A press fitting device for a fire extinguisher nozzle

Abstract

The utility model provides a fire extinguisher nozzle crimping device belongs to the post processing technical field of formed product, it mainly includes installation platform, linear motion mechanism, wedge sleeve type power chuck and travel switch. Linear motion mechanism is connected with installation platform and wedge sleeve type power chuck respectively. Power chuck is fixedly connected with installation platform, and the claw moves along the radial, and its inboard side is equipped with nozzle positioning structure. Nozzle positioning structure is also fixedly connected with installation platform, and the detection end of travel switch is installed on its axial rear side. The utility model structure is simple, and the cost is low, and through relative position fixed, and the nozzle positioning structure of adaptation nozzle, and wedge sleeve type power chuck and travel switch cooperation, can effectively guarantee in the scene of automatic or manual feeding, can only start the device after placing the nozzle to accurate position, and power chuck can realize even pressing, and then promote the crimping precision, to guarantee the butt joint depth and concentricity, can also promote the consistency of junction, enhance the reliability.

Description

Technical Field

[0001] This utility model belongs to the field of finished product post-processing technology, specifically relating to a fire extinguisher nozzle crimping device. Background Technology

[0002] In the field of fire protection equipment, the connection between the nozzle and hose of a fire extinguisher is a key link to ensure the reliability of the fire extinguishing system. In the existing technology, the press-fit connection process is generally used to connect the nozzle and hose.

[0003] The press-fit connection process needs to be adapted to the current mechanical connection design of the nozzle and hose. Common fire extinguisher nozzles employ a one-piece molded structure with a flared main body to guide the extinguishing agent spray direction. A cylindrical connector extends from its tail, and the connector's outer circumference is typically designed with an annular groove or a rough surface to improve the stability of the connection with the hose. The hose is made of weather-resistant and pressure-resistant rubber, and some products have an embedded fiber reinforcement layer. The pre-installed metal compression ring at the end is mostly made of low-carbon steel or stainless steel, leveraging its good plasticity to meet subsequent deformation and consolidation requirements.

[0004] In the specific pressing operation process, it is generally necessary to rely on specialized pressing equipment. Traditional equipment is equipped with positioning fixtures and radial pressure mechanisms. The specific operation is as follows: The first step is nozzle positioning. With the flared end of the nozzle facing the inside of the equipment and the connecting joint facing outward, it is fitted onto the central shaft of the pressing equipment. The nozzle is axially fixed by tooling fixtures to ensure that it does not shift during the pressing process. The second step is to pre-install the hose. The hose is held manually, and its end is aligned with the nozzle connector and inserted. At this time, it is necessary to ensure that the hose completely covers the effective connection length of the connector, and the pre-installed metal compression ring is exactly on the outside of the joint between the connector and the hose. The third step is compression and consolidation. After the equipment is started, the radial pressure mechanism applies uniform radial pressure to the metal compression ring, forcing the compression ring to undergo plastic deformation and tightly clamp onto the joint between the hose and the connector. Through mechanical interlocking, the two are consolidated, completing the entire connection process.

[0005] The above-mentioned traditional processes are widely used due to their advantages such as simple operation and low equipment cost; however, there are some serious problems in actual production and use, as follows: 1. The lack of precise positioning benchmarks in the manual insertion process makes it difficult to ensure the consistency of the mating depth between the hose and the nozzle connector. In some cases, the hose may be inserted too shallowly, resulting in insufficient effective bonding area. At the same time, the randomness of manual operation can easily cause coaxiality deviation between the two, resulting in uneven deformation of the metal pressing ring and the formation of local stress concentration. This not only reduces the connection strength but may also cause eccentric wear of the hose under stress, shortening its service life.

[0006] 2. Radial compression has limitations in its force application method. The externally applied radial pressure is a multi-point or ring-shaped concentrated force. During the plastic deformation process, the metal compression ring will generate internal stress. After compression, slight elastic recovery is likely to occur, leading to a decrease in the fit between the compression ring and the hose / connector, and the actual compression force does not meet the design requirements. This hidden danger will gradually appear during long-term use. With the handling of the fire extinguisher, vibration, or high-pressure spraying of the extinguishing agent, micro-gaps may appear on the sealing surface, causing extinguishing agent leakage, directly affecting the fire extinguishing effect, and even posing a safety risk in emergency situations.

[0007] Furthermore, the equipment used in traditional processes is highly dependent on the skill level of the operators. Differences in the insertion force and angle among different workers can further amplify the variability in product quality, increasing the difficulty and cost of subsequent quality inspection. For high-pressure fire extinguishers or fire extinguishers used in special environments (such as low-temperature or corrosive environments), the mechanical connection reliability generated by the above-mentioned equipment and processes is difficult to meet the stringent usage requirements. The sealing performance and structural stability of the joints become key factors restricting the improvement of product performance.

[0008] In summary, existing press-fit connection devices for fire extinguisher nozzles and hoses still have problems with precise control of the mating depth and coaxiality, as well as elastic recovery after radial compression, which makes it impossible to guarantee the consistency of the connection, long-term sealing performance, and structural reliability. Summary of the Invention

[0009] This invention addresses the problems existing in the prior art by providing a fire extinguisher nozzle crimping device that can achieve precise positioning, uniform pressure application, and suppress deformation and rebound, thereby solving the aforementioned problems.

[0010] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a fire extinguisher nozzle crimping device, including a mounting platform, a linear motion mechanism, a wedge-type power chuck, and a limit switch; The fixed end of the linear motion mechanism is fixedly connected to the mounting platform, and the movable end is fixedly connected to the wedge-shaped sleeve of the wedge-type power chuck; the power chuck of the wedge-type power chuck is directly or indirectly fixedly connected to the mounting platform; the jaws of the wedge-type power chuck move radially, and the jaw ends slide in engagement with the wedge-shaped sleeve. The inner side of the wedge-type power chuck is also provided with a nozzle positioning structure; the nozzle positioning structure is directly or indirectly fixedly connected to the mounting platform, and the nozzle positioning structure is adapted to the fire extinguisher nozzle; the detection end of the limit switch is installed on the axial rear side of the nozzle positioning structure; the limit switch is electrically connected to the control unit of the linear motion mechanism, and is at least used to control the start of the linear motion mechanism.

[0011] Furthermore, the linear motion mechanism is a guide rod cylinder, including a guide rod, a cylinder body, and a piston rod; the guide rod cylinder is externally connected to a drive air source via a pipeline; The mounting platform is also equipped with a vertical adapter; The end of the piston rod is fixedly connected to the adapter seat; The guide rod passes through the guide rod cylinder and is fixedly connected to the adapter; the front end of the guide rod is fixedly connected coaxially to the power chuck. The cylinder body and the wedge-shaped sleeve are coaxially and fixedly connected.

[0012] Furthermore, the limit switch is an inductive switch, including a proximity sensor, a travel linkage, and a movable baffle; The guide rod has a hollow structure; the stroke connecting rod is nested in the guide rod and slides with the guide rod; One end of the stroke link is fixed with the movable baffle, which is a detection end located on the axial rear side of the nozzle positioning structure; the proximity sensor is installed on the side of the other end of the stroke link; an elastic reset mechanism is provided between the stroke link and the guide rod or the adapter. The travel linkage is provided with a detection position for triggering the detection signal of the proximity sensor; The signal output terminal of the proximity sensor is connected to the control unit of the driving air source.

[0013] Furthermore, the guide rod is provided with a cavity, and a connecting plate is provided inside the cavity; One side of the connecting plate is fixedly connected to the stroke connecting rod, and the other side is provided with multiple sliding rods; the end face of the cavity is provided with multiple through holes, and a sliding rod is installed in each through hole; the end of the sliding rod is fixedly connected to the movable baffle. The end of the guide rod passes through the movable baffle and is fixedly connected to the nozzle positioning structure.

[0014] Furthermore, a support plate is installed on one side of the adapter, and a folded edge is provided at the tail of the support plate, with a mounting through hole machined on the folded edge; The end of the travel link is slidably connected to the mounting through hole; The elastic reset mechanism includes a retaining ring and a reset spring; The retaining ring is fixed on the travel link, and the return spring is located between the retaining ring and the folded edge of the support plate.

[0015] Furthermore, the pallet is provided with a flap on its side; The flip plate is machined with an elongated hole, and the proximity sensor is installed at the elongated hole; The detection end of the proximity sensor faces the travel link, and the retaining ring is the detection position of the travel link.

[0016] Furthermore, the linear motion mechanism is provided with a position detection unit on its side; The position detection unit is fixedly connected to the mounting platform via an adapter.

[0017] Furthermore, the position detection unit is equipped with two proximity sensors; The mounting platform is provided with a mounting baffle on its side, and the mounting baffle is provided with an elongated hole, and the proximity sensor is installed at the elongated hole; The two proximity sensors correspond to the initial position and the working position located at the moving end of the linear motion mechanism, respectively.

[0018] Furthermore, when the fire extinguisher nozzle crimping device is used for manual feeding and pressing, it also includes a safety device; the safety device is equipped with a power supply, a current generator, a current sensor, a controller, and an insulating baffle. The power supply is connected to the current generator, and the current generator is connected to the power chuck through a detection circuit; the current sensor is connected in series on the detection circuit. The current sensor is used to collect the current change of the detection circuit, and the current sensor signal output terminal is connected to the controller. The output of the controller is connected to the control unit of the driving air source; The insulating baffle has a ring structure and is installed on the front side of the power chuck.

[0019] Furthermore, it also includes a thrust mechanism; the thrust mechanism is provided with a rotary stop bar, a counterweight, a stop bar switch, a stop pin, and a preload spring; The stop pin is installed on the movable end of the linear motion mechanism; The middle part of the rotary stop bar is rotatably connected to the mounting platform; the movement trajectory of one end of the rotary stop bar intersects with the movement trajectory of the stop pin, and the counterweight is installed at the other end; The stop switch is installed on the mounting platform to release the rotation stop in a horizontal position; the stop switch is electrically connected to the controller. The pre-tension spring is installed between the slewing stop and the mounting platform; when the slewing stop is in the stop switch locked position, the tension applied by the pre-tension spring to the slewing stop is at its maximum.

[0020] Compared with the prior art, the present invention has the following beneficial effects: This utility model has a simple structure and low cost. Through the nozzle positioning structure with a fixed relative position and adapted to the nozzle, and the cooperation of the wedge-type power chuck and limit switch, it can effectively ensure that in automatic or manual feeding scenarios, the device will only be activated after the nozzle is placed in the accurate position. Furthermore, the power chuck can achieve uniform pressing, thereby improving the pressing accuracy and ensuring the docking depth and coaxiality. At the same time, it can also improve the consistency of the connection and enhance reliability. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a perspective view of the front side of the device in a specific embodiment of this utility model; Figure 2 This is a perspective view of the rear side of the device in a specific embodiment of this utility model; Figure 3 This is a schematic diagram of the claw distribution in a specific embodiment of the present invention; Figure 4 This is a schematic diagram of the claw pressing operation in a specific embodiment of this utility model; Figure 5 This is a simplified diagram of the internal structure of the device in a specific embodiment of this utility model; Figure 6 This is a perspective view of the nozzle positioning structure in a specific embodiment of the present invention; Figure 7 This is a partial sectional perspective view of the assembly position of the guide rod and the stroke connecting rod in a specific embodiment of this utility model; Figure 8 This is a perspective view of the thrust mechanism in a specific embodiment of the present invention.

[0023] In the diagram: 1. Mounting platform, 2. Adapter seat, 201. Mounting baffle, 3. Guide rod cylinder, 301. Cylinder body, 302. Connecting plate, 303. Sealing end cap, 304. Guide rod, 305. Piston, 306. Piston rod, 307. Cylindrical structure, 4. Wedge sleeve power chuck, 401. Wedge sleeve, 402. Claw, 5. Limit switch, 501. Stroke connecting rod, 502. First proximity sensor, 503. Movable baffle, 504. Nozzle positioning structure, 505. Connecting plate, 506. Slide rod, 507. Return spring, 508. Retaining ring, 509. Corrugated dust cover, 6. Second proximity sensor, 7. Insulating baffle, 8. Thrust mechanism, 801. Stop pin, 802. Rotary stop rod, 803. Counterweight, 804. Pre-tension spring, 805. Stop switch. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of this utility model, it should be understood that the relative relationships indicated by terms such as "upper", "lower", "front", and "rear" are based on the order of contact with the material in the rotation direction in actual application, and are used for the convenience of describing this utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific position, and therefore should not be construed as a limitation of this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] It should also be noted that, unless otherwise specified, the methods used in this utility model are conventional methods; and the raw materials and equipment used are, unless otherwise specified, conventional commercially available products.

[0030] like Figures 1-7 As shown, this application provides a fire extinguisher nozzle crimping device, which includes a mounting platform 1, a linear motion mechanism, a wedge-type power chuck 4, and a limit switch 5.

[0031] The mounting platform 1 serves as the base for the device and adopts an independent structure to facilitate subsequent movement and rapid deployment. The mounting platform 1 has a horizontally placed, flat, box-shaped structure, and a metal counterweight is fixed inside to balance the center of gravity of the device. A vertical adapter 2 is also installed on the rear side of the mounting platform 1. As the main support structure, it adopts a square box structure and is made of high-strength aluminum alloy.

[0032] The fixed end of the linear motion mechanism is fixedly connected to the mounting platform 1, and the movable end is fixedly connected to the wedge-shaped sleeve 401 of the wedge-type power chuck 4. The linear motion mechanism can specifically adopt an electric drive mechanism or a pneumatic mechanism. Electric drive mechanisms have advantages such as rapid response and low operating costs, but they also have the problem of difficulty in balancing pressing force and action time, and a high failure rate during long-term use. Therefore, this embodiment specifically adopts a pneumatic mechanism. Thus, the linear motion mechanism in this embodiment is a guide rod cylinder 3, including a guide rod 304, a cylinder body 301, and a piston rod 306. The guide rod cylinder 3 is externally connected to a drive air source through a pipeline. Specifically, combined with... Figures 5-7As shown, the end of the piston rod 306 is fixedly connected to the adapter seat 2 via the connecting plate 302, making the guide rod cylinder 3 horizontal overall. The cylinder body 301 is the actuating structure, with a connector for connecting to an external drive air source, and a sealing end cap 303 installed at the end; the interior of the cylinder body 301 is a cylindrical cavity structure, divided into two chambers by the piston 305, and the two chambers are filled or discharged with compressed air through corresponding connectors. The guide rod 304 is a hollow shaft structure that passes through the guide rod cylinder 3 and is nested in the piston rod 306. The guide rod 304 is also fixedly connected to the adapter seat 2 and serves as an adapter structure, fixing the mounting platform 1 and related accessories, while also providing additional support for the guide rod cylinder 3. The front end of the guide rod 304 is coaxially fixedly connected to the power chuck; specifically, a sleeve is coaxially fixed to the guide rod 304, and the power chuck is fixedly connected to the sleeve. The cylinder body 301 is coaxially and fixedly connected to the wedge sleeve 401. The wedge sleeve 401 has a cylindrical structure with a wedge-shaped part inside, specifically an annular slope structure. In this embodiment, the wedge-type power chuck 4 has eight jaws 402 slidably connected radially on its power chuck. Inside the power chuck... Figure 3 As shown, the eight jaws 402 are evenly distributed circumferentially, with arc-shaped ends. When the wedge-shaped sleeve 401 moves axially with the cylinder body 301 (as shown in the image), the jaws 402 are positioned such that when the sleeve moves axially with the cylinder body 301, the jaws 402 are positioned as the sleeve ... Figure 8 (As shown by the thick arrow), its wedge-shaped part slides into the top of the jaw 402, pressing the eight jaws 402 to move radially inward (as shown by the arrow). Figure 8 (As indicated by the thin arrow), thus applying pressure to the workpiece at the crimping position to complete the crimping operation. After one crimping operation is completed, the wedge sleeve 401 retracts with the cylinder 301, and the eight jaws 402 reset under the action of the spring, presenting a neutral position. Figure 3 The state is in the middle of the unfolded state.

[0033] The inner side of the wedge-type power chuck 4 is also provided with a nozzle positioning structure 504, which is as follows: Figure 6 As shown, the lower part is a frustum structure, and the top is equipped with a pin structure. In this embodiment, the nozzle positioning structure 504 is adapted to the flared shape of the fire extinguisher nozzle, and the pin structure can be inserted into the rear of the nozzle. When the nozzle positioning structure 504 is fully engaged with the fire extinguisher nozzle, it ensures coaxiality and insertion depth requirements. The nozzle positioning structure 504 is directly or indirectly fixedly connected to the mounting platform. Therefore, in this embodiment, the nozzle positioning structure 504 is designed to be coaxially fixedly connected to the aforementioned guide rod 304, thereby ensuring its position relative to the mounting platform 1 is fixed. This facilitates the operator or automated feeding equipment to provide sufficient insertion force to ensure the fire extinguisher nozzle is properly inserted.

[0034] The detection end of the limit switch 5 is installed on the axial rear side of the nozzle positioning structure 504. Specifically, in this embodiment, the limit switch 5 is an inductive switch, including a first proximity sensor 502, a travel linkage 501, and a movable baffle 503. Since the guide rod 304 is a hollow structure, the travel linkage 501 is nested within the guide rod 304 and slides within it. One end of the travel linkage 501 is fixed to the movable baffle 503, which serves as the detection end of the limit switch 5. Located on the axial rear side of the nozzle positioning structure 504, the movable baffle 503 can only be effectively displaced when the fire extinguisher nozzle is inserted into position. The first proximity sensor 502 is installed on the side of the other end of the travel linkage 501, and an elastic reset mechanism is provided between the travel linkage 501 and the guide rod 304 or the adapter 2. Further, as... Figure 7As shown, to achieve the above functions, a cavity is provided at the front side of the guide rod 304. The outer side of the cavity is a cylindrical structure 307, consisting of a cylinder body and a cylinder cover. The cylinder cover is welded and fixed to the middle and rear section of the guide rod 304, and the cylinder body is welded and fixed to the front section of the guide rod 304. A connecting plate 505 is provided inside the cavity, which is fixedly connected to the through-stroke connecting rod 501. Multiple sliding rods 506 are provided on the other side of the connecting plate 505, and multiple through holes are machined on the end face of the cavity, with one sliding rod 506 installed in each through hole. The end of the sliding rod 506 is exposed and fixedly connected to a movable baffle 503. The movable baffle 503 is an annular structure with a gap in the middle through which the guide rod 304 passes, allowing it to be directly fixed to the nozzle positioning structure 504. Furthermore, the travel link 501 is equipped with a detection position for triggering the detection signal of the first proximity sensor 502. A support plate is mounted on one side of the adapter 2, with a folded edge at its tail and a mounting through hole machined on the folded edge. The end of the travel link 501 is slidably connected to the mounting through hole. The elastic reset mechanism includes a retaining ring 508 and a reset spring 507. The retaining ring 508 is fixed to the travel link 501 by spot welding. The reset spring 507 is fitted between the retaining ring 508 and the folded edge of the support plate, and a corrugated dust cover 509 is fitted on the outside of the reset spring 507. The support plate has an L-shaped flap on its side, with an elongated hole machined on its upward-flipping structure. The first proximity sensor 502 is mounted at the elongated hole. The detection end of the first proximity sensor 502 faces the travel link 501, and the retaining ring 508 fixed on it serves as the detection position of the travel link 501. After the fire extinguisher nozzle is inserted into the press-fit position (fitted onto the nozzle positioning structure 504), its end pushes against the movable baffle 503, causing it to retract along the axis. This causes the sliding rod 506, connecting plate 505, and travel linkage 501 to move accordingly, transmitting the displacement of the movable baffle 503 to the rear. This brings the retaining ring 508 closer to the first proximity sensor 502, triggering an action signal and simultaneously compressing the return spring 507. The signal output of the first proximity sensor 502 is connected to the control unit of the driving gas source, thereby controlling the start of the guide rod cylinder 3 to complete one extension / retraction action. After the fire extinguisher nozzle is pressed and removed, the travel linkage 501 returns to its original position under the action of the return spring 507.

[0035] In the above design, whether the extinguisher nozzle is manually or automatically fed by a feeding mechanism, the retaining ring 508 can only approach the first proximity sensor 502 sufficiently after the extinguisher nozzle is fully inserted into the nozzle positioning structure 504 under pressure. This prompts the control unit of the gas source to generate a command based on the received signal, driving the guide rod cylinder 3 to move the wedge-type power chuck 4 to perform the pressing action. The nozzle positioning structure 504 maintains a fixed position during pressing, thus ensuring the coaxiality and insertion depth of the extinguisher nozzle during pressing. Furthermore, because the eight chucks 402 are linked, uniform pressing in all eight directions can be achieved, thereby improving pressing accuracy, ensuring consistency at the connection point, and enhancing reliability.

[0036] Furthermore, in order to detect the movement of the guide rod cylinder 3, a position detection unit is also installed on its side in this embodiment. The position detection unit is equipped with two second proximity sensors 6; The mounting platform 1 has a mounting baffle 201 on its side. The mounting baffle 201 is fixedly connected to the adapter 2 by bolts. Two elongated holes are horizontally machined on the mounting baffle 201, and two second proximity sensors 6 are respectively installed in the corresponding elongated holes. The two second proximity sensors 6 are adjusted to their lateral positions in the elongated holes so that they are respectively located in the initial position and the operating position of the cylinder 301. When the cylinder 301 is in the initial position, the rear flange of the cylinder 301 causes the rearmost second proximity sensor 6 to generate a signal, indicating that the cylinder 301 is in the initial position and has not moved. When the cylinder 301 moves axially to the position where the chuck 402 engages inward, the rear flange of the cylinder 301 causes the frontmost second proximity sensor 6 to generate a signal, indicating that the cylinder 301 is in the operating position and the pressing action has been completed.

[0037] Optionally, in another embodiment, when the fire extinguisher nozzle crimping device is used for manual feeding and crimping, the safety of the operator must also be considered. Since manual feeding requires manually holding the hose, metal ring, and fire extinguisher nozzle and feeding them into the crimping position, and continuously applying force to ensure the nozzle is properly fitted into the nozzle positioning structure, there is a possibility of human error. Specifically, if the operator's hand slips, it may accidentally reach into the crimping position, which would trigger the guide rod cylinder 3 and create a dangerous situation. Therefore, a corresponding safety device is also provided, which includes a power supply, a current generator, a current sensor, a controller, and an insulating baffle 7. Furthermore, the power supply is connected to the current generator, which generates a rated weak current. The current generator is connected to the power chuck through a detection circuit, and a current sensor is connected in series in the detection circuit. Specifically, a DC power supply is used, connected to a current generator via positive and negative wires. The output side of the current generator is connected to a loop as a detection circuit. The positive wire of the detection circuit is directly connected to the power chuck, and the negative wire is connected to mounting platform 1. A current sensor is connected in series on the negative wire to collect the current change in the detection circuit. The current sensor signal output is then connected to the controller. To reduce false alarms, such as... Figure 8 As shown, an insulating baffle 7 is also installed on the front side of the power chuck. The insulating baffle 7 is made of insulating non-metallic material and has an overall ring structure with a gap in the middle for the exposed pressing position to achieve normal pressing operation. The output of the controller is connected to the control unit of the drive air source. When the operator's hand abnormally approaches the power chuck, the capacitance effect will affect the current in the detection circuit, causing it to change. This change is detected by the current sensor and transmitted to the controller, which then generates an emergency stop command and sends it to the control unit of the drive air source to stop or retract the guide rod cylinder 3.

[0038] Furthermore, due to the slow response speed of the pneumatic structure, if a person's hand slips and falls into the gripper 402, the short-term continuous compression can cause serious hand injury. Therefore, a thrust restraint mechanism 8 is also provided. The thrust restraint mechanism 8 is as follows... Figure 8 As shown, the device includes a rotary stop lever 802, a counterweight 803, a stop lever switch 805, a stop pin 801, and a preload spring 804. The stop pin 801, protruding outwards, is fixedly connected to the cylinder body 301. The middle part of the rotary stop lever 802 is rotatably connected to the mounting platform 1 via a rotating shaft. When the upper end of the rotary stop lever 802 rotates, at least a segment of its trajectory intersects the trajectory of the stop pin 801; that is, when the upper segment of the rotary stop lever 802 swings from a horizontal position to an upward position, it contacts the stop pin 801, which moves forward with the cylinder body 301. The lower segment of the rotary stop lever 802 is equipped with a counterweight 803. A stop lever switch 805 is installed on the mounting platform 1. The stop lever switch 805 has a fan-shaped locking tongue structure and is driven by a servo motor installed inside the mounting platform 1. When the stop lever switch 805 swings outward with the servo motor arm, it extends out of the side of the mounting platform 1; when the stop lever switch 805 swings inward with the servo motor arm, it retracts into the mounting platform 1, thereby releasing the rotary stop lever 802 in the horizontal position. The stop lever switch 805 is also electrically connected to the controller. A pre-tension spring 804 is installed between the upper part of the rotary stop lever 802 and the adapter 2. When the rotary stop lever 802 is in the horizontal locked position of the stop lever switch 805, the pre-tension spring 804 applies the maximum tension to the rotary stop lever 802. When the thrust mechanism 8 is in normal operation, the slewing lever 802 is placed horizontally and its slewing motion is blocked by the lever switch 805. At this time, the tension of the pre-tension spring 804 is at its maximum. When the lever switch 805 of the thrust mechanism 8 receives an emergency stop command from the control, the servo motor drives the lever switch 805 to retract, thereby releasing the slewing lever 802. Under the dual action of the counterweight 803 and the pre-tension spring 804, the slewing lever 802 rotates rapidly and collides with the stop pin 801. The impact force brakes the cylinder 301 and causes it to retract slightly, thereby reducing injury to the operator's hands.

[0039] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. A fire extinguisher nozzle crimping device, characterized in that, Includes mounting platform, linear motion mechanism, wedge-type power chuck and limit switch; The fixed end of the linear motion mechanism is fixedly connected to the mounting platform, and the movable end is fixedly connected to the wedge-shaped sleeve of the wedge-type power chuck; the power chuck of the wedge-type power chuck is directly or indirectly fixedly connected to the mounting platform; the jaws of the wedge-type power chuck move radially, and the jaw ends slide in engagement with the wedge-shaped sleeve. The inner side of the wedge-type power chuck is also provided with a nozzle positioning structure; the nozzle positioning structure is directly or indirectly fixedly connected to the mounting platform, and the nozzle positioning structure is adapted to the fire extinguisher nozzle; the detection end of the limit switch is installed on the axial rear side of the nozzle positioning structure; the limit switch is electrically connected to the control unit of the linear motion mechanism, and is at least used to control the start of the linear motion mechanism.

2. The fire extinguisher nozzle crimping device according to claim 1, characterized in that, The linear motion mechanism is a guide rod cylinder, including a guide rod, a cylinder body, and a piston rod; the guide rod cylinder is connected to an external drive air source through a pipeline; The mounting platform is also equipped with a vertical adapter; The end of the piston rod is fixedly connected to the adapter seat; The guide rod passes through the guide rod cylinder and is fixedly connected to the adapter; the front end of the guide rod is fixedly connected coaxially to the power chuck. The cylinder body and the wedge-shaped sleeve are coaxially and fixedly connected.

3. The fire extinguisher nozzle crimping device according to claim 2, characterized in that, The limit switch is an inductive switch, including a proximity sensor, a travel linkage, and a movable baffle; The guide rod has a hollow structure; the stroke connecting rod is nested in the guide rod and slides with the guide rod; One end of the stroke link is fixed with the movable baffle, which is a detection end located on the axial rear side of the nozzle positioning structure; the proximity sensor is installed on the side of the other end of the stroke link; an elastic reset mechanism is provided between the stroke link and the guide rod or the adapter. The travel linkage is provided with a detection position for triggering the detection signal of the proximity sensor; The signal output terminal of the proximity sensor is connected to the control unit of the driving air source.

4. The fire extinguisher nozzle crimping device according to claim 3, characterized in that, The guide rod has a cavity, and a connecting plate is provided inside the cavity; One side of the connecting plate is fixedly connected to the stroke connecting rod, and the other side is provided with multiple sliding rods; the end face of the cavity is provided with multiple through holes, and a sliding rod is installed in each through hole; the end of the sliding rod is fixedly connected to the movable baffle. The end of the guide rod passes through the movable baffle and is fixedly connected to the nozzle positioning structure.

5. The fire extinguisher nozzle crimping device according to claim 3 or 4, characterized in that, A support plate is installed on one side of the adapter, and a folded edge is provided at the tail of the support plate, with a mounting through hole machined on the folded edge; The end of the travel link is slidably connected to the mounting through hole; The elastic reset mechanism includes a retaining ring and a reset spring; The retaining ring is fixed on the travel link, and the return spring is located between the retaining ring and the folded edge of the support plate.

6. The fire extinguisher nozzle crimping device according to claim 5, characterized in that, The pallet is provided with a flap on its side; The flip plate is machined with an elongated hole, and the proximity sensor is installed at the elongated hole; The detection end of the proximity sensor faces the travel link, and the retaining ring is the detection position of the travel link.

7. The fire extinguisher nozzle crimping device according to claim 1, characterized in that, The linear motion mechanism is provided with a position detection unit on its side; The position detection unit is fixedly connected to the mounting platform via an adapter.

8. The fire extinguisher nozzle crimping device according to claim 7, characterized in that, The position detection unit is equipped with two proximity sensors; The mounting platform is provided with a mounting baffle on its side, and the mounting baffle is provided with an elongated hole, and the proximity sensor is installed at the elongated hole; The two proximity sensors correspond to the initial position and the working position located at the moving end of the linear motion mechanism, respectively.

9. The fire extinguisher nozzle crimping device according to claim 2, characterized in that, When the fire extinguisher nozzle crimping device is used for manual feeding and pressing, it also includes a safety device; the safety device is equipped with a power supply, a current generator, a current sensor, a controller, and an insulating baffle. The power supply is connected to the current generator, and the current generator is connected to the power chuck through a detection circuit; the current sensor is connected in series on the detection circuit. The current sensor is used to collect the current change of the detection circuit, and the current sensor signal output terminal is connected to the controller. The output of the controller is connected to the control unit of the driving air source; The insulating baffle has a ring structure and is installed on the front side of the power chuck.

10. The fire extinguisher nozzle crimping device according to claim 9, characterized in that, It also includes a thrust mechanism; the thrust mechanism is provided with a rotary stop bar, a counterweight, a stop bar switch, a stop pin, and a preload spring; The stop pin is installed on the movable end of the linear motion mechanism; The middle part of the rotary stop bar is rotatably connected to the mounting platform; the movement trajectory of one end of the rotary stop bar intersects with the movement trajectory of the stop pin, and the counterweight is installed at the other end; The stop switch is installed on the mounting platform to release the rotation stop in a horizontal position; the stop switch is electrically connected to the controller. The pre-tension spring is installed between the slewing stop and the mounting platform; when the slewing stop is in the stop switch locked position, the tension applied by the pre-tension spring to the slewing stop is at its maximum.

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