Gun barrel connecting structure and mounting method

Abstract

According to the gun barrel connecting structure and the mounting method, a gun barrel can be repeatedly disassembled and assembled, and the repeated mounting and positioning precision is high. Comprising a cartridge receiver, a gun barrel is positioned and connected to the cartridge receiver through a threaded hole, the threaded hole is provided with a rectangular notch, the rectangular notch is tensioned through a screw rod, one end of the screw rod is provided with a flat ball head, one side of a through hole is provided with a semicircular arc surface, the flat ball head is provided with a step, an eccentric handle is hinged to the flat ball head, and a clamping tenon is hinged to the interior of the eccentric handle. The mortise and tenon is provided with a pulling arm and a clamping arm, a first compression spring is arranged between the pulling arm and the eccentric handle, in a normal state, the clamping arm is matched with the step of the flat ball head under the action of the first compression spring, and the mortise and tenon limits the eccentric handle.

Description

Technical Field

[0001] The present invention relates to the technical field of firearms, and in particular to a gun barrel connection structure and an installation method. Background Art

[0002] The connection between the barrel and the receiver or the adapter of modern firearms can be divided into fixed and detachable types. The detachable type is mostly used in machine guns. Its function is to replace the backup barrel after the barrel overheats due to continuous shooting of the firearm, and only shooting is required. Some sniper rifles also have detachable barrels. Its main function is to replace barrels of different calibers and corresponding parts such as bolts and magazines to fire bullets of different calibers, so as to realize the modular design of sniper rifles of different calibers. After replacing the barrel, due to the large installation accuracy error, live ammunition shooting is often required to re-zero the gun scope. Due to site restrictions, the operation is cumbersome and it is difficult to achieve rapid combat conversion. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a gun barrel connection structure and an installation method, which can repeatedly disassemble and assemble the gun barrel and has high positioning accuracy for repeated installation.

[0004] The object of the present invention is achieved in that:

[0005] A gun barrel connection structure comprises a casing (1), wherein the casing (1) is provided with a positioning installation hole and a positioning end face of a gun barrel (2), wherein the gun barrel (2) is positioned and connected to the casing (1) through the positioning installation hole, wherein the positioning installation hole comprises a threaded hole (102), wherein a rectangular notch (104) is provided above the threaded hole (102), wherein a transverse through hole (105) is provided at the top of the rectangular notch (104), and wherein the screw rod (3) comprises a smooth rod portion, wherein the smooth rod portion of the screw rod (3) is loosely fitted in the through hole (105), wherein one end of the screw rod (3) is screwed in place through a threaded hole (102). The female (5) is locked, and the other end is provided with an oblate ball head (302) for axial positioning, the through hole (105) is provided with a semicircular arc surface (106) on one side corresponding to the oblate ball head (302), the two ends of the oblate ball head (302) are planes (304), and the outer arc of the oblate ball head (302) is provided with a step (303), and cylindrical pins (7) are fixed on the planes (304) at both ends of the oblate ball head (302) in a vertical direction, and an eccentric handle (4) is hinged on the cylindrical pin (7), and one end of the eccentric handle (4) is a cylinder (401), and the cylinder (401) is laterally provided with a notch (4 02), the notch (402) is sleeved on both sides of the plane (304) of the mounting screw (3); the cylinder (401) is axially provided with an eccentric through hole (403), the eccentric through hole (403) is sleeved on the cylindrical pin (7) to form a hinge, the eccentric handle (4) is provided with a groove (404) adjacent to the notch (402), a tenon (6) is hinged in the groove (404), the tenon (6) is L-shaped, the tenon (6) has a pull arm and a clamping arm, a first compression spring (9) is provided between the pull arm and the eccentric handle (4), and under normal conditions, the clamping arm is in the first Under the action of the compression spring (9), the step (303) of the flat ball head (302) is matched with the tenon (6), and the tenon (6) forms a limit for the eccentric handle (4). When the lever arm of the tenon (6) is pressed, the clamping arm of the tenon (6) is separated from the step (303) of the flat ball head (302), and the eccentric handle (4) can be rotated. Since the hinge point of the eccentric handle (4) deviates from the center of the circle, when the eccentric handle (4) rotates, the different positions of the cylinder (401) on the eccentric handle (4) cooperate with the semicircular arc surface (106), thereby changing the width of the threaded hole (102), thereby realizing locking / unlocking of the gun barrel;

[0006] The gun barrel (2) is provided with a positioning hoop (10) and a handle (11) adjacent to each other. The positioning hoop (10) is fixedly connected. One end of the handle (11) is provided with a through hole (1101). The through hole (1101) is clearance-matched with the gun barrel (2). The handle (11) and the gun barrel (2) can generate relative rotation. The outer circumferential surface (1004) of the positioning hoop (10) is evenly distributed with a plurality of through holes (1005). The handle (11) is provided with a T-shaped guide rail (1102) perpendicular to the axial direction of the through hole (1101). A lock buckle (13) is slidably matched in the guide rail (1102). An operating handle (1103) is provided parallel to the through hole (1101) of the handle (11). A blind hole (1104) is provided at the upper end of the guide rail (1102). The upper end of the second compression spring (14) is installed in the blind hole (1104) above the guide rail (1102); the lower end head of the lock buckle (13) is designed with a positioning cylindrical surface (1301); the diameter of the positioning cylindrical surface (1301) is smaller than the diameter of the through hole (1005); the lock buckle (13) is provided with a blind hole (1302) parallel to the positioning cylindrical surface (1301), and the lower end of the second compression spring (14) is installed in the blind hole (1302) on the lock buckle (13); under the action of the second compression spring (14), the positioning cylindrical surface (1301) is inserted into a through hole (1005), so that the handle (11) is fixedly connected with the positioning hoop (10) to lock the circumferential position of the handle (11); an operating handle (1303) is provided above the lock buckle (13).

[0007] Preferably, the positioning and mounting hole provided on the casing (1) comprises three stepped holes, wherein the first stepped hole is the first light hole (101), the second stepped hole is the threaded hole (102), and the third stepped hole is the second light hole (103); the diameter of the first light hole (101) is larger than the major diameter of the threaded hole, and the major diameter of the threaded hole is larger than the second light hole (103); a back-off groove is provided at the intersection of each stepped hole; the length of the rectangular notch (104) is larger than the length of the threaded hole (102), and does not penetrate the first light hole (101) and the second light hole (103); the end face of the casing (1) is provided as a positioning end face (107) perpendicular to the second light hole (103);

[0008] The gun barrel (2) is provided with four cylindrical surfaces, the first cylindrical surface is the optical axis (201), the second cylindrical surface is the right-handed single-line thread (202), the third cylindrical surface is the optical axis (203), and the fourth cylindrical surface is the optical axis (204); the diameter of the optical axis (204) is greater than the outer diameter of the optical axis (203), the diameter of the optical axis (203) is greater than the outer diameter of the thread (202), and the outer diameter of the thread (202) is greater than the diameter of the optical axis (201); a shaft shoulder (205) is provided in front of the optical axis (204), and an external hexagon (206) is provided in front of the shaft shoulder (205); the positioning hoop (10) and the handle (11) are sleeved on the optical axis (204), and a knife retreat groove is provided at the intersection of each cylindrical surface.

[0009] Preferably, the positioning hoop (10) and the gun barrel (2) are in interference fit, and a cylindrical cross pin (12) is provided to pass through the positioning hoop (10) and the gun barrel (2) to fix the positioning hoop (10) and the gun barrel (2), and the cross pin (12) and the positioning hoop (10) and the gun barrel (2) are all in interference fit.

[0010] Preferably, an axial gap is left between the positioning hoop (10) and the handle (11) to ensure that the handle (11) and the gun barrel (2) can rotate relative to each other.

[0011] Preferably, a boss (1003) is provided on one end surface (1002) of the positioning hoop (10), and a limiting surface (108) is provided on the casing (1) in the longitudinal direction, and the boss (1003) is used to be inserted into the limiting surface (108) for limiting.

[0012] A method for installing a gun barrel connection structure,

[0013] S1. Install the handle (11)

[0014] Install the spring (14) into the blind hole (1102) of the handle (11), install the lock (13) into the guide rail (1102) of the handle (11); lift the lock (13), and then put the handle (11) onto the optical axis (204) of the barrel (2); and make the handle (11) contact the shoulder (205) of the barrel (2);

[0015] S2, Pre-installed positioning hoop (1)

[0016] Press the latch (6) to release the eccentric handle (4); sleeve the positioning hoop (10) onto the optical axis (203) of the gun barrel (2); lift the lock buckle (13) so that the positioning cylindrical surface (1301) of the lock buckle (13) is higher than the outer cylindrical surface (1004) of the positioning hoop (10); and then sleeve the positioning hoop (10) onto the optical axis (204) of the gun barrel (2);

[0017] S3. Install the barrel (2)

[0018] Insert the gun barrel (2) with the positioning hoop (10) pre-installed into the receiver (1); rotate the gun barrel (2) clockwise to screw the thread (202) on the gun barrel (2) into the threaded hole (102) on the receiver (1); adjust the installation angle of the positioning hoop (10) to make the end face (1002) of the positioning hoop (10) contact the positioning end face (107) of the receiver (1);

[0019] S4. Adjust the position of the positioning hoop (10)

[0020] The wrench is clamped on the outer hexagon (206) of the gun barrel (2), and the gun barrel is twisted clockwise so that the boss (1003) of the positioning hoop (10) is inserted into the limiting surface (108) of the receiver (1); at the same time, the required dimension A between the gun barrel (2) and the receiver (1) is satisfied, and a gap is ensured between the positioning hoop (10) and the handle (11), so that the handle (11) and the gun barrel (2) can rotate relative to each other; after the position of the positioning hoop (10) is adjusted, lines are engraved on the positioning hoop (10) and the gun barrel (2), so that the two can accurately return to their original positions after rotation occurs again;

[0021] S5, fixed positioning hoop (10)

[0022] Lift the lock catch (13), clamp the outer hexagon (206) of the barrel (2) with a wrench, and loosen the barrel (2) counterclockwise; then continue to rotate the barrel (2) counterclockwise until the thread (202) of the barrel (2) is screwed out of the threaded hole (102) of the receiver (1), and then pull the barrel (2) forward; finally, drill a hole and install the cross pin (12); after the assembly is completed, a barrel assembly (15) is formed;

[0023] S6. Install the barrel assembly (15)

[0024] Operate the handle (11), lift the lock (13), and insert the barrel assembly (15) into the receiver (1); rotate the barrel (2) clockwise to screw the thread (202) of the barrel (2) into the threaded hole (102) of the receiver (1) until it is tightened; lower the lock (13), adjust the angle of the handle (11), and insert the positioning cylindrical surface (1301) of the head of the lock (13) into a through hole (1005) of the positioning hoop (10), and rotate the handle (11) clockwise to tighten the barrel again (15). 2), make the end face (1002) of the positioning hoop (10) contact with the positioning end face (107) of the casing (1), and at the same time, the boss (1003) on the positioning hoop (10) is inserted into the limiting surface (108) of the casing (1) for positioning; rotate the locking eccentric handle (4) to reduce the diameter of the threaded hole (102), and make the clamping arm of the tenon (6) contact with the step (303) of the screw rod (3); use a wrench to adjust the installation angle of the nut (5) and adjust the locking torque of the eccentric handle (4) to the correct position;

[0025] Preferably, the method for disassembling the barrel assembly (15) is:

[0026] Press the latch (6) to release the eccentric handle (4); lower the lock buckle (13), adjust the angle of the handle (11) so that the positioning cylindrical surface (1301) of the head of the lock buckle (13) is inserted into a through hole (1005) of the positioning hoop (10), and rotate the handle (11) counterclockwise to loosen the barrel assembly (15); then lift the lock buckle (13) and continue to rotate the barrel (2) counterclockwise by hand until the thread (202) of the barrel (2) is screwed out of the threaded hole (102) of the receiver (1), and then pull the barrel assembly (15) forward.

[0027] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0028] The barrel can be repeatedly installed with high positioning accuracy.

[0029] There is no need to design and process the thread with a fixed starting point, which reduces the manufacturing difficulty.

[0030] After the barrel is installed, the receiver can be pressed by the eccentric handle to reduce the diameter of the threaded hole and make the barrel installed securely. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention is further described below in conjunction with the accompanying drawings.

[0032] Figure 1 It is a schematic diagram of the structure after the present invention is installed;

[0033] 1-receiver; 2-barrel; 3-screw; 4-eccentric handle; 5-nut; 6-tenon; 7-large cylindrical pin; 8-small cylindrical pin; 9-short cylindrical compression spring; 10-positioning hoop; 11-handle; 12-cross pin; 13-lock; 14-long cylindrical compression spring;

[0034] Figure 2 It is a schematic diagram of the structure after the present invention is disassembled;

[0035] 15-Barrel assembly;

[0036] Figure 3 It is a structural schematic diagram of the casing of the present invention;

[0037] 101-bright hole; 102-threaded hole; 103-bright hole; 104-notch; 105-through hole; 106-semicircular arc surface; 107-end surface; 108-limiting surface;

[0038] Figure 4 It is a structural schematic diagram of the gun barrel of the present invention;

[0039] 201-optical axis; 202-thread; 203-optical axis; 204-optical axis; 205-shaft shoulder; 206-external hexagon;

[0040] Figure 5 It is a structural schematic diagram of the screw of the present invention;

[0041] 301-thread; 302-flat ball head; 303-step; 304-plane; 305-through hole;

[0042] Figure 6 It is a structural schematic diagram of the eccentric handle of the present invention;

[0043] 401-cylinder; 402-notch; 403-eccentric through hole; 404-slot; 405-through hole;

[0044] Figure 7 It is a structural schematic diagram of the tenon of the present invention;

[0045] 601-through hole;

[0046] Figure 8 It is a structural schematic diagram of the positioning hoop of the present invention;

[0047] 1001-through hole; 1002-end surface; 1003-boss; 1004-outer cylindrical surface; 1005-through hole;

[0048] Fig. 9 It is a structural schematic diagram of the handle of the present invention;

[0049] 1101-through hole; 1102-guide rail; 1103-cylindrical surface; 1104-blind hole;

[0050] Fig.10 It is a schematic diagram of the structure of the lock buckle of the present invention;

[0051] 1301- cylindrical surface; 1302- blind hole; 1303- operating handle. DETAILED DESCRIPTION

[0052] The present invention relates to a barrel connection structure and assembly method that can be repeatedly disassembled and assembled. Three step holes are arranged in front of a receiver 1 for installing a barrel 2. The first step hole is arranged as a first light hole 101, the second step hole is arranged as a right-handed single-line threaded hole 102, and the third step hole is arranged as a second light hole 103. The diameter of the first step hole is larger than the major diameter of the threaded hole, and the major diameter of the threaded hole is larger than the diameter of the third step hole. A tool withdrawal groove is arranged at the intersection of each step hole. A rectangular notch 104 is arranged above the threaded hole. The length of the rectangular notch 104 is larger than the length of the threaded hole 102, and does not penetrate the first light hole 101 and the second light hole 103. A through hole 105 is arranged at the top of the rectangular notch 104 for installing a screw rod 3, and a semicircular arc surface 106 is arranged on one side of the through hole 105 for installing an eccentric handle 4. The front of the receiver 1 is arranged as an end face 107 perpendicular to the second light hole 103.

[0053] The rear end of the gun barrel 2 is provided with four cylindrical surfaces, the first cylindrical surface is the optical axis 201, the second cylindrical surface is the right-handed single-thread 202, the third cylindrical surface is the optical axis 203, and the fourth cylindrical surface is the optical axis 204. The diameter of the optical axis 204 is larger than the outer diameter of the optical axis 203, the diameter of the optical axis 203 is larger than the outer diameter of the thread 202, and the outer diameter of the thread 202 is larger than the diameter of the optical axis 201. A shoulder 205 is provided in front of the optical axis 204, and an external hexagon 206 is provided in front of the shoulder 205. A back cut is provided at the intersection of each cylindrical surface.

[0054] One end of the screw rod 3 is provided with a thread 301 for mounting a nut 5, and the other end is provided with a flat ball head 302. The arc portion of the flat ball head 302 is provided with a step 303 to abut against the mounting tenon 6. Symmetrical planes 304 are provided on both sides of the flat ball head 302, and a through hole 305 is provided in the center of the plane. The through hole 305 is sleeved with a cylindrical pin 7, and is designed to be interference fit to fix the mounting screw rod 3 and the cylindrical pin 7.

[0055] The head of the eccentric handle 4 is set as a cylinder 401, and the cylinder 401 is transversely provided with a notch 402, and the notch 402 is sleeved on both sides of the plane 304 of the mounting screw 3. The cylinder 401 is axially provided with an eccentric through hole 403, and the through hole 403 is sleeved with a large cylindrical pin 7, and is designed to be a clearance fit so that the eccentric handle 4 and the large cylindrical pin 7 can produce relative rotation. The eccentric handle 4 is provided with a groove 404 sleeved with a mounting tenon 6. The eccentric handle 4 is provided with a through hole 405 to install a small cylindrical pin 8, and is designed to be an interference fit to fix the eccentric handle 4 and the small cylindrical pin 8.

[0056] The nut 5 is provided as a standard part.

[0057] The tenon 6 is configured to be L-shaped, and a through hole 601 is provided at the corner to install the small cylindrical pin 8, and is designed to be a clearance fit so that the tenon 6 and the small cylindrical pin 8 can produce relative rotation.

[0058] A short cylindrical compression spring 9 is provided between the eccentric handle 4 and the tenon 6 so as to push the head of the tenon 6 against the step 303 of the screw rod 3 to prevent relative rotation between the eccentric handle 4 and the screw rod 3.

[0059] The optical axis 204 of the gun barrel 2 is sleeved with a positioning hoop 10 and a handle 11. The positioning hoop 10 and the gun barrel 2 are designed to be interference fit, and a cylindrical cross pin 12 is provided to pass through the positioning hoop 10 and the gun barrel 2 at the same time to fix the positioning hoop 10 and the gun barrel 2. The cross pin 12 is interference fit with the positioning hoop 10 and the gun barrel 2. The handle 11 and the gun barrel 2 are designed to be clearance fit so that the handle 11 and the gun barrel 2 can generate relative rotation.

[0060] The positioning hoop 10 is provided with a through hole 1001, a vertical end face 1002 is provided on the left side of the through hole 1001, and a boss 1003 is provided on the end face 1002. The height H of the boss 1003 is set to 0.6 to 0.8 times the pitch of the thread 22 of the barrel 2. The outer circumferential surface 1004 of the positioning hoop 10 is evenly provided with 8 through holes 1005.

[0061] The handle 11 is provided with a through hole 1101. A T-shaped guide rail 1102 is provided perpendicular to the axis direction of the through hole 1101 to install the lock buckle 13, and an operating handle 1103 is provided parallel to the axis direction of the through hole 1101. A blind hole 1104 is provided above the guide rail 1102 to install the long cylindrical compression spring 14.

[0062] The head of the lock buckle 13 is designed as a positioning cylindrical surface 1301. A blind hole 1302 is arranged parallel to the positioning cylindrical surface 1301 to install the long cylindrical compression spring 14. The diameter of the positioning cylindrical surface 1301 is smaller than the diameter of the through hole 1005. An operating handle 1303 is arranged above the lock buckle 13 and is perpendicular to the axis of the positioning cylindrical surface 1301.

[0063] Installation method:

[0064] S1. Install the handle 11

[0065] Install the spring 14 into the blind hole 1102 of the handle 11, and install the lock buckle 13 into the guide rail 1102 of the handle 11. Lift the lock buckle 13, so that the positioning cylindrical surface 1301 of the lock buckle 13 is higher than the diameter of the through hole 1101 of the handle 11. Then, the handle 11 is sleeved and installed on the optical axis 204 of the barrel 2. And the handle 11 is made to contact the shaft shoulder 205 of the barrel 2.

[0066] S2, pre-installed positioning hoop 10

[0067] Press the latch 6 to release the eccentric handle 4. Install the positioning hoop 10 on the optical axis 203 of the barrel 2. Lift the lock buckle 13 so that the positioning cylindrical surface 1301 of the lock buckle 13 is higher than the outer cylindrical surface 1004 of the positioning hoop 10. Install the positioning hoop 10 on the optical axis 204 of the barrel 2, and leave an axial gap of 1.0 to 1.2 times the pitch of the barrel 2 thread 202 between the positioning hoop 10 and the handle 11 to ensure that the handle 11 and the barrel 2 can rotate relative to each other.

[0068] S3. Install the barrel 2

[0069] Insert the gun barrel 2 with the pre-installed positioning hoop 10 into the receiver 1. Rotate the gun barrel 2 clockwise to screw the thread 202 of the gun barrel 2 into the threaded hole 102 of the receiver 1, and properly adjust the installation angle of the positioning hoop 10 to make the end face 1002 of the positioning hoop 10 contact the end face 107 of the receiver 1.

[0070] S4. Adjust the position of the positioning hoop 10

[0071] Put the wrench on the outer hexagon 206 of the barrel 2, and use a torque of 30N·m to 40N·m to turn the barrel clockwise, so that the side 1005 of the boss 1003 of the positioning hoop 10 contacts the limit surface 108 of the receiver 1; at the same time, the dimension A between the barrel 2 and the receiver 1 is met, and a gap is ensured between the positioning hoop 10 and the handle 11 so that the handle 11 and the barrel 2 can rotate relative to each other. After adjusting the position of the positioning hoop 10, mark the positioning hoop 10 and the barrel 2 to prevent the two from rotating again and accurately restore the position.

[0072] S5, fixed positioning hoop 10

[0073] Lift the lock catch 13, clamp the outer hexagon 206 of the barrel 2 with a wrench, and loosen the barrel 2 counterclockwise. Then continue to rotate the barrel 2 counterclockwise by hand until the barrel 2 thread 202 is screwed out of the threaded hole 102 of the receiver 1, and then pull the barrel 2 forward. Finally, drill holes and install the cross pin 12. After assembly, a barrel assembly 15 is formed.

[0074] S6, install the barrel assembly 15

[0075] Operate the handle 11, lift the lock 13, and insert the barrel assembly 15 into the receiver 1. Rotate the barrel 2 clockwise by hand, so that the thread 202 of the barrel 2 is screwed into the threaded hole 102 of the receiver 1 until it is tightened. Put down the lock 13, adjust the angle of the handle 11, so that the head positioning cylindrical surface 1301 of the lock 13 is inserted into the through hole 1005 of the positioning hoop 10, rotate the handle 11 clockwise to tighten the barrel 2 again, so that the end face 1002 of the positioning hoop 10 contacts the end face 107 of the receiver 1, and at the same time, the side face 1004 of the boss 1003 of the positioning hoop 10 contacts the limit surface 108 of the receiver 1. Lock the eccentric handle 4, and make the head of the tenon 6 contact the step 303 of the screw rod 3. Use a wrench to adjust the installation angle of the nut 5 and set the locking torque of the locking eccentric handle 4 to 2N·m~3N·m.

[0076] S7, disassemble the barrel assembly 15

[0077] Press the latch 6 to release the eccentric handle 4. Put down the lock 13, adjust the angle of the handle 11, insert the positioning cylindrical surface 1301 of the lock 13 head into the through hole 1005 of the positioning hoop 10, and rotate the handle 11 counterclockwise to loosen the barrel assembly 15. Then lift the lock 13, continue to rotate the barrel 2 counterclockwise by hand until the barrel 2 thread 202 is screwed out of the threaded hole 102 of the receiver 1, and then pull out the barrel assembly 15 forward.

[0078] optimization:

[0079] Optimization 1: The length of the optical axis 201 of the barrel 2 is optimized to be twice the length of the threaded hole 102 of the receiver 1. After the optical axis 201 of the barrel 2 is inserted into the first optical hole 101 of the receiver 1, the barrel 2 can be guided to improve the convenience of operation when the barrel 2 is twisted to screw the thread 202 of the barrel 2 into the threaded hole 102 of the receiver 1.

[0080] Optimization 2: The eccentric distance L of the eccentric through hole 403 of the eccentric handle 4 is optimized to 0.3-0.6 mm.

[0081] Optimization three: The interference fit between the positioning hoop 10 and the gun barrel 2 is designed to be 0.001-0.003 mm, so that the positioning hoop 10 can rotate relative to the gun barrel 2 under a torque of 15 N·m-25 N·m.

[0082] The present invention aims at the defects in the prior art and has the following advantages:

[0083] Advantage 1: The repeated installation and positioning accuracy of the barrel 2 is high.

[0084] Advantage 2: There is no need to design and process the thread with a fixed starting point, which reduces the manufacturing difficulty.

[0085] Advantage three: After the barrel 2 is installed, the receiver 1 can be pressed by the eccentric handle 4 to reduce the diameter of the threaded hole 102, so that the barrel 2 can be installed securely.

[0086] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A gun barrel connection structure, characterized in that: The invention comprises a casing (1), wherein a positioning and mounting hole and a positioning end face of a gun barrel (2) are provided on the casing (1), and the gun barrel (2) is positioned and connected to the casing (1) through the positioning and mounting hole, wherein the positioning and mounting hole comprises a threaded hole (102), a rectangular notch (104) is provided above the threaded hole (102), and a transverse through hole (105) is provided at the top of the rectangular notch (104), and further comprises a screw rod (3), wherein the screw rod (3) comprises a smooth rod portion, and the smooth rod portion of the screw rod (3) is loosely fitted in the through hole (105), and one end of the screw rod (3) is locked by a nut (5). The other end is provided with an oblate ball head (302) for axial positioning, the through hole (105) is provided with a semicircular arc surface (106) on one side corresponding to the oblate ball head (302), the two ends of the oblate ball head (302) are planes (304), the outer arc of the oblate ball head (302) is provided with a step (303), cylindrical pins (7) are fixed in a vertical direction on the two end planes (304) of the oblate ball head (302), an eccentric handle (4) is hinged on the cylindrical pin (7), one end of the eccentric handle (4) is a cylinder (401), and the cylinder (401) is transversely provided with a notch (402), The notch (402) is sleeved on both sides of the plane (304) of the mounting screw rod (3); the cylinder (401) is axially provided with an eccentric through hole (403), the eccentric through hole (403) is sleeved on the cylindrical pin (7) to form a hinge, the portion of the eccentric handle (4) adjacent to the notch (402) is provided with a groove (404), a tenon (6) is hinged in the groove (404), the tenon (6) is L-shaped, the tenon (6) has a pull arm and a clamping arm, a first compression spring (9) is provided between the pull arm and the eccentric handle (4), and under normal conditions, the clamping arm is in the first compression spring. The spring (9) cooperates with the step (303) of the flat ball head (302) under the action of the spring (9), and the latch (6) forms a limit for the eccentric handle (4). When the lever arm of the latch (6) is pressed, the latch arm of the latch (6) is separated from the step (303) of the flat ball head (302), and the eccentric handle (4) can rotate. Since the hinge point of the eccentric handle (4) deviates from the center of the circle, when the eccentric handle (4) rotates, the different positions of the cylinder (401) on the eccentric handle (4) cooperate with the semicircular arc surface (106), thereby changing the width of the threaded hole (102), thereby realizing locking / unlocking of the gun barrel. The gun barrel (2) is provided with a positioning hoop (10) and a handle (11) adjacent to each other. The positioning hoop (10) is fixedly connected. One end of the handle (11) is provided with a through hole (1101). The through hole (1101) is clearance-matched with the gun barrel (2). The handle (11) and the gun barrel (2) can generate relative rotation. The outer circumferential surface (1004) of the positioning hoop (10) is evenly distributed with a plurality of through holes (1005). The handle (11) is provided with a T-shaped guide rail (1102) perpendicular to the axial direction of the through hole (1101). A lock buckle (13) is slidably matched in the guide rail (1102). An operating handle (1103) is provided parallel to the through hole (1101) of the handle (11). A blind hole (1104) is provided at the upper end of the guide rail (1102). The upper end of the second compression spring (14) is installed in the blind hole (1104) above the guide rail (1102); the lower end head of the lock buckle (13) is designed with a positioning cylindrical surface (1301); the diameter of the positioning cylindrical surface (1301) is smaller than the diameter of the through hole (1005); the lock buckle (13) is provided with a blind hole (1302) parallel to the positioning cylindrical surface (1301), and the lower end of the second compression spring (14) is installed in the blind hole (1302) on the lock buckle (13); under the action of the second compression spring (14), the positioning cylindrical surface (1301) is inserted into a through hole (1005), so that the handle (11) is fixedly connected with the positioning hoop (10) to lock the circumferential position of the handle (11); an operating handle (1303) is provided above the lock buckle (13).

2. A gun barrel connection structure according to claim 1, characterized in that: The positioning and mounting holes provided on the casing (1) include three stepped holes, wherein the first stepped hole is a first light hole (101), the second stepped hole is the threaded hole (102), and the third stepped hole is a second light hole (103). The diameter of the first light hole (101) is larger than the major diameter of the threaded hole, and the major diameter of the threaded hole is larger than the second light hole (103). A tool withdrawal groove is provided at the intersection of each stepped hole. The length of the rectangular notch (104) is larger than the length of the threaded hole (102) and does not penetrate the first light hole (101) and the second light hole (103). The end face of the casing (1) is provided as a positioning end face (107) perpendicular to the second light hole (103). The gun barrel (2) is provided with four cylindrical surfaces, the first cylindrical surface is the optical axis (201), the second cylindrical surface is the right-handed single-line thread (202), the third cylindrical surface is the optical axis (203), and the fourth cylindrical surface is the optical axis (204); the diameter of the optical axis (204) is greater than the outer diameter of the optical axis (203), the diameter of the optical axis (203) is greater than the outer diameter of the thread (202), and the outer diameter of the thread (202) is greater than the diameter of the optical axis (201); a shaft shoulder (205) is provided in front of the optical axis (204), and an external hexagon (206) is provided in front of the shaft shoulder (205); the positioning hoop (10) and the handle (11) are sleeved on the optical axis (204), and a knife retreat groove is provided at the intersection of each cylindrical surface.

3. The gun barrel connection structure according to claim 1, characterized in that: The positioning hoop (10) and the gun barrel (2) are in interference fit, and a cylindrical cross pin (12) is provided to pass through the positioning hoop (10) and the gun barrel (2) to fix the positioning hoop (10) and the gun barrel (2), and the cross pin (12) and the positioning hoop (10) and the gun barrel (2) are all in interference fit.

4. The gun barrel connection structure according to claim 1, characterized in that: An axial gap is left between the positioning hoop (10) and the handle (11) to ensure that the handle (11) and the gun barrel (2) can rotate relative to each other.

5. The gun barrel connection structure according to claim 1, characterized in that: A boss (1003) is provided on one end surface (1002) of the positioning hoop (10), and a limiting surface (108) is provided on the casing (1) in the longitudinal direction. The boss (1003) is used to be inserted into the limiting surface (108) for limiting position.

6. The method for installing a gun barrel connection structure according to claim 1, characterized in that: S1. Install the handle (11) Install the spring (14) into the blind hole (1102) of the handle (11), install the lock (13) into the guide rail (1102) of the handle (11); lift the lock (13), and then put the handle (11) onto the optical axis (204) of the barrel (2); and make the handle (11) contact the shoulder (205) of the barrel (2); S2, Pre-installed positioning hoop (1) Press the latch (6) to release the eccentric handle (4); sleeve the positioning hoop (10) onto the optical axis (203) of the gun barrel (2); lift the lock buckle (13) so that the positioning cylindrical surface (1301) of the lock buckle (13) is higher than the outer cylindrical surface (1004) of the positioning hoop (10); and then sleeve the positioning hoop (10) onto the optical axis (204) of the gun barrel (2); S3. Install the barrel (2) Insert the gun barrel (2) with the positioning hoop (10) pre-installed into the receiver (1); rotate the gun barrel (2) clockwise to screw the thread (202) on the gun barrel (2) into the threaded hole (102) on the receiver (1); adjust the installation angle of the positioning hoop (10) to make the end face (1002) of the positioning hoop (10) contact the positioning end face (107) of the receiver (1); S4. Adjust the position of the positioning hoop (10) The wrench is clamped on the outer hexagon (206) of the gun barrel (2), and the gun barrel is twisted clockwise so that the boss (1003) of the positioning hoop (10) is inserted into the limiting surface (108) of the receiver (1); at the same time, the required dimension A between the gun barrel (2) and the receiver (1) is satisfied, and a gap is ensured between the positioning hoop (10) and the handle (11) so that the handle (11) and the gun barrel (2) can rotate relative to each other; after the position of the positioning hoop (10) is adjusted, lines are engraved on the positioning hoop (10) and the gun barrel (2) so that the two can accurately return to their original positions after rotation occurs again; S5, fixed positioning hoop (10) Lift the lock catch (13), clamp the outer hexagon (206) of the barrel (2) with a wrench, and loosen the barrel (2) counterclockwise; then continue to rotate the barrel (2) counterclockwise until the thread (202) of the barrel (2) is screwed out of the threaded hole (102) of the receiver (1), and then pull the barrel (2) forward; finally, drill a hole and install the cross pin (12); after the assembly is completed, a barrel assembly (15) is formed; S6. Install the barrel assembly (15) Operate the handle (11), lift the lock (13), and insert the barrel assembly (15) into the receiver (1); rotate the barrel (2) clockwise to screw the thread (202) of the barrel (2) into the threaded hole (102) of the receiver (1) until it is tightened; lower the lock (13), adjust the angle of the handle (11), and insert the positioning cylindrical surface (1301) of the head of the lock (13) into a through hole (1005) of the positioning hoop (10), and rotate the handle (11) clockwise to tighten the barrel again (15). 2), so that the end face (1002) of the positioning hoop (10) contacts the positioning end face (107) of the casing (1), and at the same time, the boss (1003) on the positioning hoop (10) is inserted into the limiting surface (108) of the casing (1) for positioning; the locking eccentric handle (4) is rotated to reduce the diameter of the threaded hole (102), and the clamping arm of the tenon (6) contacts the step (303) of the screw rod (3); the installation angle of the nut (5) is adjusted with a wrench, and the locking torque of the eccentric handle (4) is adjusted to the right position.

7. The method for installing a gun barrel connection structure according to claim 6, characterized in that: The method of disassembling the barrel assembly (15) is as follows: Press the latch (6) to release the eccentric handle (4); lower the lock buckle (13), adjust the angle of the handle (11) so that the positioning cylindrical surface (1301) of the head of the lock buckle (13) is inserted into a through hole (1005) of the positioning hoop (10), and rotate the handle (11) counterclockwise to loosen the barrel assembly (15); then lift the lock buckle (13) and continue to rotate the barrel (2) counterclockwise by hand until the thread (202) of the barrel (2) is screwed out of the threaded hole (102) of the receiver (1), and then pull the barrel assembly (15) forward.

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