A mixer spindle extractor

Abstract

This utility model provides a stirrer spindle removal device, belonging to the field of storage tank maintenance technology. It includes a base and a shaft end cover that cooperates with the base. The base is provided with a circular hole for the stirrer spindle to pass through and at least two threaded holes I. The threaded holes I are located on both sides of the circular hole and are respectively fitted with tightening screws. A thrust bearing is installed between one end of the shaft end cover and the base. The thrust bearing is coaxially engaged with the circular hole on the base. The other end of the shaft end cover is provided with a threaded hole II. A handle is fixed on the outer periphery of the shaft end cover. This utility model solves the technical problem of the stirrer spindle being difficult to rotate after being removed in the prior art, avoids oil leakage, and reduces safety hazards.

Description

Technical Field

[0001] This utility model relates to the field of storage tank maintenance technology, and in particular to a stirrer spindle removal device. Background Technology

[0002] Currently, crude oil storage and transportation mainly utilize metal crude oil storage tanks. In order to ensure quality during crude oil transportation, it is necessary to increase the frequency of agitator use.

[0003] With frequent operation of the agitator, the mechanical seal surface inside the agitator will wear down. Furthermore, impurities in the oil itself can enter the agitator, causing varying degrees of damage to the mechanical seal and increasing the risk of leakage, posing a significant safety hazard. Therefore, it is necessary to replace the agitator mechanical seal. The agitator mechanical seal is installed inside the equipment and mates with the agitator main shaft. During replacement, the agitator main shaft needs to be pulled out. After pulling it out 20 cm, rotate the agitator main shaft to lock the auxiliary seal of the agitator inside the storage tank to prevent oil leakage. Chinese utility model patent CN203526899U discloses a shaft puller for replacing the mechanical seal of an agitator, which includes a base and a movable bushing. Elongated positioning elements are symmetrically arranged on both sides of the base, and the positioning elements have external threaded holes. The bushing has a bushing cavity adapted to the outer diameter of the agitator main shaft, and the end of the bushing is connected to a threaded hole at the end of the agitator main shaft by a top bolt. When disassembling the mechanical seal of the agitator, first install the base on the agitator main shaft, then put on the bushing, and connect the bushing and the agitator main shaft with the top bolt. Then rotate the bolt on the outside of the base evenly to drive the base and bushing outward, thereby pushing the agitator main shaft outward to expose the mechanical seal.

[0004] However, in actual operation, in order to prevent oil leakage in the storage tank, after the agitator main shaft is pulled out to a certain extent, it is necessary to rotate the agitator main shaft to a certain angle to lock the agitator main shaft and the agitator auxiliary seal. In the above-mentioned prior art, after the agitator main shaft is pulled out to a certain extent, it is necessary to use other tooling to rotate it. Furthermore, during the rotation of the agitator main shaft, sparks may be generated due to the friction between the bushing and the base, which poses a significant safety hazard. Utility Model Content

[0005] This application provides a stirrer spindle removal device, which solves the technical problem in the prior art that the stirrer spindle is not easy to rotate after being removed, thus avoiding oil leakage and reducing safety hazards.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a stirrer spindle extraction device, comprising a base and a shaft end cover that cooperates with the base. The base is provided with a circular hole for the stirrer spindle to pass through and at least two threaded holes I. The threaded holes I are located on both sides of the circular hole and are respectively fitted with tightening screws. A thrust bearing is installed between one end of the shaft end cover and the base. The thrust bearing is coaxially fitted with the circular hole on the base. The other end of the shaft end cover is provided with a threaded hole II. A handle is fixed on the outer periphery of the shaft end cover.

[0007] When using this device to remove the agitator spindle, first install the base onto the agitator spindle, then put on the shaft end cap. Connect the bolts through bolt hole II on the shaft end cap to the threaded hole at the end of the agitator spindle, thus fixing the shaft sleeve and the agitator spindle relatively. Then, rotate the tightening screw at the external threaded hole I. The force generated by the rotating tightening screw will cause the base and shaft end cap to move outwards together, which in turn will push the agitator spindle outwards. As the agitator spindle moves outwards, the mechanical seal originally located inside the agitator cavity gradually becomes exposed. Once the mechanical seal is exposed, turn the handle. Because threaded hole II and the bolt are threaded together, turning the handle will cause the shaft end cap and the agitator spindle to rotate synchronously, thereby locking the agitator auxiliary seal inside the tank to prevent oil leakage. During this process, the thrust bearing will prevent sliding friction between the shaft end cap and the base, reducing safety hazards.

[0008] As a further improvement to the above solution, the base includes a positioning plate, which is annular in shape. A clamping plate is fixed on each side of the positioning plate, and a threaded hole I is provided through the surface of each clamping plate. The annular positioning plate can be fitted around the outer circumference of the stirrer spindle. When the clamping screw that mates with the threaded hole I rotates, the clamping screw will apply a reaction force to the clamping plate, thereby driving the clamping plate to move outward. Since the clamping plate is fixed to the positioning plate, the positioning plate moves outward synchronously, thereby realizing the removal of the stirrer spindle.

[0009] As a further improvement to the above scheme, the positions of the two threaded holes I are symmetrical about the center of the base length direction; thus, when the device is fixed with the agitator spindle, the agitator spindle can be located at the center of the line connecting the two tightening screws. When the two tightening screws are rotated, the force on the agitator spindle can be kept along its axial direction.

[0010] As a further improvement to the above solution, the shaft end cap includes a tubular body, one end of which is provided with a cover, and a threaded hole II is provided through the center of the cover; wherein the tubular body can be nested on the outer periphery of the end of the stirrer spindle, and the cover can be fixed to the end of the stirrer spindle by screws. Since the threaded hole II is provided at the center of the cover, it can be ensured that the tubular body and the stirrer spindle are coaxially fixed.

[0011] As a further improvement to the above solution, a retaining ring is provided on the outer periphery of the tubular body, extending radially outward. The retaining ring is located at the end of the tubular body away from the end cap, and the outer diameter of the retaining ring is larger than the outer diameter of the circular hole on the base. When the device is in use, one end face of the retaining ring can be in contact with the thrust bearing, thereby ensuring that the base can transmit force to the shaft end cap.

[0012] As a further improvement to the above scheme, the diameter of the circular hole on the base is larger than the outer diameter of the tubular body.

[0013] As a further improvement to the above solution, each top-tightening plate also has a through hole, with the two through holes symmetrical about the center of the base's length. This allows for the installation of the agitator spindle using this device. The specific process is as follows: First, the shaft end cap is fitted onto the agitator spindle. Screws are then passed through the top threaded hole II at the end of the shaft end cap and connected to the threaded hole at the end of the agitator spindle, ensuring a tight fit between the shaft end cap and the agitator spindle. Next, the outer side of the base is fitted onto the shaft end cap. The central hole of the base matches the outer diameter of the shaft end cap, and the retaining ring on the shaft end cap assists in positioning. Then, two bolts are passed through the two through holes on the top-tightening plate to install the base. Rotating these bolts creates a force on the base, causing the base and shaft end cap to move inward, which in turn pushes the agitator spindle inward, completing the installation of the agitator spindle and achieving the installation of the mechanical seal.

[0014] As a further improvement to the above solution, the inner diameter of the thrust bearing is larger than the outer diameter of the shaft end cover and smaller than the outer diameter of the retaining ring. Therefore, during the installation of the agitator main shaft using this device, the thrust bearing can be fitted outside the shaft end cover, so that the thrust bearing is located between the retaining ring and the base, avoiding direct contact between the shaft end cover and the base and reducing friction.

[0015] As can be seen from the above technical solutions, this utility model has at least the following technical effects or advantages:

[0016] 1. Since a handle is fixed on the outer circumference of the shaft end cover, and the other end of the shaft end cover is provided with a threaded hole II that matches the screw hole at the end of the agitator main shaft, after the agitator main shaft is pulled out, turning the handle can drive the shaft end cover to rotate synchronously with the agitator main shaft, thereby locking the agitator auxiliary seal in the tank. This solves the technical problem that the agitator main shaft is not easy to rotate after being pulled out in the prior art, and avoids oil leakage.

[0017] 2. Previously, if the shaft end cap and base were in direct contact, the sliding friction would generate significant resistance, making operation difficult and potentially causing sparks, posing a safety hazard. In this device, a thrust bearing is installed between the shaft end cap and the base. This thrust bearing converts sliding friction into rolling friction, significantly reducing the friction between the shaft end cap and the base during the removal of the agitator shaft. This makes the removal process smoother and reduces safety risks. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is the front view of the present invention;

[0021] Figure 3 This is a top view of the present invention;

[0022] Figure 4 This is the left view of the present invention.

[0023] Explanation of reference numerals in the attached drawings: 1. Base, 101. Positioning plate, 1011. Round hole, 102. Tightening plate, 1021. Threaded hole I, 1022. Through hole, 2. Shaft end cover, 201. Tubular body, 202. Cover body, 2021. Threaded hole II, 203. Retaining ring, 3. Thrust bearing, 4. Handle, 5. Tightening screw. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions 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, and not all embodiments. Based on the embodiments of this patent, other embodiments obtained by those skilled in the art without creative effort are all within the scope of protection of this patent.

[0025] Please see Figures 1 to 4This utility model discloses a stirrer spindle removal device, which includes a base 1 and a shaft end cover 2 that cooperates with the base 1. The base 1 is provided with a circular hole 1011 for the stirrer spindle to pass through and at least two threaded holes I 1021. The threaded holes I 1021 are located on both sides of the circular hole 1011 and are respectively fitted with tightening screws 5. A thrust bearing 3 is installed between one end of the shaft end cover 2 and the base 1. The thrust bearing 3 is coaxially engaged with the circular hole 1011 on the base 1. The other end of the shaft end cover 2 is provided with a threaded hole II 2021. A handle 4 is fixed on the outer periphery of the shaft end cover 2.

[0026] In this embodiment, as Figure 1 As shown, the base 1 has a symmetrical structure. The central circular hole 1011 allows the stirrer spindle to pass through. The two threaded holes I 1021 have the same internal thread pitch, and the tightening screw 5 is threadedly connected to the threaded hole I 1021. The base has an annular groove coaxial with the circular hole 1011, allowing the thrust bearing 3 to be placed within it. The thrust bearing 3 ensures smooth relative rotation between the shaft end cap 2 and the base 1, and its coaxial arrangement with the circular hole 1011 ensures the stability of the entire device during operation. The threaded hole II 2021 at the other end of the shaft end cap 2 connects to the threaded hole at the end of the stirrer spindle. The handle 4 is fixed to the outer circumference of the shaft end cap 2 for easy application of force by the operator.

[0027] When using this device to remove the agitator spindle, first place the base 1 onto the agitator spindle, allowing the spindle to pass through the round hole 1011. Next, put on the shaft end cap 2, and use a screw to pass through the threaded hole II 2021 of the shaft end cap 2, connecting it to the threaded hole at the end of the agitator spindle and tightening it, thus fixing the shaft end cap 2 and the agitator spindle relatively. At this time, rotate the tightening screw 5 at the threaded hole I 1021. The force generated by the rotation of the tightening screw 5 will cause the base 1 and shaft end cap 2 to move outward together, thereby pushing the agitator spindle outward as well. As the agitator spindle moves outward, the mechanical seal originally located inside the agitator cavity gradually becomes exposed. Once the mechanical seal is exposed, rotate the handle 4. Because the threaded hole II 2021 and the screw are threaded and tightened, rotating the handle 4 can drive the shaft end cap 2 to rotate synchronously with the agitator spindle, thereby locking the agitator auxiliary seal inside the tank and preventing oil leakage. During this process, the thrust bearing 3 avoids sliding friction between the shaft end cover 2 and the base 1, reducing safety hazards.

[0028] In the specific structure of the base 1, the base 1 includes a positioning plate 101, which is annular. A top clamping plate 102 is fixed on each side of the positioning plate 101, and a threaded hole I1021 is provided through the plate surface of each top clamping plate 102.

[0029] In this embodiment, as Figure 1 , Figure 3As shown, the positioning plate 101 is annular and can be fitted around the outer circumference of the stirrer main shaft. The clamping plates 102 on both sides of the positioning plate 101 are elongated strips and are fixed integrally with the positioning plate 101. The threaded holes I 1021 on the clamping plates 102 extend through them along their thickness. In this structure, the positioning plate 101 cooperates with the shaft end cover 2. When the clamping screw 5 rotates, it applies a reaction force to the clamping plate 102, causing it to move outward. Since the clamping plate 102 is fixed to the positioning plate 101, the positioning plate 101 moves outward synchronously, thereby enabling the stirrer main shaft to be removed.

[0030] Furthermore, the positions of the two threaded holes I1021 are symmetrical about the center of the length of the base 1. For example... Figure 2 As shown, with the center point along the length of the base 1 as the center of symmetry, two threaded holes I1021 are symmetrically distributed on both sides of the circular hole 1011. Therefore, when this device is fixed to the stirrer spindle, the stirrer spindle is located at the center of the line connecting the two tightening screws 5. When the two tightening screws 5 are rotated, the force on the stirrer spindle is along its axial direction, ensuring the stability of the stirrer spindle during the extraction process, preventing uneven force on the stirrer spindle and thus avoiding deviation, thereby improving the extraction accuracy.

[0031] Regarding the structure of the shaft end cap 2, the shaft end cap 2 includes a tubular body 201, with a cap body 202 at one end of the tubular body 201. A threaded hole II 2021 is disposed through the center of the cap body 202. In this embodiment, the tubular body 201 is a hollow structure, and its inner diameter is adapted to the outer diameter of the end of the stirrer spindle, allowing it to be nested on the outer periphery of the end of the stirrer spindle. The cap body 202 is located at one end of the tubular body 201, and the two are integrated. The threaded hole II 2021 is located at the center of the cap body 202, and is connected to the threaded hole at the end of the stirrer spindle by a screw passing through the threaded hole II 2021, which allows the shaft end cap 2 to be tightly fixed to the stirrer spindle.

[0032] The threaded hole II 2021 is located at the center of the cover 202, which ensures that the tubular body 201 is coaxially fixed with the main shaft of the agitator, ensuring the stability of the shaft end cover 2 when driving the main shaft of the agitator to rotate, avoiding eccentric rotation, and facilitating accurate locking of the agitator auxiliary seal.

[0033] Specifically, the tubular body 201 has a retaining ring 203 extending radially outward from its outer periphery. The retaining ring 203 is located at the end of the tubular body 201 away from the end cap, and the outer diameter of the retaining ring 203 is larger than the outer diameter of the circular hole on the base 1. In this embodiment, as... Figure 1 , Figure 2As shown, the retaining ring 203 is annular and fixed to the outer periphery of the tubular body 201. During the use of this device, one end face of the retaining ring 203 contacts the thrust bearing 3. When the tightening screw 5 pushes the base 1 to move outward, the retaining ring 203 can ensure that the base 1 transmits the force to the shaft end cover 2, so that the shaft end cover 2 can stably drive the agitator main shaft to move outward together.

[0034] Furthermore, the diameter of the circular hole 1011 on the base 1 is larger than the outer diameter of the tubular body 201, and each clamping plate 102 also has a through hole 1022 extending through its surface. The positions of the two through holes 1022 are symmetrical about the center position of the base 1 along its length. In this embodiment, as... Figure 1 , Figure 2 As shown, the through hole 1022 on the top clamping plate 102 extends along its thickness direction. The agitator spindle can be installed through the through hole 1022 on the top clamping plate 102. The specific process is as follows: First, the shaft end cover 2 is fitted onto the agitator spindle. A screw is then passed through the threaded hole II 2021 at the end of the shaft end cover 2 and connected to the threaded hole at the end of the agitator spindle, thus tightly fixing the shaft end cover 2 and the agitator spindle together. Next, the outer side of the base 1 is fitted onto the shaft end cover, with the central circular hole 1011 of the base 1 matching the outer diameter of the shaft end cover 2. Then, two bolts are passed through the two through holes 1022 on the top clamping plate 102 to the base 1. Rotating these bolts causes their ends to exert force on the base 1, driving the base 1 and shaft end cover 2 inwards, thereby pushing the agitator spindle inwards, completing the installation of the agitator spindle and achieving the installation of the mechanical seal. The through hole 1022 allows the device to be used not only for removing the mixer spindle but also for installing it, thus improving the device's practicality.

[0035] Furthermore, the inner diameter of the thrust bearing 3 is larger than the outer diameter of the shaft end cover 2, but smaller than the outer diameter of the retaining ring 203. Therefore, during the installation of the agitator spindle using this device, the thrust bearing 3 can be fitted over the shaft end cover 2, positioning it between the retaining ring 203 and the base 1. This installation method of the thrust bearing 3 avoids direct contact between the shaft end cover 2 and the base 1, reducing friction between them. This ensures smooth rotation of the shaft end cover 2 during the installation and removal of the agitator spindle, and also reduces the safety hazard of sparks generated by friction.

[0036] In the description of this utility model, the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this utility model and do not require that this utility model be constructed or operated in a specific orientation, and therefore should not be construed as limiting this utility model. The terms "connected" and "linked" in this utility model should be interpreted broadly. For example, they can refer to a connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0037] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in its embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novelty disclosed herein.

Claims

1. A stirrer spindle removal device, comprising a base (1) and a shaft end cap (2) cooperating with the base (1), wherein the base (1) is provided with a circular hole (1011) through which the stirrer spindle passes and at least two threaded holes I (1021), the threaded holes I (1021) being located on both sides of the circular hole (1011) and respectively fitted with tightening screws (5), characterized in that, A thrust bearing (3) is installed between one end of the shaft end cover (2) and the base (1). The thrust bearing (3) is coaxially engaged with the round hole (1011) on the base (1). The other end of the shaft end cover (2) is provided with a threaded hole II (2021). A handle (4) is fixed on the outer periphery of the shaft end cover (2).

2. The stirrer spindle removal device according to claim 1, characterized in that, The base (1) includes a positioning plate (101), which is annular. A top plate (102) is fixed on each side of the positioning plate (101), and a threaded hole I (1021) is provided through the plate surface of each top plate (102).

3. The stirrer spindle removal device according to claim 2, characterized in that, The positions of the two threaded holes I (1021) are symmetrical about the center of the base (1) along its length.

4. The stirrer spindle removal device according to claim 2, characterized in that, The shaft end cap (2) includes a tubular body (201), one end of which is provided with a cap (202), and a threaded hole II (2021) is provided through the center of the cap (202).

5. A stirrer spindle removal device according to any one of claims 2 to 4, characterized in that, The outer periphery of the tubular body (201) is provided with a retaining ring (203) extending radially outward. The retaining ring (203) is located at the end of the tubular body (201) away from the end cap. The outer diameter of the retaining ring (203) is larger than the outer diameter of the circular hole (1011) on the base (1).

6. The stirrer spindle removal device according to claim 5, characterized in that, The diameter of the hole (1011) on the base (1) is larger than the outer diameter of the tubular body (201).

7. A stirrer spindle removal device according to claim 6, characterized in that, Each top plate (102) also has a through hole (1022) through its surface, and the positions of the two through holes (1022) are symmetrical about the center position of the base (1) in the length direction.

8. A stirrer spindle removal device according to claim 7, characterized in that, The inner diameter of the thrust bearing (3) is greater than the outer diameter of the shaft end cap (2) and less than the outer diameter of the retaining ring (203).

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