Orifice coupling type automatic opening and closing cover plate device

Abstract

The utility model relates to an orifice coupling type automatic cover plate opening and closing device which specifically comprises a driving rack, a cover plate opening and closing auxiliary mechanism, a personnel emergency operation mechanism, a cover plate device and a safety control system. The driving racks are installed on the two sides of the climbing device, and vertical movement of the climbing device is converted into opening and closing operation of the cover plate device in a gear and rack meshing mode. The cover plate opening and closing auxiliary mechanism achieves conversion and transmission of driving force through mechanical transmission parts such as gears, chain wheels and chains. The personnel emergency operation mechanism allows the cover plate to be manually opened and closed when the system breaks down, and field safety is ensured. And the safety control system is used for monitoring the moving track of the cover plate device on the supporting track. Efficient and safe opening and closing of the orifice cover plate are achieved through automatic control and mechanical linkage, the orifice cover plate is particularly suitable for working occasions where frequent entering and exiting of orifices are needed, and working efficiency and operation safety are greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of manhole orifice safety protection, in particular to a hole orifice coupling type automatic switch cover device. BACKGROUND

[0002] In daily work, we will involve many work that need to pass in and out of the manhole, generally the equipment hole part is installed with a hole cover, when the operating personnel need to pass through the hole, the hole cover needs to be opened. But when the hole part is installed with a climbing device, the cover needs to be opened in advance during the operation of the climbing device. At present, the opening and closing operation of the manhole cover mainly has two ways: manual operation and electric drive. Manual operation needs to arrange one person to be responsible for the opening and closing of the hole cover. When entering the hole, the cover is opened first, the climbing device is avoided, and the cover is closed after entering a certain position to ensure the safety of the hole part area. This method has the risk of falling when the operator stands on the edge of the hole to open the cover. Electric drive is to add a set of electric drive device at the hole part to realize the opening and closing of the cover, but this method has the following problems:

[0003] 1. The operation and maintenance cost is increased, and a separate power source is needed to drive the device. If there is no power supply on site, the cost of separately arranging the power supply is high.

[0004] 2. The opening and closing of the cover cannot be effectively linked with the lifting operation of the climbing device. The climbing device and the cover are two independent operating devices with their own driving mechanisms, but when the hole part needs to be controlled in sequence, more sensors need to be added to realize the linkage operation of the device and the cover. But in the actual operation process, the collision between the device and the cover may cause damage to the device and injury to the personnel due to sensor failure.

[0005] 3. There is a risk of electric shock. The climbing device generally uses safe voltage, but the cover is directly driven by 220V, which poses a risk of electric shock to the climbers.

[0006] How to safely, efficiently and effectively link the hole part of the climbing device for effective safety protection is a problem to be solved. SUMMARY

[0007] The technical problem to be solved by this utility model is to provide an orifice coupling type automatic opening and closing cover device. The upward and downward movement of the climbing device itself serves as the power source for this utility model device, driving the drive racks installed on both sides of the climbing device to follow the climbing device up and down. The drive racks mesh with the gears of the cover device, and the output is converted and reversed through the bevel gear, thereby driving the chain to rotate in both directions. This causes the cover connecting device at the bottom of the drive chain to perform reciprocating linear motion, realizing the automatic and safe opening and closing function of the corresponding orifice cover, ensuring the safe operation of the orifice part of the climbing device.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an orifice-coupled automatic cover plate opening and closing device, comprising a drive rack, a cover plate opening and closing auxiliary mechanism, a personnel emergency operation mechanism, a cover plate device, and a safety control system, wherein:

[0009] The drive rack serves as a power input drive device, transmitting the up-and-down movement of the climbing device to the upper and lower gears in a gear-rack meshing manner. It also drives the cover plate device to perform opening and closing operations through the switching of the orifice cover plate switch auxiliary mechanism.

[0010] The cover plate switch auxiliary mechanism is used to receive the driving force transmitted by the drive rack and use the power to drive the opening and closing operation of the cover plate device. The cover plate switch auxiliary mechanism consists of a gear, a sprocket, an input shaft, a chain, a rotating shaft, a bevel gear, a driven bevel gear, and a connecting shaft. The gear is mounted on the input shaft, and the power of the drive rack is transmitted to the cover plate device.

[0011] In the preferred embodiment, the personnel emergency operation mechanism provides an emergency switch for operators and ensures on-site work safety when the system device malfunctions or the cover plate device needs to be temporarily switched on or off for work purposes. The personnel emergency operation mechanism consists of an operating handle, a manual bevel gear, and a linkage bevel gear.

[0012] In a preferred embodiment, the safety control system consists of a cover plate fully closed detection device, a cover plate fully open detection device, and an audible and visual alarm device. The cover plate fully closed detection device and the cover plate fully open detection device are installed at both ends of the support rail on which the cover plate device is located, and are used to detect the travel trajectory of the cover plate device on the support rail. The visual alarm device is installed on the climbing device.

[0013] In a preferred embodiment, the drive rack is welded to the outer side frame of the climbing device. The drive rack includes an upper drive rack and a lower drive rack. The upper drive rack cooperates with the upper switch auxiliary mechanism of the cover plate device, and the lower drive rack cooperates with the lower switch auxiliary mechanism of the cover plate device.

[0014] In a preferred embodiment, the cover plate switching auxiliary mechanism includes a base, which comprises an upper base and a lower base;

[0015] The upper base is installed above the concrete hole, and the upper base is provided with a first clearance groove, a first receiving drive component mounting hole, a first transmitting drive component mounting hole, a first cover plate switch actuator clearance groove, and a first cover plate switch actuator mounting hole.

[0016] The lower base is installed below the concrete hole, and the lower base is provided with a second clearance groove, a second receiving drive component mounting hole, a second transmitting drive component mounting hole, a second cover plate switch actuator clearance groove, and a second cover plate switch actuator mounting hole.

[0017] In a preferred embodiment, the upper base is fixedly connected to the ground.

[0018] In a preferred embodiment, the lower base is fixedly connected to the ground.

[0019] In a preferred embodiment, in the cover plate switch auxiliary mechanism, when the climbing device moves downward, the cover plate device performs an opening operation. The upper drive rack at the orifice drives the upper gear to do work downward, causing the upper chain to rotate counterclockwise. Under the conversion of the bevel gear and the driven bevel gear, the connecting shaft rotates clockwise, causing the upper cover plate drive chain to rotate clockwise, thereby driving the cover plate device to move in the opening direction, realizing the automatic opening function of the cover plate device.

[0020] In the preferred embodiment, after the climbing device descends to the set height, the cover plate device performs a closing operation. The lower drive rack drives the lower gear to do work downwards, causing the lower chain to rotate clockwise. Under the conversion of the bevel gear and the driven bevel gear, the connecting shaft rotates counterclockwise, causing the lower cover plate drive chain to rotate counterclockwise, thereby driving the cover plate device to move in the closing direction, realizing the automatic closing function of the cover plate device.

[0021] In a preferred embodiment, the drive cover plate device is installed at the concrete hole. The drive cover plate device is composed of multiple standard strip-shaped steel cover plate strips spliced ​​together. The cover plate strips are connected to form a whole through hinges and connected to the upper chain and lower chain of the cover plate switch auxiliary mechanism through connecting rods. It moves parallel on the support rail and enters the rotating track along the support rail under the drive of external force.

[0022] The orifice-coupled automatic cover plate device provided by this utility model has the following beneficial effects by adopting the above structure:

[0023] (1) By integrating a drive rack and pinion, an orifice cover switch auxiliary mechanism, a personnel emergency operation mechanism, a cover device, and a safety control system, this device can automatically complete the opening and closing of the cover without human intervention. Specifically, when the climbing device moves up and down, the power is transmitted to the orifice cover switch auxiliary mechanism through the meshing of the gear rack and pinion, thereby driving the cover device to perform the opening and closing operation. This series of actions is completed automatically by the mechanical structure without the need for additional human intervention, which greatly improves work efficiency and reduces errors and delays caused by human factors.

[0024] (2) The use of efficient mechanical transmission methods such as gear rack, sprocket and chain makes the overall structure of the device more compact and reasonable. These mechanical components can not only effectively transmit power, but also simplify the complexity of the device, making it easier to install, debug and maintain.

[0025] (3) The cover plate device can adjust the opening and closing cover size according to actual needs, and is suitable for different sizes of orifice environments, with strong environmental adaptability. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0027] Figure 1 This is a schematic diagram of the drive rack mounting structure of this utility model.

[0028] Figure 2 This utility model Figure 1 A detailed structural diagram of point A in the middle.

[0029] Figure 3 This is a schematic diagram of the upper base structure of this utility model.

[0030] Figure 4 This is a schematic diagram of the lower base structure of this utility model.

[0031] Figure 5 This is a schematic diagram of the personnel emergency operation mechanism of this utility model.

[0032] Figure 6 This is a schematic diagram of the cover plate device of this utility model.

[0033] Figure 7 This is a schematic diagram of the automatic switching logic of the cover plate device of this utility model.

[0034] Figure 8 This is a schematic diagram of the structure in practical application of this utility model.

[0035] Figure 9 This is a schematic diagram of the cover plate device of this utility model.

[0036] In the diagram: Concrete hole 0, Climbing device 02, Drive device 1, Drive rack 11, Upper drive rack 111, Lower drive rack 112, Cover plate switch auxiliary mechanism 2, Base 21, Upper base 211, First clearance groove 211-1, First receiving drive component mounting hole 211-2, First transmitting drive component mounting hole 211-3, First plate switch actuator clearance groove 211-4, First cover plate switch actuator mounting hole 211-5, Lower base 212, Second clearance groove 212-1, Second receiving drive component mounting hole 212-2, Second transmitting drive component mounting hole 212-3, Second cover plate switch actuator clearance groove 212-4, Second cover plate switch actuator mounting hole 212-5, Gear 22, Upper gear 221, Lower gear 222, Sprocket 23, Input shaft 24, Chain 25, Upper chain 251-1, Upper cover plate drive chain 251-2, Lower chain 252-1, Lower cover plate drive chain 252-2, Central shaft 26, Bevel gear 27, Driven bevel gear 28, Connecting shaft 29, Personnel emergency operation mechanism 3, Operating handle 31, Manual bevel gear 32, Linkage bevel gear 33, Cover plate device 4, Support rail 41, Connecting rod 42, Cover plate strip 43, Hinge 44, Rotating rail 45, Safety control system 5. Detailed Implementation

[0037] Example 1:

[0038] An orifice-coupled automatic cover plate opening and closing device comprises five parts: a drive rack 11, a cover plate opening and closing auxiliary mechanism 2, a personnel emergency operation mechanism 3, a cover plate device 4, and a safety control system 5. The drive rack 11 is welded to both sides of the climbing device body and its main function is to use the up-and-down movement of the climbing device 02 as a power source to trigger the opening and closing movement of the cover plate device by meshing with the driven gear.

[0039] The orifice cover plate switching auxiliary mechanism 2 consists of two sets of receiving devices, which are installed at the top and bottom of the orifice respectively. Its main function is to receive the power transmitted from the drive rack, process it through the driven gear, and then transmit the power to the chain as needed, thereby driving the orifice cover plate to perform opening and closing operations. This realizes the automatic opening and closing function of the cover plate during the climbing device 02's up and down passage. The mechanism includes a base 21, gears, sprockets, input shaft, chain, transfer shaft, bevel gear, driven bevel gear, and connecting shaft, etc.

[0040] The main function of the personnel emergency operation mechanism 3 is to provide an emergency switch for operators when the automatic switch system device malfunctions or when the cover plate needs to be temporarily switched due to work requirements, so as to ensure on-site work safety.

[0041] The cover plate device 4 is installed at the orifice and is made of multiple standard strip-shaped steel products. They are connected by hinges to form a cover plate, which can effectively cover the orifice. Under external force, it can enter the rotating track along the track system, ensuring that the cover plate device is effectively stored in the rotating track and reducing the impact on the ground area.

[0042] Safety control system 5 mainly detects the position of the cover plate device. When the cover plate fails to perform the required action after the specified action, it will issue an audible and visual alarm and promptly transmit the signal to the climbing device control system to achieve effective control of the climbing device and ensure the safe operation of the equipment.

[0043] Example 2:

[0044] Based on the device described in Embodiment 1, specifically: the device includes a drive rack 11, an orifice cover plate switching auxiliary mechanism 2, a personnel emergency operation mechanism 3, a cover plate device 4, and a safety control system 5, wherein:

[0045] The drive rack 11 serves as the power input drive device 1, transmitting the up-and-down movement of the climbing device 02 to the upper gear 221 and the lower gear 222 in a gear and rack meshing manner, and driving the cover plate device 4 to perform opening and closing operations through the conversion of the orifice cover plate switch auxiliary mechanism 2.

[0046] The cover plate switch auxiliary mechanism 2 is used to receive the driving force transmitted by the drive rack 11 and use the power to drive the opening and closing operation of the cover plate device 4. The cover plate switch auxiliary mechanism 2 is composed of a gear 22, a sprocket 23, an input shaft 24, a chain 25, a rotating shaft 26, a bevel gear 27, a driven bevel gear 28 and a connecting shaft 29. The gear 22 is mounted on the input shaft 24, and the power of the drive rack 11 is transmitted to the cover plate device 4.

[0047] The personnel emergency operation mechanism 3 is an emergency switch provided to the operator when the system device malfunctions or when the cover plate device 4 needs to be temporarily switched due to work requirements, to ensure on-site work safety. It is mainly composed of an operating handle 31, a manual bevel gear 32 and a linkage bevel gear 33.

[0048] The safety control system 5 consists of a cover plate fully closed detection device 51, a cover plate fully open detection device 52, and an audible and visual alarm device. The cover plate fully closed detection device 51 and the cover plate fully open detection device 52 are installed at both ends of the support rail 41 where the cover plate device 4 is located, and are used to detect the walking trajectory of the cover plate device 4 on the support rail 41. The visual alarm device is installed on the climbing device 02.

[0049] in:

[0050] The drive rack 11 is installed on the two outer side frames of the climbing device 02 by welding. The drive rack 11 includes an upper drive rack 111 and a lower drive rack 112. The upper drive rack 111 cooperates with the upper switch auxiliary mechanism of the cover plate device 4, and the lower drive rack 112 cooperates with the lower switch auxiliary mechanism of the cover plate device 4.

[0051] The cover plate switch auxiliary mechanism 2 includes a base 21, which includes an upper base 211 and a lower base 212. The upper base 211 is installed above the concrete hole 0. The upper base 211 is provided with a first clearance groove 211-1, a first receiving drive component mounting hole 211-2, a first transmitting drive component mounting hole 211-3, a first cover plate switch actuator clearance groove 211-4, and a first cover plate switch actuator mounting hole 211-5. The upper base 211 is fixedly connected to the ground. The lower base 212 is installed below the concrete hole 0. The lower base 212 is provided with a second clearance groove 212-1, a second receiving drive component mounting hole 212-2, a second transmitting drive component mounting hole 212-3, a second cover plate switch actuator clearance groove 212-4, and a second cover plate switch actuator mounting hole 212-5. The lower base 212 is fixedly connected to the ground.

[0052] In the cover plate switch auxiliary mechanism 2, when the climbing device 02 moves downward, the cover plate device 4 performs the opening operation. The upper drive rack 111 of the orifice drives the upper gear 221 to do work downward, which drives the upper chain 251-1 to rotate counterclockwise. Under the conversion of the bevel gear 27 and the driven bevel gear 28, the connecting shaft 29 rotates clockwise, which drives the upper cover plate drive chain 251-2 to rotate clockwise, thereby driving the cover plate device 4 to move in the opening direction, realizing the automatic opening function of the cover plate device 4.

[0053] When the climbing device 02 descends to the set height, the cover plate device 4 performs the closing operation. The lower drive rack 112 drives the lower gear 222 to do work downward, causing the lower chain 252-1 to rotate clockwise. Under the conversion of the bevel gear 27 and the driven bevel gear 28, the connecting shaft 29 rotates counterclockwise, causing the lower cover plate drive chain 252-2 to rotate counterclockwise, thereby driving the cover plate device 4 to move in the closing direction, realizing the automatic closing function of the cover plate device 4.

[0054] The drive cover plate device 4 is installed at the concrete hole 0. The drive cover plate device 4 is composed of multiple standard strip-shaped steel cover plate strips 43 spliced ​​together. The cover plate strips 43 are connected to form a whole by hinges 44, and are connected to the upper chain 251-1 and lower chain 252-1 of the cover plate switch auxiliary mechanism 2 by connecting rods 42. It moves parallel on the support rail 41 and enters the rotating rail 45 along the support rail 41 under the drive of external force.

[0055] The length L of the drive rack 11 is greater than the length of the cover plate device 4.

[0056] The upper base 211 has a height of ≥2m, and the lower base 212 has a height of ≥2.5m.

[0057] Example 3:

[0058] Combination Figure 7 The installation and use method of an orifice coupling type automatic switch cover device includes the following steps:

[0059] 1) Determine the boarding location for H2

[0060] Based on the descent height h1 between H2 and H3, the system transmission ratio n of the cover plate switch auxiliary mechanism 2 is designed and calculated, and the height of H2 is controlled to be no more than 250mm to facilitate the passage of personnel to climb up and down the climbing device, thereby determining the stopping position of the climbing device.

[0061] 2) Determine the position of H3 stop opening cover device 4

[0062] Position H3 ensures that the cover plate device 4 at the orifice is fully opened and that the climbing device 02 does not interfere with the cover plate device 4, thereby determining the parking position after the climbing device 02 is opened;

[0063] 3) Determine the position of H1 to start opening the cover plate device 4

[0064] Based on the transmission ratio n of the cover plate switch auxiliary mechanism system 2, the effective length L of the drive rack 11 is determined, and the height between H1 and H2 is ≥ L. The installation position of the drive rack 11 in the non-climbing device is determined, that is, the installation position of the upper gear 221 in the cover plate switch auxiliary mechanism 2 is determined. Then, the cover plate switch auxiliary mechanism 2 is fixedly installed on the concrete at the opening of the concrete hole 0.

[0065] 4) Determine the position of H4 starting to close the cover plate device 4.

[0066] After the climbing device 02 and the passengers have all entered the opening, the cover closing device 4 is activated. The installation position of the lower gear 222 in the cover switch auxiliary mechanism 2 is determined according to the distance ≥2.5m below the opening, which determines the closing position of the cover device 4 below the opening.

[0067] 5) Determine the position of H5 stop closing cover device 4

[0068] The position of H5 = H4 + L.

[0069] Figure 7 In the given information, H1=H10, H2=H9, H3=H8, H4=H7, and H5=H6.

[0070] The operating logic control method for the orifice-coupled automatic cover plate opening and closing device specifically includes the following two parts:

[0071] When the climbing device 02 is in the downward motion mode, the system operation flow is as follows:

[0072] Personnel stand on the non-climbing device (H2) → Climbing device 02 is energized and descends → Upper drive rack 111 drives cover plate device 4 to open the cover plate → Cover plate fully open (H3) → Climbing device 02 descends → Lower drive rack 112 drives cover plate device 4 to close the cover plate (H4) → Climbing device 02 descends → Cover plate fully closed (H5) → Climbing device 02 descends → Climbing device 02 stops;

[0073] When the climbing device 02 is in the upward movement mode, the system operation flow is as follows:

[0074] Personnel stand on the non-climbing device → Climbing device 02 is energized and moves upward → Lower drive rack 112 drives the cover switch device to open the cover (H6) → Cover fully open (H7) → Climbing device 02 moves upward → Upper drive rack 111 drives the cover switch device to close the cover (H8) → Climbing device 02 moves upward → Cover fully closed (H9) → Climbing device 02 stops.

[0075] This utility model achieves automated opening and closing of the cover plate by integrating a drive rack, a cover plate switching auxiliary mechanism, a personnel emergency operation mechanism, a cover plate device, and a safety control system. This not only improves work efficiency and reduces the need for manual operation, but also enhances the safety and reliability of the system. In particular, it can ensure the safety of operators in emergency situations and is suitable for working environments that require frequent opening and closing of the cover plate.

Claims

1. An orifice-coupled automatic uncovering and covering plate device, characterized by: The utility model relates to a safety control system for concrete hole cover device, including drive rack (11), apron switch auxiliary mechanism (2), personnel emergency operation mechanism (3), apron device (4) and safety control system (5), wherein: The drive rack (11) is used as the power input driving device (1), the up and down operation of the climbing device (02) is transmitted to the upper gear (221) and the lower gear (222) in the gear and rack meshing operation mode, and the apron device (4) is driven to switch operation through the conversion of the orifice apron switch auxiliary mechanism (2); The apron switch auxiliary mechanism (2) is used for receiving the driving force transmitted by the drive rack (11) and driving the apron device (4) to switch operation, and the apron switch auxiliary mechanism (2) is composed of a gear (22), a sprocket (23), an input shaft (24), a chain (25), a transfer shaft (26), a bevel gear (27), a driven bevel gear (28) and a connecting shaft (29), wherein the gear (22) is installed on the input shaft (24), and the driving force of the drive rack (11) is transmitted to the apron device (4).

2. An orifice coupled automatic uncovering and covering plate device according to claim 1, characterized in that: The personnel emergency operation mechanism (3) is used for providing emergency switch for the operator and ensuring the safety of the on-site operation when the system device fails or needs to be temporarily switched off for work, and the personnel emergency operation mechanism (3) is composed of an operation handle (31), a manual bevel gear (32) and a linkage bevel gear (33).

3. An orifice coupled automatic uncovering and covering plate device according to claim 1, characterized in that: The safety control system (5) is installed at both ends of the support rail (41) where the apron device (4) is located, and is used for detecting the running track of the apron device (4) on the support rail (41).

4. An orifice coupled automatic uncovering and covering plate device according to claim 1, characterized in that: The safety control system (5) is composed of a full-closed apron detection device (51), a full-open apron detection device (52) and an audible and visual alarm device, the full-closed apron detection device (51) and the full-open apron detection device (52) are installed at both ends of the support rail (41) where the apron device (4) is located, and are used for detecting the running track of the apron device (4) on the support rail (41), and the audible and visual alarm device is installed on the climbing device (02).

5. An orifice coupled automatic uncovering and covering plate device according to claim 1, characterized in that: The apron switch auxiliary mechanism (2) comprises a base (21), and the base (21) comprises an upper base (211) and a lower base (212); The upper base (211) is installed above the concrete hole (0), and the upper base (211) is provided with a first avoiding groove (211-1), a first driving receiving member mounting hole (211-2), a first driving transmission member mounting hole (211-3), a first apron switch execution mechanism avoiding groove (211-4) and a first apron switch execution mechanism mounting hole (211-5); The lower base (212) is installed below the concrete hole (0), and the lower base (212) is provided with a second avoiding groove (212-1), a second driving receiving member mounting hole (212-2), a second driving transmission member mounting hole (212-3), a second apron switch execution mechanism avoiding groove (212-4) and a second apron switch execution mechanism mounting hole (212-5).

6. An orifice coupled automatic uncovering and covering plate device according to claim 5, characterized in that: The upper base (211) is fixedly connected with the ground.

7. An orifice coupled automatic uncovering and covering plate device according to claim 5, characterized in that: The lower base (212) is fixedly connected with the ground.

8. An orifice coupled automatic uncovering and covering plate device according to claim 1, characterized in that: In the cover plate switch auxiliary mechanism (2), when the climbing device (02) moves downward, the cover plate device (4) performs the cover opening operation, the upper driving rack (111) drives the upper gear (221) to work downward, drives the upper chain (251-1) to rotate counterclockwise, and drives the connecting shaft (29) to rotate clockwise through the conversion of the bevel gear (27) and the driven bevel gear (28), drives the upper cover plate driving chain (251-2) to rotate clockwise, thereby driving the cover plate device (4) to move in the direction of cover opening, and realizing the automatic cover opening function of the cover plate device (4).

9. An orifice coupled automatic uncovering and covering plate device according to claim 8, characterized in that: After the climbing device (02) moves downward to the set height, the cover plate device (4) performs the cover closing operation, the lower driving rack (112) drives the lower gear (222) to work downward, drives the lower chain (252-1) to rotate clockwise, and drives the connecting shaft (29) to rotate counterclockwise through the conversion of the bevel gear (27) and the driven bevel gear (28), drives the lower cover plate driving chain (252-2) to rotate counterclockwise, thereby driving the cover plate device (4) to move in the direction of cover closing, and realizing the automatic cover closing function of the cover plate device (4).

10. An orifice coupled automatic uncovering and covering plate device according to claim 1, characterized in that: The driving cover plate device (4) is installed at the concrete hole (0) part, the driving cover plate device (4) is formed by splicing a plurality of standard strip structure type steel cover plate strips (43), the cover plate strips (43) are connected to form a whole through the hinge pieces (44), and the driving cover plate device (4) is connected with the upper chain (251-1) and the lower chain (252-1) of the cover plate switch auxiliary mechanism (2) through the connecting rod pieces (42), moves in parallel on the support rail (41), and enters the rotating rail (45) along the support rail (41) under the driving of external force.

Images