A machine gun launcher structure with single shot function

Abstract

The application discloses a machine gun launcher with single continuous shooting function, which comprises a launcher seat, a sliding block, a release device, a continuous shooting blocking iron, a single shooting blocking iron, a blocking iron shaft, a single shooting blocking iron spring, a safety device, a safety device top head, a sliding block spring, a plug and a plug pin. The application is suitable for open-chamber standby weapons, and a double-way hanging machine structure of the continuous shooting blocking iron and the single shooting blocking iron is arranged, and the working time of the single shooting blocking iron is controlled through the safety device, so that the single shooting control function of the machine gun is realized. The launcher can switch among the continuous shooting, the single shooting and the safety state, and the switching operation is simple, quick and good in man-machine efficiency. The launcher structure is independent, and the universality is high, so that the launcher can be installed on various types of machine guns as an independent module and has wide application platform.

Description

Technical Field

[0001] This invention relates to the field of machine gun technology, and in particular to a machine gun firing mechanism structure with single-shot / burst-fire capability. Background Technology

[0002] The firing mechanism is the control mechanism that controls the start and stop of firearms. It is an important part of human-machine interaction and directly affects the reliability and accuracy of shooting. Machine guns, with their continuous fire output and high mass of automatic mechanisms, are characterized by high chamber temperature, simple and durable firing mechanisms. Machine guns are often designed for open-bolt standby, while the firing mechanism usually only has a structure for automatic fire control.

[0003] With improvements in firearm performance and ammunition quality, machine gun accuracy has been further enhanced. Special combat conditions necessitate single-shot firing capabilities for machine guns, enabling long-range single-shot sniping. Simultaneously, all machine gun firing accuracy correction requires single-shot firing. The current quick-trigger single-shot operation is unreliable, making it essential to equip machine gun launchers with single-shot control functionality. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a machine gun launcher structure with single-shot and burst-fire functions, which is suitable for open-bolt standby weapons. It has single-shot and burst-fire control functions and can switch between burst-fire, single-shot, and safety modes. The entire launcher is an independent module with a wide range of application platforms.

[0005] The objective of this invention is achieved as follows:

[0006] A machine gun firing mechanism with single-shot / burst fire capability includes a firing base (1), a frame (13), and a safety (8). A slider (2) is longitudinally slidably fitted inside the firing base (1). The slider (2) moves when pressed by the trigger of the machine gun. The front end of the slider (2) is limited to its forward limit position by the end wall of the firing base (1). A flattened circular slider hole (203) is longitudinally provided in the middle section of the slider (2). A firing base hole (103) is provided on the side wall of the firing base (1). The safety (8) includes a safety shaft (804), which passes through the firing base hole (103) and the slider hole (203). The slider hole (203) provides clearance for the safety shaft (804). A slider spring is longitudinally provided at the rear end of the slider (2). The hole (204) is provided with a safety top head (9), a slider spring (10), and a plug (11) in sequence. The circumferential wall of the safety shaft (804) is provided with three top head grooves (801). The safety top head is used to press against the top head groove (801) of the safety (8) to limit the circumferential position of the safety shaft (804). The three top head grooves (801) correspond to the continuous firing state, the single firing state, and the safety state, respectively. The plug (11) is fixed on the slider (2). The slider (2) is provided with a relief frame (208). The relief frame (208) is located on the bottom wall of the slider hole (203). Only in the single firing state and the continuous firing state, the position of the relief surface (803) is downward facing the relief frame (208) so that the slider (2) can slide.

[0007] The transmitter base (1) is hinged with a sear shaft (6) to a release device (3), a continuous-fire sear (4), and a single-fire sear (5). The lower end of the release device (3) is provided with a cam (301). The bottom wall of the transmitter base (1) is provided with a slider slot (202). The cam (301) is embedded in the slider slot (202). The front and rear walls of the cam (301) cooperate with the front and rear groove walls of the slider slot (202) so that the rotation of the release device (3) and the translation of the slider (2) can be linked. The upper end of the release device (3) is provided with a release device (3). A rearward-extending pressure rod (302) is used to press down the continuous-fire sear (4). The upper end of the continuous-fire sear (4) is provided with a continuous-fire sear pressure groove (401). When the pressure rod (302) presses down the continuous-fire sear (4), the pressure rod (302) enters the continuous-fire sear pressure groove (401), making the upper end face of the release device (3) flush with the upper end face of the release device (3). A safety stop bar (505) is provided at the rear of the lower end of the single-fire sear (5). A single-fire sear spring (7) is provided between the rear end of the single-fire sear (5) and the transmitter base (1). A single-shot sear spring (7) is used to lift the single-shot sear (5) upwards. A clearance groove (802) is provided on the vertical surface of the safety shaft (804) corresponding to the safety stop (505). Only in the single-shot state can the safety stop (505) of the single-shot sear (5) rise under the action of the single-shot sear spring (7) and pass over the safety shaft (804). A clearance surface (803) is provided on the safety shaft (804). A sear limiting surface (104) is provided on the front wall of the transmitter base (1). A continuous-fire sear is provided at the front end of the continuous-fire sear (4). Limiting surface (402), the front end of the single-shot sear (5) is provided with a single-shot sear limiting surface (502), the continuous-fire sear limiting surface (402), the single-shot sear limiting surface (502) cooperate with the sear limiting surface (104) to limit the extreme position of the continuous-fire sear (4) and the single-shot sear (5) to rise, the frame (13) and the continuous-fire sear (4) are respectively provided with continuous-fire sear mounting surfaces (1301, 403), the frame (13) and the single-shot sear (5) are respectively provided with single-shot sear mounting surfaces (1302, 503);

[0008] The slider (2) has a protrusion at its front, the top of which is a slider contact surface (206) used to limit the position of the continuous-fire sear (4). The rear end of the protrusion is a slider slope (207), the lower part of which has an opening forming a slider head (205). The lower end of the single-fire sear (5) has a reset lever (504) in the opposite direction to the safety stop lever (505). The single-fire sear (5) is in the safety stop. In the firing state, the slider (205) presses on the reset lever (504) of the single-shot sear (5), limiting the position of the single-shot sear (5). The mating surface of the slider (205) and the safety stop lever (505) is a guide slope. After pressing the slider (2) forward, the single-shot sear (5) can rise by relying on the single-shot sear spring (7). When the slider (2) is released and reset, the slider (2) and the slider (205) can press the single-shot sear (5) reset lever (504) to make the single-shot sear (5) sink and reset.

[0009] Single-shot launcher: During loading, pull the launcher frame (13) backward. The launcher frame presses the rotating rod (302) downward at an angle. The cam (301) of the release device (3) drives the slider (2) to move forward through the slider slot (202). Under the limiting action of the safety shaft (8) on the safety top (9), the slider spring (10) is compressed. When the launcher frame (13) contacts the repeating sear (4), the release device (3) drives the slider (2) to move forward. After the block overlap surface (206) makes way for the continuous firing sear (4), the pressure rod (302) is inserted into the continuous firing sear pressure groove (401), and the continuous firing sear overlap surface (404) is disengaged from the limit of the slider overlap surface (206). The frame (13) presses the continuous firing sear (4). At this time, the slider (205) has disengaged from the reset lever (504), and the single-shot sear (5) rises under the action of the single-shot sear spring (7). 5) The reset lever (504) abuts against the sear ramp (405), causing both the continuous-fire sear (4) and the single-fire sear (5) to begin resetting under the action of the single-fire sear spring (7) and pressing against the frame (13). When the frame (13) is pulled back to the bottom by the single-fire sear (5), the slider spring (10) drives the slider (2) to reset, and the slider ramp (207) lifts the continuous-fire sear ramp (405), causing the continuous-fire sear to resume firing. The sear (4) rises to reset, and at the same time the slider (205) presses down the reset lever (504) to make the single-shot sear (5) sink; after the release frame (13), the continuous-shot sear mounting surface (1301) abuts against the continuous-shot sear mounting surface (403), the continuous-shot sear limiting surface (402) abuts against the sear limiting surface (104), and the continuous-shot sear overlapping surface (404) abuts against the slider overlapping surface (206) to achieve reliable mounting;

[0010] Single-shot firing: After the trigger is pulled, the trigger drives the slider (2) to move forward. When the slider (2) moves to the slider overlap surface (206) to make way for the automatic fire sear (4), the automatic fire sear mounting surface (1301) of the frame (13) presses down on the automatic fire sear mounting surface (403), and the automatic fire sear ramp (405) presses down on the slider ramp (207), so that the automatic fire sear overlap surface (404) disengages from the slider overlap surface (206), and the frame (13) moves forward to fire; if the slider (2) moves to the slider overlap surface (206), the automatic fire sear mount surface (404) disengages from the slider overlap surface (206), and the frame (13) moves forward to fire. 06) After the sear (4) gives way, the frictional resistance fails to make the sear mounting surface (1301) of the frame (13) slide away from the sear mounting surface (403). Because the trigger is pulled, the slider (2) will continue to move forward, driving the release device (3) to rotate and causing the pressure rod (302) to rotate, pressing the sear pressure groove (401), which will also force the sear (4) to rotate and release the frame (13). Since the trigger is still pulled after the frame (13) is released, the slider (2) is in the front limit position. At this time, the slider head (205) and the single-shot sear (5) reset lever (504) disengage. Driven by the single-shot sear spring (7), the single-shot sear (5) rises until the single-shot sear limiting surface (502) abuts against the sear limiting surface (104). After a single shot is fired, the bolt carrier (13) retracts, pressing down the single-shot sear (5). When the bolt carrier (13) retracts to its position, the single-shot sear (5) has returned to its upward position. When the bolt carrier (13) advances, the single-shot sear mounting surface (1302) will abut against the single-shot sear mounting surface (503), thus pressing the bolt carrier ( 13) Restriction; When the trigger is released, the slider (2) moves backward by the slider spring (10), the slider head (205) presses against and slides on the reset lever (504), causing the single-shot sear mounting surface (503) to sink, while the slider ramp (207) drives the automatic firing sear ramp (405) to lift the automatic firing sear (4). After the frame (13) returns to the forward position, the automatic firing sear mounting surface (1301) presses against the automatic firing sear mounting surface (403) to achieve reliable firing. After the trigger is released, it is pulled again, that is, the single-shot firing action is cycled.

[0011] Preferably, the slider (2) has guide rail protrusions (201) on both sides, and the transmitter base (1) has transmitter base guide rail grooves (101) on both inner walls. The guide rail protrusions (201) are inserted into the transmitter base guide rail grooves (101) to form a sliding fit.

[0012] Preferably, the transmitter (1) is provided with a transmitter seat spring hole (102), and the single-shot sear (5) is provided with a single-shot sear spring hole (501) accordingly. The two ends of the single-shot sear spring (7) are installed in the transmitter seat spring hole (102) and the single-shot sear spring hole (501).

[0013] Preferably, the safety device (8) is provided with a lever, which is located outside the transmitter.

[0014] Preferably, both the single-shot sear (5) and the continuous-shot sear (4) have mounting grooves. The continuous-shot sear (4) is located in the mounting groove of the single-shot sear (5), and the release device (3) is located in the mounting groove of the continuous-shot sear (4), so that the continuous-shot sear limiting surface (402) and the continuous-shot sear mounting surface (403) are located on different surfaces from the single-shot sear limiting surface (502) and the single-shot sear mounting surface (503).

[0015] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0016] 1. This invention achieves single-shot firing control of the machine gun by setting up a dual-path mounting structure of continuous-fire sear and single-shot sear, and controlling the working timing of the single-shot sear through a safety control.

[0017] 2. The transmitter of this invention has three modes: continuous firing, single firing, and safety firing. The switching operation is simple and quick, and the human-machine interface is efficient.

[0018] 3. It has an independent structure, strong versatility, and can be modularly installed on various types of machine guns, making it valuable for a wide range of platform applications. Attached Figure Description

[0019] Figure 1 This is a diagram of the transmitter system of the present invention;

[0020] Figure 2 This is a schematic diagram of the machine frame mounting position structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the initial state of the single-shot state of the present invention;

[0022] Figure 4 This is a schematic diagram of the single-shot state before the trigger is released and the trigger is held in place.

[0023] Figure 5 This is a schematic diagram of the single-shot state of the present invention, showing the single-shot sear about to be released.

[0024] Figure 6 This is a schematic diagram of the single-shot state after the trigger is released and the gun is held in place.

[0025] Figure 7 This is a schematic diagram of the initial state of the continuous firing state of the present invention;

[0026] Figure 8 This is a schematic diagram of the insurance status of the present invention.

[0027] Figure Labels

[0028] In the attached diagram, 1 is the transmitter base, 2 is the slider, 3 is the release mechanism, 4 is the continuous firing sear, 5 is the single firing sear, 6 is the sear shaft, 7 is the single firing sear spring, 8 is the safety device, 9 is the safety pin, 10 is the slider spring, 11 is the plug, 12 is the plug pin, and 13 is the frame.

[0029] 101 is the guide rail groove, 102 is the transmitter mount spring hole, 103 is the transmitter mount hole, and 104 is the sear limiting surface.

[0030] 201 is the guide rail protrusion, 202 is the slider slot, 203 is the slider hole, 204 is the slider spring hole, 205 is the slider head, 206 is the slider overlap surface, 207 is the slider slope, and 208 is the clearance frame.

[0031] 301 is a cam, and 302 is a pressure rod.

[0032] 401 is the sear groove for continuous firing, 402 is the sear limiting surface for continuous firing, 403 is the sear mounting surface for continuous firing, 404 is the sear overlapping surface for continuous firing, and 405 is the sear inclined surface for continuous firing.

[0033] 501 is the single-shot sear spring hole, 502 is the single-shot sear limiting surface, 503 is the single-shot sear mounting surface, 504 is the reset lever, and 505 is the safety stop lever.

[0034] 801 is the top groove, 802 is the clearance groove, 803 is the clearance surface, and 804 is the safety shaft.

[0035] 1301 is a continuous-fire sear mount, and 1302 is a single-fire sear mount. Detailed Implementation

[0036] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] The present invention uses the firing direction as the front end.

[0038] See Figures 1-8A machine gun launcher with single-shot and burst-fire functions includes: a launcher base 1, a slider 2, a release mechanism 3, a burst-fire sear 4, a single-shot sear 5, a sear shaft 6, a single-shot sear spring 7, a safety 8, a safety pin 9, a slider spring 10, a plug 11, and a plug pin 12. The launcher base 1 is the base of the entire launcher, housing functional components and externally connecting to the machine gun receiver. The slider 2 has guide rail protrusions 201 on both sides, which insert into the guide rail grooves 101 of the launcher base. The release mechanism 3, the burst-fire sear 4, and the single-shot sear 5 are hinged to the launcher base 1 via the sear shaft 6. The release mechanism 3 can rotate around the sear shaft 6 and has a cam 301 on it. The front and rear walls of the cam 301 cooperate with the front and rear groove walls of the slider slot 202, enabling the rotation of the release mechanism 3 and the translation of the slider 2 to be linked. The translation of the slider 2 can drive the release mechanism 3 to rotate, and the burst-fire sear 4 and the single-shot sear 5 can rotate around the sear shaft 6. The single-shot sear spring 7 is installed in the transmitter mount spring hole 102 and the single-shot sear spring hole 501; the safety 8 passes through the transmitter mount hole 103 and the slider hole 203; the slider hole 203 is a longitudinally oriented strip hole, and the safety top 9 is placed in the slider spring hole 204, pressing against the top groove 801 of the safety 8, defining the circumferential position of the safety 8; the slider spring 10 is placed in the slider spring hole 204, applying a pressing force to the safety top 9; the plug 11 is installed in the slider spring hole 204 to press against the slider spring 10; the plug pin 12 passes through both the slider 2 and the plug 11, making them rigidly connected.

[0039] Furthermore, the transmitter is designed with a continuous firing sear 4 and a single firing sear 5 mechanism. The corresponding frame 13 is provided with a continuous firing sear mounting surface 1301 and a single firing sear mounting surface 1302. The single firing sear 5 is activated by moving the safety 8 to realize the single firing and continuous firing and control functions.

[0040] The safety mechanism 8 is equipped with a lever located outside the transmitter. The safety shaft 804 has three top grooves 801, with tops 9 used to prevent rotation, corresponding to three states: continuous fire, single fire, and safety. The safety shaft 804 has a clearance groove 802, allowing the safety stop lever 505 of the single-fire sear 5 to pass over the safety shaft 804 only in single-fire mode, thus raising the single-fire sear 5. The safety shaft 804 has a clearance surface 803, and the slider 2 has a clearance frame 208. Only in single-fire and continuous fire modes can the clearance surface 803 pass through the clearance frame 208, allowing the slider 2 to slide freely. However, in the safety state, there is no clearance surface 803 at the point where the safety shaft 804 and clearance frame 208 move, blocking the slider 2 and completely restricting the entire firing mechanism's movement, thus achieving the mechanism's safety function.

[0041] When the single-shot sear 5 is in the safety single-shot state, after pressing the slider 2 forward, it can rise up by relying on the single-shot sear spring 7. When the slider 2 is released and reset, the slider head 205 can press the single-shot sear 5 reset lever 504 to make the single-shot sear 5 sink down and reset.

[0042] The slider 2 and the release device 3 are linked by the slider slot 202 and the cam 301. Pressing the slider 2 can cause the release device 3 to rotate and force the single-shot sear 5 to be pressed. At the same time, pressing the release device 3 lever 302 can cause the slider 2 to slide forward, releasing the connection between the slider 2 and the continuous-fire sear 4, so that the continuous-fire sear 4 can rotate and work.

[0043] The working process of this invention:

[0044] Single-shot auto-attack: See Figure 3 , Figure 4 During loading, the frame 13 is pulled back, and the frame will press the pressure rod 302 downward at an angle. The cam 301 of the release device 3 moves the slider 2 forward through the slider slot 202, and the slider spring 10 is compressed. When the frame 13 contacts the repeating sear 4, the release device 3 has moved the slider 2 more than the distance D1. The distance D1 is the minimum translation distance for the slider overlap surface 206 to make way for the repeating sear 4. The pressure rod 302 has been inserted into the repeating sear pressure groove 401, and the repeating sear overlap surface 404 is separated from the slider overlap surface 206. The frame 13 can press the repeating sear 4. At this time, the slider 205 has been separated from the reset lever 504. The single-shot sear 5 rises under the action of the single-shot sear spring 7. The reset lever 504 of the single-shot sear 5 abuts against the sear slope 405, so that both the repeating sear 4 and the single-shot sear 5 are reset under the action of the single-shot sear spring 7 and pressed against the frame 13. When the frame 13 is pulled back to the bottom, the slider spring 10 drives the slider 2 to reset, the slider ramp 207 raises the continuous fire sear ramp 405, causing the continuous fire sear 4 to rise and reset. At the same time, the slider head 205 presses down the reset lever 504, causing the single-fire sear 5 to sink. See also Figure 5 After the release frame 13, the automatic fire sear mounting surface 1301 will press against the automatic fire sear mounting surface 403, the automatic fire sear limiting surface 402 will press against the sear limiting surface 104, and the automatic fire sear overlapping surface 404 will press against the slider overlapping surface 206, thus achieving reliable firing.

[0045] Single-shot firing: See Figures 3-6After the trigger is pulled, the trigger will drive the slider 2 to move forward. When the slider 2 has moved a distance D1, the sear mounting surface 1301 of the receiver 13 will press down on the sear mounting surface 403. The sear ramp 405 will press against the slider ramp 207, causing the sear contact surface 404 to disengage from the slider contact surface 206, thus enabling the receiver 13 to fire forward. If the slider 2 has moved a distance D1 but the frictional resistance prevents the sear mounting surface 1301 of the receiver 13 from sliding off the sear mounting surface 403, the slider 2 will continue to move forward after the trigger is pulled. This will drive the release mechanism 3 to rotate, causing the pressure rod 302 to rotate and press the sear pressure groove 401. This will also force the sear 4 to rotate and release the receiver 13. Since the trigger is still pulled after the frame 13 is released, the slider 2 is at its foremost position. At this time, the slider 205 and the single-shot sear 5 reset lever 504 disengage. Driven by the single-shot sear spring 7, the single-shot sear 5 will rise until the single-shot sear limiting surface 502 abuts against the sear limiting surface 104 (as shown). Figure 4 (Middle position). After a single shot, the receiver 13 retracts, pressing down the single-shot sear 5 (e.g., Figure 4 In the middle position), when the frame 13 is retracted to its position, the single-shot sear 5 has resumed its upward movement. When the frame 13 advances, the single-shot sear mounting surface 1302 will press against the single-shot sear mounting surface 503 (the continuous-fire sear mounting surface 1301 and the single-shot sear mounting surface 1302 are misaligned, such as...). Figure 2 Single-shot sear mount surface 503 Figure 4 (In the middle position), the bolt carrier 13 is restrained. When the trigger is released, the slider 2 retracts due to the slider spring 10, and the slider 205 abuts against and slides on the reset lever 504, causing the single-shot sear latching surface 503 to sink. At the same time, the slider ramp 207 drives the automatic-fire sear ramp 405 to raise the automatic-fire sear 4. When the automatic-fire sear contact surface 404 just enters the slider contact surface 206, there is still a distance D2 between the single-shot sear latching surface 503 and the single-shot sear latching surface 1302, and a gap D3 between the automatic-fire sear latching surface 1301 and the automatic-fire sear latching surface 403 (e.g., ...). Figure 5 In the middle position, when the single-shot sear mounting surface 503 is completely disengaged from the single-shot sear mounting surface 1302, the frame 13 advances a small distance, and the automatic firing sear mounting surface 1301 presses against the automatic firing sear mounting surface 403 to achieve reliable firing. After the trigger is released, it can be pulled again to achieve the single-shot firing action in a cycle.

[0046] Rapid fire: See Figure 7In continuous fire mode, the safety 8's clearance slot 802 has deviated, and the safety shaft 804 will block the safety stop lever 505, causing the single-shot sear 5 to sink. During the entire cocking and firing process, the single-shot sear 5 and single-shot sear spring 7 will not participate in the action, and the cocking action of the other parts is the same as that of single-shot cocking. After pulling the trigger, the slider 2 moves forward to the bottom, and the continuous fire sear 4 is controlled to sink. After the bolt carrier 13 has repeatedly returned to fire, the continuous fire sear 4 can only rise to restrict the return of the bolt carrier 13 after the trigger is released to reset the slider 2, thus achieving continuous fire control.

[0047] Insurance: See Figure 1 , Figure 8 The safety shaft 804 and the slider hole 203 are in a circular surface fit. In single-shot and burst-fire modes, the clearance surface 803 on the safety shaft 804 can pass through the clearance frame 208 (the clearance frame 208 is a boss located on the bottom wall of the slider hole 203, which restricts sliding by interfering with the safety shaft 804; when the clearance surface 803 faces the clearance frame 208, it makes contact and interference), allowing the slider 2 to slide freely. In the safety state, there is no clearance surface 803 at the moving part of the safety shaft 804 and the clearance frame 208, which will block the movement of the slider 2, and the entire firing mechanism's movement will be completely restricted, realizing the mechanism's safety function.

[0048] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended 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 to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A machine gun firing mechanism with single-shot / burst firing capability, characterized in that: The system includes a transmitter base (1), a frame (13), and a safety (8). A slider (2) is longitudinally fitted inside the transmitter base (1). The slider (2) moves when pressed by the trigger of the machine gun. The front end of the slider (2) is limited to its front limit position by the end wall of the transmitter base (1). A flattened circular slider hole (203) is provided in the middle section of the slider (2) longitudinally. A transmitter base hole (103) is provided on the side wall of the transmitter base (1). The safety (8) includes a safety shaft (804). The safety shaft (804) passes through the transmitter base hole (103) and the slider hole (203). The slider hole (203) makes way for the safety shaft (804). A slider spring hole (204) is provided longitudinally at the rear end of the slider (2). The slider spring hole (204) contains… The device is provided with a safety top head (9), a slider spring (10), and a plug (11) in sequence. The circumferential wall of the safety shaft (804) is provided with three top head grooves (801). The safety top head is used to press against the top head groove (801) of the safety (8) to limit the circumferential position of the safety shaft (804). The three top head grooves (801) correspond to the continuous firing state, the single firing state, and the safety state, respectively. The plug (11) is fixed on the slider (2). The slider (2) is provided with a relief frame (208). The relief frame (208) is located on the bottom wall of the slider hole (203). The safety shaft (804) is provided with a relief surface (803). Only in the single firing state and the continuous firing state, the position of the relief surface (803) is downward facing the relief frame (208) so that the slider (2) can slide. The transmitter base (1) is hinged to the release device (3), the continuous-fire sear (4), and the single-fire sear (5) via a sear shaft (6). The lower end of the release device (3) is provided with a cam (301), and the bottom wall of the slider (2) is provided with a slider slot (202). The cam (301) is embedded in the slider slot (202), and the front and rear walls of the cam (301) cooperate with the front and rear groove walls of the slider slot (202) so that the rotation of the release device (3) and the translation of the slider (2) can be linked. The upper part of the release device (3) The end is provided with a rearwardly extending pressure rod (302), which is used to press down the continuous firing sear (4). The upper end of the continuous firing sear (4) is provided with a continuous firing sear pressure groove (401). When the pressure rod (302) presses down the continuous firing sear (4), the pressure rod (302) enters the continuous firing sear pressure groove (401), so that the upper end face of the release device (3) is flush with the upper end face of the continuous firing sear (4). The lower rear end of the single-shot sear (5) is provided with a safety stop rod (505). Between the rear end of the single-shot sear (5) and the transmitter base (1) is a safety stop rod (505). A single-shot sear spring (7) is used to lift the single-shot sear (5) upwards. A clearance groove (802) is provided on the vertical surface of the safety shaft (804) corresponding to the safety stop (505). Only in the single-shot state can the safety stop (505) of the single-shot sear (5) be lifted up by the action of the single-shot sear spring (7) and pass over the safety shaft (804). A sear limiting surface (104) is provided on the front wall of the transmitter base (1). A continuous-fire sear limiting surface (4) is provided at the front end of the continuous-fire sear (4). 02), the front end of the single-shot sear (5) is provided with a single-shot sear limiting surface (502), the continuous-shot sear limiting surface (402), the single-shot sear limiting surface (502) cooperate with the sear limiting surface (104) to limit the extreme position of the continuous-shot sear (4) and the single-shot sear (5) to rise. The frame (13) and the continuous-shot sear (4) are respectively provided with continuous-shot sear mounting surfaces (1301, 403), and the frame (13) and the single-shot sear (5) are respectively provided with single-shot sear mounting surfaces (1302, 503). The front of the slider (2) is provided with a protrusion, the top of which is the slider contact surface (206), which is used to limit the continuous firing sear (4). The rear end of the protrusion is the slider slope (207), and the lower part of the slider slope (207) has an opening, which forms a slider (205). The lower end of the single-shot sear (5) is provided with a reset lever (504), the direction of which is opposite to that of the safety stop lever (505). The single-shot sear (5) is in single-shot... In this state, the slider (205) presses on the reset lever (504) of the single-shot sear (5), limiting the position of the single-shot sear (5). The mating surfaces of the slider (205) and the safety lever (505) are inclined surfaces that can guide. After pressing the slider (2) forward, the single-shot sear (5) can rise by relying on the single-shot sear spring (7). When the slider (2) is released and reset, the slider (2) and the slider (205) can press the single-shot sear (5) reset lever (504) to make the single-shot sear (5) sink and reset.

2. The machine gun firing mechanism structure with single-shot / burst firing function according to claim 1, characterized in that: The slider (2) has guide rail protrusions (201) on both sides, and the transmitter base (1) has transmitter base guide rail grooves (101) on both inner walls. The guide rail protrusions (201) are inserted into the transmitter base guide rail grooves (101) to form a sliding fit.

3. The machine gun firing mechanism structure with single-shot / burst firing function according to claim 1, characterized in that: The transmitter base (1) is provided with a transmitter base spring hole (102), and the single-shot sear (5) is provided with a single-shot sear spring hole (501). The two ends of the single-shot sear spring (7) are installed in the transmitter base spring hole (102) and the single-shot sear spring hole (501).

4. The machine gun firing mechanism structure with single-shot / burst firing function according to claim 1, characterized in that: The safety device (8) is equipped with a lever, which is located on the outside of the transmitter.

5. The machine gun firing mechanism structure with single-shot / burst firing function according to claim 1, characterized in that: Both the single-shot sear (5) and the continuous-shot sear (4) have mounting slots. The continuous-shot sear (4) is located in the mounting slot of the single-shot sear (5). The release device (3) is located in the mounting slot of the continuous-shot sear (4), so that the continuous-shot sear limiting surface (402) and the continuous-shot sear mounting surface (403) are located on different vertical surfaces from the single-shot sear limiting surface (502) and the single-shot sear mounting surface (503).

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