Implant force limiting type digital wrench 10: 1 bending machine head

Abstract

The invention relates to the technical field of dental medical instruments, in particular to a 10: 1 bent handpiece of an implant force-limiting digital wrench. Comprising a rear cover component, a machine core component, a bending machine head shell, a transmission shaft component and a reduction gearbox force limiting mechanism combined component. According to the force limiting type digital wrench bent handpiece for the dental implant provided by the invention, through a spring and steel ball combined structure, when a machine is provided with a certain output torque, the handpiece is also set to the same torque value, and once the hindered torque at the terminal of a needle rod is greater than the set torque, a steel ball disc can generate friction rotation, so that overshoot is prevented, and the service life of the handpiece is prolonged. And the accuracy of output torsion is improved.

Description

Technical Field

[0001] The invention relates to the technical field of dental medical instruments, and in particular to a 10:1 angle handpiece of an implant force-limiting digital wrench. Background Art

[0002] Digital implantation is used in dental preoperative design, implant placement and repair process. During the operation, a torque wrench is used to tighten and remove the covering screws or healing base. In order to meet different implantation needs, a variety of different head wrenches (torque needle rods) are needed, which requires a curved handpiece with a larger torque range to meet the implantation needs under different applications. In the current dental field, the output torque accuracy of the implant digital wrench curved handpiece is not high. During the tightening process of the base screw, overshoot is easily formed (for example, when the machine sets the output torque to 30N·cm, the actual needle rod terminal output torque peak value far exceeds 30N·cm, especially the faster the speed, the more obvious the overshoot phenomenon). The present invention discloses a dental implant force-limiting digital wrench curved handpiece. Through a spring and steel ball combination structure, when the machine sets a certain output torque, the handpiece is also set to the same torque value. Once the needle rod terminal resistance torque is greater than the set torque, the steel ball disk will rotate by friction, thereby preventing overshoot and improving the accuracy of the output torque.

[0003] In the current dental field, the output torque accuracy of the implant digital wrench angle handpiece is not high, and overshoot is very easy to occur during the tightening of the abutment screws (for example, when the machine is set to output a torque of 30N·cm, the actual peak value of the output torque of the needle rod terminal far exceeds 30N·cm, especially the faster the speed, the more obvious the overshoot phenomenon). Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a force-limited digital wrench contra-angle handpiece for a dental implant.

[0005] The technical solution adopted by the present invention is: an implant force-limiting digital wrench 10:1 contra-angle handpiece, comprising a rear cover component, a core component, a contra-angle handpiece housing, a transmission shaft component, and a reduction box force-limiting mechanism assembly component.

[0006] The rear cover component comprises a pressing cover, a conical spring, and a rear cover, wherein the small end of the conical spring is sleeved on the pressing cover, an inner buckle is arranged inside the rear cover, and the pressing cover and the conical spring are pressed into the rear cover to form a component;

[0007] The movement components include a bearing 1, a needle shaft core, and a needle two-petal spring. The needle two-petal spring is pressed into the needle shaft core through a tool. The needle shaft core is provided with an inner buckle to prevent the needle two-petal spring from falling out, and the bearing 1 is assembled at both ends of the needle shaft core;

[0008] The transmission shaft component comprises a lotus tooth with a rod, a second bearing, a straight rod shaft, a cylindrical pin, and a friction disc. The second bearing is assembled at both ends of the straight rod shaft. The lotus tooth with a rod passes through the second bearing and the straight rod shaft, and one end with a pin hole is exposed. The friction disc is assembled into the lotus tooth with a rod. The cylindrical pin is assembled in the transmission shaft component, and laser spot welding is used to prevent the cylindrical pin from falling out.

[0009] The reduction gearbox force limiting mechanism assembly components include bearing 1, cylindrical pin 1, dial, steel ball, steel ball chuck, cylindrical pin 2, steel ball pin limiting disk, cylindrical spring, force limiting guide, drive nut, force limiting structure housing, guide cylindrical pin, step pin, reduction gearbox housing, bearing inner ring top sleeve, rotating planetary frame, lubricating copper sleeve, gear pin, planetary gear, inner gear ring, center gear, bearing 3, lotus tooth, and housing end cover.

[0010] As a further improvement of the present invention, the gear pin is assembled into the rotating planetary carrier, the planetary gear is assembled into the rotating planetary carrier, the lubricating copper sleeve is assembled into the inner hole of the rotating planetary carrier, the center gear passes through the inner hole of the rotating planetary carrier, the bearing three is assembled into the bearing position of the center gear, the lotus tooth is assembled into the center gear, the cylindrical pin one is assembled into the components and is prevented from falling out by laser spot welding.

[0011] As a further improvement of the present invention, one bearing is assembled to the rotating planetary carrier shaft, another bearing is assembled to the outside of the reduction gear housing, the inner ring is assembled to the reduction gear housing, the assembled part of the center gear is assembled to the reduction gear housing, the bearing inner ring top sleeve is assembled to the rotating planetary carrier, and the cylindrical pin is spot welded by laser to prevent it from falling out.

[0012] As a further improvement of the present invention, the shell end cover is connected to the reduction gear housing by a thread, the step pin is assembled into the force limiting structure shell, and the above-mentioned part is assembled into the force limiting structure shell by a threaded connection, the driving nut is screwed into the corresponding thread of the force limiting structure shell, the force limiting guide is inserted into the rotating planetary carrier shaft, and the position is adjusted so that the pin hole is aligned with the U-shaped groove of the force limiting structure shell, the guide cylindrical pins are installed on both sides, the cylindrical spring is placed, the steel ball pin limiting disk is placed, the steel ball chuck is placed, the steel ball pin limiting disk is pushed open with a tool and the position is adjusted, the cylindrical pin 2 is assembled from the avoidance position in the force limiting structure shell to the pin hole, the steel ball pin limiting disk is released, and the pin cannot fall out under the action of the spring, the steel ball is placed in the steel ball hole, and the scale dial is assembled to the corresponding rib position of the driving nut to form a reduction gear box force limiting mechanism assembly component.

[0013] As a further improvement of the present invention, the reduction ratio in the reduction box force limiting mechanism assembly is 4:1, there is no reduction between the reduction box force limiting mechanism assembly and the transmission shaft assembly, the reduction ratio between the transmission shaft assembly and the movement assembly is 2.5:1, and the total reduction ratio of the entire bending machine head is 10:1.

[0014] As a further improvement of the present invention, when the torque needle rod is installed, the notched part of the torque needle rod is aligned with the corresponding step of the needle axis core and pushed upward, so that the head of the torque needle rod pushes open the two-petal spring of the needle, so that the torque needle rod slot is inserted into the boss of the two-petal spring of the needle; the pressing cover is pressed to compress the conical spring, and the pressing cover pushes open the two-petal spring of the needle, and then the torque needle rod is taken out, which is convenient for loading and unloading the needle bar and replacing other models of needle bars.

[0015] As a further improvement of the present invention, by rotating the dial, the cylindrical spring can be compressed to different degrees to provide different positive pressures, so that the steel ball and the friction disk produce different sliding friction forces under different torsion conditions, thereby realizing the force limiting function.

[0016] As a further improvement of the present invention, a corrugated gasket, a silicone pressure ring and a silicone pad are provided in the bending head housing. The silicone pad is pre-installed in the silicone pressure ring and assembled into the bending head housing together with the corrugated gasket; the movement component is assembled into the bending head housing; the rear cover component is assembled into the bending head housing and locked through a threaded connection; the transmission shaft component is assembled into the bending head housing and locked through a threaded connection; the reduction box force limiting mechanism assembly component is assembled into the bending head housing and locked through a threaded connection to complete the end face positioning and realize the assembly of the bending head.

[0017] As a further improvement of the present invention, the dial in the reduction gearbox force limiting mechanism assembly can be set to different torque values, so that when the load encounters resistance and reaches the set torque value, the steel ball and the friction plate will form relative rotation, avoiding overshoot and improving the accuracy of the output torque.

[0018] As a further improvement of the present invention, the semicircular groove in the shell end cover facilitates alignment and pressing with the steel ball of the handle, making the insertion and removal of the contra-angle handpiece head and the handle more convenient and secure.

[0019] Beneficial effects of the present invention: The present invention adopts a structure of a spring and a steel ball combination. When the machine is set to a certain output torque, the machine head is also set to the same torque value. Once the resistance torque of the needle bar terminal is greater than the set torque, the steel ball disk will rotate frictionally, thereby preventing overshoot and improving the accuracy of the output torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front view of a 10:1 angle handpiece of an implant force-limiting digital wrench of the present invention;

[0021] Figure 2 It is an axonometric view of a 10:1 angle handpiece of an implant force-limiting digital wrench of the present invention;

[0022] Figure 3 This is an exploded view of a 10:1 angle handpiece of a force-limiting digital wrench for implants of the present invention (I);

[0023] Figure 4 This is an exploded view (II) of a 10:1 angle handpiece of a force-limiting digital wrench for implants of the present invention;

[0024] Figure 5 It is a cross-sectional view of a 10:1 angle handpiece head of an implant force-limiting digital wrench according to the present invention.

[0025] As shown in the figure: 01, rear cover component; 02, movement component; 03, corrugated gasket; 04, silicone pressure ring; 05, silicone pad; 06, bending head housing; 07, transmission shaft component; 08, reduction box force limiting mechanism assembly component; 09, pressing cover; 10, conical spring; 11, rear cover; 12, bearing 1; 13, needle shaft core; 14, needle two-petal spring; 15, lotus tooth with rod; 16, bearing 2; 17, straight rod shaft; 18, cylindrical pin 1; 19, friction plate; 20, dial; 21 , steel ball; 22, steel ball chuck; 23, cylindrical pin two; 24, steel ball pin limit plate; 25, cylindrical spring; 26, force limiting guide; 27, drive nut; 28, force limiting structure housing; 29, guide cylindrical pin; 30, step pin; 31, reduction gear housing; 32, bearing inner ring top sleeve; 33, rotating planetary carrier; 34, lubricating copper sleeve; 35, gear pin; 36, planetary gear; 37, inner ring gear; 38, center gear; 39, bearing three; 40, lotus tooth; 41, housing end cover. DETAILED DESCRIPTION

[0026] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to their structure and are relative concepts. Therefore, they may change accordingly according to their different locations and different usage states; therefore, these or other directional terms should not be interpreted as restrictive terms.

[0027] The singular forms "a", "said" and "the" used in this specification are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and implementation methods. It should be understood that the implementation methods described herein are only used to explain this application and are not used to limit this application.

[0029] The present invention provides the following Figure 1-5 The implant force-limiting digital wrench 10:1 contra-angle handpiece shown comprises a rear cover component 01, a core component 02, a contra-angle handpiece housing 06, a transmission shaft component 07, and a reduction box force-limiting mechanism assembly component 08.

[0030] The rear cover component 01 includes a pressing cover 09, a conical spring 10, and a rear cover 11. The small end of the conical spring 10 is sleeved on the pressing cover 09. An inner buckle is provided in the rear cover 11. The pressing cover 09 and the conical spring 10 are pressed into the rear cover 11 to form a component.

[0031] The movement component 02 includes a bearing 12, a needle shaft core 13, and a needle two-petal spring 14. The needle two-petal spring 14 is pressed into the needle shaft core 13 through a tool. The needle shaft core 13 is provided with an inner buckle to prevent the needle two-petal spring 14 from falling out, and the bearing 12 is assembled at both ends of the needle shaft core 13.

[0032] The transmission shaft component 07 includes a lotus tooth with a rod 15, a bearing 2 16, a straight rod shaft 17, a cylindrical pin 18, and a friction disc 19. The bearing 2 16 is assembled at both ends of the straight rod shaft 17. The lotus tooth with a rod 15 passes through the bearing 2 16 and the straight rod shaft 17, and one end with a pin hole is exposed. The friction disc 19 is assembled into the lotus tooth with a rod 15. The cylindrical pin 18 is assembled in the transmission shaft component 07, and the cylindrical pin 18 is prevented from falling out by laser spot welding; the reduction gearbox force limiting mechanism assembly component 08 includes a bearing 12, a cylindrical pin 18, a dial 20, a steel ball 21, a steel ball chuck 22, a cylindrical pin 23, a steel ball pin limit plate 24, a cylindrical spring 25, and a force limiting guide Component 26, drive nut 27, force-limiting structure housing 28, guide cylindrical pin 29, step pin 30, reduction box housing 31, bearing inner ring top sleeve 32, rotating planetary carrier 33, lubricating copper sleeve 34, gear pin 35, planetary gear 36, inner gear ring 37, central gear 38, bearing three 39, lotus tooth 40, housing end cover 41, gear pin 35 is assembled into rotating planetary carrier 33, planetary gear 36 is assembled into rotating planetary carrier 33, lubricating copper sleeve 34 is assembled into the inner hole of rotating planetary carrier 33, central gear 38 is passed into the inner hole of rotating planetary carrier 33, bearing three 39 is assembled into the bearing position of central gear 38, lotus tooth 40 is assembled into central gear 38 The cylindrical pin 18 is assembled in the component and laser spot welded to prevent it from coming out. The bearing 12 is assembled to the shaft of the rotating planetary carrier 33. Another bearing 12 is assembled to the outside of the reduction gearbox housing 31. The inner gear ring 37 is assembled to the reduction gearbox housing 31. The assembled part of the central gear is assembled to the reduction gearbox housing 31. The bearing inner ring top sleeve 32 is assembled to the rotating planetary carrier 33. The cylindrical pin 18 is laser spot welded to prevent it from coming out. The housing end cover 41 is connected to the reduction gearbox housing 31 by threads. The step pin 30 is assembled to the force limiting structure housing 28, and the above parts are assembled to the force limiting structure housing 28 by threads. The drive nut 27 is screwed into the force limiting structure. At the corresponding threaded part of the shell 28, the force limiting guide part 26 is inserted into the rotating planetary carrier 33 axis, and the position is adjusted so that the pin hole is aligned with the U-shaped groove of the force limiting structure shell 28. The guide cylindrical pins 29 are installed on both sides, and the cylindrical spring 25 is inserted. The steel ball pin limiting disk 24 is inserted, and the steel ball chuck 22 is inserted. Use a tool to push open the steel ball pin limiting disk 24 and adjust the position. Assemble the cylindrical pin 23 from the avoidance position in the force limiting structure shell 28 to the pin hole, release the steel ball pin limiting disk 24, and under the action of the spring, the pin cannot fall out. The steel ball 21 is placed in the steel ball hole, and the dial 20 is assembled to the corresponding rib position of the drive nut 27 to form the reduction box force limiting mechanism assembly component 08.

[0033] The reduction ratio of the reduction box force limiting mechanism assembly component 08 of the present invention is 4:1, there is no reduction between the reduction box force limiting mechanism assembly component 08 and the transmission shaft component 07, the reduction ratio between the transmission shaft component 07 and the core component 02 is 2.5:1, and the total reduction ratio of the entire bending machine head is 10:1.

[0034] When the torque needle rod is installed in the present invention, the notch portion of the torque needle rod is aligned with the corresponding step of the needle clamping shaft core 13, and pushed upward, so that the head of the torque needle rod pushes open the two-petal spring 14 of the needle clamping needle, so that the torque needle rod clamping groove is clamped into the boss of the two-petal spring 14 of the needle clamping needle; the pressing cover 09 is pressed to compress the conical spring 10, and the pressing cover 09 pushes open the two-petal spring 14 of the needle clamping needle, and then the torque needle rod is taken out, which is convenient for loading and unloading the needle rod and replacing other types of needle rods.

[0035] The present invention can compress the cylindrical spring 25 to different degrees by rotating the dial 20, providing different positive pressures, so that the steel ball 21 and the friction plate 19 generate different sliding friction forces under different torsion conditions, thereby realizing the force limiting function.

[0036] The bending machine head housing 06 of the present invention is provided with a corrugated gasket 03, a silicone pressure ring 04 and a silicone pad 05. The silicone pad 05 is pre-installed in the silicone pressure ring 04 and assembled into the bending machine head housing 06 together, and the corrugated gasket 03 is placed; the movement component 02 is assembled into the bending machine head housing 06; the rear cover component 01 is assembled into the bending machine head housing 06 and locked through a threaded connection; the transmission shaft component 07 is assembled into the bending machine head housing 06 and locked through a threaded connection; the reduction box force limiting mechanism assembly component 08 is assembled into the bending machine head housing 06 and locked through a threaded connection, the end face positioning is completed, and the assembly of the bending machine head is realized.

[0037] The dial 20 in the reduction gearbox force limiting mechanism assembly 08 of the present invention can set different torque values, so that when the load encounters resistance and reaches the set torque value, the steel ball 21 and the friction plate 19 will form relative rotation to avoid overshoot and improve the accuracy of the output torque.

[0038] The semicircular groove in the housing end cover 41 of the present invention is convenient for alignment and pressing with the steel ball of the handle, making it more convenient and secure to plug and unplug the contra-angle handpiece head and the handle.

[0039] Working principle: (1) Torque setting: When the operator sets a certain output torque value, for example, 30N·cm, the cylindrical spring 25 can be compressed to different degrees by rotating the dial 20. Different positive pressures are provided by the compression of the cylindrical spring 25, so that the steel ball 21 and the friction disk 19 generate different sliding friction forces under different torque conditions. The rotation of the dial 20 can accurately set different torque values ​​to ensure that the torque output by the handpiece is consistent with the set value.

[0040] (2) Transmission process: The output of the motor is transmitted to the transmission shaft component 07 through the reduction box force limiting mechanism combination component 08. The reduction ratio in the reduction box force limiting mechanism combination component 08 is 4:1, which ensures the stability and accuracy of the output torque. The reduction ratio between the transmission shaft component 07 and the movement component 02 is 2.5:1, which further improves the reliability of the torque output. The total reduction ratio of the entire contra-angle machine head is 10:1, which ensures the stability and efficiency of the torque transmission process from the motor to the needle bar terminal.

[0041] (3) Force-limiting mechanism: During the tightening process of the base screw, if the needle bar terminal encounters resistance and the torque is greater than the set value, such as 30 N·cm, a sliding friction force will be generated between the steel ball 21 and the friction disk 19. The magnitude of the sliding friction force is controlled by the compression degree of the cylindrical spring 25, so that the friction force between the steel ball 21 and the friction disk 19 can be adjusted under different set torque conditions. Once the torque exceeds the set value, the steel ball disk will rotate by friction, thereby releasing the excess torque and preventing overshoot.

[0042] (4) Needle bar installation and removal: The installation and removal of the torque needle bar is very convenient. The notch of the torque needle bar is aligned with the corresponding step of the needle clamping shaft core 13, and the needle bar head can be pushed up to open the needle clamping two-petal spring 14, so that the needle bar clamping groove is inserted into the boss of the needle clamping two-petal spring 14. Press the pressing cover 09 to compress the conical spring 10, and the pressing cover 09 pushes the needle clamping two-petal spring 14, so that the needle bar can be easily removed, which is convenient for replacing different types of needle bars.

[0043] (5) Stability of mechanical structure: The contra-angle handpiece housing 06 is provided with a corrugated gasket 03, a silicone pressure ring 04 and a silicone pad 05. These components can provide good sealing and shock absorption effects, and improve the service life and stability of the contra-angle handpiece. Each component is locked by threaded connection to ensure the reliability and stability of the assembly.

[0044] (6) Handle connection: The semicircular groove design in the housing end cover 41 facilitates the alignment and pressing of the steel ball of the handle, making the insertion and removal of the contra-angle handpiece head and the handle more convenient and secure. The use of the step pin 30 further ensures the alignment of the contra-angle handpiece head and the handle, improving the reliability of the connection.

[0045] The 10:1 angle handpiece of the dental implant force-limiting digital wrench of the present invention not only has a significant improvement in the accuracy of the output torque, but also performs well in terms of ease of use and reliability. This design effectively solves the problems of inaccurate output torque and easy overshoot in the prior art, and improves the safety and success rate of dental surgery.

[0046] The above implementation modes are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned implementation modes, a person skilled in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the implementation modes of the present invention.

Claims

1. A 10:1 angle handpiece for a force-limited implant digital wrench, characterized in that: It comprises a rear cover component (01), a core component (02), a bending head housing (06), a transmission shaft component (07), and a reduction box force limiting mechanism assembly component (08). The rear cover component (01) comprises a pressing cover (09), a conical spring (10), and a rear cover (11); the small end of the conical spring (10) is sleeved on the pressing cover (09); an inner buckle is provided inside the rear cover (11); the pressing cover (09) and the conical spring (10) are pressed into the rear cover (11) to form a component; The movement component (02) includes a bearing 1 (12), a needle axis core (13), and a needle two-petal spring (14). The needle two-petal spring (14) is pressed into the needle axis core (13) by a tool. The needle axis core (13) is provided with an inner buckle to prevent the needle two-petal spring (14) from falling out. The bearing 1 (12) is assembled at both ends of the needle axis core (13). The transmission shaft component (07) comprises a lotus tooth with a rod (15), a second bearing (16), a straight rod shaft (17), a cylindrical pin (18), and a friction disc (19); the second bearing (16) is assembled at both ends of the straight rod shaft (17); the lotus tooth with a rod (15) passes through the second bearing (16) and the straight rod shaft (17), with one end with a pin hole exposed; the friction disc (19) is assembled into the lotus tooth with a rod (15); the cylindrical pin (18) is assembled into the transmission shaft component (07); laser spot welding is used to prevent the cylindrical pin (18) from falling out; The reduction box force limiting mechanism assembly component (08) comprises a bearing 1 (12), a cylindrical pin 1 (18), a graduated plate (20), a steel ball (21), a steel ball chuck (22), a cylindrical pin 2 (23), a steel ball pin limiting plate (24), a cylindrical spring (25), a force limiting guide (26), a driving nut (27), a force limiting structure housing (28), a guide cylindrical pin (29), a step pin (30), a reduction box housing (31), a bearing inner ring top sleeve (32), a rotating planetary carrier (33), a lubricating copper sleeve (34), a gear pin (35), a planetary gear (36), an inner gear ring (37), a central gear (38), a bearing 3 (39), a lotus tooth (40), and a housing end cover (41).

2. The implant force-limiting digital wrench 10:1 angle handpiece according to claim 1, characterized in that: The gear pin (35) is assembled into the rotating planetary frame (33), the planetary gear (36) is assembled into the rotating planetary frame (33), the lubricating copper sleeve (34) is assembled into the inner hole of the rotating planetary frame (33), the center gear (38) is inserted into the inner hole of the rotating planetary frame (33), the bearing three (39) is assembled into the bearing position of the center gear (38), the lotus tooth (40) is assembled into the center gear (38), and the cylindrical pin one (18) is assembled into the components and is spot welded by laser so that it cannot fall out.

3. The implant force-limiting digital wrench 10:1 angle handpiece according to claim 2, characterized in that: The bearing one (12) is assembled into the shaft of the rotating planetary carrier (33), another bearing one (12) is assembled into the outside of the reduction gearbox housing (31), the inner gear ring (37) is assembled into the reduction gearbox housing (31), the assembled part of the central gear is assembled into the reduction gearbox housing (31), the bearing inner ring top sleeve (32) is assembled onto the rotating planetary carrier (33), and the cylindrical pin one (18) is laser spot welded so that it cannot fall out.

4. The implant force-limiting digital wrench 10:1 contra-angle handpiece according to claim 3, characterized in that: The housing end cover (41) is connected to the reduction box housing (31) by threading, the step pin (30) is assembled into the force-limiting structure housing (28), and the above parts are assembled into the force-limiting structure housing (28) by threading, the drive nut (27) is screwed into the corresponding thread of the force-limiting structure housing (28), the force-limiting guide member (26) is inserted into the rotating planetary carrier (33) shaft, and the position is adjusted so that the pin hole is aligned with the U-shaped groove of the force-limiting structure housing (28), the guide cylindrical pins (29) are installed on both sides, and the cylindrical spring (2 5), insert the steel ball pin limit plate (24), insert the steel ball chuck (22), use a tool to push open the steel ball pin limit plate (24) and adjust the position, assemble the cylindrical pin 2 (23) from the avoidance position in the force limiting structure shell (28) into the pin hole, release the steel ball pin limit plate (24), and under the action of the spring, the pin cannot fall out, the steel ball (21) is placed in the steel ball hole, and the scale plate (20) is assembled to the corresponding rib position of the drive nut (27) to form a reduction gearbox force limiting mechanism assembly component (08).

5. The implant force-limiting digital wrench 10:1 contra-angle handpiece according to claim 1, characterized in that: The reduction ratio in the reduction box force limiting mechanism assembly component (08) is 4:1, there is no reduction between the reduction box force limiting mechanism assembly component (08) and the transmission shaft component (07), the reduction ratio between the transmission shaft component (07) and the core component (02) is 2.5:1, and the total reduction ratio of the entire contra-angle machine head is 10:

1.

6. The implant force-limiting digital wrench 10:1 contra-angle handpiece according to claim 1, characterized in that: When the torque needle rod is installed, the notch of the torque needle rod is aligned with the corresponding step of the needle clamping shaft core (13), and the rod is pushed upward, so that the head of the torque needle rod pushes open the two-petal spring (14) of the needle clamping, so that the torque needle rod clamping groove is clamped into the boss of the two-petal spring (14) of the needle clamping; the pressing cover (09) is pressed to compress the conical spring (10), and the pressing cover (09) pushes open the two-petal spring (14) of the needle clamping, and then the torque needle rod is taken out, so that it is convenient to load and unload the needle rod and replace the needle rod of other models.

7. The implant force-limiting digital wrench 10:1 contra-angle handpiece according to claim 1, characterized in that: By rotating the dial (20), the cylindrical spring (25) can be compressed to different degrees to provide different positive pressures, so that the steel ball (21) and the friction disk (19) generate different sliding friction forces under different torsion conditions, thereby realizing the force limiting function.

8. The implant force-limiting digital wrench 10:1 contra-angle handpiece according to claim 1, characterized in that: The bending machine head housing (06) is provided with a corrugated gasket (03), a silicone pressure ring (04), and a silicone pad (05); the silicone pad (05) is pre-installed in the silicone pressure ring (04), assembled together with the bending machine head housing (06), and the corrugated gasket (03) is placed; the core component (02) is assembled into the bending machine head housing (06); the rear cover component (01) is assembled into the bending machine head housing (06) and locked by threaded connection; the transmission shaft component (07) is assembled into the bending machine head housing (06) and locked by threaded connection; the reduction box force limiting mechanism assembly component (08) is assembled into the bending machine head housing (06) and locked by threaded connection, so as to complete the end face positioning and realize the assembly of the bending machine head.

9. The implant force-limiting digital wrench 10:1 contra-angle handpiece according to claim 1, characterized in that: The dial (20) in the reduction box force limiting mechanism assembly component (08) can be set to different torque values, so that when the load encounters resistance and reaches the set torque value, the steel ball (21) and the friction plate (19) will form relative rotation to avoid overshoot and improve the accuracy of the output torque.

10. The implant force-limiting digital wrench 10:1 angle handpiece according to claim 1, characterized in that: The semicircular groove in the housing end cover (41) is convenient for alignment and pressing with the steel ball of the handle, making it more convenient and secure to plug and unplug the contra-angle handpiece head from the handle.

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