Handheld electric tool used in neutral buoyancy water tank for astronaut

Abstract

The invention provides a handheld electric tool used in an astronaut neutral buoyancy water tank, and relates to the field of electric tools, the handheld electric tool comprises a sectional type sealing machine shell, and a sealing charging module is connected between a grip and a battery box; the upper end of the battery box is provided with a groove, and the groove accommodates and seals the charging module. The circumferential direction of the sealed charging module is fastened to the battery box through a plurality of fasteners; the circumferential direction of the bottom of the grip is fastened to the sealed charging module through a plurality of screws; static sealing rings are respectively arranged at the joints of the sealed charging module and the grip as well as the battery box; an electric connector plug is arranged on the sealing charging module, the grip is connected with an electric connector socket used in cooperation with the electric connector plug, and reliable underwater sealing can still be kept after multiple times of charging. During charging, the fastener at the joint of the grip and the sealed charging module is detached, and the battery power supply electric connector is disconnected for charging. In addition, the sealing charging module can be replaced, and the sealing reliability of the electric tool during the service life is guaranteed.

Description

A handheld power tool used in an astronaut neutral buoyancy tank Technical Field

[0001] This application relates to the field of power tool technology, and more specifically, to a handheld power tool used in an astronaut neutral buoyancy tank. Background Technology

[0002] With the commencement of my country's space station construction, astronauts have conducted numerous extravehicular activities (EVAs) to complete various extravehicular operations. Each flight crew undergoes multiple training sessions on the ground before their mission, practicing the use of relevant EVA tools and equipment, and rehearsing mission procedures. Space-based on-orbit maintenance power tools are handheld electromechanical devices used by astronauts during EVAs to install and replace fasteners for extravehicular equipment. These tools have been used extensively in my country's various EVA missions and are therefore essential tools that every astronaut must master. The training for astronauts on using EVA tools before conducting EVAs is mainly divided into two types: suspension training and underwater training. Suspension training generally allows the operation of real tools to simulate some delicate maintenance scenarios. However, due to the weight of the clothing, the astronaut's posture is largely restricted, resulting in a significant difference between the simulated state and the microgravity state in orbit. Therefore, most training needs to be conducted in a neutral buoyancy tank to ensure a more realistic simulation of the space microgravity environment. Given the constraints on the shape of the EVA power tool, an underwater power tool capable of operating at a depth of 10 meters is required.

[0003] In the existing technology, a Chinese patent entitled "An Underwater Electric Grinding Tool" uses a sealed housing filled with pressure-compensating oil, three sets of sealing rings to achieve a static seal on the outer shell, and a rotating step seal to achieve a dynamic seal on the motor output shaft. Since its outer shell is a regular cylindrical shape, its sealing method is relatively convenient and simple to implement. However, underwater electric tools used by astronauts have limited outer shells, as well as size and internal space constraints, making this type of sealed housing unsuitable. Furthermore, electric tools require periodic charging, making a quick-release interface on the battery sealing surface necessary. Therefore, the existing technology does not consider the quick-release requirement of the electric tool's charging module, nor does it address the sealing issue of the charging module.

[0004] Therefore, a handheld power tool is needed for use in astronaut neutral buoyancy tanks that is easy to disassemble for charging modules and remains reliably sealed after multiple charges. Summary of the Invention

[0005] The purpose of this application is to provide a handheld power tool for use in an astronaut neutral buoyancy tank, which can solve at least one of the aforementioned technical problems. The specific solution is as follows:

[0006] A handheld power tool for use in an astronaut neutral buoyancy tank includes: a segmented sealed housing, with a sealed charging module connected between the handle of the segmented sealed housing and the battery box;

[0007] The upper end of the battery box has a groove that matches the shape of the sealed charging module, and the groove is used to accommodate the sealed charging module.

[0008] The sealed charging module is circumferentially secured to the battery box by multiple fasteners.

[0009] The bottom of the grip is circumferentially secured to the sealed charging module by multiple fasteners:

[0010] The connection points between the sealed charging module and the grip and battery box are respectively provided with a fifth static sealing ring and a sixth static sealing ring.

[0011] The sealed charging module is provided with a plug mounting interface, and the battery's electrical connector plug is mounted to the plug mounting interface by fasteners.

[0012] The bottom of the grip has a socket mounting interface, and the electrical connector socket is installed to the socket mounting interface by fasteners. The electrical connector socket is used in conjunction with the electrical connector plug.

[0013] Furthermore, it also includes a replaceable wrench head assembly and an electric drive module;

[0014] The segmented sealed housing includes an end cap, a middle ring, a main shell, a top cap, the handle, the sealed charging module, and the battery box.

[0015] The motor output shaft of the drive motor of the electric drive module is connected to the segmented sealed housing by a mechanical seal, and the motor output shaft is connected to the replaceable wrench head assembly.

[0016] The end cap, middle ring and main shell are detachably connected in sequence and together house the electric drive module;

[0017] The end cap is used to pass through the motor output shaft. The inner cavity of the end cap provides space for the rotation of the motor output shaft and the rotating ring of the mechanical seal. The rotating ring of the mechanical seal is installed on the motor output shaft. A first static sealing ring is provided between the circumferential contact surface of the end cap and the middle ring.

[0018] The inner cavity of the middle ring provides installation space for the drive motor. The portion of the housing near the end cover of the middle ring is used to fix the stationary ring of the mechanical seal. A second stationary sealing ring is provided between the circumferential contact surface of the middle ring and the main housing.

[0019] The top cover is circumferentially connected to the top of the main shell by a third static sealing ring.

[0020] The grip is sealed to the bottom of the main housing;

[0021] The battery box is used to connect the battery and the power switch. The battery box includes a main body and a battery box side cover. A fourth static sealing ring is provided between the battery box side cover and the main body.

[0022] Furthermore, the end cap and the middle ring are fixedly connected by screws;

[0023] The end cap is provided with a screw operating through hole in the circumferential direction, and the middle ring is provided with a stepped through hole. The sealing screw for fastening the middle ring and the main shell passes through the screw operating through hole and the stepped through hole and is fastened to the main shell. The nut of the sealing screw is bonded with a sealing gasket.

[0024] Furthermore, the segmented sealed housing also includes a crash barrier, which is located on the top surface of the top cover away from the rear end of the central ring.

[0025] Furthermore, the anti-collision block is U-shaped and can be covered with a top cover. The segmented sealing housing also includes a U-shaped metal mounting shell. The metal mounting shell is attached to the outer surface of the front end of the anti-collision block. The metal mounting shell is fastened to the anti-collision block by multiple screws. The metal mounting shell and the anti-collision block are fastened to both sides of the main housing by multiple screws.

[0026] Furthermore, the top cover has mounting holes for providing multiple indicator lights, and each mounting hole has a sealing ring groove. The circular sealing ring is placed in the sealing ring groove to achieve a sealed connection between the indicator light and the top cover.

[0027] Furthermore, a quick-change device is provided at the rear end of the replaceable wrench head assembly near the motor output shaft. The quick-change device cooperates with the motor output shaft, allowing astronauts to change the wrench head underwater according to the work object.

[0028] Furthermore, it also includes an isolated directional switch, wherein a directional switch mounting groove is provided on the side of the main housing opposite to the replaceable wrench head assembly; the directional switch mounting groove is used to install the directional switch.

[0029] Furthermore, the grip also includes a trigger switch, and the battery compartment is equipped with a power switch;

[0030] The grip is provided with an isolated trigger mounting interface for mounting a trigger switch, which is a magnetic induction push-button switch and is an isolated switch;

[0031] The battery box is provided with an isolation groove, and the power switch is a magnetic induction push-button switch and is an isolated switch.

[0032] Compared with the prior art, the above-described solutions of this application have at least the following beneficial effects:

[0033] This application provides a handheld power tool for use in astronaut neutral buoyancy tanks. Charging is achieved by disassembling the fasteners connecting the handle and the sealed charging module, disconnecting the battery power connector. As the number of charging cycles increases, the reliability of the threaded connection between the sealed charging module and the handle decreases. At this point, the fasteners connecting the sealed charging module and the battery box can be removed, and the sealed charging module can be replaced. This ensures the sealing reliability throughout the power tool's lifespan, maintaining a reliable underwater seal even after multiple charging cycles. Attached Figure Description

[0034] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0035] Figure 1 is a schematic diagram of the external structure of the handheld power tool provided in an embodiment of the present invention;

[0036] Figure 2 is a schematic diagram of the exploded structure of the handheld power tool provided in an embodiment of the present invention;

[0037] Figure 3 is a schematic diagram of the battery box provided in an embodiment of the present invention;

[0038] Figure 4 is a structural schematic diagram of the sealed charging module provided in an embodiment of the present invention;

[0039] Figure 5 is a schematic diagram of the trigger switch provided in an embodiment of the present invention;

[0040] Figure 6 is a schematic diagram of the rotary switch provided in an embodiment of the present invention;

[0041] Figure 7 is a schematic diagram of the anti-collision block provided in an embodiment of the present invention;

[0042] Figure 8 is a schematic diagram of the structure of the electrical connector socket and the electrical connector plug provided in an embodiment of the present invention.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Segmented sealed housing; 2. Trigger switch; 3. Direction switch; 4. Power switch; 5. Anti-collision block; 6. Replaceable wrench head assembly; 7. Electrical connector plug; 8. Electrical connector socket; 9. End cover; 101. First static sealing ring; 102. Middle ring; 103. Main shell; 104. Second static sealing ring; 105. Top cover; 106. Third static sealing ring; 1061. Grip; 107. Battery box; 108. Battery box side cover; 109. Fourth static sealing ring; 110. Sealed charging module; 111. Fifth static sealing ring; 112. Sixth static sealing ring; 113. Switch cap; 201. Magnetic sensitive element; 202. Knob cap; 301. Top bead; 302. Magnetic sensitive element; 303. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the article or device that includes said element.

[0047] The optional embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0048] As shown in Figures 1-8, according to a specific embodiment of the present invention, a handheld power tool used in an astronaut neutral buoyancy tank includes: a segmented sealed housing 1, and a sealed charging module 111 connected between the handle 107 and the battery box 108 of the segmented sealed housing 1.

[0049] The upper end of the battery box 108 has a groove that matches the shape of the sealed charging module 111, and the groove is used to accommodate the sealed charging module 111.

[0050] The sealed charging module 111 is circumferentially fastened to the battery box 108 by multiple fasteners; the bottom of the grip 107 is circumferentially fastened to the sealed charging module 111 by multiple fasteners.

[0051] A fifth static sealing ring 112 and a sixth static sealing ring 113 are respectively provided at the connection points between the sealed charging module 111 and the grip 107 and the battery box 108, so as to achieve a sealed connection between the sealed charging module 111 and the grip 107 and the battery box 108 respectively. The fifth static sealing ring 112 is installed in the sealing groove of the sealed charging module 111 and is sandwiched between the sealed charging module 111 and the grip 107. The sixth static sealing ring 113 is installed on the groove of the battery box 108 and is sandwiched between the bottom of the groove of the sealed charging module 111 and the groove of the battery box 108.

[0052] The sealed charging module 111 is provided with a plug mounting interface for an electrical connector plug. The battery's electrical connector plug is installed to the plug mounting interface by fasteners. The plug mounting interface is a cross-shaped opening, and its size meets the requirement that the electrical connector can pass through the sealed charging module from top to bottom, thus meeting the electrical connector installation requirements. The bottom of the grip 107 has a socket mounting interface. The electrical connector socket is installed to the socket mounting interface by fasteners. The electrical connector socket is used in conjunction with the electrical connector plug.

[0053] The segmented sealed housing 1 is the outer shell of the entire handheld power tool. The handle 107 and battery box 108 are part of the housing. The handle 107 facilitates handholding and power cable routing. The handle 107, sealed charging module 111, and battery box 108 are detachably fixed together from top to bottom by fasteners such as screws. As shown in Figure 4, the sealed charging module 111 has a generally hexagonal cross-section. A power supply connector is located in the middle of the sealed charging module 111, and the fifth static sealing ring 112 and the sixth static sealing ring 113 are located around the power supply connector. Preferably, the bottom surface of the handle 107 abuts against the top surface of the battery box 108.

[0054] This invention also provides a preferred embodiment, which further includes a replaceable wrench head assembly 6 and an electric drive module.

[0055] The segmented sealed housing 1 includes an end cap 101, a middle ring 103, a main housing 104, a top cover 106, a handle 107, a sealed charging module 111, and a battery box 108.

[0056] The motor output shaft of the drive motor of the electric drive module is connected to the segmented sealed housing 1 via a mechanical seal. The motor output shaft is connected to the replaceable wrench head assembly 6. The end cover 101, the middle ring 103, and the main housing 104 are sequentially and detachably connected and together house the electric drive module. The end cover 101 is used to pass through the motor output shaft, and its inner cavity provides space for the rotation of the motor output shaft and the rotating ring of the mechanical seal. The rotating ring of the mechanical seal is mounted on the motor output shaft, and a first static sealing ring 102 is provided between the circumferential contact surfaces of the end cover 101 and the middle ring 103. The inner cavity of the middle ring 103 provides installation space for the drive motor. The part of the housing of the middle ring 103 near the end cover 101 is used to fix the stationary ring of the mechanical seal. A second stationary sealing ring 105 is provided between the circumferential contact surface of the middle ring 103 and the main housing 104. The circumferential of the top cover 106 is sealed to the top of the main housing 104 by a third stationary sealing ring 1061. The handle 107 is sealed to the bottom of the main housing 104. The battery box 108 is used to connect the battery and the power switch 4. The battery box 108 includes a main body and a battery box side cover 109. A fourth stationary sealing ring 110 is provided between the battery box side cover 109 and the main body.

[0057] Specifically, the segmented sealed housing 1 effectively ensures the reliability of the overall machine's seal. The electric drive module includes a drive motor, an electronic control system that controls the drive motor, and indicator lights that reflect the power tool's operating status.

[0058] The end cover 101 is provided with multiple grooves for mounting the motor output shaft and the rotating ring of the mechanical seal. The end cover 101 is fastened to the middle ring 103 by circumferentially distributed screws. A first static sealing ring is installed between the circumferential contact surfaces of the end cover and the middle ring to achieve a sealed connection between the end cover and the middle ring. The end cover is provided with circumferentially arranged screw operating through holes for fastening between the middle ring and the main housing.

[0059] The middle ring 103 is used to fix the stationary ring of the mechanical seal and to provide the mounting interface for the front end of the drive motor. It is provided with circumferentially distributed threaded holes and stepped through holes. The threaded holes are used to connect with the end cover, and the stepped through holes are used to pass through the sealing screws to fasten the middle ring 103 and the main housing 104. A sealing gasket is bonded to the circumference of the sealing screws. After the sealing screws are tightened by threading, the water seal at the stepped through holes is ensured.

[0060] The main housing 104 provides a fixed interface for the rear end of the drive motor and an installation interface for the other electric drive modules. The front end of the main housing is connected to the middle ring, and a second static sealing ring is installed between the circumferential contact surfaces of the two to achieve a sealed connection between the main housing and the middle ring. The main housing is provided with a groove for the direction switch mounting seat.

[0061] The top cover is connected to the upper end of the main housing and provides mounting interfaces for at least 6 indicator lights. Each mounting hole has a sealing ring groove, and a circular sealing ring is placed in the sealing ring groove to achieve a seal between the mounting hole and the indicator light. The rear end of the top cover is provided with a bumper block mounting interface.

[0062] The grip connects to the lower end of the main shell and provides an interface for astronauts to grip and for power cable routing. The front of the grip has an isolated trigger mounting interface for the trigger switch, and the bottom has a battery-powered connector socket mounting interface. A square annular sealing ring is mounted on the top surface of the grip, which is sandwiched between the grip and the main shell to achieve a sealed connection between the two.

[0063] The battery compartment houses the battery and power switch. A sealed charging module is located at the top, and an isolated power switch mounting recess is located at the rear. The sealed charging module has a power connector plug and is mounted to the top of the battery compartment using fasteners. The sealed charging module connects to the bottom of the handle. The battery compartment side cover has structural reinforcing ribs and a fourth static sealing ring between it and the main body. Fifth and sixth static sealing rings are located at the connections between the sealed charging module and the handle and battery compartment, respectively. During charging, removing the fasteners at the connection between the handle and the sealed charging module disconnects the power connector socket at the handle from the battery power connector plug at the sealed charging module, allowing charging to proceed through the connector plug. As the number of charging cycles increases, the reliability of the threaded connection between the sealed charging module and the handle decreases. In this case, the fasteners connecting the sealed charging module and the battery compartment can be removed and replaced, ensuring the sealing reliability throughout the lifespan of the power tool.

[0064] Alternatively, the segmented sealed housing is typically made of corrosion-resistant aluminum alloy with anodized surface treatment, or non-metallic materials may be used.

[0065] The handheld power tool in this embodiment meets the ergonomic requirements of astronauts wearing extravehicular activity (EVA) suits. Based on the shape of the EVA tools used on the space station, this handheld power tool has a reliable underwater seal and can provide power output at a depth of 10 meters for extended periods. It is designed for long-term use by astronauts in neutral buoyancy tanks while wearing EVA suits. Due to the shape limitations of the underwater power tool, a segmented sealing structure is adopted to avoid irregular sealing surfaces, resulting in a good underwater sealing effect. This allows astronauts to start the power tool for work training at any time while in the tank. It also features a quickly detachable and replaceable sealed charging module, ensuring a reliable water seal even after multiple charges.

[0066] This invention also provides a preferred embodiment, relating to the specific connection method of the end cap, the middle ring, and the main shell: the end cap 101 and the middle ring 103 are fixedly connected by screws; the end cap 101 is provided with a screw operating through hole in the circumferential direction, and the middle ring 103 is provided with a stepped through hole. The sealing screw for fastening the middle ring 103 and the main shell 104 passes through the screw operating through hole and the stepped through hole and is fastened to the main shell 104. The nut of the sealing screw is bonded with a sealing gasket.

[0067] This invention also provides a preferred embodiment, in which the segmented sealed housing 1 further includes a collision protection block 5, which is located on the top surface of the top cover 106 at one end away from the middle ring 103 and at the rear end, to prevent power tools from hitting the astronaut's helmet visor.

[0068] More specifically, the anti-collision block 5 is U-shaped and can be covered by the top cover 106, with the two opposite sides of the U-shape located on both sides of the main housing. The segmented sealed housing 1 also includes a U-shaped metal mounting shell 501, which is attached to the outer surface of the front end of the anti-collision block 5 to expose the rear end of the anti-collision block. The metal mounting shell 501 is fastened to the anti-collision block 5 by multiple screws, and the metal mounting shell 501 and the anti-collision block 5 are fastened to both sides of the main housing 104 by multiple screws.

[0069] In embodiments of the present invention, the anti-collision block is made of a soft protective material (including but not limited to rubber) to prevent impact to the astronaut's helmet visor. It is mounted to the top cover and main shell via a metal mounting shell as an intermediate connector. The metal mounting shell is provided with a set of fastener mounting interfaces to reliably fix the soft material. Screws are inserted at both ends of the metal mounting shell 501 and the anti-collision block 5, and the screws are fastened to both sides of the main shell 104.

[0070] This invention also provides a preferred embodiment, wherein the top cover 106 has mounting holes for providing multiple indicator lights, each mounting hole having a sealing ring groove, and the circular sealing ring is placed in the sealing ring groove to achieve a sealed connection between the indicator light and the top cover 106.

[0071] Optionally, there are at least 6 indicator lights.

[0072] This invention also provides a preferred embodiment where a quick-change device is provided at the rear end of the replaceable wrench head assembly 6, and the quick-change device is mounted on the motor output shaft. This allows astronauts to change the wrench head underwater according to the task at hand.

[0073] This invention also provides a preferred embodiment, which further includes an isolated directional switch 3. A directional switch mounting groove is provided on the side of the main housing 104 away from the replaceable wrench head assembly 6. The directional switch mounting groove is used to install the directional switch.

[0074] The present invention also provides a preferred embodiment, which further includes a trigger switch 2 and a power switch 4.

[0075] Trigger switch 2 is a magnetic induction push-button switch with a pressing stroke of not less than 10mm, meeting the performance requirements of astronauts wearing extravehicular activity (EVA) suits. Trigger switch 2 is an isolated switch; the switch cap 201 is mounted to the isolated trigger mounting interface of the grip via two symmetrically distributed guide posts and a spring. The switch cap contains a magnet at its center. When pressed to the bottom, it engages with the magnetic sensitive element 202 (including but not limited to Hall effect sensors) or induction coil inside the grip to complete the circuit connection. After release, the spring returns, disconnecting the magnet inside the switch cap from the magnetic sensitive element. To extend the magnetic induction distance, an aluminum alloy plate of not less than 4mm is used to isolate the magnet and magnetic sensitive element inside the grip.

[0076] Both the direction switch 3 and the power switch 4 are magnetic induction rotary switches with at least two positions (on, off or forward, reverse, 0). The diameter of the knob cap 301 is greater than 30mm. The knob switch mounting surface has a certain tilt angle to meet the operation and visibility requirements of astronauts wearing extravehicular activity suits. The direction switch 3 is an isolated switch, installed in the groove of the direction switch mounting seat on the main shell. The rotating cap 301 connects the rotating shaft and the turntable. The turntable is equipped with a top ball and a magnet. The top ball works with the recess at the bottom of the groove of the power switch mounting seat to ensure the switching torque between the positions. The magnet works with the two magnetic sensitive elements 303 (including but not limited to Hall plates) or induction coils inside the groove of the main shell mounting seat to complete the switching of the forward and reverse circuits respectively.

[0077] This application provides a handheld power tool for astronaut neutral buoyancy tank training. By employing a segmented sealed housing, and combining multiple components such as end caps, a central ring, and a main shell, along with multiple static sealing rings, the overall seal of the complex shape is transformed into a reliable seal on regular mating surfaces. Special sealing treatment is applied to critical areas such as screw holes and indicator light holes. The technical solution features an independently designed, quickly detachable sealed charging module. This module connects to the handle and battery compartment via screws, and an independent static sealing ring is provided at the interface, allowing for individual replacement of the easily damaged charging interface, achieving sealed maintainability throughout the tool's entire lifespan. Simultaneously, the tool uses a magnetic induction isolation switch, eliminating the need for dynamic sealing through physical penetration of the housing, and is compatible with a long-stroke trigger and large-size knob to meet the operational requirements of astronauts in extravehicular activity (EVA) suits. A soft anti-collision block reinforced with a metal shell is located on the top to protect the astronaut's face shield, and the output shaft connects to a quick-change wrench assembly to adapt to different missions. The technical solution of this application, while ensuring high-fidelity training simulation, achieves long-term reliable sealing, convenient maintenance and safe operation of the tool at a water depth of 10 meters. Under the constraints of the actual extravehicular tool shape, it systematically solves the technical problems of long-term reliable underwater sealing, convenient maintenance and ergonomic adaptation of spacesuits.

[0078] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems or apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and relevant parts can be referred to the method section.

[0079] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 application.

Claims

1. A handheld power tool used in an astronaut neutral buoyancy tank, characterized in that, include: A segmented sealed housing (1) is provided, with a sealed charging module (111) connected between the handle (107) and the battery box (108). The upper end of the battery box (108) has a groove matching the shape of the sealed charging module (111), which is used to accommodate the sealed charging module (111). The sealed charging module (111) is circumferentially fastened to the battery box (108) by multiple fasteners. The bottom of the handle (107) is circumferentially fastened to the sealed charging module (111) by multiple fasteners. The sealed charging module (111) is provided with a fifth static sealing ring (112) and a sixth static sealing ring (113) at the connection between it and the grip (107) and the battery box (108); the sealed charging module (111) is provided with a plug installation interface, and the battery's electrical connector plug (7) is installed to the plug installation interface by fasteners; the bottom of the grip (107) is provided with a socket installation interface, and the electrical connector socket (8) is installed to the socket installation interface by fasteners, and the electrical connector socket (8) is used in pairs with the electrical connector plug (7).

2. The handheld power tool used in an astronaut neutral buoyancy tank according to claim 1, characterized in that, It also includes a replaceable wrench head assembly (6) and an electric drive module; the segmented sealed housing (1) includes an end cover (101), a middle ring (103), a main housing (104), a top cover (106), the handle (107), the sealed charging module (111), and the battery box (108); the motor output shaft of the drive motor of the electric drive module is connected to the segmented sealed housing (1) via a mechanical seal, and the motor output shaft is connected to the replaceable wrench head assembly (6); the end cover (101), the middle ring (103), and the main housing (104) are sequentially detachably connected and together accommodate the electric drive module; the end cover (101) is used to pass through the motor output shaft, and the inner cavity of the end cover (101) provides space for the rotation of the motor output shaft and the rotating ring of the mechanical seal, the rotating ring of the mechanical seal is installed on the motor output shaft, and the end cover (101) and the middle ring are connected to the main housing (108). A first static sealing ring (102) is provided between the circumferential contact surfaces of the ring (103); the inner cavity of the middle ring (103) provides installation space for the drive motor; the part of the housing of the middle ring (103) near the end cover (101) is used to fix the static ring of the mechanical seal; a second static sealing ring (105) is provided between the circumferential contact surfaces of the middle ring (103) and the main housing (104); the circumferential of the top cover (106) is sealed to the top of the main housing (104) by a third static sealing ring (1061); the handle (107) is sealed to the bottom of the main housing (104); the battery box (108) is used to connect the battery and the power switch (4); the battery box (108) includes a main body and a battery box side cover (109); a fourth static sealing ring (110) is provided between the battery box side cover (109) and the main body.

3. A handheld power tool used in an astronaut neutral buoyancy tank according to claim 2, characterized in that, The end cap (101) and the middle ring (103) are fixedly connected by screws; the end cap (101) is provided with a screw operation through hole in the circumferential direction, and the middle ring (103) is provided with a stepped through hole. The sealing screw for fastening the middle ring (103) and the main shell (104) passes through the screw operation through hole and the stepped through hole and is fastened to the main shell (104). The nut of the sealing screw is bonded with a sealing gasket.

4. A handheld power tool used in an astronaut neutral buoyancy tank according to claim 2, characterized in that, The segmented sealed housing (1) also includes a crash block (5), which is located on the top surface of the top cover (106) away from the rear end of the middle ring (103).

5. A handheld power tool for use in an astronaut neutral buoyancy tank according to claim 4, characterized in that, The anti-collision block (5) is U-shaped and can be covered by a top cover (106). The segmented sealed housing (1) also includes a U-shaped metal mounting shell (501). The metal mounting shell (501) is attached to the outer surface of the front end of the anti-collision block (5). The metal mounting shell (501) is fastened to the anti-collision block (5) by multiple screws. The metal mounting shell (501) and the anti-collision block (5) are fastened to both sides of the main housing (104) by multiple screws.

6. A handheld power tool for use in an astronaut neutral buoyancy tank according to claim 2, characterized in that, The top cover (106) has mounting holes for providing multiple indicator lights. Each mounting hole has a sealing ring groove. The circular sealing ring is placed in the sealing ring groove to achieve a sealed connection between the indicator light and the top cover (106).

7. A handheld power tool for use in an astronaut neutral buoyancy tank according to claim 2, characterized in that, The replaceable wrench head assembly (6) is equipped with a quick-change device at the rear end near the motor output shaft. The quick-change device works in conjunction with the motor output shaft to allow astronauts to change the wrench head underwater according to the work object.

8. A handheld power tool for use in an astronaut neutral buoyancy tank according to claim 2, characterized in that, It also includes an isolated directional switch (3), and the main housing (104) has a directional switch mounting groove on the side facing away from the replaceable wrench head assembly (6); the directional switch mounting groove is used to install the directional switch (3).

9. A handheld power tool for use in an astronaut neutral buoyancy tank according to claim 2, characterized in that, The grip (107) also includes a trigger switch (2), and the battery box (108) is provided with a power switch (4); the grip (107) is provided with an isolated trigger mounting interface for mounting the trigger switch (2), the trigger switch (2) is a magnetic induction push-button switch and is an isolated switch; the battery box (108) is provided with an isolation groove, and the power switch (4) is a magnetic induction push-button switch.

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