Mechanical locking device and inflatable cabinet

Abstract

The invention relates to a mechanical locking device and an inflatable cabinet. The mechanical locking device comprises a bent plate which is connected to a rear cover plate and is provided with a lock hole; the first interlocking mechanism comprises a first transmission shaft connected with the gas-insulated switchgear body through a first elastic element, a first crank arm rotationally connected with the gas-insulated switchgear body, and a first flexible shaft; one end of the first transmission shaft is inserted into the lock hole, and the other end is connected with the first crank arm. One end of the first flexible shaft is connected with the first crank arm, and the other end is connected with a limiting spring shaft of a circuit breaker closing position. The second interlocking mechanism comprises a second connecting lever, a second flexible shaft and a second elastic element which are rotationally connected to the gas-insulated switchgear body, the second elastic element drives the second connecting lever to provide reset, and one end of the second flexible shaft is connected with a limiting spring shaft at the opening position of the circuit breaker through the second flexible shaft; the bending plate abuts against the second crank arm, and the second elastic element is in a compressed state. Mechanical interlocking of the gas-insulated switchgear circuit breaker, the three-position disconnecting switch and the gas-insulated switchgear rear cover plate is achieved, and the gas-insulated switchgear rear cover plate interlocking device is simple in structure, safe and reliable.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment technology, and in particular to a mechanical locking device and a gas-filled cabinet. Background Technology

[0002] Gas-insulated switchgear concentrates medium-voltage components such as busbars, circuit breakers, and disconnectors within a cabinet, and is widely used due to its high safety, reliability, and adaptability. Among these, the three-position disconnector and vacuum circuit breaker are core components, undertaking important functions such as control, protection, isolation, and grounding. To ensure reliable and safe operation of the switchgear, a sophisticated interlocking mechanism is typically installed between them. This interlocking mechanism stipulates that, during operation, the three-position disconnector cannot be operated when the circuit breaker is closed, and the switchgear can only operate the three-position disconnector when the circuit breaker is open. Currently, common interlocking technologies mainly include two types: one is electromagnetic interlocking as a supplement to mechanical interlocking; the other is intelligent interlocking systems based on microcomputer-based anti-misoperation systems. However, as a type of switchgear, special spot checks have revealed common problems in the mechanical and electrical interlocking of gas-insulated switchgear.

[0003] Electromagnetic interlocking controls the power supply to and from the electromagnetic lock via an electrical circuit to achieve interlocking logic. While this technology can achieve interlocking between indirectly linked components, it relies on an external power source, which can lead to malfunction due to power failure. Furthermore, the system is complex, has numerous potential points of failure, poor anti-interference capabilities, and is costly. Intelligent interlocking systems collect equipment status data through sensors, and a central processing unit outputs control signals after judging the data according to preset logic. This system is highly dependent on the reliability of its hardware and software, and is subject to risks of system downtime or program errors. It is also very costly and complex to maintain, and if networked, it may face cybersecurity threats. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problems of multiple failure points and poor anti-interference ability of gas-filled cabinets that use interlocking mechanisms such as electromagnetic interlocking or intelligent interlocking systems in the prior art, which cause safety hazards in the gas-filled cabinets. The present invention provides a mechanical interlocking device and a gas-filled cabinet that realizes mechanical interlocking of the gas-filled cabinet circuit breaker, three-position disconnecting switch and gas-filled cabinet rear cover plate, with simple structure and safe and reliable operation.

[0005] To solve the above-mentioned technical problems, the present invention provides a mechanical locking device, which is installed on an inflatable cabinet. The inflatable cabinet includes an inflatable cabinet body and a rear cover plate connected to the inflatable cabinet body. The mechanical locking device includes... A curved plate, which is connected to the rear cover plate and is provided with a lock hole; The first interlocking mechanism includes a first drive shaft, a first crank arm, a first elastic element, and a first flexible shaft. The first drive shaft is connected to the gas cabinet body through the first elastic element, and one end of the first drive shaft is inserted into the lock hole, while the other end is connected to the first crank arm. The first crank arm is rotatably connected to the gas cabinet body, and one end of the first flexible shaft is connected to the first crank arm. The second interlocking mechanism includes a second crank arm, a second flexible shaft, and a second elastic element. The second crank arm is rotatably connected to the gas cabinet body. The second elastic element is connected to the gas cabinet body and drives the second crank arm to provide a reset. One end of the second flexible shaft is connected to the second crank arm, and the other end is connected to the limiting piece. The bent plate abuts against the second crank arm and the second elastic element is in a compressed state.

[0006] In one embodiment of the present invention, a third interlocking mechanism is further included, which includes a second drive shaft, a third crank arm, a third elastic element, and a third flexible shaft. The second drive shaft is connected to the gas cabinet body through the third elastic element, and one end of the second drive shaft is inserted into the lock hole, while the other end is connected to the third crank arm. The third crank arm is rotatably connected to the gas cabinet body. One end of the third flexible shaft is connected to the third crank arm, and the other end is connected to the connecting piece of the three-position isolating switch.

[0007] In one embodiment of the present invention, a housing connected to the gas-filled cabinet body is further included, and the first interlocking mechanism and the third interlocking mechanism are both disposed inside the housing.

[0008] In one embodiment of the present invention, a support plate connected to the inside of the outer shell is further included, the support plate forming a cavity, and the first interlocking mechanism and the third interlocking mechanism are both disposed within the cavity.

[0009] In one embodiment of the present invention, the third crank arm is provided with a roller, and the curved plate abuts against the roller.

[0010] In one embodiment of the present invention, the first elastic element sleeve is disposed outside the first transmission shaft, and the third elastic element sleeve is disposed outside the second transmission shaft.

[0011] In one embodiment of the present invention, the outer casing is provided with a guide hole, through which both the first drive shaft and the second drive shaft pass.

[0012] In one embodiment of the present invention, the first crank arm is provided with a first waist-shaped hole, one end of the first drive shaft is provided with a first connecting pin, the first connecting pin is slidably disposed in the first waist-shaped hole, the third crank arm is provided with a second waist-shaped hole, one end of the second drive shaft is provided with a second connecting pin, the second connecting pin is slidably disposed in the second waist-shaped hole.

[0013] In one embodiment of the present invention, the housing is provided with a guide groove, the second crank arm is located outside the housing and is provided with a third waist-shaped hole, a third connecting pin is slidably disposed in the third waist-shaped hole, and the third connecting pin passes through the guide groove and extends into the housing to connect the second flexible shaft.

[0014] In one embodiment of the present invention, the first drive shaft and the second drive shaft are arranged in parallel.

[0015] An inflatable switchgear includes the aforementioned mechanical locking device, an inflatable switchgear body, and a rear cover plate connected to the inflatable switchgear body. The inflatable switchgear body internally houses a three-position disconnector and a circuit breaker. The three-position disconnector has a connecting piece. The circuit breaker has an open position, a closed position, and a transmission mechanism capable of moving between the open and closed positions. The open position has a limiting piece connected to the inflatable switchgear body via an elastic element. The closed position of the circuit breaker has a limiting spring shaft connected to the transmission mechanism. The limiting spring shaft is connected to the free end of a first flexible shaft, the limiting piece is connected to the free end of a second flexible shaft, and the free end of a third flexible shaft is connected to the connecting piece. When the transmission mechanism is in the closed position, the first elastic element is in a stretched state. When the limiting piece is in the closed position, the second crank arm is in a reset state. When the connecting piece is in a grounded position, the third elastic element is in a stretched state.

[0016] Compared with the prior art, the above-described technical solution of the present invention has the following advantages: The mechanical interlocking device of this invention, when the transmission mechanism of the circuit breaker moves from the open position to the closed position, the first flexible shaft drives the first crank arm to rotate and the first elastic element to extend. The end of the first transmission shaft disengages from the locking hole of the bent plate. If the three-position disconnecting switch is not grounded properly due to a fault (only half-connected), the third flexible shaft cannot pull the third crank arm to rotate completely. At this time, the end of the second transmission shaft is not completely away from the locking hole of the bent plate, the rear cover cannot be opened, and maintenance personnel cannot enter the gas cabinet, thereby avoiding a dangerous situation. During maintenance, the rear cover is opened, the second elastic element is in the released state, and the second flexible shaft pushes the limit plate to move to the closed position of the circuit breaker. The limit plate limits the transmission mechanism of the circuit breaker, preventing the transmission mechanism from moving to the open position. At this time, the circuit breaker is not opened, reducing the risk of electric shock to maintenance personnel caused by the incomplete grounding of the three-position switch. Attached Figure Description

[0017] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein... Figure 1 This is a side view of the mechanical locking device in a preferred embodiment of the present invention. Figure 2 for Figure 1 A schematic diagram of the mechanical locking device shown from a bottom view; Figure 3 for Figure 1 A top view of the mechanical locking device shown in the diagram. Figure 4 for Figure 1 A schematic diagram of the overall structure of the mechanical interlocking device shown. Figure 5 for Figure 1 A schematic diagram of the overall structure of the mechanical locking device and the rear cover plate shown. Figure 6 for Figure 1 The diagram shows the structure of the mechanical locking device excluding the outer casing.

[0018] Explanation of reference numerals in the accompanying drawings: 1. Outer shell; 2. Bent plate; 3. Support plate; 4. Third crank arm; 5. First crank arm; 6. Second crank arm; 701. First flexible shaft; 702. Third flexible shaft; 703. Second flexible shaft; 8. First drive shaft; 9. First elastic element; 10. Second elastic element; 11. Roller; 12. Guide groove; 13. Rear cover plate; 14. Third connecting pin; 16. Pin; 17. Pin; 18. First connecting pin; 19. Third oblong hole; 20. First oblong hole; 21. Second drive shaft; 22. Third elastic element. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention. Example

[0020] For reference Figure 1 , Figure 2 ,and Figure 6 As shown, in one embodiment of the present invention, a mechanical locking device is disclosed, which is disposed on an air-filled cabinet. The air-filled cabinet includes an air-filled cabinet body and a rear cover plate 13 connected to the air-filled cabinet body. The rear cover plate 13 is opened during maintenance to allow maintenance personnel to enter the air-filled cabinet. The mechanical locking device includes... A curved plate 2 is connected to the rear cover plate 13 and is provided with a locking hole; The first interlocking mechanism includes a first drive shaft 8, a first crank arm 5, a first elastic element 9, and a first flexible shaft 701. The first drive shaft 8 is connected to the gas cabinet body through the first elastic element 9, and one end of the first drive shaft 8 is inserted into the lock hole, while the other end is connected to the first crank arm 5. The first crank arm 5 is rotatably connected to the gas cabinet body. One end of the first flexible shaft 701 is connected to the first crank arm 5, and the other end is connected to the limit spring shaft of the circuit breaker closing position. The second interlocking mechanism includes a second crank arm 6, a second flexible shaft 703, and a second elastic element 10. The second crank arm 6 is rotatably connected to the gas cabinet body. The second elastic element 10 is connected to the gas cabinet body and drives the second crank arm 6 to provide a reset. One end of the second flexible shaft 703 is connected to the second crank arm 6, and the other end is connected to the limiting piece. The bent plate 2 abuts against the second crank arm 6 and the second elastic element 10 is in a compressed state; It also includes a third interlocking mechanism, which includes a second drive shaft 21, a third crank arm 4, a third elastic element 22, and a third flexible shaft 702. The second drive shaft 21 is connected to the gas cabinet body through the third elastic element 22, and one end of the second drive shaft 21 is inserted into the lock hole, and the other end is connected to the third crank arm 4. The third crank arm 4 is rotatably connected to the gas cabinet body. One end of the third flexible shaft 702 is connected to the third crank arm 4, and the other end is connected to the connecting piece of the three-position isolating switch.

[0021] In this embodiment of the mechanical interlocking device, when the circuit breaker's transmission mechanism moves from the open position to the closed position, the transmission mechanism pulls the limit spring shaft, which in turn pulls the first flexible shaft 701. The first flexible shaft 701 drives the first crank arm 5 to rotate and the first elastic element 9 to extend. The end of the first transmission shaft 8 disengages from the locking hole of the bent plate 2. If the three-position disconnecting switch is not properly grounded due to a fault (only half-connected), the third flexible shaft 702 cannot pull the third crank arm 4 to rotate completely. At this time, the end of the second transmission shaft 21 has not completely disengaged from the locking hole of the bent plate 2, so the rear cover 13 cannot be opened, and maintenance personnel cannot enter the gas-filled cabinet. This avoids potential hazards. When the three-position disconnect switch is properly grounded, the third flexible shaft 702 pulls the third crank arm 4 to rotate completely. At this time, the end of the second transmission shaft 21 completely leaves the locking hole of the bent plate 2, and the rear cover 13 can be opened. During maintenance, the rear cover 13 is opened, the second elastic element 10 is in the released state, and the second crank arm 6 rotates, driving the second flexible shaft 703 to push the limit plate to the closed position of the circuit breaker. The limit plate limits the transmission mechanism of the circuit breaker, preventing the transmission mechanism from moving to the open position. At this time, the circuit breaker is not opened, reducing the risk of electric shock to maintenance personnel caused by the three-position switch not being fully grounded.

[0022] For reference Figure 6 As shown, in one embodiment of the present invention, the first flexible shaft, the second flexible shaft, and the third flexible shaft are always in a taut state.

[0023] For reference Figure 6 As shown, in one embodiment of the present invention, the bent plate 2 is configured as an "L"-shaped structure with a short part and a long part connected together. The short part of the bent plate 2 is connected to the rear cover plate 13, and the long part is used to abut against the third crank arm 4.

[0024] In one embodiment of the present invention, the bent plate 2 is provided with two locking holes through which the ends of the first drive shaft 8 and the second drive shaft 21 pass, respectively, so as to ensure that the rear cover plate 13 can be released when the first drive shaft 8 and the second drive shaft 21 are completely disengaged from the bent plate 2.

[0025] For reference Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, in one embodiment of the present invention, a housing 1 connected to the gas-filled cabinet body is also included. The first interlocking mechanism and the third interlocking mechanism are both disposed inside the housing 1. The housing 1 is provided with through holes for the first flexible shaft 701, the second flexible shaft 703, and the third flexible shaft 702 to pass through. The housing 1 can reduce motion interference and external influences.

[0026] For reference Figure 3 As shown, in one embodiment of the present invention, the support plate 3 connected to the inside of the outer shell 1 forms a cavity, and the first interlocking mechanism and the third interlocking mechanism are both disposed in the cavity.

[0027] For reference Figure 1 As shown, in one embodiment of the present invention, the third crank arm 4 is provided with a roller 11, and the curved plate 2 abuts against the roller 11. The roller 11 can reduce the friction between the curved plate 2 and the second crank arm 6, making the second crank arm 6 rotate more smoothly and flexibly.

[0028] For reference Figure 6 As shown, in one embodiment of the present invention, the first elastic element 9 is sleeved outside the first transmission shaft 8, with one end connected to the first transmission shaft 8 and the other end connected to the outer shell 1; the third elastic element 22 is sleeved outside the second transmission shaft 21, with one end connected to the second transmission shaft 21 and the other end connected to the outer shell 1.

[0029] In one embodiment of the present invention, the housing 1 is provided with a plurality of guide holes, one end of the first drive shaft 8 and the second drive shaft 21 both pass through the guide holes, and the guide holes ensure that the first drive shaft 8 and the second drive shaft 21 slide precisely along their respective axial directions.

[0030] For reference Figure 6 As shown, in one embodiment of the present invention, one end of the first crank arm 5 is provided with a first waist-shaped hole 20, and one end of the first transmission shaft 8 is provided with a first connecting pin 18. The first connecting pin 18 is slidably disposed in the first waist-shaped hole 20. The first waist-shaped hole 20 provides sliding space for the first connecting pin 18, so that the rotational motion of the first crank arm 5 can be effectively converted into the linear motion of the first transmission shaft 8, and the first crank arm 5 can work normally even if there is an installation error. Similarly, the third crank arm 4 is provided with a second waist-shaped hole, and one end of the second transmission shaft 21 is provided with a second connecting pin. The second connecting pin is slidably disposed in the second waist-shaped hole, and the second waist-shaped hole provides sliding space for the second connecting pin, so that the rotational motion of the third crank arm 4 can be effectively converted into the linear motion of the second transmission shaft 21, and the third crank arm 4 can work normally even if there is an installation error.

[0031] For reference Figure 3 As shown, in one embodiment of the present invention, the outer casing 1 is provided with a guide groove 12, the second crank arm 6 is located outside the outer casing 1 and one end is provided with a third waist-shaped hole 19, a third connecting pin 14 is slidably disposed in the third waist-shaped hole 19, the third connecting pin 14 passes through the guide groove 12 and extends into the outer casing 1 to connect the second flexible shaft 703, the second flexible shaft 703 drives the second crank arm 6 to rotate through the third connecting pin 14, when the second crank arm 6 rotates, under the guiding action of the guide groove 12, the third connecting pin 14 slides along the guide groove 12 to prevent the second flexible shaft 703 from swinging.

[0032] For reference Figure 6 As shown, in one embodiment of the present invention, the first drive shaft 8 and the second drive shaft 21 are arranged in parallel.

[0033] For reference Figure 6 As shown, in one embodiment of the present invention, the first elastic element 9 and the second elastic element 10 are provided as springs, and the third elastic element 22 is provided as a torsion spring.

[0034] For reference Figure 6 As shown, in one embodiment of the present invention, the third crank arm 4 is rotatably connected to the outer casing 1 via a pin 16, and the first crank arm 5 is rotatably connected to the outer casing 1 via a pin 17.

[0035] For reference Figure 4 and Figure 6 As shown, in one embodiment of the present invention, the first crank arm 5, the second crank arm 6, and the third crank arm 4 are all configured as "L"-shaped structures, and the "L"-shaped structures are configured to rotate around the pin shaft by having a pin shaft in the middle. Example

[0036] An inflatable switchgear includes the aforementioned mechanical locking device, the switchgear body (not shown), and a rear cover plate 13 connected to the switchgear body. The switchgear body houses a three-position isolating switch (not shown) and a circuit breaker (not shown). The three-position isolating switch has a connecting piece (not shown). The circuit breaker has an open position (not shown), a closed position (not shown), and a transmission mechanism (not shown) capable of moving between the open and closed positions. When the transmission mechanism is in the open position, the circuit breaker is in an open state; when the transmission mechanism is in the closed position, the circuit breaker is in a closed state. The open position has a limiting piece connected to the switchgear body via an elastic element, which is in a stretched state. The closed position of the circuit breaker has a limiting spring shaft connected to the transmission mechanism. The limiting spring shaft is connected to the free end of a first flexible shaft 701. When the transmission mechanism moves from the open position to the closed position, the transmission mechanism drives the limiting spring shaft to move, limiting the movement of the limiting spring shaft. The spring shaft drives the first flexible shaft 701 to move, the first flexible shaft 701 drives the first crank arm 5 to rotate and the first transmission shaft 8 to disengage from the bending plate 2; the limiting plate is connected to the free end of the second flexible shaft 703. When the rear cover plate 13 is in the open state, the second elastic element 10 drives the second crank arm 6 to rotate and reset, the second crank arm 6 pulls the second flexible shaft 703, and the second flexible shaft 703 pulls the limiting plate to the closed position to limit the transmission mechanism; the free end of the third flexible shaft 702 is connected to the connecting piece. When the three-position disconnect switch is in the grounded position, the connecting piece drives the third flexible shaft 702 to move, the third flexible shaft 702 drives the third crank arm 4 to rotate, the third crank arm 4 pulls the third elastic element 702 to reset and the second transmission shaft 21 to disengage from the bending plate 2; when the transmission mechanism is in the closed position, the first elastic element 9 is in the stretched state; when the limiting plate is in the closed position, the second crank arm 6 is in the reset state; when the connecting piece is in the grounded position, the third elastic element 22 is in the stretched state.

[0037] The working principle of the mechanical locking device described in this invention is as follows: When it is necessary to enter the gas-insulated switchgear for maintenance, first connect the three-position disconnect switch to the grounding position. The third flexible shaft 702 drives the third crank arm 4 to rotate under the pull of the connecting plate, and the third elastic element 22 is stretched. The end of the second transmission shaft 21 disengages from the locking hole of the bending plate 2. Then, move the transmission mechanism of the circuit breaker to the closed position. The transmission mechanism pulls the first flexible shaft 701, and the first flexible shaft 701 pulls the first crank arm 5 to rotate. The first elastic element 9 is stretched, and the end of the first transmission shaft 8 disengages from the locking hole of the bending plate 2. At this time, the three-position disconnect switch is effectively grounded, and the rear cover 13 can be opened. After the rear cover 13 is opened, the bending plate 2 and the roller 11 separate. The second crank arm 6 rotates and resets under the drive of the second elastic element 10. The second crank arm 6 pulls the second flexible shaft 703, causing the limit plate to move to the closed position. The limit plate forms a jamming effect on the transmission mechanism, preventing the transmission mechanism from moving from the closed position to the open position. At this time, the circuit breaker cannot be opened, and maintenance personnel can enter the gas-insulated switchgear for maintenance. After maintenance, the rear cover plate 13 is replaced. The bending plate 2 pushes the roller 11 to rotate the second crank arm 6, compressing the second elastic element 10. The second flexible shaft 703 is in the released state, and the limit plate leaves the closed position driven by the spring's restoring force. At this time, the circuit breaker can be opened. The maintenance personnel operate the three-position disconnecting switch to disconnect it from the grounding position. The third flexible shaft 702 is in the released state, the third elastic element 22 returns to its natural state, and the third crank arm 4 rotates so that the end of the second transmission shaft 21 is inserted into the locking hole of the bending plate 2. When the circuit breaker's transmission mechanism moves from the closed position, the open position is completed. The first flexible shaft 701 is in the released state, the first elastic element 9 returns to its natural state and pulls the first crank arm 5 to rotate, thereby driving the end of the first transmission shaft 8 to be inserted into the locking hole of the bending plate 2. At this time, the rear cover plate 13 is locked.

[0038] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A mechanical locking device, characterized in that The mechanical locking device comprises, a bent plate connected to the back cover plate and provided with a lock hole; a first interlocking mechanism comprising a first transmission shaft, a first crank, a first elastic element and a first flexible shaft, the first transmission shaft being connected to the gasholder body through the first elastic element, one end of the first transmission shaft being inserted into the lock hole and the other end being connected to the first crank, the first crank being rotationally connected to the gasholder body, one end of the first flexible shaft being connected to the first crank; a second interlocking mechanism comprising a second crank, a second flexible shaft and a second elastic element, the second crank being rotationally connected to the gasholder body, the second elastic element being connected to the gasholder body and driving the second crank to provide reset, one end of the second flexible shaft being connected to the second crank; wherein when the back cover plate is connected to the gasholder body, the bent plate abuts against the second crank and the second elastic element is in a compressed state.

2. A mechanical locking device according to claim 1, characterized in that a third interlocking mechanism comprising a second transmission shaft, a third crank, a third elastic element and a third flexible shaft, the second transmission shaft being connected to the gasholder body through the third elastic element, one end of the second transmission shaft being inserted into the lock hole and the other end being connected to the third crank, the third crank being rotationally connected to the gasholder body, one end of the third flexible shaft being connected to the third crank.

3. A mechanical closure device according to claim 2, wherein, a shell connected to the gasholder body, the first interlocking mechanism and the third interlocking mechanism being arranged in the shell.

4. A mechanical closure device according to claim 3, wherein, a support plate connected to the inside of the shell, the support plate enclosing a cavity, the first interlocking mechanism and the third interlocking mechanism being arranged in the cavity.

5. A mechanical closure device according to claim 2, wherein, the third crank being provided with a roller, the bent plate abutting against the roller.

6. A mechanical closure device according to claim 2, wherein, the first elastic element sleeve being arranged outside the first transmission shaft, and the third elastic element sleeve being arranged outside the second transmission shaft.

7. A mechanical closure device according to claim 3, wherein the shell being provided with a guide hole, the first transmission shaft and the second transmission shaft both passing through the guide hole.

8. A mechanical closure device according to claim 2, wherein, the first crank being provided with a first waist-shaped hole, one end of the first transmission shaft being provided with a first connecting pin shaft, the first connecting pin shaft being slidingly arranged in the first waist-shaped hole, the third crank being provided with a second waist-shaped hole, one end of the second transmission shaft being provided with a second connecting pin shaft, the second connecting pin shaft being slidingly arranged in the second waist-shaped hole.

9. A mechanical closure device according to claim 3, wherein the shell being provided with a guide sliding groove, the second crank being located outside the shell and provided with a third waist-shaped hole, a third connecting pin shaft being slidingly arranged in the third waist-shaped hole, the third connecting pin shaft passing through the guide sliding groove and extending into the shell to connect the second flexible shaft.

10. An air chamber comprising a mechanical closure device as claimed in any one of the claims 1 to 9, characterized in that The utility model also includes the air tank body and the back cover plate connected with the air tank body, the inside of air tank body is provided with three position disconnecting switch and circuit breaker, three position disconnecting switch is equipped with the connecting piece, the circuit breaker is equipped with the opening position, the closing position and the transmission mechanism can move between the opening position and the closing position, the opening position is equipped with the limit piece connected with the air tank body through the elastic element, the closing position of circuit breaker is equipped with the limit spring shaft connected with the transmission mechanism, the limit spring shaft is connected with the free end of first flexible axle, the limit piece is connected with the free end of second flexible axle, the free end of third flexible axle is connected with the connecting piece, when the transmission mechanism is located in the closing position, the first elastic element is in the tensile state, when the limit piece is located in the closing position, the second crank arm is in the reset state, when the connecting piece is located in the grounding position, the third elastic element is in the tensile state.

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