Guide pipe end deburring cutter and deburring method

Abstract

The invention provides a guide pipe end deburring tool and a deburring method. The guide pipe end deburring tool comprises a tail handle, a shell, a first spring, a second spring, an outer tool bit, an inner tool bit and a pin. One end of the tail handle is connected with the clamping end of the speed-adjustable electric drill, and the other end is located in the cavity of the shell and fixedly connected with one end of the shell; the inner tool bit is located in the outer tool bit, and the first spring and the second spring are arranged on a body at the other end of the tail handle in a stacked and sleeved mode and limited between the end face of the middle section of the tail handle and the end face of the outer tool bit. The shell, the outer tool bit and the inner tool bit are fixed in the radial direction through pins, and the pins can slide along long-strip-shaped holes in the side walls of the shell and the outer tool bit. Inner conical cutter teeth and outer conical cutter teeth are arranged at the ends, away from the spring, of the outer cutter head and the inner cutter head correspondingly, under driving of an external speed-adjustable drill bit, burrs on the outer circle and the inner circle of the end face of the guide pipe can be removed at the same time, quality consistency is high, operation is easy, and efficiency is high.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft catheter manufacturing, and in particular relates to a catheter end deburring tool and a deburring method. Background Art

[0002] The conduit is an important connector in the mechanical connection of the aircraft. When installing on the aircraft, the conduit needs to be connected together through the nut and flat nozzle installed on the conduit to connect the pipelines on the aircraft, thereby realizing the relevant functions of the aircraft. During the overhaul of the aircraft, the manufacture of the conduit is an indispensable process. During the manufacturing process, the conduit needs to be expanded with a bell mouth to ensure good contact between the rear end faces of each conduit connection and ensure its stable performance.

[0003] To ensure the quality of the expansion of the catheter bell mouth, it is necessary to ensure that the burrs on the catheter end are completely removed and the rest of the catheter matrix cannot be damaged. Therefore, correctly and efficiently removing the burrs on the catheter end is an important part of catheter quality assurance. In the process of removing the burrs on the catheter end, the current method is to first use a triangular scraper and a trimmer to remove the burrs on the inner diameter of the catheter end, and then use a flat file to remove the burrs on the outer diameter of the catheter end. This method has many processes and requires frequent tool changes. In addition, manual deburring is time-consuming and inefficient, and requires high personal skills. Different operators have different quality in removing the burrs on the catheter end, and the operation effect is poor. Especially in large-scale manufacturing and replacement, it is time-consuming and labor-intensive, and the quality is unstable. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of complicated and cumbersome process, low efficiency and inconsistent quality of the existing catheter end deburring method, and to provide a catheter end deburring tool and a deburring method.

[0005] To achieve the above purpose, the technical solution provided by the present invention is:

[0006] A catheter end deburring tool, characterized in that it comprises a tail handle, a housing, a first spring, a second spring, an outer cutter head, an inner cutter head and a pin;

[0007] The tail handle is coaxially fixedly mounted at one end of the housing, and one end of the tail handle is used to connect to an external adjustable speed electric drill, and the other end of the tail handle is located in a cavity at one end of the housing;

[0008] The inner cutter head and the outer cutter head are sequentially inserted into the cavity at the other end of the outer shell from the inside to the outside, the outer cutter head can slide axially along the cavity of the outer shell, and the inner cutter head can slide axially along the inner cavity of the outer cutter head;

[0009] The side wall of the shell and the side wall of the outer cutter head are respectively provided with a first long hole and a second long hole in the axial direction, and the side wall of the inner cutter head is provided with a pin mounting hole, and the pin passes through the first long hole, the second long hole and the pin mounting hole in sequence, and the shell, the outer cutter head and the inner cutter head are radially connected, so that the shell, the outer cutter head and the inner cutter head can rotate synchronously under the drive of an external adjustable speed electric drill, and the pin can slide along the first long hole and the second long hole;

[0010] The outer cutter head and the inner cutter head are provided with a coaxial tapered hole and a tapered cone that expand outwards and contract gradually at one end away from the first spring and the second spring, respectively. The cone is located in the tapered hole, and a circle of outer cutter teeth and inner cutter teeth are processed on the inner circumference of the tapered hole and the outer circumference of the cone, respectively. The outer cutter teeth and the inner cutter teeth are used to contact the outer burr and the inner burr of the catheter end, respectively.

[0011] The first spring and the second spring are overlapped on the other end of the tail handle from the inside to the outside. In the initial state, the first spring and the second spring are in a stretched state, and are used to provide pre-pressure to the inner cutter head and the outer cutter head respectively during non-working period, so that the inner cutter head and the outer cutter head are fixed in corresponding positions of the shell; the first spring and the second spring are also used to provide thrust to the inner cutter head and the outer cutter head respectively during working period, so that the outer cutter teeth and the inner cutter teeth can remove the outer circle burrs and the inner circle burrs of the catheter end at the same time, and the outer circle and the inner circle have the same size after the burrs are removed.

[0012] Furthermore, the outer burr and the inner burr on the end of the catheter are respectively perpendicular to the outer circumferential surface and the inner circumferential surface of the catheter;

[0013] The taper of the tapered hole on the outer cutter head and the taper of the cone on the inner cutter head are both 60°.

[0014] Furthermore, the included angle between the inner cutter teeth and the generatrix of the tapered hole is 30°; the included angle between the outer cutter teeth and the generatrix of the cone is 30°.

[0015] Furthermore, when the two end surfaces of the outer cutter head and the inner cutter head are respectively flush, the large end of the cone is located in the tapered hole, and the distance from the large end of the cone to the small end of the tapered hole is 0-5 mm.

[0016] Furthermore, the housing is in a rotary shape, and its cavity is a central through hole opened along the axis, an inner wall at one end of the central through hole is provided with an internal thread, and the other end of the central through hole is a stepped hole for mounting the outer cutter head;

[0017] The first elongated hole is arranged on the side wall of the shell near the installation positions of the outer blade head and the inner blade head.

[0018] Furthermore, the tail handle comprises a first cylinder, an end cover, a stud and a second cylinder which are coaxially fixed in sequence; the first cylinder is used to be connected to the clamping end of the adjustable speed electric drill;

[0019] The stud and the second cylinder are located at one end of the central through hole of the shell, and the stud is connected with the internal thread of the inner wall of the shell, and the end cover is fitted with the end surface of one end of the shell;

[0020] The first spring and the second spring are stacked on the second cylinder, the two ends of the first spring are limited between the end face of the stud and the large end face of the inner cutter head, and the two ends of the second spring are limited between the end face of the stud and the large end face of the outer cutter head.

[0021] Further, the inner cavity of the outer cutter head comprises a second column hole and a first column hole which are coaxially connected to the tapered hole in sequence, and the inner diameter of the first column hole is larger than the inner diameter of the second inner hole;

[0022] The second elongated hole is formed on the side wall of the outer blade head at a position close to the first column hole.

[0023] Further, the inner cutter head comprises a second cylinder and a first cylinder which are coaxially connected to the cone in sequence, and the outer diameter of the first cylinder is greater than the outer diameter of the second cylinder;

[0024] The first column matches the first column hole of the outer cutter head;

[0025] A blind hole is provided on the inner cutter head along the axis from the end surface of the first cylinder, and the depth of the blind hole is determined according to the set spring compression amount; the blind hole is used to make way for the second cylinder of the tail handle when the inner cutter head moves along the axial direction;

[0026] The pin installation hole is arranged on the side wall of the second column, and comprises a coaxially connected cylindrical hole and a screw hole.

[0027] Furthermore, the material of the inner cutter head and the outer cutter head is DC53.

[0028] The deburring method using the above-mentioned catheter end deburring tool comprises the following steps:

[0029] Step 1, fix the catheter on a bench vise, with the end to be deburred facing the deburring tool;

[0030] Step 2, install the tail handle on the clamping end of the adjustable speed electric drill, and set the speed of the adjustable speed electric drill;

[0031] Step 3, holding a speed-adjustable electric drill, push one end of the deburring tool with the outer cutter head and the inner cutter head installed into the catheter along the catheter axis, until the outer circle and the inner circle of the catheter end face respectively collide with the outer cutter head and the inner cutter head;

[0032] Step 4, start the adjustable speed electric drill, rotate the tail handle and the outer shell, drive the inner cutter head and the outer cutter head to rotate synchronously, and remove the inner burr and the outer burr of the catheter end at the same time;

[0033] Step 5, visually inspect the catheter several times until the inner and outer burrs of the catheter end are completely removed.

[0034] The advantages of the present invention are:

[0035] 1. The present invention designs an inner cutter head and an outer cutter head, and the inner cutter head is coaxially installed in the inner hole of the outer cutter head. When in use, the end of the catheter is placed at the blade position of the inner cutter head and the outer cutter head, so that the outer end face of the catheter contacts the blade of the outer cutter head, and the inner end face of the catheter contacts the blade of the inner cutter head. The deburring tool cooperates with an external adjustable speed electric drill to completely remove the burrs on the inner and outer surfaces of the catheter end at one time, and after the burrs are removed, each cross section of the catheter end is uniform, and the quality consistency is high.

[0036] 2. The deburring tool of the present invention is suitable for catheters of the same model but different diameters. The process is simple and the working efficiency is doubled compared with the traditional method. It is particularly suitable for batch removal of burrs on the catheter ends.

[0037] 3. When the cutter of the present invention is used to remove burrs from the end of a catheter, the operation is simple and there is no need to consider the operator's personal skill level. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall appearance of the aircraft catheter end deburring tool of the present invention;

[0039] Figure 2 It is a cross-sectional view of a deburring tool for an aircraft catheter end of the present invention;

[0040] Figure 3 It is a schematic diagram of the structure of the caudal stalk in the present invention;

[0041] Figure 4 It is a perspective view of the three-dimensional structure of the housing in the present invention;

[0042] Figure 5 It is a schematic diagram of the first spring structure in the present invention;

[0043] Figure 6 is a perspective view of the three-dimensional structure of the outer cutter head of the present invention;

[0044] Figure 7 It is a schematic diagram of the structure of the inner cutter head in the present invention;

[0045] Figure 8 It is a schematic diagram of the structure of the pin in the present invention;

[0046] Fig. 9It is a schematic diagram of the cooperation between the catheter end deburring tool and the aircraft catheter in an embodiment of the present invention.

[0047] Explanation of the reference numerals: 1-tail handle, 101-first cylinder, 102-end cover, 103-stud, 104-second cylinder; 2-housing, 3-first spring, 4-second spring, 5-outer cutter head, 6-inner cutter head, 601-first cylinder, 602-second cylinder, 603-cone, 7-pin, 8-aircraft guide tube. DETAILED DESCRIPTION

[0048] Embodiments of the present invention are described in detail below. The embodiments are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0049] Reference Figure 1-Figure 2 In order to ensure the consistency of the inner and outer circle sizes after removing the inner and outer burrs of the catheter end, an embodiment of the present invention provides a catheter end deburring tool, including a tail handle 1, an outer shell 2, a first spring 3, a second spring 4, an outer cutter head 5, an inner cutter head 6 and a pin 7, wherein the tail handle 1 is fixedly mounted on one end of the outer shell 2, and one end of the tail handle is used to be connected to an adjustable speed electric drill, and the other end of the tail handle is located in a cavity at one end of the outer shell 2; the first spring 3 and the second spring 4 are overlapped on the rod body at the other end of the tail handle from the inside to the outside, and are respectively used to provide pre-pressure to the inner cutter head 6 and the outer cutter head 5 during non-working period, so that the inner cutter head and the outer cutter head are fixed at corresponding positions in the outer shell, and are respectively used to provide thrust to the inner cutter head and the outer cutter head during working period, so that the inner cutter head and the outer cutter head respectively contact the inner and outer burrs of the end of the aircraft catheter 8, and a consistent chamfer can be formed after the burrs are removed. The inner blade head 6 and the outer blade head 5 are sequentially mounted in the cavity at the other end of the outer shell 2 from the inside to the outside, and the outer blade head can slide axially along the outer shell cavity; the outer shell 2, the outer blade head 5 and the inner blade head 6 are radially connected by a pin 7, so that the outer shell 2, the outer blade head 5 and the inner blade head 6 can rotate synchronously driven by the tail handle, and long holes are provided on the side walls of the outer shell 2 and the outer blade head 5, so that the pin 7 can fix the outer shell and the outer blade head while driving the inner blade head to slide axially along the inner cavity of the outer blade head. The outer blade head 5 and the inner blade head 6 are provided with a coaxial outwardly expanding tapered hole and a tapered cone 603 at one end away from the first spring and the second spring, respectively. The cone 603 is located in the tapered hole, and a circle of outer blade teeth and inner blade teeth are processed on the inner circumference of the tapered hole and the outer circumference of the cone, respectively, for removing the outer burr and the inner burr of the catheter end, respectively. When in use, the inner cutter head and the outer cutter head contact the inner burr and the outer burr of the catheter end respectively under the thrust of the first spring and the second spring, and the burrs of the catheter end are removed simultaneously under the action of the torque of the adjustable speed electric drill, and a uniform chamfer is formed after the burrs are removed.

[0050] Reference Figure 3The tail handle 1 is designed and manufactured according to the size of the clamping end of the adjustable speed electric drill used, and is used to connect with the clamping end of the adjustable speed electric drill when in use. The adjustable speed electric drill provides driving force for the catheter end deburring tool. In actual use, the speed and torque of the adjustable speed electric drill can be adjusted according to the influence of the catheter material and diameter on the deburring effect to improve the deburring effect. For ease of operation, a handheld adjustable speed electric drill is used in the present invention.

[0051] The tail handle 1 is a multi-stage columnar structure, including a first cylinder 101, an end cover 102, a stud 103 and a second cylinder 104 which are coaxially connected in sequence. The first cylinder 101 is used to cooperate with the clamping end of the adjustable speed electric drill. The end face of the end cover 102 is in contact with the end face of the housing 2. The stud 103 and the second cylinder 104 are located in the cavity of the housing 2, and the external thread of the stud 103 is in contact with the internal thread of the housing 2; the second cylinder 104 is used to install the first spring 3.

[0052] Reference Figure 4 The shell 2 is in the shape of a rotating body, and a stepped central through hole is provided along the axis to provide installation space for the tail handle 1, the spring 3, the outer cutter head 5 and the inner cutter head. An inner thread is provided on the inner wall of one end of the stepped central through hole of the shell 2, which is used to cooperate with the stud thread of the tail handle 1, and the other end of the stepped central through hole is used to install the outer cutter head 5. The outer step surface of the outer cutter head 5 can fit with the inner step surface of the shell 2, and the outer cutter head can slide in the shell along the axial direction of the shell 2. A first strip hole is opened on the side wall of the shell 2 near the installation position of the outer cutter head and the inner cutter head, for the pin 7 to pass through. The shell 2, the outer cutter head 5 and the inner cutter head 6 are connected radially in sequence by the pin 7, so as to transmit the torque of the tail handle to the outer cutter head and the inner cutter head, so that the inner cutter head and the outer cutter head rotate synchronously with the shell. The length of the first strip hole is determined according to the set spring compression amount, and the width of the first strip hole is slightly larger than the outer diameter of the pin 7 to ensure that the pin rod section can pass through the first strip hole smoothly.

[0053] Reference Figure 5, the outer cutter head 5 is installed at the other end of the stepped central through hole of the outer shell 2, and is used to remove the outer circumferential burrs of the end of the catheter. The outer cutter head 5 is a rotary structure, and a multi-step through hole is provided in the middle along the axis, including a first column hole, a second column hole and a tapered hole that are coaxially connected in sequence, and the inner diameter of the first column hole is larger than the inner diameter of the second column hole, and the inner diameter of the second column hole is 0.02-0.05 mm larger than the middle diameter of the catheter. The first column hole is used to cooperate with the large end of the inner cutter head 6 when installing the inner cutter head 6. A number of first teeth are evenly arranged around the circumference on the inner wall of the tapered hole, and the angle between the first teeth and the generatrix of the tapered hole is 30°. Since the direction of the burrs formed on the aircraft catheter after the end face is flattened is basically perpendicular to the inner and outer surfaces of the catheter, the cutting surface of the outer cutter head 5 should also be as perpendicular to the burr direction as possible to directly act on the burrs. Based on the above analysis, in this embodiment, the taper of the tapered hole is 60°. Combined with the pressure provided by the spring, only a small chamfer is formed on the catheter body after deburring, which has no effect on the subsequent bell mouth expansion. This angle design is based on experimental data. At this angle, the burr removal efficiency is high and the damage to the tube body is minimal. A second strip hole is provided on the side wall of the outer cutter head 5 near the first column hole for the pin 7 to pass through. The length of the second strip hole is determined according to the set spring compression amount (the inner cutter head limit movement stroke). The width of the second strip hole is slightly larger than the outer diameter of the pin body, which facilitates the pin rod section to pass through the second strip hole smoothly; the width of the first strip hole on the outer shell 2 is equal to the width of the second strip hole.

[0054] Reference Figure 6 The first spring 3 is sleeved on the second cylinder 104 of the tail handle 1, and the two ends of the first spring 3 are limited between the stud end face of the tail handle 1 and the large end face of the inner cutter head 6; the diameter of the first spring 3 is larger than the aperture of the blind hole on the inner cutter head 6 and smaller than the large end diameter of the inner cutter head. The second spring 4 is coaxially stacked on the second cylinder 104 of the tail handle 1, and the two ends of the second spring 4 are limited between the stud end face of the tail handle 1 and the large end face of the outer cutter head 5; the diameter of the second spring 4 is larger than the large end diameter of the inner cutter head 6 and smaller than the inner diameter of the housing 2.

[0055] The initial state of the first spring 3 and the second spring 4 is a stretched state, and they can provide pre-pressure to the inner cutter head 6 and the outer cutter head 5 respectively during non-working period, so that the inner cutter head 6 and the outer cutter head 5 are maintained at corresponding positions in the shell, that is, the outer step surface of the large end of the outer cutter head fits with the inner step surface of the shell 2, and the outer step surface of the large end of the inner cutter head fits with the inner step surface of the outer cutter head 5; and they can provide the same elastic force to the inner cutter head 6 and the outer cutter head 5 respectively during working period, so that the contact force of the inner cutter head and the outer cutter head respectively contacting the inner circle and the outer circle of the end of the aircraft catheter 8 is the same, and a consistent chamfer can be formed after removing the burrs.

[0056] Reference Figure 7The inner cutter head 6 is embedded in the multi-step through hole of the outer cutter head 5 with clearance fit, and the inner cutter head 6 is used to remove burrs on the inner circle of the end face of the catheter. The inner cutter head 6 is multi-step, including a first cylinder 601, a second cylinder 602 and a cone 603 that tapers outwards and is coaxially connected in sequence. The diameter of the first cylinder 601 is greater than the diameter of the second cylinder. The taper of the cone 603 is 60 degrees. A number of second cutter teeth are evenly arranged around the circumference of the outer wall of the cone, and the angle between the second cutter teeth and the generatrix of the cone is 30 degrees. The first column 601 cooperates with the first column hole of the outer cutter head 5, and the outer step surface of the inner cutter head 6 can fit with the inner step surface of the outer cutter head 5 to play a limiting role; the cone is located in the tapered hole of the outer cutter head, and when the inner cutter head 6 is flush with the two ends of the outer cutter head 5, the cone of the inner cutter head is located in the tapered hole of the outer cutter head, and the distance between the large end of the cone of the inner cutter head and the small end of the tapered hole of the outer cutter head is not more than 0.5 mm, which is designed to be 0.5 mm in this embodiment. This design is used for centering and alignment of the deburring tool, that is, when the tool is working, the inner cutter head first contacts the inner end surface of the catheter, and after fitting, the inner cutter head slides axially by 0.5 mm toward one end of the spring under the action of external thrust, and then the outer cutter contacts the outer end surface of the catheter.

[0057] The inner cutter head 6 has a blind hole formed along the axis by the end face of the first cylinder 601, which is used to cooperate with the second cylinder 104 of the tail handle 1. The depth of the blind hole is determined according to the set spring compression amount, and the blind hole is used to make way for the second cylinder of the tail handle when the inner cutter head 6 moves axially. The nominal diameters of the inner cutter head and the outer cutter head are the same and equal to the middle diameter of the aircraft catheter, and the two cutter heads are clearance-fitted, and the clearance is 0.02 mm-0.05 mm, that is, the outer diameter of the inner cutter head 6 is 0.02 mm-0.05 mm smaller than the middle diameter of the catheter. A pin mounting hole is provided radially on the second cylinder 602 of the inner cutter head 6, and the pin 7 mounting hole includes a coaxially connected column hole and a screw hole, which are used to fix the mounting pin 7.

[0058] Due to the existence of tool manufacturing errors and pipe raw material errors, the inner and outer burrs of the catheter end face are not removed at the same time during deburring, resulting in inconsistent chamfer sizes of the inner and outer chamfers of the catheter end face after deburring, or even one of the chamfers is too large, which exceeds the process requirements. In order to avoid the above problems, the inner and outer cutter heads of the present invention are designed to slide against each other. The inner and outer cutter heads contact the inner and outer edges of the catheter end face under the thrust of the first spring and the second spring, respectively, and remove burrs at the same time. After removing the burrs, the inner and outer circles form uniform chamfers.

[0059] Reference Figure 8The pin 7 includes a coaxially connected threaded section and a cylindrical end. The threaded section of the pin passes through the first elongated hole on the outer shell 2, the second elongated hole on the outer cutter head 5, and the pin mounting hole on the inner cutter head 6 in sequence. The threaded section of the pin is threadedly connected with the screw hole of the pin mounting hole on the inner cutter head. The pin 7 can slide axially along the first elongated hole on the outer shell 2 and the second elongated hole on the outer cutter head 5, while transmitting the torque of the adjustable speed electric drill to the outer cutter head and the inner cutter head through the tail handle 1 and the outer shell 2, so that the outer cutter head 5 and the inner cutter head 6 rotate together with the outer shell and the tail handle.

[0060] According to the use frequency of the deburring tool and the tube material of the catheter, and considering the strength and toughness of the deburring tool, the material of the inner and outer cutter heads in this embodiment is DC53.

[0061] Reference Fig. 9 , is a schematic diagram of the cooperation between the aircraft duct 8 and the tool of the present invention. The process of removing burrs using the tool of the present invention is as follows:

[0062] 1. Fix the aircraft guide tube 8 on the bench vise through a clamp.

[0063] 2. Install the tail handle 1 on the adjustable speed electric drill and set the speed of the adjustable speed electric drill.

[0064] 3. Driven by an adjustable speed electric drill, push the end of the tool of the present invention into the end of the aircraft catheter 8 to be deburred along the axial direction of the aircraft catheter 8. The inner cutter head first contacts the inner circle of the catheter end face, and continuously applies a driving force. After the inner cutter head moves about 0.5mm in the axial direction toward the adjustable speed electric drill, the outer cutter head contacts the outer circle of the aircraft catheter end face. The free sliding amount of 0.5mm between the inner and outer cutter heads can make the inner and outer cutter heads evenly fit on the inner and outer circles of the catheter end face, ensuring the quality of the catheter end face after deburring.

[0065] 4. Start the adjustable speed electric drill, the tail handle and the outer shell 2 rotate, thereby driving the inner and outer cutter heads to rotate synchronously, and at the same time remove the inner and outer burrs of the catheter end face.

[0066] 5. Perform multiple visual inspections until the burrs on the inner and outer circles are completely removed, and the work is completed.

[0067] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be included in the protection scope of the present invention.

Claims

1. A catheter end deburring tool, characterized in that: It includes a tail handle, a housing, a first spring, a second spring, an outer cutter head, an inner cutter head and a pin; The tail handle is coaxially fixedly mounted at one end of the housing, and one end of the tail handle is used to connect to an external adjustable speed electric drill, and the other end of the tail handle is located in a cavity at one end of the housing; The inner cutter head and the outer cutter head are sequentially inserted into the cavity at the other end of the outer shell from the inside to the outside, the outer cutter head can slide axially along the cavity of the outer shell, and the inner cutter head can slide axially along the inner cavity of the outer cutter head; The side wall of the shell and the side wall of the outer cutter head are respectively provided with a first long hole and a second long hole in the axial direction, and the side wall of the inner cutter head is provided with a pin mounting hole, and the pin passes through the first long hole, the second long hole and the pin mounting hole in sequence, and the shell, the outer cutter head and the inner cutter head are radially connected, so that the shell, the outer cutter head and the inner cutter head can rotate synchronously under the drive of an external adjustable speed electric drill, and the pin can slide along the first long hole and the second long hole; The outer cutter head and the inner cutter head are provided with a coaxial tapered hole and a tapered cone that expand outwards and contract gradually at one end away from the first spring and the second spring, respectively. The cone is located in the tapered hole, and a circle of outer cutter teeth and inner cutter teeth are processed on the inner circumference of the tapered hole and the outer circumference of the cone, respectively. The outer cutter teeth and the inner cutter teeth are used to contact the outer burr and the inner burr of the catheter end, respectively. The first spring and the second spring are overlapped on the other end of the tail handle from the inside to the outside. In the initial state, the first spring and the second spring are in a stretched state, and are used to provide pre-pressure to the inner cutter head and the outer cutter head respectively during non-working period, so that the inner cutter head and the outer cutter head are fixed in corresponding positions of the shell; the first spring and the second spring are also used to provide thrust to the inner cutter head and the outer cutter head respectively during working period, so that the outer cutter teeth and the inner cutter teeth can remove the outer circle burrs and the inner circle burrs of the catheter end at the same time, and the outer circle and the inner circle have the same size after the burrs are removed.

2. A catheter end deburring tool according to claim 1, characterized in that: The outer burr and the inner burr on the end of the catheter are respectively perpendicular to the outer circumferential surface and the inner circumferential surface of the catheter; The taper of the tapered hole on the outer cutter head and the taper of the cone on the inner cutter head are both 60°.

3. A catheter end deburring tool according to claim 2, characterized in that: The included angle between the inner cutter teeth and the generatrix of the tapered hole is 30°; the included angle between the outer cutter teeth and the generatrix of the cone is 30°.

4. A catheter end deburring tool according to claim 3, characterized in that: When the two end surfaces of the outer cutter head and the inner cutter head are flush with each other, the large end of the cone is located in the tapered hole, and the distance from the large end of the cone to the small end of the tapered hole is 0-5mm.

5. The catheter end deburring tool according to claim 1, characterized in that: The shell is in a rotary shape, and its cavity is a central through hole opened along the axis. An inner thread is provided on the inner wall of one end of the central through hole, and the other end of the central through hole is a stepped hole for mounting the outer cutter head; The first elongated hole is arranged on the side wall of the shell near the installation positions of the outer blade head and the inner blade head.

6. A catheter end deburring tool according to claim 5, characterized in that: The tail handle comprises a first cylinder, an end cover, a stud and a second cylinder which are coaxially connected in sequence; the first cylinder is used to be connected to the clamping end of the adjustable speed electric drill; The stud and the second cylinder are located at one end of the central through hole of the shell, and the stud is connected with the internal thread of the inner wall of the shell, and the end cover is fitted with the end surface of one end of the shell; The first spring and the second spring are stacked on the second cylinder, the two ends of the first spring are limited between the end face of the stud and the large end face of the inner cutter head, and the two ends of the second spring are limited between the end face of the stud and the large end face of the outer cutter head.

7. A catheter end deburring tool according to claim 6, characterized in that: The inner cavity of the outer cutter head comprises a second column hole and a first column hole which are coaxially connected to the tapered hole in sequence, and the inner diameter of the first column hole is larger than the inner diameter of the second inner hole; The second elongated hole is formed on the side wall of the outer blade head at a position close to the first column hole.

8. A catheter end deburring tool according to claim 7, characterized in that: The inner cutter head comprises a second cylinder and a first cylinder which are coaxially connected to the cone in sequence, and the outer diameter of the first cylinder is greater than the outer diameter of the second cylinder; The first column matches the first column hole of the outer cutter head; A blind hole is provided on the inner cutter head along the axis from the end surface of the first cylinder, and the depth of the blind hole is determined according to the set spring compression amount; the blind hole is used to make way for the second cylinder of the tail handle when the inner cutter head moves along the axial direction; The pin installation hole is arranged on the side wall of the second column, and comprises a coaxially connected cylindrical hole and a screw hole.

9. The catheter end deburring tool according to claim 1, characterized in that: The material of the inner cutter head and the outer cutter head is DC53.

10. A deburring method using a catheter end deburring tool according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1, fix the catheter on a bench vise, with the end to be deburred facing the deburring tool; Step 2, install the tail handle on the clamping end of the adjustable speed electric drill, and set the speed of the adjustable speed electric drill; Step 3: Under the drive of an adjustable speed electric drill, push one end of the deburring tool with the outer cutter head and the inner cutter head installed into the catheter along the axial direction of the catheter until the outer circle and the inner circle of the catheter end face respectively collide with the outer cutter head and the inner cutter head; Step 4, start the adjustable speed electric drill, rotate the tail handle and the outer shell, drive the inner cutter head and the outer cutter head to rotate synchronously, and remove the inner burr and the outer burr of the catheter end at the same time; Step 5, visually inspect the catheter several times until the inner and outer burrs of the catheter end are completely removed.

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