A spiral guide machine head body structure

Abstract

The present invention discloses a spiral guide machine head body structure, comprising a firing pin, a firing pin spring, a machine frame, a firing pin pin, a machine head rotating pin and a machine head body, wherein a through hole is provided on the machine head rotating pin, a through hole for the machine head rotating pin to pass through is radially provided on the top of the front end of the machine frame, a central through hole is provided inside the machine frame, the through hole and the central through hole are communicated, and a pin hole is radially provided at the rear end of the machine frame; a machine head body is provided at the front end of the machine frame, a locking tooth is provided at the front end of the machine head body, a guide spiral groove is provided in the circumferential direction of the rear end, the guide spiral grooves are symmetrically arranged along the center of the machine head body, a central through hole for the firing pin to pass through is axially provided inside the machine head body, the guide spiral groove and the central through hole are communicated, the machine head body extends into the central through hole of the machine frame and is connected with the machine frame through the machine head rotating pin, the machine head body is driven to complete the opening and closing actions through the movement of the machine head rotating pin in the guide spiral groove, the firing pin passes through the machine frame, the machine head rotating pin and the central hole of the machine head body are connected as a whole.

Description

Technical Field

[0001] The invention relates to the technical field of firearms, and in particular to a spiral guide machine head structure. Background Art

[0002] For the current general fully automatic and semi-automatic firearms, many of them adopt the machine head rotary locking structure. They arrange and process spiral grooves on the machine frame and process guide tenons on the machine head body (as shown in 1). The tenons fit into the guide grooves, so that the machine head body moves and rotates along the spiral grooves of the machine frame under the drive of the machine frame to achieve the opening and closing action. This layout form adds a guide tenon on one side of the tail end of the machine head body. During the opening and closing process, the spiral groove of the machine frame applies a backward force to the machine head body. Since this force is not colinear with the center of the machine head body (i.e., the center of rotation), the machine head body is subjected to tensile and compressive stresses caused by the bending moment. At the same time, the forces borne by each locking tooth on the locking support surface and different parts of each tooth are different, which has an adverse effect on the life of the machine head body and the smoothness of the opening and closing action. At the same time, the addition of the guide tenon to the machine head body makes the structure of the machine head body more complicated, and the processing technology and the consistency of the parts quality are more difficult to guarantee. It also affects the smoothness of the bullet entering and exiting the chamber, especially for some high-precision automatic rifles. Summary of the invention

[0003] The purpose of the present invention is to provide a spiral guide machine head body structure to address the problems in the prior art of tensile and compressive stresses caused by the bending moment on the machine head body when the bolt is opened and locked, poor smoothness of opening and closing actions, complex structure and difficulty in ensuring consistency of processing technology. By improving the stress condition of the machine head body of the current rotary locking method, the smoothness of chambering and opening and closing is improved, and the structure and process are optimized.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A spiral guide machine head body structure, including a firing pin, a firing pin spring sleeved on the firing pin, a machine frame, a firing pin pin connecting the firing pin and the machine frame, a machine head rotating pin and a machine head body, the machine head rotating pin is provided with a through hole for the firing pin to pass through, the top of the front end of the machine frame is radially provided with a through hole for the machine head rotating pin to pass through, the machine frame is axially provided with a central through hole inside, the through hole and the central through hole are connected, and the rear end of the machine frame is radially provided with a pin hole for the firing pin to pass through; a machine head body is provided at the front end of the machine frame, and a closed machine head body is provided at the front end of the machine head body The locking tooth has a guide spiral groove on the circumference of the rear end, and the guide spiral groove is symmetrically arranged along the center of the head body. A central through hole is axially provided inside the head body for the firing pin to pass through, and the guide spiral groove and the central through hole are connected. The head body extends into the central through hole of the machine frame and is connected to the machine frame through the machine head rotating pin. The movement of the machine head rotating pin in the guide spiral groove drives the head body to complete the opening and closing locking action along the guide spiral groove. The firing pin passes through the machine frame, the machine head rotating pin and the center hole of the head body from back to front in sequence and is connected as a whole through the firing pin pin.

[0006] Preferably, the head rotating pin passes through the frame and the head body, and is clearance-matched with the through hole of the frame and the guide spiral groove of the head body, thereby ensuring power transmission between the frame and the head body and also ensuring the flexibility of movement between the frame and the head body.

[0007] Preferably, the clearance fit distance is 0.05mm-0.1mm.

[0008] Preferably,

[0009] Beneficial effects of the present invention:

[0010] 1. The present invention does not change the original rotary locking method. The guide spiral grooves are arranged symmetrically along the center of the machine head body in the circumferential direction of the machine head body, and a machine head rotating pin is provided on the machine frame. The machine frame and the machine head body are connected by the machine head rotating pin assembled on the machine frame, and the movement of the machine head rotating pin in the guide spiral groove of the machine head body drives the machine head body to realize the opening and closing locking action along the spiral groove;

[0011] 2. The guide tenon on the existing bolt body is removed. Compared with the traditional bolt body with the guide tenon, under the same unlocking speed and energy of the bolt frame, the centrally symmetrical spiral guide surface makes the bolt body stress also centrally symmetrical, no longer subject to bending moment stress, and the stress magnitude is only half of the original stress, which greatly improves the stress of the bolt parts during the unlocking and closing process;

[0012] 3. After the guide tenon is removed, the processing technology and parts quality and consistency of the centrally symmetrical nose body are greatly improved. During the process of bullet feeding and shell ejection, the force on the circumferential direction of the bullet base is more balanced, which improves the damage to the chamber and shell and the accuracy of the projectile;

[0013] 4. The smoothness of the opening and closing process of the machine head body is improved, the space size of the machine head body and the frame is smaller, the structure is better, and the processability of the machine head body and the frame is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a machine head body with a guide tenon in the prior art;

[0015] Figure 2 It is a structural schematic diagram of the present invention;

[0016] Figure 3 It is a structural schematic diagram of the machine head body in the present invention;

[0017] Figure 4 is a cross-sectional view of the present invention;

[0018] Figure 5 An exploded view of the present invention;

[0019] Reference numerals

[0020] Machine head body, 2. Machine frame, 3. Machine head rotating pin, 4-firing pin spring, 5-firing pin pin, 6. firing pin,

[0021] 101, guide spiral groove, 201, through hole, 202, pin hole; DETAILED DESCRIPTION

[0022] The working principle and structure of the present invention are further described in detail below in conjunction with the embodiments and drawings.

[0023] like Figure 2-Figure 5 As shown, a spiral guide machine head body structure includes a firing pin 6, a firing pin spring 4 sleeved on the firing pin 6, a machine frame 2, a firing pin pin 5 connecting the firing pin 6 and the machine frame 2, a machine head rotating pin 3 and a machine head body 1, the machine head rotating pin 3 is provided with a through hole for the firing pin 6 to pass through, the top of the front end of the machine frame 2 is radially provided with a through hole 201 for the machine head rotating pin 3 to pass through, the inside of the machine frame 2 is axially provided with a central through hole, the through hole 201 and the central through hole are connected, and the rear end of the machine frame 2 is radially provided with a pin hole 202 for the firing pin to pass through; a machine head body 1 is provided at the front end of the machine frame 2, and the front end of the machine head body 1 is provided with There are locking teeth, and a guide spiral groove 101 is provided on the circumference of the rear end. The guide spiral groove 101 is symmetrically arranged along the center of the nose body 1. A central through hole is axially provided inside the nose body 1 for the firing pin 6 to pass through. The guide spiral groove 101 and the central through hole are connected. The nose body 1 extends into the central through hole of the machine frame 2 and is connected to the machine frame 2 through the machine head rotating pin 3. The movement of the machine head rotating pin 3 in the guide spiral groove 101 drives the machine head body 1 to complete the opening and closing locking action along the guide spiral groove 101. The firing pin 6 passes through the machine frame 2, the machine head rotating pin 3 and the center hole of the nose body 1 from back to front in sequence and is connected as a whole through the firing pin pin 5.

[0024] In this embodiment, in order to ensure the power transmission between the machine frame 2 and the machine head body 1 and at the same time ensure the flexibility of movement of the two, the machine head rotating pin 3 passes through the machine frame 2 and the machine head body 1, and is clearance-matched with the through hole of the machine frame 2 and the guide spiral groove 101 of the machine head body, and the clearance is 0.05mm-0.1mm.

[0025] like Figure 2 , Figure 4 , Figure 5 As shown, the machine head rotating pin 3 is processed with a firing pin clearance hole perpendicular to the axis center, which also prevents the machine head rotating pin 3 from falling off; the firing pin 6 runs through the entire machine head body 1 and the central through hole of the machine frame, and the firing pin 6 is limited by the firing pin pin 5 fixed on the machine frame and reset under the action of the spring force of the firing pin spring 4.

[0026] Compared with the traditional machine head body with guiding tenon, under the condition of the same unlocking speed and energy of the machine frame, the centrally symmetrical guiding spiral surface makes the force on the machine head body also centrally symmetrical, and no longer bears bending moment stress. The stress magnitude is only half of the original stress, and the stress condition is greatly improved.

[0027] from Figure 1 , Figure 3 In comparison, since the nose body structure of the present invention has no guide tenons, the processing manufacturability and part quality and consistency of the centrally symmetrical nose body are greatly improved, and the force on the circumferential direction of the bullet base during the process of bullet loading and shell ejection is more balanced, which improves the damage to the chamber and shell as well as the accuracy of the projectile. The opening and closing process of the nose body is smoother, and the structure and processability of the nose body are better.

[0028] The opening and closing process of the present invention is as follows:

[0029] Unlocking: The machine frame transmits the horizontal movement to the machine head body through the machine head rotating pin. The machine head rotating pin drives the machine head body to rotate along the guide spiral groove of the machine head body to unlock and move backward to complete the unlocking and shell extraction action.

[0030] Locking: During the bolt return and feeding process, the movement of the bolt body is opposite to the above movement sequence.

[0031] The present invention provides a centrally symmetrical guide spiral groove on the machine head body so that the force applied to the machine head body during the opening and closing process is also centrally symmetrical and no longer bears bending moment stress, thereby greatly improving the stress condition of the machine head body and improving the smoothness of the opening and closing process. At the same time, the structure of the parts is more optimal and the processability is greatly improved.

Claims

1. A spiral guide machine head structure, comprising a firing pin, a firing pin spring sleeved on the firing pin, a machine frame, a firing pin pin connecting the firing pin and the machine frame, a machine head rotating pin and a machine head body, wherein the machine head rotating pin is provided with a through hole for the firing pin to pass through, characterized in that: A through hole is radially provided at the top of the front end of the machine frame for the machine head rotating pin to pass through, and a center through hole is axially provided inside the machine frame, and the through hole and the center through hole are connected, and a pin hole is radially provided at the rear end of the machine frame for the firing pin pin to pass through; a machine head body is provided at the front end of the machine frame, and a locking tooth is provided at the front end of the machine head body, and a guide spiral groove is circumferentially provided at the rear end, and the guide spiral grooves are symmetrically arranged along the center of the machine head body, and a center through hole is axially provided inside the machine head body for the firing pin to pass through, and the guide spiral groove and the center through hole are connected, the machine head body extends into the center through hole of the machine frame and is connected to the machine frame through the machine head rotating pin, and the movement of the machine head rotating pin in the guide spiral groove drives the machine head body along the guide spiral groove to complete the opening and closing action, and the firing pin passes through the machine frame, the machine head rotating pin and the center hole of the machine head body in sequence from back to front and are connected as a whole through the firing pin pin.

2. A spiral guide machine head structure according to claim 1, characterized in that: The machine head rotating pin passes through the machine frame and the machine head body, and is clearance-matched with the through hole of the machine frame and the guide spiral groove of the machine head body.

3. A spiral guide machine head structure according to claim 2, characterized in that: The clearance fit distance is 0.05mm-0.1mm.

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