A circuit conversion control device for a sealed cabin

Abstract

The utility model discloses a kind of circuit conversion control devices for sealed cabin body.The device includes: cabin body, identification disc, positioning disc, shaft, limit block, spring, clamping plate seat, mounting seat, circuit conversion group, rotating handle, when the device is not operated, the first boss on positioning disc is limited in the first limit slot at one position of identification disc, at this time, by pressing positioning disc, it can make spring compression amount increase, and by rotating handle rotating shaft, so as to drive positioning disc, limit block, clamping plate seat rotate together, when clamping plate seat rotates a certain angle, the suppression of rotating handle to positioning disc is released, under the action of spring, the first boss on positioning disc is limited in the first limit slot at another position of identification disc;The device is simple in structure, ingenious in design, uses the combination form of shaft, spring, clamping plate seat, circuit conversion group, to realize the conversion control of its inner circuit outside sealed cabin body, without the tedious dismounting procedure to sealed cabin body.

Description

Technical Field

[0001] This utility model relates to the field of circuit conversion control technology, and more specifically, to a circuit conversion control device for a sealed chamber. Background Technology

[0002] With the development of modern science and technology, unmanned, large-scale, and intelligent underwater products have become one of the key technologies for research and development units, such as autonomous underwater robots, underwater gliders, and underwater AUVs. These underwater products typically adopt a sealed cabin structure with an internal power source, and the control circuits operate in different on / off states under different working conditions. However, existing technologies mostly use a hatch-type opening operation to switch control circuits. This operation is cumbersome, and frequent removal and installation of the hatch can affect the sealing performance of the cabin, easily leading to accidents such as water leakage and electrical leakage, thereby reducing the safety of the system.

[0003] The existing technology uses a cover-type opening operation to switch control circuits, which requires frequent disassembly and reassembly of the cover, affecting the sealing performance between the cover and the sealed chamber, and easily causing accidents such as water leakage and electrical leakage, thus reducing the safety of the system. There is currently no effective solution to this problem. Utility Model Content

[0004] This utility model provides a circuit switching control device for a sealed chamber to solve the problem that the existing technology uses a cover-opening operation to switch the control circuit, which requires frequent disassembly and reassembly of the cover, affecting the sealing performance between the cover and the sealed chamber, and easily causing accidents such as water leakage and electrical leakage, thus reducing the safety of the system.

[0005] To achieve the above objectives, this utility model provides a circuit switching control device for a sealed chamber. The device includes: a chamber body, with an identification plate for sealing the chamber body disposed on its top; the identification plate has text indicating the circuit serial number, an arrow indicating the circuit switching rotation direction, and a first limiting groove; a positioning plate disposed within the chamber body and below the identification plate; a first boss disposed on the top of the positioning plate for limiting its position within the first limiting groove; a shaft passing through a mounting hole in the positioning plate and connected to the positioning plate; and a positioning block disposed below the positioning plate and fixedly sleeved around the shaft. A spring is sleeved around the shaft, with one end contacting the bottom of the positioning plate and the other end contacting the top of the limiting block; a clamping plate is fixedly connected to the bottom of the shaft, and the clamping plate on the clamping plate is used to control the circuit switching of the circuit switching group; a mounting base is provided inside the mounting base, and the top of the mounting base is fixedly connected to the bottom of the cabin body; a rotating handle is fixedly connected to the top of the shaft and is used to rotate the shaft to control the circuit switching of the circuit switching group; when the shaft is rotated so that the first boss is in the first limiting groove at one of the circuit serial numbers, the circuit corresponding to that circuit serial number is in a closed state.

[0006] Optionally, the circuit conversion group includes: multiple terminal blocks, multiple contact plates, multiple flat contacts, and multiple insulating pads; the multiple terminal blocks, multiple contact plates, and multiple flat contacts correspond one-to-one; the terminal blocks are connected to the contact plates, and the flat contacts are disposed on the contact plates; adjacent two contact plates are separated by insulating pads; when the flat contacts on two adjacent contact plates are in contact, the circuit connected to the corresponding two terminal blocks is in a closed state.

[0007] Optionally, the clamps on the clamp seat are used to pass between two adjacent contact plates.

[0008] Optionally, the main body of the cabin is a hollow cylindrical structure with flanges at both ends. The main body of the cabin includes an upper cabin, a middle cabin, and a lower cabin. The inner diameter of the upper cabin is larger than the inner diameter of the middle cabin. The inner diameter of the middle cabin is larger than the inner diameter of the lower cabin. The positioning plate is disposed in the upper cabin, and a bushing is provided in the middle cabin. The bushing is a hollow cylindrical structure with a flange at one end. The bushing is tightly fitted to the interior of the middle cabin and the exterior of the shaft.

[0009] Optionally, a bearing is provided in the lower compartment; the bearing is in close contact with the interior of the lower compartment and the exterior of the shaft.

[0010] Optionally, the shaft includes an upper section, a middle section, and a lower section; the upper section is located within the upper compartment; the middle section is located within the bushing; the lower section passes through the lower compartment and is located within the mounting base; the limiting block is a hollow cylindrical structure with a flange at one end; the limiting block is located on the periphery of the junction between the upper and middle sections; the inner top of the bushing is tightly fitted to the outer side of the limiting block.

[0011] Optionally, a first sealing ring is provided on the outer side of the bushing and the inner side of the middle compartment; a second sealing ring is provided on the outer side of the middle section and the inner side of the bushing.

[0012] Optionally, the clamp seat is fixedly connected to the bottom of the shaft by a pressure plate and fixing screws.

[0013] Optionally, the top of the cabin body is fixedly connected to the marking plate by a first screw; the bottom of the cabin body is fixedly connected to the top of the mounting base by a second screw.

[0014] Optionally, the rotating handle has a cross-shaped structure; one end of the cross-shaped structure is used to be fixedly connected to the top of the shaft, and the other two ends are used to allow the operator to apply external force to rotate the shaft.

[0015] The beneficial effects of this utility model are:

[0016] This utility model provides a circuit switching control for a sealed chamber. The device has a simple structure and ingenious design. It uses a combination of shaft, spring, clamp seat and circuit switching group to realize the switching control of the internal circuit from the outside of the sealed chamber. It does not require a complicated disassembly and assembly process of the sealed chamber, nor does it require the addition of additional electrical components. It has the advantages of low cost and high reliability. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of a circuit switching control device for a sealed chamber provided in an embodiment of this utility model;

[0018] Figure 2 This is a front view of a circuit switching control device for a sealed chamber provided in an embodiment of this utility model;

[0019] Figure 3 This is a top view of the identification disc provided in this embodiment of the utility model;

[0020] Figure 4 This is a top view of the positioning disk provided in an embodiment of the present utility model;

[0021] Figure 5 This is a cross-sectional view of the shaft provided in an embodiment of this utility model;

[0022] Figure 6This is a front view of the circuit conversion group provided in an embodiment of this utility model;

[0023] Figure 7 This is a side view of the circuit conversion assembly provided in an embodiment of the present invention;

[0024] Figure 8 This is a top view of the clamping base provided in this embodiment of the utility model;

[0025] Figure 9 This is a perspective view of the rotary handle provided in an embodiment of this utility model.

[0026] Symbol explanation:

[0027] 1. Body of the cabin, 2. Marking plate, 3. Positioning plate, 4. Shaft, 5. Limiting block, 6. Spring, 7. Clamping plate seat, 8. Circuit conversion group, 9. Mounting seat, 10. Rotating handle, 11. Bushing, 12. Bearing, 13. First sealing ring, 14. Second sealing ring, 15. Pressure plate, 16. Fixing screw, 17. First boss, 18. First limiting groove, 19. First connecting piece, 20. Second connecting piece, 21. Third connecting piece, 22. First contact piece, 23. Second contact piece, 24. Flat contact, 25. Insulating gasket, 26. Gasket, 27. Connecting screw, 28. First screw, 29. Second screw, 30. Cable, 31. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] This invention provides a circuit switching control device. This device can switch and control the circuits inside the sealed chamber without operating the sealed chamber itself. Figure 1 This is a cross-sectional view of a circuit switching control device for a sealed chamber provided in an embodiment of this utility model; Figure 2 This is a front view of a circuit switching control device for a sealed chamber provided in an embodiment of this utility model; as shown... Figure 1 and Figure 2 As shown, the device includes:

[0030] 1. A cabin body 1, with an identification plate 2 provided on the top of the cabin body 1 for sealing the cabin body 1; the identification plate 2 is provided with text indicating the circuit serial number, an arrow indicating the circuit rotation direction, and a first limiting groove 18;

[0031] The main body 1 is a hollow cylindrical structure with flanges at both ends. The main body 1 includes an upper body, a middle body, and a lower body. The inner diameter of the upper body is larger than that of the middle body. The inner diameter of the middle body is larger than that of the lower body. The top end of the main body 1 is provided with a first threaded hole for connecting with the marking plate 2, and the bottom end of the main body 1 is provided with a second threaded hole for connecting with the mounting base 9.

[0032] An identification plate 2 is provided on the top of the cabin body 1 for sealing the cabin body 1; the top of the cabin body 1 and the identification plate 2 are fixedly connected by a first screw 29 (specifically, the first screw 29 passes through the first threaded hole to achieve a fixed connection between the cabin body 1 and the identification plate 2). Figure 3 This is a top view of the label disk 2 provided in this embodiment of the utility model, as shown below. Figure 3 As shown, the label disk 2 is provided with text indicating the circuit serial number (in an optional embodiment, it is provided with two texts: "Circuit 1" and "Circuit 2") and an arrow indicating the direction of circuit rotation (the arrow between "Circuit 1" and "Circuit 2"), and a first limiting groove 18; in an optional embodiment, there are two first limiting grooves 18, including: a first limiting groove 18 marked with the position of "Circuit 1" and a first limiting groove 18 marked with the position of "Circuit 2".

[0033] A bushing 11 is provided inside the intermediate compartment; the bushing 11 is a hollow cylindrical structure with a flange at one end; the bushing 11 is tightly fitted to the interior of the intermediate compartment; specifically, the outer surface of the bushing 11 is tightly fitted to the inner surface of the intermediate compartment; the bottom surface of the flange-shaped end of the bushing 11 is tightly fitted to the top surface of the intermediate compartment; furthermore, a first sealing ring 13 is provided on the outer side of the bushing 11 and the inner side of the intermediate compartment to achieve the sealing function of the compartment.

[0034] A limiting step for mounting the bearing 12 is provided in the lower compartment for installing the bearing 12; the bearing 12 is tightly fitted to the interior of the lower compartment.

[0035] 2. Positioning disk 3, the positioning disk 3 is disposed inside the cabin body 1 and located below the marking disk 2; a first protrusion 17 is provided on the top of the positioning disk 3 for limiting it within the first limiting groove 18;

[0036] Figure 4 This is a top view of the positioning disk 3 provided in this embodiment of the utility model; as shown Figure 4As shown, the positioning disk 3 has a cylindrical structure and a mounting hole is provided at the center of the positioning disk 3; in an optional embodiment of the present invention, the mounting hole is a square hole; it should be noted that the present invention does not limit the shape of the mounting hole.

[0037] A first protrusion 17 is provided on the top of the positioning disk 3. The first protrusion 17 is a rectangular structure and is used to limit the positioning within the first limiting groove 18.

[0038] When the first protrusion 17 is in the first limiting groove 18 at the "circuit 1" position, circuit 1 is in the on state and circuit 2 is in the off state; when the first protrusion 17 is in the first limiting groove 18 at the "circuit 2" position, circuit 1 is in the off state and circuit 2 is in the on state.

[0039] 3. Shaft 4, passing through the mounting hole of the positioning disk 3, and connected to the positioning disk 3;

[0040] Figure 5 This is a cross-sectional view of shaft 4 provided in an embodiment of this utility model; as shown Figure 5 As shown, the shaft 4 is installed in the mounting hole; the shaft 4 includes an upper section, a middle section and a lower section; the upper section is located in the upper compartment; the middle section is located in the bushing 11; the lower section passes through the lower compartment and is located in the mounting seat 9; in an optional embodiment, the top end of the upper section is a square structure for passing through the mounting hole of the positioning disk 3; the mounting hole is adapted to the upper section of the shaft 4; by rotating the shaft 4, the positioning disk 3 can be rotated, thereby realizing the mechanical positioning of the first boss 17 in the first limiting groove 18 on the marking disk 2.

[0041] The middle section is located inside the bushing 11; the bushing 11 is tightly fitted to the outside of the middle section of the shaft 4. Furthermore, a plurality of rectangular sealing grooves are provided on the outside of the middle section of the shaft 4 for installing the second sealing ring 14, thereby achieving a sealing effect between the inside of the bushing 11 and the outside of the middle section.

[0042] The lower section of the shaft 4 passes through the lower compartment, and the outer surface of the lower section of the shaft 4 inside the lower compartment is in close contact with the bearing 12.

[0043] 4. Limiting block 5, located below the positioning disk 3 and fixedly sleeved around the shaft 4;

[0044] The limiting block 5 is a hollow cylindrical structure with a flange at one end; the limiting block 5 is located on the periphery at the junction of the upper and middle sections; that is, the shaft 4 is sleeved inside the limiting block 5; the inner top of the bushing 11 is tightly fitted to the outer side of the limiting block 5; the bottom of the limiting block 5 is located on the step of the middle section of the shaft 4.

[0045] 5. Spring 6, sleeved around the outer periphery of the shaft 4, with one end in contact with the bottom end of the positioning disk 3 and the other end in contact with the top end of the limiting block 5;

[0046] The flange-shaped end face of the limiting block 5 and the bottom end face of the positioning disk 3 achieve the limiting of the positioning disk 3 by compressing and releasing the spring 6.

[0047] 6. Clamping plate seat 7, which is fixedly connected to the bottom of the shaft 4, and the clamping plate on the clamping plate seat 7 is used to control the circuit switching of the circuit switching group 8;

[0048] Figure 8 This is a top view of the clamping base 7 provided in this embodiment of the utility model; as shown Figure 8 As shown, in an optional embodiment of this utility model, the bottom of the lower section of the shaft 4 outside the lower compartment and located inside the mounting base 9 is fixedly connected to the clamping plate seat 7 by a pressure plate 15 and a fixing screw 16. Specifically, the clamping plate seat 7 has a square hole in the center for the shaft 4 to pass through; that is, the clamping plate seat 7 is sleeved around the shaft 4; the pressure plate 15 is located at the bottom of the clamping plate seat 7, and the fixing screw 16 passes through the pressure plate 15 and connects to the shaft 4, pressing the pressure plate 15 tightly against the clamping plate seat 7.

[0049] A clamping plate extends radially from the clamping plate seat 7 for controlling the circuit switching on the circuit switching assembly 8. The clamping plate on the clamping plate seat 7 is used to control the circuit switching on the circuit switching assembly 8. Figure 6 This is a front view of the circuit conversion group 8 provided in this embodiment of the utility model; Figure 7 This is a side view of the circuit conversion group 8 provided in this embodiment of the utility model; as shown Figure 6 and Figure 7 As shown,

[0050] The circuit conversion group 8 includes: multiple connecting pieces, multiple contact pieces, multiple flat contacts 25, and multiple insulating pads 26; the multiple connecting pieces, multiple contact pieces, and multiple flat contacts 25 correspond one-to-one;

[0051] The terminal block is connected to the contact plate, and the flat contact 25 is disposed on the contact plate; two adjacent contact plates are separated by an insulating pad 26; when the flat contacts 25 on two adjacent contact plates are in contact, the circuit connected to the corresponding two terminal blocks is in the on state.

[0052] The clamp on the clamp seat 7 is used to pass between two adjacent contact plates.

[0053] In an optional embodiment, the circuit conversion group 8 consists of two circuits, the circuit conversion group 8 including: a first terminal piece 19, a second terminal piece 20, a third terminal piece 21, a first contact piece 22, a second contact piece 23, a third contact piece 24, a flat contact 25, an insulating pad 26, a pad 27 and a connecting screw 28.

[0054] Among them, gasket 27, insulating gasket 26, first connecting piece 19, first contact piece 22, insulating gasket 26, second connecting piece 20, second contact piece 23, insulating gasket 26, third connecting piece 21, insulating gasket 26, third contact piece 24, and insulating gasket 26 are stacked sequentially from top to bottom and fixedly connected by connecting screws 28; flat contacts 25 are provided on the first contact piece 22, second contact piece 23, and third contact piece 24;

[0055] When the clamping plate on the clamping plate seat 7 is located between the second contact piece 23 and the third contact piece 24, the flat contact 25 on the first contact piece 22 and the flat contact 25 on the second contact piece 23 are in contact. At this time, circuit 1 connected by the first connecting piece 19 and the second connecting piece 20 is in the on state, and circuit 2 is in the off state. Rotate the clamping plate seat 7 so that the clamping plate on it enters between the first contact piece 22 and the second contact piece 23. At this time, the flat contact 25 on the second contact piece 23 and the flat contact 25 on the third contact piece 24 are in contact. Circuit 2 connected by the second connecting piece 20 and the third connecting piece 21 is in the on state, and circuit 1 is in the off state.

[0056] 7. Mounting base 9, the clamping plate base 7 and the circuit conversion group 8 are disposed in the mounting base 9, and the top of the mounting base 9 is fixedly connected to the bottom of the cabin body 1;

[0057] The mounting base 9 is a cylindrical structure with a flange at one end; the clamping plate 7 and the circuit conversion group 8 are located inside the mounting base 9; the top of the mounting base 9 is fixedly connected to the bottom of the cabin body 1 by a second screw 30 (specifically, the second screw 30 passes through the second threaded hole to achieve a fixed connection between the cabin body 1 and the mounting base 9).

[0058] In this circuit, the key component cable 31 passes through the mounting base 9.

[0059] 8. Rotate handle 10, which is fixedly connected to the top of the shaft 4, and is used to rotate the shaft 4 to control the circuit conversion of the circuit conversion group 8; when the shaft 4 is rotated so that the first boss 17 is in the first limiting groove 18 at one of the circuit number positions, the circuit corresponding to the circuit number is in a closed state.

[0060] Figure 9 This is a perspective view of the rotating handle 10 provided in this embodiment of the utility model, as shown below. Figure 9 As shown,

[0061] The rotating handle 10 has a cross-shaped structure; two ends of the cross-shaped structure are used to be fixedly connected to the top of the shaft 4, and the other two ends are used to allow the operator to apply external force.

[0062] In an optional embodiment of this utility model, one end of the rotating handle 10 is a square hollow structure, which is used to fit the top end (square structure) of the shaft 4, and the other two ends are cylindrical sections, which are used as handles to meet the torque required for the rotation of the shaft 4.

[0063] The following details the implementation process of using this device to control the switching of electrical circuits within the cabin:

[0064] 1. The first protrusion 17 on the top of the positioning disk 3 is limited within the first limiting groove 18, which is marked as "Circuit 1" on the label disk 2;

[0065] Insert the end of the rotating handle 10 with the square hollow structure into the top of the shaft 4, and press down on the positioning disk 3. The compression of the spring 6 increases. When the first protrusion 17 on the positioning disk 3 is released from its limit, rotate the shaft 4 (specifically, rotate the shaft 4 through the rotating handle 10) according to the direction indicated by the arrow on the label disk 2 (from "Circuit 1" to "Circuit 2"). This will drive the positioning disk 3, the limit block 5, and the clamp seat 7 to rotate together. After rotating a certain angle, release the pressure of the rotating handle 10 on the positioning disk 3. Under the action of the spring 6, the first protrusion 17 on the top of the positioning disk 3 enters the first limit groove 18 at the "Circuit 2" position on the label disk 2 and is limited. At this time, circuit 1 is disconnected and circuit 2 is connected, completing the switching control between the connected states of circuit 1 and circuit 2.

[0066] 2. The first protrusion 17 on the top of the positioning disk 3 is limited within the first limiting groove 18, which is marked as "Circuit 2" on the label disk 2;

[0067] Insert the end of the rotating handle 10 with the square hollow structure into the top of the shaft 4, and press down on the positioning disk 3. The compression of the spring 6 increases. When the first protrusion 17 on the positioning disk 3 is released from its limit, rotate the shaft 4 (specifically, rotate the shaft 4 through the rotating handle 10) according to the direction indicated by the arrow on the label disk 2 (from "Circuit 2" to "Circuit 1"). This will drive the positioning disk 3, the limit block 5, and the clamp seat 7 to rotate together. After rotating a certain angle, release the pressure of the rotating handle 10 on the positioning disk 3. Under the action of the spring 6, the first protrusion 17 on the top of the positioning disk 3 enters the first limit groove 18 at the "Circuit 1" position on the label disk 2 and is limited. At this time, circuit 2 is disconnected and circuit 1 is connected, completing the switching control between the connected states of circuit 2 and circuit 1.

[0068] The beneficial effects of this utility model are:

[0069] This utility model provides a circuit switching control for a sealed chamber. The device has a simple structure and ingenious design. It uses the combination of shaft 4, spring 6, clamp seat 7 and circuit switching group 8 to realize the switching control of the internal circuit from the outside of the sealed chamber. It does not require cumbersome disassembly and assembly of the sealed chamber, nor does it require the addition of additional electrical components. It has the advantages of low cost and high reliability.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A circuit switching control device for a sealed chamber, characterized in that, include: The cabin body has an identification plate for sealing the cabin body on its top; the identification plate has text indicating the circuit serial number, arrows indicating the circuit rotation direction, and a first limiting groove. A positioning plate is disposed within the body of the cabin and located below the marking plate; a first protrusion is provided on the top of the positioning plate for limiting its position within the first limiting groove; A shaft passes through the mounting hole of the positioning disk and is connected to the positioning disk; A limiting block is provided under the positioning plate and fixedly sleeved around the shaft; A spring is sleeved around the shaft, with one end in contact with the bottom end of the positioning plate and the other end in contact with the top end of the limiting block. A clamping plate seat is fixedly connected to the bottom of the shaft, and the clamping plate on the clamping plate seat is used to control the circuit switching of the circuit switching group; Mounting base, the clamping plate base and the circuit conversion assembly are disposed in the mounting base, and the top of the mounting base is fixedly connected to the bottom of the cabin body; A rotating handle, fixedly connected to the top of the shaft, is used to rotate the shaft to control the circuit switching of the circuit switching group; when the shaft is rotated so that the first boss is in the first limiting groove at one of the circuit number positions, the circuit corresponding to that circuit number is in a closed state.

2. The apparatus according to claim 1, characterized in that: The circuit conversion group includes: multiple connecting pieces, multiple contact pieces, multiple flat contacts, and multiple insulating pads; the multiple connecting pieces, multiple contact pieces, and multiple flat contacts correspond one-to-one; The terminal block is connected to the contact plate, and the flat contact is provided on the contact plate; two adjacent contact plates are separated by an insulating pad; when the flat contacts on two adjacent contact plates are in contact, the circuit connected to the corresponding two terminal blocks is in the on state.

3. The apparatus according to claim 2, characterized in that: The clamps on the clamp seat are used to pass between two adjacent contact plates.

4. The apparatus according to claim 1, characterized in that: The main body of the cabin is a hollow cylindrical structure with flanges at both ends. The main body of the cabin includes an upper cabin, a middle cabin, and a lower cabin. The inner diameter of the upper cabin is larger than the inner diameter of the middle cabin. The inner diameter of the middle cabin is larger than the inner diameter of the lower cabin. The positioning disk is located in the upper compartment, and a bushing is provided in the middle compartment; the bushing is a hollow cylindrical structure with a flange at one end; the bushing is tightly fitted to the interior of the middle compartment and the exterior of the shaft.

5. The apparatus according to claim 3, characterized in that: A bearing is provided in the lower compartment; the bearing is in close contact with the interior of the lower compartment and the exterior of the shaft.

6. The apparatus according to claim 4, characterized in that: The shaft includes an upper section, a middle section, and a lower section; the upper section is located within the upper compartment; the middle section is located within the bushing; and the lower section passes through the lower compartment and is located within the mounting base. The limiting block is a hollow cylindrical structure with a flange at one end; the limiting block is located on the periphery at the junction of the upper and middle sections; the inner top of the bushing is in close contact with the outer side of the limiting block.

7. The apparatus according to claim 6, characterized in that: A first sealing ring is provided on the outer side of the bushing and the inner side of the middle compartment; A second sealing ring is provided on the outer side of the middle section and the inner side of the bushing.

8. The apparatus according to claim 1, characterized in that: The clamping plate is fixedly connected to the bottom of the shaft by pressure plates and fixing screws.

9. The apparatus according to claim 1, characterized in that: The top of the cabin body is fixedly connected to the marking plate by the first screw; The bottom of the cabin body is fixedly connected to the top of the mounting base by a second screw.

10. The apparatus according to claim 1, characterized in that: The rotating handle has a cross-shaped structure; two ends of the cross-shaped structure are used to be fixedly connected to the top of the shaft, and the other two ends are used to allow the operator to apply external force to rotate the shaft.

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