A quick-change blade shovel

Abstract

The present application belongs to the technical field of spade knives, and particularly relates to a spade knife with quick blade replacement. The spade knife with quick blade replacement comprises a lower cover, a holding part, an upper cover, a blade and a propening part. The lower cover is provided with the holding part at the rear end and is provided with a positioning protrusion at the front end. A positioning groove is formed on the blade, and the blade is sleeved on the positioning protrusion through the positioning groove. The upper cover is clamped on the lower cover through a rotatable buckle structure and the front end of the upper cover can be pressed on the blade. The propening part is arranged between the rear ends of the lower cover and the upper cover, and the propening part has a first state of lifting the rear end of the upper cover and a second state of lowering the rear end of the upper cover. When the propening part is in the first state, the rear end of the upper cover is lifted and the front end thereof is pressed downward to tightly press the blade. When the propening part is in the second state, the rear end of the upper cover is lowered and the front end thereof is lifted to replace the blade. The present application has reliable structure, faster blade replacement operation and more accurate blade positioning.

Description

Technical Field

[0001] This invention belongs to the field of shovel technology, and particularly relates to a shovel with a quick-change blade. Background Technology

[0002] A scraper is a common hand tool widely used to remove residues such as paint, glue, and stains from floors, walls, or other surfaces. This type of scraper typically consists of a blade, an upper and lower cover to hold the blade, and a handle attached to the rear of the lower cover. The blade's cutting edge wears down during use and needs to be replaced periodically.

[0003] Currently, most scrapers on the market use one or more screws to fasten the upper and lower covers, relying on friction between the covers and the blade to hold it in place. When changing the blade, the user must use external tools such as a screwdriver to loosen the screws, remove the upper cover, replace the blade, and then realign and tighten the screws. This entire blade replacement process is cumbersome, time-consuming, and requires external tools, making it inconvenient. Furthermore, the screws and upper cover are easily lost after being completely detached, which is particularly inconvenient in the workplace. For example, the Chinese utility model patent with authorization announcement number CN218149979U, entitled "A Scraper," adopts the above-mentioned technical solution. Summary of the Invention

[0004] To address the technical problems existing in the prior art, this application provides a shovel that is structurally reliable, easier to operate, and has more precise blade positioning, facilitating quick blade replacement.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A quick-change blade scraper includes a lower cover, a grip, an upper cover, a blade, and a support member. The grip is located at the rear end of the lower cover, and a positioning protrusion is provided at the front end of the lower cover. A positioning groove matching the positioning protrusion is formed on the blade, and the blade is sleeved on the positioning protrusion through the positioning groove. The upper cover is fastened to the lower cover by a rotatable snap-fit ​​structure, and its front end can press against the blade. The support member is located between the rear ends of the lower cover and the upper cover, and the support member has a first state in which the rear end of the upper cover is raised and a second state in which the rear end of the upper cover is lowered. When the support member is in the first state, the rear end of the upper cover is raised and its front end presses down to press against the blade. When the support member is in the second state, the rear end of the upper cover is lowered and its front end is raised to replace the blade.

[0006] Furthermore, the buckle structure includes an inverted U-shaped fixing part fixedly connected to the inner cavity of the lower cover and an L-shaped snap-fit ​​part fixedly connected to the inner cavity of the upper cover. The snap-fit ​​part is rotatably snapped into the inner cavity of the fixing part so that the buckle structure forms a rotation fulcrum for the rear end of the upper cover to rise and fall.

[0007] Furthermore, a limiting protrusion is provided on the upper surface of the lower cover at the rear end of the positioning protrusion, and a limiting groove is provided on the lower end of the upper cover. When the upper cover is pressed onto the blade, the limiting protrusion is embedded in the limiting groove. When the blade is sleeved on the positioning protrusion and its cutting edge is subjected to force, the back of the blade abuts against the limiting protrusion.

[0008] Furthermore, a rotating groove is formed along the axial direction of the gripping part, and a snap-fit ​​groove is formed radially along the rear end of the rotating groove along the gripping part; the supporting member includes a rotating plate rotatably embedded in the rotating groove via a pin and a snap-fit ​​plate disposed at the rear end of the rotating plate and embedded in the snap-fit ​​groove; when the snap-fit ​​plate is snapped into the snap-fit ​​groove by elastic deformation and self-locking, the first state is formed, and the front end of the rotating plate lifts the rear end of the upper cover; when the snap-fit ​​plate is moved to disengage it from the snap-fit ​​groove, the second state is formed, and the rear end of the upper cover is pressed to lower its rear end.

[0009] Furthermore, the gripping part is a fixed sleeve fixedly connected to the rear end of the lower cover; the supporting member is a rotating rod rotatably inserted inside the fixed sleeve, with a clearance plane formed by a first notch at the front end of the rotating rod; when the rotating rod rotates to the point where the outer circumference of the fixed sleeve abuts against the upper cover, the first state is formed, and the rear end of the upper cover is lifted; when the rotating rod rotates to the point where the first notch faces the rear end of the upper cover, the second state is formed, and the rear end of the upper cover is pressed down to lower its rear end.

[0010] Furthermore, a limiting plate is fixedly connected to the inner cavity of the lower cover between the fixed sleeve and the snap-fit ​​structure, and the limiting plate limits the axial movement of the rotating rod when the rotating rod rotates.

[0011] Furthermore, a rectangular limiting plane formed by a second notch is provided on the circumference of the rotating rod opposite to the first notch; a positioning plane is provided in the inner cavity of the rear end of the upper cover; when the limiting plane abuts against the positioning plane, the first state is formed, and the rear end of the upper cover is lifted.

[0012] Furthermore, the gripping part is a fixed rod fixedly connected to the inner cavity of the rear end of the lower cover; the opening member is a limiting sleeve slidably sleeved on the fixed rod, the front end of the limiting sleeve is provided with a tapered guide sleeve, and an avoidance notch extending to the front end of the guide sleeve is opened at the front end of the limiting sleeve; when the fixed rod is pushed to insert the limiting sleeve into the inner cavity of the rear end of the upper cover under the guidance of the guide sleeve, the first state is formed, and the rear end of the upper cover is lifted; when the fixed rod is pushed to the rear end to disengage the limiting sleeve from the inner cavity of the rear end of the upper cover, the second state is formed, and the rear end of the upper cover is pressed to lower its rear end.

[0013] Furthermore, the grip portion is a grip handle fixedly connected to the rear end of the lower cover; an installation sleeve is fixedly connected to the inner cavity of the lower cover between the grip handle and the buckle structure; the expansion member is a spring embedded in the installation sleeve and extending above the installation sleeve; when the rear end of the upper cover is not pressed, the spring abuts against the rear end of the upper cover, constituting the first state, and the rear end of the upper cover is raised; when the rear end of the upper cover is pressed to compress the spring, the second state is constituted, and the rear end of the upper cover is lowered.

[0014] Furthermore, a fixing post is fixedly connected to the inner cavity of the rear end of the upper cover, and the fixing post passes through the inner cavity of the spring.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention offers extremely quick blade replacement. Compared to existing technologies, this invention employs a non-threaded opening mechanism, allowing for rapid switching between the first state (raised rear end of the top cover) and the second state (lowered rear end of the top cover) with a single action, without the use of external tools. Compared to the gradual operation of existing technologies that require multiple rotations of adjusting screws, this invention requires only a single, simple action to clamp and release the blade, whether by moving the locking plate, rotating the rotating rod, sliding the limiting sleeve, or pressing the spring. This significantly reduces blade replacement time and greatly improves operational efficiency.

[0016] 2. The blade is positioned accurately and reliably, and is not easily displaced during use.

[0017] This invention features a positioning groove on the blade and a matching positioning protrusion on the lower cover. The blade is positioned by fitting into the positioning protrusion through the positioning groove. The positioning protrusion, in conjunction with the limiting protrusion, not only limits the horizontal installation position of the blade but also directly withstands the shearing force transmitted from the blade during scraping operations, preventing the blade from shifting due to force. Compared to existing technologies that rely solely on the clamping friction between the upper and lower covers to fix the blade, this invention provides more precise and secure blade positioning, ensuring the stability of the scraping operation.

[0018] 3. The supporting components of this invention come in various forms to adapt to different application scenarios. This invention provides multiple implementation schemes for supporting components such as rotating plates, rotating rods, limiting sleeves, and springs. Each scheme covers a wide range of applications in terms of operation methods, structural complexity, manufacturing costs, and applicable scenarios, allowing for flexible selection based on actual needs and meeting the requirements of different usage scenarios, from high-intensity heavy-duty scraping to lightweight household use. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the blade structure according to an embodiment of the present invention.

[0021] Figure 3 This is a three-dimensional structural diagram of Embodiment 1 of the present invention.

[0022] Figure 4 This is a schematic diagram of the exploded structure of Embodiment 1 of the present invention.

[0023] Figure 5 This is a schematic diagram of a half-section structure of Embodiment 1 of the present invention.

[0024] Figure 6 This is a schematic diagram of the lower cover and grip portion of Embodiment 1 of the present invention.

[0025] Figure 7 This is a schematic diagram of the connection structure of the rotating plate and the snap-fit ​​plate in Embodiment 1 of the present invention.

[0026] Figure 8 This is a schematic diagram of the structure of the upper cover in Embodiment 1 of the present invention.

[0027] Figure 9 This is a three-dimensional structural diagram of Embodiment 2 of the present invention.

[0028] Figure 10 This is a schematic diagram of the exploded structure of Embodiment 2 of the present invention.

[0029] Figure 11 This is a schematic diagram of a half-section structure of Embodiment 2 of the present invention.

[0030] Figure 12 This is a schematic diagram of the lower cover and grip portion of Embodiment 2 of the present invention.

[0031] Figure 13 This is a schematic diagram of the structure of the upper cover in Embodiment 2 of the present invention.

[0032] Figure 14 This is a three-dimensional structural diagram of Embodiment 3 of the present invention.

[0033] Figure 15 This is a schematic diagram of the exploded structure of Embodiment 3 of the present invention.

[0034] Figure 16 This is a schematic diagram of a half-section structure of Embodiment 3 of the present invention.

[0035] Figure 17 This is a schematic diagram of the lower cover and grip portion of Embodiment 3 of the present invention.

[0036] Figure 18 This is a schematic diagram of the structure of the upper cover in Embodiment 3 of the present invention.

[0037] Figure 19 This is a schematic diagram of the connection structure of the limiting sleeve and the guide sleeve in Embodiment 3 of the present invention.

[0038] Figure 20 This is a three-dimensional structural diagram of Embodiment 4 of the present invention.

[0039] Figure 21 This is a schematic diagram of the exploded structure of Embodiment 4 of the present invention.

[0040] Figure 22 This is a schematic diagram of a half-section structure of Embodiment 4 of the present invention.

[0041] Figure 23 This is a schematic diagram of the lower cover and grip portion of Embodiment 4 of the present invention.

[0042] Figure 24 This is a schematic diagram of the structure of the upper cover in Embodiment 4 of the present invention.

[0043] In the picture: 11. Shovel blade one, 12. Shovel blade two, 13. Shovel blade three, 14. Shovel blade four. 2. Lower cover; 21. Lower cover body; 22. Fixing plate; 23. Positioning protrusion; 24. Chamfer; 25. Limiting protrusion; 26. Fixing part; 27. Hanging groove; 28. Limiting plate; 29. ​​Mounting sleeve. 3. Grip part; 31. Grip rod; 311. Rotating groove; 312. Snap-fit ​​groove; 32. Fixing sleeve; 33. Fixing rod; 34. Grip handle. 4. Top cover; 41. Top cover body; 411. Positioning plane; 412. Guide surface; 42. Pressure plate; 43. Clearance through hole; 44. Limiting groove; 45. Snap-fit ​​part; 46. Fixing post. 5. Blade; 51. Positioning groove; 6. Spreading component; 61. Rotating plate; 62. Snap-fit ​​plate; 63. Pin; 64. Rotating rod; 641. First notch; 642. Clearance plane; 643. Second notch; 644. Limiting plane; 65. Limiting sleeve; 651. Guide sleeve; 652. Clearance notch; 66. Spring. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0045] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0046] See appendix Figure 1 As shown, a quick-change blade shovel has four structural forms, which are distinguished by being labeled as shovel one 11, shovel two 12, shovel three 13 and shovel four 14, and are specifically described through the following embodiments one, two, three and four. Example 1

[0047] See Figure 3 , 4 As shown, the shovel 11 provided in this embodiment includes a lower cover 2, a gripping part 3, an upper cover 4, a blade 5, and a support 6.

[0048] See Figure 6 As shown, the lower cover 2 includes a lower cover body 21 and a fixing plate 22 integrally formed and fixedly connected to the front end of the lower cover body 21. The lower cover body 21 is concave in the middle and its two sides are bent upward to form the inner cavity of the lower cover 2. The inner cavity of the lower cover body 21 gradually narrows from its front end to its rear end. The fixing plate 22 is arranged along the width direction of the lower cover body 21 and has a flat structure. At least one positioning protrusion 23 is formed on the upper surface of the fixing plate 22 at the front end of the lower cover 2.

[0049] See Figure 2 As shown, the blade 5 can be a conventional flat shovel blade. The difference from the existing shovel blade is that a positioning groove 51 matching the positioning protrusion 23 is provided on the blade 5. The blade 5 is fitted onto the positioning protrusion 23 through the positioning groove 51. The positioning and limiting of the blade 5 on the fixed plate 22 are achieved by setting the positioning protrusion 23.

[0050] It should be noted that the positioning groove 51 on the blade 5 has various structural forms, such as Figure 2 The positioning protrusion 23 may have one elongated, waist-shaped through hole, two circular through holes, or two waist-shaped through holes. Of course, the structure and number of the positioning protrusion 23 must match the positioning groove 51.

[0051] Furthermore, to facilitate the installation of the blade 5 onto the positioning protrusion 23, a chamfer 24 is provided at the front end of the positioning protrusion 23. When installing the blade 5, simply align the positioning groove 51 with the positioning protrusion 23 and push it forward; the blade 5 will then pass over the chamfer 24 and fit onto the positioning protrusion 23. At this time, the positioning protrusion 23 not only defines the horizontal position of the blade 5 but also bears the shearing force transmitted by the blade 5 during scraping operations, preventing the blade 5 from shifting.

[0052] Furthermore, to further limit the movement of the blade 5 and prevent it from dislodging from the positioning protrusion 23 when the cutting edge is under stress, multiple limiting protrusions 25 are integrally formed and fixedly connected to the upper end face of the fixing plate 22 at the rear end of the positioning protrusion 23. In this embodiment, three limiting protrusions 25 are provided along the length of the fixing plate 22. When the blade 5 is sleeved on the positioning protrusion 23 and its cutting edge is under stress, the back of the blade 5 abuts against the limiting protrusion 25.

[0053] See Figure 8 The diagram shows the structure of the upper cover 4. The shape of the upper cover 4 matches that of the lower cover 2 to achieve the upper cover 4 fitting onto the lower cover 2. Specifically, the upper cover 4 includes an upper cover body 41 and a pressure plate 42 located at the front end of the upper cover body 41. Similar to the structure of the lower cover body 21, the upper cover body 41 is concave in the middle and its two sides are bent downward to form the inner cavity of the upper cover 4. The inner cavity of the upper cover body 41 gradually narrows from its front end to its rear end. The pressure plate 42 is arranged along the width direction of the upper cover body 41 and has a flat plate structure.

[0054] An avoidance through hole 43 is provided on the pressure plate 42 of the upper cover 4 to avoid the positioning protrusion 23. A limiting groove 44 is provided on the lower end face of the pressure plate 42 at the rear end of the avoidance through hole 43. The avoidance through hole 43 and the limiting groove 44 are respectively matched with the shape and number of the corresponding positioning protrusion 23 and limiting protrusion 25. That is, when the upper cover 4 is placed on the lower cover 2, the limiting protrusion 25 is embedded in the limiting groove 44, the positioning protrusion 23 is embedded in the avoidance through hole 43, and the pressure plate 42 presses the blade 5 onto the fixing plate 22.

[0055] In order to enable the upper cover 4 to rotate relative to the lower cover 2, that is, when the upper cover 4 is placed on the lower cover 2, the rear end of the upper cover 4 can be lowered and raised. The upper cover 4 is secured to the lower cover 2 by a rotatable buckle structure, and the pressure plate 42 at the front end of the upper cover 4 can be pressed onto the blade 5.

[0056] See Figure 6 , 8 As shown, in this embodiment, the snap-fit ​​structure includes an inverted U-shaped fixing part 26 fixedly connected to the inner cavity of the lower cover body 21 of the lower cover 2 and an L-shaped snap-fit ​​part 45 fixedly connected to the inner cavity of the upper cover body 41 of the upper cover 4.

[0057] The two sides of the fixing part 26 extend downward and are fixedly connected to the lower cover body 21, forming a hanging groove 27 between them.

[0058] The vertical section of the latching part 45 extends downward from the lower end of the upper cover body 41, and the horizontal section of the latching part 45 extends from the lower end of its vertical section to the rear end of the upper cover 4. During assembly, the horizontal section of the latching part 45 is inserted into the hook groove 27 of the fixing part 26, and the upper surface of the horizontal section of the latching part 45 hooks onto the lower surface of the crossbeam of the fixing part 26, so that the upper cover 4 and the lower cover 2 can be rotatably hooked together. This hooking structure forms a stable lever fulcrum, forming a rotation fulcrum for the lifting and lowering of the rear end of the upper cover 4.

[0059] See Figure 6 As shown, in this embodiment, the gripping part 3 is an integral cylindrical gripping rod 31, which is fixedly connected to the end face of the rear end of the lower cover body 21. The upper circumference of the gripping rod 31 is higher than the upper end face of the lower cover body 41. In this embodiment, a rotating groove 311 is provided along the axial direction of the upper circumference of the front end of the gripping rod 31. The rotating groove 311 is a long strip-shaped groove extending along the length direction of the gripping rod 31 and communicating with the inner cavity of the lower cover 2. A snap-fit ​​groove 312 is provided radially along the gripping rod 31 at the rear end of the rotating groove 311. The snap-fit ​​groove 312 is connected to the rotating groove 311, wherein the bottom of the snap-fit ​​groove 312 is higher than the bottom of the rotating groove 311.

[0060] The support member 6 is disposed between the rear ends of the lower cover 2 and the upper cover 4. The support member 6 has a first state that raises the rear end of the upper cover 4 and a second state that lowers the rear end of the upper cover 4. When the support member 6 is in the first state, the rear end of the upper cover 4 is raised and its front end presses down on the blade 5. When the support member 6 is in the second state, the rear end of the upper cover 4 is lowered and its front end is raised to replace the blade 5.

[0061] See Figure 4 , 7 As shown, in this embodiment, the support member 6 includes a rotating plate 61, a snap-fit ​​plate 62, and a pin 63.

[0062] See Figure 3 As shown, the rotating plate 61 is rotatably embedded in the rotating groove 311 via the pin 63. The pin 63 is radially fixed through the two opposite groove walls of the rotating groove 311 along the gripping rod 31, so that the rotating plate 61 can swing up and down around the pin 63 in the rotating groove 311. The front end of the rotating plate 61 extends to the lower part of the rear end cavity of the upper cover body 41.

[0063] See Figure 7As shown, the snap-fit ​​plate 62 is disposed on the upper rear end of the rotating plate 61, and is integrally formed and fixedly connected to the rotating plate 61, forming a T-shape with the rotating plate 61. The snap-fit ​​plate 62 and the snap-fit ​​groove 312 of the gripping rod 31 have a certain elastic deformation capability, and the shape of the snap-fit ​​plate 62 matches the snap-fit ​​groove 312 so that it can be embedded in the snap-fit ​​groove 312.

[0064] The working principle and process of this embodiment are as follows: When it is necessary to clamp the blade 5, hold the gripping rod 31 with one hand and pull the locking plate 62 downward with the other hand, causing the rotating plate 61 to rotate around the pin 63. During this process, the front end of the rotating plate 61 is lifted upward, raising the rear end of the upper cover body 41 upward. When the locking plate 62 rotates to be embedded in the locking groove 312 and achieves self-locking, the rotating plate 61 and the locking plate 62 are parallel to the axis of the gripping rod 31, and the opening member 6 is in the first state. Since the rear end of the upper cover body 41 is lifted, the upper cover 4 rotates around the buckle structure, and the downward movement of the pressure plate 42 presses the blade 5 against the fixing plate 22 of the lower cover 2. It should be noted that since both the locking groove 312 and the locking plate 62 are rectangular cross-section structures, when the locking plate 62 is embedded in the locking groove 312 due to elastic deformation, the rear end face of the locking plate 62 abuts against the rear end wall of the locking groove 312 to form self-locking, and the state at this time is as follows. Figure 5 As shown.

[0065] When the blade 5 needs to be replaced, use your fingers to pull the locking plate 62 upwards, causing it to overcome the elastic deformation force and disengage from the locking groove 312. At this time, the rotating plate 61 loses the constraint of the locking groove 312, and the rear end of the upper cover body 41 descends under its own weight or slight pressure, with the support 6 in the second state. The upper cover body 41 rotates in the opposite direction around the buckle structure, and the pressure plate 42 tilts upwards to release the blade 5. The user can remove the blade 5 from the positioning protrusion 23, place the new blade 5 on the positioning protrusion 23, and then complete the clamping of the blade 5 by repeating the above-described clamping process. It should be noted that, in order to facilitate the pulling of the locking plate 62, both ends of the locking plate 62 can extend to the outside of the gripping rod 31.

[0066] In this embodiment, the support member 6 adopts a structure in which a hinged rotating plate 61 and a locking plate 62 cooperate. The specific beneficial effect of this structure is that when the locking plate 62 engages with the locking groove 312 of the gripping rod 31, a mechanical self-locking mechanism is formed. This self-locking method ensures that the rear end of the upper cover 4 will not accidentally loosen due to external forces or vibrations in any direction during the scraping operation after the blade 5 is lifted and pressed, providing high operational stability and safety. This structure maintains clamping force through the self-locking of the locking plate 62, and its advantages are particularly prominent in situations requiring long-term, high-intensity continuous operation. Example 2

[0067] See Figure 9 ,10 As shown, the shovel 12 provided in this embodiment includes a lower cover 2, a gripping part 3, an upper cover 4, a blade 5, and a supporting member 6. In this embodiment, a rotating rod 64 with a clearance plane is used as the supporting member 6.

[0068] The main difference between this embodiment and embodiment 1 lies in the specific structure of the gripping part 3 and the supporting part 6. The parts that are the same as those in embodiment 1 (such as the lower cover 2, the upper cover 4, and the blade 5) will not be described again in this embodiment; only the differences will be described.

[0069] See Figure 12 As shown, in this embodiment, the gripping part 3 is a fixed sleeve 32 fixedly connected to the rear end of the lower cover 2. The fixed sleeve 32 has a cylindrical structure and its inner cavity extends through the front and rear directions to connect with the inner cavity of the lower cover 2. The outer circumference of the fixed sleeve 32 is integrally formed with the rear end of the lower cover body 21. In addition, for ease of operation, the lower circumferential surface of the fixed sleeve 32 is flush with the lower surface of the lower cover body 21 to facilitate gripping the fixed sleeve 32; the lower part of the inner circumference of the fixed sleeve 32 is flush with the inner cavity of the rear end of the lower cover body 21 to facilitate the rotation of the rotating rod 64 through the fixed sleeve 32 and the inner cavity of the lower cover 2.

[0070] In this embodiment, the supporting member 6 is a rotating rod 64 that is rotatably inserted into the fixed sleeve 32 and the lower cover 2. The rotating rod 64 has a cylindrical rod structure and its outer diameter is adapted to the inner diameter of the fixed sleeve 32, so that the rotating rod 64 can rotate around its own axis within the fixed sleeve 32. The front end of the rotating rod 64 extends through the fixed sleeve 32 and extends to the lower part of the rear end cavity of the upper cover body 41.

[0071] See Figure 10 , 11 As shown, a first notch 641 is formed at the front end of the rotating rod 64 by cutting off a portion of the material. The first notch 641 forms a clearance plane 642 on the circumference of the rotating rod 64, and the clearance plane 642 is parallel to the axis of the rotating rod 64. When the rotating rod 64 rotates to different angles, the circumferential surface or clearance plane 642 at its front end will face the top wall of the inner cavity at the rear end of the upper cover body 41.

[0072] See Figure 12 As shown, in order to prevent the rotating rod 64 from moving axially during rotation, a limiting plate 28 is fixedly connected to the inner cavity of the lower cover body 21 between the fixed sleeve 32 and the fixing part 26 of the buckle structure. The limiting plate 28 is set perpendicular to the axis of the rotating rod 64. When the rotating rod 64 rotates, the limiting plate 28 axially limits the front end face of the rotating rod 64 to keep the axial position of the rotating rod 64 stable.

[0073] See Figure 13As shown, in order to further improve the stability of the rotating rod 64 in lifting the top wall of the inner cavity at the rear end of the upper cover body 41, a second notch 643 is also provided on the circumference of the rotating rod 64 away from the first notch 641. The second notch 643 forms a rectangular limiting plane 644; the width of the limiting plane 644 is smaller than the width of the avoidance plane 642.

[0074] Correspondingly, a positioning plane 411 is provided on the top wall of the inner cavity at the rear end of the upper cover body 41. The limiting plane 411 and the positioning plane 411 cooperate and abut against each other to increase their contact area. Under the obstruction of the inner cavity side wall at the rear end of the upper cover body 41 at the positioning plane 41, the limiting plane 644 is prevented from disengaging from the positioning plane 411 due to the rotation of the rotating rod 64 caused by the force on the blade 5. This improves the stability of the upper cover 4 and the lower cover 2 when clamping the blade 5.

[0075] The working principle and process of this embodiment are as follows: When it is necessary to clamp the blade 5, hold the fixing sleeve 32 with one hand and rotate the rotating rod 64 with the other hand, so that the rotating rod 64 rotates around its axis until the limiting plane 644 at its front end abuts against the positioning plane 411. At this time, the rotating rod 64 lifts the rear end of the upper cover body 41 upward, and the supporting member 6 is in the first state. The upper cover body 41 rotates around the buckle structure, and the pressure plate 42 presses the blade 5 downward.

[0076] When it is necessary to replace the blade 5, hold the retaining sleeve 32 with one hand and rotate the rotating rod 64 with the other hand, so that the rotating rod 64 rotates around its axis until the clearance plane 642 at its front end faces the positioning plane 411. At this time, a gap is created between the clearance plane 642 of the rotating rod 64 and the positioning plane 411, the rear end of the upper cover body 41 loses support and descends when pressed, and the supporting member 6 is in the second state, which is as follows. Figure 11 As shown. At this time, the pressure plate 42 tilts up to release the blade 5. The user can remove the blade 5 from the positioning protrusion 23, put the new blade 5 on the positioning protrusion 23, and then complete the clamping of the blade 5 by repeating the above clamping process.

[0077] It should be noted that, since the upper cover body 41 is raised to the highest point and then lowered by rotating the outer circumference of the rotating rod 64 when the support 6 changes between the first and second states, the upper cover 2 is made of an elastic material that can undergo elastic deformation or the corresponding buckle structure can undergo elastic deformation.

[0078] In this embodiment, the supporting member 6 is a rotatable rotating rod 64 with a clearance plane 642 and a limiting plane 644. Its specific beneficial effect is that, through rotation, the distance difference between the limiting plane 644 and the clearance plane 642 of the rotating rod 64 and their respective centers allows for rapid switching of the rear end state of the upper cover 4. When the limiting plane 644 abuts against the positioning plane 411 of the upper cover 4, surface contact support is formed, resulting in low contact stress and stable state. This structure has a short operation path, requiring only one rotation to complete the switching, and all components are simple rotating bodies, resulting in a compact structure that achieves a balance between ease of operation and structural simplicity. Example 3

[0079] See Figure 14 , 15 As shown, the shovel 13 provided in this embodiment includes a lower cover 2, a gripping part 3, an upper cover 4, a blade 5, and a supporting member 6. In this embodiment, a sliding limiting sleeve is used as the supporting member 6.

[0080] The main difference between this embodiment and embodiment 1 lies in the specific structure of the gripping part 3 and the supporting part 6. The parts that are the same as those in embodiment 1 (such as the lower cover 2, the upper cover 4, and the blade 5) will not be described again in this embodiment; only the differences will be described.

[0081] See Figure 17 As shown, in this embodiment, the grip part 3 is a fixed rod 33 fixedly connected to the inner cavity of the rear end of the lower cover body 21. The fixed rod 33 has a cylindrical rod structure and its rear end extends to the outer side of the rear end of the lower cover body 21 for the user to grip.

[0082] See Figure 19 As shown, the support 6 is a limiting sleeve 65 that can be slidably sleeved on the fixed rod 33. The limiting sleeve 65 is in the shape of a round tube and its inner hole slides with the outer diameter of the fixed rod 33, so that the limiting sleeve 65 can slide back and forth along the fixed rod 33.

[0083] The front end of the limiting sleeve 65 is provided with a tapered guide sleeve 651. The outer diameter of the guide sleeve 651 gradually decreases from the rear end to the front end, forming a tapered guide surface.

[0084] A clearance notch 652 extending to the front end of the guide sleeve 651 is provided at the front end of the limiting sleeve 65. The clearance notch 652 makes the front end of the limiting sleeve 65 form an incomplete annular structure in the circumferential direction. The clearance notch 652 is used to avoid the rear end of the lower cover body 21 located below the fixing rod 33. That is, when the front end of the guide sleeve 651 and the limiting sleeve 65 enters the inner cavity of the rear end of the upper cover body 41, the rear end of the lower cover body 21 will not obstruct the limiting sleeve 65.

[0085] See Figure 18As shown, further, in order to facilitate the insertion sleeve 651 and the limiting sleeve 65 into the rear end cavity of the upper cover body 41, a guide surface 412 is provided at the opening of the rear end cavity of the upper cover body 41. The guide surface 412 is trumpet-shaped, that is, its inner diameter gradually increases from the front end to the rear end.

[0086] The working principle and process of this embodiment are as follows: When it is necessary to clamp the blade 5, hold the fixing rod 33 at the rear end of the limiting sleeve 65 with one hand, and push the limiting sleeve 65 forward with the other hand. Under the guidance of the guide sleeve 651 and the guide surface 412, the limiting sleeve 65 is gradually inserted into the inner cavity of the rear end of the upper cover body 41. As the limiting sleeve 65 is pushed forward, the rear end of the upper cover body 41 is gradually lifted. When the side wall of the limiting sleeve 65 at the avoidance notch 652 abuts against the rear end face of the lower cover body 21, the rear end of the upper cover body 41 is lifted to the highest position, the support 6 is in the first state, and the pressure plate 42 presses the blade 5 down.

[0087] When it is necessary to replace the blade 5, hold the fixing rod 33 at the rear end of the limiting sleeve 65 with one hand, and pull the limiting sleeve 65 backward with the other hand to disengage the limiting sleeve 65 from the inner cavity at the rear end of the upper cover body 41. The state at this time is as follows. Figure 16 As shown. The rear end of the upper cover body 41 loses support and descends after being pressed, with the support member 6 in the second state. The pressure plate 42 tilts up to release the blade 5. The user can remove the blade 5 from the positioning protrusion 23, place a new blade 5 on the positioning protrusion 23, and then complete the clamping of the blade 5 by repeating the above-described clamping process.

[0088] It should be noted that, in order to improve the clamping force of the pressure plate 42 and the fixing plate 22 on the blade 5, the upper cover 2 is made of an elastic material that can undergo elastic deformation, or the corresponding snap-fit ​​structure can undergo elastic deformation.

[0089] In this embodiment, the expanding member 6 is an axially sliding limiting sleeve 65, with a tapered guide sleeve 651 at its front end. The specific beneficial effect is that when the limiting sleeve 65 is inserted into the rear end cavity of the upper cover 4, its outer circumferential surface provides a large continuous support surface, forming surface contact with the rear end cavity of the upper cover 4. This large-area support method ensures that the supporting force on the rear end of the upper cover 4 is evenly distributed, with low local stress, and can reliably withstand the large reaction force from the blade. Example 4

[0090] See Figure 20 , 21 As shown, the shovel 14 provided in this embodiment includes a lower cover 2, a gripping part 3, an upper cover 4, a blade 5, and a supporting member 6. In this embodiment, a spring is used as the supporting member 6.

[0091] The main difference between this embodiment and embodiment 1 lies in the specific structure of the gripping part 3 and the supporting part 6. The parts that are the same as those in embodiment 1 (such as the lower cover 2, the upper cover 4, and the blade 5) will not be described again in this embodiment; only the differences will be described.

[0092] See Figure 23 As shown, in this embodiment, the grip part 3 is a grip handle 34 fixedly connected to the rear end of the lower cover body 21. The grip handle 34 can be a cylindrical rod-shaped structure integrally formed with the rear end of the lower cover body 21 for the user to grip.

[0093] An mounting sleeve 29 is fixedly connected to the inner cavity of the lower cover body 31 between the grip handle 34 and the fixing part 26 of the buckle structure. The mounting sleeve 29 is a cylindrical structure and its lower end is fixedly connected to the lower cover body 21. The upper opening of the mounting sleeve 29 faces the rear end inner cavity of the upper cover body 41.

[0094] In this embodiment, the support 6 is a spring 66 embedded in the mounting sleeve 29. The lower end of the spring 66 abuts against the bottom of the mounting sleeve 29, and its upper end extends above the mounting sleeve 29 and abuts against the top wall of the rear end cavity of the upper cover body 41. The spring 66 is always in a compressed state to apply upward pressure to the rear end of the upper cover body 41.

[0095] See Figure 24 As shown, to prevent the spring 66 from shifting or twisting during use, a fixing post 46 is fixedly connected to the top wall of the inner cavity at the rear end of the upper cover body 41. The fixing post 46 extends downward and passes through the inner cavity of the spring 66. The fixing post 46 serves to guide and position the spring 66. The inner diameter of the mounting sleeve 29 is slightly larger than the outer diameter of the spring 66, and the outer diameter of the fixing post 46 is slightly smaller than the inner diameter of the spring 66.

[0096] The working principle and process of this embodiment are as follows: When the blade 5 needs to be clamped, i.e. in its natural state (without pressing the rear end of the upper cover body 41), the spring force of the spring 66 pushes the rear end of the upper cover body 41 upward, and the support member 6 is in the first state. The upper cover 4 rotates around the buckle structure, and the pressure plate 42 presses the blade 5 downward onto the fixing plate 22, as shown in the following state. Figure 22 As shown.

[0097] When it is necessary to replace the blade 5, hold the grip handle 34 at the rear end of the limiting sleeve 65 with one hand, and press the rear end of the upper cover body 41 with your thumb. The rear end of the upper cover body 41 moves downward against the elastic force of the spring 66, further compressing the spring 66, and the opening member 6 is in the second state. The pressure plate 42 tilts upward to release the blade 5. The user can remove the blade 5 from the positioning protrusion 23 and put the new blade 5 on the positioning protrusion 23. Then release the hand pressing the upper cover body 41. Under the elastic force, the spring 66 automatically lifts the rear end of the upper cover body 41, returning it to the first state, completing the clamping of the blade 5.

[0098] In this embodiment, the support 6 is a pre-compressed spring 66. Utilizing the elastic potential energy of the spring 66, it achieves automatic reset and immediate clamping. In its natural state, the spring 66 automatically and continuously lifts the rear end of the upper cover 4, ensuring stable pre-tension of the blade 5. When replacing the blade 5, only one hand is needed to overcome the spring force and press the rear end of the upper cover 4; after releasing, it automatically returns to clamping, simplifying the operation and providing users with a convenient and efficient operating experience.

[0099] The four embodiments described above differ in the specific structure of the supporting component, respectively meeting the requirements for operability and reliability in different application scenarios. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A quick-change blade shovel, characterized in that, include: Lower cover, grip, upper cover, blade and support; The gripping part is located at the rear end of the lower cover, and a positioning protrusion is provided at the front end of the lower cover; A positioning groove matching the positioning protrusion is provided on the blade, and the blade is sleeved on the positioning protrusion through the positioning groove; The upper cover is fastened to the lower cover by a rotatable snap-fit ​​structure and its front end can be pressed against the blade; The support member is disposed between the rear ends of the lower cover and the upper cover, and the support member has a first state that raises the rear end of the upper cover and a second state that lowers the rear end of the upper cover. When the expansion member is in the first state, the rear end of the upper cover is raised and its front end presses down to press the blade; when the expansion member is in the second state, the rear end of the upper cover is lowered and its front end is raised to replace the blade.

2. The quick-change blade shovel according to claim 1, characterized in that, The buckle structure includes an inverted U-shaped fixing part fixedly connected to the inner cavity of the lower cover and an L-shaped snap-fit ​​part fixedly connected to the inner cavity of the upper cover. The snap-fit ​​part can be rotatably snapped into the inner cavity of the fixing part so that the buckle structure forms a rotation fulcrum for the rear end of the upper cover to rise and fall.

3. The quick-change blade shovel according to claim 1, characterized in that, A limiting protrusion is provided on the upper end face of the lower cover at the rear end of the positioning protrusion, and a limiting groove is provided on the lower end of the upper cover. When the upper cover is pressed onto the blade, the limiting protrusion is embedded in the limiting groove. When the blade is sleeved on the positioning protrusion and its cutting edge is subjected to force, the back of the blade abuts against the limiting protrusion.

4. The quick-change blade shovel according to claim 1, characterized in that, A rotating groove is provided on the gripping part along its axial direction, and a snap-fit ​​groove is provided at the rear end of the rotating groove along the radial direction of the gripping part; the supporting member includes a rotating plate that is rotatably embedded in the rotating groove by means of a pin and a snap-fit ​​plate provided at the rear end of the rotating plate and that can be embedded in the snap-fit ​​groove. When the snap-fit ​​plate is locked in the snap-fit ​​groove by elastic deformation, the first state is formed, and the front end of the rotating plate lifts the rear end of the upper cover; when the snap-fit ​​plate is moved to disengage it from the snap-fit ​​groove, the second state is formed, and the rear end of the upper cover is pressed to lower its rear end.

5. The quick-change blade shovel according to claim 1, characterized in that, The gripping part is a fixed sleeve that is fixedly connected to the rear end of the lower cover; the supporting member is a rotating rod that can be rotatably inserted into the fixed sleeve, and the front end of the rotating rod is formed by a first notch to form a clearance plane. When the rotating rod rotates to the point where the outer circumference of the fixed sleeve abuts against the upper cover, the first state is formed, and the rear end of the upper cover is raised; when the rotating rod rotates to the point where the first notch faces the rear end of the upper cover, the second state is formed, and the rear end of the upper cover is pressed down to lower its rear end.

6. The quick-change blade shovel according to claim 5, characterized in that, A limiting plate is fixedly connected to the inner cavity of the lower cover between the fixed sleeve and the buckle structure. The limiting plate limits the axial movement of the rotating rod when it rotates.

7. The quick-change blade shovel according to claim 5, characterized in that, A rectangular limiting plane formed by a second notch is provided on the circumference of the rotating rod opposite to the first notch; a positioning plane is provided in the inner cavity of the rear end of the upper cover; when the limiting plane abuts against the positioning plane, the first state is formed, and the rear end of the upper cover is lifted.

8. The quick-change blade shovel according to claim 1, characterized in that, The gripping part is a fixed rod that is fixedly connected to the inner cavity of the rear end of the lower cover; the opening member is a limiting sleeve that can be slidably sleeved on the fixed rod, and the front end of the limiting sleeve is provided with a tapered guide sleeve, and an avoidance notch extending to the front end of the guide sleeve is opened at the front end of the limiting sleeve. When the fixing rod is pushed, the limiting sleeve is inserted into the inner cavity of the rear end of the upper cover under the guidance of the inlet sleeve, forming the first state, and the rear end of the upper cover is raised; when the fixing rod is moved to the rear end, the limiting sleeve is disengaged from the inner cavity of the rear end of the upper cover, forming the second state, and the rear end of the upper cover is pressed to lower its rear end.

9. A quick-change blade shovel according to claim 1, characterized in that, The grip portion is a grip handle fixedly connected to the rear end of the lower cover; an installation sleeve is fixedly connected to the inner cavity of the lower cover between the grip handle and the buckle structure; the support member is a spring that extends to the top of the installation sleeve and is embedded in the installation sleeve. When the rear end of the top cover is not pressed, the spring abuts against the rear end of the top cover, forming the first state, and the rear end of the top cover is raised; when the rear end of the top cover is pressed to compress the spring, the second state is formed, and the rear end of the top cover is lowered.

10. A quick-change blade shovel according to claim 9, characterized in that, A fixing post is fixedly connected to the inner cavity of the rear end of the upper cover, and the fixing post passes through the inner cavity of the spring.

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