A side door lock arrangement for a construction machine

Abstract

The application relates to the technical field of engineering machinery lock devices, and discloses a side door lock device for engineering machinery, which comprises a driven door, a driving door, a spring sliding lock mechanism, a stretching clamping mechanism and a push-pull compression mechanism. The stretching clamping mechanism can solve the problem that the traditional engineering machinery door lock is prone to loosening and failure under vibration and impact. The mechanism converts the linear thrust transmitted by the push-pull compression mechanism into bidirectional locking force. The transverse displacement of the straight plate drives the vertical downward pressing of the circular sliding groove through the inclined surface of the special-shaped plate, forces the long circular rod to drive the sleeve plate to move downward synchronously, and makes the left and right sliding plates reset from the inclined state to the vertical position under the forced guidance of the limiting block. The end of the right sliding plate is accurately clamped into the tooth gap of the gear plate, avoiding the stress relaxation defect of the traditional pure spring lock tongue caused by continuous vibration. Even if the hard spring loses the pre-tightening force due to fatigue, the tooth-shaped clamping can still physically block the return path of the gear plate, and the vibration resistance and stability of the traditional door lock are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of locking devices for construction machinery, and more specifically to a side door lock device for construction machinery. Background Technology

[0002] Engineering door locks are door lock systems specifically designed for engineering scenarios, covering fields such as construction, industry, commerce, and public facilities. Their core functions are to meet the requirements of high security, durability, management efficiency, and scenario adaptability.

[0003] Traditional engineering door locks face the problem of structural failure under vibration and impact. Because they rely on the elastic reset of a single spring latch, continuous vibration can easily lead to spring stress relaxation, which gradually increases the meshing gap between the bolt and the latch. When the door is subjected to lateral impact, the gear plate can easily disengage from the meshing range of the gear lock under the action of inertia, resulting in instantaneous unlocking.

[0004] Existing door locks are slow to respond to door deformation, which can easily lead to sealing failure. Traditional structures require door gap deformation of more than 3mm to trigger locking compensation. However, engineering machinery door frames often produce small displacement elastic deformation under load. At this time, the lock is still in an inactive state. In special environments, traditional slide bars are prone to jamming. After multiple cycles, the mechanism cannot maintain motion accuracy and is prone to malfunctions or failures due to the intrusion of particulate matter. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a side door lock device for engineering machinery to solve the problems existing in the background art.

[0006] The present invention provides the following technical solution: a side door lock device for engineering machinery, comprising a driven door and an active door, wherein a mortise lock is fixedly connected to the front end surface of the active door, a spring slide lock mechanism is rotatably connected to the rear end of the active door and the side corresponding to the mortise lock, a tension locking mechanism is fixedly connected to one side of the spring slide lock mechanism, a driven door is provided on the side of the spring slide lock mechanism away from the tension locking mechanism, and a push-pull pressing mechanism is slidably connected to the bottom of the tension locking mechanism near the spring slide lock mechanism;

[0007] Furthermore, the tensioning and clamping mechanism includes a second-layer compression mechanism fixedly connected to the side of the spring sliding lock mechanism away from the driven door. The bottom of the second-layer compression mechanism is fixedly connected to a first-layer tension mechanism, and a compression rod mechanism is provided inside the second-layer compression mechanism and the first-layer tension mechanism.

[0008] Furthermore, the spring-loaded sliding lock mechanism is the main keyhole structure of this structure. The driven door and the driving door lock each other during the opening and closing process. When one of the driving door and the driven door is subjected to vertical pressure, it will trigger the push-pull pressing mechanism to transmit the pressure to the tension clamping mechanism, and then trigger the locking device through the squeezing rod mechanism to restrict the spring-loaded sliding lock mechanism.

[0009] Furthermore, the spring-loaded sliding lock mechanism includes a large fixed plate fixedly connected to the surface of the active door. A rigid spring is fixedly connected to the side of the large fixed plate near the driven door. A gear plate is fixedly connected to the other side of the rigid spring. A fixing bracket is provided on the outer side of the gear plate and the outer surface of the active door. A pin is fixedly connected to the other side of the gear plate. A latch is provided on the outer surface of the driven door and the outer side of the corresponding pin. A gear lock is fixedly connected to the outer surface of the active door and the top position of the corresponding gear plate. A lock cylinder is fixedly connected to the inner center of the gear lock.

[0010] Furthermore, after the active door is turned, the bolt contacts the latch. Based on the beveled design, the rigid spring is compressed and, under the constraint of the fixed frame, the bolt engages with the latch, thus completing the locking purpose. To unlock, the key is inserted into the lock cylinder. After being turned, the gear lock rotates synchronously with the lock cylinder. When the gears mesh and rotate, they move the gear plate. Compressing the gear plate again pushes the active door to open the lock.

[0011] Furthermore, the push-pull pressing mechanism includes a base plate frame fixedly connected to the outer surface of the active door and the bottom of the spring sliding lock mechanism. A fixed base is fixedly connected to the side of the base plate frame away from the driven door, and a limit plate is fixedly connected to the side of the fixed base near the driven door. A rotating rod is fixedly connected to the center of the base plate frame, and a push plate is rotatably connected to the outer side of the rotating rod. A pressing block is rotatably connected to the end of the push plate away from the driven door. A sliding rod is slidably connected to the center of the fixed base, and a slanted slider is fixedly connected to the end of the sliding rod near the driven door. A connecting plate is fixedly connected to the other end of the sliding rod.

[0012] Furthermore, the driven door is subjected to external pressure, which pushes the push plate to rotate around the rotating rod. The other end of the push plate presses against the inclined slider. The inclined slider is pushed and moves towards the side closer to the active door under the restriction of the sliding rod, transmitting external pressure to the tensioning and clamping mechanism.

[0013] Furthermore, the two-layer pressing mechanism includes a second-layer base fixedly connected to the side of the large fixed plate away from the driven door and the outer surface of the active door. A small fixed plate is fixedly connected to the inner surface of the second-layer base near the bottom, and a limit block is fixedly connected to the outer surface of the small fixed plate.

[0014] Furthermore, the first layer tensioning mechanism includes a first layer base fixedly connected to the bottom of the second layer base, a circular groove slidably connected inside the first layer base, a straight plate slidably connected inside the first layer base and inside the circular groove, and a connecting plate fixedly connected to the side of the straight plate near the driven door.

[0015] Furthermore, the extrusion rod mechanism includes a long cylindrical rod fixedly connected to the top of the circular slide groove. A sleeve plate is fixedly connected to the outer surface of the long cylindrical rod. A connecting plate is fixedly connected to the bottom outer surface of the sleeve plate. A left sliding plate is provided on the outer side of the connecting plate away from the driven door and its top corresponding limit block. A right sliding plate is provided on the outer side of the connecting plate on the other side and its top corresponding limit block. Nuts are provided on the outer surface of the long cylindrical rod and the top of the sleeve plate.

[0016] Furthermore, in the initial position, the bevel of the irregular plate is located at the leftmost end of the inner groove of the circular slide. The circular slide is located inside the first layer of the base, near the upper side. The bevel of the irregular plate fits against the bevel inside the circular slide. When the straight plate feels the thrust transmitted by the push-pull clamping mechanism, it moves further away from the driven door. The straight plate and the irregular plate move to the left synchronously. The irregular plate is confined to a vertical position and can only move left and right. As the irregular plate gradually moves to the left, the bevel presses down on the inner groove of the circular slide due to the action of the bevel, causing the circular slide to slide downward inside the first layer of the base. At the same time, the long cylindrical rod and sleeve plate at the top of the circular slide also move downward synchronously. The left and right sliding plates also move synchronously under the constraint of the connecting plate. Downward, under the constraint of the limiting block, the left and right sliding plates are also in a vertical position. The very end of the right sliding plate is engaged with the gear of the gear plate, restricting and locking the spring sliding lock mechanism. When the irregular plate moves towards the side closer to the driven door, due to gravity, the inclined surface of the irregular plate fits against the inclined surface inside the circular slide groove, and the irregular plate is restricted to a vertical position, only able to move left and right. As the irregular plate gradually moves to the right, the circular slide groove moves upward inside the first layer of the base to return to its original position. At the same time, the left and right sliding plates will also move upward synchronously under the constraint of the connecting plate. Under the constraint of the limiting block, the left and right sliding plates move upward synchronously, that is, the end of the right sliding plate will displace upward, breaking away from the constraint of the gear plate.

[0017] The technical effects and advantages of this invention are as follows:

[0018] This invention, through a tension clamping mechanism and a multi-stage linkage and deformation locking design, solves the problem of traditional engineering machinery door locks easily loosening and failing under vibration and impact. When the door body is subjected to vertical pressure, the mechanism converts the linear thrust transmitted by the push-pull clamping mechanism into a bidirectional locking force. The lateral displacement of the straight plate drives the circular slide groove to press down vertically through the inclined surface of the irregular plate, forcing the long cylindrical rod to drive the sleeve plate to move down synchronously. Under the forced guidance of the limiting block, the left and right sliding plates are reset from the inclined state to the vertical position, so that the end of the right sliding plate is precisely locked into the tooth gap of the gear plate, forming a mechanical hard limit. This avoids the stress relaxation defect of traditional pure spring lock tongue due to continuous vibration. Even if the hard spring loses its preload due to fatigue, the toothed lock can still physically block the return path of the gear plate, which greatly improves the vibration resistance stability compared with traditional door locks.

[0019] This invention, by incorporating a push-pull clamping mechanism and utilizing the principles of lever amplification and inclined plane conversion, significantly improves the door lock's response sensitivity and force transmission efficiency to local deformation. When the driven door is compressed, even a small change in the door gap drives the push plate to rotate around the pivot rod. The short arm amplifies the displacement through a certain leverage ratio, while the long arm pushes the inclined slider to slide along a fixed angle via the compression block. This transforms a small change in the door gap into a large-stroke displacement of the inclined slider, which is then precisely transmitted to the tensioning and clamping mechanism via the sliding rod. Compared to the lag mechanism of traditional door locks that relies on the overall deformation of the door body to trigger locking, this device can complete the locking response when the door gap undergoes minimal deformation. This avoids the persistent problem of lock misalignment caused by slight deformation of the door frame in heavy engineering machinery. At the same time, the rigid guide frame formed by the fixed base and the limiting plate ensures that the mechanism maintains high motion accuracy even in special environments, alleviating the problem of easy jamming and failure of traditional sliding rod mechanisms. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the overall structure of the present invention from the rear.

[0022] Figure 3 This is a schematic diagram of the door lock structure of the present invention.

[0023] Figure 4 This is a schematic diagram of the spring-loaded sliding lock mechanism of the present invention.

[0024] Figure 5 This is a schematic diagram of the push-pull pressing mechanism of the present invention.

[0025] Figure 6 This is a cross-sectional schematic diagram of the tension clamping mechanism of the present invention.

[0026] Figure 7 This is a cross-sectional schematic diagram of the circular chute structure of the present invention.

[0027] Figure 8 This is a cross-sectional schematic diagram of the circular groove and irregular plate structure of the present invention.

[0028] The attached diagram is labeled as follows: 1. Driven door; 2. Active door; 3. Mortise lock; 4. Spring-loaded sliding lock mechanism; 41. Gear lock; 42. Lock cylinder; 43. Hard spring; 44. Fixing frame; 45. Gear plate; 46. Locking buckle; 47. Bolt; 48. Large fixing plate; 5. Tensioning and clamping mechanism; 51. First-layer tensioning mechanism; 511. First-layer base; 512. Irregularly shaped plate; 513. Circular slide groove; 514. Straight plate; 52. Second-layer pressing mechanism; 5 21. Second-layer base; 522. Small fixed plate; 523. Left sliding plate; 524. Right sliding plate; 525. Limiting block; 53. Extrusion rod mechanism; 531. Long round rod; 532. Sleeve plate; 533. Nut; 534. Connecting plate; 6. Push-pull clamping mechanism; 61. Push plate; 62. Base plate frame; 63. Fixed base; 64. Limiting plate; 65. Rotating rod; 66. Extrusion block; 67. Inclined slider; 68. Sliding rod; 69. Connecting plate. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The side door lock device for engineering machinery involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Reference Figure 1 and Figure 2 The present invention provides a side door lock device for engineering machinery, including a driven door 1 and an active door 2. A mortise lock 3 is fixedly connected to the front end surface of the active door 2. A spring slide lock mechanism 4 is rotatably connected to the rear end of the active door 2 and the side corresponding to the mortise lock 3. A tension clamping mechanism 5 is fixedly connected to one side of the spring slide lock mechanism 4. The driven door 1 is provided on the side of the spring slide lock mechanism 4 away from the tension clamping mechanism 5. A push-pull pressing mechanism 6 is slidably connected to the bottom of the tension clamping mechanism 5 near the spring slide lock mechanism 4.

[0031] Reference Figure 3 The tensioning and clamping mechanism 5 includes a second-layer compression mechanism 52 fixedly connected to the side of the spring sliding lock mechanism 4 away from the driven door 1. The bottom of the second-layer compression mechanism 52 is fixedly connected to a first-layer tension mechanism 51. The second-layer compression mechanism 52 and the first-layer tension mechanism 51 are provided with a compression rod mechanism 53 inside.

[0032] Reference Figure 3The spring-loaded sliding lock mechanism 4 is the main lock structure of this structure. The driven door 1 and the driving door 2 are locked together during the opening and closing process. When one of the driving door 2 and the driven door 1 is subjected to vertical pressure, the push-pull pressing mechanism 6 will be triggered to transmit the pressure to the tension clamping mechanism 5, and then the locking device will be triggered through the compression rod mechanism 53 to restrict the spring-loaded sliding lock mechanism 4.

[0033] Reference Figure 4 The spring-loaded sliding lock mechanism 4 includes a large fixed plate 48 fixedly connected to the surface of the active door 2. A rigid spring 43 is fixedly connected to the side of the large fixed plate 48 near the driven door 1. A gear plate 45 is fixedly connected to the other side of the rigid spring 43. A fixing bracket 44 is provided on the outer side of the gear plate 45 and the outer surface of the active door 2. A pin 47 is fixedly connected to the other side of the gear plate 45. A latch 46 is provided on the outer surface of the driven door 1 and the outer side of the corresponding pin 47. A gear lock 41 is fixedly connected to the outer surface of the active door 2 and the top position of the corresponding gear plate 45. A lock cylinder 42 is fixedly connected to the inner center of the gear lock 41.

[0034] Reference Figure 4 After the active door 2 is rotated, the bolt 47 contacts the latch 46. Based on the design of the bevel, the hard spring 43 is compressed and under the restriction of the fixed frame 44, the bolt 47 is engaged in the latch 46, thus completing the locking purpose. When unlocking, the key is inserted into the lock cylinder 42. After rotation, the gear lock 41 rotates synchronously with the lock cylinder 42. When the gears mesh and rotate, they move the gear plate 45. Compression of the gear plate 45 pushes the active door 2 to open the door lock.

[0035] Reference Figure 5 The push-pull pressing mechanism 6 includes a base plate frame 62 fixedly connected to the outer surface of the active door 2 and the bottom of the spring sliding lock mechanism 4. A fixed base 63 is fixedly connected to the side of the base plate frame 62 away from the driven door 1. A limit plate 64 is fixedly connected to the side of the fixed base 63 near the driven door 1. A rotating rod 65 is fixedly connected to the center of the base plate frame 62. A push plate 61 is rotatably connected to the outer side of the rotating rod 65. A pressing block 66 is rotatably connected to the end of the push plate 61 away from the driven door 1. A sliding rod 68 is slidably connected to the center of the fixed base 63. A slanted slider 67 is fixedly connected to the end of the sliding rod 68 near the driven door 1. A connecting plate 69 is fixedly connected to the other end of the sliding rod 68.

[0036] Reference Figure 5 When the driven door 1 is subjected to external pressure, it pushes the push plate 61 to rotate around the rotating rod 65. The other end of the push plate 61 presses the inclined slider 67 accordingly. The inclined slider 67 is pushed and moves towards the side closer to the active door 2 under the restriction of the sliding rod 68, transmitting the external pressure to the tensioning and clamping mechanism 5.

[0037] Reference Figure 6The second-layer extrusion mechanism 52 includes a second-layer base 521 fixedly connected to the side of the large fixed plate 48 away from the driven door 1 and the outer surface of the active door 2. A small fixed plate 522 is fixedly connected to the inner surface of the second-layer base 521 near the bottom. A limit block 525 is fixedly connected to the outer surface of the small fixed plate 522.

[0038] Reference Figure 6 The first layer tensioning mechanism 51 includes a first layer base 511 fixedly connected to the bottom of the second layer base 521. A circular groove 513 is slidably connected inside the first layer base 511. A straight plate 514 is slidably connected inside the first layer base 511 and inside the circular groove 513. A connecting plate 69 is fixedly connected to the side of the straight plate 514 near the driven door 1.

[0039] Reference Figure 7 The extrusion rod mechanism 53 includes a long cylindrical rod 531 fixedly connected to the top of the circular slide groove 513. A sleeve plate 532 is fixedly connected to the outer surface of the long cylindrical rod 531. A connecting plate 534 is fixedly connected to the outer surface of the bottom end of the sleeve plate 532. A left sliding plate 523 is provided on the outer side of the connecting plate 534 away from the driven door 1 and the corresponding limit block 525 on its top. A right sliding plate 524 is provided on the outer side of the connecting plate 534 on the other side and the corresponding limit block 525 on its top. Nuts 533 are provided on the outer surface of the long cylindrical rod 531 and the top of the sleeve plate 532.

[0040] Reference Figure 6 , Figure 7 and Figure 8Initially, the bevel of the irregular plate 512 is located at the leftmost end of the inner groove of the circular slide 513. The circular slide 513 is located inside the first base 511 near the upper side. The bevel of the irregular plate 512 is in contact with the bevel inside the circular slide 513. When the straight plate 514 feels the pushing force transmitted by the push-pull pressing mechanism 6, it moves further away from the driven door 1. The straight plate 514 and the irregular plate 512 move to the left synchronously. The irregular plate 512 is confined to a vertical position and can only move left and right. As the irregular plate 512 gradually moves to the left, the bevel presses down on the inner groove of the circular slide 513 due to the action of the bevel, causing the circular slide 513 to slide downward inside the first base 511. At the same time, the long cylindrical rod 531 and the sleeve plate 532 at the top of the circular slide 513 also move downward synchronously. The left sliding plate 523 and the right sliding plate 524 also move downward synchronously under the restriction of the connecting plate 534. Under the restriction of the limiting block 525, the left sliding plate 523 and the right sliding plate 524 are also in a vertical position. The end of the right sliding plate 524 is engaged in the gear of the gear plate 45, which restricts and locks the spring sliding lock mechanism 4. When the irregular plate 512 moves towards the side closer to the driven door 1, due to the action of gravity, the inclined surface of the irregular plate 512 is in contact with the inclined surface inside the circular slide groove 513. The irregular plate 512 is restricted to a vertical position and can only move left and right. As the irregular plate 512 gradually moves to the right, the circular slide groove 513 moves upward inside the first base 511 to return to its original position. At the same time, the left sliding plate 523 and the right sliding plate 524 will also move upward synchronously under the restriction of the connecting plate 534. Under the restriction of the limiting block 525, the left sliding plate 523 and the right sliding plate 524 move upward synchronously, that is, the end of the right sliding plate 524 will be displaced upward and get away from the restriction of the gear plate 45.

[0041] The working principle of this invention: The spring-loaded sliding lock mechanism 4 is the main keyhole structure of this invention. The driven door 1 and the driving door 2 are locked together during opening and closing. When either the driving door 2 or the driven door 1 is subjected to vertical pressure, the push-pull pressing mechanism 6 is triggered to transmit the pressure to the tension clamping mechanism 5. Then, the locking device is triggered by the compression rod mechanism 53 to restrict the spring-loaded sliding lock mechanism 4. After the driving door 2 is rotated, the pin 47 contacts the latch 46. Based on the design of the inclined side, the hard spring 43 is compressed and, under the restriction of the fixing frame 44, the pin 47 is engaged in the latch 46, thus completing the locking purpose. When unlocking, the key is inserted into the lock cylinder 42. After rotation, the gear lock 41 rotates synchronously with the lock cylinder 42. Through the meshing of the gears, the lock cylinder 42 rotates. When the gear plate 45 is moved, it is compressed again to push the active door 2 to open the lock. The driven door 1 is subjected to external pressure, which pushes the push plate 61 to rotate around the rotating rod 65. The other end of the push plate 61 presses the inclined slider 67. The inclined slider 67 is pushed and moves towards the side closer to the active door 2 under the restriction of the sliding rod 68, transmitting external pressure to the tensioning and clamping mechanism 5. In the initial position, the inclined opening of the irregular plate 512 is located at the leftmost end of the inner groove of the circular groove 513. The circular groove 513 is located inside the first base 511 near the upper side. The inclined surface of the irregular plate 512 is in contact with the inclined surface inside the circular groove 513. When the straight plate 514 feels the pushing force transmitted by the push-pull clamping mechanism 6, it moves further away from the driven door 2. As one side of the movable door 1 moves, the straight plate 514 and the irregular plate 512 move synchronously to the left. The irregular plate 512 is confined to a vertical position and can only move left and right. As the irregular plate 512 gradually moves to the left, the inclined surface presses down on the inclined groove inside the circular slide groove 513, causing the circular slide groove 513 to slide downward inside the first base 511. At the same time, the long cylindrical rod 531 and the sleeve plate 532 at the top of the circular slide groove 513 also move downward synchronously. The left sliding plate 523 and the right sliding plate 524 also move downward synchronously under the restriction of the connecting plate 534. Under the restriction of the limiting block 525, the left sliding plate 523 and the right sliding plate 524 are also in a vertical position. The very end of the right sliding plate 524 is engaged with the teeth of the gear plate 45. In the wheel, the spring sliding lock mechanism 4 is restricted and locked. When the irregular plate 512 moves towards the side closer to the driven door 1, due to gravity, the inclined surface of the irregular plate 512 fits against the inclined surface inside the circular slide groove 513. The irregular plate 512 is restricted to a vertical position and can only move left and right. As the irregular plate 512 gradually moves to the right, the circular slide groove 513 moves upward inside the first base 511 to return to its original position. At the same time, the left sliding plate 523 and the right sliding plate 524 will also move upward synchronously under the restriction of the connecting plate 534. Under the restriction of the limiting block 525, the left sliding plate 523 and the right sliding plate 524 move upward synchronously. That is, the end of the right sliding plate 524 will be displaced upward and get away from the restriction of the gear plate 45.

[0042] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A side door lock device for engineering machinery, comprising a driven door (1) and an active door (2), characterized in that: The front end surface of the active door (2) is fixedly connected to a mortise lock (3), and the rear end of the active door (2) and the side corresponding to the mortise lock (3) are rotatably connected to a spring sliding lock mechanism (4). A tension clamping mechanism (5) is fixedly connected to one side of the spring sliding lock mechanism (4), and a driven door (1) is provided on the side of the spring sliding lock mechanism (4) away from the tension clamping mechanism (5). A push-pull pressing mechanism (6) is slidably connected to the bottom of the tension clamping mechanism (5) near the spring sliding lock mechanism (4). The tension clamping mechanism (5) includes a two-layer compression mechanism (52) fixedly connected to the side of the spring sliding lock mechanism (4) away from the driven door (1). The bottom of the two-layer compression mechanism (52) is fixedly connected to a first-layer tension mechanism (51). The two-layer compression mechanism (52) and the first-layer tension mechanism (51) are provided with a compression rod mechanism (53). The spring-loaded sliding lock mechanism (4) includes a large fixed plate (48) fixedly connected to the surface of the active door (2). A rigid spring (43) is fixedly connected to one side of the large fixed plate (48) near the driven door (1). A gear plate (45) is fixedly connected to the other side of the rigid spring (43). A fixing bracket (44) is provided on the outer side of the gear plate (45) and the outer surface of the active door (2). A pin (47) is fixedly connected to the other side of the gear plate (45). A latch (46) is provided on the outer surface of the driven door (1) and the outer side of the corresponding pin (47). A gear lock (41) is fixedly connected to the top position of the outer surface of the active door (2) and the corresponding gear plate (45). A lock cylinder (42) is fixedly connected to the inner center of the gear lock (41). The push-pull pressing mechanism (6) includes a base plate frame (62) fixedly connected to the outer surface of the active door (2) and the bottom of the spring sliding lock mechanism (4). A fixed base (63) is fixedly connected to the side of the base plate frame (62) away from the driven door (1). A limit plate (64) is fixedly connected to the side of the fixed base (63) close to the driven door (1). A rotating rod (65) is fixedly connected to the center of the base plate frame (62). A push plate (61) is rotatably connected to the outer side of the rotating rod (65). A pressing block (66) is rotatably connected to the end of the push plate (61) away from the driven door (1). A sliding rod (68) is slidably connected to the center of the fixed base (63). A slanted slider (67) is fixedly connected to the end of the sliding rod (68) close to the driven door (1). A connecting plate (69) is fixedly connected to the other end of the sliding rod (68). The two-layer extrusion mechanism (52) includes a second-layer base (521) fixedly connected to the side of the large fixed plate (48) away from the driven door (1) and the outer surface of the active door (2). A small fixed plate (522) is fixedly connected to the inner surface of the second-layer base (521) near the bottom. A limit block (525) is fixedly connected to the outer surface of the small fixed plate (522).

2. The side door lock device for engineering machinery according to claim 1, characterized in that: The first layer tensioning mechanism (51) includes a first layer base (511) fixedly connected to the bottom of the second layer base (521). A circular groove (513) is slidably connected inside the first layer base (511). A straight plate (514) is slidably connected inside the first layer base (511) and inside the circular groove (513). A connecting plate (69) is fixedly connected to the side of the straight plate (514) near the driven door (1).

3. A side door lock device for engineering machinery according to claim 2, characterized in that: The extrusion rod mechanism (53) includes a long cylindrical rod (531) fixedly connected to the top of the circular slide groove (513). A sleeve plate (532) is fixedly connected to the outer surface of the long cylindrical rod (531). A connecting plate (534) is fixedly connected to the outer surface of the bottom end of the sleeve plate (532). A left sliding plate (523) is provided on the outer side of the connecting plate (534) away from the driven door (1) and the corresponding limiting block (525) at its top. A right sliding plate (524) is provided on the outer side of the connecting plate (534) on the other side and the corresponding limiting block (525) at its top. A nut (533) is provided on the outer surface of the long cylindrical rod (531) and the top of the sleeve plate (532).

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