Manhole cover mechanism

Abstract

The invention discloses a manhole cover mechanism, and relates to the technical field of container accessories, the manhole cover mechanism comprises a cover opening seat and a cover plate, the cover opening seat is slidably provided with a pin lock assembly capable of being locked with the cover plate, the cover plate is in transmission connection with a power unit capable of forward and reverse driving, the cover opening seat is provided with a slide way assembly, and the slide way assembly is provided with a slide way. The sliding way assembly comprises a sliding way structure arranged on the cover opening seat, the sliding way structure is provided with a first limiting end and a second limiting end, a sliding body is arranged between the first limiting end and the second limiting end in a sliding fit mode, the sliding body is connected with the power unit, the pin lock assembly is connected with the sliding body, and the power unit is connected with the pin lock assembly. The pin lock assembly can complete switching of the locking and unlocking states along with counter-acting force generated by driving of the power units in the positive and negative directions, in the whole process, the two power units do not need to be independently controlled, operation steps are simplified, and operation simplicity and convenience are improved.

Description

Technical Field

[0001] The invention relates to the technical field of container accessories, in particular to a manhole cover mechanism. Background Art

[0002] Manhole cover is a kind of access device used in closed space, which is widely used in ships, storage tanks, industrial equipment and other fields. Its main function is to provide safe access and good sealing performance. The basic structure of the existing manhole cover mainly includes a cover seat and a cover plate. One side of the cover plate is connected to the cover seat through a hinge, and a locking member that can be locked with each other is arranged between the other side of the cover plate and the cover seat. In the unlocked state, the cover plate can be deflected by the hinge, thereby controlling the opening and closing of the manhole cover. In order to realize automatic opening, closing and locking of the cover plate of the manhole cover, the existing method is to set a driving mechanism to control the switching of unlocking and locking of the locking member, and then set another driving mechanism to control the deflection and opening and closing of the cover plate. However, the disadvantage of the existing solution is that it is necessary to control the two driving mechanisms separately and in turn, which is cumbersome and not simple enough. In order to solve the above problem, we propose a new technical solution. Summary of the invention

[0003] The object of the present invention is to provide a manhole cover mechanism to solve the above-mentioned deficiencies in the prior art.

[0004] In order to achieve the above object, the present invention provides the following technical solutions: The lock assembly is connected with the cover plate to release the locking cam, and the locking cam is connected with the locking cam to release the locking cam, so that the locking cam can be locked to the cover plate when the locking cam is in the forward and reverse directions.

[0005] Preferably, the cover seat comprises a base plate, a cover ring is fixed through the base plate, and the cover ring is adapted to be opened and closed with the cover plate.

[0006] Preferably, the power unit has a body portion and an output portion, the power unit is a telescopic cylinder, the body portion is a cylinder barrel portion of the telescopic cylinder, and the output portion is a piston rod portion of the telescopic cylinder.

[0007] Preferably, the slide structure includes side vertical plates located on both sides of the body, and the plate surface of each side vertical plate is provided with a line opening, and the two ends of the line opening respectively constitute a first limit end and a second limit end, and the sliding body is a cylindrical rod connected to the body, and the two ends of the sliding body respectively pass through the corresponding line opening.

[0008] Preferably, the pin lock assembly includes a lock tongue portion and a latch portion, the lock tongue portion is fixed to the cover plate, the latch portion is fixed to the sliding body, and when the sliding body is located at the second limiting end, the lock tongue portion and the latch portion are in a separated state.

[0009] Preferably, the locking latch portion comprises a frame plate fixed to the sliding body, a latch strip piece is fixed to the frame plate, and the latch strip piece can be snap-connected with the locking tongue portion.

[0010] Preferably, a plurality of support plates are vertically fixed on the base plate, and a long strip opening is opened on the side of each support plate for the latch part to pass through. The latch part can move synchronously with the sliding body along the length direction line of the long strip opening, thereby completing the switching of the locking state.

[0011] Preferably, the cover plate and the power unit are movably connected via a transmission assembly, and the cover plate and the cover seat are movably hinged via a hinge.

[0012] Preferably, the transmission assembly includes a support frame, one end of the support frame is movably hinged to the base plate, the other end of the support frame is movably connected to the cover plate via a rocker assembly, a shaft column is rotatably installed in the middle of the support frame, the shaft column is connected to the output part of the power unit, and the support frame can open the cover plate on the forward driving stroke of the power unit.

[0013] In the above technical scheme, a manhole cover mechanism provided by the present invention is connected to a cover seat by slidingly connecting a power unit capable of forward and reverse driving, and connecting the power unit to the cover seat through a slide assembly, thereby utilizing the change in the driving direction of the power unit to complete the switching of the cover opening and closing states, and at the same time utilizing the reaction force generated by the power unit driven in different directions to make the power unit move accordingly on the slide assembly, thereby completing the switching of the locking state of the pin lock assembly. During the whole process, there is no need to control the two power units separately, which simplifies the operation steps and improves the ease of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is an overall schematic diagram of a manhole cover mechanism of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 3 It is a schematic diagram of a latch portion of a manhole cover mechanism of the present invention; Figure 4 The present invention is a schematic diagram of a rocker assembly of a manhole cover mechanism.

[0016] Description of reference numerals: 1. Cover seat; 1.1. Base plate; 1.2. Cover ring; 2. Cover plate; 3. Power unit; 3.1. Body; 3.2. Output; 4. Slide assembly; 4.1. Slide structure; 4.11. First limit end; 4.12. Second limit end; 4.13. Side plate; 4.14. Line mouth; 4.2. Sliding body; 5. Pin lock assembly; 5.1. Lock tongue; 5.2. Latch; 5.21. Frame plate; 5.22. Latch strip; 6. Transmission assembly; 6.1. Support frame; 6.2. Rocker assembly; 6.21. Bar; 6.22. First connecting shaft; 6.23. Second connecting shaft; 6.3. Shaft column; 7. Support plate; 8. Long strip; 9. Hinge; 9.1. Support plate; 9.2. Ear plate; 9.3. Hinge shaft. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0018] See also Figure 1-Figure 4A manhole cover mechanism provided by an embodiment of the present invention comprises a cover seat 1 and a cover plate 2, a pin lock assembly 5 capable of being locked with the cover plate 2 is slidably mounted on the cover seat 1, a power unit 3 capable of being driven in both directions is transmission-connected to the cover plate 2, a slideway assembly 4 is mounted on the cover seat 1, the slideway assembly 4 comprises a slideway structure 4.1 arranged on the cover seat 1, the slideway structure 4.1 has a first limit end 4.11 and a second limit end 4.12, a sliding body 4.2 is slidably adapted between the first limit end 4.11 and the second limit end 4.12, and the sliding The body 4.2 is connected to the power unit 3, and the pin lock assembly 5 is connected to the sliding body 4.2. The power unit 3 has two driving strokes during the forward driving process. The first driving stroke: the reaction force generated by the power unit 3 causes the sliding body 4.2 to move from the first limit end 4.11 to the second limit end 4.12 to drive the pin lock assembly 5 to slide and separate from the cover plate 2 and unlock. The second driving stroke: the power unit 3 is driven forward to open the cover plate 2, and the pin lock assembly 5 can complete the switching of the locking state with the reaction force generated by the power unit 3 driving in the forward and reverse directions. Specifically, the cover seat 1 is connected and installed with the wall surface of a large container such as a tank body, and the tank body is a transport tank on a tank truck. The cover seat 1 is provided with a passageway, so that the cover seat 1 forms an inlet and outlet passage on the large container. The cover plate 2 has an open position on the cover seat 1 to keep the passageway of the cover seat 1 in normal inlet and outlet, and the cover plate 2 also has a closed position on the cover seat 1 to completely block the passageway of the cover seat 1. The pin lock assembly 5 has a locked state that can lock the cover plate 2 in the closed position, and the pin lock assembly 5 also has a separated state that releases the lock of the cover plate 2 in the closed position. The power unit 3 has two driving modes, namely, forward driving and reverse driving. The power unit 3 can provide driving force for switching the opening and closing states of the cover plate 2 and switching the locking state of the pin lock assembly 5. In actual use, for example, when the cover plate 2 is in the closed position and the pin lock assembly 5 is in the locked state, when the cover plate 2 needs to be switched to the open position, the power unit 3 is driven forward at this time. Since the output part of the power unit 3 is connected to the cover plate 2 by transmission, and the body of the power unit 3 is connected to the cover opening seat 1 through the slideway assembly 4, the initial resistance of the cover plate 2 is relatively large at the initial stage of the forward drive of the power unit 3. The resistance sources include the deadweight of the cover plate 2 and the locking of the pin lock assembly 5 in the locked state. The cover plate 2 exerts a reaction force on the forward drive of the power unit 3, so that the power unit 3 moves along the slideway assembly 4. When forward sliding occurs, the power unit 3 switches the pin lock assembly 5 from the locked state to the separated state during the forward sliding process. When the power unit 3 slides forward to the end of the slide assembly 4, the slide assembly 4 limits the forward sliding of the power unit 3. At this time, the pin lock assembly 5 is in the separated state, and the power unit 3 continues to drive forward. After the driving force of the power unit 3 overcomes the resistance of the cover plate 2 itself, the cover plate 2 is switched from the closed position to the open position. Similarly, when it is necessary to restore the cover plate 2 from the open position to the closed position, the pin lock assembly 5 is restored from the separated state to the locked state, and the power unit 3 can be driven in the reverse direction.

[0019] In another embodiment provided by the present invention, the cover seat 1 includes a base plate 1.1, the plate body of the base plate 1.1 is adapted and fixed to the corresponding container wall surface, a cover ring 1.2 is fixed through the upper part of the base plate 1.1, and the cover ring 1.2 forms a channel opening on the container wall surface that communicates with the inside and outside, and the cover ring 1.2 is adapted to be opened and closed with the cover plate 2, that is, the cover plate 2 has a closed position to completely block the cover ring 1.2, and the cover plate 2 has an open position to keep the cover ring 1.2 completely open; Furthermore, the cover plate 2 and the power unit 3 are movably connected via a transmission assembly 6, and the cover plate 2 and the cover seat 1 are movably hinged via a hinge 9, the hinge 9 comprises a support plate 9.1 vertically fixed to the base plate 1.1, and ear plates 9.2 fixed to the cover plate 2 are arranged parallel to each other on both sides of the support plate 9.1, and a hinge shaft 9.3 fixed to the ear plate 9.2 is movably penetrated on the support plate 9.1, and the cover plate 2 rotates around the hinge shaft 9.3 when switching back and forth between the closed position and the open position; It should be noted that, in the deflection stroke between the closed position and the open position, the cover plate 2 has a vertical position perpendicular to the ring surface, the area between the vertical position and the closed position is an acute angle area, and the area between the vertical position and the open position is an obtuse angle area, with the ring surface of the cover ring 1.2 as the starting surface. The power unit 3 comprises a body part 3.1 and an output part 3.2, wherein the body part 3.1 is connected to the slideway assembly 4, and the output part 3.2 of the power unit 3 is connected to the cover plate 2 via a transmission assembly 6. Furthermore, the power unit 3 is a telescopic cylinder, the body part 3.1 is the cylinder barrel part of the telescopic cylinder, and the output part 3.2 is the piston rod part of the telescopic cylinder. The telescopic cylinder can be a reciprocating drive power device such as a pneumatic cylinder, a hydraulic telescopic cylinder or a reciprocating straight rod motor; During actual use, when the power unit 3 is driven in the forward direction, the output part 3.2 of the power unit 3 extends out from the body part 3.1, and the output part 3.2 provides a driving force for the cover plate 2 to deflect toward the open position during the extension process. When the power unit 3 is driven in the reverse direction, the output part 3.2 of the power unit 3 is retracted into the body part 3.1, and the output part 3.2 provides a driving force for the cover plate 2 to deflect toward the closed position during the retraction process.

[0020] In another embodiment provided by the present invention, the transmission assembly 6 includes a support frame 6.1, one end of the support frame 6.1 is movably hinged to the base plate 1.1, the track surface generated by the swing of the support frame 6.1 on the base plate 1.1 is parallel to the track surface generated by the swing of the cover plate 2 around the hinge 9, and the other end of the support frame 6.1 is movably connected to the cover plate 2 through a rocker assembly 6.2; The rocker assembly 6.2 comprises a bar 6.21, one end of which is rotatably connected to a first connecting shaft 6.22, the first connecting shaft 6.22 is rotatably connected to the end of the support frame 6.1, the other end of the bar 6.21 is rotatably connected to a second connecting shaft 6.23, the second connecting shaft 6.23 is fixed to the cover plate 2, and the track surface generated by the bar 6.21 during the deflection process is parallel to the track surface generated by the swing of the support frame 6.1 on the base plate 1.1; A shaft column 6.3 is rotatably installed in the middle of the support frame 6.1, and the shaft column 6.3 is connected to the output part 3.2 of the power unit 3. The support frame 6.1 can open the cover 2 on the forward driving stroke of the power unit 3, that is, switch the cover 2 to the open position. The support frame 6.1 can close the cover 2 on the reverse driving stroke of the power unit 3, that is, switch the cover 2 to the closed position. The axial center lines of the first connecting shaft 6.22, the second connecting shaft 6.23 and the shaft column 6.3 are parallel to each other.

[0021] When the cover plate 2 is in the closed position, the angle between the length direction line of the bar 6.21 and the length direction line of the support frame 6.1 is in a first angle state, and when the cover plate 2 is in the open position, the angle between the length direction line of the bar 6.21 and the length direction line of the support frame 6.1 is in a second angle state, and the angle in the first angle state is smaller than the angle in the second angle state; In actual use, when the transmission assembly 6 receives the positive drive of the power unit 3, specifically, the support frame 6.1 is positively deflected around the hinge point on the base plate 1.1, and the support frame 6.1 is in sliding contact with the second connecting shaft 6.23 during the positive deflection, thereby providing a driving force for the cover plate 2 to deflect in the direction of the open position. When the deflection of the cover plate 2 enters the obtuse angle area, the cover plate 2 can be deflected toward the open position autonomously due to its own gravity. At this time, the support frame 6.1 is separated from the second connecting shaft 6.23, and the support frame 6.1 is connected to the second connecting shaft 6.23 through the bar 6.21 and the first connecting shaft 6.22 until the cover plate 2 reaches the open position; When the transmission assembly 6 receives the reverse drive of the power unit 3, specifically, the output part 3.2 of the power unit 3 generates a pulling force on the support frame 6.1 through the shaft column 6.3, so that the support frame 6.1 deflects in the reverse direction around the hinge point on the base plate 1.1, and at the same time, the support frame 6.1 provides a driving force for the cover plate 2 to deflect toward the closed position through the rocker assembly 6.2. When the cover plate 2 deflects into the acute angle area, the cover plate 2 can deflect toward the closed position autonomously due to its own gravity until the cover plate 2 reaches the closed position; That is to say, during the process of the cover plate 2 being deflected from the closed position to the open position, the power unit 3 provides a pushing driving force for the cover plate 2 deflected in the acute angle area through the transmission assembly 6; during the process of the cover plate 2 being deflected from the open position to the closed position, the power unit 3 provides a pulling driving force for the cover plate 2 deflected in the obtuse angle area through the transmission assembly 6, thereby enabling the cover plate 2 to reciprocate between the closed position and the open position.

[0022] In another embodiment provided by the present invention, the slide assembly 4 includes a slide structure 4.1 disposed on the base plate 1.1, the slide structure 4.1 having a first limit end 4.11 and a second limit end 4.12, a sliding body 4.2 is slidably adapted between the first limit end 4.11 and the second limit end 4.12, the sliding body 4.2 is connected to the power unit 3, and the reaction force generated during the forward driving process of the power unit 3 causes the sliding body 4.2 to move from the first limit end 4.11 to the second limit end 4.12; Specifically, the slide structure 4.1 includes side upright plates 4.13 located on both sides of the body portion 3.1, the plate surfaces of the two side upright plates 4.13 are parallel to each other, a straight slideway is formed between the plate surfaces of the two side upright plates 4.13, the plate surfaces of the two side upright plates 4.13 are both vertically fixed to the base plate 1.1, and the length direction lines of the two side upright plates 4.13 are parallel to the extension direction line of the output portion 3.2 of the power unit 3, The plate surface of each side vertical plate 4.13 is provided with a line opening 4.14, and the line openings 4.14 on the two side vertical plates 4.13 are on the same horizontal plane. The length direction line of the line opening 4.14 is parallel to the length direction line of the side vertical plate 4.13, and the two ends of the line opening 4.14 respectively constitute a first limit end 4.11 and a second limit end 4.12, and the sliding body 4.2 is a cylindrical rod connected to the body part 3.1, and the side of the cylindrical rod is fixed to the body part 3.1 of the power unit 3, and the two ends of the sliding body 4.2 respectively pass through the corresponding line opening 4.14, and a limit block for limiting the axial movement of the sliding body 4.2 is fixed on the cylindrical rod to ensure that the moving direction line of the cylindrical rod is always perpendicular to the axis of the cylindrical rod; The latch 5.2 is in a locked state and in a disengaged state, and the latch 5.2 is in a locked state and in a disengaged state, and the cover 2 is in a closed position, and the latch 5.2 is in contact with the upper part of the latch 5.1, thereby limiting the deflection of the cover 2 toward the open position, and when the latch 5.1 is in a disengaged state, the latch 5.2 is disengaged from the latch 5.1, and the latch 5.2 is located in an area outside the deflection trajectory of the latch 5.1 and the cover 2, thereby ensuring that the cover 2 can normally switch back and forth between the closed position and the open position; In actual use, when the sliding body 4.2 is located at the second limit end 4.12, the locking tongue portion 5.1 and the locking latch portion 5.2 are in a separated state, and when the sliding body 4.2 is located at the first limit end 4.11, the locking tongue portion 5.1 and the locking latch portion 5.2 are in a locked state.

[0023] Specifically, when the cover plate 2 needs to be switched from the closed position to the open position, when the power unit 3 has not yet started, the cover plate 2 is still in the closed position, the sliding body 4.2 is located at the first limit end 4.11, the lock tongue portion 5.1 and the latch portion 5.2 are in a locked state, and when the power unit 3 is driven forward, the output portion 3.2 of the power unit 3 extends from the body portion 3.1, thereby receiving the reaction force of the cover plate 2, and at this time the body portion 3.1 of the power unit 3 is moved from the first limit end 4.1 through the sliding body 4.2. 1 slides forwardly toward the position of the second limit end 4.12. When the sliding body 4.2 reaches the position of the second limit end 4.12, the second limit end 4.12 blocks the sliding body 4.2, so that the sliding body 4.2 stops sliding forwardly. At the same time, the latch part 5.2 is switched from the locked state to the separated state along with the sliding body 4.2, and then continues to be driven forwardly along with the output part 3.2. At this time, the transmission assembly 6 can receive the forward drive of the power unit 3 to deflect the cover plate 2 toward the open position. Similarly, when the cover plate 2 needs to be switched from the open position to the closed position, the output portion 3.2 of the power unit 3 is retracted into the body portion 3.1. At this time, the body portion 3.1 of the power unit 3 slides in the reverse direction from the second limit end 4.12 to the first limit end 4.11 through the sliding body 4.2. When the sliding body 4.2 reaches the position of the first limit end 4.11, the first limit end 4.11 blocks the sliding body 4.2, so that the sliding body 4.2 stops sliding in the reverse direction. It should be noted that, when the cover plate 2 deflects into the acute angle area, the cover plate 2 can deflect toward the closed position under the action of its own gravity. At this time, the deflection speed of the cover plate 2 is greater than the speed at which the output portion 3.2 of the power unit 3 retracts into the body portion 3.1. During the deflection of the cover plate 2 toward the closed position, a downward pressure is applied to the power unit 3, and the component force generated by the downward pressure causes the body portion 3.1 to slide forward from the first limit end 4.11 to the second limit end 4.12 through the sliding body 4.2, so that the lock tongue portion 5.1 and the latch portion 5.2 are still in a separated state. When the cover 2 reaches the closed position, the output portion 3.2 of the power unit 3 continues to retract into the body portion 3.1, and the body portion 3.1 of the power unit 3 slides in the opposite direction from the second limit end 4.12 to the first limit end 4.11 through the sliding body 4.2. When the sliding body 4.2 reaches the first limit end 4.11, the lock tongue portion 5.1 and the latch portion 5.2 are in a locked state, thereby locking the cover 2 in the closed position.

[0024] In another embodiment provided by the present invention, the latch portion 5.2 includes a frame plate 5.21 fixed to the sliding body 4.2, the plate surface of the frame plate 5.21 is parallel to the horizontal plane, a latch strip 5.22 is fixed to the frame plate 5.21, the latch strip 5.22 and the frame plate 5.21 are on the same plane, the latch strip 5.22 is an L-shaped structure, the latch strip 5.22 has a straight strip portion parallel to the length direction line of the frame plate 5.21, and the latch strip 5.22 can be clamped with the lock tongue portion 5.1; Further, a plurality of support plates 7 are vertically fixed on the base plate 1.1, and a long strip opening 8 for the latch portion 5.2 to pass through is opened on the side of each support plate 7, and the length direction line of the long strip opening 8 is parallel to the length direction line of the line opening 4.14, and the latch portion 5.2 can move synchronously with the sliding body 4.2 along the length direction line of the long strip opening 8, thereby completing the switching of the locking state; In actual use, the frame plate 5.21 is connected to the sliding body 4.2, and the frame plate 5.21 can drive the latch strip 5.22 to move synchronously with the sliding body 4.2. The support plate 7 limits the frame plate 5.21 in a direction perpendicular to the base plate 1.1 through the long strip opening 8, thereby improving the stability of the lock tongue portion 5.1 and the latch portion 5.2 when they are in a locked state.

[0025] In another embodiment provided by the present invention, the driving power unit 3, the slide assembly 4 and the transmission assembly 6 constitute a driving assembly, and the driving assembly has two groups. The two groups of driving assemblies are respectively located on both sides of the cover plate 2, and the two ends of the frame plate 5.21 of the pin lock assembly 5 are connected to the corresponding slide assembly 4.

[0026] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A manhole cover mechanism, comprising a cover seat (1) and a cover plate (2), characterized in that: The cover seat (1) is slidably mounted with a pin lock assembly (5) capable of being locked with the cover plate (2); the cover plate (2) is drivingly connected with a power unit (3) capable of being driven in forward and reverse directions; the cover seat (1) is mounted with a slide assembly (4); the slide assembly (4) comprises a slide structure (4.1) arranged on the cover seat (1); the slide structure (4.1) has a first limit end (4.11) and a second limit end (4.12); a sliding body (4.2) is slidably adapted between the first limit end (4.11) and the second limit end (4.12); the sliding body (4.2) is slidably adapted with the power unit ( 3), the pin lock assembly (5) is connected to the sliding body (4.2), and the power unit (3) has two driving strokes during forward driving. The first driving stroke is: the reaction force generated by the power unit (3) causes the sliding body (4.2) to move from the first limit end (4.11) to the second limit end (4.12) to drive the pin lock assembly (5) to slide and separate from the cover plate (2) to unlock; the second driving stroke is: the power unit (3) is driven forward to open the cover plate (2), and the pin lock assembly (5) can complete the switching of the locking state with the reaction force generated by the power unit (3) in the forward and reverse directions.

2. A manhole cover mechanism according to claim 1, characterized in that: The cover seat (1) comprises a base plate (1.1), a cover ring (1.2) is fixedly passed through the upper portion of the base plate (1.1), and the cover ring (1.2) is adapted to be opened and closed with the cover plate (2).

3. A manhole cover mechanism according to claim 2, characterized in that: The power unit (3) comprises a body part (3.1) and an output part (3.2); the power unit (3) is a telescopic cylinder, the body part (3.1) is the cylinder barrel part of the telescopic cylinder, and the output part (3.2) is the piston rod part of the telescopic cylinder.

4. A manhole cover mechanism according to claim 3, characterized in that: The slideway structure (4.1) comprises side upright plates (4.13) located on both sides of the machine body (3.1), and the plate surface of each side upright plate (4.13) is provided with a line opening (4.14), and the two ends of the line opening (4.14) respectively constitute a first limit end (4.11) and a second limit end (4.12), and the sliding body (4.2) is a cylindrical rod connected to the machine body (3.1), and the two ends of the sliding body (4.2) respectively penetrate the corresponding line opening (4.14).

5. A manhole cover mechanism according to claim 4, characterized in that: The pin lock assembly (5) comprises a lock tongue portion (5.1) and a latch portion (5.2); the lock tongue portion (5.1) is fixed to the cover plate (2); the latch portion (5.2) is fixed to the sliding body (4.2); when the sliding body (4.2) is located at the second limiting end (4.12), the lock tongue portion (5.1) and the latch portion (5.2) are in a separated state.

6. A manhole cover mechanism according to claim 5, characterized in that: The locking latch portion (5.2) comprises a frame plate (5.21) fixed to the sliding body (4.2), a latch strip (5.22) being fixed to the frame plate (5.21), and the latch strip (5.22) being capable of being snap-connected with the locking tongue portion (5.1).

7. A manhole cover mechanism according to claim 6, characterized in that: A plurality of support plates (7) are vertically fixed on the base plate (1.1), and a long strip opening (8) for a locking latch (5.2) to pass through is provided on the side surface of each support plate (7). The locking latch (5.2) can move synchronously with the sliding body (4.2) along the length direction line of the long strip opening (8), thereby completing the switching of the locking state.

8. A manhole cover mechanism according to claim 3, characterized in that: The cover plate (2) and the power unit (3) are movably connected via a transmission assembly (6), and the cover plate (2) and the cover seat (1) are movably hinged via a hinge (9).

9. A manhole cover mechanism according to claim 8, characterized in that: The transmission assembly (6) comprises a support frame (6.1), one end of the support frame (6.1) is movably hinged to the base plate (1.1), the other end of the support frame (6.1) is movably connected to the cover plate (2) via a rocker assembly (6.2), a shaft column (6.3) is rotatably mounted in the middle of the support frame (6.1), the shaft column (6.3) is connected to the output part (3.2) of the power unit (3), and the support frame (6.1) can open the cover plate (2) in the forward driving stroke of the power unit (3).

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