Underwater vehicle battery pack quick disassembly and assembly mechanism with gravity center adjusting capability

Abstract

The invention relates to an underwater vehicle, in particular to an underwater vehicle battery pack quick disassembly and assembly mechanism with gravity center adjusting capacity, which belongs to the field of novel marine vehicles and comprises a pressure-resistant sealing structure, a supporting structure, a battery pack rotary insertion moving mechanism and a displacement detection device. According to the battery pack rotary insertion moving mechanism, on one hand, linear displacement of the battery pack can be achieved through a motor lead screw, so that the gravity center of the underwater vehicle is changed, the posture of the underwater vehicle is changed under the condition that no rudder exists, head raising or head lowering is conducted, and therefore maneuverability is improved; and on the other hand, through the rotary insertion mechanism, the battery pack can be quickly disassembled and assembled, and the steps and time required for replacing the battery pack are greatly simplified and reduced.

Description

Technical Field

[0001] The invention relates to an underwater vehicle, in particular to a quick disassembly and assembly mechanism for a battery pack of an underwater vehicle with the ability to adjust the center of gravity, and belongs to the field of underwater vehicles. Background Art

[0002] As one of the most commonly used underwater mobile observation platforms, underwater vehicles have developed rapidly in recent years with the proposal and implementation of the strategy of building a strong maritime nation. In terms of energy drive, battery packs are currently one of the main energy sources for underwater vehicles.

[0003] In order to adapt to the complex underwater environment, underwater vehicles need to consider requirements such as waterproofing, high pressure, and multi-functional adaptation, which usually leads to a more complex structure of the underwater vehicle, making the replacement of the battery pack more troublesome. At the same time, in order to improve the maneuverability of diving and surfacing, some underwater vehicles currently design fixed battery packs to be movable, thereby adjusting the center of gravity and improving maneuverability; some current research on rapid battery replacement mainly focuses on the rapid replacement of fixed batteries, but lacks research on the rapid replacement of mobile batteries. At the same time, current research focuses on battery replacement in shallow water layers, but does not consider the impact and damage caused by deep water pressure. For example, the invention patent with publication number CN114361691A, "A Rapid Disassembly and Assembly Structure for Underwater Robot Batteries", discloses a rapid disassembly and assembly structure for underwater robot batteries, including a rotating block, a battery fixing block, and a rotating block. Device, side fixing block, battery assembly, bottom fixing block, water leakage detection device, positioning card slot, fixing card slot, etc.; the rotating block drives the rotating chuck on the battery fixing device to rotate and clamp the fixing plate on the battery assembly to complete the battery fixation, and other components position and limit the battery; the water leakage detection device is designed to be when water enters the interior, the water flows through the perforated plate into the detection shell, the highly absorbent resin expands rapidly when it encounters water and pushes the top cover plate to the left, the top cover plate pushes the push plate, the first contact is disconnected from the second contact, when too much water enters, the two sets of contacts are all disconnected, the entire circuit will be disconnected, so that the internal structure is effectively protected. This patent improves the efficiency of fast disassembly and assembly of fixed batteries, but does not consider how the battery withstands pressure, and is not suitable for the rapid replacement of mobile batteries, so it is urgent to supplement the relevant technology. Summary of the invention

[0004] The purpose of the present invention is to provide a rapid disassembly and assembly mechanism for an underwater vehicle battery pack with the ability to adjust the center of gravity. The invention can realize rapid disassembly, assembly and replacement of the battery pack while adjusting the center of gravity, and is adaptable to more complex deep-sea environments.

[0005] In view of the above-mentioned technical problems, the technical solution adopted by the present invention is: a rapid disassembly and assembly mechanism of the battery pack of an underwater vehicle with the ability to adjust the center of gravity, including a pressure-resistant sealing structure, a supporting structure, a battery pack rotating and plugging moving mechanism and a displacement detection device; the supporting structure is connected to the pressure-resistant shell in the pressure-resistant sealing structure through the front baffle and the rear baffle; the battery pack rotating and plugging moving mechanism installs the motor screw on the rear baffle through the motor fixing seat, and the linear displacement of the battery pack can be achieved through the motor screw, thereby achieving the center of gravity adjustment of the underwater vehicle and improving the maneuverability; the rotating and plugging mechanism and the mobile battery pack structure in the battery pack rotating and plugging mechanism are sleeved on the square rail, and the battery pack can be quickly disassembled and assembled by rotating the mobile battery pack structure and cooperating with the rotating and plugging mechanism, which greatly simplifies and reduces the steps and time required for replacing the battery pack, and helps to directly salvage and replace the battery when the underwater vehicle is exhausted, and then go into the water again, thereby improving the efficiency of the operation; the bracket in the displacement detection device is assembled with the hole below the rear baffle to support the displacement detection device.

[0006] The pressure-resistant sealing mechanism also includes a front pressure-resistant head, a rear pressure-resistant head, M bolts and O-rings; the O-rings are respectively installed in the grooves of the front pressure-resistant head and the rear pressure-resistant head, and then the front pressure-resistant head and the rear pressure-resistant head are connected to the front and rear ends of the pressure-resistant shell, and finally fixed with M bolts; the O-ring plays a waterproof role, and the combination of the front pressure-resistant head, the pressure-resistant shell and the rear pressure-resistant head plays a pressure-resistant role to adapt to the high-pressure environment of the deep sea, thereby protecting the internal structure.

[0007] The supporting structure also includes a stop rod, a wiring tube, a first square rail clamp, a second square rail clamp, an M fixing bolt, a square rail connector, a hole retaining spring, an axle retaining spring and a bearing; the stop rod passes through the hole above the rear baffle, and the two are connected by bolts; the wiring tube passes through the stop rod, with one end pressing against the rear end of the stop rod and the other end pressing against the front baffle. The function of the wiring tube is to arrange the cables required at the front and rear; the round shaft end of the square rail connector is assembled with the inner ring of the bearing, and then the axle retaining spring is installed to axially fix the inner ring of the bearing, and the three are installed together into the center hole of the rear baffle in the next step. , and finally, the hole is installed to use a retaining ring to axially fix the outer ring of the bearing; the slotted end of the square rail is connected to the square end of the square rail connector, and the first square rail clamp and the second square rail clamp are further assembled so that the cylinder between the two is inserted into the round hole on the square rail and the square rail connector, and finally the first square rail clamp and the second square rail clamp are fixed with bolts to complete the fixation of one end of the square rail; the other end of the square rail is assembled with the square boss in the center of the front baffle, and the two are fixed with M fixing bolts; the supporting structure is used to support the battery pack rotation and insertion moving mechanism and the displacement detection device as a whole.

[0008] The battery pack rotation and insertion movement mechanism includes a motor screw translation mechanism, a rotation and insertion mechanism and a mobile battery pack structure; the motor screw translation mechanism also includes a screw nut, which is assembled with the screw part of the motor screw through an internal thread, and the two sides of the screw nut cooperate with the groove part of the square rail. When the motor screw rotates, the groove part of the square rail limits the rotation of the screw nut, thereby causing the screw nut to move in a straight line, driving the battery pack to move and adjust the center of gravity.

[0009] The rotary plug mechanism comprises a rotary plug follower, a rotary plug fixing member and a spring; the rotary plug follower is fixed to the lead screw nut by a bolt; the raised portion with a groove of the rotary plug follower is aligned with the notch of the raised slide rail portion behind the rotary plug fixing member, and after the slide rail and the groove portion are aligned, the rotary plug follower is rotated to make the groove rotate into the slide rail of the rotary plug fixing member; the portion with a hole above the rotary plug fixing member cooperates with the anti-rotation rod to prevent it from rotating.

[0010] The mobile battery pack structure also includes a rotary plug-in active component; the rotary plug-in active component is fixed to the battery pack by bolts; the convex portion of the rotary plug-in active component is aligned with the concave portion of the rotary plug-in driven component, and then inserted and rotated so that the two are stuck, thereby fixing the mobile battery pack structure; one end of the spring supports the rotary plug-in driven component, and the other end supports the rotary plug-in active component, eliminating the matching clearance between the rotary plug-in driven component, the rotary plug-in fixing component and the rotary plug-in active component, ensuring that there is no shaking between the three.

[0011] The displacement detection device also includes a displacement sensor and a locking nut; the displacement sensor passes through the bracket and fixes the displacement sensor body by the locking nut; the movable push rod part of the displacement sensor is pressed against the support foot extending from the bottom of the rotary plug fixing part; when the lead screw nut moves linearly, driving the rotary plug follower, the rotary plug fixing part, the rotary plug active part and the battery pack to move together, the length of the extended push rod part of the displacement sensor also changes accordingly, thereby detecting displacement.

[0012] Compared with the prior art, the underwater vehicle battery pack quick disassembly and assembly mechanism with center of gravity adjustment capability of the present invention has the following beneficial effects: the present invention combines the linear movement of the battery pack with the quick disassembly and assembly of the battery pack; it can not only achieve the center of gravity adjustment of the underwater vehicle and improve the maneuverability, but also perform the quick disassembly and assembly of the battery pack and improve the replacement efficiency; at the same time, it takes into account the pressure resistance requirements of the battery pack and increases the applicable depth of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0014] Figure 2 It is a schematic diagram of the pressure-resistant sealing structure of the present invention;

[0015] Figure 3 It is a cross-sectional view of the pressure-resistant sealing structure of the present invention;

[0016] Figure 4 The supporting structure of the present invention is shown in FIG. Figure 1 ;

[0017] Figure 5 The supporting structure of the present invention is shown in FIG. Figure 2 ;

[0018] Figure 6 A is a partial enlarged schematic diagram of the support structure of the present invention;

[0019] Figure 7 A partial enlarged schematic diagram B of the support structure of the present invention;

[0020] Figure 8 It is a schematic diagram of a square rail clamp of the present invention;

[0021] Fig. 9 It is a schematic diagram of the battery pack rotation and insertion movement mechanism of the present invention;

[0022] Fig.10 It is a schematic diagram of the motor screw translation mechanism of the present invention;

[0023] Fig.11 It is a schematic diagram of the rotary insertion mechanism of the present invention;

[0024] Fig.12 It is a schematic diagram of the structure of the mobile battery pack of the present invention;

[0025] Fig.13 It is an assembly cross-sectional view of the rotation and insertion mechanism and the mobile battery pack structure;

[0026] Fig.14 is a schematic diagram of a displacement detection device;

[0027] Fig.15 This is a diagram for disassembling and assembling the battery pack.

[0028] In the above figure: 1-pressure-resistant sealing structure; 2-support structure; 3-battery pack rotation and insertion moving mechanism; 4-displacement detection device; 101-front pressure-resistant head; 102-pressure-resistant shell; 103-rear pressure-resistant head; 104-M4 bolt; 105-O-ring; 201-front baffle; 202-square rail; 203-rear baffle; 204-stop rod; 205-wiring tube; 206-first square rail clamp; 207-second square rail clamp; 208-M5 fixing bolt; 209-square rail connector; 210-hole clamp Spring; 211-shaft retaining spring; 212-bearing; 301-motor screw translation mechanism; 302-screw mechanism; 303-mobile battery pack structure; 30101-motor screw; 30102-motor fixing seat; 30103-screw nut; 30201-screw follower; 30202-screw fixing; 30203-spring; 30301-screw active part; 30302-battery pack; 401-displacement sensor; 402-bracket; 403-locking nut; C-battery pack disassembly and assembly tool. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0030] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0031] like Figure 1-Figure 14 As shown, a rapid disassembly and assembly mechanism of a battery pack for an underwater vehicle with the ability to adjust the center of gravity comprises a pressure-resistant sealing structure 1, a support structure 2, a battery pack rotation and insertion moving mechanism 3 and a displacement detection device 4; the support structure 2 is connected to a pressure-resistant shell 102 in the pressure-resistant sealing structure 1 through a front baffle 201 and a rear baffle 203; the battery pack rotation and insertion moving mechanism 3 installs a motor screw 30101 on the rear baffle 203 through a motor fixing seat 30102, and the motor screw 30101 can realize linear displacement of the battery pack, thereby realizing the center of gravity of the underwater vehicle. Adjustment to improve mobility; the rotation and insertion mechanism 302 and the mobile battery pack structure 303 in the battery pack rotation and insertion mechanism 3 are sleeved on the square rail 202, and the battery pack 30302 can be quickly disassembled and assembled by rotating the mobile battery pack structure 303 in cooperation with the rotation and insertion mechanism, which greatly simplifies and reduces the steps and time required for replacing the battery pack, and helps to directly salvage and replace the battery when the underwater vehicle is exhausted, and then go into the water again, thereby improving the efficiency of the operation; the bracket 402 in the displacement detection device 4 is assembled with the hole below the rear baffle 203 to support the displacement detection device 4;

[0032] like Figure 2 and Figure 3 As shown, the pressure-resistant sealing mechanism 1 also includes a front pressure-resistant head 101, a rear pressure-resistant head 103, an M4 bolt 104 and an O-ring 105; the O-ring 105 is respectively installed in the grooves of the front pressure-resistant head 101 and the rear pressure-resistant head 103, and then the front pressure-resistant head 101 and the rear pressure-resistant head 103 are connected to the front and rear ends of the pressure-resistant shell 102, and finally fixed with the M4 bolt 104; the O-ring 105 plays a waterproof role, and the combination of the front pressure-resistant head 101, the pressure-resistant shell 102 and the rear pressure-resistant head 103 plays a pressure-resistant role to adapt to the high-pressure environment of the deep sea, thereby protecting the internal structure.

[0033] like Figure 4-Figure 8 As shown, the support structure 2 also includes a stop rod 204, a wiring tube 205, a first square rail clamp 206, a second square rail clamp 207, an M5 fixing bolt 208, a square rail connector 209, a hole retaining spring 210, an axis retaining spring 211 and a bearing 212; the stop rod 204 passes through the hole above the rear baffle 203, and the two are connected by bolts; the wiring tube 205 passes through the stop rod 204, one end of which is pressed against the rear end of the stop rod 201, and the other end is pressed against the front baffle 201. The function of the wiring tube 205 is to arrange the cables required at the front and rear; the round shaft end of the square rail connector 209 is assembled with the inner ring of the bearing 212, and then the axis retaining spring 211 is installed to axially fix the inner ring of the bearing 212. The next step is to assemble the three together. Insert it into the center hole of the rear baffle 203, and finally install the retaining spring 210 into the hole to axially fix the outer ring of the bearing 212; the slotted end of the square rail 202 is connected to the square end of the square rail connector 209, and further assemble the first square rail clamp 206 and the second square rail clamp 207 so that the cylinder in the middle of the two is inserted into the round holes on the square rail 202 and the square rail connector 209, and finally fix the first square rail clamp 206 and the second square rail clamp 207 with bolts to complete the fixation of one end of the square rail 202; the other end of the square rail 202 is assembled with the square boss in the center of the front baffle 201, and the two are fixed with M5 fixing bolts 208; the support structure 2 is used to support the battery pack rotation and insertion moving mechanism 3 and the displacement detection device 4 as a whole.

[0034] like Fig. 9 , Fig.10 , Fig.11 , Fig.12 , Fig.13As shown, the battery pack rotation and insertion moving mechanism 3 includes a motor screw translation mechanism 301, a rotation and insertion mechanism 302 and a mobile battery pack structure 303; the motor screw translation mechanism 301 also includes a screw nut 30103, which is assembled with the screw part of the motor screw 30101 through an internal thread, and the two sides of the screw nut 30103 cooperate with the groove part of the square rail 202. When the motor screw 30101 rotates, the groove part of the square rail 202 limits the rotation of the screw nut 30103, thereby causing the screw nut 30103 to move in a straight line, driving the battery pack 30302 to move and adjust the center of gravity.

[0035] like Fig.11 As shown, the rotary plug mechanism 302 includes a rotary plug follower 30201, a rotary plug fixing member 30202 and a spring 30203; the rotary plug follower 30201 is fixed to the screw nut 30103 by bolts; the raised portion with a groove of the rotary plug follower 30201 is aligned with the notch of the raised slide rail portion behind the rotary plug fixing member 30202, and after the slide rail and the groove portion are aligned, the rotary plug follower 30201 is rotated to make the groove screw into the slide rail of the rotary plug fixing member 30202; the portion with a hole above the rotary plug fixing member 30202 cooperates with the anti-rotation rod 204 to prevent it from rotating.

[0036] like Fig.12 , Fig.13 As shown, the mobile battery pack structure 303 also includes a rotary active component 30301; the rotary active component 30301 is fixed to the battery pack 30302 by bolts; the raised portion of the rotary active component 30301 is aligned with the recessed portion of the rotary follower 30201, and then inserted and rotated to make the two jammed, thereby fixing the mobile battery pack structure 303; one end of the spring 30203 supports the rotary follower 30201, and the other end supports the rotary active component 30301, eliminating the matching clearance among the rotary follower 30201, the rotary fixing component 30202 and the rotary active component 30301, to ensure that there is no shaking among the three.

[0037] like Fig.14 As shown, the displacement detection device 4 also includes a displacement sensor 401 and a locking nut 403; the displacement sensor 401 passes through the bracket 402, and the displacement sensor 401 body is fixed by the locking nut 403; the movable top rod part of the displacement sensor 401 is pressed against the support leg extending from the bottom of the rotary plug fixing part 30202; when the lead screw nut 30103 moves linearly, driving the rotary plug driven part 30201, the rotary plug fixing part 30202, the rotary plug active part 30301 and the battery pack 30302 to move together, the length of the extended top rod part of the displacement sensor 401 also changes accordingly, thereby detecting displacement;

[0038] Working principle of the present invention: When replacing, only the front pressure-resistant head 101, the front baffle 201, the M4 bolts 104, the M5 fixing bolts 208 and the mobile battery pack structure 303 need to be disassembled and assembled, and the rest does not need to be disassembled and assembled;

[0039] When removing the battery pack, first remove the M4 bolts 104 fixing the front pressure-resistant head 101 and the pressure-resistant shell 102, remove the front pressure-resistant head 101, then remove the M5 fixing bolts 208, take out the front baffle 201, and finally use the dedicated battery pack disassembly tool C to clamp the battery pack 30302, and drive the entire mobile battery pack structure 303 to rotate 45 degrees counterclockwise, as shown in FIG. Fig.15 As shown, when the raised portion of the active member 30301 to be rotated and inserted is aligned with the concave portion of the driven member 30201, the active member 30301 is supported by the spring 30203, and finally the mobile battery pack structure 303 is completely pulled out of the square rail 202 using the battery pack disassembly tool C, completing the entire disassembly process. The process of installing the battery pack is the opposite of the process of removing the battery pack.

[0040] The present invention is not limited to the above-mentioned specific implementation modes. Various changes made by technicians in the relevant technical field based on the above-mentioned conception without creative work all fall within the protection scope of the present invention.

Claims

1. A quick disassembly and assembly mechanism for an underwater vehicle battery pack with center of gravity adjustment capability, characterized in that: The invention comprises a pressure-resistant sealing structure (1), a supporting structure (2), a battery pack rotational insertion moving mechanism (3) and a displacement detection device (4); the supporting structure (2) is connected to a pressure-resistant shell (102) in the pressure-resistant sealing structure (1) via a front baffle (201) and a rear baffle (203); the battery pack rotational insertion moving mechanism (3) installs a motor screw (30101) on the rear baffle (203) via a motor fixing seat (30102), and the motor screw (30101) can realize linear displacement of the battery pack and adjustment of the center of gravity of the underwater vehicle; the rotational insertion mechanism (302) and the mobile battery pack structure (303) in the battery pack rotational insertion mechanism (3) are sleeved on a square rail (202), and the battery pack (30302) can be disassembled and assembled by rotating the mobile battery pack structure (303) in cooperation with the rotational insertion mechanism (302).

2. The underwater vehicle battery pack quick disassembly and assembly mechanism with center of gravity adjustment capability according to claim 1, characterized in that: The battery pack rotation and insertion movement mechanism (3) comprises a motor lead screw translation mechanism (301), a rotation and insertion mechanism (302) and a mobile battery pack structure (303); the motor lead screw translation mechanism (301) further comprises a lead screw nut (30103), the lead screw nut (30103) is assembled with the lead screw part of the motor lead screw (30101) through an internal thread, and the two sides of the lead screw nut (30103) are matched with the groove part of the square rail (202). When the motor lead screw (30101) rotates, the groove part of the square rail (202) limits the rotation of the lead screw nut (30103), thereby causing the lead screw nut (30103) to move in a straight line, driving the battery pack (30302) to move and adjust the center of gravity.

3. The underwater vehicle battery pack quick disassembly and assembly mechanism with center of gravity adjustment capability according to claim 2, characterized in that: The rotary plug mechanism (302) comprises a rotary plug follower (30201), a rotary plug fixing member (30202) and a spring (30203); the rotary plug follower (30201) is fixed to the lead screw nut (30103) by means of a bolt; the protruding portion with a groove of the rotary plug follower (30201) is aligned with the notch of the protruding slide rail portion behind the rotary plug fixing member (30202); after the slide rail and the groove portion are aligned, the rotary plug follower (30201) is rotated to make the groove rotate into the slide rail of the rotary plug fixing member (30202); the portion with a hole above the rotary plug fixing member (30202) cooperates with the anti-rotation rod (204) to prevent it from rotating.

4. The underwater vehicle battery pack quick disassembly and assembly mechanism with center of gravity adjustment capability according to claim 3, characterized in that: The mobile battery pack structure (303) further comprises a rotary plug active member (30301); the rotary plug active member (30301) is fixed to the battery pack (30302) by means of bolts; the raised portion of the rotary plug active member (30301) is aligned with the recessed portion of the rotary plug driven member (30201), and the two are locked by insertion and rotation, thereby fixing the mobile battery pack structure (303); one end of the spring (30203) supports the rotary plug driven member (30201), and the other end supports the rotary plug active member (30301), thereby eliminating the matching clearance among the rotary plug driven member (30201), the rotary plug fixing member (30202) and the rotary plug active member (30301).

5. The underwater vehicle battery pack quick disassembly and assembly mechanism with center of gravity adjustment capability according to claim 1, characterized in that: The pressure-resistant sealing mechanism (1) further comprises a front pressure-resistant head (101), a rear pressure-resistant head (103), bolts (104) and an O-ring (105); the O-ring (105) is respectively installed in the grooves of the front pressure-resistant head (101) and the rear pressure-resistant head (103), and the front pressure-resistant head (101) and the rear pressure-resistant head (103) are connected to the front and rear ends of the pressure-resistant shell (102) and fixed by bolts (104).

6. The underwater vehicle battery pack quick disassembly and assembly mechanism with center of gravity adjustment capability according to claim 1, characterized in that: The support structure (2) further comprises a stop rod (204), a wiring tube (205), a first square rail clamp (206), a second square rail clamp (207), an M5 fixing bolt (208), a square rail connector (209), a hole retaining spring (210), an axle retaining spring (211) and a bearing (212); the stop rod (204) passes through a hole above the rear baffle (203), and the two are connected by bolts; the wiring tube (205) passes through the stop rod (204), one end of which is pressed against the rear end of the stop rod (201), and the other end of which is pressed against the front baffle (201); the function of the wiring tube (205) is to arrange the cables required at the front and rear; the round shaft end of the square rail connector (209) is assembled with the inner ring of the bearing (212) and the axle retaining spring (211) is installed to axially fix the inner ring of the bearing (212) The square rail (202) is fixed and installed in the center hole of the rear baffle (203), and the outer ring of the bearing (212) is axially fixed by a retaining spring (210) in the installation hole; the slotted end of the square rail (202) is connected to the square end of the square rail connecting member (209), and the first square rail clamp (206) and the second square rail clamp (207) are assembled so that the cylinder between the two is clamped into the circular hole on the square rail (202) and the square rail connecting member (209), and the first square rail clamp (206) and the second square rail clamp (207) are fixed by bolts to complete the fixation of one end of the square rail (202); the other end of the square rail (202) is assembled with the square boss in the center of the front baffle (201), and the two are fixed by fixing bolts (208); the support structure (2) is used to support the battery pack rotation and insertion moving mechanism (3) and the displacement detection device (4).

7. The underwater vehicle battery pack quick disassembly and assembly mechanism with center of gravity adjustment capability according to claim 3, characterized in that: The displacement detection device (4) further comprises a displacement sensor (401) and a locking nut (403); the displacement sensor (401) passes through the bracket (402), and the displacement sensor (401) body is fixed by the locking nut (403); the movable push rod portion of the displacement sensor (401) is pressed against a support leg extending from below the screw-in fixing member (30202).

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