Fusion tube assembly assembling equipment, assembling process method and fusion tube assembly

Abstract

The invention relates to the technical field of fusing equipment, in particular to fusion tube assembly assembling equipment, an assembling process method and a fusion tube assembly. Two independent fixedly-connected external member assembling units are sequentially arranged along a circulation path, so that the two ends of a fusion tube assembly can be independently assembled step by step, a depth-keeping pressing mechanism is matched to drive a fusion tube barrel and a fixedly-connected external member in a positioning module to axially and rigidly abut against each other, and physical contact is used as a press fitting terminal point; according to the step-by-step independent compaction mechanism, the dimensional tolerance of each end can be eliminated in a self-adaptive mode, it is ensured that the rigid abutting state can be achieved even if the material tolerances of the two ends are inconsistent, and the consistency of the axial pre-tightening amount of the two ends is ensured; the high pre-tightening force state after clearance elimination is directly solidified into the relative position relation of the locking hole, and the overall mechanical strength of a finished product is remarkably improved.

Description

A fusible tube assembly equipment, assembly process, and fusible tube assembly Technical Field

[0001] This invention relates to the field of fusing equipment technology, and in particular to a fusing tube assembly equipment, assembly process method and fusing tube assembly. Background Technology

[0002] Drop-out fuses are short-circuit protection switches used in power distribution networks. Their core component, the fuse tube assembly, typically includes an insulated fuse tube body and metal fittings at both ends. The upper fixed fitting has a conductive contact surface for engaging with the stationary contact, while the lower fixed fitting (i.e., the lower contact assembly) is connected to a lower rotating shaft seat via a rotating shaft to achieve the drop-out action. During assembly, the fuse tube assembly must strictly meet two key requirements: first, mechanical connection strength, which must withstand the impact of high-pressure gas generated inside the tube when interrupting a short-circuit current; and second, spatial geometric accuracy, meaning the rotation axis of the lower contact assembly must maintain a strictly predetermined angle relationship with the conductive contact surface of the upper fixed fitting. Otherwise, the fuse tube will fail to close the circuit or drop out due to trajectory deviation.

[0003] In the existing manufacturing of fusible tube assemblies, in order to ensure the connection strength between the metal kit and the insulating cylinder, a pin-penetration locking process is usually adopted. That is, the two ends of the insulating fusible tube cylinder are first inserted into two fixing kits respectively, the position is adjusted so that the tube body is aligned with the preset hole on the kit, and then drilling and pin insertion are performed to fasten the two together.

[0004] However, in actual industrial production, this traditional pin-through locking process has significant quality defects. On the one hand, due to the manufacturing tolerances of the insulating cylinder and the fixing kit, connecting based solely on the pin hole position often results in the cylinder end being locked by the pin before it has formed a tight contact with the inner bottom wall of the kit. This "locking before tight contact" state severely weakens the connection strength and makes it difficult to withstand the impact load when it melts. On the other hand, the existing technology lacks a mandatory phase calibration mechanism for the relative positions of the fixing kits at both ends, which can easily lead to secondary problems such as angular phase deviation in the finished product.

[0005] Therefore, how to effectively eliminate axial misalignment caused by manufacturing tolerances and assembly methods, thereby ensuring the mechanical connection strength of the fusible tube assembly after locking, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] (i) The technical problem to be solved by the present invention is that the assembly process of the fusion tube assembly in the prior art is subject to manufacturing tolerances and lack of continuous axial pre-tightening constraints, which results in the failure of the fusion tube cylinder and the fixing kit to form a tight contact before locking, thereby generating axial gap and seriously weakening the mechanical connection strength of the product.

[0007] (II) Technical Solution To solve the above-mentioned technical problems, the present invention provides a fusion tube assembly equipment, comprising: a frame, a support platform disposed on the frame, and two fastening kit assembly units; wherein, the two fastening kit assembly units are sequentially disposed on the support platform along the flow path of the fusion tube assembly, for sequentially completing the assembly of fastening kits at both ends of the fusion tube cylinder; each of the two fastening kit assembly units includes: a positioning module, having a positioning cavity for accommodating the corresponding fastening kit, the positioning cavity being configured to constrain the radial degree of freedom of the fastening kit and define an axial assembly limiting reference relative to the fastening kit; a fixed-depth clamping mechanism, The system includes a pressure-applying part spaced axially relative to the positioning module. The pressure-applying part is configured to coaxially hold one end of the molten tube cylinder away from the positioning module and drive the molten tube cylinder to be inserted axially into the fixing kit until the molten tube cylinder forms a rigid stop with the axial assembly limit reference, thereby establishing a constant assembly preload, and the pressure-applying part maintains the axial pressure-holding state. A drilling mechanism is located to the side of the positioning module and is configured to drill a locking hole in the side wall of the molten tube cylinder, guided by a preset hole position on the fixing kit, under the condition that the pressure-applying part maintains the axial pressure-holding state.

[0008] According to one embodiment of the present invention, the fusion tube assembly equipment further includes a negative pressure chip suction assembly, which includes a chip suction hood, a negative pressure channel, and a negative pressure source. The chip suction hood is arranged laterally to the positioning module and adjacent to the drilling area of ​​the drilling mechanism, and the chip suction hood has an intake port facing a preset hole position of the fixing kit. One end of the negative pressure channel is connected to the intake port, and the other end is connected to the negative pressure source, so as to form a negative pressure airflow at the intake port to suck up drilling chips when the drilling mechanism performs drilling.

[0009] By arranging a negative pressure chip suction component adjacent to the side of the drilling mechanism and making the suction inlet face the drilling area, the near-field high negative pressure airflow can directly capture and discharge the dust and debris generated when the drill bit cuts the insulating cylinder (usually a composite material such as epoxy glass cloth tube) through a negative pressure channel. This mechanism achieves "instant cleaning at the source" of drilling waste. On the one hand, it effectively prevents highly insulating glass fiber debris from splashing and accumulating inside the molten tube or in the mating gaps of the fixing kit, thereby eliminating the risk of reduced insulation strength or surface creepage caused by residual foreign matter in the finished product. On the other hand, the continuous negative pressure suction airflow also effectively reduces the pollution and wear of highly abrasive dust on the precision positioning module and moving parts, while also improving the hygiene of the operator's working environment.

[0010] Furthermore, the fixing kit assembly unit also includes a protective baffle plate erected on the support platform; the protective baffle plate surrounds the outer periphery of the positioning module to divide the area where the positioning module is located into an inner operating position located on one side of the positioning module and an outer operating position located on the side of the operator; the dust suction cover of the negative pressure dust suction assembly is located in the inner operating position of the protective baffle plate.

[0011] By dividing the processing area into physically isolated inner and outer sections with protective barriers, a rigid safety barrier is first constructed, preventing personal injury risks to operators from potential mechanical failures (such as drill bit breakage and splashing) of the high-speed drilling mechanism and high-pressure application section. More importantly, the negative pressure chip suction component is enclosed inside the barriers, using the barriers as airflow boundaries to form a relatively closed local micro-negative pressure chamber around the drilling area. This semi-enclosed structure effectively limits the diffusion path of cutting chips. Even if a small amount of chips escapes the direct capture range of the suction inlet, they will be intercepted by the barriers and confined to the inner area, preventing them from drifting to the outer operating position, thereby maximizing the cleanliness of the external workshop environment.

[0012] According to one embodiment of the present invention, the fixed fitting assembly unit located downstream of the flow path along the assembly of the melt tube assembly in the two fixed fitting assembly units is further provided with a phase positioning member. The phase positioning member is disposed on the outside of the positioning cavity of the positioning module and has a reference abutment surface extending along the axial direction of the melt tube body. The reference abutment surface is used to abut against the side wall of the protruding operating part of the fixed fitting already assembled on the first end of the melt tube body to restrict the circumferential rotational freedom of the melt tube body about its axis, so that the fixed fitting at the second end and the fixed fitting at the first end maintain a preset angular assembly position relationship during assembly.

[0013] By introducing a phase positioning component with an axially extending reference bearing surface into the downstream assembly unit, the pre-assembled first-end fixing kit is used as an angular index reference. During the pressing and drilling locking process of the second end, this reference bearing surface is forcibly pressed against the side wall of the outwardly protruding operating part of the first-end fixing kit, thus constructing a rigid circumferential anti-rotation constraint. This mechanism effectively overcomes the random torsion or elastic instability that easily occurs in slender melt tube cylinders under axial force, ensuring that the fixing kit at the second end is pressed in and drilled strictly according to the preset angle relative to the first end. This ensures the angular phase consistency of the key functional surfaces at both ends of the finished product, avoiding problems such as mesh jamming or falling failure caused by phase deviation.

[0014] Furthermore, the fixed-depth pressing mechanism also includes a drive unit, a guide column, and a lifting support seat slidably disposed on the guide column; the power output end of the drive unit is connected to the lifting support seat and is configured to drive the lifting support seat to perform axial lifting motion along the guide column; the pressing unit is fixedly disposed at the bottom of the lifting support seat, and the phase positioning member is also fixedly connected to the lifting support seat so that the phase positioning member moves synchronously with the pressing unit.

[0015] By integrating the phase positioning component and the pressure application unit into the same lifting support, the phase positioning component can move synchronously with the pressure application unit along the axial direction of the melt tube cylinder and the first end fixing kit during the pressing action. This synchronous linkage mechanism ensures that the reference bearing surface of the phase positioning component and the side wall of the first end fixing kit remain relatively stationary throughout the entire dynamic pressing stroke, thereby effectively avoiding sliding friction caused by axial relative displacement between the two. While ensuring the phase constraint accuracy, it completely eliminates scratches and wear on the coating or smooth surface of the fixing kit caused by the positioning mechanism, ensuring the surface quality of the finished product.

[0016] According to one embodiment of the present invention, the fusion tube assembly equipment further includes a locking pin insertion unit disposed downstream of the two fixing kit assembly units along the flow path of the fusion tube assembly. The locking pin insertion unit includes: a support positioning component, including a pair of support supports disposed on the support platform, the pair of support supports being provided with a preset distance between them for supporting the fixing kits at both ends of the fusion tube assembly respectively, the support supports being provided with support grooves for forming a circumferential limit on the fixing kits to lock the circumferential posture of the fusion tube assembly, thereby causing the locking holes on the fixing kits to face the preset insertion path; and a pin insertion mechanism, including a pin insertion part, the pin insertion part being disposed corresponding to the insertion path for pressing the pin into the locking hole along the insertion path.

[0017] By using a dedicated support and positioning component to support the pre-pressed and drilled semi-finished product at both ends, and utilizing the shape-fitting effect of the support groove on the fixing kit, rapid reset and self-locking of the circumferential posture of the fusion tube assembly are achieved. This positioning mechanism can force the pre-machined locking holes on the side wall to precisely align with the movement path of the pin insertion part, ensuring the coaxiality of the pin insertion without the need for an additional visual hole-finding system. Combined with the high-pressure propulsion of the pin insertion part, the locking pin can be stably and efficiently pressed into the interference fit hole, thereby transforming the temporary friction-based holding connection between the fusion tube body and the fixing kit into a permanent mechanical interlock based on the pin's shear resistance, ensuring the structural reliability of the final product.

[0018] Furthermore, the locking pin insertion unit also includes a spacing adjustment assembly disposed on the support platform. The spacing adjustment assembly includes a linear guide rail extending along the arrangement direction of the two support supports and a drive screw. At least one of the pair of support supports is configured as a movable seat slidably disposed on the linear guide rail, and the drive screw is throttle-connected to the movable seat. The drive screw is configured to drive the movable seat to reciprocate along the linear guide rail to adjust the relative spacing between the pair of support supports.

[0019] By incorporating a lead screw-driven spacing adjustment assembly, precise adjustment of the span between a pair of support brackets is achieved. This mechanism provides the equipment with flexible adaptability to different specifications, especially different lengths of fusion tube assemblies. When producing different models of fusion tube products, the support position can be quickly adjusted simply by controlling the rotation of the drive lead screw, ensuring that the support brackets are always accurately supported at the effective location of the fixing kit. This eliminates the need to change special tooling or perform cumbersome mechanical reconfiguration of the machine, significantly improving the equipment's versatility and changeover efficiency for multi-variety mixed-line production.

[0020] This invention also provides an assembly process method for a fusible tube assembly, comprising the following steps: S1, pressing the first end of the fusible tube cylinder into a first fixing kit until the two are axially rigidly opposed, thereby establishing a first axial pre-tightening state to eliminate assembly gaps; while maintaining the first axial pre-tightening state, using a pre-set radially opposing through hole on the side wall of the first fixing kit as a guide, drilling is performed on the side wall area of ​​the fusible tube cylinder exposed in the hole to form a head-end locking hole, and the radial clamping force generated by the press-fitting of the fusible tube cylinder and the first fixing kit forms a head-end temporary holding connection that can maintain the first axial pre-tightening state; S2, while the head-end temporary holding connection is maintained, pressing the second end of the fusible tube cylinder into a second... Within the fastening kit, until the two parts are axially rigidly opposed, a second axial preload state is established to eliminate assembly gaps. Under the condition of maintaining the second axial preload state, guided by the pre-set radially opposing through hole on the side wall of the second fastening kit, the side wall area of ​​the molten tube exposed in the hole is drilled to form a tail-end locking hole. The radial clamping force generated by the press fit between the molten tube and the second fastening kit forms a tail-end temporary fastening connection that can maintain the second axial preload state. S3, with both the head-end temporary fastening connection and the tail-end temporary fastening connection maintained, the locking pin is pressed into the head-end locking hole and the tail-end locking hole to establish a rigid interlock between the fastening kit and the molten tube.

[0021] This process employs a combined operational logic of step-by-step independent depth determination and pressure-holding in-situ hole drilling. First, the assembly process at both ends is decoupled into two independent compaction and drilling cycles, allowing each end to reach its rigid stop limit position based on its own contact feedback. This adaptively compensates for manufacturing tolerances in the length of the fused tube or the depth of the assembly, ensuring that axial clearance is completely eliminated at both ends. Second, while maintaining axial preload, drilling is performed directly using the assembly hole positions as molds. Essentially, this physically solidifies the high-energy potential elastic state after clearance elimination through the hole geometry. At this point, even if external pressure is removed, the radial clamping force of the interference fit can maintain this hole alignment until the pin is inserted in step S3, ultimately permanently locking this zero-clearance, high-strength connection state, thus ensuring the excellent mechanical impact resistance of the finished product.

[0022] Further, in step S2, on the moving path of the melt tube body to establish the second axial pre-tightening state, a linear guiding constraint is applied to the outer contour of the first fixing kit, and before the second fixing kit is pressed into the second end of the melt tube body, the circumferential posture of the melt tube body is locked by the linear guiding constraint, so that the first end locking hole and the tail end locking hole maintain a preset angular phase consistency; in step S3, a mechanical thrust is simultaneously applied to the locking pins at the first end locking hole and the tail end locking hole to synchronously establish a rigid interlock between the fixing kit and the melt tube body at both ends.

[0023] By introducing linear guiding constraints on the second-end press-fitting path, and using the already assembled first end as an attitude reference in advance, the circumferential degree of freedom of the molten tube is locked before entering the high-resistance press-fitting zone. This pre-guiding mechanism eliminates the risk of torsion caused by instability during the press-fitting process of the long tube, ensuring that the locking hole position of the second end is strictly aligned with the phase reference generated at the first end, thereby guaranteeing the angular accuracy of the key functional surfaces at both ends of the finished product. In addition, the use of simultaneous application of thrust at both ends to insert the pin avoids axial movement or force imbalance of the tube that may be caused by force applied at one end, ensuring a smooth and balanced final mechanical interlocking process, and further improving the consistency of assembly quality.

[0024] The present invention also provides a fusible tube assembly, which is assembled using any of the above-described fusible tube assembly assembly equipment and / or the above-described assembly process methods; it includes a fusible tube body, a first fixing kit and a second fixing kit respectively sleeved at both ends of the fusible tube body, and a locking pin; the side walls of the first fixing kit and the second fixing kit are provided with through pin holes; the side walls of the fusible tube body, which are accommodated within the first fixing kit and the second fixing kit, are provided with locking grooves corresponding to the positions of the pin holes; the locking pin passes through the pin holes and is pressed into the locking grooves to fix the first fixing kit and the second fixing kit to both ends of the fusible tube body.

[0025] Since the fuse tube assembly is manufactured based on the aforementioned rigid pressure holding and in-situ drilling process, the locking groove on its fuse tube cylinder is machined in a state where the cylinder end face is tightly abutting against the inner bottom wall of the fixing kit and is under axial pre-tightening. Therefore, the cooperation between the locking pin and the locking groove essentially permanently locks this elastic pre-tightening state, so that the finished product eliminates all axial assembly gaps in a static state, constructing a high-rigidity connection structure that can resist the impact of high-pressure gas at the moment of melting, significantly reducing the risk of kit detachment or tube body rupture. At the same time, the strict phase relationship maintained by the fixing kits at both ends ensures the reliability of the product in the power distribution network for aligning and drop operation.

[0026] (III) Beneficial effects of the present invention: By sequentially setting two independent fixing kit assembly units along the flow path, the two ends of the fusible tube assembly can be assembled independently in steps. With the fixed depth pressing mechanism, the fusible tube cylinder and the fixing kit in the positioning module are driven to achieve axial rigid abutment respectively, using physical contact as the pressing end point. This step-by-step independent compaction mechanism can adaptively eliminate the dimensional tolerance of each end, ensuring that even if the material tolerances at both ends are inconsistent, the rigid abutment state of eliminating gaps can be achieved respectively, thereby ensuring the consistency of the axial preload at both ends. Furthermore, the drilling mechanism performs in-situ hole forming under the condition of maintaining axial pressure in the pressure application part, forcibly overcoming the elastic rebound tendency of the insulating cylinder material, and directly solidifying the high preload state after eliminating gaps into the relative positional relationship of the locking hole, thereby ensuring that both ends of the fusible tube assembly can be connected in a tightly fitted rigid interlocking state, significantly improving the overall mechanical strength of the finished product. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 is a three-dimensional structural diagram of a fuse tube assembly device according to an embodiment of the present invention; Figure 2 is a three-dimensional structural diagram of two fixing kit assembly units according to an embodiment of the present invention; Figure 3 is a three-dimensional structural diagram of a drilling mechanism according to an embodiment of the present invention; Figure 4 is a three-dimensional structural diagram of a fixed-depth clamping mechanism according to an embodiment of the present invention; Figure 5 is a three-dimensional structural diagram of another fixed-depth clamping mechanism according to an embodiment of the present invention; Figure 6 is a partial three-dimensional structural diagram of two fixing kit assembly units according to an embodiment of the present invention; Figure 7 is a three-dimensional structural diagram of the cooperation relationship between a positioning module and a first fixing kit according to an embodiment of the present invention; Figure 8 is a three-dimensional structural diagram of the cooperation relationship between another positioning module and a second fixing kit according to an embodiment of the present invention; Figure 9 is a three-dimensional structural diagram of a locking pin implantation unit according to an embodiment of the present invention; Figure 10 is a three-dimensional structural diagram of a support bracket according to an embodiment of the present invention; Figure 11 is a three-dimensional structural diagram of a fuse according to an embodiment of the present invention; Figure 12 is a cross-sectional structural diagram of a fuse tube assembly according to an embodiment of the present invention; Figure 13 is a three-dimensional structural diagram of a fuse tube cylinder according to an embodiment of the present invention.

[0029] Icons: 1. Frame; 11. Support platform; 2. Fixing kit assembly unit; 21. Positioning module; 211. Positioning cavity; 22. Depth clamping mechanism; 221. Pressure application unit; 222. Drive unit; 223. Guide column; 224. Lifting support seat; 23. Drilling mechanism; 231. Drill bit; 232. Position adjustment mechanism; 24. Negative pressure chip suction assembly; 241. Chip suction hood; 242. Negative pressure channel; 243. Negative pressure source component; 25. Protective enclosure plate; 3. Locking pin insertion unit 31. Support bracket; 311. Support groove; 321. Linear guide rail; 322. Drive screw; 33. Pin insertion mechanism; 4. Lower pivot seat forming unit; 5. Lower pivot seat assembly unit; 6. Control unit; 7. Phase positioning component; 71. Reference bearing surface; 72. Position adjustment component; 10. Fusion tube assembly; 101. Fusion tube cylinder; 102. First fixing kit; 103. Second fixing kit; 104. Locking pin; 105. Pin hole; 106. Locking groove. Detailed Implementation

[0030] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] This embodiment provides a fuse tube assembly 10 assembly equipment, which is suitable for the production and assembly of fuse tube assemblies 10 for drop-out fuses. Before describing the equipment structure in detail, the product structure and assembly mechanism of the fuse tube assembly 10 produced by this equipment will be explained first to facilitate understanding of the subsequent equipment operation logic.

[0032] As shown in Figures 11 to 13, the fusible tube assembly 10 mainly consists of a fusible tube cylinder 101 as the insulating body, a first fixing kit 102 and a second fixing kit 103 respectively sleeved at both ends of the fusible tube cylinder 101, and a locking pin 104 for mechanical locking. The first fixing kit 102 is typically an upper contact assembly with an operating pull ring, and the second fixing kit 103 is part of a lower moving head assembly. In addition to the second fixing kit 103, the lower moving head assembly also includes a rotating shaft and a lower rotating shaft seat rotatably connected via the rotating shaft. To achieve connection, two through pin holes 105 are provided on the side wall of the first fixing kit 102; and one through pin hole 105 is provided on the side wall of the second fixing kit 103. These three pin holes 105 are typically spaced apart axially or circumferentially to provide stronger torque resistance. Both ends of the fusible tube body 101 are inserted into the inner cavities of the first fastening assembly 102 and the second fastening assembly 103, respectively. A non-penetrating locking groove 106 is machined on the outer wall of the fusible tube body 101 at a position corresponding to the pin hole 105. The locking pin 104 passes tightly through the pin hole 105 on the fastening assembly and is pressed into the locking groove 106 on the fusible tube body 101. The shear resistance of the pin securely connects the first fastening assembly 102 and the second fastening assembly 103 to both ends of the fusible tube body 101, forming an integrated assembly.

[0033] As shown in Figures 1 to 10, the core application scenario of this fusion tube assembly 10 equipment is to assemble the separated fusion tube cylinder 101, the first fixing kit 102, and the second fixing kit 103 with high precision through an automated process. Its technological feature lies in the combination of "sequential press-fitting" and "in-situ machining." First, the fixing kit is press-fitted into place with the fusion tube cylinder 101, and then locking grooves 106 are drilled directly into the fusion tube cylinder 101 through the pin holes 105 on the fixing kits. This assembly operation aims to ensure that the end face of the fusion tube cylinder 101 forms an axial rigid abutment with the inner bottom surfaces of the two fixing kits, thereby completely eliminating assembly gaps and establishing a stable axial preload. Simultaneously, when assembling the second end, the posture of the first end is strictly referenced to ensure that the fixing kits at both ends maintain a preset angular phase relationship, thus avoiding axial misalignment, loosening, or phase deviation caused by material manufacturing tolerances.

[0034] As shown in Figures 1 and 2, the main structure of the assembly equipment includes a frame 1 and a support platform 11 mounted on the frame 1. Along the assembly flow path of the molten tube assembly 10, two independent fastening kit assembly units 2 are sequentially arranged on the support platform 11 to complete the pressing and drilling processes at both ends, respectively. Downstream of the two fastening kit assembly units 2, a locking pin insertion unit 3, a lower shaft seat forming unit 4, and a lower shaft seat assembly unit 5 are sequentially arranged, respectively for completing the pressing and locking of the pins, the assembly and forming of the shaft seat, and the subsequent forming and final assembly processes of assembling the rotary shaft and the lower shaft seat onto the second fastening kit 103. Furthermore, a control unit 6 is also provided on the support platform 11 for centrally controlling the coordinated operation of each assembly unit. The specific structure of each assembly unit will be described in detail below.

[0035] Two fastening assembly units 2 are sequentially positioned on the platform 11 along the flow path of the fusion tube assembly 10, and are respectively defined as the upstream assembly unit and the downstream assembly unit, used to sequentially complete the fastening assembly of the two ends of the fusion tube cylinder 101. Both fastening assembly units 2 include a positioning module 21 and a fixed-depth clamping mechanism 22 in their basic structure. The positioning module 21 is fixedly mounted on the platform 11, and its main structure is a rigid bearing mold, with the center of the mold recessed downwards to form a positioning cavity 211.

[0036] As shown in Figures 7 and 8, in this embodiment, the positioning cavity 211 is not simply a circular hole, but is designed to mimic the irregular contour of the outer surface of the fastening kit (e.g., a laterally protruding operating ring, mounting ear, or rotating shaft protrusion). A limiting groove adapted to the aforementioned irregular contour is formed on the edge of the positioning cavity 211. When the fastening kit is inserted into the cavity, its outer protrusion engages with the limiting groove, thereby constraining the radial and circumferential rotational freedom of the fastening kit in the horizontal plane. Simultaneously, the bottom of the positioning cavity 211 has a bearing surface made of hard metal, which forms an axial assembly limiting reference relative to the fastening kit.

[0037] As shown in Figures 2, 4, and 5, a fixed-depth clamping mechanism 22 is provided vertically above the positioning module 21. The specific structure of this mechanism includes two precision guide columns 223 erected on the support platform 11, a lifting support seat 224 slidably sleeved on the guide columns 223, and a drive unit 222 that drives the lifting support seat 224. The drive unit 222 can be a servo electric cylinder or a pneumatic-hydraulic booster cylinder, and its power output end is connected to the lifting support seat 224, driving it to perform high-precision axial lifting and lowering movements along the guide columns 223. A pressure application part 221 is coaxially fixed at the center of the bottom surface of the lifting support seat 224. This pressure application part 221 is configured to coaxially hold the end of the melt tube cylinder 101 opposite to the positioning module 21 (i.e., the upper end). To accommodate different pipe diameters or process requirements, the holding structure of the pressure application section 221 can adopt a stepped insertion mandrel, using the slight interference fit between the mandrel and the inner wall of the pipe to achieve temporary gripping; or it can use a pneumatic expansion sleeve, elastic clamping claw, or other structures to hook the pipe opening. During assembly, the drive section 222 drives the pressure application section 221 to move the molten tube cylinder 101 downwards, forcibly pressing the lower end of the molten tube cylinder 101 into the fixing kit located in the positioning module 21, until the end face of the molten tube cylinder 101 rigidly abuts against the axial assembly limit reference at the bottom of the positioning cavity 211. At this point, the drive section 222 stops feeding and maintains pressure, thereby establishing a constant assembly preload based on eliminating all assembly gaps.

[0038] For the assembly unit 2 of the fixing kit located downstream of the flow path (i.e., the unit used to assemble the second end kit), in order to ensure that the second end fixing kit maintains strict angular phase consistency with the assembled first end fixing kit, this unit is specially equipped with a phase positioning component 7. The phase positioning component 7 is fixedly connected to the side of the lifting support 224 through the position adjustment component 72, so that it can move up and down synchronously with the pressure application part 221. In this embodiment, the phase positioning component 7 mainly includes an extension bracket extending to the upper side of the positioning module 21 and an adjustable limiting plate installed at the end of the bracket; the position adjustment component 72 adopts a sliding nut locking structure or a screw fine adjustment structure, allowing the operator to adjust the height and horizontal position of the limiting plate according to the length specification of the melt tube assembly 10. The limiting plate is provided with a reference abutment surface 71 extending axially along the melt tube cylinder 101, and the reference abutment surface 71 is configured as a one-way stop structure. When the pressure part 221 holds the molten tube 101, which has been assembled with the first end fitting, and presses it down into the second end, the outwardly protruding operating part (such as the side wall of the operating pull ring) on ​​the first end fixing fitting will abut against the reference support surface 71. By utilizing the lateral blocking effect of the reference support surface 71, the circumferential rotational freedom of the molten tube 101 around its axis is restricted, thereby forcibly correcting and locking the angular posture of the molten tube 101, ensuring that the fixing fitting of the second end (whose angle has been locked by the positioning module 21) and the fixing fitting of the first end maintain the preset angular assembly position relationship at the end of the pressing.

[0039] As shown in Figures 1 to 3, the drilling mechanism 23 is located to the side of the positioning module 21. Its core function is to perform in-situ lateral drilling while maintaining the axial rigidity and pressure of the melt tube cylinder 101 and the fixing kit in the pressure application part 221. The drilling mechanism 23 mainly consists of a position adjustment mechanism 232 and a power drilling assembly mounted on the mechanism. The position adjustment mechanism 232 is configured to drive the power drilling assembly to perform multi-degree-of-freedom displacement in space to adapt to the height of the pin holes 105 of different specifications of fixing kits and to perform drilling feed actions. In this embodiment, the position adjustment mechanism 232 adopts a precision linear module structure, specifically including a base fixed on the frame 1, a feed slide assembly horizontally arranged on the base, a vertical support erected on the feed slide assembly, and a lifting slide assembly slidably arranged on the vertical support. Both the horizontal feed slide assembly and the lifting slide assembly use servo motors or stepper motors as power sources. Through ball screw transmission and linear guide rail 321 guidance, they drive the power drilling assembly to move in the horizontal direction (feed direction) and the vertical direction (hole-facing direction), respectively.

[0040] The power drilling assembly is mounted on the lifting slide assembly of the position adjustment mechanism 232, and includes a high-speed rotary motor and a drill bit 231 connected to the output shaft of the motor. During operation, the vertical movement of the position adjustment mechanism 232 first precisely adjusts the central axis of the drill bit 231 to a height coaxial with the preset pin hole 105 on the side wall of the fixing kit. Then, the horizontal feed slide assembly is controlled to drive the rotating drill bit 231 forward in the horizontal direction. At this time, because the fixing kit is made of high-strength metal and is firmly constrained by the positioning module 21, the preset pin hole 105 on the fixing kit actually acts as a drill jig sleeve or guide sleeve. The drill bit 231 directly passes through the pin hole 105 and contacts the side wall of the melt tube 101, cutting the melt tube 101 under the physical guidance of the pin hole 105, thereby machining a locking hole on the melt tube 101 that is completely concentric with the pin hole 105 of the fixing kit. After completing the operation, it retracts along the original path.

[0041] As shown in Figure 6, in order to collect the waste generated during drilling operations, the mounting unit 2 of the fixing kit in this embodiment is also equipped with a negative pressure waste suction assembly 24. This assembly mainly consists of a waste suction hood 241, a negative pressure channel 242, and a negative pressure source component 243. The waste suction hood 241 is constructed as a hollow hood in the shape of a flared or funnel, which is located on the side of the positioning module 21 and is arranged adjacent to the working area of ​​the drill bit 231 of the drilling mechanism 23. The suction port of the waste suction hood 241 faces the preset hole position to be drilled on the fixing kit to capture the debris generated by cutting. One end of the negative pressure channel 242 is connected to the exhaust port of the waste suction hood 241, and the other end passes downward through the surface of the support platform 11 and is connected to the negative pressure source component 243 built under the frame 1. When the drilling mechanism 23 performs the drilling action, the negative pressure source 243 is activated, and a directional negative pressure airflow is formed at the suction port of the chip suction hood 241 through the negative pressure channel 242, which sucks in and discharges the dust and debris cut by the drill bit 231 into the melt tube cylinder 101.

[0042] In addition, the mounting unit 2 of the fixing kit is also equipped with a protective enclosure 25 on the support platform 11. The protective enclosure 25 is constructed as a semi-enclosed fence structure spliced ​​together from three vertical baffles on the left, right, and rear sides, with its opening facing away from the operator. The protective enclosure 25 surrounds the outer perimeter of the positioning module 21, spatially dividing the processing area where the positioning module 21 is located into an inner working position located inside the enclosure and an outer working position located on the operator's side. On the support platform 11 below the area enclosed by the protective enclosure 25, a waste chip collection trough is recessed; this waste chip collection trough is located around the base of the positioning module 21 and is used to receive and collect larger particles of waste chips that cannot be sucked away by the negative pressure airflow. The chip suction hood 241 of the negative pressure chip suction assembly 24 is also arranged in the inner working position of the protective enclosure 25.

[0043] As shown in Figures 9 and 10, the locking pin insertion unit 3 is located downstream of the two fastening kit assembly units 2 along the flow path of the fusion tube assembly 10. It includes a support and positioning component, comprising a pair of support supports 31 mounted on the support platform 11. The pair of support supports 31 are spaced at a preset distance to support the fastening kits at both ends of the fusion tube assembly 10. Each support support 31 has a support groove 311 for circumferentially limiting the fastening kits to lock the circumferential posture of the fusion tube assembly 10, thereby ensuring that the locking holes on the fastening kits face the preset insertion path. The locking pin insertion unit 3 is located downstream of the two fastening kit assembly units 2 along the flow path of the fusion tube assembly 10 and is used to press the locking pins 104 into the drilled ends of the fusion tube assembly 10. This unit mainly consists of the support and positioning component, the pin insertion mechanism 33, and the spacing adjustment component.

[0044] The support and positioning assembly includes a pair of support brackets 31 disposed on the surface of the support platform 11, with a preset axial distance between them, used to support the first fixing kit 102 and the second fixing kit 103 at both ends of the fusion tube assembly 10, respectively. To ensure that the pin can be accurately pressed into the locking hole, each support bracket 31 has a support groove 311 on its top surface; the inner contour shape of the support groove 311 is designed to conform to the external features of the fixing kit (such as the operating pull ring or protruding structure). When the fusion tube assembly 10 falls into the groove, the side wall of the support groove 311 forms a shape fit with the outer wall of the fixing kit, thereby forming a circumferential limit on the fixing kit. This limiting effect locks the circumferential posture of the fusion tube assembly 10, forcing the pre-machined locking hole on the fixing kit to face vertically upward, accurately aligning with the preset pin insertion path.

[0045] The pin insertion mechanism 33, in conjunction with the support and positioning assembly, is positioned above the support bracket 31. This mechanism includes two independent pin insertion sections, respectively located at both ends of the fusion tube assembly 10. Each pin insertion section typically includes a vertically mounted press-fit cylinder or hydraulic cylinder, with a pressure head at its output end located on the extension line of the insertion path. During operation, the two pin insertion sections are configured to operate synchronously, driving two locking pins 104 to be simultaneously pressed vertically downwards along the insertion path into the locking holes at both ends. This dual-end synchronous pressure application method not only improves assembly efficiency but, more importantly, balances the axial load applied to the fusion tube cylinder 101.

[0046] To accommodate fusion tube assemblies 10 of different lengths, the locking pin insertion unit 3 is also equipped with a spacing adjustment component. This component, mounted on the support platform 11, mainly includes a linear guide rail 321 extending along the arrangement direction of the two support supports 31 and a drive screw 322. In this embodiment, one support support 31 is fixedly mounted on the support platform 11, while the other support support 31 is constructed as a movable seat, with a slider at its bottom that slides on the linear guide rail 321. The drive screw 322 is connected to the movable seat via a drive mechanism. By rotating a handwheel or using a motor to drive the screw 322, the movable seat can be moved reciprocally along the linear guide rail 321, thereby achieving stepless adjustment of the relative spacing between the pair of support supports 31.

[0047] Based on the hardware architecture of the above-mentioned fusion tube assembly equipment 10, this embodiment further proposes an assembly process method based on the equipment. The core logic of this process method lies in utilizing the rigid limiting and pressure holding functions of the equipment to combine "step-by-step independent depth determination" with "in-situ hole forming". The specific operation process is as follows.

[0048] First, step S1 is performed, namely the assembly and temporary holding of the first end of the melt tube 101. In the first fastening kit assembly unit 2 located upstream of the flow path, the operator places the first fastening kit 102 into the positioning cavity 211 of the positioning module 21, using the bottom surface of the positioning cavity 211 to define the axial zero point. Then, the fixed-depth clamping mechanism 22 is activated, and the pressure applying part 221 clamps the end of the melt tube 101 away from the first fastening kit 102 and drives it vertically downward, forcibly pressing the first end of the melt tube 101 into the inner cavity of the first fastening kit 102. During this process, the driving part 222 continues to apply pressure until the end face of the melt tube 101 and the inner bottom wall of the first fastening kit 102 axially rigidly abut against each other, thereby eliminating all assembly gaps at the first end and establishing a first axial pre-tightening state. Next, under the pressure-holding condition where the pressure-applying part 221 maintains the first axial pre-tightening state, the lateral drilling mechanism 23 is activated. Guided by the pre-set radially opposing through-hole on the side wall of the first fixing kit 102, it directly cuts the side wall area of ​​the melt tube 101 exposed in the hole to form a head-end locking hole. After drilling is completed, the drill bit 231 retracts and the pressure-applying part 221 is released. At this time, the radial clamping force generated by the interference or tight fit between the melt tube 101 and the first fixing kit 102 forms a head-end temporary fixing connection that can maintain the aforementioned first axial pre-tightening state.

[0049] Step S2 is then executed, which involves the assembly, phase calibration, and temporary holding of the tail end of the melt tube body 101. The semi-finished product with the first end assembly completed is transferred to the downstream second fastening kit assembly unit 2, and the second fastening kit 103 is placed into the positioning module 21 of this unit. The pressure part 221 clamps the melt tube body 101 again (at this time, the clamping part is the assembled first fastening kit 102 or the adjacent area) and drives it to press downward into the second fastening kit 103. In this step, establishing phase constraint is crucial: on the movement path that establishes a second axial pre-tightening state at the second end of the melt tube body 101, that is, before the melt tube body 101 is completely pressed against the second fastening kit 103, the phase positioning member 7 on the equipment plays a role, and its reference abutment surface 71 applies a linear guiding constraint to the outwardly protruding operating part (such as the pull ring sidewall) of the first fastening kit 102. By means of this linear guiding constraint, the circumferential orientation of the melt tube cylinder 101 is forcibly locked during the press-fitting process, thereby ensuring that the tail-end locking hole to be processed and the head-end locking hole maintain a preset angular phase consistency. Subsequently, the pressure applying part 221 continues to press down until the second end of the melt tube cylinder 101 and the second fixing kit 103 axially rigidly abut against each other, establishing a second axial pre-tightening state; and in the pressure holding state, the drilling mechanism 23 uses the hole position of the second fixing kit 103 as a guide to complete the processing of the tail-end locking hole, forming a temporary tail-end fixing connection that maintains the second axial pre-tightening state.

[0050] Finally, step S3 is executed, namely the implantation of the double-ended synchronous locking pins 104. The fusible tube assembly 10, with temporary holding connections at both ends and the phase matching qualified, is transferred to the locking pin implantation unit 3 and placed on a pair of support brackets 31. The support brackets 31 automatically align the posture of the fusible tube assembly 10 using shape matching, so that the locking holes at both ends are vertically upward and aligned with the implantation path. At this time, with both the first and last temporary holding connections maintained (i.e., the axial preload is not released), the pin implantation mechanism 33 is activated, controlling the two sets of pin implantation parts to simultaneously apply mechanical thrust to the locking pins 104 located above the first and last locking holes. Through this synchronous pressing operation, two locking pins 104 are pressed into the corresponding locking holes and locking grooves 106 at the same time, transforming the temporary holding connection between the fixing kit and the fuse tube body 101, which originally relied on friction and interference fit, into a permanent mechanical interlock based on the pin's shear resistance. Thus, under the condition of solidified axial high preload and precise phase relationship, the final assembly of the first fixing kit 102 and the second fixing kit 103 at both ends of the fuse tube assembly 10 is completed.

[0051] After the locking pin 104 is inserted, the fuse tube assembly 10 continues to flow to the lower rotating shaft seat forming unit 4 and the lower rotating shaft seat assembly unit 5. In this stage, the equipment completes the final forming process of the lower rotating shaft seat in sequence, and connects the lower rotating shaft seat to the second fixing kit 103 by means of a pin, thereby assembling a complete drop-out fuse tube assembly 10 and removing it from the production line.

[0052] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fusion tube assembly equipment, characterized in that, include: A frame and a support platform mounted on the frame; two fastening kit assembly units, sequentially arranged on the support platform along the flow path of the molten tube assembly, for sequentially assembling the fastening kits at both ends of the molten tube cylinder; each of the two fastening kit assembly units includes: a positioning module, having a positioning cavity for accommodating the corresponding fastening kit, the positioning cavity being configured to constrain the radial degree of freedom of the fastening kit and define an axial assembly limiting reference relative to the fastening kit; a fixed-depth clamping mechanism, including a pressure applying part spaced axially relative to the positioning module, the pressure applying part... The pressure section is configured to coaxially hold the end of the molten tube cylinder away from the positioning module and drive the molten tube cylinder to be inserted axially into the fixing kit until the molten tube cylinder forms a rigid stop with the axial assembly limit reference, thereby establishing a constant assembly preload, and the pressure section maintains the axial pressure holding state; the drilling mechanism, located to the side of the positioning module, is configured to drill a locking hole in the side wall of the molten tube cylinder under the condition that the pressure section maintains the axial pressure holding state, guided by a preset hole position on the fixing kit.

2. The fusion tube assembly equipment according to claim 1, characterized in that, It also includes a negative pressure chip suction assembly, which includes a chip suction hood, a negative pressure channel, and a negative pressure source. The chip suction hood is arranged laterally to the positioning module and adjacent to the drilling area of ​​the drilling mechanism, and the chip suction hood has an intake port facing a preset hole position of the fixing kit. One end of the negative pressure channel is connected to the intake port, and the other end is connected to the negative pressure source, so as to form a negative pressure airflow at the intake port to suck up drilling chips when the drilling mechanism performs drilling.

3. The fusion tube assembly equipment according to claim 2, characterized in that, The fixed assembly unit also includes a protective baffle plate erected on the support platform; the protective baffle plate surrounds the outer periphery of the positioning module to divide the area where the positioning module is located into an inner operating position on one side of the positioning module and an outer operating position on the side of the operator; the dust suction hood of the negative pressure dust suction assembly is located in the inner operating position of the protective baffle plate.

4. The fusion tube assembly equipment according to claim 1, characterized in that, The fixed fitting assembly unit located downstream of the flow path along the assembly of the melt tube assembly in the two fixed fitting assembly units is also provided with a phase positioning component. The phase positioning component is located on the outside of the positioning cavity of the positioning module and has a reference abutment surface extending along the axial direction of the melt tube body. The reference abutment surface is used to abut against the side wall of the protruding operating part of the fixed fitting that has been assembled on the first end of the melt tube body, so as to restrict the circumferential rotational freedom of the melt tube body about its axis, thereby so that the fixed fitting at the second end and the fixed fitting at the first end maintain a preset angular assembly position relationship during assembly.

5. The fusion tube assembly equipment according to claim 4, characterized in that, The fixed-depth clamping mechanism further includes a drive unit, a guide column, and a lifting support seat slidably disposed on the guide column; the power output end of the drive unit is connected to the lifting support seat and is configured to drive the lifting support seat to perform axial lifting motion along the guide column; the pressure application unit is fixedly disposed at the bottom of the lifting support seat, and the phase positioning member is also fixedly connected to the lifting support seat so that the phase positioning member moves synchronously with the pressure application unit.

6. The fusion tube assembly equipment according to any one of claims 1 to 5, characterized in that, It also includes a locking pin insertion unit located downstream of the two fastening kit assembly units along the flow path of the fusion tube assembly. The locking pin insertion unit includes: a support and positioning component, including a pair of support supports disposed on the support platform, the pair of support supports being provided with a preset distance between them for supporting the fastening kits at both ends of the fusion tube assembly respectively, the support supports being provided with support grooves for forming a circumferential limit on the fastening kits to lock the circumferential posture of the fusion tube assembly, thereby causing the locking holes on the fastening kits to face the preset insertion path; and a pin insertion mechanism, including a pin insertion part, the pin insertion part being disposed corresponding to the insertion path for pressing the pin into the locking hole along the insertion path.

7. The fusion tube assembly equipment according to claim 6, characterized in that, The locking pin insertion unit further includes a spacing adjustment component disposed on the support platform. The spacing adjustment component includes a linear guide rail extending along the arrangement direction of the two support supports and a drive screw. At least one of the pair of support supports is configured as a movable seat slidably disposed on the linear guide rail. The drive screw is induced to be connected to the movable seat. The drive screw is configured to drive the movable seat to reciprocate along the linear guide rail to adjust the relative spacing between the pair of support supports.

8. A method for assembling a fusible tube assembly, characterized in that, Includes the following steps: S1. Press the first end of the fusion tube into the first fastening assembly until they are axially rigidly opposed, thereby establishing a first axial preload state to eliminate assembly gaps; while maintaining the first axial preload state, using the pre-set radially opposing through hole on the side wall of the first fastening assembly as a guide, drill a hole in the side wall area of ​​the fusion tube exposed in the hole to form a head-end locking hole, and form a temporary head-end holding connection that can maintain the first axial preload state by the radial clamping force generated by the press fit between the fusion tube and the first fastening assembly; S2. With the temporary head-end holding connection maintained, press the second end of the fusion tube into the second fastening assembly until they are axially rigidly opposed. The first end is stopped, thereby establishing a second axial preload state that eliminates assembly gaps; while maintaining the second axial preload state, the side wall area of ​​the molten tube exposed in the hole is drilled with the radially opposite through hole on the side wall of the second fastening kit as a guide to form a tail end locking hole, and the radial clamping force generated by the press fit between the molten tube and the second fastening kit forms a tail end temporary holding connection that can maintain the second axial preload state; S3, with both the first end temporary holding connection and the tail end temporary holding connection maintained, the locking pin is pressed into the first end locking hole and the tail end locking hole to establish a rigid interlock between the fastening kit and the molten tube.

9. The assembly process method for the fusible tube assembly according to claim 8, characterized in that, In step S2, on the moving path of the melt tube body to establish the second axial pre-tightening state, a linear guiding constraint is applied to the outer contour of the first fixing kit, and before the second fixing kit is pressed into the second end of the melt tube body, the circumferential posture of the melt tube body is locked by the linear guiding constraint, so that the first end locking hole and the tail end locking hole maintain a preset angular phase consistency; in step S3, a mechanical thrust is simultaneously applied to the locking pins at the first end locking hole and the tail end locking hole to synchronously establish a rigid interlock between the fixing kit and the melt tube body at both ends.

10. A fusible tube assembly, characterized in that, Assembled using the fusion tube assembly equipment as described in any one of claims 1 to 7, and / or assembled according to the assembly process method as described in claim 8 or 9; comprising a fusion tube cylinder, a first fixing kit and a second fixing kit respectively sleeved at both ends of the fusion tube cylinder, and locking pins; the side walls of the first fixing kit and the second fixing kit are each provided with through pin holes; the side walls of the fusion tube cylinder, which are accommodated within the first fixing kit and the second fixing kit, are provided with locking grooves corresponding to the positions of the pin holes; the locking pins pass through the pin holes and are pressed into the locking grooves to fix the first fixing kit and the second fixing kit to both ends of the fusion tube cylinder.

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