Multi-stage automatic locking and unlocking device and method for arc-shaped working door

Abstract

The invention provides an arc-shaped working door multistage automatic locking and unlocking device and method.The device comprises an arc-shaped working door locking mechanism and an elastic stop lever mechanism, the arc-shaped working door locking mechanism is used for locking an arc-shaped working door at the corresponding position, and the arc-shaped working door locking mechanism comprises a gate pier locking base, a hanging piece, a lifting lug hanging rod, a locking shaft and a hanging piece driving mechanism; the gate pier locking seat is fixed on the gate pier, the locking shaft is installed inside the gate pier locking seat, the upper portion of the hanging piece is of an annular structure and is arranged on the locking shaft in a sleeved mode, and a lifting hook structure connected with the lifting lug hanging rod in a hooked mode is arranged below the annular structure of the hanging piece. The elastic stop lever mechanism is used for driving the hanging piece driving mechanism when moving up and down along with the arc-shaped working door, and the hanging piece driving mechanism drives the hanging piece to move in the axial direction of the locking shaft. When the arc-shaped working door discharges flood or is overhauled, the arc-shaped working door can be opened and closed to different heights and automatically locked at the corresponding position according to different task requirements, and dependence on a hydraulic hoist or a fixed winch is reduced.

Description

Technical Field

[0001] The invention relates to the field of curved working doors in water conservancy and hydropower engineering, and in particular to a multi-stage automatic locking and unlocking device and method for a curved working door. Background Art

[0002] In the water conservancy, hydropower and water transport engineering industries, arc-shaped working gates are widely used as working gates in discharge buildings due to their simple structure, small opening and closing force, easy operation and good water flow conditions. Arc-shaped working gates are generally operated by hydraulic opening and closing machines or fixed winches.

[0003] When in working conditions such as flood discharge or flow regulation, the arc working door maintains different openings (partial opening or full opening). To maintain different openings, it must rely on hydraulic hoists or fixed winches to keep the working state. When maintaining and repairing the arc working door, the hydraulic hoist or fixed winch is used to lift the arc working door to the top of the opening for locking. Generally, a locking hole is set on the side column of the arc working door, and a pin is used for manual locking. The setting of the locking hole is limited by the structure of the arc working door, and usually only one locking position is set.

[0004] The existing arc working door locking device usually has only one maintenance lock position and no working state locking position. There are four defects: (1) Manual operation locking is inconvenient; (2) There are few locking positions, which makes it inconvenient to repair the arc working door. For example, when repairing the upper half of the arc working door, in order to prevent the upper half of the arc working door from protruding too much beyond the opening, the locking position should be in the upper half of the arc working door; when repairing the lower half of the arc working door, the lower half should protrude above the opening, and the locking position should be in the lower half of the arc working door. (3) There are no locking positions for different working states. The hydraulic gate hoist or fixed winch continues to bear the load, which may cause the entire machine body to shake in severe cases, posing a major safety hazard. (4) When the arc working door is in working condition, the hydraulic gate hoist or fixed winch cannot be repaired.

[0005] Based on the above problems, it is necessary to provide an automatic locking and unlocking device and method for a curved working door that can be adapted to different opening requirements. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a multi-stage automatic locking and unlocking device and method for an arc-shaped working door, which can open and close the arc-shaped working door to different heights and automatically lock it at the corresponding position according to different task requirements when the arc-shaped working door is discharging flood or overhauling, thereby reducing the dependence on the hydraulic hoist or fixed winch, forming a double insurance, extending the service life of the hydraulic hoist or fixed winch, and automatically unlocking after completing the relevant tasks. The whole process reduces manual operation and realizes process automation.

[0007] The present invention adopts the following technical solutions to solve the above technical problems:

[0008] A multi-stage automatic locking and unlocking device for an arc-shaped working door, comprising: an arc-shaped working door locking mechanism and an elastic blocking rod mechanism for locking the arc-shaped working door in a corresponding position, wherein the arc-shaped working door locking mechanism comprises a gate pier locking seat, a hanger, a hanging ear hanging rod, a locking shaft, and a hanger driving mechanism, wherein the gate pier locking seat is fixed on the gate pier, and the locking shaft is installed inside the gate pier locking seat, and the upper part of the hanger is an annular structure, which is sleeved on the locking shaft and can move axially along the locking shaft, and the lower part of the hanger annular structure is a hook structure hooked with the hanging ear hanging rod; the hanging ear hanging rod and the elastic blocking rod mechanism are fixed at multiple positions on the panel of the arc-shaped working door to form multiple locking positions, and the elastic blocking rod mechanism is used to drive the hanger driving mechanism as the arc-shaped working door moves up and down, and the hanger driving mechanism drives the hanger to move axially along the locking shaft, so that the hanger moves to the hanging ear hanging rod and is locked with the hanging ear hanging rod through the hook structure on the hanger, or the hanger is removed from the hanging ear hanging rod to achieve unlocking.

[0009] Furthermore, the hanger driving mechanism includes a Y-shaped connecting rod, an L-shaped crank, a connecting rod slider articulation shaft, a crank-connecting rod articulation shaft, and a crank articulation shaft. One end of the Y-shaped connecting rod is articulated to the hanger through the connecting rod slider articulation shaft, and the other end is articulated to the L-shaped crank through the crank-connecting rod articulation shaft. The inflection point of the L-shaped crank is connected to the gate pier locking seat through the crank articulation shaft; the gate pier locking seat includes a concave groove having a first end face and a second end face, and the L-shaped crank rotates with its inflection point as the center of the circle, driving the Y-shaped connecting rod to move in space, and the hanger moves axially on the locking shaft accordingly, that is, the movable range of the hanger is between the first end face and the second end face; the elastic baffle mechanism drives the L-shaped crank to rotate as the arc-shaped working door runs.

[0010] Furthermore, the elastic blocking rod mechanism includes a blocking rod, a U-shaped limiting member, and a spring. The U-shaped limiting member is fixed on the panel of the arc-shaped working door. One end of the spring is connected to the U-shaped limiting member, and the other end is connected to the blocking rod.

[0011] Furthermore, in the initial state, the spring is in a free state, and a part of the baffle rod is in the U-shaped limit piece. When the baffle rod is squeezed by external force, the spring contracts under the force, and the baffle rod moves in the U-shaped limit piece; when there is no external force acting on the baffle rod, the spring recovers and the baffle rod returns to its initial position; the baffle rod of the elastic baffle rod mechanism comes into contact with the L-shaped crank as the arc-shaped working door moves.

[0012] Furthermore, when the arc-shaped working gate is in the water retaining working state, the bottom is in contact with the flow channel and the two sides are in contact with the gate piers to form a closed space.

[0013] Furthermore, an arm hinge support is provided behind the arc working door. When the arc working door is discharging flood or overhauling, the arc working door is rotated around the arm hinge support through the operation of the hydraulic opening and closing machine or the fixed winch. When the arc working door is rotated to an appropriate height, the arc working door is locked in the corresponding position by the arc working door locking mechanism.

[0014] A multi-stage automatic locking and unlocking method for a curved working door is implemented using the above device, and the method comprises the following steps:

[0015] When the arc-shaped working door locking mechanism is in the initial state, the side surface of the hanging part is in contact with the first end surface of the gate pier locking seat and is in the left limit position, and the L-shaped crank is in the upper limit position;

[0016] The arc-shaped working door moves upward, and the hanging ear and the elastic blocking rod mechanism fixed on the arc-shaped working door move accordingly, and the blocking rod of the elastic blocking rod mechanism contacts the L-shaped crank and passes the upper limit position;

[0017] The arc working door starts to move downward, and the blocking rod contacts the L-shaped crank. As the arc working door rotates, the L-shaped crank rotates with the turning point as the center under the extrusion force of the blocking rod, and the Y-shaped connecting rod also moves accordingly, driving the hanging part to move axially on the locking shaft until the hanging part fits with the second end face of the gate pier locking seat and reaches the right limit position. At this time, the L-shaped crank is at the lower limit position, and the blocking rod compresses the spring and passes the lower limit position;

[0018] The arc working door continues to move downward until the hanging ear and the hook structure of the hanging part are completely in contact to complete the automatic locking function. The arc working door is locked by the arc working door locking mechanism, and the hydraulic hoist or fixed winch exits the working state;

[0019] When the inspection is completed or the gate needs to be closed, the arc working door first moves upward under the action of the hydraulic hoist or fixed winch, the L-shaped crank rotates under the drive of the stop rod, and the Y-shaped connecting rod moves accordingly, driving the hanger to move axially on the locking shaft until the hanger fits with the first end face of the gate pier locking seat and reaches the left limit position. It will not affect the movement of the lifting ear and hanging rod, and the locking mechanism of the arc working door returns to the initial state, and the arc working door continues to move downward to complete the automatic unlocking function.

[0020] Compared with the prior art, the present invention adopts the above technical solution and has the following effects:

[0021] (1) According to different opening requirements such as flow regulation, the curved working door is opened and closed to different heights by a hydraulic hoist or a fixed winch, and automatically locked at the corresponding position, realizing the self-locking function in various opening states;

[0022] (2) When the arc-shaped working door is partially opened and locked, the hydraulic hoist or fixed winch can be switched to a non-working state, thereby reducing the load on the hydraulic hoist or fixed winch and effectively extending its service life;

[0023] (3) The curved working door can be locked at multiple openings. After locking, the hydraulic hoist or fixed winch can be inspected at any time, which is convenient for operation;

[0024] (4) The curved working door can be automatically locked and automatically unlocked after completing relevant functional requirements. The process is automated and does not require manual operation or additional tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the water-blocking state of the curved working door according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of a partially opened state of an arc-shaped working door according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the maintenance state of the curved working door according to an embodiment of the present invention;

[0028] Figure 4 for Figure 3 The enlarged three-dimensional view of part A in the middle;

[0029] Figure 5 for Figure 4 Partial cross-section of middle II;

[0030] Figure 6 for Figure 5 A front view of

[0031] Figure 7 for Figure 6 Cross-sectional view of part B;

[0032] Figure 8 for Figure 7 Partial section view of section II-II;

[0033] Fig. 9 It is a schematic diagram of the operating principle of the locking mechanism;

[0034] Fig.10 for Fig. 9 Three-dimensional schematic diagram of the middle c position;

[0035] Fig.11 for Fig.10 A front view of

[0036] Fig.12 for Fig. 9 Three-dimensional schematic diagram of the middle d position;

[0037] Fig.13 for Fig.12 A front view of

[0038] Fig.14 for Fig. 9 Three-dimensional schematic diagram of position b in the middle;

[0039] Fig.15 for Fig.14 A front view of

[0040] Fig.16 It is a three-dimensional schematic diagram of the locked state of the arc-shaped working door according to an embodiment of the present invention;

[0041] Fig.17 for Fig.16 A front view of

[0042] Fig.18 for Fig. 9 Three-dimensional schematic diagram of position a in the middle;

[0043] Fig.19 for Fig.18 A front view of

[0044] Fig. 20 for Fig. 9 Three-dimensional schematic diagram of the middle c position;

[0045] Fig.21 for Fig. 20 A front view of

[0046] Fig. 22 This is a schematic diagram of the unlocked state of the curved working door according to an embodiment of the present invention;

[0047] Fig.23 This is a schematic diagram of the assembly of the locking mechanism of the arc-shaped working door according to an embodiment of the present invention;

[0048] Fig.24 The figure is a schematic diagram of the arrangement of the hanging ear and hanging rod and the elastic blocking rod mechanism on the curved working door panel according to an embodiment of the present invention.

[0049] In the figure: 1—flow channel, 2—gate pier, 3—arc-shaped working door, 3.1—arc-shaped working door panel, 4—support arm hinge support, 5—arc-shaped working door locking mechanism, 5.1—gate pier locking seat, 5.2—hanging part, 5.3—Y-shaped connecting rod, 5.4—L-shaped crank, 5.5—connecting rod slider hinge shaft, 5.6—crank connecting rod hinge shaft, 5.7—crank hinge shaft, 5.8—hanging ear hanging rod, 5.9—locking shaft, 6—elastic blocking rod mechanism, 6.1—blocking rod, 6.2—U-shaped limiting member, 6.3—spring. DETAILED DESCRIPTION

[0050] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings, but the scope of protection claimed is not limited to the description.

[0051] See also Figures 1 to 4 An embodiment of the present invention provides a multi-stage automatic locking and unlocking device for an arc-shaped working door, including a flow channel 1, a gate pier 2, an arc-shaped working door 3, an arm hinge support 4, an arc-shaped working door locking mechanism 5 and an elastic blocking rod mechanism 6.

[0052] like Figure 1 As shown, the effect of blocking water flow is achieved. Under the impact of huge water flow pressure, the gate is subjected to large radial force. A support arm hinge support 4 is set behind the arc working door 3 to support the force of the arc working door 3 in this direction. When the arc working door 3 is discharging flood or overhauling, the arc working door 3 rotates around the support arm hinge support 4 through the operation of the hydraulic hoist or fixed winch to a suitable height, and the arc working door locking mechanism 5 locks the arc working door 3 in the corresponding position, as shown in FIG. Figure 2 , Figure 3 shown.

[0053] like Figure 4 , Figure 5 , Figure 6 As shown, the arc working door locking mechanism 5 includes a gate pier locking seat 5.1, a hanging part 5.2, a Y-shaped connecting rod 5.3, an L-shaped crank 5.4, a connecting rod slider hinge shaft 5.5, a crank connecting rod hinge shaft 5.6, a crank hinge shaft 5.7, a lifting ear hanging rod 5.8, and a locking shaft 5.9. The elastic blocking rod mechanism 6 includes a blocking rod 6.1, a U-shaped limiting member 6.2, and a spring 6.3. The lifting ear hanging rod 5.8 and the elastic blocking rod mechanism 6 are fixed on the panel of the arc working door 3.

[0054] like Figure 7 , Figure 8 As shown, the U-shaped stopper 6.2 is fixed on the panel of the arc-shaped working door 3, one end of the spring 6.3 is connected to the U-shaped stopper 6.2, and the other end is connected to the stopper 6.1. In the initial state, the spring 6.3 is in a free state, and a part of the stopper 6.1 is in the U-shaped stopper 6.2. When the stopper 6.1 is squeezed by an external force, the spring 6.3 is forced to shrink, and the stopper 6.1 moves in the U-shaped stopper 6.2. When there is no external force acting on the stopper 6.1, the spring 6.3 recovers, and the stopper 6.1 returns to its initial position.

[0055] The gate pier locking seat 5.1 is fixed to the gate pier 2 by bolts, the locking shaft 5.9 is installed inside the gate pier locking seat 5.1, and the end face is fixed by an end cover and bolts. The upper part of the hanger 5.2 is an annular structure, which is sleeved on the locking shaft 5.9 and can move axially along the locking shaft 5.9. The lower part of the annular structure of the hanger 5.2 is a hook structure hooked with the hanging ear and hanging rod 5.8. One end of the Y-shaped connecting rod 5.3 is hinged to the hanger 5.2 through the connecting rod slider hinge shaft 5.5, and the other end is hinged to the L-shaped crank 5.4 through the crank connecting rod hinge shaft 5.6. The inflection point O of the L-shaped crank 5.4 is connected to the gate pier locking seat 5.1 through the crank hinge shaft 5.7.

[0056] like Fig. 9 As shown, the concave groove structure of the pier locking seat 5.1 has two end faces A and B. The L-shaped crank 5.4 rotates with its inflection point O as the center of the circle, driving the Y-shaped connecting rod 5.3 to move in the space, and the hanging part 5.2 moves axially on the locking shaft 5.9 accordingly, that is, the movable range of the hanging part 5.2 is between the two end faces A and B. The operating range is shown by the solid line and the dotted line in the figure. In these two states, there are four key positions a, b, c, and d.

[0057] The initial state of the arc working door locking mechanism 5 is as follows Fig. 9 As shown by the solid line in the middle, the side of the hanging member 5.2 is in contact with the A surface. As the arc-shaped working door 3 moves upward, the hanging ear and hanging rod 5.8 and the elastic blocking rod mechanism 6 fixed on the arc-shaped working door 3 are operated accordingly. Fig. 9 At point c, the stopper 6.1 comes into contact with the L-shaped crank 5.4. Fig.10 , Fig.11 As shown, at this time, the hanging part 5.2 is attached to one end face A of the gate pier locking seat 5.1, reaching the left limit position, and the L-shaped crank 5.4 is at the upper limit position. As the arc-shaped working door 3 continues to move upward, the blocking rod 6.1 is squeezed by the L-shaped crank 5.4, the spring 6.3 contracts, and the blocking rod 6.1 passes through the position of point C. After passing this position, the blocking rod 6.1 returns to the normal position under the action of the spring 6.3. At this time, the elastic blocking rod mechanism 6 is in Fig. 9 At point d, the arc-shaped working door 3 starts to move downward, and the stopper 6.1 contacts the L-shaped crank 5.4. Fig.12 , Fig.13 As shown, as the arc-shaped working door 3 rotates, the L-shaped crank 5.4 rotates around the inflection point O under the extrusion force of the blocking rod 6.1, and the Y-shaped connecting rod 5.3 also moves, driving the hanging part 5.2 to move axially on the locking shaft 5.9 (from A to B). Fig. 9 When the middle point b is located, Fig.14 , Fig.15As shown, the other end face of the hanging piece 5.2 is in contact with one end face B of the gate pier locking seat 5.1, reaching the right limit position, and the L-shaped crank 5.4 is in the lower limit position. The stop rod 6.1 compresses the spring 6.3, and the arc working door 3 continues to move downward through this point until the hanging ear hanging rod 5.8 is completely in contact with the hook structure of the hanging piece 5.2, as shown in FIG. Fig.16 , Fig.17 The arc working door 3 is locked by the arc working door locking mechanism 5, and the hydraulic hoist or fixed winch is out of working state, which can effectively extend its service life and improve the safety of the whole system.

[0058] When the inspection is completed or the gate needs to be closed, the arc working door 3 first moves upward under the action of the hydraulic hoist or fixed winch. Fig.18 , Fig.19 In the direction indicated by the middle arrow, the L-shaped crank 5.4 rotates under the drive of the blocking rod 6.1, and the Y-shaped connecting rod 5.3 moves accordingly, driving the hanging part 5.2 to move axially on the locking shaft 5.9 (from B to A). Fig. 9 When the middle point c is located, Fig. 20 , Fig.21 As shown, the hanging piece 5.2 is attached to one end face A of the gate pier locking seat 5.1, and reaches the left limit position, which will not affect the movement of the hanging ear and hanging rod 5.8, and the arc working door locking mechanism 5 returns to the initial state. The arc working door 3 continues to move downward, as shown in FIG. Fig. 22 , Fig.23 As shown, the automatic unlocking function is completed.

[0059] like Fig.24 As shown, the hanging ear rod 5.8 and the elastic blocking rod mechanism 6 are arranged at multiple positions on the curved working door panel 3.1, that is, there are multiple locking positions. The curved working door 3 can be rotated to different heights and locked according to actual needs, realizing the function of multi-position locking.

[0060] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A multi-stage automatic locking and unlocking device for a curved working door, characterized in that: include: The arc working door locking mechanism and the elastic stop rod mechanism are used to lock the arc working door in the corresponding position. The arc working door locking mechanism includes a gate pier locking seat, a hanger, a hanging ear hanging rod, a locking shaft, and a hanger driving mechanism. The gate pier locking seat is fixed on the gate pier, and the locking shaft is installed inside the gate pier locking seat. The upper part of the hanger is an annular structure, which is sleeved on the locking shaft and can move axially along the locking shaft. Below the annular structure of the hanger is a hook structure hooked with the hanging ear hanging rod; the hanging ear hanging rod and the elastic stop rod mechanism are fixed at multiple positions on the panel of the arc working door to form multiple locking positions, and the elastic stop rod mechanism is used to drive the hanger driving mechanism as the arc working door moves up and down, and the hanger driving mechanism drives the hanger to move axially along the locking shaft, so that the hanger moves to the hanging ear hanging rod and is locked with the hanging ear hanging rod through the hook structure on the hanger, or the hanger is removed from the hanging ear hanging rod to achieve unlocking.

2. The multi-stage automatic locking and unlocking device for a curved working door according to claim 1, characterized in that: The hanger driving mechanism includes a Y-shaped connecting rod, an L-shaped crank, a connecting rod slider articulation shaft, a crank-connecting rod articulation shaft, and a crank articulation shaft. One end of the Y-shaped connecting rod is articulated with the hanger through the connecting rod slider articulation shaft, and the other end is articulated with the L-shaped crank through the crank-connecting rod articulation shaft. The inflection point of the L-shaped crank is connected to the gate pier locking seat through the crank articulation shaft; the gate pier locking seat includes a concave groove with a first end face and a second end face, and the L-shaped crank rotates with its inflection point as the center of the circle, driving the Y-shaped connecting rod to move in space, and the hanger moves axially on the locking shaft accordingly, that is, the movable range of the hanger is between the first end face and the second end face; the elastic baffle mechanism drives the L-shaped crank to rotate as the arc-shaped working door runs.

3. The multi-stage automatic locking and unlocking device for a curved working door as claimed in claim 2, characterized in that: The elastic blocking rod mechanism comprises a blocking rod, a U-shaped limiting piece and a spring. The U-shaped limiting piece is fixed on the panel of the arc-shaped working door. One end of the spring is connected to the U-shaped limiting piece, and the other end is connected to the blocking rod.

4. The multi-stage automatic locking and unlocking device for a curved working door as claimed in claim 3, characterized in that: In the initial state, the spring is in a free state, and a part of the baffle rod is in the U-shaped limiter. When the baffle rod is squeezed by external force, the spring contracts and the baffle rod moves in the U-shaped limiter. When there is no external force acting on the baffle rod, the spring recovers and the baffle rod returns to its initial position. The baffle rod of the elastic baffle rod mechanism comes into contact with the L-shaped crank as the arc-shaped working door moves.

5. The multi-stage automatic locking and unlocking device for a curved working door according to claim 1, characterized in that: When the arc-shaped working gate is in the water-retaining working state, its bottom contacts the flow channel and its two sides contact the gate piers to form a confined space.

6. The multi-stage automatic locking and unlocking device for a curved working door according to claim 1, characterized in that: An arm hinge support is arranged behind the arc working door. When the arc working door is discharging flood or overhauling, the arc working door is rotated around the arm hinge support through the operation of the hydraulic gate hoist or the fixed winch. When it rotates to a suitable height, the arc working door is locked in the corresponding position by the arc working door locking mechanism.

7. A multi-stage automatic locking and unlocking method for a curved working door, characterized in that: The method is carried out using the device according to any one of claims 1 to 6, and comprises the following steps: When the arc-shaped working door locking mechanism is in the initial state, the side surface of the hanging part is in contact with the first end surface of the gate pier locking seat and is in the left limit position, and the L-shaped crank is in the upper limit position; The arc-shaped working door moves upward, and the hanging ear and the elastic blocking rod mechanism fixed on the arc-shaped working door move accordingly, and the blocking rod of the elastic blocking rod mechanism contacts the L-shaped crank and passes the upper limit position; The arc working door starts to move downward, and the blocking rod contacts the L-shaped crank. As the arc working door rotates, the L-shaped crank rotates with the turning point as the center under the extrusion force of the blocking rod, and the Y-shaped connecting rod also moves accordingly, driving the hanging part to move axially on the locking shaft until the hanging part fits with the second end face of the gate pier locking seat and reaches the right limit position. At this time, the L-shaped crank is at the lower limit position, and the blocking rod compresses the spring and passes the lower limit position; The arc working door continues to move downward until the hanging ear rod is completely in contact with the hook structure of the hanging part to complete the automatic locking function. The arc working door is locked by the arc working door locking mechanism, and the hydraulic hoist or fixed winch exits the working state; When the inspection is completed or the gate needs to be closed, the arc working door first moves upward under the action of the hydraulic hoist or fixed winch, the L-shaped crank rotates under the drive of the stop rod, and the Y-shaped connecting rod moves accordingly, driving the hanger to move axially on the locking shaft until the hanger fits with the first end face of the gate pier locking seat and reaches the left limit position. It will not affect the movement of the lifting ear and hanging rod, and the locking mechanism of the arc working door returns to the initial state, and the arc working door continues to move downward to complete the automatic unlocking function.

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