rod is pushed forward to push the helical blades into the screw pump body. This device can be applied to the maintenance of screw pumps in oil and gas gathering and transportation stations and storage facilities. It can also be transported to the ground work site of the screw pump by a vehicle used to transport maintenance personnel for maintenance of the helical blades in the screw pump.

Description

Technical Field

[0001] This utility model relates to a repair device for screw pumps, and in particular to a device for disassembling and repairing screw pump helical blades. Background Technology

[0002] A screw pump is a type of liquid pump that uses the rotation of helical blades to make fluid rise axially. It consists of a pump shaft, helical blades, and a casing. Depending on the operation and installation method, screw pumps are generally classified into three types: one is a submersible pump, where the pump body is installed vertically in the liquid; another is a horizontal pump body, where the pump shaft rotation drives the impeller to generate suction, thus pressurizing and transporting the liquid.

[0003] Another type involves placing the pump body at an angle in the liquid, representing another method of operation and installation for submersible pumps. This method relies on the screw pump's main shaft angle being smaller than the angle of the helical blades, with the lower end of the helical blades in contact with the water. When the motor drives the pump shaft to rotate via a speed-changing device, the liquid enters the helical blades of the impeller, rising along the helical flow path and being transported.

[0004] Screw pumps have a simple structure, are easy to manufacture, have a large flow rate, low head loss, high efficiency, and a wide range of applications.

[0005] While screw pumps offer high performance and practicality, they generally suffer from drawbacks such as large size, high assembly precision requirements, and difficult maintenance. These technical limitations complicate routine maintenance. This is especially true for screw pumps used in oil extraction, which pump not only crude oil extracted along with oilfield water but also oil sludge and sand from the formation, which negatively impacts oil processing equipment, particularly screw pumps. The primary impact is the severe wear on the screw pump's helical blades caused by the oil sludge and sand, shortening their lifespan.

[0006] To avoid disrupting production, oilfield production units have implemented regular maintenance procedures for screw pump equipment, with the inspection of the helical blades being a mandatory component. During screw pump maintenance, methods such as pulling, hammering, and axeing are often used to disassemble and reassemble the helical blades. This process is time-consuming, utilizes outdated tools, and involves high labor intensity for maintenance workers. Furthermore, due to the large size of screw pumps, assembly facilities are often unavailable at the work site, necessitating transport to a repair workshop or manufacturer for repairs.

[0007] During the transfer of screw pumps, a self-contained crane is required to assist in the operation. Each overhaul of the screw pump necessitates the cooperation of multiple personnel. This not only results in lengthy repair times but also high costs, negatively impacting the operation of oilfield screw pumps. Furthermore, the crane and labor costs for assisting with screw pump repairs far exceed the actual repair costs, especially considering the safety hazards to both equipment and personnel during the transfer process.

[0008] For the repair and disassembly of screw pumps, the following related patent technology has emerged: Patent application number CN202010992136.0, filed on September 21, 2020, discloses a disassembly device for screw pumps, including a pin shaft disassembly device and a stator / rotor disassembly device. The combined use of the stator / rotor disassembly device and the pin shaft disassembly device enables rapid disassembly and maintenance of the screw pump, saving maintenance time, reducing labor costs, and improving operational safety. It has the advantage of low cost, allowing enterprises to better improve production efficiency and avoid significant economic losses caused by prolonged delays.

[0009] However, the aforementioned device is used for disassembling and assembling the stator and rotor components of a screw pump, and cannot be used for disassembling and assembling the helical blades of a screw pump.

[0010] Patent application number CN202122358851, filed on September 28, 2021, discloses a tool for disassembling and assembling a screw pump. The screw pump includes a helical screw and a bushing sleeved on the outside of the helical screw. It also includes a base plate connected to the screw pump and a cylinder fixedly connected to the base plate. The cylinder is provided with a telescopic output shaft. A ball head nut is connected to the end of the output shaft. A top cover for abutting the ball head nut is connected to the end face of the bushing near the cylinder.

[0011] The above-mentioned utility model mainly solves the problem that the ball head and bushing in the screw pump are difficult to disassemble and assemble, and cannot be used to disassemble and assemble the helical blades of the screw pump.

[0012] Patent application number 202020066084.X, filed on January 13, 2020, discloses a tool for replacing the stator or rotor of a screw pump. The tool includes a guide rail, two sliding supports, multiple locking structures, and a spacing adjustment structure. The guide rail is mounted on the base of the screw pump. The two sliding supports slide along the guide rail and have spaces for the stator or rotor of the screw pump to pass through. The multiple locking structures are respectively mounted on the two sliding supports to lock the stator or rotor passing through the sliding supports. The spacing adjustment structure is fixed between the two parallel sliding supports to adjust and position the spacing between the two sliding supports. Using the screw pump stator or rotor replacement tool provided by this utility model, the number of maintenance personnel can be reduced, maintenance time can be shortened, and the pass rate of parts installation quality can be improved. This achieves the goals of short replacement time and high maintenance quality, improving work efficiency and maintenance quality while reducing manpower and maintenance costs.

[0013] The above-mentioned utility model mainly solves the problem of disassembling and assembling the stator and rotor in a screw pump, but cannot be used to disassemble and assemble the helical blades of a screw pump.

[0014] The technologies described above have all played a positive role in the maintenance and repair of screw pumps, particularly in the repair of certain components. However, a tool specifically designed for disassembling and assembling the externally mounted helical blades on the pump shaft is lacking in screw pump maintenance, as the helical blades are the most vulnerable component in screw pumps used in oilfield production. Developing a tool that can be directly applied to the helical blades of screw pumps would not only save significant maintenance waiting time and reduce labor and transportation costs, but also ensure the safety of maintenance work. Summary of the Invention

[0015] The purpose of this invention is to provide a device for disassembling and repairing screw pump helical blades, which solves the problem of the lack of special disassembly and repair tools for screw pump helical blades, making disassembly and repair difficult. While ensuring the quality of helical blade maintenance, it reduces the number of workers and auxiliary hoisting equipment, shortens the maintenance time of screw pump helical blades, and improves maintenance efficiency.

[0016] The technical solution of this utility model is: a disassembly and maintenance device for the spiral blades of a screw pump, including a cylinder with a piston rod, wherein: the upper end of the tray is fixed to the cylinder and the lower end is fixed to the chassis by a front bracket and a rear bracket respectively; a top bar set at the front end of the piston rod can pass through a movable pulley mounting bracket with movable pulleys at both ends and abut against the pump shaft; two steel wire ropes are provided and are respectively wound around the movable pulley and the fixed pulleys installed on both sides of the fixed pulley mounting bracket; one end of the two steel wire ropes is fixed to both sides of the fixed pulley mounting bracket;

[0017] When disassembling the spiral blade, the push rod abuts against the pump shaft, and the other end of the wire rope is fixed to the ear plate holes on both sides of the connector that connects to the spiral blade, so that the piston rod is pulled back and the spiral blade is pulled out of the screw pump body.

[0018] When installing the spiral blades, the push rod abuts against the pump shaft, and the other end of the wire rope is wound around the assembly pulleys on both sides of the assembly pulley bracket installed outside the screw pump body and then fixed to the ear plate hole, so that the piston rod pushes forward and pushes the spiral blades into the screw pump body.

[0019] Preferably, there are two or more fixed pulleys and movable pulleys.

[0020] Preferably, the chassis has at least four wheels on both sides or at the bottom.

[0021] Preferably, the rear support is a U-shaped frame or a portal frame, and the upper rear support crossbeam of the U-shaped frame or portal frame is arc-shaped or straight. The two support rods on both sides of the rear support can pass through the rear support slide of the tray from top to bottom, and the lower support rod is provided with a rear support safety pin hole. A rear support safety pin with a rear support safety pin handle can be inserted into the rear support safety pin hole. There are three or more rear support safety pin holes, and the rear support safety pin is inserted into the rear support safety pin hole under the tray.

[0022] Preferably, the rear support slide is a vertical channel set in the body of the tray, and the diameter of the rear support slide is smaller than the outer diameter of the support rods on both sides of the rear support; the upper frame of the rear support is higher than the height of the fixed pulley fixing frame.

[0023] Preferably, the front support is a telescopic support, which mainly consists of a front support base with a front support safety pin hole, a front support safety pin, and a telescopic rod with a front support safety pin hole that is smaller than the inner diameter of the front support slide in the front support base. The telescopic rod is welded to the lower end face of the tray and can move up and down along the front support slide in the front support base. There are three or more front support safety pin holes, and the outer end of the front support safety pin is provided with a front support safety pin handle. The front support safety pin can be inserted into the front support safety pin holes in the front support base and the telescopic rod.

[0024] Preferably, the fixed pulley fixing frame is located on the upper end of the tray in front of the rear support and is also a U-shaped frame or a gate-shaped frame; the fixed pulley is installed on the wheel axle of the frame on both sides of the fixed pulley fixing frame.

[0025] Preferably, the connector is a T-shaped cylindrical body with external threads. The small-diameter cylindrical body of the connector with external threads can be connected to the internal thread of the end of the spiral blade. The large-diameter cylindrical body of the connector without external threads is provided with ear plates on both sides, and the ear plate holes are located in the plate body of the ear plates.

[0026] Preferably, the assembly pulley bracket mainly consists of two clamps equipped with axles and assembly pulleys. The two ends of the two clamps are fixed to the rear side of the front flange of the screw pump body by fastening bolts. The inner circle formed by the two clamps is smaller than the outer circle of the screw pump body. The axle fixed in the two clamps is on the same horizontal line as the top rod and the piston rod.

[0027] Preferably, the two steel wire ropes revolve back and forth in an S-shape between the fixed pulley and the movable pulley; the movable pulley mounting bracket has a top bar through hole in the middle, the diameter of which is larger than the outer diameter of the top bar and smaller than the outer diameter of the piston rod.

[0028] The significant advantages of this invention are: it can be applied to the maintenance of screw pumps in oil and gas gathering and transportation stations and storage facilities, and can also be transported to the ground work site of the screw pump by vehicles used to transport maintenance personnel for maintenance of the screw pump's helical blades. The advantages of this device are: 1. This device is equipped with a lifting tray, which allows for convenient adjustment of its working position.

[0029] 2. Using the cylinder in the jack as the power source for this device reduces the labor intensity of maintenance personnel.

[0030] 3. In order to pull out and push in the helical blades in the screw pump body, pulleys and wire ropes are used, and the top bar is used to support the pump shaft, so that the helical blades installed in the screw pump body can be easily pulled out and pushed in.

[0031] 4. This utility model utilizes the working principle that increasing the number of pulleys can multiply the installation length of the wire rope, thereby shortening the working stroke of the piston rod in the cylinder, which effectively reduces the size of this utility model, making the device more compact and easier to transport and handle.

[0032] In summary, this device enables rapid maintenance of various screw pump models, is not limited by the working environment, and has the capability to perform maintenance work on-site, reducing the cumbersome procedures involved in repairing the helical blades. It eliminates the need for crane assistance, reducing the number of personnel required, saving maintenance costs, and eliminating potential safety hazards. Simultaneously, it reduces the maintenance steps for screw pumps, improves the maintenance efficiency of the helical blades, and demonstrates significant practical benefits. Attached Figure Description

[0033] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model; Figure 2This is a schematic diagram illustrating the application state when disassembling a spiral blade using this utility model; Figure 3 This is a schematic diagram of the application state when installing spiral blades using this utility model; Figure 4 yes Figure 2 A partial structural diagram of the connector.

[0034] Figure 5 This is a schematic diagram showing the connection between multi-stage fixed pulleys and movable pulleys and the wire rope.

[0035] In the diagram: 1. Rear support beam; 2. Fixed pulley; 3. Tray; 4. Rear support safety pin handle; 5. Rear support safety pin; 6. Rear support slide; 7. Rear support; 8. Wheel; 9. Front support; 10. Wire rope; 11. Movable pulley; 12. Top bar; 13. Movable pulley mounting bracket; 14. Front support slide; 15. Front support safety pin; 16. Front support safety pin handle; 17. Front support base; 18. Chassis; 19. Fixed pulley fixing bracket; 20. Cylinder; 21. Piston rod; 22. Pump shaft; 23. Connector; 24. Spiral blade; 25. Screw pump body; 26. Screw pump base; 27. Ear plate; 28. Ear plate hole; 29. ​​Piston; 30. Rear support safety pin hole; 31. Front support safety pin hole; 32. Assembly pulley bracket; 33. Assembly pulley; 34. Front flange; 35. Fastening bolt; 36. Pump body support leg. Detailed Implementation

[0036] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of this utility model. The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0038] In the description of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, in the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] See Figure 1 - Figure 5 The screw pump rotor blade disassembly and maintenance device includes a cylinder 20 with a piston rod 21, wherein: the upper end of the tray 3 is fixed to the cylinder 20 and the lower end is fixed to the chassis 18 by the front bracket 9 and the rear bracket 7 respectively; the top bar 12 provided at the front end of the piston rod 21 can pass through the movable pulley mounting bracket 13 with movable pulleys 11 at both ends and abut against the pump shaft 22; two steel wire ropes 10 are provided and are respectively wound around the movable pulley 11 and the fixed pulleys 2 installed on both sides of the fixed pulley fixing bracket 19; one end of the two steel wire ropes 10 is fixed to both sides of the fixed pulley fixing bracket 19; when disassembling the rotor blade... When the screw blade 24 is installed, the top rod 12 abuts against the pump shaft 22, and the other end of the wire rope 10 is fixed on the ear plate holes 28 on both sides of the connector 13 connected to the screw blade 24, so that the piston rod 21 is pulled backward and the screw blade 24 is pulled out from the screw pump body 25. When the screw blade 24 is installed, the top rod 12 abuts against the pump shaft 22, and the other end of the wire rope 10 is wound around the mounting pulleys 33 on both sides of the mounting pulley bracket 32 ​​installed outside the screw pump body 25 and then fixed to the ear plate holes 28, so that the piston rod 21 is pushed forward and the screw blade 24 is pushed into the screw pump body 25.

[0040] The helical blade 24 is connected to the pump shaft 22 via a spline inside the screw pump body 25. This device can pull the helical blade 24 out of or push it into the screw pump body 25 so that it is connected to the pump shaft 22 via a spline.

[0041] In order to disassemble the screw pump's helical blades 24, the cylinder 20 in this utility model is fixed in the upper end face of the tray 3. A top bar 12 is provided at the front end of the piston rod 21, and the top bar 12 can pass through the movable pulley mounting bracket 13 with movable pulleys 11 at both ends and abut against the pump shaft 22. Then, two steel wire ropes 10, one end of which is fixed in the fixed pulley fixing bracket 19 and the other end is fixed in the ear plate holes 28 on both sides of the connector 13, are wound around the movable pulley 11 and the fixed pulley 2.

[0042] When disassembling the spiral blade 24, the piston rod 21 is pulled backward to pull the spiral blade 24 off the pump shaft 22 in the screw pump body 25; when installing the spiral blade, the push rod 12 abuts against the pump shaft 22, and the piston rod 21 is pushed forward to push the spiral blade 24 to the working position of the pump shaft 22 in the screw pump body 25.

[0043] This invention successfully solves the problem of the lack of special disassembly and assembly tools for the screw pump's helical blades 24. This device can be placed directly on the vehicle transporting construction personnel and brought to the ground work site of the screw pump for on-site repair and replacement of the screw pump's helical blades 24.

[0044] If the screw pump body 25 has different models and different external dimensions, screw pump bases 26 of different specifications and sizes can be made, or screw pump bases 26 with adjustable height can be made to support the bottom of the pump body support legs 36 of the screw pump body 25 for use during maintenance, so that the pump shaft 22 in the screw pump body 25 being maintained is concentric with the piston rod 21 in this device.

[0045] This invention effectively solves the problem that the screw pump helical blades 24 cannot be directly disassembled and repaired on the production site. While ensuring the quality of on-site maintenance of the helical blades, it reduces the number of workers required and eliminates the need for cranes as auxiliary lifting equipment. It shortens the maintenance time of the screw pump helical blades, effectively improving maintenance efficiency, and achieving both increased efficiency and good economic benefits.

[0046] Based on the above-described embodiment one, this utility model also has the following embodiments: A preferred embodiment: Two or more fixed pulleys 2 and movable pulleys 11 are respectively provided. At least one fixed pulley 2 is installed on both sides of the fixed pulley fixing bracket 19, and at least one movable pulley 11 is installed on both sides of the movable pulley mounting bracket 13. In the disassembly and maintenance device, two or more fixed pulleys 2 and movable pulleys 11 are provided. See [link / reference] Figure 5 In other words, the fixed pulleys 2 installed on both sides of the fixed pulley fixing bracket 19 and the movable pulleys 11 installed on both sides of the movable pulley mounting bracket 13 can be one, two, or three. Figure 5The fixed pulley bracket 19 and the movable pulley mounting bracket 13 both have two fixed pulleys 2 and two movable pulleys 11 on each side. The number of fixed pulleys 2 and movable pulleys 11 installed in this device is determined by the stroke of the helical blades 24 in the screw pump body 25 of different models. In order to reduce the stroke of the piston 29, the steel wire rope 10 is wound around the corresponding number of movable pulleys 11 and fixed pulleys 2 to pull the helical blades 24. Utilizing the principle that the installation length of the steel wire rope 10 can be multiplied by the number of installed pulleys, the helical blades 24 can move forward a distance greater than the extension distance of the piston rod 21, thus shortening the working stroke of the piston 29 in the cylinder 20. If the stroke of the helical blades 24 in the screw pump being repaired is long, the number of movable pulleys 11 and fixed pulleys 2 and the length of the top lever 12 can be increased according to the working length of the helical blades 24 to complete the required disassembly and installation work.

[0047] In a preferred embodiment, at least four wheels 8 are provided on both sides or at the lower end of the chassis 18, so that the working position can be easily adjusted after the present invention is placed at the work site.

[0048] In a preferred embodiment: the rear support 7 is a U-shaped frame or a portal frame. The rear support beam 1 at the upper end of the U-shaped frame or portal frame is arc-shaped or straight. The two support rods on both sides of the rear support 7 can pass through the rear support slide 6 of the tray 3 from top to bottom, and a rear support safety pin hole 30 is provided in the lower support rod. A rear support safety pin 5 with a rear support safety pin handle 4 can be inserted into the rear support safety pin hole 30. There are three or more rear support safety pin holes 30. The rear support safety pin 5 is inserted into the rear support safety pin hole 30 below the tray 3 to support the tray 3. The rear support safety pin handle 4 is located at the outer end of the rear support safety pin 5, which facilitates the insertion and removal of the rear support safety pin 5 into the rear support safety pin hole 30.

[0049] In a preferred embodiment: the rear support slide 6 is a vertical channel set in the body of the tray 3, and the diameter of the rear support slide 6 is smaller than the outer diameter of the support rods on both sides of the rear support 7; the upper frame of the rear support 7 is higher than the height of the fixed pulley fixing frame 19, and can be used as a handrail of the device, making it more convenient to push and move the device.

[0050] In a preferred embodiment, the front support 9 is a telescopic support, mainly composed of a front support base 17 with a front support safety pin hole 31, a front support safety pin 15, and a telescopic rod smaller than the inner diameter of the front support slide 14 in the front support base 17, also with a front support safety pin hole 31. The telescopic rod is welded to the lower end face of the tray 3 and can move up and down along the front support slide 14 in the front support base 17. There are three or more front support safety pin holes 31, and the outer end of the front support safety pin 15 is provided with a front support safety pin handle 16. The front support safety pin 15 can be inserted into the front support safety pin holes 31 in the front support base 17 and the telescopic rod. This allows both the front support 9 and the rear support 7 to adjust the height of the tray 3 using the front support safety pin 15 and the rear support safety pin 5 respectively, eliminating the need for screw pump bases 26 of different heights. This makes it suitable for use with screw pump bodies 25 of different models and specifications, facilitating operation and further improving work efficiency.

[0051] In a preferred embodiment: the fixed pulley fixing frame 19 is located on the upper end of the tray 3 in front of the rear support 7 and is also a U-shaped frame or a gate-shaped frame; the fixed pulley 2 is installed on the wheel axle of the frame on both sides of the fixed pulley fixing frame 19.

[0052] In a preferred embodiment: the connector 13 is a T-shaped cylindrical body with external threads. The small-diameter cylindrical body of the connector 13 with external threads can be connected to the internal thread of the end of the spiral blade 24. The large-diameter cylindrical body of the connector 13 without external threads is provided with ear plates 27 on both sides, and ear plate holes 28 are provided in the plate body of the ear plates 27. These are used to fix the wire rope 10. The external thread of the connector 13 is connected to the internal thread of the end of the spiral blade 24. With the help of the tension or thrust of the cylinder 20 and the wire rope 10, and under the abutment of the top rod 12 against the pump shaft 22, the spiral blade 24, which is installed in the screw pump body 25 and connected to the pump shaft 22 by a spline, is pulled out of or pushed into the screw pump body 25, so that it is connected to the pump shaft 22 by a spline.

[0053] In a preferred embodiment, the assembly pulley bracket 32 ​​mainly consists of two clamps equipped with axles and assembly pulleys 33. Both ends of the two clamps are fixed to the rear side of the front flange 34 of the screw pump body 25 by fastening bolts 35. The inner circle formed by the two clamps is smaller than the outer circle of the screw pump body 25, making the clamps more secure. The axles fixed in the two clamps are on the same horizontal line as the top rod 12 and the piston rod 21. The two assembly pulleys 33 are mounted on the axles of the two clamps. When the spiral blade 24 needs to be installed, the assembly pulley bracket 32 ​​with assembly pulleys 33 on both sides is fixed to the rear side of the front flange 34 of the screw pump body 25 by fastening bolts 35.

[0054] In a preferred embodiment: the two steel wire ropes 10 revolve back and forth in an S-shape between the fixed pulley 2 and the movable pulley 11; the movable pulley mounting bracket 13 is provided with a top bar through hole in the middle, the diameter of which is larger than the outer diameter of the top bar 12 and smaller than the outer diameter of the piston rod 21.

[0055] The following is a brief description of how to use this utility model: 1. If it is necessary to adjust the height of the tray 3, the front support 9 and the rear support 7 are adjusted manually. Hold the front support safety pin handle 16 on the front support safety pin 15, pull the front support safety pin 15 out of the front support safety pin hole 31, and when the tray 3 is adjusted to the appropriate position, reinsert the front support safety pin 15 into the front support safety pin hole 31; the adjustment method for the rear support 7 is the same as that for the front support 9.

[0056] 2. During the disassembly of the spiral blade 24, the cylinder 20 is manually pressurized. When the piston 29 in the cylinder 20 is pressurized by hydraulic oil, the piston 29 pushes the piston rod 21 forward. The piston rod 21 pushes the push rod 12 to apply pressure to the pump shaft 22. Since the pump shaft 22 is connected and fixed to the motor coupling in the screw pump, and the motor and pump body 25 of the screw pump are mounted on the screw pump base 26, the motor and pump body 25 cannot move at this time. Therefore, the pump shaft 22 cannot move with the piston rod 21. Although the pump shaft 22 cannot move, the piston 29 continues to push the piston rod 21 forward under pressure. At this time, the movable pulley mounting bracket 13 on the piston rod 21 will continuously transmit power to the steel wire rope 10 on the movable pulley 11. The tension of the steel wire rope 10 wound on the movable pulley 11 gradually increases, eventually removing the spiral blade 24 from the screw pump body 25.

[0057] 3. During the installation of the spiral blade 24: One end of the steel wire rope 10, which was fixed to the ear plate hole 28 during the disassembly of the spiral blade 24, is passed around the assembly pulley 33 and then re-fixed to the ear plate hole 28 of the connector 23. At this time, the cylinder 20 is manually pressurized. The movement of the spiral blade 24 will be consistent with the movement direction of the piston rod 21 under the action of the assembly pulley 33. The spiral blade 24 will be pushed by the piston rod 21 until it is completely pushed into the working position in the screw pump body 25.

[0058] The described embodiments are merely typical examples, but the present invention is not limited to these embodiments. Those skilled in the art can make modifications without departing from the spirit and teachings of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the inventive spirit and concept of the present invention should be included within the protection scope of the present invention. Therefore, the protection scope is not limited to the above description.

Claims

1. A device for disassembling and repairing the helical blade of a screw pump, comprising a cylinder provided with a piston rod, characterized in that, The upper end of the tray is fixed to the cylinder, and the lower end is fixed to the chassis by the front and rear brackets respectively. The push bar at the front end of the piston rod can pass through the movable pulley mounting bracket with movable pulleys at both ends and abut against the pump shaft. There are two steel wire ropes, which are wound around the movable pulley and the fixed pulleys installed on both sides of the fixed pulley mounting bracket respectively. One end of the two steel wire ropes is fixed to both sides of the fixed pulley mounting bracket. When disassembling the spiral blade, the push bar abuts against the pump shaft, and the other end of the steel wire rope is fixed to the ear plate holes on both sides of the connector connected to the spiral blade, so that the piston rod is pulled backward and the spiral blade is pulled out of the screw pump body. When installing the spiral blade, the push bar abuts against the pump shaft, and the other end of the steel wire rope is wound around the mounting pulleys on both sides of the mounting pulley bracket installed outside the screw pump body and then fixed to the ear plate holes, so that the piston rod is pushed forward and the spiral blade is pushed into the screw pump body.

2. The device for disassembling and repairing the helical blade of the screw pump according to claim 1, characterized in that, The fixed pulley and the movable pulley are each provided in two or more locations.

3. The device for disassembling and repairing the spiral blade of the screw pump according to claim 1, characterized in that, The chassis is provided with at least four wheels on both sides or at the bottom.

4. The device for disassembling and repairing the spiral blade of the screw pump according to claim 1, characterized in that, The rear support is a U-shaped frame or a portal frame. The upper rear support beam of the U-shaped frame or portal frame is arc-shaped or straight. The two support rods on both sides of the rear support can pass through the rear support slide of the tray from top to bottom, and the lower support rod is provided with a rear support safety pin hole. A rear support safety pin with a rear support safety pin handle can be inserted into the rear support safety pin hole. There are three or more rear support safety pin holes, and the rear support safety pin is inserted into the rear support safety pin hole under the tray.

5. The apparatus for disassembling and repairing the spiral blade of a screw pump according to claim 4, wherein the first and second connecting members are formed in a shape of a ring. The rear support slide is a vertical channel set in the body of the tray, and the diameter of the rear support slide is smaller than the outer diameter of the support rods on both sides of the rear support; the upper frame of the rear support is higher than the height of the fixed pulley fixing frame.

6. The apparatus for disassembling and repairing the spiral blade of a screw pump according to claim 1, wherein The front support is a telescopic support, which mainly consists of a front support base with a front support safety pin hole, a front support safety pin, and a telescopic rod with a front support safety pin hole that is smaller than the inner diameter of the front support slide in the front support base. The telescopic rod is welded to the lower end face of the tray and can move up and down along the front support slide in the front support base. There are three or more front support safety pin holes, and the outer end of the front support safety pin is provided with a front support safety pin handle. The front support safety pin can be inserted into the front support safety pin holes in the front support base and the telescopic rod.

7. The device for disassembling and repairing the spiral blade of the screw pump according to claim 5, wherein the device is characterized in that, The fixed pulley fixing frame is located on the upper end of the tray in front of the rear support and is also a U-shaped frame or a gantry frame; the fixed pulley is installed on the wheel axle of the frame on both sides of the fixed pulley fixing frame.

8. The apparatus for disassembling and repairing the spiral blade of a screw pump according to claim 1, wherein The connector is a T-shaped cylindrical body with external threads. The small-diameter cylindrical body of the connector with external threads can be connected to the internal thread of the end of the spiral blade. The large-diameter cylindrical body of the connector without external threads is provided with ear plates on both sides, and the ear plate holes are located in the plate body of the ear plates.

9. The device for disassembling and repairing the spiral blade of the screw pump according to claim 1, characterized in that, The assembly pulley bracket mainly consists of two clamps equipped with wheel axles and assembly pulleys. The two ends of the two clamps are fixed to the rear side of the front flange of the screw pump body by fastening bolts. The inner circle formed by the two clamps is smaller than the outer circle of the screw pump body. The wheel axle fixed in the two clamps is on the same horizontal line as the top rod and piston rod.

10. The device for disassembling and repairing the spiral blade of the screw pump according to claim 1, characterized in that, Two said steel wire ropes are S-shapedly and back-and-forthly looped between the fixed pulley and the movable pulley; the middle of the movable pulley mounting frame is provided with a top rod through hole, the hole diameter of the top rod through hole is greater than the outer diameter of the top rod and smaller than the outer diameter of the piston rod.

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