Instrument cover opening tool

Abstract

The utility model belongs to the field of unscrambler, especially instrument cover unscrambler. In order to solve the technical problem of inconvenient and unattractive of the existing unscrambler, the utility model discloses an instrument cover unscrambler, including handle and the clamping belt of two ends free setting, the clamping belt can be accommodated in the cavity of handle. The utility model sets up the cavity on the unscrambler handle, and the tail end of clamping belt is not fixed on the handle, but both ends are free end, and the clamping belt is accommodated in the cavity to improve the portability and the aesthetic property of unscrambler when not using.

Description

Technical Field

[0001] This utility model relates to an instrument cover opening tool, belonging to the field of cover openers. Background Technology

[0002] In industrial applications, instruments used to measure pressure, temperature, liquid level, flow rate, etc., generally consist of a meter head and a meter body. The front and rear covers of the meter body are typically sealed with circular seals. The internal threads of the circular seal cover are sealed to the meter body. Opening or closing the cover requires loosening or tightening the cover. Some brands of instruments require disassembling the threaded bolts or hex bolts securing the cover to the meter body before opening the cover. Due to the small contact area of ​​the cover, there is significant resistance when opening and closing it, making it difficult for maintenance personnel to open and close the cover quickly and effortlessly. Auxiliary tools are often used to open and close the cover; however, using unsuitable auxiliary tools can easily damage the cover surface. Currently, there is a lack of a dedicated cover-opening tool that can both protect the instrument and improve the efficiency of opening and closing the cover.

[0003] To address the aforementioned issues, Chinese invention patent CN103523725A discloses a single-handle cap opener. The handle includes a clamping part, a clamping block, and a clamping strap. The clamping strap has teeth, one end of which is fixed to the handle, and the other end forms an adjustable clamping structure with the clamping block. The clamping strap, combined with the clamping part, can clamp caps of various diameters. The clamping part's function is to contact, support, and hold the cap. When the user grips the handle and rotates the cap, the clamping strap wraps around the cap, and the clamping part, supported by the cap, forms a fulcrum, allowing the handle to easily open some difficult-to-grip caps using a lever-driven mechanism. However, the clamping strap in this invention always protrudes from the handle, affecting the opener's portability and aesthetics. Utility Model Content

[0004] The purpose of this utility model is to provide an instrument cover opening tool to solve the technical problems of existing cover opening tools being inconvenient to carry and unsightly.

[0005] To achieve the above objectives, this utility model provides an instrument cover opening tool, including a handle and a clamping strap. The handle is equipped with a locking device. The first end of the clamping strap and the locking device form an adjustable clamping structure so that the first end of the clamping strap is a free end, and the second end of the clamping strap is also a free end. The handle has a cavity that can accommodate the clamping strap. The handle has an opening that communicates with the cavity. The clamping strap passes through the opening of the cavity. The end of the second end of the clamping strap is equipped with a limiting structure. The handle is equipped with a stop structure that matches the limiting structure so that when the clamping strap is pulled out of the cavity to the limit position, the limiting structure can be stopped and limited within the cavity, thereby preventing the clamping strap from being completely pulled out of the cavity.

[0006] Beneficial Effects: This utility model is an improved invention. Both ends of the clamping strap are designed as free ends, and a cavity is provided inside the handle. The clamping strap extends through the opening of the cavity, and a limiting structure is provided at the tail end of the clamping strap. When using this cap-opening tool, the clamping strap is dragged outward from the cavity until the limiting structure at the tail end of the clamping strap contacts the stop structure on the handle. After wrapping the clamping strap around the bottle cap once, the other end of the clamping strap is fixed to the locking device. At this point, one end of the clamping strap is limited and fixed by the stop structure on the handle. The other end of the gripping strap is limited and fixed by the locking device on the handle, and the gripping strap clamps the instrument cover tightly. Turning the handle can achieve a high torque and effortless opening of the cover. Furthermore, the clamping diameter can be adjusted by the cooperation of the gripping strap and the locking device, so that the cover opening tool of this utility model can be used to open instrument covers of different sizes. When not in use, the gripping strap can be completely stored in the cavity of the handle, avoiding the gripping strap always protruding outside the handle, which would cause the cover opening tool to occupy a large space, thus improving the portability and aesthetics of the cover opening tool.

[0007] Furthermore, on the other side of the handle opposite to the cavity that can accommodate the clamping strap, there is an arc-shaped through groove with an opening facing radially outward of the handle for the first end of the clamping strap to pass through. The line connecting the center of the top entrance of the arc-shaped through groove and the center of the opening of the cavity on the handle intersects the center line of the handle. The clamping strap enters through the top entrance of the arc-shaped through groove and exits through the bottom exit of the arc-shaped through groove. The clamping strap is locked in the arc-shaped through groove by the locking device.

[0008] Beneficial effects: The clamping band passes through the arc-shaped groove and is locked by the locking device. Since the opening of the arc-shaped groove faces the radially outward side of the handle, the clamping band in the arc-shaped groove is pressed against the radially inward side of the handle by the radially outer groove wall of the arc-shaped groove, which facilitates the locking device to lock the clamping band. The line connecting the center of the top entrance of the arc-shaped groove and the center of the opening of the cavity on the handle intersects the center line of the handle. In this way, when the clamping band clamps the switch cover, the part of the clamping band exposed outside the handle is in the same plane, which can ensure a better clamping effect.

[0009] Furthermore, the locking device includes a connecting shaft detachably rotatably connected to the radially inner sidewall of the arc-shaped through groove, a shift fork connected to the connecting shaft key via a bushing, and a shift block connected to the connecting shaft key via a bushing. The shift fork and the shift block are located inside and outside the arc-shaped through groove, respectively. When the clamping band passes through the arc-shaped through groove, it can drive the shift fork to rotate. Manually rotating the shift block can drive the connecting shaft to rotate, thereby driving the shift fork to rotate. The instrument cover opening tool also includes a shift fork reset device for resetting the shift fork to the position abutting the clamping band. After the shift fork is reset, it can lock the clamping band to prevent it from retracting.

[0010] Beneficial effects: When the clamping band enters the arc-shaped through groove, it can automatically push the fork open, making it convenient to use. The fork reset device can reset the fork, so that when the clamping band enters from the top entrance of the arc-shaped through groove and exits from the bottom exit of the arc-shaped through groove, the fork can be pushed open by the moving clamping band. The fork reset device can keep the fork in contact with the surface of the clamping band at all times. Once the clamping band stops moving, the fork resets to the position of abutting the clamping band, which can prevent the clamping band from retracting, thereby locking the clamping band. After opening the cover, the clamping band can be unlocked by manually rotating the lever, which will drive the fork to rotate away from the clamping band.

[0011] Furthermore, the shift fork reset device includes a magnetic block fixed to the handle. The magnetic block is located radially outside the arc-shaped through groove. After the shift fork is moved by the clamping band, the magnetic block pulls the shift fork to reset through the magnetic force between itself and the shift fork, so as to lock the clamping band when the clamping band is stopped.

[0012] Beneficial effects: The shift fork is reset by magnetic attraction, the structure is simple and the service life is long.

[0013] Furthermore, the blocking structure is an open baffle with a hole for the clamping band to pass through, located inside the cavity; the limiting structure is a limiting plate located at the inner end of the clamping band within the cavity.

[0014] Beneficial effect: The clamping strip end is stably limited by the cooperation of the limiting plate and the opening baffle.

[0015] Furthermore, a stop block is provided at the end of the clamping strap that cooperates with the locking device. The stop block can cooperate with the opening of the cavity on the handle to prevent the clamping strap from entering the cavity completely. At least one of the limiting plate and the stop block is detachably connected to the clamping strap.

[0016] Beneficial effects: When the clamping strap is stored in the cavity, the end of the strap protrudes outside the cavity, making it easy to pull the strap outwards; when different lengths of clamping straps are needed to open different instrument covers with large size differences, or when the clamping strap needs to be replaced after long-term use and severe wear, the stop block and / or limit plate can be removed, allowing the end of the clamping strap to pass through the hole in the opening baffle, so that the clamping strap can be pulled out from the handle cavity for replacement.

[0017] Furthermore, the clamping strap has serrations on the side that contacts the watch cover.

[0018] Beneficial effects: Increases the friction between the clamping strap and the watch cover, making it easier to unscrew and open the cover. At the same time, the serrations can also work with the shift fork to improve the locking effect of the locking device on the clamping strap.

[0019] Furthermore, the top of the handle is provided with an upward-facing arc-shaped clamping part.

[0020] Beneficial effects: The arc-shaped clamping part fits the instrument cover more closely, and when rotating to open the cover, the clamping part supports the instrument cover to form a fulcrum, making it easier to open the cover.

[0021] Furthermore, the handle has at least three cavities inside. The first cavity is located on the left side inside the handle to accommodate the clamping strap. The right side inside the handle has a second cavity for storing commonly used auxiliary tools for opening the cover, and a third cavity formed by an arc-shaped through groove and a cover plate of the third cavity. The commonly used auxiliary tools for opening the cover are screwdrivers or hexagonal screwdrivers.

[0022] Beneficial effects: For some brands of instruments, the cross bolts or hex bolts that fasten the cover to the body need to be removed before opening the cover. The handle contains an auxiliary tool for removing the bolts, which can be used for multiple purposes, making the cover opening tool more versatile.

[0023] Furthermore, the first chamber and the second chamber are respectively provided with a first chamber cover plate and a second chamber cover plate for opening and closing the corresponding chambers, and the first chamber cover plate and the second chamber cover plate are side covers or end covers.

[0024] Beneficial effects: The cover facilitates the opening and closing of the cavity, and makes it easy to replace the clamping strap or use the opening tool. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the instrument cover opening tool of this utility model in use;

[0026] Figure 2 This is a schematic diagram of the instrument cover opening tool of this utility model when it is not in use;

[0027] Figure 3 This is a three-dimensional structural diagram of the instrument cover opening tool of this utility model from another perspective.

[0028] The components are as follows: 1. First chamber; 2. Elastic anti-slip handle; 3. Limiting plate; 4. Opening baffle; 5. First chamber opening; 6. Rubber strip; 7. Arc-shaped through-slot inlet; 8. Magnet; 9. Slotted thread connecting shaft; 10. Shift fork; 11. Shift block; 12. Conical plug; 13. Arc-shaped through-slot outlet; 14. Third chamber; 15. Second chamber; 16. Cover opening auxiliary tool; 17. Slotted thread bolt; 18. Cover opening auxiliary tool ring; 19. Arc-shaped through-slot; 20. Third chamber cover; 21. Second chamber cover; 22. First chamber cover; 23. Rubber strip serration; 24. Handle. Detailed Implementation

[0029] To address the problems in the background technology, the core inventive concept of this utility model is as follows: a cavity is provided on the handle of the cap-opening tool, and the tail end of the clamping strap is not fixed to the handle, but both ends are free ends. When not in use, the clamping strap is stored in the cavity to improve the portability and aesthetics of the cap-opening tool.

[0030] The present invention will be further described in detail below with reference to embodiments of the instrument cover opening tool.

[0031] like Figure 1 , Figure 2 and Figure 3 As shown, the instrument cover opening tool of this utility model includes a handle 24 and a clamping strap. The top of the handle 24 is provided with an arc-shaped clamping part with the opening facing upward. The handle 24 has three chambers inside. The first chamber 1 is located on the left side inside the handle 24. The second chamber 15 and the third chamber 14 are arranged sequentially from bottom to top on the right side inside the handle 24. The outer side of the handle 24 is provided with a first chamber cover plate 22, a second chamber cover plate 20 and a third chamber cover plate 21 for opening and closing the corresponding chambers. The top side of the handle 24 is provided with a first chamber opening 5 that connects to the first chamber. The clamping strap passes through the first chamber opening 5. The tail end of the clamping strap located in the first chamber 1 is provided with a limiting plate 3. The top of the first chamber 1 is provided with an opening baffle 4 that cooperates with the limiting plate 3. After the clamping strap passes through the hole of the opening baffle 4, it passes through the first chamber opening 5. When the clamping strap is dragged outward to the limit position, the limiting plate 3 at the tail end of the clamping strap cooperates with the opening baffle 4 in the first chamber to stop and limit the tail end of the clamping strap in the first chamber 1, thereby preventing the clamping strap from being completely pulled out of the first chamber 1. When not in use, the clamping strap can be stored in the first chamber 1. In this embodiment, the clamping strap is a rubber strap 6, and the side of the rubber strap 6 that contacts the watch cover is provided with serrations.

[0032] The third chamber 14 is provided with an arc-shaped through groove 19 with its opening facing radially outward from the handle 24. The top inlet and bottom outlet of the arc-shaped through groove 19 are located on the side of the handle 24. The rubber band 6 enters through the top of the arc-shaped through groove 19 and exits through the arc-shaped through groove outlet 13 at the bottom of the arc-shaped through groove 19. The line connecting the center of the arc-shaped through groove inlet 7 and the center of the opening 5 of the first chamber intersects the centerline of the handle 24. In this way, when the rubber band 6 clamps the switch cover, the part of the rubber band 6 exposed outside the handle 24 is located in the same plane, which can ensure a better clamping effect. The third chamber cover plate 20 and the arc-shaped through groove 19 form an open third chamber. The third chamber cover 20 is designed so that when it is closed onto the arc-shaped through groove 19, the arc-shaped through groove inlet 7 is not completely closed, so that the rubber band 6 can pass through the gap formed by the third chamber cover 20 and the arc-shaped through groove inlet 7, thus avoiding interference. The third chamber cover 20 is provided with a hole for the rubber band 6 to pass through at the position corresponding to the arc-shaped through groove outlet 13. The rubber band 6 is locked in the arc-shaped through groove 19 by the locking device. The end of the rubber band 6 that extends out of the first chamber 1 forms an adjustable clamping structure with the locking device to achieve adjustable clamping diameter, thereby enabling the opening tool of this utility model to be used to open instrument covers of different sizes.

[0033] The locking device includes a slotted threaded connecting shaft 9 rotatably connected to the radially inner sidewall of the arc-shaped through groove 19, a shift fork 10 connected to the slotted threaded connecting shaft 9 via a bushing and a key, and a shift block 11 connected to the slotted threaded connecting shaft 9 via a bushing and a key. The shift fork 10 and the shift block 11 are located inside and outside the arc-shaped through groove 19, respectively. The third chamber cover plate 20 has a hole for the slotted threaded connecting shaft 9 to pass through. After the third chamber cover plate 20 is closed, the slotted threaded connecting shaft 9 is inserted into the bushing fixed to the shift fork 10 after passing through the corresponding hole on the third chamber cover plate 20, so as to realize the detachable keyed rotational engagement between the slotted threaded connecting shaft 9 and the bushing of the shift fork 10. Then, the bushing fixed to the shift block 11 is connected to the slotted threaded connecting shaft 9. The connecting shaft 9 is detachably rotated with a flat key to achieve linkage between the shift block 11 and the shift fork 10. The shift block 11 is connected to the slotted thread connecting shaft 9 at the position on the outer surface of the handle to facilitate manual operation of the shift block 11. When the rubber band 6 passes through the arc-shaped through groove 19, it can drive the shift fork 10 to rotate clockwise. The instrument cover opening tool also includes a shift fork reset device for resetting the shift fork 10 to the position abutting the rubber band 6. After the shift fork is reset, it can lock the rubber band 6. The shift fork reset device includes a magnet 8 fixed to the handle 24. The magnet 8 is located on the radial outside of the arc-shaped through groove 19. After the shift fork 10 is moved by the rubber band 6, the magnet 8 pulls the shift fork to reset through the magnetic force between it and the shift fork 10, so as to lock the rubber band 6 when the pulling of the rubber band 6 stops. After opening the cover, when it is necessary to unlock the rubber band 6, the lever 11 can be manually rotated to drive the lever fork 10 to rotate clockwise, so that the lever fork 10 moves away from the rubber band 6, thereby unlocking the locking device from the rubber band 6. Then the rubber band 6 can be pulled out from the arc-shaped through groove 19 and stored in the first chamber 1. When the locking device is not used, the slotted thread connecting shaft 9 and the lever 11 can be removed and stored in the first chamber 1.

[0034] A tapered plug 12 is provided at the end of the rubber band 6 that cooperates with the locking device. The tapered plug 12 can cooperate with the edge of the opening 5 of the first chamber to prevent the rubber band 6 from entering the first chamber 1 completely. This ensures that when the rubber band 6 is stored in the first chamber 1, the tapered plug 12 at the end protrudes outside the first chamber 1, making it easy to drag the rubber band 6 outward during use. In this embodiment, at least one of the limiting plate 3 and the tapered plug 12 is detachably connected to the rubber band 6. The detachable connection can be achieved by a quick-connect coupling or by a threaded connection, etc.

[0035] The second chamber 15 is used to store the opening tool 16, such as a screwdriver and an external hexagonal screwdriver. The bottom of the second chamber 15 is an open structure. A slotted bolt 17 is fixed inside the second chamber 15. The bottom of the opening tool 16 is provided with an opening tool ring 18. The ring at the bottom of the tool is fitted onto the slotted bolt 17. When the opening tool 16 is needed, the second chamber cover 21 of the second chamber 15 is opened, the opening tool 16 is rotated around the slotted bolt 17 to the outside of the handle 24, and then the second chamber cover 21 is closed. The opening tool 16 is inserted into the cross groove or hexagonal groove of the bolt to be removed, and the bolt can be removed by screwing. The handle 24 is provided with an elastic anti-slip handle 2 on the side, away from the positions of the three chamber covers.

[0036] In normal storage, the rubber band 6 of this instrument cover opening tool is completely located inside the first chamber 1, with only the conical plug 12 at the tail end of the rubber band 6 protruding from the first chamber 1 opening 5 for the rubber band 6 to pass through. In use, the conical plug 12 protruding from the first chamber 1 is pulled out. First, the rubber band 6 is wrapped around the workpiece, and then it is passed through the arc-shaped through groove 19 in the third chamber 14. When the rubber band 6 enters the arc-shaped through groove 19, it automatically pushes the shift fork 10 open. The magnet 8 magnetically attracts the shift fork 10 back to its original position, maintaining contact between the shift fork 10 and the surface of the rubber band 6. Once the rubber band 6 is tightly wrapped around the instrument cover and no longer moves relative to the arc-shaped through groove 19, the shift fork 10 returns to its original position abutting the rubber band 6. After placement, the rubber band 6 can be prevented from retracting, thus locking the rubber band 6 and maintaining the clamping force of the rubber band 6 on the instrument cover. Then, hold the handle 24 by hand and twist it forcefully to open the instrument cover. After opening the cover, rotate the dial 11 clockwise to drive the dial fork 10 to rotate clockwise, thereby releasing the locking of the dial fork 10 on the rubber band 6. Then, pull out the rubber band 6 from the arc-shaped through groove 19. After pulling out the rubber band 6, insert the rubber band 6 directly into the first chamber 1 through the opening 5 of the first chamber, or open the first chamber cover 22 of the first chamber 1 and manually drag the tail end of the rubber band 6 in the first chamber 1 to pull the rubber band 6 into the first chamber 1, thereby completely storing the rubber band 6 in the first chamber 1.

[0037] In the above embodiments, the third chamber cover 20 and the arc-shaped through groove 19 form an open third chamber 14, so that when the third chamber cover 20 is closed onto the arc-shaped through groove 19, the arc-shaped through groove inlet 7 is not completely closed, so that the rubber belt 6 can pass through the gap formed by the third chamber cover 20 and the arc-shaped through groove inlet 7, thus avoiding interference. In other embodiments, when the third chamber cover 20 is closed onto the arc-shaped through groove 19, the arc-shaped through groove inlet 7 is completely closed, but a hole is provided on the third chamber cover 20 at the position corresponding to the arc-shaped through groove inlet 7 for the rubber belt 6 to pass through.

[0038] In the above embodiments, the bushing fixed to the dial block 11 is detachably rotated with the slotted thread connecting shaft 9 via a flat key. In other embodiments, the dial block 11 can also be fixedly connected to the slotted thread connecting shaft 9.

[0039] In the above embodiment, the handle 24 is provided with an elastic anti-slip handle 2 on the side away from the three chamber cover plates. In other embodiments, anti-slip handles may also be provided on the outside of the three chamber cover plates.

[0040] In the above embodiment, the end of the rubber band 6 that cooperates with the locking device is provided with a conical plug 12 as a stop block. The conical plug 12 can cooperate with the edge of the opening 5 of the first chamber to prevent the rubber band 6 from entering the first chamber 1 completely. In other embodiments, the stop block can also be a stop structure of other shapes, such as a spherical plug, a cube or a plate structure.

[0041] In other embodiments, the clamping strap may not be a rubber strap 6; for example, the clamping strap may also be a chain.

[0042] In other embodiments, the shift fork 10 and the shift block 11 can also be splined to the slotted threaded shaft 9 via a bushing.

[0043] In other embodiments, the limiting structure may also be a cube or a conical plug, etc.

[0044] In other embodiments, the blocking structure may also be dot-shaped protrusions provided on the wall of the first chamber.

[0045] In other embodiments, the locking device can also be a locking system composed of a worm gear structure. Specifically, the locking device includes a worm wheel and a worm gear mounted on the handle via a rotatable connection. The worm gear meshes with the worm wheel, and a hook bent towards the opening of the arc-shaped through groove 19 is connected to the end face of the worm wheel. By rotating the worm gear, the worm wheel is controlled to rotate, which in turn drives the hook to rotate, thereby achieving locking and unlocking of the rubber belt 6. In other embodiments, the locking device can also be a ratchet locking device.

[0046] In other embodiments, the shift fork reset device may also be a tension spring or a compression spring, with one end of the tension spring or compression spring connected to the shift fork 10 and the other end connected to the side wall of the arc-shaped through groove 19 to apply a reset force to the shift fork 10.

[0047] In other embodiments, the connecting shaft may not be a slotted thread connecting shaft 9, but may be a slotted smooth rod connecting shaft.

[0048] In other embodiments, when the locking device is not used, the slotted thread connecting shaft 9 and the lever 11 can be removed and stored in the second chamber 15.

[0049] In other embodiments, the handle 24 may also have more cavities, such as a fourth chamber for storing rubber bands of different sizes, a fifth chamber for storing spare shift forks 10, shift blocks 11 and slotted thread connecting shafts 9, and a sixth chamber for storing disassembled slotted thread connecting shafts 9 and shift blocks 11.

[0050] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some technical features, or organically combine different types of specific implementation methods to create the specific implementation methods shown in the accompanying drawings. Of course, those skilled in the art can also create other specific implementation methods not shown in the accompanying drawings. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An instrument cover opening tool, comprising a handle and a clamping strap, wherein a locking device is provided on the handle, and a first end of the clamping strap and the locking device form an adjustable clamping structure such that the first end of the clamping strap is a free end, characterized in that: The second end of the clamping strap is also a free end. The handle has a cavity inside that can accommodate the clamping strap. The handle has an opening that connects to the cavity. The clamping strap passes through the opening of the cavity. The end of the second end of the clamping strap has a limiting structure. The handle has a stop structure that matches the limiting structure so that when the clamping strap is pulled out of the cavity to the limit position, the limiting structure can be stopped and limited in the cavity, thereby preventing the clamping strap from being completely pulled out of the cavity.

2. The instrument cover opening tool according to claim 1, characterized in that: On the other side of the handle opposite to the cavity that can accommodate the clamping strap, there is an arc-shaped through groove with an opening facing radially outward of the handle for the first end of the clamping strap to pass through. The line connecting the center of the top entrance of the arc-shaped through groove and the center of the opening of the cavity on the handle intersects the center line of the handle. The clamping strap enters through the top entrance of the arc-shaped through groove and exits through the bottom exit of the arc-shaped through groove. The clamping strap is locked in the arc-shaped through groove by the locking device.

3. The instrument cover opening tool according to claim 2, characterized in that: The locking device includes a connecting shaft detachably rotatably connected to the radial inner sidewall of the arc-shaped through groove, a shift fork connected to the connecting shaft key via a bushing, and a shift block connected to the connecting shaft key via a bushing. The shift fork and the shift block are located inside and outside the arc-shaped through groove, respectively. When the clamping band passes through the arc-shaped through groove, it can drive the shift fork to rotate. Manually rotating the shift block can drive the connecting shaft to rotate, thereby driving the shift fork to rotate. The instrument cover opening tool also includes a shift fork reset device for resetting the shift fork to the position abutting the clamping band. After the shift fork is reset, the clamping band can be locked to prevent it from retracting.

4. The instrument cover opening tool according to claim 3, characterized in that: The shift fork reset device includes a magnetic block fixed to the handle. The magnetic block is located radially outside the arc-shaped through groove. After the shift fork is moved by the clamping band, the magnetic block pulls the shift fork to reset through the magnetic force between itself and the shift fork, so as to lock the clamping band when the clamping band is stopped.

5. The instrument cover opening tool according to any one of claims 1 to 4, characterized in that: The blocking structure is an open baffle with a hole for the clamping band to pass through, located inside the cavity; the limiting structure is a limiting plate located at the end of the clamping band inside the cavity.

6. The instrument cover opening tool according to claim 5, characterized in that: The end of the clamping strap that cooperates with the locking device is provided with a stop block. The stop block can cooperate with the opening of the cavity on the handle to prevent the clamping strap from entering the cavity completely. At least one of the limiting plate and the stop block is detachably connected to the clamping strap.

7. The instrument cover opening tool according to any one of claims 1 to 4, characterized in that: The clamping strap has serrations on the side that contacts the watch cover.

8. The instrument cover opening tool according to any one of claims 1 to 4, characterized in that: The top of the handle has an upward-facing arc-shaped clamping part.

9. The instrument cover opening tool according to any one of claims 1 to 4, characterized in that: The handle has at least three cavities inside. The first cavity is located on the left side inside the handle to accommodate the clamping strap. The right side inside the handle has a second cavity for storing commonly used auxiliary tools for opening the cover, and a third cavity formed by an arc-shaped through groove and a cover plate of the third cavity. The commonly used auxiliary tools for opening the cover are screwdrivers or hexagonal screwdrivers.

10. The instrument cover opening tool according to claim 9, characterized in that: The first chamber and the second chamber are respectively provided with a first chamber cover plate and a second chamber cover plate for opening and closing the corresponding chamber. The first chamber cover plate and the second chamber cover plate are side covers or end covers.

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