Multifunctional screwdriver with screwdriver body capable of being replaced inside

Abstract

The invention belongs to the technical field of maintenance tools, and particularly relates to a multifunctional screwdriver with cutter bodies capable of being replaced inside, the multifunctional screwdriver comprises a shell, eight storage grooves are formed in the inner wall of the shell in a circumferential array mode, the cutter bodies with different cutting edges are installed in the eight storage grooves correspondingly, and first clamping grooves and second clamping grooves are formed in the surfaces of the cutter bodies correspondingly; and a torque transmission surface and a stop surface are arranged on each cutter body. The eight storage grooves are formed in the shell, the eight different types of cutter bodies are arranged in the eight storage grooves correspondingly, the first clamping grooves, the second clamping grooves, the torque transmission faces and the stop faces are arranged on the cutter bodies, and the fixing frame, the shifting piece, the front end cover, the rear end cover, the release assembly, the hole channel, the clamping assembly and other structures are arranged; according to the technical scheme, eight types of different cutter bodies can be replaced according to the use requirement condition of a user, so that the use requirement of the user can be better met, and after the cutter bodies are replaced, the cutter bodies can be better fixed.

Description

Technical Field

[0001] The invention relates to the technical field of repair tools, in particular to a multifunctional screwdriver with a tool body capable of being replaced internally. Background Art

[0002] The screwdriver is a very important installation and maintenance tool, and has almost become a must-have tool for family life and industrial production. The screwdriver is divided into two types: integral type and replaceable blade type. The integral screwdriver blade and the blade body are firmly connected, and a larger tightening force can be used during work. The disadvantage is that the blade has only one shape and size. In order to meet the needs of work, it is necessary to equip several screwdrivers with different blade forms, which not only increases the space for storing tools, but also wastes a lot of materials for manufacturing the blade body. Some replaceable blade screwdrivers on the market currently solve the disadvantage that the integral type cannot replace the blade, but because the connection between the blade and the blade body is a clearance fit and axial fixation cannot be achieved, the blade may fall out along the axial direction during work, causing the loss of the blade, and sometimes causing serious injury accidents. Therefore, it is strictly forbidden to use replaceable blade screwdrivers in some important industrial production. Therefore, we propose a multifunctional screwdriver with an internally replaceable blade body to solve the above problems. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies of the prior art, the present invention provides a multifunctional screwdriver with a replaceable blade body inside, which solves the problems raised in the above-mentioned background technology.

[0005] (II) Technical solution

[0006] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0007] A multifunctional screwdriver with a replaceable blade body internally comprises a shell, the inner wall of the shell being provided with eight storage slots in a circular array, blade bodies with different blades being respectively installed in the eight storage slots, surfaces of the blade bodies being provided with a first clamping slot and a second clamping slot, the blade bodies being provided with a torque transmission surface and a stop surface, a fixing frame being fixedly installed in the shell, eight paddles being rotatably installed in a circular array on the fixing frame through a pin shaft and a torsion spring, the top ends of the eight paddles being respectively engaged in the eight second clamping slots, the bottom end of the shell being threadedly connected to a front end cover, the top end of the shell being threadedly connected to a rear end cover, a releasing component for releasing the blade body being provided in the shell, a channel matching the blade torque transmission surface being provided in the middle portion of the front end cover, and a clamping component for engaging the first clamping slot on the blade body being provided on the front end cover.

[0008] Further, the release assembly includes a cylinder arranged inside the shell, the bottom end of the cylinder is sleeved with a first bearing, the outer ring of the first bearing is embedded and fixedly installed inside the front end cover, the surface of the cylinder is provided with a blanking groove adapted to the knife body, the top of the cylinder is fixed with a square block, the surface of the square block is fixed with a knob, the surface of the knob is sleeved with a ratchet, the surface of the knob is sleeved with a second bearing, the bottom of the ratchet is fixedly connected to the top of the inner ring of the second bearing, the outer side of the ratchet is sleeved with a fixing frame, the top of the fixing frame is fixed with a chuck, the chuck is clamped and installed in eight storage slots, the bottom of the fixing frame is fixedly connected to the top of the outer ring of the second bearing, the top of the fixing frame is fixedly connected to the bottom of the outer ring of the second bearing, the inner wall of the fixing frame is rotatably installed with a pawl adapted to the ratchet through a pin shaft and a torsion spring, the surface of the knob is fixed with an arc key for squeezing the paddle, and the top of the knob passes through the rear end cover.

[0009] Furthermore, the ratchet has sixteen teeth, a marking line is provided on the surface of the knob corresponding to the position of the arc key, and eight marking lines are provided on the surface of the rear end cover in a circular array, and the eight marking lines correspond to the positions of eight paddles.

[0010] Furthermore, the locking assembly includes four blocks slidably installed in a circular array inside the front end cover, the four blocks are adapted to the first slot, the interior of the front end cover is provided with four installation grooves for assembling the blocks in a circumferential array, spring members are fixed in the four installation grooves, one end of the spring members is fixedly connected to the surface of the corresponding block, a third bearing is installed at the bottom end of the front end cover, a hollow round block is installed inside the inner ring of the third bearing, a cross-shaped arc protrusion adapted to the four blocks is fixed on the top of the hollow round block, a hollow shell head is fixed to the bottom of the hollow round block, a locking nut is threadedly connected to the surface of the front end cover, and a thread adapted to the locking nut is provided on the top surface of the shell head.

[0011] Furthermore, the block is short at the bottom and long at the top, the lower end surface of the block is convex arc-shaped and matches with the cross-shaped arc convex block, and the upper end of the block is concave arc-shaped and matches with the first slot.

[0012] Furthermore, the cross-sections of the torque transmission surface and the stop surface on the blade body are both regular octagons, and the outer diameter of the stop surface is larger than the outer diameter of the torque transmission surface, the storage groove fits with the stop surface on the blade body, the cross-section of the channel is a regular octagon, and the inner diameter of the channel is the same as the outer diameter of the torque transmission surface on the blade body.

[0013] Furthermore, a guide slope is provided at the bottom end of each storage tank.

[0014] (III) Beneficial effects

[0015] Compared with the prior art, the present invention provides a multifunctional screwdriver with a replaceable blade body inside, which has the following beneficial effects:

[0016] The present invention provides eight storage slots in the shell, and respectively arranges eight different types of blades in the eight storage slots, and arranges a first card slot, a second card slot, a torque transmission surface and a stop surface on the blade, and arranges a fixing frame, a paddle, a front end cover, a rear end cover, a release component, a channel and a locking component and other structures. The eight different types of blades can be replaced according to the user's usage requirements, so as to better meet the user's usage requirements. After the blade is replaced, the blade can be better fixed. Compared with the existing integral screwdriver, the space for storing tools can be reduced and manufacturing materials can be saved. Compared with some screwdrivers with replaceable blades currently on the market, the blade can be better fixed, so the use safety is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the state after the whole of the present invention is disassembled;

[0019] Figure 3 This is a schematic diagram of the structure of the housing of the present invention from a first viewing angle;

[0020] Figure 4 This is a schematic diagram of the structure of the housing of the present invention from a second viewing angle;

[0021] Figure 5 It is a schematic diagram of the knife body structure of the present invention;

[0022] Figure 6 It is a schematic diagram of the structure of the release component of the present invention;

[0023] Figure 7 It is a schematic diagram of the cylindrical structure of the present invention;

[0024] Figure 8 is a schematic diagram of the second bearing structure of the present invention;

[0025] Fig. 9 It is a schematic diagram of the knob structure of the present invention;

[0026] Fig.10 It is a schematic diagram of the structure of the fixing frame of the present invention;

[0027] Fig.11 It is a schematic diagram of the ratchet and pawl structure of the present invention;

[0028] Fig.12 This is a schematic diagram of the front end cover structure of the present invention;

[0029] Fig.13 This is a schematic diagram of the first bearing structure of the present invention;

[0030] Fig.14 This is a schematic diagram of the cross-shaped arc convex block structure of the present invention;

[0031] Fig.15 This is a schematic diagram of the internal structure of the front end cover of the present invention;

[0032] Fig.16 This is a schematic diagram of the card block structure of the present invention;

[0033] Fig.17 It is a schematic diagram of the overall top view structure of the present invention;

[0034] Fig.18 For the present invention Fig.17 Schematic diagram of the cross-section structure at the middle edge AA;

[0035] Fig.19 It is a schematic diagram of the rear end cover structure of the present invention.

[0036] In the figure: 1, shell; 2, storage slot; 3, knife body; 4, first card slot; 5, second card slot; 6, fixing frame; 7, pick; 8, front cover; 9, rear cover; 10, release assembly; 1001, cylinder; 1002, first bearing; 1003, blanking slot; 1004, square block; 1005, knob; 1006, ratchet; 1007, second bearing; 1008, fixing frame; 1009, chuck; 1010, pawl; 1011, arc key; 11, channel; 12, engaging assembly; 1201, card block; 1202, mounting slot; 1203, spring member; 1204, third bearing; 1205, hollow round block; 1206, cross-shaped arc protrusion; 1207, shell head; 1208, locking nut; 13, torque transmission surface; 14, stop surface. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Example

[0039] like Figure 1-19As shown, a multifunctional screwdriver with a replaceable blade body inside proposed in one embodiment of the present invention comprises a shell 1, the inner wall of the shell 1 is provided with eight storage slots 2 in a circumferential array, blades 3 with different blades are respectively installed in the eight storage slots 2, the surface of the blade 3 is provided with a first card slot 4 and a second card slot 5, the blade 3 is provided with a torque transmission surface 13 and a stop surface 14, and the cross-sections of the torque transmission surface 13 and the stop surface 14 are both regular octagons, the storage slot 2 is matched with the stop surface 14 on the blade 3, so that the blade 3 can be installed in the storage slot 2 more stably, and a fixing frame 6 is fixedly installed in the shell 1, and the fixing frame 6 is arranged in a circumferential array through a pin shaft and a torsion spring for rotation and installation Eight paddles 7 are installed, and the top ends of the eight paddles 7 are respectively engaged in the eight second slots 5. The bottom end of the shell 1 is threadedly connected to the front end cover 8, and the top end of the shell 1 is threadedly connected to the rear end cover 9. A releasing component 10 for releasing the cutter body 3 is arranged in the shell 1. A channel 11 adapted to the torque transmission surface 13 of the cutter body 3 is opened in the middle of the front end cover 8. The cross section of the channel 11 is a regular octagon. The inner diameter of the channel 11 is the same as the outer diameter of the torque transmission surface 13 on the cutter body 3, and the outer diameter of the stop surface 14 is larger than the outer diameter of the torque transmission surface 13, which can prevent the cutter body 3 from completely sliding out of the channel 11. A locking component 12 for locking the first slot 4 on the cutter body 3 is arranged on the front end cover 8.

[0040] When it is necessary to release a certain blade body 3, the restriction on the current blade body 3 is released by using the release component 10, and then the current blade body 3 will fall into the front end cover 8, and the torque transmission surface 13 on the blade body 3 will fit with the channel 11 in the front end cover 8, thereby preventing the blade body 3 from rotating, and then the first card slot 4 on the blade body 3 is engaged by the locking component 12, so that the current blade body 3 can be locked to prevent the current blade body 3 from retracting. When it is necessary to replace other types of blade bodies 3, the currently used blade body 3 can be recovered first, and then another type of blade body 3 can be released and then locked, thereby better meeting the user's usage needs. Compared with the existing integral screwdriver, it can reduce the space for storing tools and save manufacturing materials. Compared with some screwdrivers with replaceable blades on the market, it can better fix the blade body 3 and is safer to use.

[0041] like Figure 2 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.11 and Fig.19As shown, in this embodiment, the release component 10 includes a cylinder 1001 arranged inside the housing 1, the bottom end of the cylinder 1001 is sleeved with a first bearing 1002, the outer ring of the first bearing 1002 is embedded and fixedly installed inside the front end cover 8, the surface of the cylinder 1001 is provided with a blanking groove 1003 adapted to the knife body 3, the top of the cylinder 1001 is fixed with a square block 1004, the surface of the square block 1004 is fixed with a knob 1005, the surface of the knob 1005 is sleeved with a ratchet 1006, the surface of the knob 1005 is sleeved with a second bearing 1007, the bottom of the ratchet 1006 is fixedly connected to the top of the inner ring of the second bearing 1007, the outer side of the ratchet 1006 is sleeved with a fixing frame 1008, and the top of the fixing frame 1008 is fixed. There is a chuck 1009, which is snap-fitted and installed in the eight storage slots 2. The bottom of the fixed frame 1008 is fixedly connected to the top of the outer ring of the second bearing 1007, and the top of the fixed frame 6 is fixedly connected to the bottom of the outer ring of the second bearing 1007. The inner wall of the fixed frame 1008 is rotatably installed with a pawl 1010 adapted to the ratchet 1006 through a pin shaft and a torsion spring. The surface of the knob 1005 is fixed with an arc key 1011 for squeezing the paddle 7. The top of the knob 1005 passes through the rear end cover 9. The ratchet 1006 has sixteen teeth. A marking line is set on the surface of the knob 1005 at a position corresponding to the position of the arc key 1011. The surface of the rear end cover 9 is provided with eight marking lines in a circular array, and the eight marking lines correspond to the positions of the eight paddles 7.

[0042] When it is necessary to release a certain knife body 3, the knob 1005 can be turned. Under the action of the ratchet 1006 and the pawl 1010, the knob 1005 can only be turned in a single direction clockwise. The knob 1005 will drive the arc key 1011 and the cylinder 1001 to rotate. When the arc key 1011 rotates to a paddle 7, it will force the paddle 7 to deflect. At this time, the mark line on the knob 1005 is aligned with a mark line on the rear end cover 9. The paddle 7 deflects, thereby releasing the restriction on the second slot 5 on the corresponding knife body 3. At this time, the blanking groove 1003 on the cylinder 1001 is facing this knife body 3, so at this time, the knife body 3 will fall into the blanking groove 1003 under the action of its own gravity. The bottom end of the storage groove 2 is provided with a guide slope to facilitate the knife body 3 to enter the blanking groove 1003, and then the knife body 3 falls into the front end cover 8 under the action of its own gravity.

[0043] like Figure 2 , Fig.12 , Fig.13 , Fig.14 , Fig.15 , Fig.16 and Fig.18As shown, in this embodiment, the clamping assembly 12 includes four clamping blocks 1201 slidably mounted in a circular array inside the front end cover 8, the four clamping blocks 1201 are adapted to the first clamping groove 4, the interior of the front end cover 8 is provided with four mounting grooves 1202 for assembling the clamping blocks 1201 in a circular array, and spring members 1203 are fixed in the four mounting grooves 1202, one end of the spring member 1203 is fixedly connected to the surface of the corresponding clamping block 1201, and a third bearing 1204 is installed at the bottom end of the front end cover 8, and a hollow round block is installed inside the inner ring of the third bearing 1204 1205, a cross-shaped arc protrusion 1206 adapted to the four clamping blocks 1201 is fixed on the top of the hollow round block 1205, a hollow shell head 1207 is fixed on the bottom of the hollow round block 1205, a locking nut 1208 is threadedly connected to the surface of the front end cover 8, and a thread adapted to the locking nut 1208 is provided on the top surface of the shell head 1207, the clamping block 1201 is short at the bottom and long at the top, the lower end surface of the clamping block 1201 is convex arc-shaped and adapted to the cross-shaped arc protrusion 1206, and the upper end of the clamping block 1201 is concave arc-shaped and adapted to the first clamping groove 4.

[0044] When it is necessary to lock and engage the knife body 3 that has slipped to the front end cover 8, the hollow shell head 1207 can be rotated, and the hollow shell head 1207 will drive the hollow round block 1205 to rotate, and the hollow round block 1205 will drive the cross-shaped arc protrusion 1206 to rotate. When the groove on the surface of the cross-shaped arc protrusion 1206 is at the block 1201, under the elastic force of the spring member 1203, the four blocks 1201 will be driven to retract inward, thereby causing the four blocks 1201 to engage with the first slot 4 on the knife body 3, so that the knife body 3 will not retract, and then the locking nut 1208 is rotated to rotate the locking nut 1208 downward, and the hollow shell head 1207 is connected to the front end cover 8 through the locking nut 1208, which can prevent the hollow shell head 1207 from rotating, thereby forming a fixed relationship, so that the knife body 3 can be stably fixed.

[0045] The working principle and use process of the present invention are as follows: during use, when a certain blade body 3 needs to be released for use, the knob 1005 can be rotated. Under the action of the ratchet 1006 and the pawl 1010, the knob 1005 can only be rotated in a single direction clockwise, and the knob 1005 will drive the arc key 1011 and the cylinder 1001 to rotate. When the arc key 1011 rotates to a paddle 7, the paddle 7 will be pressed to deflect. At this time, the mark line on the knob 1005 is aligned with a mark line on the rear end cover 9, and the paddle 7 deflects, thereby releasing the restriction on the second slot 5 on the corresponding blade body 3. At this time, the blanking groove 1003 on the cylinder 1001 is facing the blade body 3, so the blade body 3 will fall into the blanking groove 1003 at this time, and then fall into the front end cover 8 under the action of gravity, and the torque transmission surface 13 on the blade body 3 is just at the channel 11, so that The knife body 3 can be prevented from rotating, the blade of the knife body 3 will pass through the hollow shell head 1207, and then the hollow shell head 1207 will be rotated, the hollow shell head 1207 will drive the hollow round block 1205 to rotate, and the hollow round block 1205 will drive the cross-shaped arc protrusion 1206 to rotate. When the groove on the surface of the cross-shaped arc protrusion 1206 is at the block 1201, under the elastic force of the spring member 1203, the four blocks 1201 will be driven to shrink inward, so that the four blocks 1201 will be engaged with the first groove 4 on the knife body 3, so that the knife body 3 will not retract into the blanking groove 1003, and then the locking nut 1208 is rotated to make the locking nut 1208 rotate downward, and the hollow shell head 1207 is connected to the front end cover 8 through the locking nut 1208, so that the hollow shell head 1207 can be prevented from rotating, thereby forming a fixed relationship, so that the knife body 3 can be stably fixed.

[0046] When it is necessary to replace another type of cutter body 3, the cutter body 3 currently in use is first recovered. The recovery process is to rotate the locking nut 1208 to make the locking nut 1208 rotate upward, so that the lock of the hollow shell head 1207 can be released, and then the hollow shell head 1207 is rotated, and the hollow shell head 1207 drives the cross-shaped arc protrusion 1206 to rotate. The cross-shaped arc protrusion 1206 will press the four blocks 1201 to expand outward, so that the four blocks 1201 are disengaged from the first slot 4 on the current cutter body 3, and the restriction on the current cutter body 3 is released. Then the locking nut 1208 is rotated again to make the locking nut 1208 rotate downward, and the hollow shell head 1207 is connected to the front end cover 8 through the locking nut 1208, so that this state can be maintained, and then the screwdriver is inverted as a whole, and the current cutter body 3 will smoothly fall into it under the action of its own gravity. The screwdriver is then placed flat and rotated. The current blade 3 will fall into the current storage slot 2 under the action of its own gravity. Then, the knob 1005 is turned clockwise. The knob 1005 will drive the arc key 1011 and the cylinder 1001 to rotate. The arc key 1011 will release the pressure on the current paddle 7. Under the action of the torsion spring on the paddle 7, the top of the paddle 7 will deflect out and engage in the second slot 5 on the current blade 3, so that the current blade 3 can be locked. Then, the knob 1005 is continued to be turned. When the mark line on the knob 1005 coincides with another mark line on the rear end cover 9, the arc key 1011 will fit with the paddle 7 at the position of the mark line, so that the blade 3 at the position of the mark line can be released. As for how to fix the blade 3, it will not be repeated here.

[0047] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multifunctional screwdriver with a replaceable blade body inside, characterized in that: The invention comprises a shell (1), wherein the inner wall of the shell (1) is provided with eight storage grooves (2) in a circumferential array, wherein blades (3) with different blades are respectively installed in the eight storage grooves (2), wherein the surfaces of the blades (3) are provided with a first clamping groove (4) and a second clamping groove (5), wherein the blades (3) are provided with a torque transmission surface (13) and a stop surface (14), wherein a fixing frame (6) is fixedly installed in the shell (1), wherein eight paddles (7) are rotatably installed in a circumferential array on the fixing frame (6) through a pin shaft and a torsion spring, wherein the eight paddles (7) are rotatably installed on the fixing frame (6) in a circumferential array through a pin shaft and a torsion spring, wherein the eight The top ends of the paddles (7) are respectively engaged in eight second slots (5); the bottom end of the shell (1) is threadedly connected to a front end cover (8); the top end of the shell (1) is threadedly connected to a rear end cover (9); a release component (10) for releasing the blade (3) is arranged in the shell (1); a hole (11) adapted to a torque transmission surface (13) of the blade (3) is opened in the middle of the front end cover (8); and a locking component (12) for locking the first slot (4) on the blade (3) is arranged on the front end cover (8).

2. A multifunctional screwdriver with a replaceable blade body according to claim 1, characterized in that: The release assembly (10) comprises a cylinder (1001) arranged inside the housing (1), a first bearing (1002) being sleeved and installed on the bottom end of the cylinder (1001), an outer ring of the first bearing (1002) being embedded and fixedly installed inside the front end cover (8), a material drop groove (1003) adapted to the cutter body (3) being provided on the surface of the cylinder (1001), a square block (1004) being fixed on the top end of the cylinder (1001), a knob (1005) being fixed on the surface of the square block (1004), a ratchet (1006) being sleeved and fixed on the surface of the knob (1005), a second bearing (1007) being sleeved and installed on the surface of the knob (1005), the bottom of the ratchet (1006) being aligned with the second bearing (1007). The top of the inner ring is fixedly connected, the outer side of the ratchet (1006) is sleeved with a fixed frame (1008), the top of the fixed frame (1008) is fixed with a chuck (1009), and the chuck (1009) is snap-fitted and installed in the eight storage slots (2), the bottom of the fixed frame (1008) is fixedly connected to the top of the outer ring of the second bearing (1007), the top of the fixed frame (6) is fixedly connected to the bottom of the outer ring of the second bearing (1007), the inner wall of the fixed frame (1008) is rotatably installed with a pawl (1010) adapted to the ratchet (1006) through a pin shaft and a torsion spring, the surface of the knob (1005) is fixed with an arc key (1011) for squeezing the paddle (7), and the top of the knob (1005) passes through the rear end cover (9).

3. A multifunctional screwdriver with a replaceable blade body according to claim 2, characterized in that: The ratchet wheel (1006) has sixteen teeth, a marking line is provided on the surface of the knob (1005) at a position corresponding to the position of the arc key (1011), and eight marking lines are provided on the surface of the rear end cover (9) in a circular array, and the eight marking lines correspond to the positions of the eight paddles (7).

4. A multifunctional screwdriver with a replaceable blade body according to claim 1, characterized in that: The engaging assembly (12) comprises four clamping blocks (1201) which are slidably mounted in a circular array inside the front end cover (8), the four clamping blocks (1201) being matched with the first clamping groove (4), the interior of the front end cover (8) being provided with four mounting grooves (1202) for mounting the clamping blocks (1201) in a circular array, a spring member (1203) being fixed in each of the four mounting grooves (1202), one end of the spring member (1203) being fixedly connected to the surface of the corresponding clamping block (1201), and the bottom of the front end cover (8) being fixedly connected to the surface of the corresponding clamping block (1201). A third bearing (1204) is installed at the end, and a hollow round block (1205) is installed inside the inner ring of the third bearing (1204). A cross-shaped arc protrusion (1206) adapted to the four blocks (1201) is fixed on the top of the hollow round block (1205), and a hollow shell head (1207) is fixed on the bottom of the hollow round block (1205). A locking nut (1208) is threadedly connected to the surface of the front end cover (8), and a thread adapted to the locking nut (1208) is provided on the top surface of the shell head (1207).

5. A multifunctional screwdriver with a replaceable blade body according to claim 4, characterized in that: The card block (1201) is short at the bottom and long at the top; the lower end surface of the card block (1201) is convex arc-shaped and matches the cross-shaped arc convex block (1206); the upper end of the card block (1201) is concave arc-shaped and matches the first card slot (4).

6. The multifunctional screwdriver with a replaceable blade body according to claim 1, characterized in that: The cross-sections of the torque transmission surface (13) and the stop surface (14) on the blade body (3) are both regular octagons, and the outer diameter of the stop surface (14) is larger than the outer diameter of the torque transmission surface (13). The storage groove (2) is matched with the stop surface (14) on the blade body (3). The cross-section of the hole (11) is a regular octagon, and the inner diameter of the hole (11) is the same as the outer diameter of the torque transmission surface (13) on the blade body (3).

7. The multifunctional screwdriver with a replaceable blade body according to claim 1, characterized in that: The bottom ends of the storage tanks (2) are each provided with a guide slope.

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