Shell punching device

Abstract

The present invention discloses a cartridge case punching device, comprising a punching needle for punching a cartridge case, the punching needle being arranged at the head of a fixing rod, the tail of the fixing rod being inserted into a fuselage and connected to a pressure sensor, the pressure sensor being connected to a control system, and the control system controlling the start and stop of the cartridge case punching device according to the detection data of the pressure sensor. The cartridge case punching device provided by the present invention decomposes the force exerted on the punching needle when punching a cartridge case from the force of feeding and pushing the cartridge case out by directly passing the fixing rod through the fuselage and connecting it to the pressure sensor, the pressure sensor being connected to the control system, and the control system judging whether a needle breakage occurs according to the data detected by the pressure sensor, and if the needle is broken, controlling the cartridge case punching device to stop working, so as to realize the purpose of automatically detecting a needle breakage and automatically stopping processing after the needle breakage is detected.

Description

Technical Field

[0001] The present invention relates to the technical field of special equipment for producing bullets, and more specifically to a cartridge case punching device. Background Art

[0002] The cartridge case is punched with a set of mechanical devices. The whole device is fixed on the machine tool body. The cartridge case is sent into the device by a punch to complete the punching. Since the diameter of the punching needle used for punching is very small, generally the double-fire hole is about 1.2mm, and the single-fire hole is about 2mm. It is installed inside the punching device. During the punching process, the punching needle is easily broken. The service life of the punching needle for punching double-fire holes is about 4000 grains, and the service life of the punching needle for punching single-fire holes is about 6000 grains.

[0003] In the existing equipment, the broken punching needle cannot be discovered immediately. Since the broken punching needle does not affect the normal operation of the machine tool, it can only be discovered when the operator conducts random inspections of the products (generally once every 5 minutes). The production efficiency of the punching processing equipment is 90 grains / minute. Therefore, when the broken needle is discovered, many products without or with few fire holes have often been processed. These products need to be detected and reprocessed, which increases production costs.

[0004] Therefore, how to provide a cartridge case punching device that can automatically detect a broken needle and automatically stop processing after detecting a broken needle is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a cartridge case punching device, which can automatically detect a broken needle and automatically stop processing after detecting a broken needle.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A cartridge case punching device comprises a punching needle for punching cartridge cases, wherein the punching needle is arranged at the head of a fixing rod, the tail of the fixing rod is inserted into a fuselage and connected to a pressure sensor for detecting the pressure at the tail end of the fixing rod, the pressure sensor is connected to a control system, and the control system controls the start and stop of the cartridge case punching device according to the detection data of the pressure sensor; the device also comprises a bullet ejecting device for pushing out the cartridge case, which is arranged on the fuselage and uses the fuselage to provide a reverse thrust, and a bullet feeding device for pushing the cartridge case to the punching needle for punching.

[0008] Preferably, the ejection device includes an ejection cap passing through the punch pin and sleeved on the head of the fixing rod, which is used to push the shell out of the punch pin, and a spring arranged between the ejection cap and the fuselage, which is used to push the ejection cap out of the punch pin.

[0009] Preferably, a sleeve is sleeved on the outer sides of the ejection cap and the spring, and the sleeve is connected to the body.

[0010] Preferably, a stopper for limiting the axial limit elongation of the spring is provided on the inner wall of the sleeve, and a push rod for pushing the ejection cap is passed through the stopper.

[0011] Preferably, a sliding block for pushing the push rod is provided between the push rod and the spring.

[0012] Preferably, a small hole is provided on the end face of the head of the fixing rod, and an upper pressing plate and a lower pressing plate for clamping and fixing the punching needle are provided in the small hole.

[0013] Preferably, the upper pressing plate and the lower pressing plate are fastened by bolts provided on the side wall of the fixing rod head.

[0014] Preferably, a punching needle pad having a harderness greater than that of the fixing rod is provided at the bottom of the small hole.

[0015] Preferably, the fixed rod includes a first transmission rod arranged outside the fuselage, and a second transmission rod arranged inside the fuselage, and the first transmission rod is in contact and connected with the second transmission rod.

[0016] Preferably, a positioning shoulder is provided at the tail of the first transmission rod, and a positioning sleeve for limiting the axial limit displacement of the first transmission rod is provided between the positioning shoulder and the fuselage.

[0017] The cartridge case punching device provided by the present invention comprises a punching needle and a fixing rod for installing the punching needle, the fixing rod passes through the fuselage and is connected to the pressure sensor, and the force point of the ejection device for pushing the punched cartridge case from the punching needle is located on the fuselage, and the fixing rod is directly passed through the fuselage and connected to the pressure sensor, so that the force exerted on the punching needle during the cartridge case punching is decomposed from the force of feeding the cartridge case in and pushing the cartridge case out, and during the process of punching the cartridge case, the fixing rod can transmit the pressure exerted on the punching needle to the pressure sensor, and the force of pushing the cartridge case out or feeding the cartridge case in acts on the fuselage, and the pressure sensor is connected to the control system, and the control system determines whether the needle is broken according to the data detected by the pressure sensor, and if the needle is broken, the control system controls the cartridge case punching device to stop working, so as to realize the purpose of automatically detecting the broken needle and automatically stopping the processing after the broken needle is detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Figure 1 A partial schematic diagram of a specific embodiment of the cartridge case punching device provided by the present invention;

[0020] Figure 2 It is a schematic diagram of a specific embodiment of the cartridge case punching device provided by the present invention.

[0021] Among them, 1-feeding device, 2-cartridge case, 3-upper pressure plate, 4-lower pressure plate, 5-elevator, 6-slider, 7-spring, 8-positioning sleeve, 9-fixing rod, 10-spring pressure cover, 11-punch pin, 12-retracting cap, 13-sleeve, 14-punch pin pad, 15-block, 16-second transmission rod, 17-first transmission rod, 18-pressure sensor, 19-fuselage, 20-connecting sleeve, 21-pressure sensor connecting seat, 22-control system. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The core of the present invention is to provide a cartridge case punching device, which can automatically detect a broken needle and automatically stop processing after detecting the broken needle.

[0024] Please refer to Figure 1 to Figure 2 , Figure 1 A partial schematic diagram of a specific embodiment of the cartridge case punching device provided by the present invention; Figure 2 It is a schematic diagram of a specific embodiment of the cartridge case punching device provided by the present invention.

[0025] The cartridge case punching device provided by the present invention comprises a punching needle 11 for punching a cartridge case 2, the punching needle 11 being arranged at the head of a fixing rod 9, the tail of the fixing rod 9 being inserted into a fuselage 19 and connected to a pressure sensor 18, the pressure sensor 18 being connected to a control system 22, the control system 22 controlling the start and stop of the cartridge case punching device according to the detection data of the pressure sensor 18; it also comprises a bullet ejecting device for pushing out the cartridge case 2 by using the fuselage 19 to provide a reverse thrust, and a bullet feeding device 1 for pushing the cartridge case 2 to the punching needle 11 for punching.

[0026] Among them, the main function of the punching needle 11 is that when the bullet feeding device 1 pushes the cartridge case 2 to the punching needle 11 and applies thrust to the punching needle 11, the cartridge case 2 product is punched by the punching needle 11. The punching needle 11 can be arranged on the head end face of the fixing rod 9 used to fix the punching needle 11. The tail end of the fixing rod 9 needs to be inserted into the fuselage 19 and directly connected to the pressure sensor 18 arranged on the fuselage 19, so that the punching force received by the punching needle 11 during the punching process can be directly transmitted to the pressure sensor 18 through the fixing rod 9.

[0027] The ejection device for ejecting the punched cartridge case 2 from the punching pin 11 acts on the fuselage 19 and utilizes the reverse thrust provided by the fuselage 19 to eject the cartridge case 2 from the punching pin 11 .

[0028] Since the impact force exerted on the punching needle 11 when punching the cartridge case 2 is significantly different from the impact force exerted on the punching needle 11 after the needle breaks, when the needle breaks, the pressure exerted on the pressure sensor 18 by the fixing rod 9 will change significantly. The pressure sensor 18 will detect the pressure change and transmit it to the control system 22. The control system 22 can determine the needle breakage according to the change in the impact force exerted on the punching needle 11, and then control the cartridge case punching device to stop working, so as to avoid continuing to produce defective cartridge cases 2 with no holes or few holes when the needle breaks.

[0029] The pressure sensor 18 is connected to the control system 22. The control system 22 can determine whether a needle breakage occurs according to the pressure value detected by the pressure sensor 18. If the determination result is yes, the control system 22 can control the cartridge case punching device to stop running.

[0030] There are many options for the control principle to achieve the above purpose. Preferably, 100 groups of maximum pressure values ​​during normal processing when the punch needle 11 is not broken are collected, and the smallest pressure value is taken as the upper limit base number. Then 100 groups of maximum pressure values ​​when one of the punch needles 11 is damaged (double fire transmission holes) are collected, and the largest pressure value is taken as the lower limit base number. A value between the upper limit base number and the lower limit base number (determined by experiment) is set as the standard value of the system, and the maximum pressure value delivered by the pressure sensor 18 in each punching processing cycle is compared with the standard value of the system. When the maximum pressure value is lower than the set standard value, the system considers that the punch needle 11 is damaged. At this time, the system outputs a stop signal to the machine tool, and the machine tool stops and an alarm is prompted at the same time.

[0031] The cartridge case punching device provided by the present invention has a punching needle 11 disposed on a fixing rod 9, the fixing rod 9 is inserted on a fuselage 19, and the fixing rod 9 is directly connected to a pressure sensor 18 disposed on the fuselage 19, so that the force exerted on the punching needle 11 during the punching process can be directly transmitted to the pressure sensor 18 through the fixing rod 9, and the ejection device that pushes the punched cartridge case 2 out of the punching needle 11 is subjected to force from the fuselage 19. Therefore, the cartridge case punching device provided by the present invention can decompose the impact force exerted on the punching needle 11, that is, the impact force exerted on the punching needle 11 during punching can act on the pressure sensor 18 alone without being interfered by other forces. Since the impact force on the punching needle 11 will change significantly when the needle breaks, the pressure sensor 18 can transmit the detected pressure change to the control system 22 when the needle breaks. The control system 22 can determine the occurrence of the needle breakage based on the pressure change on the punching needle 11, and then control the cartridge case punching device to stop working, so as to avoid continuing to produce defective cartridge cases 2 with no holes or few holes in the case of needle breakage, thereby effectively improving production efficiency and reducing production costs.

[0032] On the basis of the above embodiment, the ejection device includes an ejection cap 12 which passes through the punch pin 11 and is sleeved on the head of the fixing rod 9 and is used to push the cartridge case 2 from the punch pin 11, and a spring 7 which is arranged between the ejection cap 12 and the fuselage 19 and is used to push the ejection cap 12 from the punch pin 11.

[0033] The main function of the ejection device is to push the punched cartridge case 2 out of the punch pin 11 so that the punch pin 11 can punch the next cartridge case 2. There are many options for the structural setting of the ejection device. For example, the ejection device may include an ejection cap 12 sleeved on the head of the fixing rod 9 and a spring 7 arranged between the ejection cap 12 and the fuselage 19. When the feeding device 1 does not push the cartridge case 2, the ejection cap 12 should extend out of the punch pin 11 under the action of the spring 7 to ensure that the ejection cap 12 can push the cartridge case 2 out of the punch pin 11 after the punching of the cartridge case 2 is completed. When the feeding device 1 pushes the cartridge case 2 to the punch pin 11, the ejection cap 12 should be pushed by the cartridge case 2 to move in the compression direction of the spring 7, so that the punch pin 11 extends relative to the ejection cap 12 to punch the cartridge case 2. Therefore, the end face of the ejection cap 12 should be provided with a small hole structure that allows the punch pin 11 to extend, and the width of the small hole should be smaller than the width of the end face of the cartridge case 2.

[0034] The main function of the spring 7 is that each time the punching needle 11 completes punching and the bullet feeding device 1 leaves the ejection cap 12, the spring 7 will naturally extend after losing the external force in the compressed state, and push the ejection cap 12 out of the punching needle 11, so as to push out the cartridge case 2 on the punching needle 11. Since the cartridge case punching device provided by the present invention needs to separate the force of the punching needle 11 from the ejection force and act on the pressure sensor 18, the force point of the spring 7 should be set on the fuselage 19.

[0035] There are many options for setting the spring 7. Preferably, a spring 7 with a larger inner diameter is sleeved on the outer wall of the fixed rod 9. One end of the spring 7 is used to push the ejection cap 12, and the other end acts on the fuselage 19 to provide a reverse thrust. It should be pointed out that the inner diameter of the spring 7 should be larger than the outer diameter of the fixed rod 9 to ensure that the spring 7 does not generate a large friction with the fixed rod 9 during the extension and retraction process.

[0036] On the basis of the above embodiments, considering that the ejection cap 12 and the spring 7 will be continuously compressed or elongated during operation, that is, the ejection cap 12 and the spring 7 will continuously move relative to the fixing rod 9, in order to ensure the safety and reliability of the movement environment of the ejection cap 12 and the spring 7 relative to the fixing rod 9, a sleeve 13 may be sleeved on the outside of the ejection cap 12 and the spring 7 to prevent dust or debris from being stuck in the spring 7, so as to ensure the normal operation of the spring 7.

[0037] It should be pointed out that the inner diameter of the sleeve 13 may be slightly larger than the outer diameter of the ejection cap 12 so as not to affect the normal working of the ejection cap 12 .

[0038] On the basis of the above embodiment, a stopper 15 for limiting the axial limit elongation of the spring 7 is provided on the inner wall of the sleeve 13 , and a push rod 5 for pushing the ejection cap 12 is passed through the stopper 15 .

[0039] In order to prevent the ejection cap 12 from being pushed away from the fixing rod 9 under the action of the elastic force of the spring 7, a stopper 15 for limiting the maximum distance that the spring 7 can pop out can be provided on the inner wall of the sleeve 13. Preferably, the stopper 15 can be an annular stopper 15, the inner diameter of the stopper 15 should be slightly larger than the outer diameter of the fixing rod 9, the push rod 5 should be axially penetrated on the stopper 15, and the push rod 5 can move relative to the stopper 15.

[0040] During operation, when the ejection cap 12 moves in the direction of compression of the spring 7 under the push of the bullet feeding device 1, the ejection cap 12 can push the push rod 5 to move inward and compress the spring 7; when the punching is completed, the bullet feeding device 1 leaves the ejection cap 12, and the ejection cap 12 loses its thrust, then the push rod 5 moves outward under the action of the elastic force of the spring 7 and pushes the ejection cap 12 to move outward, so that the ejection cap 12 pushes out the cartridge case 2 on the punch pin 11, and when the spring 7 extends to the position of the stop block 15, the stop block 15 can prevent the spring 7 from continuing to extend, thereby ensuring that the ejection cap 12 will not continue to extend outward and detach from the fixing rod 9.

[0041] It should be noted that the stopper 15 should maintain a certain distance from the ejector cap 12, so that when the ejector cap 12 is pushed by the delivery device in the direction of compression of the spring 7, the ejector cap 12 should be pushed to a position where the punch pin 11 can be extended relative to the ejector cap 12. It should be understood that under the action of the elastic force of the spring 7, the ejector rod 5 should be extended to a length that enables the ejector cap 12 to push the cartridge case 2 on the punch pin 11 away from the punch pin 11.

[0042] There are many options for the number of push rods 5 . Preferably, two push rods 5 are passed through the stopper 15 , and the two push rods 5 are symmetrically arranged along the axis of the fixing rod 9 .

[0043] On the basis of the above embodiment, considering that the diameter of the push rod 5 is relatively small, in order to improve the reliability of the cooperation between the push rod 5 and the spring 7, a slider 6 for pushing the push rod 5 can be provided between the push rod 5 and the spring 7. Preferably, the slider 6 is a circular slider 6, and the slider 6 can be sleeved on the outer wall of the fixed rod 9, and the inner diameter of the slider 6 should be slightly larger than the outer diameter of the fixed rod 9, and the outer diameter of the slider 6 should be slightly smaller than the inner diameter of the sleeve 13.

[0044] In order to facilitate the installation of the sleeve 13 and the spring 7, a spring pressure cover 10 can be further arranged between the sleeve 13 and the fuselage 19. The spring pressure cover 10 can be sleeved on the fixing rod 9 and connected to the fuselage 19. The sleeve 13 can be connected to the side wall of the spring pressure cover 10 by screws, and the end face of the spring pressure cover 10 can be provided with an annular step surface for the spring 7 to be inserted.

[0045] On the basis of the above-mentioned embodiment, a small hole is provided on the end face of the head of the fixing rod 9 , and an upper pressing plate 3 and a lower pressing plate 4 for fixing the punching needle 11 are provided in the small hole.

[0046] Considering the way the punch needle 11 is set on the head of the fixing rod 9, a small hole can be set on the end face of the head of the fixing rod 9, and an upper pressure plate 3 and a lower pressure plate 4 for fixing the punch needle 11 can be set in the small hole. In order to facilitate the installation and fixation of the punch needle 11, a recess for installing the punch needle 11 can be set on the end faces of the upper pressure plate 3 and the lower pressure plate 4 that contact the punch needle 11 to avoid slipping of the punch needle 11 during operation.

[0047] It should be pointed out that for the structure of double punches 11, a third pressure plate can be set between the upper pressure plate 3 and the lower pressure plate 4. Of course, two parallel punches 11 can also be set between the two pressure plates. Correspondingly, two groups of recessed positions corresponding to the installation of the punches 11 can be set on the end surface of the pressure plate contacting the punches 11.

[0048] On the basis of the above embodiments, considering the fixing method of the upper pressure plate 3 and the lower pressure plate 4 to the punch needle 11, the upper pressure plate 3 and the lower pressure plate 4 can be fastened by bolts arranged on the side wall of the head of the fixing rod 9. When the punch needle 11 is inserted into the gap between the upper pressure plate 3 and the lower pressure plate 4, the upper pressure plate 3 and the lower pressure plate 4 can be tightened and fixed by tightening the bolts arranged on the side wall of the fixing rod 9.

[0049] On the basis of the above embodiment, considering that the punching needle 11 is subjected to a large impact force during the punching process, a punching needle pad 14 with a higher hardness may be provided at the bottom of the small hole. Preferably, the punching needle pad 14 may be made of high-speed steel.

[0050] In this embodiment, a punching needle pad 14 is provided between the punching needle 11 and the fixing rod 9. The punching needle pad 14 is made of high-speed steel with relatively high hardness, which can prevent the punching needle 11 from impacting and wearing the fixing rod 9. Therefore, the fixing rod 9 can be made of relatively low-priced No. 45 steel, thereby reducing the production cost of the device.

[0051] On the basis of any of the above-mentioned embodiments, considering that the tail end of the fixing rod 9 needs to be connected to the pressure sensor 18 with higher precision, frequent disassembly and assembly of the connection relationship between the fixing rod 9 and the pressure sensor 18 is not conducive to the detection accuracy of the pressure sensor 18. In order to facilitate the installation and disassembly of the fixing rod 9 and the parts mounted on the fixing rod 9, the fixing rod 9 may include a first transmission rod 17 arranged outside the fuselage 19 and a second transmission rod 16 arranged inside the fuselage 19.

[0052] In this embodiment, the fixing rod 9 includes a first transmission rod 17 disposed outside the fuselage 19 and a second transmission rod 16 disposed inside the fuselage 19. The second transmission rod 16 disposed inside the fuselage 19 is connected to the pressure sensor 18, and the first transmission rod 17 disposed outside the fuselage 19 is directly in contact with or connected to the second transmission rod 16. Therefore, the first transmission rod 17 can directly transmit the impact force received by the punching needle 11 during punching to the second transmission rod 16, and then to the pressure sensor 18. When installing or replacing parts, it is only necessary to remove the first transmission rod 17 disposed outside the fuselage 19, which can avoid affecting the detection accuracy of the pressure sensor 18 and improve the convenience of disassembly and assembly.

[0053] In order to facilitate the installation of the pressure sensor 18, a connecting sleeve 20 for installing the pressure sensor connecting socket 21 may be provided at the rear of the fuselage 19. Preferably, the connecting sleeve 20 and the fuselage 19 may be connected by bolts.

[0054] It should be understood that the second transmission rod 16 should simultaneously pass through the fuselage 19 and the connecting sleeve 20 to act on the pressure sensor connecting seat 21. When the second transmission rod 16 is subjected to the pressure of the first transmission rod 17, the pressure can be directly transmitted to the pressure sensor connecting seat 21, thereby causing it to deform. The pressure sensor 18 fastened to the pressure sensor connecting seat 21 will receive the changes and output data. The data changes with the change of the force applied to the punch pin 11, thereby enabling real-time monitoring of the force applied to the punch pin 11.

[0055] On the basis of the above embodiment, a positioning shoulder is provided at the tail of the first transmission rod 17 , and a positioning sleeve 8 for limiting the axial limit displacement of the first transmission rod 17 is provided between the positioning shoulder and the fuselage 19 .

[0056] Since the second transmission rod 16 is connected to the pressure sensor 18, in order to prevent the first transmission rod 17 from applying too much thrust to the second transmission rod 16 and causing damage to the pressure sensor 18, a positioning sleeve 8 for limiting the ultimate axial displacement of the first transmission rod 17 can be provided between the first transmission rod 17 and the fuselage 19. Preferably, a positioning shoulder can be provided at the tail of the first transmission rod 17 so that the diameter of the tail end of the first transmission rod 17 is smaller than the diameter of the middle of the first transmission rod 17. Then, the positioning sleeve 8 can be sleeved on the tail end of the first transmission rod 17. The inner diameter of the positioning sleeve 8 should be slightly larger than the inner diameter of the annular step surface and smaller than the outer diameter of the annular step surface, and the outer diameter of the positioning sleeve 8 should be larger than the outer diameter of the second transmission rod 16 and the annular step surface, so as to ensure that when the positioning sleeve 8 moves excessively from the first transmission rod 17 to the second transmission rod 16, the positioning sleeve 8 can block the first transmission rod 17 to avoid causing damage to the pressure sensor 18. Preferably, the maximum gap between the annular step surface and the positioning sleeve 8 is 0.5 mm.

[0057] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0058] The above is a detailed introduction to the cartridge case punching device provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A cartridge case punching device, characterized in that: The invention comprises a punching needle (11) for punching a cartridge case, the punching needle (11) being arranged at the head of a fixing rod (9), the tail of the fixing rod (9) being inserted into a fuselage (19) and connected to a pressure sensor (18) for detecting the pressure at the tail end of the fixing rod (9), the pressure sensor (18) being connected to a control system (22), the control system (22) controlling the start and stop of the cartridge case punching device according to the detection data of the pressure sensor (18); and also comprising a bullet ejecting device arranged at the fuselage (19) and using the fuselage (19) to provide a reverse thrust and for ejecting the cartridge case, and a bullet feeding device (1) for pushing the cartridge case to the punching needle (11) for punching a hole. The ejection device comprises an ejection cap (12) passing through the punch pin (11) and sleeved on the head of the fixing rod (9) for ejecting the cartridge case from the punch pin (11), and a spring (7) disposed between the ejection cap (12) and the fuselage (19) for ejecting the ejection cap (12) from the punch pin (11); A sleeve (13) is also sleeved on the outer sides of the ejection cap (12) and the spring (7), and the sleeve (13) is connected to the body (19); A spring pressure cover (10) is provided between the sleeve (13) and the body (19); the spring pressure cover (10) is sleeved on the fixing rod (9) and connected to the body (19); the sleeve (13) is connected to the side wall of the spring pressure cover (10) by screws; and the end surface of the spring pressure cover (10) is provided with an annular step surface for the spring (7) to be sleeved. The fixing rod (9) comprises a first transmission rod (17) arranged outside the fuselage (19), and a second transmission rod (16) arranged inside the fuselage (19), the first transmission rod (17) being in contact and connected with the second transmission rod (16), and the second transmission rod (16) being connected with the pressure sensor (18); A stopper (15) for limiting the axial limit elongation of the spring (7) is provided on the inner wall of the sleeve (13), and a push rod (5) for pushing the ejection cap (12) is passed through the stopper (15).

2. The cartridge case punching device according to claim 1, characterized in that: A sliding block (6) for pushing the push rod (5) is provided between the push rod (5) and the spring (7).

3. The cartridge case punching device according to claim 1, characterized in that: A small hole is provided on the end face of the head of the fixing rod (9), and an upper pressing plate (3) and a lower pressing plate (4) for clamping and fixing the punching needle (11) are provided in the small hole.

4. The cartridge case punching device according to claim 3, characterized in that: The upper pressing plate (3) and the lower pressing plate (4) are fastened by bolts provided on the side wall of the head of the fixing rod (9).

5. The cartridge case punching device according to claim 4, characterized in that: A punching needle cushion (14) having a harderness than that of the fixing rod (9) is provided at the bottom of the small hole.

6. The cartridge case punching device according to any one of claims 1 to 5, characterized in that: A positioning shoulder is provided at the tail of the first transmission rod (17), and a positioning sleeve (8) for limiting the axial limit displacement of the first transmission rod (17) is provided between the positioning shoulder and the fuselage (19).

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