Lock for mechanical cabin door

Abstract

The lock for the mechanical cabin door comprises a cabin body and a cabin door rotationally connected to the cabin body, a positioning seat is arranged on the inner side of the cabin door, a positioning mechanism is arranged between the positioning seat and a protective cover, a linkage mechanism is connected to the positioning mechanism, and the linkage mechanism comprises a rotating disc, a linkage plate, a connecting column and a pin plate. The positioning seat is provided with a positioning groove and a plurality of locking grooves, the positioning mechanism comprises a positioning head, a positioning column and a spring, and the driving rocking handle drives the positioning mechanism to rotate through the transverse rod and the longitudinal rod, so that the pin plate locks the cabin door; reliable locking of the cabin door can be achieved in the ship body operation vibration state, accidental opening caused by locking loosening is avoided, the protective cover seals key components of the locking mechanism, the corrosion resistance is improved, the linkage mechanism is matched with the guide structure to form multi-point mechanical locking, and the sealing performance and impact resistance stability of the cabin door are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of cabin sealing control, and in particular relates to a lock for a mechanical cabin door. Background Art

[0002] In equipment such as ships, submersibles, and offshore platforms, where airtightness and safety are paramount, hatches serve as critical structures that isolate the interior of the vessel or equipment from the external environment. Their closed state is directly related to the airtightness of the equipment and the safety of the operators. Traditional mechanical hatch locks often use simple latches or rotating hooks. While convenient, these structures can easily become loose due to mechanical play or a loose lock when the vessel is underway, swaying, or experiencing severe vibrations. In severe cases, this can even cause the hatch to open accidentally, posing a significant safety hazard.

[0003] Furthermore, existing hatch lock structures are susceptible to rusting of locking mechanism components during use due to seawater erosion or high humidity. This makes locking reliability and long-term stability difficult to guarantee, especially without a sealing structure between the positioning mechanism and the linkage mechanism. Even with protective covers, some devices fail to fully enclose the key moving parts of the locking mechanism, potentially leading to rusting or jamming, which can affect the hatch's normal closing and opening, reducing efficiency. Summary of the Invention

[0004] In response to the problems existing in the prior art, the purpose of the present invention is to provide a new type of mechanical cabin door lock structure with a compact structure, high locking reliability, and good protection performance, so as to improve the safety and durability of the cabin door under special working conditions and solve the problems of loose locking and insufficient protection existing in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions: A lock for a mechanical cabin door, comprising a cabin body and a cabin door rotatably connected to the cabin body; A positioning seat is fixedly connected to the inner center of the hatch, and one end of the positioning seat is connected to a protective cover; A positioning mechanism is provided in the space between the positioning seat and the protective cover, and the positioning mechanism can rotate in the space between the positioning seat and the protective cover; The positioning mechanism is connected to a linkage mechanism; The linkage mechanism includes a turntable, on which a linkage plate is symmetrically arranged, one end of the linkage plate is fixedly connected to a connecting column, and one end of the connecting column is rotatably connected to a pin plate; When the positioning mechanism drives the linkage mechanism to rotate, the pin plate can be pushed to lock the hatch.

[0006] Furthermore, a positioning groove is provided at one end of the positioning seat, and locking grooves are provided at equal intervals around the central axis of the positioning seat inside the positioning groove; The positioning mechanism comprises a positioning head located inside the positioning groove, and the outer side surface of the positioning head is fixedly connected with a locking strip adapted to the locking groove.

[0007] Furthermore, the positioning groove and the positioning head are configured to be truncated cone-shaped; The bottom of the positioning head is fixedly connected with a positioning column, and a spring is sleeved on the positioning column; A through hole is formed on the top of the protective cover, and a positioning post is provided through the through hole.

[0008] Furthermore, one end of the positioning column is fixedly connected to a first plug-in column, and one end of the first plug-in column is fixedly connected to a first pin joint; A driving crank is pinned to the first pin joint; The driving crank comprises a cross bar, a longitudinal bar is fixedly connected to the center of the side of the cross bar, a second pin joint is fixedly connected to one end of the longitudinal bar, and the second pin joint is connected to the first pin joint via a pin.

[0009] Furthermore, the linkage mechanism includes a turntable sleeved on the first plug-in column, and a through slot is formed through the center of the side surface of the turntable; The through groove is configured as a regular polygon.

[0010] Furthermore, the outer side surface of the turntable is symmetrically fixedly connected with a threaded column, and the side surface of the linkage plate is penetrated with a connection hole adapted to the threaded column; by installing a nut on the threaded column, the linkage plate can be connected to the turntable.

[0011] Furthermore, one end of the connecting column is fixedly connected to the second plug-in column, and a plug-in hole is formed through the side surface of one end of the pin plate; the second plug-in column is inserted into the plug-in hole.

[0012] Furthermore, the side of the hatch is symmetrically fixedly connected with a guide seat, the side of the pin plate is penetrated by a guide groove, the guide seat is located in the guide groove, and the pin plate can slide on the guide seat.

[0013] Furthermore, a baffle is fixedly connected to the side of the hatch, and a limiting groove is provided on the side of the baffle, and a sealing ring is embedded in the limiting groove; When the door is locked on the warehouse body, the sealing ring fits tightly against the warehouse body.

[0014] Furthermore, a pin connection seat is symmetrically fixedly connected to one side of the baffle, and the pin connection seat is rotatably connected to the warehouse body through a pin.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a positioning seat on the inner side of the hatch and arranges a positioning mechanism between the positioning seat and the protective cover, so that the positioning head can always fit with the locking groove in the positioning groove under the action of the spring, thereby ensuring that the locking structure remains in a fastened state under the vibration environment of the hull operation, solving the problem of accidental opening of the traditional hatch locking structure due to loose locking, and improving the safety and stability of the hatch in complex sea conditions.

[0016] By setting multiple locking grooves between the positioning head and the positioning groove, and adopting a truncated cone structure to cooperate with each other, multi-angle limitation can be achieved during the locking process, thereby improving the impact resistance of the structure; at the same time, the locking strip and the locking groove are matched in a strip-groove type, which avoids the problem of slipping of the locking position, ensures positioning accuracy and locking reliability, and fundamentally solves the hidden danger of locking failure caused by loose clearance in traditional structures.

[0017] The present invention adds a protective cover on the outside of the positioning mechanism, which fully encloses and covers key locking components such as the positioning head, positioning column and spring, preventing the components from rusting and getting stuck due to the intrusion of water vapor, salt spray or dust, effectively improving the durability of the locking mechanism in humid and corrosive environments, and overcoming the problem of reduced structural life due to imperfect protective measures in the existing technology.

[0018] By setting up a linkage mechanism and a pin plate, the linkage mechanism rotates synchronously under the drive of the positioning mechanism, and drives the pin plate to insert into the guide seat, forming a mechanical lock between the hatch and the warehouse body, thereby realizing a double locking function, solving the structural deflection problem caused by uneven force in single-point locking, and significantly improving the overall stability of the locking structure.

[0019] The present invention adopts a pin-connected drive crank handle and is equipped with a detachable plug-in connection structure. The operator can drive the entire locking structure to rotate and unlock by twisting the cross bar. The operation method is simple and efficient. At the same time, the structural combination is firm and reliable, which effectively solves the problems of cumbersome operation or unstable connection in traditional structures and enhances the convenience of use and assembly consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The structure of the present invention is schematically shown Figure 1 ; Figure 2 The structure of the present invention is schematically shown Figure 2 ; Figure 3 Schematic diagram of the structure of the hatch of the present invention; Figure 4 It is a structural schematic diagram of the protective cover of the present invention; Figure 5 The structural diagram of the positioning mechanism of the present invention is as follows Figure 1 ; Figure 6The structural diagram of the positioning mechanism of the present invention is as follows Figure 2 ; Figure 7 It is a structural schematic diagram of the linkage mechanism of the present invention; Figure 8 This is a schematic structural diagram of the connecting column of the present invention; Figure 9 It is a structural schematic diagram of the pin plate of the present invention; Figure 10 This is a schematic structural diagram of the driving crank of the present invention.

[0021] In the accompanying drawings, the components represented by the reference numerals are as follows: 1. Hatch door; 11. Baffle; 111. Pin joint; 12. Limiting groove; 13. Sealing ring; 14. Positioning seat; 141. Positioning slot; 142. Locking slot; 15. Guide seat; 2. Warehouse body; 3. Protective cover; 31. Through hole; 4. Positioning mechanism; 41. Positioning head; 411. Locking strip; 42. Positioning column; 43. Spring; 44. First plug-in column; 45. First pin connector; 5. Linkage mechanism; 51, turntable; 511, through slot; 512, threaded column; 52, linkage plate; 521, connection hole; 53, connection column; 531, second plug column; 6. Pin plate; 61. Guide slot; 62. Connecting hole; 7. Driving crank; 71. Crossbar; 72. Longitudinal bar; 721. Second pin joint. DETAILED DESCRIPTION

[0022] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the following examples. It should be understood that the following text is only used to describe one or more specific embodiments of the present invention and does not strictly limit the scope of protection of the present invention.

[0023] Example 1: See Figure 1-10 , a lock for a mechanical cabin door, comprising a cabin body 2 and a cabin door 1 rotatably connected to the cabin body 2; A positioning seat 14 is fixedly connected to the inner center of the hatch 1, and the positioning seat 14 is used to install the positioning mechanism 4 and guide and constrain its movement position; One end of the positioning seat 14 is connected to a protective cover 3, which is in the shape of a shell and covers the outside of the positioning mechanism 4. The protective cover 3 is sealed with the positioning seat 14 by fixing screws to prevent salt spray, water vapor or oil from entering the rotating structure area of ​​the positioning mechanism 4 and causing jamming or rust. A positioning mechanism 4 is provided in the space between the positioning seat 14 and the protective cover 3. The positioning mechanism 4 is inserted into the through hole 31 at the top of the protective cover 3 through the positioning column 42 and rotates around the axis within the space. The positioning mechanism 4 is connected to a linkage mechanism 5, and the linkage mechanism 5 and the rotating structure of the positioning mechanism 4 are connected to each other through a turntable 51, so that a synchronous linkage action can be achieved when the crank handle 7 is operated. The linkage mechanism 5 includes a rotating disk 51 on which a linkage plate 52 is symmetrically arranged. The linkage plate 52 is assembled with a threaded column 512 on the outer periphery of the rotating disk 51 through a connecting hole 521 and is fastened with a nut to ensure rotation synchronization. One end of the linkage plate 52 is fixedly connected to a connecting column 53, and a second plug-in column 531 for plugging and sliding is provided on the connecting column 53, which is used to connect with the pin plate 6 to realize locking transmission; One end of the connecting post 53 is rotatably connected to a pin plate 6. The pin plate 6 cooperates with the guide seat 15 on the side of the hatch 1 through the guide slot 61. Driven by the linkage mechanism 5, it can slide linearly along the guide seat 15 and finally insert into the gap area between the hatch 1 and the cabin body 2 to complete the locking action. When the positioning mechanism 4 drives the linkage mechanism 5 to rotate, it can push the pin plate 6 to lock the hatch 1.

[0024] See Figure 1-6 A positioning groove 141 is provided at one end of the positioning seat 14. The positioning groove 141 is a truncated cone-shaped ring groove structure, which can provide a rotational matching interface for the positioning head 41. At the same time, the locking and positioning function is achieved through the docking locking groove 142 structure; The interior of the positioning groove 141 is provided with locking grooves 142 at equal intervals around the central axis of the positioning seat 14. The locking grooves 142 are radially arranged groove structures for achieving precise engagement with the locking strips 411 on the positioning head 41. The positioning mechanism 4 includes a positioning head 41 located inside the positioning groove 141. The positioning head 41 is connected to the protective cover 3 through a positioning column 42 and is retained inside the positioning groove 141 for rotational movement. The outer side surface of the positioning head 41 is fixedly connected with a locking strip 411 adapted to the locking groove 142. The locking strip 411 is a strip-shaped tongue structure protruding outward, which can be inserted into the locking groove 142 during rotation to form a limit lock.

[0025] See Figure 1-6 , the shape of the positioning groove 141 and the positioning head 41 is set to be a truncated cone; The bottom of the positioning head 41 is fixedly connected to a positioning column 42, which is cylindrical and vertically penetrates the through hole 31 on the top of the protective cover 3; A spring 43 is sleeved on the positioning post 42. One end of the spring 43 abuts against the bottom of the positioning head 41, and the other end abuts against the inner wall of the protective cover 3, thereby providing a continuous axial elastic force to push the positioning head 41 toward the positioning slot 141. A through hole 31 is formed on the top of the protective cover 3. The through hole 31 is a limiting hole structure for accommodating the upward and downward movement of the positioning column 42, ensuring a sliding fit between the positioning column 42 and the protective cover 3 and providing elastic reset space.

[0026] See Figure 6-10 One end of the positioning column 42 is fixedly connected to the first plug-in column 44, and the first plug-in column 44 is axially inserted into the connecting hole in the middle of the turntable 51 to realize linkage transmission; One end of the first plug-in column 44 is fixedly connected to a first pin joint 45. The first pin joint 45 is a rectangular groove structure with a pin through hole reserved thereon for detachable pin connection with the driving crank 7. A driving crank 7 is pinned to the first pin joint 45. The driving crank 7 is formed into an L-shaped structure that can be manually operated through a horizontal rod 71 and a vertical rod 72. The driving crank 7 includes a crossbar 71, and a longitudinal rod 72 is fixedly connected to the center of the side of the crossbar 71. The longitudinal rod 72 is used to drive the entire positioning and locking structure to rotate in a linked manner when the operator manually pulls it; One end of the longitudinal rod 72 is fixedly connected to a second pin joint 721 , and the second pin joint 721 is plugged into the first pin joint 45 via a pin, thereby achieving transmission of operating force and convenience of assembly and disassembly of the structure.

[0027] See Figure 7-10 , the linkage mechanism 5 includes a turntable 51 sleeved on the first plug-in column 44, the turntable 51 is tightly sleeved on the first plug-in column 44 through the center hole and can rotate therewith; A through slot 511 is formed at the center of the side surface of the rotating disk 51 . The through slot 511 is configured as a regular polygonal structure to enhance the stability of the rotational coupling with the linkage plate 52 .

[0028] See Figure 7-10 The outer side surface of the turntable 51 is symmetrically fixedly connected with a threaded column 512, which is used to mechanically connect with the linkage plate 52; the side surface of the linkage plate 52 is penetrated by a connection hole 521 adapted to the threaded column 512. The connection hole 521 is a through-hole structure, and after cooperating with the threaded column 512, a reliable connection is achieved by installing a nut; By installing a nut on the threaded column 512, the linkage plate 52 can be connected to the turntable 51, ensuring that the linkage plate 52 and the turntable 51 rotate in a consistent and synchronous manner during the rotation process.

[0029] See Figure 9 One end of the connecting column 53 is fixedly connected to the second plug-in column 531, and the second plug-in column 531 is inserted into the plug-in hole 62 of the pin plate 6; A plug hole 62 is formed through the side surface of one end of the pin plate 6. The plug hole 62 is a cylindrical through-hole structure, which is used to achieve a reliable connection between the pin plate 6 and the connecting column 53 and to withstand thrust for sliding guidance during operation.

[0030] See Figure 1 and Figure 9 , the side of the hatch 1 is symmetrically fixedly connected with a guide seat 15, the guide seat 15 is a slide groove structure, arranged along the side of the hatch 1 and used to guide the movement direction of the pin plate 6; A guide groove 61 is provided through the side of the pin plate 6. The guide groove 61 is a long strip slide structure. The guide seat 15 is located in the guide groove 61, ensuring that the pin plate 6 only slides along the direction of the guide seat 15 under the drive of the linkage mechanism 5, avoiding the occurrence of jamming or derailment due to shaking or force displacement.

[0031] See Figure 1-3 , a baffle 11 is fixedly connected to the side of the hatch 1. The baffle 11 is a rectangular plate structure used to cover the locking edge and improve the sealing strength of the hatch; A limiting groove 12 is provided on the side of the baffle 11. The limiting groove 12 is an embedded annular notch, and the embedded structure is used to arrange a sealing ring 13. A sealing ring 13 is embedded in the limiting groove 12. The sealing ring 13 is made of elastic rubber. When the cabin door 1 is locked on the warehouse body 2, the sealing ring 13 fits tightly with the warehouse body 2 to ensure the airtightness of the cabin and improve the seismic resistance.

[0032] See Figure 1-3 , one side of the baffle 11 is symmetrically fixedly connected with a pin connection seat 111, the pin connection seat 111 is a trunnion structure and is symmetrically arranged along both sides of the cabin door 1; The pin connection seat 111 is rotatably connected to the warehouse body 2 via a pin. The pin serves as a rotating shaft connector to hinge the hatch 1 to the warehouse body 2 and allow it to be opened and closed around the axis, ensuring convenient operation and stable structure.

[0033] Example 2: See Figure 1-10This embodiment provides a lock for the machinery compartment door of a medium-sized ocean transport vessel. The hatch door 1 is 20 mm thick and made of SUS304 stainless steel. The chamber 2 is made of Q235 steel plate and features a rubber cushioning strip to mitigate the impact of closing. A positioning seat 14 is located in the center of the hatch door 1. A positioning head 41 coated with an anti-corrosion coating is embedded between the positioning seat 14 and the protective cover 3. The positioning head 41 is provided with a locking bar 411 made of H62 brass and mates with six equally spaced locking slots 142 within the positioning slot 141. The positioning column 42 is made of galvanized carbon steel, and the outer spring 43 is a 65Mn steel wire spring installed in the top through-hole 31 of the protective cover 3. The protective cover 3 is integrally cast from ADC12 aluminum alloy. This structure ensures that the locking bar 411 remains locked in the locking slot 142 during the vibration of the ship's operation, preventing the locking mechanism from loosening and ensuring that the hatch door 1 remains securely closed.

[0034] Comparative case: Conventional door locking devices using a threaded knob often experience loosening under severe vibration, leading to the locking mechanism falling off and the lock body slipping, potentially causing the door to open unexpectedly. This embodiment effectively overcomes this problem by utilizing elastic positioning and a multi-locking groove structure, ensuring safety.

[0035] Example 3: See Figure 1-6 In this embodiment, the positioning groove 141 and the positioning head 41 are configured as a truncated cone-shaped structure that is wide at the top and narrow at the bottom. The positioning groove 141 is integrally formed from 316L stainless steel, and the locking grooves 142 are arranged at 60° angles around the structure to form a six-point limiting structure. The locking strip 411 is manufactured by precision milling of QSn6.5-0.1 tin bronze and fits tightly with the locking groove 142. The positioning column 42 has a diameter of 12 mm and is equipped with a spring 43 with an axial guide groove on the top. The guide groove is used to maintain the linear motion trajectory of the positioning column 42 and improve the stability of the elastic force transmission. The through hole 31 opened on the top of the protective cover 3 is a guide hole structure with the assistance of a rubber sealing ring to effectively prevent water vapor from intruding into the interior.

[0036] Comparative case: Some existing hatch door structures use a flat contact locking method, where the lock head and lock slot are flatly connected. Due to the small contact area and unstable angle, they are prone to loosening and slipping under repeated vibration. This embodiment adopts a frustum-shaped structure and multi-angle locking positions to improve seismic stability and multi-angle locking effect.

[0037] Example 4: See Figure 6-10In this embodiment, to effectively prevent the locking mechanism from becoming stuck due to seawater corrosion, a fully enclosed protective cover 3 is used. The exterior of the protective cover 3 is sealed with waterproof rubber strips, and the internal positioning post 42 is fixed by threads. Spring 43 utilizes a bi-conical variable force structure to enhance compression stability. The positioning head 41 and positioning post 42 are integrally molded, and the exterior is sprayed with a PTFE anti-corrosion coating, making them suitable for operation in perennially high-humidity environments. After installation, all moving parts are sealed by the protective cover 3, achieving an IP56 protection rating, effectively preventing salt spray corrosion and the intrusion of mechanical foreign objects.

[0038] Comparative case: In traditional structures, the positioning head is exposed to the air, and after long-term use, salt crystallization and rust often cause rotation jamming, making maintenance difficult and shortening the service life. This embodiment solves the corrosion problem from the root through a sealed design, significantly improving reliability and service life.

[0039] Example 5: See Figure 7-10 This embodiment uses a linkage mechanism 5 to achieve a double locking structure. The turntable 51 is made of aluminum bronze ZCuAl10Fe3. Two threaded columns 512 with a diameter of M6 are symmetrically fixed on its outer circumference. The threaded columns are tightly fitted into the connecting holes 521 of the linkage plate 52 and fixed with hexagonal nuts. The linkage plate 52 is laser cut from 304 stainless steel and welded to the connecting column 53. The connecting column 53 extends into a second plug-in column 531 to connect to the pin plate 6. The pin plate 6 is provided with a guide groove 61 and inserted into the guide seat 15 on the side of the cabin door 1. When the operator pulls the driving crank 7, the horizontal rod 71 and the vertical rod 72 form a lever mechanism, which drives the turntable 51 to rotate through the pin joint, thereby driving the pin plate 6 to slide into the gap between the cabin door 1 and the warehouse body 2, forming a double-point lock and enhancing the stability of the cabin door closure.

[0040] Comparative case: Traditional hatch structures rely solely on a single-sided locking hook for closure. This can lead to one end becoming disengaged during vibration, causing the entire hatch to open, resulting in uneven locking. The linkage-sliding pin structure described in this embodiment achieves two-point mechanical locking, effectively improving the structure's resistance to vibration and shock.

[0041] The working principle of the present invention is: When the hatch 1 needs to be closed, one only needs to hold the crossbar 71 with both hands and make the longitudinal bar 72 perpendicular to the plane where the hatch 1 is located, and then pull the crossbar 71 away from the hatch 1. As the pulling force increases, the locking strip 411 provided on the positioning head 41 will separate from the locking groove 142 provided in the positioning groove 141. Then, the crossbar 71 is rotated clockwise. As the crossbar 71 rotates, the positioning mechanism 4 and the linkage mechanism 5 are driven to rotate synchronously. During the rotation of the linkage mechanism 5, the pin plate 6 installed at one end of the connecting column 53 slides on the guide seat 15. When one end of the pin plate 6 passes the connection between the hatch 1 and the cabin body 2, the driving crank 7 stops rotating. Then release the hands holding the crossbar 71. At this time, under the elastic force of the positioning column 42, the positioning head 41 will move toward the positioning seat 14, and the locking bar 411 will be locked into the locking groove 142. Since the spring 43 always exerts elastic force on the positioning head 41, the locking strip 411 can fit more tightly with the locking groove 142; In this way, when the hull is traveling on the water, the hatch 1 and the cabin body 2 are always in a vibrating state, and with the cooperation of the positioning mechanism 4, the linkage mechanism 5 and the pin plate 6, the hatch 1 can be prevented from accidentally opening. At the same time, the protective cover 3 seals and protects the positioning head 41 and the positioning column 42, thereby preventing rust from forming between the positioning mechanism 4 and the positioning seat 14, and allowing the hatch 1 to be closed and opened smoothly.

[0042] The foregoing is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained herein shall, unless otherwise specified or limited, be implemented in accordance with conventional means in the art.

Claims

1. A lock for a machinery compartment door, characterized by: It comprises a warehouse body (2) and a hatch (1) rotatably connected to the warehouse body (2); A positioning seat (14) is fixedly connected to the inner center of the hatch (1), and one end of the positioning seat (14) is connected to a protective cover (3); A positioning mechanism (4) is provided in the space between the positioning seat (14) and the protective cover (3), and the positioning mechanism (4) can rotate in the space between the positioning seat (14) and the protective cover (3); The positioning mechanism (4) is connected to a linkage mechanism (5); The linkage mechanism (5) includes a rotating disk (51), a linkage plate (52) is symmetrically arranged on the rotating disk (51), one end of the linkage plate (52) is fixedly connected to a connecting column (53), and one end of the connecting column (53) is rotatably connected to a pin plate (6); When the positioning mechanism (4) drives the linkage mechanism (5) to rotate, the pin plate (6) can be pushed to lock the hatch (1).

2. A lock for a machinery compartment door according to claim 1, characterized in that: A positioning groove (141) is provided at one end of the positioning seat (14), and locking grooves (142) are provided inside the positioning groove (141) at equal intervals around the central axis of the positioning seat (14); The positioning mechanism (4) comprises a positioning head (41) located inside the positioning groove (141), and a locking strip (411) adapted to the locking groove (142) is fixedly connected to the outer side surface of the positioning head (41).

3. The lock for a machinery compartment door according to claim 2, characterized in that: The positioning groove (141) and the positioning head (41) are configured to be truncated cone-shaped; The bottom of the positioning head (41) is fixedly connected to a positioning column (42), and a spring (43) is sleeved on the positioning column (42); A through hole (31) is provided through the top of the protective cover (3), and a positioning column (42) is provided through the through hole (31).

4. The lock for a machinery compartment door according to claim 3, characterized in that: One end of the positioning column (42) is fixedly connected to a first plug column (44), and one end of the first plug column (44) is fixedly connected to a first pin joint (45); A driving crank (7) is pin-connected to the first pin joint (45); The driving crank (7) comprises a crossbar (71), a longitudinal bar (72) fixedly connected to the center of the side of the crossbar (71), a second pin joint (721) fixedly connected to one end of the longitudinal bar (72), and the second pin joint (721) and the first pin joint (45) are connected via a pin.

5. The lock for a machinery compartment door according to claim 4, characterized in that: The linkage mechanism (5) comprises a rotating disk (51) sleeved on the first plug-in column (44), and a through slot (511) is provided through the center of the side surface of the rotating disk (51); The through groove (511) is configured as a regular polygon.

6. The lock for a machinery compartment door according to claim 1, characterized in that: The outer side surface of the rotating disk (51) is symmetrically fixedly connected with a threaded column (512), and the side surface of the linkage plate (52) is penetrated by a connection hole (521) adapted to the threaded column (512); by installing a nut on the threaded column (512), the linkage plate (52) can be connected to the rotating disk (51).

7. The lock for a machinery compartment door according to claim 1, characterized in that: One end of the connecting column (53) is fixedly connected to a second plug-in column (531), and a plug-in hole (62) is formed through the side surface of one end of the pin plate (6); the second plug-in column (531) is inserted into the plug-in hole (62).

8. The lock for a machinery compartment door according to claim 7, characterized in that: The side of the hatch (1) is symmetrically fixedly connected with a guide seat (15), and the side of the pin plate (6) is penetrated by a guide groove (61). The guide seat (15) is located in the guide groove (61), and the pin plate (6) can slide on the guide seat (15).

9. The lock for a machinery compartment door according to claim 1, characterized in that: A baffle (11) is fixedly connected to the side of the hatch (1), a limiting groove (12) is provided on the side of the baffle (11), and a sealing ring (13) is embedded in the limiting groove (12); When the hatch (1) is locked on the warehouse body (2), the sealing ring (13) fits tightly against the warehouse body (2).

10. The lock for a machinery compartment door according to claim 9, characterized in that: A pin connection seat (111) is symmetrically fixedly connected to one side of the baffle (11), and the pin connection seat (111) is rotatably connected to the bin body (2) via a pin.

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