Portable electric reset device for smoke-proof and fire-proof valve

Abstract

The invention discloses a portable smoke-proof and fire-proof valve electric reset device which comprises an insulating rod, a motor, a control mechanism and a reset mechanism, the insulating rod is telescopic, the motor is installed on the insulating rod, the control mechanism and the reset mechanism are installed at the two ends of the insulating rod respectively, and the control mechanism is used for controlling starting and stopping of the motor; the reset mechanism comprises a limiting piece and a connecting piece, one end of the connecting piece is connected with an output shaft of the motor, and the other end of the connecting piece is provided with a clamping groove in butt joint with the smoke-proof and fire-proof valve reset executing mechanism. One end of the limiting piece is connected with the insulating rod, the other end of the limiting piece is provided with at least two limiting blocks arranged at intervals, the limiting blocks can make contact with or abut against the outer side of the smoke-proof and fire-proof valve, and the motor is used for driving the connecting piece to rotate. The connecting piece is driven to rotate and drive the smoke-proof and fire-proof valve to reset, manual reset can be replaced to achieve the reset effect, meanwhile, the operation risk of maintenance personnel is reduced, and the problem that the smoke-proof and fire-proof valve is difficult to reset due to the fact that the maintenance space of the smoke-proof and fire-proof valve is insufficient is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of smoke and fire damper resetting, and in particular relates to a portable electric resetting device for smoke and fire dampers. Background Art

[0002] At present, the equipment area of ​​subway stations is small, and there may be multiple smoke and fire damper actuators installed against the wall or surrounded by other pipelines. The smoke and fire dampers have insufficient inspection space, making it difficult for maintenance personnel to inspect and reset them, seriously affecting system reliability. In addition, since the subway station air ducts are mainly installed above the ceiling, the smoke and fire dampers installed in conjunction with the air ducts need to be manually reset at a height. In order to cope with the lack of inspection space, maintenance personnel must climb and cross to avoid pipelines, increasing the safety risk of personnel operations.

[0003] There are currently two mainstream methods for resetting smoke and fire dampers. One is that maintenance personnel climb a ladder and manually hold the reset handle to reset it manually. For installation locations above the lifting holes and other situations where there are hidden dangers of working at height, manual reset poses certain operational safety risks, requires a larger operating space, and is inconvenient to operate. Another reset method is to connect the reset mechanism with a wire rope, install a manual reset device in a groove on the wall, use special tools to rotate the reset device, and the transmission mechanism inside the device achieves the effect of manual reset through the tension of the wire rope. However, the installation of the manual reset device requires slotting and pre-buried wire pipes, and the wire rope of the transmission component is a consumable material. It is often prone to aging and breaking in practice, and replacing the wire rope is time-consuming and labor-intensive. At the same time, the use of wire rope reset has high requirements for the installation of the reset mechanism, and it is easy for the installation angle deviation to cause the wire rope to damage the reset mechanism. This reset method is time-consuming and labor-intensive, and requires a larger operating space.

[0004] In addition, the above two smoke and fire damper reset methods cannot cope with the problem of insufficient maintenance space. Therefore, it is urgent to find a simple and efficient reset device to solve the maintenance problem of smoke and fire damper equipment with insufficient maintenance space and improve equipment reliability.

[0005] Therefore, a new technology is needed to solve the problems in the prior art that the smoke and fire dampers are inconvenient to reset and cannot cope with the problem of insufficient maintenance space. Summary of the invention

[0006] In order to solve the above problems in the prior art, the present invention provides a portable electric reset device for smoke and fire dampers, which can be used in situations where there is insufficient maintenance space and has the effects of simple structure, easy operation, high reset efficiency, and safety and reliability.

[0007] The present invention adopts the following technical solutions:

[0008] A portable electric reset device for a smoke-proof and fire-proof damper, comprising an insulating rod, a motor, a control mechanism, and a reset mechanism. The insulating rod is telescopic. The motor is installed on the insulating rod. The control mechanism and the reset mechanism are respectively installed at both ends of the insulating rod. The control mechanism is used to control the start and stop of the motor;

[0009] The reset mechanism includes a limiting member and a connecting member. One end of the connecting member is connected to the output shaft of the motor, and the other end is provided with a card slot for docking with the reset execution mechanism of the smoke-proof and fire-proof damper. One end of the limiting member is connected to the insulating rod, and the other end is provided with a limiting portion. The limiting portion can contact or abut against the outside of the smoke-proof and fire-proof damper. The motor is used to drive the connecting member to rotate. The motor is used to drive the connecting member to rotate.

[0010] As a further improvement of the technical solution of the present invention, the control mechanism includes a controller, a control button, and a power interface. The power interface is arranged on the end face of the insulating rod away from the reset mechanism and is electrically connected to the motor. The control button can protrude from the outer surface of the insulating rod and is electrically connected to the controller. The controller is installed inside the insulating rod and can control the start and stop of the motor.

[0011] As a further improvement of the technical solution of the present invention, it further includes a fixing bracket. The fixing bracket is installed at one end of the insulating rod and is used to install the motor.

[0012] As a further improvement of the technical solution of the present invention, the limiting member includes a first limiting block, a connecting block, and a second limiting block that are sequentially connected in a U shape. The first limiting block and the second limiting block form the limiting portion. The connecting block is detachably and fixedly connected to the fixing bracket.

[0013] As a further improvement of the technical solution of the present invention, a groove is provided at one end of the connecting member away from the card slot. The output shaft of the motor is inserted into the groove and is detachably and fixedly connected to the connecting member.

[0014] As a further improvement of the technical solution of the present invention, the fixing bracket includes a first mounting plate and a second mounting plate that are connected to each other in an L shape. The first mounting plate is detachably and fixedly connected to the end face of the insulating rod. The motor is installed on the second mounting plate.

[0015] As a further improvement of the technical solution of the present invention, a rib plate is provided between the first mounting plate and the second mounting plate. The rib plate is used to fixedly connect the first mounting plate and the second mounting plate.

[0016] As a further improvement of the technical solution of the present invention, the output shaft of the motor is perpendicular to the axis of the insulating rod.

[0017] As a further improvement of the technical solution of the present invention, the insulating rod includes a first rod body and a second rod body, both ends of the first rod body are installed with connecting parts, the power interface is located on an end surface of one end of the second rod body, the connecting part is installed on the end of the second rod body away from the power interface, the fixing bracket is detachably fixed to one end of the first rod body, and the other end of the first rod body is detachably fixedly connected to the second rod body through the two connecting parts.

[0018] As a further improvement of the technical solution of the present invention, the insulating rod also includes at least one third rod body located between the first rod body and the second rod body, each of the third rod bodies is connected in sequence to form an extended body, and both ends of each of the third rod bodies are equipped with the connecting parts, and the connecting parts located at both ends of the extended body are respectively detachably fixedly connected to the connecting parts at the ends of the first rod body and the second rod body.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The portable electric reset device for smoke and fire dampers has a simple structure and is easy to carry and use. Through the transmission of the motor output shaft, the connecting part can drive the smoke and fire damper actuator handle fixing part to rotate 90° counterclockwise to reset. It can replace manual reset to achieve a quick reset effect. The smoke and fire damper reset efficiency is high, while reducing the operating risks of maintenance personnel. It is safe and reliable, and solves the problem of difficulty in resetting the smoke and fire damper actuator handle caused by insufficient maintenance space for the smoke and fire damper. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The technology of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0022] Figure 1 It is a schematic diagram of the overall structure of the portable electric reset device for smoke and fire dampers of the present invention when a third rod is provided;

[0023] Figure 2 It is a partial structural schematic diagram of the reset mechanism of the present invention.

[0024] Reference numerals:

[0025] 1-insulating rod; 11-handle part; 12-connecting piece; 13-first rod body; 14-second rod body; 15-third rod body;

[0026] 2- Motor;

[0027] 3-control mechanism; 31-control button; 32-power interface;

[0028] 4-Fix the bracket;

[0029] 5-limiting member; 51-first limiting block; 52-connecting block; 53-second limiting block;

[0030] 6-connecting piece; 61-slot; 62-first protrusion; 63-second protrusion; 64-third protrusion;

[0031] 7-Mobile phone holder;

[0032] 8- Camera;

[0033] 9- External power supply. DETAILED DESCRIPTION

[0034] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the present invention, so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other without conflict. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0035] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature, or it may be indirectly fixed or connected to the other feature. In addition, the descriptions of up, down, left, right, etc. used in the present invention are only relative to the relative positional relationship of the components of the present invention in the drawings.

[0036] Reference Figure 1 to Figure 2 A portable electric reset device for smoke and fire dampers includes an insulating rod 1, a motor 2, a control mechanism 3, and a reset mechanism. The motor 2 can preferably be a forward and reverse motor. The rod body of the insulating rod 1 is made of insulating material. The outer surface of the insulating rod 1 has an insulating effect to avoid the risk of electric shock when the staff holds it. It is safe and reliable. The insulating rod 1 can be telescopic, and the length of the entire telescopic rod can be adjusted to adapt to the installation height of various types of smoke and fire dampers. The motor 2 is installed on the insulating rod 1, and the control mechanism 3 and the reset mechanism are respectively installed at both ends of the insulating rod 1. The control mechanism 3 is used to control the start and stop of the motor 2. Among them, the motor 2 is a 24V DC reduction motor 2, and the insulating rod 1 has an insulating effect.

[0037] The reset mechanism includes a limiter 5 and a coupling 6. One end of the coupling 6 is connected to the output shaft of the motor 2, and the other end is provided with a slot 61 that is connected to the smoke and fire damper reset actuator. One end of the limiter 5 is connected to the insulating rod 1, and the other end is provided with a limiter. When the smoke and fire damper reset actuator is inserted into the slot 61, the limiter can contact or abut the outer side of the smoke and fire damper, and the motor 2 is used to drive the coupling 6 to rotate. Among them, the slot 61 notch faces the side away from the insulating rod 1, and the slot 61 notch is opened at the front end of the coupling 6 to facilitate the clamping of the smoke and fire damper handle, which can ensure that the smoke and fire damper coupling 6 will not fall off the smoke and fire damper handle when the output shaft of the motor 2 rotates.

[0038] The portable electric reset device for smoke and fire dampers of the present invention has a simple structure and is easy to carry and use. Through the transmission of the output shaft of the motor 2, the connecting member 6 can drive the smoke and fire damper actuator handle fixing member to rotate 90° counterclockwise to reset. It can replace manual reset to achieve a quick reset effect, improve the efficiency of the reset operation, and at the same time reduce the operating risks of maintenance personnel, and solve the problem of difficulty in resetting smoke and fire dampers caused by insufficient maintenance space for smoke and fire dampers.

[0039] Specifically, a hand-held part 11 is provided at one end of the insulating rod 1 away from the reset mechanism, and the control mechanism 3 includes a controller, a control button 31 and a power interface 32. The control button 31 and the power interface 32 are both provided on the controller. The power interface 32 is a 24V power interface 32. The power interface 32 is provided on the end surface of the insulating rod 1 away from the reset mechanism and is electrically connected to the motor 2. The control button 31 can protrude from the outer surface of the insulating rod 1 and is electrically connected to the controller. The controller is installed inside the insulating rod 1 and can control the start and stop of the motor 2. The controller surface is provided with three control buttons 31, and the control circuit board and lithium battery pack inside the controller form a control circuit. The power interface 32 on the controller directly provides power for the device or charges the lithium battery pack inside the device.

[0040] Specifically, the portable electric reset device for smoke and fire dampers of the present solution further includes a fixing bracket 4 , which is installed at one end of the insulating rod 1 and is used to install the motor 2 .

[0041] Specifically, the limiting member 5 includes a first limiting block 51, a connecting block 52, and a second limiting block 53 that are sequentially connected to form a U shape. The first limiting block 51 and the second limiting block 53 form the limiting portion. The opening of the U-shaped structure faces away from the fixed bracket, so that the sides of the first limiting block 51 and the second limiting block 53 that are close to each other can contact the smoke-proof and fire-proof valve, avoiding damage to the handle fixing part of the smoke-proof and fire-proof valve actuator docked with the card slot 61 due to the shaking of the insulating rod 1. In addition, the arrangement of the first limiting block 51 and the second limiting block 53 facilitates the docking of the handle fixing part of the smoke-proof and fire-proof valve actuator with the card slot 61, avoiding docking errors, reducing the docking time, and improving the efficiency of the reset operation. The connecting block 52 is detachably and fixedly connected to the fixed bracket 4. There are 2 fixing holes at the front end of the motor 2 for installing the connecting block 52 at the front end of the DC reduction motor 2 by matching with screws. In addition, a camera 8 can be installed on the connecting block 52 of the limiting member 5. The camera 8 can be installed on the side of the connecting block 52 close to the connecting member 6. The image information captured by the camera 8 can be displayed on a display device, so as to facilitate the user to observe, and thus facilitate the docking of the connecting member 6 with the structure to be reset on the fire and smoke prevention valve. A mobile phone or other electronic device with a display screen can be used as the display device. A mobile phone bracket 7 or other mounting brackets for fixing the display device can be installed at one end of the insulating rod 1 close to the hand-held part 11, so as to fix the mobile phone or other display devices. Among them, the image transmission between the display device and the camera 8 can be realized by conventional technical means. During use, the structure to be reset on the fire and smoke prevention valve, such as the handle fixing part of the smoke-proof and fire-proof valve actuator, can be observed through the camera 8, so as to facilitate the reset operation.

[0042] Specifically, a groove is provided at one end of the connecting member 6 away from the card slot 61. The output shaft of the motor 2 is inserted into the groove and is detachably and fixedly connected to the connecting member 6. The output shaft of the motor 2 and the connecting member 6 can be detachably fixed by screws, and the connecting member 6 can rotate synchronously with the output shaft of the motor 2. Through the transmission of the output shaft of the motor 2, the connecting member 6 can rotate counterclockwise by 90°, achieving the purpose of resetting the device and reducing the operation risk of maintenance personnel at the same time. After the smoke-proof and fire-proof valve is reset, the motor 2 can be started to drive the connecting member 6 to rotate clockwise by 90° to return to the original position.

[0043] This device can overcome the shortcomings and deficiencies in the prior art, provide a portable smoke-proof and fire-proof valve reset device, which can replace manual ladder climbing for manual reset and achieve the effect of resetting the smoke-proof and fire-proof valve. At the same time, this device can be used for resetting equipment with insufficient maintenance space where it is difficult for personnel to maintain.

[0044] Specifically, the upper end surface of the coupling 6 is convexly provided with a first protrusion 62, a second protrusion 63 and a third protrusion 64, which are sequentially arranged clockwise around the axis of the coupling and spaced apart, and are used to form the side wall of the slot. In the case of limited space, when the smoke and fire damper actuator handle enters the slot 61, the smoke and fire damper actuator handle fixing member can be smoothly embedded in the gap between any two of the first protrusion 62, the second protrusion 63 and the third protrusion 64, and the first protrusion 62, the second protrusion 63 and the third protrusion 64 can limit the smoke and fire damper actuator handle fixing member in contact therewith, and push the smoke and fire damper actuator handle fixing member to rotate and reset when the coupling 6 rotates. Among them, the axis of the connecting part 6 is coaxially arranged with the axis of the motor 2, and the smoke and fire damper actuator handle fixing part is used to connect the actuator handle with the smoke and fire damper housing. The portable smoke and fire damper electric reset device of this scheme can drive the smoke and fire damper actuator handle to move and reset.

[0045] Specifically, the gap between the first protrusion 62 and the second protrusion 63 is located farthest from the second rod body 14, and the gap between the first protrusion 62 and the third protrusion 64 is located closest to the second rod body 14. A larger gap can be set between the first protrusion 62 and the second protrusion 63, so that the smoke and fire damper actuator handle can pass through the gap between the first protrusion 62 and the second protrusion 63 and be smoothly inserted into the slot 61 in some cases where space is limited.

[0046] Specifically, the fixing bracket 4 includes a first mounting plate and a second mounting plate connected to each other in an L-shape, the first mounting plate is detachably fixedly connected to the end surface of the insulating rod 1, and the fixing bracket 4 is connected to the end of the insulating rod 1 by a metal screw. The motor 2 is mounted on the second mounting plate, and the rear end of the motor 2 has four fixing holes for fitting screws to mount the fixing bracket 4 on the rear end of the motor 2.

[0047] Specifically, a rib is provided between the first mounting plate and the second mounting plate, and the rib is used to fix the first mounting plate and the second mounting plate together.

[0048] Specifically, the output shaft of the motor 2 and the axis of the insulating rod 1 are perpendicular to each other.

[0049] Specifically, the insulating rod 1 includes a first rod body 13 and a second rod body 14 connected to each other, the hand-held part 11 is arranged on the second rod body 14, the control mechanism 3 is installed on the second rod body 14, the power interface 32 is located on one end surface of the second rod body 14, the end of the second rod body 14 away from the power interface 32 is installed with the connecting piece 12, a PCB board is installed in the connecting piece 12, and the power interface 32 and the internal wires can be connected to the connecting piece 12 with a PCB board at the end. Connecting pieces 12 are installed at both ends of the first rod body 13, the fixed bracket 4 in the reset mechanism is detachably fixed to the end of the first rod body 13 away from the second rod body 14, the other end of the first rod body 13 is detachably fixedly connected to the second rod body 14 through the two connecting pieces 12, and the wires inside the first rod body 13 can be connected to the connecting pieces 12 with PCB boards at both ends of the first rod body 13. The power interface 32 is provided at one end of the second rod 14, and is used to supply power to the 24V DC reduction motor 2. The other end of the second rod 14 is provided with a connector 12. The first rod 13 and the second rod 14 are connected and fixed by two connectors 12 at the ends of the connection nodes thereof, and after the two connectors 12 are connected and fixed, the wires inside the corresponding rods can form an electrical path, so that the motor 2 is electrically connected to the power interface 32. The power interface 32 can be connected to an external power source 9, so as to supply power to the motor 2.

[0050] Specifically, the insulating rod 1 also includes at least one third rod 15 located between the first rod 13 and the second rod 14. The third rod 15 can be used to increase the overall length of the insulating rod 1, so as to adapt to the installation height of various types of smoke and fire dampers. Connectors 12 are installed at both ends of each of the third rods 15. The wires inside the third rod 15 can be connected to the connectors 12 with PCB boards at both ends of the third rod 15. The two connectors 12 can be detachably connected and fixed. When the number of the third rods 15 is selected, the two ends of the third rod 15 are detachably fixedly connected to the first rod 13 and the second rod 14, that is, the connectors 12 at both ends of the third rod 15 are detachably fixedly connected to the connectors 12 at the ends of the first rod 13 and the second rod 14, respectively. When the number of the third rod bodies 15 is selected to be two or more, the two or more third rod bodies 15 can be connected in sequence to form an extended body, and the two ends of the extended body are respectively detachably fixedly connected to the first rod body 13 and the second rod body 14, that is, the connecting pieces 12 at the two ends of the extended body are respectively detachably fixedly connected to the connecting pieces 12 at the ends of the first rod body 13 and the second rod body 14.

[0051] A method for using a portable electric reset device for smoke and fire dampers, using the portable electric reset device for smoke and fire dampers as described above, comprises the following steps:

[0052] S1. Connect the first rod body 13 and the second rod body 14 to form the insulating rod 1 as a whole. According to the position or installation height of the smoke and fire dampers, select an appropriate number of third rod bodies 15 to be connected to the first rod body 13 and the second rod body 14 respectively to adjust the overall length of the insulating rod 1 to an appropriate length.

[0053] S2. Extend one end of the insulating rod 1 on which the reset mechanism is installed to the position of the smoke and fire damper, and fit the limiter 5 with the housing of the smoke and fire damper actuator so that the smoke and fire damper actuator handle fixing piece can extend into the slot 61 of the connecting piece 6, so that the connecting piece 6 can clamp or grip the smoke and fire damper actuator handle fixing piece.

[0054] S3. Place the handheld maintenance terminal on the mobile phone holder 7 or other mounting bracket that can fix the display device, and fix it.

[0055] S4. Long press the control button 31, the motor 2 starts, and the connecting piece 6 rotates counterclockwise. Observe the image transmitted back to the handheld terminal by the camera 8 in real time. After the connecting piece 6 rotates 90° counterclockwise, release the control button 31, the motor 2 stops, and confirm the status of the smoke and fire damper. The smoke and fire damper can be reset, and then the smoke and fire damper is separated from the connecting piece 6 and the limit piece 5.

[0056] S5. Short press the control button 31 to start the motor 2. At this time, the connecting member 6 rotates clockwise. After the connecting member 6 rotates 90° clockwise to the original position, release the control button 31 and the motor 2 stops.

[0057] For other contents of the portable electric reset device for smoke and fire dampers described in the present invention, please refer to the prior art and will not be repeated here.

[0058] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A portable electric reset device for smoke and fire dampers, characterized in that: It includes an insulating rod, a motor, a control mechanism, and a reset mechanism. The insulating rod can be telescopic. The motor is installed on the insulating rod. The control mechanism and the reset mechanism are respectively installed at both ends of the insulating rod. The control mechanism is used to control the start and stop of the motor. The reset mechanism includes a limiting member and a connecting member. One end of the connecting member is connected to the output shaft of the motor, and the other end is provided with a card slot for docking with the reset execution mechanism of the smoke-proof and fire-proof valve. One end of the limiting member is connected to the insulating rod, and the other end is provided with a limiting portion. The limiting portion can contact or abut against the outside of the smoke-proof and fire-proof valve. The motor is used to drive the connecting member to rotate.

2. The portable electric reset device for smoke and fire dampers according to claim 1 is characterized in that: The control mechanism includes a controller, a control button, and a power interface. The power interface is arranged on the end face of the insulating rod far from the reset mechanism and is electrically connected to the motor. The control button can protrude from the outer surface of the insulating rod and is electrically connected to the controller. The controller is installed inside the insulating rod and can control the start and stop of the motor.

3. The portable electric reset device for smoke and fire dampers according to claim 2 is characterized in that: It further includes a fixing bracket. The fixing bracket is installed at one end of the insulating rod and is used to install the motor.

4. The portable electric reset device for smoke and fire dampers according to claim 3 is characterized in that: The limiting member includes a first limiting block, a connecting block, and a second limiting block that are sequentially connected to form a U shape. The first limiting block and the second limiting block form the limiting portion. The connecting block is detachably and fixedly connected to the fixing bracket.

5. The portable electric reset device for smoke and fire dampers according to claim 1 is characterized in that: One end of the connecting member far from the card slot is provided with a groove. The output shaft of the motor is inserted into the groove and is detachably and fixedly connected to the connecting member.

6. The portable electric reset device for smoke and fire dampers according to claim 3 is characterized in that: The fixing bracket includes a first mounting plate and a second mounting plate that are connected to form an L shape. The first mounting plate is detachably and fixedly connected to the end face of the insulating rod. The motor is installed on the second mounting plate.

7. The portable electric reset device for smoke and fire dampers according to claim 6 is characterized in that: A rib plate is provided between the first mounting plate and the second mounting plate. The rib plate is used to fixedly connect the first mounting plate and the second mounting plate.

8. The portable electric reset device for smoke and fire dampers according to claim 1 is characterized in that: The output shaft of the motor is perpendicular to the axis of the insulating rod.

9. The portable electric reset device for smoke and fire dampers according to claim 3 is characterized in that: The insulating rod includes a first rod body and a second rod body. Connecting members are installed at both ends of the first rod body. The power interface is located on the end face of one end of the second rod body. A connecting member is installed at the end of the second rod body far from the power interface. The fixing bracket is detachably and fixedly installed at one end of the first rod body. The other end of the first rod body and the second rod body are detachably and fixedly connected by the two connecting members.

10. The portable electric reset device for smoke and fire dampers according to claim 9 is characterized in that: The insulating rod further includes at least one third rod body located between the first rod body and the second rod body. Each of the third rod bodies is sequentially connected to form an extension body. Connecting members are installed at both ends of each of the third rod bodies. The connecting members at both ends of the extension body are respectively detachably and fixedly connected to the connecting members at the ends of the first rod body and the second rod body.

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