Dental root canal bending machine

Abstract

The present invention belongs to the technical field of medical equipment, and specifically discloses a dental root canal bender, comprising a head housing, a core assembly and a core housing for accommodating the core assembly, the core housing being arranged at one end of the head housing, a transmission shaft for driving the core assembly to rotate being rotatably arranged in the head housing; the core assembly comprising a sleeve for clamping a turning needle, the sleeve being rotatably arranged in the core housing, two supports being arranged in mirror symmetry on the upper end surface of the sleeve, an active area being formed between the two supports, a core clamp ring for clamping the turning needle being slidably arranged in the active area, the side surface of the core clamp ring being arched upward to form a toggle portion, an annular groove and an avoidance groove being arranged on the outer side wall of the upper end of the sleeve, an elastic semi-ring body being sleeved in the annular groove, a stopper for limiting the horizontal movement of the core clamp ring being arranged at one end of the elastic semi-ring body, the stopper being located in the avoidance groove and abutting against the side surface of the core clamp ring away from the toggle portion. The turning needle is clamped by the core clamp ring, and it is easy to install and remove the turning needle, and the core clamp ring is not easy to deform and fail.

Description

Technical Field

[0001] The invention relates to the technical field of medical instruments, and in particular to a dental root canal bender. Background Art

[0002] The dental root canal bender is a common instrument in dental root canal treatment. It is a handheld tool that clamps the needle and rotates at high and low speeds to complete cutting, grinding and polishing of the tooth. It also has the function of measuring the depth of the tooth root canal.

[0003] During the use of dental root canal bender, the stability of the needle clamping and the convenience of loading and removing the needle are very important. The existing dental root canal bender uses the radial deformation of the chuck to clamp the needle, but it is difficult to ensure product consistency during the machining, heat treatment and assembly of the chuck, resulting in problems such as difficulty in loading and removing the needle and the inability to clamp the needle. Moreover, during use, as the chuck continues to deform, it is easy to cause the clamping function to fail, resulting in the root canal bender being unusable. In addition, when measuring the depth of the tooth root canal, the existing root canal bender uses a brush-type structure for conductivity, but the brush structure is easy to deform and not wear-resistant, and there is a situation where the conductivity is unstable and easy to fail during operation, affecting the treatment effect. Summary of the invention

[0004] In order to overcome the defects of the prior art, the present invention provides a dental root canal bender.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a dental root canal bender, comprising a head housing, a core assembly and a core housing for accommodating the core assembly, wherein the core housing is arranged at one end of the head housing, and a transmission shaft for driving the core assembly to rotate is rotatably arranged in the head housing;

[0006] The movement assembly includes a sleeve for tightening the needle, the sleeve is rotatably arranged in the movement housing, the upper end surface of the sleeve is provided with two supports arranged in a mirror-symmetrical manner, and an active area is formed between the two supports. A movement clamping ring for clamping the needle is slidably arranged in the active area, and the side surface of the movement clamping ring is arched upward to form a toggle portion. The outer side wall of the upper end of the sleeve is provided with an annular groove and an avoidance groove, and an elastic semi-ring body is sleeved in the annular groove. One end of the elastic semi-ring body is provided with a stopper for limiting the horizontal movement of the movement clamping ring, and the stopper is located in the avoidance groove and abuts against the side of the movement clamping ring away from the toggle portion.

[0007] Preferably, an eccentric step for engaging with a sewing needle is provided on the inner side wall of the movement clamp ring, and the eccentric step protrudes radially along the center of the movement clamp ring and its protruding width gradually decreases from top to bottom.

[0008] Preferably, the movement assembly further comprises a pressing cover and a cover seat, the upper end of the movement housing and the shaft sleeve form a receiving area A, the pressing cover is movably arranged in the receiving area A, a conductive spring is arranged between the pressing cover and the shaft sleeve, a fixing part is arranged in the middle of the end surface of the pressing cover, one end of the conductive spring is sleeved on the fixing part, and an extrusion part for cooperating with the toggle part and pushing the movement clamp ring to move horizontally along the active area is arranged on the inner side wall of the pressing cover;

[0009] The cover seat is screwed to the upper end of the movement shell, and the inner side wall of the upper end of the cover seat is provided with a second flange protruding radially toward the center of the cover seat end face, and the outer side wall of the lower end of the pressing cover is provided with a first flange protruding in the opposite direction of the center of the pressing cover end face.

[0010] Preferably, an elastic body for elastically supporting the pressing cover is provided in the accommodating area A, so that the first flange of the pressing cover abuts against the second flange of the cover seat.

[0011] Preferably, the lower end of the movement shell and the sleeve form a accommodating area B, and a conductive spring is provided in the accommodating area B. The conductive spring is in the shape of a circular ring with the middle area arched upward, the top of the conductive spring abuts against the lower end surface of the sleeve and the bottom of the conductive spring abuts against the lower end of the movement shell.

[0012] Preferably, primary gears are provided at both ends of the transmission shaft, gear teeth matching the primary gears are provided on the outer wall of the sleeve, and one end of the transmission shaft close to the movement assembly is arranged in contact with the gear teeth on the sleeve.

[0013] Preferably, it also includes a reduction gearbox assembly, which is screwed to one end of the head housing away from the movement housing, and the reduction gearbox assembly includes a housing, in which an input gear, an integrated sun gear, a first-stage planetary gear, a first-stage planetary carrier, a second-stage planetary gear, a second-stage planetary carrier and an output gear are sequentially connected in a transmission manner, the input gear is interference fit with one end of the integrated sun gear, and the output gear is interference fit with one end of the second-stage planetary carrier, and it also includes a guide pin, one end of the guide pin penetrates the first-stage planetary carrier, and the other end of the guide pin is embedded in the second-stage planetary carrier, and the output gear is arranged in contact with one end of the transmission shaft close to the reduction gearbox assembly.

[0014] Preferably, it also includes a shell unit, which is arranged at the threaded connection between the reduction gearbox assembly and the head shell, and an annular protrusion is provided on the inner wall of one end of the shell unit close to the head shell, and the annular protrusion radially protrudes toward the center of the end face of the shell unit and forms an annular limit step A with the inner wall of the shell unit, and a threaded barrel A is provided at one end of the head shell close to the reduction gearbox assembly, and the shell unit is sleeved on the threaded barrel A through the annular protrusion, and a threaded barrel B is provided at one end of the box body close to the head shell, and the threaded barrel B forms an annular limit step B with the outer wall of the box body, and the threaded barrel B is threadedly connected to the threaded barrel A and the annular limit step B of the box body abuts against the annular limit step A of the shell unit.

[0015] Preferably, the axial width of the annular protrusion is greater than the axial width of the threaded barrel A.

[0016] The beneficial effects of the present invention are:

[0017] 1. When in use, push the needle into the sleeve and turn the toggle part at the same time, so that the movement clamp ring moves horizontally along the active area, and the movement clamp ring squeezes the stopper, further deforming the elastic semi-ring body to generate elastic force. When the movement clamp ring is coaxial with the through hole of the sleeve, the needle will completely enter the sleeve, loosen the toggle part, and the movement clamp ring will be pushed back to its original position by the elastic semi-ring body, clamping the needle. It is easy to install and remove the needle, and the movement clamp ring will not easily deform and fail, so it can be used continuously.

[0018] 2. A conductive spring and a conductive spring are respectively arranged above and below the sleeve to form conductive paths 1 and 2, which are stable. When the sleeve rotates, the conductive spring may be deformed, causing conductive path 1 to be interrupted. At this time, conductive path 2 is still connected, and the depth of the tooth root canal can still be measured without interrupting the treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 An exploded view of an embodiment of the present invention;

[0020] Figure 2 is a cross-sectional view of an embodiment of the present invention;

[0021] Figure 3 A three-dimensional diagram of a shaft sleeve in an embodiment of the present invention;

[0022] Figure 4 A three-dimensional diagram of a movement clamp ring in an embodiment of the present invention;

[0023] Figure 5 A three-dimensional diagram of an elastic semi-ring body in an embodiment of the present invention;

[0024] Figure 6 for Figure 2 The enlarged view of point A in the middle;

[0025] Figure 7 is a cross-sectional view of a movement assembly according to an embodiment of the present invention;

[0026] Figure 8 This is a state diagram of inserting a needle in an embodiment of the present invention;

[0027] Fig. 9 This is a state diagram of the needle being placed in place in the embodiment of the present invention;

[0028] Fig.10 This is a state diagram of removing the needle in an embodiment of the present invention;

[0029] Fig.11 is a three-dimensional cutaway diagram of an embodiment of the present invention;

[0030] Fig.12 is a cross-sectional view of a conductive path 1 according to an embodiment of the present invention;

[0031] Fig.13 is a cross-sectional view of a conductive path 2 according to an embodiment of the present invention;

[0032] Fig.14 A three-dimensional diagram of a conductive spring in an embodiment of the present invention;

[0033] Fig.15 is a cross-sectional view of a reduction gearbox assembly according to an embodiment of the present invention;

[0034] Fig.16 A three-dimensional diagram of a guide pin in an embodiment of the present invention;

[0035] Fig.17 for Figure 2 Enlarged view of point B in the middle.

[0036] In the figure:

[0037] 1-head housing, 11-transmission shaft, 111-primary gear, 12-threaded barrel A;

[0038] 2- Movement housing;

[0039] 3- movement assembly, 31- shaft sleeve, 311- support, 312- active area, 313- annular groove, 314- avoidance groove, 315- gear teeth, 32- movement clamping ring, 321- toggle part, 322- eccentric step, 33- elastic semi-ring body, 331- blocking part, 34- pressing cover, 341- fixing part, 342- extrusion part, 343- first flange, 35- cover seat, 351- second flange, 36- conductive spring, 37- elastic body, 38- conductive spring;

[0040] 4- Accommodation area A;

[0041] 5- Accommodation area B;

[0042] 6-reduction box assembly, 61-box body, 611-threaded cylinder B, 612-annular limiting step B, 62-input gear, 63-integrated sun gear, 64-first-stage planetary gear, 65-first-stage planetary carrier, 66-second-stage planetary gear, 67-second-stage planetary carrier, 68-output gear, 69-guide pin;

[0043] 7-housing unit, 71-annular protrusion, 72-annular limiting step A;

[0044] 8- Needle. DETAILED DESCRIPTION

[0045] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. Example

[0046] As attached Figures 1 to 7 As shown, a dental root canal bending machine provided by the present invention includes a head housing 1, a movement assembly 3 and a movement housing 2 for accommodating the movement assembly 3. The movement housing 2 is arranged at one end of the head housing 1. A transmission shaft 11 for driving the movement assembly 3 to rotate is rotatably provided in the head housing 1. When the transmission shaft 11 rotates, it drives the movement assembly to rotate to achieve the treatment effect of the root canal bending machine.

[0047] The movement assembly 3 includes a sleeve 31 for tightening the needle 8. The sleeve 31 is rotatably arranged in the movement housing 2. The upper end surface of the sleeve 31 is provided with two supports 311 arranged in a mirror-symmetrical manner. An active area 312 is formed between the two supports 311. A movement clamp ring 32 for clamping the needle 8 is slidably arranged in the active area 312. The side of the movement clamp ring 32 is arched upward to form a toggle portion 321. The outer side wall of the upper end of the sleeve 31 is provided with an annular groove 313 and an avoidance groove 314. An elastic semi-ring body 33 is sleeved in the annular groove 313. A stopper 331 for limiting the horizontal movement of the movement clamp ring 32 is provided at one end of the elastic semi-ring body 33. The stopper 331 is located in the avoidance groove 314 and abuts against the side of the movement clamp ring 32 away from the toggle portion 321. When in use, the needle 8 is pushed into the sleeve 31, and the toggle part 321 is toggled, so that the movement clamping ring 32 moves horizontally along the active area 312, so that the movement clamping ring 32 squeezes the stopper 331, and further deforms the elastic semi-ring body 33 to generate elastic force. When the movement clamping ring 32 is coaxial with the through hole of the sleeve 31, the needle 8 is completely inserted into the sleeve 31, and the toggle part 321 is released, so that the movement clamping ring 32 is pushed by the elastic semi-ring body 33 to reset, and the needle 8 is clamped, which is simple and convenient. At the same time, the movement clamping ring 32 will not easily deform and fail, and can be used continuously.

[0048] Specifically, an eccentric step 322 for engaging with the needle 8 is provided on the inner wall of the movement clamp ring 32. The eccentric step 322 protrudes radially along the center of the movement clamp ring 32 and its protruding width gradually decreases from top to bottom to form an inclined surface. When in use, the needle 8 is pushed into the sleeve 31, and the top of the needle 8 rests on the inclined surface of the eccentric step 322. The top of the needle 8 continues to press the eccentric step 322, so that the movement clamp ring 32 moves horizontally along the active area 312, further squeezing the stopper 331, so that the elastic semi-ring body 33 is deformed. When the movement clamp ring 32 is coaxial with the through hole of the sleeve 31, the needle 8 completely enters the sleeve 31. The existing needles 8 are basically provided with a locking groove. Therefore, after the needle 8 is completely inserted into the sleeve 31, the movement clamping ring 32 is reset under the push of the elastic semi-ring body 33, so that the eccentric step 322 is locked with the locking groove on the needle 8. At the same time, the movement clamping ring 32 is further clamped with the needle 8 under the elastic force of the elastic semi-ring body 33. The needle 8 is placed in place. When the sleeve 31 rotates, the needle 8 and the sleeve 31 have a good integration effect, which reduces the wear of the needle 8 and the movement clamping ring 32, prevents the movement clamping ring 32 from deformation and failure, further clamps the needle 8, and makes it more convenient to install and remove the needle 8.

[0049] To be more specific, the movement assembly 3 also includes a pressing cover 34 and a cover seat 35. The upper end of the movement housing 2 and the shaft sleeve 31 form an accommodating area A4. The pressing cover 34 is movably arranged in the accommodating area A4. A conductive spring 36 is provided between the pressing cover 34 and the shaft sleeve 31. A fixing portion 341 is provided in the middle of the end face of the pressing cover 34. One end of the conductive spring 36 is sleeved on the fixing portion 341, and an extrusion portion 342 for cooperating with the toggle portion 321 and pushing the movement clamp ring 32 to move horizontally along the active area 312 is provided on the inner side wall of the pressing cover 34; the cover seat 35 is screwed to the upper end of the movement housing 2, and a second flange 351 is provided on the inner side wall of the upper end of the cover seat 35, which radially protrudes toward the center of the end face of the cover seat 35, and a first flange 343 is provided on the outer side wall of the lower end of the pressing cover 34, which protrudes in the opposite direction to the center of the end face of the pressing cover 34.

[0050] It should be noted that the conductive spring 36 has the function of conducting electricity on the one hand and also has the function of a spring on the other hand. When the needle 8 is placed in place, the top of the needle 8 abuts against the conductive spring 36, and the conductive spring 36 is deformed, further squeezing the pressing cover 34, so that the first flange 343 on the pressing cover 34 abuts against the second flange 351 of the cover seat 35. When the needle 8 needs to be taken out, the pressing cover 34 is pressed, so that the squeezing portion 342 of the pressing cover 34 squeezes the toggle portion 321, pushing the movement clamping ring 32 to move horizontally along the active area 312, so that the eccentric step 322 of the movement clamping ring 32 is separated from the positioning groove. When the movement clamping ring 32 is coaxial with the through hole of the shaft sleeve 31, the needle 8 can be taken out. The structure is relatively simple, and the installation and removal of the needle 8 is convenient and quick.

[0051] As attached Figure 8 The figure shows the state when the needle 8 is inserted.

[0052] As attached Fig. 9 As shown, the needle 8 is in place.

[0053] As attached Fig.10 As shown, the needle 8 is taken out.

[0054] Furthermore, as attached Figure 7 and attached Fig.11 As shown, an elastic body 37 for elastically supporting the pressing cover 34 is provided in the accommodation area A4, so that the first flange 343 of the pressing cover 34 abuts against the second flange 351 of the cover seat 35. The elastic body 37 is added, such as a common spring or a ring-shaped elastic sheet with an upwardly arched middle area, to support the pressing cover 34, so that the pressing effect of the pressing cover 34 is more stable, and when the needle 8 is installed and removed, the needle 8 is less likely to get stuck.

[0055] More specifically, as Figure 7 , Attachment Fig.11 and attached Fig.14 As shown, the lower end of the movement housing 2 and the sleeve 31 form a receiving area B5, and a conductive spring piece 38 is provided in the receiving area B5. The conductive spring piece 38 is in a circular ring shape with the middle area arched upward. The top of the conductive spring piece 38 abuts against the lower end surface of the sleeve 31 and the bottom of the conductive spring piece 38 abuts against the lower end of the movement housing 2.

[0056] It should be noted that the conductive spring sheet 38 has a conductive function on the one hand, and also has a function of a spring sheet, elastically supporting the sleeve 31, so that the rotation of the sleeve 31 is more stable, reducing the up and down movement of the sleeve 31 during rotation, which causes wear between the needle 8 and the movement clamp ring 32, and causes the movement clamp ring 32 to deform and fail to clamp the needle 8.

[0057] In addition, as attached Fig.12As shown, when the needle 8 is placed in place, the root canal bender not only uses the needle 8 to process the tooth, but also uses the needle 8 to measure the root canal depth of the tooth. The head housing 1, the movement housing 2, the cover seat 35, the pressing cover 34, the conductive spring 36 and the needle 8 are connected to form a conductive path 1. When measuring, it should be combined with a root canal measuring instrument, which is not shown in the figure.

[0058] At the same time, if attached Fig.13 As shown, the head housing 1, the movement housing 2, the conductive spring 38, the sleeve 31 and the needle 8 are connected to form a conductive path 2. When measuring, it is necessary to combine with a root canal measuring instrument, which is not shown in the figure. When the sleeve 31 rotates, the conductive path 1 may be interrupted due to the deformation of the conductive spring 36. At this time, the conductive path 2 is still connected, and the depth of the tooth root canal can still be measured without interrupting the treatment effect.

[0059] Furthermore, first-stage gears 111 are provided at both ends of the transmission shaft 11, and gear teeth 315 adapted to the first-stage gear 111 are provided on the outer wall of the sleeve 31. One end of the transmission shaft 11 close to the movement assembly 3 is arranged in contact with the gear teeth 315 on the sleeve 31. When the transmission shaft 11 rotates, it drives the sleeve 31 to rotate.

[0060] Further, as attached Fig.15 , Attachment Fig.16 As shown, it also includes a reduction box assembly 6, which is screwed to the end of the head housing 1 away from the movement housing 2. The reduction box assembly 6 includes a housing 61, and the housing 61 is sequentially connected with an input gear 62, an integrated sun gear 63, a primary planetary gear 64, a primary planetary carrier 65, a secondary planetary gear 66, a secondary planetary carrier 67 and an output gear 68. The input gear 62 is interference fit with one end of the integrated sun gear 63, and the output gear 68 is interference fit with one end of the secondary planetary carrier 67. It also includes a guide pin 69, one end of the guide pin 69 penetrates the primary planetary carrier 65, and the other end of the guide pin 69 is nested in the secondary planetary carrier 67, and the output gear 68 is arranged in contact with one end of the transmission shaft 11 close to the reduction box assembly 6.

[0061] It should be noted that the guide pin 69, the primary planetary carrier 65 and the secondary planetary carrier 67 are coaxial. During the operation of the reduction gearbox assembly 6, the guide pin 69 limits the rotation between the primary planetary carrier 65 and the secondary planetary carrier 67, so that the primary planetary carrier 65 and the secondary planetary carrier 67 rotate more stably, and the torque transmission between the two is smoother, so that the tooth transmission between the output gear 68 and the transmission shaft 11 is more stable, and thus the rotation of the sleeve 31 is more stable, which reduces the up and down movement or uneven rotation of the sleeve 31 during rotation, thereby reducing the wear between the needle 8 and the movement clamp ring 32, and causing the movement clamp ring 32 to deform and fail to clamp the needle 8.

[0062] Further, attached Figure 1 , Attachment Figure 2 and attached Fig.17 As shown, it also includes an outer shell unit 7, which is arranged at the threaded connection between the reduction gearbox assembly 6 and the head shell 1. An annular protrusion 71 is provided on the inner wall of one end of the outer shell unit 7 close to the head shell 1. The annular protrusion 71 radially protrudes toward the center of the end face of the outer shell unit 7 and forms an annular limiting step A72 with the inner wall of the outer shell unit 7. A threaded barrel A12 is provided at one end of the head shell 1 close to the reduction gearbox assembly 6. The axial width of the annular protrusion 71 is greater than the axial width of the threaded barrel A12. The outer shell unit 7 is sleeved on the threaded barrel A12 through the annular protrusion 71. A threaded barrel B611 is provided at one end of the box body 61 close to the head shell 1. The threaded barrel B611 and the outer wall of the box body 61 form an annular limiting step B612. The threaded barrel B611 is threadedly connected to the threaded barrel A12 and the annular limiting step B612 of the box body 61 abuts against the annular limiting step A72 of the outer shell unit 7.

[0063] It should be noted that when installing the root canal bender, the outer shell unit 7 is first sleeved on the threaded barrel A12, and then the threaded barrel B611 of the box body 61 is screwed with the threaded barrel A12 of the head housing 1. Since the axial width of the annular protrusion 71 is greater than the axial width of the threaded barrel A12, the annular limiting step B612 of the box body 61 abuts against the annular limiting step A72 of the outer shell unit 7. Therefore, when the reduction box assembly 6 and the head housing 1 are tightened, the extrusion effect of the annular limiting step B612 and the annular limiting step A72 is stronger, generating an axial force to react on the screw connection between the threaded barrel A12 and the threaded barrel B611. In this way, during the high-speed rotation of the reduction box assembly 6, the transmission effect of the output gear 68 and the transmission shaft 11 is more stable, and further acts on the sleeve 31, so that the rotation of the sleeve 31 is more stable, the clamping effect of the needle 8 and the movement clamp ring 32 is better, and wear is reduced.

[0064] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A dental root canal bender, characterized in that: The invention comprises a machine head housing (1), a movement assembly (3) and a movement housing (2) for accommodating the movement assembly (3); the movement housing (2) is arranged at one end of the machine head housing (1); a transmission shaft (11) for driving the movement assembly (3) to rotate is rotatably arranged in the machine head housing (1); The movement assembly (3) comprises a shaft sleeve (31) for clamping the turning needle (8), the shaft sleeve (31) being rotatably arranged in the movement housing (2), the upper end surface of the shaft sleeve (31) being provided with two mirror-symmetrically arranged seats (311), an active area (312) being formed between the two seats (311), a movement clamping ring (32) for clamping the turning needle (8) being slidably arranged in the active area (312), the side surface of the movement clamping ring (32) being arched upwards to form A toggle portion (321), an annular groove (313) and an avoidance groove (314) are provided on the outer side wall of the upper end of the shaft sleeve (31), an elastic semi-ring body (33) is sleeved in the annular groove (313), one end of the elastic semi-ring body (33) is provided with a stopper (331) for limiting the horizontal movement of the movement clamping ring (32), the stopper (331) is located in the avoidance groove (314) and abuts against the side of the movement clamping ring (32) away from the toggle portion (321); An eccentric step (322) for engaging with the needle (8) is provided on the inner side wall of the movement clamp ring (32), wherein the eccentric step (322) protrudes radially along the center of the movement clamp ring (32) and its protruding width gradually decreases from top to bottom; The movement assembly (3) further comprises a pressing cover (34) and a cover seat (35); the upper end of the movement housing (2) and the shaft sleeve (31) form a receiving area A (4); the pressing cover (34) is movably arranged in the receiving area A (4); a conductive spring (36) is arranged between the pressing cover (34) and the shaft sleeve (31); a fixing portion (341) is arranged in the middle of the end surface of the pressing cover (34); one end of the conductive spring (36) is sleeved on the fixing portion (341); and a pressing portion (342) is arranged on the inner side wall of the pressing cover (34) for cooperating with the toggle portion (321) and pushing the movement clamping ring (32) to move horizontally along the moving area (312); The cover seat (35) is screwed to the upper end of the movement housing (2), and a second flange (351) is provided on the inner side wall of the upper end of the cover seat (35) and radially protrudes toward the center of the end face of the cover seat (35), and a first flange (343) is provided on the outer side wall of the lower end of the pressing cover (34) and protrudes in the opposite direction to the center of the end face of the pressing cover (34); An elastic body (37) for elastically supporting the pressing cover (34) is provided in the accommodating area A (4), so that the first flange (343) of the pressing cover (34) abuts against the second flange (351) of the cover seat (35); The lower end of the movement housing (2) and the shaft sleeve (31) form a receiving area B (5), and a conductive spring sheet (38) is provided in the receiving area B (5). The conductive spring sheet (38) is in the shape of a ring with an upward arch in the middle area, and the top of the conductive spring sheet (38) abuts against the lower end surface of the shaft sleeve (31) and the bottom of the conductive spring sheet (38) abuts against the lower end of the movement housing (2).

2. A dental root canal bender according to claim 1, characterized in that: Both ends of the transmission shaft (11) are provided with first-stage gears (111), the outer wall of the shaft sleeve (31) is provided with gear teeth (315) adapted to the first-stage gear (111), and one end of the transmission shaft (11) close to the movement assembly (3) is arranged in contact with the gear teeth (315) on the shaft sleeve (31).

3. The dental root canal bender according to claim 1, characterized in that: The invention also comprises a reduction box assembly (6), wherein the reduction box assembly (6) is screwed to one end of the head housing (1) away from the movement housing (2), and the reduction box assembly (6) comprises a housing (61), wherein an input gear (62), an integrated sun gear (63), a first-stage planetary gear (64), a first-stage planetary carrier (65), a second-stage planetary gear (66), a second-stage planetary carrier (67) and an output gear (68) are sequentially connected in a transmission manner in the housing (61), wherein the input gear (62) is interference-fitted with one end of the integrated sun gear (63), and the output gear (68) is interference-fitted with one end of the second-stage planetary carrier (67), and further comprises a guide pin (69), wherein one end of the guide pin (69) penetrates the first-stage planetary carrier (65), and the other end of the guide pin (69) is nested in the second-stage planetary carrier (67), and the output gear (68) is contact-arranged with one end of the transmission shaft (11) close to the reduction box assembly (6).

4. A dental root canal bender according to claim 3, characterized in that: The machine head housing (1) further comprises a housing unit (7), wherein the housing unit (7) is arranged at the screw connection between the reduction box assembly (6) and the machine head housing (1), and an annular protrusion (71) is provided on the inner wall of one end of the housing unit (7) close to the machine head housing (1), and the annular protrusion (71) radially protrudes toward the center of the end face of the housing unit (7) and forms an annular limiting step A (72) with the inner wall of the housing unit (7), and a threaded barrel A (12) is provided on one end of the machine head housing (1) close to the reduction box assembly (6). The shell unit (7) is sleeved on the threaded barrel A (12) through an annular protrusion (71), and a threaded barrel B (611) is provided at one end of the box body (61) close to the head shell (1), and the threaded barrel B (611) and the outer wall of the box body (61) form an annular limiting step B (612), and the threaded barrel B (611) is threadedly connected to the threaded barrel A (12), and the annular limiting step B (612) of the box body (61) abuts against the annular limiting step A (72) of the outer shell unit (7).

5. The dental root canal bender according to claim 4, characterized in that: The axial width of the annular protrusion (71) is greater than the axial width of the threaded barrel A (12).

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