Lock shaft device for ship fire pump

Abstract

The invention relates to a device for a ship fire pump, and belongs to the technical field of fire pump lock shafts. The shaft locking device for the ship fire pump comprises a positioning plug pin, the vertical section of the positioning plug pin is in a T shape, and a reinforcing connecting mechanism is installed in the positioning plug pin; when the positioning plug pin is inserted in place, the rubber spring can actively insert the inserting column into the horizontal inserting groove, the connecting strength of the positioning plug pin and the coupler can be preliminarily improved, in the rotating process of the coupler, the balancing weight automatically pushes the inserting column into the horizontal inserting groove through rotating centrifugal force, and the rotating speed of the coupler is higher. And the depth and the insertion strength of the insertion column inserted into the horizontal insertion groove are increased accordingly, so that the positioning plug pin is stably arranged in the rectangular hole, the probability that the positioning plug pin loosens and even falls off is reduced, and the problems that an existing lock shaft device for the ship fire pump is difficult to use stably and has the hidden danger of loosening and even falling off are solved.

Description

Technical Field

[0001] The invention relates to the technical field of fire pump shaft locking, and in particular to a shaft locking device for a ship fire pump. Background Art

[0002] The main function of a ship fire pump is to push seawater or water from a ship's water tank into the fire-fighting equipment and extinguish the fire by spraying water mist. The structure of a ship fire pump includes a motor, a coupling, a pump body, an impeller, and other structures. The coupling is mainly used to connect the impeller and the motor. In the coupling, the purpose of the shaft lock is to ensure the stability and reliability of the shaft and prevent equipment failure or damage due to the movement or rotation of the shaft. At present, the locking pin is a more common shaft locking device in the coupling.

[0003] A Chinese patent discloses a water pump coupling (authorization announcement number CN211117199U), in which a matching iron pin is inserted into a latch slot, the upper sleeve of the coupling is sleeved on the output end of the pump motor, a matching lower sleeve is taken out, and the lower chuck and the upper chuck are connected by a mortise and tenon structure, and finally a locking pin is nailed into a square hole on the side of the lower chuck.

[0004] Since the above device uses a nailing method to knock the locking pin into the pin slot, the locking pin is locked in the pin slot by friction. Although the locking slot is provided with an anti-slip groove inside, as the use time increases, the locking pin will continue to rub the anti-slip groove, causing the friction between the locking pin and the pin slot to gradually decrease, which will increase the probability of the locking pin falling off. The above device cannot ensure that the locking pin is stably installed, and there is a risk of the locking pin loosening or even falling off. Summary of the invention

[0005] Based on this, it is necessary to provide a shaft locking device for ship fire water pumps to address the problems that the existing shaft locking devices for ship fire water pumps are difficult to use stably and have the risk of loosening or even falling off.

[0006] A shaft locking device for a ship fire water pump comprises a positioning pin, the vertical cross-section of the positioning pin is T-shaped, and a reinforcing connection mechanism is installed inside the positioning pin.

[0007] Furthermore, an installation cavity is provided inside the positioning pin, and a horizontal sliding cavity connected to the installation cavity is provided on the surface of the positioning pin. The reinforced connection mechanism includes a counterweight block, a plug column and a rubber spring. The counterweight block is slidably connected to the inside of the installation cavity, and the plug column is slidably connected to the inside of the horizontal sliding cavity. One end of the plug column extends to the outside of the horizontal sliding cavity, and the other end of the plug column is provided with a slope toward the counterweight block. An installation opening is provided on the surface of the plug column, and the rubber spring is embedded and installed in the inside of the installation opening, and both ends of the rubber spring are fixedly connected to the horizontal sliding cavity.

[0008] In one of the embodiments, when the positioning pin is inserted into place, the rubber spring can actively insert the column into the horizontal slot, which can initially increase the connection strength between the positioning pin and the coupling. During the rotation of the coupling, the counterweight block uses the rotational centrifugal force to push the column deeper into the horizontal slot, and as the speed of the coupling increases, the depth and insertion strength of the column into the horizontal slot also increase, so that the positioning pin is stably set inside the rectangular hole, thereby reducing the probability of the positioning pin loosening or even falling off, thereby solving the problem that the existing shaft locking device for ship fire water pumps is difficult to use stably and has the risk of loosening or even falling off.

[0009] Furthermore, a T-shaped cavity is opened at the top of the positioning pin, and the reinforced connection mechanism also includes a warning component, which includes a ceramic rod and a mounting block, the ceramic rod is fixedly connected to the inner bottom wall of the T-shaped cavity, the mounting block is fixedly connected to the top of the ceramic rod, and the mounting block is arranged inside the T-shaped cavity, and an air guide cavity is opened at one end of the mounting block, and the horizontal cross-section of the air guide cavity is in the shape of an hourglass.

[0010] In one of the embodiments, when the positioning pin is deformed due to external force, the brittle ceramic rod is easily broken, and under the action of the centrifugal force of the coupling rotation, the mounting block is thrown out of the T-shaped cavity and rotates with the coupling. During the rotation of the mounting block, the airflow is guided into it by the air guide cavity at high speed. Since the horizontal cross-section of the air guide cavity is in the shape of an hourglass, the contact area between the airflow and the inner wall of the air guide cavity gradually decreases. At this time, the collision frequency of the airflow and the air guide cavity gradually increases, and the noise generated by the airflow colliding with the air guide cavity will also gradually increase. This can serve the purpose of alerting the surrounding staff so that they can come to check and deal with it in time, so as to reduce the probability of damage to the fire pump or safety hazards caused by excessive deformation or breakage of the positioning pin.

[0011] Furthermore, the horizontal cross-sectional shapes of the installation cavity and the counterweight block are both matching circular shapes, and the top of the counterweight block is arranged below the slope.

[0012] In one embodiment, this can limit the range of movement of the counterweight to ensure that the counterweight can properly push the plunger outward.

[0013] Furthermore, the corners of the counterweight block facing the slope are rounded, and the rounded corners of the counterweight block are always arranged below the highest point of the slope.

[0014] In one embodiment, this can reduce the contact friction between the counterweight and the ramp, allowing the counterweight to push the plunger outward more easily.

[0015] Furthermore, the vertical cross-section of one end of the plug column is in the shape of an arc, and the center point of the arc cross-section of the plug column is set inside the horizontal sliding cavity.

[0016] In one of the embodiments, without the need to actively adjust the position of the pin, this can reduce the difficulty of connecting or separating the positioning pin from the rectangular hole in a non-rotating state, making the loading and unloading operations of the staff easier.

[0017] Furthermore, the corners of the installation opening parallel to the installation cavity are rounded.

[0018] In one embodiment, this can reserve sufficient expansion space for the rubber spring to prevent the rubber spring from being over-squeezed in the gap between the plug post and the horizontal sliding cavity, causing the plug post to be stuck in place by the rubber spring and the plug post being unable to move normally.

[0019] Furthermore, the number of the horizontal sliding cavity, the plug column and the rubber spring is two, and the two horizontal sliding cavities, the two plug columns and the two rubber springs are symmetrically distributed on both sides of the axis of the T-shaped cavity.

[0020] In one embodiment, this can improve the locking effect of the positioning latch to improve the stability of the positioning latch operation.

[0021] Furthermore, the number of the air guide cavities is not less than two, and the air guide cavities are evenly distributed at one end of the mounting block.

[0022] In one embodiment, this can increase the frequency and loudness of the noise generated by the airflow, thereby improving the warning effect to surrounding personnel.

[0023] Furthermore, the axis lines of the air guide cavity and the plug post are parallel.

[0024] In one embodiment, the opening of the air guide cavity can be arranged to face the air surrounding the axis of the coupling to ensure that the air flow can normally enter and exit the air guide cavity.

[0025] Furthermore, a guide cavity connected to the T-shaped cavity is provided inside the positioning pin, and a guide block fixedly connected to the ceramic rod is slidably connected inside the guide cavity, and the horizontal cross-sectional dimensions of the guide cavity and the guide block are both larger than the horizontal cross-sectional dimensions of the connection between the T-shaped cavity and the guide cavity.

[0026] In one embodiment, this can limit the distance that the mounting block is removed from the T-shaped cavity, so that the air guide cavity can generate noise stably in coordination with the airflow.

[0027] The above-mentioned shaft locking device for ship fire water pump, when the positioning pin is plugged into place, the rubber spring can actively insert the plug column into the horizontal slot, which can initially increase the connection strength between the positioning pin and the coupling. During the rotation of the coupling, the counterweight block uses the rotating centrifugal force to push the plug column deeply into the horizontal slot, and as the speed of the coupling increases, the depth and insertion strength of the plug column into the horizontal slot also increase, so that the positioning pin is stably set inside the rectangular hole, thereby reducing the probability of the positioning pin loosening or even falling off, thereby solving the problem that the existing shaft locking device for ship fire water pump is difficult to use stably and has the risk of loosening or even falling off;

[0028] When the positioning pin is deformed due to external force, the brittle ceramic rod is easily broken. Under the action of the centrifugal force of the coupling, the mounting block is thrown out of the T-shaped cavity and rotates with the coupling. During the rotation of the mounting block, the airflow is guided into it by the air guide cavity at high speed. Since the horizontal cross-section of the air guide cavity is in the shape of an hourglass, the contact area between the airflow and the inner wall of the air guide cavity gradually decreases. The collision frequency of the airflow and the air guide cavity gradually increases, and the noise generated by the airflow colliding with the air guide cavity will also gradually increase. This can serve to warn the surrounding staff so that they can come to check and deal with it in time, so as to reduce the probability of damage to the fire pump or safety hazards caused by excessive deformation or breakage of the positioning pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a structural schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the connection between the overall structure of the present invention and the coupling;

[0032] Figure 3It is a vertical cross-sectional schematic diagram of the overall structure and coupling of the present invention;

[0033] Figure 4 for Figure 3 A magnified view of middle;

[0034] Figure 5 It is a horizontal cross-sectional schematic diagram of the overall structure of the present invention;

[0035] Figure 6 It is a partially exploded schematic diagram of the strengthening connection mechanism of the present invention;

[0036] Figure 7 It is a schematic diagram of the explosion of the warning component of the present invention.

[0037] Reference numerals:

[0038] 100. Positioning pin; 110. Mounting cavity; 120. Horizontal sliding cavity; 130. T-shaped cavity; 140. Guide cavity; 200. Strengthening connection mechanism; 210. Counterweight block; 220. Insert column; 221. Slope; 222. Mounting port; 230. Rubber spring; 240. Warning component; 241. Ceramic rod; 242. Mounting block; 2421. Air guide cavity; 243. Guide block. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of the present invention are for illustrative purposes only and do not represent the only implementation method.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] Unless otherwise defined, all technical and scientific terms used in the specification of the present invention have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in the specification of the present invention includes any and all combinations of one or more related listed items.

[0044] Combine the following Figure 1 - Figure 7 The invention describes a shaft locking device for a ship fire-fighting water pump.

[0045] In one embodiment, a shaft locking device for a ship fire pump includes a positioning pin 100, the vertical cross-section of the positioning pin 100 is T-shaped, and a reinforcing connection mechanism 200 is installed inside the positioning pin 100;

[0046] The coupling includes a first chuck and a second chuck, the first chuck and the second chuck are clamped with each other, one end of the first chuck and the second chuck are provided with rectangular holes that are connected to each other and match the horizontal cross-sectional shape of the positioning pin 100, one end of the positioning pin 100 passes through the upper rectangular hole and is plugged into the lower rectangular hole, all structures except the ceramic rod 241 in the strengthening connection mechanism 200 are staggered with the axis of the coupling, two horizontal slots are provided inside the first chuck and are connected to the rectangular hole, one end of the plug column 220 is plugged into the horizontal slot, the opposite ends of the first chuck and the second chuck are fixedly connected with mounting tubes, and the surface of the mounting tubes is threadedly connected with positioning bolts;

[0047] When the staff needs to connect the coupling with the motor and impeller for the fire pump, first, the mounting cylinders on the first chuck and the second chuck are respectively mounted on the surface of the motor output shaft and the impeller shaft, and then the two mounting cylinders are fastened to the surface of the motor output shaft and the impeller shaft by rotating the positioning bolts. Then, the first chuck and the second chuck are manually clamped to each other, and the two rectangular holes are aligned. Then, the positioning pin 100 is passed through the upper rectangular hole and the lower rectangular hole in turn until the positioning pin 100 is plugged into place. At this time, the coupling is installed.

[0048] like Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the interior of the positioning pin 100 is provided with an installation cavity 110, and the surface of the positioning pin 100 is provided with a horizontal sliding cavity 120 connected to the installation cavity 110. The strengthening connection mechanism 200 includes a counterweight block 210, a column 220 and a rubber spring 230. The counterweight block 210 is slidably connected to the interior of the installation cavity 110, and the column 220 is slidably connected to the interior of the horizontal sliding cavity 120. One end of the column 220 extends to the outside of the horizontal sliding cavity 120, and the other end of the column 220 is provided with a slope 221 toward the counterweight block 210. The surface of the column 220 is provided with a mounting opening 222, and the rubber spring 230 is embedded and installed in the interior of the mounting opening 222. Both ends of the rubber spring 230 are fixedly connected to the horizontal sliding cavity 120.

[0049] The horizontal cross-sectional shapes of the installation cavity 110 and the counterweight block 210 are both matched circular shapes. The top of the counterweight block 210 is now set below the slope 221, which can limit the movement range of the counterweight block 210 to ensure that the counterweight block 210 can normally push the plug post 220 outward; the corners of the counterweight block 210 facing the slope 221 are rounded, and the rounded corners of the counterweight block 210 are always set below the highest point of the slope 221, which can reduce the contact friction between the counterweight block 210 and the slope 221, so that the counterweight block 210 can more easily push the plug post 220 outward; the vertical cross-sectional shape of one end of the plug post 220 is an arc shape, and the plug post 220 The center point of the arc cross section is now set inside the horizontal sliding cavity 120. Under the premise that there is no need to actively adjust the position of the plug post 220, this can reduce the difficulty of connecting or separating the positioning pin 100 with the rectangular hole in a non-rotating state, making the loading and unloading operations of the staff easier; the installation opening 222 is parallel to the corners of the installation cavity 110 and has rounded corners, which can reserve sufficient expansion space for the rubber spring 230 to avoid the rubber spring 230 being excessively squeezed in the gap between the plug post 220 and the horizontal sliding cavity 120, so that the plug post 220 is stuck in place by the rubber spring 230, and then the plug post 220 cannot move normally;

[0050] When the positioning pin 100 penetrates into the rectangular hole, the positioning pin 100 drives the plug post 220 to move together through the horizontal sliding cavity 120. When the arc surface of the plug post 220 contacts the corner of the upper rectangular hole, the corner of the rectangular hole can easily press the plug post 220 back into the horizontal sliding cavity 120. At the same time, the plug post 220 compresses the rubber spring 230 through the installation opening 222. When the positioning pin 100 is plugged into place, the horizontal sliding cavity 120 is just aligned with the horizontal slot. The rubber spring 230 quickly pushes the plug post 220 back through the installation opening 222, and the arc surface of the plug post 220 penetrates into the interior of the horizontal slot.

[0051] When the staff needs to remove the positioning pin 100, the staff only needs to apply force to pull out the positioning pin 100. At this time, the corners of the horizontal slot press against the arc surface of the column 220, and the column 220 can be pressed back into the horizontal slide groove, so that the positioning pin 100 can be quickly pulled out.

[0052] like Figure 4 , Figure 5 and Figure 7 As shown, a T-shaped cavity 130 is provided at the top of the positioning pin 100, and the reinforced connection mechanism 200 also includes a warning component 240, which includes a ceramic rod 241 and a mounting block 242. The ceramic rod 241 is fixedly connected to the inner bottom wall of the T-shaped cavity 130, and the mounting block 242 is fixedly connected to the top of the ceramic rod 241, and the mounting block 242 is arranged inside the T-shaped cavity 130. An air guide cavity 2421 is provided at one end of the mounting block 242, and the horizontal cross-section of the air guide cavity 2421 is hourglass-shaped. Only the bottom of the ceramic rod 241 is fixedly connected to the T-shaped cavity 130, and other parts of the ceramic rod 241 are only in contact with the T-shaped cavity 130.

[0053] There are two horizontal sliding cavities 120, two plug posts 220 and two rubber springs 230. The two horizontal sliding cavities 120, the two plug posts 220 and the two rubber springs 230 are symmetrically distributed on both sides of the axis of the T-shaped cavity 130, which can improve the locking effect of the positioning pin 100, so as to improve the stability of the operation of the positioning pin 100; the number of air guide cavities 2421 is not less than two, and the air guide cavities 2421 are evenly distributed at one end of the mounting block 242, which can increase the frequency and loudness of the noise generated by the air flow, thereby improving the warning effect to the surrounding staff; the axis of the air guide cavity 2421 and the plug post 220 are parallel The opening of the air guide cavity 2421 can be set toward the air surrounding the axis of the coupling to ensure that the airflow can enter and exit the air guide cavity 2421 normally; the interior of the positioning pin 100 is provided with a guide cavity 140 connected to the T-shaped cavity 130, and the interior of the guide cavity 140 is slidably connected with a guide block 243 fixedly connected to the ceramic rod 241, and the horizontal cross-sectional dimensions of the guide cavity 140 and the guide block 243 are both larger than the horizontal cross-sectional dimensions of the T-shaped cavity 130 and the guide cavity 140 where the guide cavity 140 is connected, which can limit the distance of the installation block 242 from the T-shaped cavity 130, so that the air guide cavity 2421 can generate noise stably in coordination with the airflow;

[0054] When the positioning pin 100 is squeezed and deformed, the positioning pin 100 drives the T-shaped cavity 130 to deform synchronously. Since the ceramic rod 241 itself is relatively brittle, the T-shaped cavity 130 is very likely to break the ceramic rod 241 during the deformation process. At this time, the mounting block 242 and the guide block 243 lose their blocking at the same time. The mounting block 242 is thrown out of the T-shaped cavity 130 under the action of the rotating centrifugal force. At the same time, the guide cavity 140 limits the distance between the mounting block 242 and the T-shaped cavity 130 to a constant value through the guide block 243 and the ceramic rod 241. During the rotation, the airflow is guided into the air guide cavity 2421 at high speed. Since the horizontal cross-section of the air guide cavity 2421 is in the shape of an hourglass, the contact surface between the airflow and the inner wall of the air guide cavity 2421 gradually decreases. At this time, the collision frequency between the airflow and the air guide cavity 2421 gradually increases, and the noise generated by the collision between the airflow and the air guide cavity 2421 also gradually increases. This can serve to warn the surrounding staff so that they can come to check and deal with it in time, so as to reduce the probability of damage to the fire pump or safety hazards caused by excessive deformation or breakage of the positioning pin 100.

[0055] Working principle: During the rotation of the coupling, since all structures except the ceramic rod 241 in the reinforced connection mechanism 200 are offset from the axis of the coupling, the counterweight block 210 slides along the installation cavity 110 toward the axis of the coupling under the action of the rotating centrifugal force. During this process, the counterweight block 210 presses against the slope 221 of the plug column 220. At this time, the plug column 220 slides into the horizontal slot along the horizontal sliding cavity 120 under the action of the pushing force. The horizontal slot prevents the positioning pin 100 from moving outside the rectangular hole through the plug column 220 and the horizontal sliding cavity 120, and as the rotation speed of the coupling increases, the depth and insertion strength of the plug column 220 inserted into the horizontal slot also increase, so that the positioning pin 100 is stably set inside the rectangular hole, thereby reducing the probability of the positioning pin 100 loosening or even falling off.

[0056] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A shaft locking device for a ship fire pump, comprising a positioning latch (100), characterized in that: The vertical cross-section of the positioning pin (100) is T-shaped, and a reinforcing connection mechanism (200) is installed inside the positioning pin (100); The interior of the positioning pin (100) is provided with an installation cavity (110), the surface of the positioning pin (100) is provided with a horizontal sliding cavity (120) connected to the installation cavity (110), the reinforcing connection mechanism (200) comprises a counterweight (210), a plug column (220) and a rubber spring (230), the counterweight (210) is slidably connected to the interior of the installation cavity (110), the plug column (220) is slidably connected to the interior of the horizontal sliding cavity (120), one end of the plug column (220) passes through the outside of the horizontal sliding cavity (120), the other end of the plug column (220) is provided with a slope (221) facing the counterweight (210), the surface of the plug column (220) is provided with an installation opening (222), the rubber spring (230) is embedded and installed in the interior of the installation opening (222), and both ends of the rubber spring (230) are fixedly connected to the horizontal sliding cavity (120).

2. The shaft locking device for a ship fire pump according to claim 1, characterized in that: The top of the positioning pin (100) is provided with a T-shaped cavity (130), and the reinforcing connection mechanism (200) further comprises a warning component (240), wherein the warning component (240) comprises a ceramic rod (241) and a mounting block (242), wherein the ceramic rod (241) is fixedly connected to the inner bottom wall of the T-shaped cavity (130), and the mounting block (242) is fixedly connected to the top of the ceramic rod (241), and the mounting block (242) is arranged inside the T-shaped cavity (130), and an air guide cavity (2421) is provided at one end of the mounting block (242), and the horizontal cross-section of the air guide cavity (2421) is in the shape of an hourglass.

3. The shaft locking device for a ship fire pump according to claim 1, characterized in that: The horizontal cross-sectional shapes of the installation cavity (110) and the counterweight block (210) are both matching circular shapes, and the top of the counterweight block (210) is arranged below the slope (221).

4. The shaft locking device for a ship fire pump according to claim 1, characterized in that: The corners of the counterweight block (210) facing the slope (221) are rounded, and the rounded corners of the counterweight block (210) are always arranged below the highest point of the slope (221).

5. The shaft locking device for a ship fire pump according to claim 1, characterized in that: The vertical cross-section of one end of the plug post (220) is in the shape of an arc, and the center point of the arc cross-section of the plug post (220) is arranged inside the horizontal sliding cavity (120).

6. The shaft locking device for a ship fire pump according to claim 1, characterized in that: The corners of the installation opening (222) parallel to the installation cavity (110) are rounded.

7. The shaft locking device for a ship fire pump according to claim 2, characterized in that: The number of the horizontal sliding cavity (120), the plug post (220) and the rubber spring (230) is two, and the two horizontal sliding cavities (120), the two plug posts (220) and the two rubber springs (230) are symmetrically distributed on both sides of the axis of the T-shaped cavity (130).

8. The shaft locking device for a ship fire pump according to claim 2, characterized in that: The number of the air guide cavities (2421) is not less than two, and the air guide cavities (2421) are evenly distributed at one end of the mounting block (242).

9. The shaft locking device for a ship fire pump according to claim 8, characterized in that: The axial center lines of the air guide cavity (2421) and the plug post (220) are parallel.

10. The shaft locking device for a ship fire pump according to claim 9, characterized in that: The interior of the positioning pin (100) is provided with a guide cavity (140) connected to the T-shaped cavity (130); the interior of the guide cavity (140) is slidably connected to a guide block (243) fixedly connected to the ceramic rod (241); the horizontal cross-sectional dimensions of the guide cavity (140) and the guide block (243) are both larger than the horizontal cross-sectional dimensions of the connection point between the T-shaped cavity (130) and the guide cavity (140).

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